Driving control circuit for vehicle LED light assembly

Abstract

The utility model discloses a drive control circuit for a vehicle LED light assembly, and relates to the field of vehicle LED light control. Wherein the power supply processing module is used for connecting a positive electrode power supply, processing the positive electrode power supply and inputting the processed positive electrode power supply into the temperature control module; the temperature control module is used for monitoring the environment temperature of the vehicle LED light assembly and adjusting the input voltage of the control pin of the control chip based on the change of the environment temperature. The control module is used for dynamically adjusting the power supply current supplied to the vehicle LED light assembly according to the magnitude of the input voltage of the control pin; according to the utility model, the environment temperature of the vehicle LED light assembly is monitored in real time, and the input voltage of the control pin of the control chip is automatically adjusted based on the change of the environment temperature, so that the power supply current of the vehicle LED light assembly is adjusted, and the problem of overheating or insufficient performance possibly caused by traditional fixed parameter setting is avoided; especially in a high-temperature environment, element damage and service life shortening caused by too high temperature are effectively prevented.

Description

Technical Field

[0001] This utility model relates to the field of vehicle LED lighting control, and in particular to a drive control circuit for vehicle LED lighting components. Background Technology

[0002] Puddle lights are lights installed on automobiles, typically located at the bottom of the doors or below the rearview mirrors. They automatically illuminate when the door is opened or during specific operations. The primary function of these lights is to illuminate the ground at night or in low-light conditions, helping drivers and passengers better observe their surroundings, alerting them to ground conditions, and warning oncoming vehicles and pedestrians. By enhancing visibility, puddle lights significantly improve driving safety, providing a crucial aid to safe driving.

[0003] With advancements in technology and continuous upgrades in vehicle technology, modern automotive lighting fixtures, such as logo lights, turn signals, and ambient lights, are not only becoming smaller in size, but customers are also demanding higher brightness. To meet these needs, designers must ensure efficient heat dissipation within limited space to maintain the performance and lifespan of the lighting fixtures. However, with PCB board size constraints, reducing heat generation requires either improving circuit efficiency or using higher-quality heat dissipation materials. While both methods can solve the problem, they increase production costs, which contradicts the current trend in the automotive industry of cost reduction.

[0004] To address the aforementioned technical problems, this invention proposes an innovative solution: ensuring sufficient brightness for customers at room temperature while automatically reducing LED brightness at high temperatures using NTC thermistors, thereby minimizing heat generation. Specifically, by combining the characteristics of NTC thermistors—namely, their resistance decreasing with temperature—with the control pins of the control chip, intelligent adjustment of the LED output current is achieved. When excessively high temperatures are detected, the circuit automatically adjusts the chip's output current, reducing LED brightness and preventing damage to the PCB board due to overheating. This design not only effectively protects the circuit but also avoids potential losses caused by sustained high temperatures without affecting overall performance, achieving a balance between cost-effectiveness and performance optimization. Utility Model Content

[0005] To automatically adjust the chip's output current and reduce LED brightness when the temperature is too high, thus preventing damage to the PCB board due to overheating, this invention proposes a drive control circuit for vehicle LED lighting components, comprising:

[0006] Power processing module, temperature control module, and control module containing control chip;

[0007] The power processing module is used to connect to the positive power supply, process it, and then input it into the temperature control module.

[0008] The temperature control module is used to monitor the ambient temperature of the vehicle's LED lighting components and adjust the input voltage of the control pin of the control chip based on changes in the ambient temperature.

[0009] The control module is used to dynamically adjust the power supply current supplied to the vehicle's LED lighting components based on the magnitude of the input voltage at the control pin.

[0010] Furthermore, the temperature control module includes: a voltage divider network, a thermistor TR1, and a transistor Q1;

[0011] The thermistor is used to monitor the ambient temperature of the vehicle's LED lighting components. Its resistance change is inversely correlated with the change in ambient temperature; that is, when the ambient temperature rises, the resistance of the thermistor decreases.

[0012] The conduction degree of the transistor Q1 is positively correlated with the change in the resistance of the thermistor. That is, when the resistance of the thermistor decreases, the base voltage of the transistor Q1 decreases and the conduction degree weakens.

