CN216820159U - Linear constant-current LED drive circuit with temperature compensation function and car lamp control system thereof - Google Patents
Linear constant-current LED drive circuit with temperature compensation function and car lamp control system thereof Download PDFInfo
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- CN216820159U CN216820159U CN202123150236.8U CN202123150236U CN216820159U CN 216820159 U CN216820159 U CN 216820159U CN 202123150236 U CN202123150236 U CN 202123150236U CN 216820159 U CN216820159 U CN 216820159U
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Abstract
The utility model relates to the field of LED drive circuits, in particular to a linear constant-current LED drive circuit with temperature compensation and a car lamp control system thereof, comprising: the LED light-emitting device comprises a power signal processing module, an LED light-emitting module, a reference source module and a temperature-compensated linear constant current module; the input end of the power supply signal processing module is electrically connected with a power supply end; the input end of the LED light-emitting module and the input end of the reference source module are electrically connected with the output end of the power signal processing module; the output end of the LED light-emitting module and the output end of the reference source module are in signal connection with the linear constant current module for temperature compensation; the input end of the temperature-compensated linear constant current module is electrically connected with the output end of the temperature-compensated linear constant current module; the temperature-compensated linear constant current module comprises a current mirror circuit, a third resistor R3, a fourth resistor R4 and a fifth resistor R5. The LED driving circuit can improve the current distortion degree in the circuit, ensure the continuity of stable work of the circuit and ensure the normal work of an LED lamp.
Description
Technical Field
The utility model relates to the field of LED driving circuits, in particular to a linear constant-current LED driving circuit with temperature compensation and a car lamp control system thereof.
Background
Generally, an LED (light emitting diode) Lamp (Lamp) can be lit at a low voltage, and has features of a long life, low power consumption, a fast response speed, and impact resistance as compared with an incandescent Lamp (Bulb), and the like, and can be made small and light. Therefore, the LED lamp can be well adapted to automotive lighting.
In order to drive the LED lamp, a linear constant current circuit is adopted. Research shows that when a transistor circuit is formed by using a semiconductor component and a triode, a lot of heat loss is generated during working. Therefore, when the temperature of the semiconductor device increases due to heat loss, the operating current input to the LED also increases, and the LED lamp exhibits a difference in brightness, and it is very important how to stably operate the linear constant current circuit by the circuit process of the LED lamp.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: the linear constant-current LED driving circuit with the temperature compensation can improve the distortion degree of current in the circuit, ensure the continuity of stable work of the circuit and ensure the normal work of an LED lamp.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a linear constant current LED drive circuit with temperature compensation, comprising: the LED light-emitting device comprises a power signal processing module, an LED light-emitting module, a reference source module and a temperature-compensated linear constant current module; the input end of the power supply signal processing module is electrically connected with a power supply end; the input end of the LED light-emitting module and the input end of the reference source module are both electrically connected with the output end of the power supply signal processing module; the output end of the LED light-emitting module and the output end of the reference source module are in signal connection with the linear constant current module with temperature compensation; the input end of the temperature-compensated linear constant current module is electrically connected with the output end of the temperature-compensated linear constant current module; the temperature-compensated linear constant current module comprises a current mirror circuit, a third resistor R3, a fourth resistor R4 and a fifth resistor R5; the input end of the current mirror circuit is electrically connected with the input end of the temperature-compensated linear constant current module, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are connected in parallel, one end of the parallel connection is electrically connected with the output end of the current mirror circuit, and the other end of the parallel connection is electrically connected with the output end of the temperature-compensated linear constant current module.
Further, specifically, the current mirror circuit includes a sixth resistor R6, a first transistor Q1 and a second transistor Q2, one end of the sixth resistor R6 is electrically connected to the input end of the current mirror circuit, the other end of the sixth resistor R6 is connected to the collector of the first transistor Q1, the collector of the first transistor Q1 is connected to the base of the second transistor Q2, the base of the first transistor Q1 is connected to the base of the second transistor Q2, the emitter of the first transistor Q1 and the emitter of the second transistor Q2 are connected to the common ground, and one end of the collector of the second transistor Q2 is electrically connected to the output end of the current mirror circuit.
