Trapezoidal wave ringing current generating device adopting PWM control

The invention relates to a trapezoidal wave ringing current generating device adopting PWM control, which comprises a PWM controller, a low-pass filter, a voltage-current converter, an isolating circuit, a converting circuit and a full-bridge output circuit. The PWM controller is used for generating a PWM signal; the low-pass filter is connected with the PWM controller and converts the PWM signal into a low-voltage trapezoidal wave; the voltage-current converter is connected with the low-pass filter and generates a current signal based on the low-voltage trapezoidal wave; the isolating circuit is connected with the voltage-current converter and transmits the current signal in a low-voltage region to a high-voltage region; the converting circuit is connected with the voltage-current converter and converts the current signal into a voltage signal; and the full-bridge output circuit is connected with the converting circuit and loads the voltage signal to the end of a user line interface circuit. The adoption of