CN101267694A - A LED floodlight circuit driven by DC power supply under voltage increase and current constant mode - Google Patents
A LED floodlight circuit driven by DC power supply under voltage increase and current constant mode Download PDFInfo
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- CN101267694A CN101267694A CNA2007100865143A CN200710086514A CN101267694A CN 101267694 A CN101267694 A CN 101267694A CN A2007100865143 A CNA2007100865143 A CN A2007100865143A CN 200710086514 A CN200710086514 A CN 200710086514A CN 101267694 A CN101267694 A CN 101267694A
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Abstract
The invention provides a direct current powered LED lighting lamp circuit which is driven by a booster constant current manner, the LED lighting lamp circuit comprises a direct current driving circuit, an inductor, a switching diode, a filtering capacitor, a current sampling resistor and a light resource circuit, 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, the light resource circuit is formed by an array composed by combining a plurality of parallel-connected units which are formed by a plurality of series-connected lighting LEDs series-connected with current limiting resistors, and the light resource circuit is connected with the filtering capacitor in parallel, the current sampling resistor is one of the current limiting resistors of the light resource circuit, and the current sampling resistor is connected between a voltage feedback pin of the direct current driving circuit and the ground. The LED lighting lamp circuit according to the invention 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 the LED floodlight circuit that a kind of direct current supply adopts voltage increase and current constant mode to drive.
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 purpose of this invention is to provide the LED floodlight circuit that a kind of direct current supply adopts voltage increase and current constant mode to drive, this circuit has guaranteed that each LED of LED light fixture always works under the constant recommended current state, be not subjected to the influence of ambient temperature, operating time, device parameters, guarantee the useful life of the constant and LED of illumination, and improved the utilization ratio of power supply.
The technical scheme that the present invention is adopted for achieving the above object is: design the LED floodlight circuit that a kind of direct current supply adopts voltage increase and current constant mode to drive, comprise dc drive circuit, inductance, switching diode, filter capacitor, current sampling resistor and circuit of light sources, 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, described circuit of light sources by with after the series connection of a plurality of illumination LEDs again series limiting resistor be that the array that a plurality of described unit of unit composes in parallel constitutes, and described circuit of light sources is in parallel with described filter capacitor, described current sampling resistor is in the described current-limiting resistance of described circuit of light sources, and described current sampling resistor also is connected between the Voltage Feedback pin and ground of described dc drive circuit.
According to described LED floodlight 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 LED floodlight circuit, also comprise input filter capacitor, be connected between the input voltage pin and ground of described dc drive circuit.
According to described LED floodlight circuit, wherein said switching diode is the Schottky switching diode.
The invention has the beneficial effects as follows, by the voltage reality on the sampling current sample resistance promptly is operating current in sampling circuit of light sources one of them LED series loop, dc drive circuit is adjusted the duty ratio and the break-make frequency of its switch on and off according to the sampling situation, and is constant with the operating current that keeps circuit of light sources.Each LED that has guaranteed the LED light fixture always works under the constant recommended current state, is not subjected to the influence of ambient temperature, operating time, device parameters, has also just guaranteed simultaneously the useful life of the constant and LED of illumination.Ripple is adjusted electric capacity and is used for reducing ripple, raises the efficiency.In addition, because circuit adopts boosting mode, compare the circuit of step-down mode, the operating efficiency of power circuit part has improved more than 10%, has improved the utilization ratio of power supply.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Wherein Reference numeral 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 circuit of light sources 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 floodlight circuit that direct current supply of the present invention as shown in Figure 1 adopts voltage increase and current constant mode to drive comprises: the circuit of light sources LED LAMP that 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 and the array that is composed in parallel by a plurality of unit that with a plurality of illumination LED series limiting resistor are the unit constitute.
Input filter capacitor E1 is connected between the input voltage pin 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 E2, 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 circuit of light sources LED LAMP, give output filter capacitor 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 in the current-limiting resistance among the circuit of light sources LED LAMP, also is connected between the Voltage Feedback pin CMPR and ground of DC-DC drive circuit IC1 simultaneously.Because current sampling resistor R1 and one of them LED series loop of circuit of light sources LED LAMP are in series, and are converted into voltage signal by the operating current signal with this LED series loop, for the Voltage Feedback pin CMPR sampling of DC-DC drive circuit IC1.
Ripple is adjusted between the Voltage Feedback pin CMPR that capacitor C 1 is connected the output pin Vout of output capacitance E2 and DC-DC drive circuit IC1, play the effect of the ripple of output voltage being coupled to the voltage sampling pin CMPR of DC-DC drive circuit IC1, help reducing ripple, raise the efficiency.
Circuit of light sources LED LAMP is connected the two ends of output capacitance E2, and is luminous under the driving of constant current, keeps illumination constant.Circuit of light sources 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 was powered, DC-DC drive circuit IC1 started working, and switch pin SWC begins to produce the pulse break-make, when switch conduction, gave energy storage inductor L1 power supply, and filter capacitor E2 discharge simultaneously is to keep output voltage constant; When switch disconnected, energy storage inductor L1 supplied with circuit of light sources LED LAMP electric current, filter capacitor E2 energy storage simultaneously by switching diode D1 discharge.Take a sample the at any time voltage of its Voltage Feedback pin of DC-DC drive circuit IC1, be that ripple is adjusted capacitor C 1 coupling ripple to sampling pin CMPR by the take a sample operating current of circuit of light sources LED LAMP of the mode of the voltage on the sampling current 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 the circuit of light sources operating current constant.