Further, specifically, the sixth resistor R6, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are all adjustable resistors.
Further, specifically, the first transistor Q1 and the second transistor Q2 are both NPN transistors.
Further, specifically, the power end is electrically connected with the power supply of the LED lighting module or the storage battery.
Further, specifically, the power signal processing module includes a first diode T1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first resistor R, and a first anti-reverse diode D1, one end of the first diode T1, one end of the first capacitor C1, one end of the third capacitor C3, one end of the first resistor R1, and an anode of the first anti-reverse diode D1 are all electrically connected to the input end of the power signal processing module, the other end of the first diode T1 is connected to a common ground, the other end of the first capacitor C1 is connected in series to one end of the second capacitor C2, and is connected to the common ground after being connected in series, the other end of the third capacitor C3 is connected in series to one end of the fourth capacitor C4, and is connected to the common ground after being connected in series, the other end of the first resistor R1 is connected to the common ground, and the cathode of the first anti-reverse diode D1 is electrically connected with the output end of the power supply signal processing module.
Further, in particular, the LED light emitting module includes: the LED illuminating device comprises a second resistor R2, a fifth capacitor C5, a sixth capacitor C6, a first LED 1, a second LED L2, a first voltage stabilizing diode D2 and a second voltage stabilizing diode D3, wherein one end of the second resistor R2 is electrically connected with the input end of the LED illuminating module, the fifth capacitor C5, the first LED L1 and the first voltage stabilizing diode D2 are connected in parallel to form a first group of LED illuminating circuits, one end of the first resistor R3875 after the parallel connection is connected with the other end of the second resistor R2, the sixth capacitor C6, the second LED L2 and the voltage stabilizing diode D3 are connected in parallel to form a second group of LED illuminating circuits, one end of the second resistor C2 after the parallel connection is electrically connected with the output end of the LED illuminating module (2), and the first group of LED illuminating circuits and the second group of LED illuminating circuits are connected in series.
Further, in particular, the reference source module comprises: seventh resistance R7, fourth electric capacity C4 and two switch diode D4, seventh resistance R7's one end with the input electricity of benchmark source module is connected, seventh resistance R7's the other end with two switch diode D4's anodal series connection, two switch diode D4's positive pole with the output electricity of benchmark source module is connected, electric capacity C7 with two switch diode D4 parallel connection, two switch diode D4's negative pole and public ground end connection.
A control system of a vehicle lamp comprises the linear constant-current LED driving circuit with temperature compensation.
The beneficial effect of the utility model is that,
(1) the linear constant-current LED driving circuit with the temperature compensation can improve the distortion degree of current in the circuit, and not only can the requirements that the light-emitting diode outputs current within a safe working temperature range, the output power works in a rated state, and the output current is constant;
(2) when the temperature is higher than the maximum allowable temperature value of the light-emitting diode, the LED is subjected to constant current control through the current mirror circuit through the linear constant current module for temperature compensation so as to reduce the output current to an allowable range, so that the service life of the light-emitting diode is ensured, the temperature compensation is carried out, the safety of the circuit is improved, and the continuity of the stable work of the circuit is ensured;
(3) the current of the LED is adjusted through the third resistor R3, the fourth resistor R4 and the fifth resistor R5, the requirement on the brightness of the LED lamp is met, and the normal work of the LED lamp is guaranteed.
Drawings
The utility model is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic circuit diagram of the preferred embodiment of the present invention.
Fig. 2 is a circuit diagram of a power signal processing module according to a preferred embodiment of the present invention.
Fig. 3 is a circuit diagram of an LED lighting module according to a preferred embodiment of the present invention.
Fig. 4 is a circuit diagram of a reference source module in accordance with a preferred embodiment of the present invention.
Fig. 5 is a circuit diagram of a temperature compensated linear constant current module in accordance with a preferred embodiment of the present invention.
