CN201594793U - Anti-interference power supply - Google Patents
Anti-interference power supply Download PDFInfo
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- CN201594793U CN201594793U CN2009203178369U CN200920317836U CN201594793U CN 201594793 U CN201594793 U CN 201594793U CN 2009203178369 U CN2009203178369 U CN 2009203178369U CN 200920317836 U CN200920317836 U CN 200920317836U CN 201594793 U CN201594793 U CN 201594793U
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- filter
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Abstract
The utility model relates to the technical field of electromagnetic compatibility (EMC), in particular to a power supply filter circuit system. The power supply circuit meets requirements of the electromagnetic compatibility technology and aims to overcome shortages of high cost, large volume and heavy weight of power supply circuits caused by the existing EMC technology. The technical scheme of the utility model includes that the anti-interference power supply comprises an EMI filter and a rectifier, and is characterized in that an input end of the rectifier is connected with alternating current, an output end of the rectifier is connected with the EMI filter, and an output end of the EMI filter is connected with a direct current output end. In the technical scheme, the EMI at the alternating current inlet end in the prior art is changed to be connected to the rear of the rectifier, and by aid of isolating action of the rectifier and filter function of the EMI filter, anti-interference capacity of the power supply is increased, circuit design is simplified, and volume, weight and cost of the power supply are reduced. Therefore, the anti-interference power supply is adaptable to consumer electronic products such as household electric appliances.
Description
Technical field
The utility model relates to electromagnetic compatibility (EMC) technology, particularly a kind of electric source filter circuit system.
Background technology
Power supply is the important and necessary part of electric equipment, according to its mode of operation, generally is divided into two kinds of linear power supply and Switching Power Supplies.The technology that linear power supply adopts is directly specified ac voltage to be arrived in input voltage adjustment (generally adopting transformer, capacitor etc.), through the rectifying and wave-filtering output DC; The technology that Switching Power Supply adopts is first with output DC after the AC rectification filtering of electrical network input, obtains the direct voltage of needs again by PWM (pulse width modulation) technology.In order to reach the EMC requirement, the ac input end of power circuit generally need be taked some Anti-Jamming Techniques, and common way is to insert EMI (electromagnetic interference) filter.
Switching Power Supply has the advantage that volume is little, efficient is high, be convenient to adjust control, increasing electric equipment, and particularly current popular various consumer electronics products have extensively adopted switching power circuit.Along with the development of power technology, particularly Switching Power Supply develop to miniaturization, big capacity direction, the operating frequency of Switching Power Supply (switching frequency) is more and more higher, and switching power circuit has become very important to the electromagnetic interference of electrical network.The EMC technology that the Switching Power Supply of prior art adopts generally also is to increase electromagnetic interface filter at the alternating current input, to reach the EMC designing requirement.Its circuit structure as shown in Figure 1.The input capacitance C01 and the output capacitance C02 that grip inductance L 01 (two groups of coils that are wound on the same magnetic core constitute) and two ends parallel connection thereof altogether among Fig. 1 constitute ∏ type filter circuit, and this structure is a kind of typical electromagnetic interface filter commonly used.The interference signal of filter out power introducing is to the influence of complete machine on the one hand; The interference (mainly being the harmonic component of switching frequency and the various interference signals that complete machine produces by the power supply coupling) that on the one hand can isolating switch power electrical network be produced.At first by the EMI circuit, input rectifier D01 carries out rectification to alternating current among Fig. 1 (AC220V) then, and again by filter capacitor C03 filtering alternating-current pulse, output DC is exported satisfactory direct voltage through the PWM controller from dc output end at last.Because the EMI circuit adopts electric capacity and inductance to carry out passive filtering, require to grip inductance L 01 altogether and have bigger inductance value, this just needs to adopt the bigger magnetic core of volume and increases coil turn, and input capacitance C01 and output capacitance C02 need adopt high voltage bearing ac filter electric capacity, these all will cause, and the EMI circuit cost increases, volume weight increases, make the Switching Power Supply comparison heaviness that seems, price is higher simultaneously.
