CN103108470B - Dynamic linear control light emitting diode (LED) driver circuit - Google Patents
Dynamic linear control light emitting diode (LED) driver circuit Download PDFInfo
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Abstract
The invention discloses a dynamic linear control light emitting diode (LED) driver circuit which comprises a rectifier module, a sampling module, a feedback module, a constant-current control module, a constant-current driver module. The rectifier module is used for converting input mains supply signals to linear driving voltage signals which are output to an LED load. The sampling module is used for acquiring driving current which flows through the LED load. The feedback module is used for acquiring the linear driving voltage signals. The constant-current control module is used for generating constant current adjusting signals according to the driving current and generating constant current control signals according to the linear driving voltage signals. The constant-current driver module is used for controlling current of the load to be constant current according to the constant current adjusting signals and the constant current control signals. According to the dynamic linear control LED driver circuit, a conducting mode and a non-conducting mode of a power switch can be chosen according to the magnitude of linear voltage of the LED load, and therefore the linear LED driving efficiency can be greatly improved. More specially, when input voltage is low and the LED load is in a high-working-efficiency mode, the constant-current control module enables the power switch to be in the conducting mode, and therefore a constant current output state of an LED is guaranteed; and when the input voltage is high and the LED load is in a low-working-efficiency mode, the constant-current control module enables the power switch to be shut down forcibly.
Description
Technical field
The present invention relates to LED to drive, particularly relate to a kind of dynamic linear and control LED drive circuit.
Background technology
Along with popularizing of green illumination, light-emitting diode (LED:Light Emitting Diode) illumination obtains development at full speed.LED drive power is all generally have employed Switching Power Supply to realize.Linear driving power, because the problem of efficiency, is all abandoned by engineers.Fig. 1 is the schematic diagram of traditional LED linear drive circuit, and as shown in Figure 1, rectifier bridge 110 is made up of 4 high-voltage diodes, and filter capacitor 101 is direct voltage city's signal of telecommunication (being generally sinusoidal alternating voltage) rectification.The supply module of control chip 105 comprises the decoupling capacitor 104 of divider resistance 102, clamp diode 103 and control chip, and supply module can separate the voltage of about 10V to driving chip work from the input voltage of about 300VDC.The major function of control chip 105 is drive currents of stable LED, and no matter how input voltage changes, or no matter how LED load 106 changes, and its drive current by LED is all invariable.
Wherein, LED load 106 is exactly the load LED lamp string of this driving, and it needs constant electric current to drive, and the size of electric current is determined by the kind of LED, and the LED drive current of general high brightness is 300mA.The driving switch 107 of driving power is generally power MOSFET.The resistance of the detection resistance 108 of drive current determines the size of drive current.
The principle of the Linear Driving power supply in Fig. 1 is: control chip is sampled the voltage of 54 Nodes, ensures that 54 Nodes are constant voltage, thus be steady state value: I_led=Vcs/Rcs by the drive current of LED by the voltage adjusting 53 Nodes; Wherein, I_led is the drive current by LED load 106, and Vcs is the voltage of control chip CS pin, i.e. the voltage at node 504 place.
The advantage of the circuit that this linear constant current drives is exactly that circuit is simple, and cost is low, and electromagnetic interference is low, but has a fatal weakness: efficiency is poor, longevity system.
Fig. 2 shows the oscillogram of the voltage at Fig. 1 interior joint 50,51,53 and 54 place, and as shown in Figure 2, node 50 place is the voltage Vac of city's signal of telecommunication of input, and the voltage range of city's signal of telecommunication in the whole world is 90VAC ~ 265VAC.Node 51 place is through filtered line voltage (being also referred to as linear voltage) Vline, and its size is
node 54 place is the reference voltage V cs determined by control chip 105, is generally the voltage of about 0.5V.Node 53 place is the driving voltage Vout of control chip 105.Efficiency eta=V_led × the I_led/ (V_led × I_led+I_led × Vd) of its work, V_led is the pressure drop of LED load 106, and I_led is the drive current of LED, and Vd is the voltage of power switch pipe 107 drain terminal, i.e. the voltage at node 52 place.Such as, can be 100V for output voltage, output current be the high-voltage LED scheme of the 5W of 50mA.
In practical application, the drive circuit in Fig. 1 in the efficiency of 90VAC up to 78%, but when the input voltage of 135VAC, efficiency only has 52%, if full voltage range work, when 265VAC, efficiency is low to moderate 30%, and system cannot work at all.Therefore, above-mentioned drive circuit can work reluctantly in the scope of univoltage (90Vac ~ 136Vac).But the loss of its poor efficiency is all concentrate on power switch pipe 107.The heat radiation of power switch pipe and life-span propose very high requirement to linear LED drive power.Therefore, a kind of linear constant current drive scheme solving efficiency and life-span is needed.
Summary of the invention
The technical problem to be solved in the present invention is the inefficient defect controlling LED drive circuit for prior art neutral line, provides a kind of dynamic linear to control LED drive circuit.
The technical solution adopted for the present invention to solve the technical problems is: the invention provides a kind of dynamic linear and control LED drive circuit, comprising:
Rectification module, for being converted to Linear Driving voltage signal, to export to LED load by city's signal of telecommunication of input;
Sampling module, for obtaining the drive current flowing through described LED load;
Feedback module, for obtaining described Linear Driving voltage signal;
Constant-current control module, for generating constant flow regulation signal according to described drive current, and for generating constant-current control signal according to described linear voltage;
Constant-current driven module is constant current for controlling described load current according to described constant flow regulation signal and described constant-current control signal.
Control in LED drive circuit at the dynamic linear according to the embodiment of the present invention,
Described rectification module comprises rectifier bridge, and the common cathode of described rectifier bridge extremely connects the positive terminal of described LED load, the extreme ground connection of common anode of described rectifier bridge, city's signal of telecommunication described in other two terminations of described rectifier bridge;
Described constant-current driven module comprises power switch pipe, and the grid of described power switch pipe connects the output of described constant-current control module, and drain electrode connects the negative pole end of described LED load;
Described sampling module comprises sampling resistor, and the first end of described sampling resistor connects the source electrode of described power switch pipe and connects the first input end of described constant-current control module, the second end ground connection; The described constant flow regulation signal of the grid voltage size for controlling described power switch pipe is generated according to the voltage swing at described sampling resistor two ends to make described constant-current control module, and export the grid of described power switch pipe to from described output, with by the voltage control at described sampling resistor two ends for constant voltage;
Described feedback module comprises the first resistance and the second resistance, described first resistance is connected the second input of described constant-current control module with the common port of the second resistance, the other end of described first resistance connects the negative pole end of described LED load, the other end ground connection of described second resistance; To make described constant-current control module generate the described constant-current control signal for controlling described power switch pipe conducting or closedown according to the voltage swing at described common port place, and export the grid of described power switch pipe to from described output.
Control in LED drive circuit at the dynamic linear according to the embodiment of the present invention, described power switch pipe is power MOSFET.
Control in LED drive circuit at the dynamic linear according to the embodiment of the present invention, described dynamic linear controls LED drive circuit and comprises the power factor regulation module controlling the power factor of LED drive circuit for improving described dynamic linear further; Wherein,
Described power factor regulation module comprises auxiliary LED load and auxiliary power switching tube;
The positive terminal of described auxiliary LED load is connected with the negative pole end of described LED load;
The drain electrode of described auxiliary power switching tube connects the negative pole end of described auxiliary LED load, and source electrode connects the first input end of described constant-current control module, and grid connects the second input of described constant-current control module; To make described auxiliary power switching tube under the control of described constant-current control module, within the closedown cycle of described power switch pipe, at least conducting a period of time improves the continuity of described drive current, to improve the power factor that described dynamic linear controls LED drive circuit.
Control in LED drive circuit at the dynamic linear according to the embodiment of the present invention, described auxiliary power switching tube is power MOSFET.
Control in LED drive circuit at the dynamic linear according to the embodiment of the present invention, described dynamic linear controls LED drive circuit and comprises decoupling capacitor further; The two ends of described decoupling capacitor are connected with the positive terminal of described LED load and negative pole end respectively.
