Power electronic converters by Vodovozov V.

By Vodovozov V.

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The diagram of the inverter’s voltage and current is presented in Fig. 1 ,b. Commonly used inverters are neither perfect voltage source nor perfect current source inverters. They approximate more or less the properties of both in dependence of an inductance and capacitance of the circuit. 33 Control methods. Another classification refers to a method of control. There are a block control (other names are square-wave control and six-step control) principle and a pulse control principle. According to the first principle, ones opening and closing a semiconductor switch forms the positive or negative half period of the ac signal.

Commonly used inverters are neither perfect voltage source nor perfect current source inverters. They approximate more or less the properties of both in dependence of an inductance and capacitance of the circuit. 33 Control methods. Another classification refers to a method of control. There are a block control (other names are square-wave control and six-step control) principle and a pulse control principle. According to the first principle, ones opening and closing a semiconductor switch forms the positive or negative half period of the ac signal.

Thanks to zero-current switching, the losses are very low and the switches may be low-power devices. Moreover, the discontinuous current waveform results in high-speed voltage amplitude regulation. Summary. Significant decreasing of the thermal load and stress commutation processes lead to the growing of inverters reliability and frequency range. Nevertheless, most of designs of this type share common problems: • • first, the resonance inherently causes higher voltages than that of the supply, which place higher stresses on the power switches and the load; this can be overcome with addition of other switches and energy storage elements to absorb excess energy.

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