US4752865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power source device for circuit breaker
Assignee: Mitsubishi Electric Corp
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Filing: 1987-05-29
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Granted: 1988-06-21
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Expires: 2007-05-29
Abstract
Abstract A power source device for a circuit breaker responsive to a current output of a current detection circuit having a capacitor chargeable to provide a voltage output and a switching circuit for switching between charging and discharging states of the capacitor. A dummy burden is connected to the switching circuit and set at a substantially equal burden formed by a load and a constant voltage generating circuit to eliminate fluctuations in the charging and discharging states of the capacitor. As a result, accuracy in the detected current output is substantially improved without the use of a high-capacitance and high-withstand-voltage capacity.
Inventors
- 👤 Yoshihiro Hatakeyama
- 👤 Ichirou Arinobu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:39
CPC Classifications
H; H02; H02H; H02H1/00; H02H1/06; H02H1/063; H02H1/066; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
150 words
A power source device for a circuit breaker responsive to a detection means, said power source device comprising: rectification means for rectifying an output of the detection means; smoothing means for smoothing an output of said rectification means; a switching circuit for receiving said rectified output by way of said smoothing means for alternately applying said output to first and second output terminals; a dummy burden connected to said first output terminal of said switching circuit; a generating circuit connected to said second output terminal of said switching circuit for providing constant voltage to said circuit breaker; and a voltage monitoring circuit responsive to at least one of the output voltages of said generating circuit and said rectification means for controlling the position of said switching circuit; said dummy burden having a value substantially equal to a value of a total burden of said generating circuit and said circuit breaker.
Claim 2
Dependent Claim
150 words
A power source device for a circuit breaker responsive to a detection means, said power source device comprising: rectification means for rectifying an output of the detection means; smoothing means for smoothing an output of said rectification means; a switching circuit for receiving said rectified output by way of said smoothing means for alternately applying said output to first and second output terminals; a dummy burden connected to said first output terminal of said switching circuit; a generating circuit connected to said second output terminal of said switching circuit for providing constant voltage to said circuit breaker; and a voltage monitoring circuit responsive to at least one of the output voltages of said generating circuit and said rectification means for controlling the position of said switching circuit; said dummy burden having a value substantially equal to a value of a total burden of said generating circuit and said circuit breaker.
Claim 3
Dependent Claim
20 words
A power source device for a circuit breaker as defined in claim 1, wherein said dummy burden has an impedance.
Claim 4
Dependent Claim
27 words
A power source device for a circuit breaker as defined in claim 1, wherein said current detection means includes means for obtaining a signal for current measurement.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |