Steering lamp fault detection circuit

Abstract

The invention discloses a steering lamp fault detection circuit. The steering lamp fault detection circuit is simple, efficient, low in power consumption, high in noise immunity, and capable of accurately detecting damage of a single LED in real time and feeding back a fault signal to a vehicle body ECU. According to the steering lamp fault detection circuit, the constant current source topology built by a small number of discrete devices is adopted to replace a traditional photoelectric sensor to convert the fault signal into a voltage signal of about 100 mV to a vehicle body control module, and an alarm is given, so that the problem that traveling hidden dangers are caused due to the fact that a driver is not informed of damage of a steering lamp is avoided. A traditional complex sensor detection circuit with high cost is changed, and fault detection is achieved for various series-parallel connection mixed modes of steering lamp LEDs with low cost.

Description

technical field [0001] The invention relates to the technical field of auto parts detection, in particular to a fault detection circuit for LED turning lights. Background technique [0002] With the improvement of LED technology and the reduction of cost, the application of LED in car lights is becoming more and more common. Almost all kinds of car lights have LED applications, and many car turn signals use LEDs. The law stipulates that the turn signals of automobiles must be checked at all times to avoid driving hazards caused by drivers not knowing that the turn signals are damaged. The detection of the traditional bulb turn signal is realized by measuring the on-off of its DC current, while the LED turn signal is usually mixed in series and parallel. Therefore, when a single LED lamp is damaged, the current of the entire turn signal may not drop much. At the same time, because the LED current is greatly affected by temperature, the detection error by simply using the cu...

AI Technical Summary

Problems solved by technology

So when a single LED lamp is damaged, the current of the entire turn signal may not drop much

At the same time, because the LED current is greatly affected by temperature, the error of simply using the current to detect is large, and false alarms will occur.

At present, many manufacturers reduce the difficulty of detection by connecting LED lights in series, but this causes the phenomenon that if one LED is damaged, the entire turn signal cannot be used, and the safety of driving cannot be guaranteed, and the series and parallel connection of LEDs are lost. Mixed advantages

To sum up, the imperfect detection method of LED turn signal limits the application of LED in turn signal

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