Remote communication vehicle-mounted warning lamp

Abstract

The utility model discloses a remote communication vehicle-mounted warning lamp, belongs to the technical field of warning lamps, and solves the problems that a vehicle-mounted warning lamp for a trailer is poorly grounded, so that the brightness of the lamp is reduced after the loop resistance is increased, the reference level of a control signal drifts, and logic errors are influenced. And finally, the problems that the whole vehicle-mounted warning lamp for the trailer is dim and flickers irregularly are solved. Comprising a lamp holder, an LED load installed on the lamp holder and a warning lamp control circuit coupled with the LED load, and the warning lamp control circuit enables LED driving current to stably work in a closed loop which is independent of a vehicle body to be grounded by eliminating the influence of a grounding potential difference on a control signal and transmitting the signal. According to the utility model, through eliminating the influence of the grounding potential difference on the control signal and transmitting the signal, the LED driving current stably works in a closed loop which is independent of the grounding of the vehicle body.

Description

Technical Field

[0001] This utility model relates to the field of warning light technology, and in particular to a remote communication vehicle-mounted warning light. Background Technology

[0002] Trailer warning lights are an important safety device, primarily used to alert surrounding vehicles and pedestrians during towing operations. They are typically installed at the rear or side of the trailer and feature high brightness, high visibility, and flashing functionality to ensure sufficient attention under various lighting conditions. Warning lights generally use LED light sources due to their low energy consumption, long lifespan, and high brightness, effectively saving energy and reducing maintenance costs. The flashing mode of trailer warning lights can be adjusted according to actual needs, such as hazard flashing, single flashing, or constant flashing, to adapt to different road conditions and towing requirements. Furthermore, some trailer warning lights are waterproof, dustproof, and shockproof, enabling them to operate normally in harsh weather and road conditions. Installing trailer warning lights can significantly reduce the risk of accidents during towing, ensuring the safety and efficiency of towing operations.

[0003] However, due to poor grounding, the trailer warning lights experienced increased circuit resistance, resulting in decreased brightness, drift of the control signal reference level, and subsequent logic errors. Ultimately, this caused the trailer warning lights to become dim and flicker erratically.

[0004] Therefore, a remote communication vehicle warning light is proposed to solve or alleviate the above problems. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a remote communication vehicle warning light.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A remote communication vehicle warning light includes a lamp holder, an LED load mounted on the lamp holder, and a warning light control circuit coupled to the LED load. The warning light control circuit eliminates the influence of ground potential difference on the control signal and transmits the signal to ensure that the LED driving current operates stably in a closed loop independent of the vehicle body grounding.

[0008] Preferably, the warning light control circuit includes an input protection module, an isolated power supply module, a differential signal conversion module, a signal isolation module, and a constant current drive module. The input protection module receives the trailer power supply voltage, control signal, and power ground. The input terminal of the differential signal conversion module is connected to the output terminal of the input protection module. The input terminal of the isolated power supply module is connected to the output terminal of the input protection module, and the output terminal of the isolated power supply module generates isolated power and isolated ground. The input terminal of the signal isolation module is connected to the output terminal of the differential signal conversion module, and the output terminal of the signal isolation module uses the isolated ground as a reference ground. The power supply terminal of the constant current drive module is connected to the isolated power supply and isolated ground. The signal terminal of the constant current drive module is connected to the output terminal of the signal isolation module. The output terminal of the constant current drive module drives the LED load, and the current detection terminal of the LED load is connected to the feedback terminal of the constant current drive module.

[0009] Preferably, the input protection module includes a 3-pin waterproof socket and a TVS diode SMBJ15CA. The first pin of the 3-pin waterproof socket is used to receive the trailer power supply voltage, the second pin of the 3-pin waterproof socket is used to receive the control signal, and the third pin of the 3-pin waterproof socket is used to receive the power ground. The anode of the TVS diode SMBJ15CA is connected to the first pin of the 3-pin waterproof socket, and the cathode of the TVS diode SMBJ15CA is connected to the third pin of the 3-pin waterproof socket.

