CN103702495B - A kind of linear LED drive circuit based on AC-powered - Google Patents
A kind of linear LED drive circuit based on AC-powered Download PDFInfo
- Publication number
- CN103702495B CN103702495B CN201410024201.5A CN201410024201A CN103702495B CN 103702495 B CN103702495 B CN 103702495B CN 201410024201 A CN201410024201 A CN 201410024201A CN 103702495 B CN103702495 B CN 103702495B
- Authority
- CN
- China
- Prior art keywords
- comparator
- led
- output
- circuit
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention relates to electronic circuit technology, relate to a kind of linear LED drive circuit based on AC-powered specifically.Linear LED drive circuit of the present invention, comprises rectifier circuit and multiple LED module, it is characterized in that, also comprises sample circuit, logic control circuit and multiple constant flow module; Described rectifier circuit is connected with sample circuit, LED module and constant flow module, described sample circuit andlogic control circuit connects, described logic control circuit is connected with each constant flow module respectively, and described constant flow module is equal with LED module quantity and be corresponding in turn to and be connected.Beneficial effect of the present invention is, effectively can improve electric energy conversion efficiency, realizes LED current constant current and LED average power is constant, also according to demand, can regulate LED number, setting LED lamp power.The present invention is particularly useful for linear LED and drives.
Description
Technical field
The present invention relates to electronic circuit technology, relate to a kind of linear LED drive circuit based on AC-powered specifically.
Background technology
At present, in LED drive circuit design field, the type of drive of LED comprises Linear Driving and Switching Power Supply drives.Switching Power Supply drives as traditional type of drive, and its shortcoming is more, and linear drive mode has structure simply by contrast, the advantages such as electromagnetic interference EMI is little, but also there is the problems such as efficiency is low, modulability is poor simultaneously.When only having a LED branch road, when Alternating Current Power Supply because voltage change range causes more greatly efficiency lower.Therefore, adopt the mode of multiple branch circuit LED strip connection, according to the change of supply power voltage, the LED of different number is connected with electric power system, thus raises the efficiency.Adopt the mode also existing defects of multiple branch circuit LED strip connection, LED lamp bead number changes along with the change of supply power voltage, thus the average canbdle power of LED can be caused to change, and light fixture light and shade changes, and will affect one's power of vision health for a long time.
Summary of the invention
To be solved by this invention, be exactly for the above-mentioned LED Problems existing based on AC-powered, propose a kind of linear LED drive circuit based on AC-powered.
As shown in Figure 1, the present invention solves the problems of the technologies described above adopted technical scheme: a kind of linear LED drive circuit based on AC-powered, comprise rectifier circuit and multiple LED module, it is characterized in that, also comprise sample circuit, logic control circuit and multiple constant flow module; Described rectifier circuit is connected with sample circuit, LED module and constant flow module, described sample circuit andlogic control circuit connects, described logic control circuit is connected with each constant flow module respectively, and described constant flow module is equal with LED module quantity and be corresponding in turn to and be connected; Wherein,
Rectifier circuit for receiving alternating current, and for sample circuit, LED module and constant flow module after AC rectification being become direct current;
Sample circuit is used for sampling to the electric current exported after rectifier circuit rectification, and sampled current signals is sent to logic control circuit;
Logic control circuit, according to sampled current signals, exports control signal and controls constant flow module;
Constant flow module, according to the signal of logic control circuit, regulates the electric current of LED module, makes the constant current hold of LED module.
As shown in Figure 2, described constant flow module comprises reference voltage unit, LED current sampling unit, operational amplifier and Correctional tube; Described LED current sampling unit is connected with LED module, the input of described reference voltage unit and LED current sampling unit concatenation operation amplifier, and the output of operational amplifier connects Correctional tube, and described Correctional tube connects LED module; Wherein,
Reference voltage unit for generation of constant reference voltage, and is input to an input of operational amplifier;
LED current sampling unit for gathering the electric current of LED module, and in the form of voltage feed back input to another input of operational amplifier;
Operational amplifier is for receiving reference voltage and sampled voltage, and output voltage control signal is to Correctional tube;
Correctional tube, according to the electric current of the control signal adjustment LED module of operational amplifier, keeps the current constant of LED module.
