CN101267695A - A DC supplied voltage increase and current constant driving circuit for LED floodlight - Google Patents
A DC supplied voltage increase and current constant driving circuit for LED floodlight Download PDFInfo
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- CN101267695A CN101267695A CNA2007100865158A CN200710086515A CN101267695A CN 101267695 A CN101267695 A CN 101267695A CN A2007100865158 A CNA2007100865158 A CN A2007100865158A CN 200710086515 A CN200710086515 A CN 200710086515A CN 101267695 A CN101267695 A CN 101267695A
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Abstract
The invention provides a booster constant current driving circuit for a direct current powered LED lighting lamp, comprising: a direct current driving circuit, an inductor, a switching diode, a filtering capacitor, a current sampling resistor and load, wherein, the inductor is connected between an input voltage pin and a switch pin of the direct current driving circuit, the switching diode is connected between the switch pin of the direct current driving circuit and an output pin of the filtering capacitor, another pin of the filtering capacitor is grounded, a circuit formed by series-connecting the current sampling resistor and the load is connected with the filtering capacitor in parallel, one end of the current sampling resistor is grounded and the other end is connected with a voltage feedback pin of the direct current driving circuit. The booster constant current driving circuit according to the invention has the technology characteristics of booster and constant current, solves problems of the prior LED lamp that the work current and lighting intensity are affected by environment temperature, work time and device parameters, and the utilization rate of a power supply is low.
Description
Technical field
The present invention relates to a kind of circuit, relate in particular to a kind of LED lighting voltage increase and current constant driving circuit of direct current supply.
Background technology
At present, the circuit of known LED lighting generally is to be made of DC-DC constant voltage out-put supply module, illumination LED single or a plurality of series connection the upper flow resistance of connecting again.When DC power supply is imported, the driving voltage that the output of DC-DC out-put supply module is constant, it is luminous to drive illumination LED.But there are the following problems for this LED floodlight circuit commonly used: the operating current of light fixture is subjected to the influence of ambient temperature very big.This is because when constant voltage driving, and the thermal characteristics of LED device shows as that its operating current has a long way to go under high temperature and low temperature environment.Because the variation of electric current, the illumination of light fixture also correspondingly change, promptly illumination is non-constant.Same reason, because LED device and drive circuit and accessory circuit will produce heat when work, even ambient temperature is constant, the operating current of light fixture and illumination also can be subjected to the influence of self-heating, self temperature that shows as light fixture is along with the prolongation of its continuous working period constantly raises, and its operating current and illumination constantly change along with the prolongation of operating time.Owing to be constant voltage driving, so the illumination of light fixture is subjected to the influence of concrete device operating voltage parameter very big, adopt the device of different manufacturers, the operating current gap of light fixture is also very big, and the replacement of device is very poor.
Owing to do not address the above problem well technically, cause guaranteeing that all LED devices all are operated under the recommended current, this also just can not guarantee the working life of LED device.When electric current is higher than recommended current, even several milliamperes, the real work life-span of LED device also can be well below its theoretical life-span.
In addition, in the design of led drive circuit, roughly the same for the operating state of the service efficiency that guarantees its power supply and each LED, must take all factors into consideration the optimum current parameter of each LED and the resistance size of current-limiting resistance, the voltage of DC driven is low more, and the service efficiency of power supply is just low more.This be because: at first, in general the conversion efficiency of reduction voltage circuit will be lower than the conversion efficiency of booster circuit; Secondly, voltage is low more, the series connection number of LED is just few more, the mode of a plurality of series connection that can't the adopt discrete LED parameter error counteracting that adds up, under the condition of constant voltage power supply, roughly the same for the operating current that guarantees each LED, just must improve the resistance of current-limiting resistance, this also makes the effective power percentage step-down of power supply, and efficient is very low.
Summary of the invention
Be subjected to the influence of ambient temperature, operating time, device parameters for the illumination that solves existing LED light fixture, operating current is non-constant, the LED life-span can't guarantee and the inefficient problem of power utilization, the invention provides a kind of LED lighting voltage increase and current constant driving circuit of direct current supply, this circuit has guaranteed that the LED light fixture always works under the constant recommended current state, be not subjected to the influence of ambient temperature, operating time, device parameters, guaranteed that illumination is constant, guarantee the useful life of LED, and improved power utilization efficient.
The technical scheme that the present invention is adopted for achieving the above object is: the LED lighting voltage increase and current constant driving circuit that designs a kind of direct current supply, comprise: dc drive circuit, inductance, switching diode, filter capacitor, current sampling resistor and load, wherein, described inductance is connected between the input voltage pin and switch pin of described dc drive circuit, described switching diode is connected between the output pin of the switch pin of described dc drive circuit and described filter capacitor, another pin ground connection of described filter capacitor, the circuit of being formed after described circuit sample resistance is connected with described load is in parallel with described filter capacitor, an end ground connection of wherein said current sampling resistor, the other end is connected with the Voltage Feedback pin of described dc drive circuit.
According to described voltage increase and current constant driving circuit, wherein said load is made of the LED of a plurality of series connection upper flow resistance of connecting again.
