Control method of phase shift soft switching converter

The invention discloses a control method of a phase shift soft switching converter. The control method includes the steps that first, an output current Ia of a rectifier filtration module connected with a payment edge of a main power transformer is collected; second, a load rated current is set to be aA, when a load current is bA, the converter connected with the main power transformer achieves zero-voltage switching of a main switching tube, when the load current is cA, an output current of the rectifier filtration module is in a critical make-and-break state, and when b<Ia<=c, the transformer is in phase-shifting control; when a<Ia<=b, the converter is controlled by PWM or controlled by PWM with the dropped frequency; when 0<=Ia<=a, the converter is controlled by PWM. The control method of the phase shift soft switching converter has high efficiency in the entire load section, system optimization is facilitated, the control function can be easily achieved, engineering design is made to be convenient, the implementation method is high in reliability, and engineering application is facilitated.