Light source system and vehicle

Abstract

The utility model provides a light source system and a vehicle. The light source system comprises a control unit, a light source emitting unit and a temperature control assembly. The control unit comprises a main control circuit connected with the temperature control assembly. The light source emitting unit comprises a light source emitting circuit and a temperature detection circuit. The light source emission circuit is connected with the main control circuit, and the light source emission circuit responds to a control signal of the main control circuit and emits illumination light; the temperature detection circuit is connected with the main control circuit and is used for detecting the working temperature of the light source emission circuit and generating a variable temperature control signal based on the working temperature; the main control circuit responds to the variable temperature control signal to judge whether the working temperature is larger than a preset temperature threshold value or not, and when the working temperature is larger than the preset temperature threshold value, the main control circuit controls the temperature control assembly to work. In this way, the working stability and the working life of the light source system can be effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of light source systems of vehicles, in particular to a light source system and a vehicle. BACKGROUND

[0002] The light source system is also the headlamp system of the vehicle, and plays an important role in the safety of vehicle driving. However, the light source system in the existing vehicle still has the shortcomings of poor working stability and short service life. Therefore, how to improve the working stability and service life of the light source system is an urgent technical problem to be solved at present. CONTENT OF THE INVENTION

[0003] The present application provides a light source system for a vehicle, which comprises a control unit, a light source emitting unit and a temperature control assembly. The control unit comprises a main control circuit connected with the temperature control assembly. The light source emitting unit comprises a light source emitting circuit and a temperature detection circuit. The light source emitting circuit is connected with the main control circuit and emits illumination light in response to a control signal of the main control circuit. The temperature detection circuit is connected with the main control circuit and is used for detecting the working temperature of the light source emitting circuit and generating a temperature-dependent control signal based on the working temperature. The main control circuit judges whether the working temperature is greater than a preset temperature threshold in response to the temperature-dependent control signal, and controls the temperature control assembly to work when the working temperature is greater than the preset temperature threshold.

[0004] In some embodiments, the temperature detection circuit comprises a first resistor, which is a thermistor. The first signal end of the first resistor is connected to the ground, and the second signal end of the first resistor is connected with the first signal detection end of the main control circuit. The temperature-dependent control signal comprises an endpoint voltage signal at the second signal end of the first resistor. The second resistor has its first signal end connected with the second signal end of the first resistor, and its second signal end is used for connecting a detection voltage. The main control circuit is used for determining the working temperature based on the endpoint voltage signal and the detection voltage.

[0005] In some embodiments, the temperature control assembly comprises a switching circuit, whose first signal end is used for connecting a first working voltage, and whose control end is connected with the main control circuit. A heat dissipation fan is electrically connected with the second signal end of the switching circuit. The main control circuit controls the first signal end of the switching circuit to be conductive with the second signal end of the switching circuit to make the heat dissipation fan physically cool the light source emitting circuit based on the first working voltage in response to the working temperature being greater than the preset temperature threshold.

[0006] In some embodiments, the control unit further includes a boost circuit and a buck constant current circuit. The boost circuit includes: a first regulating circuit whose input terminal is used to connect to a power supply voltage; and a first processing circuit connected to the control terminal of the first regulating circuit and a main control circuit. The first processing circuit responds to a first control signal output by the main control circuit and controls the first regulating circuit to convert the power supply voltage into a second operating voltage. The buck constant current circuit includes: a second regulating circuit whose input terminal is connected to the output terminal of the first regulating circuit, and whose output terminal is connected to a light source emitting circuit; and a second processing circuit connected to the control terminal of the second regulating circuit and the main control circuit. The second processing circuit controls the second regulating circuit to output a constant current source based on a second control signal output by the main control circuit.

[0007] In some embodiments, the boost circuit further includes: a first acquisition circuit connected to the first processing circuit and the first adjustment circuit. The first acquisition circuit is used to acquire a first feedback signal of the first adjustment circuit. The first processing circuit is used to determine whether the first adjustment circuit is in an abnormal working state based on the first feedback signal, and to send a first communication message to the main control circuit when the first adjustment circuit is in an abnormal working state, so that the main control circuit can monitor and protect the first processing circuit and the first adjustment circuit based on the first communication message.

[0008] In some embodiments, the step-down constant current circuit further includes: a second acquisition circuit connected to the second processing circuit and the second adjustment circuit. The second acquisition circuit is used to acquire a second feedback signal of the second adjustment circuit. The second processing circuit is used to determine whether the second adjustment circuit is in an abnormal working state based on the second feedback signal, and to send a second communication message to the main control circuit when the second adjustment circuit is in an abnormal working state, so that the main control circuit can monitor and protect the second processing circuit and the second adjustment circuit based on the second communication message.

