Soft switching inverting circuit and control method thereof
A technology of inverter circuit and control method, which is applied in the direction of electrical components, high-efficiency power electronic conversion, AC power input conversion to DC power output, etc., can solve the problems of increasing the additional cost of the system and control complexity, and achieve the purpose of overcoming reverse recovery Issues, Device Selection Reduction, Efficiency Enhancement Effects
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Embodiment 1
[0057] Such as figure 1 A soft-switching inverter circuit shown includes a control circuit 6, a DC power supply 1, and an inverter bridge 4 that converts DC power into AC power. The output terminal of the DC power supply 1 is connected to a voltage divider circuit 2 and is reversed through a DC bus. The variable bridge 4 provides power, and the inverter bridge 4 is connected to the control circuit 6, characterized in that: a resonance auxiliary circuit 3 is connected between the voltage divider circuit 2 and the inverter bridge 4, and the resonance auxiliary circuit 3 consists of two Auxiliary switches V and Tr, a single-phase rectifier bridge, a capacitor Cr, a diode D and an inductance Lr, the single-phase rectifier bridge is composed of diodes Dr1, Dr2, Dr3 and Dr4, the single-phase rectifier One AC end of the bridge is connected to the midpoint of the voltage divider circuit 2, the other AC end of the single-phase rectifier bridge is connected to the P pole of the DC bus, a...
Embodiment 2
[0076] Such as Figure 5 As shown, a soft switching inverter circuit is provided, which is used to drive a three-phase permanent magnet brushless DC motor 7. In this embodiment, on the basis of embodiment 1, the inductive load 5 is replaced with a specific three-phase permanent magnet brushless DC motor 7. The circuit structure of the remaining parts is the same as that of embodiment 1, and the working principle is the same as that of embodiment 1. I won't repeat it here. Here, the simulation is mainly performed on this embodiment. In the simulation, the three-phase permanent magnet brushless DC motor 7 works in the well-known star-shaped three-phase six-state. Its parameters are: rated power 40W, rated voltage 24V, number of poles 4, winding resistance per phase 0.95Ω, winding per phase The inductance is 0.829mH. In this embodiment, the parameters of the resonance auxiliary circuit 3 are: capacitance Cr=22nF, resonance inductance Lr=5uH. The voltage of the known DC power su...
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