Electricity: power supply or regulation systems – External or operator controlled – Using an impedance as the final control device
Patent
1988-09-16
1989-08-15
Wong, Peter S.
Electricity: power supply or regulation systems
External or operator controlled
Using an impedance as the final control device
323902, 250205, G05B 2402
Patent
active
048578258
ABSTRACT:
A resistor has a resistance which is precisely controlled by means of a voltage control circuit. The controlled resistor is a radiation sensitive device which is optically coupled to a source of radiation connected to the output of an operational amplifier. A control circuit applies a controllable (preferably programmable) voltage, functionally related to a desired resistance of the controlled resistor, to the input of the operational amplifier. Also connected to the input of the operational amplifier is a feedback radiation sensitive resistor, which is also optically coupled to the radiation source. Preferably, the controlled radiation sensitive resistor and the feedback radiation sensitive resistor have substantially identical resistance characteristics. A compensation circuit is electrically connected between the input and output of the operational amplifier. The compensation circuit substantially eliminates cyclical variations in the resistance of the controlled resistor caused by a response lag between the radiation source control and the radiation sensitive resistors.
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Sokoloski et al., "An Automatic Voltage Control Circuit", Rev. Sci. Instrum., 2/74, p. 295.
Datatape Inc.
Noval William F.
Peckman Kristine
Wong Peter S.
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