US6094362A
Expired / Lapsed
US
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Switched-mode power converter with triple protection in a single latch
Assignee: Hewlett Packard Development Co LP
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Filing: 1998-08-03
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Granted: 2000-07-25
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Expires: 2018-08-03
Abstract
Abstract A single overvoltage, overcurrent, and overtemperature protection circuit for use in an off-line switched-mode power converter using current-mode pulse-width modulation control. A single latch circuit provides shutdown control via either voltage or current inputs of the pulse-width modulator.
Inventors
- 👤 Reynaldo P. Domingo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:54
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/32
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
114 words
A power supply circuit, comprising: a switched-mode power conversion circuit; a pulse-width modulator circuit operatively connected to apply drive pulses to operate said conversion circuit, and connected to be controlled by feedback signals received at a modulator voltage input and a modulator current input; and a latching circuit which is operatively connected to detect overvoltage, overtemperature, and overcurrent conditions in said power conversion circuit, and which is connected to shut down said modulator circuit by driving said modulator voltage input during an overvoltage or overtemperature condition, and connected to shut down said modulator circuit by driving said modulator current input during an overcurrent condition; wherein said latching circuit comprises a bistable semiconductor device structure.
Claim 2
Dependent Claim
114 words
A power supply circuit, comprising: a switched-mode power conversion circuit; a pulse-width modulator circuit operatively connected to apply drive pulses to operate said conversion circuit, and connected to be controlled by feedback signals received at a modulator voltage input and a modulator current input; and a latching circuit which is operatively connected to detect overvoltage, overtemperature, and overcurrent conditions in said power conversion circuit, and which is connected to shut down said modulator circuit by driving said modulator voltage input during an overvoltage or overtemperature condition, and connected to shut down said modulator circuit by driving said modulator current input during an overcurrent condition; wherein said latching circuit comprises a bistable semiconductor device structure.
Claim 3
Dependent Claim
13 words
The circuit of claim 1, wherein said power supply circuit embodies flyback topology.
Claim 4
Dependent Claim
19 words
The circuit of claim 1, wherein said latching circuit cycles power on and off when in an overtemperature condition.
Claim 5
Dependent Claim
21 words
The circuit of claim 1, wherein said latching circuit cycles power on and off when in an overvoltage or overcurrent condition.
Claim 6
Dependent Claim
13 words
The circuit of claim 1, wherein said pulse-width modulator resets said latching circuit.
Claim 7
Dependent Claim
23 words
The circuit of claim 1, wherein said modulator, in response to said latching circuit, cycles on and off when an overtemperature condition occurs.
Claim 8
Dependent Claim
98 words
A power supply protection circuit, comprising: a switched-mode power conversion circuit; a pulse-width modulator circuit operatively connected to apply drive pulses to operate said conversion circuit; a latch which is operatively connected to disable said modulator circuit whenever said latch is in a set condition; an overvoltage protection circuit connected to set said latch when an overvoltage condition occurs; an overtemperature protection circuit connected to set said latch when an overtemperature condition occurs; and an overcurrent protection circuit connected to set said latch when an overcurrent condition occurs; wherein said latching circuit comprises a bistable semiconductor device structure.
Claim 9
Dependent Claim
98 words
A power supply protection circuit, comprising: a switched-mode power conversion circuit; a pulse-width modulator circuit operatively connected to apply drive pulses to operate said conversion circuit; a latch which is operatively connected to disable said modulator circuit whenever said latch is in a set condition; an overvoltage protection circuit connected to set said latch when an overvoltage condition occurs; an overtemperature protection circuit connected to set said latch when an overtemperature condition occurs; and an overcurrent protection circuit connected to set said latch when an overcurrent condition occurs; wherein said latching circuit comprises a bistable semiconductor device structure.
Claim 10
Dependent Claim
13 words
The circuit of claim 7, wherein said power supply circuit embodies flyback topology.
Claim 11
Dependent Claim
18 words
The circuit of claim 7, wherein said latch cycles power on and off when in an overtemperature condition.
Claim 12
Dependent Claim
20 words
The circuit of claim 7, wherein said latch cycles power on and off when in an overvoltage or overcurrent condition.
Claim 13
Dependent Claim
12 words
The circuit of claim 7, wherein said pulse-width modulator resets said latch.
Claim 14
Dependent Claim
22 words
The circuit of claim 7, wherein said modulator, in response to said latch, cycles on and off when an overtemperature condition occurs.
