CN104254173A - LED (light emitting diode) constant-current drive circuit - Google Patents
LED (light emitting diode) constant-current drive circuit Download PDFInfo
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- CN104254173A CN104254173A CN201310460367.7A CN201310460367A CN104254173A CN 104254173 A CN104254173 A CN 104254173A CN 201310460367 A CN201310460367 A CN 201310460367A CN 104254173 A CN104254173 A CN 104254173A
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- switch element
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- led
- constant current
- current driver
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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 invention discloses an LED (light emitting diode) constant-current drive circuit used for providing constant-current drive for LED loads. The LED constant-current drive circuit comprises a self-excited converter which controls the duty ratio of the constant-current drive circuit, and the self-excited converter comprises a first switch element and a trigger type control circuit connected with the first switch element. The trigger type control circuit absorbs current of the first switch element to shorten off time of the first switch element and comprises a second switch element and a third switch element, and the second switch element and the third switch element trigger each other.
Description
[technical field]
The present invention relates to a kind of constant-current drive circuit, especially a kind of constant-current drive circuit of lighting device.
[background technology]
It is that optimal light source goes to replace traditional light source that the internal characteristics of LED determines it, and it has purposes widely.It is little that LED has volume, and power consumption is low, long service life, high brightness, low in calories, environmental protection, the advantages such as controllability is strong.But due to the semiconductor device that LED is characteristic sensitivity, again there is negative temperature characteristic, thus need in the application to carry out stable current constant control to it.
RCC(Ringing choke converter) auto-excitation type transducer is a kind of a kind of switch power supply topological structure adopting auto-excitation type concussion mode to control Energy transmission.Please refer to shown in Fig. 1, the general principle of RCC control circui current constant is when the first switch element Q1 winding T1-B positively biased after conducting under start-up circuit effect, drives the further saturation conduction of the first switch element Q1.When the peak current flowing through the first switch element Q1 reaches threshold value rear drive second switch element Q2 conducting, thus the drive current of diverting switch element Q1 makes the first switch element Q1 exit from saturation region enters by district.
RCC circuit realizes the constant of output current by controlling inductance peak current.Output current I and peak current I
peakrelation QUOTE
?
, when t equals T, the mean value of output current I equals peak current I
peak1/2nd.Due to the impact of component variations and other parameters, t and T is incomplete same, therefore QUOTE
?
.
The shutoff of triode is all to amplifying again to a process of cut-off by saturation conduction.At RCC peak current I
peakin control, due to the impact of memory time, the mean value of output current I is not equal to peak current I
peak1/2nd.Second switch element Q2 is promoted when turning off the first switch element Q1 after current sampling resistor R6 both end voltage reaches threshold value, because the saturated current sampling resistor R6 both end voltage that causes of moving back of the first switch element Q1 declines, the ability causing second switch element Q2 to absorb the first switch element Q1 base current that declines second switch element Q2 driving voltage reduces, first switch element Q1 postpones to turn off, thus result in increase memory time.
Therefore, in order to overcome above-mentioned defect, be necessary the constant current driver circuit for LED that a kind of improvement is provided.
[summary of the invention]
The object of the present invention is to provide a kind of constant current driver circuit for LED.
To achieve these goals, the present invention adopts following technical scheme: a kind of constant current driver circuit for LED, for LED load provides constant current to drive, comprise the auto-excitation type transducer controlling described constant-current drive circuit duty ratio, the trigger-type control circuit that described auto-excitation type transducer comprises the first switch element and is connected with described first switch element, described trigger-type control circuit absorbs the electric current of described first switch element to shorten the turn-off time of described first switch element, and described trigger-type control circuit comprises the second switch element, the 3rd switch element that trigger mutually.
Preferably, the second switch element of described trigger-type control circuit is triode, described 3rd switch element is also triode, and the base stage of described second switch element connects the collector electrode of described 3rd switch element, and the collector electrode of described second switch element connects the base stage of described 3rd switch element.
Preferably, between the emitter of described second switch element and base stage, connect filter circuit, between the emitter of described 3rd switch element and base stage, connect filter circuit.
Preferably, described first switch element is triode, the base stage of described first switch element connects the emitter of described second switch element and the collector electrode of described 3rd switch element, and the emitter of described first switch element connects the base stage of described second switch element and the collector electrode of described 3rd switch element.