As shown in Figure 3, described sample circuit is resistor voltage divider circuit, comprises the first resistance R1 and the second resistance R2 that are connected, one end of first resistance R1 connects an output of rectifier circuit, one end of second resistance R2 connects another output end of rectifier circuit, and the link of the first resistance R1 and the second resistance R2 is connected as the output andlogic control circuit of sample circuit, as shown in Figure 4, described logic control circuit comprises the first comparator, second comparator, 3rd comparator, 4th comparator, first not gate, second not gate, 3rd not gate, first and door, second with door and the 3rd and door, the output of sample circuit respectively with the first comparator, second comparator, 3rd comparator is connected with the positive input of the 4th comparator, the first comparator, second comparator, 3rd comparator is connected reference voltage respectively with the reverse input end of the 4th comparator, and the output of the first comparator connects an input of first and door, the input of the second comparator connects the input and second and an input of door of the first not gate, the output of the first not gate connects another input of first and door, the output of the 3rd comparator connect the second not gate input and the 3rd with an input of door, the output of the second not gate connects another input of second and door, the output of the 4th comparator connects the input of the 3rd not gate, the output of the 3rd not gate connect the 3rd with another input of door, first with the output of door, second with the output of door, 3rd signal exported with the output of door and the output of the 4th comparator forms the output signal of logic control circuit.
Concrete, described Correctional tube can be the devices such as transistor, metal-oxide-semiconductor, IGBT.
Concrete, described operational amplifier is all the operational amplifier of the low imbalance high-gain with Enable Pin.
Further, described comparator can be realized by operational amplifier.
Beneficial effect of the present invention is, effectively can improve electric energy conversion efficiency, realizes LED current constant current and LED average power is constant, also according to demand, can regulate LED number, setting LED lamp power.
Accompanying drawing explanation
Fig. 1 is the schematic block diagram of drive circuit of the present invention;
Fig. 2 is the another kind of schematic block diagram of drive circuit of the present invention;
Fig. 3 is the physical circuit schematic diagram of sample circuit of the present invention;
Fig. 4 is the physical circuit schematic diagram of sample circuit of the present invention and logic control circuit;
Fig. 5 is that sample circuit of the present invention compares output waveform with reference voltage;
Fig. 6 is logic control circuit output waveform of the present invention;
Fig. 7 is the physical circuit schematic diagram of the embodiment of the present invention 1;
Fig. 8 is the physical circuit schematic diagram of the embodiment of the present invention 2;
Fig. 9 is a kind of operation amplifier circuit principle schematic with Enable Pin of the present invention;
Figure 10 is constrained input waveform schematic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, describe technical scheme of the present invention in detail:
Drive circuit of the present invention, be mainly and gather rectifier bridge output current by sample circuit, judge whether rectifier bridge output current changes by logic control circuit, regulated in real time by the electric current of constant flow module to LED module when electric current changes, realize the constant of LED module electric current.
Fig. 3 is a kind of specific embodiment of the sample circuit that the present invention provides, and utilizes resistance pressure-dividing network to sample.
Fig. 4 gives a kind of specific embodiment that sample circuit of the present invention is connected with logical circuit, and sampled voltage is input to the in-phase end of comparator, the reference voltage that the end of oppisite phase input of comparator sets.Accompanying drawing 5 are sampled voltages with reference voltage compare waveform and output waveform.
Fig. 6 is the output waveform of logical circuit.Logical circuit exports receives the Enable Pin of operational amplifier in constant-current network, and described operational amplifier Enable Pin high level is effective, is used for controlling the open and close of constant-current network.
