US6028755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
DC-to-DC converter capable of preventing overvoltages
Assignee: Fujitsu Ltd
•
Filing: 1999-01-22
•
Granted: 2000-02-22
•
Expires: 2019-01-22
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 10:57
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: 62
Claim 1
Independent Claim
154 words
A synchronous rectification type DC/DC converter comprising: a storage unit storing therein power derived from a power supply; a first switch element connecting/disconnecting said storage unit to/from the power supply; a second switch element provided between said storage unit and the ground connecting/disconnecting said storage unit 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 to a predetermined value; an overvoltage detecting unit monitoring the voltage outputted from said storage unit and outputting a signal when said output voltage exceeds a predetermined voltage value; and a clamping unit bringing said first switch element to a disconnecting state and bringing said second switch element to a connecting state when said signal from said overvoltage detecting unit is inputted therein, whereby the output voltage from said storage unit is clamped to the ground level.
Claim 2
Dependent Claim
154 words
A synchronous rectification type DC/DC converter comprising: a storage unit storing therein power derived from a power supply; a first switch element connecting/disconnecting said storage unit to/from the power supply; a second switch element provided between said storage unit and the ground connecting/disconnecting said storage unit 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 to a predetermined value; an overvoltage detecting unit monitoring the voltage outputted from said storage unit and outputting a signal when said output voltage exceeds a predetermined voltage value; and a clamping unit bringing said first switch element to a disconnecting state and bringing said second switch element to a connecting state when said signal from said overvoltage detecting unit is inputted therein, whereby the output voltage from said storage unit is clamped to the ground level.
Claim 3
Dependent Claim
57 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 voltage comparator comparing said reference voltage with the voltage derived from said storage unit and outputting the signal when said voltage derived from said storage unit is higher than said reference voltage.
Claim 4
Dependent Claim
42 words
The DC/DC converter as claimed in claim 1, further comprising: a shortcircuiting unit bringing said second switch element to a connecting state when said first switch element fails under a shortcircuited state, whereby the voltage derived from said power supply is shortcircuited.
Claim 5
Dependent Claim
29 words
The DC/DC converter as claimed in claim 3 further comprising: an interrupting unit interrupting power of said power supply by the power short circuited by said short circuiting unit.
Claim 6
Dependent Claim
27 words
A DC/DC converter as claimed in claim 4, wherein: said interrupting unit is a fuse to be melted down by the power shortcircuited by said shortcircuiting unit.
Claim 7
Dependent Claim
26 words
The DC/DC converter as claimed in claim 1, further comprising: an interrupting unit, provided between said power and said first switch element, interrupting the power supply.
Claim 8
Dependent Claim
53 words
The DC/DC converter as claimed in claim 6, wherein said clamping unit makes said second switch element to a connecting state when said first switch element fails, whereby the voltage derived from said power supply is shortcircuited, and said interrupting unit interrupts the power supply by the power shortcircuited by said shortcircuiting unit.
Claim 9
Dependent Claim
106 words
A DC/DC converter, comprising: a storage unit storing therein power from a power supply; a first switch connecting/disconnecting said storage unit to/from the power supply; a second switch provided between said storage unit and the ground connecting/disconnecting said storage unit 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 that the voltage outputted from said storage unit exceeds a predetermined voltage value; and a clamping unit making said first switch disconnect and said second switch connect in accordance with said detecting unit.
Claim 10
Dependent Claim
106 words
A DC/DC converter, comprising: a storage unit storing therein power from a power supply; a first switch connecting/disconnecting said storage unit to/from the power supply; a second switch provided between said storage unit and the ground connecting/disconnecting said storage unit 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 that the voltage outputted from said storage unit exceeds a predetermined voltage value; and a clamping unit making said first switch disconnect and said second switch connect in accordance with said detecting unit.
Claim 11
Dependent Claim
63 words
The DC/DC converter as claimed in claim 8, wherein: said detecting unit comprises: a reference voltage producing unit producing a reference voltage, and a voltage comparator comparing said reference voltage produced by said reference voltage producing unit with the voltage derived from said storage unit and outputting a signal when said voltage derived from said storage unit is higher than said reference voltage.
