CN102083264A - Novel LED (light emitting diode) lighting driving power supply - Google Patents
Novel LED (light emitting diode) lighting driving power supply Download PDFInfo
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- CN102083264A CN102083264A CN201110057163XA CN201110057163A CN102083264A CN 102083264 A CN102083264 A CN 102083264A CN 201110057163X A CN201110057163X A CN 201110057163XA CN 201110057163 A CN201110057163 A CN 201110057163A CN 102083264 A CN102083264 A CN 102083264A
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Abstract
The invention relates to a novel LED (light emitting diode) lighting driving power supply, wherein the input end of the driving power supply is connected with the output end of the driving power supply via a feedback circuit; the feedback circuit comprises a voltage control loop, a current control loop and a PWM (pulse width modulation) regulating circuit; the feedback signals of the voltage control loop and the current control loop are input to the PWM regulating circuit by an optical coupler; the PWM regulating circuit is connected with a transformer circuit so as to control the output voltage; and in the current control loop, a triode is adopted to be matched with a sampling resistor so as to regulate the input duty ratio of the PWM chip, thereby regulating the output current and keeping constant current. The driving power supply combines the triode, a constant voltage source and the optical coupler to control a load end and the PWM controller of the whole circuit so as to output the constant current and constant voltage, thereby driving the LED. The novel LED lighting driving power supply needs few required apparatuses and is high in reliability.
Description
Technical field
The present invention relates to the LED lighting field, specifically be meant a kind of LED illumination driving power.
Background technology
LED uses the advantage that has energy-saving and environmental protection, reliability height, long service life at lighting field, therefore is widely used.At present, domestic LED electric consumption on lighting source plate is relatively poor in the ratio of precision that can accomplish aspect constant voltage, the constant current, constant voltage, constant current effect are not very desirable, and LED is a kind of device of constant current power supply, to the stability requirement of electric current than higher, if the constant current effect is more coarse, can cause reduce greatly the useful life in LED lamp source.
Summary of the invention
The problem that the present invention need solve provides the LED driving power of a kind of constant voltage, constant current, and its output accuracy height, cost are low, effective.
For addressing the above problem, the technical scheme that the present invention takes is: a kind of New LED illumination driving power is provided, comprise the current rectifying and wave filtering circuit that is connected with the input power supply, the transformer circuit that is connected with current rectifying and wave filtering circuit, be connected by feedback circuit between the transformer output driving LED, described transformer circuit input and output, described feedback circuit comprises voltage control loop, current controlled circuit and PWM regulating circuit, it is characterized in that
Described voltage control loop comprises optocoupler U3, resistance R 4, R5, R7 and voltage-reference U202, optocoupler U3 input diode anodal by resistance R 5 connect output voltage V+, optocoupler U3 input diode negative pole is connected to ground by voltage-reference U202; Resistance R 4, R7 be series at output voltage V+and ground between, the two the series connection contact be connected with voltage-reference U202 adjustable side;
Described current controlled circuit comprises triode Q1, current-limiting resistance R6 and current sampling resistor R201, and described current sampling resistor R201 is serially connected with in the transformer circuit output loop, and V-is connected with the output voltage negative pole; Triode Q1 base stage connects output voltage negative pole V-by current-limiting resistance R6, and triode Q1 emitter-base bandgap grading and collector electrode are connected to the current sampling resistor two ends; Triode Q1 collector electrode connects optocoupler U3 input diode positive pole as the output of constant current control loop.
Described PWM regulating circuit comprises integrated chip U1, and its bypass voltage input end and feedback end connect optocoupler U3 induction output, and integrated chip U1 output connects rectification filter circuit output end and transformer negative terminal respectively.
Preferably, be connected to protection capacitor C 7 between described triode Q1 collector electrode and the resistance R 6.
Preferably, connect phase compensation capacitor C 6 between described voltage-reference U202 adjustable side and the optocoupler U3 input diode positive pole.
