CN104270874A - Sectional type LED driving circuit - Google Patents
Sectional type LED driving circuit Download PDFInfo
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- CN104270874A CN104270874A CN201410584436.XA CN201410584436A CN104270874A CN 104270874 A CN104270874 A CN 104270874A CN 201410584436 A CN201410584436 A CN 201410584436A CN 104270874 A CN104270874 A CN 104270874A
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Abstract
The invention relates to a sectional type LED (Light Emitting Diode) driving circuit. The sectional type LED driving circuit comprises an LED module, a power tube module, a power factor adjusting module and a reference source module, wherein the LED module comprises a plurality of LED light strings connected from end to end; the power tube module comprises a plurality of power tubes with the number corresponding to that of the LED light strings, and each power tube is corresponding to one LED light string; the power factor adjusting module comprises a plurality of voltage comparing elements with the number corresponding to that of the power tubes, and each voltage comparing element is corresponding to one power tube; the reference source module comprises a plurality of voltage output ends with the number corresponding to that of the voltage comparing elements and a reference signal output end. The sectional type LED driving circuit further comprises a constant current compensation module. According to the invention, switches are used for sectional connectivity, and LED driving current is enabled to vary with alternating current input voltage, so that the higher power factor can be obtained; in addition, the constant current compensation module is adopted, so that the higher linear adjustment rate can be obtained, the structure is simple, and the application range is wide.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to circuit, specifically refer to a kind of segmented LED drive circuit.
Background technology
Common high power factor circuit is generally that Switching Power Supply class circuit is at the inner integrated power factor correcting circuit of controller, circuit more complicated, drive relative to switch power supply type, linear constant current formula drives the EMI problem caused without HF switch, without the need to electrochemical capacitor, without the need to inductance and transformer, peripheral circuit is simple, and volume is less, and cost is cheaper, but the linear constant current drive circuit line regulation of prior art is lower, and reactive factor correcting circuit.
Refer to shown in Fig. 1, be LED drive circuit of the prior art, VIN is AC-input voltage V
aCby the half-wave voltage signal after rectification, VIN>V
tHtime, the electric current that power tube flows through increases gradually, eventually through amplifier, R
cSwith power tube composition feedback control loop by current stabilization, I
lED=VREF/R
cS.
Refer to shown in Fig. 2, be the oscillogram of the LED drive circuit of prior art, wherein the LED drive circuit of prior art has following a few point defect:
(1) in wide range input voltage, Current compliance is poor, as input exchange signal V
aCwhen changing, in a half wave cycles, the time of current constant can change, and works as VIN1>VIN2, and the time T1 that in one-period, VIN1 is greater than VTH is greater than the time T2 output current I that VIN2 is greater than VTH
aV1>I
aV2.
(2) when LED number one timing, just can be lighted, so the utilance of LED is very low when VIN is higher simultaneously, if reduce LED quantity, although can utilance be increased, the power consumption of line circuit can be made greatly to increase, thus reduce the whole work efficiency of whole LED drive scheme.
(3) low PF (power factor) value and THD (total harmonic distortion).
Summary of the invention
The object of the invention is the shortcoming overcoming above-mentioned prior art, provide and a kind ofly can realize improving the power factor of LED drive circuit, the line regulation improving LED drive circuit, the segmented LED drive circuit that has wide range of applications.
To achieve these goals, segmented LED drive circuit of the present invention has following formation:
This segmented LED drive circuit, its main feature is, described circuit comprises:
LED module, comprising the LED string that string is end to end;
Power tube module, comprising several power tubes that the string LED string with described is quantitatively corresponding, and each power tube only corresponding a string LED string;
Power factor adjusting module, comprising the several voltage comparison units quantitatively corresponding with described several power tubes, and each voltage comparison unit only corresponding power tube;
A reference source module, comprising the several voltage output end quantitatively corresponding with described voltage comparison unit and a reference signal output;
The input of rectification filtering module is connected with power supply, the output of described rectification filtering module is connected with the input of described LED module, the reverse input end of each LED is connected with the first end of the power tube corresponded, each power tube is connected with the voltage comparison unit corresponded, and each voltage comparison unit is connected with the voltage output end of a reference source module corresponded.
