CN101572972B - Dimmable LED constant-current drive circuit - Google Patents
Dimmable LED constant-current drive circuit Download PDFInfo
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- CN101572972B CN101572972B CN200910039996.6A CN200910039996A CN101572972B CN 101572972 B CN101572972 B CN 101572972B CN 200910039996 A CN200910039996 A CN 200910039996A CN 101572972 B CN101572972 B CN 101572972B
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Abstract
The invention relates to a dimmable constant-current drive circuit, belongs to the technical field of current drive circuits, and in particular relates to improvement on a dimmable LED constant-current drive circuit, which comprises a lighting protection and electromagnetic compatible circuit (1), a power factor correction circuit (2), a plurality of constant current power circuits (3,4), a dimmable control power supply circuit (6), a dimmable control circuit (5) with a serial interface, and an alarm detection circuit (7), wherein the alarm detection circuit (7) extracts an alarm signal from the constant current power circuits (3,4), and outputs the signal to the dimmable control circuit (5) after identification processing. The dimmable LED constant-current drive circuit can resist external electromagnetic interference and provide dynamic compensation, and has superior electric energy utilization rate even when load changes dynamically, thereby improving electricity-saving effect, performing programming control or network monitoring on illuminating devices and realizing various required illumination effects.
Description
Affiliated technical field
The present invention relates to a kind of tunable optical constant-current drive circuit, belong to current driving circuit technical field, relate in particular to the improvement of Dimmable LED constant-current drive circuit.For the load forming for electric drive and adjusting light-emitting diode (LED).Comprise lightning protection and electromagnetic compatibility circuit, power factor correction circuit, some constant-current power supply circuits, brightness adjustment control power supply circuits, adjusting control circuit.
Background technology
Since the sixties in 20th century are born first light-emitting diode, within the quite a long time, due to the limitation of output lumen, LED is just applied in signal designation purposes.To 20th century the nineties, blue-ray LED is because the implementation method of less expensive is able to commercialization.Enter 21st century, large power white light LED is developed successfully and promptly industrialization.Around here, due to the intervention of large-scale lighting source electric corporation, for example PHILIPS and OSRAM, the light efficiency of high-brightness white-light LED has been obtained breakthrough improvement, and promptly starts to enter the application of general lighting.At present, the light efficiency of high-brightness white-light LED, under good radiating condition, has surmounted the light efficiency of fluorescent lamp.Along with more technology and capital input, the light efficiency of high-brightness LED is in continuous raising, and its cost starts to decline fast, and finally its ratio of performance to price will be accepted by ordinary consumer.The application of LED in lighting field extremely extensively, with various, is considered to the revolution for the third time in artificial light sources, and its impact bringing will be very far-reaching.
According to USDOE (DOE) statistics, the electric energy of the U.S. 22% is for illumination.DOE claims in 20 years from now on, and the LED illumination Jiang U.S. is popularized fast, can reduce by 62% illumination power requirement.In addition, it can eliminate the silicon dioxide discharge capacity of 2.58 hundred million tons, builds less 133 new power plant.Adopt LED illumination can make finance reduce more than 1,150 hundred million dollars.
LED is due to environmental protection, the many merits such as the life-span is long, photoelectric efficiency is high, in every profession and trade application, be able to fast development in recent years, the driving power of LED has become the focus of attention, in theory, the useful life of LED is more than 100,000 hours, but in actual application, because design and the type of drive selection of driving power are improper, LED is very easily damaged.
The method of LED brightness adjustment, has DC driven and pulse width modulation to drive 2 kinds of type of drive conventionally.DC driven is exactly the driving that directly changes current value, and pulse width modulation drives (PWM) not change current value and with the driving of ratio (duty ratio) change streaming current time of the make-and-break time of pulse.
For realizing object with an automatic light meter, people often realize automatically and controlling by timer or light sensor etc., as patentee Zhou Anping, the name of application on April 9th, 2008 is called " adjustable light LED lighting lamp " (patent No.: 200820085623.3, open (bulletin) day: on January 7th, 2009, publication number: patent CN201177243), the adjustable light LED lighting lamp that this utility model provides, with light-emitting diode [LED], power circuit and LED driving circuit form, in drive circuit, have and take the light modulation pwm control circuit [I] that timer integrated circuit [NE] is core, light modulation pwm control circuit has PWM output [3], separately there is the luminous constant-current source chip circuit [II] with voltage input end of driving LED, this voltage input end is connected through a resistance [R3] with the PWM output in light modulation pwm control circuit.At the voltage input end of constant-current source chip circuit, input the bright dark of the adjustable LED of PWM.
