CN105578645A - Over-current protection method of LED driving power supply - Google Patents
Over-current protection method of LED driving power supply Download PDFInfo
- Publication number
- CN105578645A CN105578645A CN201510954264.5A CN201510954264A CN105578645A CN 105578645 A CN105578645 A CN 105578645A CN 201510954264 A CN201510954264 A CN 201510954264A CN 105578645 A CN105578645 A CN 105578645A
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- relay
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- moving contact
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention relates to an over-current protection method of an LED driving power supply. An over-current protection circuit comprises MOS tubes Q3 and Q4, resistors R1, R2, R3, and R4, and a relay K1. A grid electrode of the MOS tube Q3 is connected with a moving contact of the relay through the resistor R1 and is grounded through R4. A drain electrode of the MOS tube Q3 is connected with the moving contact of the relay K1 through the resistor R2, and a source electrode of the MOS tube Q3 is grounded. A drain electrode of the MOS tube Q4 is connected with a coil of the relay K1, a grid electrode of the MOS tube Q4 is connected with the drain electrode of the MOS tube Q3, and the source electrode of the MOS tube Q4 is grounded. The moving contact of the relay K1 is connected with a power supply. A first static contact of the relay K1 is connected with an anode of a light emitting diode D1, and a second static contact of the relay K1 is hung in the air. According to the invention, the circuit structure is simple, the cost is low, safety and reliability are realized, and effective protection is provided to an LED lamp.
Description
Technical field
The present invention relates to LED technology field, be specifically related to a kind of over-current protection method of LED drive power.
Background technology
LED is as new type light source; it has energy-saving and environmental protection, efficiently feature; technology is ripe and be applied to every field, and LED is widely used as lighting source, and LED is a kind of current mode luminescent device; very responsive to the electric current flowing through self; require relative also very harsh, so in order to ensure that LED reliablely and stablely works, need to add overcurrent protection in LED drive circuit; effectively protect when LED overcurrent, prevent electric current excessive and damage LED.
Current current foldback circuit generally adopts single-chip microcomputer sampled voltage and exports control; although adopt Single-chip Controlling have efficiency high, use the advantages such as flexible; but single-chip microcomputer needs to coordinate the multiple device such as a reference source, sample circuit could work, therefore have take up room greatly, complex structure, the shortcomings such as with high costs.
Summary of the invention
The object of the present invention is to provide a kind of over-current protection method of LED drive power, to solve take up room large, complex structure, problem with high costs that present current foldback circuit exists.
For achieving the above object, present invention employs following technical scheme:
A kind of over-current protection method of LED drive power, LED overcurrent protection circuit is adopted to carry out overcurrent protection, described current foldback circuit, comprise metal-oxide-semiconductor Q3, Q4, resistance R1, R2, R3, R4, relay K 1, the grid of described metal-oxide-semiconductor Q3 is connected with the moving contact of relay through resistance R1, and through R4 ground connection, the drain electrode of metal-oxide-semiconductor Q3 is connected with the moving contact of relay K 1 through resistance R2, its source ground, the drain electrode of metal-oxide-semiconductor Q4 is connected with the coil of relay K 1, its grid is connected with the drain electrode of metal-oxide-semiconductor Q3, its source ground, the moving contact of relay K 1 is connected with power supply, first fixed contact of relay K 1 is connected with the D1 anode of light-emitting diode through LED drive circuit, its second fixed contact is unsettled,
This over-current protection method, comprises the following steps: switch on power, and power supply is by divider resistance R1 and semistor R4 dividing potential drop, and for the grid of metal-oxide-semiconductor Q3 provides voltage, metal-oxide-semiconductor Q3 keeps off state, and metal-oxide-semiconductor Q4 enters conducting state; The electromagnet coil loop of relay K 1 is connected, and its moving contact 1 and the second contact 2 disconnect, and moving contact 1 and the first fixed contact 3 close, for follow-up LED drive circuit provides power supply; When LED overcurrent, the electromagnet coil circuit closed of relay K 1, the moving contact 1 of the switch of relay K 1 and the first fixed contact 3 disconnect, and the moving contact 1 of the switch of relay K 1 and the second fixed contact 2 engage, and cut off the electric power loop of follow-up LED drive circuit.
