Rectifier circuit

Abstract

The invention relates to a rectifier circuit, comprising two inductors L1 and L2, a first switch element Q1, a second switch element Q2, a third switch element Q3, three diodes D3, D4 and D5, and two capacitors DC1 and C2, wherein one end of the inductor L1 is connected with a fire wire and the other end thereof is connected with the cathode of the diode D3, one end of the capacitor DC1 and one end of the third switch element Q3 simultaneously by the first switch element Q2; the other end of the inductor L1 is connected with the anode of the diode D4, the other end of the capacitor DC1 and the anode of the diode D5 simultaneously by the second switch element; the anode of the diode D3 and the cathode of the diode D4 are connected with the zero line simultaneously; the cathode of the diode D5 is connected with the other end of the third switch element Q3; furthermore, the inductor L2 is connected in series with the capacitor C2 and is then connected in parallel to the diode D5. The rectifier circuit can greatly reduce the harmonic current and improve the circuit power factor; furthermore, compared with the output voltage, the input voltage can be output in a reducing or boosting way.

Description

technical field [0001] The invention relates to rectification technology, more specifically, to a rectification circuit. Background technique [0002] Electronic products cover all areas of human life, and when people use electronic products in daily life, they usually need to use direct current, and most of the power supply is alternating current. Therefore, in many places, it is necessary to convert alternating current into direct current, that is, to rectify alternating current. At present, the commonly used rectification circuit is a rectification bridge stack composed of four diodes, or a thyristor rectification and voltage regulation. see figure 1 , which is a circuit using thyristor rectification and voltage regulation in the prior art, and it utilizes the principle of phase-shifting voltage regulation. But these rectifier circuits usually have the following main disadvantages: 1. There are many harmonic components and large harmonic current, which will pollute the ...

AI Technical Summary

Problems solved by technology

However, these rectifier circuits usually have the following main disadvantages: 1. There are many harmonic components and large harmonic current, which will pollute the power grid and the power factor is low; 2. Only step-down output can be realized, and the output cannot be guaranteed when the input voltage is low. Voltage stability, narrow application range

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