LED system based on hardwire control

Abstract

The utility model relates to a kind of LED system based on hard-wire control, belong to vehicle light control technical field.It include LED drive controller and lamp plate;LED drive controller includes MCU module, constant-current drive module, drive switch module and ADC module;Lamp plate includes LED drive module, temperature acquisition module, by the first LED lamp group driven by the LED drive module and by the second LED lamp group driven by the constant-current drive module;The control signal output end of MCU module is connected with the control signal input end hard line of constant-current drive module, and the fault detection end hard line of constant-current drive module is connected with the fault feedback signal output end of MCU module;The PWM signal output end of MCU module is connected with the PWM signal input end hard line of the LED drive module, and the GPIO end hard line of the MCU module is connected with the fault feedback signal output end of the LED drive module. Through hard-wire control, high-precision adjustment of single-channel LED brightness, derating processing and real-time monitoring of lamp bead fault state are realized.

Description

Technical Field

[0001] This utility model relates to the field of vehicle lighting control technology, and in particular to an LED system based on hard-wired control. Background Technology

[0002] In existing technologies, in lower-spec models, the CAN communication module between the LED driver controller and the lamp board is eliminated to reduce costs. Instead, the on / off state of the LEDs on the lamp board is directly controlled by the constant current switch and high-side drive switch of the LED driver controller.

[0003] First, existing hard-wired control schemes can only achieve single-function overall on / off control, and cannot precisely adjust the brightness of individual LED strings, thus making it difficult to support complex animation effects such as flowing lines, gradual brightening, and gradual dimming. Second, except for constant current architectures which can achieve dimming by adjusting the output current, LEDs under constant voltage or high-side power supply architectures cannot undergo current reduction processing, posing a risk of overheating and damage to the LED board hardware due to insufficient thermal management. Furthermore, because existing hard-wired schemes lack communication capabilities, they cannot read the register information of the LED driver chip, resulting in inaccurate detection of LED faults and their inability to report to the upstream vehicle lighting domain controller, leaving the LED board in an uncontrolled state and posing a significant safety hazard. Utility Model Content

[0004] The technical problem to be solved by this utility model is: in order to overcome the technical problems existing in the prior art, this utility model provides an LED system based on hard-wire control.

[0005] The technical solution adopted by this utility model to solve its technical problem is: This utility model provides an LED system based on hard-wired control, including an LED driver controller and a lamp board; The LED driver controller includes an MCU module, a constant current driver module, a driver switch module, and an ADC module; the lamp board includes an LED driver module, a temperature acquisition module, a first LED group driven by the LED driver module, and a second LED group driven by the constant current driver module. The control signal output terminal of the MCU module is hardwired to the control signal input terminal of the constant current drive module, and the fault feedback signal output terminal of the constant current drive module is hardwired to the fault detection terminal of the MCU module. The PWM signal output terminal of the MCU module is hardwired to the PWM signal input terminal of the LED driver module, and the fault feedback signal output terminal of the LED driver module is hardwired to the GPIO terminal of the MCU module. The switch control terminal of the MCU module is hardwired to the control input terminal of the drive switch module, and the power output terminal of the drive switch module is hardwired to the power input terminal of the LED driver module. The signal output terminal of the temperature acquisition module is hardwired to the signal input terminal of the ADC module, and the signal output terminal of the ADC module is hardwired to the signal acquisition terminal of the MCU module.

[0006] Furthermore, the constant current drive module includes a boost chip and a constant current buck chip.

[0007] Furthermore, the boost chip is a Boost chip, and the constant current buck chip is a BUCK CC chip; The enable terminal of the Boost chip is hardwired to the enable control terminal of the MCU module, and the power output terminal of the Boost chip is hardwired to the power input terminal of the BUCK CC chip. The current control terminal of the MCU module is hardwired to the dimming signal input terminal of the BUCK CC chip, and the fault feedback signal output terminal of the BUCK CC chip is hardwired to the fault detection terminal of the MCU module.

[0008] Furthermore, the drive switch module includes a high-side drive chip.

[0009] Furthermore, the LED driver module includes a TPS92624 chip.

[0010] Furthermore, the LED driver controller also includes an SBC module; The MCU module communicates with the vehicle lighting domain controller through the SBC module; The power output terminal of the SBC module is connected to the power input terminal of the MCU module. The watchdog signal terminal of the SBC module is connected to the watchdog reset terminal of the MCU module.

[0011] Furthermore, the LED driver controller also includes a power protection circuit; The input terminal of the power protection circuit is connected to the vehicle body power supply, and the output terminal of the power protection circuit is connected to the LED system power supply.

[0012] Furthermore, the temperature acquisition module includes a negative temperature coefficient thermistor.