The utility model content
Technical problem to be solved in the utility model, the power circuit cost height that causes at existing EMC technology, the shortcoming that volume is big, weight is big exactly, a kind of power circuit that meets the electromagnetic compatibility technology requirement is provided, and reduces circuit cost, reduce volume and weight.
The utility model solve the technical problem, the technical scheme that adopts is, a kind of anti-jamming power-supply, comprise electromagnetic interface filter, rectifier, it is characterized in that: described rectifier input is connected with alternating current, described rectifier output end is connected with electromagnetic interface filter, electromagnetic interface filter output termination dc output end;
Preferably: described rectifier is a full wave bridge rectifier;
Concrete: described electromagnetic interface filter by a pair of grip inductance altogether and be connected in parallel on the input and output capacitors of gripping the inductance two ends altogether constitute, described input capacitance connects rectifier output end; Output capacitance one termination dc output end, other end ground connection;
More specifically: described input capacitance and/or output capacitance are electrochemical capacitor;
Further: described output capacitance capacity is greater than the input capacitance capacity;
Concrete: described input capacitance capacity is a μ F level;
Recommend: described output capacitance capacity is greater than the input capacitance capacity more than 10 times;
Concrete: described output capacitance capacity is 1 μ F, and described input capacitance capacity is 22 μ F;
Further: described power supply is a Switching Power Supply, and described output capacitance one end is connected other end ground connection by the PWM controller with dc output end.
The beneficial effects of the utility model are that circuit is simple, cost is low, reliability is high, goes for multiple power supply.The ac capacitor that can save electromagnetic interface filter; Can suitably reduce and grip complete class requirement of inductance and inductance value altogether, reach the purpose that reduces cost, reduces the Switching Power Supply volume and improve reliability.
Below in conjunction with drawings and Examples, describe the technical solution of the utility model in detail.
Description of drawings
Fig. 1 is the circuit theory schematic diagram of prior art Switching Power Supply;
Fig. 2 is the circuit theory schematic diagram of embodiment 1;
Fig. 3 is the circuit theory schematic diagram of embodiment 2.
Embodiment
The technical solution of the utility model is exchanging the electromagnetic interface filter reconfiguration of end of incoming cables in the prior art power supply after rectifier.Circuit after the improvement is owing to be the filtering of ∏ type, and filter capacitor originally can suitably reduce capacity, and the reduction of gripping the inductance value of inductance altogether can reduce volume, and has saved ac filter electric capacity.
Embodiment 1
This routine anti-jamming power-supply comprises electromagnetic interface filter, rectifier D1 and PWM controller, as shown in Figure 2.Wherein rectifier D1 adopts full wave bridge rectifier, electromagnetic interface filter by a pair of grip inductance L 1 altogether and be connected in parallel on the input capacitance C1 and the output capacitance C2 that grip inductance L 1 two ends altogether constitute.This type of attachment also can be regarded inductance L 1, input capacitance C1 and output capacitance C2 as the ∏ mode filter.In the general circuit design, the capacity of output capacitance C2 answers＞10 with the ratio of the capacity of input capacitance C1, and the capacity of input capacitance C1 is generally the requirement that μ F level (1～10 μ F) just can satisfy most of power circuits.Output capacitance C2 selects bigger capacity for use, helps reducing the standing-wave ratio of output dc voltage, guarantees filter effect.Even input capacitance C1 adopts the electric capacity than low capacity, can not produce too much influence yet, and can reduce cost filter effect, reduce the electric capacity volume, reduce its inductance respectively, help the filtering High-frequency Interference.In this example, input capacitance C1 selects the electrochemical capacitor of 1 μ F for use, and output capacitance C2 selects the electrochemical capacitor of 22 μ F for use, is enough to satisfy the requirement of general electronic products to power supply.Among Fig. 2, rectifier D1 input directly is connected with the 220V alternating current, and input capacitance C1 positive pole connects rectifier D1 output, and negative pole is by gripping a coil ground connection of inductance L 1 altogether.Output capacitance C2 positive pole connects the input of PWM controller, minus earth.The output of PWM controller is this routine power supply dc output end.
