US6046896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
DC-to-DC converter capable of preventing overvoltage
Assignee: Fujitsu Ltd
•
Filing: 1996-08-09
•
Granted: 2000-04-04
•
Expires: 2016-08-09
Abstract
Abstract To avoid burning out a capacitor in a synchronous rectification type DC-to-DC converter due to overvoltages, the synchronous rectification type DC-to-DC converter includes a storage unit storing therein power derived from a power supply, switching elements connecting and disconnecting respective signal paths from power and ground, and a control unit controlling the connecting/disconnecting operations of the switching elements to maintain a voltage output from the storage unit at a predetermined value. The DC/DC converter also includes an overvoltage detecting unit monitoring a voltage derived from the power supply to thereby output an alarm signal when the voltage derived from the power supply exceeds a preselected voltage value, a shortcircuiting unit influencing the connecting conditions of the switching elements when the alarm signal from the overvoltage detecting unit is input therein, whereby the voltage derived from the power supply is shortcircuited, and an interrupting unit interrupting one of the signal paths by the power shortcircuited by the shortcircuiting unit.
Inventors
- 👤 Mitsuo Saeki
- 👤 Hidetoshi Yano
- 👤 Hidekiyo Ozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:07
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/10; H02H7/12; H02H7/1213; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; H02M3/158; H02M3/1588; H02H7/16; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 80
Claim 1
Independent Claim
185 words
A synchronous rectification type DC/DC converter comprising: a storage unit storing therein power derived from a power supply; a first switch element, provided between said power supply and said storage unit, connecting/disconnecting the storage unit to/from the power supply; a second switch element, provided between the ground and a connecting point of said first switch and said storage unit, connecting/disconnecting said connecting point to/from the ground; a control unit controlling the connecting/disconnecting operations of said first switch element and said second switch element so as to maintain a voltage outputted from said storage unit at a predetermined value; an overvoltage detecting unit monitoring an input voltage derived from said power supply and outputting a signal when said input voltage derived from said power supply exceeds a preselected voltage value; a shortcircuiting unit bringing said first switch element and said second switch element to connecting conditions when the signal from the overvoltage detecting unit is inputted therein, whereby the voltage derived from said power supply is shortcircuited; and an interrupting unit interrupting input power of said power supply by the power shortcircuited by said shortcircuiting unit.
Claim 2
Dependent Claim
185 words
A synchronous rectification type DC/DC converter comprising: a storage unit storing therein power derived from a power supply; a first switch element, provided between said power supply and said storage unit, connecting/disconnecting the storage unit to/from the power supply; a second switch element, provided between the ground and a connecting point of said first switch and said storage unit, connecting/disconnecting said connecting point to/from the ground; a control unit controlling the connecting/disconnecting operations of said first switch element and said second switch element so as to maintain a voltage outputted from said storage unit at a predetermined value; an overvoltage detecting unit monitoring an input voltage derived from said power supply and outputting a signal when said input voltage derived from said power supply exceeds a preselected voltage value; a shortcircuiting unit bringing said first switch element and said second switch element to connecting conditions when the signal from the overvoltage detecting unit is inputted therein, whereby the voltage derived from said power supply is shortcircuited; and an interrupting unit interrupting input power of said power supply by the power shortcircuited by said shortcircuiting unit.
Claim 3
Dependent Claim
59 words
The DC/DC converter as claimed in claim 1 wherein, said overvoltage detecting unit comprises: a reference voltage producing unit producing a reference voltage, and a comparing unit comparing said reference voltage with the input voltage derived from said power supply and outputting the signal when said input voltage derived from said power supply is higher than said reference voltage.
Claim 4
Dependent Claim
27 words
The DC/DC converter as claimed in claim 1 wherein: said interrupting unit is a fuse to be melted down by the power shortcircuited by said shortcircuiting unit.
Claim 5
Dependent Claim
126 words
A DC/DC converter, comprising: a storage unit storing power from a power supply; a first switch, provided between said power supply and said storage unit, connecting/disconnecting the storage unit to/from the power supply; a second switch, provided between the ground and said connecting point of said first switch and said storage unit, connecting/disconnecting a connecting point to/from the ground; a control unit controlling said first switch and said second switch so as to maintain a voltage outputted from said storage unit at a predetermined value; a detecting unit detecting whether an input voltage of said power supply exceeds a predetermined voltage value; and a shortcircuiting unit connecting said first switch and said second switch in accordance with said detecting unit, whereby said power supply is shortcircuited.