Similar above-mentioned prior art also has a lot, mainly to realize the connecting and disconnecting of the circuit that has actual conditions, light modulation, cannot meet according to environmental change, the predetermined demand of user, the conditions such as centralized consent control realize the illumination intelligent of real meaning and control, regulate and control single, difficulty, as will be changed controlled condition or parameter, will change corresponding hardware, and do not provide the calibration lightning protection of power power factor (PF) and electromagnetic compatibility circuit, therefore, the high order harmonic component producing can cause harmonic pollution and interference to electrical network and other electrical equipment, and it is also poor self to resist outside electromagnetic interference capability.
Summary of the invention
The present invention is directed to autogenous control sealing that Dimmable LED drive circuit in prior art exists and electrical network is existed and polluted and the problem such as self anti-electromagnetic interference performance is poor, a kind of cluster regulation and control, few harmonic pollution, Dimmable LED constant-current drive circuit that anti-electromagnetic interference capability is strong be convenient to is provided.
For solving the problems of the technologies described above, the present invention is solved by following technical solution: a kind of Dimmable LED constant-current drive circuit, comprise lightning protection and electromagnetic compatibility circuit 1, power factor correction circuit 2, some constant-current power supply circuits 3,4, brightness adjustment control power supply circuits 6, adjusting control circuit 5, wherein: lightning protection and electromagnetic compatibility circuit 1, input is connected with city's alternating current; Power factor correction circuit 2, input is connected with electromagnetic compatibility circuit 1 output with lightning protection; Some constant-current power supply circuits 3,4, input is connected with power factor correction circuit 2 outputs; Brightness adjustment control power supply circuits 6, input is connected with power factor correction circuit 2 outputs; With the adjusting control circuit 5 of serial line interface, input is connected with brightness adjustment control power supply circuits 6 outputs, and output is connected with some constant-current power supply circuits 3,4.
Also comprise alarm detection circuit 7, described alarm detection circuit 7 extracts alarm signal from constant-current power supply circuit 3,4, exports to adjusting control circuit 5 after identifying processing.
Described alarm signal is the voltage signal of constant-current power supply circuit 3,4 outputs.
Described lightning protection and electromagnetic compatibility circuit 1 are 2 level electromagnetic compatibles, through inductance L 5, after L6, capacitor C 63 filtering, lightning protection piezo-resistance R110 carrying out surge protection, by common mode inhibition transformer T2, T6 and safety capacitor C 63, C18, C33, C42, C7, C4, C10 forms 2 level electromagnetic compatibles, and at 2 grades of transformer T2, T6 output arranges L3 choke, leach interference, then export to PFC correcting circuit 2 through full-wave rectification BD1.
Described power factor correction circuit 2 comprises that step-up transformer T3, connection transformer T3 are former, the Active PFC chip U4 of secondary both sides and peripheral Resistor-Capacitor Unit thereof, MOS switching tube Q2, voltage stabilizing didoe Z2, by control MOS switching tube Q2, close and close, stop high order harmonic component output.
Described constant-current power supply circuit 3,4 adopts single-ended reverse exciting mode, by the power supply through power factor correction circuit 2 outputs, after inputting the transformer T4 of this circuit, export to LED, the comparison circuit that the constant-current control circuit that interconnective built-in metal-oxide-semiconductor galvanostat U7 and peripheral Resistor-Capacitor Unit thereof form respectively in former, the secondary both sides of transformer T4 and reference voltage chip U2, comparator U6, three machine pipe Q4 and peripheral Resistor-Capacitor Unit form, T4 adjustable stabling current of level output of control transformer.
Described brightness adjustment control power supply circuits 6, by the power supply through power factor correction circuit 2 outputs, input the power supply of 2 groups of different voltages of reduced output voltage after the transformer T7 of this circuit, for adjusting control circuit 5, wherein 1 group of power supply is in former, the secondary both sides of transformer T7 difference interconnective built-in metal-oxide-semiconductor galvanostat U13, reference voltage chip U15, peripheral Resistor-Capacitor Unit, optocoupler U14, the stabilized voltage power supply of T7 level output of control transformer.
