黑暗触发汽车安全公园灯电路

In this post we discuss a circuit concept for enabling cars with an add-on automatic safety park light which triggers during night and signals the position of the car and consequently prevents a mistaken collision or dashing by another vehicle. The design ensures minimum consumption and relatively higher brightness for the involved LED lights. The idea was requested by Mr. Ankit.

技术规格

请在以下电路上建议

1。A 12V circuit is desired to be designed to light a 12V LED, such that it lights the LED in pulses (that is to say that the current to led is sent intermittently (say once every 1 minute roughly) and the current pulse stays for a brief duration (say 5 seconds roughly))

2.因此，LED灯每1分钟反复一次，每次保持大约5秒。

3.还希望上面的电路在黑暗时自动开始工作，并在大气照明时停止。

4。The above circuit is intended to be used in a parked car so that the LED keeps blinking in the rear when car is parked in dark and the cycle stops when it is day time.

5.此外,正如所料,当汽车在驱动night, its rear red lights will be on and the blinking LED will no longer be needed. So, it is desired that in some way a 12V +ve signal feeded to the circuit from rear red lights (when glowing) should stop the blinking cycle of the circuit.

拟议的黑暗触发汽车安全公园的灯光如下所示……大多数夜间，由于房屋内部空间的短缺，汽车被路边停放。

由于缺乏路灯或缺乏电力供应，通常非常黑。因此，有时行人，周期或里克肖或几辆车辆没有大灯撞到汽车。

按照上述要求，间歇性的脉动LED将标志着汽车的存在，同时又没有电池排水不适。

当白天有周围的光线或汽车驾驶时，不需要这种闪烁的光线，因此LDR可能会关闭电路，还可以在驾驶12V +VE时从汽车后灯上关闭。闪烁的领导。主席先生，您将在上述巡回赛的上述方面提供帮助。

Dr Ankit

该设计

根据上述电路详细信息，可以制作所需的黑暗触发停车场灯电路。

整个电路围绕一个IC 4093构建，门N1至N4来自该IC，该IC适当配置了相关的被动组件。

N1 is wired as darkness sensor through the connected LDR across its input and ground. The pot determines the sensitivity control can be set for triggering N1 at the desired darkness level.

N2 is wired as a PWM control frequency generator stage, the associated pot can be used for setting the required degree of ON or OFF time to the LEDs and consequently control their average brightness and consumption.

N3 is used like a buffer, whose output is connected with the base of the driver transistor TIP122 which responds to the fed PWMs and drives the LEDs with the corresponding amount of brightness.

门N4的位置可以停止TIP122传导，并且每当检测到尾灯时，LED照明，这意味着在尾灯灯泡打开时，建议的黑暗触发了公园的灯光。

另一方面，当检测到黑暗时，N1输入的负数为负，迫使其输出升高，该高信号会抑制N2的振荡动作，并导致其输出量低。

With N2 output is low, N3 output is accordingly prompted to go high, which in turn switches ON the TIP122 transistor and the LEds. This positioned is held in the LED switched ON position (and flashing) until the darkness persists and dawn sets in, or/and the tail lights are switched ON.