Claim 6
Dependent Claim
126 words
A DC/DC converter, comprising: a storage unit storing power from a power supply; a first switch, provided between said power supply and said storage unit, connecting/disconnecting the storage unit to/from the power supply; a second switch, provided between the ground and said connecting point of said first switch and said storage unit, connecting/disconnecting a connecting point to/from the ground; a control unit controlling said first switch and said second switch so as to maintain a voltage outputted from said storage unit at a predetermined value; a detecting unit detecting whether an input voltage of said power supply exceeds a predetermined voltage value; and a shortcircuiting unit connecting said first switch and said second switch in accordance with said detecting unit, whereby said power supply is shortcircuited.
Claim 7
Dependent Claim
28 words
The DC/DC converter as claimed in claim 4, further comprising: an interrupting unit interrupting input power of said power supply by the power shortcircuited by said shortcircuiting unit.
Claim 8
Dependent Claim
56 words
The DC/DC converter as claimed in claim 4, wherein: said detecting unit comprises: a reference voltage producing unit producing a reference voltage, and a comparing unit comparing said reference voltage with the input voltage of said power supply and outputting a signal when said input voltage from said power supply is higher than said reference voltage.
Claim 9
Dependent Claim
15 words
The DC/DC converter as claimed in claim 5, wherein said interrupting unit is a fuse.
Claim 10
Dependent Claim
56 words
The DC/DC converter as claimed in claim 5, wherein: said detecting unit comprises: a reference voltage producing unit producing a reference voltage, and a comparing unit comparing said reference voltage with the input voltage of said power supply and outputting a signal when said input voltage from said power supply is higher than said reference voltage.
Claim 11
Dependent Claim
61 words
A synchronous rectification type DC/DC converter comprising: a main switch; a synchronous rectification switch; an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting control signals to turn ON both the main switch and the synchronous rectification switch when an overvoltage is detected by the overvoltage detecting unit.
Claim 12
Dependent Claim
61 words
A synchronous rectification type DC/DC converter comprising: a main switch; a synchronous rectification switch; an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting control signals to turn ON both the main switch and the synchronous rectification switch when an overvoltage is detected by the overvoltage detecting unit.
Claim 13
Dependent Claim
32 words
The synchronous rectification type DC/DC converter as claimed in claim 9, further comprising: an inductor connected to said main switch; and a capacitor connected to said inductor smoothing output of said inductor.
Claim 14
Dependent Claim
30 words
The synchronous rectification type DC/DC converter as claimed in claim 9, further comprising: an interrupting unit interrupting power supply to the DC/DC converter, thereby stopping input of the supply power.
Claim 15
Dependent Claim
42 words
The synchronous rectification type DC/DC converter as claimed in claims 9, wherein the control unit includes an interrupting unit interrupting power supply to the DC/DC converter by utilizing current produced when both the main switch and the synchronous rectification switch turn ON.
Claim 16
Dependent Claim
39 words
The synchronous rectification type DC/DC converter as claimed in claim 9, wherein said overvoltage detecting unit outputs a detecting signal when said overvoltage detecting unit detects the overvoltage of the input voltage of the synchronous rectification type DC/DC converter.
Claim 17
Dependent Claim
54 words
The synchronous rectification type DC/DC converter as claimed in claim 13, wherein the control unit includes a memory circuit storing the detecting signal outputted from the overvoltage detecting unit, and said memory circuit outputs a control signal turning ON both the main switch and the synchronous rectification switch, when the detecting signal is inputted.
Claim 18
Dependent Claim
63 words
The synchronous rectification type DC/DC converter as claimed in claim 12, further comprising: an emergency power supply circuit supplying a drive power to the main switch and the synchronous rectification switch from the time when the main switch and the synchronous rectification switch are turned ON until the time when the power supply to the DC/DC converter is interrupted by the interrupting unit.
Claim 19
Dependent Claim
46 words
The synchronous rectification type DC/DC converter as claimed in claim 9, further comprising: a feedback unit effecting feedback control of the main switch and the synchronous rectification switch in order to maintain an output voltage of the synchronous rectification type DC/DC converter at a constant value.
Claim 20
Dependent Claim
56 words
A synchronous rectification type DC/DC converter comprising: a main switch; a synchronous rectification switch; an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit turning the main switch and the synchronous rectification switch ON when the overvoltage is detected by the overvoltage detecting unit.
