Steering lamp control circuit

Abstract

The utility model discloses a steering lamp control circuit, which relates to the technical field of automobile signal lamp control, and comprises a driving circuit, a signal lamp control circuit and a signal lamp control circuit, the steering lamp control circuit is used for controlling the input level of the driving circuit; the driving circuit comprises a first triode, a second triode and a third triode, wherein the first triode is communicated with the steering lamp control circuit through a base; when the steering lamp control circuit outputs a high level, the first triode is conducted; and the second triode is used for being connected with the collector electrode of the first triode through a base electrode and connected with the steering lamp LED lamp group through the collector electrode. According to the utility model, the turning-on and turning-off of the LED lamp group of the steering lamp can be effectively controlled, the accurate transmission of steering signals is ensured, and the stability and safety of the circuit are ensured at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile signal light control, and in particular provides a turn signal light control circuit. Background Art

[0002] At present, cars are equipped with turn signal lights on the head, tail, even on the fenders or rearview mirrors to indicate the intention of turning or changing lanes. The turn signal lights are of great significance to ensure the safety of drivers. Turn signal lights are active safety parts of cars. During use, there are problems such as inaccurate control of turn signal lights, poor circuit stability, easy interference or high failure rate. These problems may affect driving safety and even cause traffic accidents. Utility Model Content

[0003] The utility model aims to provide a turn signal control circuit, which can effectively control the lighting and extinguishing of the turn signal LED light group, ensure the accurate transmission of the turn signal, and ensure the stability and safety of the circuit.

[0004] To achieve the above object, the utility model provides a turn signal control circuit, comprising:

[0005] Driving circuit: used to drive the turn signal to light up and turn off;

[0006] Turn signal control circuit: used to control the input level of the drive circuit;

[0007] The driving circuit comprises: a first transistor: used to connect the turn signal control circuit through the base; when the turn signal control circuit outputs a high level, the first transistor is turned on;

[0008] The second transistor is used to be connected to the collector of the first transistor through the base, and connected to the turn signal LED lamp group through the collector.

[0009] Through the above technical features, the turn signal control circuit is responsible for controlling the input level of the drive circuit. When the turn signal needs to be turned on, the turn signal control circuit outputs a high level, the base of the first transistor receives a sufficiently high voltage, the first transistor is turned on, and the current can flow to the emitter through the collector of the first transistor. The current flows through the collector of the first transistor and is transmitted to the base of the second transistor, so that the emitter of the second transistor is forward-biased and turned on. The collector of the second transistor is connected to the turn signal LED light group. Therefore, when the second transistor is turned on, the current can flow to the LED light group to make it light up; when the turn signal is not needed to be turned on, the turn signal control circuit outputs a low level, the first transistor is turned off, and the second transistor is also turned off, and the LED light group is turned off. Therefore, the present application accurately controls the input level of the drive circuit through the turn signal control circuit, which can ensure that the turn signal is turned on and off accurately, achieve precise control, and ensure the stability and safety of the circuit.

[0010] Preferably, the turn signal control circuit comprises a first resistor, a second resistor and a control chip;

[0011] The first ends of the first resistor and the second resistor are connected in parallel to pin six of the control chip, and the second ends of the first resistor and the second resistor are connected in parallel to pin four of the control chip and the signal input end of the drive circuit respectively.

[0012] Through the above technical features, the control chip is the core of the turn signal control circuit, receives the turn signal or other input signal from the vehicle system, and generates corresponding output according to these signals; the first resistor and the second resistor are connected in parallel to the pin six of the control chip, which play the role of voltage division and current limiting, the second end of the first resistor is connected to the pin four of the control chip, and the second end of the second resistor is directly connected to the signal input end of the drive circuit, the control chip can sense the state of the external signal through the voltage difference between the pin four and the pin six, and output the corresponding control signal to the drive circuit through the pin six, after the drive circuit receives the signal from the control chip, it controls the conduction and cutoff of the first triode and the second triode according to the level state of the signal, and then controls the on and off of the turn signal. Therefore, by using the control chip and the resistor in combination, more accurate and flexible control of the turn signal can be achieved. And the first resistor and the second resistor play the role of current limiting and voltage division, protecting the control chip and the drive circuit from the influence of adverse factors such as overcurrent or overvoltage, and improving the stability and reliability of the entire circuit.

