An RGB circuit

Abstract

The utility model relates to a kind of RGB circuit, including power supply end processing module, LIN filter module, signal processing module, MCU processing module, touch piece and LED module, the input end of power supply end processing module is connected with the power supply of car body BCM, the output end of power supply end processing module connects touch piece.LIN filter module's input end receives car body LIN signal end, the output end of LIN filter module is connected with signal processing module.Touch piece is connected with MCU processing module signal, and MCU processing module includes atmosphere lamp drive chip module and touch chip drive module.Signal processing module's input end connects car body CAN signal end, and the output end of signal processing module connects MCU processing module.The circuit scheme that the utility model adopts can support car body LIN communication, and touch circuit supports CAN communication, does not interfere with each other, and the stability and reliability of circuit are improved;When car body gives communication signal or has touch signal, it can be illuminated.

Description

Technical Field

[0001] This utility model relates to the field of vehicle lighting control technology, and in particular to an RGB circuit. Background Technology

[0002] Ambient lighting is one type of interior lighting in existing automotive lighting technology. It creates a sense of technology for passengers and drivers while providing a visually appealing experience with different colors. It is typically installed in areas such as front and rear door handles, dashboard, storage compartments, glove boxes, or center console. Ambient lighting generally comes in single or multiple colors. A single color refers to a fixed color such as yellow, purple, or another color. Multiple colors refer to different chromaticity coordinates achieved by adjusting the three primary colors of red, green, and blue, resulting in a more subtle color mixing. To achieve a more sophisticated effect, typical RGB circuits interact with LIN or CAN signals from the vehicle body. However, due to differences in optical methods, some ambient lighting modules using reflective light guides have several modules installed relatively far apart, leading to uneven temperature distribution and resulting in color variations. Some ambient lighting circuits operate via vehicle power and communication signals, and their operation cannot be controlled by touching key locations. Utility Model Content

[0003] The technical problem to be solved by this utility model is: in order to overcome the above-mentioned technical problems, this utility model provides an RGB circuit.

[0004] The technical solution adopted by this utility model to solve its technical problem is: an RGB circuit, including a power supply processing module, a LIN filtering module, a signal processing module, an MCU processing module, a touch panel, and an LED module.

[0005] The input terminal of the power supply processing module is connected to the power supply of the body BCM (Body Controller), and the output terminal of the power supply processing module is connected to the touch panel.

[0006] The input terminal of the LIN filter module receives the LIN signal from the vehicle body, and the output terminal of the LIN filter module is connected to the signal processing module. The LIN filter module is used to perform capacitor filtering on the LIN signal from the vehicle body.

[0007] The touch panel is connected to the MCU processing module for signal transmission.

[0008] The MCU processing module includes an ambient light driver chip module for driving the LED module and a touch chip driver module for driving the touch pad.

[0009] The input terminal of the signal processing module is connected to the vehicle body CAN signal terminal, and the output terminal of the signal processing module is connected to the MCU processing module. The signal processing module is used to convert the signal from the vehicle body BCM to the lights into the signal required by the touch chip driver module.

[0010] The LED module is an integrated LED lighting unit that combines red, green, and blue primary colors, and must meet brightness and color requirements.

[0011] The ambient light driver chip module includes a driver chip U1, which has a communication signal input terminal and multiple LED driver ports. The communication signal input terminal of the driver chip U1 is connected to the LIN_IN signal output by the signal processing module, and each set of LED driver ports is connected to a set of LED modules.

[0012] The driver chip U1 has an analog input pin and a 5V voltage output terminal. The analog input pin is connected to the 5V voltage output terminal through an inductor L1. The analog input pin is connected to a first resistor R1, an input capacitor C1, and an input Zener diode D1. The first resistor R1 and the input capacitor C1 are connected in series and then grounded. The positive terminal of the input Zener diode D1 is grounded, and the negative terminal of the input Zener diode D1 is connected to the analog input pin. The 5V voltage output terminal is connected in parallel with an output resistor R2 and multiple output capacitors.

[0013] The driver chip U1 is an iND83211QFN48 package from INDI Semiconductor.

