Trailer detection circuit compatible with LED lamp flasher
By using a detection circuit composed of PNP transistors and diodes on the trailer, the problem of unreliable detection of LED lights on the trailer was solved, realizing real-time monitoring and fault alerts for trailer lights, thus improving driving safety.
Patent Information
- Application Number
- CN202520134545.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-01-21
AI Technical Summary
The lack of effective detection circuits in the existing technology to ensure that LED lights work properly on trailers results in their operating characteristics being different from those of traditional bulbs, making it impossible to achieve reliable detection and fault alerts.
The detection circuit, composed of PNP transistors and diodes, detects the presence of a trailer by controlling the state of the trailer steering switch. When the steering switch is turned on, it conducts for a few milliseconds to detect the working status of the LED lights, preventing reverse voltage from damaging the controller.
It enables real-time monitoring of trailer lights, timely detection of faults and reminders to the driver for repairs, thereby improving the driving safety of trailers.
Smart Images
Figure CN223821582U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the trailer detection circuit technology field of compatible LED lamp flasher, specifically, a kind of trailer detection circuit of compatible LED lamp flasher. BACKGROUND
[0002] With the continuous progress of science and technology, LED lamp gradually popularizes in trailer lighting field due to its many advantages. LED lamp has the characteristics of high brightness, low energy consumption, long service life, compared with traditional incandescent bulb and halogen bulb, can provide more reliable, more efficient lighting for trailer. However, the working characteristics of LED lamp are different from traditional bulb, which requires a special detection circuit to ensure its normal work.
[0003] For the above problems, there is no effective solution at present. UTILITY MODEL CONTENT
[0004] For the above technical problems in the related art, the utility model provides a kind of trailer detection circuit of compatible LED lamp flasher, which can overcome the above shortcomings of prior art.
[0005] To achieve the above technical purpose, the technical scheme of the utility model is as follows:
[0006] A kind of trailer detection circuit of compatible LED lamp flasher, including PNP triode Q6 and PNP triode Q7, the base of the PNP triode Q6 is connected with left steering trailer control IO by resistance R24, the emitter of the PNP triode Q6 is connected with one end of resistance R73, the other end of the resistance R73 is connected with one end of resistance R65 and the negative pole of diode D22 respectively, the other end of the resistance R65 is connected with the negative pole of diode D23 and one end of resistance R74 respectively by resistance R67, the positive pole of the diode D22 and the positive pole of the diode D23 are connected with trailer detection IO, the collector of the PNP triode Q6 is connected with trailer left steering LED lamp by resistance R93;
[0007] The emitter of the PNP triode Q7 is connected with the other end of the resistance R74, the base of the PNP triode Q7 is connected with right steering trailer control IO by resistance R30, the collector of the PNP triode Q7 is connected with trailer right steering LED lamp by resistance R94.
[0008] Further, the base of the PNP triode Q6 is also connected with 24V power supply by resistance R18.
[0009] Further, the resistance R65 and the resistance R67 are also connected with 24V power supply.
[0010] Furthermore, the positive terminals of diodes D22 and D23 are both connected to a 24V power supply via resistor R76.
[0011] Furthermore, the base of the PNP transistor Q7 is also connected to a 24V power supply via resistor R26.
[0012] The beneficial effects of this invention are as follows: This invention controls the output of the trailer detection circuit through two transistors. When the turn switch is not open, the current flowing through the LED is zero, and the LED will not light up. Only when the turn switch is open, the transistors conduct for a few milliseconds, thereby detecting the presence of the trailer. Simultaneously, diodes prevent reverse voltage from damaging the controller. This trailer detection circuit, compatible with LED light flashers, can monitor the working status of the trailer lights in real time, promptly detect faults, and remind the driver to perform maintenance, thereby improving the driving safety of the trailer. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1 This is a schematic diagram of the circuit structure of the trailer detection circuit compatible with LED light flashers according to an embodiment of the present invention.
[0015] In the diagram: 1. PNP transistor Q6; 2. Left turn trailer control I / O port; 3. Right turn trailer control I / O port; 4. Diode 1; 5. Trailer detection I / O port; 6. PNP transistor Q7; 7. Diode 2; 8. Trailer left turn LED light; 9. Trailer right turn LED light; 10. Resistor R24; 11. Resistor R73; 12. Resistor R65; 13. Resistor R67; 14. Resistor R74; 15. Resistor R30; 16. Resistor R94; 17. Resistor R93; 18. Resistor R18; 19. Resistor R76; 20. Resistor R26. Detailed Implementation
[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.
[0017] like Figure 1As shown, a trailer detection circuit compatible with LED light flashers according to an embodiment of this utility model includes PNP transistors Q61 and Q76. The base of PNP transistor Q61 is connected to the left turn trailer control IO2 via resistor R2410. The emitter of PNP transistor Q61 is connected to one end of resistor R7311. The other end of resistor R7311 is connected to one end of resistor R6512 and the cathode of diode D227. The other end of resistor R6512 is connected to the cathode of diode D234 and one end of resistor R7414 via resistor R6713. The anodes of diode D227 and diode D234 are both connected to trailer detection IO port 5. The collector of PNP transistor Q61 is connected to the trailer left turn LED light 8 via resistor R9317.