[0013] Preferably, the turn signal control circuit further includes a voltage stabilizing diode, a third resistor, a first diode, a second diode, a first inductor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor and a seventh capacitor;

[0014] The first end of the voltage stabilizing diode is connected in parallel with the voltage input end and the first end of the third capacitor to the first end of the first diode, and the second end of the voltage stabilizing diode and the first end of the seventh capacitor are connected in parallel to the ground;

[0015] The second end of the third capacitor is connected in series with the second end of the seventh capacitor, and the second end of the first diode is connected in parallel with the first end of the third resistor, the first end of the fourth capacitor and the first end of the first inductor;

[0016] The second end of the first inductor is connected in parallel with the first end of the fifth capacitor and the first end of the sixth capacitor, the first end of the sixth capacitor and the first end of the second diode are connected in parallel to pin 6 of the control chip, and the second end of the second diode is connected in parallel to pin 1 of the control chip;

[0017] The second end of the third resistor, the second end of the fourth capacitor, the second end of the fifth capacitor and the second end of the sixth capacitor are connected to the ground in parallel.

[0018] Through the above technical features, the voltage stabilizing diode is connected with the voltage input terminal and the third capacitor in parallel to the first end of the first diode, which plays a role in stabilizing the input voltage. When the input voltage fluctuates, the voltage stabilizing diode can absorb or release excess energy to keep the output voltage at a relatively stable level; the third capacitor, the first inductor, the fourth capacitor, the fifth capacitor, and the sixth capacitor form a filter circuit, which together play a role in filtering, can filter out high-frequency noise and clutter in the input power supply, and provide a clean and stable power supply environment for the control chip; the first diode, the second diode, and the sixth capacitor are connected in parallel to the pin 6 of the control chip to form a protection circuit. When the input voltage is too high, the first diode can be turned on to discharge the excess voltage to the ground to protect the control chip from damage, while the second diode plays a role in reverse protection to prevent the negative voltage from damaging the control chip; the third resistor is connected in series between the filter circuit and the ground to play a role in current limiting. By adjusting the resistance value of the third resistor, the current in the filter circuit can be controlled to ensure the stable operation of the circuit. Therefore, the turn signal control circuit further improves the stability and reliability of the circuit through the role of the above components.

[0019] Preferably, the turn signal LED lamp group includes a first capacitor, a second capacitor, an eighth capacitor, a ninth capacitor, a first LED unit, a second LED unit, a third LED unit, a fourth LED unit and a second inductor;

[0020] The first end of the first capacitor and the first end of the first LED unit are connected in parallel to the pin 4 of the control chip, and the second end of the first capacitor and the first end of the second capacitor and the second end of the first LED unit and the first end of the second LED unit are connected in parallel;

[0021] The second end of the second capacitor is connected in parallel with the first end of the eighth capacitor and the second end of the second LED unit is connected in parallel with the first end of the third LED unit;

[0022] The second end of the eighth capacitor is connected in parallel with the first end of the ninth capacitor and the second end of the third LED unit is connected in parallel with the first end of the fourth LED unit;

[0023] The second end of the ninth capacitor is connected in parallel with the second end of the fourth LED unit and then connected in series with the second inductor to the ground.

[0024] Through the above technical features, the pin 4 of the control chip provides the initial voltage to the first LED unit through the first capacitor. The first capacitor plays the role of filtering and stabilizing the voltage, ensuring that the LED unit can work in a stable and smooth voltage environment. In addition, capacitors (the second capacitor, the eighth capacitor and the ninth capacitor) are connected between each LED unit. These capacitors can further filter out noise and clutter in the current, ensuring the stable operation of the LED unit, and the stable voltage and current environment helps to extend the service life of the LED and reduce damage caused by excessively high or low voltage. At the end of the LED lamp group, the second end of the fourth LED unit is connected in series with the second inductor and then grounded. The use of the second inductor effectively suppresses the current mutation when the LED lamp group is turned off, that is, when the switch is disconnected, the magnetic field in the inductor will prevent the current from decreasing rapidly, thereby reducing the flickering phenomenon when the LED lamp group is turned off, and improving driving comfort and safety.

[0025] Preferably, the driving circuit further includes a fourth resistor, a sixth resistor, a seventh resistor and a tenth capacitor;

[0026] The first ends of the fourth resistor, the sixth resistor and the seventh resistor are connected in parallel to the collector of the second transistor, and the second ends of the fourth resistor, the sixth resistor and the seventh resistor and the first end of the tenth capacitor are connected in parallel to the turn signal LED lamp group;

[0027] The emitter of the first transistor and the second end of the tenth capacitor are grounded respectively, and the emitter of the second transistor is connected to the voltage input end.