The described adjusting control circuit 5 with serial line interface, comprising: central processing unit CPU device U8 and peripheral Resistor-Capacitor Unit, crystal X1 form plug-in control centre; The 232 serial interface chip IC 1 that You Yu control centre is connected and the peripheral serial interface circuit forming, the RS485 serial interface chip U3 being connected with control centre and peripheral cell RS485 serial interface circuit, realize the automatic distribution function in address of each light fixture, reception control signal or network monitoring signal; The interface circuit that the RS485 interface chip U12 being connected with control centre and peripheral cell, transformer T9 form, user arranges the address of light fixture by this interface, this serial ports is converted to RS232 level by IC1, outputs to external interface, carry out the setting of address, light modulation instruction transformation, for needing other pwm signal of level, is exported to constant-current source 3,4, reach dimming effect, optocoupler IC4 is wherein set, and IC5 carries out signal isolation, in order to avoid circuit is punctured by outside surging signal.
Described alarm-monitor circuit 7 comprises LED circuit sample circuit, from constant-current source, samples again through triode Q1, and Q3 amplification exports not gate U1 to, exports to adjusting control circuit 5.
A kind of Dimmable LED constant-current drive circuit of the present invention has following beneficial effect:
1. owing to adopting open environment with the adjusting control circuit of serial line interface, can communicate by letter with illumination control centre by remote control signal transmission unit, thereby complete the relevant controlling (as ON/OFF, brightness adjustment control) to every lamp, and can to the operating state of every lamp, carry out relevant monitoring by illumination control centre, without being in the action, just can control various ruuning situation, can realize the Based Intelligent Control such as timing monitoring, detection and execution switch dimming, make again operation costs greatly reduce;
2. owing to adopting power factor correction circuit (pfc circuit), to power supply, increase pfc circuit, object is exactly in order to reduce harmonic pollution and the interference to electrical network and other electric equipments of the high order harmonic component that produces in power supply, thereby improved the utilance to electric energy, dynamic compensation can be provided, even while loading on dynamic change, also can have more outstanding utilization rate of electrical, thereby promote power savings.
3. owing to adopting electromagnetic compatibility (EMC) circuit, can resist outside electromagnetic interference, reduce the infringement of thunderbolt to circuit.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, to adopting a kind of LED constant-current drive circuit of the present invention, embodiment is elaborated.Described embodiment is that the mode with indefiniteness example provides:
Fig. 1 is schematic block circuit diagram of the present invention;
Fig. 2 is EMC protection circuit schematic diagram in the present invention;
Fig. 3 is PFC correcting circuit schematic diagram in the present invention;
Fig. 4 is constant-current source circuit schematic diagram in the present invention;
Fig. 5 is brightness adjustment control power supply circuits schematic diagram in the present invention;
Fig. 6 is alarm-monitor circuit theory diagrams in the present invention;
Fig. 7 is adjusting control circuit schematic diagram in the present invention;
Fig. 8 is another kind of adjusting control circuit schematic diagram in the present invention.
Embodiment
If Fig. 1 is the constant-current source circuit of tunable optical, comprise EMC protection circuit 1, PFC correcting circuit 2; Constant-current source circuit 3,4, adjusting control circuit 5; Brightness adjustment control power supply circuits 6 form; The input of described EMC protection circuit 1 is received external AC 220V input, output is connected to PFC correcting circuit 2, the 400V constant voltage signal of described PFC correcting circuit 2 outputs is exported to constant-current source circuit 3,4, and light modulation power supply circuits 6, described constant-current source 3,4 outputs drive outside light fixture, the output output pwm signal of described adjusting control circuit 5 drives constant-current source 3,4, to reach light modulation object.The constant voltage signal of described brightness adjustment control power supply circuits 6 output provides brightness adjustment control 5.Described alarm-monitor circuit 7 extracts alarm signal from constant-current source 3,4, and outputting alarm signal is to adjusting control circuit 5.