Preferably, all to adopt precision be ± 1% resistance for described resistance R 4, R7.
The present invention utilizes the characteristic of triode to come control circuit to realize the constant voltage of power supply, the constant current purpose.
Compared with prior art, beneficial effect of the present invention is:
(1) have the very cost performance of advantage, with general constant voltage, constant-current power supply circuit is compared, and can reduce the cost about 20%, has good promotional value;
(2) only adopt triode and constant pressure source, optocoupler to realize constant current, constant voltage in conjunction with the PWM controller of control load end and entire circuit, device is few, the reliability height;
(3) triode has good switching characteristic, is reliable soft switch technique, can effectively improve the reliability of switch, guarantees the circuit steady operation;
(4) described driving power constant current, constant voltage precision have higher accuracy value, can reach more than 5%.
Description of drawings
Fig. 1 is an embodiment of the invention circuit theory schematic diagram.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
As Fig. 1, disclosed LED illumination driving power, comprise the current rectifying and wave filtering circuit that is connected with the input power supply, the transformer circuit that is connected with current rectifying and wave filtering circuit, transformer output driving LED, be connected by feedback circuit between described transformer circuit input and the output, described feedback circuit comprises voltage control loop, current controlled circuit and PWM regulating circuit.The feedback signal of voltage control loop, current controlled circuit all is input to the PWM regulating circuit by optocoupler U3, and the PWM regulating circuit connects transformer circuit, realizes output voltage control.
Wherein, the output of transformer T1 winding also is provided with halfwave rectifier diode D2, capacitor C 5, C9 and forms filter network in the transformer circuit, and after regulating, capacitor C 5 two ends obtain stable DC voltage; The capacity of capacitor C 9 is less, and it act as the high-frequency ac ripple voltage that reduces to superpose in the output voltage; Finally press and be used for the driving LED illuminating lamp at the galvanic current of output output constant voltage, constant current.
Wherein, the PWM regulating circuit comprises integrated chip U1, and its bypass voltage input end and feedback end connect optocoupler U3 induction output, and integrated chip U1 output connects rectification filter circuit output end and transformer negative terminal respectively.
Wherein, the voltage control loop comprises optocoupler U3, resistance R 4, R5, R7 and voltage-reference U202, resistance R 5 is connected with optocoupler U3 input diode is anodal, resistance R 5 another termination output voltage anode V+, optocoupler U3 input diode negative pole is by voltage-reference U202, and the voltage-reference U202 other end is connected to ground.Resistance R 4, R7 be series at output voltage V+and ground between, the two series connection contact connects voltage-reference U202 adjustable side.Also be connected to capacitor C 6 between voltage-reference U202 adjustable side and the optocoupler U3 input diode positive pole.Transformer output end voltage V+ is the voltage drop of optocoupler U3 and the voltage drop sum on the voltage-reference U202; Resistance R 5 has been set the basic bias current of integrated chip U1; Capacitor C 6 is used for the phase compensation between voltage-reference U202 internal amplifier inverting input and output.
The voltage ratio that changes resistance R 4, R7 can change output voltage V+value, the concrete computing formula of output voltage is V+=R7/ (R7+R4) * 2.5.Will reach high output voltage precision among the present invention, R4, R7 precision are high more good more, the resistance of minimum selecting for use ± 1% precision.
Wherein, current controlled circuit comprises triode Q1, current-limiting resistance R6 and current sampling resistor R201, and described current sampling resistor R201 is serially connected with in the transformer circuit output loop, and V-is connected with the output voltage negative pole; Triode Q1 base stage connects output voltage negative pole V-by current-limiting resistance R6, and triode Q1 emitter and collector electrode are connected to current sampling resistor R201 two ends.Triode Q1 collector electrode connects optocoupler U3 input diode positive pole, and is connected to protection capacitor C 7 between this collector electrode and the resistance R 6.
