US5029269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Delayed power supply overvoltage shutdown apparatus
Assignee: Boeing North American Inc
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Filing: 1990-04-12
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Granted: 1991-07-02
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Expires: 2010-04-12
Abstract
Abstract A pulse-width modulated DC-DC power supply is illustrated with overvoltage protection which upon initial detection momentarily shuts down the pulse-width modulating portion of the control loop for a given cycle. If the overvoltage condition persists for more than a prescribed number of cycles or amount of time, the power supply is shut down permanently. The delay between momentary and permanent shut down being used to allow system operation to be maintained with minimal damage (voltage induced load stress) where large voltage transients may be temporarily introduced into the system.
Inventors
- 👤 Brent Elliott
- 👤 Ed Johnson
- 👤 Lee Marusik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:10
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/02; H02H3/025; H02H7/00; H02H7/10; H02H7/12; H02H7/1213; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33538; H02M3/33546
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
95 words
Overvoltage protection apparatus comprising, in combination: DC--DC switched-mode power supply means, including a control feedback loop, for controlling the duty cycle of a power switch to maintain output voltage regulation; overvoltage detection means, connected in parallel with said control feedback loop, for instantaneously switching the power switch to an OFF condition upon detection of the output voltage exceeding a predetermined value; and time delayed means, connected to said overvoltage detection means, for latching said power switch to an OFF condition if the predetermined value of output voltage is detected for more than a predetermined time.
Claim 2
Dependent Claim
95 words
Overvoltage protection apparatus comprising, in combination: DC--DC switched-mode power supply means, including a control feedback loop, for controlling the duty cycle of a power switch to maintain output voltage regulation; overvoltage detection means, connected in parallel with said control feedback loop, for instantaneously switching the power switch to an OFF condition upon detection of the output voltage exceeding a predetermined value; and time delayed means, connected to said overvoltage detection means, for latching said power switch to an OFF condition if the predetermined value of output voltage is detected for more than a predetermined time.
Claim 3
Independent Claim
93 words
The method of protecting a load from being subjected to a continuous overvoltage condition while not overly reacting to momentary voltage surges at the output of a cyclically ON/OFF switched PWM (pulse-width modulated) DC--DC converter comprising the steps of: monitoring the output voltage of a PWM converter; cyclically turning the PWM portion of the converter to an OFF condition immediately upon detection of an overvoltage condition; timing the duration of the overvoltage condition; and latching the PWM converter to an OFF condition if the duration of the overvoltage condition exceeds a predetermined time.
Claim 4
Independent Claim
93 words
The method of protecting a load from being subjected to a continuous overvoltage condition while not overly reacting to momentary voltage surges at the output of a cyclically ON/OFF switched PWM (pulse-width modulated) DC--DC converter comprising the steps of: monitoring the output voltage of a PWM converter; cyclically turning the PWM portion of the converter to an OFF condition immediately upon detection of an overvoltage condition; timing the duration of the overvoltage condition; and latching the PWM converter to an OFF condition if the duration of the overvoltage condition exceeds a predetermined time.
Claim 5
Dependent Claim
125 words
Apparatus for protecting a load from being subjected to a continuously occurring overvoltage condition while not overly reacting to momentary voltage surges at the output of a switched PWM (pulse-width modulated) DC--DC converter comprising, in combination: PWM converter including a cyclically operating ON/OFF switch used as part of the output voltage control; first means, connected to said converter, for monitoring the output voltage; second means, connected to said first means, for cyclically turning the switch to an OFF condition immediately upon detection of an overvoltage condition; third means for timing the duration of the overvoltage condition; and fourth means, connected to said second and third means, for latching the switch to an OFF condition if the duration of the overvoltage condition exceeds a predetermined time.
Claim 6
Dependent Claim
125 words
Apparatus for protecting a load from being subjected to a continuously occurring overvoltage condition while not overly reacting to momentary voltage surges at the output of a switched PWM (pulse-width modulated) DC--DC converter comprising, in combination: PWM converter including a cyclically operating ON/OFF switch used as part of the output voltage control; first means, connected to said converter, for monitoring the output voltage; second means, connected to said first means, for cyclically turning the switch to an OFF condition immediately upon detection of an overvoltage condition; third means for timing the duration of the overvoltage condition; and fourth means, connected to said second and third means, for latching the switch to an OFF condition if the duration of the overvoltage condition exceeds a predetermined time.
Claim 7
Dependent Claim
23 words
Apparatus as claimed in claim 3 wherein said fourth means comprises a retriggerable monostable multivibrator, a non-retriggerable monostable multivibrator, and a D flip-flop.
Claim 8
Dependent Claim
102 words
Power supply overvoltage protection apparatus comprising, in combination: power supply means, including a control feedback loop driving a variable duration switch, for controlling the duty cycle of a power switch to maintain output voltage regulation; overvoltage detection means, connected in parallel with said control feedback loop, for instantaneously altering the ON switching time duration on a cycle-by-cycle basis upon detection of the output voltage exceeding a predetermined value; and time delayed means, connected to said overvoltage detection means, for latching said power switch to an OFF condition if the predetermined value of output voltage is detected for more than a predetermined time.