[0013] The conduction level of the transistor Q1 is inversely related to the voltage drop of the voltage divider network. That is, when the conduction level of the transistor Q1 decreases, the voltage drop of the voltage divider network increases; when the voltage drop of the voltage divider network increases, the input voltage of the control pin increases; when the input voltage of the control pin increases, the control module controls the power supply current supplied to the vehicle's LED lighting components to decrease.

[0014] Furthermore, the drive control circuit also includes:

[0015] The feedback module is used to detect the actual current passing through the vehicle's LED lighting components and feed it back to the control module;

[0016] The control module is also used to adjust the power supply current to the vehicle's LED lighting components based on the actual current fed back by the feedback module, so that it is stabilized at the set current value.

[0017] Furthermore, the power processing module includes:

[0018] The transient voltage suppression unit is connected to the positive power supply and is used to clamp the transient voltage below a safe voltage when the input of the positive power supply exceeds a set threshold.

[0019] The power input processing unit is connected to the positive power supply to prevent the polarity of the positive power supply VCC from being reversed and to filter out high-frequency noise and pulse interference in the input power supply.

[0020] The LC filter unit is used to smooth the power output from the power input processing unit and input it to the control module.

[0021] Furthermore, the transient voltage suppression unit includes a first TVS diode TVS1; the power input processing unit includes a first capacitor C1 and a reverse connection protection diode DS1.

[0022] The positive power supply is connected in sequence to one end of the first TVS transistor (TVS1) and one end of the first capacitor (C1), and then connected to the positive terminal of the reverse polarity protection diode (DS1); the other end of the first TVS transistor (TVS1) and the other end of the first capacitor (C1) are both grounded; the negative terminal of the reverse polarity protection diode (DS1) is connected to the LC filter unit.

[0023] Furthermore, the LC filter unit includes:

[0024] The second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the seventh capacitor C7, the eighth capacitor C8 and the first inductor L1;

[0025] The negative terminal of the reverse polarity protection diode DS1 is connected in sequence to one end of the seventh capacitor C7, one end of the second capacitor C2, and one end of the fourth capacitor C4, and then connected to one end of the first inductor L1; the other end of the first inductor L1 is connected in sequence to one end of the eighth capacitor C8, one end of the third capacitor C3, and one end of the fifth capacitor C5, and then connected to the power supply pin VIN of the control chip; the other ends of the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the seventh capacitor C7, and the eighth capacitor C8 are all grounded.

[0026] Furthermore, in the temperature control module: the voltage divider network includes a sixth resistor R6 and a seventh resistor R7;

[0027] Wherein: one end of the sixth resistor R6 is connected in sequence to one end of the thermistor TR1 and one end of the ninth capacitor C9, and is also connected to the negative terminal of the first Zener diode Z1 and the parallel connection of the fourth resistor R4 and the fifth resistor R5; the other parallel connection of the fourth resistor R4 and the fifth resistor R5 is connected to one end of the fourth capacitor C4 in the LC filter unit; the positive terminal of the first Zener diode Z1 and the other end of the ninth capacitor C9 are both grounded; the other end of the sixth resistor R6 is connected to the emitter of the transistor Q1; the other end of the thermistor TR1 is simultaneously connected to the base of the transistor Q1 and one end of the seventh resistor R7; the other end of the seventh resistor R7 is grounded; the collector of the transistor Q1 is connected in sequence to the control pin of the control chip, one end of the eighth resistor R8, and one end of the tenth capacitor C10; the other ends of the eighth resistor R8 and the other ends of the tenth capacitor C10 are both grounded.