The beneficial effect that the present invention produces is: the pattern selecting power switch pipe conducting and closedown according to the linear voltage size of LED load, greatly can improve the efficiency that linear LED drives.Specifically, at low input, when efficiency operation, constant-current control module, power switch pipe conducting, ensures the state of LED at constant current output.At high input voltage, when inefficient work, constant-current control module is closed power switch pipe by force.So in the sinusoidal ac of one-period, when mains input voltage is in non-crest, the mode of operation of the drive circuit in the present invention is the same with existing linear LED drive circuit.When mains input voltage is in crest, the power switch pipe of the drive circuit in the present invention enters " shut " mode", drive circuit can not from city's signal of telecommunication consumed power.So compare with existing linear LED drive circuit, efficiency is significantly improved.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the schematic diagram of traditional LED linear drive circuit;
Fig. 2 shows the oscillogram of the voltage at Fig. 1 interior joint 50,51,53 and 54 place;
Fig. 3 shows the circuit diagram of the dynamic linear control LED drive circuit according to the embodiment of the present invention;
Fig. 4 shows the oscillogram of the voltage at Fig. 3 interior joint 50,51,53 and 54 place;
Fig. 5 shows the circuit diagram of the drive circuit comprising power factor regulation module;
Fig. 6 shows the oscillogram of the voltage at Fig. 5 interior joint 50,51,53,56 and 54 place;
Fig. 7 shows the structural representation of the constant-current control module according to the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 3 shows the circuit diagram of the dynamic linear control LED drive circuit according to the embodiment of the present invention, as shown in Figure 3, this dynamic linear controls LED drive circuit (below can referred to as drive circuit) and comprising: rectification module 100, sampling module 200, feedback module 300, constant-current control module 400 and constant-current driven module 500.Wherein, city's signal of telecommunication of input can be converted to Linear Driving voltage signal by rectification module 100, and this Linear Driving voltage signal is exported to LED load, with driving LED loaded work piece.Sampling module 200 can obtain the drive current flowing through LED load, and exports to constant-current control module 400.Feedback module 300 can obtain Linear Driving voltage signal, and feeds back to constant-current control module 400.Like this, constant-current control module 400 can generate constant flow regulation signal according to drive current, and generates constant-current control signal according to linear voltage; And this constant flow regulation signal and constant-current control signal are exported to constant-current driven module 500.It is constant current that constant-current driven module 500 can carry out control load electric current according to constant flow regulation signal and constant-current control signal.
Specifically, in a preferred embodiment of the invention, rectification module 100 comprises rectifier bridge, and this rectifier bridge can be made up of four high-voltage diodes.Wherein, the common cathode of rectifier bridge extremely connects the positive terminal of LED load, the extreme ground connection of common anode of rectifier bridge, the other two termination civil power signals of rectifier bridge, the AC input namely in Fig. 2.
Constant-current driven module 500 comprises power switch pipe, and this power switch pipe can be power MOSFET.The grid of power switch pipe connects the output OUT of constant-current control module 400, and drain electrode connects the negative pole end of LED load.In the present invention, number designation 500 also can represent power switch pipe.
Sampling module 200 comprises sampling resistor, and the first end of sampling resistor connects the source electrode of power switch pipe, and connects the first input end CS of constant-current control module 400, the second end ground connection simultaneously.The constant flow regulation signal of the grid voltage size for controlling power switch pipe is generated according to the voltage swing at sampling resistor two ends to make constant-current control module 400, and export the grid of power switch pipe to from output OUT, with by the voltage control at sampling resistor two ends for constant voltage.
Feedback module 300 comprises the first resistance 310 and the second resistance 320, first resistance 310 is connected the second input FB of constant-current control module 400 with the common port of the second resistance 320, the other end of the first resistance 310 connects the negative pole end of LED load, the other end ground connection of the second resistance 320; To make constant-current control module 400 generate the constant-current control signal for controlling power switch pipe conducting or closedown according to the voltage swing at common port place, and export the grid of power switch pipe to from output OUT.
Fig. 4 shows the oscillogram of the voltage at Fig. 3 interior joint 50,51,53 and 54 place, and the voltage oscillogram below in conjunction with Fig. 4 sets forth the course of work of the drive circuit in Fig. 3.First, constant-current control module 400 receives the voltage at sampling resistor two ends from first input end CS, because determined the drive current of LED load by the electric current of sampling resistor, therefore, as long as be constant voltage by the voltage control at sampling resistor two ends, just the drive current of LED load can be controlled as constant current.In work, constant-current control module 400 can according to the voltage at the sampling resistor two ends obtained, generate constant flow regulation signal, this constant flow regulation signal can for directly exporting the grid voltage of power switch pipe to, by regulating the size of this grid voltage (numerical value that namely grid voltage is concrete) can guarantee that the voltage at sampling resistor two ends is steady state value, thus the drive current flowing through LED load is made to be constant current.It can be seen, the size of the Vout in constant flow regulation signal deciding Fig. 4.
On the other hand, node 50 place is the ac voltage signal Vac of input, and node 51 place is for through arranging filtered Linear Driving voltage signal (can referred to as line voltage) Vline, and this voltage signal is used for driving LED loaded work piece.Line voltage is through the dividing potential drop of LED load, the first resistance 310 and the second resistance 320, the voltage at node 55 place, i.e. input voltage VFB=(the Vline-V_led) × R_320/ (R_310+R_320) of the second input FB of constant-current control module 400, wherein, V_led is the voltage drop of LED load, R_310 and R_320 is respectively first resistance 310 of Fig. 3 and the resistance of the second resistance 320.Now, the voltage waveform at node 55 place is the same with the waveform at node 51 place, and namely the oscillogram of voltage VFB is the same with the oscillogram of Vline.
Should be noted that, the waveform of the linear voltage Vline in Fig. 4 is different from the waveform of the linear voltage Vline in Fig. 2, this is because the capacitance of the filter capacitor 101 of Fig. 1 is very large, generally needs electrochemical capacitor, and adopt traditional mode of operation, and do not consider the correction of power factor.But for the drive circuit in Fig. 3, the capacitance of its filter capacitor 101 is very little, do not need to adopt electrochemical capacitor, and likely in conjunction with the optimization of power factor, therefore, the Vline waveform of Fig. 4 and Fig. 2 is different.
In work, constant-current control module 400, according to the information of voltage of VFB, generates the constant-current control signal for controlling power switch pipe conducting or closedown, and this constant-current control signal exports to the grid of power switch pipe from the output OUT of constant-current control module 400.Such as, if the voltage swing of VFB is greater than a reference voltage preset, constant-current control module 400 generates the constant-current control signal of closing power switch pipe, thus closes the driving voltage of output OUT.Such as, as shown in Figure 4, see the waveform of the voltage Vout that the output OUT of constant-current control module 400 exports, when the voltage of Vline is greater than certain value, Vout just becomes zero potential, because output OUT is zero potential, power switch pipe is just in not on-state, be just zero by detecting the electric current of resistance, so the voltage Vcs of first input end CS is also zero, as shown in Figure 4.It can be seen, the constant-current control signal Vout determined in Fig. 4 has drive voltage signal to export, or no-voltage exports, i.e. not outputting drive voltage signal.
This voltage swing according to Vline selects the pattern of power switch pipe conducting and closedown, greatly can improve the efficiency that linear LED drives.At low input, when efficiency operation, constant-current control module 400, power switch pipe conducting, ensures the state of LED at constant current output.At high input voltage, when inefficient work, constant-current control module 400 is closed power switch pipe by force.So in the sinusoidal ac of one-period, when input voltage Vac is in non-crest, the mode of operation of the drive circuit in the present invention is the same with existing linear LED drive circuit.When input voltage Vac is in crest, the power switch pipe of the drive circuit in the present invention enters " shut " mode", drive circuit can not from city's signal of telecommunication consumed power.So compare with existing linear LED drive circuit, efficiency is significantly improved.In addition, in one cycle, some time is in closed condition to system, and the control of constant current is more difficult, and what the present invention adopted is that average current feedback technique realizes.109 of Fig. 3 is the building-out capacitor of loop.
