CN204031536U - A kind of LED protective circuit - Google Patents
A kind of LED protective circuit Download PDFInfo
- Publication number
- CN204031536U CN204031536U CN201420386833.1U CN201420386833U CN204031536U CN 204031536 U CN204031536 U CN 204031536U CN 201420386833 U CN201420386833 U CN 201420386833U CN 204031536 U CN204031536 U CN 204031536U
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- CN
- China
- Prior art keywords
- capacitor
- led
- rectifier bridge
- negative pole
- secondary winding
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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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Classifications
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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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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses a kind of LED protective circuit, comprise the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, rectifier bridge stack DB, transformer T, diode D1,4750V testing power supply and LED; Transformer T comprises former limit winding A, the first secondary winding B1 and the second secondary winding B2; LED comprises LED shell and LED circuit plate; First of rectifier bridge stack DB exchanges end and the second interchange end is connected with the negative pole of 4750V testing power supply respectively, the plus earth of rectifier bridge stack DB, and the negative pole of rectifier bridge stack DB and former limit winding A link, the positive pole of 4750V testing power supply is connected with LED shell.Adopt the utility model embodiment, can be when light fixture voltage-withstand test, protection LED avoids damaging.
Description
Technical field
The utility model relates to electronic technology field, relates in particular to a kind of LED protective circuit.
Background technology
LED light fixture has obtained extensive use.LED is low voltage semiconductor device, easily by high electrical breakdown, is damaged.Safety requirement due to isolated form driving power, between driving power primary side and primary side, connect Y electric capacity, between isolating transformer primary and secondary, there is distributed capacitance simultaneously, distributed capacitance between primary and secondary and Y Capacitance parallel connection, the electric capacity existing between primary side and primary side has alternating current conducting effect.Also there is distributed capacitance in LED circuit plate, but that its capacity is compared with Y electric capacity is little, makes like this LED light fixture when voltage-withstand test, and LED circuit plate is in high potential state, and very faint creepage or arcing all likely causes that LED punctures and be damaged.
Summary of the invention
Technical problem to be solved in the utility model is, a kind of LED protective circuit is provided, can be when light fixture voltage-withstand test, and protection LED avoids damaging.
For solving above technical problem, the utility model embodiment provides a kind of LED protective circuit, comprises the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, rectifier bridge stack DB, transformer T, diode D1,4750V testing power supply and LED; Described transformer T comprises former limit winding A, the first secondary winding B1 and the second secondary winding B2; Described LED comprises LED shell and LED circuit plate;
First of described rectifier bridge stack DB exchanges end and the second interchange end is connected with the negative pole of described 4750V testing power supply respectively, the plus earth of described rectifier bridge stack DB, the negative pole of described rectifier bridge stack DB and described former limit winding A link, the positive pole of described 4750V testing power supply is connected with described LED shell;
One end of described the first capacitor C 1 is connected with described former limit winding A, and the other end of described the first capacitor C 1 is connected with described the first secondary winding B1, and described the second capacitor C 2 is in parallel with described the first capacitor C 1; The positive pole of described diode D1 is connected with described the first secondary winding B1, and the negative pole of described diode D1 is connected with one end of described the 5th capacitor C 5, and the other end of described the 5th capacitor C 5 is connected with described the second secondary winding B2;
The positive pole of described LED circuit plate is connected with the negative pole of described diode D1, and the negative pole of described LED circuit plate is connected with described the second secondary winding B2; One end of described the 3rd capacitor C 3 is connected with described LED shell, and the other end of described the 3rd capacitor C 3 is connected with described LED circuit plate, described the 4th capacitor C 4 and described the 3rd capacitor C 3 parallel connections.
Further, described LED circuit plate comprises light-emitting diode D2.
In one embodiment, one end of described the 3rd capacitor C 3 is connected with described LED shell, and the other end of described the 3rd capacitor C 3 is connected with the positive pole of described light-emitting diode D2.
In another embodiment, one end of described the 3rd capacitor C 3 is connected with described LED shell, and the other end of described the 3rd capacitor C 3 is connected with the negative pole of described light-emitting diode D2.
The LED protective circuit that the utility model embodiment provides, can reduce the current potential of LED circuit plate by additional the 4th capacitor C 4, has effectively avoided causing LED punch through damage because of creepage, arcing phenomena.
Accompanying drawing explanation
Fig. 1 is the structural representation of an embodiment of the LED protective circuit that provides of the utility model;
Fig. 2 is the structural representation of another embodiment of the LED protective circuit that provides of the utility model;
Fig. 3 is the structural representation of the first equivalent capacity of the LED protective circuit that provides of the utility model;
Fig. 4 is the structural representation of the second equivalent capacity of the LED protective circuit that provides of the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described.
Referring to Fig. 1, it is the structural representation of an embodiment of the LED protective circuit that provides of the utility model.