Claims (4)
1. the LED floodlight circuit that direct current supply adopts voltage increase and current constant mode to drive is characterized in that, comprising: dc drive circuit, inductance, switching diode, filter capacitor, current sampling resistor and circuit of light sources, 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,
Described circuit of light sources by with after the series connection of a plurality of illumination LEDs again series limiting resistor be that the array that a plurality of described unit of unit composes in parallel constitutes, and described circuit of light sources is in parallel with described filter capacitor,
Described current sampling resistor is in the described current-limiting resistance of described circuit of light sources, and described current sampling resistor also is connected between the Voltage Feedback pin and ground of described dc drive circuit.
2. LED floodlight 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.
3. LED floodlight 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.
4. LED floodlight 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 |
|---|---|---|---|
| CNA2007100865143A CN101267694A (en) | 2007-03-12 | 2007-03-12 | A LED floodlight circuit driven by DC power supply under voltage increase and current constant mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100865143A CN101267694A (en) | 2007-03-12 | 2007-03-12 | A LED floodlight circuit driven by DC power supply under voltage increase and current constant mode |
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| CN101267694A true CN101267694A (en) | 2008-09-17 |
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| CNA2007100865143A Pending CN101267694A (en) | 2007-03-12 | 2007-03-12 | A LED floodlight circuit driven by DC power supply under voltage increase and current constant mode |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101720148A (en) * | 2009-07-21 | 2010-06-02 | 海洋王照明科技股份有限公司 | LED driving circuit and LED device |
| CN101996583A (en) * | 2010-12-02 | 2011-03-30 | 惠州Tcl移动通信有限公司 | Mobile phone, OLED (Organic Light Emitting Diode) display screen module and OLED display screen drive circuit |
| CN102625510A (en) * | 2012-03-14 | 2012-08-01 | 泰州市华强照明器材有限公司 | Adaptive light emitting diode (LED) fluorescent lamp |
| CN102711331A (en) * | 2012-06-12 | 2012-10-03 | 中山市山沃照明有限公司 | LED drive power supply |
| CN101730332B (en) * | 2008-10-14 | 2013-02-20 | 聚积科技股份有限公司 | Driving circuit of light-emitting diode |
| CN103167664A (en) * | 2011-12-13 | 2013-06-19 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) constant current drive circuit and LED lighting device |
| WO2014117294A1 (en) * | 2013-01-31 | 2014-08-07 | 视网科技股份有限公司 | Parallel light-emitting diode lamp having constant current device |
| US9333781B2 (en) | 2012-10-15 | 2016-05-10 | Shandong New Beijang Information Technology Co., Ltd. | Printer and method and device for controlling same |
| 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 |
| CN106686800A (en) * | 2016-08-31 | 2017-05-17 | 顺德职业技术学院 | LED (light-emitting diode) light decoration |
| US11529942B2 (en) * | 2019-06-19 | 2022-12-20 | Mitsubishi Electric Corporation | Generator control system for vehicle |
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2007
- 2007-03-12 CN CNA2007100865143A patent/CN101267694A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101730332B (en) * | 2008-10-14 | 2013-02-20 | 聚积科技股份有限公司 | Driving circuit of light-emitting diode |
| CN101720148A (en) * | 2009-07-21 | 2010-06-02 | 海洋王照明科技股份有限公司 | LED driving circuit and LED device |
| CN101720148B (en) * | 2009-07-21 | 2013-10-09 | 海洋王照明科技股份有限公司 | LED driving circuit and LED device |
| CN101996583A (en) * | 2010-12-02 | 2011-03-30 | 惠州Tcl移动通信有限公司 | Mobile phone, OLED (Organic Light Emitting Diode) display screen module and OLED display screen drive circuit |
| CN101996583B (en) * | 2010-12-02 | 2013-04-17 | 惠州Tcl移动通信有限公司 | Mobile phone, OLED (Organic Light Emitting Diode) display screen module and OLED display screen drive circuit |
| CN103167664B (en) * | 2011-12-13 | 2016-09-28 | 海洋王照明科技股份有限公司 | A kind of constant current driver circuit for LED and LED light device |
| CN103167664A (en) * | 2011-12-13 | 2013-06-19 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) constant current drive circuit and LED lighting device |
| CN102625510A (en) * | 2012-03-14 | 2012-08-01 | 泰州市华强照明器材有限公司 | Adaptive light emitting diode (LED) fluorescent lamp |
| CN102711331A (en) * | 2012-06-12 | 2012-10-03 | 中山市山沃照明有限公司 | LED drive power supply |
| US9333781B2 (en) | 2012-10-15 | 2016-05-10 | Shandong New Beijang Information Technology Co., Ltd. | Printer and method and device for controlling same |
| WO2014117294A1 (en) * | 2013-01-31 | 2014-08-07 | 视网科技股份有限公司 | Parallel light-emitting diode lamp having constant current device |
| CN106686800A (en) * | 2016-08-31 | 2017-05-17 | 顺德职业技术学院 | LED (light-emitting diode) light decoration |
| 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 |
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Open date: 20080917 |