2 results about "Circulating current" patented technology

The invention discloses a high-frequency output AC-AC phase shift frequency conversion circuit, a motor, and a motor control system. The circuit comprises three groups of control switch groups which are connected between a three-phase power input end and a frequency conversion output end. The three-phase power input end is connected with a three-phase power supply, and three frequency conversion output connection ends of the frequency conversion output end are respectively connected with three power connection ends. The input end of each control switch group is connected with a power supply of one phase of the three-phase unit. Each control switch group is provided with three control switches in a parallel manner, wherein the three control switches are sequentially connected. Each frequency conversion output connection end is connected with the output end of one control switch of each control switch group. When each control switch group is connected, the phase shift of the three-phase power outputted by the frequency conversion output end is carried out clockwise or anticlockwise. The beneficial effects of the invention are that the circuit achieves the AC-AC frequency conversion operation (greater than 50Hz), and enlarges the AC-AC frequency conversion speed regulation range; the circuit is convenient to control, is reliable in operation, and also can achieve the operation (greater than 50Hz) in a circulating current system.