CN204131808U - Based on the constant current LED power supplies of CRC π type filtering - Google Patents
Based on the constant current LED power supplies of CRC π type filtering Download PDFInfo
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- CN204131808U CN204131808U CN201420661828.7U CN201420661828U CN204131808U CN 204131808 U CN204131808 U CN 204131808U CN 201420661828 U CN201420661828 U CN 201420661828U CN 204131808 U CN204131808 U CN 204131808U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses a kind of constant current LED power supplies based on the filtering of CRC π type, mains supply one end is connected with an input of rectifier bridge with the first resistance R1 by the first electric capacity C1 parallel with one another, the other end of mains supply is directly connected with another input of rectifier bridge, second resistance R2 is series at the cathode output end of rectifier bridge, second electric capacity C2 and the 3rd electric capacity C3 is parallel to the two ends of the second resistance R2 respectively, the second electric capacity C2 and the 3rd electric capacity C3 common ground; Pressure limiting diode D5, piezo-resistance RV and load LED lamp are parallel between two outputs of rectifier bridge successively.The utility model CRC π type filter circuit can effectively reduce AC ripple ripple coefficient, guarantees that the output of LED power is more smooth-going; Adopt diode voltage limiting mode to replace conventional serial resistance, reduce power supply caloric value and loss; When there is momentary surges voltage, the resistance value of piezo-resistance RV reduces rapidly, and instantaneous high pressure is absorbed by piezo-resistance RV, serves effective protective effect to LED load.
Description
Technical field
The utility model relates to a kind of constant current LED power supplies based on the filtering of CRC π type.
Background technology
Comparatively conventional incandescent and electricity-saving lamp have energy-conserving and environment-protective to LED, long service life, employing solid encapsulation be convenient to the advantages such as transport and installation, under the guide of the strategy of sustainable development, energy-saving and emission-reduction thought is constantly promoted, current country more and more payes attention to lighting energy saving and environmental issue, carrying out energetically using LED bulb, along with the development of LED technology, electricity-saving lamp and incandescent lamp will be replaced by LED in the near future.
LED power is used for providing driving DC voltage for LED, and its stability exported directly affects job stability and the useful life of LED.But there is following defect in traditional LED power:
1) inhibition of interchange clutter exported rectification circuit is poor, and the output of LED power is smooth-going not, LED load job insecurity and with damage;
2) adopt series resistance to carry out current limliting, the electric energy of resistance loss is comparatively large, causes larger energy loss, and cannot be applicable to high-powered LED lamp;
3) effectively cannot absorb surge voltage, the instantaneous voltage at LED load two ends increases severely, and is easily burned.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provide a kind of can effectively suppress to exchange clutter and momentary surges voltage, export the smooth-going constant current LED power supplies based on the filtering of CRC π type.
The purpose of this utility model is achieved through the following technical solutions: based on the constant current LED power supplies of CRC π type filtering, comprise reduction voltage circuit, rectification circuit, CRC π type filter circuit, pressure limiting circuit and anti-surge protection circuit, described reduction voltage circuit comprises the first electric capacity C1 parallel with one another and the first resistance R1; Rectification circuit is the rectifier bridge be made up of diode D1, D2, D3, D4; CRC π type filter circuit comprises the second resistance R, the second electric capacity C2 and the 3rd electric capacity C3; Pressure limiting circuit comprises pressure limiting diode D5; Anti-surge protection circuit comprises piezo-resistance RV;
One end of mains supply is connected with an input of rectifier bridge with the first resistance R1 by the first electric capacity C1 parallel with one another, the other end of mains supply is directly connected with another input of rectifier bridge, second resistance R2 is series at the cathode output end of rectifier bridge, second electric capacity C2 and the 3rd electric capacity C3 is parallel to the two ends of the second resistance R2 respectively, the second electric capacity C2 and the 3rd electric capacity C3 common ground; Pressure limiting diode D5, piezo-resistance RV and load LED lamp are parallel between two outputs of rectifier bridge successively.
Described load LED lamp is made up of multiple LED string, is in series with multiple LED lamp bead in each LED string, and each LED string is connected in parallel between two outputs of rectifier bridge respectively.
The beneficial effects of the utility model are:
1) the CRC π type filter circuit being series at cathode rectifier output effectively can reduce the output of AC ripple ripple coefficient, smooth direct current power supply signal, guarantees that the output of LED power is more smooth-going;
2) adopt diode voltage limiting mode to replace conventional serial resistance, reduce power supply caloric value and loss;
3) when there is momentary surges voltage, the resistance value of piezo-resistance RV reduces rapidly, and instantaneous high pressure is absorbed by piezo-resistance RV, serves effective protective effect to LED load.
Accompanying drawing explanation
Fig. 1 is the utility model circuit theory diagrams.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail, but protection range of the present utility model is not limited to the following stated.
As shown in Figure 1, based on the constant current LED power supplies of CRC π type filtering, comprise reduction voltage circuit, rectification circuit, CRC π type filter circuit, pressure limiting circuit and anti-surge protection circuit, described reduction voltage circuit comprises the first electric capacity C1 parallel with one another and the first resistance R1; Rectification circuit is the rectifier bridge be made up of diode D1, D2, D3, D4; CRC π type filter circuit comprises the second resistance R, the second electric capacity C2 and the 3rd electric capacity C3; Pressure limiting circuit comprises pressure limiting diode D5; Anti-surge protection circuit comprises piezo-resistance RV.
