CN102413610B - Automatic current sharing non-isolated multi-path LED drive circuit - Google Patents
Automatic current sharing non-isolated multi-path LED drive circuit Download PDFInfo
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- CN102413610B CN102413610B CN201110363055.5A CN201110363055A CN102413610B CN 102413610 B CN102413610 B CN 102413610B CN 201110363055 A CN201110363055 A CN 201110363055A CN 102413610 B CN102413610 B CN 102413610B
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Abstract
The invention discloses an automatic current sharing non-isolated multi-path LED drive circuit. The automatic current sharing non-isolated multi-path LED drive circuit comprises a driver circuit and an LED circuit, wherein, an output terminal of the driver circuit is connected with an input terminal of the LED circuit. The drive circuit direct current and a controller to drive on and off of two power switch tubes, and the power switch tubes are in series connection with a resonant inductor. The LED circuit is composed of at least two LED branch circuits which are in parallel connection. The LED branch circuits are composed of a blocking capacitor, two diodes, an energy storage capacitor, and a light emitting diode string which are connected. The LED drive circuit in the invention has a characteristic of automatic current sharing, and influence of inconsistent LED characteristic parameters on the drive circuit is inhibited. In addition, a circuit topology structure has the characteristics of simple structure and strong expansion capability, and LED current sharing of any number of branches can be realized conveniently.
Description
Technical field
The present invention relates to a kind of LED drive circuit, particularly a kind of automatic current sharing non-isolated multi-path LED drive circuit.
Background technology
Along with LED(Light-Emitting Diode) technique update, LED as lighting source presented that light efficiency is high, the life-span is long, response is fast and the feature such as environmental protection, started to replace conventional light source at a plurality of lighting fields.Although the power capacity of single LEDs has reached 10W, needing the illumination occasion of large area and high illumination, adopt the illumination scheme of single LEDs still can not meet the demands.For addressing this problem, often adopt the mode of parallel connection, series connection and series-parallel connection to be connected LED.There is inconsistency in the characterisitic parameter of considering LED, as shown in Figure 1; The requirement of LED driving voltage to the requirement of safety and reliability, the slightly large application scenario of current industrial power, is used LED series-parallel connection, as shown in Figure 2 more.
Yet, because each LED has different characteristic curves, even if the voltage being applied on LED is consistent, also can cause the electric current in each LED there are differences.This will make each LED under different working conditions, light life-span of reducing heavily loaded branch road, heavy heavily loaded branch road is damaged.Therefore must adopt current-sharing measure to each LED, mainly contain at present following several LED current-sharing measure:
(1) the in parallel use of LED element that selectivity characteristic is more consistent.This measure can be able to reduce by the lack of uniformity of the electric current of LED to a certain extent, but need to drop into a large amount of personnel and equipment is selected LED, and the difficulty operating in reality is larger.
(2) use ripe IC chip to realize the current-sharing of many independent LED.The LED drive circuit more complicated consisting of this mode, need to separately add optocoupler and amplifier, and cost is also higher.Generally be only suitable for the sharing control of 1-2 bar LED, be difficult to meet the sharing control of LED multi-path.
(3) in every LED branch road, be connected in series current control unit.Fig. 3 has provided the operation principle of this current-sharing mode.This mode need to be connected in series active device (metal-oxide-semiconductor, triode etc.) in every branch road, and these active devices work in amplification region more.Adopt in this way the multiple branch circuit LED drive circuit forming and generally have that cost is high, loss large, control complicated shortcoming, now fewer and feweri employing.
(4) in every LED branch road, series resistor, inductance or capacity cell carry out current-sharing.Fig. 4 has provided the schematic diagram of resistance current-sharing scheme, utilizes the resistance of the resistance of serial connection to realize current-sharing much larger than diode current flow resistance in this scheme.For improving in series resistor scheme, have this problem of efficiency low (in circuit, exhausted large how many energy consumption is on the resistance of serial connection), the scheme that various employings are connected in series electric capacity and inductance in branch road is proposed one after another.Due to electric capacity and inductance consumed power not in use, be therefore considered to a kind of desirable current-sharing scheme.Adopt inductance as current-sharing element solution in, between inductance, need to intercouple, the Design and manufacture relative complex of inductance, thereby this scheme is difficult to practical.At present, for realizing electric capacity as the scheme of equal fluid element, often adopt LLC resonant circuit independently as front stage circuits, thereby circuit topological structure more complicated, and can only solve 2N(N=1,2,3 ...) problem of bar branch road current-sharing.