As shown from the above technical solution; the present invention is by the electromagnet coil loop conducting of relay K 1; first contact of the switch of relay K 1 and the second contact disconnect; first contact connects the 3rd contact; cut off the electric power loop of follow-up LED drive circuit; realize overcurrent protection function, this current foldback circuit structure is simple, with low cost, safe and reliable, can provide available protecting for LED lamp.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described:
As shown in Figure 1, the LED overcurrent protection circuit of the present embodiment, comprise metal-oxide-semiconductor Q3, Q4, resistance R1, R2, R3, R4, relay K 1, the grid of metal-oxide-semiconductor Q3 is connected with the moving contact of relay through resistance R1, and through R4 ground connection, the drain electrode of metal-oxide-semiconductor Q3 is connected with the moving contact of relay K 1 through resistance R2, its source ground, the drain electrode of metal-oxide-semiconductor Q4 is connected with the coil of relay K 1, its grid is connected with the drain electrode of metal-oxide-semiconductor Q3, its source ground, the moving contact of relay K 1 is connected with power supply, first fixed contact of relay K 1 is connected with the D1 anode of light-emitting diode, its second fixed contact is unsettled.
In the present embodiment, the first fixed contact of output and relay K 1 that current foldback circuit also comprises the drive circuit of LED drive circuit and electric capacity C1, LED is connected, and its output is connected with the anode of the diode D1 that gives out light.One end of this electric capacity C1 is connected between power supply and resistance R1, its other end ground connection.
Operation principle: after switching on power, power supply is by divider resistance R1 and semistor R4 dividing potential drop, for the grid of metal-oxide-semiconductor Q3 provides voltage, because now LED temperature is lower, thermistor R4 resistance is less, so the voltage that obtains of metal-oxide-semiconductor Q3 grid is far below the threshold voltage of its conducting, therefore metal-oxide-semiconductor Q3 keeps off state, so power supply then by divider resistance R2 and divider resistance R3 for metal-oxide-semiconductor Q4 grid provides voltage, this voltage is much larger than the threshold voltage of its conducting, therefore metal-oxide-semiconductor Q4 enters conducting state.The electromagnet coil loop of relay K 1 is connected, and the moving contact 1 of the switch of relay K 1 and the second contact 2 disconnect, and moving contact 1 and the first fixed contact 3 close, for follow-up LED drive circuit provides power supply; When LED overcurrent; the electromagnet coil circuit closed of relay K 1, the moving contact 1 of the switch of relay K 1 and the first fixed contact 3 disconnect, and the moving contact 1 of the switch of relay K 1 and the second fixed contact 2 engage; cut off the electric power loop of follow-up LED drive circuit, realize overcurrent protection function.
Above-described embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection range that claims of the present invention determines.
