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Pwm optocoupler amplification
The method involves converting the analog signal of interest into PWM and then using an opto-coupler to send it to the other side (where low-pass filtering can be used to get back the analog signal). PWM can be created with a ramp (sawtooth) signal connected to a comparator. The PWM power amplifier / power optocoupler of the OK10 series was specially designed for the current amplification of PWM signals and is used to control and regulate the power of pulsed loads such as DC motors, heaters and valves. Optocouplers are “fail safe” in that if subjected to voltages higher. I have a circuit with two different ground levels. The diagram here. The MAX5974_ provide control for wide-input-voltage, active-clamped, current-mode PWM, forward converters in Power-over-Ethernet (PoE) powered device (PD) applications.
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