[0010] Preferably, the differential signal conversion module includes an LM2903 dual comparator and a TL431 reference source;

[0011] The first non-inverting input of the LM2903 dual comparator is connected to the second pin of the 3-pin waterproof socket in the input protection module via a first resistor. The first inverting input of the LM2903 dual comparator is connected to the third pin of the 3-pin waterproof socket in the input protection module via a second resistor. The second non-inverting input of the LM2903 dual comparator is connected to the second pin of the 3-pin waterproof socket in the input protection module via a third resistor. The second inverting input of the LM2903 dual comparator is connected to the reference output of the TL431 reference source via a fourth resistor. The anode of the TL431 reference source is grounded to the third pin of the 3-pin waterproof socket in the input protection module. The cathode of the TL431 reference source is connected to the first pin of the 3-pin waterproof socket in the input protection module via a fifth resistor. The reference terminal of the TL431 reference source is connected to the first pin of the 3-pin waterproof socket in the input protection module via a sixth resistor. The first and second outputs of the LM2903 dual comparator are both connected to the input of the signal isolation module.

[0012] Preferably, the signal isolation module includes a PC817 optocoupler. The anode of the PC817 optocoupler is connected to the first and second output terminals of the LM2903 dual comparator in the differential signal conversion module through a sixth resistor and a seventh resistor. The cathode of the PC817 optocoupler is connected to the third pin of the 3-pin waterproof socket in the input protection module. The emitter of the PC817 optocoupler is connected to the isolation ground of the isolation power supply module. The collector of the PC817 optocoupler is connected to the isolation power supply of the isolation power supply module through an eighth resistor and outputs an isolation signal.

[0013] Preferably, the isolated power supply module includes a DC-DC isolated converter, an electrolytic capacitor, and a ceramic capacitor. The Vin+ terminal of the DC-DC isolated converter is connected to the first pin of the 3-pin waterproof socket in the input protection module, and the Vin- terminal of the DC-DC isolated converter is connected to the third pin of the 3-pin waterproof socket in the input protection module. The Vout+ terminal of the DC-DC isolated converter outputs isolated power, and the Vout- terminal of the DC-DC isolated converter outputs isolated ground. The positive terminal of the electrolytic capacitor is connected to the Vout+ terminal of the DC-DC isolated converter, and the negative terminal of the electrolytic capacitor is connected to the Vout- terminal of the DC-DC isolated converter. The ceramic capacitor is connected across the Vout+ and Vout- terminals of the DC-DC isolated converter.

[0014] Preferably, the constant current drive module includes a constant current drive chip PT4115. The power input terminal of the constant current drive chip PT4115 is connected to the isolation power supply of the isolation power supply module. The ground terminal of the constant current drive chip PT4115 is connected to the isolation ground of the isolation power supply module. The dimming terminal of the constant current drive chip PT4115 receives an isolation signal. The chip select terminal of the constant current drive chip PT4115 is connected to the isolation ground of the isolation power supply module through a sampling resistor. The switching terminal of the constant current drive chip PT4115 is connected to the positive terminal of the LED load through an inductor. The negative terminal of the LED load is connected between the sampling resistor and the isolation ground of the isolation power supply module.

[0015] Preferably, the warning light control circuit further includes a control module and a wireless communication module. The control module is coupled to the wireless communication module, and the output terminal of the control module is coupled to the input terminal of the input protection module. The control module includes an STM32F407VGT6 controller, and the wireless communication module includes a WiFi module ESP8266.

[0016] This utility model has the following beneficial effects:

[0017] This invention eliminates the influence of grounding potential difference on the control signal and transmits the signal so that the LED driving current can work stably in a closed loop independent of the vehicle body grounding. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a structural block diagram of the warning light control circuit in this utility model.

[0021] In the diagram: 1. Lamp holder; 2. LED load; 3. Input protection module; 4. Isolation power supply module; 5. Differential signal conversion module; 6. Signal isolation module; 7. Constant current drive module; 8. Control module; 9. Wireless communication module. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] A remote communication vehicle warning light, such as Figure 1 As shown, it includes a lamp holder 1, an LED load 2 mounted on the lamp holder 1, and a warning light control circuit coupled to the LED load 2. The warning light control circuit eliminates the influence of ground potential difference on the control signal and transmits the signal so that the LED drive current works stably in a closed loop independent of the vehicle body ground.

