Patent US5932938A successfully refreshed from Google Patents.
US5932938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching power supply unit
Assignee: Fujitsu Ltd
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Filing: 1998-03-24
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Granted: 1999-08-03
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Expires: 2018-03-24
Abstract
Abstract A switching power supply unit controls an output voltage of a power supply without monitoring an output voltage. The switching power supply unit includes a pulse width modulator for generating a control signal to turn on and off a switching transistor. A central processing unit outputs a modulation signal to control the pulse width modulator while sensors detect an input voltage, an output current and a peripheral temperature. A table is used by the central processing unit to store information about a relation between the detected values from the sensors and an ON time of the switching transistor. The central processing unit then selects an ON time of the switching transistor from the table according to values detected by the respective sensors to thereby provide control for switching the switching transistor on and off. The switching transistor is switched according to the selected time and to thereby switch an input voltage in response to changes of an input voltage, an output current and a peripheral temperature without monitoring an output voltage. Furthermore, the output voltage can be maintained with stability at a desired output voltage.
Inventors
- 👤 Hiroshi Shimamori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:57
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; H02M3/157; H02M1/00; H02M1/0003; H02M1/0016; H02M1/0022
Claims Analysis
Total Claims: 48
Claim 1
Independent Claim
117 words
A switching power supply unit, comprising: an input terminal and an output terminal; an input voltage detector to detect an input voltage at said input terminal; a switching unit to selectively connect said input terminal and said output terminal during an ON time and to selectively disconnect said input terminal from said output terminal during an OFF time; a storing unit having a table to store input voltage values and corresponding control information for switching said switching unit ON or OFF; and a controller to control the ON time or the OFF time of said switching unit with control information from said storing unit which corresponds to the input voltage value detected by said input voltage detector.
Claim 2
Dependent Claim
117 words
A switching power supply unit, comprising: an input terminal and an output terminal; an input voltage detector to detect an input voltage at said input terminal; a switching unit to selectively connect said input terminal and said output terminal during an ON time and to selectively disconnect said input terminal from said output terminal during an OFF time; a storing unit having a table to store input voltage values and corresponding control information for switching said switching unit ON or OFF; and a controller to control the ON time or the OFF time of said switching unit with control information from said storing unit which corresponds to the input voltage value detected by said input voltage detector.
Claim 3
Dependent Claim
80 words
A switching power supply unit according to claim 1, further comprising: a peripheral temperature detector to detect a peripheral temperature, wherein the table of said storing unit stores peripheral temperatures and corresponding ON times and OFF times of said switching unit, and wherein said controller receives the peripheral temperature detected by said peripheral temperature detector and controls the ON time or the OFF time of said switching unit according to a corresponding ON time or OFF time from the table.
Claim 4
Dependent Claim
58 words
A switching power supply unit according to claim 1, further comprising: a table preparing unit to set at least one of an input voltage, an output current, and a peripheral temperature to a specified value, and to store control information corresponding to the ON time when an output voltage is set to a specified value in the table.
Claim 5
Dependent Claim
64 words
A switching power supply unit according to claim 1, further comprising: an output voltage detector to detect an output voltage value at said output terminal, wherein said storing unit stores a reference voltage value of an output voltage; and a table updating unit to update the table according to an output voltage value detected by said output voltage detector and the reference voltage value.
Claim 6
Dependent Claim
34 words
A switching power supply unit according to claim 4, further comprising a timer unit to specify periods of time, wherein said table updating unit updates the table once for every specified period of time.
Claim 7
Dependent Claim
54 words
A switching power supply unit according to claim 5, wherein the table is stored in a read-only memory, said table updating unit generates an equation for correction of the table or generates a corrected table, and said controller corrects a value in the table according to said equation for correction or said corrected table.
Claim 8
Dependent Claim
40 words
A switching power supply unit according to claim 5, wherein the table is stored in a non-volatile memory or an electrically erasable/rewritable read-only memory, and said table updating unit updates each value stored in the table to a new value.
Claim 9
Dependent Claim
69 words
A switching power supply unit according to claim 1, comprising: an output voltage detector to detect an output voltage value at said output terminal for a connected external load, wherein said storing unit stores a reference voltage value of an output voltage; and a table updating unit for updating the table according to an output voltage value detected by said output voltage detector and the stored reference voltage value.
Claim 10
Dependent Claim
33 words
A switching power supply unit according to claim 8, further comprising timer unit to specify periods of time, wherein said table updating unit updates the table once for every specified period of time.
Claim 11
Dependent Claim
54 words
A switching power supply unit according to claim 9, wherein the table is stored in a read-only memory, said table updating unit generates an equation for correction of the table or generates a corrected table, and said controller corrects a value in the table according to said equation for correction or said corrected table.
Claim 12
Dependent Claim
40 words
A switching power supply unit according to claim 9, wherein the table is stored in a non-volatile memory or an electrically erasable/rewritable read-only memory, and said table updating unit updates each value stored in the table to a new value.
