CN208522661U

CN208522661U - A kind of current rectifying and wave filtering circuit

Info

Publication number: CN208522661U
Application number: CN201820931371.5U
Authority: CN
Inventors: 徐杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-06-14
Filing date: 2018-06-14
Publication date: 2019-02-19
Anticipated expiration: 2028-06-14

Abstract

The utility model discloses a kind of current rectifying and wave filtering circuits, including fuse F1, resistance R1~R3, capacitor C1~C5, common mode inductance L1, rectifier bridge D1.The circuit structure of the current rectifying and wave filtering circuit of the utility model is simple, while can reduce the loss of power supply, to improve the power conversion efficiency of power supply entirety.

Description

A kind of current rectifying and wave filtering circuit

Technical field

The utility model belongs to power technique fields, particularly a kind of current rectifying and wave filtering circuit.

Background technique

In Switching Power Supply design, current rectifying and wave filtering circuit carries out rectifying and wave-filtering to the electric main of input, as switch electricity The first part in source, the superiority and inferiority of circuit design directly affect the output operating condition and performance indexes of power supply.Switching Power Supply It is primarily present Conduction Interference and near-field thermal radiation interferes, and the di/ that these interference sources are mainly generated by power switch tube switch motion Dt and du/dt cause, simultaneously because in rectification circuit input current be it is interrupted, not only cause the drop significantly of input power factor It is low, but also increase a large amount of higher hamonic wave, the part so electromagnetic interface filter is very important in Switching Power Supply.EMI filtering Device has and has apparent inhibiting effect to differential mode and common mode noise signal, so differential mode filter and common mode filtering can generally be added Device.As how a kind of simple circuit structure realizes that above-mentioned function becomes the important topic of this field.

Therefore, for drawbacks described above present in currently available technology, it is really necessary to be studied, to provide a kind of side Case solves defect existing in the prior art.

Utility model content

The utility model provides a kind of simple current rectifying and wave filtering circuit of circuit structure in view of the deficiencies in the prior art, uses Preferably to meet the application requirement of Switching Power Supply.

To achieve the above object, the technical solution of the utility model is as follows:

A kind of current rectifying and wave filtering circuit, including fuse F1, resistance R1~R3, capacitor C1~C5, common mode inductance L1, rectifier bridge D1；One end of fuse F1 is connect with input alternating current one end, the other end of fuse and one end, the first capacitor of first resistor R1 The 1st pin connection of one end of C1, one end of second resistance R2, common mode inductance L1, the other end and alternating current of first resistor R1 are defeated The 3rd pin connection of the other end, the electric other end of a capacitor C1, the other end of second resistance R2, common mode inductance L1 that enter, common mode The 2nd pin of inductance L1 is connect with one end of the second capacitor C2, one end of the 4th capacitor C4, the 2nd pin of rectifier bridge D1, and second The of one end connect and ground of the other end of capacitor C2 and third capacitor C3, the other end of third capacitor C3 and common mode inductance L1 The 4th pin connection of 4 pins, the other end of the 4th capacitor C4, rectifier bridge D1, the 3rd pin and 3rd resistor R3 of rectifier bridge D1 One end, the 5th capacitor C5 anode connection, the other end of the 1st pin of rectifier bridge D1 and 3rd resistor R3, the 5th capacitor C5 Cathode connect and ground end；It is 20D471K that the first resistor R1, which is varistor type selecting, and first capacitor C1 is X capacitor, second Capacitor C2 and third capacitor C3 is Y capacitance, and the 5th capacitor C5 is electrolytic capacitor.

Resistance R1 is the varistor of model 20D-471K as a preferred technical solution,.

The common mode inductance L1 is isolating transformer as a preferred technical solution,.

Capacitor C4 and capacitor C1 is safety X-type capacitor as a preferred technical solution,.

Capacitor C2 and capacitor C3 is safety Y type capacitor as a preferred technical solution,.

The utility model has the advantages that

The circuit structure of the current rectifying and wave filtering circuit of the utility model is simple, while can reduce the loss of power supply, to mention The high power conversion efficiency of power supply entirety.

Detailed description of the invention

Fig. 1 is the circuit diagram of the utility model current rectifying and wave filtering circuit；

Following specific embodiment will further illustrate the utility model in conjunction with above-mentioned attached drawing.

Specific embodiment

Technical solution provided by the utility model is described further below with reference to attached drawing.

