CN201414240Y - Buffer current-limiting circuit for LED illuminating lamp direct-current power source - Google Patents
Buffer current-limiting circuit for LED illuminating lamp direct-current power source Download PDFInfo
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- CN201414240Y CN201414240Y CN2009200578213U CN200920057821U CN201414240Y CN 201414240 Y CN201414240 Y CN 201414240Y CN 2009200578213 U CN2009200578213 U CN 2009200578213U CN 200920057821 U CN200920057821 U CN 200920057821U CN 201414240 Y CN201414240 Y CN 201414240Y
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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 relates to a buffer current-limiting circuit for an LED illuminating lamp direct-current power source, comprising a current-limiting resistor R3 connected in series in an output circuit of a rectification circuit D1. Two ends of the resistor R3 are connected in parallel with an equivalent switch control circuit; at the moment that the LED illuminating lamp is on, the equivalent switch control circuit is in an off state and the current of the output circuit of the rectification circuit D1 is restricted by the resistor R3; and when the LED illuminating lamp is in normal operation, the equivalent switch control circuit is in an on state and the resistor R3 is shorted in the output circuit of the rectification circuit D1. The utility model ensures that the current of the LEDlamp loop is restricted at the moment of start by means of the serially connected current-limiting resistor R3 and the switch circuit connected in parallel at the two ends of the current-limiting resistor R3, thereby effectively preventing the LED lamp from being punctured or abnormally aged at the moment of start and prolonging the service life of the LED lamp, and accordingly can be widely applied in a power control system of the LED lamp.
Description
Technical field
The utility model relates to the control circuit of LED illuminating lamp DC power supply, particularly the start-up control circuit of LED illuminating lamp DC power supply
Background technology
Existing LED illuminating lamp DC power supply control circuit as shown in Figure 1, comprises commutating circuit D1 and is connected in parallel on the filter capacitor C1 of described commutating circuit D1 output that the load end of described commutating circuit D1 inserts control switch K1 and light emitting LED lamp.In this kind circuit kind, be example to connect 1 LED constant current switch power supply to 3 1W: first energized, before K switch 1 closure, electrochemical capacitor C2 two ends charging voltage is about VCC.When load is 1,2 or 3 LED lamp, rigidly connect logically in K switch 1, just know that by I ∝ C * Du/Dt computing formula electrochemical capacitor C2 both end voltage gives the discharge of LED lamp rapidly, instantaneous large-current may surpass LED lamp threshold limit value and damage the LED lamp.Preventing that for this reason the LED circuit for lamp is subjected to the impact of bigger pulse current when starting, is the problem that must solve.
Summary of the invention
In order to prevent that the LED circuit for lamp is subjected to the impact of bigger pulse current when starting, the utility model has designed a kind of buffering current-limiting circuit of the LED of being used for illuminating lamp DC power supply, and described DC power supply circuit comprises commutating circuit D1 and is connected in parallel on the filter capacitor C1 of described commutating circuit D1 output; It is characterized in that, described buffering current-limiting circuit comprises current-limiting resistance R3, described current-limiting resistance R3 is connected in the output loop of described commutating circuit D1, two ends at described current-limiting resistance R3 also are parallel with the equivalent switch control circuit, and described equivalent switch control circuit presents conducting or ends two kinds of operating states under the both end voltage control of described filter capacitor C1; Wherein connect moment at the LED illuminating lamp, described equivalent switch control circuit presents cut-off state, by described current-limiting resistance R3 the electric current of the output loop of described commutating circuit D1 is limited; When LED illuminating lamp operate as normal, described equivalent switch control circuit presents conducting state, and described current-limiting resistance R3 is given short circuit in the output loop of described commutating circuit D1.
Further technical scheme can also be that the load end of described commutating circuit D1 comprises control switch K1 and the light emitting LED lamp more than 1.