Claim 13
Dependent Claim
17 words
A switching power supply unit according to claim 1, wherein said switching unit comprises a switching transistor.
Claim 14
Dependent Claim
42 words
A switching power supply unit according to claim 12, wherein said controller selects control information for said switching unit from the table, and prepares a pulse signal for controlling a switching operation of said switching unit according to said selected control information.
Claim 15
Dependent Claim
29 words
A switching power supply unit according to claim 13, wherein said controller changes a pulse width of a pulse signal for controlling a switching operation of said switching unit.
Claim 16
Dependent Claim
28 words
A switching power supply unit according to claim 13, wherein said controller changes a frequency of a pulse signal for controlling a switching operation of said switching unit.
Claim 17
Dependent Claim
121 words
A switching power supply unit comprising: an input terminal and an output terminal; a switching unit to selectively connect said input terminal and said output terminal during an ON time and to selectively disconnect said input terminal from said output terminal during an OFF time; an output current detector to detect a current value of an output current at said output terminal; a storing unit having a table to store input voltage values and corresponding control information for switching said switching unit ON or OFF; and a controller to control the ON time or the OFF time of said switching unit with control information from said storing unit which corresponds to the output current value detected by said output current detector.
Claim 18
Dependent Claim
121 words
A switching power supply unit comprising: an input terminal and an output terminal; a switching unit to selectively connect said input terminal and said output terminal during an ON time and to selectively disconnect said input terminal from said output terminal during an OFF time; an output current detector to detect a current value of an output current at said output terminal; a storing unit having a table to store input voltage values and corresponding control information for switching said switching unit ON or OFF; and a controller to control the ON time or the OFF time of said switching unit with control information from said storing unit which corresponds to the output current value detected by said output current detector.
Claim 19
Dependent Claim
80 words
A switching power supply unit according to claim 16, further comprising: a peripheral temperature detector to detect a peripheral temperature, wherein the table of said storing unit stores peripheral temperatures and corresponding ON times and OFF times of said switching unit, and wherein said controller receives the peripheral temperature detected by said peripheral temperature detector and controls the ON time or the OFF time of said switching unit according to a corresponding ON time or OFF time from the table.
Claim 20
Dependent Claim
58 words
A switching power supply unit according to claim 16, further comprising: a table preparing unit to set at least one of an input voltage, an output current, and a peripheral temperature to a specified value, and to store control information corresponding to the ON time when an output voltage is set to a specified value in the table.
Claim 21
Dependent Claim
64 words
A switching power supply unit according to claim 16, further comprising: an output voltage detector to detect an output voltage value at said output terminal, wherein said storing unit stores a reference voltage value of an output voltage; and a table updating unit to update the table according to an output voltage value detected by said output voltage detector and the reference voltage value.
Claim 22
Dependent Claim
34 words
A switching power supply unit according to claim 19, further comprising a timer unit to specify periods of time, wherein said table updating unit updates the table once for every specified period of time.
Claim 23
Dependent Claim
54 words
A switching power supply unit according to claim 20, wherein the table is stored in a read-only memory, said table updating unit generates an equation for correction of the table or generates a corrected table, and said controller corrects a value in the table according to said equation for correction or said corrected table.
Claim 24
Dependent Claim
40 words
A switching power supply unit according to claim 20, wherein the table is stored in a non-volatile memory or an electrically erasable/rewritable read-only memory, and said table updating unit updates each value stored in the table to a new value.
Claim 25
Dependent Claim
64 words
A switching power supply unit according to claim 16, further comprising: an output voltage detector to detect an output voltage value at said output terminal, wherein said storing unit stores a reference voltage value of an output voltage; and a table updating unit to update the table according to an output voltage value detected by said output voltage detector and the reference voltage value.
Claim 26
Dependent Claim
34 words
A switching power supply unit according to claim 23, further comprising a timer unit to specify periods of time, wherein said table updating unit updates the table once for every specified period of time.
Claim 27
Dependent Claim
54 words
A switching power supply unit according to claim 24, wherein the table is stored in a read-only memory, said table updating unit generates an equation for correction of the table or generates a corrected table, and said controller corrects a value in the table according to said equation for correction or said corrected table.
Claim 28
Dependent Claim
40 words
A switching power supply unit according to claim 24, wherein the table is stored in a non-volatile memory or an electrically erasable/rewritable read-only memory, and said table updating unit updates each value stored in the table to a new value.
Claim 29
Dependent Claim
17 words
A switching power supply unit according to claim 16, wherein said switching unit comprises a switching transistor.
Claim 30
Dependent Claim
42 words
A switching power supply unit according to claim 27, wherein said controller selects control information for said switching unit from the table, and prepares a pulse signal for controlling a switching operation of said switching unit according to said selected control information.
Claim 31
Dependent Claim
29 words
A switching power supply unit according to claim 28, wherein said controller changes a pulse width of a pulse signal for controlling a switching operation of said switching unit.
