Isolated high voltage controller

Details Isolated high voltage controller Isolated high voltage controller

1983-06-27

1985-10-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

330 59, 307311, G02B 2700

Patent

active

045462623

ABSTRACT:
The use of pulse width modulation rather than analog excitation to control the resistance of a light emitting diode--photoresistor pair is described. In particular, for two LED/LDR opto-isolators in a totem pole configuration, the duty cycle of the first opto-isolator is arranged to equal 1 minus the duty cycle of the second opto-isolator. Thus, both opto-isolators are always active resulting in the ratiometric output being proportional to the duty cycle, and the output impedance being constant.

REFERENCES:
patent: 3590251 (1971-06-01), Vosteen
patent: 3629590 (1971-12-01), Case
patent: 3893037 (1975-07-01), Herbert
patent: 4292551 (1981-09-01), Kolmann
patent: 4339670 (1982-07-01), Guajardo

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