Control circuit for vehicle key light
By combining the power supply, LED driver circuit, status display circuit, and switch control circuit, the problem of insufficient brightness and uniformity of vehicle button lights was solved, and the stability and controllability of vehicle button lights were improved, thus enhancing the user experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FULSCIENCE AUTOMOTIVE ELECTRONICS CO LTD
- Filing Date
- 2025-05-07
- Publication Date
- 2026-05-26
Smart Images
Figure CN224290122U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vehicle display technology, and in particular to a control circuit for vehicle button lights. Background Technology
[0002] Physical or touch buttons in vehicles typically use an LED light and an additional lampshade to achieve their lighting effects. This makes it difficult for the characters on the vehicle buttons to meet the basic requirements for brightness and uniformity, especially when the characters are large, thus reducing the brightness and uniformity of the vehicle button characters.
[0003] Currently, the control circuits for vehicle button lights generally control the on and off states of LED lights directly through on / off switches. Furthermore, they cannot detect and display the on / off status of LED lights in real time, making it impossible to determine the fault situation when the switch is closed and the LED lights fail to light up. This reduces the stability and controllability of vehicle button lights, thereby diminishing the user experience when using vehicle buttons. Utility Model Content
[0004] In view of this, the purpose of this utility model is to provide a control circuit for vehicle button lights. The circuit receives externally input switch control signals through a switch control circuit and controls the switching state of the LED driver circuit. When the switch is closed, the LED driver circuit uses the power output provided by the power supply to provide a light source for the vehicle buttons, which improves the brightness and uniformity of the vehicle button characters. The switching state of the LED driver circuit is displayed through a status display circuit, which improves the stability and controllability of the vehicle button lights, thereby enhancing the user experience of using the vehicle buttons.
[0005] This application embodiment provides a control circuit for vehicle button lights, the control circuit including a power supply, an LED driver circuit, a status display circuit, and a switch control circuit:
[0006] The power supply is connected to the LED driving circuit; the LED driving circuit is connected to the status display circuit; the status display circuit is connected to the switch control circuit.
[0007] The power supply provides power output to the LED driving circuit, the status display circuit, and the switch control circuit respectively; the switch control circuit receives externally input switch control signals and controls the switching state of the LED driving circuit according to the switch control signals; when the switch state is closed, the LED driving circuit emits light using the power output provided by the power supply to provide a light source for the target vehicle button installed above the LED driving circuit; the status display circuit displays the switching state of the LED driving circuit.
[0008] Furthermore, the power supply includes a DC power supply and a power switch:
[0009] The first terminal of the DC power supply is connected to the first terminal of the power supply switch; the second terminal of the power supply switch is connected to the first terminal of the LED driver circuit.
[0010] The DC power supply is used to provide power output to the LED driving circuit, the status display circuit, and the switch control circuit respectively; the power supply switch is used to control the on and off of the DC power supply.
[0011] Furthermore, the LED driving circuit includes a first LED and a second LED:
[0012] The first end of the first LED is connected to the first end of the power supply; the second end of the first LED is connected to the first end of the status display circuit; the second LED is connected in parallel with the first LED.
[0013] Both the first LED and the second LED serve as light-emitting loads in the LED driving circuit. When the LED driving circuit is in a closed state, the first LED and the second LED are used to provide light sources for the target vehicle buttons mounted above the first LED and the second LED, respectively.
[0014] Furthermore, when the first LED and the second LED are used to provide light for the target vehicle buttons mounted above the first LED and the second LED, respectively, the first LED and the second LED are used for:
[0015] The first LED provides a light source for the first character area of the target vehicle's keypad; the second LED provides a light source for the second character area of the target vehicle's keypad.
[0016] Furthermore, the status display circuit includes an LED detection module, a first resistor, and a second resistor.
[0017] The first terminal of the LED detection module is connected to the first terminal of the first resistor and the first terminal of the second resistor, respectively; the first terminal of the first resistor and the first terminal of the second resistor are connected to the second terminal of the LED driving circuit, respectively; the second terminal of the first resistor and the second terminal of the second resistor are connected to the first terminal of the switch control circuit, respectively.
[0018] The LED detection module is used to detect the voltage signal at the common node corresponding to the first resistor and the second resistor, respectively, so as to detect and display the switching state of the LED driving circuit.
[0019] Furthermore, when the LED detection module is used to detect the voltage signal at the common node corresponding to the first resistor and the second resistor, respectively, to detect the switching state of the LED driving circuit, the LED detection module is used to:
[0020] When the LED detection module detects that the voltage signal at the common node corresponding to the first resistor and the second resistor is high, it determines that the switch state of the LED driving circuit is closed and displays that the switch state of the LED driving circuit is closed.
