Lamp control circuit, lamp control system and vehicle

Abstract

The utility model discloses a lamp control circuit, a lamp control system and a vehicle, in the lamp control circuit, the input end of a power supply module is used for being electrically connected with a function driving line and receiving a driving signal, and the output end of the power supply module is used for being electrically connected with the positive electrode of an LED module; the first connecting end of the control module is electrically connected with the output end of the power supply module, the second connecting end of the control module is grounded, and the control end of the control module is used for being electrically connected with a PWM line, receiving a PWM signal and outputting a control signal based on the PWM signal when the driving signal is a high-level signal; the first connecting end of the driving module is used for being electrically connected with the negative electrode of the LED module, the second connecting end of the driving module is grounded, the control end of the driving module is electrically connected with the output end of the control module, and the driving module is used for controlling the LED module based on the control signal. The control module can carry out on-off control and brightness adjustment on the LED module based on the driving signal and the PWM signal, so that the light animation effect is achieved, the control scheme is simpler, and the manufacturing cost is saved.

Description

Technical Field

[0001] This application relates to the field of LED lighting technology, and in particular to a lighting control circuit, a lighting control system, and a vehicle. Background Technology

[0002] With the rapid development of intelligent lighting control technology, the application of lighting animations in daily life is becoming increasingly widespread. For example, in intelligent automotive design, there is a need to design a welcoming lighting function, providing illumination or lighting animations when passengers get in and out of the vehicle through specific lighting designs, thereby enhancing safety and the user experience. In existing lighting control processes, a microcontroller unit (MCU) is typically designed into the lighting control circuit connected to the LED module. The MCU, based on control signals output from an external controller, controls the LED module to turn on and off and adjust brightness according to preset control instructions, thus achieving lighting animation effects. This approach requires a MCU to receive control commands and execute control operations within the lighting control circuit, resulting in a complex overall circuit design. Furthermore, the software control of the LED module by the MCU requires development and testing, leading to high manufacturing costs. Utility Model Content

[0003] This application provides a lamp control circuit, a lamp control system, and a vehicle to solve the problem of numerous control devices and high manufacturing costs in existing lamp control circuits.

[0004] A lamp control circuit includes a power supply module, a control module, and a drive module;

[0005] The input terminal of the power supply module is used to electrically connect to the functional drive line and receive the drive signal transmitted by the functional drive line. The output terminal of the power supply module is used to electrically connect to the positive terminal of the LED module.

[0006] The first connection terminal of the control module is electrically connected to the output terminal of the power supply module, the second connection terminal of the control module is grounded, and the control terminal of the control module is used to be electrically connected to the PWM line to receive the PWM signal transmitted by the PWM line. When the drive signal is a high-level signal, the control signal is output based on the PWM signal.

[0007] The first connection terminal of the driving module is electrically connected to the negative terminal of the LED module, the second connection terminal of the driving module is grounded, and the control terminal of the driving module is electrically connected to the output terminal of the control module for controlling the LED module based on the control signal.

[0008] Preferably, the control module includes a first switching transistor, a second switching transistor, a first resistor, and a second resistor;

[0009] The first connection terminal of the second switching transistor is electrically connected to the output terminal of the power supply module through the second resistor. The second connection terminal of the second switching transistor is grounded. The control terminal of the second switching transistor is used to be electrically connected to the PWM line to receive the PWM signal transmitted by the PWM line. When the drive signal is a high-level signal, the transistor is turned on or off based on the PWM signal.

[0010] The first connection terminal of the first switch is electrically connected to the output terminal of the power supply module through the first resistor. The second connection terminal of the first switch is grounded. The control terminal of the first switch is electrically connected to the connection node between the second switch and the first resistor. It is used to turn off when the second switch is turned on and turn on when the second switch is turned off, and output a control signal.

[0011] The connection point between the first connection terminal of the first switching transistor and the first resistor is electrically connected to the control terminal of the drive module.

[0012] Preferably, the control module further includes a first filter circuit and a voltage regulator circuit;

[0013] The first terminal of the voltage regulator circuit is electrically connected to the PWM line, and the second terminal of the voltage regulator circuit is electrically connected to the control terminal of the second switching transistor.

[0014] The first terminal of the first filter circuit is electrically connected to the PWM line and the first terminal of the voltage regulator circuit, and the second terminal of the first filter circuit is grounded.

[0015] Preferably, the power supply module includes a second filter circuit and a reverse connection protection circuit;

[0016] The first end of the reverse connection protection circuit is used to be electrically connected to the functional drive line, and the second end of the reverse connection protection circuit is electrically connected to the positive terminal of the LED module and the first connection end of the control module.

[0017] The first terminal of the second filter circuit is electrically connected to the first terminal of the functional drive line and the reverse connection protection circuit, and the second terminal of the second filter circuit is grounded.

[0018] Preferably, the reverse connection protection circuit includes a third resistor, a fourth resistor, a reverse connection protection switching transistor, a first Zener diode, and a first capacitor;

[0019] The first end of the third resistor is used to be electrically connected to the power supply end, and the second end of the third resistor is grounded through the fourth resistor;

[0020] The first connection terminal of the reverse connection protection switch tube is used to electrically connect to the functional drive line, the second connection terminal of the reverse connection protection switch tube is used to electrically connect to the power supply terminal, and the control terminal of the reverse connection protection switch tube is electrically connected to the connection node between the third resistor and the fourth resistor.

