CN103561527A - Dual-function LED drive circuit - Google Patents
Dual-function LED drive circuit Download PDFInfo
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- CN103561527A CN103561527A CN201310581003.4A CN201310581003A CN103561527A CN 103561527 A CN103561527 A CN 103561527A CN 201310581003 A CN201310581003 A CN 201310581003A CN 103561527 A CN103561527 A CN 103561527A
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Abstract
The invention belongs to the technical field of automobile lamps, and particularly relates to a dual-function LED drive circuit. The dual-function LED drive circuit comprises a protective circuit module, a power supply module, a PWM signal generating module, a current adjusting module, a fault diagnosis module and an LED lamp. The protective circuit module, the power supply module, the PWM signal generating module and the current adjusting module are electrically connected in sequence. The output end of the protective circuit module and the output end of the current adjusting module are connected with the anode and the cathode of the LED lamp respectively, the input end of the fault diagnosis module is connected with the cathode of the LED lamp, and the output end of the fault diagnosis module is connected with the PWM signal generating module. The LED drive circuit is controlled by PWM, a constant flow source is adopted to control a field effect transistor in the LED drive circuit to enable the current flowing through the LED lamp to be constant, the uniformity and stability of LED brightness are ensured, two kinds of light with different kinds of brightness can be emitted by a series of LED lamps through the drive circuit, the number of the LED light sources on an automobile body is effectively reduced, and the space utilization rate of the automobile body is improved.
Description
Technical field
The invention belongs to automobile lamp technical field, be specifically related to a kind of difunctional LED drive circuit, espespecially by single led light source, realize difunctionally, and can guarantee the drive circuit of plurality of LEDs uniformity of luminance and low heat-resisting risk.
Background technology
In the design of current LED car light signal lighting circuit, while realizing a certain car light function by plurality of LEDs, the consistency of LED brightness and the parameter such as photochromic are all had relatively high expectations.Traditional LED drive circuit is normally realized single function with single light source, and the control of its brightness conventionally adopts resistance-type structure or realizes by digital dimming or simulation light modulation.Mode to resistance-type structure control brightness, when fluctuation appears in the electric current of input power, the brightness of LED will change, and does not meet the requirement of car light LED brightness uniformity; To simulation light modulation, the principle of its light modulation is the size that directly regulates LED input current, and because the photochromic of LED and its input current have substantial connection, therefore, when adopting simulation light modulation, it is photochromic also can change because of the fluctuation of electric current; Adopt digital dimming, PWM controls, and because the principle of its control is the current constant that keeps LED, changes the duration of LED power-on time in the unit interval, and duty is recently realized, thereby it photochromicly can not change, and meets designing requirement.And while adopting PWM to control LED, conventionally just adopt the light source of single LED to realize single function, concerning need to realizing the car light of several functions, just need a plurality of LED light sources, and on vehicle body, LED light source is more, its geometric space taking is just more, is unfavorable for vehicle requirement handsome in appearance.
Summary of the invention
Object of the present invention is exactly the deficiency existing in order to solve above-mentioned background technology, and a kind of difunctional LED drive circuit is provided.
The technical solution used in the present invention is: a kind of difunctional LED drive circuit, comprise the protective circuit module being connected with vehicle body two-way input signal, power module, fault diagnosis module, LED lamp, and respectively with vehicle body pwm signal generation module and current regulating module that wherein a road input signal is connected, described protective circuit module, power module, pwm signal generation module, current regulating module is electrically connected to successively, the output of described protective circuit module and the output of current regulating module are connected respectively anode and the negative electrode of LED lamp, described fault diagnosis module input is connected with LED lamp cathode, output connects pwm signal generation module.
Further; described protective circuit module comprises capacitor C 1, capacitor C 2, capacitor C 3, resistance R 1, resistance R 2, voltage-stabiliser tube D1 and voltage-stabiliser tube D2; after described capacitor C 1 is in parallel with resistance R 1, connect with voltage-stabiliser tube D1; after described capacitor C 2 is in parallel with resistance R 2, connect with voltage-stabiliser tube D2, described voltage-stabiliser tube D1 is connected capacitor C 3, LED lamp anode and power module input with voltage-stabiliser tube D2 negative electrode.
Further; described power module comprises voltage-regulation chip, triode T1 and triode T2; described voltage-regulation chip, triode T1 and triode T2 are connected to form negative-feedback circuit; described voltage-regulation chip output pin connects pwm signal module, and the collector electrode of triode T1 connects the voltage-stabiliser tube D2 negative electrode in protective circuit module.
Further, in described negative-feedback circuit, triode T1 emitter connects the voltage output end pin of voltage-regulation chip, triode T1 base stage connecting triode T2 collector electrode, triode T2 base stage connects voltage-regulation chip reference voltage pin, between described triode T1 and voltage-regulation chip, be also provided with capacitor C 4 and resistance R 4, capacitor C 4 and resistance R 4 series connection, resistance R 4 one end ground connection.
Further, described pwm signal generation module comprises programming chip, temperature sensing circuit, triode T3, triode T4, the CLKIN pin connecting triode T3 base stage of described programming chip, triode T3 collector electrode connecting triode T4 base stage, triode T4 collector electrode connects current regulating module, described programming chip IC SPDAT pin connects temperature sensing circuit output, described programming chip IC SPCLK pin connects the output pin of voltage-regulation chip, and described programming chip CLKOUT pin connects fault diagnosis module output.
Further, described temperature sensing circuit comprises resistance R 9 and the warming resistance R P1 of series connection, and described resistance R 9 one end connect power supply, between described programming chip IC SPDAT pin contact resistance R9 and warming resistance R P1.
Further, described current regulating module comprises mirror-image constant flow source Q1, triode T7 and field-effect transistor T8, described mirror-image constant flow source Q1 positive pole is connected pwm signal generation module, by field-effect transistor T8, is connected LED lamp cathode, described mirror-image constant flow source Q1 negative pole connecting triode T7 collector electrode simultaneously by resistance.
Further, described fault diagnosis module comprises a plurality of electric capacity of series connection, each electric capacity is in parallel with one of them fluorescent tube of LED lamp respectively, electric capacity one end in parallel with LED lamp tail end fluorescent tube is also provided with diode D5 in parallel and capacitor C 24, the CLKOUT pin of diode D5 anodic bonding programming chip.
LED drive circuit of the present invention adopts PWM to control, and in the drive circuit of LED, adopted again constant-current source to carry out controlling filed effect transistor, make to flow through the current constant of LED lamp, guarantee uniformity and the stability of the brightness of LED, by this kind of drive circuit, realize a string LED lamp and send the light of two kinds of different brightness, LED light source quantity on can effective less vehicle body, increases the space availability ratio of vehicle body, better realizes hairstylist's moulding intention.Pwm signal generation module wherein, the switching signal of receiving position lamp, and the disablement signal in LED circuit provide suitable duty ratio to the current source of LED simultaneously.Current regulating module, by receiving the pulse signal of PWM, provides the drive current that meets LED technical specification to the negative electrode of LED, and the uniformity of luminance of the LED in whole circuit is guaranteed.When losing efficacy appears in a string LED light source of LED circuit, relevant fault message can send to control chip automatically by fault diagnosis module, thereby make the judgement that whether needs all LED to cut off simultaneously or reduce LED input current, to meet the requirement of relevant laws and regulations.Meanwhile, the control end to each LED, has all increased current measurement point, to the electric current of LED is carried out to collection analysis on the spot.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 is power module schematic diagram of the present invention.
Fig. 3 is protective circuit module principle figure of the present invention.
Fig. 4 is pwm signal generation module schematic diagram of the present invention.
Fig. 5 is current regulating module schematic diagram of the present invention.
Fig. 6 is fault diagnosis module schematic diagram of the present invention.
Fig. 7 is that software of the present invention is realized schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, be convenient to be well understood to the present invention, but they do not form restriction to the present invention.
As shown in Figure 1, the present invention includes protective circuit module 1, power module 2, pwm signal generation module 3, current regulating module 4, fault diagnosis module 5 and LED lamp 6.
Protective circuit module as shown in Figure 2; its circuit formation comprises: capacitor C 1, C2 and C3; resistance R 1, R2; and voltage-stabiliser tube D1, D2; wherein capacitor C 1 is connected with voltage-stabiliser tube D1 with after resistance R 1 parallel connection; after capacitor C 2 is in parallel with resistance R 2, connect with voltage-stabiliser tube D2, voltage-stabiliser tube D1 is connected capacitor C 3, LED lamp anode and power module input with voltage-stabiliser tube D2 negative electrode.Its Main Function is the high and low frequency signal in input signal to carry out filtering processing, for whole circuit provides more stable input voltage, and guarantees the Electro Magnetic Compatibility of whole circuit.The input of this protective circuit is from the control information (as position lamp and daytime running lamps etc.) of two difference in functionality input signal A, B of vehicle body, and input becomes a road control signal, is connected with the anode of LED.On the input signal of B, set up a signal measurement point, for the state of system judgement B, and then provide suitable pwm control signal.On the holding wire of output, can also provide signal source for other modules, for helping to judge the output state of car load.