[0028] Furthermore, the vehicle LED lighting assembly includes a first LED lamp DL1; in the control module:

[0029] The second and third pins of the control chip UC1 are grounded. The fifth pin is connected in sequence to the sixth pin of the control chip UC1, the positive terminal of the first diode D1, and then to one end of the second inductor L2. The other end of the second inductor L2 is connected in sequence to one end of the second filter capacitor T2, the parallel connection of the eleventh capacitor C11 and the sixth capacitor C6, and the negative terminal of the first LED DL1. The other parallel connection of the eleventh capacitor C11 and the sixth capacitor C6 is simultaneously connected to one end of the first filter capacitor T1 and the positive terminal of the first LED DL1, and then connected to the first pin SET of the control chip UC1. The other ends of the second filter capacitor T2 and the first filter capacitor T1 are both grounded. The negative terminal of the first diode D1 is connected to the eighth pin of the control chip UC1, i.e., the power supply pin VIN.

[0030] Furthermore, the control module also includes an RC absorption unit, which includes a second resistor R2 and a third filter capacitor T3; one end of the second resistor R2 is connected to one end of the third filter capacitor T3; the other end of the third filter capacitor T3 is grounded; the fifth and sixth pins of the control chip UC1 are both connected to the other end of the second resistor R2.

[0031] Furthermore, the feedback module includes:

[0032] The first resistor R1 and the third resistor R3 are connected in parallel. One parallel terminal of the first resistor R1 and the third resistor R3 is simultaneously connected to the positive terminal of the first LED DL1 and the first pin SET of the control chip UC1, and the other parallel terminal is simultaneously connected to the negative terminal of the first diode D1 and the power supply pin VIN of the control chip UC1.

[0033] Compared with the prior art, the present invention has at least the following beneficial effects:

[0034] (1) In the drive control circuit of this utility model: the power processing module is used to connect to the positive power supply, process it and input it to the temperature control module; the temperature control module is used to monitor the ambient temperature of the vehicle LED light assembly and adjust the input voltage of the control pin of the control chip based on the change of ambient temperature; the control module is used to dynamically adjust the power supply current supplied to the vehicle LED light assembly according to the magnitude of the input voltage of the control pin; that is, this utility model monitors the ambient temperature of the vehicle LED light assembly in real time and automatically adjusts the input voltage of the control pin of the control chip based on the change of ambient temperature, thereby adjusting the power supply current of the vehicle LED light assembly, avoiding the overheating or insufficient performance problems that may be caused by traditional fixed parameter settings, especially in high temperature environments, effectively preventing component damage and shortened lifespan caused by excessive temperature;

[0035] (2) In the drive control circuit of this utility model, the power processing module is responsible for connecting to the positive power supply and performing necessary filtering, voltage regulation and other processing before inputting it into the temperature control module. This design ensures the power quality entering the system, reduces the impact of external voltage fluctuations on LED lamps, and improves the stability and reliability of the system.

[0036] (3) In this utility model, the control module dynamically adjusts the power supply current supplied to the vehicle LED light assembly according to the magnitude of the input voltage of the control pin. This means that when the temperature rises, the circuit can automatically reduce the LED brightness, reduce heat generation, and protect the circuit from damage. When the temperature returns to normal, it can quickly return to the set brightness level to ensure the consistency of the lighting effect. In addition, this design not only extends the service life of the LED lamps, but also improves the energy efficiency ratio of the entire circuit and reduces energy consumption, which is in line with the trend of energy conservation and environmental protection.

[0037] (4) This utility model achieves over-temperature protection by using an NTC thermistor combined with a control chip (DC-DC switch chip), without the need for additional expensive heat dissipation materials or complex design modifications, thereby effectively controlling production costs; at the same time, by reducing the failure rate caused by overheating, it also indirectly reduces maintenance costs, bringing double cost savings to manufacturers and users. Attached Figure Description

[0038] Figure 1 This is a circuit diagram of a drive control circuit for vehicle LED lighting components. Detailed Implementation

[0039] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0040] Example 1

[0041] To automatically adjust the chip's output current and reduce LED brightness when the temperature is too high, thus preventing damage to the PCB board due to overheating, such as... Figure 1 As shown, this utility model proposes a drive control circuit for vehicle LED lighting components, comprising:

[0042] Power processing module, temperature control module, and control module containing control chip;

[0043] The power processing module is used to connect to the positive power supply, process it, and then input it into the temperature control module.

[0044] The power processing module includes:

[0045] The transient voltage suppression unit is connected to the positive power supply and is used to clamp the transient voltage below a safe voltage when the input of the positive power supply exceeds a set threshold.

[0046] The power input processing unit is connected to the positive power supply to prevent the polarity of the positive power supply VCC from being reversed and to filter out high-frequency noise and pulse interference in the input power supply.

[0047] The transient voltage suppression unit includes: a first TVS transistor, TVS1;

[0048] The power input processing unit includes a first capacitor C1 and a reverse connection protection diode DS1;

[0049] The positive power supply is connected in sequence to one end of the first TVS transistor (TVS1) and one end of the first capacitor (C1), and then connected to the positive terminal of the reverse polarity protection diode (DS1); the other end of the first TVS transistor (TVS1) and the other end of the first capacitor (C1) are both grounded; the negative terminal of the reverse polarity protection diode (DS1) is connected to the LC filter unit.

[0050] Specifically:

[0051] The first TVS transistor, TVS1, is used to prevent transient voltages from exceeding a set threshold from appearing in the input power supply, clamping these transient voltages below a safe voltage level and protecting the subsequent circuitry.

[0052] The first capacitor C1 is used to filter out high-frequency noise and pulse interference in the input power supply and to prevent the polarity of the positive power supply VCC from being reversed.

[0053] The reverse polarity protection diode DS1 is used to ensure that the power supply polarity is connected correctly and to prevent damage to the circuit due to incorrect power supply polarity.

[0054] The LC filter unit is used to smooth the power output from the power input processing unit and input it to the control module.

[0055] The LC filter unit includes:

[0056] The second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the seventh capacitor C7, the eighth capacitor C8 and the first inductor L1;

[0057] The negative terminal of the reverse polarity protection diode DS1 is connected in sequence to one end of the seventh capacitor C7, one end of the second capacitor C2, and one end of the fourth capacitor C4, and then connected to one end of the first inductor L1; the other end of the first inductor L1 is connected in sequence to one end of the eighth capacitor C8, one end of the third capacitor C3, and one end of the fifth capacitor C5, and then connected to the power supply pin VIN of the control chip; the other ends of the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the seventh capacitor C7, and the eighth capacitor C8 are all grounded.

[0058] Specifically: C2, C3, C4, C5, C7, C8 and L1: used to smooth the power supply output of the power input processing unit and provide a stable DC voltage to the control module; these components work together to reduce ripple and noise in the power supply and ensure the stable operation of subsequent circuits.

[0059] The temperature control module is used to monitor the ambient temperature of the vehicle's LED lighting components and adjust the input voltage of the control pin of the control chip based on changes in the ambient temperature.

[0060] The temperature control module includes: a voltage divider network, a thermistor TR1, and a transistor Q1;

[0061] The thermistor is used to monitor the ambient temperature of the vehicle's LED lighting components. Its resistance change is inversely correlated with the change in ambient temperature; that is, when the ambient temperature rises, the resistance of the thermistor decreases.

[0062] The conduction degree of the transistor Q1 is positively correlated with the change in the resistance of the thermistor. That is, when the resistance of the thermistor decreases, the base voltage of the transistor Q1 decreases and the conduction degree weakens.

[0063] The conduction level of the transistor Q1 is inversely related to the voltage drop of the voltage divider network. That is, when the conduction level of the transistor Q1 decreases, the voltage drop of the voltage divider network increases; when the voltage drop of the voltage divider network increases, the input voltage of the control pin increases; when the input voltage of the control pin increases, the control module controls the power supply current supplied to the vehicle's LED lighting components to decrease.

[0064] In the temperature control module: the voltage divider network includes a sixth resistor R6 and a seventh resistor R7;

[0065] Wherein: one end of the sixth resistor R6 is connected in sequence to one end of the thermistor TR1 and one end of the ninth capacitor C9, and is also connected to the negative terminal of the first Zener diode Z1 and the parallel connection of the fourth resistor R4 and the fifth resistor R5; the other parallel connection of the fourth resistor R4 and the fifth resistor R5 is connected to one end of the fourth capacitor C4 in the LC filter unit; the positive terminal of the first Zener diode Z1 and the other end of the ninth capacitor C9 are both grounded; the other end of the sixth resistor R6 is connected to the emitter of the transistor Q1; the other end of the thermistor TR1 is simultaneously connected to the base of the transistor Q1 and one end of the seventh resistor R7; the other end of the seventh resistor R7 is grounded; the collector of the transistor Q1 is connected in sequence to the control pin of the control chip, one end of the eighth resistor R8, and one end of the tenth capacitor C10; the other ends of the eighth resistor R8 and the other ends of the tenth capacitor C10 are both grounded.