[0013] Furthermore, the first LED light group includes turn signals, position lights, and daytime running lights.

[0014] Furthermore, the second LED light assembly includes high beams and low beams.

[0015] The beneficial effects of this utility model are: 1. An LED driver module with a fault feedback signal output terminal and a PWM signal input terminal is introduced into the LED system, which realizes high-precision control of the brightness of a single string of LED beads through hard-wired signals to support a variety of dynamic lighting effects.

[0016] 2. By hard-wired connection between the PWM signal output terminal of the MCU module and the PWM signal input terminal of the LED driver module, the derating control of the LED is realized through the brightness adjustment mechanism under the high-side power supply architecture. Under high temperature conditions, the output power of the lamp board can be automatically reduced to avoid hardware damage due to overheating.

[0017] 3. By real-time monitoring of the fault feedback signal output terminals of the constant current drive module and the LED drive module, real-time monitoring of the lamp bead fault status is achieved through hard-wired signals, ensuring that the system can respond in a timely manner when a fault occurs, keeping the lamp board in a safe and controllable state, thereby ensuring driving safety. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the LED system based on hard-wire control according to this utility model. Figure 2 This is a schematic diagram of the TPS92624 chip of this utility model; Figure 3 This is a flowchart illustrating how the second LED group is driven to light up normally via a constant current drive module according to this utility model. Figure 4 This is a flowchart illustrating how the first LED group is driven to light up normally by an LED driver module according to this utility model. Figure 5 This is a flowchart illustrating how a constant current drive module controls a lamp board to adjust brightness and derating according to the present invention. Figure 6 This is a flowchart illustrating the brightness adjustment and derating of a lamp board controlled by an LED driver module according to this utility model. Figure 7 This is a flowchart illustrating the fault detection process of the constant current drive module according to this utility model. Figure 8 This is a flowchart illustrating the fault detection process for the LED driver module according to this utility model. Detailed Implementation

[0020] Before discussing the exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe the operations as sequential processes, many of these operations can be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but may also have additional steps not included in the figures. The process can correspond to a method, function, procedure, subroutine, subroutine, etc.

[0021] It should be understood that although the terms "first," "second," etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are used merely to distinguish one unit from another. For example, without departing from the scope of the exemplary embodiments, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] The present invention will now be described in 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.

[0023] For ease of understanding, the overall concept of the present invention will be described before the detailed description of the embodiments thereof: This invention provides a hard-wired controlled LED system, aiming to solve the problems of traditional hard-wired controlled LED systems, such as the inability to precisely adjust the brightness of a single string of LEDs, the inability to perform current reduction, and the inability to detect faults. This invention introduces an LED driver module with a fault feedback signal output terminal and a PWM signal input terminal. The MCU module has GPIO terminals and PWM signal output terminals. The fault feedback signal output terminal is hard-wired connected to the GPIO terminal, and the PWM signal output terminal is hard-wired connected to the PWM signal input terminal. This enables LED current reduction and derating control via pure hard-wired signals, as well as real-time monitoring of LED fault status, even under a high-side power supply architecture. Furthermore, the LED driver module has multiple output channels, and each output channel has a corresponding PWM interface to control the duty cycle of each output current, thereby achieving brightness and power adjustment of a single string of LEDs and supporting various dynamic lighting effects.

[0024] Example 1 like Figure 1As shown, this embodiment provides an LED system based on hard-wired control, including an LED driver controller and a lamp board. The LED driver controller includes an MCU module, a constant current drive module, a drive switch module, an ADC module, an SBC module, and a power protection circuit; the lamp board includes an LED driver module, a temperature acquisition module, a first LED group driven by the LED driver module, and a second LED group driven by the constant current drive module.

[0025] In some feasible implementations, the input terminal of the power protection circuit is connected to the vehicle body power supply, and the output terminal of the power protection circuit is connected to the LED system power supply. The power protection circuit is used to provide anti-static protection, reverse connection protection, and filtering for the input vehicle body power supply, and outputs a clean and stable voltage to power the SBC module, constant current drive module, and drive switch module.

[0026] In some feasible implementations, the SBC module integrates a CAN transceiver, watchdog timer, and a 5V LDO module. These are used to enable CAN FD communication between the MCU module and the vehicle lighting domain controller, monitor the status of the MCU module, and provide power to the MCU module. The SBC module can use the TLE9263BQX chip, and the MCU module can use the S32K312 chip. The MCU module communicates with the vehicle lighting domain controller through the SBC module; the power output terminal of the SBC module is connected to the power input terminal of the MCU module; and the watchdog signal terminal of the SBC module is connected to the watchdog reset terminal of the MCU module.