[0029] like Figure 2As shown, the warning light control circuit includes an input protection module 3, an isolation power supply module 4, a differential signal conversion module 5, a signal isolation module 6, a constant current drive module 7, a control module 8, and a wireless communication module 9. The input protection module 3 receives the trailer power supply voltage, control signals, and power ground. The control module 8 is coupled to the wireless communication module 9, and the output terminal of the control module 8 is coupled to the input terminal of the input protection module 3. The control module 8 includes an STM32F407VGT6 controller, and the wireless communication module 9 includes a WiFi module ESP8266. The input terminal of the differential signal conversion module 5 is connected to... The input terminal of the input protection module 3 is connected to the output terminal of the input protection module 3. The output terminal of the isolation power supply module 4 generates an isolated power supply and an isolated ground. The input terminal of the signal isolation module 6 is connected to the output terminal of the differential signal conversion module 5. The output terminal of the signal isolation module 6 uses the isolated ground as a reference ground. The power supply terminal of the constant current drive module 7 is connected to the isolated power supply and the isolated ground. The signal terminal of the constant current drive module 7 is connected to the output terminal of the signal isolation module 6. The output terminal of the constant current drive module 7 drives the LED load 2. The current detection terminal of the LED load 2 is connected to the feedback terminal of the constant current drive module 7.

[0030] The input protection module 3 includes a 3-pin waterproof socket and a TVS diode SMBJ15CA. The first pin of the 3-pin waterproof socket is used to receive the trailer power supply voltage, the second pin of the 3-pin waterproof socket is used to receive the control signal, and the third pin of the 3-pin waterproof socket is used to receive the power ground. The anode of the TVS diode SMBJ15CA is connected to the first pin of the 3-pin waterproof socket, and the cathode of the TVS diode SMBJ15CA is connected to the third pin of the 3-pin waterproof socket.

[0031] The differential signal conversion module 5 includes an LM2903 dual comparator and a TL431 reference source. The first non-inverting input of the LM2903 dual comparator is connected to the second pin of the 3-pin waterproof socket in the input protection module 3 through a first resistor. The first inverting input of the LM2903 dual comparator is connected to the third pin of the 3-pin waterproof socket in the input protection module 3 through a second resistor. The second non-inverting input of the LM2903 dual comparator is connected to the second pin of the 3-pin waterproof socket in the input protection module 3 through a third resistor. The second inverting input of the LM2903 dual comparator is connected to the reference output of the TL431 reference source through a fourth resistor. The anode of the TL431 reference source is grounded to the third pin of the 3-pin waterproof socket in the input protection module 3. The cathode of the TL431 reference source is connected to the first pin of the 3-pin waterproof socket in the input protection module 3 through a fifth resistor. The reference terminal of the TL431 reference source is connected to the first pin of the 3-pin waterproof socket in the input protection module 3 through a sixth resistor. The first and second outputs of the LM2903 dual comparator are both connected to the input of the signal isolation module 6.

[0032] The signal isolation module 6 includes a PC817 optocoupler. The anode of the PC817 optocoupler is connected to the first and second output terminals of the LM2903 dual comparator in the differential signal conversion module 5 through the sixth and seventh resistors. The cathode of the PC817 optocoupler is connected to the third pin of the 3-pin waterproof socket in the input protection module 3. The emitter of the PC817 optocoupler is connected to the isolation ground of the isolation power supply module 4. The collector of the PC817 optocoupler is connected to the isolation power supply of the isolation power supply module 4 through the eighth resistor and outputs an isolation signal.

[0033] The isolated power supply module 4 includes a DC-DC isolated converter, an electrolytic capacitor, and a ceramic capacitor. The Vin+ terminal of the DC-DC isolated converter is connected to the first pin of the 3-pin waterproof socket in the input protection module 3, and the Vin- terminal of the DC-DC isolated converter is connected to the third pin of the 3-pin waterproof socket in the input protection module 3. The Vout+ terminal of the DC-DC isolated converter outputs isolated power, and the Vout- terminal outputs isolated ground. The positive terminal of the electrolytic capacitor is connected to the Vout+ terminal of the DC-DC isolated converter, and the negative terminal of the electrolytic capacitor is connected to the Vout- terminal of the DC-DC isolated converter. The ceramic capacitor is connected between the Vout+ terminal and the Vout- terminal of the DC-DC isolated converter.

[0034] The constant current drive module 7 includes a constant current drive chip PT4115. The power input terminal of the constant current drive chip PT4115 is connected to the isolation power supply of the isolation power supply module 4. The ground terminal of the constant current drive chip PT4115 is connected to the isolation ground of the isolation power supply module 4. The dimming terminal of the constant current drive chip PT4115 receives the isolation signal. The chip select terminal of the constant current drive chip PT4115 is connected to the isolation ground of the isolation power supply module 4 through a sampling resistor. The switching terminal of the constant current drive chip PT4115 is connected to the positive terminal of the LED load 2 through an inductor. The negative terminal of the LED load 2 is connected between the sampling resistor and the isolation ground of the isolation power supply module 4.

