CN104754799B - A kind of LED constant-current driver - Google Patents
A kind of LED constant-current driver Download PDFInfo
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- CN104754799B CN104754799B CN201310740160.5A CN201310740160A CN104754799B CN 104754799 B CN104754799 B CN 104754799B CN 201310740160 A CN201310740160 A CN 201310740160A CN 104754799 B CN104754799 B CN 104754799B
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- constant
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Classifications
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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]
- H05B45/30—Driver circuits
- H05B45/395—Linear regulators
-
- 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]
Abstract
The invention discloses a kind of LED constant-current drivers, constant current driving is provided for LED load, including power factor correction unit, constant pressure control unit and constant-current control unit, the first end of the constant-current control unit connects the negative terminal of the LED load, one end of the constant pressure control unit is connected between the constant-current control unit and the negative terminal of the LED load, the LED load electric current is flowed through in the constant-current control unit control, and the constant pressure control unit controls the voltage of the first end of the constant-current control unit.
Description
【Technical field】
The present invention relates to a kind of constant-flow driver, a kind of especially constant-current drive circuit of lighting device.
【Background technology】
LED has the features such as long lifespan, light efficiency is high, low-power.Frequently with monopole power factor tune in LED drive power
It is whole（PFC）Circuit drives LED, and such circuit is simple, at low cost.Existing monopole pfc circuit generally use two ways.
The first is direct output constant current, and the ripple of this mode output current is big, it is necessary to which the electrolytic capacitor of large capacity filters, so as to lead
Send a telegraph the volume on road and cost increase.Second, a kind of hair is disclosed as Chinese patent application discloses No. CN102843808A
Optical diode constant-flow driver, the driver include single- stage PFC circuit, adjustment pipe and control unit.Single- stage PFC circuit
Input terminal is connected with power supply, and light emitting diode is serially connected between the first output terminal and second output terminal and adjustment is managed, the anode of LED
It is connected with the first output terminal, cathode is connected with adjusting the first end of pipe, and adjust the second end of pipe with single- stage PFC circuit second is defeated
Outlet is connected, and control terminal is connected with control unit.The control unit can control the electric current flowed through in adjustment pipe to reach stable, change
Become the load characteristic of single- stage PFC circuit connection, reduce the load current ripple of single- stage PFC circuit, so as to reduce single- stage PFC
The output signal of circuit feeds back to the error of the input terminal of current closed-loop control circuit, also reduces in single- stage PFC control circuit
The error of the reference signal of current control circuit input terminal finally improves the power factor of single- stage PFC circuit.However this
In LED load voltage change, the loss of adjustment pipe and control unit can increase kind constant-flow driver so that constant-flow driver
Efficiency reduces.
Therefore, in order to overcome drawbacks described above, it is necessary to provide a kind of improved LED constant-current driver.
【The content of the invention】
It is an object of the invention to provide a kind of LED constant-current drivers.
To achieve these goals, the present invention adopts the following technical scheme that：A kind of LED constant-current driver, carries for LED load
It is driven for constant current, including power factor correction unit, constant pressure control unit and constant-current control unit, the constant-current control unit
First end connect the negative terminal of the LED load, one end of the constant pressure control unit be connected to the constant-current control unit with
Between the negative terminal of the LED load, the LED load electric current, the Isobarically Control list are flowed through in the constant-current control unit control
Member controls the voltage of the first end of the constant-current control unit.
Preferably, the constant-current control unit includes the control circuit of switch element and switch element, the control electricity
The electric current that the switch element is flowed through in road control is constant.
Preferably, the switch element of the constant-current control unit is triode, and the control circuit connects the triode
Base stage, the control circuit provides burning voltage and the triode linearly turned on.
Preferably, the constant pressure control unit includes sample circuit, and the first end of the sample circuit connects three pole
The collector of pipe, the constant pressure control unit control the voltage of the transistor collector.
Preferably, the constant-current control unit further includes an at least sampling resistor, the first end connection of the sampling resistor
The emitter of the triode, second end ground connection.
Preferably, the control circuit of the constant-current control unit includes voltage-stabiliser tube and current-limiting circuit, the voltage-stabiliser tube the
One end connects the base stage of the triode, and second end connects the second end of the sampling resistor, the first end of the current-limiting circuit
The base stage of the triode and the first end of the voltage-stabiliser tube are connected, the second end accesses a voltage.
Preferably, the control circuit of the constant-current control unit includes operational amplifier and current-limiting circuit, the constant pressure
Control unit and constant-current control unit share an operational amplifier.
