The main circuit of Shanxi frequency converter is composed of three parts: filter circuit, inverter and rectifier. Their functions and characteristics are as follows:
1. Filter circuit: The DC voltage rectified by the rectifier contains a pulsating voltage with 6 times the frequency of the power supply, and the pulsating current generated by the inverter also changes the DC voltage. In order to suppress voltage fluctuation, inductance and capacitance are used to absorb pulsating voltage (current). When the capacity of the device is small, if the power supply and the main circuit have a surplus, the inductance can be omitted and a simple filter loop can be adopted.
2. Inverter: Contrary to rectifier, inverter converts DC power into AC power with required frequency, and three-phase AC output can be obtained by turning on and off six switching devices in a determined time.
3. Rectifier: Diode converters are more widely used, which convert power frequency power supply into DC power supply. Two groups of transistor converters can also be used to form a reversible converter, which can be regenerated because of its reversible power direction.
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