CN104076269A - Withstand voltage test protection circuit for LED of aluminum based circuit board - Google Patents
Withstand voltage test protection circuit for LED of aluminum based circuit board Download PDFInfo
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- CN104076269A CN104076269A CN201410348723.0A CN201410348723A CN104076269A CN 104076269 A CN104076269 A CN 104076269A CN 201410348723 A CN201410348723 A CN 201410348723A CN 104076269 A CN104076269 A CN 104076269A
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Abstract
The invention relates to a withstand voltage test protection circuit for LED of an aluminum based circuit board. The protection circuit comprises Y2 capacitor CY3 and CY4, wherein one end of the circuit is coupled between an LED isolation driving power supply circuit and an LED load; the other end of the circuit is grounded. According to the withstand voltage test protection circuit for LED of aluminum based circuit board, when withstand voltage of input lines L/N to shell (ground) is tested, certain voltage is formed between an LED+ and LED- electrode parts and the aluminum based circuit board due to leakage current, and an alternating current discharging circuit is formed among the LED+, the LED- and the aluminum based circuit board through the Y2 capacitors CY3 and CY4, so that an LED light source on the aluminum based circuit board can be protected.
Description
Technical field
The present invention relates to a kind of voltage-withstand test holding circuit, especially a kind of LED voltage-withstand test holding circuit for aluminum-based circuit board.
Background technology
LED lamp is generally acknowledged green energy conservation illumination of 21st century, and it has the following advantages compared with conventional lamp: the first, and energy-conservation, the energy consumption of LED lamp is only 1/10 of incandescent lamp, 1/2 of electricity-saving lamp; The second, the life-span is long, can reach more than 50,000 hours, is 10 times of traditional fluorescent lamp, is the more than 50 times of traditional tungsten lamp, can use for a long time and without replacing, reduces labour cost, is more suitable for the occasion of changing in being difficult to; The 3rd, environmental protection, pollution-free, in traditional light fixture, contain a large amount of mercury vapours, if broken mercury vapour can evaporate in atmosphere, but, LED daylight lamp to environment without any pollution.
Current, high-powered LED lamp all adopts aluminum-based circuit board as heat radiation substrate, and aluminium sheet radiator all directly contacts with shell, because aluminium substrate has excellent conductive performance, cause dielectric voltage withstand between LED chip electrode pin and aluminium body generally can only accomplish DC500V left and right, but LED light fixture is in the time of production test, I class light fixture and II class light fixture input line are respectively 1500VAC and 3750VAC to shell voltage-withstand test, so, in the time of voltage-withstand test, there is the possibility of damaging LED chip, and in use procedure, have certain risk.
Summary of the invention
The object of the present invention is to provide one in the time of voltage-withstand test, the LED load in aluminum-based circuit board is protected, avoid damaging the LED voltage-withstand test holding circuit for aluminum-based circuit board of LED chip.
For achieving the above object; the present invention has adopted following technical scheme: a kind of LED voltage-withstand test holding circuit for aluminum-based circuit board; this circuit is made up of Y2 capacitor C Y3, CY4, and an end of this circuit is connected between LED isolation drive power circuit and LED load, other end ground connection.
Described LED isolation drive power circuit is made up of AC-DC modular converter, Switching Power Supply and constant current output control circuit, the input termination civil power of AC-DC modular converter, the output terminal of AC-DC modular converter is connected with the input end of Switching Power Supply and constant current output control circuit, the output terminal of Switching Power Supply and constant current output control circuit is connected with the input end of filtering circuit, and Y2 capacitor C Y3, CY4 are connected between the output terminal and LED load of filtering circuit.
Described Switching Power Supply and constant current output control circuit comprise transformer T1, its output terminal connects filtering circuit by diode D1, described filtering circuit is made up of electrochemical capacitor E3, resistance R 12, resistance R 13, electrochemical capacitor E4 and common mode inductance L9, the positive pole of electrochemical capacitor E3 connects the negative electrode of diode D1, the negative pole of electrochemical capacitor E3 connects the secondary coil of transformer T1, electrochemical capacitor E3, resistance R 12, resistance R 13, electrochemical capacitor E4 parallel connection, the negative pole of a termination electrochemical capacitor E4 of Y2 capacitor C Y3, other end ground connection; The positive pole of a termination electrochemical capacitor E4 of Y2 capacitor C Y4, other end ground connection, electrochemical capacitor E4 connects LED load by common mode inductance L9.
The negative pole of a termination electrochemical capacitor E4 of Y1 capacitor C Y2, other end ground connection.
As shown from the above technical solution; the present invention test input line L/N to shell () when withstand voltage; due to the existence of leakage current; cause forming certain voltage between the electrode part of LED+ in aluminum-based circuit board, LED-and aluminum-based circuit board; by Y2 capacitor C Y3, CY4; make to form and exchange bleed-off circuit between LED+, LED-and aluminium base, so just the LED light source in aluminum-based circuit board has been played to protective effect.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of the present invention and peripheral circuit thereof.
Embodiment
For a LED voltage-withstand test holding circuit for aluminum-based circuit board, this circuit is made up of Y2 capacitor C Y3, CY4, and an end of this circuit is connected between LED isolation drive power circuit and LED load, other end ground connection.Described LED isolation drive power circuit is made up of AC-DC modular converter 1, Switching Power Supply and constant current output control circuit 2, the input termination civil power of AC-DC modular converter 1, the output terminal of AC-DC modular converter 1 is connected with the input end of constant current output control circuit 2 with Switching Power Supply, the output terminal of Switching Power Supply and constant current output control circuit 2 is connected with the input end of filtering circuit 3, Y2 capacitor C Y3, CY4 are connected between the output terminal and LED load of filtering circuit 3, as shown in Figure 1.
