CN101815382A - Step-down constant current LED drive circuit for automobile lighting - Google Patents
Step-down constant current LED drive circuit for automobile lighting Download PDFInfo
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- CN101815382A CN101815382A CN 201010138214 CN201010138214A CN101815382A CN 101815382 A CN101815382 A CN 101815382A CN 201010138214 CN201010138214 CN 201010138214 CN 201010138214 A CN201010138214 A CN 201010138214A CN 101815382 A CN101815382 A CN 101815382A
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Abstract
The invention relates to a step-down constant current LED drive circuit for automobile lighting. The circuit comprises an isolating circuit module (1), wherein the input end of the isolating circuit module (1) is electrically connected with a power supply (8), and the output end of the isolating circuit module (1) is electrically connected with an MOS transistor drive circuit module (2) and a converting circuit module (3); a Vin terminal of a PWM control chip (6) is electrically connected with the power supply (8), and a Vout terminal of the PWM control chip (6) is electrically connected with the MOS transistor drive circuit module (2) and the converting circuit module (3); the output end of the converting circuit module (3) is connected with an LED lamp set (9); one end of a feedback circuit module (5) is connected with the output of the converting circuit module (3) and the LED lamp set (9), and the other end of the feedback circuit module (5) is connected with an FB terminal of the PWM control chip; and a protection circuit module (4) is arranged between an earth terminal of the LED lamp set (9) and an SCP terminal of the PWM control chip. The drive circuit of the invention not only make the LED emit light constantly, but also has a short-circuit protection function, high rate of qualified products and low cost.
Description
Technical field
The invention belongs to electric lighting field, is a kind of led drive circuit specifically, relates in particular to a kind of step-down constant current LED drive circuit for automobile lighting.
Background technology
At 20th century the mid-80, LED (Light Emitting Diodes, light-emitting diode) begins to be used to the high-mount stop lamp (CHMSL of automobile central authorities, Central High Mounted Stop Lamp), enter the nineties, automobile instrument LCD (Liquid Crystal Display, LCD) this solid-state new light sources of LED is generally adopted in the panel back lighting, after entering the new century, lifting with LED power and brightness, except car headlamp, LED has entered the application in automotive lighting and the signal system comprehensively.
LED has that response speed is fast, low-power consumption, energy-conservation, remarkable advantage such as the life-span is long.Owing to the rapid response speed of LED, be specially adapted to the application of automobile brake lamp and direction indicator lamp, can reduce the probability of happening of traffic accidents such as rear-end collision.Along with the raising of semi-conducting material and packaging technology, the luminous flux and the light extraction efficiency of led light source improve gradually, and led light source has been widely used in special lighting fields such as traffic lights, automotive lighting, billboard.The LED Driving technique is also progressively developed along with the development of LED application technology.
LED is a kind of along with the variation by the LED current value changes the well-illuminated light emitting source of light, and therefore LED is luminous constant if desired, and then necessary control flows is constant through the current value of LED.Usually the LED that is adopted drives the constant current method linear adjustable type and two kinds of methods of switch adjustable type.The core technology of linear regulation formula is to utilize the switching tube that works in the range of linearity to come control load as a dynamic adjustable resistance, to guarantee under the situation that input voltage changes, the power consumption that the switching tube load is different, thus the electric current that flows through the LED load is remained unchanged substantially.But this Driving technique not only is subjected to the restriction of input voltage range, and loss is very big, and efficient is very low, causes the heating problem of circuit board serious.And the switch adjustable type is that efficient is higher in the energy conversion, can reach more than 90% under the perfect condition.The core of this Driving technique is between the switching tube with quick break-make places input and exports, by regulating the mean value that break-make ratio (being duty ratio) is controlled output dc voltage, this average voltage is made of the square-wave pulse of adjustable-width, and the mean value of square-wave pulse is exactly VD.With the LC filter square-wave pulse is smoothed to the output of ripple-free direct current, its value equals the mean value of square-wave pulse.Whole switching circuit adopts negative feedback, and by detecting output voltage and controlling duty ratio in conjunction with negative feedback, regulated output voltage is not subjected to the influence of input voltage and load variations.At present, the switch adjustable type circuit of buck (BUCK), boost type (BOOST), step-down/up type (BUCK-BOOST) is widely used in domestic lighting and automotive lighting.
