Control circuit of vehicle indicating lamp and vehicle
By combining the main control circuit, constant current drive circuit, switching circuit and detection circuit, efficient control of vehicle indicator lights is achieved, reducing vehicle costs and enhancing the reliability and fault detection capability of the control circuit.
Patent Information
- Application Number
- CN202520066365.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-10
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-01-10
AI Technical Summary
The diversity of driving circuits for existing vehicle indicator lights increases vehicle costs.
The system employs a combination of a main control circuit, a constant current drive circuit, a switching circuit, and a detection circuit. The switching circuit controls the conduction of the constant current drive circuit and the indicator light, thereby enabling the reuse of the constant current drive circuit and reducing the number of constant current drive circuits required.
This reduces the cost of vehicle indicator light control circuits and improves the reliability and fault detection capabilities of the control circuits.
Smart Images
Figure CN223786220U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of vehicle technology, and in particular to a control circuit for a vehicle indicator light and a vehicle. Background Technology
[0002] Existing vehicle indicator lights serve not only for illumination but also for signal indication. For example, vehicle signal indicator lights include turn signals and daytime running lights. This diversity in signal indicator light categories increases the number of drive circuits required for different indicator lights, thus increasing vehicle costs. Utility Model Content
[0003] This application provides a control circuit for vehicle indicator lights and a vehicle, which can reduce the cost of vehicles using the control circuit for vehicle indicator lights of this application.
[0004] This application provides a control circuit for a vehicle indicator light. The control circuit includes a main control circuit, a constant current drive circuit, a switching circuit, and a detection circuit. The constant current drive circuit is connected to the main control circuit. The switching circuit is connected to the constant current drive circuit and the main control circuit, and is configured to connect to a first indicator light and a second indicator light. The detection circuit is connected to the switching circuit and the main control circuit, and is used to detect the voltage signal output by the switching circuit. The main control circuit is used to control the constant current drive circuit to drive the first indicator light or the second indicator light, and to control the switching circuit to connect the constant current drive circuit to the first indicator light or the second indicator light. The main control circuit monitors the first indicator light and the second indicator light based on the voltage signal and the display status of the first indicator light and the display status of the second indicator light.
[0005] In one embodiment, the switching circuit includes a first sub-switching circuit and a second sub-switching circuit. The first sub-switching circuit is connected to the constant current driving circuit, the main control circuit, and the detection circuit, and is configured to connect to a first indicator light. The second sub-switching circuit is connected to the constant current driving circuit, the main control circuit, and the detection circuit, and is configured to connect to a second indicator light.
[0006] In one embodiment, the detection circuit includes a voltage divider circuit and an electrostatic discharge (ESD) protection circuit. The voltage divider circuit is connected to the switching circuit and the main control circuit; the ESD protection circuit is connected to the voltage divider circuit and the main control circuit.
[0007] In one embodiment, the detection circuit further includes a filter circuit, which is connected to the voltage divider circuit, the electrostatic discharge protection circuit, and the main control circuit.
[0008] In one embodiment, the electrostatic discharge protection circuit includes a first diode and a second diode. The cathode of the first diode is connected to a voltage divider circuit and a main control circuit, and the anode of the first diode is grounded. The anode of the second diode is connected to the cathode of the first diode, the voltage divider circuit, and the main control circuit, and the anode of the second diode is connected to a power supply signal.
[0009] In one embodiment, the first sub-switch circuit includes a first switch transistor and a second switch transistor. The first terminal of the first switch transistor is connected to a constant current drive circuit, and the second terminal of the first switch transistor is connected to a detection circuit and configured to be connected to a first indicator light. The first terminal of the second switch transistor is connected to the control terminal of the first switch transistor, the second terminal of the second switch transistor is grounded, and the control terminal of the second switch transistor is connected to the main control circuit. Alternatively, the second sub-switch circuit includes a third switch transistor and a fourth switch transistor. The first terminal of the third switch transistor is connected to a constant current drive circuit, the second terminal of the third switch transistor is connected to a detection circuit and configured to be connected to a second indicator light. The first terminal of the fourth switch transistor is connected to the control terminal of the third switch transistor, the second terminal of the fourth switch transistor is grounded, and the control terminal of the fourth switch transistor is connected to the main control circuit.
