CN103561527B - A kind of dual-function LED drive circuit - Google Patents
A kind of dual-function LED drive circuit Download PDFInfo
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- CN103561527B CN103561527B CN201310581003.4A CN201310581003A CN103561527B CN 103561527 B CN103561527 B CN 103561527B CN 201310581003 A CN201310581003 A CN 201310581003A CN 103561527 B CN103561527 B CN 103561527B
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Abstract
The invention belongs to automobile lamp technical field, be specifically related to a kind of dual-function LED drive circuit.It comprises protective circuit module, power module, pwm signal generation module, current regulating module, fault diagnosis module and LED; described protective circuit module, power module, pwm signal generation module, current regulating module are electrically connected successively; the output of described protective circuit module is connected anode and the negative electrode of LED respectively with the output of current regulating module, and described fault diagnosis module input is connected with LED negative electrode, output connects pwm signal generation module.LED drive circuit of the present invention adopts PWM to control, and in the drive circuit of LED, have employed constant-current source carry out controlling filed effect transistor, make the current constant flowing through LED, ensure uniformity and the stability of the brightness of LED, the light that logical a string LED sends two kinds of different brightness is realized by this kind of drive circuit, can LED light source quantity on effective less vehicle body, increase the space availability ratio of vehicle body.
Description
Technical field
The invention belongs to automobile lamp technical field, be specifically related to a kind of dual-function LED drive circuit, espespecially realize difunctional by single led light source, and the drive circuit of plurality of LEDs uniformity of luminance and low heat-resisting risk can be ensured.
Background technology
In the design of current LED car lamp signal lighting circuit, when realizing a certain car light function by plurality of LEDs, all require higher to the consistency of LED luminance and the parameter such as photochromic.Traditional LED drive circuit normally realizes single function with single light source, and the control of its brightness is usually adopted resistive structure or realized by digital dimming or simulation light modulation.Resistive structure is controlled to the mode of brightness, when fluctuation appears in the electric current of input power, the brightness of LED will change, and does not meet the conforming requirement of car light LED luminance; To simulation light modulation, the principle of its light modulation is the size directly regulating 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, namely PWM controls, and because its principle controlled keeps the current constant of LED, change the duration of LED power-on time in the unit interval, namely duty ratio realizes, and thus it photochromicly can not change, and meets designing requirement.And when adopting PWM control LED, usually just adopt the light source of single LED to realize single function, concerning the car light needing to realize several functions, just need multiple LED light source, and on vehicle body, LED light source is more, its geometric space taken is more, is unfavorable for vehicle requirement handsome in appearance.
Summary of the invention
Object of the present invention is exactly the deficiency existed to solve above-mentioned background technology, provides a kind of dual-function LED drive circuit.
The technical solution used in the present invention is: a kind of dual-function LED drive circuit, comprise the protective circuit module be connected with vehicle body two-way input signal, power module, fault diagnosis module, LED, and respectively with the vehicle body wherein pwm signal generation module that is connected of a road input signal and current regulating module, described protective circuit module, power module, pwm signal generation module, current regulating module is electrically connected successively, the output of described protective circuit module is connected anode and the negative electrode of LED respectively with the output of current regulating module, described fault diagnosis module input is connected with LED negative electrode, output connects pwm signal generation module, described vehicle body two-way input signal is after the access of protective circuit module input, and one end connects LED anode, and one end connects power module, and described power module is that pwm signal generation module is powered, the low and high level of described current regulating module to any road input signal in vehicle body two-way input signal judges, pwm signal generation module exports two kinds of different duty ratios respectively according to the low and high level of input signal, be connected with LED negative electrode after being regulated by current regulating module, realize two kinds of different function brightness.
Further; described protective circuit module comprises electric capacity C1, electric capacity C2, electric capacity C3, resistance R1, resistance R2, voltage-stabiliser tube D1 and voltage-stabiliser tube D2; described electric capacity C1 connects with voltage-stabiliser tube D1 with after resistance R1 parallel connection; described electric capacity C2 connects with voltage-stabiliser tube D2 with after resistance R2 parallel connection, and described voltage-stabiliser tube D1 is connected electric capacity C3, LED 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 is connected to form negative-feedback circuit, described voltage-regulation chip output pin connects pwm signal generation module, the base stage of the RES pin connecting triode T2 of voltage-regulation chip, the grounded emitter of triode T2, the base stage of the collector electrode connecting triode T1 of triode T2, the emitter of triode T1 connects the VOUT pin of voltage-regulation chip, 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, electric capacity C4 and resistance R4 is also provided with between described triode T1 and voltage-regulation chip, electric capacity C4 and resistance R4 connects, resistance R4 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 T4 base stage of described programming chip, triode T4 collector electrode connecting triode T3 base stage, triode T3 collector electrode connects current regulating module, described programming chip IC SPDAT pin connects temperature sensing circuit output, and described programming chip IC SPCLK pin connects the output pin of voltage-regulation chip.