[0009] In some embodiments, the boost circuit further includes a first communication circuit, which is connected to the first processing circuit and communicates with the main control circuit. The first processing circuit is used to interact with the main control circuit via the first communication circuit based on the SPI communication protocol.

[0010] In some embodiments, the step-down constant current circuit further includes a second communication circuit, which is connected to a second processing circuit. The second processing circuit is used to interact with the main control circuit via the second communication circuit based on the SPI communication protocol.

[0011] In some embodiments, the light source emitting circuit includes: an LED bead circuit electrically connected to the output terminal of the second adjustment circuit for emitting illumination light; and a matrix control circuit connected to the LED bead circuit and communicatively connected to the main control circuit. The matrix control circuit is used to control the output terminals of the LED bead circuit and the second adjustment circuit to conduct based on a third control signal output by the main control circuit, so that the LED bead circuit emits illumination light.

[0012] In some embodiments, the control unit further includes: a third communication circuit connected to the main control circuit for communicating with the vehicle's infotainment system, wherein the main control circuit is used to interact with the vehicle's infotainment system via the third communication circuit in a differential transmission manner.

[0013] This application provides a vehicle that includes the light source system described in any of the above embodiments.

[0014] The beneficial effects of this application embodiment are as follows: In this application embodiment, a temperature detection circuit is provided in the light source emitting unit. The temperature detection circuit is used to detect the operating temperature of the light source emitting circuit and generate a variable temperature control signal based on the operating temperature. The main control circuit is a functional circuit or processing chip with logic processing capabilities. The main control circuit acquires the variable temperature control signal and obtains the operating temperature of the light source emitting circuit based on the variable temperature control signal. When the operating temperature is higher than a preset temperature threshold, the main control circuit controls the temperature control component to cool down the light source emitting circuit, so that the operating temperature of the light source emitting circuit is kept within the normal operating temperature range. This effectively reduces the probability of the light source emitting circuit being damaged due to excessively high operating temperature, thereby effectively improving the working life and working stability of the light source system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the circuit structure of an embodiment of the light source system of this application;

[0016] Figure 2 yes Figure 1 A schematic diagram of the circuit structure of an embodiment of the boost circuit in the light source system shown;

[0017] Figure 3 yes Figure 1 The circuit structure diagram of an embodiment of the step-down constant current circuit in the light source system shown is illustrated. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] The terms "first" and "second" in this application are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise expressly specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or apparatus.

[0020] like Figure 1 As shown, a light source system 10 for a vehicle includes a control unit 100, a light source emitting unit 200, and a temperature control component (not shown). The control unit 100 includes a main control circuit 110 connected to the temperature control component. The light source emitting unit 200 includes a light source emitting circuit 210 and a temperature detection circuit 220. The light source emitting circuit 210 is connected to the main control circuit 110 and emits illumination light in response to a control signal from the main control circuit 110. The temperature detection circuit 220 is connected to the main control circuit 110 and is used to detect the operating temperature of the light source emitting circuit 210 and generate a variable temperature control signal based on the operating temperature. The main control circuit 110 determines whether the operating temperature is greater than a preset temperature threshold in response to the variable temperature control signal, and controls the temperature control component to operate when the operating temperature is greater than the preset temperature threshold.

[0021] Specifically, in this embodiment, the control unit 100 is the control integration unit of the light source system 10. It controls the light source emitting circuit 210 of the light source emitting unit 200 to emit illumination light, and uses the variable temperature control signal fed back by the temperature detection circuit 220 to control the temperature of the light-emitting unit. Within the light source emitting unit 200, the light source emitting circuit 210 generates a large amount of heat during operation. If the temperature is too high, the operational stability of the light source emitting circuit 210 will be affected, and it may even increase the probability of the light source emitting circuit 210 being burned out, thereby affecting the service life of the light source system 10. Therefore, in this embodiment, a temperature detection circuit 220 is provided within the light source emitting unit 200. The temperature detection circuit 220 is used to detect the operating temperature of the light source emitting circuit 210 and generate a variable temperature control signal based on the operating temperature. The main control circuit 110 is a functional circuit or processing chip, etc., with logic processing capabilities. The main control circuit 110 acquires the variable temperature control signal and obtains the operating temperature of the light source emitting circuit 210 based on the variable temperature control signal. When the operating temperature is higher than the preset temperature threshold, the main control circuit 110 controls the temperature control component to cool down the light source emitting circuit 210 so that the operating temperature of the light source emitting circuit 210 is kept within the normal operating temperature range. This effectively reduces the probability of the light source emitting circuit 210 being damaged due to excessive operating temperature, thereby effectively improving the working life and working stability of the light source system 10.

[0022] The preset temperature threshold can be selected according to the actual operating conditions of the light source system 10, which will not be elaborated on here.