Wherein EMC and harmonic wave index are realized by lightning protection and EMC circuit module; PF > 0.9 index is realized by PFC power factor correction circuit; Constant current function is realized by constant-current circuit module; Dimming function is realized by brightness adjustment control plate.Apparent power index is realized jointly by PFC power factor correction circuit and constant-current circuit.
Described EMC protection circuit 1 as shown in Figure 2, by common mode inhibition transformer T2, T6, and X, Y capacitor C 63, C18, C33, C42, C7, C4, C10 forms, and carrying out surge protection is by piezo-resistance R110, fuse F3, inductance L 3, L5, L6 forms, and full-wave rectification has BD1, and TH1 completes.
Its principle is that the AC signal of input is passed through surging protection circuit R110, realize the protection to surging signal on line, then signal, after EMC protection circuit, leaches interference, by the test of conduction interference, signal is undertaken exporting to PFC correcting circuit 2 after rectification by BD1.
Described PFC correcting circuit 2 as shown in Figure 3, by U4 (chip MC33262), transformer T3 and voltage stabilizing didoe D3, D6, the compositions such as Z3.
Its principle is that traditional bridge rectifier, capacitor filter can make AC input current produce serious wave distortion, to electrical network, inject a large amount of high order harmonic components, therefore the power factor of net side is not high, only has 0.6 left and right, and electrical network and other electric equipment are caused to serious harmonic pollution and interference.In electronic power supply product, introduce pfc circuit, just can greatly improve the utilization ratio to electric energy.This circuit adopts active PFC chip to complete the power factor (PF) index of PF>0.96.
PFC correcting circuit 2 is output as the direct current signal of 400V, directly exports to constant-current source 3,4, and adjusting control circuit 6.
Constant-current source 3,4 is same circuit structure, take constant-current source 3 as example, as Fig. 4, mainly by U7 (metal-oxide-semiconductor KE2A280Z), optocoupler U5, U9 (TLP181), benchmark U2 (TL431), comparator U6 (LM293), three machine pipe Q4 (PMBT3906), voltage-stabiliser tube Z1, Z3, Z4, Z5, Z6 (IN4752), transformer T4 forms.Output LED1 node is connected to outside light fixture, driving LED.
Its principle is the mode of the single-ended reverse exciting of employing, with benchmark U2 (TL431), produce voltage reference and export to comparator U6 (LM293), after being converted to voltage signal after by resistance R 32, the electric current of output light fixture also goes out to comparator, comparator and reference voltage compare, when output current exceeds set point, and comparator output reversion, optocoupler U5 (TLP181) conducting, thereby control the switch of metal-oxide-semiconductor U7, make to export energy and reduce, thereby make output current remain stable.Triode Q4 (PMBT3906) receives the pwm control signal DIM of adjusting control circuit 5 outputs, by the reference voltage of this signal controlling benchmark U2 (TL431), this reference voltage is exported to comparator U6, thereby can realize variable output current, reaches the object of light modulation.
Brightness adjustment control power supply circuits 6, as Fig. 5, by U13 (metal-oxide-semiconductor KE2A280Z), optocoupler U14 (TLP181), transformer T7, benchmark U15 (TL431) forms.Output 7V, 5V is given to adjusting control circuit 5.
Its principle is by the be converted to+7V of 400V DC signal of PFC correcting circuit 2 outputs, and+5V is DC-DC conversion.
Alarm-monitor circuit 7 is as Fig. 6, by triode Q1, and Q3 (PMBT3906), not gate U1 (CD4096) forms.Input signal is the output of constant-current source 3,4, and alarm-monitor circuit 7 is exported to adjusting control circuit 5.
Its principle is by R23, and R100 monitors electric power outputting current, when Non voltage output, and WAINNING1,2 output low levels, anti-phase through U1 is high level, as alarm signal, delivers to adjusting control circuit 5.When no current is exported, CV1 is low level, and through Q1, Q3 drives as WAINNING3,4, and anti-phase through U1 is high level, as alarm signal, delivers to adjusting control circuit 5.
Adjusting control circuit 5, as Fig. 7, by CPU device U8 (Atemga8L), crystal X1 (7.3728M), optocoupler IC4, IC5 (6N137), optocoupler U3, U21 (TLP181), serial interface chip IC 1 (MAX3232), U12 (65HVD3082) forms.