[0021] The anode of the first Zener diode is electrically connected to the control terminal of the reverse connection protection switch, and the cathode of the first Zener diode is electrically connected to the second connection terminal of the reverse connection protection switch.

[0022] The first terminal of the first capacitor is electrically connected to the control terminal of the reverse connection protection switch, and the second terminal of the first capacitor is electrically connected to the second connection terminal of the reverse connection protection switch.

[0023] The second connection terminal of the reverse connection protection switch tube is also electrically connected to the positive terminal of the LED module and the first connection terminal of the control module.

[0024] Preferably, the LED module includes at least one LED unit, and the positive terminal of each LED unit is electrically connected to the output terminal of the power supply module;

[0025] The driving module includes at least one driving unit;

[0026] The first connection terminal of each driving unit is electrically connected to the negative electrode of an LED unit, the second connection terminal of each driving unit is grounded, and the control terminal of each driving unit is electrically connected to the output terminal of the control module for control based on the control signal.

[0027] Preferably, the drive module further includes a third switching transistor;

[0028] The first connection terminal of the third switch is electrically connected to the output terminal of the control module, the second connection terminal of the third switch is grounded, and the control terminal of the third switch is electrically connected to at least one of the drive units for overcurrent protection of at least one of the drive units.

[0029] Preferably, each of the driving units includes a fourth switch, a fifth resistor, a sixth resistor, a seventh resistor, and a second capacitor;

[0030] The first connection terminal of the fourth switch is used to be electrically connected to the negative terminal of one of the LED units;

[0031] The second connection terminal of the fourth switch is grounded through the fifth resistor, and the second connection terminal of the fourth switch is also electrically connected to the control terminal of the third switch through the sixth resistor;

[0032] The control terminal of the fourth switch is electrically connected to the output terminal of the control module through the seventh resistor, and the control terminal of the fourth switch is also grounded through the second capacitor.

[0033] A lighting control system includes a controller, an LED module, and the aforementioned lighting control circuit;

[0034] The controller is electrically connected to the input terminal of the power supply module via a functional drive line, and outputs a drive signal to the power supply module; the controller is also electrically connected to the input terminal of the control module via a PWM line, and outputs a PWM signal to the control module.

[0035] The positive terminal of the LED module is electrically connected to the output terminal of the power supply module, and the negative terminal of the LED module is electrically connected to the first connection terminal of the drive module.

[0036] A vehicle including the aforementioned light control system.

[0037] In the lamp control circuit, lamp control system, and vehicle provided in this application embodiment, the control module can control the LED module to turn on and off and adjust its brightness based on the drive signal and PWM signal output by the external controller, thereby achieving lighting animation effects. There is no need to set up a microcontroller unit in the lamp control circuit, making the control scheme simpler and saving manufacturing costs. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a circuit diagram of a lamp control system according to an embodiment of the present invention;

[0040] Figure 2 This is a circuit diagram of a lamp control circuit in one embodiment of this application.

[0041] In the diagram: 1. Power supply module; 11. Second filter circuit; 12. Reverse connection protection circuit; R11. Third resistor; R12. Fourth resistor; Q11. Reverse connection protection switch; D11. First Zener diode; C12. First capacitor; T11. Second diode; C11. Sixth capacitor;

[0042] 2. Control module; 21. First filter circuit; 22. Voltage regulator circuit; Q21. First switching transistor; Q22. Second switching transistor; R21. First resistor; R22. Second resistor; R23. Eighth resistor; R24. Ninth resistor; R25. Tenth resistor; C21. Third capacitor; C22. Fourth capacitor; D21. Second Zener diode; T21. First diode; C23. Fifth capacitor;

[0043] 3. Drive module; 31. Drive unit; Q31. Third switch transistor; Q32. Fourth switch transistor; R31. Fifth resistor; R32. Sixth resistor; R33. Seventh resistor; C31. Second capacitor; C32. Seventh capacitor;

[0044] 4. LED module; 41. LED unit;

[0045] 5. Controller. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] This application provides a lamp control circuit, such as... Figure 1 and Figure 2 As shown, the lamp control circuit includes a power supply module 1, a control module 2, a drive module 3, and an LED module 4. The input terminal of the power supply module 1 is used to electrically connect to the functional drive line and receive the drive signal transmitted by the functional drive line. The output terminal of the power supply module 1 is used to electrically connect to the positive terminal of the LED module 4. The first connection terminal of the control module 2 is electrically connected to the output terminal of the power supply module 1, and the second connection terminal of the control module 2 is grounded. The control terminal of the control module 2 is used to electrically connect to the PWM line and receive the PWM signal transmitted by the PWM line. When the drive signal is a high-level signal, it outputs a control signal based on the PWM signal. The first connection terminal of the drive module 3 is used to electrically connect to the negative terminal of the LED module 4, and the second connection terminal of the drive module 3 is grounded. The control terminal of the drive module 3 is electrically connected to the output terminal of the control module 2 and is used to control the LED module 4 based on the control signal.

