CN201550329U - Constant-current driving circuit of LED street lamp - Google Patents
Constant-current driving circuit of LED street lamp Download PDFInfo
- Publication number
- CN201550329U CN201550329U CN2009202548320U CN200920254832U CN201550329U CN 201550329 U CN201550329 U CN 201550329U CN 2009202548320 U CN2009202548320 U CN 2009202548320U CN 200920254832 U CN200920254832 U CN 200920254832U CN 201550329 U CN201550329 U CN 201550329U
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- China
- Prior art keywords
- control chip
- current control
- constant
- light source
- constant current
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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
- Y02B20/72—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps in street lighting
Abstract
The utility model relates to a constant-current driving circuit of an LED street lamp. A power input end is connected with a current-limiting resistor Rs in series and then connected with an LED light source, the negative pole of which is connected with an inductor L1 in series and then connected with an Lx end of a constant-current control chip IC1; lead wires at two ends of the current-limiting resistor Rs is connected with a Vn end and an Lm end of the constant-current control chip IC1; a voltage stabilizing diode D1 is connected in series between the Lx end and the Vn end of the constant-current control chip IC1; a sampling resistor Rh is connected in series between an RTM end of the constant-current control chip and a ground wire; an RNTC end of the constant-current control chip IC1 is connected in series with a capacitor C2 and then connected with the ground wire; one path of a GND end of the constant-current control chip IC1 is connected with the ground wire, and another path is connected in series with the capacitor C1 and then connected with the power input end A; the capacitor C2 is connected in parallel with a thermistor Rt; and each light-emitting diode in the LED light source is connected in parallel with a conducting chip Dt. The constant-current driving circuit can be used for driving the LED light source of 3W.
Description
Technical field
The utility model relates to a kind of drive circuit of LED street lamp, specifically a kind of LED street lamp constant-current drive circuit.
Background technology
The drive circuit of existing LED street lamp is to adopt the constant voltage mode to drive the led light source work of multi-channel parallel.Every paths of LEDs light source in the LED street lamp generally is to be become by several light emitting diode string joint groups.When one of them light-emitting diode broke down, a paths of LEDs light source at its place will open circuit and quit work.Having after a paths of LEDs light source opens circuit, because drive circuit is to adopt constant voltage driving, so the operating current of other a few paths of LEDs light sources that are in parallel in the LED street lamp will increase thereupon.And the operating current that increases can directly cause the led light source generation light decay on these several roads, and decrease the useful life of LED street lamp.
The utility model content
The purpose of this utility model just provides a kind of LED street lamp constant-current drive circuit, to overcome the deficiency that existing constant voltage drive circuit exists, solves the light decay problem of LED street lamp, the useful life of improving the LED street lamp.
The utility model is achieved in that a kind of LED street lamp constant-current drive circuit, is connected to the positive pole of led light source behind the power input A series limiting resistor Rs, is connected to the Lx end of constant current control chip IC1 behind the negative pole tandem electric inductance L1 of led light source; Draw Vn end and Lm end that wiring is tapped into constant current control chip IC1 at the two ends of current-limiting resistance Rs; Between the Lx of constant current control chip IC1 end and Vn end, be serially connected with voltage stabilizing didoe D1, between the RTM of constant current control chip IC1 end and ground wire, be serially connected with sampling resistor Rh; The RNTC end serial connection capacitor C 2 back earth connections of constant current control chip IC1; The GND end of constant current control chip IC1 divides two-way, and one road earth connection is connected to power input A after one tunnel serial connection capacitor C 1; On capacitor C 2, be parallel with the thermistor Rt of negative temperature coefficient; Be parallel with conducting chip Dt on each light-emitting diode in led light source.
Thermistor in the utility model is near the position that is bonded in the led light source in the LED street lamp.When the lamp body temperature of LED street lamp is elevated to set temperature value, under the control of constant current control chip IC1, the output current of drive circuit will reduce with the rising of temperature, has realized that thus the constant current of led light source operating current is stable, has avoided the light decay of led light source to produce.
Conducting chip in parallel is set on each light-emitting diode in led light source, its effect is when certain light-emitting diode in the LED street lamp breaks down, operating current in this paths of LEDs light source still can be by conducting chip stream mistake, guaranteed the working properly of this paths of LEDs light source thus, guaranteed the complete of all parallel branches, made the whole LED street lamp be able to normal luminous lighting.
The utility model has been realized constant current control by the improvement driving circuit structure, has avoided the increase of the operating current of LED street lamp, has solved because of the caused light decay problem of temperature rise, and be improved the useful life of LED street lamp.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
As shown in Figure 1, the utility model is at power input A series limiting resistor Rs, and then receives the positive pole of led light source, is connected to the Lx end of constant current control chip IC1 behind the negative pole tandem electric inductance L1 of led light source; Draw Vn end and Lm end that wiring is tapped into constant current control chip IC1 at the two ends of current-limiting resistance Rs; Between the Lx of constant current control chip IC1 end and Vn end, be serially connected with voltage stabilizing didoe D1, between the RTM of constant current control chip IC1 end and ground wire, be serially connected with sampling resistor Rh; The RNTC end serial connection capacitor C 2 back earth connections of constant current control chip IC1; The GND end of constant current control chip IC1 divides two-way, and one road earth connection is connected to power input A after one tunnel serial connection capacitor C 1; On capacitor C 2, be parallel with the thermistor Rt of negative temperature coefficient; Be parallel with conducting chip Dt on each light-emitting diode in led light source.It is the integrated circuit (IC) chip of SN3352-1 that constant current control chip IC1 in the utility model adopts model.
