Abstract: A current sharing control method and an AC-DC conversion system are provided. The method is applied to a current sharing controller configured to control an operating state of an AC-DC converter comprising at least two rectification units. Each of the at least two rectification units is in a bridge topology combined with an LLC resonant tank. The method comprises: determining a target adjustment phase based on the absolute values of instantaneous values of three-phase input voltages of the at least two rectification units; determining a target duty cycle of the target adjustment phase in each of the rectification units based on the current sampling values of the at least two rectification units; and adjusting, based on the target duty cycle of the target adjustment phase in each of the rectification units, a duty cycle of a control signal for a switch in each of the rectification units.

Abstract: A current sharing control method and an AC-DC conversion system are provided. The method is applied to a current sharing controller configured to control an operating state of an AC-DC converter comprising at least two rectification units. Each of the at least two rectification units is in a bridge topology combined with an LLC resonant tank. The method comprises: acquiring current sampling values of the at least two rectification units; determining a target phase shift angle of each of the rectification units according to the current sampling values, wherein the target phase shift angle is used to indicate a duration of an input voltage of the LLC resonant tank being in a zero-level state; controlling, according to the target phase shift angle of each of the rectification units, a control signal of a target switch in a bridge topology of each of the rectification units to perform phase shifting.

Abstract: The present disclosure provides a three-phase single-stage AC-DC converter and control method and apparatus therefor, with which conversion efficiency and power density of the converter are improved. The converter includes a three-phase matrix switching circuit, a resonant circuit, an isolation circuit and a rectifier circuit. Three-phase matrix switching circuit is connected to three-phase AC power and includes three switch branches, each including an upper bridge arm and a lower bridge arm. Each arm includes one bidirectional switch component or two switch components connected in series in reverse. Resonant circuit includes a resonant capacitor, a resonant inductor and an excitation inductor which are connected in series between a common endpoint of upper bridge arms and a common endpoint of lower bridge arms. Isolation circuit is connected with resonant circuit and rectifier circuit. Rectifier circuit includes at least two switch components, and is connected with isolation circuit and a load.