[0021] When the LED detection module detects that the voltage signal at the common node corresponding to the first resistor and the second resistor is low, it determines that the switch state of the LED driving circuit is open and displays that the switch state of the LED driving circuit is open.
[0022] Furthermore, the first resistor and the second resistor are respectively used as voltage divider resistors to divide the voltage of the LED driver circuit to prevent the LED lamp in the LED driver circuit from being overloaded.
[0023] Furthermore, the switch control circuit includes a switch signal receiving module, a third resistor, a filter capacitor, and a control transistor.
[0024] The collector terminal of the control transistor is connected to the second terminal of the status display circuit; the first terminal of the switch signal receiving module is connected to the first terminal of the third resistor; the second terminal of the third resistor is connected to the first terminal of the filter capacitor and the base terminal of the control transistor; the second terminal of the filter capacitor and the emitter terminal of the control transistor are grounded.
[0025] The switch signal receiving module is used to receive externally input switch control signals; the control transistor is used to control the switching state of the LED driving circuit according to the switch control signals.
[0026] Furthermore, the third resistor serves as the base bias resistor of the control transistor, used to limit the conduction current of the control transistor.
[0027] The filter capacitor is used to stabilize the voltage at the base terminal of the control transistor.
[0028] Furthermore, when the control transistor is used to control the switching state of the LED driving circuit according to the switching control signal, the control transistor is used to:
[0029] When the switch signal receiving module receives an externally input switch control signal to turn on the LED, the control transistor is in the conducting state to control the switch state of the LED driving circuit to be closed.
[0030] When the switch signal receiving module receives an externally input switch control signal to turn off the LED, the control transistor is in the off state to control the LED driver circuit to be in the open state.
[0031] This application provides a vehicle button lighting control circuit, which, compared to existing circuits that directly control the on / off state of an LED light through an LED light, an additional lampshade, and an on / off switch, receives an externally input switch control signal through a switch control circuit to control the on / off state of the LED driver circuit. When the switch is closed, the LED driver circuit uses the power output provided by the power supply to provide a light source for the vehicle buttons, improving the brightness and uniformity of the vehicle button characters. The on / off state of the LED driver circuit is displayed through a status display circuit, improving the stability and controllability of the vehicle button lighting, thereby enhancing the user experience of using the vehicle buttons.
[0032] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0034] Figure 1 This is one of the structural schematic diagrams of a vehicle button light control circuit provided in an embodiment of this application;
[0035] Figure 2 A second schematic diagram of a control circuit for a vehicle button light provided in an embodiment of this application;
[0036] Figure 3 This is a schematic diagram illustrating the effect of a vehicle button light provided in an embodiment of this application.
[0037] Icon: Vehicle button light control circuit: 10; Power supply: 110; LED driver circuit: 120; Status display circuit: 130; Switch control circuit: 140; DC power supply: 111; Power switch: 112; First LED: D1; Second LED: D2; LED detection module: 131; First resistor: R1; Second resistor: R2; Switch signal receiving module: 141; Third resistor: R3; Filter capacitor: C1; Control transistor: Q1. Detailed Implementation
[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. Based on the embodiments of this application, every other embodiment obtained by those skilled in the art without inventive effort falls within the scope of protection of this application.
[0039] Research has found that physical or touch buttons in vehicles typically use an LED light and an additional lampshade to achieve their lighting effects. This results in the characters on the vehicle buttons failing to meet the basic requirements for brightness and uniformity, especially when the characters are large, thus reducing the brightness and uniformity of the vehicle button characters.
[0040] Existing vehicle button lighting control circuits typically control the LED lights directly through on / off switches. Furthermore, they cannot detect and display the LED light's on / off status in real time, making it impossible to determine the fault situation when the switch is closed and the LED light fails to illuminate. This reduces the stability and controllability of vehicle button lighting, thereby diminishing the user experience when using vehicle buttons.
[0041] Based on this, this application provides a control circuit for vehicle button lighting. The switch control circuit receives an externally input switch control signal and controls the switching state of the LED driver circuit. When the switch is closed, the LED driver circuit uses the power output provided by the power supply to provide a light source for the vehicle buttons, improving the brightness and uniformity of the vehicle button characters. The status display circuit displays the switching state of the LED driver circuit, improving the stability and controllability of the vehicle button lighting, thereby enhancing the user experience of using the vehicle buttons.
[0042] Please see Figure 1 , Figure 1This is one of the structural schematic diagrams of a vehicle button light control circuit provided in an embodiment of this application. Figure 1 As shown in the figure, the vehicle button light control circuit provided in this application embodiment includes a power supply 110, an LED driver circuit 120, a status display circuit 130, and a switch control circuit 140.
