Design of Inverter Circuit for Generating SPWM Control Wave Based on FPGA
In the case of DC power supply to AC motor,in order to reduce the harmonic effect of input AC on motor and to meet the needs of different motors for different input voltage's frequency,it is necessary to design an inverter circuit with ideal sine wave output and adjustable output voltage frequency.Considering the reduction of switching loss,it designed the single-phase bridge inverter main circuit,voltage rise and dead-zone time formation circuit,IR2110 driver circuit,the switch's protection circuit,which was based on a method of using FPGA and direct digital frequency synthesis technology to generate SPWM control wave.Finally,it made the actual object and used the oscilloscope to show the switch's driving signal and the out-put voltage waveform with different frequency.The test result verified the validity of the SPWM control wave generated by this design and could output ideal sine wave and the frequency of the output voltage could be adjusted and reached to 1 kHz,which can be applied to the occasions of various output voltage frequency,and then it provides a new idea for variable frequency speed regulation of DC powered motor.
FPGASPWM control waveinverter circuitIR2110 drive circuitdead-zone time
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