Further, described each voltage comparison unit comprises the switch that operational amplifier and the second end are connected with the output of described operational amplifier, the voltage output end of described a reference source module is connected with the positive input of the operational amplifier in the voltage comparison unit corresponded respectively, the reverse input end of described each operational amplifier, the 3rd end of described each switch and sampling resistor (R
s) first end be connected, the 3rd end of each power tube is connected with the first end of the switch in the voltage comparison unit corresponded, and the second end of described each power tube is connected with internal electric source, described sampling resistor (R
s) the second end be connected to the ground and connect.
Further, described switch is triode or field effect transistor.
Further, described circuit also comprises constant current compensating module, and described constant current compensating module comprises error amplifying unit, current mirror unit and the first resistance (R
1); Described error amplifying unit comprises comparator/operational amplifier (EA), the first electric capacity (C
1) and signal amplification component; The first described resistance (R
1) first end, the output of described current mirror unit and described each voltage comparison unit in the reverse input end of operational amplifier be connected, the first described resistance (R
1) the second end be connected with the 3rd end of described each switch, the positive input of described comparator/operational amplifier (EA) and described sampling resistor (R
s) first end be connected, the reverse input end of described comparator/operational amplifier (EA) is connected with the reference signal output of described a reference source module, the output of described comparator/operational amplifier (EA), the first electric capacity (C
1) first end and the second end of signal amplification component be connected, the first described electric capacity (C
1) the second end and the first end of signal amplification component be connected to the ground and connect, the 3rd end of described signal amplification component is connected with the input of current mirror unit.
Again further, described signal amplification component is transistor amplifier or field effect transistor amplification circuit.
Further, described circuit also comprises constant current compensating module, and described constant current compensating module comprises current subtraction unit, V-I converting unit, voltage sampling unit and the first resistance (R
1), described voltage sampling unit comprises the second resistance (R
2), the 3rd resistance (R
3) and the second electric capacity (C
2), the first described resistance (R
1) first end, the output of described current subtraction unit and described each voltage comparison unit in the reverse input end of operational amplifier be connected, the first described resistance (R
1) the second end be connected with the 3rd end of described each switch, the second described resistance (R
2) first end be connected with the output of described rectification filtering module, the second described resistance (R
2) the second end, the 3rd resistance (R
3) first end, the second electric capacity (C
2) first end, V-I converting unit input be connected, the second described electric capacity (C
2) the second end and the 3rd resistance (R
3) the second end be connected to the ground and connect, the output of described V-I converting unit is connected with the first input end of described current subtraction unit, and the second input of described current subtraction unit is connected with the reference signal output of described a reference source module.
Further, described power tube is HF switch.
Further, described LED string comprises several LED.
Have employed the segmented LED drive circuit in this invention, compared with prior art, there is following beneficial effect:
Segmented LED drive circuit of the present invention, the electric current that LED is flow through in the rising along with VIN raises step by step, makes this circuit have higher PF value and THD; Segmented LED drive circuit of the present invention, regulates final V by feedback loop
smean value infinitely approach VREF, when inputting for different VIN, by such negative-feedback regu-lation, output current mean value can not increase with the increase of VIN, but a fixed value VREF/R
s, improve line regulation; Segmented LED drive circuit of the present invention, structure is simple, easy to use, has wide range of applications.
Accompanying drawing explanation
Fig. 1 is the LED drive circuit of prior art.
Fig. 2 is the oscillogram of the LED drive circuit of prior art.
Fig. 3 is the first electrical block diagram of segmented LED drive circuit of the present invention.
Fig. 4 is the second electrical block diagram of segmented LED drive circuit of the present invention.
Embodiment
In order to more clearly describe technology contents of the present invention, conduct further description below in conjunction with specific embodiment.
Refer to shown in Fig. 3 to Fig. 4, segmented LED drive circuit of the present invention comprises:
LED module, comprising the LED string that string is end to end;
Power tube module, comprising several power tubes that the string LED string with described is quantitatively corresponding, and each power tube only corresponding a string LED string;
Power factor adjusting module, comprising the several voltage comparison units quantitatively corresponding with described several power tubes, and each voltage comparison unit only corresponding power tube;
A reference source module, comprising the several voltage output end quantitatively corresponding with described voltage comparison unit and a reference signal output;
The input of rectification filtering module is connected with power supply, the output of described rectification filtering module is connected with the input of described LED module, the reverse input end of each LED is connected with the first end of the power tube corresponded, each power tube is connected with the voltage comparison unit corresponded, and each voltage comparison unit is connected with the voltage output end of a reference source module corresponded.
Described each voltage comparison unit comprises the switch that operational amplifier and the second end are connected with the output of described operational amplifier, the voltage output end of described a reference source module is connected with the positive input of the operational amplifier in the voltage comparison unit corresponded respectively, the reverse input end of described each operational amplifier, the 3rd end of described each switch and sampling resistor (R
s) first end be connected, the 3rd end of each power tube is connected with the first end of the switch in the voltage comparison unit corresponded, and the second end of described each power tube is connected with internal electric source, described sampling resistor (R
s) the second end be connected to the ground and connect.
Described switch is triode or field effect transistor.
By above-mentioned switch-segment conducting, LED drive current is changed with AC-input voltage, thus obtain higher power factor.Generally, the electric current that LED is flow through in the rising along with VIN raises step by step, makes this circuit have higher PF value and THD.
In order to realize above-mentioned technique effect, a crucial place of the present invention is: V
1<V
2< ... <Vn; Like this along with the rising of AC-input voltage, LED module conducting LED number increases gradually, and drive current raises step by step.
Refer to shown in Fig. 3, be the first electrical block diagram of segmented LED drive circuit of the present invention, described circuit also comprises constant current compensating module, and described constant current compensating module comprises error amplifying unit, current mirror unit and the first resistance (R
1); Described error amplifying unit comprises comparator/operational amplifier (EA), the first electric capacity (C
1) and signal amplification component; The first described resistance (R
1) first end, the output of described current mirror unit and described each voltage comparison unit in the reverse input end of operational amplifier be connected, the first described resistance (R
1) the second end be connected with the 3rd end of described each switch, the positive input of described comparator/operational amplifier (EA) and described sampling resistor (R
s) first end be connected, the reverse input end of described comparator/operational amplifier (EA) is connected with the reference signal output of described a reference source module, the output of described comparator/operational amplifier (EA), the first electric capacity (C
1) first end and the second end of signal amplification component be connected, the first described electric capacity (C
1) the second end and the first end of signal amplification component be connected to the ground and connect, the 3rd end of described signal amplification component is connected with the input of current mirror unit.
Described signal amplification component is transistor amplifier or field effect transistor amplification circuit.
The operation principle of this circuit is:
VIN is AC-input voltage V
aCby the half-wave voltage signal after rectification, LED module is in series by n LED group, it is luminous that power tube is used for driving LED lamp group, and power factor adjusting module can detect the switch of the size control LED power tube of input voltage automatically, and stablizes every section of output current by constant current compensating module.A reference source module produces n+1 fiducial value, is input to the input of voltage comparison unit respectively.
VIN is a half-wave voltage signal, when VIN is elevated to and enough makes LED1, M1, Q1 path have an electric current, and I
lED1=V
1/ R
s, along with the increase of VIN, LED2, M2, Q2 path also has electric current, V
s>V
1, Q1 is turned off, now I
lED1+LED2=V
2/ R
s, so analogize, after VIN is greater than certain value, LEDn, Mn, Qn path flows through electric current, V
s>V
n-1, Q
n-1be turned off, only last road conducting surplus, I
lED1+LED2 ... + LEDn=V
n/ R
s.
Resistance R
ssampling is carried out to the electric current flowing through LED module and is converted into voltage V
s, V
efor sampled voltage V
swith the integrated signal of the error amplification signal of VREF, this signal is a dynamic value, along with R
supper curent change and changing, V
smean value be greater than VREF, V
ecan increase, pass through N
1, P
1, P
2the electric current produced increases, R
1on pressure drop increase can reduce to flow through R
selectric current, V
smean value be less than VREF, V
ecan reduce, pass through N
1, P
1, P
2the electric current produced reduces, R
1on pressure drop reduction can increase and flow through R
selectric current, such feedback makes system stability after multiple work period, V
ebe stabilized in a fixed value, V
smean value is infinitely close to VREF.
Refer to shown in Fig. 4, for the second electrical block diagram of segmented LED drive circuit of the present invention, described circuit also comprises constant current compensating module, and described constant current compensating module comprises current subtraction unit, V-I converting unit, voltage sampling unit and the first resistance (R
1), described voltage sampling unit comprises the second resistance (R
2), the 3rd resistance (R
3) and the second electric capacity (C
2), the first described resistance (R
1) first end, the output of described current subtraction unit and described each voltage comparison unit in the reverse input end of operational amplifier be connected, the first described resistance (R
1) the second end be connected with the 3rd end of described each switch, the second described resistance (R
2) first end be connected with the output of described rectification filtering module, the second described resistance (R
2) the second end, the 3rd resistance (R
3) first end, the second electric capacity (C
2) first end, V-I converting unit input be connected, the second described electric capacity (C
2) the second end and the 3rd resistance (R
3) the second end be connected to the ground and connect, the output of described V-I converting unit is connected with the first input end of described current subtraction unit, and the second input of described current subtraction unit is connected with the reference signal output of described a reference source module.
The operation principle of this circuit is:
R
2and R
3to VIN sampling, and by electric capacity C
2integration, this integral voltage is converted into an electric current I 1 by V-I conversion circuit, and this electric current I 1 deducts a reference current IREF and flows through R
1.VIN increases, C
2integral voltage increases, and I1 increases, R
1upper pressure drop increases, R during LED conducting
son electric current reduce, sampling resistor R
sarrange and need meet different input voltage R within multiple cycle
son average current equal.
Above two kinds of circuit structures are all obtain higher line regulation by line voltage compensation, regulate final V by feedback loop
smean value infinitely approach VREF, when inputting for different VIN, by such negative-feedback regu-lation, output current mean value can not increase with the increase of VIN, but a fixed value VREF/R
s,
In addition, described power tube is HF switch.
Described LED string comprises several LED, wherein, the connected mode of the LED in described LED string can be series, parallel or series-parallel connection, and in described LED string, the number of LED is not unalterable, can be set as required by user.
Have employed the segmented LED drive circuit in this invention, compared with prior art, there is following beneficial effect:
Segmented LED drive circuit of the present invention, the electric current that LED is flow through in the rising along with VIN raises step by step, makes this circuit have higher PF value and THD; Segmented LED drive circuit of the present invention, regulates final V by feedback loop
smean value infinitely approach VREF, when inputting for different VIN, by such negative-feedback regu-lation, output current mean value can not increase with the increase of VIN, but a fixed value VREF/R
s, improve line regulation; Segmented LED drive circuit of the present invention, structure is simple, easy to use, has wide range of applications.
In this description, the present invention is described with reference to its specific embodiment.But, still can make various amendment and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (8)
1. a segmented LED drive circuit, is characterized in that, described circuit comprises:
LED module, comprising the LED string that string is end to end;
Power tube module, comprising several power tubes that the string LED string with described is quantitatively corresponding, and each power tube only corresponding a string LED string;
Power factor adjusting module, comprising the several voltage comparison units quantitatively corresponding with described several power tubes, and each voltage comparison unit only corresponding power tube;
A reference source module, comprising the several voltage output end quantitatively corresponding with described voltage comparison unit and a reference signal output;
The input of rectification filtering module is connected with power supply, the output of described rectification filtering module is connected with the input of described LED module, the reverse input end of each LED is connected with the first end of the power tube corresponded, each power tube is connected with the voltage comparison unit corresponded, and each voltage comparison unit is connected with the voltage output end of a reference source module corresponded.