Claim 21
Dependent Claim
56 words
A synchronous rectification type DC/DC converter comprising: a main switch; a synchronous rectification switch; an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit turning the main switch and the synchronous rectification switch ON when the overvoltage is detected by the overvoltage detecting unit.
Claim 22
Dependent Claim
74 words
A control circuit for synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, thereby to effect a synchronous rectification type DC/DC conversion, comprising: an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting control signals to turn ON the main switch and the synchronous rectification switch when an overvoltage is detected by the overvoltage detecting unit.
Claim 23
Dependent Claim
74 words
A control circuit for synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, thereby to effect a synchronous rectification type DC/DC conversion, comprising: an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting control signals to turn ON the main switch and the synchronous rectification switch when an overvoltage is detected by the overvoltage detecting unit.
Claim 24
Dependent Claim
34 words
The control circuit for a synchronous rectification type DC/DC converter as claimed in claim 18, wherein the main switch and the synchronous rectification switch, when turned ON, shortcircuits an input from the power supply.
Claim 25
Dependent Claim
69 words
The control circuit for a synchronous rectification type DC/DC converter as claimed in claim 18, wherein the synchronous rectification type DC/DC converter has an interrupting unit interrupting the power supply, the control unit shortcircuits an input from a power supply by said control signals, and the interrupting unit interrupts a power supply to the DC/DC converter by utilizing current produced when the input from the power supply is shortcircuited.
Claim 26
Dependent Claim
64 words
The control circuit for a synchronous rectification type DC/DC converter as claimed in claim 20, further comprising: an emergency power supply circuit supplying a drive power to the main switch and the synchronous rectification switch from the time when the main switch and the synchronous rectification switch are turned ON until the power supply to the DC/DC converter is interrupted by the interrupting unit.
Claim 27
Dependent Claim
43 words
The control circuit for a synchronous rectification type DC/DC converter as claimed in claim 18, wherein said overvoltage detecting unit outputs a detecting signal when said overvoltage detecting unit detects the overvoltage of the input voltage of the synchronous rectification type DC/DC converter.
Claim 28
Dependent Claim
53 words
The control circuit for a synchronous rectification type DC/DC converter as claimed in claim 22, wherein the control unit has a memory circuit which stores the detecting signal and said memory circuit outputs control signals to turn ON both the synchronous rectification switch and the main switch, when the detecting signal is inputted.
Claim 29
Dependent Claim
50 words
The control circuit for a synchronous rectification type DC/DC converter as claimed in claim 18, further comprising: a feedback unit effecting feedback control of the main switch and the synchronous rectification switch in order to maintain an output voltage of the synchronous rectification type DC/DC converter at a constant value.
Claim 30
Dependent Claim
93 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, thereby to effect a synchronous rectification type DC/DC conversion, comprising: an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting control signals to turn ON the main switch and the synchronous rectification switch when an overvoltage is detected by the overvoltage detecting unit.
Claim 31
Dependent Claim
93 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, thereby to effect a synchronous rectification type DC/DC conversion, comprising: an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting control signals to turn ON the main switch and the synchronous rectification switch when an overvoltage is detected by the overvoltage detecting unit.
Claim 32
Dependent Claim
75 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, thereby to effect a synchronous rectification type DC/DC conversion, comprising: an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting control signals to turn ON the main switch and the synchronous rectification switch when an overvoltage is detected by the overvoltage detecting unit.
Claim 33
Dependent Claim
75 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, thereby to effect a synchronous rectification type DC/DC conversion, comprising: an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting control signals to turn ON the main switch and the synchronous rectification switch when an overvoltage is detected by the overvoltage detecting unit.
Claim 34
Dependent Claim
92 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch, a synchronous switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, thereby to effect a synchronous rectification type DC/DC conversion, comprising: an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting control signals to turn ON the main switch and the synchronous rectification switch when an overvoltage is detected by the overvoltage detecting unit.
Claim 35
Dependent Claim
92 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch, a synchronous switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, thereby to effect a synchronous rectification type DC/DC conversion, comprising: an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting control signals to turn ON the main switch and the synchronous rectification switch when an overvoltage is detected by the overvoltage detecting unit.
Claim 36
Dependent Claim
69 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, comprising: a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit outputting control signals to turn ON the main switch and the synchronous rectification switch, when the stop signal is received by the receiving unit.