[0010] In one embodiment, the first sub-switch circuit further includes a capacitor, a first resistor, and a second resistor. The two ends of the capacitor are respectively connected to the first terminal and the control terminal of the first switching transistor; the first resistor is connected in parallel with the capacitor; and the two ends of the second resistor are respectively connected to the control terminal of the first switching transistor and the first terminal of the second switching transistor.
[0011] In one embodiment, the first sub-switch circuit further includes a clamping diode, the cathode of which is connected to the first terminal of the first switching transistor, and the anode of which is connected to the control terminal of the first switching transistor.
[0012] This application provides a vehicle that includes the aforementioned control circuit.
[0013] In one embodiment, the switching circuit includes a first sub-switching circuit and a second sub-switching circuit. The vehicle also includes a first indicator light and a second indicator light. The first indicator light is connected to the first sub-switching circuit and is used for turn indication. The second indicator light is connected to the second sub-switching circuit and is used for position indication or daytime running light indication.
[0014] The beneficial effects of this application are as follows: The control circuit for the vehicle indicator lights in this embodiment includes a main control circuit, a constant current drive circuit, a switching circuit, and a detection circuit. The main control circuit is connected to the drive circuit, the switching circuit, and the detection circuit respectively. The switching circuit is also connected to the drive circuit and the detection circuit, and is configured to connect to the first indicator light and the second indicator light. The switching circuit can be controlled by the main control circuit, causing it to connect the constant current drive circuit to the first indicator light, or to the second indicator light. In other words, this application reduces the need for a constant current drive circuit by using a switching circuit, thereby lowering the cost of the vehicle indicator light control circuit and ultimately reducing the cost of vehicles using the control circuit for vehicle indicator lights described in this application. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:
[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the vehicle indicator light control circuit provided in this application;
[0017] Figure 2 This is a circuit diagram of an embodiment of the first sub-switch circuit provided in this application;
[0018] Figure 3 This is a circuit diagram of one embodiment of the detection circuit provided in this application. Detailed Implementation
[0019] 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 a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0020] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.
[0021] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.
[0022] This application provides a control circuit for vehicle indicator lights, see reference. Figure 1 , Figure 1This is a schematic diagram of an embodiment of the vehicle indicator light control circuit provided in this application. The control circuit 10 includes a main control circuit 11, a constant current drive circuit 12, a switching circuit (not labeled), and a detection circuit 14. The main control circuit 11 is connected to the constant current drive circuit 12, the switching circuit, and the detection circuit 14. The switching circuit is also connected to the constant current drive circuit 12 and the detection circuit 14, and is configured to connect to the first indicator light 21 and the second indicator light 22.
[0023] The main control circuit 11 includes a processor, which may be referred to as a CPU (Central Processing Unit). The processor may be an integrated circuit chip with signal processing capabilities. The processor can also be a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The main control circuit 11 also includes peripheral circuits to maintain the normal operation of the processor. These peripheral circuits include, for example, crystal oscillator circuits and reset circuits, and are not limited thereto.
[0024] The constant current drive circuit 12 is used to output a constant current power supply signal, which is used to illuminate the first indicator light 21 and the second indicator light 22. The constant current drive circuit 12 can be a highly integrated constant current drive chip, or it can be a conventional circuit capable of outputting a constant current power supply signal; there are no restrictions on this. The control circuit 10 can control the constant current drive circuit 12 to output or stop outputting the constant current power supply signal. Therefore, the control circuit 10 can control whether the first indicator light 21 and the second indicator light 22 are working by controlling whether the constant current drive circuit 12 is working.
[0025] The switching circuit is connected to the constant current drive circuit 12 and the main control circuit 11, and is configured to connect to the first indicator light 21 and the second indicator light 22. The switching circuit can be controlled by the main control circuit 11, so that the switching circuit connects the constant current drive circuit 12 to the first indicator light 21, or connects the constant current drive circuit 12 to the second indicator light 22. That is, by setting the switching circuit, this application enables the constant current drive circuit 12 to be reused, thereby reducing the number of constant current drive circuits 12 required and reducing the cost of the vehicle indicator light control circuit 10, thus reducing the cost of vehicles using the vehicle indicator light control circuit 10 of this application.
[0026] The detection circuit 14 is used to detect the voltage signal output by the switching circuit. The main control circuit 11 monitors the first indicator light 21 and the second indicator light 22 based on the voltage signal and the display status of the first indicator light 21 and the second indicator light 22. Understandably, by monitoring the voltage signal, the control circuit 10 can monitor the first indicator light 21 or the second indicator light 22 that is connected to the constant current drive circuit 12, determine whether the first indicator light 21 or the second indicator light 22 is faulty, and implement timely protection strategies when a fault occurs, thereby enhancing the reliability of the vehicle indicator light control circuit 10.
[0027] In one embodiment, the switching circuit includes a first sub-switching circuit 131 and a second sub-switching circuit 132. The first sub-switching circuit 131 is connected to the main control circuit 11, the constant current driving circuit 12, and the detection circuit 14, and is configured to connect to the first indicator light 21. The second sub-switching circuit 132 is connected to the main control circuit 11, the constant current driving circuit 12, and the detection circuit 14, and is configured to connect to the second indicator light 22. It is understood that the main control circuit 11 can control the constant current driving circuit 12 to connect to the first indicator light 21 or the second indicator light 22 by controlling the on / off state of the first sub-switching circuit 131 or the second sub-switching circuit 132. In this embodiment, the switching circuit, by setting a first sub-switching circuit and a second sub-switching circuit 132, enables the constant current driving circuit 12 to drive the first indicator light 21 or the second indicator light 22 corresponding to the first sub-switching circuit 131 or the second sub-switching circuit 132. This allows the constant current driving circuit 12 to be reused, reducing the number of constant current driving circuits 12 and lowering costs. In addition, the main control circuit 11, by controlling the conduction and cutoff of the first sub-switching circuit 131 and the second sub-switching circuit 132, can accurately control the conduction and cutoff of the first indicator light 21 and the second indicator light 22, reducing control difficulty and enhancing the reliability of the control circuit 10.
[0028] In one embodiment, see Figure 2 , Figure 2This is a circuit diagram of an embodiment of the first sub-switch circuit provided in this application. The first sub-switch circuit 131 includes a first switch Q1 and a second switch Q2. The first terminal of the first switch Q1 is connected to the constant current drive circuit 12, and the second terminal of the first switch Q1 is connected to the detection circuit 14 and configured to connect to the first indicator light 21. The first terminal of the second switch Q2 is connected to the control terminal of the first switch Q1, the second terminal of the second switch Q2 is grounded, and the control terminal of the second switch Q2 is connected to the main control circuit 11. Understandably, the main control circuit 11 controls the conduction and cutoff of the first switch Q1 by controlling the conduction and cutoff of the second switch Q2, thereby turning on or off the constant current drive circuit 12 and the first indicator light 21, thus controlling the illumination of the first indicator light 21. The first sub-switch circuit 131 of this embodiment has a simple structure, is easy to implement, and has few components, which can reduce costs.
[0029] In one embodiment, the first switch Q1 is a field-effect transistor (FET). The second switch Q2 can be either a FET or a bipolar junction transistor (BJT), and there is no limitation on this.
[0030] In one embodiment, the second sub-switch circuit 132 includes a third switch (not shown) and a fourth switch (not shown). The first terminal of the third switch is connected to the constant current drive circuit 12, and the second terminal is connected to the detection circuit 14 and configured to connect to the second indicator light 22. The first terminal of the fourth switch is connected to the control terminal of the third switch, the second terminal of the fourth switch is grounded, and the control terminal of the fourth switch is connected to the main control circuit 11. Understandably, the main control circuit 11 controls the conduction and cutoff of the three switches by controlling the conduction and cutoff of the fourth switch, thereby turning on or off the constant current drive circuit 12 and the second indicator light 22, thus controlling the illumination of the second indicator light 22. The second sub-switch circuit 132 in this embodiment has a simple structure, is easy to implement, and has few components, thus reducing costs. Furthermore, the second sub-switch circuit 132 has the same structure as the first sub-switch circuit 131, which can reduce the development cycle of the first sub-switch circuit 131 and the second sub-switch circuit 132, further reducing costs.
