Voltage and temperature compensated linear rectifier
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorJulian C. Holmes
Life of this patent
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Abstract
An improved circuit for compensating for temperature and current variations n 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.
Claims5
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.
Dependencies are inferred from the claim text.