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How is LED explosion-proof lighting protected?
LED explosion-proof lighting and its principle is the same with the principle of explosion-proof lighting, except that the lamp beads are LED lamp beads, which is to prevent the ignition of surrounding explosive mixtures such as explosive dust environment, explosive gas environment, gas gas, etc. A specific fixture. What are the protective measures of LED explosion-proof lights?
The actual working LED is based on a current limit of 20 mA. However, the current is usually increased due to various reasons during use. If the correct protective measures are not taken, the increased current exceeds a certain level. The time and magnitude will be broken afterwards. For the protection of the LED, we first need to use the fuse, but the fuse is a one-time, and the reaction speed is very slow, so that the effect is also very inconvenient in the process of use, so the fuse is not suitable Used in finished products such as LEDs.
We generally can choose to automatically restore the fuse PTC, and then through experiments, a more reliable method of use is to make the PTC heat lamp beads farther. In the actual circuit we can choose two ways:
1. Shunt protection: general LED and so on is divided into many serial branches, such as 24V, can use seven LED light beads in series and then add a resistor, the current is generally seventeen Up to nineteen milliamperes, depending on the need, an integral multiple of seven light beads can be selected to combine to form a whole lamp. In front of each branch, a PTC element is added for protection. The advantage of this method is the reliability of the protection. Better and more accurate.
2. Overall protection: In front of all the lamp beads are connected a PTC element, for the protection of the entire lamp, this method is relatively simple to handle, does not occupy the volume. This method is quite satisfactory for household products.