Patent US3947706A successfully refreshed from Google Patents.
US3947706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage and temperature compensated linear rectifier
Assignee: United States Department of the Navy
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Filing: 1975-04-30
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Granted: 1976-03-30
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Expires: 1995-04-30
Abstract
Abstract An improved circuit for compensating for temperature and current variationsn rectifier circuits used for converting alternating current to a proportional direct current, particularly at low voltages. A separate rectifier to be used as a circuit standard is maintained in close thermal proximity to other rectifiers as part of the conversion circuit. A voltage proportional to that across the standard is applied as a bias to a terminal of the circuit rectifiers to automatically compensate for temperature and current changes in the circuit and thereby provide a more accurate rectification of an input voltage.
Inventors
- 👤 Julian C. Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:40
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
137 words
A rectifier compensating circuit comprising: at least one diode rectifier having a first and second terminal; a standard diode rectifier, having first and second terminals, said first terminal being coupled in series to the second terminal of said at least one diode rectifier; a first resistor coupled in series to the second terminal of said standard diode rectifier; a second resistor coupled in series with said first resistor and to ground; an operational amplifier having a positive input coupled to the junction between said first and second resistor, a negative input coupled to the first terminal of said standard diode rectifier, and an output coupled to the second terminal of said standard diode rectifier; and means for coupling an alternating source of input voltage between ground and said first terminal of said at least one diode rectifier.
Claim 2
Dependent Claim
137 words
A rectifier compensating circuit comprising: at least one diode rectifier having a first and second terminal; a standard diode rectifier, having first and second terminals, said first terminal being coupled in series to the second terminal of said at least one diode rectifier; a first resistor coupled in series to the second terminal of said standard diode rectifier; a second resistor coupled in series with said first resistor and to ground; an operational amplifier having a positive input coupled to the junction between said first and second resistor, a negative input coupled to the first terminal of said standard diode rectifier, and an output coupled to the second terminal of said standard diode rectifier; and means for coupling an alternating source of input voltage between ground and said first terminal of said at least one diode rectifier.
Claim 3
Dependent Claim
34 words
The circuit of claim 1 wherein the ratio of said second resistor to said first resistor is equal to N where N equals the number of rectifiers forming said at least one diode rectifier.
Claim 4
Dependent Claim
33 words
The circuit of claim 2 wherein said standard diode rectifier is coupled in thermal proximity with said at least one diode rectifier such that the temperature of each is maintained substantially the same.
Claim 5
Dependent Claim
20 words
The circuit of claim 3 wherein said at least one diode rectifier comprises a plurality of serially connected diode rectifiers.
Claim 6
Dependent Claim
29 words
The circuit of claim 4 wherein the first terminal of each diode rectifier is a cathode terminal and the second terminal of each diode rectifier is an anode terminal.
References Cited (Backward Citations)
US3329896A
Cited
US3800169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |