CT (Current Transducer) power circuit

The invention relates to a CT (Current Transducer) power circuit. The CT power circuit comprises a rectification circuit, an energy storage capacitor and a switch converting circuit and further comprises a PWM (Pulse Width Modulation) control circuit, wherein the energy storage capacitor is connected with the rectification circuit, the switch converting circuit is used for controlling the energy storage capacitor to charge and discharge, and the PWM control circuit is connected with the switch conversion circuit and is used for controlling the switch conversion circuit to be switched on or off. The CT power circuit disclosed by the invention controls the work of a current leakage circuit by a pulse width modulation manner, ensures the stability of the voltage through conduction time of a field effect tube in each period, reduces the consumption power of the field effect tube and has high efficiency.