Buck (BUCK) circuit, be applicable to that output voltage is lower than the occasion of input voltage, though the gate driving of switch can not become bigger problem, when difficulty is driving N-metal-oxide-semiconductor, grid voltage is at least than the high 5V of input voltage, or more likely is to exceed 10V.But produce the voltage higher if desired, just need select the P-MOS pipe for use, like this as long as just can open grid level with moving to than input.But circuit topological structure at buck circuit, some do not have the PWM modulation chip of metal-oxide-semiconductor driving force can't the driven MOS pipe, if only use pull-up resistor to go to control the conducting of P-MOS pipe and end simply, can't make metal-oxide-semiconductor reach conducting completely and cut-off state, the switch abnormal condition of metal-oxide-semiconductor can influence the operate as normal of whole LED drive circuit.A universal method of driving grid is a gate drivers, but special-purpose grid drive chip price is higher relatively.
On the other hand, the LED driver module applies to the automobile lamp field, and situations such as often being short-circuited, opening circuit in production line or installation wiring process causes the inefficacy and the damage of whole LED driver module.
For the calorifics problem of great power LED, owing to can varying with temperature, the current value of LED changes, and when electric current was too high, temperature also increased thereupon, thereby influenced the useful life of great power LED.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of step-down constant current LED drive circuit for automobile lighting is provided; this drive circuit includes the metal-oxide-semiconductor drive circuit, can not only make LED luminous constant, and have short-circuit protection function; improve product percent of pass, lower product cost.
In order to solve the problems of the technologies described above; the invention provides a kind of step-down constant current LED drive circuit for automobile lighting; this circuit comprises the buffer circuit module; the buffer circuit module input is electrically connected with power supply; output is electrically connected with metal-oxide-semiconductor drive circuit module and translation circuit module; pwm chip Vin terminal is electrically connected with power supply; the Vout terminal is electrically connected with metal-oxide-semiconductor drive circuit module and translation circuit module; the output termination LED lamp group of translation circuit module; one end of feedback circuit module connects the output and the LED lamp group of translation circuit module, and the other end connects pwm chip FB terminal; between LED lamp group earth terminal and pwm chip SCP terminal, also be provided with the protective circuit module.
According to drive circuit of the present invention, be preferably described metal-oxide-semiconductor drive circuit module and can export a voltage of enough opening or close metal-oxide-semiconductor grid, voltage between source electrodes difference.Described metal-oxide-semiconductor drive circuit module is by metal-oxide-semiconductor Q3, resistance R 2, NPN triode Q1, diode D3, capacitor C 6, divider resistance R3, R4 forms, wherein the output end vo ut of PWM chip 6 is through divider resistance R4 and R3, C6 connects, diode D3 is connected across between C6 and the R3, the negative pole of D3 is connected to the base stage of triode Q1, the positive pole of D2 is connected to the emitter of triode Q1, resistance R 2 is connected in parallel between the collector and emitter of triode Q3, the emitter of Q1 is connected to the grid of metal-oxide-semiconductor Q3 simultaneously, the collector electrode of Q1 is connected to the source electrode of metal-oxide-semiconductor Q3, and the drain electrode of metal-oxide-semiconductor Q3 connects the translation circuit module.
According to drive circuit of the present invention, be preferably described protective circuit module by resistance R 10, R11, R12, R13, R14, R25, R26, NPN triode Q4, Q5 and metal-oxide-semiconductor Q2 form; Metal-oxide-semiconductor Q2 is connected in the led array string, the drain electrode of metal-oxide-semiconductor Q2 connects the negative pole of LED lamp group, the Q2 source ground, the output of the grid of Q2 connect respectively resistance R 11 to ground be connected the output of resistance R 10 to translation circuit, the grid of Q2 is connected to the collector electrode of NPN triode Q4 simultaneously, the grounded emitter of Q4, base stage connects resistance R 13, connects the SCP pin of current-limiting resistance R14 to PWM chip again; The negative pole of led array is connected directly in the middle of R13, the R14 simultaneously, and the positive pole of led array is drawn and connected divider resistance R12, R26, through the base stage of current-limiting resistance R25 connection triode Q5, and the grounded emitter of Q5, collector electrode is connected to the grid of metal-oxide-semiconductor Q2.