[0023] like Figure 1 As shown, in some embodiments, the temperature detection circuit 220 includes a first resistor R6 and a second resistor R7. The first resistor R6 is a thermistor, and its resistance value changes with the operating temperature. The first signal terminal of the first resistor R6 is grounded, and its second signal terminal is connected to the first signal detection terminal of the main control circuit 110. The first signal terminal of the second resistor R7 is connected to the second signal terminal of the first resistor R6, and its second signal terminal is used to input a detection voltage.

[0024] Specifically, the variable temperature control signal includes the endpoint voltage signal at the second signal terminal of the first resistor R6. The main control circuit 110 is used to determine the operating temperature based on the endpoint voltage signal and the detection voltage. For example, the main control circuit 110 can calculate the current value in the temperature detection circuit 220 based on the difference between the endpoint voltage signal and the detection voltage, and calculate the resistance value of the first resistor R6 based on the current value and the endpoint voltage signal. After obtaining the resistance value of the first resistor R6, the main control circuit 110 can determine the operating temperature of the light source emitting circuit 210 based on the mapping table between the resistance value and the operating temperature, thereby determining whether the operating temperature is greater than the preset temperature threshold, and then cooperating with the temperature control component to control the temperature of the light source emitting circuit 210.

[0025] Optionally, such as Figure 1 As shown, the detection voltage can be provided by the light source emitting circuit 210, or in some embodiments, the detection voltage can also be provided by the power supply of the main control circuit 110, which will not be described in detail here.

[0026] In some embodiments, the temperature control component includes a switching circuit 300 and a cooling fan (not shown). A first signal terminal of the switching circuit 300 is used to connect to a first operating voltage, and a control terminal of the switching circuit 300 is connected to a main control circuit 110. The cooling fan is electrically connected to a second signal terminal of the switching circuit 300. When the operating temperature exceeds a preset temperature threshold, the main control circuit 110 controls the first and second signal terminals of the switching circuit 300 to conduct, so that the cooling fan physically cools the light source emitting circuit 210 based on the first operating voltage. The model of the cooling fan can be customized according to actual needs, which will not be detailed here.

[0027] Optionally, in some embodiments, the temperature control component includes a switching circuit 300, a drive pump, and a flow guide pipe integrated into the light source emitting unit 200. The flow guide pipe is used to connect to coolant. The first signal terminal of the switching circuit 300 is used to connect to a first operating voltage. The control terminal of the switching circuit 300 is connected to the main control circuit 110. The second signal terminal of the switching circuit 300 is electrically connected to the drive pump. Based on a response to the operating temperature exceeding a preset temperature threshold, the main control circuit 110 controls the first and second signal terminals of the switching circuit 300 to conduct, causing the drive pump to drive the coolant flow in the flow guide pipe. This allows the coolant to flow to various circuit regions of the light source emitting circuit 210 under the guidance of the flow guide pipe, thereby cooling the light source emitting circuit 210.

[0028] like Figure 1 , Figure 2 and Figure 3As shown, in some embodiments, the control unit 100 further includes a boost circuit 120 and a buck constant current circuit 130. The boost circuit 120 includes a first adjustment circuit (not shown) and a first processing circuit 121. The buck constant current circuit 130 includes a second adjustment circuit (not shown) and a second processing circuit 131. The input terminal of the first adjustment circuit is connected to the power supply voltage V1; the input terminal of the second adjustment circuit is connected to the output terminal of the first adjustment circuit; the output terminal of the second adjustment circuit is connected to the light source emitting circuit 210; the second processing circuit 131 is connected to the control terminal of the second adjustment circuit and the main control circuit 110; and the first processing circuit 121 is connected to the control terminal of the first adjustment circuit and the main control circuit 110. The first processing circuit 121 responds to the first control signal output by the main control circuit 110 and controls the first adjustment circuit to convert the power supply voltage V1 into the second operating voltage V2. The second processing circuit 131 controls the second adjustment circuit to output a constant current source V3 based on the second control signal output by the main control circuit 110, so that the light source emitting circuit 210 can work stably based on the constant current source V3.

[0029] Optionally, such as Figure 2 As shown, in some embodiments, the first adjustment circuit includes a switching transistor G1, an inductor L1, a diode J1, a capacitor C1, a capacitor C2, a resistor R1, and a first driving circuit 125. The first signal terminal of the inductor L1 serves as the input terminal of the first adjustment circuit, connected to a power supply voltage V1. The second signal terminal of the inductor L1 is connected to the first signal terminal of the switching transistor G1 and the first signal terminal of the capacitor C1, with the second signal terminal of the capacitor C1 grounded. The second signal terminal of the switching transistor G1 is connected to the first signal terminal of the resistor R1, with the second signal terminal of the resistor R1 grounded. The control terminal of the switching transistor G1 is connected to the first driving circuit 125, and the control terminal of the first driving circuit 125 serves as the control terminal of the first adjustment circuit and is connected to the main control circuit 110. The first signal terminal of the diode J1 is connected to the second signal terminal of the inductor L1, and the second signal terminal of the diode J1 serves as the output terminal of the first adjustment circuit and is connected to the input terminal of the second adjustment circuit. The first signal terminal of the capacitor C2 is connected to the second signal terminal of the diode J1, with the second signal terminal of the capacitor C2 grounded. The switching transistor G1, inductor L1, diode J1, capacitor C1, capacitor C2, resistor R1, and the first driving circuit 125 are connected in the above-described manner to form the first regulating circuit.