Although adopt feedback module 300 to improve efficiency, but bring another problem, because at the crest place of one-period, drive circuit is in closed condition, input current (drive current of LED load) is zero, thus input voltage and input current is asynchronous, causes power factor and be deteriorated.So address this problem, the dynamic linear according to the embodiment of the present invention controls the power factor regulation module that LED drive circuit comprises the power factor for improving this drive circuit further.
Fig. 5 shows the circuit diagram of the drive circuit comprising power factor regulation module, and as shown in Figure 5, power factor regulation module comprises auxiliary LED load 710 and auxiliary power switching tube 720; The positive terminal of auxiliary LED load 710 is connected with the negative pole end of LED load 106; The drain electrode of auxiliary power switching tube 720 connects the negative pole end of auxiliary LED load 710, and source electrode connects the first input end CS of constant-current control module 400, and grid connects the second output out2 of constant-current control module 400; To make auxiliary power switching tube 720 under the control of constant-current control module 400, within the closedown cycle of power switch pipe, at least conducting a period of time improves the continuity of drive current, to improve the power factor that dynamic linear controls LED drive circuit.Wherein, auxiliary power switching tube 720 can be power MOSFET.
Fig. 6 shows the oscillogram of the voltage at Fig. 5 interior joint 50,51,53,56 and 54 place, and wherein, node 50 place is the voltage Vac of city's signal of telecommunication of input; Node 51 place is through filtered line voltage Vline; Node 53 place is the output voltage Vout of the output OUT of constant-current control module 400; Node 56 place is the output voltage Vout2 of the second output OUT2 of constant-current controller; Node 54 place is the voltage Vcs of the first input end CS of constant-current control module 400.
Composition graphs 5 and Fig. 6 can find out, auxiliary LED load 710 at least conducting a period of time within the closedown cycle of power switch pipe, preferably, and the crest district ON operation only inputted close to alternating current.Auxiliary power switching tube 720 is for controlling the work period of auxiliary LED load 710.Such as, as shown in Figure 6, the waveform of driving voltage Vout2 of the auxiliary power switching tube that the second output OUT2 see constant-current control module exports, it selects close to the conducting of crest time zone.Greatly can reduce the time of power switch pipe and the not conducting all simultaneously of auxiliary power switching tube like this, namely improve the continuity of input current, thus improve the power factor of system.
Still as shown in Figure 3 and Figure 5, the dynamic linear control LED drive circuit according to the embodiment of the present invention also can comprise decoupling capacitor 600 further; The two ends of this decoupling capacitor 600 are connected with the positive terminal of LED load and negative pole end respectively.This decoupling capacitor can reduce the ripple of LED output current, reduces the light decay of LED, ensures its life-span.
Fig. 7 shows the structural representation of the constant-current control module according to the embodiment of the present invention, and as shown in Figure 7, this constant-current control module comprises power supply unit 401, for current constant control mould improves reference voltage and supply power voltage.Also comprise line voltage detection unit 403, detected the size of input voltage by second input (i.e. FB pin) of current constant control mould, select current constant control mould to be operated in different mode of operations.Current constant control mould also comprises loop constant-current control unit 404,405 and 406, and average current detection unit 404, by the signal of detection line voltage detection unit 403 and first input end, calculates the average current by LED load.Wherein label 405 represents error amplifier, and its effect ensures that the end of oppisite phase voltage of error amplifier 405 equals the reference voltage of positive terminal by the input signal of adjustment loop constant-current control unit 406, thus ensures constant output current value.Constant-current control module also comprises logic control element 407, and it is the signal transacting center of whole drive circuit.It controls the switch of driver element 408, while finally realizing constant current driving, ensures the high efficiency of system, High Power Factor.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection range that all should belong to claims of the present invention.