According to described voltage increase and current constant driving circuit, wherein said load is that the array that a plurality of described unit of unit composes in parallel constitutes by the series limiting resistor of connecting again with a plurality of LED.
According to described voltage increase and current constant driving circuit, comprise that also ripple adjusts electric capacity, be connected between the Voltage Feedback pin of the output pin of described filter capacitor and described dc drive circuit.
According to described voltage increase and current constant driving circuit, also comprise input filter capacitor, be connected between the input voltage pin and ground of described dc drive circuit.
According to described voltage increase and current constant driving circuit, wherein said switching diode is the Schottky switching diode.
The invention has the beneficial effects as follows, take a sample the at any time voltage of its Voltage Feedback pin of DC-DC drive circuit, in this circuit since the sampling current sample resistance on voltage, reality promptly is the operating current of sampling load, so the DC-DC drive circuit is adjusted the duty ratio and the break-make frequency of its switch on and off according to the sampling situation, to keep the loaded work piece current constant.Ripple is adjusted electric capacity and is used for reducing ripple, raises the efficiency.In addition, because circuit adopts boosting mode, the power circuit operating efficiency partly of comparing the circuit of step-down mode has improved more than 10%.Guaranteed that the LED light fixture always works under the constant recommended current state, be not subjected to the influence of ambient temperature, operating time, device parameters, also just guaranteed simultaneously the useful life of the constant and LED of illumination, and improved power utilization efficient.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Wherein description of reference numerals is as follows:
IC1 DC-DC drive circuit L1 energy storage inductor
D1 switching diode E2 output filter capacitor
R1 current sampling resistor C1 ripple is adjusted electric capacity
LED LAMP load R1 current sampling resistor
Vout output pin SWC switch pin
CMPR Voltage Feedback pin VCC input voltage pin
GND grounding pin Vin input voltage
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is circuit theory diagrams of the present invention.The LED lighting of direct current supply of the present invention comprises DC-DC drive circuit IC1, energy storage inductor L1, switching diode D1, input filter capacitor E1, output filter capacitor E2, current sampling resistor R1, ripple adjustment capacitor C 1 with voltage increase and current constant driving circuit as shown in Figure 1.The load LED LAMP that is driven is to be the array (perhaps being made of the upper flow resistance of being connected again by the illumination LED of a plurality of series connection) that a plurality of unit of unit compose in parallel with a plurality of illumination LED series limiting resistor.
Input filter capacitor E1 is connected between the input voltage pin VCC and ground of DC-DC drive circuit IC1, and effect is that the DC power supply of input is carried out filtering and energy storage.
Energy storage inductor L1 is connected between the input voltage pin VCC and switch pin SWC of DC-DC drive circuit IC1, effect is a storage power when the switch conduction of DC-DC drive circuit IC1, switch releases energy when disconnecting, and the anti-sharp effect of inductance L 1 produces the output voltage that is higher than input voltage value when disconnecting by switch simultaneously.
Switching diode D1 (being preferably the Schottky switching diode) is connected between the output pin Vout of the switch pin SWC of DC-DC drive circuit IC1 and output filter capacitor, effect is to isolate output circuit and control circuit when the switch conduction of DC-DC drive circuit IC1, prevent that energy from flowing backwards, conducting when switch disconnects, make energy be released into load LED LAMP, give output capacitance E2 charging simultaneously from energy storage inductor L1.
Output filter capacitor E2 is connected between switching diode D1 and the ground, effect is storage power and filtering, releases energy during the switch conduction of DC-DC drive circuit IC1, in switch off period stored energy, and it is constant to play the maintenance output voltage, the effect of filtering ripple.
Current sampling resistor R1 is connected between the Voltage Feedback pin CMPR and ground of DC-DC drive circuit IC1, being about to current sampling resistor R1 and load LED LAMP is in series, the operating current signal of load LED LAMP is converted into voltage signal, for the Voltage Feedback pin CMPR sampling of DC-DC drive circuit IC1.
Ripple is adjusted the two ends that capacitor C 1 is connected load LED LAMP, plays acceleration the ripple of output voltage is fed back to the effect of the Voltage Feedback pin of DC-DC drive circuit IC1, helps reducing ripple, raises the efficiency.
Load LED LAMP is connected between output capacitance E2 and the current sampling resistor R1, and is luminous under the driving of constant current, keeps illumination constant.Load LED LAMP is to be the array that a plurality of unit of unit compose in parallel with a plurality of illumination LED series limiting resistor, owing to be booster circuit, the series connection quantity of LED can be a lot, help the error accumulation of a plurality of discrete LED operating voltage parameters is offset, so the voltage at every group of LED two ends is very approaching, this also helps reducing the value of current-limiting resistance, in addition, under fixing operating current, the quantity of series LED is many more, the value of current-limiting resistance is more little, and the utilance of power supply is also just high more.