Embodiment 2
Referring to Fig. 3, this is a linear power supply.The input AC electricity is depressured to rated value by transformer, is rectified into direct current through rectifier D1 again, exports by electromagnetic interface filter then.The structure of this routine electromagnetic interface filter and with the annexation of circuit, can repeat no more referring to the description of embodiment 1 herein.
The technical solution of the utility model, to exchange the electromagnetic interface filter reconfiguration of end of incoming cables in the prior art power supply after rectifier, utilize of the filter action of the buffer action of rectifier in conjunction with electromagnetic interface filter, improved the antijamming capability of power supply, and simplified circuit design, reduce power volume and weight, reduced the power supply cost, be fit to very much consumer electronics product uses such as household electrical appliance.
Claims (10)
1. an anti-jamming power-supply comprises electromagnetic interface filter, rectifier, it is characterized in that: described rectifier input is connected with alternating current, and described rectifier output end is connected with electromagnetic interface filter, electromagnetic interface filter output termination dc output end.
2. a kind of anti-jamming power-supply according to claim 1 is characterized in that: described rectifier is a full wave bridge rectifier.
3. a kind of anti-jamming power-supply according to claim 1 and 2, it is characterized in that: described electromagnetic interface filter by a pair of grip inductance altogether and be connected in parallel on the input and output capacitors of gripping the inductance two ends altogether constitute, described input capacitance connects rectifier output end, output capacitance one termination dc output end other end ground connection.
4. a kind of anti-jamming power-supply according to claim 3 is characterized in that: described input capacitance and/or output capacitance are electrochemical capacitor.
5. a kind of anti-jamming power-supply according to claim 4 is characterized in that: described output capacitance capacity is greater than the input capacitance capacity.
6. a kind of anti-jamming power-supply according to claim 5 is characterized in that: described input capacitance capacity is a μ F level.
7. a kind of anti-jamming power-supply according to claim 6 is characterized in that: described output capacitance capacity is greater than the input capacitance capacity more than 10 times.
8. a kind of anti-jamming power-supply according to claim 6 is characterized in that: described output capacitance capacity is 1 μ F, and described input capacitance capacity is 22 μ F.
9. a kind of anti-jamming power-supply according to claim 3 is characterized in that: described power supply is a Switching Power Supply, and described output capacitance one end is connected other end ground connection by the PWM controller with dc output end.
10. a kind of anti-jamming power-supply according to claim 1 and 2 is characterized in that: described power supply is a Switching Power Supply, and the electromagnetic interface filter output connects dc output end by the PWM controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203178369U CN201594793U (en) | 2009-12-18 | 2009-12-18 | Anti-interference power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203178369U CN201594793U (en) | 2009-12-18 | 2009-12-18 | Anti-interference power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201594793U true CN201594793U (en) | 2010-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009203178369U Expired - Fee Related CN201594793U (en) | 2009-12-18 | 2009-12-18 | Anti-interference power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201594793U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012125520A1 (en) * | 2011-03-14 | 2012-09-20 | Electrolux Home Products, Inc. | Electric heating appliance with ac-line filter with low leakage current |
-
2009
- 2009-12-18 CN CN2009203178369U patent/CN201594793U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012125520A1 (en) * | 2011-03-14 | 2012-09-20 | Electrolux Home Products, Inc. | Electric heating appliance with ac-line filter with low leakage current |
| CN103828483A (en) * | 2011-03-14 | 2014-05-28 | 伊莱克斯家用产品公司 | Electric heating appliance with AC-line filter with low leakage current |
| CN103828483B (en) * | 2011-03-14 | 2016-11-09 | 伊莱克斯家用产品公司 | There is the low electric heater of the leakage current of AC line filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Sichuan Changhong Device Technology Co., Ltd. Assignor: Sichuan Changhong Electrical Appliance Co., Ltd. Contract record no.: 2011510000191 Denomination of utility model: Anti-interference power supply Granted publication date: 20100929 License type: Exclusive License Record date: 20110822 |
|
| 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: 20100929 Termination date: 20161218 |