In the figure, the LED constant current temperature compensation device comprises a power supply signal processing module 1, an LED light-emitting module 2, a reference source module 3 and a temperature compensation linear constant current module 4.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 1, which is a preferred embodiment of the present invention, a linear constant current LED driving circuit with temperature compensation comprises: the device comprises a power signal processing module 1, an LED light-emitting module 2, a reference source module 3 and a linear constant current module 4 for temperature compensation; the input end of the power signal processing module 1 is electrically connected with a power supply end; the input end of the LED light-emitting module 2 and the input end of the reference source module 3 are both electrically connected with the output end of the power signal processing module 1; the output end of the LED light-emitting module 2 and the output end of the reference source module 3 are in signal connection with a linear constant current module 4 with temperature compensation; the input end of the temperature-compensated linear constant current module 4 is electrically connected with the output end of the temperature-compensated linear constant current module 4. The power supply end is electrically connected with a power supply or a storage battery of the LED light-emitting module (2), and the power supply end is used for acquiring a power supply signal from the power supply or the storage battery of the LED light-emitting module.
In an embodiment, as shown in fig. 5, the temperature compensated linear constant current module 4 includes a current mirror circuit, a third resistor R3, a fourth resistor R4, and a fifth resistor R5; the input end of the current mirror circuit is electrically connected with the input end of the temperature-compensated linear constant current module 4, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are connected in parallel, one end of the parallel connection is electrically connected with the output end of the current mirror circuit, and the other end of the parallel connection is electrically connected with the output end of the temperature-compensated linear constant current module 4.
The current mirror circuit comprises a sixth resistor R6, a first triode Q1 and a second triode Q2, one end of the sixth resistor R6 is electrically connected with the input end of the current mirror circuit, the other end of the sixth resistor R6 is connected with the collector of the first triode Q1, the collector of the first triode Q1 is connected with the base of the second triode Q2, the base of the first triode Q1 is connected with the base of the second triode Q2, the emitter of the first triode Q1 is connected with the emitter of the second triode Q2 and connected with the common ground, and one end of the collector of the second triode Q2 is electrically connected with the output end of the current mirror circuit.
The sixth resistor R6, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are all adjustable resistors, and the first triode Q1 and the second triode Q2 are both NPN type triodes. Specifically, the sixth resistor R6 is a collector bias resistor of the first transistor Q1, and the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are collector bias resistors of the second transistor Q2. Compared with the prior art, the linear constant current module in the prior art has unstable working state along with the temperature change, sometimes has large or small working current provided for the LED, and when the difference of brightness and darkness of the displayed luminous effect is large, the temperature-compensated linear constant current module provided by the utility model can improve the distortion degree of the current in the circuit, the constant current control of the LED light-emitting module is realized through a first triode Q1 and a second triode Q2, the current of the LED light-emitting module is adjusted through a third resistor R3, a fourth resistor R4 and a fifth resistor R5, specifically, the sum of the currents of the third resistor R3, the fourth resistor R4 and the fifth resistor R5 is equal to the collector current flowing through the second triode Q2, the current output to the LED light-emitting module is equal to the current passing through the third resistor R3, the fourth resistor R4 and the fifth resistor R5, therefore, the requirements of the LED on the brightness during use are met, and the continuity of the stable work of the circuit is ensured.
In an embodiment, as shown in fig. 2, the power signal processing module 1 includes a first diode T1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first resistor R1, and a first anti-reverse diode D1, wherein one end of the first diode T1, one end of the first capacitor C1, one end of the third capacitor C3, one end of the first resistor R1, and an anode of the first anti-reverse diode D1 are all electrically connected to an input end of the power signal processing module 1, the other end of the first diode T1 is connected to a common ground, the other end of the first capacitor C1 is connected in series with one end of the second capacitor C2 and then connected to the common ground, the other end of the third capacitor C3 is connected in series with one end of the fourth capacitor C4 and then connected to the common ground, the other end of the first resistor R1 is connected to the common ground, the cathode of the first anti-reverse diode D1 is electrically connected with the output end of the power supply signal processing module 1.