Further, described temperature sensing circuit comprises resistance R9 and the warming resistance RP1 of series connection, and described resistance R9 one end connects power supply, between described programming chip IC SPDAT pin contact resistance R9 and warming resistance RP1.
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 resistance, is connected LED negative electrode by field-effect transistor T8, described mirror-image constant flow source Q1 negative pole connecting triode T7 collector electrode simultaneously.
Further, described fault diagnosis module comprises multiple electric capacity of series connection, each electric capacity is in parallel with one of them fluorescent tube of LED respectively, electric capacity one end in parallel with LED tail end fluorescent tube is also provided with the CLKOUT pin of diode D5 in parallel and electric capacity C24, diode D5 anode connection programming chip.
LED drive circuit of the present invention adopts PWM to control, and in the drive circuit of LED, have employed constant-current source carry out controlling filed effect transistor, make the current constant flowing through LED, ensure uniformity and the stability of the brightness of LED, the light that a string LED sends two kinds of different brightness is realized by this kind of drive circuit, can LED light source quantity on effective less vehicle body, increase the space availability ratio of vehicle body, better realize the moulding intention of hairstylist.Wherein pwm signal generation module, 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 meeting LED technology specification, the uniformity of luminance of the LED in whole circuit is guaranteed to the negative electrode of LED.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, thus make the need of all LED being cut off or reduces the judgement of LED input current simultaneously, to meet the requirement of relevant laws and regulations.Meanwhile, to the control end of each LED, both increase current measurement point, to carry out collection analysis on the spot to the electric current of LED.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 is protective circuit module principle figure of the present invention.
Fig. 3 is power module schematic diagram 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 software simulating schematic diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, is 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 6.
Protective circuit module as shown in Figure 2; its circuit formation comprises: electric capacity C1, C2 and C3; resistance R1, R2; and voltage-stabiliser tube D1, D2; wherein electric capacity C1 connects with voltage-stabiliser tube D1 with after resistance R1 parallel connection; electric capacity C2 connects with voltage-stabiliser tube D2 with after resistance R2 parallel connection, and voltage-stabiliser tube D1 is connected electric capacity C3, LED anode and power module input with voltage-stabiliser tube D2 negative electrode.Its Main Function is to carry out filtering process to the high and low frequency signal in input signal, for whole circuit provides more stable input voltage, and ensures the Electro Magnetic Compatibility of whole circuit.The input of this protective circuit, from the control information (as position lamp and daytime running lamps etc.) of two difference in functionality input signals A, B of vehicle body, inputs and becomes a road control signal, be connected with the anode of LED.On the input signal of B, set up a signal measurement point, judged the state of B for system, and then suitable pwm control signal is provided.On the holding wire exported, signal source can also be provided for other modules, for helping the output state judging car load.
Power module as shown in Figure 3, its circuit formation comprises: voltage-regulation chip U1, the triode T1 of band 8 PIN pins and triode T2, voltage-regulation chip, triode T1 and triode T2 are connected to form negative-feedback circuit, for finely tuning time 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, electric capacity C4 and resistance R4 is also provided with between described triode T1 and voltage-regulation chip U1, electric capacity C4 and resistance R4 connects, resistance R4 one end ground connection, electric capacity C4 and resistance R4 strobes, and prevents voltage in circuit from occurring larger fluctuation.Other pins of voltage-regulation chip are all in vacant state in this example.Power module purposes provides the input power matched for whole circuit, because the voltage inputted from car load is generally between 12 to 14 volts, and the driving voltage of single-chip microcomputer is generally at about 5V, and voltage request is stablized, therefore, must add this power module for single-chip microcomputer provides input power, and the VS end of voltage-regulation chip is voltage output end, the voltage constant now exported, meets in Fig. 4 the input voltage requirement of chip of programming.