Embodiment 1:
As shown in Figure 7, in this example, LED module comprises 4 LED branch roads, and every bar LED branch road comprises 3 LED lamp bead, and comparator all adopts operational amplifier, and concrete operation principle is:
AC sine wave AC, through rectifier bridge rectification, becomes direct current.When voltage is zero, 4 LED modules do not have electric current, and the electric current flowing through sampling resistor Rs is zero, and the voltage on sampling resistor is zero, and the voltage feeding back to the negative input end of 4 operational amplifiers is zero.The division module that sample circuit is arranged, sampled voltage is 0, M1, M2, M3, M4 export and be low level.M1, M2, M3, M4 receive the Enable Pin of branch road one to the operational amplifier of branch road four respectively, and the output forcing operational amplifier is low level, 4 metal-oxide-semiconductor M1M2 ... M4 is in cut-off state.Duration is
t0=acsin(V1/Vmax)/(2*pi*f)
V1 is the voltage of 3 diode current flows making first LED module, and Vmax is the direct voltage maximum after rectification, f=100Hz.
In voltage rise to V1 when can make the voltage of 3 diode current flows of first LED module, LED module 1 conducting, by setting VBIAS1.Make
VBIAS1<V1/(R1+R2)*R2<VBIAS2<VBIAS3<VBIAS4。
M1 exports as high level.M2, M3, M4 export as low level.M1 is the operational amplifier work of the first branch road, and the grid outputting to M1MOS pipe is high level, and constant flow module 1 is opened.The constant flow module on other roads is still closed.Input voltage continues to increase, and due to the clamped effect of amplifier, current constant is at I1=VREF1/Rs.Be VREF1/Rs by the electric current of LED module 1.Duration is
t1=acsin(V2/Vmax)/(2*pi*f)-to
V2 is the voltage of 6 diode current flows making first LED module and second LED module, and Vmax is the direct voltage maximum after rectification, f=100Hz.
When supply power voltage is greater than V2, by setting
VBIAS1<VBIAS2<V2/(R1+R2)*R2<VBIAS3<VBIAS4
M2 exports as high level, M1, M3, M4 output low level.Constant flow module 2 conducting, constant flow module 1, constant flow module 3, constant flow module 4 are closed.Be I2=VREF2/Rs by the electric current of LED module 1, LED module 2.Supply power voltage continues to increase,
Due to the clamped effect of amplifier, current constant is at VREF2/Rs.Duration
t2=acsin(V3/Vmax)/(2*pi*f)-t1-t0
V3 is the voltage of 9 diode current flows making first LED module, second LED module, the 3rd LED module, and Vmax is the direct voltage maximum after rectification, f=100Hz.
Supply power voltage continues to increase, when reaching V3, and setting
VBIAS1<VBIAS2<VBIAS3<V3/(R1+R2)*R2<VBIAS4
M3 exports high level.M1, M2, M4 output low level.Constant flow module 3 conducting, other constant flow modules are closed.Be I3=VREF3/Rs by the electric current of LED module 1, LED module 2, LED module 3.Supply power voltage continues to increase, and due to the clamped effect of amplifier, current constant is at VREF3/Rs.Duration
t3=acsin(V3/Vmax)/(2*pi*f)-t1-t0-t2。
When supply power voltage is greater than V4, setting
VBIAS1<VBIAS2<VBIAS3<VBIAS4<V4/(R1+R2)*R2
V4 is the voltage of 12 diode current flows making first LED module, second LED module, the 3rd LED module, the 4th LED module, and Vmax is the direct voltage maximum after rectification, f=100Hz.
M4 exports high level, M1, M2, M3 output low level.Constant flow module 4 conducting, other constant flow modules are closed.By the electric current I 4=VREF4/Rs of LED module 1, LED module 2, LED module 3, LED module 4.Supply power voltage continues to increase, and due to the clamped effect of amplifier, current constant is at VREF4/Rs.Duration
t4=T-t0-t1-t2-t3
Divide the electric work W1=V1*I1*t1 of time phase, W2=V2*I2*t2, W3=V3*I3*t3.W4=V4*I4*t4.W1=W2=W3=W4 is set.Just can ensure the brightness constancy of LED luminescence.Regulate electric current by the value setting VREF1, VREF2, VREF3, VREF4, realize LED luminosity constant.
