Patent ID: 11955903
Assignee: SHENZHEN DOSO TECHNOLOGY LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A control method for alternating current, comprising: acquiring a present output current detected by a current detection circuit and a current rectified voltage detected by a voltage feedback circuit, acquiring a commutation signal detected by a commutation detection circuit, and outputting 4 conduction angle control signal to an upper bridge arm circuit of the alternating current and outputting a switch control signal to a lower bridge arm circuit of the alternating current according to the present output current and/or the present rectified voltage and based on the commutation signal; and turning on upper bridge elements in the upper bridge arm circuit and lower bridge elements in the lower bridge arm circuit according to a target commutation tune sequence, and adjusting on-off time of the upper bridge elements and the lower bridge elements to thereby adjust the present output current and/or the present rectified voltage, wherein the upper bridge elements are silicon controlled rectifiers or field effect transistors, and the lower bridge elements are silicon controlled rectifiers, diodes or field effect transistors: and
turning on the upper bridge elements in the upper bridge arm circuit and the lower bridge elements in the lower bridge arm circuit according to a target commutation time sequence, and adjusting on-off time of the upper bridge elements and the lower bridge elements to thereby adjust the current output current and the current rectified voltage comprises:
determining a delay ratio according to a current power demand value, delaying the commutation signal according to the delay ratio, and outputting the conduction angle control signal to the upper bridge arm circuit of the alternating current and the switch control signal to the lower bridge arm circuit of the alternating current based on the delayed commutation signal and the current output current and/or the current rectified voltage.