This article describes a method of solving isolated control problems by shifting the control frequency up with the TimerBlox PWM Generator.
The text presents a strategy to solve isolated control problems by converting low-frequency PWM signals (e.g., 1kHz) from embedded controllers into higher frequencies (e.g., 250kHz). This allows the signals to be properly coupled across small signal isolation transformers, which cannot handle low frequencies effectively. The LTC6992-2 is used as a voltage-controlled PWM generator in this circuit.
The circuit converts a 1kHz PWM signal to a 250kHz signal.
The device varies the output clock duty cycle from 5% to 95%.
The optional circuit speeds up the response time by a factor of 10.