Claims (5)
1. dynamic linear controls a LED drive circuit, it is characterized in that, comprising:
Rectification module, for being converted to Linear Driving voltage signal, to export to LED load by city's signal of telecommunication of input;
Sampling module, for obtaining the drive current flowing through described LED load;
Feedback module, for obtaining described Linear Driving voltage signal;
Constant-current control module, for generating constant flow regulation signal according to described drive current, and for generating constant-current control signal according to described Linear Driving voltage signal;
Constant-current driven module is constant current for controlling described load current according to described constant flow regulation signal and described constant-current control signal;
Power factor regulation module, controls the power factor of LED drive circuit for improving described dynamic linear; Described power factor regulation module comprises auxiliary LED load and auxiliary power switching tube; Wherein:
The positive terminal of described auxiliary LED load is connected with the negative pole end of described LED load;
The drain electrode of described auxiliary power switching tube connects the negative pole end of described auxiliary LED load, and source electrode connects the first input end of described constant-current control module, and grid connects the second output out2 of described constant-current control module; To make described auxiliary power switching tube under the control of described constant-current control module, within the closedown cycle of described power switch pipe, at least conducting a period of time improves the continuity of described drive current, to improve the power factor that described dynamic linear controls LED drive circuit.
2. dynamic linear according to claim 1 controls LED drive circuit, it is characterized in that,
Described rectification module comprises rectifier bridge, and the common cathode of described rectifier bridge extremely connects the positive terminal of described LED load, the extreme ground connection of common anode of described rectifier bridge, city's signal of telecommunication described in other two terminations of described rectifier bridge;
Described constant-current driven module comprises power switch pipe, and the grid of described power switch pipe connects the output of described constant-current control module, and drain electrode connects the negative pole end of described LED load;
Described sampling module comprises sampling resistor, and the first end of described sampling resistor connects the source electrode of described power switch pipe and connects the first input end of described constant-current control module, the second end ground connection; The described constant flow regulation signal of the grid voltage size for controlling described power switch pipe is generated according to the voltage swing at described sampling resistor two ends to make described constant-current control module, and export the grid of described power switch pipe to from described output, with by the voltage control at described sampling resistor two ends for constant voltage;
Described feedback module comprises the first resistance and the second resistance, described first resistance is connected the second input of described constant-current control module with the common port of the second resistance, the other end of described first resistance connects the negative pole end of described LED load, the other end ground connection of described second resistance; To make described constant-current control module generate the described constant-current control signal for controlling described power switch pipe conducting or closedown according to the voltage swing at described common port place, and export the grid of described power switch pipe to from described output.
3. dynamic linear according to claim 2 controls LED drive circuit, and it is characterized in that, described power switch pipe is power MOSFET.
4. dynamic linear according to claim 2 controls LED drive circuit, and it is characterized in that, described auxiliary power switching tube is power MOSFET.
5. the dynamic linear according to any one of claim 1-4 controls LED drive circuit, it is characterized in that, described dynamic linear controls LED drive circuit and comprises decoupling capacitor further; The two ends of described decoupling capacitor are connected with the positive terminal of described LED load and negative pole end respectively.
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| CN201310046424.7A CN103108470B (en) | 2013-02-06 | 2013-02-06 | Dynamic linear control light emitting diode (LED) driver circuit |
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| CN2664278Y (en) * | 2003-10-31 | 2004-12-15 | 上海新华电子设备有限公司 | DC/DC power supply module having under-voltage and current-limiting protection |
| CN201491339U (en) * | 2009-08-20 | 2010-05-26 | 浙江光益光能科技有限公司 | LED driving circuit |
| CN203072226U (en) * | 2013-02-06 | 2013-07-17 | 深圳市芯飞凌半导体有限公司 | Dynamic-linear-control LED driving circuit |
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| Publication number | Publication date |
|---|---|
| CN103108470A (en) | 2013-05-15 |
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Effective date of registration: 20210319 Address after: Building C, No.888, Huanhu West 2nd Road, Lingang New District, Pudong New Area pilot Free Trade Zone, Shanghai Patentee after: Shanghai Xinfei Semiconductor Technology Co.,Ltd. Address before: 8g, west block, Changxing Plaza, 126 Changxing Road, Nanshan District, Shenzhen, Guangdong 518000 Patentee before: SILICON DRIVER SEMICONDUCTOR Co.,Ltd. |