According to drive circuit of the present invention, being preferably described feedback circuit module is the Voltage Feedback mononuclear type, sampling resistor Rsns is connected in the led array string, utilization flow through led array electric current also equal flow through sampling resistor, by measuring the voltage at sampling resistor R7, R8, R9 two ends, and this voltage difference is amplified the feedback end FB that feeds back to pwm chip 6.
According to drive circuit of the present invention, be preferably the thermistor PTC that in the current supply circuit of led array, is in series with a positive temperature coefficient.
The external PWM chip output of metal-oxide-semiconductor drive circuit module utilizes the multiplication of voltage principle to make the external metal-oxide-semiconductor of PWM chip be operated in complete conducting cut-off state but not half conducting half cut-off state in the step-down constant current LED drive circuit for automobile lighting of the present invention.The protective circuit module is utilized the SCP short-circuit protection pin function of PWM chip, and (drawn high to greater than 1V the time when the SCP pin, chip quits work automatically, will export shutoff, i.e. Vout=0.): when the load led array by short circuit; when perhaps the positive and negative terminal of load led array is by the positive and negative terminal short circuit of power supply; can turn-off the PWM chip in real time, and utilize transistorized switch combination effect that protection whole LED drive circuit and load LED are blocked in the flow through loop of LED of electric current.This protective circuit has increased the metal-oxide-semiconductor driving force of switching regulator regulating circuit on the one hand, has reduced circuit cost under the situation of not using metal-oxide-semiconductor specialty chip for driving; On the other hand, increased the protective circuit of whole LED drive circuit and load LED.In the automobile application; solved the problem of 60 seconds short circuit tests that require in the automotive electronics standard fully; simultaneously also protective effect has been played in the caused short circuit of the misoperation in the production process, reduced the probability that produces waste product in producing, improved product percent of pass and production efficiency.They are three years old, described led drive circuit has the feedback module that utilizes Voltage Feedback monocycle realization constant current function, this feedback module need not the dicyclo pwm chip of working voltage feedback loop and current feedback ring, voltage monocycle feedback chip has bigger price advantage compared to electric current and voltage dicyclo feedback chip, greatly reduces the components and parts cost of led drive circuit.Its four, the semistor PTC in this led drive circuit can realize overheat protector to circuit: when temperature raises, be connected on that the PTC resistance increases rapidly in the major loop, thereby reduced to export to the electric current of LED.
Description of drawings
Fig. 1 is the module diagram of step-down constant current LED drive circuit for automobile lighting of the present invention;
Accompanying drawing 2 is the circuit diagram of step-down constant current LED drive circuit for automobile lighting of the present invention.
Illustration in the accompanying drawing:
C1～C19 is an electric capacity; R1～R26 is a resistance; D1 is the TVS pipe; D2, D3, D5 are that diode, D4 are Schottky tube; Z1, Z2 are voltage-stabiliser tube; L1, L2 are inductance; Q1, Q4, Q5 are that NPN triode, Q2 are that N-MOS pipe, Q3 are the P-MOS pipe; 6 is pwm chip; U2A is an operational amplifier.
Embodiment
Below, for a more detailed description to the present invention in conjunction with the accompanying drawings with embodiment.These embodiment only are the descriptions to best mode for carrying out the invention, scope of the present invention are not had any restriction.