[0027] In some feasible implementations, the constant current drive module includes a boost chip and a constant current buck chip. The boost chip outputs a constant voltage power supply to power the constant current buck chip, and the constant current buck chip outputs a constant current power supply to directly drive the second LED group. Specifically, the boost chip is preferably a Boost chip, which can be a TPS92682-Q1, and the constant current buck chip is preferably a BUCK CC chip, which can be a BD18398. The second LED group consists of LEDs with relatively high current, typically including high beams and low beams, and is directly driven by the BUCK CC chip (with a single-channel current limit of 1.5A).

[0028] It should be noted that the enable terminal of the Boost chip is hardwired to the enable control terminal of the MCU module, and the power output terminal of the Boost chip is hardwired to the power input terminal of the BUCK CC chip; the current control terminal of the MCU module is hardwired to the dimming signal input terminal of the BUCK CC chip, and the fault feedback signal output terminal of the BUCK CC chip is hardwired to the fault detection terminal of the MCU module.

[0029] In some feasible implementations, the drive switch module is preferably a high-side driver chip, used to output power to supply power to the LED driver module. The high-side driver chip can be a TPS2HB35. The switch control terminal of the MCU module is hardwired to the control input terminal of the drive switch module, and the power output terminal of the drive switch module is hardwired to the power input terminal of the LED driver module.

[0030] In some feasible implementations, combined with Figure 2 As shown, the LED driver module can use a TPS92624 chip to drive the first LED group. Each TPS92624 chip can output four constant current channels, with a single channel current limit of 150mA. The PWM signal output terminal of the MCU module is hardwired to the PWM signal input terminal of the LED driver module to adjust the current duty cycle of each output channel of the LED driver module. The fault feedback signal output terminal of the LED driver module is hardwired to the GPIO terminal of the MCU module. The GPIO terminal is an I / O port that supports digital level input / output and analog level input / output, used to monitor the fault status of the LED driver module. The first LED group consists of LEDs with relatively low current, typically including turn signals, position lights, and daytime running lights.

[0031] Specifically, Figure 2 The Fault pin of the TPS92624 chip is the fault feedback signal output terminal. The Fault pin of the TPS92624 chip is connected to the GPIO pin of the MCU module. The PWM pin of the TPS92624 chip is connected to the PWM pin of the MCU module. The SUPPLY pin of the TPS92624 chip is connected to the power output terminal of the high-side driver chip. The OUT pin of the TPS92624 chip is connected to the first LED group.

[0032] In some feasible implementations, the temperature acquisition module includes a negative temperature coefficient thermistor for acquiring the temperature of the lamp board; the ADC module is a digital-to-analog acquisition module used to convert the analog signal acquired by the temperature acquisition module into a digital signal and transmit it to the MCU module. Specifically, the signal output terminal of the temperature acquisition module is hardwired to the signal input terminal of the ADC module, and the signal output terminal of the ADC module is hardwired to the signal acquisition terminal of the MCU module.

[0033] like Figure 3 As shown, the process of driving the second LED group to light up normally through the constant current drive module is as follows: the SBC module receives the lighting signal sent by the vehicle lighting domain controller through the CAN transceiver; the SBC module forwards the lighting signal to the MCU module; the MCU module turns on the output of the BUCK CC chip according to the lighting signal, and the BUCK CC chip drives the second LED group to light up.

[0034] like Figure 4 As shown, the process of driving the first LED group to light up normally via the LED driver module is as follows: The SBC module receives the lighting signal sent by the vehicle lighting domain controller via its CAN transceiver; the SBC module forwards the lighting signal to the MCU module; the MCU module turns on the driver switch module to supply power to the LED driver module according to the lighting signal, and outputs a PWM signal according to the normal lighting current of the corresponding vehicle lighting function. The 100% output current of each channel of the TPS92624 chip is determined by the lamp board hardware, where PWM = actual output current / hardware setting current.

[0035] like Figure 5 As shown, the process of controlling the lamp board for brightness adjustment and derating through the constant current drive module is as follows: The MCU module receives the unlocking or locking animation or light signal animation sent by the vehicle lighting domain controller, or reads that the lamp board temperature is too high through the ADC module; the MCU module adjusts the output current of the BUCK CC chip to adjust the brightness of the lamp board. Since the accuracy of analog adjustment is not high when the output current is small, analog adjustment is used when the output current is above 100mA, and digital adjustment is used when the output current is below 100mA.

[0036] like Figure 6 As shown, the process of controlling the lamp board for brightness adjustment and derating through the LED driver module is as follows: The MCU module receives the unlocking or locking animation or light signal sent by the vehicle lighting domain controller, or reads that the lamp board temperature is too high through the ADC module; the MCU module controls the output current of the LED driver module through the PWM signal to adjust the brightness of the lamp board. Each TPS92624 chip has four output channels, and each channel has a corresponding PWM pin to control the duty cycle of the output current, thus achieving the purpose of adjusting the brightness and power of a single-channel LED.