Claim 32
Dependent Claim
28 words
A switching power supply unit according to claim 28, wherein said controller changes a frequency of a pulse signal for controlling a switching operation of said switching unit.
Claim 33
Dependent Claim
136 words
A switching power supply unit comprising: an input terminal and an output terminal; an input voltage detector to detect a voltage value at said input terminal; an output current detector to detect an output current; a switching unit to selectively connect said input terminal and said output terminal during an ON time and to selectively disconnect said input terminal from said output terminal during an OFF time; a storing unit having a table to store input voltage values and corresponding control information for switching said switching unit ON or OFF; and a controller to control the ON time or the OFF time of said switching unit with control information from said storing unit which corresponds to the input voltage value detected by said input voltage detector, an output current value detected by said output current detector.
Claim 34
Dependent Claim
136 words
A switching power supply unit comprising: an input terminal and an output terminal; an input voltage detector to detect a voltage value at said input terminal; an output current detector to detect an output current; a switching unit to selectively connect said input terminal and said output terminal during an ON time and to selectively disconnect said input terminal from said output terminal during an OFF time; a storing unit having a table to store input voltage values and corresponding control information for switching said switching unit ON or OFF; and a controller to control the ON time or the OFF time of said switching unit with control information from said storing unit which corresponds to the input voltage value detected by said input voltage detector, an output current value detected by said output current detector.
Claim 35
Dependent Claim
80 words
A switching power supply unit according to claim 31, further comprising: a peripheral temperature detector to detect a peripheral temperature, wherein the table of said storing unit stores peripheral temperatures and corresponding ON times and OFF times of said switching unit, and wherein said controller receives the peripheral temperature detected by said peripheral temperature detector and controls the ON time or the OFF time of said switching unit according to a corresponding ON time or OFF time from the table.
Claim 36
Dependent Claim
58 words
A switching power supply unit according to claim 31 further comprising: a table preparing unit for setting at least one of an input voltage, an output current, and a peripheral temperature to a specified value, and to store control information corresponding to the ON time when an output voltage is set to a specified value in the table.
Claim 37
Dependent Claim
64 words
A switching power supply unit according to claim 31, further comprising: an output voltage detector to detect an output voltage value at said output terminal, wherein said storing unit stores a reference voltage value of an output voltage; and a table updating unit to update the table according to an output voltage value detected by said output voltage detector and the reference voltage value.
Claim 38
Dependent Claim
34 words
A switching power supply unit according to claim 34, further comprising a timer unit to specify periods of time, wherein said table updating unit updates the table once for every specified period of time.
Claim 39
Dependent Claim
53 words
A switching power supply unit according to claim 35, wherein the table is stored in a read-only memory, said table updating unit generates an equation for correction of the table or a corrected table, and said controller corrects a value in the table according to said equation for correction or said corrected table.
Claim 40
Dependent Claim
40 words
A switching power supply unit according to claim 35, wherein the table is stored in a non-volatile memory or an electrically erasable/rewritable read-only memory, and said table updating unit updates each value stored in the table to a new value.
Claim 41
Dependent Claim
78 words
A switching power supply unit according to claim 31 comprising: an output voltage detector for detecting a voltage value at an input terminal for an external load connected to said output terminal; a storing unit with a reference voltage value as a reference for an output voltage stored therein; and a table updating unit for updating the table according to an output voltage value detected by said output voltage detector as well as to said reference voltage value.
Claim 42
Dependent Claim
32 words
A switching power supply unit according to claim 38 having a timer unit for counting a time, wherein said table updating unit updates the table once for every specified period of time.
Claim 43
Dependent Claim
54 words
A switching power supply unit according to claim 39, wherein the table is stored in a read-only memory, said table updating unit generates an equation for correction of the table or generates a corrected table, and said controller corrects a value in the table according to said equation for correction or said corrected table.
Claim 44
Dependent Claim
40 words
A switching power supply unit according to claim 39, wherein the table is stored in a non-volatile memory or an electrically erasable/rewritable read-only memory, and said table updating unit updates each value stored in the table to a new value.
Claim 45
Dependent Claim
17 words
A switching power supply unit according to claim 31, wherein said switching unit comprises a switching transistor.
Claim 46
Dependent Claim
42 words
A switching power supply unit according to claim 42, wherein said controller selects control information for said switching unit from the table, and prepares a pulse signal to control a switching operation of said switching unit according to said selected control information.
Claim 47
Dependent Claim
29 words
A switching power supply unit according to claim 43, wherein said controller changes a pulse width of a pulse signal to control a switching operation of said switching unit.
Claim 48
Dependent Claim
28 words
A switching power supply unit according to claim 43, wherein said controller changes a frequency of a pulse signal to control a switching operation of said switching unit.
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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) | 2002-08-02 | 2003-02-01 | 2003-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-08-02 | 2007-02-01 | 2007-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-08-02 | 2011-02-01 | 2011-08-03 | $7700.00 | Window Closed / Lapsed |