CN101841952B - Drive circuit realizing constant current of two paths of LEDs by utilizing capacitors - Google Patents
Drive circuit realizing constant current of two paths of LEDs by utilizing capacitors Download PDFInfo
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- CN101841952B CN101841952B CN 201010125609 CN201010125609A CN101841952B CN 101841952 B CN101841952 B CN 101841952B CN 201010125609 CN201010125609 CN 201010125609 CN 201010125609 A CN201010125609 A CN 201010125609A CN 101841952 B CN101841952 B CN 101841952B
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Abstract
The invention discloses a drive circuit realizing the constant current of two paths of LEDs by utilizing capacitors, which comprises a high-frequency pulse AD power supply, a blocking capacitor, a first diode, a second diode, a first inductor, a second inductor, a first filter capacitor, a second filter capacitor and two paths of LED loads. The drive circuit has the advantages that: 1, the constant current of the two paths of LED loads is realized by a primary conversion circuit, cost is low, no additional control circuit is required and reliability is high; 2, current equalization efficiency is high and current equalization is not influenced by a voltage difference between the LED loads; and 3, the efficiency of the current equalization realized by the blocking capacitor is high, and the loss of the current equalization is relatively lower even though the voltage difference of the two paths of LEDs is relatively greater.
Description
Technical field
The present invention relates to a kind of drive circuit that utilizes electric capacity to realize the two paths of LED constant current.Should be a kind of circuit of realizing the equilibrium of two paths of LED load current by electric capacity specifically.
Background technology
For the application of LED multiple constant current control driver, the most frequently used scheme has: 1. constant voltage module+multichannel non-isolation DC/DC constant-current circuit (such as the BUCK circuit); 2. the adjustable Voltage stabilizing module of voltage+multi-channel linear is adjusted constant-current circuit.
For the first scheme, with reference to Fig. 1, the output of constant voltage module is as the input of multiple constant current circuit, and every road constant-current circuit is done separately constant current control, is easy to guarantee the current-sharing of multichannel output current.But because the voltage of constant voltage module and the voltage of LED generally have larger pressure reduction, so the efficient of rear class multichannel DC/DC constant-current circuit can be very not high, and the cost of multichannel constant-current control circuit is very high.
For first scheme, with reference to Fig. 2, do linear the adjustment with metal-oxide-semiconductor or triode and realize multiple constant current control, the output voltage of prime Voltage stabilizing module is followed rear class constant current linear regulation circuit, the output voltage of Voltage stabilizing module is adjusted the highest Lu Lvegao of output voltage in the constant-current circuit than multi-channel linear all the time, makes linear regulation circuit can realize that in the output of every road the power consumption on the basis of accurate constant current control approaches minimum all the time.Although this scheme circuit cost is low, the current sharing of every paths of LEDs is good, and short circuit is the common failure mode of LED, and when the pressure reduction of LED multi-path was larger, the linear power consumption of adjusting pipe was very large, makes the led driver heating serious.
Summary of the invention
The present invention is directed to the problems referred to above, propose a kind of high efficiency, low cost, the well behaved two-way of current-sharing output LED constant-current drive circuit, and when the pressure reduction of LED load was larger, efficient also can be very high.
The technical scheme that addresses the above problem employing is: a kind of drive circuit that utilizes electric capacity to realize the two paths of LED constant current, comprise the high frequency pulse AC power supply, capacitance, the first diode, the second diode, the first inductance, the second inductance, the first filter capacitor, the second filter capacitor and two paths of LED load, an end that it is characterized in that an output termination capacitance of described high frequency pulse AC power supply, the negative electrode of another termination the first diode of capacitance and an end of the first inductance, the anode of another termination the first filter capacitor of the first inductance and the anode of the first paths of LEDs load, the anode of described the first diode connects the anode of the second diode, the negative terminal of the first filter capacitor, the negative terminal of the second filter capacitor, the negative terminal of the first paths of LEDs load and the second paths of LEDs load, the negative electrode of another output termination the second diode of high frequency pulse AC power supply and an end of the second inductance, the anode of another termination the second filter capacitor of the second inductance and the anode of the second paths of LEDs load.
A kind of drive circuit that utilizes electric capacity to realize the two paths of LED constant current of the present invention, described the first diode and the second diode are as rectification circuit, give respectively the two paths of LED load supplying, the first filter capacitor, the second filter capacitor strobe, because the existence of capacitance, when the pressure drop of two paths of LED lamp not simultaneously, can pass through capacitance balance two paths of LED voltage difference, the current average of two paths of LED lamp is equated; Ideally, when the two paths of LED pressure drop equated fully, the voltage at capacitance two ends was zero.
According to the present invention, described high frequency pulse AC power supply is voltage source or current source.
The invention has the beneficial effects as follows:
1. realize load current-sharing between two paths of LED by primary conversion circuit, cost is low, does not need extra control circuit, and reliability is high.
2. current-sharing precision is high, not affected by LED load pressure reduction.
3. realize that by capacitance the efficient of current-sharing is high, even when two paths of LED pressure reduction is larger, realize that the loss of current-sharing is also less.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 prior art circuits block diagram one.
Fig. 2 prior art circuits block diagram two.
