Vehicle tail LOGO switch control system circuit

Abstract

The utility model discloses a vehicle tail LOGO switch control system circuit. The vehicle tail LOGO switch control system circuit comprises a first power supply input processing module, a first driving module, a first load module, a second power supply input processing module, a second driving module and a second load module, the input end of the first power supply input processing module is connected with the power supply end of a left power supply of a vehicle body, the output end of the first power supply input processing module is connected with the input end of the first driving module, and the output end of the first driving module is connected with the first load module; the input end of the second power input processing module is connected with the right power supply end of the vehicle body, the output end of the second power input processing module is connected with the input end of the second driving module, and the output end of the second driving module is connected with the second load module. The utility model provides a vehicle tail LOGO switch control system circuit which is lower in energy consumption, high in overall working efficiency, safer in circuit operation and good in heat dissipation and stability.

Description

Technical Field

[0001] The utility model relates to a vehicle tail LOGO switch control system circuit. Background Art

[0002] At present, with the increasing personalization of car design and brand culture, some high-end car brands have begun to use rear LOGO lights as part of car styling design to enhance the recognition of car brands and increase the uniqueness of vehicles. At the same time, as consumers' aesthetic requirements for car appearance and interior decoration increase, the appearance of rear LOGO lights has gradually become a symbol of fashion and trend.

[0003] In the existing car lighting technology, the rear LOGO light can display the brand of the car, work together with the rear lights of the vehicle to complete synchronous lighting, have a welcoming function, and achieve a variety of dynamic effects.

[0004] There are three main ways to power the rear LOGO light. One is to use the two controllers on the rear light to power the LOGO light separately. The second is to use the two single-side controllers on the rear light to power the entire LOGO light. The third is to use the BCM on the vehicle body to power the entire LOGO light directly. The latter two solutions require fewer connector pins than the first solution.

[0005] In the control method, it can be divided into two schemes, one is to use a linear scheme, and the other is to use a nonlinear scheme. The linear scheme uses a linear chip or MCU to achieve constant current or constant voltage output, which can realize the function of lighting up the lamp when it is powered on. If the linear chip has a PWM foot, the LOGO light supports PWM wave dimming to achieve a variety of dynamic effects. At the same time, the linear chip or MCU will have its own over-temperature or over-voltage protection function, which further improves the practicality of the circuit. The nonlinear solution can adopt a resistive solution or a switching power supply solution; the switching power supply solution has a higher circuit efficiency, and about 80% of the efficiency can be used to realize the function of the light-emitting diode, but the cost is very high, and this solution is difficult to rectify in the EMC experiment. In the prior art, there are the following defects:

[0006] 1. The rear LOGO light is not only used to display the car brand in the tail lamp, but also serves as a position light together with the first and second tail lamps. In addition, the size and space are relatively limited. In order to ensure a good optical effect, super red LEDs are generally used. Such LEDs require high power, so the overall power of the lamp is relatively high. The BCM threshold current at the body end and the surge current at the lamp end cannot be well matched. In addition, due to the risk of high power, the electronic solution will use a more expensive DC-DC switching power supply to reduce the overall power consumption of the solution.

[0007] 2. The linear solution uses a linear chip or MCU to achieve constant current or constant voltage output, which can realize the function of lighting the lamp when it is powered on. The linear chip has a PWM foot, so the LOGO light supports PWM wave dimming to achieve a variety of dynamic effects. At the same time, the linear chip or MCU will have its own over-temperature or over-voltage protection function, which further improves the practicality of the circuit.

[0008] 3. Nonlinear solutions can use a resistive solution or a switching power supply solution. The resistive solution can also realize the function of lighting up when powered on, and it is low-cost, but it is difficult to meet the needs of the OEM for the brand logo of the car. This solution is unstable under various working conditions. The voltage transmitted when the car starts is unstable, which will cause the power supply signal received by the LOGO light to be unstable, and flickering will occur under certain circumstances; the switching power supply solution has a high circuit efficiency, and about 80% of the efficiency can be used to realize the function of the light-emitting diode, but the cost is very high, and this solution is difficult to rectify in the EMC experiment. For lamps such as LOGO, which have a relatively single function and limited size, few automobile OEMs will choose this solution. Summary of the invention

[0009] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a vehicle tail LOGO switch control system circuit with lower energy consumption, high overall working efficiency, safer circuit operation, and good heat dissipation and stability.

[0010] In order to solve the above technical problems, the technical solution of the utility model is:

[0011] A vehicle tail LOGO switch control system circuit includes a first power input processing module, a first drive module, a first load module, a second power input processing module, a second drive module and a second load module;

[0012] The input end of the first power input processing module is connected to the left power supply end of the vehicle body, the output end of the first power input processing module is connected to the input end of the first driving module, and the output end of the first driving module is connected to the first load module;

[0013] The input end of the second power input processing module is connected to the right power supply end of the vehicle body, the output end of the second power input processing module is connected to the input end of the second driving module, and the output end of the second driving module is connected to the second load module;

[0014] The first driving module and the second driving module are cascaded.

[0015] Further, the first power input processing module includes a TVS tube TG1, a capacitor C2, a capacitor C25 and a diode DG1, one end of the TVS tube TG1 is connected to the left power supply end of the vehicle body, and the other end of the TVS tube TG1 is grounded, one end of the capacitor C2 is connected to the left power supply end of the vehicle body, and the other end of the capacitor C2 is grounded, one end of the capacitor C25 is connected to the left power supply end of the vehicle body, and the other end of the capacitor C25 is grounded, the anode of the diode DG1 is connected to the left power supply end of the vehicle body, and the cathode of the diode DG1 is connected to the input end of the first drive module.

[0016] Furthermore, the second power input processing module includes a TVS tube TG2, a capacitor C3, a capacitor C26 and a diode DG1, one end of the TVS tube TG2 is connected to the right power supply end of the vehicle body, and the other end of the TVS tube TG2 is grounded, one end of the capacitor C3 is connected to the right power supply end of the vehicle body, and the other end of the capacitor C3 is grounded, one end of the capacitor C26 is connected to the right power supply end of the vehicle body, and the other end of the capacitor C26 is grounded, the anode of the diode DG2 is connected to the right power supply end of the vehicle body, and the cathode of the diode DG2 is connected to the input end of the second drive module.

[0017] Furthermore, the first driving module includes a first driving chip U1 , and the model of the first driving chip U1 is TPS92624.

[0018] Furthermore, the second driving module includes a second driving chip U2, and the model of the second driving chip U2 is TPS92624.

[0019] Furthermore, the first load module and the second load module are both LED light strings.

[0020] By adopting the above technical solution, the utility model has the following beneficial effects:

[0021] 1. The first driving module and the second driving module in the utility model can support the circuit to work under different input voltages, have better voltage adaptability and stability, can reduce chip energy consumption to a certain extent, provide sufficient brightness with lower energy consumption, improve the overall driving chip efficiency and stability, and better adapt to various complex working conditions; the LOGO light of the utility model can provide color control and brightness adjustment to adapt to different usage scenarios and preferences.

[0022] 2. The circuit solution used in the present invention can also solve the heat dissipation problem to a certain extent. Since the heat source is concentrated in the LED and driver chip parts, the present invention uses multiple 1206 packaged power resistors connected to the driver chip to reduce the power borne by the driver chip, thereby reducing the power of the driver chip itself, and dissipating the surrounding heat more effectively, which also prevents the driver chip from failing in a high temperature environment.