Claim 37
Dependent Claim
69 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, comprising: a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit outputting control signals to turn ON the main switch and the synchronous rectification switch, when the stop signal is received by the receiving unit.
Claim 38
Dependent Claim
35 words
The control circuit for a synchronous rectification type DC/DC converter as claimed in claim 28, wherein said stop signal informs that an input voltage of the synchronous rectification type DC/DC converter exceeds the predetermined threshold.
Claim 39
Dependent Claim
34 words
The control circuit for a synchronous rectification type DC/DC converter as claimed in claim 28, wherein the main switch and the synchronous rectification switch, when turned ON, shortcircuits an input from the power supply.
Claim 40
Dependent Claim
69 words
The control circuit for a synchronous rectification type DC/DC converter as claimed in claim 28, wherein the synchronous rectification type DC/DC converter has an interrupting unit interrupting the power supply, the control unit shortcircuits an input from a power supply by said control signals, and the interrupting unit interrupts a power supply to the DC/DC converter by utilizing current produced when the input from the power supply is shortcircuited.
Claim 41
Dependent Claim
64 words
The control circuit for a synchronous rectification type DC/DC converter as claimed in claim 31, further comprising: an emergency power supply circuit supplying a drive power to the synchronous rectification switch and the main switch from the time when the main switch and the synchronous rectification switch are turned ON until the power input to the DC/DC converter is interrupted by the interrupting unit.
Claim 42
Dependent Claim
50 words
The control circuit for a synchronous rectification type DC/DC converter as claimed in claim 28, further comprising: a feedback unit effecting feedback control of the main switch and the synchronous rectification switch in order to maintain an output voltage of the synchronous rectification type DC/DC converter at a constant value.
Claim 43
Dependent Claim
96 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, thereby to effect a synchronous rectification type DC/DC conversion, comprising: a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit outputting control signals to turn ON the main switch and the synchronous rectification switch, when the stop signal is received by the received unit.
Claim 44
Dependent Claim
96 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, thereby to effect a synchronous rectification type DC/DC conversion, comprising: a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit outputting control signals to turn ON the main switch and the synchronous rectification switch, when the stop signal is received by the received unit.
Claim 45
Dependent Claim
66 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, comprising: a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit turning both the main switch and the synchronous rectification switch ON, when the stop signal is received by the receiving unit.
Claim 46
Dependent Claim
66 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, comprising: a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit turning both the main switch and the synchronous rectification switch ON, when the stop signal is received by the receiving unit.
Claim 47
Dependent Claim
94 words
A control unit for a synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor for smoothing output of said inductor, thereby to effect a synchronous rectification type DC/DC conversion, comprising: a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit turning both the main switch and the synchronous rectification switch ON, when the stop signal is received by the receiving unit.
Claim 48
Dependent Claim
94 words
A control unit for a synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor for smoothing output of said inductor, thereby to effect a synchronous rectification type DC/DC conversion, comprising: a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit turning both the main switch and the synchronous rectification switch ON, when the stop signal is received by the receiving unit.
Claim 49
Dependent Claim
77 words
A control circuit for controlling a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch comprising: a voltage input terminal inputting therein an input voltage of a DC/DC conversion process; an overvoltage detecting unit outputting a detecting signal when the input voltage inputted into the voltage input terminal exceeds a predetermined value; and a control unit turning ON the main switch and the synchronous rectification switch in response to the detecting signal.
Claim 50
Dependent Claim
77 words
A control circuit for controlling a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch comprising: a voltage input terminal inputting therein an input voltage of a DC/DC conversion process; an overvoltage detecting unit outputting a detecting signal when the input voltage inputted into the voltage input terminal exceeds a predetermined value; and a control unit turning ON the main switch and the synchronous rectification switch in response to the detecting signal.
Claim 51
Dependent Claim
180 words
A synchronous rectification type DC/DC converter comprising: a storage unit storing therein power derived from a power supply; a first switch element provided between said power supply and said storage unit connecting/disconnecting said storage unit to/from the power supply; a second switch element, provided between ground and a connecting point of said first switch element and said storage unit, connecting/disconnecting said connecting point to/from the ground; a control unit controlling the connecting/disconnecting operations of said first switch element and said second switch element so as to maintain a voltage outputted from said storage unit at a predetermined value; an overvoltage detecting unit monitoring an input voltage derived from said power supply and outputting a signal when said input voltage derived from said power supply exceeds a preselected voltage value; a shortcircuiting unit bringing said second switch element to connecting conditions when the signal from said overvoltage detecting unit is inputted therein, whereby the voltage derived from said power supply is shortcircuited; and an interrupting unit interrupting input power of said power supply by the power shortcircuited by said shortcircuited unit.
