Frequency converter and its control method
A technology of frequency converter and converter, which is applied in the direction of output power conversion device, high-efficiency power electronic conversion, AC power input conversion to AC power output, etc., can solve the problems of expensive and complex frequency converters, and minimize the physical effect of size
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[0023] Figure 4a shows a single-phase PWM frequency converter according to the present invention. As in the prior art (see Figure 1a ), which includes a rectifier bridge 10 for converting the AC voltage U of the supply line in Rectification into the DC voltage Udc of the DC intermediate circuit 11, and a three-phase converter bridge 12 for converting the intermediate circuit DC voltage Udc into a single-phase or three-phase variable frequency AC voltage U out . The frequency converter is connected to a small three-phase AC load such as a pump or fan motor 13 . The converter bridge is a full wave bridge having pulse width modulated semiconductor switches V11 to V16, such as IGBTs, and freewheeling diodes D11 to D16 connected in antiparallel to the semiconductor switches. By means of the PWM control unit 14 the semiconductor switches V11 to V16 are controlled with pulse width modulation. The rectifier bridge may be a full-wave diode bridge having the same voltage as the si...
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