Specifically, a power supply end of a power supply is connected with an input end of a power signal processing module, a power signal passes through a first diode T1, the first diode T1 is a transient voltage suppression diode TVS, the first diode T1 is a clamping protector, when voltage or current in a bus is unstable, surge voltage fluctuation exists, after a protection device of the first diode T1 is broken down, voltage at two ends of the first diode T1 can be stabilized at breakdown voltage (VF value) and cannot be increased, and a circuit is protected in a clamping mode; then, a power supply signal is filtered through a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4, and as the first capacitor C1 is connected with the second capacitor C2 in series and the third capacitor C3 is connected with the fourth capacitor C4 in series, when one of the capacitors is short-circuited, the rest capacitors can continue to work, and the power supply is prevented from being short-circuited to the ground; the first resistor R1 is used for absorbing a small current signal at the input end of the power supply signal processing module; the diode D1 is used for protection against reverse connection, and when the positive pole and the negative pole of the power input are connected reversely, the diode D1 is used for protecting the circuit.
In an embodiment, as shown in fig. 3, the LED lighting module 2 includes: the LED illuminating device comprises a second resistor R2, a fifth capacitor C5, a sixth capacitor C6, a first LED 1, a second LED L2, a first voltage stabilizing diode D2 and a second voltage stabilizing diode D3, wherein one end of the second resistor R2 is electrically connected with the input end of the LED illuminating module 2, the fifth capacitor C5, the first LED L1 and the first voltage stabilizing diode D2 are connected in parallel to form a first group of LED illuminating circuits, one end of the parallel connection is connected with the other end of the second resistor R2, the sixth capacitor C6, the second LED L2 and the voltage stabilizing diode D3 are connected in parallel to form a second group of LED illuminating circuits, one end of the parallel connection is electrically connected with the output end of the LED illuminating module (2), and the first group of LED illuminating circuits and the second group of LED illuminating circuits are connected in series.
Specifically, the second resistor R2 is a current limiting resistor of the first zener diode D2 and the second zener diode D3. The first zener diode D2 is connected in parallel with the first LED L1, the zener diode D3 is connected in parallel with the second LED L2, the conduction voltages of the first zener diode D2 and the zener diode D3 are VT, the conduction voltages of the first LED L1 and the second LED L2 are VD, during normal operation, the conduction voltages of the first zener diode D2 and the zener diode D3 are VT > VD, when one of the LEDs is open-circuited (the reverse voltage of the zener diode is greater than the threshold value of the reverse voltage), the zener diode connected in parallel with the one of the LEDs breaks down and conducts, and the remaining LEDs can continue to operate, thereby performing an open-circuit protection function on the LED lighting module 2.
In an embodiment, as shown in fig. 4, the reference source module 3 includes: the reference source module comprises a seventh resistor R7, a fourth capacitor C4 and a double-switch diode D4, wherein one end of the seventh resistor R7 is electrically connected with the input end of the reference source module 3, the other end of the seventh resistor R7 is connected with the anode of the double-switch diode D4 in series, the anode of the double-switch diode D4 is electrically connected with the output end of the reference source module 3, the capacitor C7 is connected with the double-switch diode D4 in parallel, and the cathode of the double-switch diode D4 is connected with the common ground end.
Specifically, the reference source module 3 is configured to provide a reference voltage to the temperature-compensated linear constant current module 4, where the reference voltage is a lower limit voltage of operation and is a fixed voltage value, and the fixed voltage value is in a range from 1V to 1.4 and does not change with fluctuation of current in the circuit, and in this embodiment, if the voltage of D4 to ground is 1.4V, the reference voltage is provided to the temperature-compensated linear constant current module 4 and is 1.4V.
The working principle is as follows:
when the power supply is electrified, the power supply signal is transmitted to the LED light-emitting module and the reference source module after being subjected to signal processing of the power supply signal processing module, pulse interference suppression and reverse connection prevention protection,
the current of the second resistor R2 is I1The power supply input voltage is VINThe forward voltage of the first diode D1 is V1The forward conduction voltage of the fourth diode D4 is V2Current I flowing through the second resistor R21Comprises the following steps:
the current of the fourth diode D4 is I2The internal resistance of the fourth diode D4 is R, and the current flowing through the fourth diode D4 is:
the current of the sixth resistor R6 is I3The collector current of the first transistor Q1 is IcThe PN junction voltage of the emitter of the first triode Q1 is VBEThe sixth resistor R6 is connected to the collector of the first transistor Q1, and the collector current of the first transistor Q1 is:
The collector current of the second triode Q2 is I4，The collector current I4 is a current of the led, and the current of the led corresponds to different luminous fluxes according to different luminances BIN, and the required current requirements are different.
