CN102573197B - Light-emitting diode (LED) driving output-level circuit and LED driving power supply - Google Patents
Light-emitting diode (LED) driving output-level circuit and LED driving power supply Download PDFInfo
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- CN102573197B CN102573197B CN 201010619618 CN201010619618A CN102573197B CN 102573197 B CN102573197 B CN 102573197B CN 201010619618 CN201010619618 CN 201010619618 CN 201010619618 A CN201010619618 A CN 201010619618A CN 102573197 B CN102573197 B CN 102573197B
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Abstract
The invention is applicable to the field of power supplies, and provides a light-emitting diode (LED) driving output-level circuit and an LED driving power supply. The LED driving output-level circuit comprises a slow start-up circuit which comprises a capacitor C6 and a resistor R18. According to the LED driving output-level circuit of the embodiment of the invention, the slow start-up circuit which comprises the capacitor C6 and the resistor R18 controls a transistor to be conducted quickly at power-on moment, an opto-coupler feeds back current signals to a plastic film capacitor (PFC) control circuit, so that closed-loop feedback is quickly established at the power-on moment, and overshoot current is effectively suppressed.
Description
Technical field
The invention belongs to field of power supplies, relate in particular to a kind of LED driver output level circuit and LED driving power.
Background technology
At present, under the drive of LED illumination, the application that single-stage PFC (Power Factor Correction, power factor correction) drives begins to rise (power factor more than 0.9 being arranged in the situation that do not increase cost and PCB area).Single Stage PFC Converter combines PFC level and DC/DC power conversion stage, has reached the purpose that reduces number of devices, simplified control circuit, raising power density, and tries hard to make whole converter circuit to have higher efficient, output stability preferably.
But because the inherent characteristic of PFC correcting circuit, its closed loop feedback very slow (generally not being higher than 100HZ), the moment that is just powering on, because closed loop feedback is not set up, in fact power supply works in open loop situations, cause powered on moment former limit switching tube and output that very large overshoot current is arranged, all can cause damage to driving power and led light source.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of LED driver output level circuit, be intended to solve the moment that is just powering on, the PFC correcting circuit is in open loop situations, and powered on moment produces very large overshoot current, all can cause the problem of damage to driving power and led light source.
The embodiment of the invention is to realize like this, a kind of LED driver output level circuit, the input that described circuit obtains power supply by a transformer time limit winding T1D, the termination signal ground of described limit winding T1D, the other end of described limit winding T1D connects the electrode input end of led light source by diode D8, the end of described limit winding T1D also connects the negative input of led light source and an end of resistance R 19 by the current sense resistor group, the base stage of the other end connecting triode Q6 of resistance R 19, the emitter of triode Q6 by feedback resistance contact resistance R19 the other end and connect signal ground, the collector electrode of triode Q6 connects the electrode input end of led light source by the photophore of an optocoupler, wherein, the tandem compound circuit that between the collector electrode of triode Q6 and base stage, is connected capacitor C 6 and resistance R 18.Another purpose of the embodiment of the invention is to provide a kind of LED driving power, and described LED driving power comprises: power rectifier input stage circuit, PFC control circuit and LED driver output level circuit;
The output of described power rectifier input stage circuit provides the work electricity by transformer coupled mode to subsequent conditioning circuit, the output of described power rectifier input stage circuit connects the control signal output of PFC control circuit by a primary winding T1A and switching tube Q101, when switching tube Q101 is closed, primary winding T1A passes through electric current, and is coupled to time limit winding T1D;
The input that described LED driver output level circuit obtains power supply by described transformer time limit winding T1D, the termination signal ground of described limit winding T1D, the other end of described limit winding T1D connects the electrode input end of led light source by diode D8, the end of described limit winding T1D also connects the negative input of led light source and an end of resistance R 19 by the current sense resistor group, the base stage of the other end connecting triode Q6 of resistance R 19, the emitter of triode Q6 by feedback resistance contact resistance R19 the other end and connect signal ground, the collector electrode of triode Q6 connects the electrode input end of led light source by the photophore of an optocoupler, wherein, the tandem compound circuit that between the collector electrode of triode Q6 and base stage, is connected capacitor C 6 and resistance R 18; The photophore of described optocoupler connects the feedback signal input of PFC control circuit.
The moment that embodiment of the invention LED driver output level circuit is powering on, by the soft-start circuit control triode fast conducting that is consisted of by capacitor C 6 and resistance R 18, optocoupler feedback current signal is to the PFC control circuit, thereby at the moment Rapid Establishment closed loop feedback that powers on, establishment current over pulse.
Description of drawings
Fig. 1 is the circuit diagram of the LED driving power that provides of the embodiment of the invention;
Fig. 2 is the circuit diagram of the LED driver output level circuit that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
The embodiment of the invention effectively solves the problem that overshoot current appears in the moment that powers on by adopting by an electric capacity and the soft-start circuit that resistance is in series.
As shown in Figure 2, the embodiment of the invention provides a kind of LED driver output level circuit 4, the input that circuit obtains power supply by a transformer time limit winding T1D, the termination signal ground of inferior limit winding T1D, the other end of inferior limit winding T1D connects the electrode input end of led light source by diode D8, the end of inferior limit winding T1D also connects the negative input of led light source and an end of resistance R 19 by the current sense resistor group, the base stage of the other end connecting triode Q6 of resistance R 19, the emitter of triode Q6 by feedback resistance contact resistance R19 the other end and connect signal ground, the collector electrode of triode Q6 connects the electrode input end of led light source by the photophore of an optocoupler, wherein, the tandem compound circuit that between the collector electrode of triode Q6 and base stage, is connected capacitor C 6 and resistance R 18.
In the said structure, the current sense resistor group is formed in parallel by at least two resistance, such as the resistance R 37 among Fig. 2, resistance R 33, resistance R 35, resistance R 34.
In the said structure, the two ends of current sense resistor group connect diode series connection group, such as the diode D13 among Fig. 2 and diode D16, the current sense resistor group links to each other with inferior limit winding T1D one end and holds the negative electrode that is connected diode series connection group, and the continuous end of current sense resistor group and led light source negative input is connected the anode of diode series connection group.
In the said structure, series limiting resistor R36 between the photophore of optocoupler and the led light source electrode input end.
In the said structure, feedback resistance comprises a thermistor, such as the resistance R Z among Fig. 1, can adopt the NTC of 10K.
As shown in Figure 1, the embodiment of the invention also provides a kind of LED driving power, and the LED driving power comprises: power rectifier input stage circuit, PFC control circuit and LED driver output level circuit;
The output of power rectifier input stage circuit provides the work electricity by transformer coupled mode to subsequent conditioning circuit, the output of power rectifier input stage circuit connects the control signal output of PFC control circuit by a primary winding T1A and switching tube Q101, when switching tube Q101 is closed, primary winding T1A passes through electric current, and is coupled to time limit winding T1D;
The input that LED driver output level circuit obtains power supply by described transformer time limit winding T1D, the termination signal ground of inferior limit winding T1D, the other end of inferior limit winding T1D connects the electrode input end of led light source by diode D8, the end of inferior limit winding T1D also connects the negative input of led light source and an end of resistance R 19 by the current sense resistor group, the base stage of the other end connecting triode Q6 of resistance R 19, the emitter of triode Q6 by feedback resistance contact resistance R19 the other end and connect signal ground, the collector electrode of triode Q6 connects the electrode input end of led light source by the photophore of an optocoupler, wherein, the tandem compound circuit that between the collector electrode of triode Q6 and base stage, is connected capacitor C 6 and resistance R 18; The photophore of optocoupler connects the feedback signal input of PFC control circuit.
The present invention is described further below in conjunction with drawings and Examples.
Fig. 1 shows the circuit diagram of the LED driving power that the embodiment of the invention provides.For convenience of explanation, only show the part relevant with the embodiment of the invention.
The LED driving power comprises power rectifier input stage circuit 2, PFC control circuit 3 and LED driver output level circuit 4.
Power rectifier input stage circuit 2 links to each other with the external communication electricity, and PFC control circuit 3 all links to each other with power rectifier input stage circuit 2 and LED driver output level circuit 4, and LED driver output level circuit 4 is used for linking to each other with a led light source.
The LED driver output level circuit 4 that the embodiment of the invention provides comprises capacitor C Y, transformer T1, diode D8, resistance R 36, optocoupler photophore U1A, triode Q6, the soft-start circuit 5 that is consisted of by the series connection of capacitor C 6 and resistance R 18, resistance R 19, resistance R 31, resistance R Z, resistance R 33, resistance R 34, resistance R 35, resistance R 37, resistance R 50, capacitor C 40, capacitor C 7, capacitor C 5, diode D16, diode D13, voltage-stabiliser tube D4, voltage-stabiliser tube ZD3, LED drives anode LED+ and LED drives negative terminal LED-.
Please also refer to Fig. 2, transformer T1 comprises armature winding T1A, inferior limit winding T1D and induction winding T1B, the first termination signal ground of inferior limit winding T1D, and the second end links to each other with the anode of diode D8.The first end of armature winding T1A and the second end link to each other with positive output end and the negative output terminal of a PFC control circuit 3 respectively.
The negative electrode of diode D8 links to each other with the anode of optocoupler photophore U1A by resistance R 36, also drives anode LED+ with LED and links to each other.The negative electrode of optocoupler photophore U1A links to each other with the collector electrode of triode Q6, also links to each other with the base stage of triode Q6 by soft-start circuit 5.The emitter of triode Q6 connects signal ground.LED drives anode LED+ and LED driving negative terminal LED-is respectively applied to link to each other with positive pole and the negative pole of a led light source (not shown).
Resistance R 33, resistance R 34, resistance R 35, the resistance R 37 rear current sense resistor groups that consist of in parallel, an end ground connection, the other end drives negative terminal LED-with LED and links to each other, and links to each other through the base stage of resistance R 19 with triode Q6.
The base stage of triode Q6 also links to each other with the emitter of triode Q6 by resistance R 31 and the resistance R Z of series connection, and the resistance R 31 of series connection and resistance R Z consist of feedback resistance.
Soft-start circuit 5 comprises capacitor C 6 and the resistance R 18 of series connection.The positive pole of capacitor C 6 links to each other with the negative electrode of the photophore U1A of optocoupler U1, and resistance R 18 is connected with the base stage of triode Q6.
Capacitor C 7 and capacitor C 5 all are connected between the first end of the negative electrode of diode D8 and time limit winding T1D.
Also linking to each other with the negative electrode of diode D8 by resistance R 50 and capacitor C 40 successively of diode D8 anode.
The anode of diode D16 drives negative terminal LED-with LED and links to each other, and negative electrode links to each other with the anode of diode D13.The negative electrode of diode D13 connects signal ground.
The anode of voltage-stabiliser tube D4 links to each other with the emitter of triode Q6, and negative electrode links to each other with the anode of voltage-stabiliser tube ZD3.The negative electrode of voltage-stabiliser tube ZD3 links to each other with the negative electrode of optocoupler photophore U1A.
PFC control circuit 3 comprises former limit pfc controller, field effect transistor Q101, optocoupler light-receiving device U1B, resistance R 22, resistance R 5, resistance R 8, resistance R 9, resistance R 15, resistance R 20.Resistance R 10, resistance R 11, resistance R 23 and capacitor C 9.
PFC control circuit 3 is take former limit pfc controller as core, and former limit pfc controller is specially Power Factor Correction Control chip AP1661, and this chip contains 8 pins.Pin one is the error amplifier input, and pin two is the voltage compensation end, and pin 3 is the internal multiplier input, pin 4 is the current sample input, and pin 5 is the zero current detection input, and pin 6 is earth terminal, pin 7 is the control signal output, and pin 8 provides end for the initialization electric current.
Pin one links to each other with the negative electrode of optocoupler light-receiving device U1B by resistance R 9, the negative electrode of optocoupler light-receiving device U1B is by resistance R 15 ground connection, the anode of optocoupler light-receiving device U1B links to each other with the first end of resistance R 20, and the second end of resistance R 20 links to each other with the first end of armature winding T1A as the positive output end of PFC control circuit 3.The second end of resistance R 20 also links to each other with the output of a power rectifier input stage circuit 2, and the input of power rectifier input stage circuit 2 links to each other with the external communication electricity.
Pin two links to each other with pin one by capacitor C 9 and resistance R 8 successively.
Pin 3 links to each other with the output of power rectifier input stage circuit 2 by resistance R 22, and by resistance R 5 ground connection.
Pin 5 links to each other by the first end of resistance R 10 with induction winding T1B, the second end ground connection of induction winding T1B.
Pin 6 ground connection.The emitter of triode Q6 in the LED driver output level circuit 4 also links to each other with pin 6 by capacitor C Y.
Pin 7 links to each other with the grid of field effect transistor Q101 by resistance R 11, and the drain electrode of field effect transistor Q101 links to each other with the second end of armature winding T1A as the negative output terminal of PFC control circuit 3, and the source electrode of field effect transistor Q101 links to each other with pin 4.The break-make of pin 7 output signals control field effect transistor Q101.
Pin 8 connects a direct current power supply VCC.
The moment that powers on, capacitor C 6 is recharged, and soft-start circuit 5 is equivalent to short circuit, this moment triode Q6 fast conducting, optocoupler photophore U1A emits beam.Optocoupler light-receiving device U1B accepts to produce photoelectric current after the light, flow out from output, and feed back to Power Factor Correction Control chip AP1661 in the PFC control circuit 3, with the duty ratio of power-limiting factor correcting control chip AP1661, and then suppress output current overshoot.Capacitor C 6 disconnects after being full of electricity, and soft-start circuit 5 is equivalent to open circuit, and LED driver output level circuit 4 enters normal operating conditions.Resistance R 33, resistance R 34, resistance R 35, resistance R 37 are current sense resistor during 4 normal operation of LED driver output level circuit, current signal is converted into voltage signal and is fed back to Power Factor Correction Control chip AP1661 by triode Q6 and optocoupler photophore U1A and optocoupler light-receiving device U1B, by Power Factor Correction Control chip AP1661 control output current, reach the purpose of capability correction.
The moment that embodiment of the invention LED driver output level circuit is powering on, by the soft-start circuit control triode fast conducting that is consisted of by capacitor C 6 and resistance R 18, optocoupler feedback current signal is to the PFC control circuit, thereby at the moment Rapid Establishment closed loop feedback that powers on, establishment current over pulse.The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. LED driver output level circuit, it is characterized in that, the input that described circuit obtains power supply by a transformer time limit winding T1D, the termination signal ground of described limit winding T1D, the other end of described limit winding T1D connects the electrode input end of led light source by diode D8, the end of described limit winding T1D also connects the negative input of led light source and an end of resistance R 19 by the current sense resistor group, the base stage of the other end connecting triode Q6 of resistance R 19, the emitter of triode Q6 by feedback resistance contact resistance R19 the other end and connect signal ground, the collector electrode of triode Q6 connects the electrode input end of led light source by the photophore of an optocoupler, wherein, be connected the tandem compound circuit of capacitor C 6 and resistance R 18 between the collector electrode of triode Q6 and base stage, the photophore of described optocoupler connects the feedback signal input of PFC control circuit.
2. LED driver output level circuit as claimed in claim 1 is characterized in that, described current sense resistor group is formed in parallel by at least two resistance.
3. LED driver output level circuit as claimed in claim 1, it is characterized in that, the two ends of described current sense resistor group connect diode series connection group, described current sense resistor group links to each other with described limit winding T1D one end and holds the negative electrode that is connected diode series connection group, and the continuous end of described current sense resistor group and led light source negative input is connected the anode of diode series connection group.