Voltage on current sampling resistor R201 is reduced to UR201=R201Iout.If output current increases, then the voltage drop on the resistance R 201 also increases, and voltage U be also increases thereupon between triode Q1 base stage and emitter, causes that the base current of triode Q1 also increases, and triode Q1 enters the amplification region, and output is constant-current characteristics.At this moment, the collector current of triode Q1 increases equally.The collector current input optocoupler U3 input of Q1, the luminous intensity of U3 input diode increases, and causes the conducting degree of U3 primary side phototriode to increase equally, impels integrated chip U1 PWM output duty cycle to reduce, and then output current is reduced, reach the purpose of constant current.Change the value of output continuous current, need by changing the resistance of resistance R 201.For guaranteeing the output end voltage current stabilization, when selecting resistance R 201, its dissipation power needs enough big, if dissipation power is not enough, can cause behind the resistance heating that resistance diminishes, and can cause the skew of constant current point.Capacitor C 7 effect is to prevent at the output band during than large capacitive load, and circuit unexpected moment starts and makes circuit generation misoperation.Resistance R 6 is the current-limiting resistance of triode Q1 base stage still not, can play the effect of local modulation Constant Electric Current flow valuve simultaneously.
Be 12V when setting output voltage, when electric current is 500mA, driving power output voltage of the present invention, the electric current linearity and precision measure value list are as follows:
As seen described driving power output current precision reaches 5%, has good constant current, the constant voltage precision, well satisfied of the requirement of LED lamp to constant current accuracy, thereby improve the useful life of LED lamp, effectively reduce cost, reduce power loss, efficient reaches more than 85%, and expection met or exceeded 50000 hours LED useful life.
With respect to the product of same kind of the same trade, described driving power circuit design simplification has effectively reduced production cost, has saved the pcb board space, makes things convenient for the design of LED product circuit, also effectively raises reliability of products.
The preferred version that the foregoing description is realized for the present invention; and indefiniteness is exhaustive, and the present invention can also have other variations under same idea, need to prove; without departing from the inventive concept of the premise, any conspicuous replacement is all within protection range of the present invention.
Claims (5)
1. New LED illumination driving power, comprise the current rectifying and wave filtering circuit that is connected with the input power supply, the transformer circuit that is connected with current rectifying and wave filtering circuit, transformer output driving LED, be connected by feedback circuit between described transformer circuit input and the output, described feedback circuit comprises voltage control loop, current controlled circuit and PWM regulating circuit, it is characterized in that
Described voltage control loop comprises optocoupler U3, resistance R 4, R5, R7 and voltage-reference U202, optocoupler U3 input diode anodal by resistance R 5 connect output voltage V+, optocoupler U3 input diode negative pole is connected to ground by voltage-reference U202; Resistance R 4, R7 be series at output voltage V+and ground between, the two the series connection contact be connected with voltage-reference U202 adjustable side;
Described current controlled circuit comprises triode Q1, current-limiting resistance R6 and current sampling resistor R201, and described current sampling resistor R201 is serially connected with in the transformer circuit output loop, and V-is connected with the output voltage negative pole; Triode Q1 base stage connects output voltage negative pole V-by current-limiting resistance R6, and triode Q1 emitter-base bandgap grading and collector electrode are connected to the current sampling resistor two ends; Triode Q1 collector electrode connects optocoupler U3 input diode positive pole as the output of constant current control loop.
2. New LED illumination driving power according to claim 1, it is characterized in that, described PWM regulating circuit comprises integrated chip U1, its bypass voltage input end and feedback end connect optocoupler U3 induction output, and integrated chip U1 output connects rectification filter circuit output end and transformer negative terminal respectively.
3. New LED illumination driving power according to claim 1 and 2 is characterized in that, is connected to protection capacitor C 7 between described triode Q1 collector electrode and the resistance R 6.
4. New LED illumination driving power according to claim 1 and 2 is characterized in that, connects phase compensation capacitor C 6 between described voltage-reference U202 adjustable side and the optocoupler U3 input diode positive pole.