Further technical scheme can also be that described equivalent switch control circuit comprises the first triode Q1 and the second triode Q2; Wherein resistance R 4 is connected between the positive pole of the collector electrode of the described second triode Q2 and described commutating circuit D1, between the positive pole of resistance R 5 and base stage that is connected on the described second triode Q2 after voltage stabilizing didoe ZD3 connects and described commutating circuit D1, charging capacitor C3 is connected between the collector electrode and emitter of the described second triode Q2, also be connected between the base stage and emitter of the described first triode Q1, the collector electrode of the described first triode Q1 and emitter are connected on the two ends of described current-limiting resistance R3.
Further technical scheme can also be that the described first triode Q1 or the second triode Q2 are the MOS switching tubes.
Technique scheme is by means of the current-limiting resistance R3 of series connection and be connected in parallel on the switching circuit at current-limiting resistance R3 two ends, the electric current in LED lamp loop was inhibited in the moment that starts, prevent that effectively the LED lamp from being worn out in the moment that starts breakdown or improperly, prolonged the useful life of LED lamp.
Owing to the utlity model has These characteristics, thereby can be widely used in the power control system of LED lamp.
Description of drawings
Fig. 1 is the schematic diagram of the existing LED lamp power control circuit of using always;
Fig. 2 is the schematic diagram that increases the buffering current-limiting circuit in LED lamp power control circuit;
Fig. 3 is the structural representation of the equivalent switch circuit of buffer control circuit.
Embodiment
As shown in Figure 2, a kind of buffering current-limiting circuit that is used for LED illuminating lamp DC power supply, described DC power supply circuit comprises commutating circuit D1 and is connected in parallel on the electrochemical capacitor C1 that the filtering of described commutating circuit D1 output is used that the load end of described commutating circuit D1 comprises the light emitting LED lamp of control switch K1 and 3 series connection.The buffering current-limiting circuit is set in described electric power loop.Described buffering current-limiting circuit comprises current-limiting resistance R3 and equivalent switch circuit.Wherein said current-limiting resistance R3 is connected on the negative pole of the output loop of described commutating circuit D1, two ends at described current-limiting resistance R3 also are parallel with the equivalent switch control circuit, and described equivalent switch control circuit presents conducting or ends two kinds of operating states under the both end voltage control of described filter capacitor C1; Wherein connect moment at the LED illuminating lamp, described equivalent switch control circuit presents cut-off state, by described current-limiting resistance R3 the electric current of the output loop of described commutating circuit D1 is limited; When LED illuminating lamp operate as normal, described equivalent switch control circuit presents conducting state, and described current-limiting resistance R3 is given short circuit in the output loop of described commutating circuit D1.
As shown in Figure 3, described equivalent switch control circuit comprises the first triode Q1 and the second triode Q2; Wherein resistance R 4 is connected between the positive pole of the collector electrode of the described second triode Q2 and described commutating circuit D1, between the positive pole of resistance R 5 and base stage that is connected on the described second triode Q2 after voltage stabilizing didoe ZD3 connects and described commutating circuit D1, charging capacitor C3 is connected between the collector electrode and emitter of the described second triode Q2, also be connected between the base stage and emitter of the described first triode Q1, the collector electrode of the described first triode Q1 and emitter are connected on the two ends of described current-limiting resistance R3.
According to the foregoing circuit structure, when did not close a floodgate when K switch 1 (1), described filter capacitor C2 two ends charging voltage equaled supply voltage VCC.Described electric power loop D1 is C 3 chargings by R4, correspondingly sets up voltage difference at the two ends of C3, thereby makes the described first triode Q1 conducting, and the second triode Q2 ends, and this moment, described current-limiting resistance R3 was in by the state of short circuit.(2) in moment of described K switch 1 closure, described filter capacitor C1 emits big pulse current in moment, wherein have power supply circuits to be this moment: source current is through resistance R 5, again through voltage-stabiliser tube ZD3, give second triode Q2 power supply then, make the second triode Q2 enter the saturation conduction state rapidly, make the A node be " low level ", be that voltage between described first triode Q1 emitter and base stage is lower than conducting voltage, the described first triode Q1 is in cut-off state; Electric current through K switch 1, LED lamp, is got back to "-" of filter capacitor C2 by "+" of described filter capacitor C2 again through the bigger described current-limiting resistance R3 of resistance; (3) reduce and be lower than the minimum V of voltage-stabiliser tube ZD3 gradually when filter capacitor C2 both end voltage
ZDuring value, the described second triode Q2 is by the saturated cut-off state that enters rapidly, the A node becomes " high level ", be that the emitter of the described first triode Q1 and the voltage between base stage are higher than conducting voltage, make the described first triode Q1 by by entering saturation condition rapidly, be equivalent to the bigger current-limiting resistance R3 of resistance is given short circuit.