[0031] In one embodiment, the first sub-switch circuit 131 further includes a capacitor C31, a first resistor R31, and a second resistor R32. The capacitor C31 and the first resistor R31 are connected in parallel and are respectively connected to the first terminal and the control terminal of the first switching transistor Q1. The two ends of the second resistor R32 are respectively connected to the control terminal of the first switching transistor Q1 and the first terminal of the second switching transistor Q2. The capacitor C31, the first resistor R31, and the second resistor R32 can delay the conduction voltage between the first terminal and the control terminal of the first switching transistor Q1, enabling the first switching transistor Q1 to achieve a soft start. This allows for a soft start of the constant current power supply signal output by the constant current drive circuit 12, reducing the impact on the first indicator light 21 and the second indicator light 22, and enhancing the reliability of the control circuit 10.
[0032] In one embodiment, the first sub-switch circuit 131 further includes a clamping diode D31. The cathode of the clamping diode D31 is connected to the first terminal of the first switching transistor Q1, and the anode of the clamping diode D31 is connected to the control terminal of the first switching transistor Q1. By providing the clamping diode D31, the first sub-switch circuit 131 in this embodiment prevents the first switching transistor Q1 from being broken down by the high voltage output from the constant current drive circuit 12, thereby enhancing the anti-interference capability of the first switching transistor Q1, thus enhancing the reliability of the first sub-switch circuit 131, and consequently enhancing the reliability of the control circuit 10.
[0033] In one embodiment, the detection circuit 14 includes a voltage divider circuit (not shown) and an electrostatic discharge (ESD) protection circuit (not shown). The voltage divider circuit is connected to the switching circuit and the main control circuit 11. The ESD protection circuit is connected to the voltage divider circuit and the main control circuit 11. The main control circuit 11 has an AD acquisition function. The voltage divider circuit divides the voltage signal output by the switching circuit, and the main control circuit 11 acquires the voltage signal output by the voltage divider circuit, enabling fault monitoring based on the voltage signal and the display status of the first indicator light 21 and the second indicator light 22. The ESD protection circuit protects the main control circuit 11, enhances its anti-interference capability, and improves the reliability of the vehicle indicator light control circuit 10.
[0034] In one embodiment, the detection circuit 14 further includes a filtering circuit (not shown in the figure), which is connected to the voltage divider circuit, the electrostatic discharge protection circuit, and the switching circuit. The filtering circuit can reduce the interference signal output by the voltage divider circuit, enabling the main control circuit 11 to acquire a clear and effective voltage signal, thereby improving the accuracy of the voltage signal and enhancing the effectiveness of monitoring the first indicator light 21 and the second indicator light 22, that is, enhancing the reliability of the vehicle indicator light control circuit 10.
[0035] In one embodiment, see Figure 3 , Figure 3This is a circuit diagram of an embodiment of the detection circuit provided in this application. The electrostatic discharge (ESD) protection circuit includes a first diode D1 and a second diode D2. The cathode of the first diode D1 is connected to the voltage divider circuit and the main control circuit 11, and the anode of the first diode D1 is grounded. The anode of the second diode D2 is connected to the cathode of the first diode D1, the voltage divider circuit, and the main control circuit 11, and the anode of the second diode D2 is connected to the power supply signal. The ESD protection circuit of this embodiment includes a first diode D1 and a second diode D2, has a simple structure, fewer electronic components, and can reduce costs.
[0036] In one embodiment, the voltage divider circuit includes resistors R41 and R42; the filter circuit includes capacitor C41 and resistor R43; and the electrostatic discharge (ESD) protection circuit includes a first diode D1 and a second diode D2. One end of resistor R41 is connected to the switching circuit, and the other end of resistor R41 is connected to one end of resistor R42, one end of resistor R43, the cathode of the first diode D1, and the anode of the second diode D2; the other end of resistor R42 is grounded; one end of capacitor C41 is connected to the main control circuit 11 and the other end of resistor R43, and the other end of capacitor C41 is grounded; the anode of the first diode D1 is grounded; and the cathode of the second diode D2 is connected to the power supply signal. Resistor R43 and capacitor C41 form an RC filter circuit, which has a simple structure and low cost while achieving filtering. Furthermore, resistor R43 can protect the acquisition terminal of the main control circuit 11. The detection circuit 14 in this embodiment has a simple structure and few electronic components, which reduces the design difficulty and cost of the detection circuit 14. Simultaneously, the detection circuit 14 also has ESD protection, enhancing its interference detection capability.
[0037] This application provides a vehicle that includes a control circuit 10 for vehicle indicator lights. The control circuit 10 for vehicle indicator lights can be any of the control circuits 10 described in the above embodiments, and is not limited herein.
