Electricity: power supply or regulation systems – Remote sensing
Patent
1977-06-09
1979-02-20
Pellinen, A. D.
Electricity: power supply or regulation systems
Remote sensing
250326, 250578, 307146, 355 3CH, G03G 1502
Patent
active
041409620
ABSTRACT:
A high voltage power supply is regulated using a light dependent resistor. A feedback circuit from the load controls the input to a light emitting diode which is optically coupled to a light dependent resistor connected in series with the load. Increases in the load current tend to reduce illumination on the light dependent resistor, thereby increasing the resistance of that circuit element which reduces the load current. The converse is also true. Regulation may be applied to a D.C. power source or to an A.C. power source by developing a signal indicative of average current level and applying it to the light emitting diode to control the light dependent resistor. The high voltage power control of the invention is particularly useful in regulating corotron voltage levels in a xerographic reproduction device.
REFERENCES:
patent: 3199015 (1965-08-01), Lackey et al.
patent: 3471700 (1969-10-01), Presti
patent: 3604925 (1971-09-01), Snelling et al.
patent: 3805069 (1974-04-01), Fisher
Sokoloski et al, "An Automatic Voltage Control Circuit", Rev. Sci. Instrum., vol. 45, No. 2, Feb. 1974, pp. 295, 323-421.
Hudson, "Self Adjusting Corona Device", Xerox Disclosure Journal, vol. 1, No. 2, Feb. 1976, pp. 67, 250-326.
Pellinen A. D.
Xerox Corporation
Zalman Leonard
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