[0030] The first driving circuit 125 drives the switching transistor G1 to turn on and off based on the first control signal output by the main control circuit 110, so that the first regulating circuit can boost the power supply voltage V1 to adjust the power supply voltage V1 to the second working voltage V2.

[0031] like Figure 2As shown, in some embodiments, the boost circuit 120 further includes a first acquisition circuit 127. The first acquisition circuit 127 is connected to the first processing circuit 121 and the first adjustment circuit. The first acquisition circuit 127 is used to acquire a first feedback signal from the first adjustment circuit. The first processing circuit 121 is used to determine whether the first adjustment circuit is in an abnormal working state based on the first feedback signal, and when the first adjustment circuit is in an abnormal working state, it sends a first communication message to the main control circuit 110 so that the main control circuit 110 monitors and protects the first processing circuit 121 and the first adjustment circuit based on the first communication message.

[0032] Specifically, the first processing circuit 121 determines whether the first regulating circuit is in an abnormal operating state based on the first feedback signal. For example, it determines whether the first regulating circuit is in an overcurrent state (i.e., the current output by the first regulating circuit exceeds a preset current threshold), an overvoltage state (i.e., the second operating voltage output by the first regulating circuit is less than a preset voltage threshold), an undervoltage state (i.e., the second operating voltage output by the first regulating circuit is greater than a preset voltage threshold), or an output short-circuit grounding state (i.e., the output terminal of the first regulating circuit is short-circuited to ground). The first feedback signal includes the current feedback signal of the first regulating circuit and the voltage feedback signal output by the first regulating circuit. The first processing circuit 121 determines whether the first regulating circuit is in an overcurrent state based on the current feedback signal in the first feedback signal, and determines whether the first regulating circuit is in an overvoltage state, an undervoltage state, or an output short-circuit ground state based on the voltage feedback signal in the first feedback signal. The first processing circuit 121 sends a first communication message containing the judgment result to the main control circuit 110. The main control circuit 110 obtains the judgment result based on the first communication message, and protects the boost circuit 120 when the first regulating circuit is in any of the abnormal working states of overcurrent state, overvoltage state, undervoltage state, or output short-circuit ground state. This protects the boost circuit 120, the buck constant current circuit 130 located after the boost circuit 120, and the light source emitting circuit 210, thereby effectively improving the working stability and safety of the light source system 10 and effectively extending the working life of the light source system 10. For example, when the first regulating circuit is in an overcurrent state, the main control circuit 110 controls the first processing circuit 121 to stop working, so that the first regulating circuit stops working, thereby protecting the boost circuit 120, the buck constant current circuit 130 located at the rear end of the boost circuit 120 and the light source emission circuit 210, thereby effectively improving the working stability and safety of the light source system 10, and effectively extending the working life of the light source system 10.

[0033] Optionally, such as Figure 2As shown, the first acquisition circuit 127 includes an over / under voltage acquisition circuit 126 and an overcurrent acquisition circuit 122. The first signal terminal of the overcurrent acquisition circuit 122 is connected to the second signal terminal of the switching transistor G1, the second signal terminal of the overcurrent acquisition circuit 122 is connected to the second signal terminal of the resistor R1, and the third signal terminal of the overcurrent acquisition circuit 122 is connected to the first processing circuit 121. The first processing circuit 121 is used to obtain the current feedback signal of the first regulating circuit based on the voltage signal at the second signal terminal of the switching transistor G1 and the voltage signal at the second signal terminal of the resistor R1. The over / under voltage acquisition circuit 126 includes resistors R2 and R3. The first signal terminal of resistor R2 is connected to the second signal terminal of the inductor L1, the second signal terminal of resistor R2 is connected to the first signal terminal of resistor R3, and the second signal terminal of resistor R3 is grounded. The first processing circuit 121 is connected to the second signal terminal of resistor R2, thus the first processing circuit 121 can obtain the voltage feedback signal output by the first regulating circuit.

