The rectification principle and waveform set the potential of the transformer secondary coil as the effective value of the phase potential. During the positive half of e, the potential at point a at the upper end of the secondary winding of the transformer is higher than the potential at point b at the lower end of the transformer. The end of a flows through the load R through Z and returns to the end of b, as shown by the solid arrows in FIG. 2. During the negative half of e, the potential at point a is lower than the end at b, Z is turned on, and Z is turned off. The current flows from the b end of the transformer through Z to the load R and back to the a end, as shown by the dotted arrow in FIG. 2. Regardless of whether e is a positive half cycle or a negative half cycle, the current can flow through the load from the left to the right through the corresponding two diodes respectively, and a pulsating current with a constant direction and a varying size is obtained on the load.
The selection of silicon components The rational selection of silicon components is mainly from the perspective of economics and reliability. The selection of silicon components refers to the reasonable selection of silicon component models. Among them, the main rated indicators are reverse working peak voltage U and rated positive The reverse peak voltage experienced by the silicon element in the selection circuit that reverses the operating peak voltage U to the average current I2.1 is related to the type of rectifier circuit used and the power supply voltage. After the form of the rectifier circuit is determined, in order to ensure that the silicon component will not be damaged when the power supply voltage fluctuates and instantaneous overvoltage occurs, the reverse working peak voltage of the silicon component is usually selected as the maximum reverse voltage actually received by the silicon component in the circuit 1.52 times. That is: U2.2 Silicon element rated forward average current I selection In the rectifier circuit, the current through the silicon element is not pure DC, but pulsating DC containing AC components. In this case, it is the effective value of the current that heats up the silicon element.
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