An automotive interior mood light driving circuit

Abstract

The utility model discloses a kind of automobile interior atmosphere lamp drive circuits, it is related to the technical field of automobile interior atmosphere lamp, including single-chip module, LED drive module and ADC voltage acquisition module, the LED drive module is electrically connected with single-chip module, the output end of the LED drive module is electrically connected with LED module, the LED drive module received single-chip PWM signal conversion output constant electric signal control LED module, the ADC voltage acquisition module is electrically connected with single-chip module, for collecting LED module cathode end voltage, and for analog signal is converted into digital signal, it is convenient for single-chip processing and analysis, the single-chip module is also electrically connected with power module and LIN communication module;The utility model collects voltage information through ADC voltage acquisition module at LED cathode end, improves the precision and timeliness of software temperature compensation, increases anti-interference ability, reduces the influence of external interference.

Description

Technical Field

[0001] This utility model relates to the field of automotive interior ambient lighting technology, specifically to an automotive interior ambient lighting driving circuit. Background Technology

[0002] With the rapid development of the automotive industry, the market penetration rate of ambient lighting is gradually increasing, the number of automotive interior ambient lights is gradually increasing, and the requirements for the color, brightness consistency and stability of the overall vehicle ambient lighting are becoming more and more stringent.

[0003] Most existing ambient lighting circuit solutions rely on software algorithms for compensation. They acquire the PN junction voltage of the LED via a microcontroller's PWM pin, obtain temperature compensation parameters based on the LED's temperature compensation curve, and then use these parameters to compensate for the target color. The compensated target color is then output via the microcontroller's PWM signal, achieving consistency and stability in color and brightness. However, existing solutions still have the following drawbacks:

[0004] 1) Existing single-chip drive dual-LED circuits use time-division multiplexing, which can easily lead to a situation where color and brightness cannot be synchronized during debugging;

[0005] 2) In the presence of external interference, the software algorithm may not be able to achieve the ideal temperature compensation effect at the corresponding temperature, resulting in untimely compensation and affecting the accuracy of temperature compensation.

[0006] Therefore, a driver circuit for automotive interior ambient lighting is needed to solve the above problems. Utility Model Content

[0007] The purpose of this utility model is to provide a driving circuit for automotive interior ambient lighting to solve the problems existing in the prior art mentioned in the background section.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A driving circuit for automotive interior ambient lighting includes a microcontroller module, an LED driving module, and an ADC voltage acquisition module. The LED driving module is electrically connected to the microcontroller module, and the output terminal of the LED driving module is electrically connected to an LED module. The LED driving module converts the received PWM signal from the microcontroller into a constant electrical signal to control the LED module.

[0010] The ADC voltage acquisition module is electrically connected to the microcontroller module and is used to acquire the voltage at the cathode of the LED module and to convert the analog signal into a digital signal for processing and analysis by the microcontroller.

[0011] The microcontroller module is also electrically connected to a power supply module and a LIN communication module. The power supply module provides a stable voltage input for the microcontroller and various functional modules. The LIN communication module connects the microcontroller to the vehicle body LIN bus, receives signals sent by the microcontroller and transmits them to the LIN bus, and converts the LIN bus signals into signals that can be read by the microcontroller.

[0012] Preferably, the LED module contains two LED beads, which are connected in series.

[0013] Preferably, the power module includes a power regulator chip, a TVS diode, a diode, a resistor, a capacitor, and a ferrite bead, and the power module is used to step down the vehicle body voltage of 12V to 5V for output.

[0014] Preferably, the LIN communication module includes a LIN transceiver, resistors, capacitors, ferrite beads, and an ESD diode, wherein the ESD diode D5 is used to protect the LIN transceiver from damage caused by external instantaneous spike pulse impacts.

[0015] Preferably, the microcontroller module includes a microcontroller, a debugging interface, a crystal oscillator circuit, and a reset circuit. The debugging interface is used for downloading and debugging the microcontroller's program, the crystal oscillator circuit provides a clock signal to the microcontroller, and the reset circuit is used for initializing the microcontroller's internal circuitry.

[0016] Preferably, the LED driving module includes a transistor, an N-MOS transistor, a resistor, and a capacitor, wherein the transistor is an NPN transistor.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. In this utility model, the two LED beads are connected in series. According to the received signal, the LED driver module can display the brightness and color of the two LED beads synchronously to meet the overall consistency requirements.

[0019] 2. This utility model acquires voltage information at the LED cathode through an ADC voltage acquisition module, which improves the accuracy and timeliness of software temperature compensation, increases anti-interference capability, and reduces the impact of external interference. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 This is the electrical schematic diagram of the power supply module of this utility model.

[0022] Figure 3 This is the electrical schematic diagram of the LIN communication module of this utility model.

[0023] Figure 4This is the electrical schematic diagram of the microcontroller module of this utility model.

[0024] Figure 5 This is the electrical schematic diagram of the LED driver module 1 of this utility model.

[0025] Figure 6 This is the electrical schematic diagram of the LED driver module 2 of this utility model.

[0026] Figure 7 This is the electrical schematic diagram of the LED module of this utility model. Detailed Implementation

[0027] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0028] Please see Figure 1-7 The present invention provides the following technical solution:

[0029] A driving circuit for automotive interior ambient lighting includes a microcontroller module, an LED driver module, and an ADC voltage acquisition module. The LED driver module is electrically connected to the microcontroller module, and the output terminal of the LED driver module is electrically connected to an LED module. The LED driver module converts the received PWM signal from the microcontroller into a constant electrical signal to control the LED module. The LED module displays the required color and brightness according to the electrical signal output by the LED driver module. The LED module contains two LED beads connected in series, and the two LED beads can synchronously display brightness and color to meet overall consistency.

[0030] like Figure 4 As shown, the microcontroller module includes a microcontroller, a debugging interface, a crystal oscillator circuit, and a reset circuit. The debugging interface is used for downloading and debugging the microcontroller's program. The crystal oscillator circuit provides a clock signal to the microcontroller, and the reset circuit is used for initializing the microcontroller's internal circuitry. The crystal oscillator circuit consists of a crystal Y1 and resistors and capacitors, while the reset circuit consists of resistors and capacitors. The ADC voltage acquisition module is electrically connected to the microcontroller module and is used to acquire the voltage at the cathode of the LED module and convert the analog signal into a digital signal for processing and analysis by the microcontroller.

[0031] The LED driver module includes a transistor, an N-MOS transistor, a resistor, and a capacitor, wherein the transistor is an NPN transistor; this utility model provides two LED driver modules, such as... Figure 5As shown, LED driver module 1 includes an NPN transistor, an N-MOS transistor, resistors, and capacitors. Q4 is an NPN transistor, and MOS1 is an N-MOS transistor. When the PWM3 output from pin P2.0 of chip U1 is high, pins 2 and 3 of Q4 are in a conducting state, thus pulling the level of pin 2 of Q4 high. At this time, the potential difference between pins 1 and 3 of MOS1 is greater than 0, MOS1 is turned on, and pin 3 of MOS1 is low. Then, according to... Figure 7 As shown, the LED displays blue light at this time. The voltage across R34 can be measured using Ohm's law to calculate the current through the resistor. Pin 2 AD1 of MOS1 is connected to pin P1.7 of U1, which can be used to acquire the voltage across R34.

[0032] like Figure 6 As shown, LED driver module 2 includes NPN transistors, N-MOS transistors, resistors, and capacitors. Q2 and Q3 are NPN transistors, and Q1 is an integrated component consisting of two N-MOS transistors. When the P3.5 pin PWM2 or the P3.4 pin PWM1 of chip U1 outputs a high level to pin 1 of Q2 or Q3, pins 2 and 3 of Q2 or Q3 are in a conducting state, thereby pulling the level of pin 2 of Q2 or Q3 high. At this time, the potential difference between pins 2 and 1 of Q1 is greater than 0, or the potential difference between pins 5 and 6 is greater than 0, Q1 is turned on, and pin 3 (GREEN) or pin 6 (RED) of Q1 is low. Then, according to... Figure 7 As shown, the LED displays red or green light at this time. The voltage across R13 can be measured using Ohm's law to calculate the current through the resistor. Pin 1 (AD2) of Q1 is connected to pin P2.3 of U1 to acquire the voltage across R13. Similarly, the voltage across R14 can be measured using Ohm's law to calculate the current through the resistor. Pin 4 (AD3) of Q1 is connected to pin P2.2 of U1 to acquire the voltage across R14. The voltage feedback signal is then fed back to the microcontroller for processing. The microcontroller then controls the output signal of the LED driver module to improve the accuracy of temperature compensation, increase anti-interference capability, and reduce the influence of external interference.