Claim 12
Dependent Claim
39 words
The DC/DC converter as claimed in claim 8, further comprising: a shortcircuiting unit bringing said second switch to a connecting state when said first switch fails under a shortcircuited state, whereby the voltage from said power supply is shortcircuited.
Claim 13
Dependent Claim
17 words
The DC/DC converter as claimed in claim 10, further comprising: an interrupting unit interrupting the power supply.
Claim 14
Dependent Claim
15 words
The DC/DC converter as claimed in claim 11, wherein: said interrupting unit is a fuse.
Claim 15
Dependent Claim
26 words
The DC/DC converter as claimed in claim 8, further comprising: an interrupting unit, provided between said power and said first switch element, interrupting the power supply.
Claim 16
Dependent Claim
51 words
The DC/DC converter as claimed in claim 13, wherein said clamping unit makes said second switch to a connecting state when said first switch fails, whereby the voltage derived from said power supply is shortcircuited, and said interrupting unit interrupts the power supply by the power shortcircuited by said shortcircuited unit.
Claim 17
Dependent Claim
81 words
A synchronous rectification type DC/DC converter, comprising: a main switch; a synchronous rectification switch; an overvoltage detecting unit detecting an overvoltage of the synchronous rectification type DC/DC converter output; and a control unit outputting a first control signal to turn OFF the main switch and outputting a second control signal to turn ON the synchronous rectification switch in accordance with a detection of the overvoltage detecting unit so that the synchronous rectification type DC/DC converter output is forced to ground level.
Claim 18
Dependent Claim
81 words
A synchronous rectification type DC/DC converter, comprising: a main switch; a synchronous rectification switch; an overvoltage detecting unit detecting an overvoltage of the synchronous rectification type DC/DC converter output; and a control unit outputting a first control signal to turn OFF the main switch and outputting a second control signal to turn ON the synchronous rectification switch in accordance with a detection of the overvoltage detecting unit so that the synchronous rectification type DC/DC converter output is forced to ground level.
Claim 19
Dependent Claim
32 words
The synchronous rectification type DC/DC converter as claimed in claim 15, further comprising: an inductor connected to said main switch; and a capacitor connected to said inductor smoothing output of said inductor.
Claim 20
Dependent Claim
41 words
The synchronous rectification type DC/DC converter as claimed in claim 16, wherein said control unit turns the main switch OFF and the synchronous rectification switch ON in accordance with the detection of said overvoltage detecting unit, and thereby discharges said capacitor.
Claim 21
Dependent Claim
34 words
The synchronous rectification type DC/DC converter as claimed in claim 15, wherein said overvoltage detecting unit outputs a detecting signal when said overvoltage detects the overvoltage of the synchronous rectification type DC/DC converter output.
Claim 22
Dependent Claim
58 words
The synchronous rectification type DC/DC converter as claimed in claim 18, wherein the control unit has a memory circuit which stores the detecting signal and outputs said first control signal turning OFF the main switch and outputs said second control signal turning ON the synchronous rectification switch, when the detecting signal is inputted from the overvoltage detecting unit.
Claim 23
Dependent Claim
46 words
The synchronous rectification type DC/DC converter as claimed in claim 15, further comprising: a feedback unit effecting feedback control of the synchronous rectification switch and the main switch in order to maintain an output voltage of the synchronous rectification type DC/DC converter at a constant value.
Claim 24
Dependent Claim
36 words
The synchronous rectification type DC/DC converter as claimed in claim 15, wherein said control unit outputs the second control signal when said main switch fails under a shortcircuited state, whereby an input power supply is shortcircuited.
Claim 25
Dependent Claim
31 words
The synchronous rectification type DC/DC converter as claimed in claims 15, further comprising: an interrupting unit, provided between the main switch and power supply, interrupting an input of the power supply.