As another embodiment, the described first triode Q1 or the second triode Q2 can substitute with the MOS switching tube, and the parameter of corresponding electric device is also adjusted thereupon
Claims (4)
1. buffering current-limiting circuit that is used for LED illuminating lamp DC power supply, described DC power supply circuit comprises commutating circuit D1 and is connected in parallel on the filter capacitor C1 of described commutating circuit D1 output; It is characterized in that, described buffering current-limiting circuit comprises current-limiting resistance R3, described current-limiting resistance R3 is connected in the output loop of described commutating circuit D1, two ends at described current-limiting resistance R3 also are parallel with the equivalent switch control circuit, and described equivalent switch control circuit presents conducting or ends two kinds of operating states under the both end voltage control of described filter capacitor C1; Wherein connect moment at the LED illuminating lamp, described equivalent switch control circuit presents cut-off state, by described current-limiting resistance R3 the electric current of the output loop of described commutating circuit D1 is limited; When LED illuminating lamp operate as normal, described equivalent switch control circuit presents conducting state, and described current-limiting resistance R3 is given short circuit in the output loop of described commutating circuit D1.
2. buffering current-limiting control circuit according to claim 1 is characterized in that, the load end of described commutating circuit D1 comprises control switch K1 and the light emitting LED lamp more than 1.
3. buffering current-limiting control circuit according to claim 1 and 2 is characterized in that, described equivalent switch control circuit comprises the first triode Q1 and the second triode Q2; Wherein resistance R 4 is connected between the positive pole of the collector electrode of the described second triode Q2 and described commutating circuit D1, between the positive pole of resistance R 5 and base stage that is connected on the described second triode Q2 after voltage stabilizing didoe ZD3 connects and described commutating circuit D1, charging capacitor C3 is connected between the collector electrode and emitter of the described second triode Q2, also be connected between the base stage and emitter of the described first triode Q1, the collector electrode of the described first triode Q1 and emitter are connected on the two ends of described current-limiting resistance R3.
4. buffering current-limiting control circuit according to claim 3 is characterized in that, the described first triode Q1 or the second triode Q2 are the MOS switching tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200578213U CN201414240Y (en) | 2009-06-04 | 2009-06-04 | Buffer current-limiting circuit for LED illuminating lamp direct-current power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200578213U CN201414240Y (en) | 2009-06-04 | 2009-06-04 | Buffer current-limiting circuit for LED illuminating lamp direct-current power source |
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| Publication Number | Publication Date |
|---|---|
| CN201414240Y true CN201414240Y (en) | 2010-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200578213U Expired - Lifetime CN201414240Y (en) | 2009-06-04 | 2009-06-04 | Buffer current-limiting circuit for LED illuminating lamp direct-current power source |
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| CN (1) | CN201414240Y (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102685978A (en) * | 2011-03-16 | 2012-09-19 | 松下电器产业株式会社 | Illumination apparatus |