Its principle is that the dim signal of outside input accesses by RS485 bus, through U12, is converted to digital data-signal, is input to the serial ports of CPU U8, after having CPU to process, light modulation instruction transformation, for needing other pwm signal of level, is exported to constant-current source 3,4, reach dimming effect.CPU, by gathering the alarm signal of alarm-monitor circuit 7 outputs, is passed through serial ports, by U12, sends RS485 bus to, delivers to control centre and processes.The another one function of CPU is the function of virtual serial port, and user arranges the address of light fixture by this interface, and this serial ports is converted to RS232 level by IC1, outputs to external interface, carries out the setting of address.The function that optocoupler is realized is to isolate, in order to avoid circuit is punctured by outside surging signal.
Fig. 8 is the replacement circuit of adjusting control circuit 5, by CPU device U8 (Atemga8L), and crystal X1 (7.3728M), optocoupler IC1, IC2, IC4, IC5 (6N137), RS485 level shifter interface chip U3 (ISL8488), U12 (65HVD3082) forms.
Its principle is by U3 and U8, to realize the automatic distribution function in address of each light fixture, U3 monitors the sense of input automatically, the information of receiving feeds back to CPU U8, CPU carries out address setting operation according to agreement, setting operation is complete, CPU sends address to next light fixture order is set, thereby completes the address Lookup protocol to whole system light fixture.This function is original creation function.
Certainly, the invention is not restricted to address the embodiment shown in accompanying drawing, modification and equivalent transformation that the spirit of Fan Yiben creation is done, or adopt on this basis various deformation, all belong in protection range of the present invention.
Claims (6)
1. a Dimmable LED constant-current drive circuit, it is characterized in that, comprise lightning protection and electromagnetic compatibility circuit (1), power factor correction circuit (2), some constant-current power supply circuits (3, 4), brightness adjustment control power supply circuits (6), adjusting control circuit (5), lightning protection is connected with electric main with electromagnetic compatibility circuit (1) input, power factor correction circuit (2) input is connected with electromagnetic compatibility circuit (1) output with lightning protection, some constant-current power supply circuits (3, 4) input is connected with power factor correction circuit (2) output, brightness adjustment control power supply circuits (6) input is connected with power factor correction circuit (2) output, adjusting control circuit (5) with serial line interface, input is connected with brightness adjustment control power supply circuits (6) output, output and some constant-current power supply circuits (3, 4) connect, it is characterized in that:
Described lightning protection and electromagnetic compatibility circuit (1) are 2 level electromagnetic compatibles, and electric main is through inductance L 5, after L6, capacitor C 63 filtering, lightning protection piezo-resistance R110 carrying out surge protection, by common mode inhibition transformer T2, T6 and safety capacitor C 63, C18, C33, C42, C7, C4, C10 forms 2 level electromagnetic compatibles, and at 2 grades of transformer T2, T6 output arranges L3 choke, leach interference, then export to power factor correction circuit (2) through full-wave rectification BD1.
2. a kind of Dimmable LED constant-current drive circuit according to claim 1, is characterized in that:
Described power factor correction circuit (2) comprises that step-up transformer T3, connection transformer T3 are former, the Active PFC chip U4 of secondary both sides and peripheral Resistor-Capacitor Unit thereof, MOS switching tube Q2, voltage stabilizing didoe Z2, by control MOS switching tube Q2, close and close, stop high order harmonic component output.
3. a kind of Dimmable LED constant-current drive circuit according to claim 2, is characterized in that:
Described constant-current power supply circuit (3,4) adopts single-ended reverse exciting mode, will be through the power supply of power factor correction circuit (2) output, after inputting the transformer T4 of this circuit, export to LED, the comparison circuit that the constant-current control circuit that interconnective built-in metal-oxide-semiconductor galvanostat U7 and peripheral Resistor-Capacitor Unit thereof form respectively in former, the secondary both sides of transformer T4 and reference voltage chip U2, comparator U6, three machine pipe Q4 and peripheral Resistor-Capacitor Unit form, T4 adjustable stabling current of level output of control transformer.