As shown in Figure 4, its circuit formation comprises pwm signal generation module: mcu programming chip, temperature sensing circuit, triode T3, the triode T4 of band 8 PIN pins.Programming chip model is PIC12F683, and operating voltage is 5V, pin wherein: vdd terminal is the operating voltage of chip; VSS holds ground connection; VPP end is the program voltage end of chip, holds be connected with one of them input signal B from vehicle body, receives extraneous programming signal; CLKIN end is used for outwardly exporting pwm control signal, because this output signal is fainter, add the triode T4 of common emitter in circuit, to drive the base stage of triode T3, impel the conducting of triode T3 collector and emitter, then amplified by this signal provides corresponding pwm control signal to the driving of current regulating module; CLKOUT end is for collecting the LED failure diagnosis information transmitted in the external world, in circuit, increase and have electric capacity C12 and resistance R5 earthed circuit, for filtering, and there is larger distortion in anti-stop signal, according to the rules and regulations of GB or ECE, for automobile-used signal or illumination LED circuit design, when losing efficacy appears in a LEDs in system or a string LED, other all LED still should can meet the requirement of luminous intensity distribution.Therefore, if there is a certain or certain a string LED inefficacy in circuit, now, according to the coherent signal that fault signal circuit transmits, chip can make the order whether turning off other LED, and is controlled by the output of pwm signal end; ICSPDAT end is for receiving the extraneous voltage signal relevant with LED temperature, and in the circuit, RP1 is temperature sensitive resister, and when on pcb board, the temperature of LED is normal, resistance R9 and temperature sensitive resister RP1 arrives balance, and now this chip obtains a low level; When on pcb board, LED temperature is too high, temperature sensitive resister RP1 resistance becomes large, between temperature sensitive resister RP1 and resistance R9, resistance is not etc., electromotive force disequilibrium, ICSPDAT pin obtains a high level, now system can pass through PWM output pin, suitably controls the electric current of LED, makes the temperature of pcb board control in rational scope; ICSPCLK end is for receiving the adapt voltages signal sent here by voltage regulator, and before entering chip, system is in parallel electric capacity C14 and resistance R12, carries out filtering process to incoming telephone signal, make input signal more stable; COUT end is unsettled.
Keep the constant current regulating module of LED current as shown in Figure 5, its minimum system is formed: mirror-image constant flow source Q1, field-effect transistor T8, triode T7, wherein resistance R13, resistance R14 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 is from one of them input signal B of vehicle body, inputs control switch passage by B, provides one to input instruction to mirror-image constant flow source Q1.
The connection of fault diagnosis module and LED as shown in Figure 6, fault diagnosis module comprises multiple electric capacity of series connection, each electric capacity is in parallel with each LEDs respectively, electric capacity one end in parallel with LED tail end is also provided with the CLKOUT pin of diode D5 in parallel and electric capacity C24, diode D5 anode connection programming chip.If LED normally works, then the rated voltage of each LEDs is 3V, suppose that the anode of LED is input as 13.5V again, namely the applied signal voltage size of vehicle body end is 13.5V, so, connect after three LEDs, the common cathode electromotive force of LED should be 4.5V (13.5-9) V, and now fault diagnosis module output FAILURE end should be high level.Suppose that losing efficacy appears in a certain LED lamp tube, in series loop, no current flows through, now the negative electrode (LED-) of LED is still connected by the field-effect transistor T8 in Fig. 5, so time LED cathode voltage should be 0V, now FAILURE end output signal is low level.This signal and the CLCOUT in Fig. 4 hold pin to communicate, and judge whether to need to export the signal allowing all LED extinguish for help system.
As shown in figs. 1-7, two-way input A, B of vehicle body 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 by judging the signal of VCC_SWITCH, and this signal is relevant with PWM, if it is 1 that PWM exports, according to the drive circuit in Fig. 4, then VCC_SWITCH opens, and is high level.In the driver module of LED, mirror current source Q1 negative pole is connected, and positive pole drives field-effect transistor T8, and now LED negative electrode is connected, and LED is luminous.In such a mode, the duty ratio that PWM exports is the duty ratio based on a kind of function signal.If B_INFO is low level, according to the protective circuit module in Fig. 2, now another function A opens, and accordingly, PWM just needs the duty cycle signals exporting another function.
