After the LED explosion-proof light is turned off, the light will flash, even when the switch is connected to the live wire. Reasons:
This is because after the neutral line N is grounded, it does not show a good 0V, that is, the neutral point shift occurs, which makes the neutral line N have a potential difference to the ground, and then there will be a voltage in the line. The induced voltage is formed, and at the same time, it will flash after the switch is turned off. At this time, as long as the neutral and live wires on the explosion-proof light switch are all disconnected, it can return to normal. Or just connect the light bulb's line directly to the ground wire.
Afterglow occurs, that is, there will be weak light after the LED is turned off, and it will take a long time to turn off:
The reason for this phenomenon is that under normal circumstances, the LED explosion-proof light is not directly powered by the neutral wire and the live wire, and a small DC transformer will be added between the two. There is always a residual weak voltage, and once this voltage exceeds 0.37V (the minimum induced voltage of the LED light), the light will always be on, until the residual voltage is less than 0.37V, it will go out.
After the explosion-proof light is turned off, there is always a weak light phenomenon. The possible reasons are as follows:
1. It is possible that the purchased lamp itself is the kind with indicator light, and the knowledge is not paid attention to;
2. If it is not the first case, it may be that the circuit of the LED light is slightly leaking or there is a small light bulb on the switch;
3. Another possibility is that the switch of the LED explosion-proof light is connected to the neutral wire. At this time, it is only necessary to change the switch to the control live wire;
Additional knowledge: What are induction waves:
1. In a closed loop, the current in which the generated magnetic field hinders the change of the magnetic flux of the original magnetic field is called an induced radio wave;
2. The principle of generating induced current: The conductor placed in the changing magnetic flux is closed into a loop, and the electromotive force will drive the electrons to flow, forming an induced current (induced current 0). In layman's terms, when a part of the conductor of the closed loop is in the magnetic field to cut the magnetic field line, the total magnetic flux of the closed loop will definitely change, and an induced electromotive force will be generated in the closed loop, and Ronger will generate a current. become the induced current.
After understanding the concept of induced current, do you have a certain understanding of the reasons why the LED explosion-proof lamp will be entangled in the above situation: it is like the metal electrical appliances of your Motong Electric, although it is insulated from the power supply, but it is always numb to the touch. of. This means that when you cut off the power, there is still a little induced electricity in the circuit of the electrical appliance. The solution to this phenomenon is also very simple. Connect a resistor in parallel with the LED terminal to discharge the residual current.
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