Frequency conversion drive system of pulse width modulation in AC motor
An AC motor, pulse width modulation technology, applied in the direction of AC motor control, control system, electrical components, etc., can solve the problems of affecting cost and high price, and achieve the effect of saving cost, improving reliability and simplifying wiring.
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[0025] The AC motor pulse width modulation variable frequency drive system in the embodiment of the present invention is transformed on the basis of the prior art AC motor pulse width modulation variable frequency drive system.
[0026] The electrical block diagram of the prior art system is as follows figure 1 shown. On the three-phase frequency conversion control board, the AC (AC) input terminals 2 and 3 of the bridge rectifier BRD201 are respectively connected to the neutral line N and phase line L of the 220V (AC50HZ) single-phase AC power supply, and the direct current (DC) output terminals 1 and 4. Connect the filter circuit composed of the capacitor 225, and output the voltage of the DC bus VDD to the ground bus of about 300V. The inverter circuit consists of an A-phase bridge composed of insulated gate bipolar transistors IGBT201 and IGBT202, a B-phase bridge composed of IGBT203 and IGBT204, and a C-phase bridge composed of IGBT205 and IGBT206, which are connected be...
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