CN205883042U - A electromagnetic compatibility circuit for switching power supply - Google Patents
A electromagnetic compatibility circuit for switching power supply Download PDFInfo
- Publication number
- CN205883042U CN205883042U CN201620690795.8U CN201620690795U CN205883042U CN 205883042 U CN205883042 U CN 205883042U CN 201620690795 U CN201620690795 U CN 201620690795U CN 205883042 U CN205883042 U CN 205883042U
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- CN
- China
- Prior art keywords
- circuit
- common mode
- phase
- power supply
- switching power
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to an electromagnetic compatibility circuit field especially relates to an electromagnetic compatibility circuit for switching power supply, include the common mode filter circuit and the rectifier circuit that connect gradually from the input to the output, on the one hand, three -phase common mode inductance L1 constitutes common mode filter circuit with common mode electric capacity, and the common mode noise in the circuit has decayed to make switching power supply normally work, on the other hand has not only increased the first surge protection of preventing circuit at three -phase grid's output, has still increased the second at common mode filter circuit's output and has prevented the surge protection circuit, this ability that prevents transient state surge voltage that has improved whole circuit to avoid the impulse impact voltage in the electric wire netting to damage switching power supply.
Description
Technical field
This utility model relates to electromagnetic compatibility circuit field, particularly relates to a kind of electromagnetic compatibility electricity for Switching Power Supply
Road.
Background technology
Switching Power Supply is usually connected to the power converter between utility grid and communication or power equipment.Switch electricity
Having bi-directional electromagnetic interference effect between source device itself and utility grid and communication, power equipment, utility grid is then an exposure to
In the environment of the Nature, there is misoperation in this control circuit that may result in switch power supply equipment itself, thus affects switch
The normal work of power supply.Existing electromagnetic compatibility circuit can solve the problems referred to above, but, existing electromagnetic compatibility circuit is general
All only having power input to be provided with anti-surge protection circuit, this is not sufficient to the damage preventing surge to circuit.
Summary of the invention
The purpose of this utility model be to provide a kind of can not only compatible electromagnetism but also prevent the electricity for Switching Power Supply of surge
Magnetic compatible circuit.
The purpose of this utility model is achieved through the following technical solutions:
A kind of electromagnetic compatibility circuit for Switching Power Supply, including the common mode filtering being sequentially connected with from input to outfan
Circuit and rectification circuit, common mode filtering circuit includes each phase line output terminal of three-phase common mode inductance L1, three-phase common mode inductance L1
And it is connected between the N line output terminal of three-phase common mode inductance L1 and has common mode capacitance；Also include the first anti-surge circuit and the second wave resistance
Gushing circuit, the input of common mode filtering circuit connects three phase network, the outfan of common mode filtering circuit through the first anti-surge circuit
Connecting rectification circuit through the second anti-surge circuit, the first anti-surge circuit includes being connected between the outfan of three phase network and ground
The first filter capacitor, the second anti-surge circuit includes being connected between phase line output terminal and the ground of three-phase common mode inductance L1
Two filter capacitors.
Wherein, also include preventing voltage offset circuits, prevent voltage offset circuits from including being connected to three-phase common mode electricity
Resistance between each phase line output terminal and the N line output terminal of three-phase common mode inductance L1 of sense L1.
Wherein, the differential mode inductance L2 connecting rectification circuit output end is also included.
The beneficial effects of the utility model are: a kind of electromagnetic compatibility circuit for Switching Power Supply, including from input to
Common mode filtering circuit that outfan is sequentially connected with and rectification circuit, on the one hand, three-phase common mode inductance L1 is constituted altogether with common mode capacitance
Mould filter circuit, decayed the common-mode noise in circuit, so that Switching Power Supply can normally work；On the other hand, not only exist
The outfan of three phase network add the first anti-surge protection circuit, the also outfan at common mode filtering circuit add second prevent
Surge protection circuit, this improves the ability preventing transient surge voltage of whole circuit, thus is avoided the pulse in electrical network to rush
Hit voltage and damage Switching Power Supply.
Accompanying drawing explanation
The utility model is described in further detail to utilize accompanying drawing, but the embodiment in accompanying drawing is not constituted of the present utility model
Any restriction, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to following attached
Figure obtains other accompanying drawing.
Fig. 1 is the circuit theory diagrams in this utility model embodiment.
Detailed description of the invention
With the following Examples this utility model is further described.
