CN203387401U - Switching power supply - Google Patents
Switching power supply Download PDFInfo
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- CN203387401U CN203387401U CN201320458087.8U CN201320458087U CN203387401U CN 203387401 U CN203387401 U CN 203387401U CN 201320458087 U CN201320458087 U CN 201320458087U CN 203387401 U CN203387401 U CN 203387401U
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- switching power
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Abstract
The utility model provides a switching power supply, which belongs to the technical field of power electronics, and solves a problem that a switching power supply in the prior art has defects in anti-electromagnetic interference. The switching power supply comprises a rectifying circuit and a filtering circuit, wherein the input end of the rectifying circuit is the input end of the switching power supply, the output end of the rectifying circuit is connected with the input end of the filtering circuit, the output end of the filtering circuit is the output end of the switching power supply, the filtering circuit comprises an inductor L1, an inductor L2, a capacitor C1 and a capacitor C2, the filtering circuit comprises two output ends which are connected with one ends of the inductor L1 and the inductor L2 respectively, a resistor R1 is connected to two ends of the inductor L1 in parallel, a resistor R2 is connected to two ends of the inductor L2 in parallel, the capacitor C1 is connected to the two output ends of the rectifying circuit in parallel, one end of the capacitor C2 is connected with the other end of the inductor L1, and the other end of the capacitor C2 is connected with the other end of the inductor L2. The switching power supply provided by the utility model has better capacity in resisting electromagnetic interferences, and is more stable in performance.
Description
Technical field
The utility model belongs to electric and electronic technical field, relates to a kind of Switching Power Supply.
Background technology
Switching Power Supply is to utilize modern power electronics technology, and the time ratio that the control switch pipe turns on and off maintains a kind of power supply of regulated output voltage, along with development and the innovation of power electronic technology, makes switch power technology also in constantly innovation.At present, Switching Power Supply, with small-sized, light weight and high efficiency characteristics nearly all electronic equipment that is widely used, is the indispensable a kind of power mode of current electronics and information industry develop rapidly.Switching Power Supply is compared with linear power supply, and the cost of the two all increases along with the increase of power output, but the two rate of rise is different.The linear power supply cost is on a certain power output point, on the contrary higher than Switching Power Supply.Along with development and the innovation of power electronic technology, make switch power technology in constantly innovation, this cost rollback point moves to low output power end day by day, and this provides development space widely for Switching Power Supply.The Switching Power Supply high frequency is the direction of its development, and high frequency makes the Switching Power Supply miniaturization, and makes Switching Power Supply enter application widely, particularly in the application of high-technology field, has promoted miniaturization, the lighting of new high-tech product.In addition the development of Switching Power Supply be applied in safety monitoring, energy savings, economize on resources and the protection of the environment aspect all has great importance.
The Switching Power Supply product is widely used in that industrial automatic control, military industry equipment, research equipment, LED illumination, industrial control equipment, communication apparatus, power equipment, instrument and meter, Medical Devices, semiconductor refrigerating heat, air purifier, electronic refrigerator, liquid crystal display, the LED light fixture, communication apparatus, audio-visual products, safety monitoring, LED lamp bag, computer housing, the fields such as digital product and instrument class.Electromagnetic interference (Electromagnetic Interference is called for short EMI), refer to the interference phenomenon produced after electromagnetic wave and electronic component effect, and two kinds of conducted interference and radiated interference are arranged.Conducted interference refers to by conducting medium the signal coupling (interference) on an electric network is arrived to another electric network.Radiated interference refers to that interference source arrives another electric network to its signal coupling (interference) by space, in High-Speed PCB and system, the pin of high-frequency signal line, integrated circuit, all kinds of connectors etc. all may become the radiated interference source with antenna performance, and the energy emitting electromagnetic wave also affects other system or the normal operation of interior other subsystems of native system.Because the EMI index of Switching Power Supply can have influence on electrical network, therefore, before dispatching from the factory, Switching Power Supply all needs the EMI index is detected, how to design and manufacture anti-electromagnetic interference capability good, the Switching Power Supply of stable performance, become the target that manufacturers are pursued.
Summary of the invention
There are the problems referred to above in the utility model for existing technology, has proposed a kind of Switching Power Supply, and this Switching Power Supply has better anti-electromagnetic interference capability, and performance is more stable.
The utility model is realized by following technical proposal: a kind of Switching Power Supply, comprise for the ac signal by input and carry out the rectification circuit of rectification processing output DC signal and carry out filtering for the DC signal by rectification circuit output and process the filter circuit that improves anti-electromagnetic interference capability, the input that the input of described rectification circuit is this Switching Power Supply, the output of described rectification circuit is connected with the input of filter circuit, the output that the output of described filter circuit is this Switching Power Supply, it is characterized in that, described filter circuit comprises inductance L 1, inductance L 2, capacitor C 1 and capacitor C 2, described rectification circuit comprises two outputs, two outputs are connected with an end of inductance L 1 and inductance L 2 respectively, the two ends of described inductance L 1 are parallel with resistance R 1, the two ends of described inductance L 2 are parallel with resistance R 2, described capacitor C 1 is connected in parallel on two outputs of rectification circuit, one end of described capacitor C 2 is connected with the other end of inductance L 1, the other end of described capacitor C 2 is connected with the other end of inductance L 2.