Power module as shown in Figure 3, its circuit formation comprises: with voltage-regulation chip U1, triode T1 and the triode T2 of 8 PIN pins, voltage-regulation chip, triode T1 and triode T2 are connected to form negative-feedback circuit, finely tune when unstable to input state.Described voltage-regulation chip U1 output pin VS connects pwm signal module, and the collector electrode of triode T1 connects the voltage-stabiliser tube D2 negative electrode in protective circuit module.In negative-feedback circuit, triode T1 emitter connects the voltage output end pin VOUT of voltage-regulation chip U1, triode T1 base stage connecting triode T2 collector electrode, triode T2 base stage connects voltage-regulation chip reference voltage pin REF, between described triode T1 and voltage-regulation chip U1, be also provided with capacitor C 4 and resistance R 4, capacitor C 4 and resistance R 4 series connection, resistance R 4 one end ground connection, capacitor C 4 and resistance R 4 strobe, and prevent that in circuit, larger fluctuation appears in voltage.Other pins of voltage-regulation chip are in this example all in vacant state.Power module purposes provides the input power matching for whole circuit, because the voltage of inputting from car load is generally between 12 to 14 volts, and the driving voltage of single-chip microcomputer is generally in 5V left and right, and voltage request is stable, therefore, must add this power module to provide input power for single-chip microcomputer, the VS end of voltage-regulation chip is voltage output end, now the voltage constant of output, meets the input voltage requirement of the chip of programming in Fig. 4.
As shown in Figure 4, its circuit formation comprises pwm signal generation module: with mcu programming chip, temperature sensing circuit, triode T3, the triode T4 of 8 PIN pins.Programming chip model is PIC12F683, and operating voltage is 5V, pin wherein: the operating voltage that vdd terminal is chip; VSS holds ground connection; VPP end is the program voltage end of chip, is connected with one of them the input signal B end from vehicle body, receives extraneous programming signal; CLKIN end is for exporting pwm control signal to the external world, because this output signal is fainter, in circuit, increased the triode T4 of common emitter, to drive the base stage of triode T3, impel the conducting of triode T3 collector and emitter, corresponding pwm control signal is provided then to the driving of current regulating module this signal amplification; CLKOUT end is for collecting the LED failure diagnosis information transmitting in the external world, in circuit, increase and have capacitor C 12 and resistance R 5 earthed circuits, for filtering, and the larger distortion of anti-stop signal appearance, according to the rules and regulations of GB or ECE, for automobile-used signal or illumination LED circuit design, when in system, losing efficacy appears in a LEDs or a string LED, other all LED should still can meet the requirement of luminous intensity distribution.Therefore, if there is a certain or certain a string LED inefficacy in circuit, now, and the coherent signal transmitting according to fault signal circuit, chip can be made the order of whether turn-offing other LED, and controls by the output of pwm signal end; ICSPDAT end is for receiving the extraneous voltage signal relevant with LED temperature, and in this circuit, RP1 is temperature sensitive resister, and when on pcb board, the temperature of LED lamp is normal, resistance R 9 and temperature sensitive resister RP1 arrive balance, and now this chip obtains a low level; When on pcb board, LED light temperature is too high, it is large that temperature sensitive resister RP1 resistance becomes, between temperature sensitive resister RP1 and resistance R 9, resistance is not etc., electromotive force disequilibrium, ICSPDAT pin obtains a high level, now system can be passed through PWM output pin, and the electric current of LED lamp is suitably controlled, and the temperature of pcb board is controlled in rational scope; ICSPCLK end is for receiving the adapt voltages signal of being sent here by voltage regulator, before entering chip, system parallel connection capacitor C 14 and resistance R 12, incoming telephone signal is carried out to filtering processing, make input signal more stable; COUT end is unsettled.
Keep the current regulating module of LED current constant as shown in Figure 5, its minimum system forms: mirror-image constant flow source Q1, field-effect transistor T8, triode T7, wherein resistance R 13, resistance R 14 form the pull-up resistor of mirror image constant source, the current signal of output are converted to the input voltage signal of the grid of field-effect transistor T8.When pwm signal provides a high level through VCC_SWITCH, the grid of metal-oxide-semiconductor is high level, and metal-oxide-semiconductor source electrode and drain electrode are connected, and now LED negative electrode is connected with ground, and LED is luminous.In this modular circuit, the access of triode T7 base stage, from one of them input signal B of vehicle body, inputs control switch passage by B, an input instruction is provided to mirror-image constant flow source Q1.