In one embodiment, the resistance of the sixth resistor R6 is different, and the collector current I of the first transistor Q1cThe resistance value of the temperature compensation linear constant current module can also change along with the resistance value of the R6, and the circuit adopts a linear driving scheme, particularly, the input end and the output end branch of the temperature compensation linear constant current module are both connected with the output end of the LED light-emitting module, the input end and the output end of the temperature compensation linear constant current module are connected, and the first triode Q1 and the second triode Q2 realize constant current control on the LED, namely, the collector current I of the second triode Q24Is the current value of the first light emitting diode L1.
In the embodiment, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are used for adjusting the current of the LED to meet the requirement of the light emitting brightness of the LED. When the LED is used, half of the energy consumed by driving the LED is converted into heat energy, and the luminous flux of the LED is influenced by excessive heat consumptionOutput and generate color cast, and the like, and reduce the service life of the LED. The working current output corresponding to different working temperatures of the LED is different, when the working temperature is lower than the maximum allowable temperature value of the LED, the maximum current output value is unchanged, when the working temperature is higher than the maximum allowable temperature value of the LED, the output maximum current value can be reduced along with the rise of the temperature, in order to ensure that the performance and the service life of the LED are more reliable, the LED works within the normal allowable temperature range, and when the temperature of the LED rises, the collector current I of the second triode Q24The collector current flowing through the first transistor Q1, i.e. the resistor R6 current I, will increase3The voltage drop across the resistor R6 becomes larger, and the emitter PN junction voltage V of the first transistor Q1 becomes largerBEReduced value, base current IBThe collector current I of the first triode Q1 is reducedcAnd then the collector current I of the second triode Q2 becomes smaller4The temperature compensation linear constant current module can reduce the current, when the working state of the temperature compensation linear constant current module is unstable under a certain temperature condition, the working current provided for the LED can not increase along with the temperature rise, the temperature compensation linear constant current module improves the distortion degree of the current in the circuit, and the collector current I of the second triode Q24Output to LED light emitting module, improved LED's stability for LED can last work, and improved LED's life, in addition through third resistance R3, fourth resistance R4 and fifth resistance R5 adjust LED's electric current, satisfy the luminous luminance requirement to the LED lamp, further improved LED's stability, make LED lamp's normal work.
A vehicle lamp control system comprises the linear constant-current LED driving circuit with the temperature compensation function.
According to the linear constant-current LED driving circuit with the temperature compensation and the car lamp control system thereof, the light-emitting diode works in a safe area, the current output within a safe working temperature range is met, the output power works in a rated state, the current is constant, when the temperature of the light-emitting diode is higher than the maximum allowable temperature value of the light-emitting diode, the output current is reduced to the allowable range, the brightness of the LED lamp bead is reduced, the heat productivity of the LED lamp bead is reduced, the LED is balanced on a certain temperature point and the output current, the service life of the light-emitting diode is ensured, the temperature compensation is carried out, and the safety and the stability of the circuit are improved.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations can be made by the worker in the light of the above teachings without departing from the spirit of the utility model. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (9)
1. A linear constant current LED drive circuit with temperature compensation is characterized in that: the method comprises the following steps:
the LED light source comprises a power signal processing module (1), an LED light-emitting module (2), a reference source module (3) and a linear constant current module (4) for temperature compensation;
the input end of the power supply signal processing module (1) is electrically connected with a power supply end;
the input end of the LED light-emitting module (2) and the input end of the reference source module (3) are both electrically connected with the output end of the power signal processing module (1);
the output end of the LED light-emitting module (2) and the output end of the reference source module (3) are in signal connection with the linear constant current module (4) with temperature compensation;
the input end of the temperature-compensated linear constant current module (4) is electrically connected with the output end of the temperature-compensated linear constant current module (4);
the temperature-compensated linear constant current module (4) comprises a current mirror circuit, a third resistor R3, a fourth resistor R4 and a fifth resistor R5;
the input end of the current mirror circuit is electrically connected with the input end of the temperature-compensated linear constant current module (4), the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are connected in parallel, one end of the parallel connection is electrically connected with the output end of the current mirror circuit, and the other end of the parallel connection is electrically connected with the output end of the temperature-compensated linear constant current module (4).