4. according to a kind of Dimmable LED constant-current drive circuit described in claim 1 or 2 or 3, it is characterized in that:
Described brightness adjustment control power supply circuits (6), will be through the power supply of power factor correction circuit (2) output, input the power supply of 2 groups of different voltages of reduced output voltage after the transformer T7 of this circuit, for adjusting control circuit (5), wherein 1 group of power supply is in former, the secondary both sides of transformer T7 difference interconnective built-in metal-oxide-semiconductor galvanostat U13, reference voltage chip U15, peripheral Resistor-Capacitor Unit, optocoupler U14, the stabilized voltage power supply of T7 level output of control transformer.
5. according to a kind of Dimmable LED constant-current drive circuit described in claim 1 or 2 or 3, it is characterized in that:
The described adjusting control circuit with serial line interface (5), comprising:
Central processing unit CPU device U8 and peripheral Resistor-Capacitor Unit, crystal X1 form plug-in control centre;
The serial interface circuit that the 232 serial interface chip IC 1 that are connected with control centre form, reception control signal or network monitoring signal;
The serial ports of computers interface circuit RS485 serial interface circuit that the RS485 serial interface chip U12 being connected with control centre and peripheral cell, transformer T9 form, user arranges the address of light fixture by this interface, this serial ports is converted to RS232 level by IC1, output to external interface, carry out the setting of address, by light modulation instruction transformation, be to need other pwm signal of level, export to constant-current power supply circuit (3,4), reach dimming effect, optocoupler IC4 is wherein set, IC5 carries out signal isolation, in order to avoid circuit is punctured by outside surging signal.
6. according to a kind of Dimmable LED constant-current drive circuit described in claim 1 or 2 or 3, it is characterized in that:
The described adjusting control circuit with serial line interface (5), comprising:
Central processing unit CPU device U8 and peripheral Resistor-Capacitor Unit, crystal X1 form built-in control program control centre;
The serial ports of computers interface circuit RS485 serial interface circuit that the RS485 serial interface chip U12 being connected with control centre and peripheral cell, transformer T9 form, user arranges the address of light fixture by this interface, this serial ports is converted to RS232 level by IC1, output to external interface, carry out the setting of address, by light modulation instruction transformation, be to need other pwm signal of level, export to constant-current power supply circuit (3,4), reach dimming effect, optocoupler IC4 is wherein set, IC5 carries out signal isolation, in order to avoid circuit is punctured by outside surging signal;
The serial ports of computers interface circuit RS485 serial interface circuit that the RS485 serial interface chip U3 being connected with control centre and peripheral cell form, realizes the automatic distribution function in address of each light fixture.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910039996.6A CN101572972B (en) | 2009-06-04 | 2009-06-04 | Dimmable LED constant-current drive circuit |
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| CN200910039996.6A CN101572972B (en) | 2009-06-04 | 2009-06-04 | Dimmable LED constant-current drive circuit |
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| CN109640446A (en) * | 2018-12-24 | 2019-04-16 | 欧普照明股份有限公司 | A kind of IC chip, driving circuit and lamp control system |
| CN111627383B (en) * | 2020-07-17 | 2021-02-23 | 深圳市Tcl高新技术开发有限公司 | LED drive circuit, lamp panel and display panel |
| CN116437526B (en) * | 2023-06-13 | 2023-10-17 | 厦门普为光电科技有限公司 | Wide-voltage self-adaptive light-emitting diode constant-current driving circuit |
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| CN201039532Y (en) * | 2007-04-25 | 2008-03-19 | 鹤山丽得电子实业有限公司 | A LED light-adjusting device |
| CN201178507Y (en) * | 2008-04-14 | 2009-01-07 | 曹型勇 | Constant-current automatic light regulating electric source for LED traffic light |
| CN201450636U (en) * | 2009-06-04 | 2010-05-05 | 广州冠今电子科技有限公司 | LED constant-current drive circuit capable of regulating light |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201039532Y (en) * | 2007-04-25 | 2008-03-19 | 鹤山丽得电子实业有限公司 | A LED light-adjusting device |
| CN201178507Y (en) * | 2008-04-14 | 2009-01-07 | 曹型勇 | Constant-current automatic light regulating electric source for LED traffic light |
| CN201450636U (en) * | 2009-06-04 | 2010-05-05 | 广州冠今电子科技有限公司 | LED constant-current drive circuit capable of regulating light |
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| CN101572972A (en) | 2009-11-04 |
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