[0048] As an example, the lamp control circuit includes a power supply module 1, a control module 2, a driver module 3, and an LED module 4. The input terminal of the power supply module 1 is electrically connected to the power supply terminal of the controller 5 to receive the drive signal output from the power supply terminal of the controller 5. The output terminal of the power supply module 1 is electrically connected to the positive terminal of the LED module 4 to supply power to the LED module 4. The negative terminal of the LED module 4 is electrically connected to the first connection terminal of the driver module 3, and the second connection terminal of the driver module 3 is grounded, forming a power supply loop between the power supply module 1, the LED module 4, the driver module 3, and ground. Whether this power supply loop is active is controlled by the control terminal of the driver module 3. The first connection terminal of the control module 2 is electrically connected to the output terminal of the power supply module 1, and the second connection terminal of the control module 2 is grounded. The control terminal of the control module 2 receives the PWM signal output from the controller 5. When the drive signal is a high-level signal, it can output a control signal to the driver module 3 based on the PWM signal; when the drive signal is a low-level signal, the control module 2 has no signal output. The control terminal of the driver module 3 is electrically connected to the output terminal of the control module 2 and can control the LED module 4 based on the control signal output by the control module 2. In other words, when the drive signal is high, the drive module 3 can control the power supply circuit to conduct based on the control signal output by the control module 2, thereby controlling the LED module 4; when the drive signal is low, since the control module 2 has no signal output, the drive module 3 does not receive the control signal, causing the power supply circuit to not conduct and not drive the LED module 4 to work. In this example, when the lamp control circuit is applied to a vehicle, the functional drive line used to connect the controller 5 and the power supply module 1 is the tail line (i.e., the decorative line at the rear of the car, i.e., the taillight line), and the drive signal transmitted therein can be... Figure 2 The TAIL signal in the middle.

[0049] Specifically, when the driving signal is a high-level signal, the control signal output by the control module 2 corresponds to the PWM signal. For example, the control signal can be based on the high level in the PWM signal to output a high-level signal, turning on the driving module 3, forming a power supply loop between the power supply module 1, LED module 4, driving module 3, and ground, and causing the LED module 4 to work and emit light. Conversely, the control signal can be based on the low level in the PWM signal to output a low-level signal, turning off the driving module 3, forming a power supply loop between the power supply module 1, LED module 4, driving module 3, and ground, and causing the LED module 4 to stop working. The PWM signal is a series of continuous high and low level signals. The duty cycle in the PWM signal represents the proportion of the high level output duration within one cycle. Therefore, when the duty cycle of the PWM signal increases, the working time of the LED module 4 can be extended, resulting in a brightness increase light control effect during the display process. Thus, by changing the duty cycle of the PWM signal, the brightness increase or decrease light control effect can be achieved in the LED module 4. Furthermore, by modulating the duty cycle variation of the PWM signal, specific lighting effects such as flashing or breathing lights can be created. When the drive signal is a low-level signal, the control module 2 has no signal output, and the drive module 3 does not receive a control signal, causing the aforementioned power supply circuit to be unconducted and preventing the LED module 4 from operating.

[0050] In this example, the control module 2 can control the LED module 4 to turn on and off and adjust its brightness based on the drive signal and PWM signal output by the external controller 5, thereby achieving a lighting animation effect. There is no need to set up a microcontroller unit in the lamp control circuit, making the control scheme simpler and saving manufacturing costs.

[0051] In one embodiment, the control module 2 includes a first switch Q21, a second switch Q22, a first resistor R21, and a second resistor R22. The first connection terminal of the second switch Q22 is electrically connected to the output terminal of the power supply module 1 through the second resistor R22, and the second connection terminal of the second switch Q22 is grounded. The control terminal of the second switch Q22 is electrically connected to the PWM line to receive the PWM signal transmitted by the PWM line. When the drive signal is a high-level signal, it turns on or off based on the PWM signal. The first connection terminal of the first switch Q21 is electrically connected to the output terminal of the power supply module 1 through the first resistor R21, and the second connection terminal of the first switch Q21 is grounded. The control terminal of the first switch Q21 is electrically connected to the connection node between the second switch Q22 and the first resistor R21. It is used to turn off when the second switch Q22 is turned on and turn on when the second switch Q22 is turned off, outputting a control signal. The connection node between the first connection terminal of the first switch Q21 and the first resistor R21 is electrically connected to the control terminal of the drive module 3.

[0052] As an example, control module 2 includes a first switch Q21, a second switch Q22, a first resistor R21, and a second resistor R22. The first switch Q21 and the second switch Q22 can be, but are not limited to, MOSFETs, transistors, matrix chips, or other switching devices. In this example, the first switch Q21 and the second switch Q22 can be NPN transistors. The first connection terminal of the first switch Q21 and the second switch Q22 is the collector of the transistor, the second connection terminal of the first switch Q21 and the second switch Q22 is the emitter of the transistor, and the control terminal of the first switch Q21 and the second switch Q22 is the base of the transistor. The two ends of the first resistor R21 are electrically connected to the output terminal of power supply module 1 and the first connection terminal of the first switch Q21, respectively, to limit the current flowing through the first switch Q21, so as to prevent overcurrent damage to the first switch Q21 during the moment of turn-on. The two ends of the second resistor R21 are electrically connected to the output terminal of the power supply module 1 and the first connection terminal of the second switch Q22, respectively. This resistor limits the current flowing through the second switch Q22 to prevent overcurrent damage during the moment the second switch Q22 is closed. In this example, the connection point between the first connection terminal of the first switch Q21 and the first resistor R21 is the output terminal of the control module 2, which is electrically connected to the control terminal of the drive module 3.

[0053] In this example, when the drive signal is high, if the PWM signal is also high, the second switch Q22 is turned on, the control terminal of the first switch Q21 is pulled down to ground, and the first switch Q21 is turned off. At this time, the power supply module 1 is grounded through the second resistor R22 and is also electrically connected to the drive module 3 through the first resistor R21. The voltage across the second resistor R22, the voltage across the first resistor R21, and the voltage at the control terminal of the drive module 3 are equal, so the drive module 3 is turned on, and the LED module 4 works. If the PWM signal is low, the second switch Q22 is turned off, the current output by the power supply module 1 flows through the second resistor R22 to the control terminal of the first switch Q21, and the current output by the power supply module 1 flows through the first resistor R21 to the first connection terminal of the first switch Q21. The first switch Q21 is turned on to ground, and the power supply module 1 is grounded through the first resistor R21 and the first switch Q21. The drive module 3 is turned off because it cannot obtain voltage, and the LED module 4 does not work.

[0054] As an example, control module 2 also includes an eighth resistor R23, a ninth resistor R24, a tenth resistor R25, a third capacitor C21, and a fourth capacitor C22. The first terminal of the eighth resistor R23 is electrically connected to the control terminal of the first switching transistor Q21, and the second terminal of the eighth resistor R23 is grounded. The first terminal of the third capacitor C21 is also electrically connected to the control terminal of the first switching transistor Q21, and the second terminal of the third capacitor C21 is grounded. The eighth resistor R23 and the third capacitor C21 act as filters for the first switching transistor Q21. The first terminal of the ninth resistor R24 ​​is electrically connected to the control terminal of the second switching transistor Q22, and the second terminal of the ninth resistor R24 ​​is grounded. The first terminal of the fourth capacitor C22 is also electrically connected to the control terminal of the second switching transistor Q22, and the second terminal of the fourth capacitor C22 is grounded. The ninth resistor R24 ​​and the fourth capacitor C22 act as filters for the second switching transistor Q22. The first terminal of the tenth resistor R25 is used to receive PWM signals, and the second terminal of the tenth resistor R25 is electrically connected to the control terminal of the second switching transistor Q22, thus limiting the current of the second switching transistor Q22.

[0055] In one embodiment, the control module 2 further includes a first filter circuit 21 and a voltage regulator circuit 22; the first terminal of the voltage regulator circuit 22 is electrically connected to the PWM line, and the second terminal of the voltage regulator circuit 22 is electrically connected to the control terminal of the second switching transistor Q22; the first terminal of the first filter circuit 21 is electrically connected to the PWM line and the first terminal of the voltage regulator circuit 22, and the second terminal of the first filter circuit 21 is grounded.

[0056] As an example, the control module 2 also includes a first filter circuit 21 and a voltage regulator circuit 22. The first terminal of the voltage regulator circuit 22 is electrically connected to the controller 5 via a PWM line to receive the PWM signal output by the controller 5. The second terminal of the voltage regulator circuit 22 is electrically connected to the control terminal of the second switching transistor Q22. The voltage regulator circuit 22 may include a second Zener diode D21. The cathode of the second Zener diode D21 is electrically connected to the PWM line, and the anode of the second Zener diode D21 is electrically connected to the control terminal of the second switching transistor Q22, thus providing voltage regulation. The first terminal of the first filter circuit 21 is electrically connected to both the PWM line and the first terminal of the voltage regulator circuit 22. The second terminal of the first filter circuit 21 is grounded and used to filter the input PWM signal.

[0057] As an example, the first filter circuit 21 includes a first diode T21 and a fifth capacitor C23 connected in parallel. The anode of the first diode T21 is electrically connected to the PWM line and the first terminal of the voltage regulator circuit 22, and the cathode of the first diode T21 is grounded. The first terminal of the fifth capacitor C23 is electrically connected to the PWM line and the voltage regulator circuit 22, and the second terminal of the fifth capacitor C23 is grounded. The first diode T21 and the fifth capacitor C23 work together to achieve a filtering effect. In this example, since the PWM signal power transmitted by the PWM line is relatively small, a lower-power first filter circuit 21 can be used. Therefore, the number of fifth capacitors C23 can be set to one. In this example, the first diode T21 can be, but is not limited to, a transient suppression diode.

[0058] In one embodiment, the power supply module 1 includes a second filter circuit 11 and a reverse connection protection circuit 12; the first end of the reverse connection protection circuit 12 is electrically connected to the functional drive line, and the second end of the reverse connection protection circuit 12 is electrically connected to the positive terminal of the LED module 4 and the first connection terminal of the control module 2; the first end of the second filter circuit 11 is electrically connected to the functional drive line and the first end of the reverse connection protection circuit 12, and the second end of the second filter circuit 11 is grounded.

[0059] As an example, the power supply module 1 includes a second filter circuit 11 and a reverse connection protection circuit 12. The first terminal of the reverse connection protection circuit 12 is electrically connected to the functional drive line to receive the drive signal transmitted by the functional drive line. The second terminal of the reverse connection protection circuit 12 is electrically connected to the positive terminal of the LED module 4 and the first connection terminal of the control module 2. When the drive signal is a high-level signal, the reverse connection protection circuit 12 is turned on, enabling the output terminal of the power supply module 1 to provide a power supply voltage; when the drive signal is a low-level signal, the reverse connection protection circuit 12 is turned off, preventing the output terminal of the power supply module 1 from providing a power supply voltage. The first terminal of the second filter circuit 11 is electrically connected to both the functional drive line and the first terminal of the reverse connection protection circuit 12, and is used to filter the input drive signal.

[0060] In one embodiment, the second filter circuit 11 includes a second diode T11 and a sixth capacitor C11 connected in parallel. Specifically, the anode of the second diode T11 is connected to the first terminal of the functional drive line and the reverse connection protection circuit 12, while the cathode of the second diode T11 is grounded. The first terminal of the sixth capacitor C11 is connected to the first terminal of the functional drive line and the reverse connection protection circuit 12, while the second terminal of the sixth capacitor C11 is grounded. The second diode T11 and the sixth capacitor C11 work together to achieve a filtering effect. Since the drive signal transmitted by the functional drive line has a relatively high power, a second filter circuit 11 with a high power is required. Therefore, the number of sixth capacitors C11 can be two or more, depending on actual needs. In this example, the second diode T11 can be, but is not limited to, a transient suppression diode.

[0061] In one embodiment, the reverse connection protection circuit 12 includes a third resistor R11, a fourth resistor R12, a reverse connection protection switch Q11, a first Zener diode D11, and a first capacitor C12; the first end of the third resistor R11 is electrically connected to the power supply terminal VCC, and the second end of the third resistor R11 is grounded through the fourth resistor R12; the first connection end of the reverse connection protection switch Q11 is electrically connected to the functional drive line, the second connection end of the reverse connection protection switch Q11 is electrically connected to the power supply terminal VCC, and the control terminal of the reverse connection protection switch Q11 is connected to the third resistor R11. The connection point between the first Zener diode D11 and the fourth resistor R12 is electrically connected; the anode of the first Zener diode D11 is electrically connected to the control terminal of the reverse connection protection switch Q11, and the cathode of the first Zener diode D11 is electrically connected to the second connection terminal of the reverse connection protection switch Q11; the first terminal of the first capacitor C12 is electrically connected to the control terminal of the reverse connection protection switch Q11, and the second terminal of the first capacitor C12 is electrically connected to the second connection terminal of the reverse connection protection switch Q11; the second connection terminal of the reverse connection protection switch Q11 is also electrically connected to the positive terminal of the LED module 4 and the first connection terminal of the control module 2.

[0062] As an example, the first end of the third resistor R11 is used to connect to the power supply terminal VCC, and the second end of the third resistor R11 is grounded through the fourth resistor R12. That is, the third resistor R11 and the fourth resistor R12 are connected in series between the power supply terminal VCC and ground to divide the voltage of the power supply terminal VCC so as to provide the turn-on voltage for the reverse connection protection switch Q11.

[0063] The first terminal of the reverse polarity protection switch Q11 is used to electrically connect to the functional drive line, the second terminal of the reverse polarity protection switch Q11 is used to connect to the power supply terminal, and the control terminal of the reverse polarity protection switch Q11 is electrically connected to the connection node between the third resistor R11 and the fourth resistor R12 to receive the turn-on voltage. For example, when the reverse polarity protection switch Q11 is a PMOS transistor, the first terminal of the reverse polarity protection switch Q11 is the drain of the PMOS transistor, the second terminal of the reverse polarity protection switch Q11 is the source of the PMOS transistor, and the control terminal of the reverse polarity protection switch Q11 is the gate of the PMOS transistor. When the drive signal output by controller 5 is a high-level signal, the gate of the PMOS transistor is low-side and the drain is high-side, the voltage between the gate and source of the PMOS transistor is negative, the PMOS transistor is turned on, and the drive signal can flow from the drain to the source of the PMOS transistor to power the LED module 4 and the control module 2. When the drive signal output by controller 5 is a low-level signal, the gate of the PMOS transistor is high-side and the drain is low-side, the voltage between the gate and source of the PMOS transistor is positive, the PMOS transistor is turned off, the drive signal cannot flow from the drain to the source of the PMOS transistor, and cannot power the LED module 4. Therefore, it can prevent the current direction of the power supply signal from being reversed, protecting the subsequent circuit. In this example, the second connection terminal of the reverse connection protection switch Q11 is also used to electrically connect to the positive terminal of the LED module 4 and the first connection terminal of the control module 2, that is, the second connection terminal of the reverse connection protection switch Q11 is the output terminal of the power supply module 1.

[0064] The anode of the first Zener diode D11 is electrically connected to the control terminal of the reverse connection protection switch Q11, and the cathode of the first Zener diode D11 is electrically connected to the second connection terminal of the reverse connection protection switch Q11. That is, the two ends of the first Zener diode D11 are electrically connected to the gate and source of the PMOS transistor respectively, so that the gate of the reverse connection protection switch Q11 is protected from excessive voltage and the voltage regulation effect is achieved.

[0065] The first end of the first capacitor C12 is electrically connected to the control terminal of the reverse connection protection switch Q11, and the second end of the first capacitor C12 is electrically connected to the second connection terminal of the reverse connection protection switch Q11. That is, the two ends of the first capacitor C12 are electrically connected to the gate and source of the PMOS transistor respectively, so as to bypass the noise of the gate to the source and realize the voltage regulation and filtering function.

[0066] In one embodiment, the LED module 4 includes at least one LED unit 41, the positive terminal of each LED unit 41 is electrically connected to the output terminal of the power supply module 1; the driving module 3 includes at least one driving unit 31; the first connection terminal of each driving unit 31 is used to be electrically connected to the negative terminal of an LED unit 41, the second connection terminal of each driving unit 31 is grounded, and the control terminal of each driving unit 31 is electrically connected to the output terminal of the control module 2 for control based on the control signal.

[0067] As an example, the LED module 4 includes at least one LED unit 41; the driving module 3 includes a third switch Q31 and at least one driving unit 31; the positive terminal of each LED unit 41 is electrically connected to the output terminal of the power supply module 1; the first connection terminal of each driving unit 31 is electrically connected to the negative terminal of the LED unit 41, the second connection terminal of each driving unit 31 is grounded, and the control terminal of each driving unit 31 is electrically connected to the output terminal of the control module 2, so that a power supply branch is formed between the power supply module 1, an LED unit 41, and a driving unit 31, and the driving unit 31 controls the corresponding LED unit 41 to work or not work. When the driving signal is a high-level signal, the control module 2 outputs a control signal to each driving unit 31, causing the driving unit 31 to work or not work under the control of the control signal. Specifically, when the driving signal is high, each driving unit 31 can control the power supply branch it belongs to to conduct based on the control signal output by the control module 2, and control the LED unit 41 in its power supply branch. When the driving signal is low, since the control module 2 has no signal output, the driving unit 31 does not receive the control signal, so the power supply branch is not conducted, and the LED unit 41 in its power supply branch is not driven to work. In this example, each LED unit 41 may include one LED branch or at least two LED branches connected in parallel. Each LED branch may include one LED bead, or at least two LED beads connected in series / parallel. When its power supply branch is conducted, all LED beads in that power supply branch are lit, and vice versa.

[0068] In one embodiment, the drive module 3 further includes a third switch Q31; the first connection terminal of the third switch Q31 is electrically connected to the output terminal of the control module 2, the second connection terminal of the third switch Q31 is grounded, and the control terminal of the third switch Q31 is electrically connected to at least one drive unit 31 for overcurrent protection of at least one drive unit 31.

[0069] As an example, the first connection terminal of the third switch Q31 is connected to the output terminal of the control module 2, the second connection terminal of the third switch Q31 is grounded, and at least one drive unit 31 is electrically connected, so that the third switch Q31 can determine whether the third switch Q31 is turned on or off based on the current output by at least one drive unit 31, so as to determine whether it is necessary to conduct the current of the output terminal of the control module 2 to ground, thereby realizing overcurrent protection for at least one drive unit 31.

[0070] In this example, when the drive signal is high, if the PWM signal is also high, the second switch Q22 is turned on and the first switch Q21 is turned off. The control terminal of at least one drive unit 31 receives the turn-on voltage, causing the power supply branch of at least one drive unit 31 to be turned on. At least one drive unit 31 can output current to the control terminal of the third switch Q31. The two connection terminals of the third switch Q31 are respectively connected to the output terminal of the control module 2 and ground. The control terminal of the third switch Q31 is electrically connected to the output terminal of at least one drive unit 31. When the current output by at least one drive unit 31 is large, causing the voltage at the control terminal of the third switch Q31 to reach the turn-on voltage of the third switch Q31, the third switch Q31 is turned on to transfer the current from the output terminal of the control module 2 to ground, preventing it from continuing to provide the turn-on voltage to at least one drive unit 31, thus turning off at least one drive unit 31 and achieving overcurrent protection for at least one drive unit 31.

[0071] In one embodiment, each driving unit 31 includes a fourth switch Q32, a fifth resistor R31, a sixth resistor R32, a seventh resistor R33, and a second capacitor C31; the first connection terminal of the fourth switch Q31 is used to be electrically connected to the negative terminal of an LED unit 41; the second connection terminal of the fourth switch Q31 is grounded through the fifth resistor R31, and the second connection terminal of the fourth switch Q31 is also electrically connected to the control terminal of the third switch Q31 through the sixth resistor R32; the control terminal of the fourth switch Q32 is electrically connected to the output terminal of the control module 2 through the seventh resistor R33, and the control terminal of the fourth switch Q32 is also grounded through the second capacitor C31.

[0072] As an example, each driving unit 31 includes a fourth switching transistor Q32, which can be, but is not limited to, a MOSFET, a transistor, a matrix chip, or other switching devices. In this example, the fourth switching transistor Q32 can be an NPN transistor. The first connection terminal of the fourth switching transistor Q32 is the collector of the transistor, the second connection terminal is the emitter of the transistor, and the control terminal of the fourth switching transistor Q32 is the base of the transistor. The first connection terminal of the fourth switching transistor Q32 is electrically connected to the negative terminal of an LED unit 41, and the second connection terminal of the fourth switching transistor Q32 is grounded through a fifth resistor R31. The fifth resistor R31 limits the current flowing through the power supply branch of the fourth switching transistor Q32 to regulate the current magnitude. The second connection terminal of the fourth switching transistor Q31 is also electrically connected to the control terminal of a third switching transistor Q31 through a sixth resistor R32 to provide overcurrent protection for the third switching transistor Q31 and prevent damage to the third switching transistor Q31 due to excessive current. The control terminal of the fourth switch Q32 is electrically connected to the output terminal of the control module 2 through the seventh resistor R33. This resistor R33 provides overcurrent protection for the fourth switch Q32, preventing damage from excessive current. The control terminal of the fourth switch Q32 is also grounded through the second capacitor C31. Specifically, the two ends of the second capacitor C32 are connected to both the control terminal of its corresponding fourth switch Q32 and ground, respectively, for filtering the fourth switch Q32.

[0073] In this example, when the drive signal is high, if the PWM signal is also high, the second switch Q22 is turned on, the first switch Q21 is turned off, and the control terminal of the fourth switch Q32 in the drive unit 31 can obtain the turn-on voltage. The fourth switch Q32 is turned on, and the power supply branch of each drive unit 31 is turned on. When the current output from the second terminal of the fourth switch Q32 is too large, causing the voltage at the control terminal of the third switch Q31 to reach the turn-on voltage of the third switch Q31, the third switch Q31 is turned on to ground the current at the output terminal of the control module 2, preventing the at least one fourth switch Q32 from being provided with the turn-on voltage. This causes at least one fourth switch Q32 to be turned off, the current output from the second connection terminal of the fourth switch Q32 disappears, and the third switch Q31 returns to the off state. Therefore, the phenomenon of excessive current in the fourth switch Q32 can be prevented.

[0074] As an example, the drive module 3 also includes a seventh capacitor C31, the two ends of which are connected to the control terminal of the third switch Q31 and ground, respectively, and can filter the third switch Q31.

[0075] This application also provides a lamp control system, such as... Figure 1As shown, the lighting control system includes a controller 5, an LED module 4, and the aforementioned lighting control circuit. The controller 5 is electrically connected to the input terminal of the power supply module 1 via a functional drive line, and outputs a drive signal to the power supply module 1. The controller 5 is electrically connected to the input terminal of the control module 2 via a PWM line, and outputs a PWM signal to the control module 2. The positive terminal of the LED module 4 is electrically connected to the output terminal of the power supply module 1, and the negative terminal of the LED module 4 is electrically connected to the first connection terminal of the drive module 3.

[0076] As an example, controller 5 can be, but is not limited to, a body control module (BCM) or a domain controller. The controller is electrically connected to the input of power supply module 1 via a function drive line and to the input of control module 2 via a PWM line. The positive terminal of LED module 4 is electrically connected to the output of power supply module 1, and the negative terminal of LED module 4 is electrically connected to the first connection terminal of drive module 3. Controller 5 can achieve different lighting control effects by outputting different drive signals and PWM signals. For example, when only the lighting function needs to be triggered, the controller outputs a high-level drive signal with a 100% duty cycle. When the animation function needs to be triggered, the controller outputs a high-level drive signal with a PWM duty cycle less than 100%, adjusting the brightness of LED module 4 according to different animation effects to achieve lighting control effects. When the LED module 4 does not need to be controlled, the controller outputs a low-level drive signal, causing drive module 3 to not operate. In this example, the control module 2 can control the LED module 4 to turn on and off and adjust its brightness based on the drive signal and PWM signal, thereby achieving a light animation effect. There is no need to set up a microcontroller unit in the lamp control circuit, making the control scheme simpler and saving manufacturing costs.

[0077] This application provides a vehicle including the lighting control system described in the above embodiments.

[0078] As an example, the vehicle includes a controller 5 and a lighting control circuit as described in any of the above examples. The controller 5 can be a body control module (BCM), electrically connected to the lighting control circuit. When the vehicle requires lighting control, it outputs a high-level drive signal to the power supply module 1 and, based on the specific lighting control requirement, outputs a corresponding PWM signal to the control module 2. This allows the drive module 3 to control the LED module 4 under the control of the control module 2, enabling the LED module 4 to achieve specific lighting effects. When the vehicle does not require lighting control, the controller 5 outputs a low-level drive signal to the power supply module 1, so that the LED module 4 does not operate. The control module 2 in the vehicle's lighting control circuit can control the on / off state and adjust the brightness of the LED module 4 based on the drive signal and the PWM signal, thereby achieving lighting animation effects. This eliminates the need for a microcontroller unit in the lighting control circuit, simplifying the control scheme and saving manufacturing costs.

[0079] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A lamp control circuit, characterized in that, Includes a power supply module, a control module, and a drive module; The input terminal of the power supply module is used to electrically connect to the functional drive line and receive the drive signal transmitted by the functional drive line. The output terminal of the power supply module is used to electrically connect to the positive terminal of the LED module. The first connection terminal of the control module is electrically connected to the output terminal of the power supply module, the second connection terminal of the control module is grounded, and the control terminal of the control module is used to be electrically connected to the PWM line to receive the PWM signal transmitted by the PWM line. When the drive signal is a high-level signal, the control signal is output based on the PWM signal. The first connection terminal of the driving module is electrically connected to the negative terminal of the LED module, the second connection terminal of the driving module is grounded, and the control terminal of the driving module is electrically connected to the output terminal of the control module for controlling the LED module based on the control signal.

2. The lamp control circuit according to claim 1, characterized in that, The control module includes a first switching transistor, a second switching transistor, a first resistor, and a second resistor; The first connection terminal of the second switching transistor is electrically connected to the output terminal of the power supply module through the second resistor. The second connection terminal of the second switching transistor is grounded. The control terminal of the second switching transistor is used to be electrically connected to the PWM line to receive the PWM signal transmitted by the PWM line. When the drive signal is a high-level signal, the transistor is turned on or off based on the PWM signal. The first connection terminal of the first switch is electrically connected to the output terminal of the power supply module through the first resistor. The second connection terminal of the first switch is grounded. The control terminal of the first switch is electrically connected to the connection node between the second switch and the first resistor. It is used to turn off when the second switch is turned on and turn on when the second switch is turned off, and output a control signal. The connection point between the first connection terminal of the first switching transistor and the first resistor is electrically connected to the control terminal of the drive module.

3. The lamp control circuit according to claim 2, characterized in that, The control module also includes a first filter circuit and a voltage regulator circuit; The first terminal of the voltage regulator circuit is electrically connected to the PWM line, and the second terminal of the voltage regulator circuit is electrically connected to the control terminal of the second switching transistor. The first terminal of the first filter circuit is electrically connected to the PWM line and the first terminal of the voltage regulator circuit, and the second terminal of the first filter circuit is grounded.

4. The lamp control circuit according to claim 1, characterized in that, The power supply module includes a second filter circuit and a reverse connection protection circuit; The first end of the reverse connection protection circuit is used to be electrically connected to the functional drive line, and the second end of the reverse connection protection circuit is electrically connected to the positive terminal of the LED module and the first connection terminal of the control module. The first terminal of the second filter circuit is electrically connected to the first terminal of the functional drive line and the reverse connection protection circuit, and the second terminal of the second filter circuit is grounded.

5. The lamp control circuit according to claim 4, characterized in that, The reverse connection protection circuit includes a third resistor, a fourth resistor, a reverse connection protection switching transistor, a first Zener diode, and a first capacitor. The first end of the third resistor is used to be electrically connected to the power supply end, and the second end of the third resistor is grounded through the fourth resistor; The first connection terminal of the reverse connection protection switch tube is used to electrically connect to the functional drive line, the second connection terminal of the reverse connection protection switch tube is used to electrically connect to the power supply terminal, and the control terminal of the reverse connection protection switch tube is electrically connected to the connection node between the third resistor and the fourth resistor. The anode of the first Zener diode is electrically connected to the control terminal of the reverse connection protection switch, and the cathode of the first Zener diode is electrically connected to the second connection terminal of the reverse connection protection switch. The first terminal of the first capacitor is electrically connected to the control terminal of the reverse connection protection switch, and the second terminal of the first capacitor is electrically connected to the second connection terminal of the reverse connection protection switch. The second connection terminal of the reverse connection protection switch tube is also electrically connected to the positive terminal of the LED module and the first connection terminal of the control module.

6. The lamp control circuit according to claim 1, characterized in that, The LED module includes at least one LED unit, and the positive terminal of each LED unit is electrically connected to the output terminal of the power supply module. The driving module includes at least one driving unit; The first connection terminal of each driving unit is electrically connected to the negative electrode of an LED unit, the second connection terminal of each driving unit is grounded, and the control terminal of each driving unit is electrically connected to the output terminal of the control module for control based on the control signal.

7. The lamp control circuit according to claim 6, characterized in that, The drive module also includes a third switching transistor; The first connection terminal of the third switch is electrically connected to the output terminal of the control module, the second connection terminal of the third switch is grounded, and the control terminal of the third switch is electrically connected to at least one of the drive units for overcurrent protection of at least one of the drive units.

8. The lamp control circuit according to claim 7, characterized in that, Each of the aforementioned drive units includes a fourth switch, a fifth resistor, a sixth resistor, a seventh resistor, and a second capacitor; The first connection terminal of the fourth switch is used to be electrically connected to the negative terminal of one of the LED units; The second connection terminal of the fourth switch is grounded through the fifth resistor, and the second connection terminal of the fourth switch is also electrically connected to the control terminal of the third switch through the sixth resistor; The control terminal of the fourth switch is electrically connected to the output terminal of the control module through the seventh resistor, and the control terminal of the fourth switch is also grounded through the second capacitor.

9. A lighting control system, characterized in that, Includes a controller, an LED module, and the lamp control circuit according to any one of claims 1-8; The controller is electrically connected to the input terminal of the power supply module via a functional drive line, and outputs a drive signal to the power supply module; the controller is electrically connected to the input terminal of the control module via a PWM line, and outputs a PWM signal to the control module. The positive terminal of the LED module is electrically connected to the output terminal of the power supply module, and the negative terminal of the LED module is electrically connected to the first connection terminal of the drive module.

10. A vehicle, characterized in that, Includes the lamp control system described in claim 9.

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