Claim 26
Dependent Claim
68 words
A synchronous rectification type DC/DC converter, comprising: a main switch; a synchronous rectification switch; an overvoltage detecting unit detecting an overvoltage of the synchronous rectification type DC/DC converter output; and a control unit turning the main switch OFF and the synchronous rectification switch ON in accordance with a detection of the overvoltage detecting unit so that the synchronous rectification type DC/DC converter output is forced to ground level.
Claim 27
Dependent Claim
68 words
A synchronous rectification type DC/DC converter, comprising: a main switch; a synchronous rectification switch; an overvoltage detecting unit detecting an overvoltage of the synchronous rectification type DC/DC converter output; and a control unit turning the main switch OFF and the synchronous rectification switch ON in accordance with a detection of the overvoltage detecting unit so that the synchronous rectification type DC/DC converter output is forced to ground level.
Claim 28
Dependent Claim
96 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 the synchronous rectification type DC/DC converter output; and a control unit outputting a first control signal to turn OFF the main switch and outputting a second control signal to turn ON the synchronous rectification switch in accordance with a detection of the overvoltage detecting unit so that the synchronous rectification type DC/DC converter output is forced to ground level.
Claim 29
Dependent Claim
96 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 the synchronous rectification type DC/DC converter output; and a control unit outputting a first control signal to turn OFF the main switch and outputting a second control signal to turn ON the synchronous rectification switch in accordance with a detection of the overvoltage detecting unit so that the synchronous rectification type DC/DC converter output is forced to ground level.
Claim 30
Dependent Claim
40 words
The control circuit for a synchronous rectification type DC/DC converter as claimed in claim 24, wherein said overvoltage detecting unit outputs a detecting signal when said overvoltage detecting unit detects the overvoltage of the synchronous rectification type DC/DC converter output.
Claim 31
Dependent Claim
62 words
The control circuit for a synchronous rectification type DC/DC converter as claimed in claim 25, wherein the control unit has a memory circuit which stores the detecting signal and outputs said first control signal turning OFF the main switch and outputs said second control signal turning ON the synchronous rectification switch, when the detecting signal is inputted from the overvoltage detecting unit.
Claim 32
Dependent Claim
50 words
The control circuit for a synchronous rectification type DC/DC converter as claimed in claim 24, 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 33
Dependent Claim
38 words
The control circuit for a synchronous rectification type DC/DC converter as claimed in claim 24, wherein said control unit outputs the second control signal when said main switch fails, whereby power derived from said power supply is shortcircuited.
Claim 34
Dependent Claim
114 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 the synchronous rectification type DC/DC converter output; and a control unit outputting a first control signal to turn OFF the main switch and outputting a second control signal to turn ON the synchronous rectification switch in accordance with a detection of the overvoltage detecting unit so that the synchronous rectification type DC/DC converter output is forced to ground level.
Claim 35
Dependent Claim
114 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 the synchronous rectification type DC/DC converter output; and a control unit outputting a first control signal to turn OFF the main switch and outputting a second control signal to turn ON the synchronous rectification switch in accordance with a detection of the overvoltage detecting unit so that the synchronous rectification type DC/DC converter output is forced to ground level.
Claim 36
Dependent Claim
50 words
The control circuit as claimed in 29, wherein said control unit outputs the first control signal to turn OFF the main switch and outputs the second control signal to turn ON the synchronous rectification switch in accordance with the detection of the overvoltage detecting unit, and thereby discharges the capacitor.
Claim 37
Dependent Claim
82 words
A control circuit for a synchronous 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 the synchronous rectification type DC/DC converter output; and a control unit turning the main switch OFF and the synchronous rectification switch ON in accordance with a detection of the overvoltage detecting unit so that the synchronous rectification type DC/DC converter output is forced to ground level.
Claim 38
Dependent Claim
82 words
A control circuit for a synchronous 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 the synchronous rectification type DC/DC converter output; and a control unit turning the main switch OFF and the synchronous rectification switch ON in accordance with a detection of the overvoltage detecting unit so that the synchronous rectification type DC/DC converter output is forced to ground level.