[0014] The LIN filtering module includes an electrostatic discharge (ESD) diode T1, an input processing capacitor C2, a ferrite bead B1, a decoupling capacitor, and a ground resistor R22. One end of the ESD diode T1 is connected to the vehicle body LIN signal terminal, and the other end of the ESD diode T1 is grounded. One end of the input processing capacitor C2 is connected to the vehicle body LIN signal terminal, and the other end of the input processing capacitor C2 is grounded. One end of the ferrite bead B1 is connected to the vehicle body LIN signal terminal, and the other end of the ferrite bead B1 is connected to the LIN_IN signal output by the signal processing module through the decoupling capacitor and the ground resistor R22. The decoupling capacitor and the ground resistor R22 are connected in parallel and then grounded.

[0015] The signal processing module includes a CAN transceiver chip U3. The input terminal of the CAN transceiver chip U3 is connected to the vehicle body CAN signal terminal, and the output terminal of the CAN transceiver chip U3 is connected to the signal input terminal of the touch chip driver module.

[0016] The touch chip driver module includes a touch chip U2. The driver chip U1 has a 3.3V voltage output terminal. The touch chip U2 has a built-in temperature sensor. The touch chip U2 has an enable terminal, a signal input terminal, and multiple sets of LED brightness control ports. The enable terminal is connected to the 3.3V voltage output terminal of the driver chip U1. Each set of LED brightness control ports is connected to a set of LED modules. The signal input terminal of the touch chip U2 is connected to the output terminal of the CAN transceiver chip U3.

[0017] The touch chip U2 is model AVR32DA48-E / PT from Microchip Technology, Inc.

[0018] Each LED module includes three LED beads: red, green, and blue. The positive terminal of each LED bead is connected to the 5V voltage output terminal of the driver chip U1. The negative terminals of the three LED beads are connected in parallel and then connected to the brightness control port of the touch chip U2LED through a current-limiting resistor.

[0019] The touch pad is a carrier that supports touch. The touch pad is made of flexible circuit board, PET film, coil, copper sheet or metal spring.

[0020] The RGB circuit of this utility model has the following beneficial effects:

[0021] The adopted circuit scheme supports LIN communication for the vehicle body and CAN communication for the touch circuit, without interference, thus improving the stability and reliability of the circuit. It can realize functions such as constant light and dynamic sequential lighting, and also supports touch-activated lighting or turning-off functions. It can be lit when the vehicle body sends a communication signal or when there is a touch signal. It has a temperature protection function to improve the stability of the entire circuit. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a system block diagram of the RGB circuit of this utility model.

[0024] Figure 2 This is a circuit diagram of the power supply processing module and ambient light driver chip module for the RGB circuit of this utility model.

[0025] Figure 3 This is the circuit diagram of the LIN filter module of the RGB circuit of this utility model.

[0026] Figure 4 This is a circuit diagram of the processing module of the ambient light driver chip for the RGB circuit of this utility model.

[0027] Figure 5This is the circuit diagram of the signal processing module of the RGB circuit of this utility model.

[0028] Figure 6 This is a circuit diagram of the touch chip driver module of the RGB circuit of this utility model.

[0029] Figure 7 This is the LED module circuit diagram of the RGB circuit of this utility model. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0031] like Figure 1 As shown, this utility model discloses an RGB circuit including a power supply processing module, a LIN filtering module, a signal processing module, an MCU processing module, a touch panel, and an LED module. The input of the power supply processing module is connected to the power supply of the vehicle body BCM, and the output is connected to the touch panel. The input of the LIN filtering module receives the vehicle body LIN signal, and the output is connected to the signal processing module. The LIN filtering module performs capacitive filtering on the vehicle body LIN signal. The touch panel is signal-connected to the MCU processing module. The MCU processing module includes an ambient light driver chip module for driving the LED module and a touch chip driver module for driving the touch panel. The input of the signal processing module is connected to the vehicle body CAN signal terminal, and the output is connected to the MCU processing module. The signal processing module converts the signal from the vehicle body BCM to the lighting fixture into the signal required by the touch chip driver module. The LED module is an integrated red, green, and blue LED lighting unit that meets brightness and color requirements.

