Isolation circuit with duty cycle feedback

Details Isolation circuit with duty cycle feedback Isolation circuit with duty cycle feedback

1977-09-26

1978-09-26

Dahl, Lawrence J.

Amplifiers

Modulator-demodulator-type amplifier

330207A, 330251, H03F 338

Patent

active

041174119

ABSTRACT:
An isolation circuit with duty cycle feedback is disclosed which includes an operational amplifier with capacitive coupled negative feedback such that its output voltage varies to maintain its input terminals at the same potential, and which output is connected to the control terminal of a voltage controlled oscillator which generates a square wave voltage in which the ratio of ON time to the total period is directly related to the voltage from the operational amplifier. The output pulses of the voltage controlled oscillator are fed through a resistor to the negative input terminal of the operational amplifier. The output pulses from the oscillator are also fed through a driver transistor to control the input of an opto-coupler. The output from the opto-coupler passes through an amplifier to produce a square wave voltage with the same ON time ratio as the voltage controlled oscillator. The average value of this square wave voltage is obtained by a low pass filter and is directly proportional to the input analog voltage.

REFERENCES:
patent: 3430125 (1969-02-01), Povenmire et al.
patent: 3976955 (1976-08-01), Hamada
patent: 4050028 (1977-09-01), Vosteen

Affiliated with

Also associated with

Rating

Isolation circuit with duty cycle feedback does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Isolation circuit with duty cycle feedback, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Isolation circuit with duty cycle feedback will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2092646