POWER CONVERSION CIRCUIT AND METHOD FOR CONTROLLING DIRECT CURRENT-ALTERNATING CURRENT CIRCUIT

摘要

A power conversion circuit includes: an AC-DC circuit, a direct current-alternating current DC-AC circuit, and a first filter capacitor. The DC-AC circuit includes: a third bridge arm, a fourth bridge arm, a first inductor, a second inductor, a first switch transistor, and a second switch transistor, a second end of the first inductor is connected to a first end of the first switch transistor, a second end of the first switch transistor is connected to the direct current bus, a first end of the second inductor is connected to a connection point of two switch transistors included by the fourth bridge arm, a second end of the second inductor is connected to a first end of the second switch transistor, and a second end of the second switch transistor is connected to the direct current bus.

主权项

1. A power conversion circuit, wherein the power conversion circuit comprises: an alternating current-direct current AC-DC circuit, a direct current-alternating current DC-AC circuit, and a first filter capacitor, wherein the AC-DC circuit, the DC-AC circuit, and the first filter capacitor are connected in parallel on a direct current bus;
the AC-DC circuit comprises: a power factor correction PFC circuit, a first bridge arm, and a second bridge arm; the PFC circuit, the first bridge arm, and the second bridge arm are connected in parallel on the direct current bus, wherein the first bridge arm comprises two diodes that are connected in series in a same direction, the second bridge arm comprises two diodes that are connected in series in a same direction, a connection point of the two diodes comprised by the first bridge arm is connected to a live wire of an alternating current source, and a connection point of the two diodes comprised by the second bridge arm is connected to a neutral wire of the alternating current source; two ends of the second bridge arm are separately connected to two ends of the first filter capacitor; the DC-AC circuit comprises: a third bridge arm, a fourth bridge arm, a first inductor, a second inductor, a first switch transistor, a second switch transistor, a second filter capacitor, and a load resistor; and the third bridge arm and the fourth bridge arm are connected in parallel on the direct current bus, wherein the third bridge arm comprises two switch transistors that are connected in series in a same direction, the fourth bridge arm comprises two switch transistors that are connected in series in a same direction, a first end of the first inductor is connected to a connection point of the two switch transistors comprised by the third bridge arm, a second end of the first inductor is connected to a first end of the first switch transistor, a second end of the first switch transistor is connected to the direct current bus, a first end of the second inductor is connected to a connection point of the two switch transistors comprised by the fourth bridge arm, a second end of the second inductor is connected to a first end of the second switch transistor, a second end of the second switch transistor is connected to the direct current bus, the second end of the first inductor and the second end of the second inductor are further separately connected to two ends of the second filter capacitor, the two ends of the second filter capacitor are further separately connected to two ends of the load resistor, and one end of the second filter capacitor is further connected to the neutral wire of the alternating current source.