bridge rectifier
Bridge rectifier is the most commonly used circuit for rectifying by using the unilateral conductivity of diode, which is often used to convert alternating current into direct current.
principle
The working principle of bridge rectifier circuit is as follows: when E2 is a positive half cycle, DC voltage is applied to D 1 and D3, and D 1 and D3 are turned on; A reverse voltage is applied to D2 and D4, and D2 and D4 are turned off. In the circuit, E2, D 1, Rfz and D3 are powered on, forming a positive half-wave rectified voltage on Rfz, and E2 is a negative half cycle.
D2 and D4 apply DC voltage, and D2 and D4 are turned on; Reverse voltage is applied to D 1 and D3, and D 1 and D3 are turned off. E2, D2, Rfz and D4 circuits are formed, and another half-wave rectified voltage is formed on Rfz. If this process is repeated, a full-wave rectified voltage will be obtained on Rfz. Its waveform diagram is the same as full-wave rectification. It is not difficult to see from the figure that the reverse voltage borne by each diode in the bridge circuit is equal to the maximum secondary voltage of the transformer, which is half smaller than that of the full-wave rectifier circuit.
Selection and application
It is particularly important to point out that diodes, as rectifier components, should be selected according to different rectifier modes and load sizes. If the choice is improper, it may not work safely or even burn the pipe; Or overqualified, wasting resources.
References:
Bridge rectifier _ Baidu Encyclopedia
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