Rectification circuit becomes direct current by civil power 220V AC rectification, on inductance L 1 on parallel resistance R1 and inductance L 2 after parallel resistance R2, carry out double-smoothing by capacitor C 1 and capacitor C 2, effectively improved the anti-electromagnetic interference capability of this Switching Power Supply, make the performance of this Switching Power Supply more stable.
In above-mentioned Switching Power Supply, described rectification circuit comprises cathode output end one and cathode output end one, described cathode output end one is connected with inductance L 1 one ends, the cathode output end two that the other end of described inductance L 1 is filter circuit, described cathode output end one is connected with inductance L 2 one ends, the cathode output end two that the other end of described inductance L 2 is filter circuit, the positive pole of described capacitor C 1 is connected on the connected node that cathode output end one is connected with inductance L 1, the negative pole of described capacitor C 1 is connected on the connected node that cathode output end one is connected with inductance L 2, the positive pole of described capacitor C 2 is connected with the other end of inductance L 1, the negative pole of described capacitor C 2 is connected with the other end of inductance L 2.
In above-mentioned Switching Power Supply, described rectification circuit is full-wave rectifying circuit or half-wave rectifying circuit.Full-wave rectifying circuit and half-wave rectifying circuit all can be carried out rectification by the ac signal of input civil power, are rectified into DC signal output.
In above-mentioned Switching Power Supply, described capacitor C 1 and capacitor C 2 are electrochemical capacitor.Electrochemical capacitor has advantages of that capacitance is large.
In above-mentioned Switching Power Supply, the capacity of described capacitor C 1 is greater than capacitor C 2.Carry out double-smoothing, improve the stability of out-put supply signal.
In above-mentioned Switching Power Supply, the electrode input end of described rectification circuit is connected with fuse F1.Burn out components and parts while avoiding current overload.
Compared with prior art, this Switching Power Supply is passed through parallel resistance R1 and resistance R 2 on inductance L 1 and inductance L 2, and carries out filtering by capacitor C 1 and capacitor C 2, effectively improves the anti-electromagnetic interference capability of Switching Power Supply.
The accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
In figure, 1, rectification circuit; 2, filter circuit.
Embodiment
Be below specific embodiment of the utility model by reference to the accompanying drawings, the technical solution of the utility model is further described, but the utility model be not limited to these embodiment.
As shown in Figure 1, a kind of Switching Power Supply, comprise for the ac signal by input and carry out the rectification circuit 1 of rectification processing output DC signal and carry out filtering for the DC signal by rectification circuit 1 output and process the filter circuit 2 that improves anti-electromagnetic interference capability, the input that the input of rectification circuit 1 is this Switching Power Supply, the output of rectification circuit 1 is connected with the input of filter circuit 2, the output that the output of filter circuit 2 is this Switching Power Supply.
Filter circuit 2 comprises inductance L 1, inductance L 2, capacitor C 1 and capacitor C 2, rectification circuit 1 comprises two outputs, two outputs are connected with an end of inductance L 1 and inductance L 2 respectively, the two ends of inductance L 1 are parallel with resistance R 1, the two ends of inductance L 2 are parallel with resistance R 2, described capacitor C 1 is connected in parallel on two outputs of rectification circuit 1, and an end of described capacitor C 2 is connected with the other end of inductance L 1, and the other end of described capacitor C 2 is connected with the other end of inductance L 2.
Rectification circuit 1 is full-wave rectifying circuit or half-wave rectifying circuit, full-wave rectifying circuit and half-wave rectifying circuit all can be carried out rectification by the ac signal of input civil power, be rectified into DC signal output, rectification circuit 1 comprises in cathode output end one figure for being that B holds in A end and cathode output end one figure, the electrode input end that burns out components and parts rectification circuit 1 when avoiding current overload is connected with fuse F1, cathode output end one is connected with inductance L 1 one ends, it in cathode output end two figure that the other end of inductance L 1 is filter circuit 2, is the C end, cathode output end one is connected with inductance L 2 one ends, it in cathode output end two figure that the other end of inductance L 2 is filter circuit 2, is the D end, the positive pole of capacitor C 1 is connected on the connected node that cathode output end one is connected with inductance L 1, the negative pole of capacitor C 1 is connected on the connected node that cathode output end one is connected with inductance L 2, the positive pole of capacitor C 2 is connected with the other end of inductance L 1, the negative pole of capacitor C 2 is connected with the other end of inductance L 2.Capacitor C 1 and capacitor C 2 are electrochemical capacitor, and electrochemical capacitor has good filter action, and the capacity of capacitor C 1 is greater than capacitor C 2, carries out double-smoothing, improve the stability of out-put supply signal.