Claim 15
Independent Claim
64 words
A method for overcurrent, overvoltage, and overtemperature protection in a power supply, comprising the steps of: (a.) providing a switched-mode power conversion circuit for (b.) operating said switched-mode power conversion circuit with a pulse-width modulator circuit; and (c.) disabling said modulator circuit with a latching circuit when said overvoltage, overtemperature, or overcurrent condition occurs; wherein said latching circuit comprises a bistable semiconductor device structure.
Claim 16
Independent Claim
64 words
A method for overcurrent, overvoltage, and overtemperature protection in a power supply, comprising the steps of: (a.) providing a switched-mode power conversion circuit for (b.) operating said switched-mode power conversion circuit with a pulse-width modulator circuit; and (c.) disabling said modulator circuit with a latching circuit when said overvoltage, overtemperature, or overcurrent condition occurs; wherein said latching circuit comprises a bistable semiconductor device structure.
Claim 17
Dependent Claim
13 words
The method of claim 13, wherein said power supply circuit embodies flyback topology.
Claim 18
Dependent Claim
19 words
The method of claim 13, wherein said latching circuit cycles power on and off when in an overtemperature condition.
Claim 19
Dependent Claim
21 words
The method of claim 13, wherein said latching circuit cycles power on and off when in an overvoltage or overcurrent condition.
Claim 20
Dependent Claim
13 words
The method of claim 13, wherein said pulse-width modulator resets said latching circuit.
Claim 21
Dependent Claim
23 words
The method of claim 13, wherein said modulator, in response to said latching circuit, cycles on and off when an overtemperature condition occurs.
Claim 22
Dependent Claim
170 words
A computer system, comprising: a user input device, a microprocessor which is operatively connected to detect inputs from said input device, random-access memory which is connected to be read/write accessible by said microprocessor, and an output device operatively connected to receive outputs from said microprocessor; and a power supply connected to provide power to said computer system, said power supply comprising a switched-mode power conversion circuit; a pulse-width modulator circuit operatively connected to apply drive pulses to operate said conversion circuit, and connected to be controlled by feedback signals received at a modulator voltage input and a modulator current input; and a latching circuit which is operatively connected to detect overvoltage, overtemperature, and overcurrent conditions in said power conversion circuit, and which is connected to shut down said modulator circuit by driving said modulator voltage input during an overvoltage or overtemperature condition, and connected to shut down said modulator circuit by driving said modulator current input during an overcurrent condition; wherein said latching circuit comprises a bistable semiconductor device structure.
Claim 23
Dependent Claim
170 words
A computer system, comprising: a user input device, a microprocessor which is operatively connected to detect inputs from said input device, random-access memory which is connected to be read/write accessible by said microprocessor, and an output device operatively connected to receive outputs from said microprocessor; and a power supply connected to provide power to said computer system, said power supply comprising a switched-mode power conversion circuit; a pulse-width modulator circuit operatively connected to apply drive pulses to operate said conversion circuit, and connected to be controlled by feedback signals received at a modulator voltage input and a modulator current input; and a latching circuit which is operatively connected to detect overvoltage, overtemperature, and overcurrent conditions in said power conversion circuit, and which is connected to shut down said modulator circuit by driving said modulator voltage input during an overvoltage or overtemperature condition, and connected to shut down said modulator circuit by driving said modulator current input during an overcurrent condition; wherein said latching circuit comprises a bistable semiconductor device structure.
Claim 24
Dependent Claim
13 words
The system of claim 19, wherein said power supply circuit embodies flyback topology.
Claim 25
Dependent Claim
19 words
The system of claim 19, wherein said latching circuit cycles power on and off when in an overtemperature condition.
Claim 26
Dependent Claim
21 words
The system of claim 19, wherein said latching circuit cycles power on and off when in an overvoltage or overcurrent condition.
Claim 27
Dependent Claim
13 words
The system of claim 19, wherein said pulse-width modulator resets said latching circuit.
Claim 28
Dependent Claim
23 words
The system of claim 19, wherein said modulator, in response to said latching circuit, cycles on and off when an overtemperature condition occurs.
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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) | 2003-07-25 | 2004-01-24 | 2004-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-07-25 | 2008-01-24 | 2008-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-07-25 | 2012-01-24 | 2012-07-25 | $7700.00 | Window Closed / Lapsed |