[0032] like Figure 2As shown, the ambient light driver chip module includes driver chip U1, which is an iND83211QFN48 package from Indispensing. Driver chip U1 has a communication signal input terminal and multiple LED driver ports. The communication signal input terminal of driver chip U1 connects to the LIN_IN signal output from the signal processing module. Each set of LED driver ports connects to a corresponding set of LED modules. The first pin of driver chip U1 is grounded via C51 and is one of the software reprogramming ports. The second pin is grounded via C50 and connected to the SWDIO network, also one of the software reprogramming ports. The third pin is connected to the VDD3V3 network via ferrite bead B4, providing the internal 3.3V voltage output of driver chip U1. The fourth pin is connected to the VDD1V5 network via B3, providing the internal 5.1V voltage output of driver chip U1. Pin 16 of driver chip U1 is the communication signal input terminal, connected to the LIN_IN network. The power supply is connected to a bidirectional Zener diode T2. The function of Zener diode T2 is to clamp both positive and negative transient voltages when an ESD-induced high-pulse voltage occurs. Capacitors C15 and C4 are connected in parallel as bypass capacitors and should be placed as close as possible to the power input to filter out high-frequency noise. Then, the circuit passes through diode D2, which can carry a certain amount of current with low power consumption. Ferrite bead B2 eliminates transient spike interference in the circuit, protecting sensitive electronic components. Pull-down resistor R23 reduces rise time errors during function switching at the moment the driver chip U1 is powered on. Capacitors C16, C6, and C5 are connected to pins 17 and 18 of the chip's power input. The VBAT network is one of the software programming points for driver chip U1. Pin 20 is connected to the GND network. Pin 21 of driver chip U1 is the internal 5V voltage output. Pin 22 is connected to the GND network. Pin 23 is the analog input pin of driver chip U1. Pin 24 is the analog input pin of driver chip U1. Pins 25 to 30 are connected to LED3_EN, controlling the third group of LED modules. Similarly, pins 37 to 42 are connected to the LED2_EN network, controlling the second group of LED modules. Pins 43 to 48 are connected to the LED1_EN network, controlling the first group of LED modules.

[0033] like Figure 3 As shown, when the LIN signal from the vehicle body is sent to the lights, it first passes through the electrostatic discharge protection diode T1, and capacitor C2 is the input processing capacitor C2. C52 and C1 are connected in parallel as decoupling capacitors to reduce the switching noise generated by the input network over a wider frequency spectrum. The resistor to ground R22 can absorb excess small signal current. The LIN_IN network is connected to pin 16 of the driver chip U1.

[0034] like Figure 4As shown, pin 23 (BULXO) of driver chip U1 is connected to inductor L1. Resistor R1 and capacitor C7 form an RC series filter. Zener diode D1 acts as an input Zener diode for protection, and capacitors C8-C11 are output capacitors. Output resistor R2 serves to distribute some current. The output VDD5P0 network is connected to pin 21 of driver chip U1.

[0035] like Figure 5 As shown, pin 1 of the CAN transceiver chip U3 is connected to network CA_TXD_H via ferrite bead B5 and capacitor C49, and is connected to pin 44 of the touch chip U2. Pin 2 is connected to the GND ground terminal. Pin 3 is connected to the power network and grounded via capacitors C40, C39, and C47. Pin 4 is connected to network CA_RXD_L via ferrite bead B6 and capacitor C48, and is connected to pin 45 of the touch chip U2. CA_H and CA_L in the CAN signal are connected to pins 6 and 7 of the CAN transceiver chip U3 via resistors R24 and R25. T3 is an electrostatic discharge (ESD) protection diode for the CAN signal. Pin 8 of the CAN transceiver chip U3 is grounded via resistor R19.