[0035] When the vehicle warning light is in operation, it is mainly equipped with a warning light control circuit. Users can connect to the control module 8 via a mobile phone with a wireless communication module 9, and the control module 8 can send control signals.

[0036] Input protection module 3 receives trailer power supply voltage, control signals from the control system, and power ground. When an external control signal arrives, the second pin of the 3-pin waterproof socket inputs the control signal to the two independent channels of the LM2903 dual comparator.

[0037] Meanwhile, the reference terminal of the LM2903 dual comparator adopts a split-rail design. The first inverting input terminal of the LM2903 dual comparator is directly connected to the third pin of the 3-pin waterproof socket, while the second inverting input terminal of the LM2903 dual comparator is connected to a 2.50V±1% precision voltage generated by the TL431 reference source.

[0038] This differential structure allows signal decision to simultaneously reference both the power supply ground potential and the absolute voltage reference, ensuring accurate identification of the effective level of the control signal even with a voltage difference of up to 5V between the power supply ground and the actual vehicle ground. The output of the LM2903 dual comparator drives the anode of the PC817 optocoupler, whose cathode is fixedly connected to the third pin of a 3-pin waterproof socket.

[0039] When the control signal is valid, the output current of the LM2903 dual comparator triggers the infrared diode inside the PC817 optocoupler to emit light, and the secondary phototransistor is turned on by the light, generating a logic signal on the isolation side with the isolation ground as the reference ground.

[0040] The isolated power supply module 4 works synchronously. Its input terminals are connected to the first pin and the third pin of the 3-pin waterproof socket, respectively. Electrical isolation is achieved through a high-frequency transformer. The output terminal generates a pure 5V isolated power supply, which is filtered by electrolytic capacitors and ceramic capacitors to eliminate ripple.

[0041] This isolated power supply establishes an "electrical island" independent of the vehicle's grounding system for subsequent circuits. The isolation signal output from the PC817 optocoupler is directly input to the dimming pin of the PT4115 constant current driver chip. The power supply and ground terminals of the PT4115 constant current driver chip are connected to the isolated power supply and isolated ground, respectively. When the isolation signal is high, the internal MOSFET of the PT4115 constant current driver chip conducts with a constant duty cycle. Current flows from the isolated power supply through the switching pin of the PT4115 constant current driver chip to the inductor, and then drives the LED load 2 to conduct in the forward direction.

[0042] The current from LED load 2 flows through the sampling resistor and returns to the third pin of the 3-pin waterproof socket, forming a completely closed and isolated current loop. The constant current driver chip PT4115 dynamically adjusts the MOSFET conduction time by continuously comparing the voltage of the current sensing pin with the internal 0.1V reference, thus ensuring precise and stable LED current.

[0043] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A remote communication vehicle-mounted warning light, characterized in that, It includes a lamp holder (1), an LED load (2) mounted on the lamp holder (1), and a warning light control circuit coupled to the LED load (2). The warning light control circuit eliminates the influence of ground potential difference on the control signal and transmits the signal so that the LED drive current works stably in a closed loop independent of the vehicle body ground.

2. The remote communication vehicle warning light according to claim 1, characterized in that, The warning light control circuit includes an input protection module (3), an isolation power supply module (4), a differential signal conversion module (5), a signal isolation module (6), and a constant current drive module (7). The input protection module (3) is used to receive the trailer power supply voltage, control signal, and power ground. The input terminal of the differential signal conversion module (5) is connected to the output terminal of the input protection module (3). The input terminal of the isolation power supply module (4) is connected to the output terminal of the input protection module (3). The output terminal of the isolation power supply module (4) generates an isolation power supply and an isolation ground. The input terminal of the signal isolation module (6) is connected to the output terminal of the differential signal conversion module (5). The output terminal of the signal isolation module (6) is referenced to the isolation ground. The power supply terminal of the constant current drive module (7) is connected to the isolation power supply and the isolation ground. The signal terminal of the constant current drive module (7) is connected to the output terminal of the signal isolation module (6). The output terminal of the constant current drive module (7) drives the LED load (2). The current detection terminal of the LED load (2) is connected to the feedback terminal of the constant current drive module (7).