Referring to Fig. 1, it show the circuit diagram of current rectifying and wave filtering circuit, including fuse F1, resistance R1~R3, capacitor C1 ~C5, common mode inductance L1, rectifier bridge D1；One end of fuse F1 is connect with input alternating current one end, the other end of fuse and the The 1st pin connection of one end, one end of first capacitor C1, one end of second resistance R2, common mode inductance L1 of one resistance R1, first The other end, the electric other end of a capacitor C1, the other end of second resistance R2, the common mode electricity of the other end and the alternating current input of resistance R1 Feel the 3rd pin connection of L1, the 2nd pin of common mode inductance L1 and one end of the second capacitor C2, one end of the 4th capacitor C4, rectification The 2nd pin of bridge D1 connects, the other end of the second capacitor C2 and one end connect and ground of third capacitor C3, third capacitor C3's The other end is connect with the 4th pin of the 4th pin of common mode inductance L1, the other end of the 4th capacitor C4, rectifier bridge D1, rectifier bridge D1 The 3rd pin and one end of 3rd resistor R3, the 5th capacitor C5 anode connect, the 1st pin and 3rd resistor R3 of rectifier bridge D1 The other end, the 5th capacitor C5 cathode connect and ground end；It is 20D471K that the first resistor R1, which is varistor type selecting, First capacitor C1 is X capacitor, and the second capacitor C2 and third capacitor C3 are Y capacitance, and the 5th capacitor C5 is electrolytic capacitor.

The circuit design of Fig. 1 is mainly the improve and perfect to module rectification principle, and improved module is had Effect completes rectified action and EMI filtering, provides stable voltage support for the power dress mold changing block and accessory power supply of rear class.It is whole Flowing in filter circuit includes the devices such as varistor, rectifier bridge, filter capacitor and electromagnetic interface filter, wherein R1 is model The varistor of 20D-471K.Varistor is that a kind of C-V characteristic is nonlinear resistance, when the similar burst such as lightning stroke occurs When situation, filter module utilizes its nonlinear characteristic by unexpected raised voltage clamping to a relatively-stationary value, thus It plays a protective role to the module of rear class.Common mode inductance L1 is that isolating transformer can be effectively isolated input and successive load Interference.C4, C1 are safety X-type capacitor, and C2, C3 are safety Y type capacitor.Safety X capacitance connection, can be at the both ends of input circuit The effectively DM EMI in filtered input signal, and safety Y capacitance is then connected between phase line and ground wire, to the common mode of circuit Inhibiting effect is played in interference, and safety resistor can greatly improve the EMI ability of current rectifying and wave filtering circuit.EMI module rear is connected to Rectifier bridge and electrolytic capacitor make exchange input electricity be converted to steady dc voltage by the rectifying and wave-filtering processing of full-bridge rectification.

The method and its core concept of the above embodiments are only used to help understand the utility model.It should refer to It out, for those skilled in the art, without departing from the principle of this utility model, can also be to this Some improvement and modification can also be carried out for utility model, these improvement and modification also fall into the protection scope of the utility model claims It is interior.

The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein The widest scope consistent with features of novelty.

Claims

1. a kind of current rectifying and wave filtering circuit, which is characterized in that including fuse F1, resistance R1~R3, capacitor C1~C5, common mode inductance L1, rectifier bridge D1；One end of fuse F1 is connect with input alternating current one end, the other end of fuse and the one of first resistor R1 The 1st pin connection at end, one end of first capacitor C1, one end of second resistance R2, common mode inductance L1, first resistor R1's is another The other end inputted with alternating current, the electricity other end of one capacitor C1, the other end of second resistance R2, common mode inductance L1 is held the 3rd to draw Foot connection, the 2nd pin of common mode inductance L1 draw with one end, one end of the 4th capacitor C4, the 2nd of rectifier bridge D1 of the second capacitor C2 Foot connection, the other end of the second capacitor C2 and one end connect and ground of third capacitor C3, the other end of third capacitor C3 is together The 4th pin connection of the 4th pin, the other end of the 4th capacitor C4, rectifier bridge D1 of mould inductance L1, the 3rd pin of rectifier bridge D1 Connect with the anode of one end of 3rd resistor R3, the 5th capacitor C5, the other end of the 1st pin of rectifier bridge D1 and 3rd resistor R3, The cathode connect and ground end of 5th capacitor C5；The first resistor R1 is that varistor type selecting is 20D471K, first capacitor C1 For X capacitor, the second capacitor C2 and third capacitor C3 are Y capacitance, and the 5th capacitor C5 is electrolytic capacitor.

2. current rectifying and wave filtering circuit according to claim 1, which is characterized in that resistance R1 is the pressure-sensitive of model 20D-471K Resistance.

3. current rectifying and wave filtering circuit according to claim 1 or 2, which is characterized in that the common mode inductance L1 is isolation transformation Device.

4. current rectifying and wave filtering circuit according to claim 1 or 2, which is characterized in that capacitor C4 and capacitor C1 is safety X-type electricity Hold.

5. current rectifying and wave filtering circuit according to claim 1 or 2, which is characterized in that capacitor C2 and capacitor C3 is safety Y type electricity Hold.