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Principle: The working principle of the bridge rectifier circuit is as follows: When E2 is positive half cycle, the forward voltage is applied to D1 and D3, D1 and D3 are turned on; the reverse voltage is applied to D2 and D4, and D2 and D4 are cut off. In the circuit, E2, D1, Rfz, and D3 are energized, and a half-wave rectified voltage is formed on Rfz, and when E2 is negative half-cycle, a forward voltage is applied to D2 and D4, and D2 and D4 are turned on; D3 plus reverse voltage, D1, D3 cut off. In the circuit, E2, D2, Rfz, and D4 are energized, and the rectified voltage of the other half of the upper and lower negative is also formed on Rfz. Repeating this way results in a full-wave rectified voltage on Rfz. The waveform is the same as the full-wave rectified waveform. It is not difficult to see from the figure that the reverse voltage of each diode in the bridge circuit is equal to the maximum value of the secondary voltage of the transformer, which is less than half of the full-wave rectifier circuit. Role: Bridge rectification is an improvement on diode half-wave rectification. Half-wave rectification utilizes the diode's unidirectional conduction characteristic. When the input is a standard sine wave, the output obtains the positive half of the sine wave and the negative half is lost. The bridge rectifier utilizes four diodes that are connected in pairs. The positive half of the input sine wave is that the two tubes are turned on to obtain a positive output; when the negative half of the sine wave is input, the other two tubes are turned on. Since the two tubes are reversed, the output still obtains a positive sine wave. Half part. The bridge rectifier is twice as efficient as the input sine wave than the half-wave rectification. Bridge rectification is the first step in converting AC power into DC power. The bridge rectifier is bridged by a plurality of rectifier diodes, and is packaged with external insulating plastic. The high-power bridge rectifier is encapsulated with a metal shell outside the insulating layer to enhance heat dissipation. The bridge rectifier has many varieties, excellent performance, high rectification efficiency and good stability. The maximum rectified current is from 0.5A to 50A, and the highest reverse peak voltage is from 50V to 1000V.