[0033] The microcontroller module is also electrically connected to a power supply module and a LIN communication module. The power supply module provides a stable voltage input for the microcontroller and various functional modules. The LIN communication module connects the microcontroller to the vehicle body LIN bus, receives signals sent by the microcontroller and transmits them to the LIN bus, and converts the LIN bus signals into signals that can be read by the microcontroller.

[0034] The power module includes a voltage regulator chip, a TVS diode, a diode, resistors, capacitors, and a ferrite bead, such as... Figure 2As shown, U1 is a power regulator chip used to step down the 12V vehicle voltage to 5V for the microcontroller output. TVS diode D4 is connected in parallel in the power line to protect the circuit from transient overvoltage impacts such as surges. Diode D3 has unidirectional conductivity and serves to prevent reverse connection of positive and negative terminals. The INH network tag is the enable control of U1 by the LIN communication module, realizing the power supply wake-up function in the microcontroller's sleep state.

[0035] The LIN communication module includes a LIN transceiver, resistors, capacitors, ferrite beads, and ESD diodes, such as... Figure 3 As shown, U2 is a LIN transceiver, used to convert signals on the LIN bus into digital signals that can be processed by the microcontroller, and to convert digital signals output by the microcontroller into signals on the LIN bus, enabling the output and transmission of LIN signals; the ESD diode D5 is used to protect the LIN transceiver from damage caused by external instantaneous spike pulse impacts.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A driving circuit for automotive interior ambient lighting, characterized in that, It includes a microcontroller module, an LED driver module, and an ADC voltage acquisition module. The LED driver module is electrically connected to the microcontroller module, and the output terminal of the LED driver module is electrically connected to the LED module. The LED driver module converts the received PWM signal from the microcontroller into a constant electrical signal to control the LED module. The ADC voltage acquisition module is electrically connected to the microcontroller module and is used to acquire the voltage at the cathode of the LED module and to convert the analog signal into a digital signal for processing and analysis by the microcontroller. The microcontroller module is also electrically connected to a power supply module and a LIN communication module. The power supply module provides a stable voltage input for the microcontroller and various functional modules. The LIN communication module connects the microcontroller to the vehicle body LIN bus, receives signals sent by the microcontroller and transmits them to the LIN bus, and converts the LIN bus signals into signals that can be read by the microcontroller.

2. The automotive interior ambient lighting driving circuit according to claim 1, characterized in that: The LED module contains two LED beads, which are connected in series.

3. The automotive interior ambient lighting driving circuit according to claim 2, characterized in that: The power module includes a voltage regulator chip, a TVS diode, a diode, a resistor, a capacitor, and a ferrite bead. The power module is used to step down the vehicle body voltage from 12V to 5V for output.

4. The automotive interior ambient lighting driving circuit according to claim 1, characterized in that: The LIN communication module includes a LIN transceiver, resistors, capacitors, ferrite beads, and an ESD diode. The ESD diode D5 is used to protect the LIN transceiver from damage caused by external instantaneous spike pulse impacts.

5. The automotive interior ambient lighting driving circuit according to claim 1, characterized in that: The microcontroller module includes a microcontroller, a debugging interface, a crystal oscillator circuit, and a reset circuit. The debugging interface is used for downloading and debugging the microcontroller's program, the crystal oscillator circuit provides a clock signal to the microcontroller, and the reset circuit is used for initializing the microcontroller's internal circuitry.

6. The automotive interior ambient lighting driving circuit according to claim 1, characterized in that: The LED driver module includes a transistor, an N-MOS transistor, a resistor, and a capacitor, wherein the transistor is an NPN transistor.

Images