Fault diagnosis module is connected as shown in Figure 6 with LED lamp, fault diagnosis module comprises a plurality of electric capacity of series connection, each electric capacity is in parallel with each LEDs respectively, electric capacity one end in parallel with LED lamp tail end is also provided with diode D5 in parallel and capacitor C 24, the CLKOUT pin of diode D5 anodic bonding programming chip.If LED normal operation, the rated voltage of each LEDs is 3V, the anode of supposing again LED is input as 13.5V, the applied signal voltage size that is vehicle body end is 13.5V, so, connect after three LEDs, the common cathode electromotive force of LED lamp should be 4.5V(13.5-9) V, now fault diagnosis module output FAILURE end should be high level.Suppose that losing efficacy appears in a certain LED fluorescent tube, in series loop, no current flows through, now the negative electrode of LED lamp (LED-) is still connected by the field-effect transistor T8 in Fig. 5, so time LED lamp cathode voltage should be 0V, now FAILURE end output signal is low level.This signal communicates with the CLCOUT end pin in Fig. 4, judges whether the signal that needs output to allow all LED extinguish for help system.
As shown in Fig. 1-7, the input of the two-way of vehicle body A, B are all from the access of protective circuit input, and when mirror-image constant flow source Q1 driven LED, now the signal of B_INFO input point is high level (switch of corresponding vehicle body end function B closes).Then pass through the signal of judgement VCC_SWITCH, and this signal is relevant with PWM, if PWM is output as 1, according to the drive circuit in Fig. 4, VCC_SWITCH opens, and is high level.In the driver module of LED, mirror current source Q1 negative pole is connected, the anodal field-effect transistor T8 that drives, and now LED negative electrode is connected, and LED lamp is luminous.Under this pattern, the duty ratio based on a kind of function signal during the duty ratio of PWM output.If B_INFO is low level, according to the protective circuit module in Fig. 2, now another function A opens, and corresponding, PWM just need to export the duty cycle signals of another function.
Aspect the realizing of software, adopted the progressively mode of judgement to realize, after singlechip chip powers on, software starts scanning port.When function A or function B open, now software is carried out delay procedure, eliminates the impact of vibration noise.Then read the voltage of LED failure diagnosis port, then whether judgement voltage is now less than 10mA (notes: when the electric current in LED control circuit main road is less than 10mA, now system thinks in circuit that a certain paths of LEDs breaks down and disconnects), if be less than 10mA, the signal that now single-chip microcomputer is 0 to duty ratio of PWM, disconnects other all circuit.Otherwise, continue executive program.Then judge whether the end-point voltage of thermistor reaches the high level voltage of single-chip microcomputer and (note: in Fig. 4, resistance R 9 and warming resistance R P1 form a bridge circuit, this circuit is used for judging that whether the temperature of LED is too high), if be now high level, the joint temperature of corresponding LED is too high, now PWM will export a duty ratio more smaller than normal value, thereby reduces the input current of LED, reaches the object of controlling LED temperature.If the joint temperature of LED is in normal scope, the value that now PWM exports is duty ratio under normal circumstances.
In this LED drive circuit; the realization of two kinds of different duty (the LED brightness of corresponding two kinds of different car light functions); mainly to judge by any road input in protective circuit module input signal; the low and high level of its judgement represents that respectively whether this function is opened, and exports different duty ratios then.And the determining of the duty ratio of two kinds of functions, have two kinds of difference in functionalitys respectively corresponding light distribution requirements determine.Under the prerequisite of satisfied light distribution requirements separately, determine after duty ratio, by software programming in the programming chip at Fig. 4, thereby realize required LED brightness.
The content not being described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (8)
1. a difunctional LED drive circuit, it is characterized in that: comprise the protective circuit module being connected with vehicle body two-way input signal, power module, fault diagnosis module, LED lamp, and respectively with vehicle body pwm signal generation module and current regulating module that wherein a road input signal is connected, described protective circuit module, power module, pwm signal generation module, current regulating module is electrically connected to successively, the output of described protective circuit module and the output of current regulating module are connected respectively anode and the negative electrode of LED lamp, described fault diagnosis module input is connected with LED lamp cathode, output connects pwm signal generation module.
2. difunctional LED drive circuit according to claim 1; it is characterized in that: described protective circuit module comprises capacitor C 1, capacitor C 2, capacitor C 3, resistance R 1, resistance R 2, voltage-stabiliser tube D1 and voltage-stabiliser tube D2; after described capacitor C 1 is in parallel with resistance R 1, connect with voltage-stabiliser tube D1; after described capacitor C 2 is in parallel with resistance R 2, connect with voltage-stabiliser tube D2, described voltage-stabiliser tube D1 is connected capacitor C 3, LED lamp anode and power module input with voltage-stabiliser tube D2 negative electrode.