Preferably, the operational amplifier includes connecting the first output terminal of the constant pressure control unit first end, connection
The first input end cathode of the constant pressure control unit second end and the first input end anode for connecting one first reference voltage,
So as to control the power factor correction unit to the constant pressure control unit feedback signal.
Preferably, the operational amplifier further includes the voltage source input terminal of one steady voltage source of connection, connection one second
Second input anode of reference voltage, the second input cathode of the sampling resistor of the connection constant-current control unit and company
The second output terminal of the current-limiting circuit of the constant-current control unit is connect, the first end of the current-limiting circuit connects the operation amplifier
The second output terminal of device, second end connect the base stage of the triode.
Compared to the prior art, LED constant-current driver of the present invention has the advantage that：Constant current is realized using simple circuit
The high efficiency low ripple of LED driver.
【Description of the drawings】
Fig. 1 is the structure diagram of LED constant-current driver of the present invention.
Fig. 2 is the circuit diagram of the first preferred embodiment of LED constant-current driver of the present invention.
Fig. 3 is the circuit diagram of the second preferred embodiment of LED constant-current driver of the present invention.
【Specific embodiment】
Shown in please referring to Fig.1, a kind of LED constant-current driver of the present invention provides constant current driving, including power for LED load
Factor correcting unit, constant pressure control unit and constant-current control unit.The first end connection LED load of constant-current control unit is born
End, between one end connection constant-current control unit of constant pressure control unit and the negative terminal of LED load, constant-current control unit control is flowed through
The electric current of LED load, the voltage of the first end of constant pressure control unit control constant-current control unit.LED constant-current driver of the present invention
Voltage is provided for LED load using power factor correction unit, on the one hand the negative of constant-current control unit connection LED load is provided
End, the electric current constant current of LED load is flowed through with control, and constant-current control unit can effectively inhibit to flow through the current ripples of LED load.
On the other hand, the voltage between constant pressure control unit control constant-current control unit and LED load negative terminal is provided, so that permanent
The voltage of flow control unit will not change with the variation of LED load voltage, so that the power consumption one of constant-current control unit
It is fixed, improve the efficiency of LED constant-current driver.LED constant-current driver of the present invention utilizes simple circuit, for power factor tune
Whole circuit realizes efficient low ripple.
It is LED load for the LED constant-current driver 1 of the first preferred embodiment of the invention specifically, shown in please referring to Fig.2
Constant current driving is provided.LED constant-current driver 1 includes power factor correction unit 10, constant pressure control unit 11 and current constant control
Unit 12.The negative terminal of the first end connection LED load of constant-current control unit 12, one end connection constant current control of constant pressure control unit 11
Between unit 12 and the negative terminal of LED load processed.LED load electric current, constant pressure control unit 11 are flowed through in the control of constant-current control unit 12
Control the voltage of the first end of constant-current control unit 12.
Constant-current control unit 12 includes the control circuit 120 of switch element Q3 and switch element Q3.Control circuit 120 is controlled
The electric current that system flows through switch element Q3 is constant.
The switch element Q3 of constant-current control unit 12 is Serial regulation pipe.Switch element Q3 is triode in the present embodiment,
In other embodiment, switch element Q3 or metal-oxide-semiconductor or other kinds of adjustment are managed.120 connecting valve of control circuit member
The base stage of part Q3, control circuit 120 provide burning voltage and switch element Q3 are linearly turned on.
Constant pressure control unit 11 includes sample circuit 110, the current collection of the first end connecting valve element Q3 of sample circuit 110
Pole, constant pressure control unit 12 control the voltage of switch element Q3 collectors.
Constant-current control unit 12 further includes an at least sampling resistor R30.The first end connecting valve element of sampling resistor R30
The emitter of Q3, second end ground connection.
Control circuit 120 includes voltage-stabiliser tube Z1 and current-limiting circuit 121.Voltage-stabiliser tube Z1 first end connecting valve elements Q3's
Base stage, the second end of second end connection sampling resistor R30, the base stage of the first end connecting valve element Q3 of current-limiting circuit 121 with
And the first end of voltage-stabiliser tube Z1, second end connect a voltage source VCC so as to access a voltage.Current-limiting circuit 121 in the present embodiment
Including resistance R26, in other embodiment, current-limiting circuit 121 can also include multiple resistance or is made of more electronic components.
LED load is made of several LED particles, and resistance R26, voltage-stabiliser tube Z1 and voltage source VCC carry for switch element Q3
For baseline stability voltage Vref.Voltage source VCC is a voltage source stablized, resistance R26 and voltage source VCC provide voltage-stabiliser tube Z1 and
The operating current of switch element Q3.Sampling resistor R30 is current sampling resistor.
