US3753077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct current chopper control circuit
Assignee: General Electric Co
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Filing: 1971-08-31
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Granted: 1973-08-14
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Expires: 1991-08-31
Abstract
Abstract A control circuit for controlling the effective power to a load from a power source of substantially constant direct current voltage including a first solid state switching device for placing the load and the power source in series. Circuitry including a commutating capacitor chargeable in a first direction, provides that capacitor discharge, initiated by the gating of a second solid state switching device, will terminate conduction of the first switching device. An inductance is provided in series with the load to develop a capacitor voltage in a second direction, related to load current, upon the termination of the conduction period. A series loop is provided including the capacitor, the inductor, and a third solid state switching device to reverse the polarity of the capacitor voltage to the first direction.
Inventors
- 👤 A Anderson
- 👤 C Konrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:11
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/06; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/125; H02M3/135; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
206 words
A system for controlling the amount of power delivered to a load from a direct current power source comprising: a first switching device having a first and a second end; an inductor coupled to one end of said first switching device; means for coupling said inductor and said first switching device in series circuit relationship between the load and the DC power source; a capacitor; a second switching device connected to said capacitor; means for coupling said capacitor and said second switching device in parallel circuit relationship with said inductor, and in series circuit relationship with said first switching device; a third switching device; means for coupling said third switching device between the intersection of said second solid state switching device and said capacitor, and said second end of said first solid state switching device; control means to selectively render said first, second and third switching devices conductive to allow charge to flow to said capacitor in a first direction through said inductor, to allow the charge thus accrued upon said capacitor to reverse by flowing in a second direction through said inductor, and to couple said reversely charged capacitor across said first switching device to cause said first switching device to assume a nonconductive state.
Claim 2
Independent Claim
206 words
A system for controlling the amount of power delivered to a load from a direct current power source comprising: a first switching device having a first and a second end; an inductor coupled to one end of said first switching device; means for coupling said inductor and said first switching device in series circuit relationship between the load and the DC power source; a capacitor; a second switching device connected to said capacitor; means for coupling said capacitor and said second switching device in parallel circuit relationship with said inductor, and in series circuit relationship with said first switching device; a third switching device; means for coupling said third switching device between the intersection of said second solid state switching device and said capacitor, and said second end of said first solid state switching device; control means to selectively render said first, second and third switching devices conductive to allow charge to flow to said capacitor in a first direction through said inductor, to allow the charge thus accrued upon said capacitor to reverse by flowing in a second direction through said inductor, and to couple said reversely charged capacitor across said first switching device to cause said first switching device to assume a nonconductive state.
Claim 3
Dependent Claim
19 words
The invention defined in claim 1, wherein said first, second, and third switching devices are gated solid state thyristors.
Claim 4
Dependent Claim
34 words
A circuit in accordance with the provisions of claim 2 in which the third switching device is rendered conductive by a gating signal initiated by sensing a reverse voltage across said second switching device.
Claim 5
Dependent Claim
31 words
The invention defined in claim 3, further including a second inductor coupled in series with said third switching device for limiting the rate of current increase through said third switching device.
References Cited (Backward Citations)
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US3594629A
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US3619753A
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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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |