CN102291887A - High-power light emitting diode (LED) driving circuit - Google Patents
High-power light emitting diode (LED) driving circuit Download PDFInfo
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- CN102291887A CN102291887A CN201110179478A CN201110179478A CN102291887A CN 102291887 A CN102291887 A CN 102291887A CN 201110179478 A CN201110179478 A CN 201110179478A CN 201110179478 A CN201110179478 A CN 201110179478A CN 102291887 A CN102291887 A CN 102291887A
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Abstract
The invention discloses a high-power light emitting diode (LED) driving circuit, which is characterized by comprising a rectification module, a driving module, a voltage transformation module and a light source module, wherein the rectification module is used for rectifying input alternating current; one end of the driving module is connected with the rectification module; and the voltage transformation module and the light source module are connected with the other two ends of the driving module. The high-power LED driving circuit is simple in structure, low in power consumption, low in cost and high in stability and provides stable current. The high-power LED driving circuit is provided with an optocoupler feedback loop; the change of output current is small, namely 0.41 to 0.44A within a wide input voltage range from 150 to 250V and a wide LED load changing range (the output voltage range is from 11.4 to 31.5V when 1-3 LED(s) is/are connected in series), the constant current precision reaches +/-5 percent, and the requirement of an LED for power supply can be completely met.
Description
Technical field
The present invention relates to semiconductor integrated circuit, be specifically related to a kind of high-power LED drive circuit.
Background technology
LED is from being born so far, improves 20 times, price with brightness in per 10 years and is reduced to original 1/100 speed development.Be accompanied by the invention of new material and the raising of light efficiency, the power of single led light source and luminous flux are also increasing sharply.Fast-developing LED technology makes the application of LED in illuminating engineering also more and more widely.For the high-power LED illumination circuit, no matter which kind of power supply all can not directly be powered to LED.Make lighting source as using LED, will solve the problem of power drives.
The temperature coefficient of the PN junction of LED is for negative, and the potential barrier electromotive force of LED reduced when temperature raise.Therefore, LED can not directly use voltage fed, must adopt current limiting measures.Otherwise the rising of temperature when working along with LED, electric current can be increasing, so that damage LED.The ratio that flows through the luminous flux of the electric current of LED and LED simultaneously also is non-linear.The luminous flux of LED increases and increases along with the electric current that flows through LED, but is not directly proportional, and luminous flux increases fewly more more finally.Therefore, LED is worked under than higher current value a luminous efficiency.
Existing led drive circuit selection strategy roughly adheres to three types of constant-current source, charge pump and Switching Power Supplies separately, is divided into tandem type, parallel connection type and string and hybrid type according to the load connected mode.Because of the LED luminous intensity is directly proportional with electric current by diode, have several method can make the luminous intensity of a plurality of LED reach approximate match: a kind of is with every paths of LEDs configuration in parallel with source of stable pressure, another kind is with all diode configured in series, under the individual cases, also can adopt the parallel/series configuration mode of mixing, make by the electric current of each diode all identical.For guaranteeing reliability, the electric current of driving LED must be lower than the requirement of LED rated value, but when ambient temperature raise, the rated current that is allowed can reduce.Usually, when temperature was increased to 85 ℃ by 25 ℃, rated current dropped to 6mA by 30mA.The fault performance of circuit common is: the output current shakiness; The switch vibration is also unstable, and not starting of oscillation or normal failure of oscillation can't be worked.
Summary of the invention
The objective of the invention is the defective that exists in the above-mentioned prior art in order to overcome, a kind of cost is provided at the bottom of, simple in structure, high-power LED drive circuit that stability is high.
Purpose of the present invention can be achieved through the following technical solutions: a kind of high-power LED drive circuit, it is characterized in that, and comprise
To the alternating current rectification module that carries out rectification of input,
The driver module that one end is connected with described rectification module,
Transformation module, the light source module that is connected with the other two ends of described driver module respectively.
The alternating current of input is the described rectification module of input behind insurance resistance, quick piezoresistance.Rectification module is used for the alternating current of input is carried out converting pulse voltage to after the rectification, and provides stable operating voltage for the subsequent conditioning circuit module.
Drive circuit is used to and keeps transformation module, light source module operate as normal in this LED power circuit, and the described light source module of described transformation module controls also provides operating current for led light source.
Described driver module comprises a monolithic integrated switching circuit.
Described monolithic integrated switching circuit comprises three terminals, is respectively control end, source electrode, drain electrode, and control end is connected with described light source module, and source electrode is connected with described driver module, and drain electrode is connected with described transformation module.
The described monolithic integrated switching circuit control utmost point is connected with ground through a bypass electric capacity, and described shunt capacitance compensates and sets control loop and restarts frequency automatically.
Described light source module comprises the optocoupler feedback loop, and described optocoupler feedback loop changes the output voltage duty ratio by regulating described control end electric current.
Described light source module is connected with the LED of one or more series connection.
Also comprise one and absorb circuit in order to the drain electrode overvoltage that is limited in the peak voltage that shutdown moment high frequency transformer leakage inductance produced.
Described drain electrode overvoltage absorbs circuit and comprises diode, is connected with described diode cathode and resistance and electric capacity parallel with one another.
The beneficial effect that the present invention reached: high-power LED drive circuit of the present invention is simple in structure, low in energy consumption, at the bottom of the cost, stability is high, the current stabilization that provides.Has the optocoupler feedback loop, at wide input voltage range (150～250V) and (1～3 LED series connection of wide LED load variations scope, in the output voltage range 11.4～31.5V), the variation of output current is very little, be 0.41～0.44A, constant current accuracy reaches ± 5 ﹪, can satisfy the power reguirements of LED fully.
Description of drawings
Fig. 1 is an execution mode schematic diagram of high-power LED drive circuit of the present invention;
The internal structure schematic diagram of Fig. 2 monolithic integrated switching circuit TOP224Y.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.Following examples only are used for technical scheme of the present invention more clearly is described, and can not limit protection scope of the present invention with this.
As shown in Figure 1, a kind of high-power LED drive circuit is typical single-ended flyback switching circuit, and operating frequency inner setting is 100KHZ.Comprise that the alternating current to input carries out the driver module 2 that rectification module 1, one end of rectification is connected with rectification module 1, transformation module 3, the light source module 4 that is connected with driver module 2 other two ends respectively.Driver module 4 comprises a monolithic integrated switching circuit IC1, and monolithic integrated switching circuit IC1 selection model is the triode of TOP224Y in the present embodiment.Input AC 220V voltage is output as the switch constant-current circuit of constant current 0.4A, output voltage 10～32V behind driver module 2.Transformation module 3 comprises transformer T, and transformation module 3 control light source modules 4 provide operating current for led light source.Light source module 4 comprises the optocoupler feedback loop, and the optocoupler feedback loop is by regulating the control end electric current I of monolithic integrated switching circuit IC1
CChange the output voltage duty ratio, realize providing stable current/voltage to LED.
The course of work: alternating current 220V voltage by rectifier bridge VD1 rectification, and through capacitor C 1 filtering, is set up the practical power of the dc high-voltage of about 280V as this circuit at capacitor C 1 two ends after resistance R 1, resistance R 2.Resistance R 1 adopts RF10 type insurance resistance, will be blown when circuit is short-circuited, and circuit is played the short-circuit protection effect.Resistance R 2 adopts NTC type negative tempperature coefficient thermistor, plays restriction combined floodgate impulse current, and in the energized starting stage, at normal temperatures, it has bigger resistance value switching current can be limited in permissible value; Along with flowing through of operating current, its temperature rises gradually, and resistance drops to a certain less stationary value, and normal power consumption is little, and the circuit operate as normal is had no adverse effects.Diode VD2, resistance R 3, capacitor C 2 are formed the drain electrode overvoltage and are absorbed circuit, and in order to be limited in the peak voltage that shutdown moment high frequency transformer leakage inductance is produced, the power tube in the protection monolithic integrated switching circuit TOP224Y is not damaged.Capacitor C 6 is the control end shunt capacitance, and it can compensate and set and restart frequency automatically control loop.When C6=47 μ F, restarting frequency automatically is 1.2Hz.During operate as normal, the representative value of control voltage U c is 5.7V.
The constant current effect of this circuit relies on the former reason optocoupler of Current Negative Three-Point Capacitance feedback loop to realize equally: resistance R 10 is current sampling resistors.Triode VT1 is an error amplifier, and the role of reference voltage is also served as in its emitter junction pressure drop (about 0.6V).Work as output voltage
U 0 ↑ or the LED pressure drop ↓ → the LED electric current
I 0 ↑ →
U R10 ↑ →
U Eb ↑ → VT1/
I b ↑ → VT1/
I C ↑ → optocoupler light-emitting diode
I F ↑ → optocoupler receiving tube
I E ↑ → IC1 control end electric current
I C ↑ → IC1/ duty ratio ↓ → output voltage
U 0 ↓ → LED electric current
I 0 ↓, thereby realized the constant current purpose.Vice versa.
Output constant current computing formula:
I 10 =0.6/
R 10
The open circuit overvoltage protection effect of circuit relies on the voltage negative feedback principle to be realized by the optocoupler feedback loop equally: output voltage
U 0 Through resistance R 8, resistance R 9 dividing potential drops, after voltage-stabiliser tube VD punctures, the feedback base current is provided for triode VT1, the process of back during with constant current principle the same, output voltage the most at last
U 0 Be limited on the set point.
The short-circuit protection effect of circuit is to be provided with overcurrent protection in sheet, can play the short-circuit protection effect.Because during output short-circuit, output voltage
U 0 All very low with feedback voltage, make triode VT1 and optocoupler IC2 lose ability to work.
Circuit has overtemperature protection: when 135 ℃ of junction temperature of chip, automatically shut down output stage.
The constant current effect of this circuit, at wide input voltage range (150～250V) and (1～3 LED series connection of wide LED load variations scope, under output voltage range 11.4～31.5V) conditions, the variation of output current is very little, be 0.41～0.44A, constant current accuracy reaches ± 5 ﹪, can satisfy the power reguirements of LED fully.
In addition, because chip adopts cmos circuit, power consumption own is very low, and power-efficient can reach more than 80 ﹪, and good application prospects is arranged.
Monolithic integrated switching circuit TOP224Y is a three terminal device; its internal structure block diagram as shown in Figure 2; it also has the necessary PWM controller of Switching Power Supply, 100KHZ high-frequency generator, high voltage startup biasing circuit, error amplifier and overcurrent, overtemperature protection etc. power switch pipe MOSFET all to integrate.It is minimum that peripheral cell reduces to, and simplified the design and the making of Switching Power Supply so widely.Its three terminals are respectively control utmost point C, source S, drain D.Control utmost point C utilizes the FEEDBACK CONTROL electric current I
CThe size duty ratio of regulating the output switching tube, link to each other simultaneously, for chip provides operate as normal required bias current, moreover as electrical power by-pass, restart tie point with building-out capacitor automatically with inner shunt regulator, error amplifier.Drain D links to each other with the drain electrode of sheet internal power switching tube, and between the starting period, the high-tension current source provides bias current through internal switch to internal circuit, or the test point of internal power switching tube operating current.Source S links to each other with the source electrode of sheet internal power switching tube, as the high voltage source return terminal, simultaneously as primary side control circuit publicly and datum mark.
Above-described embodiment, just the specific embodiment of the present invention is a kind of, and common variation that those skilled in the art are done in the technical program scope and replacement all should be included in protection scope of the present invention.
Claims (10)
1. a high-power LED drive circuit is characterized in that, comprises
To the alternating current rectification module that carries out rectification of input,
The driver module that one end is connected with described rectification module,
Transformation module, the light source module that is connected with the other two ends of described driver module respectively.
2. a kind of high-power LED drive circuit according to claim 1 is characterized in that, the alternating current of input is the described rectification module of input behind insurance resistance, quick piezoresistance.
3. a kind of high-power LED drive circuit according to claim 1 is characterized in that, the described light source module of described transformation module controls also provides operating current for led light source.
4. a kind of high-power LED drive circuit according to claim 1 and 2 is characterized in that, described driver module comprises a monolithic integrated switching circuit.
5. a kind of high-power LED drive circuit according to claim 1, it is characterized in that, described monolithic integrated switching circuit comprises three terminals, be respectively control end, source electrode, drain electrode, control end is connected with described light source module, source electrode is connected with described driver module, and drain electrode is connected with described transformation module.
6. a kind of high-power LED drive circuit according to claim 5 is characterized in that, the described monolithic integrated switching circuit control utmost point is connected with ground through a bypass electric capacity, and described shunt capacitance compensates and sets control loop and restarts frequency automatically.
7. a kind of high-power LED drive circuit according to claim 5 is characterized in that described light source module comprises the optocoupler feedback loop, and described optocoupler feedback loop changes the output voltage duty ratio by regulating described control end electric current.
8. a kind of high-power LED drive circuit according to claim 1 is characterized in that, described light source module is connected with the LED of one or more series connection.
9. a kind of high-power LED drive circuit according to claim 1 is characterized in that, also comprises one and absorbs circuit in order to the drain electrode overvoltage that is limited in the peak voltage that shutdown moment high frequency transformer leakage inductance produced.
10. a kind of high-power LED drive circuit according to claim 9 is characterized in that, described drain electrode overvoltage absorbs circuit and comprises diode, is connected with described diode cathode and resistance and electric capacity parallel with one another.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110179478A CN102291887A (en) | 2011-06-30 | 2011-06-30 | High-power light emitting diode (LED) driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110179478A CN102291887A (en) | 2011-06-30 | 2011-06-30 | High-power light emitting diode (LED) driving circuit |
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| CN102291887A true CN102291887A (en) | 2011-12-21 |
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| CN201110179478A Pending CN102291887A (en) | 2011-06-30 | 2011-06-30 | High-power light emitting diode (LED) driving circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594116A (en) * | 2012-03-06 | 2012-07-18 | 广州金升阳科技有限公司 | Power starting circuit |
| CN102612225A (en) * | 2012-03-06 | 2012-07-25 | 广州金升阳科技有限公司 | Power circuit capable of being used for LED drive |
| CN103458556A (en) * | 2012-05-30 | 2013-12-18 | 海洋王照明科技股份有限公司 | Constant power control circuit |
| CN106972763A (en) * | 2017-05-19 | 2017-07-21 | 广西南宁红运高照电子科技有限公司 | A kind of LED power |
| CN107517516A (en) * | 2017-08-15 | 2017-12-26 | 山东旭程照明科技有限公司 | A kind of double bright control systems of radar induction LED driving |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202160305U (en) * | 2011-06-30 | 2012-03-07 | 南京化工职业技术学院 | Large-power LED driving circuit |
-
2011
- 2011-06-30 CN CN201110179478A patent/CN102291887A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202160305U (en) * | 2011-06-30 | 2012-03-07 | 南京化工职业技术学院 | Large-power LED driving circuit |
Non-Patent Citations (1)
| Title |
|---|
| 柳国宪: "基于绿色光源LED的开关型恒流驱动电路设计", 《长沙航空职业技术学院学报》, vol. 11, no. 1, 31 March 2011 (2011-03-31) * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594116A (en) * | 2012-03-06 | 2012-07-18 | 广州金升阳科技有限公司 | Power starting circuit |
| CN102612225A (en) * | 2012-03-06 | 2012-07-25 | 广州金升阳科技有限公司 | Power circuit capable of being used for LED drive |
| CN102612225B (en) * | 2012-03-06 | 2014-09-03 | 广州金升阳科技有限公司 | Power circuit capable of being used for LED drive |
| CN102594116B (en) * | 2012-03-06 | 2014-09-24 | 广州金升阳科技有限公司 | Power starting circuit |
| CN103458556A (en) * | 2012-05-30 | 2013-12-18 | 海洋王照明科技股份有限公司 | Constant power control circuit |
| CN103458556B (en) * | 2012-05-30 | 2017-10-27 | 海洋王照明科技股份有限公司 | Constant power control circuit |
| CN106972763A (en) * | 2017-05-19 | 2017-07-21 | 广西南宁红运高照电子科技有限公司 | A kind of LED power |
| CN107517516A (en) * | 2017-08-15 | 2017-12-26 | 山东旭程照明科技有限公司 | A kind of double bright control systems of radar induction LED driving |
| CN107517516B (en) * | 2017-08-15 | 2023-10-27 | 山东旭程照明科技有限公司 | Radar induction LED driven double-brightness control system |
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Application publication date: 20111221 |