Preferably, a voltage-stabiliser tube is connected between the emitter of described first switch element and the base stage of second switch element.
Preferably, filter circuit is connected between the emitter of described first switch element and described voltage-stabiliser tube.
Preferably, described constant-current drive circuit also comprises DC transfer circuit, described DC transfer circuit connects described first switch element, and described first switch element controls the duty ratio of described DC transfer circuit, and described trigger-type control circuit shortens the turn-off time of described first switch element.
Preferably, described DC transfer circuit is reduction voltage circuit, and described first switch element is triode, and described reduction voltage circuit comprises the input of the collector electrode of connection first switch element and connects the output of LED load.
Preferably, described auto-excitation type transducer also comprises voltage-stabiliser tube, and described voltage-stabiliser tube one end connects described first switch element, other end ground connection.
Preferably, described DC transfer circuit is reduction voltage circuit, and described first switch element is field-effect transistor.
Compared to prior art, constant current driver circuit for LED of the present invention has following advantage: the shutoff utilizing trigger-type control circuit control switch element, can shutdown switch element fast.
[accompanying drawing explanation]
Fig. 1 is the common topological diagram of RCC constant-current drive circuit in prior art.
Fig. 2 is the structural representation of constant current driver circuit for LED of the present invention.
Fig. 3 is the circuit diagram of the first preferred embodiment of constant current driver circuit for LED of the present invention.
Fig. 4 is the circuit diagram of another preferred embodiment of constant current driver circuit for LED of the present invention.
[embodiment]
Please refer to shown in Fig. 2 and Fig. 3, constant current driver circuit for LED 1 of the present invention, for LED load provides constant current to drive, comprise the auto-excitation type transducer 2 controlling constant current driver circuit for LED 1 duty ratio.The trigger-type control circuit 21 that auto-excitation type transducer 2 comprises the first switch element Q1 and is connected with the first switch element Q1.Trigger-type control circuit 21 absorbs the electric current of the first switch element Q1, thus shortens the turn-off time of the first switch element Q1.Trigger-type control circuit 21 comprises the second switch element Q2 and the 3rd switch element Q3 that trigger mutually.The second switch element Q2 of trigger-type control circuit 21 is triode, 3rd switch element Q3 is also triode, the base stage of second switch element Q2 connects the collector electrode of the 3rd switch element Q3, and the collector electrode of second switch element Q2 connects the base stage of the 3rd switch element Q3.In the present embodiment, second switch element Q2 is NPN type triode, and the 3rd switch element Q3 is PNP type triode.
Auto-excitation type transducer 2 also comprises the filter circuit 23 connected between the emitter of filter circuit the 22, three switch element Q3 connected between the emitter of second switch element Q2 and base stage and base stage, the diode D3 connecting trigger-type control circuit 21 two ends and connects the winding T1-B at trigger-type control circuit 21 two ends.Diode D3 is when the first switch element Q1 disconnects for winding T1-B provides continuous current circuit, and auto-excitation type transducer 2 also comprises resistance R3, R4 and electric capacity C1.Diode D3, resistance R3, R4 and electric capacity C1 form loop.Filter circuit 22 comprises the resistance R7 and electric capacity C3 that are connected in parallel.The filter circuit 22 that resistance R7 and electric capacity C3 forms, one end connects the base stage of second switch element Q2 and the collector electrode of the 3rd switch element Q3, other end ground connection.Filter circuit 23 comprises the resistance R5 and electric capacity C4 that are connected in parallel, one end of filter circuit 23 that wherein electric capacity R5 forms with electric capacity C4 is connected the emitter of the 3rd switch element Q3, and the other end connects the collector electrode of second switch element Q2 and the base stage of the 3rd switch element Q3.A voltage-stabiliser tube D2 is connected between the emitter of the first switch element Q1 and the base stage of second switch element Q2.Filter circuit 24 is connected between the emitter of the first switch element Q1 and voltage-stabiliser tube D2.Filter circuit 24 comprises the resistance R2 of connection first switch element Q1 emitter, and between one end contact resistance R2 and voltage-stabiliser tube D2, the electric capacity C2 of other end ground connection.In the present embodiment, filter circuit 22,23,24 is RC filter circuit.