Claim 39
Dependent Claim
101 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 the synchronous rectification type DC/DC converter output; and a control unit turning the main switch OFF and the synchronous rectification switch ON in accordance with a detection of the overvoltage detecting unit so that the synchronous rectification type DC/DC converter output is forced to ground level.
Claim 40
Dependent Claim
101 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 the synchronous rectification type DC/DC converter output; and a control unit turning the main switch OFF and the synchronous rectification switch ON in accordance with a detection of the overvoltage detecting unit so that the synchronous rectification type DC/DC converter output is forced to ground level.
Claim 41
Dependent Claim
38 words
The control circuit as claimed in claim 32, wherein said control unit turns the main switch OFF and the synchronous rectification switch ON in accordance with a detection of said overvoltage detecting unit, and thereby discharges the capacitor.
Claim 42
Dependent Claim
76 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: a receiving unit receiving a stop signal to stop a DC/DC conversion process; and a control unit outputting a first control signal to turn OFF the main switch and a second control signal to turn ON the synchronous rectification switch in response to the received stop signal.
Claim 43
Dependent Claim
76 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: a receiving unit receiving a stop signal to stop a DC/DC conversion process; and a control unit outputting a first control signal to turn OFF the main switch and a second control signal to turn ON the synchronous rectification switch in response to the received stop signal.
Claim 44
Dependent Claim
36 words
The control circuit for a synchronous rectification type DC/DC converter as claimed in claim 34, wherein said stop signal informs that an output voltage of the synchronous rectification type DC/DC converter exceeds a preselected voltage value.
Claim 45
Dependent Claim
50 words
The control circuit for a synchronous rectification type DC/DC converter as claimed in claim 34, 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 46
Dependent Claim
39 words
The control circuit for a synchronous rectification type DC/DC converter as claimed in claim 33, wherein said control unit outputs the second control signal when said main switch fails, whereby power derived from said power supply is short circuited.
Claim 47
Dependent Claim
94 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; and a control unit outputting a first control signal to turn OFF the main switch and a second control signal to turn ON the synchronous rectification switch in response to the received stop signal.
Claim 48
Dependent Claim
94 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; and a control unit outputting a first control signal to turn OFF the main switch and a second control signal to turn ON the synchronous rectification switch in response to the received stop signal.
Claim 49
Dependent Claim
64 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: a receiving unit receiving a stop signal to stop a DC/DC conversion process; and a control unit making the main switch OFF and the synchronous rectification switch ON in response to the received stop signal.
Claim 50
Dependent Claim
64 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: a receiving unit receiving a stop signal to stop a DC/DC conversion process; and a control unit making the main switch OFF and the synchronous rectification switch ON in response to the received stop signal.
Claim 51
Dependent Claim
82 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; and a control unit making the main switch OFF and the synchronous rectification switch ON in response to the received stop signal.
Claim 52
Dependent Claim
82 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; and a control unit making the main switch OFF and the synchronous rectification switch ON in response to the received stop signal.
Claim 53
Dependent Claim
92 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 output voltage of a DC/DC conversion process; an overvoltage detecting unit outputting a detecting signal when the output voltage [is] inputted into the voltage input terminal exceeds a predetermined value; and a clamping unit clamping the output of the DC/DC converter to the ground level by turning OFF the main switch and turning ON the synchronous rectification switch in response to the detecting signal.
Claim 54
Dependent Claim
92 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 output voltage of a DC/DC conversion process; an overvoltage detecting unit outputting a detecting signal when the output voltage [is] inputted into the voltage input terminal exceeds a predetermined value; and a clamping unit clamping the output of the DC/DC converter to the ground level by turning OFF the main switch and turning ON the synchronous rectification switch in response to the detecting signal.
Claim 55
Dependent Claim
65 words
A control circuit for controlling 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; and a control unit cutting-off an output from the DC/DC converter by turning OFF the main switch and turning ON the synchronous rectification switch in response to the received stop signal.
