Patent ID: 11894782
Assignee: SANTAK ELECTRONIC (SHENZHEN) CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 10:
11. The PWM method according to claim 10, wherein each by-pass switch is a TRIAC, and the PWM method further comprises a step of:
when the power transistors T1, T2, T3 and T4 of at least one of the CHB rectifier circuits are in the non-PWM time periods at the same time, and the alternating currents flowing through the power transistors T2 and T4 are in time periods during which the amplitude monotonically decreases to cross zero, controlling the TRIAC of each CHB rectifier circuit to be switched on to bypass the CHB rectifier circuit.