Bridge rectifier circuit characteristics, principle, what is the role of single phase bridge rectifi

Are you asking about single-phase bridge rectifier circuit or three-phase bridge rectifier circuit?

Bridge rectifiers utilize diodes.

The unidirectional conductivity is the most commonly used circuit for rectification, and is commonly used to place alternating current.

Convert to direct current.

If you are getting started, you should first learn single-phase bridge rectifier circuits

Principle: The working principle of the bridge rectifier circuit is as follows: when E2 is a positive half-cycle, add forward voltage to D1 and D3, and Dl and D3 are turned on; Add reverse voltage to D2 and D4, and cut off D2 and D4.

The circuit is composed of E2, D1, RFZ and D3 energizing circuits, and a half-wave rectification voltage of positive and negative is formed on the RFZ, and when E2 is negative for half a cycle, a positive voltage is added to D2 and D4, and D2 and D4 are turned on; Add reverse voltage to D1 and D3, and cut off D1 and D3. The circuit constitutes an energizing circuit of E2, D2RFZ and D4, and also forms a positive and negative rectification voltage on the RFZ for the other half of the wave. How it works.

Repeating this results in a full-wave rectification voltage on the RFZ. The waveform is the same as the full-wave rectifier waveform. It is not difficult to see from Figure 5-6 that the reverse voltage experienced by each diode in the bridge circuit is equal to the maximum value of the transformer's secondary voltage, which is higher than that of the full-wave rectifier circuit.

Half smaller. Reference**.

The working principle of the thyristor single-phase bridge fully controlled rectifier circuit.

Single-phase bridge rectifier circuit is a bridge rectifier, English bridge rectifiers, also known as rectifier bridge stack, is the most commonly used circuit that uses the unidirectional conductivity of diodes to rectify, and is commonly used to convert alternating current into direct current.

Half-wave rectification uses the unidirectional conduction characteristic of the diode, and when the input is a standard sine wave, the positive half of the sine wave is obtained from the output, and the negative half is lost.

The bridge rectifier lead bridge rectifier utilizes four diodes, which are docked in pairs. The positive part 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, and since the two tubes are reversed, the output still gives the positive half of the sine wave.

Bridge rectifiers use the input sine wave twice as efficiently as half-wave rectification. Bridge rectification is the first step in the conversion of alternating current to direct current.

The bridge rectifier is made of multiple rectifier diodes as bridge connections and encapsulated with insulating plastic, and the high-power bridge rectifier is encapsulated with a metal shell outside the insulation layer to enhance heat dissipation. There are many varieties of bridge rectifiers, excellent performance, high rectification efficiency, good stability, the maximum rectification current is from 50A, and the maximum reverse peak voltage is from 50V to 1000V.

The bridge rectifier circuit can also be regarded as a kind of full-wave rectifier circuit, and the transformer winding is connected to four diodes according to the method shown in the above figure. D 1 D 4 is four identical rectifier diodes, connected into a bridge form, so it is called a bridge rectifier circuit. The diode is used to guide the secondary output to the load even in the negative half cycle.

As can be seen from the figure, the current guided by D1 and D3 passes through RL from top to bottom during the positive half cycle, and the current guided by D2 and D4 also passes through RL from top to bottom during the negative half cycle, so as to achieve full-wave rectification. In this structure, if the same DC voltage is output, the transformer secondary winding only needs half the winding compared to the full-wave rectification, but if the same amount of current is to be output, the wire diameter of the winding should be thickened accordingly. As for the pulsation, it is exactly the same as the full-wave rectifier circuit mentioned earlier.

The advantages of the bridge rectifier circuit are that the output voltage is high, the ripple voltage is small, the maximum reverse voltage borne by the tube is low, and at the same time, because the power transformer has a current supply load in the positive and negative half a week, the power transformer is fully utilized, and the efficiency is high.

Because the output voltage of the rectifier circuit contains a large pulsation component. In order to keep the pulsation component as low as possible, and on the other hand, to keep the DC component as much as possible, so that the output voltage is close to the ideal DC, this measure is filtering. Filtering is usually achieved using the energy storage of capacitors or inductors.

The bridge rectification is to use 4 diodes to be annularly connected, and the positive poles of the two diodes are connected together to output the DC negative pole; The other two negative electrodes are connected together to output the DC positive electrode; Then connect the positive and negative poles at the other end of the diode together and connect them to the AC input.

The working principle of the bridge rectifier circuit is as follows: when E2 is a positive half cycle, add forward voltage to D1 and D3, and D1 and D3 are turned on; Add reverse voltage to D2 and D4, and cut off D2 and D4.

In the circuit, the architect instructs the energizing circuit of E2, D1, RFZ and D3, and forms a positive and negative half-wave rectification voltage on the RFZ, and when E2 is negative for half a cycle, the forward voltage is added to D2 and D4, and D2 and D4 are turned on; Add reverse voltage to D1 and D3, and cut off D1 and D3.

The circuit constitutes an energizing circuit of E2, D2RFZ and D4, and also forms a positive and negative rectification voltage on the RFZ for the other half of the wave.

This repeated masking results in a full-wave rectification voltage on the RFZ. The waveform is the same as the full-wave rectifier waveform. It is not difficult to see from the diagram that the reverse voltage experienced by each diode in the bridge circuit is equal to the maximum value of the transformer's secondary voltage, which is half smaller than that of the full-wave rectifier circuit.

1.Bridge rectifier circuits The average current flowing through each diode is: times the average load current. (The average is the average current that passes through a cycle). Each diode works only in half a cycle.

2.If the output of the single-phase bridge rectifier electrosensitive silver circuit does not have electrolytic capacitor filtering, the output voltage is several times of the transformer's secondary voltage (RMS). The DC voltage output after rectification has a poor degree of smoothness (the waveform is pulsating DC), and the stability is relatively poor.

3.If the output of the single-phase bridge rectifier circuit is filtered with electrolytic capacitors, the output voltage is multiple of the secondary voltage (RMS) of the transformer. The output DC voltage after rectification filtering has a good degree of smoothness (the waveform is close to a straight line), but its stability is still relatively poor.

4.If the output of the single-phase bridge rectifier circuit is equipped with an electrolytic capacitor filter and a voltage regulator circuit, the output voltage is determined by the voltage regulator circuit. After rectification, filtering, voltage stabilization (the voltage regulator tube plays a role in voltage stabilization in the circuit), the output DC voltage, the smoothness is good (the waveform is a straight line), and its stability is relatively good.