Claim 56
Dependent Claim
65 words
A control circuit for controlling 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; and a control unit cutting-off an output from the DC/DC converter by turning OFF the main switch and turning ON the synchronous rectification switch in response to the received stop signal.
Claim 57
Dependent Claim
167 words
A controller for a synchronous rectification type DC/DC converter having a storage unit storing therein power derived from a power supply, a first switch element connecting/disconnecting the storage unit to/from the power supply, a second switch element provided between the storage unit and ground connecting/disconnecting the storage unit to/from the ground, said controller comprising; a first control unit controlling the connecting/disconnecting operations of the first switch element and the second switch element so as to maintain a voltage outputted from the storage unit at a predetermined value; an overvoltage detecting unit monitoring the voltage outputted from the storage unit and detecting that the output voltage exceeds a predetermined voltage value; and a second control unit bringing the first switch element to a disconnecting state and bringing the second switch element to a connecting state in a case where said overvoltage detecting unit detects that the output voltage exceeds a predetermined voltage value, so that the output voltage from the storage unit is forced to a ground level.
Claim 58
Dependent Claim
167 words
A controller for a synchronous rectification type DC/DC converter having a storage unit storing therein power derived from a power supply, a first switch element connecting/disconnecting the storage unit to/from the power supply, a second switch element provided between the storage unit and ground connecting/disconnecting the storage unit to/from the ground, said controller comprising; a first control unit controlling the connecting/disconnecting operations of the first switch element and the second switch element so as to maintain a voltage outputted from the storage unit at a predetermined value; an overvoltage detecting unit monitoring the voltage outputted from the storage unit and detecting that the output voltage exceeds a predetermined voltage value; and a second control unit bringing the first switch element to a disconnecting state and bringing the second switch element to a connecting state in a case where said overvoltage detecting unit detects that the output voltage exceeds a predetermined voltage value, so that the output voltage from the storage unit is forced to a ground level.
Claim 59
Dependent Claim
56 words
The controller as claimed in claim 43 wherein said overvoltage detecting unit comprises: a reference voltage producing unit producing a reference voltage; and a voltage comparator comparing said reference voltage with the voltage derived from the storage unit and outputting the signal when the voltage derived from the storage unit is higher that the reference voltage.
Claim 60
Dependent Claim
113 words
A controller for a DC/DC converter having a storage unit storing therein power from a power supply, a first switch connecting/disconnecting the storage unit to/from the power supply, a second switch provided between the storage unit and ground connecting/disconnecting the storage unit to/from the ground, said controller comprising: a first control unit controlling the first switch and the second switch so as to maintain a voltage outputted from the storage unit at a predetermined value; a detecting unit detecting that the voltage outputted from the storage unit exceeds the predetermined voltage value; and a second control unit making the first switch disconnect and the second switch connect in accordance with said detecting unit.
Claim 61
Dependent Claim
113 words
A controller for a DC/DC converter having a storage unit storing therein power from a power supply, a first switch connecting/disconnecting the storage unit to/from the power supply, a second switch provided between the storage unit and ground connecting/disconnecting the storage unit to/from the ground, said controller comprising: a first control unit controlling the first switch and the second switch so as to maintain a voltage outputted from the storage unit at a predetermined value; a detecting unit detecting that the voltage outputted from the storage unit exceeds the predetermined voltage value; and a second control unit making the first switch disconnect and the second switch connect in accordance with said detecting unit.
Claim 62
Dependent Claim
66 words
The DC/DC converter as claimed in claim 45, wherein said detecting unit comprises: a reference voltage producing unit producing the predetermined voltage value; and a voltage comparator comparing the predetermined voltage value produced by said reference voltage producing unit with the voltage derived from the storage unit and outputting a signal when the voltage derived from the storage unit is higher than the predetermined voltage value.
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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) | 2003-02-21 | 2003-08-23 | 2004-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-02-21 | 2007-08-23 | 2008-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-02-21 | 2011-08-23 | 2012-02-22 | $7700.00 | Window Closed / Lapsed |