The emitter of the first switch element Q1 connects sampling resistor R6, the other end ground connection of sampling resistor R6.
Constant current driver circuit for LED 1 also comprises DC transfer circuit 3, and DC transfer circuit 3 connects the first switch element Q1.In the present embodiment, DC transfer circuit 3 is reduction voltage circuit, and the input of DC transfer circuit 3 connects the collector electrode of the first switch element Q1, and output connects load 4.
The present invention utilizes the auto-excitation type transducer 2 with trigger-type control circuit 21 to control the duty ratio of DC transfer circuit 3, after sampling resistor R6 current sample magnitude of voltage reaches threshold value, through resistance R2, electric capacity C2 attracts, and promotes second switch element (NPN triode) Q2 conducting after level and smooth elimination spike by voltage-stabiliser tube D2.Make the 3rd switch element (PNP triode) Q3 conducting after second switch element Q2 conducting, the conducting of the 3rd switch element Q3 provides again second switch element Q2 base stage a forward bias, second switch element Q2 constant conduction.Second switch element Q2, the 3rd switch element Q3 form trigger-type control circuit, continue the base current of attraction first switch element Q1 until the reversion of winding T1-B polarity of voltage.In whole turn off process, the voltage of sampling resistor R6 reduces the shutoff no longer affecting the first switch element Q1.Electric capacity C4, C3 are used for the spike of filtering switching moments to prevent breaking circuit misoperation.Resistance R5, R7 provide stable initial potential for second switch element Q2 and the 3rd switch element Q3 base stage.In other embodiments, the first switch element also can be other switch elements.Such as, please refer to shown in Fig. 4, the first switch element Q4 also can be metal-oxide-semiconductor, and auto-excitation type transducer 2 also comprises voltage-stabiliser tube D6, and voltage-stabiliser tube D6 one end connects the first switch element Q4, other end ground connection.
Trigger-type control circuit 21 is applied to the constant current driver circuit for LED 1 with auto-excitation type transducer 2 by the present invention, makes the shutoff of the first switch element Q1 of auto-excitation type transducer 2 can not be subject to the impact of the voltage of sampling resistor R6.When after second switch element Q2 conducting, namely the second switch element Q2 of trigger-type control circuit 21 and the 3rd switch element Q3 can be formed from triggering, and keeps conducting.Second switch element Q2 can not turn off because the voltage of sampling resistor R6 reduces, and absorbs the electric current flowing through the first switch element Q1 after affecting second switch element Q2 conducting.Therefore, there is the constant current driver circuit for LED 1 of trigger-type control circuit 21, can not by the impact of sampling resistor R6 voltage, after the electric current of the first switch element Q1 reaches peak value, the electric current of quick absorption first switch element Q1 thus continue shutoff first switch element Q1, makes the constant current accuracy of constant current driver circuit for LED 1 higher.
Claims (10)
1. a constant current driver circuit for LED, for LED load provides constant current to drive, comprise the auto-excitation type transducer controlling described constant-current drive circuit duty ratio, the trigger-type control circuit that described auto-excitation type transducer comprises the first switch element and is connected with described first switch element, described trigger-type control circuit absorbs the electric current of described first switch element to shorten the turn-off time of described first switch element, and described trigger-type control circuit comprises the second switch element, the 3rd switch element that trigger mutually.
2. constant current driver circuit for LED as claimed in claim 1, it is characterized in that: the second switch element of described trigger-type control circuit is triode, described 3rd switch element is also triode, the base stage of described second switch element connects the collector electrode of described 3rd switch element, and the collector electrode of described second switch element connects the base stage of described 3rd switch element.
3. constant current driver circuit for LED as claimed in claim 2, is characterized in that: connect filter circuit between the emitter of described second switch element and base stage, connects filter circuit between the emitter of described 3rd switch element and base stage.
4. constant current driver circuit for LED as claimed in claim 2, it is characterized in that: described first switch element is triode, the base stage of described first switch element connects the emitter of described second switch element and the collector electrode of described 3rd switch element, and the emitter of described first switch element connects the base stage of described second switch element and the collector electrode of described 3rd switch element.
5. constant current driver circuit for LED as claimed in claim 4, is characterized in that: connect a voltage-stabiliser tube between the emitter of described first switch element and the base stage of second switch element.