[0066] Specifically:

[0067] Voltage divider network: R6 and R7 form a voltage divider network.

[0068] TR1 (NTC thermistor): Monitors the ambient temperature of the vehicle's LED lighting components or PCB board (the drive control circuit is integrated on the PCB board). Its resistance changes with temperature, thus affecting the working state of transistor Q1.

[0069] Q1 (PNP transistor): The conduction level is adjusted according to the resistance change of the thermistor TR1, which in turn affects the voltage drop of the voltage divider network.

[0070] C9 and C10: Used for filtering and smoothing signals to ensure voltage stability.

[0071] R4 and R5 (voltage divider and current limiting resistors): Together with the first Zener diode Z1, they form a voltage regulation unit to ensure the stability of the output current of the control chip.

[0072] The control module is used to dynamically adjust the power supply current supplied to the vehicle's LED lighting components based on the magnitude of the input voltage at the control pin.

[0073] The vehicle LED lighting assembly includes a first LED light DL1; in the control module:

[0074] The second and third pins of the control chip UC1 are grounded. The fifth pin is connected in sequence to the sixth pin of the control chip UC1, the positive terminal of the first diode D1, and then to one end of the second inductor L2. The other end of the second inductor L2 is connected in sequence to one end of the second filter capacitor T2, the parallel connection of the eleventh capacitor C11 and the sixth capacitor C6, and the negative terminal of the first LED DL1. The other parallel connection of the eleventh capacitor C11 and the sixth capacitor C6 is simultaneously connected to one end of the first filter capacitor T1 and the positive terminal of the first LED DL1, and then connected to the first pin SET of the control chip UC1. The other ends of the second filter capacitor T2 and the first filter capacitor T1 are both grounded. The negative terminal of the first diode D1 is connected to the eighth pin of the control chip UC1, i.e., the power supply pin VIN.

[0075] The control module further includes an RC absorption unit, which includes a second resistor R2 and a third filter capacitor T3; one end of the second resistor R2 is connected to one end of the third filter capacitor T3; the other end of the third filter capacitor T3 is grounded; the fifth and sixth pins of the control chip UC1 are both connected to the other end of the second resistor R2.

[0076] RC absorption units are used to reduce high-frequency interference in control chips and improve the electromagnetic compatibility (EMC) performance of circuits.

[0077] In this embodiment, the control chip UC1 is model AL8860MP-13.

[0078] Specifically:

[0079] UC1: The core control component, responsible for dynamically adjusting the power supply current to the vehicle's LED lighting components, ensuring current stability and adjusting based on feedback from the temperature control module.

[0080] D1 (Schottky diode): As a freewheeling diode, it provides a discharge path for the energy storage inductor L2, ensuring the continuity of current in the circuit.

[0081] L2 (inductor): an energy storage element that works with the control chip to achieve constant current output.

[0082] T1 and T2 (filter capacitors): used to filter out voltage spikes in the output section of the control chip, making the output current more stable.

[0083] C6, C11: Connected in parallel with the LED to filter out bypass noise and maintain stable output current.

[0084] The drive control circuit also includes:

[0085] The feedback module is used to detect the actual current passing through the vehicle's LED lighting components and feed it back to the control module;

[0086] The feedback module includes:

[0087] The first resistor R1 and the third resistor R3 are connected in parallel. One parallel terminal of the first resistor R1 and the third resistor R3 is simultaneously connected to the positive terminal of the first LED DL1 and the first pin SET of the control chip UC1, and the other parallel terminal is simultaneously connected to the negative terminal of the first diode D1 and the power supply pin VIN of the control chip UC1.

[0088] The control module is also used to adjust the power supply current to the vehicle's LED lighting components based on the actual current fed back by the feedback module, so that it is stabilized at the set current value.

[0089] Specifically:

[0090] R1, R3: Connected in parallel to detect the actual current passing through the vehicle's LED lighting components and feed it back to the control module.

[0091] Feedback Mechanism: After receiving the actual current information from the feedback module, the control module compares the actual current with the preset target current. If the actual current deviates from the target value, the control module adjusts the output current to correct the deviation, ensuring that the LED light operates at the designed current and maintains consistent and stable brightness.

[0092] The following describes the operation of the drive control circuit when the ambient temperature rises and when the ambient temperature falls:

[0093] I. Working process when ambient temperature rises

[0094] 1. Temperature control module

[0095] Thermistor TR1: When the ambient temperature rises, the resistance of the NTC thermistor TR1 decreases.

[0096] Transistor Q1: As the resistance of TR1 decreases, the base voltage of transistor Q1 drops, thereby weakening the conduction of Q1 (i.e., Q1 transitions from saturation to cutoff).

[0097] Voltage divider network (R6, R7): As the conduction of Q1 decreases, the voltage drop across the voltage divider network increases. Specifically, the voltage across R6 increases, while the voltage difference between the emitter and base of Q1 decreases.

[0098] 2. Control Module

[0099] Control chip UC1: As the voltage drop across the voltage divider network increases, the voltage input to the UC1 control pin also increases. According to the UC1 design, when the control pin voltage increases, it reduces the output current (i.e., outputs the current at a new set value) to protect the circuit from high temperatures.

[0100] First LED DL1: As UC1 reduces its output current, the current supplied to the first LED DL1 also decreases, resulting in a decrease in the brightness of DL1, thereby reducing the heat generated on the PCB board.

[0101] 3. Feedback Module

[0102] Sampling resistors (R1, R3): The feedback module detects the actual current flowing through DL1 and feeds this information back to the control module.

[0103] Control adjustment: The control module further fine-tunes the output current based on the feedback information to ensure that it stabilizes at the new set value and maintains the stable operation of the circuit.

[0104] II. Working process when the ambient temperature decreases

[0105] 1. Temperature control module

[0106] Thermistor TR1: When the ambient temperature decreases, the resistance of NTC thermistor TR1 gradually increases.

[0107] Transistor Q1: As the resistance of TR1 increases, the base voltage of Q1 rises, which enhances the conduction of Q1 (i.e., Q1 is more inclined to saturation).

[0108] Voltage divider network (R6, R7): As the conduction of Q1 increases, the voltage drop across the voltage divider network decreases. Specifically, the voltage across R6 decreases, while the voltage difference between the emitter and base of Q1 increases.

[0109] 2. Control Module

[0110] Control chip UC1: As the voltage drop across the voltage divider network decreases, the voltage input to the UC1 control pin also decreases. According to the UC1 design, when the control pin voltage decreases, it increases the output current to restore the normal brightness of the first LED DL1.

[0111] First LED DL1: As UC1 increases its output current, the current supplied to the first LED DL1 also increases, causing the brightness of DL1 to return to normal. At the same time, the circuit continues to monitor and adjust the temperature to prevent overheating.

[0112] 3. Feedback Module

[0113] Sampling resistors (R1, R3): The feedback module detects the actual current flowing through the DL1 lamp and feeds this information back to the control module.

[0114] Control and Adjustment: The control module further fine-tunes the output current based on feedback information to ensure that it remains stable at the original set value, thereby guaranteeing the consistency of lighting effects and the stability of the system.

[0115] In summary, the temperature control module, control module, and feedback module work together to automatically adjust the brightness and current of the LED lights when the ambient temperature changes. This ensures that the system can protect itself from damage under high-temperature conditions and quickly return to normal performance after the temperature recovers, providing a consistent lighting effect. This design not only extends the lifespan of the LED lights but also improves the energy efficiency ratio of the entire circuit, reduces energy consumption, and aligns with the trend of energy conservation and environmental protection.