The thermistor Rt of the bonding negative temperature coefficient in position of close led light source on the lamp body of LED street lamp is in order to carry out temperature-compensating.During work, constant current control chip IC1 constantly detects the resistance of this thermistor Rt, and along with the rising of lamp body temperature, the resistance of thermistor Rt progressively reduces.When the resistance of thermistor Rt is lower than the resistance of sampling resistor Rh (this lamp body temperature has been elevated in the temperature value of setting), the temperature compensation function of constant current control chip IC1 starts, the output current of drive circuit will reduce automatically along with the rising of lamp body temperature, working temperature with led light source has been controlled within the temperature value scope of setting thus, has avoided led light source to produce light decay.
The utility model can be imported the 10-60V direct-current working volts at power input A, and the output current of drive circuit can reach 700mA, can be used for driving the led light source of 3W.
In order to realize the remote control management of LED street lamp, the utility model can utilize an expansion light modulation pin ADJI on the constant current control chip IC1, utilize computer control, make the LED street lamp in the time period of setting, by changing the analog voltage signal of ADJI pin, realize the adjustment of led light source drive current, and then reach the purpose of adjusting LED street lamp illumination.By regularly changing the illumination (brightness on road surface) of street lamp, can prolong the useful life of LED street lamp; By conducting chip in parallel on each light-emitting diode, guaranteed the normal luminous lighting of LED street lamp.
Claims (1)
1. LED street lamp constant-current drive circuit is characterized in that being connected to behind the power input A series limiting resistor Rs positive pole of led light source, is connected to the Lx end of constant current control chip IC1 behind the negative pole tandem electric inductance L1 of led light source; Draw Vn end and Lm end that wiring is tapped into constant current control chip IC1 at the two ends of current-limiting resistance Rs; Between the Lx of constant current control chip IC1 end and Vn end, be serially connected with voltage stabilizing didoe D1, between the RTM of constant current control chip IC1 end and ground wire, be serially connected with sampling resistor Rh; The RNTC end serial connection capacitor C 2 back earth connections of constant current control chip IC1; The GND end of constant current control chip IC1 divides two-way, and one road earth connection is connected to power input A after one tunnel serial connection capacitor C 1; On capacitor C 2, be parallel with the thermistor Rt of negative temperature coefficient; Be parallel with conducting chip Dt on each light-emitting diode in led light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202548320U CN201550329U (en) | 2009-12-03 | 2009-12-03 | Constant-current driving circuit of LED street lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202548320U CN201550329U (en) | 2009-12-03 | 2009-12-03 | Constant-current driving circuit of LED street lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201550329U true CN201550329U (en) | 2010-08-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202548320U Expired - Fee Related CN201550329U (en) | 2009-12-03 | 2009-12-03 | Constant-current driving circuit of LED street lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201550329U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102378447A (en) * | 2010-08-23 | 2012-03-14 | 三星Led株式会社 | Ac driven light emitting device |
| CN102685978A (en) * | 2011-03-16 | 2012-09-19 | 松下电器产业株式会社 | Illumination apparatus |
| CN103024985A (en) * | 2011-09-26 | 2013-04-03 | 三星电机株式会社 | Light emitting diode driving apparatus |
| CN103200748A (en) * | 2013-04-27 | 2013-07-10 | 光明国际（镇江）电气有限公司 | LED (light-emitting diode) road lamp circuit capable of automatically adjusting current, voltage and temperature |
| CN103517510A (en) * | 2012-06-22 | 2014-01-15 | 主一科技股份有限公司 | LED device capable of stably emitting light |
| CN104320885A (en) * | 2014-11-04 | 2015-01-28 | 茅于海 | Temperature compensation type LED lamp drive circuit |
-
2009
- 2009-12-03 CN CN2009202548320U patent/CN201550329U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102378447A (en) * | 2010-08-23 | 2012-03-14 | 三星Led株式会社 | Ac driven light emitting device |
| US8736181B2 (en) | 2010-08-23 | 2014-05-27 | Samsung Electronics Co., Ltd. | AC driven light emitting device |
| CN102685978A (en) * | 2011-03-16 | 2012-09-19 | 松下电器产业株式会社 | Illumination apparatus |
| CN103024985A (en) * | 2011-09-26 | 2013-04-03 | 三星电机株式会社 | Light emitting diode driving apparatus |
| CN103517510A (en) * | 2012-06-22 | 2014-01-15 | 主一科技股份有限公司 | LED device capable of stably emitting light |
| CN103200748A (en) * | 2013-04-27 | 2013-07-10 | 光明国际（镇江）电气有限公司 | LED (light-emitting diode) road lamp circuit capable of automatically adjusting current, voltage and temperature |
| CN104320885A (en) * | 2014-11-04 | 2015-01-28 | 茅于海 | Temperature compensation type LED lamp drive circuit |
| CN104320885B (en) * | 2014-11-04 | 2016-08-24 | 北京埃菲莱光电科技有限公司 | Temperature compensating type LED lamp drive 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: 20100811 Termination date: 20161203 |