In sum, in existing multi-channel LED current equalization method, resistance current equalizing method exists that circuit loss is large, electric capacity current equalizing method exists the LED monocycle work and circuital current is pulsating direct current problem, transformer (inductance) current equalizing method to have the complicated and shortcoming that is difficult to expand of circuit, the linear current method of every group of LED series active device exist circuit cost high, control complicated shortcoming, thereby these current equalizing methods all can not fine solution be organized the equal flow problem of LED parallel operation more.
Summary of the invention
The object of the invention is to consider the problems referred to above and do not need to isolate this feature for LED drive circuit under some application scenario, proposing a kind of automatic current sharing non-isolated multi-path LED drive circuit.Driving circuit structure of the present invention is simple, has the non-isolation effect of automatic current equalizing characteristic.This drive circuit merges the resonant capacitance in LLC circuit and the external electric capacity that stops, and has cancelled the isolating transformer in general flow equalizing circuit, thus drive circuit to have component number few and have an inherent automatic current equalizing characteristic; This drive circuit can also be realized the problem of arbitrary number branch circuit parallel connection, has good extended capability.
The object of the invention is achieved by the following technical programs:
A non-isolation type multipath LED drive circuit for automatic current equalizing, comprises drive circuit, LED circuit, and the output of drive circuit is connected with the input of LED circuit.
Described drive circuit comprises DC power supply Vc, controller, the first power switch pipe Q1, the second power switch pipe Q2, resonant inductance Lr; The positive pole of DC power supply Vc is connected with the source electrode of the first power switch pipe Q1, the negative pole of DC power supply Vc is connected with the drain electrode of the second power switch pipe Q2, controller is controlled the on off state of the first power switch pipe Q1 and the second power switch pipe Q2, and the drain electrode of the first power switch pipe Q1 is connected with the source electrode of the second power switch pipe Q2 and is connected in series with resonant inductance Lr.
LED circuit includes a paths of LEDs subcircuits or LED subcircuits some and that connect, and LED subcircuits includes first and stops capacitor C b1, the first diode D1, the second diode D2, the first storage capacitor C1, the first light-emitting diodes pipe string LED1; First stops that capacitor C b1 is connected with resonant inductance Lr, first stops that capacitor C b1 joins with the positive pole of the first diode D1 and the negative pole of the second diode D2 respectively, the negative pole of the first diode D1 joins with the first storage capacitor C1 positive pole and the first light-emitting diodes pipe string LED1 negative pole, the minus earth of the negative pole of the second diode D2 and the first storage capacitor C1, is connected a current sense resistor Rm between the negative pole of light-emitting diodes pipe string negative pole and DC power supply Vc.
In described each LED subcircuits first stops that each component parameters of capacitor C b1, the first diode D1, the second diode D2, the first storage capacitor C1, the first light-emitting diodes pipe string LED1 is mutually the same, or first in each LED subcircuits stops that at least arbitrary component parameters of capacitor C b1, the first diode D1, the second diode D2, the first storage capacitor C1, the first light-emitting diodes pipe string LED1 is not identical.
Described drive circuit comprises DC power supply Vc, controller, the first power switch pipe Q1, the second power switch pipe Q2, resonant inductance Lr; The positive pole of DC power supply Vc is connected with the source electrode of the first power switch pipe Q1, the negative pole of DC power supply Vc is connected with the drain electrode of the second power switch pipe Q2, controller is controlled the on off state of the first power switch pipe Q1 and the second power switch pipe Q2, and the drain electrode of the first power switch pipe Q1 is connected with the source electrode of the second power switch pipe Q2 and is connected in series with resonant inductance Lr.
LED circuit includes a paths of LEDs subcircuits or LED subcircuits some and that connect, and LED subcircuits includes first and stops capacitor C b1 and the AC equivalent resistance of connecting with it
; AC equivalent resistance
for:
, wherein: M is the LED lamp pearl number on LED branch road,
for the equivalent resistance of LED lamp pearl, first stops that one end of capacitor C b1 is connected with resonant inductance Lr, and first stops the other end and the AC equivalent resistance of capacitor C b1
connect.