[0034] Optionally, such as Figure 2 As shown, in some embodiments, the boost circuit 120 further includes a first over-temperature protection circuit 124, wherein the first over-temperature protection circuit 124 is connected to the first processing circuit 121 and is used to detect the temperature information of the first processing circuit 121 and the first regulating circuit. The first processing circuit 121 determines whether the first processing circuit 121 and the first regulating circuit are in an over-temperature state based on the temperature signal obtained by the first over-temperature protection circuit 124. If the first processing circuit 121 and the first regulating circuit are in an over-temperature state, the first processing circuit 121 feeds back the over-temperature state information to the main control circuit 110 and enters the over-temperature protection state.

[0035] Optionally, such as Figure 2 As shown, in some embodiments, the boost circuit 120 further includes a first communication circuit 123, which is connected to the first processing circuit 121 and communicates with the main control circuit 110. The first processing circuit 121 is used to interact with the main control circuit 110 via the first communication circuit 123 based on the SPI communication protocol.

[0036] Specifically, the first communication circuit 123 is an SPI communication circuit (Serial Peripheral interface), which features fast and stable communication. The signal interaction between the first processing circuit 121 and the main control circuit 110 includes control signals (e.g., the first control signal) and the first communication message. By setting the signal interaction mode between the first processing circuit 121 and the main control circuit 110 to be based on the SPI communication protocol, the signal interaction speed between the first processing circuit 121 and the main control circuit 110 can be effectively improved. This allows the main control circuit 110 to obtain the first communication message more quickly and confirm the working status of the boost circuit 120, thereby controlling and protecting the boost circuit 120 and effectively improving the working stability of the boost circuit 120.

[0037] If the main control circuit 110 cannot establish a communication connection with the first processing circuit 121 through the first communication circuit 123, the main control circuit 110 determines that the first processing circuit 121 is in a communication failure state and reports it to the vehicle's in-vehicle infotainment system.

[0038] Optionally, such as Figure 3 As shown, in some embodiments, the second adjustment circuit includes a switching transistor G2, a diode J2, an inductor L2, a capacitor C3, a capacitor C4, a resistor R4, a resistor R5, and a second drive circuit 135. The first signal terminal of the switching transistor G2 serves as the input terminal of the second adjustment circuit and is connected to the output terminal of the first adjustment circuit. The second signal terminal of the switching transistor G2 is connected to the first signal terminal of the diode J2. The control terminal of the switching transistor G2 is connected to the second drive circuit 135, and the second drive circuit 135 is connected to the second processing circuit 131. The first signal terminal of the inductor L2 is connected to the second signal terminal of the switching transistor G2, and the second signal terminal of the inductor L2 is connected to the first signal terminal of the resistor R4. The first signal terminal of the capacitor C3 is connected to the second signal terminal of the inductor L2, and the second signal terminal of the capacitor C3 is connected to the second signal terminal of the resistor R4. The second signal terminal of the resistor R4 serves as the output terminal of the second adjustment circuit and is connected to the light source circuit. The first signal terminal of the capacitor C4 is connected to the power input terminal of the second drive circuit 135, and the second signal terminal of the capacitor C4 is connected to the first signal terminal of the resistor R5. The second signal terminal of the resistor R5 is connected to the second signal terminal of the switching transistor G2. Thus, the capacitor C4 and the resistor R5 form the bootstrap circuit of the first adjustment circuit to ensure that the second drive circuit 135 can smoothly turn on the switching transistor G2. The switching transistor G2, diode J2, inductor L2, capacitor C3, capacitor C4, resistor R4, resistor R5, and the second driving circuit 135 are connected in the above-described manner to form the second adjustment circuit.

[0039] The second driving circuit 135 drives the switching transistor G2 to turn on and off based on the second control signal output by the main control circuit 110, so that the second regulating circuit first reduces the voltage of the second working voltage V2 and then outputs the constant current source V3 to power the light source emitting circuit 210.

[0040] like Figure 3 As shown, in some embodiments, the step-down constant current circuit 130 further includes a second acquisition circuit 132. The second acquisition circuit 132 is connected to the second processing circuit 131 and the second adjustment circuit. The second acquisition circuit 132 is used to acquire a second feedback signal from the second adjustment circuit. The second processing circuit 131 is used to determine whether the second adjustment circuit is in an abnormal working state based on the second feedback signal, and when the second adjustment circuit is in an abnormal working state, it sends a second communication message to the main control circuit 110 so that the main control circuit 110 monitors and protects the second processing circuit 131 and the second adjustment circuit based on the second communication message.

[0041] Specifically, the second processing circuit 131 determines whether the second adjustment circuit is in an abnormal working state based on the second feedback signal. The abnormal working states include overcurrent state (i.e., the constant current source V3 output by the second adjustment circuit exceeds the preset current threshold), overvoltage state (i.e., the output voltage of the output terminal of the second adjustment circuit is less than the preset voltage threshold), undervoltage state (i.e., the output voltage of the output terminal of the second adjustment circuit is greater than the preset voltage threshold), output short circuit to ground state (i.e., the output terminal of the second adjustment circuit is short-circuited to ground), and whether the LED lamp bead circuit 201 of the light source emitting circuit 210 is in an open circuit state.

