Driving circuit with an over-voltage protection device for modulating an electrical parameter of a driven device

摘要

A driving circuit with an over-voltage protection device for modulating an electrical parameter of a driven device includes at least a boost circuit, a signal processing circuit, an over-voltage protection device, a modulation device and a control circuit. The output terminal of the boost circuit is electrically coupled in series to a driven device, a transistor and a grounded feedback resistor sequentially, wherein the output terminal of the boost circuit is further electrically coupled to a voltage dividing circuit for outputting a voltage dividing signal. The signal processing circuit is provided for outputting a processing signal to the over-voltage protection device and the modulation device according to the voltage dividing signal and a modulation signal. The control circuit is provided for turning on the transistor or not according to an output signal of the over-voltage protection device and an output signal of the modulation device.

主权项

1. A driving circuit with an over-voltage protection device for modulating an electrical parameter of a driven device, comprising:
a boost circuit having an output terminal electrically coupled in series to the driven device, a transistor and a grounded feedback resistor sequentially, wherein the output terminal of the boost circuit is further electrically coupled to a grounded voltage dividing circuit for outputting a voltage dividing signal; a signal processing circuit provided for outputting a processing signal to the over-voltage protection device and a modulation device according to the voltage dividing signal and a modulation signal of a modulation signal source, wherein a phase of the processing signal is opposite to that of the modulation signal, and an amplitude of the processing signal corresponds to that of the voltage dividing signal; and a control circuit provided for turning on the transistor or not according to an output signal of the over-voltage protection device and an output signal of the modulation device; wherein if the processing signal exceeds a reference level of the over-voltage protection device, the transistor is turned off; if the processing signal does not exceed the reference level, the electrical parameter of the driven device is modulated according to the output signal of the modulation device.