Embodiment
As shown in Figure 1, a kind of step-down constant current LED drive circuit for automobile lighting includes: buffer circuit module 1, metal-oxide-semiconductor drive circuit module 2, translation circuit module 3, pwm chip 6 (the chip model of employing is the TL5001 family chip of TI company of Texas Instrument), feedback circuit module 5 and protective circuit module 4 are formed; Automobile supplies power to buffer circuit module 1 with DC power supply 12V by anti-reverse diode D2, export the metal-oxide-semiconductor drive circuit to through buffer circuit module 1 filtered signal, give the grid of enough open and close of metal-oxide-semiconductor Q3, source voltage is poor, pwm chip 6 output square-wave pulse signals are to the switching of metal-oxide-semiconductor Q3 control metal-oxide-semiconductor Q3 simultaneously, the switching duty ratio of metal-oxide-semiconductor Q3 is removed the energy of control change circuit, translation circuit converts the 12VDC step-down of importing to be lower than 12V voltage and exports to the led array group, it (is the R7 in the accompanying drawing 2 that led array group upper end is in series with sampling resistor Rsns, R8, R9), pressure reduction by sampling Rsns two ends, operational amplifier U2A through feedback circuit module 5, export the output Vout of the feedback pin FB of pwm chip 6 to control pwm chip 6, indirect regulation the switching duty of metal-oxide-semiconductor Q3 recently reach the output energy of control change circuit, thereby reach the purpose of output constant current to the led array group.
In this led drive circuit, metal-oxide-semiconductor drive circuit module 2 is made up of metal-oxide-semiconductor Q3, resistance R 2, NPN triode Q1, diode D3, capacitor C 6, divider resistance R3, R4, as shown in Figure 2; Wherein the output end vo ut of PWM chip 6 is connected with R3, C6 through divider resistance R4, diode D3 is connected across between C6 and the R3, the negative pole of D3 is connected to the base stage of triode Q1, the positive pole of D2 is connected to the emitter of triode Q1, resistance R 2 is connected in parallel between the collector and emitter of triode Q3, the emitter of Q1 is connected to the grid of metal-oxide-semiconductor Q3 simultaneously, and the collector electrode of Q1 is connected to the source electrode of metal-oxide-semiconductor Q3, and the drain electrode of metal-oxide-semiconductor Q3 connects translation circuit module 3.
In this led drive circuit, sample circuit is connected on sampling resistor R7, R8, R9 in the led array group string road referring to accompanying drawing 2, the voltage difference at sampling resistor two ends is gathered out the positive and negative input that exports operational amplifier U2A to.
In this led drive circuit, protective circuit module 4 is by resistance R 10, R11, R12, R13, R14, R25, R26, and NPN triode Q4, Q5 and metal-oxide-semiconductor Q2 form; Metal-oxide-semiconductor Q2 is connected in the led array string, the drain electrode of metal-oxide-semiconductor Q2 connects the negative pole of LED lamp group, the Q2 source ground, the output of the grid of Q2 connect respectively resistance R 11 to ground be connected the output of resistance R 10 to translation circuit, the grid of Q2 is connected to the collector electrode of NPN triode Q4 simultaneously, the grounded emitter of Q4, base stage connect a resistance R 13, connect the SCP pin of current-limiting resistance R14 to PWM chip again; The negative pole of led array is connected directly in the middle of R13, the R14 simultaneously, and the positive pole of led array is drawn and connected divider resistance R12, R26, through the base stage of current-limiting resistance R25 connection triode Q5, and the grounded emitter of Q5, collector electrode is connected to the grid of metal-oxide-semiconductor Q2.
In this led drive circuit, thermal-shutdown circuit 4 is only finished function by the thermistor PTC7 of a positive temperature coefficient.PTC is connected between translation circuit module 3 and the led array, and when temperature raise, the electric current that the resistance by PTC increases LED carried out current limliting.