3. A remote communication vehicle-mounted warning light according to claim 2, characterized in that, The input protection module (3) includes a 3-pin waterproof socket and a TVS diode SMBJ15CA. The first pin of the 3-pin waterproof socket is used to receive the trailer power supply voltage, the second pin of the 3-pin waterproof socket is used to receive the control signal, and the third pin of the 3-pin waterproof socket is used to receive the power ground. The anode of the TVS diode SMBJ15CA is connected to the first pin of the 3-pin waterproof socket, and the cathode of the TVS diode SMBJ15CA is connected to the third pin of the 3-pin waterproof socket.

4. A remote communication vehicle-mounted warning light according to claim 2, characterized in that, The differential signal conversion module (5) includes an LM2903 dual comparator and a TL431 reference source; The first non-inverting input of the LM2903 dual comparator is connected to the second pin of the 3-pin waterproof socket in the input protection module (3) through a first resistor. The first inverting input of the LM2903 dual comparator is connected to the third pin of the 3-pin waterproof socket in the input protection module (3) through a second resistor. The second non-inverting input of the LM2903 dual comparator is connected to the second pin of the 3-pin waterproof socket in the input protection module (3) through a third resistor. The second inverting input of the LM2903 dual comparator is connected to the reference output of the TL431 reference source through a fourth resistor. The anode of the TL431 reference source is grounded to the third pin of the 3-pin waterproof socket in the input protection module (3). The cathode of the TL431 reference source is connected to the first pin of the 3-pin waterproof socket in the input protection module (3) through a fifth resistor. The reference terminal of the TL431 reference source is connected to the first pin of the 3-pin waterproof socket in the input protection module (3) through a sixth resistor. The first and second outputs of the LM2903 dual comparator are both connected to the input of the signal isolation module (6).

5. A remote communication vehicle-mounted warning light according to claim 2, characterized in that, The signal isolation module (6) includes a PC817 optocoupler. The anode of the PC817 optocoupler is connected to the first and second output terminals of the LM2903 dual comparator in the differential signal conversion module (5) through the sixth and seventh resistors. The cathode of the PC817 optocoupler is connected to the third pin of the 3-pin waterproof socket in the input protection module (3). The emitter of the PC817 optocoupler is connected to the isolation ground of the isolation power supply module (4). The collector of the PC817 optocoupler is connected to the isolation power supply of the isolation power supply module (4) through the eighth resistor and outputs an isolation signal.

6. A remote communication vehicle-mounted warning light according to claim 2, characterized in that, The isolated power supply module (4) includes a DC-DC isolated converter, an electrolytic capacitor, and a ceramic capacitor. The Vin+ terminal of the DC-DC isolated converter is connected to the first pin of the 3-pin waterproof socket in the input protection module (3). The Vin- terminal of the DC-DC isolated converter is connected to the third pin of the 3-pin waterproof socket in the input protection module (3). The Vout+ terminal of the DC-DC isolated converter outputs isolated power, and the Vout- terminal of the DC-DC isolated converter outputs isolated ground. The positive terminal of the electrolytic capacitor is connected to the Vout+ terminal of the DC-DC isolated converter, and the negative terminal of the electrolytic capacitor is connected to the Vout- terminal of the DC-DC isolated converter. The ceramic capacitor is connected across the Vout+ terminal and the Vout- terminal of the DC-DC isolated converter.

7. A remote communication vehicle-mounted warning light according to claim 2, characterized in that, The constant current drive module (7) includes a constant current drive chip PT4115. The power input terminal of the constant current drive chip PT4115 is connected to the isolation power supply of the isolation power supply module (4). The ground terminal of the constant current drive chip PT4115 is connected to the isolation ground of the isolation power supply module (4). The dimming terminal of the constant current drive chip PT4115 receives the isolation signal. The chip select terminal of the constant current drive chip PT4115 is connected to the isolation ground of the isolation power supply module (4) through a sampling resistor. The switching terminal of the constant current drive chip PT4115 is connected to the positive terminal of the LED load (2) through an inductor. The negative terminal of the LED load (2) is connected between the sampling resistor and the isolation ground of the isolation power supply module (4).

8. A remote communication vehicle warning light according to claim 2, characterized in that, The warning light control circuit also includes a control module (8) and a wireless communication module (9). The control module (8) is coupled to the wireless communication module (9). The output terminal of the control module (8) is coupled to the input terminal of the input protection module (3). The control module (8) includes an STM32F407VGT6 controller. The wireless communication module (9) includes a WiFi module ESP8266.

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