In the present embodiment, capacitance C13, resistance R27, R29, capacitance C14 and voltage-stabiliser tube U3 form constant pressure control unit, with
Power factor correction unit 10 is controlled to make the negative terminal voltage of LED load any so as to control the voltage of constant-current control unit 12
In the case of remain unchanged, be Vc.Voltage-stabiliser tube U3 provides a stable Voltage Reference Vr, and resistance R27, R29 are adopting for voltage Vc
Sample resistance.Wherein Vc=（R27/R29+1）* Vr, therefore change resistance R27, R29 can change the setting value of voltage Vc.Switch
Element Q3 base-emitter voltages difference is Vbe.
In system stable state, electric current on sampling resistor R30 for Ir=（Vref-Vbe）/ R30, baseline stability voltage
The base-emitter voltage difference Vbe and sampling resistor R30 of Vref and switch element Q3 is constant parameter, then sampling resistor
The upper electric current Ir of R30 are kept constant.Then flow through the electric current of LED load and the collector current Ic=Ir+Ib, Ib of switch element Q3
For the driving current of switch element Q3, numerical value very little can be neglected, and remain unchanged.Then Ic is remained unchanged, and finally flows through LED load
Driving current Io keep constant it is constant.
On the other hand, constant-voltage control circuit 11 controls the collector voltage Vc of switch element Q3.Vc=（R27/R29+1）*
Vr, according to the change of resistance R27, R29 and voltage-stabiliser tube U3, thus it is possible to vary collector voltage Vc.It can be worked normally meeting circuit
When, very little that collector voltage Vc values can be set, then loss P=Vc of constant-current control unit 12 × Io very littles, are steady state value,
It is and unrelated with LED load voltage change.
Above as can be seen that by the way that switch element Q3 is controlled to work in linear working state so that constant-current control unit 12
It can be good at the working frequency ripple wave that the electric current of LED load is flowed through in control, on the other hand sampling LED by constant pressure control unit 11 bears
The end i.e. voltage of constant-current control circuit 12 is loaded with, effectively controls the loss of constant-current control circuit 12, the effect of entire LED driver
Rate increases.
Specifically, it is LED load for the LED constant-current driver 2 of the second preferred embodiment of the invention shown in please referring to Fig.3
Constant current driving is provided.LED constant-current driver 2 includes power factor correction unit 20, constant pressure control unit 21 and current constant control
Unit 22.The negative terminal of the first end connection LED load of constant-current control unit 22, one end connection constant current control of constant pressure control unit 21
Between unit 22 and the negative terminal of LED load processed.LED load electric current, constant pressure control unit 21 are flowed through in the control of constant-current control unit 22
Control the voltage of the first end of constant-current control unit 22.
Constant-current control unit 22 includes the control circuit 220 of switch element Q3 and switch element Q3.Control circuit 220 is controlled
The electric current that system flows through switch element Q3 is constant.
The switch element Q3 of constant-current control unit 22 is Serial regulation pipe.Switch element Q3 is triode in the present embodiment,
In other embodiment, switch element Q3 or metal-oxide-semiconductor or other kinds of adjustment are managed.220 connecting valve of control circuit member
The base stage of part Q3, control circuit 220 provide burning voltage and switch element Q3 are linearly turned on.
Constant pressure control unit 21 includes sample circuit 210, the current collection of the first end connecting valve element Q3 of sample circuit 210
Pole, constant pressure control unit 22 control the voltage of switch element Q3 collectors.
Constant-current control unit 22 further includes an at least sampling resistor R30.The first end connecting valve element of sampling resistor R30
The emitter of Q3, second end ground connection.
The control circuit 220 of constant-current control unit 22 includes operational amplifier U4 and current-limiting circuit 221.Isobarically Control list
21 and 22 shared operational amplifier U4 of constant-current control unit of member.In the present embodiment, current-limiting circuit 221 includes resistance R24, other realities
It applies in example, current-limiting circuit 221 can also include multiple resistance or other current limiting elements.
Operational amplifier U4 includes the first output terminal OUT1 of connection 21 first end of constant pressure control unit（Pin 1）, connection
The first input end cathode IN1- of 21 second end of constant pressure control unit（Pin 2）And the first of the first reference voltage REF of connection
Input anode IN1+（Pin 3）, so as to control power factor correction unit 20 to 21 feedback signal of constant pressure control unit.