The operation principle of this Switching Power Supply is as follows: this Switching Power Supply is applicable to the LED illuminating industry, do not reach international EMI standard because the Switching Power Supply anti-electromagnetic interference capability is not up to standard, can cause to pass to electrical network and disturb and radiated interference, easily have influence on the stability of mains supply, therefore, the Switching Power Supply that does not reach international EMI standard is not allow to sell and use.This Switching Power Supply has greatly improved anti-electromagnetic interference capability after improvement, Switching Power Supply is accessed to civil power, rectification circuit 1 becomes direct current by the 220V AC rectification, and the direct current after processing by cathode output end mouth one and the two output rectifications of cathode output end mouth, parallel resistance R1 on inductance L 1, parallel resistance R2 on inductance L 2, coordinate the direct current after 2 pairs of rectifications of capacitor C 1 and capacitor C are processed to carry out the filtering processing, make the DC signal of cathode output end mouth two and two outputs of cathode output end mouth more stable, there is anti-electromagnetic interference capability preferably, effectively improve the Switching Power Supply performance, resistance R 1 and resistance R 2 also can be parallel with one another by other resistance, series connection or series-parallel connection reach the resistance of resistance R 1 and resistance R 2, can reach anti-electromagnetic interference capability preferably.
Claims (6)
1. a Switching Power Supply, comprise for the ac signal by input and carry out the rectification circuit (1) of rectification processing output DC signal and carry out filtering for the DC signal by rectification circuit (1) output and process the filter circuit (2) that improves anti-electromagnetic interference capability, the input that the input of described rectification circuit (1) is this Switching Power Supply, the output of described rectification circuit (1) is connected with the input of filter circuit (2), the output that the output of described filter circuit (2) is this Switching Power Supply, it is characterized in that, described filter circuit (2) comprises inductance L 1, inductance L 2, capacitor C 1 and capacitor C 2, described rectification circuit (1) comprises two outputs, two outputs are connected with an end of inductance L 1 and inductance L 2 respectively, the two ends of described inductance L 1 are parallel with resistance R 1, the two ends of described inductance L 2 are parallel with resistance R 2, described capacitor C 1 is connected in parallel on two outputs of rectification circuit (1), one end of described capacitor C 2 is connected with the other end of inductance L 1, the other end of described capacitor C 2 is connected with the other end of inductance L 2.
2. Switching Power Supply according to claim 1, it is characterized in that, described rectification circuit (1) comprises cathode output end one and cathode output end one, described cathode output end one is connected with inductance L 1 one ends, the cathode output end two that the other end of described inductance L 1 is filter circuit (2), described cathode output end one is connected with inductance L 2 one ends, the cathode output end two that the other end of described inductance L 2 is filter circuit (2), the positive pole of described capacitor C 1 is connected on the connected node that cathode output end one is connected with inductance L 1, the negative pole of described capacitor C 1 is connected on the connected node that cathode output end one is connected with inductance L 2, the positive pole of described capacitor C 2 is connected with the other end of inductance L 1, the negative pole of described capacitor C 2 is connected with the other end of inductance L 2.
3. Switching Power Supply according to claim 1 and 2, is characterized in that, described rectification circuit (1) is full-wave rectifying circuit or half-wave rectifying circuit.
4. Switching Power Supply according to claim 3, is characterized in that, described capacitor C 1 and capacitor C 2 are electrochemical capacitor.
5. Switching Power Supply according to claim 4, is characterized in that, the capacity of described capacitor C 1 is greater than capacitor C 2.
6. Switching Power Supply according to claim 3, is characterized in that, the electrode input end of described rectification circuit (1) is connected with fuse F1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320458087.8U CN203387401U (en) | 2013-07-29 | 2013-07-29 | Switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320458087.8U CN203387401U (en) | 2013-07-29 | 2013-07-29 | Switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203387401U true CN203387401U (en) | 2014-01-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320458087.8U Expired - Lifetime CN203387401U (en) | 2013-07-29 | 2013-07-29 | Switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203387401U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108185846A (en) * | 2017-12-29 | 2018-06-22 | 九阳股份有限公司 | A kind of soy bean milk making machine |
| CN109460090A (en) * | 2017-09-06 | 2019-03-12 | 深圳市海洋王照明工程有限公司 | A kind of temperature-humidity detecting device and its control circuit |
| WO2020113967A1 (en) * | 2018-12-03 | 2020-06-11 | 敏业信息科技（上海）有限公司 | Power filter circuit |
-
2013
- 2013-07-29 CN CN201320458087.8U patent/CN203387401U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109460090A (en) * | 2017-09-06 | 2019-03-12 | 深圳市海洋王照明工程有限公司 | A kind of temperature-humidity detecting device and its control circuit |
| CN108185846A (en) * | 2017-12-29 | 2018-06-22 | 九阳股份有限公司 | A kind of soy bean milk making machine |
| WO2020113967A1 (en) * | 2018-12-03 | 2020-06-11 | 敏业信息科技（上海）有限公司 | Power filter circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140108 |
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| CX01 | Expiry of patent term |