[0038] In one embodiment, the switching circuit includes a first sub-switching circuit 131 and a second sub-switching circuit 132, and the vehicle also includes a first indicator light 21 and a second indicator light 22. The first indicator light 21 is connected to the first sub-switching circuit 131 and is used for vehicle turn indication. The second indicator light 22 is connected to the second sub-switching circuit 132 and is used for vehicle position indication or daytime running light indication.
[0039] Specifically, the first indicator light 21 is composed of multiple LED beads connected in series. When the first indicator light 21 is lit, all LED beads are lit simultaneously; when the first indicator light 21 is off, all LED beads are off simultaneously. Similarly, there is a second indicator light 22.
[0040] The above are merely embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.
Claims
1. A control circuit for a vehicle indicator light, characterized in that, include: Main control circuit; A constant current drive circuit is connected to the main control circuit; A switching circuit is connected to the constant current drive circuit and the main control circuit, and is configured to connect to the first indicator light and the second indicator light; A detection circuit, connected to the switching circuit and the main control circuit, is used to detect the voltage signal output by the switching circuit; The main control circuit is used to control the constant current drive circuit to drive the first indicator light or the second indicator light, and to control the switching circuit to connect the constant current drive circuit to the first indicator light or the constant current drive circuit to the second indicator light; and the main control circuit monitors the first indicator light and the second indicator light based on the voltage signal and the display status of the first indicator light and the display status of the second indicator light.
2. The control circuit according to claim 1, characterized in that, The switching circuit includes: The first sub-switch circuit is connected to the constant current drive circuit, the main control circuit and the detection circuit, and is configured to connect to the first indicator light; The second sub-switch circuit is connected to the constant current drive circuit, the main control circuit and the detection circuit, and is configured to connect to the second indicator light.
3. The control circuit according to claim 1, characterized in that, The detection circuit includes: The voltage divider circuit is connected to the switching circuit and the main control circuit. An electrostatic discharge protection circuit is connected to the voltage divider circuit and the main control circuit.
4. The control circuit according to claim 3, characterized in that, The detection circuit further includes: The filter circuit is connected to the voltage divider circuit, the electrostatic protection circuit, and the main control circuit.
5. The control circuit according to claim 3, characterized in that, The electrostatic discharge protection circuit includes: The first diode has its cathode connected to the voltage divider circuit and the main control circuit, and its anode grounded. The anode of the second diode is connected to the cathode of the first diode, the voltage divider circuit, and the main control circuit, and the anode of the second diode is connected to the power supply signal.
6. The control circuit according to claim 2, characterized in that, The first sub-switch circuit includes: A first switching transistor, the first end of which is connected to the constant current driving circuit, and the second end of which is connected to the detection circuit and configured to be connected to the first indicator light; A second switching transistor, wherein the first terminal of the second switching transistor is connected to the control terminal of the first switching transistor, the second terminal of the second switching transistor is grounded, and the control terminal of the second switching transistor is connected to the main control circuit; or The second sub-switch circuit includes: The third switching transistor has its first end connected to the constant current drive circuit and its second end connected to the detection circuit, and is configured to be connected to the second indicator light. The fourth switch has its first terminal connected to the control terminal of the third switch, its second terminal grounded, and its control terminal connected to the main control circuit.
7. The control circuit according to claim 6, characterized in that, The first sub-switch circuit also includes: A capacitor, the two ends of which are respectively connected to the first terminal and the control terminal of the first switching transistor; The first resistor is connected in parallel with the capacitor; The second resistor has its two ends connected to the control terminal of the first switching transistor and the first terminal of the second switching transistor, respectively.
8. The control circuit according to claim 7, characterized in that, The first sub-switch circuit also includes: A clamping diode, wherein the cathode of the clamping diode is connected to the first terminal of the first switching transistor, and the anode of the clamping diode is connected to the control terminal of the first switching transistor.
9. A vehicle, characterized in that, include: The control circuit according to any one of claims 1-8.
10. The vehicle according to claim 9, characterized in that, The switching circuit includes a first sub-switching circuit and a second sub-switching circuit, and the vehicle further includes: The first indicator light is connected to the first sub-switch circuit and is used for turn indication. The second indicator light is connected to the second sub-switch circuit and is used for position indication or daytime indication.