2. segmented LED drive circuit according to claim 1, it is characterized in that, described each voltage comparison unit comprises the switch that operational amplifier and the second end are connected with the output of described operational amplifier, the voltage output end of described a reference source module is connected with the positive input of the operational amplifier in the voltage comparison unit corresponded respectively, the reverse input end of described each operational amplifier, the 3rd end of described each switch and sampling resistor (R
s) first end be connected, the 3rd end of each power tube is connected with the first end of the switch in the voltage comparison unit corresponded, and the second end of described each power tube is connected with internal electric source, described sampling resistor (R
s) the second end be connected to the ground and connect.
3. segmented LED drive circuit according to claim 2, is characterized in that, described switch is triode or field effect transistor.
4. segmented LED drive circuit according to claim 2, is characterized in that, described circuit also comprises constant current compensating module, and described constant current compensating module comprises error amplifying unit, current mirror unit and the first resistance (R
1); Described error amplifying unit comprises comparator/operational amplifier (EA), the first electric capacity (C
1) and signal amplification component; The first described resistance (R
1) first end, the output of described current mirror unit and described each voltage comparison unit in the reverse input end of operational amplifier be connected, the first described resistance (R
1) the second end be connected with the 3rd end of described each switch, the positive input of described comparator/operational amplifier (EA) and described sampling resistor (R
s) first end be connected, the reverse input end of described comparator/operational amplifier (EA) is connected with the reference signal output of described a reference source module, the output of described comparator/operational amplifier (EA), the first electric capacity (C
1) first end and the second end of signal amplification component be connected, the first described electric capacity (C
1) the second end and the first end of signal amplification component be connected to the ground and connect, the 3rd end of described signal amplification component is connected with the input of current mirror unit.
5. segmented LED drive circuit according to claim 4, is characterized in that, described signal amplification component is transistor amplifier or field effect transistor amplification circuit.
6. segmented LED drive circuit according to claim 2, is characterized in that, described circuit also comprises constant current compensating module, and described constant current compensating module comprises current subtraction unit, V-I converting unit, voltage sampling unit and the first resistance (R
1), described voltage sampling unit comprises the second resistance (R
2), the 3rd resistance (R
3) and the second electric capacity (C
2), the first described resistance (R
1) first end, the output of described current subtraction unit and described each voltage comparison unit in the reverse input end of operational amplifier be connected, the first described resistance (R
1) the second end be connected with the 3rd end of described each switch, the second described resistance (R
2) first end be connected with the output of described rectification filtering module, the second described resistance (R
2) the second end, the 3rd resistance (R
3) first end, the second electric capacity (C
2) first end, V-I converting unit input be connected, the second described electric capacity (C
2) the second end and the 3rd resistance (R
3) the second end be connected to the ground and connect, the output of described V-I converting unit is connected with the first input end of described current subtraction unit, and the second input of described current subtraction unit is connected with the reference signal output of described a reference source module.
7. segmented LED drive circuit according to claim 1, is characterized in that, described power tube is HF switch.