[0036] like Figure 6As shown, U2 is the touch chip, using Microchip's AVR32DA48-E / PTVAO. Pin 1 of touch chip U2 is connected to the First reference value network via resistor R4 and capacitor C27, providing the capacitance reference value for the first channel of the internal capacitance detection module. Similarly, pin 5 is connected to the Second reference value network via resistor R6 and capacitor C28, providing the capacitance reference value for the second channel of the internal capacitance detection module. Pin 11 is connected to the Third reference value network via resistor R7 and capacitor C29, providing the capacitance reference value for the third channel of the internal capacitance detection module. The working principle is based on the capacitance change corresponding to touch sensing. This example demonstrates touch conversion via a touch diaphragm, which refers to a PET film touchpad. The human body naturally has a reference capacitance value relative to the ground under different temperature and environmental factors. When the lamp receives an external touch, it generates the relative capacitance value of the human body to the ground network, the relative capacitance value of the positive and negative electrodes of the touch diaphragm to the ground network, and the relative capacitance value of the entire ground network circuit. When the lamp does not receive an external touch, only the relative capacitance value of the entire ground network circuit is available. Therefore, when the touch diaphragm first senses a signal, pin 1 of the touch chip U2 compares the real-time capacitance value with the chip's internal first reference capacitance value. Based on the capacitance change error and corresponding algorithms, it identifies whether a touch state has occurred. Similarly, pins 5 and 11 of the touch chip U2 sequentially adjust the capacitance change error based on the number of touches to identify the touch state internally. Pins 14 and 15 of the touch chip U2 provide the enable voltage to turn the chip on. The recommended capacitance values ​​for capacitors C17, C22, and C26 are 100pF, 10nF, and 1uf, respectively. This ensures a more stable power supply voltage. The connected network is pin 3 (VDD3V3) of driver chip U1. This means that when the voltage at pins 14 and 15 of touch chip U2 is 3.3V, it enters normal operation. Pin 20, connected in series with resistor MR4 and capacitor C30, is the First Touch network. When the touch diaphragm first detects an external touch, a certain force is applied to the surface of the diaphragm. At this time, the pressure sensor inside touch chip U2 compares this force with a reference value indicating no pressure. Similarly, according to the order in which the touch diaphragm is subjected to external force, pins 22 and 24 of touch chip U2 are connected to the Second Touch and Third Touch networks, respectively.The diaphragm's touch status is determined by the real-time error change between the diaphragm and the reference value of the internal pressure sensor. Pins 28 and 29 of the touch chip U2 are connected to pin 3 (VDD3V3) of the driver chip U1, providing the driver chip U1 with its operating voltage. Pin 30 is connected to the LED3_EN network via resistor R9 and capacitor C35, controlling the brightness and on / off status of the third group of LED modules. Pin 32 is connected to the Tp network. Depending on the operating state of the lamp, the operating temperature of the touch chip U2 may exceed its maximum temperature tolerance. Voltage sampling through resistors R27, R29, and R28 feeds the voltage value back to the internal temperature sensor on pin 32 of the touch chip U2. The voltage collected by the internal temperature sensor can be set to a function relationship with the chip's own temperature, allowing for real-time temperature detection. When the temperature approaches a threshold, appropriate actions such as shutting down the chip can be taken to protect the components in the circuit. Similarly, pin 34 is connected to the LED2_EN network via resistor MR3 and capacitor C34 to control the brightness of the second group of LED modules. Pin 36, connected to the LED1_EN network via resistor MR2 and capacitor C33, controls the brightness of the first LED module. Pin 40, connected to the RST network via resistor MR7, is the chip's reset pin and one of the programming ports for repeated chip software updates. Pin 41, connected to the UPDI network via resistor MR1, is also one of the programming ports for repeated chip software updates. Pins 42 and 43, connected to the VDD3V3 network (pin 3) of driver chip U1 via capacitors C23, C19, C24, and resistor R26, are used to implement asynchronous serial interface communication via the CA_TXD_H and CA_TXD_L networks, which are converted from the vehicle body CAN signals by the CAN transceiver chip U3. This allows for the transmission and reception of vehicle body signals to achieve the corresponding lighting modes and effects.

[0037] like Figure 7 As shown, this example uses three LED modules. Each LED module consists of one red, one green, and one blue LED. The RED, GRE, and BLU brightness bins, chromaticity bins, and voltage bins of each LED are different. Due to differences in LED characteristics and manufacturing processes, green and blue LEDs generally have a higher maximum current handling capacity than red. Green has the highest brightness, followed by red, and then blue. The IRGB color mixing mechanism is achieved by adjusting the brightness (duty cycle) of each chip, with the blue chip playing a dominant role. Figure 7D3 contains three LEDs: RED, GER, and BLU. Capacitor C36 is a shared processing capacitor for all three types of LEDs. The positive terminal of each LED is connected to pin 21 (VDD5P0) of driver chip U1. The negative terminals of each LED are connected together to three resistors, and the network LED1_EN is used by touch chip U2 to control each individual LED. Similarly, D4 and D5 operate on a similar principle. The negative terminals of each LED, connected through resistors, are linked to networks LED2_EN and LED3_EN, which are used by touch chip U2 to control each individual LED.

[0038] This utility model's RGB circuit enables touch-activated RGB lighting, allowing for different brightness and color adjustments, i.e., subtle color effects. Without interrupting power to the lamp, the circuit can be activated on the first touch, adjusted on the second touch, deactivated on the third touch, and activated again on the fourth touch, repeating this cycle continuously.