The present invention utilizes resonant inductance Lr, first to stop capacitor C b1, form resonant tank, and resonant tank is worked near resonance point, flows through first and stops that the electric current of capacitor C b1 approaches sinusoidal wave.
The present invention stops that by changing resonant inductance Lr, first numerical value of capacitor C b1 can set the rated operational current of LED.
By be connected in series current sense resistor Rm in LED branch road, make the current feedback link in current closed-loop control be directed to DC link, simple and reliable.
The voltage that controller returns according to current sense resistor Rm, generates duty ratio and is about the on off state that 50% PWM drives signal controlling the first power switch pipe Q1 and the second power switch pipe Q2.
The present invention utilize first stop capacitor C b1 at ac circuit middle impedance much larger than the AC equivalent resistance being formed by each LED branch road, thereby suppressed the inconsistent situation of each paths of LEDs electric current that causes due to the inherent parameter inconsistency of LED.
The present invention's advantage is compared with prior art:
(1) drive circuit has inherent current balance type ability (balance mechanism is shown in Fig. 6, Fig. 7), can suppress preferably the impact of LED parameter inconsistency on circuit.
(2) drive circuit adopts the electric capacity of noenergy loss as equal fluid element, and drive circuit energy loss is little.
(3) the current feedback link in current closed-loop control is directed to DC link, simple and reliable.
(4) drive circuit has good extendibility, can easily extend to arbitrary number branch road.
(5) drive circuit can adopt general IC to control, applied widely.
The present invention be a kind of simple in structure, there is inherent current balance type ability and convenient and practical multipath LED drive circuit.
Accompanying drawing explanation
Fig. 1 LED characteristic curve.
Fig. 2 LED series-parallel connection work schematic diagram.
In Fig. 3 branch road, be connected in series the current-sharing scheme of current control unit.
The current-sharing scheme of series resistor element in Fig. 4 branch road.
Fig. 5 is topology diagram of the present invention.
Fig. 6 is the drive circuit equivalent model that the present invention proposes.
Fig. 7 is current-sharing schematic diagram of mechanism of the present invention.
Embodiment
Be illustrated in figure 5 topology diagram of the present invention.In Fig. 5, only given 2 paths of LEDs branch roads, when reality is used, can stop that the capacitor C b1 junction serial connection drive circuit that consistent circuit just can adopt the present invention to propose with LED branch road drives any LED to prop up way at resonant inductance Lr and first.
Be illustrated in figure 6 the drive circuit equivalent model that the present invention proposes, in Fig. 6,
(
i=1,2 ... n) be the AC equivalent resistance value of LED subcircuits.
Fig. 7 is current-sharing schematic diagram of mechanism of the present invention, in Fig. 7,
with
(
) be respectively
bar branch road and
the impedance of branch road,
be first to stop that capacitor C b1, second stops the equiva lent impedance of capacitor C b2 in ac circuit.When circuit working, the
bar branch road and
branch road (
) the ratio of current amplitude be:
When stopping the equivalent resistance that the AC impedance of electric capacity is gone here and there much larger than LED,
Formula (1) can be reduced to:
As
, formula (2) is further reduced to:
（4）
Therefore, a kind of automatic current sharing non-isolated multi-path LED drive circuit proposing in the present invention, as long as guarantee to stop that capacitance values is identical, and stop that electric capacity AC impedance is much larger than the AC equivalent resistance of LED branch road, the electric current that just can guarantee to flow through every branch road is consistent.
As shown in Figure 5, what the present invention proposed a kind of automatic current sharing non-isolated multi-path LED drive circuit comprises drive circuit, LED circuit, and the output of drive circuit is connected with the input of LED circuit.
Drive circuit comprises DC power supply Vc, controller, the first power switch pipe Q1, the second power switch pipe Q2, resonant inductance Lr; The positive pole of DC power supply Vc is connected with the source electrode of the first power switch pipe Q1, the negative pole of DC power supply Vc is connected with the drain electrode of the second power switch pipe Q2, controller is controlled the on off state of the first power switch pipe Q1 and the second power switch pipe Q2, and the drain electrode of the first power switch pipe Q1 is connected with the source electrode of the second power switch pipe Q2 and is connected in series with resonant inductance Lr.