8. segmented LED drive circuit according to claim 1, is characterized in that, described LED string comprises several LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410584436.XA CN104270874B (en) | 2014-10-27 | 2014-10-27 | segmented LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410584436.XA CN104270874B (en) | 2014-10-27 | 2014-10-27 | segmented LED drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104270874A true CN104270874A (en) | 2015-01-07 |
| CN104270874B CN104270874B (en) | 2017-07-18 |
Family
ID=52162336
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|---|---|---|---|
| CN201410584436.XA Active CN104270874B (en) | 2014-10-27 | 2014-10-27 | segmented LED drive circuit |
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| CN106211461A (en) * | 2016-08-02 | 2016-12-07 | 惠勇 | A kind of stagewise LED drive circuit |
| CN106231738A (en) * | 2016-09-29 | 2016-12-14 | 华南理工大学 | The driving lighting circuit of a kind of stagewise AC LED and driving method thereof |
| CN107172769A (en) * | 2017-07-26 | 2017-09-15 | 无锡麟力科技有限公司 | Prevent electric backflash circuit under LED light device |
| CN107529244A (en) * | 2016-06-22 | 2017-12-29 | 华润矽威科技（上海）有限公司 | linear constant-power LED drive circuit and method |
| CN107567149A (en) * | 2017-10-09 | 2018-01-09 | 东莞市翔实信息科技有限公司 | Unmanned electric light driving constant-current circuit, integrated circuit and control system |
| CN108024417A (en) * | 2017-12-22 | 2018-05-11 | 泉芯电子技术(深圳)有限公司 | high-voltage linear segmented LED drive circuit |
| WO2018157480A1 (en) * | 2017-03-01 | 2018-09-07 | 深圳市稳先微电子有限公司 | Constant power linear sine led drive circuit and led drive apparatus |
| WO2019071999A1 (en) * | 2017-10-09 | 2019-04-18 | 蔡祥云 | Unmanned photoelectric soft driving constant-current circuit, integrated circuit and control system |
| TWI697257B (en) * | 2019-06-28 | 2020-06-21 | 聚積科技股份有限公司 | Compensating current correction device |
| CN111511074A (en) * | 2020-05-04 | 2020-08-07 | 陕西亚成微电子股份有限公司 | L ED driving circuit and control method |
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| CN107529244A (en) * | 2016-06-22 | 2017-12-29 | 华润矽威科技（上海）有限公司 | linear constant-power LED drive circuit and method |
| CN106211461B (en) * | 2016-08-02 | 2018-07-17 | 中山市旭普电子科技有限公司 | A kind of segmented LED drive circuit |
| CN106211461A (en) * | 2016-08-02 | 2016-12-07 | 惠勇 | A kind of stagewise LED drive circuit |
| CN106231738A (en) * | 2016-09-29 | 2016-12-14 | 华南理工大学 | The driving lighting circuit of a kind of stagewise AC LED and driving method thereof |
| CN106231738B (en) * | 2016-09-29 | 2018-09-14 | 华南理工大学 | A kind of the driving lighting circuit and its driving method of segmented AC LED |
| WO2018157480A1 (en) * | 2017-03-01 | 2018-09-07 | 深圳市稳先微电子有限公司 | Constant power linear sine led drive circuit and led drive apparatus |
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| CN107567149A (en) * | 2017-10-09 | 2018-01-09 | 东莞市翔实信息科技有限公司 | Unmanned electric light driving constant-current circuit, integrated circuit and control system |
| WO2019071999A1 (en) * | 2017-10-09 | 2019-04-18 | 蔡祥云 | Unmanned photoelectric soft driving constant-current circuit, integrated circuit and control system |
| WO2019071940A1 (en) * | 2017-10-09 | 2019-04-18 | 周彦漫 | Unmanned electro-optic drive constant current circuit, integrated circuit and control system |
| CN108024417A (en) * | 2017-12-22 | 2018-05-11 | 泉芯电子技术(深圳)有限公司 | high-voltage linear segmented LED drive circuit |
| CN108024417B (en) * | 2017-12-22 | 2024-01-16 | 泉芯电子技术(深圳)有限公司 | High-voltage linear sectional type LED driving circuit |
| TWI697257B (en) * | 2019-06-28 | 2020-06-21 | 聚積科技股份有限公司 | Compensating current correction device |
| CN111511074A (en) * | 2020-05-04 | 2020-08-07 | 陕西亚成微电子股份有限公司 | L ED driving circuit and control method |
| CN113811047A (en) * | 2021-10-18 | 2021-12-17 | 厦门阳光恩耐照明有限公司 | Multi-stage switch voltage reduction circuit, driving method thereof and LED lamp |
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