[0028] Through the above technical features, the fourth resistor, the sixth resistor and the seventh resistor are connected in parallel between the collector of the second transistor and the turn signal LED lamp group, playing the role of voltage division and current limiting. By adjusting the resistance values ​​of these resistors, the current flowing to the LED lamp group can be controlled to prevent the LED lamp group from being damaged due to excessive current, thereby improving the safety of the circuit. The tenth capacitor is connected in parallel at both ends of the LED lamp group to play a filtering role, which can filter out high-frequency noise and clutter in the current, so that the LED lamp group can obtain a more stable and purer current supply, improve the stability of the LED lamp group, and help extend the service life of the LED.

[0029] Preferably, the first transistor is an NPN transistor.

[0030] Through the above technical features, when the turn signal control circuit outputs a high level, the base of the NPN transistor (as the first transistor) is forward biased, causing the transistor to be turned on. At this time, current flows in from the voltage input terminal, passes through the collector and emitter of the NPN transistor, and then flows to the turn signal LED lamp group. Due to the amplification effect of the NPN transistor, even if the base current is very small, a large current can be generated at the collector, thereby driving the LED lamp group to emit light, ensuring that the LED lamp group can emit light normally and stably. In addition, the NPN transistor has a fast response speed, low energy consumption, and is easy to control and implement.

[0031] Preferably, the second transistor is a PNP transistor.

[0032] Through the above technical features, the PNP transistor plays an additional role of protection and current limiting in the circuit. When the current is too large, due to the base-emitter reverse bias and collector-base forward bias characteristics of the PNP transistor, it will limit the further increase of current, thereby protecting the LED lamp group and other circuit components from damage.

[0033] Preferably, the control chip adopts model NCV7683.

[0034] Through the above technical features, the multi-channel linear constant current driver of NCV7683 can provide stable current output, ensure the stable operation of the LED lamp group, reduce LED flickering or damage caused by current fluctuations, and has strong reliability, good flexibility and low power consumption, which can meet the needs of various types of automotive turn signal systems.

[0035] Compared with the prior art, the beneficial effects of the utility model are:

[0036] (1) The driving circuit of the present application effectively realizes the lighting and extinguishing control of the turn signal LED light group through the combination of the first transistor and the second transistor, ensuring that the LED light group can respond quickly and accurately according to the output level of the turn signal control circuit;

[0037] (2) The turn signal control circuit of the present application provides a stable voltage and current supply through components such as resistors, voltage regulator diodes, diodes, inductors, capacitors, etc., ensuring the normal operation of the LED light group while improving the reliability and safety of the circuit;

[0038] (3) This application realizes stable power supply and brightness control of the LED lamp group through the combination of multiple LED units and capacitors and inductors, ensuring that the LED lamp group can emit bright and stable light under various working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of a turn signal control circuit provided by an embodiment of the utility model;

[0040] Figure 2 This is a schematic diagram of a driving circuit in a turn signal control circuit provided in an embodiment of the utility model.

[0041] In the figure: Q1-first transistor, D2-second diode, R2-second resistor, D1-first diode, C1-first capacitor, C2-second capacitor, C3-third capacitor, C4-fourth capacitor, C5-fifth capacitor, C6-sixth capacitor, C7-seventh capacitor, C8-eighth capacitor, C9-ninth capacitor, C10-tenth capacitor, R1-first resistor, R3-third resistor, Q2-second transistor, DZ1-voltage regulator diode, U1-control chip. DETAILED DESCRIPTION

[0042] The following are specific embodiments of the present application and combined with the accompanying drawings to further describe the technical solution of the present application, but the present application is not limited to these embodiments.

[0043] See also Figure 1 and Figure 2 The present embodiment provides a turn signal control circuit, including: a driving circuit: used for driving the turn signal to turn on and off; a turn signal control circuit: used for controlling the input level of the driving circuit; the driving circuit includes: a first transistor Q1: used for connecting to the turn signal control circuit through the base; when the turn signal control circuit outputs a high level, the first transistor Q1 is turned on; a second transistor Q2: used for connecting to the collector of the first transistor Q1 through the base, and connected to the turn signal LED lamp group through the collector.

[0044] The driving circuit in this application uses two transistors, the first transistor Q1 (NPN transistor) and the second transistor Q2 (PNP transistor), as the main control elements. The base of the first transistor Q1 is connected to the turn signal control circuit. When the control circuit outputs a high level, the first transistor Q1 is turned on, thereby allowing current to pass through the base of the second transistor Q2. The collector of the second transistor Q2 is connected to the turn signal LED lamp group to control its lighting.

[0045] The turn signal control circuit in this application includes multiple resistors, capacitors, diodes, inductors and a control chip for generating and controlling the signal level input to the drive circuit. The control chip U1 (model NCV7683) receives and processes signals from other parts of the vehicle through its pins, and then controls the turning signal on and off by adjusting its output level.

[0046] The turn signal LED light group in this application includes multiple LED units and components such as capacitors and inductors. These components are used to ensure the stable operation of the LED light group and may provide some form of fault protection function.

[0047] This circuit can effectively ensure the stable operation of the turn signal LED light group and reduce failures caused by circuit problems by using complex control circuits and component configurations. It has stability. By accurately controlling the input level of the drive circuit, it can ensure that the turn signal lights up and turns off accurately when needed, improving the reliability of the entire system. It has a certain degree of flexibility by adjusting the parameters of the control chip or replacing some components to adapt to different vehicles or LED light groups.

[0048] Specifically, the turn signal control circuit includes a first resistor R1, a second resistor R2 and a control chip U1; the first ends of the first resistor R1 and the second resistor R2 are connected in parallel to pin six of the control chip U1, and the second ends of the first resistor R1 and the second resistor R2 are connected in parallel to pin four of the control chip U1 and the signal input end of the drive circuit respectively.

[0049] Specifically, the turn signal control circuit also includes a voltage-stabilizing diode DZ1, a third resistor R3, a first diode D1, a second diode D2, a first inductor L1, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6 and a seventh capacitor C7; the first end of the voltage-stabilizing diode DZ1 is connected in parallel with the voltage input end and the first end of the third capacitor C3 to the first end of the first diode D1, the second end of the voltage-stabilizing diode DZ1 is connected in parallel with the first end of the seventh capacitor C7 to the ground; the second end of the third capacitor C3 is connected in series with the second end of the seventh capacitor C7, and the first diode DZ1 is connected in parallel with the first end of the seventh capacitor C7. The second end of the tube D1 is connected in parallel with the first end of the third resistor R3, the first end of the fourth capacitor C4 and the first end of the first inductor L1; the second end of the first inductor L1 is connected in parallel with the first end of the fifth capacitor C5 and the first end of the sixth capacitor C6, the first end of the sixth capacitor C6 and the first end of the second diode D2 are connected in parallel to pin six of the control chip U1, and the second end of the second diode D2 is connected in parallel to pin one of the control chip U1; the second end of the third resistor R3, the second end of the fourth capacitor C4, the second end of the fifth capacitor C5 and the second end of the sixth capacitor C6 are connected in parallel to ground.

[0050] Specifically, the turn signal LED lamp group includes a first capacitor C1, a second capacitor C2, an eighth capacitor C8, a ninth capacitor C9, a first LED unit, a second LED unit, a third LED unit, a fourth LED unit and a second inductor L2; the first end of the first capacitor C1 is connected in parallel with the first end of the first LED unit to pin four of the control chip U1, the second end of the first capacitor C1 is connected in parallel with the first end of the second capacitor C2 and the second end of the first LED unit and the first end of the second LED unit; the second end of the second capacitor C2 is connected in parallel with the first end of the eighth capacitor C8 and the second end of the second LED unit and the first end of the third LED unit; the second end of the eighth capacitor C8 is connected in parallel with the first end of the ninth capacitor C9 and the second end of the third LED unit and the first end of the fourth LED unit; the second end of the ninth capacitor C9 is connected in parallel with the second end of the fourth LED unit and then connected in series with the second inductor L2 to the ground.

[0051] See also Figure 2 The driving circuit also includes a fourth resistor R4, a sixth resistor R6, a seventh resistor R7 and a tenth capacitor C10; the first ends of the fourth resistor R4, the sixth resistor R6 and the seventh resistor R7 are connected in parallel to the collector of the second transistor Q2, and the second ends of the fourth resistor R4, the sixth resistor R6 and the seventh resistor R7 and the first end of the tenth capacitor C10 are connected in parallel to the turn signal LED lamp group; the emitter of the first transistor Q1 and the second end of the tenth capacitor C10 are grounded respectively, and the emitter of the second transistor Q2 is connected to the voltage input end.

[0052] Specifically, the first transistor Q1 in the driving circuit acts as a switch. When the turn signal control circuit outputs a high level, it turns on, thereby allowing current to flow to the turn signal LED lamp group through the second transistor Q2. The second transistor Q2 acts as another switch. When the first transistor Q1 turns on, it also turns on, so that the turn signal LED lamp group is powered and lights up. Turn signal control circuit:

[0053] The first resistor R1 and the second resistor R2: used for voltage division or current limiting to protect the control chip. Control chip U1: the core control component, responsible for controlling the input level of the drive circuit according to the input signal. Other components (such as voltage stabilizing diodes, capacitors, inductors, diodes, etc.): used for auxiliary functions such as voltage stabilization, filtering, and circuit protection. Turn signal LED light group: composed of multiple LED units and capacitors and inductors, used to display turn signals.

[0054] The additional elements of the driving circuit, the fourth resistor R4, the sixth resistor R6, the seventh resistor R7 and the tenth capacitor C10 are used to further adjust the current, protect the circuit or stabilize the operation.

[0055] Working principle: The utility model uses a switch combination of multiple transistors to complete the priority lighting function of the turn signal. When the turn signal control circuit outputs a high level, the first transistor in the driving circuit is turned on. After the first transistor is turned on, the emitter of the second transistor is forward-biased and the high-level LED turn signal group is turned on. This can achieve precise control of the turn signal LED group and improve driving safety. At the same time, through reasonable circuit design, the stable operation of the circuit can be ensured and the possibility of failure can be reduced.

[0056] The specific embodiments described herein are merely examples of the present application. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways without departing from the scope defined in the present application.

Claims

1. A turn signal control circuit, characterized in that: include: Driving circuit: used to drive the turn signal light on and off; Turn signal control circuit: used to control the input level of the drive circuit; The driving circuit comprises: a first transistor: used to connect the turn signal control circuit through the base; when the turn signal control circuit outputs a high level, the first transistor is turned on; The second transistor is used to be connected to the collector of the first transistor through the base, and connected to the turn signal LED lamp group through the collector.

2. The turn signal control circuit according to claim 1, characterized in that: The turn signal control circuit comprises a first resistor, a second resistor and a control chip; The first ends of the first resistor and the second resistor are connected in parallel to pin six of the control chip, and the second ends of the first resistor and the second resistor are connected in parallel to pin four of the control chip and the signal input end of the drive circuit respectively.

3. The turn signal control circuit according to claim 2, characterized in that: The turn signal control circuit further includes a voltage stabilizing diode, a third resistor, a first diode, a second diode, a first inductor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor and a seventh capacitor; The first end of the voltage stabilizing diode is connected in parallel with the voltage input end and the first end of the third capacitor to the first end of the first diode, and the second end of the voltage stabilizing diode and the first end of the seventh capacitor are connected in parallel to the ground; The second end of the third capacitor is connected in series with the second end of the seventh capacitor, and the second end of the first diode is connected in parallel with the first end of the third resistor, the first end of the fourth capacitor and the first end of the first inductor; The second end of the first inductor is connected in parallel with the first end of the fifth capacitor and the first end of the sixth capacitor, the first end of the sixth capacitor and the first end of the second diode are connected in parallel to pin 6 of the control chip, and the second end of the second diode is connected in parallel to pin 1 of the control chip; The second end of the third resistor, the second end of the fourth capacitor, the second end of the fifth capacitor and the second end of the sixth capacitor are connected to the ground in parallel.

4. The turn signal control circuit according to claim 2, characterized in that: The turn signal LED lamp group includes a first capacitor, a second capacitor, an eighth capacitor, a ninth capacitor, a first LED unit, a second LED unit, a third LED unit, a fourth LED unit and a second inductor; The first end of the first capacitor and the first end of the first LED unit are connected in parallel to the pin 4 of the control chip, and the second end of the first capacitor and the first end of the second capacitor and the second end of the first LED unit and the first end of the second LED unit are connected in parallel; The second end of the second capacitor is connected in parallel with the first end of the eighth capacitor and the second end of the second LED unit is connected in parallel with the first end of the third LED unit; The second end of the eighth capacitor is connected in parallel with the first end of the ninth capacitor and the second end of the third LED unit is connected in parallel with the first end of the fourth LED unit; The second end of the ninth capacitor is connected in parallel with the second end of the fourth LED unit and then connected in series with the second inductor to the ground.

5. The turn signal control circuit according to claim 1, characterized in that: The driving circuit further includes a fourth resistor, a sixth resistor, a seventh resistor and a tenth capacitor; The first ends of the fourth resistor, the sixth resistor and the seventh resistor are connected in parallel to the collector of the second transistor, and the second ends of the fourth resistor, the sixth resistor and the seventh resistor and the first end of the tenth capacitor are connected in parallel to the turn signal LED lamp group; The emitter of the first transistor and the second end of the tenth capacitor are grounded respectively, and the emitter of the second transistor is connected to the voltage input end.

6. The turn signal control circuit according to claim 1, characterized in that: The first transistor is an NPN transistor.

7. The turn signal control circuit according to claim 1, characterized in that: The second transistor is a PNP transistor.

8. The turn signal control circuit according to claim 2, characterized in that: The control chip used is model NCV7683.

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