When input voltage vin was powered, DC-DC drive circuit IC1 started working, and switch pin SWC produces the pulse break-make, when switch conduction, gave energy storage inductor L1 power supply, and filter capacitor E2 discharge simultaneously keeps output voltage constant; When switch disconnected, energy storage inductor L1 discharged by switching diode D1, supply load LED LAMP electric current, output capacitance E2 energy storage simultaneously.Take a sample the at any time voltage of its Voltage Feedback pin CMPR of DC-DC drive circuit IC1 is that ripple is adjusted capacitor C 1 coupling ripple to Voltage Feedback pin CMPR by the take a sample operating current of load LED LAMP of the mode of the voltage on the sample resistance R1 in this circuit.DC-DC drive circuit IC1 adjusts the duty ratio and the break-make frequency of its switch on and off according to the sampling situation, to keep load LED LAMP operating current constant.
Claims (6)
1. the LED lighting voltage increase and current constant driving circuit of a direct current supply is characterized in that, comprising: dc drive circuit, inductance, switching diode, filter capacitor, current sampling resistor and load, wherein,
Described inductance is connected between the input voltage pin and switch pin of described dc drive circuit,
Described switching diode is connected between the output pin of the switch pin of described dc drive circuit and described filter capacitor,
Another pin ground connection of described filter capacitor,
The circuit of being formed after described circuit sample resistance is connected with described load is in parallel with described filter capacitor, and an end ground connection of wherein said current sampling resistor, the other end are connected with the Voltage Feedback pin of described dc drive circuit.
2. voltage increase and current constant driving circuit as claimed in claim 1, wherein said load is made of the LED of a plurality of series connection upper flow resistance of connecting again.
3. voltage increase and current constant driving circuit as claimed in claim 1, wherein said load are that the array that a plurality of described unit of unit composes in parallel constitutes by the series limiting resistor of connecting again with a plurality of LED.
4. voltage increase and current constant driving circuit as claimed in claim 1 comprises that also ripple adjusts electric capacity, is connected between the Voltage Feedback pin of the output pin of described filter capacitor and described dc drive circuit.
5. voltage increase and current constant driving circuit as claimed in claim 1 also comprises input filter capacitor, is connected between the input voltage pin and ground of described dc drive circuit.
6. voltage increase and current constant driving circuit as claimed in claim 1, wherein said switching diode are the Schottky switching diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100865158A CN101267695A (en) | 2007-03-12 | 2007-03-12 | A DC supplied voltage increase and current constant driving circuit for LED floodlight |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100865158A CN101267695A (en) | 2007-03-12 | 2007-03-12 | A DC supplied voltage increase and current constant driving circuit for LED floodlight |
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| CN101267695A true CN101267695A (en) | 2008-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007100865158A Pending CN101267695A (en) | 2007-03-12 | 2007-03-12 | A DC supplied voltage increase and current constant driving circuit for LED floodlight |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102203690A (en) * | 2008-12-10 | 2011-09-28 | 凌特公司 | Current ripple reduction circuit for leds |
| CN102740559A (en) * | 2012-06-01 | 2012-10-17 | 安吉奇达照明有限公司 | LED (Light Emitting Diode) constant current driving device |
| CN103024977A (en) * | 2011-09-27 | 2013-04-03 | 瀚宇彩晶股份有限公司 | Light emitting diode driving circuit |
| CN106162992A (en) * | 2016-09-19 | 2016-11-23 | 江苏万邦微电子有限公司 | A kind of high-voltage driving circuit |
| CN110515293A (en) * | 2019-09-18 | 2019-11-29 | 深圳创维－Rgb电子有限公司 | A kind of wake-up system and awakening method |
| US11529942B2 (en) * | 2019-06-19 | 2022-12-20 | Mitsubishi Electric Corporation | Generator control system for vehicle |
-
2007
- 2007-03-12 CN CNA2007100865158A patent/CN101267695A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102203690A (en) * | 2008-12-10 | 2011-09-28 | 凌特公司 | Current ripple reduction circuit for leds |
| CN102203690B (en) * | 2008-12-10 | 2013-11-27 | 凌特公司 | Current ripple reduction circuit for leds |
| CN103024977A (en) * | 2011-09-27 | 2013-04-03 | 瀚宇彩晶股份有限公司 | Light emitting diode driving circuit |
| US8901833B2 (en) | 2011-09-27 | 2014-12-02 | Hannstar Display Corporation | LED driving circuit preventing light leakage issue |
| CN103024977B (en) * | 2011-09-27 | 2015-08-19 | 瀚宇彩晶股份有限公司 | Light emitting diode driving circuit |
| CN102740559A (en) * | 2012-06-01 | 2012-10-17 | 安吉奇达照明有限公司 | LED (Light Emitting Diode) constant current driving device |
| CN102740559B (en) * | 2012-06-01 | 2015-12-09 | 安吉奇达照明有限公司 | A kind of LED constant current drive unit |
| CN106162992A (en) * | 2016-09-19 | 2016-11-23 | 江苏万邦微电子有限公司 | A kind of high-voltage driving circuit |
| US11529942B2 (en) * | 2019-06-19 | 2022-12-20 | Mitsubishi Electric Corporation | Generator control system for vehicle |
| CN110515293A (en) * | 2019-09-18 | 2019-11-29 | 深圳创维－Rgb电子有限公司 | A kind of wake-up system and awakening method |
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Open date: 20080917 |