Lightning protection system and the Current Fuse decoder
Brand good decoder is equipped with a lightning protection system and the Current Fuse, in response to lightning and power short circuit accident from happening.
Most of the simple pursuit of quality of decoder is often tinged with lightning protection system, main is to prevent induction lightning damage to the decoder through the RS485 bus. Standard of the lightning protection system the price will be higher than the decoder itself several times, so usually lightning protection system design is relatively simple and easy.
Lightning protection is partly done by two lightning protection diode, can prevent the induction lightning damage of 10 milliseconds 600 w, basically can resist common induction lightning attacks. When induction lightning energy than lightning protection diode under limit, lightning protection diode will burn, induction lightning energy absorption at the same time, protect the internal decoder device and power transformer are destroyed. After the detonator was burned down, will take off after the detonator, the decoder can work normally, but is not have lightning protection function.
Due to the complexity of decoder use environment, being struck by lightning often happen, suggest choosing decoder, choose products with a lightning protection system.
There are basically two Current Fuse bigger role in decoder:
1. Prevent the 220 v power supply in the construction process of short circuit or cause harm to people, when the 220 v power supply short circuit or people get an electric shock the fuse will automatically cut off the 220 v power supply, ensure the safety of personnel and equipment. Usually 220 v fuse will design a transparent plastic shell, prevent the risk of electric shock caused by the fuse metal joint.
2. To prevent camera short-circuit power transformer burned, this is usually not fuse shell.
In some design more perfect decoder, have 3 fuse, added a foreign output ac 24 v output protection, prevent yuntai decoder caused by short circuit devices and internal power transformer burned.