Claim 9
Dependent Claim
102 words
Power supply overvoltage protection apparatus comprising, in combination: power supply means, including a control feedback loop driving a variable duration switch, for controlling the duty cycle of a power switch to maintain output voltage regulation; overvoltage detection means, connected in parallel with said control feedback loop, for instantaneously altering the ON switching time duration on a cycle-by-cycle basis upon detection of the output voltage exceeding a predetermined value; and time delayed means, connected to said overvoltage detection means, for latching said power switch to an OFF condition if the predetermined value of output voltage is detected for more than a predetermined time.
Claim 10
Dependent Claim
110 words
Overvoltage protection apparatus for use with a DC--DC switched mode power supply including a current-mode control feedback loop driving a variable duration switch which operates to control switching duty cycle comprising, in combination: overvoltage detection means, connected to a current-mode control feedback loop of a DC--DC switched mode power supply, for instantaneously altering the power supply switching time duration on a cycle-by-cycle basis upon detection of the output voltage exceeding a predetermined value; and time delayed latch means, connected to said overvoltage detection means, for reducing the output voltage of the power supply to zero if the predetermined value of output voltage is detected for more than a predetermined time.
Claim 11
Dependent Claim
110 words
Overvoltage protection apparatus for use with a DC--DC switched mode power supply including a current-mode control feedback loop driving a variable duration switch which operates to control switching duty cycle comprising, in combination: overvoltage detection means, connected to a current-mode control feedback loop of a DC--DC switched mode power supply, for instantaneously altering the power supply switching time duration on a cycle-by-cycle basis upon detection of the output voltage exceeding a predetermined value; and time delayed latch means, connected to said overvoltage detection means, for reducing the output voltage of the power supply to zero if the predetermined value of output voltage is detected for more than a predetermined time.
Claim 12
Dependent Claim
96 words
Overvoltage protection apparatus for use with a power supply including control feedback which operates to control a switch to maintain output voltage regulation comprising, in combination: overvoltage detection means, connected to a control feedback loop of a power supply, for momentarily shutting down the power supply on a cyclical basis upon detection of the output voltage exceeding a predetermined value; and latch means, connected to said overvoltage detection means, for permanently reducing the output voltage of the power supply to zero if the predetermined value of output voltage is detected for more than a predetermined time.
Claim 13
Dependent Claim
96 words
Overvoltage protection apparatus for use with a power supply including control feedback which operates to control a switch to maintain output voltage regulation comprising, in combination: overvoltage detection means, connected to a control feedback loop of a power supply, for momentarily shutting down the power supply on a cyclical basis upon detection of the output voltage exceeding a predetermined value; and latch means, connected to said overvoltage detection means, for permanently reducing the output voltage of the power supply to zero if the predetermined value of output voltage is detected for more than a predetermined time.
Claim 14
Dependent Claim
82 words
Power supply overvoltage protection apparatus comprising, in combination: power supply means, including a control feedback loop, for controlling the output voltage thereof; overvoltage detection means, connected in parallel with said control feedback loop, for momentarily, but cyclically, shutting down the power supply upon detection of the output voltage exceeding a predetermined value; and latch means, connected to said overvoltage detection means, for shutting down the power supply if the predetermined value of output voltage is detected for more than a predetermined time.
Claim 15
Dependent Claim
82 words
Power supply overvoltage protection apparatus comprising, in combination: power supply means, including a control feedback loop, for controlling the output voltage thereof; overvoltage detection means, connected in parallel with said control feedback loop, for momentarily, but cyclically, shutting down the power supply upon detection of the output voltage exceeding a predetermined value; and latch means, connected to said overvoltage detection means, for shutting down the power supply if the predetermined value of output voltage is detected for more than a predetermined time.
Claim 16
Dependent Claim
107 words
Power supply overvoltage protection apparatus comprising, in combination: output voltage controlled power supply means, including controlled voltage output means and a control signal input means, for providing stable output voltage levels under normal conditions; overvoltage detection means, connected to said controlled voltage output means of said power supply means and to said control signal input means thereof; for momentarily, but cyclically, shutting down the power supply means upon detection of the output voltage exceeding a predetermined value; and latch means, connected to said overvoltage detection means, for shutting down the power supply if the predetermined value of output voltage is detected for more than a predetermined time.
Claim 17
Dependent Claim
107 words
Power supply overvoltage protection apparatus comprising, in combination: output voltage controlled power supply means, including controlled voltage output means and a control signal input means, for providing stable output voltage levels under normal conditions; overvoltage detection means, connected to said controlled voltage output means of said power supply means and to said control signal input means thereof; for momentarily, but cyclically, shutting down the power supply means upon detection of the output voltage exceeding a predetermined value; and latch means, connected to said overvoltage detection means, for shutting down the power supply if the predetermined value of output voltage is detected for more than a predetermined time.
References Cited (Backward Citations)
US3816809A
Cited
US4405964A
Cited
US4464709A
Cited
JPS6166561A
Cited
US4739462A
Cited
JPH0270265A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-01 | 1994-12-31 | 1995-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-01 | 1998-12-31 | 1999-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-01 | 2002-12-31 | 2003-07-02 | $7700.00 | Window Closed / Lapsed |