Less-switch five-power level voltage source type inverter and control method thereof
A technology of voltage source type and inverter device, applied in the field of multi-level voltage source type inverter, can solve the problems of complex topology structure and control method of multi-level power conversion circuit, achieve easy maintenance and repair, simple control method, The effect of reducing the amount of use
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specific Embodiment approach 1
[0018] Specific Embodiment 1: This embodiment is described in conjunction with accompanying drawing 1. This embodiment consists of rectifying full bridge B, electrolytic capacitor C1, electrolytic capacitor C2, IGBT1 (insulated gate bipolar transistor), IGBT2, IGBT3, IGBT4, IGBT5, IGBT6, Inductor L, DSP circuit 1, drive / photoelectric isolation circuit 2;
[0019] The two AC input terminals of the rectified full bridge B are connected to the output terminal of the AC power supply, the positive terminal of the rectified full bridge B and the positive terminal of the electrolytic capacitor C1 are connected to the collector of IGBT1, the negative terminal of the electrolytic capacitor C1 and the emitter of IGBT2 are connected to the electrolytic capacitor The positive terminal of C2, the collector of IGBT2, the emitter of IGBT1, and the collector of IGBT3 are connected to the collector of IGBT5, the emitter of IGBT3 and the collector of IGBT4 are connected to one end of the inducto...
specific Embodiment approach 2
[0028] Specific embodiment 2: This embodiment is described in conjunction with accompanying drawing 1. This embodiment adds a current transformer L1, a current transformer L2, and a current overload protection circuit 3 on the basis of the specific embodiment 1;
[0029] The current transformer L1 is set on the negative terminal of the rectified full bridge B, the current transformer L2 is set on the second output end of the inverter device, and the signal output end of the current transformer L1 and the signal output end of the current transformer L2 are respectively connected to The two signal input terminals of the current overload protection circuit 3 and the control signal output terminal of the current overload protection circuit 3 are connected to the current overload protection control signal input terminal of the DSP circuit 1 .
[0030] This implementation mode can realize the protection of current overload and current impact of IGBT1, IGBT2, IGBT3, IGBT4, IGBT5, IGBT...
specific example
[0032] Specific example: Select Fuji's IGBT1-6 modules as 2MBI25L-120 for the power switch tube, the maximum pressure is 1200 volts, and the maximum overcurrent is 25 amps. The drive / photoelectric isolation circuit 2 mainly adopts the M57962 of Mitsubishi Corporation, and builds the drive and protection circuit on this basis. The filter inductance L of the inverter is 10mH, and the DC side voltage of the rectified full bridge B is Ed c1 =E dc2 =150V, the switching frequency is 1075Hz. The core of the control unit of DSP circuit 1 is composed of TMS320F2812. Combined with Figure 3 and Figure 4, there are five different level outputs (0, ±150V, ±300V). And do frequency spectrum analysis on it, calculate the 19th harmonic, get its THD=9.50% after calculation, its harmonic mainly concentrates on the 15th and 17th. It can be seen from Figure 4 that the load resistor voltage after the filter inductor is relatively close to sinusoidal. Do frequency spectrum analysis on the volta...
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