A kind of electromagnetic compatibility circuit for Switching Power Supply of Fig. 1.Three-phase input end U, V, W and N line of three phase network is defeated
Entering the input that end connects three-phase common mode inductance L1 respectively, common mode capacitance C5, C6 and C7 are connected to three-phase common mode inductance L1
Each phase line output terminal and the N line output terminal of three-phase common mode inductance L1 between, three-phase common mode inductance L1 and common mode capacitance C5 ~
C7 forms common mode filtering circuit together.Three-phase common mode inductance L1 is a co-mode coil, uses the FERRITE CORE in closed magnetic circuit
The method of upper synchronous winding copper cash, benefit is that the magnetic flux preventing 50Hz alternating current from causing is saturated to be obtained greatly in the case of common mode
Inductance.So when mains input current flows through three-phase common mode inductance L1, produced magnetic field can cancel each other, be equivalent to
The inductance of one very big inductance quantity, thus for attenuation common-mode noise.
In order to provide transient surge voltage to protect, prevent the pulse shock voltage in electrical network (thunderbolt or other reasons cause)
Damaging Switching Power Supply, the present embodiment also includes the first anti-surge circuit and the second anti-surge circuit, the input of common mode filtering circuit
Holding and connect three phase network through the first anti-surge circuit, the outfan of common mode filtering circuit connects rectified current through the second anti-surge circuit
Road, the first anti-surge circuit includes the first filter capacitor being connected between the outfan of three phase network and ground, the second Anti-surging
Circuit includes the second filter capacitor being connected between phase line output terminal and the ground of three-phase common mode inductance L1.
In order to prevent voltage or load asymmetric in the case of produce zero-point voltage skew, the present embodiment also includes preventing electricity
Pressure off-centre circuit, it includes that each phase line output terminal being connected to three-phase common mode inductance L1 is defeated with the N line of three-phase common mode inductance L1
Go out the resistance between end.
Owing to, in low-frequency range, the large percentage of differential mode transmission noise, except eliminating common-mode noise, also at rectification circuit
Outfan add a differential mode inductance L2, for eliminate from differential mode transmission noise in opposite direction.
Last it should be noted that, above example is only in order to illustrate the technical solution of the utility model, rather than to this reality
With the restriction of novel protected scope, although having made to explain to this utility model with reference to preferred embodiment, this area general
Logical it will be appreciated by the skilled person that the technical solution of the utility model can be modified or equivalent, without deviating from this
The spirit and scope of utility model technical scheme.
Claims (3)
1. for an electromagnetic compatibility circuit for Switching Power Supply, including the common mode filtering electricity being sequentially connected with from input to outfan
Road and rectification circuit, it is characterised in that: common mode filtering circuit includes three-phase common mode inductance L1, each phase of three-phase common mode inductance L1
It is connected between line output terminal and the N line output terminal of three-phase common mode inductance L1 and has common mode capacitance；Also include the first anti-surge circuit and
Second anti-surge circuit, the input of common mode filtering circuit connects three phase network, common mode filtering circuit through the first anti-surge circuit
Outfan through second anti-surge circuit connect rectification circuit, the first anti-surge circuit includes the outfan being connected to three phase network
And the first filter capacitor between ground, the second anti-surge circuit includes the phase line output terminal being connected to three-phase common mode inductance L1 and ground
Between the second filter capacitor.
A kind of electromagnetic compatibility circuit for Switching Power Supply the most according to claim 1, it is characterised in that: also include preventing
Voltage offset circuits, prevents voltage offset circuits from including being connected to each phase line output terminal of three-phase common mode inductance L1 with three-phase altogether
Resistance between the N line output terminal of mould inductance L1.
A kind of electromagnetic compatibility circuit for Switching Power Supply the most according to claim 1, it is characterised in that: also include connecting
The differential mode inductance L2 of rectification circuit output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620690795.8U CN205883042U (en) | 2016-07-04 | 2016-07-04 | A electromagnetic compatibility circuit for switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620690795.8U CN205883042U (en) | 2016-07-04 | 2016-07-04 | A electromagnetic compatibility circuit for switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205883042U true CN205883042U (en) | 2017-01-11 |
Family
ID=57693752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620690795.8U Expired - Fee Related CN205883042U (en) | 2016-07-04 | 2016-07-04 | A electromagnetic compatibility circuit for switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205883042U (en) |
-
2016
- 2016-07-04 CN CN201620690795.8U patent/CN205883042U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170111 Termination date: 20170704 |