Method for inhibiting second harmonic current of preceding-stage inverter of two-stage inverter and control circuit of preceding-stage inverter of two-stage inverter
A control circuit and inverter technology, which is applied to electrical components, output power conversion devices, etc., can solve the problem of intermediate bus voltage drop and overshoot, low cut-off frequency of the front-stage DC converter voltage outer loop, and inverter output Voltage clipping and other issues
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[0025] attached figure 1 The structural block diagram of the two-stage inverter is given, which is composed of a Buck DC converter in the front stage and a cascaded inverter in the rear stage. Since the instantaneous output power of the rear-stage inverter contains pulsating power of twice the frequency of the output voltage, there is a second harmonic current of twice the frequency of the output voltage in the front-stage DC converter. The present invention proposes a second harmonic current suppression method based on the current inner loop of the band-pass filter for the front-stage Buck DC converter.
[0026] attached figure 2 The circuit schematic diagram of the simplified two-stage inverter is given. It can be seen from the figure that the second harmonic current at the input end of the inverter is shared by the inductance branch and the capacitance branch. In order to reduce the second harmonic current in the filter inductance branch, it is necessary to change the b...
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