A kind of automotive lighting with the driving method of step-down constant current LED is: automobile supplies power to buffer circuit module 1 with DC power supply 12V by anti-reverse diode D2, export the metal-oxide-semiconductor drive circuit to through buffer circuit module 1 filtered signal, give the grid of enough open and close of metal-oxide-semiconductor Q3, source voltage is poor, pwm chip 6 output square-wave pulse signals are to the switching of metal-oxide-semiconductor Q3 control metal-oxide-semiconductor Q3 simultaneously, the switching duty ratio of metal-oxide-semiconductor Q3 is removed the energy of control change circuit, translation circuit converts the 12VDC step-down of importing to be lower than 12V voltage and exports to the led array group, it (is the R7 in the accompanying drawing 2 that led array group upper end is in series with sampling resistor Rsns, R8, R9), voltage difference by sampling Rsns two ends, be about to flow through the product magnitude of voltage of the current value of led array (sampling resistor Rsns promptly flows through) and sampling resistor Rsns by the fixed reference potential value comparison of operational amplifier U2A with pwm chip 6 inside, feed back to pwm chip 6, logic by 6 inside is with the output duty cycle of the output Vout pin of control pwm chip 6, indirect regulation the switching duty of metal-oxide-semiconductor Q3 recently reach the output energy of control change circuit, thereby reach the purpose of output constant current to the led array group.In addition; utilize the function of the internal short-circuit protection pin SCP of PWM chip 6; designed LED load protection circuit 4; under the situation of LED short circuit, the anodal misconnection power supply of LED 8 both positive and negative polarities, LED negative pole misconnection power supply 8 positive poles; thereby can turn-off pwm chip 6 input current is reduced to a very little value; and utilize transistorized switch combination effect that the flow through loop of LED of electric current is blocked, thereby entire circuit is protected.
The circuit of this driving method has the metal-oxide-semiconductor driving force.At first automobile supplies power to buffer circuit module 1 with DC power supply 12V by anti-reverse diode D2, output signal to metal-oxide-semiconductor drive circuit module 2 after the LC filtering through buffer circuit module 1, the method of this metal-oxide-semiconductor drive circuit is (seeing accompanying drawing 2): when the square-wave pulse of pwm chip 6 outputs is low level, then this low level is through R4, grid G to metal-oxide-semiconductor Q3 after the R3 dividing potential drop still is very low level, and the source S of metal-oxide-semiconductor Q3 connects the high level of buffer circuit module 1 output, because the voltage difference of the G utmost point and the S utmost point is enough big, surpassed 5V, so metal-oxide-semiconductor Q3 has reached the state of complete conducting at this moment.And this moment because metal-oxide-semiconductor Q3 conducting, electric current flow to triode Q1 base stage via diode D3, then triode Q1 is because pressure reduction inadequately can not conducting, promptly triode Q1 is in cut-off state at this moment.When the square-wave pulse of pwm chip 6 outputs was high level, the Q3 source current flow to charging capacitor C6 positive pole through R2, R3, and this moment, charging capacitor C6 cathode voltage was made as V1; Again because the work of the unidirectional afterflow of diode D3, the former Vcc that is made as of the cathode voltage of charging capacitor C6, then the voltage owing to charging capacitor C6 two ends can not suddenly change, make the voltage bootstrapping of its negative pole rise to (V1+Vcc), then the rapid conducting of triode Q1 makes the grid G level of metal-oxide-semiconductor Q3 equate with the source S level, then metal-oxide-semiconductor Q3 reaches rapidly by turn-offing, though do not have driving force pwm chip 6 fast driving metal-oxide-semiconductor Q3 conducting with end.