2. The linear constant-current LED driving circuit with temperature compensation according to claim 1, wherein: the current mirror circuit comprises a sixth resistor R6, a first triode Q1 and a second triode Q2, wherein one end of the sixth resistor R6 is electrically connected with the input end of the current mirror circuit, the other end of the sixth resistor R6 is connected with the collector of the first triode Q1, the collector of the first triode Q1 is connected with the base of the second triode Q2, the base of the first triode Q1 is connected with the base of the second triode Q2, the emitter of the first triode Q1 and the emitter of the second triode Q2 are connected with a common ground, and one end of the collector of the second triode Q2 is electrically connected with the output end of the current mirror circuit.
3. The linear constant-current LED driving circuit with temperature compensation according to claim 2, wherein: the sixth resistor R6, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are all adjustable resistors.
4. The linear constant-current LED driving circuit with temperature compensation according to claim 2, wherein: the first transistor Q1 and the second transistor Q2 are both NPN transistors.
5. The linear constant-current LED driving circuit with temperature compensation according to claim 1, wherein: the power end is electrically connected with a power supply or a storage battery of the LED light-emitting module (2).
6. The linear constant-current LED driving circuit with temperature compensation according to claim 1, wherein: the power supply signal processing module (1) comprises a first diode T1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first resistor R1 and a first anti-reverse diode D1, one end of the first diode T1, one end of the first capacitor C1, one end of the third capacitor C3, one end of the first resistor R1 and the anode of the first anti-reverse diode D1 are all electrically connected with the input end of the power supply signal processing module (1), the other end of the first diode T1 is connected with a common ground end, the other end of the first capacitor C1 is connected with one end of the second capacitor C2 in series and then connected with the common ground end, the other end of the third capacitor C3 is connected with one end of the fourth capacitor C4 in series and then connected with the common ground end, and the other end of the first resistor R1 is connected with the common ground end, and the cathode of the first anti-reverse diode D1 is electrically connected with the output end of the power supply signal processing module.
7. The linear constant-current LED driving circuit with temperature compensation according to claim 1, wherein: the LED lighting module (2) comprises: the LED light-emitting module comprises a second resistor R2, a fifth capacitor C5, a sixth capacitor C6, a first light-emitting diode L1, a second light-emitting diode L2, a first voltage regulator diode D2 and a second voltage regulator diode D3, wherein one end of the second resistor R2 is electrically connected with the input end of the LED light-emitting module (2), the fifth capacitor C5, the first light-emitting diode L1 and the first voltage regulator diode D2 are connected in parallel to form a first group of LED light-emitting circuits, one end of the parallel connection is connected with the other end of the second resistor R2, the sixth capacitor C6, the second light-emitting diode L2 and the voltage regulator diode D3 are connected in parallel to form a second group of LED light-emitting circuits, one end of the parallel connection is electrically connected with the output end of the LED light-emitting module (2), and the first group of LED light-emitting circuits and the second group of LED light-emitting circuits are connected in series.
8. The linear constant-current LED driving circuit with temperature compensation according to claim 1, wherein: the reference source module (3) comprises: seventh resistance R7, fourth electric capacity C4 and two switch diode D4, seventh resistance R7's one end with the input electricity of benchmark source module (3) is connected, seventh resistance R7's the other end with two switch diode D4's positive series connection, two switch diode D4's positive pole with the output electricity of benchmark source module (3) is connected, electric capacity C7 with two switch diode D4 parallel connection, two switch diode D4's negative pole and public ground end connection.
9. A vehicle lamp control system characterized in that: the vehicle lamp control system comprises the linear constant-current LED driving circuit with temperature compensation according to any one of claims 1 to 8.
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