[0116] Additionally, it's important to explain that the primary purpose of the feedback module is to stabilize the drive current of the first LED (DL1), ensuring its performance under normal operating conditions. The temperature control module, on the other hand, provides over-temperature protection, automatically adjusting the current in abnormally high temperatures to protect the circuit and LED from damage. R1 and R3 are unaffected by temperature; they function as long as the circuit is powered on. The temperature control module, however, only intervenes when a temperature change is detected. R1 and R3 directly participate in current detection and feedback, which is part of routine operation. The temperature control module, however, is an additional safety feature, indirectly affecting the output current by changing the feedback voltage on the U1 control pin. These two mechanisms work together to ensure the normal operating performance of the LED while providing necessary over-temperature protection, thus improving the overall reliability and safety of the circuit.

[0117] In the drive control circuit of this utility model: the power processing module is used to connect to the positive power supply, process it, and then input it to the temperature control module; the temperature control module is used to monitor the ambient temperature of the vehicle's LED lighting components and adjust the input voltage of the control pin of the control chip based on the change in ambient temperature; the control module is used to dynamically adjust the power supply current supplied to the vehicle's LED lighting components according to the magnitude of the input voltage of the control pin; that is, this utility model, by monitoring the ambient temperature of the vehicle's LED lighting components in real time and automatically adjusting the input voltage of the control pin of the control chip based on the change in ambient temperature, thereby adjusting the power supply current of the vehicle's LED lighting components, avoids the overheating or insufficient performance problems that may be caused by traditional fixed parameter settings. Especially in high-temperature environments, it effectively prevents component damage and shortened lifespan caused by excessive temperature.

[0118] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0119] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0120] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0121] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A drive control circuit for vehicle LED lighting components, characterized in that, include: Power processing module, temperature control module, and control module containing control chip; The power processing module is used to connect to the positive power supply, process it, and then input it into the temperature control module. The temperature control module is used to monitor the ambient temperature of the vehicle's LED lighting components and adjust the input voltage of the control pin of the control chip based on changes in the ambient temperature; the temperature control module includes: a voltage divider network, a thermistor TR1, and a transistor Q1; The thermistor is used to monitor the ambient temperature of the vehicle's LED lighting components. Its resistance change is inversely correlated with the change in ambient temperature; that is, when the ambient temperature rises, the resistance of the thermistor decreases. The conduction degree of the transistor Q1 is positively correlated with the change in the resistance of the thermistor. That is, when the resistance of the thermistor decreases, the base voltage of the transistor Q1 decreases and the conduction degree weakens. The conduction level of transistor Q1 is inversely related to the voltage drop of the voltage divider network. That is, when the conduction level of transistor Q1 decreases, the voltage drop of the voltage divider network increases; when the voltage drop of the voltage divider network increases, the input voltage of the control pin increases; when the input voltage of the control pin increases, the control module controls the power supply current supplied to the vehicle's LED lighting components to decrease. The control module is used to dynamically adjust the power supply current supplied to the vehicle's LED lighting components based on the magnitude of the input voltage at the control pin.

2. The driving control circuit for vehicle LED lighting components according to claim 1, characterized in that, The drive control circuit also includes: The feedback module is used to detect the actual current passing through the vehicle's LED lighting components and feed it back to the control module; The control module is also used to adjust the power supply current to the vehicle's LED lighting components based on the actual current fed back by the feedback module, so that it is stabilized at the set current value.

3. The drive control circuit for vehicle LED lighting components according to claim 2, characterized in that, The power processing module includes: The transient voltage suppression unit is connected to the positive power supply and is used to clamp the transient voltage below a safe voltage when the input of the positive power supply exceeds a set threshold. The power input processing unit is connected to the positive power supply to prevent the polarity of the positive power supply VCC from being reversed and to filter out high-frequency noise and pulse interference in the input power supply. The LC filter unit is used to smooth the power output from the power input processing unit and input it to the control module.

4. The drive control circuit for a vehicle LED lighting assembly according to claim 3, characterized in that, The transient voltage suppression unit includes a first TVS transistor (TVS1); the power input processing unit includes a first capacitor (C1) and a reverse connection protection diode (DS1). The positive power supply is connected in sequence to one end of the first TVS transistor (TVS1) and one end of the first capacitor (C1), and then connected to the positive terminal of the reverse polarity protection diode (DS1); the other end of the first TVS transistor (TVS1) and the other end of the first capacitor (C1) are both grounded; the negative terminal of the reverse polarity protection diode (DS1) is connected to the LC filter unit.

5. A drive control circuit for a vehicle LED lighting assembly according to claim 4, characterized in that, The LC filter unit includes: The second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the seventh capacitor C7, the eighth capacitor C8 and the first inductor L1; The negative terminal of the reverse polarity protection diode DS1 is connected in sequence to one end of the seventh capacitor C7, one end of the second capacitor C2, and one end of the fourth capacitor C4, and then connected to one end of the first inductor L1; the other end of the first inductor L1 is connected in sequence to one end of the eighth capacitor C8, one end of the third capacitor C3, and one end of the fifth capacitor C5, and then connected to the power supply pin VIN of the control chip; the other ends of the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the seventh capacitor C7, and the eighth capacitor C8 are all grounded.

6. A drive control circuit for a vehicle LED lighting assembly according to claim 5, characterized in that, In the temperature control module: the voltage divider network includes a sixth resistor R6 and a seventh resistor R7; Wherein: one end of the sixth resistor R6 is connected in sequence to one end of the thermistor TR1 and one end of the ninth capacitor C9, and is also connected to the negative terminal of the first Zener diode Z1 and the parallel connection of the fourth resistor R4 and the fifth resistor R5; the other parallel connection of the fourth resistor R4 and the fifth resistor R5 is connected to one end of the fourth capacitor C4 in the LC filter unit; the positive terminal of the first Zener diode Z1 and the other end of the ninth capacitor C9 are both grounded; the other end of the sixth resistor R6 is connected to the emitter of the transistor Q1; the other end of the thermistor TR1 is simultaneously connected to the base of the transistor Q1 and one end of the seventh resistor R7; the other end of the seventh resistor R7 is grounded; the collector of the transistor Q1 is connected in sequence to the control pin of the control chip, one end of the eighth resistor R8, and one end of the tenth capacitor C10; the other ends of the eighth resistor R8 and the other ends of the tenth capacitor C10 are both grounded.

7. A drive control circuit for a vehicle LED lighting assembly according to claim 6, characterized in that, The vehicle LED lighting assembly includes a first LED light DL1; in the control module: The second and third pins of the control chip UC1 are grounded. The fifth pin is connected in sequence to the sixth pin of the control chip UC1, the positive terminal of the first diode D1, and then to one end of the second inductor L2. The other end of the second inductor L2 is connected in sequence to one end of the second filter capacitor T2, the parallel connection of the eleventh capacitor C11 and the sixth capacitor C6, and the negative terminal of the first LED DL1. The other parallel connection of the eleventh capacitor C11 and the sixth capacitor C6 is simultaneously connected to one end of the first filter capacitor T1 and the positive terminal of the first LED DL1, and then connected to the first pin SET of the control chip UC1. The other ends of the second filter capacitor T2 and the first filter capacitor T1 are both grounded. The negative terminal of the first diode D1 is connected to the eighth pin of the control chip UC1, i.e., the power supply pin VIN.

8. A drive control circuit for a vehicle LED lighting assembly according to claim 7, characterized in that, The control module further includes an RC absorption unit, which includes a second resistor R2 and a third filter capacitor T3; one end of the second resistor R2 is connected to one end of the third filter capacitor T3; the other end of the third filter capacitor T3 is grounded; the fifth and sixth pins of the control chip UC1 are both connected to the other end of the second resistor R2.

9. A drive control circuit for a vehicle LED lighting assembly according to claim 7, characterized in that, The feedback module includes: The first resistor R1 and the third resistor R3 are connected in parallel. One parallel terminal of the first resistor R1 and the third resistor R3 is simultaneously connected to the positive terminal of the first LED DL1 and the first pin SET of the control chip UC1, and the other parallel terminal is simultaneously connected to the negative terminal of the first diode D1 and the power supply pin VIN of the control chip UC1.

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