Fig. 3 a kind of circuit block diagram that utilizes electric capacity to realize the drive circuit of two paths of LED constant current of the present invention.
Fig. 4 embodiment as an example of half-bridge circuit example of the present invention.
Specific embodiment
With reference to Fig. 3, a kind of drive circuit that utilizes electric capacity to realize the two paths of LED constant current, it is characterized in that: comprise the high frequency pulse AC power supply, capacitance C1, diode D1, diode D2, inductance L 1, inductance L 2, filter capacitor C2, filter capacitor C3 and two paths of LED load, an end that it is characterized in that an output termination capacitance C1 of described high frequency pulse AC power supply, the negative electrode of another terminating diode D1 of capacitance C1 and an end of inductance L 1, another termination filter capacitor C2 of inductance L 1 and the anode of LED load 1, the anode of described diode D1 connects the anode of diode D2, filter capacitor C2, filter capacitor C3, the negative terminal of LED load 1 and LED load 2, the negative electrode of another output terminating diode D2 of high frequency pulse AC power supply and an end of inductance L 2, another termination filter capacitor C3 of inductance L 2 and the anode of LED load 2.
With reference to Fig. 4, a kind of drive circuit that utilizes electric capacity to realize the two paths of LED constant current, embodiment as an example of half-bridge circuit example, specifically: the first end of the positive termination switching tube S1 of described direct voltage Vdc, the first end of the second termination switching tube S2 of switching tube S1 and the former limit Motor Winding Same Name of Ends of main transformer T1, the negative terminal of the second termination direct voltage Vdc of switching tube S2 and an end of capacitor C 4, the non-same polarity of the former limit of another termination winding of capacitor C 4, the secondary Motor Winding Same Name of Ends of main transformer T1 connects the end of capacitance C1, the negative electrode of another terminating diode D1 of capacitance C1 and an end of inductance L 1, another termination filter capacitor C2 of inductance L 1 and the anode of LED load 1, the anode of described diode D1 connects the anode of diode D2, filter capacitor C2, filter capacitor C3, the negative terminal of LED load 1 and LED load 2, the secondary winding non-same polarity of main transformer T1 connects the negative electrode of diode D2 and an end of inductance L 2, another termination filter capacitor C3 of inductance L 2 and the anode of LED load 2.
At last, it is also to be noted that, what more than enumerate only is specific embodiments of the invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought the protection range of inventing.
Claims (2)
1. drive circuit that utilizes electric capacity to realize the two paths of LED constant current, comprise the high frequency pulse AC power supply, capacitance (C1), the first diode (D1), the second diode (D2), the first inductance (L1), the second inductance (L2), the first filter capacitor (C2), the second filter capacitor (C3) and two paths of LED load, an end that it is characterized in that an output termination capacitance (C1) of described high frequency pulse AC power supply, the negative electrode of another termination the first diode (D1) of capacitance (C1) and an end of the first inductance (L1), the anode of another termination the first filter capacitor (C2) of the first inductance (L1) and the anode of the first paths of LEDs load, the anode of described the first diode (D1) connects the anode of the second diode (D2), the negative terminal of the first filter capacitor (C2), the negative terminal of the second filter capacitor (C3), the negative terminal of the first paths of LEDs load and the second paths of LEDs load, the negative electrode of another output termination the second diode (D2) of high frequency pulse AC power supply and an end of the second inductance (L2), the anode of another termination the second filter capacitor (C3) of the second inductance (L2) and the anode of the second paths of LEDs load.
2. the drive circuit that utilizes electric capacity to realize the two paths of LED constant current as claimed in claim 1 is characterized in that described high frequency pulse AC power supply is voltage source or current source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010125609 CN101841952B (en) | 2010-03-17 | 2010-03-17 | Drive circuit realizing constant current of two paths of LEDs by utilizing capacitors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010125609 CN101841952B (en) | 2010-03-17 | 2010-03-17 | Drive circuit realizing constant current of two paths of LEDs by utilizing capacitors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101841952A CN101841952A (en) | 2010-09-22 |
| CN101841952B true CN101841952B (en) | 2013-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010125609 Expired - Fee Related CN101841952B (en) | 2010-03-17 | 2010-03-17 | Drive circuit realizing constant current of two paths of LEDs by utilizing capacitors |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102437744B (en) * | 2012-01-12 | 2013-12-18 | 矽力杰半导体技术(杭州)有限公司 | Self current-balancing power supply circuit with multiplexed output |
| CN108521697A (en) * | 2018-04-28 | 2018-09-11 | 福州大学 | A kind of LED automatic current equalizing driving circuits based on isolated form CUK converters |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201114882Y (en) * | 2007-08-03 | 2008-09-10 | 鹤山丽得电子实业有限公司 | A driving circuit for improved universal LED lighting bulb |
| JP2009200257A (en) * | 2008-02-21 | 2009-09-03 | Sharp Corp | Led drive circuit |
| JP4952753B2 (en) * | 2009-07-28 | 2012-06-13 | Ｔｄｋ株式会社 | Image display device |
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2010
- 2010-03-17 CN CN 201010125609 patent/CN101841952B/en not_active Expired - Fee Related
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