US3714511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply protection circuit
Assignee: TE Connectivity Corp
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Filing: 1972-04-10
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Granted: 1973-01-30
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Expires: 1992-04-10
Abstract
Abstract A circuit is disclosed for protecting a power supply including a Royer type inverter circuit from damage due to overloading. The protective circuit includes a capacitor for triggering a normally non-conductive silicon controlled rectifier in response to an increase in voltage across the switching transistors of the Royer circuit caused by overloading. When triggered, the silicon controlled rectifier reduces the output of a Darlington amplifier, which in turn reduces the power delivered to the switching transistors. The protective circuit may include a network for automatically returning the silicon controlled rectifier to its non-conductive state, thereby restoring normal operation of the overall power supply circuit.
Inventors
- 👤 C Fendrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:39
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5383; H02M7/53846; H02M7/53862; H02H; H02H7/00; H02H7/10; H02H7/12; H02H7/1213
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
152 words
A voltage responsive protective circuit for a power supply including a plurality of switching transistors, comprising: amplifier circuit means coupled to said switching transistors for supplying power to said switching transistors, energy storage means coupled to said switching transistors for developing a variable signal indicative of the operating condition Of said switching transistors, protective circuit means coupled to said energy storage means, said protective circuit including electronic switching means selectively actuated by said energy storage means in response to the development by said energy storage means of a signal indicating a particular operating condition of said switching transistors; and, circuit means coupled between said protective circuit and said amplifier circuit means for reducing the output of said amplifier circuit means in response to actuation of said electronic switching means, whereby said power supply is protected against damage due to the existence of said particular operating condition for a prolonged interval of time.
Claim 2
Dependent Claim
152 words
A voltage responsive protective circuit for a power supply including a plurality of switching transistors, comprising: amplifier circuit means coupled to said switching transistors for supplying power to said switching transistors, energy storage means coupled to said switching transistors for developing a variable signal indicative of the operating condition Of said switching transistors, protective circuit means coupled to said energy storage means, said protective circuit including electronic switching means selectively actuated by said energy storage means in response to the development by said energy storage means of a signal indicating a particular operating condition of said switching transistors; and, circuit means coupled between said protective circuit and said amplifier circuit means for reducing the output of said amplifier circuit means in response to actuation of said electronic switching means, whereby said power supply is protected against damage due to the existence of said particular operating condition for a prolonged interval of time.
Claim 3
Dependent Claim
152 words
A voltage responsive protective circuit for a power supply including a plurality of switching transistors, comprising: amplifier circuit means coupled to said switching transistors for supplying power to said switching transistors, energy storage means coupled to said switching transistors for developing a variable signal indicative of the operating condition Of said switching transistors, protective circuit means coupled to said energy storage means, said protective circuit including electronic switching means selectively actuated by said energy storage means in response to the development by said energy storage means of a signal indicating a particular operating condition of said switching transistors; and, circuit means coupled between said protective circuit and said amplifier circuit means for reducing the output of said amplifier circuit means in response to actuation of said electronic switching means, whereby said power supply is protected against damage due to the existence of said particular operating condition for a prolonged interval of time.
Claim 4
Dependent Claim
152 words
A voltage responsive protective circuit for a power supply including a plurality of switching transistors, comprising: amplifier circuit means coupled to said switching transistors for supplying power to said switching transistors, energy storage means coupled to said switching transistors for developing a variable signal indicative of the operating condition Of said switching transistors, protective circuit means coupled to said energy storage means, said protective circuit including electronic switching means selectively actuated by said energy storage means in response to the development by said energy storage means of a signal indicating a particular operating condition of said switching transistors; and, circuit means coupled between said protective circuit and said amplifier circuit means for reducing the output of said amplifier circuit means in response to actuation of said electronic switching means, whereby said power supply is protected against damage due to the existence of said particular operating condition for a prolonged interval of time.
Claim 5
Dependent Claim
36 words
A voltage responsive protective circuit as in claim 1, wherein: said protective circuit means includes voltage divider means; and, said voltage divider means is coupled to said energy storage means and to said electronic switching means.
Claim 6
Dependent Claim
34 words
A voltage responsive protective circuit as in claim 2, wherein: said electronic switching means comprises a silicon controlled rectifier including a gate electrode; and, said gate electrode is coupled to said voltage divider means.
Claim 7
Dependent Claim
47 words
A voltage responsive protective circuit as in claim 1, wherein: said amplifier circuit means includes a control electrode, said circuit means includes a current limiting means for limiting the maximum current flow through said protective circuit means; and, said circuit means is coupled to said control electrode.
Claim 8
Dependent Claim
38 words
A voltage responsive protective circuit as in claim 4, wherein: said amplifier circuit means includes capacitor means coupled to said control electrode and to said current limiting means for delivering a current pulse to said protective circuit means.
Claim 9
Dependent Claim
37 words
A voltage responsive protective circuit as in claim 1, wherein: said amplifier circuit means includes current control means coupled to said circuit means for returning said electronic switching means from its actuated state to its inactuated state.
Claim 10
Dependent Claim
31 words
A voltage responsive protective circuit as in claim 1, wherein: said protective circuit means includes second energy storage means for preventing said electronic switching means from being actuated by spurious signals.
Claim 11
Dependent Claim
35 words
A voltage responsive protective circuit as in claim 7, wherein: said electronic switching means comprises a silicon controlled rectifier including a gate electrode; and, said second energy storage means is coupled to said gate electrode.
Claim 12
Dependent Claim
39 words
A voltage responsive protective circuit as in claim 1, wherein: said amplifier circuit means includes current control means coupled to said circuit means for preventing said electronic switching means from returning to its inactuated state from its actuated state.
References Cited (Backward Citations)
US3386005A
Cited
US3531711A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |