Multiplexed driving circuit and driving method of vehicle daytime running, position and turn signal lights

Abstract

The present invention relates to the technical field of automotive LED drive circuits, and in particular to a multiplexed drive circuit for automotive daytime running lights, position lights, and turn lights, comprising a switching power supply module, a controller module, and a control module, wherein the switching power supply module is used to provide a drive current for the multiplexed drive circuit, the controller module is used to collect input signals, and generate corresponding control signals to control the control module, and the control module is used to control the lighting or extinguishing of the turn lights or the position / daytime running lights according to the output of the controller module, and to adjust the brightness of the turn lights or the position / daytime running lights. The present invention has a simple structure, realizes the driving of the position, daytime running lights, and turn lights through one-way driving, has a simple control logic, a compact structure, and greatly reduces the cost.

Description

Technical Field

[0001] The present invention relates to the technical field of LED driving circuits for automobiles, and in particular to a multiplexed driving circuit for daytime running lights, position lights and turn lights for automobiles and a driving method thereof. Background Art

[0002] With the use and development of LED, the shape of automobile lamps is becoming more and more modern, and the space is becoming more and more compact. Therefore, daytime running lights, position lights and turn signals are increasingly realized by light guides. These lights with several functions often reuse the same light guide to reduce space. At present, for this kind of multifunctional multiplexed lamp, its LED driver generally uses a constant current drive circuit for each function to achieve the drive, such as one drive circuit for daytime running and position, and one drive circuit for turn, which is costly. Since the daytime running, position and turn functions reuse one light guide, when the light of one function is on, the lights of other functions need to be extinguished. Therefore, when each function uses a separate drive circuit, it is also necessary to match the logic between the drives. Not only is the design and manufacturing complex, but it also occupies a large space and is costly. Summary of the invention

[0003] The present invention relates to a multiplexed driving circuit for daytime running lights, position lights and turn lights for a vehicle and a driving method thereof. Only one set of driving circuits is needed to realize the driving of the position lights, daytime running lights and turn lights, which is not only compact in structure but also lower in cost.

[0004] In order to achieve the purpose of the present invention, the technical solution adopted is: a multiplexed driving circuit for vehicle daytime running lights, position lights and turn lights, including a switching power supply module, a controller module and a control module, the switching power supply module is used to provide a driving current for the multiplexed driving circuit, the controller module is used to collect input signals and generate corresponding control signals to control the control module, and the control module is used to control the lighting or extinguishing of the turn signal T_LED or the position / daytime running light D / P_LED according to the output of the controller module, and adjust the brightness of the turn signal T_LED or the position / daytime running light D / P_LED.

[0005] As an optimization scheme of the present invention, the switching power supply module includes an inductor L1, a capacitor C1, a switching power supply topology diode D4 and a switching power supply chip U1. The voltage input pins of the switching power supply chip U1 are respectively connected to the input power supply DRL of the daytime running light, the input power supply PL of the position light and the input power supply TL of the turn signal light. The conversion pin of the switching power supply chip U1 is connected to the cathode of the switching power supply topology diode D4. One end of the inductor L1 is connected to the cathode of the switching power supply topology diode D4. The other end of the inductor L1 is connected to the anode of the capacitor C1. The anode of the turn signal light T_LED and the anode of the position / daytime running light D / P_LED are both connected to the anode of the capacitor C1.

[0006] As an optimization scheme of the present invention, the controller module includes a power management chip U2 and a microprocessor chip U3. The power input end of the power management chip U2 is respectively connected to the input power DRL of the daytime running light, the input power PL of the position light and the input power TL of the turn light. The voltage output end of the power management chip U2 is connected to the power end of the microprocessor chip U3. The input power DRL of the daytime running light is connected to the IO pin RA0 of the microprocessor chip U3, the input power PL of the position light is connected to the IO pin RA1 of the microprocessor chip U3, and the input power TL of the turn light is connected to the IO pin RA2 of the microprocessor chip U3.

[0007] As an optimization scheme of the present invention, the control module includes a fifth anti-reverse connection diode D5, a sixth anti-reverse connection diode D6, a seventh anti-reverse connection diode D7, a MOS tube Q1, a MOS tube Q2, a MOS tube Q3, a seventh current sampling resistor R7, an eighth current sampling resistor R8 and a ninth current sampling resistor R9, the positive electrode of the fifth anti-reverse connection diode D5, the positive electrode of the sixth anti-reverse connection diode D6 and the positive electrode of the seventh anti-reverse connection diode D7 are all connected to the feedback pin of the switching power supply chip U1, the gate of the MOS tube Q1 is connected to the IO pin RA7 of the microprocessor chip U3, the drain of the MOS tube Q1 is connected to the negative electrode of the turn signal lamp T_LED, the source of the MOS tube Q1 is connected to the negative electrode of the fifth anti-reverse connection diode D5, the gate of the MOS tube Q2 is connected to the IO pin RA6 of the microprocessor chip U3, and the MOS tube The drain of Q2 is connected to the cathode of the position / daytime running light D / P_LED, the source of the MOS tube Q2 is connected to the cathode of the sixth anti-reverse connection diode D6, the gate of the MOS tube Q3 is connected to the IO pin RA5 of the microprocessor chip U3, the drain of the MOS tube Q3 is connected to the cathode of the position / daytime running light D / P_LED, the source of the MOS tube Q3 is connected to the cathode of the seventh anti-reverse connection diode D7, one end of the seventh current sampling resistor R7 is connected to the cathode of the fifth anti-reverse connection diode D5, and the other end of the seventh current sampling resistor R7 is grounded, one end of the eighth current sampling resistor R8 is connected to the cathode of the sixth anti-reverse connection diode D6, and the other end of the eighth current sampling resistor R8 is grounded, one end of the ninth current sampling resistor R9 is connected to the cathode of the seventh anti-reverse connection diode D7, and the other end of the ninth current sampling resistor R9 is grounded.

[0008] In order to achieve the purpose of the present invention, a driving method of a multiplexed driving circuit for a vehicle daytime running light, a position light, and a turn signal light is adopted, comprising the following steps:

[0009] (1) After power-on, the controller module detects the daytime running, position, and turn signal signals;

[0010] (2) When the controller module detects the turn signal, the controller module controls the control module to light up the turn signal T_LED and turn off the position / daytime running light D / P_LED;

[0011] (3) When the controller module detects the position light signal, the controller module controls the control module to make the position / daytime running light D / P_LED dimly lit;

[0012] (4) When the controller module detects the daytime running light signal, the controller module controls the control module to make the position / daytime running light D / P_LED high.

[0013] The present invention has positive effects: the present invention has a simple structure, realizes the driving of the position, daytime running and turn lights through one-way driving, has simple control logic, compact structure, and greatly reduces the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0015] Figure 1 The circuit schematic diagram of the multiplexed driving circuit of the vehicle daytime running, position and turn signal lamps of the present invention;

[0016] Figure 2 The present invention is a flow chart of a driving method of a multiplexed driving circuit for a vehicle's daytime running, position, and turn signal lights. DETAILED DESCRIPTION

[0017] like Figure 1-2 As shown, the present invention discloses a multiplexed driving circuit for a vehicle daytime running light, position light, and turn light, including a switching power supply module, a controller module, and a control module. The switching power supply module is used to provide a driving current for the multiplexed driving circuit. The controller module is used to collect input signals and generate corresponding control signals to control the control module. The control module is used to control the lighting or extinguishing of the turn light T_LED or the position / daytime running light D / P_LED according to the output of the controller module, and adjust the brightness of the turn light T_LED or the position / daytime running light D / P_LED. Among them, the multiplexed driving circuit for a vehicle daytime running light, position light, and turn light has three input terminals, namely, the input power DRL of the daytime running light, the input power PL of the position light, and the input power TL of the turn light. T_LED is the LED of the turn light, and D / P_LED is the LED of the daytime running light and the position light. When the daytime running light input power DRL is supplied, D / P_LED is high-lighted, realizing the function of the daytime running light. When the position light input power PL is supplied, D / P_LED is dimly lit, realizing the function of the position light. When the turn signal input power TL is supplied, T_LED is on, realizing the function of the turn signal. When the turn signal is on, the daytime running light or the position light needs to be turned off.

[0018] The switching power supply module includes an inductor L1, a capacitor C1, a switching power supply topology diode D4 and a switching power supply chip U1. The voltage input pins of the switching power supply chip U1 are respectively connected to the input power supply DRL of the daytime running light, the input power supply PL of the position light and the input power supply TL of the turn signal light. The conversion pin of the switching power supply chip U1 is connected to the cathode of the switching power supply topology diode D4. One end of the inductor L1 is connected to the cathode of the switching power supply topology diode D4. The other end of the inductor L1 is connected to the anode of the capacitor C1. The anode of the turn signal light T_LED and the anode of the position / daytime running light D / P_LED are both connected to the anode of the capacitor C1. The switching power supply module provides current to the turn signal light LED and the position / daytime running light D / P_LED.

[0019] The controller module includes a power management chip U2 and a microprocessor chip U3. The power input end of the power management chip U2 is respectively connected to the input power DRL of the daytime running light, the input power PL of the position light, and the input power TL of the turn signal light. The voltage output end of the power management chip U2 is connected to the power end of the microprocessor chip U3. The input power DRL of the daytime running light is connected to the IO pin RA0 of the microprocessor chip U3, the input power PL of the position light is connected to the IO pin RA1 of the microprocessor chip U3, and the input power TL of the turn signal light is connected to the IO pin RA2 of the microprocessor chip U3. The power management chip U2 converts the input voltage into the working voltage of the microprocessor chip U3 to provide power to the microprocessor chip U3.

[0020] The control module includes a fifth anti-reverse connection diode D5, a sixth anti-reverse connection diode D6, a seventh anti-reverse connection diode D7, a MOS tube Q1, a MOS tube Q2, a MOS tube Q3, a seventh current sampling resistor R7, an eighth current sampling resistor R8 and a ninth current sampling resistor R9. The anode of the fifth anti-reverse connection diode D5, the anode of the sixth anti-reverse connection diode D6 and the anode of the seventh anti-reverse connection diode D7 are all connected to the feedback pin of the switching power supply chip U1, the gate of the MOS tube Q1 is connected to the IO pin RA7 of the microprocessor chip U3, the drain of the MOS tube Q1 is connected to the negative electrode of the turn signal lamp T_LED, the source of the MOS tube Q1 is connected to the negative electrode of the fifth anti-reverse connection diode D5, the gate of the MOS tube Q2 is connected to the IO pin RA6 of the microprocessor chip U3, the drain of the MOS tube Q2 is connected to the negative electrode of the turn signal lamp T_LED, the The cathode of the position / daytime running light D / P_LED is connected, the source of the MOS tube Q2 is connected to the cathode of the sixth anti-reverse connection diode D6, the gate of the MOS tube Q3 is connected to the IO pin RA5 of the microprocessor chip U3, the drain of the MOS tube Q3 is connected to the cathode of the position / daytime running light D / P_LED, the source of the MOS tube Q3 is connected to the cathode of the seventh anti-reverse connection diode D7, one end of the seventh current sampling resistor R7 is connected to the cathode of the fifth anti-reverse connection diode D5, the other end of the seventh current sampling resistor R7 is grounded, one end of the eighth current sampling resistor R8 is connected to the cathode of the sixth anti-reverse connection diode D6, the other end of the eighth current sampling resistor R8 is grounded, one end of the ninth current sampling resistor R9 is connected to the cathode of the seventh anti-reverse connection diode D7, and the other end of the ninth current sampling resistor R9 is grounded.

[0021] The first voltage sampling resistor R1 and the second voltage sampling resistor R2 divide the input power supply DRL of the daytime running light and transmit it to the RA0 pin of the microprocessor chip U3 as the daytime running light signal. Similarly, the third voltage sampling resistor R3 and the fourth voltage sampling resistor R4 divide the input power supply PL of the position light and transmit it to the RA1 pin of the microprocessor chip U3 as the position light signal. The fifth voltage sampling resistor R5 and the sixth voltage sampling resistor R6 divide the power supply of the turn signal light and transmit it to the RA2 pin of the microprocessor chip U3 as the turn signal light. When the microprocessor chip U3 detects these signals, according to the software logic, it will control the conduction or disconnection of the corresponding MOS tubes Q1, MOS tubes Q2, and MOS tubes Q3. When the turn signal light is detected, the MOS tube Q1 is turned on, and the MOS tubes Q2 and MOS tubes Q3 are disconnected. At this time, the turn signal T_LED is on, that is, only the turn signal light is on. When the position light signal is detected, the MOS tube Q2 is turned on, and the MOS tubes Q1 and MOS tubes Q3 are disconnected. At this time, a small current is used, and the position / daytime running light D / P_LED is slightly bright, that is, the position light function. When the DRL signal is detected, MOS tube Q1 is disconnected, MOS tube Q2 and MOS tube Q3 are turned on, and a large current is used at this time, and the position / DRL D / P_LED is bright, that is, the DRL function is realized.

[0022] A driving method using a multiplexed driving circuit for a vehicle's daytime running, position, and turn signal lamps comprises the following steps:

[0023] (1) After power-on, the controller module detects the daytime running, position, and turn signal signals;

[0024] (2) When the controller module detects the turn signal, the controller module controls the control module to light up the turn signal T_LED and turn off the position / daytime running light D / P_LED;

[0025] (3) When the controller module detects the position light signal, the controller module controls the control module to make the position / daytime running light D / P_LED dimly lit;

[0026] (4) When the controller module detects the daytime running light signal, the controller module controls the control module to make the position / daytime running light D / P_LED high.

