Direct-current bus voltage-sharing circuit and control method thereof

The invention belongs to the technical field of direct-current bus voltage sharing, and particularly discloses a direct-current bus voltage sharing circuit and a control method, and the circuit comprises a capacitor voltage division circuit which outputs an upper voltage and a lower voltage of a direct-current bus; the input of the first adder is the upper voltage and the lower voltage of the direct current bus, the output of the first adder is sequentially connected with the proportional element and the integral differential element, the output of the integral differential element is connected with the first input end of the second adder, and the second input end of the second adder is connected with zero potential; the output of the second adder is connected to the first input end of the comparator, the second output end of the comparator is connected with a set alternating current voltage, the output end of the comparator is pulled up, and an obtained output signal passes through the signal forward device