[0018] The emitter of the PNP transistor Q76 is connected to the other end of the resistor R7414, the base of the PNP transistor Q76 is connected to the right turn trailer control I / O port 3 through the resistor R3015, and the collector of the PNP transistor Q76 is connected to the trailer right turn LED light 9 through the resistor R9416.
[0019] The base of the PNP transistor Q61 is also connected to a 24V power supply via resistor R18. Resistors R65 and R67 are also connected to a 24V power supply. The anodes of diodes D224 and D237 are also connected to a 24V power supply via resistor R76. The base of the PNP transistor Q76 is also connected to a 24V power supply via resistor R26.
[0020] Preferably, resistors R24, R65, R67, and R30 are all 5100Ω, resistors R18 and R26 are 47000Ω, resistors R73 and R74 are 1000Ω, resistor R76 is 20000Ω, resistors R93 and R94 are 39000Ω, transistors Q6 and Q7 are 2N5401, and diodes D22 and D23 are S07M.
[0021] To facilitate understanding of the above-mentioned technical solutions of this utility model, the following detailed description of the above-mentioned technical solutions of this utility model is provided through specific usage methods.
[0022] In practical use, according to the trailer detection circuit compatible with LED light flashers described in this utility model, the trailer turn indicator light and the trailer turn LED light are driven separately. The trailer turn indicator light serves as an indicator; that is, when the trailer turn LED light is damaged, the trailer turn indicator light flashes at a double frequency to alert the driver. The trailer turn LED light is connected in series with this circuit, and the trailer turn indicator light is driven by a separate driver circuit. Left turn trailer control IO port 2, right turn trailer control IO port 3, and trailer detection IO port 5 are the pin control terminals of the microcontroller. Trailer detection IO port 5 is set to a high-level input. When the turn switch is closed, left turn trailer control IO port 2 and right turn trailer control IO port 3 output a high level, and PNP transistors Q61 and Q76 are cut off. At this time, the current of the trailer LED light is zero, and the LED light will not light up. Only when the turn switch is open will the left turn trailer control I / O port 2 and right turn trailer control I / O port 3 output a low level for approximately 2 milliseconds, briefly turning on PNP transistors Q61 and Q76. If trailer detection I / O port 5 goes low, it indicates the presence of a trailer. If a trailer is present, the trailer LED and trailer indicator light will flash normally. If one turn trailer LED is damaged, the corresponding trailer indicator light will flash at a double frequency. If the trailer detection I / O port remains high, it indicates the trailer is not present, and the trailer indicator light will not flash.
[0023] In summary, by utilizing the above-described technical solution of this utility model, the output of the trailer detection circuit is controlled by two transistors. When the turn switch is not open, the current flowing through the LED light is zero, and the LED will not light up. Only when the turn switch is open, the transistors conduct for a few milliseconds to detect the presence of the trailer. Simultaneously, diodes prevent reverse voltage from damaging the controller. This trailer detection circuit, compatible with LED light flashers, can monitor the working status of the trailer lights in real time, promptly detect faults, and remind the driver to perform maintenance, thereby improving the driving safety of the trailer.
[0024] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A trailer detection circuit compatible with LED light flashers, characterized in that, Includes PNP transistors Q6 (1) and Q7 (6). The base of PNP transistor Q6 (1) is connected to the left turn trailer control IO (2) through resistor R24 (10). The emitter of PNP transistor Q6 (1) is connected to one end of resistor R73 (11). The other end of resistor R73 (11) is connected to one end of resistor R65 (12) and the negative terminal of diode D22 (7) through resistor R67 (13). The other end of resistor R65 (12) is connected to the negative terminal of diode D23 (4) and one end of resistor R74 (14) through resistor R67 (13). The positive terminals of diode D22 (7) and D23 (4) are both connected to trailer detection IO port (5). The collector of PNP transistor Q6 (1) is connected to the trailer left turn LED light (8) through resistor R93 (17). The emitter of the PNP transistor Q7 (6) is connected to the other end of the resistor R74 (14), the base of the PNP transistor Q7 (6) is connected to the right turn trailer control IO port (3) through the resistor R30 (15), and the collector of the PNP transistor Q7 (6) is connected to the trailer right turn LED light (9) through the resistor R94 (16).
2. The trailer detection circuit compatible with LED light flashers according to claim 1, characterized in that, The base of the PNP transistor Q6 (1) is also connected to a 24V power supply through a resistor R18 (18).
3. The trailer detection circuit compatible with LED light flashers according to claim 1, characterized in that, The resistors R65 (12) and R67 (13) are also connected to a 24V power supply.
4. The trailer detection circuit compatible with LED light flashers according to claim 1, characterized in that, The positive terminals of diodes D22 (4) and D23 (7) are also connected to a 24V power supply through resistor R76 (19).
5. The trailer detection circuit compatible with LED light flashers according to claim 1, characterized in that, The base of the PNP transistor Q7 (6) is also connected to a 24V power supply through a resistor R26 (20).