3. difunctional LED drive circuit according to claim 2; it is characterized in that: described power module comprises voltage-regulation chip, triode T1 and triode T2; described voltage-regulation chip, triode T1 and triode T2 are connected to form negative-feedback circuit; described voltage-regulation chip output pin connects pwm signal module, and the collector electrode of triode T1 connects the voltage-stabiliser tube D2 negative electrode in protective circuit module.
4. difunctional LED drive circuit according to claim 3, it is characterized in that: in described negative-feedback circuit, triode T1 emitter connects the voltage output end pin of voltage-regulation chip, triode T1 base stage connecting triode T2 collector electrode, triode T2 base stage connects voltage-regulation chip reference voltage pin, between described triode T1 and voltage-regulation chip, be also provided with capacitor C 4 and resistance R 4, capacitor C 4 and resistance R 4 series connection, resistance R 4 one end ground connection.
5. difunctional LED drive circuit according to claim 3, it is characterized in that: described pwm signal generation module comprises programming chip, temperature sensing circuit, triode T3, triode T4, the CLKIN pin connecting triode T3 base stage of described programming chip, triode T3 collector electrode connecting triode T4 base stage, triode T4 collector electrode connects current regulating module, described programming chip IC SPDAT pin connects temperature sensing circuit output, described programming chip IC SPCLK pin connects the output pin of voltage-regulation chip, described programming chip CLKOUT pin connects fault diagnosis module output.
6. difunctional LED drive circuit according to claim 5, it is characterized in that: described temperature sensing circuit comprises resistance R 9 and the warming resistance R P1 of series connection, described resistance R 9 one end connect power supply, between described programming chip IC SPDAT pin contact resistance R9 and warming resistance R P1.
7. difunctional LED drive circuit according to claim 5, it is characterized in that: described current regulating module comprises mirror-image constant flow source Q1, triode T7 and field-effect transistor T8, described mirror-image constant flow source Q1 positive pole is connected pwm signal generation module, by field-effect transistor T8, is connected LED lamp cathode, described mirror-image constant flow source Q1 negative pole connecting triode T7 collector electrode simultaneously by resistance.
8. difunctional LED drive circuit according to claim 5, it is characterized in that: described fault diagnosis module comprises a plurality of electric capacity of series connection, each electric capacity is in parallel with one of them LED of LED lamp respectively, electric capacity one end in parallel with LED lamp tail end is also provided with diode D5 in parallel and capacitor C 24, the CLKOUT pin of diode D5 anodic bonding programming chip.
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| CN106793319A (en) * | 2016-12-30 | 2017-05-31 | 上海小糸车灯有限公司 | A kind of LED failure cut-off method that can reduce quiescent current |
| CN106849707A (en) * | 2016-11-28 | 2017-06-13 | 中核核电运行管理有限公司 | The high-performance high-voltage power module that a kind of nuclear power station reactor core Nuclear measurement system is used |
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| CN108093506A (en) * | 2016-11-23 | 2018-05-29 | 常州星宇车灯股份有限公司 | A kind of daytime running lights and the LED drive circuit of position lamp multiplexing |
| CN108668412A (en) * | 2018-06-14 | 2018-10-16 | 上汽大众汽车有限公司 | Meet the LED lamp areas the current feedback brightness BIN compensation circuit of vehicle body diagnosis |
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| CN108093506B (en) * | 2016-11-23 | 2024-04-19 | 常州星宇车灯股份有限公司 | LED drive circuit for multiplexing daytime running light and position light |
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| CN106849707A (en) * | 2016-11-28 | 2017-06-13 | 中核核电运行管理有限公司 | The high-performance high-voltage power module that a kind of nuclear power station reactor core Nuclear measurement system is used |
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| CN108668412A (en) * | 2018-06-14 | 2018-10-16 | 上汽大众汽车有限公司 | Meet the LED lamp areas the current feedback brightness BIN compensation circuit of vehicle body diagnosis |
| CN108668412B (en) * | 2018-06-14 | 2023-05-23 | 上汽大众汽车有限公司 | Current feedback type brightness BIN area compensation circuit for LED lamp meeting vehicle body diagnosis |
| CN109041344A (en) * | 2018-08-04 | 2018-12-18 | 天津工大海宇照明部品有限公司 | A kind of side LED steering side-marker lamp illuminator with high pressure turn-off function |
| CN109782565A (en) * | 2018-12-31 | 2019-05-21 | 珠海莱坦科技有限公司 | Current mirror laser projection circuit and laser projection clock |
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| Publication number | Publication date |
|---|---|
| CN103561527B (en) | 2015-09-09 |
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