As shown in Figure 1, described Switching Power Supply and constant current output control circuit 2 comprise transformer T1, its output terminal connects filtering circuit 3 by diode D1, described filtering circuit 3 is made up of electrochemical capacitor E3, resistance R 12, resistance R 13, electrochemical capacitor E4 and common mode inductance L9, the positive pole of electrochemical capacitor E3 connects the negative electrode of diode D1, the negative pole of electrochemical capacitor E3 connects the secondary coil of transformer T1, electrochemical capacitor E3, resistance R 12, resistance R 13, electrochemical capacitor E4 parallel connection, the negative pole of a termination electrochemical capacitor E4 of Y2 capacitor C Y3, other end ground connection; The positive pole of a termination electrochemical capacitor E4 of Y2 capacitor C Y4, other end ground connection, electrochemical capacitor E4 connects LED load by common mode inductance L9.Electrochemical capacitor E3, E4 and common mode inductance L9 all play filter action, Y2 capacitor C Y3, CY4 for and shell () between form alternating voltage path.The negative pole of a termination electrochemical capacitor E4 of Y1 capacitor C Y2, other end ground connection, leaks into the both positive and negative polarity of LED by Y1 capacitor C Y2.
Test input line to shell () when withstand voltage; due to the existence of Y1 capacitor C Y2 in LED isolation drive power circuit; can generate Leakage Current; cause forming certain voltage between the electrode part of LED+ in aluminum-based circuit board, LED-and aluminum-based circuit board; by Y2 capacitor C Y3, the CY4 of this holding circuit; make to form and exchange bleed-off circuit between LED+, LED-and aluminum-based circuit board, so just the LED load in aluminum-based circuit board has been played to protective effect.
Claims (4)
1. for a LED voltage-withstand test holding circuit for aluminum-based circuit board, it is characterized in that: this circuit is made up of Y2 capacitor C Y3, CY4, an end of this circuit is connected between LED isolation drive power circuit and LED load, other end ground connection.
2. the LED voltage-withstand test holding circuit for aluminum-based circuit board according to claim 1, it is characterized in that: described LED isolation drive power circuit is by AC-DC modular converter (1), Switching Power Supply and constant current output control circuit (2) composition, the input termination civil power of AC-DC modular converter (1), the output terminal of AC-DC modular converter (1) is connected with the input end of constant current output control circuit (2) with Switching Power Supply, the output terminal of Switching Power Supply and constant current output control circuit (2) is connected with the input end of filtering circuit (3), Y2 capacitor C Y3, CY4 is connected between the output terminal and LED load of filtering circuit (3).
3. the LED voltage-withstand test holding circuit for aluminum-based circuit board according to claim 2, it is characterized in that: described Switching Power Supply and constant current output control circuit (2) comprise transformer T1, its output terminal connects filtering circuit (3) by diode D1, described filtering circuit (3) is by electrochemical capacitor E3, resistance R 12, resistance R 13, electrochemical capacitor E4 and common mode inductance L9 composition, the positive pole of electrochemical capacitor E3 connects the negative electrode of diode D1, the negative pole of electrochemical capacitor E3 connects the secondary coil of transformer T1, electrochemical capacitor E3, resistance R 12, resistance R 13, electrochemical capacitor E4 parallel connection, the negative pole of a termination electrochemical capacitor E4 of Y2 capacitor C Y3, other end ground connection, the positive pole of a termination electrochemical capacitor E4 of Y2 capacitor C Y4, other end ground connection, electrochemical capacitor E4 connects LED load by common mode inductance L9.
4. the LED voltage-withstand test holding circuit for aluminum-based circuit board according to claim 3, is characterized in that: the negative pole of a termination electrochemical capacitor E4 of Y1 capacitor C Y2, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410348723.0A CN104076269A (en) | 2014-07-22 | 2014-07-22 | Withstand voltage test protection circuit for LED of aluminum based circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410348723.0A CN104076269A (en) | 2014-07-22 | 2014-07-22 | Withstand voltage test protection circuit for LED of aluminum based circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104076269A true CN104076269A (en) | 2014-10-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410348723.0A Pending CN104076269A (en) | 2014-07-22 | 2014-07-22 | Withstand voltage test protection circuit for LED of aluminum based circuit board |
Country Status (1)
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| CN (1) | CN104076269A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104836272A (en) * | 2015-03-05 | 2015-08-12 | 南宁市鼎天机械制造有限公司 | Electric power storage system |
| CN105636271A (en) * | 2016-01-29 | 2016-06-01 | 深圳和而泰照明科技有限公司 | Protection circuit for LED light source and LED light source |
| CN106501687A (en) * | 2016-10-13 | 2017-03-15 | 深圳Tcl数字技术有限公司 | Lamp bar discharge test method and device |
-
2014
- 2014-07-22 CN CN201410348723.0A patent/CN104076269A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104836272A (en) * | 2015-03-05 | 2015-08-12 | 南宁市鼎天机械制造有限公司 | Electric power storage system |
| CN105636271A (en) * | 2016-01-29 | 2016-06-01 | 深圳和而泰照明科技有限公司 | Protection circuit for LED light source and LED light source |
| CN106501687A (en) * | 2016-10-13 | 2017-03-15 | 深圳Tcl数字技术有限公司 | Lamp bar discharge test method and device |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Anhui Joyo Electric Co., Ltd. Document name: Notification that Application Deemed to be Withdrawn |
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141001 |