Basic working principle
Three phase fully controlled rectifier bridge module
As shown in the figure, the rectifier bridge module is controlled by the control angle of the controller. When the control angle is 0 ° to 90 °, the rectifier bridge module is in the rectification state, and the average value of the output voltage is positive; when the control angle is 90 ° to 180 ° - γ (γ is the arc changing angle), the rectifier bridge module is in the inversion state, and the average value of the output voltage is negative.
In view of the fact that the smoothing reactor is usually connected at the load end of the rectifier bridge module, the load can be regarded as a constant current source. In addition, according to the EMI detection standard, in order to reduce the interference of power network impedance to the detection results, it is necessary to connect the linear impedance stabilization network (LISN) at the power network input end of the rectifier bridge module.
The main function of LISN is to reduce the interference to power network.
In view of the isolation effect of LISN, the power network terminal can be regarded as a power source with only fundamental potential and internal impedance. The equivalent circuit of the research object is shown in the figure.
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