Operational amplifier U4 further includes the voltage source input terminal VCC of one steady voltage source VCC of connection（Pin 8）, connection one
The second input anode IN2+ of second reference voltage REF2（Pin 5）, connection constant-current control unit 22 sampling resistor R30
Second input cathode IN2-（Pin 6）And the second output terminal OUT2 of the current-limiting circuit 221 of connection constant-current control unit 22
（Pin 7）.The second output terminal OUT2 of the first end concatenation operation amplifier U4 of current-limiting circuit 221, second end connecting triode
The base stage of Q3.In the present embodiment, constant-current control circuit 22 further includes filter circuit 222, filter circuit 222 include capacitance C23 and
Resistance R28.Filter circuit 222 is connected between the pin 6 of operational amplifier U4 and sampling resistor R30.Operational amplifier U4's
Pin 4 is grounded.
In the present embodiment, operational amplifier U4 control switch element Q3 conductings, the first reference voltage REF is additional stabilization
Voltage reference source.Steady voltage source VCC powers to operational amplifier U4, and passes through current-limiting circuit 221 and provided to switch element Q3
Driving current.Electric current Ir on sampling resistor R30 flows through sampling resistor R30, and generates voltage signal Vr.Voltage signal Vr and fortune
Calculate the second reference voltage REF2 comparison operations of amplifier U4, generate drive signal so as to control switch element Q3, make Vr=
REF2, so that electric current Ir=REF2/R30 on sampling resistor R30, is steady state value.
The PI that constant pressure control unit 21 includes capacitance C22, C14, R36 composition adjusts circuit, further includes resistance R21, R31.
Capacitance C14 and operational amplifier U4 forms CV control units, controls power factor correction unit 20, makes the lower end electricity of LED load
It is pressed in and remains unchanged in any case, be voltage Vc.Resistance R21, R31 be voltage Vc sampling resistor, the first reference voltage REF
For the voltage reference source of additional stabilization.Thus voltage Vc=（R21/R31+1）* REF, wherein changing resistance R21, R31 can change
The setting value of voltage Vc.
In system stable state, electric current on sampling resistor R30 is Ir=REF2/R30, the second reference voltage REF2 and
Sampling resistor R30 is constant parameter, thus electric current Ir is kept constant on sampling resistor R30.The electric current of LED load and switch member
Collector current Ic=Ir+Ib of part Q3,（Wherein Ib is switch element Q3 ideal base drive currents, and numerical value very little can be neglected, and is protected
It holds constant）.Then Ic is remained unchanged, and driving current Io=REF2/R30 of final LED load keeps constant constant.It can see above
Go out, constant-current control circuit 22 effectively inhibits to flow through the ripple of the electric current of LED load.
On the other hand, control the collector voltage Vc of switch element Q3=（R21/R31+1）* REF, according to resistance R21,
The change of R31, the first reference voltage REF, can change voltage Vc, and when meeting circuit and can work normally, voltage Vc values can
Setting value very little.It can be seen that the voltage of LED load negative terminal, constant-current control circuit 22 are controlled by constant-voltage control circuit 21
Loss P=Vc × Io very littles, be steady state value, it is and unrelated with LED load voltage change.
And in the present embodiment, since the second reference voltage REF2 is applied voltage reference source, this can be certainly with reference to source value
By setting, and the direct shadow of precision of driving current Io=REF2/R30 of LED load, the second reference voltage REF2 and resistance R30
Ring the current precision of LED.Therefore one high-precision second reference voltage REF2 is provided, then can easily ensure that LED is born
The electric current high-precision of load.
It should be noted that the embodiment of the present invention has preferable implementation, and not the present invention is made any type of
Limitation, any one skilled in the art change or are modified to possibly also with the technology contents of the disclosure above equivalent effective
Embodiment, as long as without departing from the content of technical solution of the present invention, what technical spirit according to the invention made above example
Any modification or equivalent variations and modification, in the range of still falling within technical solution of the present invention.
Claims (6)
1. a kind of LED constant-current driver provides constant current driving, including power factor correction unit, Isobarically Control list for LED load
Member and constant-current control unit, the first end of the constant-current control unit connect the negative terminal of the LED load, the Isobarically Control
One end of unit is connected between the negative terminal of the constant-current control unit and the LED load, the constant-current control unit control
The LED load electric current is flowed through, the constant pressure control unit controls the voltage of the first end of the constant-current control unit；The perseverance
Flow control unit includes the control circuit of switch element and switch element, and the switch element is flowed through in the control circuit control
Electric current it is constant；The switch element of the constant-current control unit is triode, and the control circuit connects the base of the triode
Pole, the control circuit provide burning voltage and the triode are linearly turned on；The constant pressure control unit includes sampling electricity
Road, the first end of the sample circuit connect the collector of the triode, and the constant pressure control unit controls the triode
The voltage of collector.