[0043] The power supply 110 is connected to the LED driving circuit 120; the LED driving circuit 120 is connected to the status display circuit 130; and the status display circuit 130 is connected to the switch control circuit 140.
[0044] The power supply 110 is used to provide power output to the LED driving circuit 120, the status display circuit 130 and the switch control circuit 140 respectively.
[0045] The switch control circuit 140 is used to receive externally input switch control signals and control the switching state of the LED driver circuit 120 according to the switch control signals.
[0046] When the switch is closed, the LED driving circuit 120 emits light using the power output provided by the power supply 110, providing a light source for the target vehicle button installed above the LED driving circuit 120.
[0047] The status display circuit 130 is used to display the switching status of the LED driving circuit 120.
[0048] The LED driving circuit 120 has switching states including closed and open; the switch control circuit 140 receives externally input switch control signals including turning on the LED and turning off the LED.
[0049] Here, when the switch control circuit 140 receives an externally input switch control signal to turn on the LED, the switch control circuit 140 is turned on, making the switch state of the LED driving circuit 120 closed. The power output provided by the power supply 110 forms a loop through the LED driving circuit 120, the status display circuit 130, and the switch control circuit 140, causing the LED in the LED driving circuit 120 to light up. The status display circuit 130 is pulled to a high level to indicate that the switch state of the LED driving circuit 120 is closed.
[0050] When the switch control circuit 140 receives an externally input switch control signal to turn off the LED, the switch control circuit 140 is cut off, causing the LED driving circuit 120 to be in an open state, thus turning off the LED in the LED driving circuit 120. The status display circuit 130 is pulled to a low level to indicate that the LED driving circuit 120 is in an open state.
[0051] For further details, please refer to Figure 2 , Figure 2 This is a second schematic diagram of a control circuit for a vehicle button light provided in an embodiment of this application. Figure 2 As shown, the power supply 110 includes a DC power supply 111 and a power switch 112:
[0052] The first terminal of the DC power supply 111 is connected to the first terminal of the power supply switch 112; the second terminal of the power supply switch 112 is connected to the first terminal of the LED driving circuit 120.
[0053] The DC power supply 111 is used to provide power output to the LED driving circuit 120, the status display circuit 130 and the switch control circuit 140 respectively; the power supply switch 112 is used to control the on and off of the DC power supply 111.
[0054] In one possible embodiment of this application, the DC power supply is generally selected as a 5V DC-DC power supply; the power supply switch 112 may include a gate switch circuit for controlling the on and off of the power supply, or it may include a MOS switch.
[0055] Furthermore, such as Figure 2 As shown, the LED driving circuit 120 includes a first LED D1 and a second LED D2:
[0056] The first end of the first LED D1 is connected to the first end of the power supply 110; the second end of the first LED D1 is connected to the first end of the status display circuit 130; the second LED D2 is connected in parallel with the first LED D1.
[0057] In this circuit, both the first LED D1 and the second LED D2 serve as light-emitting loads in the LED driving circuit 120. When the LED driving circuit 120 is in a closed state, the first LED D1 and the second LED D2 are used to provide light sources for the target vehicle buttons installed above the first LED D1 and the second LED D2, respectively.
[0058] In this embodiment of the application, the first LED lamp D1 and the second LED lamp D2 are both light-emitting diodes.
[0059] For example, both the first LED D1 and the second LED D2 can be selected as a light-emitting diode with the model number "1608-C70100H-AM". This model number indicates a high-brightness red or amber LED in a 1.6×0.8mm package, suitable for miniaturized indicator lights or low-power lighting.
[0060] Furthermore, when the first LED light D1 and the second LED light D2 are used to provide light for the target vehicle button mounted above the first LED light D1 and the second LED light D2 respectively, the first LED light D1 and the second LED light D2 are respectively used for:
[0061] The first LED light D1 provides a light source for the first character area of the target vehicle's keypad; the second LED light D2 provides a light source for the second character area of the target vehicle's keypad.
[0062] For example, please refer to Figure 3 , Figure 3 This is a schematic diagram illustrating the effect of a vehicle button light provided in an embodiment of this application. Figure 3 As shown, the illumination range of the first LED light D1 is the area between beam a and beam c, which corresponds to the first character area of the character on the target vehicle's keypad; the illumination range of the second LED light D2 is the area between beam b and beam d, which corresponds to the second character area of the character on the target vehicle's keypad.
[0063] Furthermore, such as Figure 2 As shown, the status display circuit 130 includes an LED detection module 131, a first resistor R1, and a second resistor R2.
