81003-269-51-R Rectifier unit board A-B

81003-269-51-R Rectifier unit board A-B.The rectifier unit is mainly composed of three pairs (six) of diodes or thyristors, which act like check valves used in fluid piping systems, allowing current to flow in only one direction, as shown by the arrow of the diode symbol in the figure. Whenever the phase A voltage (voltage similar to the pressure in a fluid piping system) is positive and higher than the phase B and C voltages, then the phase A positive side diode will open and allow current to flow; In phase A and C, the diode on the positive side of phase B is turned on, and the diode on the positive side of phase A and C is turned off; according to the same principle, we can also infer the on-off of the three diodes on the negative side when the voltage of each phase is negative state. In this way, as the three-phase AC polarity and amplitude of the input side A, B, and C alternately transform, the diodes in the rectification circuit are sequentially turned on and off one by one, and we get a series from the output side of the rectification circuit. Direct current consisting of six current “pulses”. This “six-pulse rectification” has almost become the standard configuration of current rectification modules.