[0042] The second feedback signal includes the first feedback voltage signal at the first signal terminal of resistor R4, the second feedback voltage signal at the second signal terminal of resistor R4, and the duty cycle feedback signal of switch G2. The first detection terminal of the second acquisition circuit 132 is connected to the first signal terminal of resistor R4 to obtain the first feedback voltage signal, and the second detection terminal of the second acquisition circuit 132 is connected to the second signal terminal of resistor R4 to obtain the second feedback voltage signal. The second processing circuit 131 obtains the duty cycle feedback information of switch G2. Based on the second feedback voltage signal, the second processing circuit 131 determines whether the second regulation circuit is in an overvoltage state, an undervoltage state, or an output short-circuit ground state; based on the second feedback voltage signal and the duty cycle feedback signal, it determines whether the LED lamp bead circuit 201 is in an open-circuit state; and based on the first and second feedback voltage signals, it detects whether the second regulation circuit is in an overcurrent state. For example, the second processing circuit 131 determines that the voltage output by the second regulation circuit to the LED lamp bead circuit 201 is the input voltage based on the second feedback voltage signal, and determines that the LED lamp bead circuit 201 is in an open-circuit state based on the duty cycle feedback signal being 100%.

[0043] The second processing circuit 131 sends a second communication message containing the judgment result to the main control circuit 110. The main control circuit 110 obtains the judgment result based on the second communication message and protects the step-down constant current circuit 130 when the second adjustment circuit is in an abnormal working state (including any abnormal working state among overcurrent state, overvoltage state, undervoltage state, and output short circuit to ground state) or when the LED lamp bead circuit 201 is in an open circuit state. This protects the step-down constant current circuit 130 and the light source emitting circuit 210 located at the downstream end of the step-down constant current circuit 130, thereby effectively improving the working stability and safety of the light source system 10 and effectively extending the working life of the light source system 10.

[0044] For example, when the second regulating circuit is in an overcurrent state, the main control circuit 110 controls the second processing circuit 131 to stop working, so that the second regulating circuit stops working, thereby protecting the step-down constant current circuit 130 and the light source emitting circuit 210 located at the back end of the step-down constant current circuit 130, thereby effectively improving the working stability and safety of the light source system 10, and effectively extending the working life of the light source system 10.

[0045] Optionally, such as Figure 3 As shown, in some embodiments, the step-down constant current circuit 130 further includes a second over-temperature protection circuit 134, wherein the second over-temperature protection circuit 134 is connected to the second processing circuit 131 and is used to detect the temperature information of the second processing circuit 131 and the second regulating circuit. The second processing circuit 131 determines whether the second processing circuit 131 and the second regulating circuit are in an over-temperature state based on the temperature signal obtained by the second over-temperature protection circuit 134. If the second processing circuit 131 and the second regulating circuit are in an over-temperature state, the second processing circuit 131 feeds back the over-temperature state information to the main control circuit 110 and enters the over-temperature protection state.

[0046] Optionally, such as Figure 3 As shown, in some embodiments, the step-down constant current circuit 130 further includes a second communication circuit 133, which is connected to the second processing circuit 131 and communicates with the main control circuit 110. The second processing circuit 131 is used to interact with the main control circuit 110 via the second communication circuit 133 based on the SPI communication protocol.

[0047] Specifically, the second communication circuit 133 is an SPI communication circuit, which features fast and stable communication. The signal interaction between the second processing circuit 131 and the main control circuit 110 includes control signals (e.g., the second control signal) and the second communication message. Thus, setting the signal interaction mode between the second processing circuit 131 and the main control circuit 110 to an SPI communication protocol-based interaction mode can effectively improve the signal interaction speed between the second processing circuit 131 and the main control circuit 110. This allows the main control circuit 110 to obtain the second communication message more quickly and confirm the working status of the buck constant current circuit and the light source emitting circuit 210. Consequently, it can manage and protect the buck constant current circuit 130 and the light source emitting circuit 210, thereby effectively improving the working stability of the buck constant current circuit 130 and the light source emitting circuit 210.

[0048] If the main control circuit 110 cannot establish a communication connection with the second processing circuit 131 through the second communication circuit 133, the main control circuit 110 determines that the second processing circuit 131 is in a communication failure state and reports it to the vehicle's in-vehicle infotainment system.