In addition, at the voltage-dropping type circuit, (drawn high to greater than 1V the time when the SCP pin, chip quits work automatically, will export shutoff, i.e. Vout=0 to utilize the SCP short-circuit protection pin function of PWM chip.); design a kind of reliable and effective protective circuit 4: when the load led array by short circuit; when perhaps the positive and negative terminal of load led array is by the positive and negative terminal short circuit of power supply 8; can turn-off the PWM chip in real time; utilize metal-oxide-semiconductor Q2 to cut off the flow through loop of LED of electric current, protection whole LED drive circuit and load LED simultaneously.When the short circuit of load led array positive and negative electrode, the electric current that flows through sampling resistor R7, R8, R9 is very big, the voltage of metal-oxide-semiconductor Q2 drain electrode end is very big, exporting the SCP pin to draws high its level, because the SCP pin is drawn high, pwm chip 6 turn-offs chip according to self internal logic, and making output pin Vout is zero; On the other hand, the drain electrode of metal-oxide-semiconductor Q4 is because the short circuit of LED and drawn high and is high level, and triode Q4 base stage is a high level and conducting is pulled to ground, metal-oxide-semiconductor Q2 grounded-grid, the V of Q2 at this moment
GSPressure reduction can not reach the conducting requirement of metal-oxide-semiconductor, and Q2 is by the turn-off current loop of LED of flowing through, thereby has protected whole LED drive circuit and load LED.When load led array positive pole connect power supply 8 negative poles, the situation of similar above-mentioned LED load short circuits was equally protected circuit and load with above-mentioned method.When load led array positive pole connects battery supply 8 positive poles; after the dividing potential drop of the high voltage of positive source through resistance R 12, R26; make triode Q5 conducting ground connection behind the base stage current-limiting resistance R25 through triode Q5; thereby the grid level that causes metal-oxide-semiconductor Q2 is low; gate-source voltage difference Vgs＜2V of Q2 is not enough to conducting Q2, and Q2 ends; the turn-off current loop of LED of flowing through, thus whole LED drive circuit and load LED protected.When load led array negative pole connect power supply 8 positive poles, high level directly was pulled to the SCP pin of pwm chip 6, because the SCP pin is drawn high, chip 6 is implemented defencive functions will export shutoff; Leakage, the source electrode of metal-oxide-semiconductor Q2 are drawn high to power supply 8 voltage 12V simultaneously, and then the base stage of triode Q4 is a high level, and Q3 conducting ground connection is low thereby make the grid level of metal-oxide-semiconductor Q2, at this moment grid, the source electrode pressure reduction V of metal-oxide-semiconductor Q2
GSCan not reach the conducting requirement of metal-oxide-semiconductor, metal-oxide-semiconductor Q2 is by the turn-off current loop of LED of flowing through, thereby protected whole LED drive circuit and load LED.When load led array negative pole connects power cathode, because under the circuit normal operation, metal-oxide-semiconductor Q2 is in conducting state always, so the negative pole of led array (being the drain electrode end of metal-oxide-semiconductor Q2) also is pulled low to ground level always,, the led array negative pole can any influence and damage not arranged to drive circuit and LED load so connecing power cathode yet.
The pulse-width modulation PWM chip of circuit utilization of the present invention is the relatively cheap Voltage Feedback monocycle chip of price, under the situation that lacks the current feedback ring, innovation ground is connected on sampling resistor Rsns in the led array string, utilization flow through led array electric current also equal flow through sampling resistor, by measuring sampling resistor R7, R8, the voltage at R9 two ends, and this voltage difference amplified the feedback end FB that feeds back to pwm chip 6, self-reference voltage with this voltage difference and chip internal compares, thereby the output duty cycle of controlling PWM chip 6 reaches the purpose of constant output electric current (electric current on the LED that promptly flows through).
And, be connected in the current supply circuit of led array by thermistor PTC7 positive temperature coefficient, increases the characteristic of resistance because PTC has to raise with temperature, when ambient temperature is too high when causing the increase of PTC resistance, the electric current in the current supply circuit of led array is also corresponding to be reduced.Temperature is high more, and the PTC resistance is big more, and electric current is also corresponding in the major loop reduces, thereby has realized the overheat protector function.
Claims (6)
1. step-down constant current LED drive circuit for automobile lighting; this circuit comprises buffer circuit module (1); this buffer circuit module (1) input is electrically connected with power supply (8); output is electrically connected with metal-oxide-semiconductor drive circuit module (2) and translation circuit module (3); pwm chip (6) Vin terminal is electrically connected with power supply (8); the Vout terminal is electrically connected with metal-oxide-semiconductor drive circuit module (2) and translation circuit module (3); the output termination LED lamp group (9) of translation circuit module (3); current sampling resistor (7) is serially connected on the LED lamp group; one end of feedback circuit module (5) connects the output and the LED lamp group (9) of translation circuit module (3), and the other end connects pwm chip (6) FB terminal; between LED lamp group (9) earth terminal and pwm chip (6) SCP terminal, also be provided with protective circuit module (4).