[0064] The first terminal of the LED detection module 131 is connected to the first terminal of the first resistor R1 and the first terminal of the second resistor R2 respectively; the first terminal of the first resistor R1 and the first terminal of the second resistor R2 are connected to the second terminal of the LED driving circuit 120 respectively; the second terminal of the first resistor R1 and the second terminal of the second resistor R2 are connected to the first terminal of the switch control circuit 140 respectively.
[0065] The LED detection module 131 is used to detect the voltage signal at the common node corresponding to the first resistor R1 and the second resistor R2, so as to detect and display the switching state of the LED driving circuit 120.
[0066] Furthermore, when the LED detection module 131 is used to detect the voltage signals at the common nodes corresponding to the first resistor R1 and the second resistor R2, respectively, to detect the switching state of the LED driving circuit 120, the LED detection module 131 is used to:
[0067] When the LED detection module 131 detects that the voltage signal at the common node corresponding to the first resistor R1 and the second resistor R2 is high, it determines that the switch state of the LED driving circuit 120 is closed, and displays that the switch state of the LED driving circuit 120 is closed.
[0068] When the LED detection module 131 detects that the voltage signal at the common node corresponding to the first resistor R1 and the second resistor R2 is low, it determines that the switch state of the LED driving circuit 120 is open and displays that the switch state of the LED driving circuit 120 is open.
[0069] For example, assuming the DC power output provided by the power supply is 5V, when the LED detection module 131 detects that the voltage at the common node corresponding to the first resistor R1 and the second resistor R2 is 3V, that is, it detects that the voltage of the LED driving circuit is 3V, determines that the voltage signal at the common node corresponding to the first resistor R1 and the second resistor R2 is high level, and displays that the switch state of the LED driving circuit 120 is closed; when the LED detection module 131 detects that the voltage at the common node corresponding to the first resistor R1 and the second resistor R2 is 0V, that is, it detects that the voltage of the LED driving circuit is 0V, determines that the voltage signal at the common node corresponding to the first resistor R1 and the second resistor R2 is low level, and displays that the switch state of the LED driving circuit 120 is open.
[0070] Furthermore, the first resistor R1 and the second resistor R2 are respectively used as voltage divider resistors to divide the voltage of the LED driver circuit 120 to prevent the LED lamps (D1 and D2) in the LED driver circuit 120 from being overloaded.
[0071] Furthermore, such as Figure 2 As shown, the switch control circuit 140 includes a switch signal receiving module 141, a third resistor R3, a filter capacitor C1, and a control transistor Q1.
[0072] The collector terminal of the control transistor Q1 is connected to the second terminal of the status display circuit 130; the first terminal of the switch signal receiving module 141 is connected to the first terminal of the third resistor R3; the second terminal of the third resistor R3 is connected to the first terminal of the filter capacitor C1 and the base terminal of the control transistor Q1 respectively; the second terminal of the filter capacitor C1 and the emitter terminal of the control transistor are grounded to GND respectively.
[0073] The switch signal receiving module 141 is used to receive externally input switch control signals; the control transistor Q1 is used to control the switching state of the LED driving circuit 120 according to the switch control signals.
[0074] In this embodiment, the externally input switch control signal can be issued by the vehicle MCU or by the driver or passengers through physical button pressing or touch button touching.
[0075] Furthermore, the third resistor R3 serves as the base bias resistor of the control transistor Q1, used to limit the conduction current of the control transistor Q1; the filter capacitor C1 is used to stabilize the voltage at the base of the control transistor Q1.
[0076] Furthermore, when the control transistor Q1 is used to control the switching state of the LED driving circuit 120 according to the switching control signal, the control transistor Q1 is used for:
[0077] When the switch signal receiving module 141 receives an externally input switch control signal to turn on the LED, the control transistor Q1 is in the conducting state to control the switch state of the LED driving circuit 120 to be closed.
[0078] When the switch signal receiving module 141 receives an externally input switch control signal to turn off the LED, the control transistor Q1 is in the off state to control the LED driver circuit 120 to be in the open state.
[0079] This application provides a control circuit for vehicle button lighting. It receives externally input switch control signals through a switch control circuit to control the switching state of an LED driver circuit. When the switch is closed, the LED driver circuit uses the power output from the power supply to provide a light source for the vehicle buttons, improving the brightness and uniformity of the button characters. A status display circuit shows the switching state of the LED driver circuit, enhancing the stability and controllability of the vehicle button lighting and thus improving the user experience when using the vehicle buttons.
[0080] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the methods, systems, devices, and units described above can be referred to the corresponding processes in the foregoing device embodiments, and will not be repeated here.