[0049] like Figure 1 As shown, in some embodiments, the light source emitting circuit 210 includes an LED lamp bead circuit 201 and a matrix control circuit 202. The LED lamp bead circuit 201 is electrically connected to the output terminal of the second adjustment circuit and is used to emit illumination light. The matrix control circuit 202 is connected to the lamp bead circuit and is communicatively connected to the main control circuit 110. The matrix control circuit 202 is used to control the output terminals of the LED lamp bead circuit 201 and the second adjustment circuit to conduct based on a third control signal output by the main control circuit 110, so that the LED lamp bead circuit 201 emits illumination light.

[0050] Specifically, the light source emitting circuit 210 further includes a fourth communication circuit 203 connected to the matrix control circuit 202, and the control unit 100 includes a fifth communication circuit 140 connected to the main control circuit 110. The main control circuit 110 and the matrix control circuit 202 are connected via the fourth communication circuit 203 and the fifth communication circuit 140 for communication interaction. The output terminal of the second adjustment circuit is connected to the LED bead circuit 201, providing a constant current source V3 to drive the LED bead circuit 201 to emit illumination light. The main control circuit 110 sends a third control signal to the matrix control circuit 202, causing the matrix control circuit 202 to control the LED bead circuit 201 to conduct through the output terminal of the second adjustment circuit, thereby enabling the LED bead circuit 201 to emit illumination light. The LED bead circuit 201 includes multiple LED beads, each of which can be individually controlled by the matrix control circuit 202 to emit illumination light independently.

[0051] The matrix control circuit 202 is also used to feed back fault information of the LED lamp bead circuit 201 to the main control circuit 110, such as fault information related to open circuit, short circuit, and overheating of the LED lamp beads, so that the main control circuit 110 can perform real-time control of the light source emitting circuit 210. If the main control circuit 110 cannot communicate with the matrix control circuit 202 through the fourth communication circuit 203 and the fifth communication circuit 140, the main control circuit 110 determines that the matrix control circuit 202 is in a communication failure state and reports this to the vehicle infotainment system.

[0052] Optionally, both the fourth communication circuit 203 and the fifth communication circuit 140 are communication circuits based on the CAN (Controller Area Network) communication protocol.

[0053] like Figure 1 As shown, in some embodiments, the control unit 100 further includes a power supply circuit 160. The power supply circuit 160 is electrically connected to the main control circuit 110, the first processing circuit 121, and the second processing circuit 131, and is used to convert the battery voltage V4 into a stable operating power supply to power the logic processing circuits of the main control circuit 110, the first processing circuit 121, and the second processing circuit 131. The main control circuit 110 is also used to perform fault diagnosis on the operating power supply output by the main control circuit 110 to determine whether the operating power supply is in an overvoltage or undervoltage state.

[0054] like Figure 1 As shown, in some embodiments, the control unit 100 further includes a third communication circuit 150. The third communication circuit 150 is connected to the main control circuit 110 and is used to communicate with the vehicle's infotainment system. The main control circuit 110 is used to exchange signals with the vehicle's infotainment system via the third communication circuit 150 in a differential transmission manner.

[0055] Specifically, the third communication circuit 150 is a CAN-FD (Controller Area Network-Flexible Data Rate) communication circuit. This circuit converts the communication signal output from the main control circuit 110 to the vehicle infotainment system into a differential signal before sending it to the vehicle infotainment system. Because the distance between the vehicle infotainment system and the light source system 10 is too long, the third communication circuit 150 converts the communication signal into a differential signal before sending it to the vehicle infotainment system, effectively improving the communication stability between the main control circuit 110 and the vehicle infotainment system. The main control circuit 110, after communicating with the vehicle system via the third communication circuit 150, will provide real-time feedback to the vehicle system on the following abnormal diagnostic information: abnormal diagnostic information of the boost circuit 120 (e.g., judgment results and over-temperature status contained in the first communication message); abnormal diagnostic information of the buck constant current circuit 130 (e.g., judgment results and over-temperature status contained in the second communication message); abnormal diagnostic information of the light source emitting circuit 210 (including abnormal diagnostic information of the matrix control circuit 202 and the LED lamp bead circuit 201); and fault diagnostic information of the power supply circuit 160 (including undervoltage and overvoltage diagnostic information of the operating power supply). Therefore, when the light source system 10 malfunctions, the main control circuit 110 can promptly provide fault information to the vehicle system, enabling the vehicle system to perform timely fault diagnosis and provide feedback to the driver, thereby effectively improving vehicle driving safety.

[0056] This application provides a vehicle that includes the light source system 10 described in any of the above embodiments.

[0057] It is worth noting that the accompanying drawings are only for illustrating the structural and connection relationships of the product of this utility model, and do not limit the specific structural dimensions of the product of this utility model.