LED circuit is connected in parallel by two paths of LED subcircuits, the one LED subcircuits stops capacitor C b1 by first, the first diode D1, the second diode D2, the first storage capacitor C1, the first light-emitting diodes pipe string LED1 forms, first stops that capacitor C b1 is connected with resonant inductance Lr, first stops that capacitor C b1 joins with the positive pole of the first diode D1 and the negative pole of the second diode D2 respectively, the negative pole of the first diode D1 joins with the first storage capacitor C1 positive pole and the first light-emitting diodes pipe string LED1 negative pole, the minus earth of the negative pole of the second diode D2 and the first storage capacitor C1, the 2nd LED subcircuits stops that by second capacitor C b2, the 3rd diode D3, the 4th diode D4, the second storage capacitor C2, the second light-emitting diodes pipe string LED2 form, second stops that capacitor C b2 is connected with resonant inductance Lr, second stops that capacitor C b2 joins with the positive pole of the 3rd diode D3 and the negative pole of the 4th diode D4 respectively, the negative pole of the 3rd diode D3 joins with the second storage capacitor C2 positive pole and the second light-emitting diodes pipe string LED2 negative pole, the minus earth of the negative pole of the 3rd diode D3 and the second storage capacitor C2.
When two paths of LED subcircuits is connected in parallel, the negative pole of the first light-emitting diodes pipe string LED1 is connected with the negative pole of the second light-emitting diodes pipe string LED2; Wherein between the first light-emitting diodes pipe string LED1 negative pole of a LED subcircuits and the negative pole of DC power supply Vc, be connected a current sense resistor Rm; Controller detects current sense resistor Rm both end voltage.
As shown in Figure 6, the equivalent electric circuit of automatic current sharing non-isolated multi-path LED drive circuit of the present invention.As shown in Figure 7, the current balance mechanism of automatic current sharing non-isolated multi-path LED drive circuit of the present invention.
The concrete implementation step of the equivalent electric circuit of LED branch road of the present invention is as follows:
1, the LED lamp pearl curve providing according to producer, looks into the rated current of the LED lamp pearl under curve calculation canonical parameter
, LED equivalent resistance
the rated voltage of LED lamp pearl now
.
2,, according to the restriction of the demand of brightness and single loop LED string number, calculate LED lamp pearl number M and the LED that whole drive circuit will drive and prop up way N.
3, according to the material of the type of the first power switch pipe Q1, the second power switch pipe Q2 in drive circuit and resonant inductance Lr used magnetic element, set the operating angle frequency of drive circuit
.
4, utilize formula (5) to calculate the AC equivalent resistance by half-wave rectifying circuit and LED forming circuit
.
5, utilize formula (6) to judge stream supply power voltage
whether satisfy the demands.
6, utilize formula (7) and operating frequency
calculate resonant inductance Lr and the numerical value that stops capacitor C b;
Wherein,
for deviation ratio,
.
7, utilize the resonance coefficient in formula (8) checking resonant tank
whether meet the demands, if there is
excessive or too small situation, needs the deviation ratio in formula (7)
revise, until obtain satisfied result.
8, utilize formula (9) to calculate the numerical value of the first storage capacitor C1, the second storage capacitor C2;
Wherein, in formula:
be the pressure reduction of the first storage capacitor C1, this numerical value equal to flow through LED maximum current fluctuation ratio (this parameter for can be set as rated operational current 5% and following);
for the work period of drive circuit.
9, the voltage returning by current sense resistor Rm, controller generates duty ratio and is about the on off state that 50% PWM drives signal controlling the first power switch pipe Q1 and the second power switch pipe Q2.
10, as detected, detect the voltage that resistance R m returns excessive, improve the PWM driving signal frequency that controller generates, otherwise reduce the PWM driving signal frequency that controller generates.