[0023] 3. The first drive module and the second drive module in the utility model can automatically shut down the circuit and report faults under high voltage input conditions; when the current exceeds the threshold, the internal circuit of the driver chip adopts a self-protection mechanism to achieve a current reduction effect. At the same time, the driver chip contains a PWM pin. If there is a dimming requirement, the duty cycle can be adjusted to achieve a smooth dynamic effect and avoid flickering and delay. The driving part needs to take into account the chip efficiency, stability, electromagnetic compatibility and electromagnetic interference. The chip in the circuit proposed by the utility model has a high working efficiency, works stably within the normal working voltage range, and also has strong electromagnetic compatibility and electromagnetic interference resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a principle block diagram of a vehicle tail LOGO switch control system circuit of the utility model;

[0025] Figure 2 This is a circuit schematic diagram of the first power input processing module of the utility model;

[0026] Figure 3 This is a circuit schematic diagram of the second power input processing module of the utility model;

[0027] Figure 4 This is a circuit schematic diagram of the first driving module of the utility model;

[0028] Figure 5 This is a circuit schematic diagram of the second driving module of the utility model;

[0029] Figure 6 This is a circuit schematic diagram of the first load module of the utility model;

[0030] Figure 7 This is a circuit schematic diagram of the second load module of the present utility model. DETAILED DESCRIPTION

[0031] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0032] like Figure 1As shown, this embodiment provides a vehicle tail LOGO switch control system circuit, which includes a first power input processing module, a first drive module, a first load module, a second power input processing module, a second drive module and a second load module.

[0033] The input end of the first power input processing module is connected to the left power supply end of the vehicle body, the output end of the first power input processing module is connected to the input end of the first drive module, and the output end of the first drive module is connected to the first load module.

[0034] The input end of the second power input processing module is connected to the right power supply end of the vehicle body, the output end of the second power input processing module is connected to the input end of the second drive module, and the output end of the second drive module is connected to the second load module.

[0035] The first driving module and the second driving module are cascaded.

[0036] like Figure 2 As shown, the first power input processing module of this embodiment includes a TVS tube TG1, a capacitor C2, a capacitor C25 and a diode DG1, one end of the TVS tube TG1 is connected to the left power supply end of the vehicle body, the other end of the TVS tube TG1 is grounded, one end of the capacitor C2 is connected to the left power supply end of the vehicle body, the other end of the capacitor C2 is grounded, one end of the capacitor C25 is connected to the left power supply end of the vehicle body, the other end of the capacitor C25 is grounded, the anode of the diode DG1 is connected to the left power supply end of the vehicle body, and the cathode of the diode DG1 is connected to the input end of the first drive module.

[0037] like Figure 3 As shown, the second power input processing module of this embodiment includes a TVS tube TG2, a capacitor C3, a capacitor C26 and a diode DG1, one end of the TVS tube TG2 is connected to the right power supply end of the vehicle body, the other end of the TVS tube TG2 is grounded, one end of the capacitor C3 is connected to the right power supply end of the vehicle body, the other end of the capacitor C3 is grounded, one end of the capacitor C26 is connected to the right power supply end of the vehicle body, the other end of the capacitor C26 is grounded, the anode of the diode DG2 is connected to the right power supply end of the vehicle body, and the cathode of the diode DG2 is connected to the input end of the second drive module.

[0038] Under the specified reverse application conditions, the TVS tube will present a high impedance state to the protected circuit. When the instantaneous voltage exceeds its breakdown voltage, the TVS tube will provide a low impedance path and divert the instantaneous current flowing to the protected components to the TVS tube through a large current, while reducing the voltage across the protected components. Therefore, TVS tubes TG1 and TG2 are placed at the input end to suppress transient spike interference. When the overvoltage condition disappears, the TVS diode returns to a high impedance state. Capacitors C2, C3, C25, and C26 filter the input power signal to reduce the interference of clutter on the electronic circuit, and prevent the power line from being short-circuited to the ground after the capacitor is short-circuited, causing abnormal function of the lamp. Diodes DG1 and DG2 are forward-conducting and reverse-cutoff to prevent damage to the lamp after the power signal is reversed.

[0039] like Figure 4 As shown, the first driving module of this embodiment adopts the first driving chip U1, the model of the first driving chip U1 is TPS92624, and a 100nF capacitor C1, a 1uF capacitor C5, current regulating resistors R3, R4, R15, R16, voltage dividing resistors R5, R6, R7, R8, power resistors RG1, RG2, RG3, RG7, RG8, RG9, 10nF capacitors LC1, LC2, LC3, C6, a voltage regulator diode LD1, and a pull-up resistor R1.