One end of mains supply is connected with an input of rectifier bridge with the first resistance R1 by the first electric capacity C1 parallel with one another, the other end of mains supply is directly connected with another input of rectifier bridge, second resistance R2 is series at the cathode output end of rectifier bridge, second electric capacity C2 and the 3rd electric capacity C3 is parallel to the two ends of the second resistance R2 respectively, the second electric capacity C2 and the 3rd electric capacity C3 common ground; Pressure limiting diode D5, piezo-resistance RV and load LED lamp are parallel between two outputs of rectifier bridge successively.
In the present embodiment, load LED lamp is made up of multiple LED string, is in series with multiple LED lamp bead in each LED string, and each LED string is connected in parallel between two outputs of rectifier bridge respectively.
Operation principle of the present utility model is as follows: 220V AC civil power completes step-down through C1 and R1 parallel with one another, and the rectifier bridge rectification that the alternating current after step-down input is made up of D1, D2, D3, D4 is direct current; DC power signal is by the CRC π type filter circuit of R2, C2, C3 composition, power supply signal is through the most AC portion of filtering filtering of C2, voltage after C2 is added in the RC filter circuit of R2 and C3 formation, C3 carries out filtering to alternating component further, and C2 capacitive reactance is very little, and High-frequency Interference composition easily switches to ground by small capacitances C2, fine to high-frequency ac interference filter effect, C3 capacity is large, and what flow through C3 is low-frequency ac composition, also fine to low-frequency ac interference filter effect; CRC π type filter circuit totally serves the effect reducing AC ripple ripple coefficient, smooth direct current output.Pressure limiting diode D5 carries out pressure limiting to through the filtered power supply signal of CRC π type filter circuit; When there is momentary surges voltage, the resistance value of piezo-resistance RV in parallel reduces rapidly, and instantaneous high pressure is absorbed by piezo-resistance RV, serves effective protective effect to LED load.
The above is only preferred implementation of the present utility model, be to be understood that the utility model is not limited to the form disclosed by this paper, should not regard the eliminating to other embodiments as, and can be used for other combinations various, amendment and environment, and can in contemplated scope described herein, changed by the technology of above-mentioned instruction or association area or knowledge.And the change that those skilled in the art carry out and change do not depart from spirit and scope of the present utility model, then all should in the protection range of the utility model claims.
Claims (2)
1. based on the constant current LED power supplies of CRC π type filtering, it is characterized in that: comprise reduction voltage circuit, rectification circuit, CRC π type filter circuit, pressure limiting circuit and anti-surge protection circuit, described reduction voltage circuit comprises the first electric capacity C1 parallel with one another and the first resistance R1; Rectification circuit is the rectifier bridge be made up of diode D1, D2, D3, D4; CRC π type filter circuit comprises the second resistance R, the second electric capacity C2 and the 3rd electric capacity C3; Pressure limiting circuit comprises pressure limiting diode D5; Anti-surge protection circuit comprises piezo-resistance RV;
One end of mains supply is connected with an input of rectifier bridge with the first resistance R1 by the first electric capacity C1 parallel with one another, the other end of mains supply is directly connected with another input of rectifier bridge, second resistance R2 is series at the cathode output end of rectifier bridge, second electric capacity C2 and the 3rd electric capacity C3 is parallel to the two ends of the second resistance R2 respectively, the second electric capacity C2 and the 3rd electric capacity C3 common ground; Pressure limiting diode D5, piezo-resistance RV and load LED lamp are parallel between two outputs of rectifier bridge successively.
2. the constant current LED power supplies based on the filtering of CRC π type according to claim 1, it is characterized in that: described load LED lamp is made up of multiple LED string, be in series with multiple LED lamp bead in each LED string, each LED string is connected in parallel between two outputs of rectifier bridge respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420661828.7U CN204131808U (en) | 2014-11-07 | 2014-11-07 | Based on the constant current LED power supplies of CRC π type filtering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420661828.7U CN204131808U (en) | 2014-11-07 | 2014-11-07 | Based on the constant current LED power supplies of CRC π type filtering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204131808U true CN204131808U (en) | 2015-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420661828.7U Expired - Fee Related CN204131808U (en) | 2014-11-07 | 2014-11-07 | Based on the constant current LED power supplies of CRC π type filtering |
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| CN (1) | CN204131808U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105338713A (en) * | 2015-11-30 | 2016-02-17 | 广东酷柏光电股份有限公司 | Non-flicker energy-saving environment-friendly LED lamp strip |
| CN110831280A (en) * | 2019-11-11 | 2020-02-21 | 吉安伊戈尔电气有限公司 | Linear constant-current LED driving anti-vibration ring wave circuit |
-
2014
- 2014-11-07 CN CN201420661828.7U patent/CN204131808U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105338713A (en) * | 2015-11-30 | 2016-02-17 | 广东酷柏光电股份有限公司 | Non-flicker energy-saving environment-friendly LED lamp strip |
| CN110831280A (en) * | 2019-11-11 | 2020-02-21 | 吉安伊戈尔电气有限公司 | Linear constant-current LED driving anti-vibration ring wave circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| 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: 20150128 Termination date: 20171107 |