[0039] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An RGB circuit, characterized in that: It includes a power supply processing module, a LIN filtering module, a signal processing module, an MCU processing module, a touch panel, and an LED module; The input terminal of the power supply processing module is connected to the power supply of the vehicle body BCM, and the output terminal of the power supply processing module is connected to the touch panel. The input terminal of the LIN filter module receives the LIN signal terminal of the vehicle body, and the output terminal of the LIN filter module is connected to the signal processing module. The LIN filter module is used to perform capacitor filtering on the LIN signal of the vehicle body. The touch panel is connected to the MCU processing module via signal transmission. The MCU processing module includes an ambient light driver chip module for driving the LED module and a touch chip driver module for driving the touch pad. The input terminal of the signal processing module is connected to the vehicle body CAN signal terminal, and the output terminal of the signal processing module is connected to the MCU processing module. The signal processing module is used to convert the signal from the vehicle body BCM to the lights into the signal required by the touch chip driver module. The LED module is an integrated LED lighting unit that incorporates red, green, and blue primary colors.

2. The RGB circuit as described in claim 1, characterized in that: The ambient light driver chip module includes a driver chip U1, which has a communication signal input terminal and multiple LED driver ports. The communication signal input terminal of the driver chip U1 is connected to the LIN_IN signal output by the signal processing module, and each set of LED driver ports is connected to a set of LED modules.

3. The RGB circuit as described in claim 2, characterized in that: The driver chip U1 has an analog input pin and a 5V voltage output terminal. The analog input pin is connected to the 5V voltage output terminal through an inductor L1. The analog input pin is connected to a first resistor R1, an input capacitor C1, and an input Zener diode D1. The first resistor R1 and the input capacitor C1 are connected in series and then grounded. The positive terminal of the input Zener diode D1 is grounded, and the negative terminal of the input Zener diode D1 is connected to the analog input pin. The 5V voltage output terminal is connected in parallel with an output resistor R2 and multiple output capacitors.

4. The RGB circuit as described in claim 2, characterized in that: The driver chip U1 is an iND83211 QFN48 package from INDI Semiconductor.

5. The RGB circuit as described in claim 1, characterized in that: The LIN filtering module includes an electrostatic discharge (ESD) diode T1, an input processing capacitor C2, a ferrite bead B1, a decoupling capacitor, and a ground resistor R22. One end of the ESD diode T1 is connected to the vehicle body LIN signal terminal, and the other end of the ESD diode T1 is grounded. One end of the input processing capacitor C2 is connected to the vehicle body LIN signal terminal, and the other end of the input processing capacitor C2 is grounded. One end of the ferrite bead B1 is connected to the vehicle body LIN signal terminal, and the other end of the ferrite bead B1 is connected to the LIN_IN signal output by the signal processing module through the decoupling capacitor and the ground resistor R22. The decoupling capacitor and the ground resistor R22 are connected in parallel and then grounded.

6. The RGB circuit as described in claim 3, characterized in that: The signal processing module includes a CAN transceiver chip U3. The input terminal of the CAN transceiver chip U3 is connected to the vehicle body CAN signal terminal, and the output terminal of the CAN transceiver chip U3 is connected to the signal input terminal of the touch chip driver module.

7. The RGB circuit as described in claim 6, characterized in that: The touch chip driver module includes a touch chip U2, which has a built-in temperature sensor. The driver chip U1 has a 3.3V voltage output terminal. The touch chip U2 has an enable terminal, a signal input terminal, and multiple LED brightness control ports. The enable terminal is connected to the 3.3V voltage output terminal of the driver chip U1. Each set of LED brightness control ports is connected to a set of LED modules. The signal input terminal of the touch chip U2 is connected to the output terminal of the CAN transceiver chip U3.

8. The RGB circuit as described in claim 1, characterized in that: The touch chip U2 is model AVR32DA48-E / PT from Microchip Technology, Inc.

9. The RGB circuit as described in claim 7, characterized in that: Each LED module includes three LED beads: red, green, and blue. The positive terminal of each LED bead is connected to the 5V voltage output terminal of the driver chip U1. The negative terminals of the three LED beads are connected in parallel and then connected to the brightness control port of the touch chip U2LED through a current-limiting resistor.

10. The RGB circuit as described in claim 1, characterized in that: The touch pad is made of flexible circuit board, PET film, coil, copper sheet or metal spring.

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