Voltage doubler rectifier circuit diagram - Solutions - Huaqiang Electronic Network

GW MB10F 0.8A 1000V rectifier bridge

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Double voltage rectifier circuit diagram: If the power quality requirements are not very high, and the power requirements are not very large, but the relatively high voltage is not easy to obtain. For example, 1200 volts, it is not easy to buy the corresponding transformer. At this time, it is not annoying to consider using a voltage doubler rectifier circuit. Like some high voltages in an oscilloscope, this circuit is used. The following is a simple five-times voltage circuit, which requires higher voltages and so on.

Five-fold voltage rectifier circuit (AC input, DC output)

Figure 5-14 is a double voltage rectification circuit. The circuit consists of a transformer B, two rectifier diodes D1, D2 and two capacitors C1, C2. Its working principle is as follows:

When e2 is positive half cycle (upper positive and negative), diode D1 is turned on, D2 is turned off, current is charged to C1 through D1, and the voltage on capacitor C1 is charged to the peak close to e2 . And remains basically unchanged. When e2 is negative half cycle (upper negative and positive), diode D2 is turned on and D1 is turned off. At this time, the voltage on Cl is Uc1= Adding in series with the power supply voltage e2 , the current charges the capacitor C2 via D2, and the charging voltage Uc2= e2 peak +1.2E2≈ . Repeatedly charged, the voltage on C2 is basically It is. Its value is twice the voltage of the transformer's power stage, so it is called a double voltage rectifier circuit.

In the actual circuit, the voltage on the load is Usc = 2X1.2E2. The highest reverse voltage experienced by rectifier diodes D1 and D2 . DC voltage Uc1 on the capacitor , Uc2= . Circuits and selection components can be designed accordingly.

On the basis of the double voltage rectification circuit, a rectifier diode D3 and a filter capacitor C3 are added to form a triple voltage rectifier circuit, as shown in Figure 5-15. The working principle of the triple voltage rectifier circuit is: in the first half cycle and the second half cycle of e2 , the same as the double voltage rectifier circuit, that is, the voltage on C1 is charged. , the voltage on C2 is charged close to . When the third half is over, D1 and D3 are turned on, D2 is turned off, the current is charged by C1 except D1, and C3 is charged by D3. The charging voltage Uc3 on C3 = e2 peak + Uc2 - Uc1≈ Thus, on RFZ,, the DC voltage Usc=Uc1i+Uc3 can be output. + =3√2 E. , to achieve triple voltage rectification.

In the actual circuit, the voltage on the load Ufz ≈ 3x1.2E2 rectifier diode D3 is also the highest reverse voltage The DC voltage on the capacitor is .

In this way, by adding multiple diodes and the same number of capacitors, it is possible to form a multiple voltage rectifier circuit, see Figure 5-16. When n is an odd number, the output voltage is taken from the upper end: when n is an even number, the output voltage is taken out from the lower end.

It must be stated that the voltage doubler rectifier circuit can only work when the load is light (ie, Rfz is large and the output current is small), otherwise the output voltage will decrease. The higher the voltage doubler, the more obvious the increase in output voltage due to the increase in load current.

The diode used for the voltage doubler rectifier circuit should have a maximum reverse voltage greater than . A high-voltage silicon rectifier stack is available, and its series model is 2DL. For example, 2DL2/0.2 means that the highest reverse voltage is 2 kV, and the average rectified current is 200 mA. The capacitor used in the voltage doubler rectifier circuit has a relatively small capacity and does not require an electrolytic capacitor. The withstand voltage of the capacitor is greater than 1.5x It is safe and reliable in use.