2. drive circuit according to claim 1 is characterized in that: described metal-oxide-semiconductor drive circuit module (2) can be exported a voltage of enough opening or close metal-oxide-semiconductor grid, voltage between source electrodes difference.
3. drive circuit according to claim 2, it is characterized in that: described metal-oxide-semiconductor drive circuit module (2) is by metal-oxide-semiconductor Q3, resistance R 2, NPN triode Q1, diode D3, capacitor C 6, divider resistance R3, R4 forms, wherein the output end vo ut of PWM chip 6 is through divider resistance R4 and R3, C6 connects, diode D3 is connected across between C6 and the R3, the negative pole of D3 is connected to the base stage of triode Q1, the positive pole of D2 is connected to the emitter of triode Q1, resistance R 2 is connected in parallel between the collector and emitter of triode Q3, the emitter of Q1 is connected to the grid of metal-oxide-semiconductor Q3 simultaneously, the collector electrode of Q1 is connected to the source electrode of metal-oxide-semiconductor Q3, and the drain electrode of metal-oxide-semiconductor Q3 connects translation circuit module (3).
4. drive circuit according to claim 1 is characterized in that: described protective circuit module (4) is by resistance R 10, R11, R12, R13, R14, R25, R26, and NPN triode Q4, Q5 and metal-oxide-semiconductor Q2 form; Metal-oxide-semiconductor Q2 is connected in the led array string, the drain electrode of metal-oxide-semiconductor Q2 connects the negative pole of LED lamp group, metal-oxide-semiconductor Q2 is a source ground, the output of the grid of Q2 connect respectively resistance R 11 to ground be connected the output of resistance R 10 to translation circuit, the grid of Q2 is connected to the collector electrode of NPN triode Q4 simultaneously, the grounded emitter of Q4, base stage connects resistance R 13, connects the SCP pin of current-limiting resistance R14 to PWM chip again; The negative pole of led array is connected directly in the middle of R13, the R14 simultaneously, and the positive pole of led array is drawn and connected divider resistance R12, R26, through the base stage of current-limiting resistance R25 connection triode Q5, and the grounded emitter of Q5, collector electrode is connected to the grid of metal-oxide-semiconductor Q2.
5. drive circuit according to claim 1, it is characterized in that: described feedback circuit module (5) is the Voltage Feedback mononuclear type, sampling resistor Rsns is connected in the led array string, utilization flow through led array electric current also equal flow through sampling resistor, by measuring the voltage at sampling resistor R7, R8, R9 two ends, and this voltage difference is amplified the feedback end FB that feeds back to pwm chip (6).
6. drive circuit according to claim 1 is characterized in that: the thermistor PTC (7) that is in series with a positive temperature coefficient in the current supply circuit of led array.
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| CN 201010138214 CN101815382B (en) | 2010-04-02 | 2010-04-02 | Step-down constant current LED drive circuit for automobile lighting |
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| CN 201010138214 CN101815382B (en) | 2010-04-02 | 2010-04-02 | Step-down constant current LED drive circuit for automobile lighting |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201307952Y (en) * | 2008-10-21 | 2009-09-09 | 上海欧切斯实业有限公司 | LED constant-voltage driving controller |
| CN201418178Y (en) * | 2009-05-07 | 2010-03-03 | 漳州市锦达电子有限公司 | A LED constant-current drive apparatus |
-
2010
- 2010-04-02 CN CN 201010138214 patent/CN101815382B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201307952Y (en) * | 2008-10-21 | 2009-09-09 | 上海欧切斯实业有限公司 | LED constant-voltage driving controller |
| CN201418178Y (en) * | 2009-05-07 | 2010-03-03 | 漳州市锦达电子有限公司 | A LED constant-current drive apparatus |
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