4. LED driver output level circuit as claimed in claim 1 is characterized in that, series limiting resistor R36 between the photophore of described optocoupler and the described led light source electrode input end.
5. LED driver output level circuit as claimed in claim 1 is characterized in that, described feedback resistance comprises a thermistor.
6. a LED driving power is characterized in that, described LED driving power comprises: power rectifier input stage circuit, PFC control circuit and LED driver output level circuit;
The output of described power rectifier input stage circuit provides the work electricity by transformer coupled mode to subsequent conditioning circuit, the output of described power rectifier input stage circuit connects the control signal output of PFC control circuit by a primary winding T1A and switching tube Q101, when switching tube Q101 is closed, primary winding T1A passes through electric current, and is coupled to time limit winding T1D;
The input that described LED driver output level circuit obtains power supply by described transformer time limit winding T1D, the termination signal ground of described limit winding T1D, the other end of described limit winding T1D connects the electrode input end of led light source by diode D8, the end of described limit winding T1D also connects the negative input of led light source and an end of resistance R 19 by the current sense resistor group, the base stage of the other end connecting triode Q6 of resistance R 19, the emitter of triode Q6 by feedback resistance contact resistance R19 the other end and connect signal ground, the collector electrode of triode Q6 connects the electrode input end of led light source by the photophore of an optocoupler, wherein, the tandem compound circuit that between the collector electrode of triode Q6 and base stage, is connected capacitor C 6 and resistance R 18; The photophore of described optocoupler connects the feedback signal input of PFC control circuit.
7. LED driving power as claimed in claim 6 is characterized in that, described current sense resistor group is formed in parallel by at least two resistance.
8. LED driving power as claimed in claim 6, it is characterized in that, the two ends of described current sense resistor group connect diode series connection group, described current sense resistor group links to each other with described limit winding T1D one end and holds the negative electrode that is connected diode series connection group, and the continuous end of described current sense resistor group and led light source negative input is connected the anode of diode series connection group.
9. LED driving power as claimed in claim 6 is characterized in that, series limiting resistor R36 between the photophore of described optocoupler and the described led light source electrode input end.
10. LED driving power as claimed in claim 6 is characterized in that, described feedback resistance comprises a thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010619618 CN102573197B (en) | 2010-12-31 | 2010-12-31 | Light-emitting diode (LED) driving output-level circuit and LED driving power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010619618 CN102573197B (en) | 2010-12-31 | 2010-12-31 | Light-emitting diode (LED) driving output-level circuit and LED driving power supply |
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| Publication Number | Publication Date |
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| CN102573197A CN102573197A (en) | 2012-07-11 |
| CN102573197B true CN102573197B (en) | 2013-10-23 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104378882A (en) * | 2014-11-13 | 2015-02-25 | 浙江点金照明有限公司 | Special 60 W driving power circuit for LED |
| CN111736680B (en) * | 2020-05-28 | 2022-04-22 | 广东浪潮大数据研究有限公司 | Control method, control device, control equipment and storage medium for power supply slow start |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1692544A (en) * | 2002-04-18 | 2005-11-02 | 姜涛 | Green switch power supply with standby function and IC thereof |
| CN201674693U (en) * | 2010-04-29 | 2010-12-15 | 韦柳青 | Led driving power supply |
| CN101925225A (en) * | 2010-01-15 | 2010-12-22 | 海洋王照明科技股份有限公司 | A kind of constant current feedback circuit that is applied in the high-power LED drive circuit |
-
2010
- 2010-12-31 CN CN 201010619618 patent/CN102573197B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1692544A (en) * | 2002-04-18 | 2005-11-02 | 姜涛 | Green switch power supply with standby function and IC thereof |
| CN101925225A (en) * | 2010-01-15 | 2010-12-22 | 海洋王照明科技股份有限公司 | A kind of constant current feedback circuit that is applied in the high-power LED drive circuit |
| CN201674693U (en) * | 2010-04-29 | 2010-12-15 | 韦柳青 | Led driving power supply |
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