[0037] like Figure 7 As shown, the fault detection process for the constant current drive module is as follows: When the MCU module reads a short circuit or open circuit fault in the BUCK CC chip, or detects an overvoltage in the output voltage of the BUCK CC chip, the MCU module controls the BUCK CC chip to turn off the output and turn it on again in the next lighting cycle; when the MCU module detects an undervoltage in the output voltage of the BUCK CC chip, it determines that the LED has a short circuit and handles it according to the function type of the load. For example, some load functions require all LEDs to be turned off when one LED is damaged, while other load functions require other LEDs to continue to light up after one LED is damaged.

[0038] like Figure 8As shown, the fault detection process for the LED driver module is as follows: When the GPIO terminal of the MCU module detects that the fault feedback signal output terminal of the TPS92624 chip has become low, the possible fault types are open circuit, overheating, and power supply undervoltage. The MCU module determines the function involved in the faulty LED and lights it according to the corresponding safety status. For example, if the turn signal fails, the corresponding output is turned off, and if the position light fails, it continues to light up at low brightness.

[0039] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, and are capable of applying conventional experimental methods prior to that date. They can improve and implement this solution based on the guidance provided in this application and their own capabilities. Typical known structures or methods should not hinder those skilled in the art from implementing this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims. The specific embodiments described in the specification can be used to interpret the content of the claims. All exemplary parameter values ​​in the algorithm of this application do not limit the technical solution of this utility model in any way. Those skilled in the art can make corresponding adjustments according to actual needs.

Claims

1. An LED system based on hard-wired control, characterized in that, Includes LED driver controller and light panel; The LED driver controller includes an MCU module, a constant current driver module, a driver switch module, and an ADC module; the lamp board includes an LED driver module, a temperature acquisition module, a first LED group driven by the LED driver module, and a second LED group driven by the constant current driver module. The control signal output terminal of the MCU module is hardwired to the control signal input terminal of the constant current drive module, and the fault feedback signal output terminal of the constant current drive module is hardwired to the fault detection terminal of the MCU module. The PWM signal output terminal of the MCU module is hardwired to the PWM signal input terminal of the LED driver module, and the fault feedback signal output terminal of the LED driver module is hardwired to the GPIO terminal of the MCU module. The switch control terminal of the MCU module is hardwired to the control input terminal of the drive switch module, and the power output terminal of the drive switch module is hardwired to the power input terminal of the LED driver module. The signal output terminal of the temperature acquisition module is hardwired to the signal input terminal of the ADC module, and the signal output terminal of the ADC module is hardwired to the signal acquisition terminal of the MCU module.

2. The LED system based on hard-wire control according to claim 1, characterized in that, The constant current drive module includes a boost chip and a constant current buck chip.

3. The LED system based on hard-wire control according to claim 2, characterized in that, The boost chip is a Boost chip, and the constant current buck chip is a BUCK CC chip; The enable terminal of the Boost chip is hardwired to the enable control terminal of the MCU module, and the power output terminal of the Boost chip is hardwired to the power input terminal of the BUCK CC chip. The current control terminal of the MCU module is hardwired to the dimming signal input terminal of the BUCK CC chip, and the fault feedback signal output terminal of the BUCK CC chip is hardwired to the fault detection terminal of the MCU module.

4. The LED system based on hard-wired control according to claim 1, characterized in that, The drive switch module includes a high-side drive chip.

5. The LED system based on hard-wired control according to claim 1, characterized in that, The LED driver module includes a TPS92624 chip.

6. The LED system based on hard-wired control according to claim 1, characterized in that, The LED driver controller also includes an SBC module; The MCU module communicates with the vehicle lighting domain controller through the SBC module; The power output terminal of the SBC module is connected to the power input terminal of the MCU module. The watchdog signal terminal of the SBC module is connected to the watchdog reset terminal of the MCU module.

7. The LED system based on hard-wired control according to claim 1, characterized in that, The LED driver controller also includes a power protection circuit. The input terminal of the power protection circuit is connected to the vehicle body power supply, and the output terminal of the power protection circuit is connected to the LED system power supply.

8. The LED system based on hard-wired control according to claim 1, characterized in that, The temperature acquisition module includes a negative temperature coefficient thermistor.

9. The LED system based on hard-wire control according to claim 1, characterized in that, The first LED light group includes turn signals, position lights, and daytime running lights.

10. The LED system based on hard-wired control according to claim 1, characterized in that, The second LED light group includes high beams and low beams.

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