[0027] like Figure 2 As shown, at the beginning of startup, the microprocessor chip U3 starts to detect the signals of the daytime running lights, position lights and turn lights. When the turn light signal is detected, the turn light T_LED is turned on, and the daytime running lights and position lights are turned off at the same time; if the turn light signal is not detected, the position light signal continues to be detected. When the position light signal is detected, the position / daytime running light D / P_LED is turned on, and a small current is used at this time. When the position light is not detected, the daytime running light signal continues to be detected. When the daytime running light signal is detected, the position / daytime running light D / P_LED is turned on, and a large current is used at this time. If the daytime running light signal is not detected, the program is re-executed.

[0028] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The multiplexed driving circuit of the vehicle's daytime running, position and turn signal lights is characterized by: It includes a switching power supply module, a controller module and a control module, wherein the switching power supply module is used to provide a driving current of a multiplexed driving circuit, the controller module is used to collect input signals and generate corresponding control signals to control the control module, and the control module is used to control the lighting or extinguishing of the turn signal lamp T_LED or the position / daytime running lamp D / P_LED according to the output of the controller module, and adjust the brightness of the turn signal lamp T_LED or the position / daytime running lamp D / P_LED; The switching power supply module includes an inductor L1, a capacitor C1, a switching power supply topology diode D4 and a switching power supply chip U1. The voltage input pin of the switching power supply chip U1 is respectively connected to the input power supply DRL of the daytime running light, the input power supply PL of the position light and the input power supply TL of the turn signal light. The conversion pin of the switching power supply chip U1 is connected to the cathode of the switching power supply topology diode D4. One end of the inductor L1 is connected to the cathode of the switching power supply topology diode D4. The other end of the inductor L1 is connected to the anode of the capacitor C1. The anode of the turn signal light T_LED and the anode of the position / daytime running light D / P_LED are both connected to the anode of the capacitor C1. The controller module includes a power management chip U2 and a microprocessor chip U3. The power input end of the power management chip U2 is respectively connected to the input power DRL of the daytime running light, the input power PL of the position light, and the input power TL of the turn signal light. The voltage output end of the power management chip U2 is connected to the power end of the microprocessor chip U3. The input power DRL of the daytime running light is connected to the IO pin RA0 of the microprocessor chip U3. The input power PL of the position light is connected to the IO pin RA1 of the microprocessor chip U3. The input power TL of the turn signal light is connected to the IO pin RA2 of the microprocessor chip U3. The control module includes a fifth anti-reverse connection diode D5, a sixth anti-reverse connection diode D6, a seventh anti-reverse connection diode D7, a MOS tube Q1, a MOS tube Q2, a MOS tube Q3, a seventh current sampling resistor R7, an eighth current sampling resistor R8 and a ninth current sampling resistor R9. The positive electrode of the fifth anti-reverse connection diode D5, the positive electrode of the sixth anti-reverse connection diode D6 and the positive electrode of the seventh anti-reverse connection diode D7 are all connected to the feedback pin of the switching power supply chip U1, the gate of the MOS tube Q1 is connected to the IO pin RA7 of the microprocessor chip U3, the drain of the MOS tube Q1 is connected to the negative electrode of the turn signal lamp T_LED, the source of the MOS tube Q1 is connected to the negative electrode of the fifth anti-reverse connection diode D5, the gate of the MOS tube Q2 is connected to the IO pin RA6 of the microprocessor chip U3, and the drain of the MOS tube Q2 is connected to the negative electrode of the turn signal lamp T_LED. The gate of the MOS tube Q3 is connected to the IO pin RA5 of the microprocessor chip U3, the drain of the MOS tube Q3 is connected to the cathode of the position / daytime running light D / P_LED, the source of the MOS tube Q3 is connected to the cathode of the seventh anti-reverse diode D7, one end of the seventh current sampling resistor R7 is connected to the cathode of the fifth anti-reverse diode D5, the other end of the seventh current sampling resistor R7 is grounded, one end of the eighth current sampling resistor R8 is connected to the cathode of the sixth anti-reverse diode D6, the other end of the eighth current sampling resistor R8 is grounded, one end of the ninth current sampling resistor R9 is connected to the cathode of the seventh anti-reverse diode D7, and the other end of the ninth current sampling resistor R9 is grounded; A driving method using a multiplexed driving circuit for a vehicle's daytime running, position, and turn signal lamps comprises the following steps: (1) After power-on, the controller module detects the daytime running, position, and turn signal signals; (2) When the controller module detects the turn signal, the controller module controls the control module to light up the turn signal T_LED and turn off the position / daytime running light D / P_LED; (3) When the controller module detects the position light signal, the controller module controls the control module to make the position / daytime running light D / P_LED dimly lit; (4) When the controller module detects the daytime running light signal, the controller module controls the control module to make the position / daytime running light D / P_LED high.

Images