Embodiment 2:
As shown in Figure 8, this routine basic structure is identical with embodiment 1 with principle, and the reference voltage unlike the input of this example setting operational amplifier in-phase end is equal, utilizes the clamped effect of amplifier, ensures LED lamp bead constant current.
As shown in Figure 9, be the operational amplifier of a kind of low imbalance high-gain with Enable Pin in the present invention, the use of comparator can be used as.
As shown in Figure 10, be the oscillogram of waveform and comparative voltage after rectification in the present invention.
Claims (1)
1. based on a linear LED drive circuit for AC-powered, comprise rectifier circuit and multiple LED module, it is characterized in that, also comprise sample circuit, logic control circuit and multiple constant flow module; Described rectifier circuit is connected with sample circuit, LED module and constant flow module, described sample circuit andlogic control circuit connects, described logic control circuit is connected with each constant flow module respectively, and described constant flow module is equal with LED module quantity and be corresponding in turn to and be connected; Wherein,
Rectifier circuit for receiving alternating current, and for sample circuit, LED module and constant flow module after AC rectification being become direct current;
Sample circuit is used for sampling to the electric current exported after rectifier circuit rectification, and sampled current signals is sent to logic control circuit;
Logic control circuit, according to sampled current signals, exports control signal and controls constant flow module;
Constant flow module, according to the signal of logic control circuit, regulates the electric current of LED module, makes the constant current hold of LED module;
Described constant flow module comprises reference voltage unit, LED current sampling unit, operational amplifier and Correctional tube; Described LED current sampling unit is connected with LED module, the input of described reference voltage unit and LED current sampling unit concatenation operation amplifier, and the output of operational amplifier connects Correctional tube, and described Correctional tube connects LED module; Wherein,
Reference voltage unit for generation of constant reference voltage, and is input to an input of operational amplifier;
LED current sampling unit for gathering the electric current of LED module, and in the form of voltage feed back input to another input of operational amplifier;
Operational amplifier is for receiving reference voltage and sampled voltage, and output voltage control signal is to Correctional tube;
Correctional tube, according to the electric current of the control signal adjustment LED module of operational amplifier, keeps the current constant of LED module;
Described sample circuit is resistor voltage divider circuit, comprises the first resistance R1 and the second resistance R2 that are connected, one end of first resistance R1 connects an output of rectifier circuit, and one end of the second resistance R2 connects another output of rectifier circuit, and the link of the first resistance R1 and the second resistance R2 is connected as the output andlogic control circuit of sample circuit, described logic control circuit comprises the first comparator, second comparator, 3rd comparator, 4th comparator, first not gate, second not gate, 3rd not gate, first and door, second with door and the 3rd and door, the output of sample circuit respectively with the first comparator, second comparator, 3rd comparator is connected with the positive input of the 4th comparator, the first comparator, second comparator, 3rd comparator is connected reference voltage respectively with the reverse input end of the 4th comparator, and the output of the first comparator connects an input of first and door, the input of the second comparator connects the input and second and an input of door of the first not gate, the output of the first not gate connects another input of first and door, the output of the 3rd comparator connect the second not gate input and the 3rd with an input of door, the output of the second not gate connects another input of second and door, the output of the 4th comparator connects the input of the 3rd not gate, the output of the 3rd not gate connect the 3rd with another input of door, first with the output of door, second with the output of door, 3rd signal exported with the output of door and the output of the 4th comparator forms the output signal of logic control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410024201.5A CN103702495B (en) | 2014-01-20 | 2014-01-20 | A kind of linear LED drive circuit based on AC-powered |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410024201.5A CN103702495B (en) | 2014-01-20 | 2014-01-20 | A kind of linear LED drive circuit based on AC-powered |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103702495A CN103702495A (en) | 2014-04-02 |