[0040] One end of capacitors C1 and C5, and voltage-dividing resistors R5 and R7 are connected to the SUPPLY pin of driver chip U1; one end of current-regulating resistors R3, R4, R15, R16 and voltage-dividing resistors R5 and R7 are connected to the cathode of diode DG1 of the first power input processing module, and the other end is connected to driver chip U1; power resistors RG1, RG2, RG3, RG7, RG8, RG9 are connected in parallel, one end is connected to the output terminal RES of driver chip U1, and the other end is connected to the first load module to share part of the power borne by driver chip U1. One end of the 5.1V voltage regulator is connected to the FAULT pin of driver chip U1, and one end is connected to the common ground; one end of pull-up resistor R1 is connected to the FAULT pin of driver chip U1, and the other end is connected to the cathode of diode DG1 of the first power input processing module.

[0041] When the circuit 13.5V is normally powered on to the first power input processing module, the power that the driver chip U1 in the first driver module should bear is P 总 -P LED-PDG1 However, in the circuit of this embodiment, the power of the driver chip U1 in the first driver module is shared by the power resistors, so that the power of each power resistor is less than 0.2W under the high temperature limit 16V condition. At this time, the power of the driver chip is greatly reduced, which improves the working state of the driver chip and prolongs its service life.

[0042] like Figure 5 As shown, the second driving module of this embodiment adopts the second driving chip U2, the model of the second driving chip U2 is TPS92624, and a 100nF capacitor C4, a 1uF capacitor C24, current regulating resistors R9, R10, R17, R18, voltage dividing resistors R11, R12, R13, R14, power resistors RG4, RG5, RG6, RG10, RG11, RG12, 10nF capacitors LC1, LC2, LC3, C6, a voltage regulator diode LD2, and a pull-up resistor R2.

[0043] One end of capacitors C4 and C24, and voltage-dividing resistors R11 and R13 are connected to the SUPPLY pin of driver chip U2; one end of current-regulating resistors R9, R10, R17, R18 and voltage-dividing resistors R12 and R14 are connected to the cathode of diode DG2 of the second power input processing module, and the other end is connected to the corresponding pin of driver chip U2; two power resistors RG4, RG5, RG6, RG10, RG11, and RG12 are connected in parallel, one end is connected to the output terminal RES of driver chip U2, and the other end is connected to the second load module to share part of the power borne by driver chip U2. One end of the 5.1V voltage regulator is connected to the FAULT pin of driver chip U2, and the other end is connected to the common ground; one end of pull-up resistor R2 is connected to the FAULT pin of chip, and the other end is connected to the cathode of diode DG2 of the second power input processing module.

[0044] Two different capacitors are generally placed at the SUPPLY pin input end of the driver chip, one large capacitor and one small capacitor, to further filter out the noise signals transmitted from the first power input processing module; the input pin IN is placed with current regulating resistors R3, R4, R15, and R16 to adjust the current size of the output end OUT. Each IN pin corresponds to an OUT pin. If there is an OUT at the output end that is not used, the corresponding IN pin still needs to be placed with a current regulating resistor and connected to the power input end. It cannot be left floating or connected to the common ground; DIAGEN is equivalent to the enable pin of the driver chip, which can be used to detect LED open circuit. The two resistors with larger resistance values ​​are used to avoid false open circuit diagnosis during low voltage difference operation; the PWM pin input also supports adjusting the average current output for brightness control, for example, using a 200Hz PWM signal, where a 1% to 100% duty cycle input is used for brightness control. The PWM pin and the output terminal OUT also have a one-to-one correspondence. If a PWM pin is not used, the pin is connected to the common ground, and the corresponding OUT pin is left floating. The FAULT pin of the driver chip is a fault output pin. It has two modes, one is one-fails-all-fail, and the other is one-fails-others-on. Different modes correspond to different peripheral circuits. This article uses one-fails-all-fail, and uses a voltage regulator and a pull-up resistor to keep the FAULT pin high. The first driver module and the second driver module are cascaded through the FAULT pins of the driver chips U1 and U2.