2. LED constant-current driver as described in claim 1, it is characterised in that：The constant-current control unit further includes at least one
Sampling resistor, the first end of the sampling resistor connect the emitter of the triode, second end ground connection.
3. LED constant-current driver as claimed in claim 2, it is characterised in that：The control circuit bag of the constant-current control unit
Voltage-stabiliser tube and current-limiting circuit are included, the voltage-stabiliser tube first end connects the base stage of the triode, and second end connects the sampling
The second end of resistance, the first end of the current-limiting circuit connect the base stage of the triode and the first end of the voltage-stabiliser tube,
Second end accesses a voltage.
4. LED constant-current driver as claimed in claim 2, it is characterised in that：The control circuit bag of the constant-current control unit
Operational amplifier and current-limiting circuit are included, the constant pressure control unit and constant-current control unit share an operational amplifier.
5. LED constant-current driver as claimed in claim 4, it is characterised in that：The operational amplifier includes connecting the perseverance
Press the first output terminal of control unit first end, the first input end cathode of the connection constant pressure control unit second end and company
The first input end anode of one first reference voltage is connect, so as to control the power to the constant pressure control unit feedback signal
Factor correcting unit.
6. LED constant-current driver as claimed in claim 5, it is characterised in that：It is steady that the operational amplifier further includes connection one
The voltage source input terminal in constant voltage source, the second input anode for connecting one second reference voltage, the connection current constant control list
The second output terminal of second input cathode of the sampling resistor of member and the current-limiting circuit of the connection constant-current control unit, institute
The first end for stating current-limiting circuit connects the second output terminal of the operational amplifier, and second end connects the base stage of the triode.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310740160.5A CN104754799B (en) | 2013-12-27 | 2013-12-27 | A kind of LED constant-current driver |
| PCT/CN2014/094878 WO2015096753A1 (en) | 2013-12-27 | 2014-12-25 | Led constant-current driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310740160.5A CN104754799B (en) | 2013-12-27 | 2013-12-27 | A kind of LED constant-current driver |
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| CN104754799A CN104754799A (en) | 2015-07-01 |
| CN104754799B true CN104754799B (en) | 2018-05-25 |
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| CN201310740160.5A Active CN104754799B (en) | 2013-12-27 | 2013-12-27 | A kind of LED constant-current driver |
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| WO (1) | WO2015096753A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108376967A (en) * | 2018-02-23 | 2018-08-07 | 扬州海通电子科技有限公司 | A kind of multiple-channel output low voltage difference overcurrent protector |
| CN110096090A (en) * | 2019-06-10 | 2019-08-06 | 哈尔滨工业大学（深圳） | A kind of constant-current source |
| CN110160678A (en) * | 2019-06-21 | 2019-08-23 | 上海工业自动化仪表研究院有限公司 | Power amplification circuit for magnetoelastic sensor |
| CN112770449B (en) * | 2019-11-05 | 2024-02-02 | 华域视觉科技(上海)有限公司 | Constant-current driving system for automobile signal lamp and driving method thereof |
| CN117374725B (en) * | 2023-12-05 | 2024-03-19 | 成都光创联科技有限公司 | Burst mode laser drive control circuit and method |
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| CN201138880Y (en) * | 2007-12-29 | 2008-10-22 | 连云港杰瑞电子有限公司 | High-performance signal lamp |
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| CN203691700U (en) * | 2013-12-27 | 2014-07-02 | 欧普照明股份有限公司 | LED constant current driver |
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| WO2011065047A1 (en) * | 2009-11-25 | 2011-06-03 | 株式会社村田製作所 | Led drive electric source device and led illumination device |
| CN201869420U (en) * | 2010-12-06 | 2011-06-15 | 上海正龙实业有限公司 | LED (light-emitting diode) driving power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201138880Y (en) * | 2007-12-29 | 2008-10-22 | 连云港杰瑞电子有限公司 | High-performance signal lamp |
| CN102209413A (en) * | 2010-08-16 | 2011-10-05 | 深圳市航嘉驰源电气股份有限公司 | Current feedback circuit and LED (light-emitting diode) lamp drive circuit |
| CN201937898U (en) * | 2010-12-08 | 2011-08-17 | 彩虹集团公司 | Low-power LED lamp electric structure |
| CN202282885U (en) * | 2011-03-30 | 2012-06-20 | 浙江大学宁波理工学院 | LED road lamp driving power supply |
| CN203691700U (en) * | 2013-12-27 | 2014-07-02 | 欧普照明股份有限公司 | LED constant current driver |
Also Published As
| Publication number | Publication date |
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| CN104754799A (en) | 2015-07-01 |
| WO2015096753A1 (en) | 2015-07-02 |
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