| CN103702495B true CN103702495B (en) | 2015-08-19 |
Family
ID=50363863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410024201.5A Expired - Fee Related CN103702495B (en) | 2014-01-20 | 2014-01-20 | A kind of linear LED drive circuit based on AC-powered |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103702495B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105991111B (en) * | 2015-03-02 | 2019-05-28 | 华为技术有限公司 | A kind of time series forecasting circuit and method |
| CN108258745B (en) * | 2016-12-29 | 2021-07-16 | 上海岭芯微电子有限公司 | Chip with high-current switch type charging and power management functions and application |
| CN110798943B (en) * | 2019-12-03 | 2023-08-15 | 珠海格力电器股份有限公司 | Current control circuit, method and driving system for realizing phase interleaving |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101616524A (en) * | 2009-07-29 | 2009-12-30 | 广州复旦奥特科技股份有限公司 | A kind of commercial LED illumination driver |
| CN103152951A (en) * | 2013-03-13 | 2013-06-12 | 绍兴光大芯业微电子有限公司 | LED (light emitting diode) driving control circuit and driving circuit structure of LED driving control circuit |
-
2014
- 2014-01-20 CN CN201410024201.5A patent/CN103702495B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101616524A (en) * | 2009-07-29 | 2009-12-30 | 广州复旦奥特科技股份有限公司 | A kind of commercial LED illumination driver |
| CN103152951A (en) * | 2013-03-13 | 2013-06-12 | 绍兴光大芯业微电子有限公司 | LED (light emitting diode) driving control circuit and driving circuit structure of LED driving control circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103702495A (en) | 2014-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103648219B (en) | Light-emitting diode (LED) switch constant-current driving circuit | |
| CN103052227B (en) | Led driving system | |
| US9101014B2 (en) | LED controlling circuit with high power factor and an LED lighting device | |
| CN106455227B (en) | A kind of LED linear constant-current control circuit and LED light emission device | |
| CN102387628B (en) | LED (Light-Emitting Diode) dimming control circuit | |
| CN102612235B (en) | Light-emitting diode (LED) illuminating device comprising multistage constant current drive circuit | |
| CN103561509B (en) | Switching tube separated LED driving circuit structure | |
| CN104333934A (en) | LED illumination driving circuit | |
| CN104768296A (en) | LED dimming driving circuit | |
| CN103957648B (en) | Controllable silicon, simulation, PWM light modulation universal circuit and LED drive chip | |
| CN103702495B (en) | A kind of linear LED drive circuit based on AC-powered | |
| CN103561503B (en) | LED drive power supply suitable for AC phase-cut dimming | |
| CN104780646A (en) | LED driving circuit supporting controllable silicon diming | |
| CN205726501U (en) | A kind of LED adjusting control circuit | |
| CN202759647U (en) | LED control circuit having high power factor and LED lighting device | |
| CN102740540A (en) | Light emitting diode driving system | |
| CN101813260B (en) | LED lamp device and PWM (Pulse Width Modulation) direct current supply control circuit | |
| CN203492241U (en) | Novel LED dimming module | |
| CN107046747B (en) | A kind of LED light adjusting control circuit | |
| CN202551455U (en) | LED (Light-Emitting Diode) constant-current driving power supply | |
| CN204730000U (en) | A kind of color-adjustable LED lamp bar system | |
| CN202103911U (en) | Constant-current control circuit suitable for multi-way LED lamp | |
| CN102291885A (en) | Constant-current control circuit suitable for multipath LED (Light Emitting Diode) lamps | |
| CN103582234A (en) | Light source dimming control circuit | |
| CN104080226B (en) | A kind of circuit controlling triode switch according to sample rate current |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150819 Termination date: 20160120 |
|
| EXPY | Termination of patent right or utility model |