In the realizing of software, have employed the mode progressively judged and realize, after singlechip chip powers on, software starts scanning port.When function A or function B opens, now software performs delay procedure, eliminates the impact of vibration noise.Then the voltage of LED failure diagnosis port is read, then judge whether voltage is now less than 10mA (note: when the electric current in LED control circuit main road is less than 10mA, now system thinks that a certain paths of LEDs breaks down and disconnects in circuit), if be less than 10mA, now single-chip microcomputer is the signal of 0 to PWM duty ratio, disconnects other all circuit.Otherwise, continue executive program.Then judge whether the end-point voltage of thermistor reaches the high level voltage (note: in Fig. 4 of single-chip microcomputer, resistance R9 and warming resistance RP1 forms 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 then corresponding LED is too high, now PWM is by duty ratio more smaller than normal value for output one, thus reduces the input current of LED, reaches the object of control 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 (LED luminance of corresponding two kinds of different car light functions) of two kinds of different duty; mainly by judging any road input in protective circuit module input signal; whether its low and high level judged represents this function respectively and opens, and then exports different duty ratios.And the determination of the duty ratio of two kinds of functions, there is two kinds of difference in functionalitys light distribution requirements corresponding respectively to determine.Under the prerequisite meeting respective light distribution requirements, after determining duty ratio, by software programming in the programming chip of Fig. 4, thus the LED luminance needed for realizing.
The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (8)
1. a dual-function LED drive circuit, it is characterized in that: comprise the protective circuit module be connected with vehicle body two-way input signal, power module, fault diagnosis module, LED, and respectively with the vehicle body wherein pwm signal generation module that is connected of a road input signal and current regulating module, described protective circuit module, power module, pwm signal generation module, current regulating module is electrically connected successively, the output of described protective circuit module is connected anode and the negative electrode of LED respectively with the output of current regulating module, described fault diagnosis module input is connected with LED negative electrode, output connects pwm signal generation module, described vehicle body two-way input signal is after the access of protective circuit module input, and one end connects LED anode, and one end connects power module, and described power module is that pwm signal generation module is powered, the low and high level of described current regulating module to any road input signal in vehicle body two-way input signal judges, pwm signal generation module exports two kinds of different duty ratios respectively according to the low and high level of input signal, be connected with LED negative electrode after being regulated by current regulating module, realize two kinds of different function brightness.
2. dual-function LED drive circuit according to claim 1; it is characterized in that: described protective circuit module comprises electric capacity C1, electric capacity C2, electric capacity C3, resistance R1, resistance R2, voltage-stabiliser tube D1 and voltage-stabiliser tube D2; described electric capacity C1 connects with voltage-stabiliser tube D1 with after resistance R1 parallel connection; described electric capacity C2 connects with voltage-stabiliser tube D2 with after resistance R2 parallel connection, and described voltage-stabiliser tube D1 is connected electric capacity C3, LED anode and power module input with voltage-stabiliser tube D2 negative electrode.
3. dual-function 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 is connected to form negative-feedback circuit, described voltage-regulation chip output pin connects pwm signal generation module, the base stage of the RES pin connecting triode T2 of voltage-regulation chip, the grounded emitter of triode T2, the base stage of the collector electrode connecting triode T1 of triode T2, the emitter of triode T1 connects the VOUT pin of voltage-regulation chip, the collector electrode of triode T1 connects the voltage-stabiliser tube D2 negative electrode in protective circuit module.
4. dual-function 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, electric capacity C4 and resistance R4 is also provided with between described triode T1 and voltage-regulation chip, electric capacity C4 and resistance R4 connects, resistance R4 one end ground connection.
5. dual-function 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 T4 base stage of described programming chip, triode T4 collector electrode connecting triode T3 base stage, triode T3 collector electrode connects current regulating module, described programming chip IC SPDAT pin connects temperature sensing circuit output, and described programming chip IC SPCLK pin connects the output pin of voltage-regulation chip.
6. dual-function LED drive circuit according to claim 5, it is characterized in that: described temperature sensing circuit comprises resistance R9 and the warming resistance RP1 of series connection, described resistance R9 one end connects power supply, between described programming chip IC SPDAT pin contact resistance R9 and warming resistance RP1.
7. dual-function LED drive circuit according to claim 1, 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 resistance, is connected LED negative electrode by field-effect transistor T8, described mirror-image constant flow source Q1 negative pole connecting triode T7 collector electrode simultaneously.
8. dual-function LED drive circuit according to claim 5, it is characterized in that: described fault diagnosis module comprises multiple electric capacity of series connection, each electric capacity is in parallel with one of them LED of LED respectively, electric capacity one end in parallel with LED tail end is also provided with the CLKOUT pin of diode D5 in parallel and electric capacity C24, diode D5 anode connection programming chip.
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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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