[0081] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A control circuit for vehicle key light, characterized by, The control circuit includes a power supply, an LED driver circuit, a status display circuit, and a switch control circuit. The power supply is connected to the LED driving circuit; the LED driving circuit is connected to the status display circuit; the status display circuit is connected to the switch control circuit. The power supply is used to provide power output to the LED driving circuit, the status display circuit and the switch control circuit respectively; the switch control circuit is used to receive externally input switch control signals and control the switching state of the LED driving circuit according to the switch control signals. When the switch is closed, the LED driving circuit emits light using the power output provided by the power supply to provide a light source for the target vehicle button installed above the LED driving circuit; the status display circuit is used to display the switch status of the LED driving circuit.
2. The circuit of claim 1, wherein, The power supply includes a DC power supply and a power switch: The first terminal of the DC power supply is connected to the first terminal of the power supply switch; the second terminal of the power supply switch is connected to the first terminal of the LED driver circuit. The DC power supply is used to provide power output to the LED driving circuit, the status display circuit, and the switch control circuit respectively; the power supply switch is used to control the on and off of the DC power supply.
3. The circuit of claim 1, wherein, The LED driving circuit includes a first LED and a second LED: The first end of the first LED is connected to the first end of the power supply; the second end of the first LED is connected to the first end of the status display circuit; the second LED is connected in parallel with the first LED. Both the first LED and the second LED serve as light-emitting loads in the LED driving circuit. When the LED driving circuit is in a closed state, the first LED and the second LED are used to provide light sources for the target vehicle buttons mounted above the first LED and the second LED, respectively.
4. The circuit of claim 3, wherein, When the first LED and the second LED are used to provide light for a target vehicle button mounted above the first LED and the second LED, respectively, the first LED and the second LED are used for: The first LED provides a light source for the first character area of the target vehicle's keypad; the second LED provides a light source for the second character area of the target vehicle's keypad.
5. The circuit of claim 1, wherein, The status display circuit includes an LED detection module, a first resistor, and a second resistor. The first terminal of the LED detection module is connected to the first terminal of the first resistor and the first terminal of the second resistor, respectively; the first terminal of the first resistor and the first terminal of the second resistor are connected to the second terminal of the LED driving circuit, respectively; the second terminal of the first resistor and the second terminal of the second resistor are connected to the first terminal of the switch control circuit, respectively. The LED detection module is used to detect the voltage signal at the common node corresponding to the first resistor and the second resistor, respectively, so as to detect and display the switching state of the LED driving circuit.
6. The circuit of claim 5, wherein, When the LED detection module is used to detect the voltage signal at the common node corresponding to the first resistor and the second resistor, respectively, in order to detect the switching state of the LED driving circuit, the LED detection module is used for: When the LED detection module detects that the voltage signal at the common node corresponding to the first resistor and the second resistor is high, it determines that the switch state of the LED driving circuit is closed and displays that the switch state of the LED driving circuit is closed. When the LED detection module detects that the voltage signal at the common node corresponding to the first resistor and the second resistor is low, it determines that the switch state of the LED driving circuit is open and displays that the switch state of the LED driving circuit is open.
7. The circuit of claim 5, wherein, The first resistor and the second resistor serve as voltage divider resistors to divide the voltage of the LED driver circuit, thereby preventing the LED lamps in the LED driver circuit from being overloaded.
8. The circuit of claim 1, wherein, The switch control circuit includes a switch signal receiving module, a third resistor, a filter capacitor, and a control transistor. The collector terminal of the control transistor is connected to the second terminal of the status display circuit; the first terminal of the switch signal receiving module is connected to the first terminal of the third resistor; the second terminal of the third resistor is connected to the first terminal of the filter capacitor and the base terminal of the control transistor; the second terminal of the filter capacitor and the emitter terminal of the control transistor are grounded. The switch signal receiving module is used to receive externally input switch control signals; the control transistor is used to control the switching state of the LED driving circuit according to the switch control signals.
9. The circuit of claim 8, wherein, The third resistor serves as the base bias resistor for the control transistor, and is used to limit the conduction current of the control transistor. The filter capacitor is used to stabilize the voltage at the base terminal of the control transistor.
10. The circuit of claim 8, wherein, When the control transistor is used to control the switching state of the LED driving circuit according to the switching control signal, the control transistor is used for: When the switch signal receiving module receives an externally input switch control signal to turn on the LED, the control transistor is in the conducting state to control the switch state of the LED driving circuit to be closed. When the switch signal receiving module receives an externally input switch control signal to turn off the LED, the control transistor is in the off state to control the LED driver circuit to be in the open state.