Claim 52
Dependent Claim
180 words
A synchronous rectification type DC/DC converter comprising: a storage unit storing therein power derived from a power supply; a first switch element provided between said power supply and said storage unit connecting/disconnecting said storage unit to/from the power supply; a second switch element, provided between ground and a connecting point of said first switch element and said storage unit, connecting/disconnecting said connecting point to/from the ground; a control unit controlling the connecting/disconnecting operations of said first switch element and said second switch element so as to maintain a voltage outputted from said storage unit at a predetermined value; an overvoltage detecting unit monitoring an input voltage derived from said power supply and outputting a signal when said input voltage derived from said power supply exceeds a preselected voltage value; a shortcircuiting unit bringing said second switch element to connecting conditions when the signal from said overvoltage detecting unit is inputted therein, whereby the voltage derived from said power supply is shortcircuited; and an interrupting unit interrupting input power of said power supply by the power shortcircuited by said shortcircuited unit.
Claim 53
Dependent Claim
125 words
A DC/DC converter comprising: a storage unit storing power from a power supply; a first switch provided between said power supply and said storage unit, connecting/disconnecting said storage unit to/from the power supply; a second switch provided between ground and said connecting point of said first switch and said storage unit connecting/disconnecting a connecting point to/from the ground; a control unit controlling said first switch and said second switch so as to maintain a voltage outputted from said storage unit at a predetermined value; a detecting unit detecting whether an input voltage of said power supply exceeds a predetermined voltage value; and a shortcircuiting unit bringing said second switch to a connecting condition in accordance with said detecting unit, whereby said power supply is shortcircuited.
Claim 54
Dependent Claim
125 words
A DC/DC converter comprising: a storage unit storing power from a power supply; a first switch provided between said power supply and said storage unit, connecting/disconnecting said storage unit to/from the power supply; a second switch provided between ground and said connecting point of said first switch and said storage unit connecting/disconnecting a connecting point to/from the ground; a control unit controlling said first switch and said second switch so as to maintain a voltage outputted from said storage unit at a predetermined value; a detecting unit detecting whether an input voltage of said power supply exceeds a predetermined voltage value; and a shortcircuiting unit bringing said second switch to a connecting condition in accordance with said detecting unit, whereby said power supply is shortcircuited.
Claim 55
Dependent Claim
56 words
A synchronous rectification type DC/DC converter comprising: a main switch; a synchronous rectification switch; an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting control signals to turn ON said synchronous rectification switch when an overvoltage is detected by said overvoltage detecting unit.
Claim 56
Dependent Claim
56 words
A synchronous rectification type DC/DC converter comprising: a main switch; a synchronous rectification switch; an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting control signals to turn ON said synchronous rectification switch when an overvoltage is detected by said overvoltage detecting unit.
Claim 57
Dependent Claim
52 words
A synchronous rectification type DC/DC converter comprising; a main switch; a synchronous rectification switch; an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit turning said synchronous rectification switch ON when an overvoltage is detected by said overvoltage detecting unit.
Claim 58
Dependent Claim
52 words
A synchronous rectification type DC/DC converter comprising; a main switch; a synchronous rectification switch; an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit turning said synchronous rectification switch ON when an overvoltage is detected by said overvoltage detecting unit.
Claim 59
Dependent Claim
71 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, to effect a synchronous rectification type DC/DC conversion, comprising: an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting a control signal to turn ON the synchronous rectification switch when an overvoltage is detected by said overvoltage detecting unit.
Claim 60
Dependent Claim
71 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, to effect a synchronous rectification type DC/DC conversion, comprising: an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting a control signal to turn ON the synchronous rectification switch when an overvoltage is detected by said overvoltage detecting unit.
Claim 61
Dependent Claim
88 words
A control circuit for synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, to effect a synchronous rectification type DC/DC conversion, comprising: an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting a control signal to turn ON the synchronous rectification switch when an overvoltage is detected by said overvoltage detecting unit.
Claim 62
Dependent Claim
88 words
A control circuit for synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, to effect a synchronous rectification type DC/DC conversion, comprising: an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting a control signal to turn ON the synchronous rectification switch when an overvoltage is detected by said overvoltage detecting unit.
