HIGH-PRECISION ISOLATION CONVERTER AND CONTROL METHOD THEREOF

원문 (중국어)

A high-precision isolation converter and a control method thereof are provided. The isolation converter includes a half-bridge switching circuit, where when a switch tube in the half-bridge switching circuit is turned on, an excitation inductor, a resonant inductor, a resonant capacitor and the switch tube form a resonant network. A detection error amplifier circuit detects a node voltage of a high-potential end of a primary winding of a transformer to obtain a first detection signal representing output voltage information, and performs error amplification on the first detection signal and a preset reference voltage to obtain a compensation signal. A frequency and duty cycle adjustment circuit obtains a switching control signal according to the compensation signal, an inductor current sampling signal and a preset frequency signal to control a switching on and off of the half-bridge switching circuit, thereby controlling an output signal of the isolation converter to be stable.