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What are the LED switching power supply important protected mode?
From: Huatuo  Date: 2017-04-18 14:42:23
LED switching power supply protection mode is as follows:
1,Over current circuit, usually need to know when a short-circuit, overload or load control circuit failure accident happens, can cause excessive current through the switch tube, pipe increases power consumption, fever. If do not have over-current protection device, power switch tube has the chance to damage, regulating circuit failure, can also cause LED over-current damage. Over-current protection is usually through sampling resistor or hall sensors, such as testing, comparison, thus achieve protection. Their disadvantage is that the shape of large volume, high cost.
2, Overshoot circuit: general steady flow during start-up and shutdown switch power supply is easy to cause the current overshoot, LED load for ms level such as the current overshoot is not allowed, so the impact of the instantaneous large-current chance to damage the LED device.
3, Over-voltage circuit: steady flow type power supply if the load circuit, current detection of resistance at the ends of the voltage drop to zero, once a given value is not zero, controller will make the output voltage to accelerate the rise to the highest, for connected to the load when poor contact is very dangerous. For LED, semiconductor refrigeration load, over voltage occurs, the first requirement is to protect the load, and then the protection switch power tube.
4, Direct circuit: switching power supply common topology is a half bridge and bridge, "through" the harm of it will be quite big, straight is the same bridge arm at the same time two transistor conduction phenomenon at the same time. Usually in converter, switching power supply are susceptible to interference, in turn, cause the pass-through, excessive through current can damage for the inverter power electronic devices. If there is a direct phenomenon, we must be detected and should immediately shut off the drive as soon as possible, to avoid the accumulation of excessive heat switching device of PN junction and cause burn out.
In order to solve the above problems, Huatuo company after years of research and development testing, a conclusion, we can use two ways to use at the same time to achieve the purpose of protection. Such as two-way TVS were placed for instantaneous impulse voltage protection, methods to solve more can ask Chauncy@huatuo168.com. For the LED switching power supply protection way, we can only briefly. As a switching power supply development manufacturer for many years, we think the most important still is the quality of the products and product after-sales service, this is also Huatuo for many years the tenet of the company.

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