| CN102709871A (en) * | 2012-06-25 | 2012-10-03 | 英飞特电子（杭州）股份有限公司 | Impulse current inhibiting circuit and supply circuit |
| CN103025029A (en) * | 2012-12-28 | 2013-04-03 | 伊戈尔电气股份有限公司 | Improved buffering and current limiting circuit for direct-current power source of LED lamp |
| CN103369760A (en) * | 2012-03-26 | 2013-10-23 | 海洋王（东莞）照明科技有限公司 | Lighting-control circuit and lamp |
| CN103548422A (en) * | 2011-03-18 | 2014-01-29 | Lg伊诺特有限公司 | Input voltage transfer apparatus for light emitting diode lighting system |
| CN104053281A (en) * | 2014-06-16 | 2014-09-17 | 京东方光科技有限公司 | Lighting jig |
| CN104218551A (en) * | 2013-05-30 | 2014-12-17 | 海洋王（东莞）照明科技有限公司 | Lamp surge protection circuit and lamp |
| CN108879594A (en) * | 2018-08-14 | 2018-11-23 | 郑州云海信息技术有限公司 | A kind of overcurrent protection circuit of server and its POL |
| CN110247614A (en) * | 2014-04-16 | 2019-09-17 | 佛山市建准电子有限公司 | Circuit for controlling motor |
-
2009
- 2009-06-04 CN CN2009200578213U patent/CN201414240Y/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102685978A (en) * | 2011-03-16 | 2012-09-19 | 松下电器产业株式会社 | Illumination apparatus |
| US8981659B2 (en) | 2011-03-18 | 2015-03-17 | Lg Innotek Co., Ltd. | Input voltage transfer apparatus for light emitting diode lighting system |
| CN103548422A (en) * | 2011-03-18 | 2014-01-29 | Lg伊诺特有限公司 | Input voltage transfer apparatus for light emitting diode lighting system |
| CN103548422B (en) * | 2011-03-18 | 2015-09-30 | Lg伊诺特有限公司 | The input voltage transmission equipment of LED illumination system |
| CN103369760A (en) * | 2012-03-26 | 2013-10-23 | 海洋王（东莞）照明科技有限公司 | Lighting-control circuit and lamp |
| CN103369760B (en) * | 2012-03-26 | 2016-06-22 | 海洋王（东莞）照明科技有限公司 | A kind of emission control circuit and light fixture |
| CN102709871A (en) * | 2012-06-25 | 2012-10-03 | 英飞特电子（杭州）股份有限公司 | Impulse current inhibiting circuit and supply circuit |
| CN102709871B (en) * | 2012-06-25 | 2014-12-10 | 英飞特电子（杭州）股份有限公司 | Impulse current inhibiting circuit and supply circuit |
| CN103025029A (en) * | 2012-12-28 | 2013-04-03 | 伊戈尔电气股份有限公司 | Improved buffering and current limiting circuit for direct-current power source of LED lamp |
| CN104218551A (en) * | 2013-05-30 | 2014-12-17 | 海洋王（东莞）照明科技有限公司 | Lamp surge protection circuit and lamp |
| CN104218551B (en) * | 2013-05-30 | 2017-12-01 | 海洋王（东莞）照明科技有限公司 | Light fixture surge protection circuit and light fixture |
| CN110247614A (en) * | 2014-04-16 | 2019-09-17 | 佛山市建准电子有限公司 | Circuit for controlling motor |
| CN110247614B (en) * | 2014-04-16 | 2021-05-11 | 北海建准电子有限公司 | Motor control circuit |
| CN104053281A (en) * | 2014-06-16 | 2014-09-17 | 京东方光科技有限公司 | Lighting jig |
| US9599678B2 (en) | 2014-06-16 | 2017-03-21 | Boe Technology Group Co., Ltd. | Testing system for backlight source |
| CN108879594A (en) * | 2018-08-14 | 2018-11-23 | 郑州云海信息技术有限公司 | A kind of overcurrent protection circuit of server and its POL |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: EAGLERISE ELECTRIC CO., LTD. Free format text: FORMER NAME: FOSHAN EAGLERISE ELECTRIC + ELECTRONIC CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 528000, A3, Guicheng science and Technology Park, Jian Ping Road, Nanhai District, Guangdong, Foshan Patentee after: Eaglerise Electric & Electronic (China) Co., Ltd. Address before: 528000, A3, Guicheng science and Technology Park, Jian Ping Road, Nanhai District, Guangdong, Foshan Patentee before: Foshan Eaglerise Electric & Electronic Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100224 |