6. constant current driver circuit for LED as claimed in claim 4, is characterized in that: connect filter circuit between the emitter of described first switch element and described voltage-stabiliser tube.
7. constant current driver circuit for LED as claimed in claim 1, it is characterized in that: described constant-current drive circuit also comprises DC transfer circuit, described DC transfer circuit connects described first switch element, described first switch element controls the duty ratio of described DC transfer circuit, and described trigger-type control circuit shortens the turn-off time of described first switch element.
8. constant current driver circuit for LED as claimed in claim 7, it is characterized in that: described DC transfer circuit is reduction voltage circuit, described first switch element is triode, and described reduction voltage circuit comprises the input of the collector electrode of connection first switch element and connects the output of LED load.
9. constant current driver circuit for LED as claimed in claim 7, is characterized in that: described auto-excitation type transducer also comprises voltage-stabiliser tube, and described voltage-stabiliser tube one end connects described first switch element, other end ground connection.
10. constant current driver circuit for LED as claimed in claim 9, it is characterized in that: described DC transfer circuit is reduction voltage circuit, described first switch element is field-effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310460367.7A CN104254173A (en) | 2013-06-28 | 2013-09-29 | LED (light emitting diode) constant-current drive circuit |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320379848.0 | 2013-06-28 | ||
| CN201320379848 | 2013-06-28 | ||
| CN201310460367.7A CN104254173A (en) | 2013-06-28 | 2013-09-29 | LED (light emitting diode) constant-current drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104254173A true CN104254173A (en) | 2014-12-31 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320608902.4U Expired - Fee Related CN203554739U (en) | 2013-06-28 | 2013-09-29 | LED constant current drive circuit |
| CN201310460367.7A Pending CN104254173A (en) | 2013-06-28 | 2013-09-29 | LED (light emitting diode) constant-current drive circuit |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320608902.4U Expired - Fee Related CN203554739U (en) | 2013-06-28 | 2013-09-29 | LED constant current drive circuit |
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| CN (2) | CN203554739U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104754797A (en) * | 2013-12-26 | 2015-07-01 | 欧普照明股份有限公司 | Light emitting diode (LED) constant current drive circuit |
| CN106507551A (en) * | 2015-09-03 | 2017-03-15 | 欧普照明股份有限公司 | A kind of LED self-excited drivings device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203554739U (en) * | 2013-06-28 | 2014-04-16 | 欧普照明股份有限公司 | LED constant current drive circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101346022A (en) * | 2007-07-09 | 2009-01-14 | 黄怡仁 | Driving circuit of LED lamp |
| US20090212721A1 (en) * | 2008-02-21 | 2009-08-27 | Yasuhiro Maruyama | Led drive circuit |
| CN102695336A (en) * | 2012-05-22 | 2012-09-26 | 曹勇 | LED (light-emitting diode) lamp |
| CN203554739U (en) * | 2013-06-28 | 2014-04-16 | 欧普照明股份有限公司 | LED constant current drive circuit |
-
2013
- 2013-09-29 CN CN201320608902.4U patent/CN203554739U/en not_active Expired - Fee Related
- 2013-09-29 CN CN201310460367.7A patent/CN104254173A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101346022A (en) * | 2007-07-09 | 2009-01-14 | 黄怡仁 | Driving circuit of LED lamp |
| US20090212721A1 (en) * | 2008-02-21 | 2009-08-27 | Yasuhiro Maruyama | Led drive circuit |
| CN102695336A (en) * | 2012-05-22 | 2012-09-26 | 曹勇 | LED (light-emitting diode) lamp |
| CN203554739U (en) * | 2013-06-28 | 2014-04-16 | 欧普照明股份有限公司 | LED constant current drive circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104754797A (en) * | 2013-12-26 | 2015-07-01 | 欧普照明股份有限公司 | Light emitting diode (LED) constant current drive circuit |
| CN104754797B (en) * | 2013-12-26 | 2017-05-31 | 欧普照明股份有限公司 | A kind of constant current driver circuit for LED |
| CN106507551A (en) * | 2015-09-03 | 2017-03-15 | 欧普照明股份有限公司 | A kind of LED self-excited drivings device |
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| Publication number | Publication date |
|---|---|
| CN203554739U (en) | 2014-04-16 |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20141231 |
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| RJ01 | Rejection of invention patent application after publication |