Method for derating in overheating and over-voltage protection of big power switch power supply

Abstract

The invention discloses a circuit and a method for derating in the overheating and over-voltage protection of a big power switch power supply. The method comprises the following steps of: acquiring voltage and temperature signals of an operating big power switch power supply; comparing the obtained voltage and temperature signals with the set voltage and temperature protection values; and if the voltage and temperature acquisition signal values of the tested operating big power switch are over the set voltage and temperature protection values respectively, namely the overheating or voltage protection occurs, gradually reducing the real-time working power of the operating big power switch power supply by using 10 percent of original working power as a derating value until the overheating or voltage protection does not occur any more. When the overheating or voltage protection occurs, by using the derating method, under a condition of not affecting operation of the big power switch power supply, the big power switch power supply is protected in real time, and the use efficiency of the big power switch power supply is obviously improved.

Description

technical field [0001] The invention relates to the field of overheating and overvoltage protection of high-power switching power supplies, and in particular to a derating circuit and method for overheating and overvoltage protection of high-power switching power supplies. Background technique [0002] At present, the high-power switching power supply on the market will directly shut down to protect the equipment when overheating or overvoltage protection occurs, so that the user cannot continue to use the equipment. For example, a high-power induction heating power supply may cause the heating object to stop heating due to protection, resulting in the heating object not being used normally and bringing economic losses to the user; another example is that if the electric welding machine is welding, the welding rod is suddenly wasted due to protection; the same reason , The charger cannot continue to charge due to protection, resulting in low efficiency. [0003] Overheat pr...

AI Technical Summary

Problems solved by technology

[0003] Overheat protection generally occurs when the ambient temperature is too high, the heat exhaust fan of the equipment cannot work normally due to a fault, and the equipment is not well ventilated (such as the air filter is dusty and not cleaned in time, the air inlet and outlet are blocked, etc.); The voltage of the power supply system is abnormal, or the power supply voltage of the generator is unstable, and the internal failure of the equipment itself is caused by factors such as

If overheating or overvoltage protection occurs when the user is using it, it will generally affect the quality of the processed product

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