Claims (2)
1. a non-isolation type multipath LED drive circuit for automatic current equalizing, is characterized in that comprising drive circuit, LED circuit, and the output of drive circuit is connected with the input of LED circuit;
Described drive circuit comprises DC power supply Vc, controller, the first power switch pipe Q1, the second power switch pipe Q2, resonant inductance Lr; The positive pole of DC power supply Vc is connected with the source electrode of the first power switch pipe Q1, the negative pole of DC power supply Vc is connected with the drain electrode of the second power switch pipe Q2, controller is controlled the on off state of the first power switch pipe Q1 and the second power switch pipe Q2, and the drain electrode of the first power switch pipe Q1 is connected with the source electrode of the second power switch pipe Q2 and is connected in series with resonant inductance Lr;
LED circuit includes a paths of LEDs subcircuits or LED subcircuits some and that connect, and LED subcircuits includes first and stops capacitor C b1, the first diode D1, the second diode D2, the first storage capacitor C1, the first light-emitting diodes pipe string LED1; First stops that capacitor C b1 is connected with resonant inductance Lr, first stops that capacitor C b1 joins with the positive pole of the first diode D1 and the negative pole of the second diode D2 respectively, the negative pole of the first diode D1 joins with the first storage capacitor C1 positive pole and the first light-emitting diodes pipe string LED1 negative pole, the minus earth of the negative pole of the second diode D2 and the first storage capacitor C1, is connected a current sense resistor Rm between the negative pole of light-emitting diodes pipe string negative pole and DC power supply Vc;
Or
Described drive circuit comprises DC power supply Vc, controller, the first power switch pipe Q1, the second power switch pipe Q2, resonant inductance Lr; The positive pole of DC power supply Vc is connected with the source electrode of the first power switch pipe Q1, the negative pole of DC power supply Vc is connected with the drain electrode of the second power switch pipe Q2, controller is controlled the on off state of the first power switch pipe Q1 and the second power switch pipe Q2, and the drain electrode of the first power switch pipe Q1 is connected with the source electrode of the second power switch pipe Q2 and is connected in series with resonant inductance Lr;
LED circuit includes a paths of LEDs subcircuits or LED subcircuits some and that connect, and LED subcircuits includes first and stops capacitor C b1 and the AC equivalent resistance of connecting with it
; AC equivalent resistance
for:
, wherein: M is the LED lamp pearl number on LED branch road,
for the equivalent resistance of LED lamp pearl, first stops that one end of capacitor C b1 is connected with resonant inductance Lr, and first stops the other end and the AC equivalent resistance of capacitor C b1
connect.
2. the non-isolation type multipath LED drive circuit of automatic current equalizing according to claim 1, it is characterized in that first in described each LED subcircuits stops that each component parameters of capacitor C b1, the first diode D1, the second diode D2, the first storage capacitor C1, the first light-emitting diodes pipe string LED1 is mutually the same, or first in each LED subcircuits stops that at least arbitrary component parameters of capacitor C b1, the first diode D1, the second diode D2, the first storage capacitor C1, the first light-emitting diodes pipe string LED1 is not identical.
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|---|---|---|---|
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| CN105491724B (en) * | 2015-12-31 | 2017-10-20 | 华南理工大学 | Based on the Dimmable LED drive circuit for flowing gate-controlled switch Capacity control |
| CN106535393B (en) * | 2016-10-26 | 2018-05-15 | 广东工业大学 | A kind of mode of resonance LED flow equalizing circuit control methods |
| CN113709941B (en) * | 2021-09-09 | 2024-03-08 | 深圳市优仕拓科技有限公司 | Circuit of non-isolated multichannel intelligent power supply of high PF value |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201918900U (en) * | 2010-06-18 | 2011-08-03 | 阳菊村 | Driving power source used for LED (light-emitting diode) fluorescent lamp |
| CN202335004U (en) * | 2011-11-16 | 2012-07-11 | 广东工业大学 | Automatic current-equalizing non-isolation multi-circuit light emitting diode (LED) drive circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201918900U (en) * | 2010-06-18 | 2011-08-03 | 阳菊村 | Driving power source used for LED (light-emitting diode) fluorescent lamp |
| CN202335004U (en) * | 2011-11-16 | 2012-07-11 | 广东工业大学 | Automatic current-equalizing non-isolation multi-circuit light emitting diode (LED) drive circuit |
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