1) Classification of inverter circuit - According to the nature of the DC side power supply, the DC side is the voltage source: the voltage type inverter circuit - also known as the voltage source type inverter circuit, the DC side is the current source current type inverter circuit - Also known as current source type inverter circuit 2) Characteristics of voltage type inverter circuit (1) The DC side is a voltage source or a parallel large capacitor, and the DC side voltage is substantially free of ripple.
(2) The output voltage is a rectangular wave, and the output current varies depending on the load impedance.
(3) Reactive power is required when the load is resistive. In order to provide a channel for the non-functional amount of feedback from the AC side to the DC side, the inverter bridges the feedback diodes in parallel with each arm. 3) Characteristics of the current-type inverter circuit (1) The DC-side series large inductance, the current is basically pulsation-free, equivalent to the current source (2) The AC output current is a rectangular wave, independent of the load impedance angle. The output voltage waveform and phase vary depending on the load.
(3) The DC side inductance acts as a buffer without function, and it is not necessary to give the switching device an anti-parallel diode.
(4) In the current-type inverter circuit, the circuit using the half-controlled device is still widely used.
(5) The commutation mode has load commutation and forced commutation.
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