Claims (1)
1. the over-current protection method of a LED drive power, it is characterized in that: adopt LED overcurrent protection circuit to carry out overcurrent protection, described current foldback circuit, comprise metal-oxide-semiconductor Q3, Q4, resistance R1, R2, R3, R4, relay K 1, the grid of described metal-oxide-semiconductor Q3 is connected with the moving contact of relay through resistance R1, and through R4 ground connection, the drain electrode of metal-oxide-semiconductor Q3 is connected with the moving contact of relay K 1 through resistance R2, its source ground, the drain electrode of metal-oxide-semiconductor Q4 is connected with the coil of relay K 1, its grid is connected with the drain electrode of metal-oxide-semiconductor Q3, its source ground, the moving contact of relay K 1 is connected with power supply, first fixed contact of relay K 1 is connected with the D1 anode of light-emitting diode through LED drive circuit, its second fixed contact is unsettled,
This over-current protection method, comprises the following steps: switch on power, and power supply is by divider resistance R1 and semistor R4 dividing potential drop, and for the grid of metal-oxide-semiconductor Q3 provides voltage, metal-oxide-semiconductor Q3 keeps off state, and metal-oxide-semiconductor Q4 enters conducting state; The electromagnet coil loop of relay K 1 is connected, and its moving contact 1 and the second contact 2 disconnect, and moving contact 1 and the first fixed contact 3 close, for follow-up LED drive circuit provides power supply; When LED overcurrent, the electromagnet coil circuit closed of relay K 1, the moving contact 1 of the switch of relay K 1 and the first fixed contact 3 disconnect, and the moving contact 1 of the switch of relay K 1 and the second fixed contact 2 engage, and cut off the electric power loop of follow-up LED drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510954264.5A CN105578645A (en) | 2015-12-20 | 2015-12-20 | Over-current protection method of LED driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510954264.5A CN105578645A (en) | 2015-12-20 | 2015-12-20 | Over-current protection method of LED driving power supply |
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| Publication Number | Publication Date |
|---|---|
| CN105578645A true CN105578645A (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510954264.5A Pending CN105578645A (en) | 2015-12-20 | 2015-12-20 | Over-current protection method of LED driving power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106439754A (en) * | 2016-10-12 | 2017-02-22 | 成都赛昂电子科技有限公司 | Multi-circuit processing type intelligent control system |
| CN106655100A (en) * | 2016-10-12 | 2017-05-10 | 成都赛昂电子科技有限公司 | Intelligent control system based on over current protection circuit |
| CN110071559A (en) * | 2019-05-05 | 2019-07-30 | 维沃移动通信有限公司 | A kind of charging circuit and mobile terminal |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101588127A (en) * | 2008-05-20 | 2009-11-25 | 於文 | Simplest switch voltage-stabilizing power supply with short circuit overcurrent and overheating protection |
| CN103024973A (en) * | 2011-09-23 | 2013-04-03 | 海洋王（东莞）照明科技有限公司 | LED (Light-Emitting Diode) lamp and overcurrent protection circuit thereof |
| CN203504844U (en) * | 2013-10-21 | 2014-03-26 | 上海欧切斯实业有限公司 | LED constant voltage light modulator short circuit and overcurrent protection circuit |
| US20150156846A1 (en) * | 2013-11-25 | 2015-06-04 | Shenzhen China Star Optoelectronics Technology Co. Ltd | Over-current protection circuit, led backlight driving circuit and liquid crystal device |
-
2015
- 2015-12-20 CN CN201510954264.5A patent/CN105578645A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101588127A (en) * | 2008-05-20 | 2009-11-25 | 於文 | Simplest switch voltage-stabilizing power supply with short circuit overcurrent and overheating protection |
| CN103024973A (en) * | 2011-09-23 | 2013-04-03 | 海洋王（东莞）照明科技有限公司 | LED (Light-Emitting Diode) lamp and overcurrent protection circuit thereof |
| CN203504844U (en) * | 2013-10-21 | 2014-03-26 | 上海欧切斯实业有限公司 | LED constant voltage light modulator short circuit and overcurrent protection circuit |
| US20150156846A1 (en) * | 2013-11-25 | 2015-06-04 | Shenzhen China Star Optoelectronics Technology Co. Ltd | Over-current protection circuit, led backlight driving circuit and liquid crystal device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106439754A (en) * | 2016-10-12 | 2017-02-22 | 成都赛昂电子科技有限公司 | Multi-circuit processing type intelligent control system |
| CN106655100A (en) * | 2016-10-12 | 2017-05-10 | 成都赛昂电子科技有限公司 | Intelligent control system based on over current protection circuit |
| CN110071559A (en) * | 2019-05-05 | 2019-07-30 | 维沃移动通信有限公司 | A kind of charging circuit and mobile terminal |
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| C06 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20160511 |