5. New LED according to claim 1 and 2 illumination driving power is characterized in that, it is ± 1% resistance that described resistance R 4, R7 all adopt precision.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110057163XA CN102083264A (en) | 2011-03-10 | 2011-03-10 | Novel LED (light emitting diode) lighting driving power supply |
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| CN201110057163XA CN102083264A (en) | 2011-03-10 | 2011-03-10 | Novel LED (light emitting diode) lighting driving power supply |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103108433A (en) * | 2011-11-14 | 2013-05-15 | 台达电子企业管理（上海）有限公司 | Voltage adjusting circuit and light emitting diode (LED) drive device thereof |
| CN103687238A (en) * | 2013-12-13 | 2014-03-26 | 卫星电子（中山）有限公司 | Novel LED two-line dimming control circuit |
| CN104125686A (en) * | 2014-06-24 | 2014-10-29 | 深圳市九洲光电科技有限公司 | Safe-isolated and full-color LED lamp circuit and dimming method |
| CN112233625A (en) * | 2020-10-16 | 2021-01-15 | Tcl华星光电技术有限公司 | Backlight constant-current control circuit and backlight structure |
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| US7649327B2 (en) * | 2006-05-22 | 2010-01-19 | Permlight Products, Inc. | System and method for selectively dimming an LED |
| CN201414244Y (en) * | 2009-06-10 | 2010-02-24 | 福建蓝蓝高科技发展有限公司 | Driving circuit for high-power LED street lamps |
| CN202005030U (en) * | 2011-03-10 | 2011-10-05 | 广东九联科技股份有限公司 | Novel light-emitting diode (LED) lighting driving power supply |
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2011
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Patent Citations (4)
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| US7649327B2 (en) * | 2006-05-22 | 2010-01-19 | Permlight Products, Inc. | System and method for selectively dimming an LED |
| CN101227779A (en) * | 2008-01-29 | 2008-07-23 | 电子科技大学 | Insulation type general use illumination LED driving circuit |
| CN201414244Y (en) * | 2009-06-10 | 2010-02-24 | 福建蓝蓝高科技发展有限公司 | Driving circuit for high-power LED street lamps |
| CN202005030U (en) * | 2011-03-10 | 2011-10-05 | 广东九联科技股份有限公司 | Novel light-emitting diode (LED) lighting driving power supply |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103108433A (en) * | 2011-11-14 | 2013-05-15 | 台达电子企业管理（上海）有限公司 | Voltage adjusting circuit and light emitting diode (LED) drive device thereof |
| US8917035B2 (en) | 2011-11-14 | 2014-12-23 | Delta Electronics (Shanghai) Co., Ltd. | Voltage regulation circuit and light emitting didoe driving apparatus having the same |
| CN103108433B (en) * | 2011-11-14 | 2015-11-25 | 台达电子企业管理（上海）有限公司 | A kind of voltage regulator circuit and LED drive device thereof |
| CN103687238A (en) * | 2013-12-13 | 2014-03-26 | 卫星电子（中山）有限公司 | Novel LED two-line dimming control circuit |
| CN103687238B (en) * | 2013-12-13 | 2016-04-20 | 卫星电子（中山）有限公司 | A kind of novel LED two line adjusting control circuit |
| CN104125686A (en) * | 2014-06-24 | 2014-10-29 | 深圳市九洲光电科技有限公司 | Safe-isolated and full-color LED lamp circuit and dimming method |
| CN104125686B (en) * | 2014-06-24 | 2017-02-22 | 深圳市九洲光电科技有限公司 | Safe-isolated and full-color LED lamp circuit and dimming method |
| CN112233625A (en) * | 2020-10-16 | 2021-01-15 | Tcl华星光电技术有限公司 | Backlight constant-current control circuit and backlight structure |
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Application publication date: 20110601 |