A bi-directional split-phase inverter circuit, comprising a positive direct current (DC) bus, a negative DC bus, a first DC filter capacitor unit, a second DC filter capacitor unit, M alternating current (AC) filter capacitor units, M bi-directional switch networks, a neutral wire and M live wires, where M is an integer, and M≥2;
- wherein
- the first DC filter capacitor unit is connected between the positive DC bus and the neutral wire, the second DC filter capacitor unit is connected between the negative DC bus and the neutral wire, and one of the AC filter capacitor units is connected between each one of the live wires and the neutral wire;
- each bi-directional switch network of the M bi-directional switch networks comprises an inverting coupling transformer, a filter inductor and multiple switch bridge arms;
- a DC positive terminal and a DC negative terminal of the switch bridge arm are connected correspondingly and respectively with the positive DC bus and the negative DC bus, a bridge arm midpoint of each switch bridge arm is connected with a winding of the inverting coupling transformer, a midpoint of the inverting coupling transformer is connected with a first terminal of the filter inductor, and a second terminal of the filter inductor is connected to one of the live wires;
- the live wires comprise a first live wire and a second live wire, and the bi-directional split-phase inverter circuit further comprises a controller;
- the controller comprises:
- a first voltage sampling unit, which is connected to the positive DC bus and performs voltage sampling on the positive DC bus to generate a first voltage sampling signal;
- a second voltage sampling unit, which is connected to the negative DC bus and performs voltage sampling on the negative DC bus to generate a second voltage sampling signal;
- a third voltage sampling unit, which is connected to the first live wire and performs voltage sampling on the first live wire to generate a third voltage sampling signal;
- a fourth voltage sampling unit, which is connected to the second live wire and performs voltage sampling on the second live wire to generate a fourth voltage sampling signal;
- a first current sampling unit, which is connected to the first live wire and performs current sampling on the first live wire to generate a first current sampling signal;
- a second current sampling unit, which is connected to the second live wire and performs current sampling on the second live wire to generate a second current sampling signal;
- a first comparison unit, which is connected to the first voltage sampling unit and to the first current sampling unit respectively, and is used for comparing the first voltage sampling signal and a first reference voltage signal, and generating a first feedback signal according to a comparison result and the first current sampling signal;
- a second comparison unit, which is connected to the second voltage sampling unit and to the second current sampling unit respectively, and is used for comparing the second voltage sampling signal and a second reference voltage signal, and generating a second feedback signal according to a comparison result and the second current sampling signal;
- a third comparison unit, which is connected to the third voltage sampling unit and to the second current sampling unit respectively, and is used for comparing the third voltage sampling signal and a third reference voltage signal, and generating a third feedback signal according to a comparison result and the second current sampling signal;
- a fourth comparison unit, which is connected to the fourth voltage sampling unit and to the first current sampling unit respectively, and is used for comparing the fourth voltage sampling signal and a fourth reference voltage signal, and generating a fourth feedback signal according to a comparison result and the first current sampling signal;
- a first control and wave generation unit, which is connected to the first comparison unit and to the second comparison unit respectively, and is used for generating a first control signal according to the first feedback signal and the second feedback signal;
- a second control and wave generation unit, which is connected to the third comparison unit and to the fourth comparison unit respectively, and is used for generating a second control signal according to the third feedback signal and the fourth feedback signal;
- a gating unit, which is connected to the first control and wave generation unit and to the second control and wave generation respectively, and is used for generating a PWM driving signal according to a control instruction, the first control signal and the second control signal;
- and
- a driver unit, which is connected to the gating unit and to the switch bridge arms of each bi-directional switch network respectively, and is used for generating a driving voltage of corresponding voltage value to each of the switch bridge arms according to the PWM driving signal, so as to drive the bi-directional switch network for rectification or AC conversion, and correspondingly outputting an AC signal or a DC signal of a preset voltage value.