[0058] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A light source system, characterized in that, For use in vehicles, the light source system includes: The control unit comprises a light source emitting unit and a temperature control component; the control unit includes a main control circuit connected to the temperature control component, and the light source emitting unit includes: A light source emitting circuit is connected to the main control circuit. The light source emitting circuit emits illumination light in response to the control signal of the main control circuit. A temperature detection circuit, connected to the main control circuit, is used to detect the operating temperature of the light source emitting circuit and generate a variable temperature control signal based on the operating temperature. The main control circuit responds to the variable temperature control signal to determine whether the operating temperature is greater than a preset temperature threshold, and controls the temperature control component to operate when the operating temperature is greater than the preset temperature threshold. The control unit further includes: The boost circuit includes: The first regulating circuit has its input terminal connected to the power supply voltage; A first processing circuit is connected to the control terminal of the first regulating circuit and the main control circuit. The first processing circuit responds to the first control signal output by the main control circuit and controls the first regulating circuit to convert the power supply voltage into a second operating voltage. The step-down constant current circuit includes: The second adjustment circuit has its input terminal connected to the output terminal of the first adjustment circuit, and its output terminal is connected to the light source emitting circuit. The second processing circuit is connected to the control terminal of the second adjustment circuit and the main control circuit. The second processing circuit is used to control the output constant current source of the second adjustment circuit based on the second control signal output by the main control circuit.

2. The light source system according to claim 1, characterized in that, The temperature detection circuit includes: The first resistor is a thermistor. The first signal terminal of the first resistor is grounded. The second signal terminal of the first resistor is connected to the first signal detection terminal of the main control circuit. The variable temperature control signal includes the terminal voltage signal at the second signal terminal of the first resistor. The second resistor has its first signal terminal connected to the second signal terminal of the first resistor. The second signal terminal of the second resistor is used to receive the detection voltage. The main control circuit is used to determine the operating temperature based on the terminal voltage signal and the detection voltage.

3. The light source system according to claim 1, characterized in that, The temperature control component includes: A switching circuit, wherein the first signal terminal is used to connect to the first operating voltage, and the control terminal of the switching circuit is connected to the main control circuit; A cooling fan is electrically connected to the second signal terminal of the switching circuit. When the operating temperature exceeds a preset temperature threshold, the main control circuit controls the first signal terminal of the switching circuit to conduct with the second signal terminal of the switching circuit, so that the cooling fan physically cools the light source emitting circuit based on the first operating voltage.

4. The light source system according to claim 1, characterized in that, The boost circuit also includes: The first acquisition circuit is connected to the first processing circuit and the first adjustment circuit. The first acquisition circuit is used to acquire the first feedback signal of the first adjustment circuit. The first processing circuit is used to determine whether the first adjustment circuit is in an abnormal working state based on the first feedback signal, and to send a first communication message to the main control circuit when the first adjustment circuit is in an abnormal working state, so that the main control circuit can monitor and protect the first processing circuit and the first adjustment circuit based on the first communication message.

5. The light source system according to claim 1, characterized in that, The step-down constant current circuit also includes: The second acquisition circuit is connected to the second processing circuit and the second adjustment circuit. The second acquisition circuit is used to acquire the second feedback signal of the second adjustment circuit. The second processing circuit is used to determine whether the second adjustment circuit is in an abnormal working state based on the second feedback signal, and to send a second communication message to the main control circuit when the second adjustment circuit is in an abnormal working state, so that the main control circuit can monitor and protect the second processing circuit and the second adjustment circuit based on the second communication message.

6. The light source system according to any one of claims 1, 4, and 5, characterized in that, The boost circuit further includes a first communication circuit, which is connected to the first processing circuit and communicates with the main control circuit. The first processing circuit is used to interact with the main control circuit via the first communication circuit based on the SPI communication protocol.

7. The light source system according to any one of claims 1, 4, and 5, characterized in that, The step-down constant current circuit also includes a second communication circuit, which is connected to the second processing circuit. The second processing circuit is used to interact with the main control circuit via the second communication circuit based on the SPI communication protocol.

8. The light source system according to claim 1, characterized in that, The light source emitting circuit includes: The LED lamp bead circuit is electrically connected to the output terminal of the second adjustment circuit and is used to emit lighting light. A matrix control circuit is connected to the LED bead circuit and communicates with the main control circuit. The matrix control circuit is used to control the output terminals of the LED bead circuit and the second adjustment circuit to conduct based on the third control signal output by the main control circuit, so that the LED bead circuit emits illumination light.

9. The light source system according to claim 1, characterized in that, The control unit further includes: The third communication circuit is connected to the main control circuit and is used to communicate with the vehicle's infotainment system. The main control circuit is used to exchange signals with the vehicle's infotainment system via the third communication circuit in a differential transmission mode.

10. A vehicle, characterized in that, Includes the light source system according to any one of claims 1-9.

Images