Claim 63
Dependent Claim
66 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, to effect a synchronous rectification type DC/DC conversion, comprising; an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit turning the synchronous rectification switch ON when an overvoltage is detected by said overvoltage detecting unit.
Claim 64
Dependent Claim
66 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, to effect a synchronous rectification type DC/DC conversion, comprising; an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit turning the synchronous rectification switch ON when an overvoltage is detected by said overvoltage detecting unit.
Claim 65
Dependent Claim
84 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, to effect a synchronous rectification type DC/DC conversion, comprising: an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit turning the synchronous rectification switch ON when an overvoltage is detected by said overvoltage detecting unit.
Claim 66
Dependent Claim
84 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, to effect a synchronous rectification type DC/DC conversion, comprising: an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit turning the synchronous rectification switch ON when an overvoltage is detected by said overvoltage detecting unit.
Claim 67
Dependent Claim
64 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, comprising: a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; a control unit outputting control signals to turn ON the synchronous rectification switch when the stop signal is received by said receiving unit.
Claim 68
Dependent Claim
64 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, comprising: a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; a control unit outputting control signals to turn ON the synchronous rectification switch when the stop signal is received by said receiving unit.
Claim 69
Dependent Claim
92 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, thereby to effect a synchronous rectification type DC/DC conversion, comprising; a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit outputting control signals to turn ON the synchronous rectification switch when the stop signal is received by said receiving unit.
Claim 70
Dependent Claim
92 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, thereby to effect a synchronous rectification type DC/DC conversion, comprising; a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit outputting control signals to turn ON the synchronous rectification switch when the stop signal is received by said receiving unit.
Claim 71
Dependent Claim
60 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, comprising: a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit switching the synchronous rectification switch when the stop signal is received by said receiving unit.
Claim 72
Dependent Claim
60 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, comprising: a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit switching the synchronous rectification switch when the stop signal is received by said receiving unit.
Claim 73
Dependent Claim
87 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, to effect a synchronous rectification type DC/DC conversion, comprising; a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit turning the synchronous rectification switch ON when the stop signal is received by said receiving unit.
Claim 74
Dependent Claim
87 words
A control circuit for a synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, to effect a synchronous rectification type DC/DC conversion, comprising; a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit turning the synchronous rectification switch ON when the stop signal is received by said receiving unit.
Claim 75
Dependent Claim
77 words
A control circuit for controlling a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, comprising; a voltage input terminal inputting therein an input voltage of a DC/DC conversion process; an overvoltage detecting unit outputting a detecting signal when the input voltage inputted into the voltage input terminal exceeds a predetermined value; and a control unit turning ON the synchronous rectification switch when the stop signal is received by said receiving unit.
Claim 76
Dependent Claim
77 words
A control circuit for controlling a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, comprising; a voltage input terminal inputting therein an input voltage of a DC/DC conversion process; an overvoltage detecting unit outputting a detecting signal when the input voltage inputted into the voltage input terminal exceeds a predetermined value; and a control unit turning ON the synchronous rectification switch when the stop signal is received by said receiving unit.
Claim 77
Dependent Claim
53 words
A control method for a synchronous rectification type DC/DC converter having an input, a main switch and a synchronous rectification switch, comprising: outputting a detecting signal when a voltage across the input exceeds a predetermined value; and turning on the main switch and the synchronous rectification switch in response to the detecting signal.
Claim 78
Dependent Claim
53 words
A control method for a synchronous rectification type DC/DC converter having an input, a main switch and a synchronous rectification switch, comprising: outputting a detecting signal when a voltage across the input exceeds a predetermined value; and turning on the main switch and the synchronous rectification switch in response to the detecting signal.
Claim 79
Dependent Claim
44 words
A control method for a synchronous rectification type DC/DC converter having an input and a synchronous rectification switch, comprising: detecting an overvoltage across the input of the synchronous rectification type DC/DC converter; and turning on the synchronous rectification switch when an overvoltage is detected.
Claim 80
Dependent Claim
44 words
A control method for a synchronous rectification type DC/DC converter having an input and a synchronous rectification switch, comprising: detecting an overvoltage across the input of the synchronous rectification type DC/DC converter; and turning on the synchronous rectification switch when an overvoltage is detected.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-04-04 | 2003-10-04 | 2004-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-04-04 | 2007-10-04 | 2008-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-04-04 | 2011-10-04 | 2012-04-04 | $7700.00 | Window Closed / Lapsed |