The present embodiment provides a kind of LED protective circuit, comprises the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, rectifier bridge stack DB, transformer T, diode D1,4750V testing power supply and LED; Described transformer T comprises former limit winding A, the first secondary winding B1 and the second secondary winding B2; Described LED comprises LED shell 101 and LED circuit plate 102;
First of described rectifier bridge stack DB exchanges end and the second interchange end is connected with the negative pole of described 4750V testing power supply respectively, the plus earth of described rectifier bridge stack DB, the negative pole of described rectifier bridge stack DB and described former limit winding A link, the positive pole of described 4750V testing power supply is connected with described LED shell 101;
One end of described the first capacitor C 1 is connected with described former limit winding A, and the other end of described the first capacitor C 1 is connected with described the first secondary winding B1, and described the second capacitor C 2 is in parallel with described the first capacitor C 1; The positive pole of described diode D1 is connected with described the first secondary winding B1, and the negative pole of described diode D1 is connected with one end of described the 5th capacitor C 5, and the other end of described the 5th capacitor C 5 is connected with described the second secondary winding B2;
The positive pole of described LED circuit plate 102 is connected with the negative pole of described diode D1, and the negative pole of described LED circuit plate 102 is connected with described the second secondary winding B2; One end of described the 3rd capacitor C 3 is connected with described LED shell 101, and the other end of described the 3rd capacitor C 3 is connected with described LED circuit plate 102, described the 4th capacitor C 4 and described the 3rd capacitor C 3 parallel connections.
Further, described LED circuit plate 102 comprises light-emitting diode D2.
In one embodiment, one end of described the 3rd capacitor C 3 is connected with described LED shell 101, and the other end of described the 3rd capacitor C 3 is connected with the positive pole of described light-emitting diode D2.
The operation principle of the LED protective circuit below the utility model being provided is elaborated.
As shown in Figure 3 and Figure 4, because the capacity of the first capacitor C 1 is less than the capacity of the second capacitor C 2, the capacity of the 3rd capacitor C 3 is less than the capacity of the 4th capacitor C 4, therefore can ignore the first capacitor C 1 and the 3rd capacitor C 3, by the second capacitor C 2 and the 4th capacitor C 4 series connection access 4750V testing power supplies.According to principle of capacitive divider, the capacity of the 4th capacitor C 4 is larger, and the 4th capacitor C 4 both end voltage are less so, and LED circuit plate 102 current potentials are lower.When LED circuit plate 102 current potentials are enough low, just can avoid damaging because creepage, arcing phenomena cause LED, thereby play the effect of protecting LED.
Referring to Fig. 2, it is the structural representation of another embodiment of the LED protective circuit that provides of the utility model.
One end of described the 3rd capacitor C 3 is connected with described LED shell 101, and the other end of described the 3rd capacitor C 3 is connected with the negative pole of described light-emitting diode D2.
The above is preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications are also considered as protection range of the present utility model.
Claims (4)
1. a LED protective circuit, is characterized in that, comprises the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, rectifier bridge stack DB, transformer T, diode D1,4750V testing power supply and LED; Described transformer T comprises former limit winding A, the first secondary winding B1 and the second secondary winding B2; Described LED comprises LED shell and LED circuit plate;
First of described rectifier bridge stack DB exchanges end and the second interchange end is connected with the negative pole of described 4750V testing power supply respectively, the plus earth of described rectifier bridge stack DB, the negative pole of described rectifier bridge stack DB and described former limit winding A link, the positive pole of described 4750V testing power supply is connected with described LED shell;
One end of described the first capacitor C 1 is connected with described former limit winding A, and the other end of described the first capacitor C 1 is connected with described the first secondary winding B1, and described the second capacitor C 2 is in parallel with described the first capacitor C 1; The positive pole of described diode D1 is connected with described the first secondary winding B1, and the negative pole of described diode D1 is connected with one end of described the 5th capacitor C 5, and the other end of described the 5th capacitor C 5 is connected with described the second secondary winding B2;
The positive pole of described LED circuit plate is connected with the negative pole of described diode D1, and the negative pole of described LED circuit plate is connected with described the second secondary winding B2; One end of described the 3rd capacitor C 3 is connected with described LED shell, and the other end of described the 3rd capacitor C 3 is connected with described LED circuit plate, described the 4th capacitor C 4 and described the 3rd capacitor C 3 parallel connections.
2. LED protective circuit as claimed in claim 1, is characterized in that, described LED circuit plate comprises light-emitting diode D2.
3. LED protective circuit as claimed in claim 2, is characterized in that, one end of described the 3rd capacitor C 3 is connected with described LED shell, and the other end of described the 3rd capacitor C 3 is connected with the positive pole of described light-emitting diode D2.
4. LED protective circuit as claimed in claim 2, is characterized in that, one end of described the 3rd capacitor C 3 is connected with described LED shell, and the other end of described the 3rd capacitor C 3 is connected with the negative pole of described light-emitting diode D2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420386833.1U CN204031536U (en) | 2014-07-15 | 2014-07-15 | A kind of LED protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420386833.1U CN204031536U (en) | 2014-07-15 | 2014-07-15 | A kind of LED protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204031536U true CN204031536U (en) | 2014-12-17 |
Family
ID=52071357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420386833.1U Expired - Fee Related CN204031536U (en) | 2014-07-15 | 2014-07-15 | A kind of LED protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204031536U (en) |
-
2014
- 2014-07-15 CN CN201420386833.1U patent/CN204031536U/en not_active Expired - Fee Related
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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 |
Granted publication date: 20141217 Termination date: 20190715 |
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| CF01 | Termination of patent right due to non-payment of annual fee |