[0045] The IN, DIAGEN, and PWM pins in the driver chip are all high-level input pins, and the OUT and RES pins are high-level output pins. The driver chip can detect and protect against faults in the case of LED string short circuit, LED string open circuit, and node overtemperature. It also supports single-fault full-fault bus design and can flexibly adapt to different circuit requirements. In the first driver module and the second driver module, different output capacitors are used to reduce the interference of clutter current, thereby improving the anti-interference performance of the driver chip in the driver module.

[0046] like Figure 6 , 7 As shown, the first load module and the second load module of this embodiment are both LED light strings.

[0047] like Figure 6 As shown, the first load module includes a number of light-emitting diodes and capacitors; every three light-emitting diodes are connected in series, one end of the series connection is connected to the output end of the driver chip U1 in the first driver module, and the other end is connected to the common ground. A capacitor is connected in parallel next to each light-emitting diode to filter out interference near the light-emitting diode, prevent light flickering, and extend the service life of the light-emitting diode.

[0048] like Figure 7As shown, the second load module includes a number of light-emitting diodes and capacitors, and every three light-emitting diodes are connected in series, one end of the series connection is connected to the output end of the driver chip U2 in the second driver module, and the other end is connected to the common ground. Each light-emitting diode is connected in parallel with a capacitor to filter out interference near the light-emitting diode to prevent light flickering, and at the same time can extend the service life of the light-emitting diode.

[0049] The LED is selected based on the single luminous flux and chromaticity requirements of the LOGO light. The LED must meet the luminous intensity of the LOGO light and match the chromaticity requirements of the tail lamp and relevant regulatory requirements.

[0050] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are 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. A vehicle tail LOGO switch control system circuit, characterized in that: It includes a first power input processing module, a first driving module, a first load module, a second power input processing module, a second driving module and a second load module; The input end of the first power input processing module is connected to the left power supply end of the vehicle body, the output end of the first power input processing module is connected to the input end of the first driving module, and the output end of the first driving module is connected to the first load module; The input end of the second power input processing module is connected to the right power supply end of the vehicle body, the output end of the second power input processing module is connected to the input end of the second driving module, and the output end of the second driving module is connected to the second load module; The first driving module and the second driving module are cascaded.

2. The vehicle tail LOGO switch control system circuit according to claim 1, characterized in that: The first power input processing module includes a TVS tube TG1, a capacitor C2, a capacitor C25 and a diode DG1, one end of the TVS tube TG1 is connected to the left power supply end of the vehicle body, and the other end of the TVS tube TG1 is grounded, one end of the capacitor C2 is connected to the left power supply end of the vehicle body, and the other end of the capacitor C2 is grounded, one end of the capacitor C25 is connected to the left power supply end of the vehicle body, and the other end of the capacitor C25 is grounded, the anode of the diode DG1 is connected to the left power supply end of the vehicle body, and the cathode of the diode DG1 is connected to the input end of the first drive module.

3. The vehicle tail LOGO switch control system circuit according to claim 1, characterized in that: The second power input processing module includes a TVS tube TG2, a capacitor C3, a capacitor C26 and a diode DG1, one end of the TVS tube TG2 is connected to the right power supply end of the vehicle body, and the other end of the TVS tube TG2 is grounded, one end of the capacitor C3 is connected to the right power supply end of the vehicle body, and the other end of the capacitor C3 is grounded, one end of the capacitor C26 is connected to the right power supply end of the vehicle body, and the other end of the capacitor C26 is grounded, the anode of the diode DG2 is connected to the right power supply end of the vehicle body, and the cathode of the diode DG2 is connected to the input end of the second drive module.

4. The vehicle tail LOGO switch control system circuit according to claim 1, characterized in that: The first driving module includes a first driving chip U1 , and the model of the first driving chip U1 is TPS92624.

5. The vehicle tail LOGO switch control system circuit according to claim 1, characterized in that: The second driving module includes a second driving chip U2 , and the model of the second driving chip U2 is TPS92624.

6. The vehicle tail LOGO switch control system circuit according to claim 1, characterized in that: The first load module and the second load module are both LED light strings.

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