Short-circuit protection device and short-circuit protection method for DC bus of UPS (Uninterrupted Power Supply)

Abstract

The invention discloses a short-circuit protection device and a short-circuit protection method for a DC bus of a UPS (Uninterrupted Power Supply). The device comprises a short-circuit protection circuit and a digital signal processor electrically connected with the short-circuit protection circuit. The short-circuit protection circuit is used for blocking an IGBT driving signal from a PWM controller and outputting a bus short-circuit signal to the digital signal processor when a DC bus of a UPS is short-circuited. The digital signal processor is used for, after receiving the bus short-circuit signal, closing the PWM controller, and switching the UPS to bypass output. According to the short-circuit protection device and the short-circuit protection method for a DC bus of a UPS, by adopting a mode of combining hardware protection and software protection, the UPS equipment can be protected at the moment when the bus is short-circuited, the cost of pure hardware protection can be greatly reduced, and the circuit cost is irrelevant to the power level of the UPS. The short-circuit protection device and the short-circuit protection method have high market popularization values.

Description

technical field [0001] The invention relates to the technical field of circuit protection, in particular to a UPS DC bus short-circuit protection device and a short-circuit protection method. Background technique [0002] UPS (Uninterruptible Power Supply, uninterruptible power supply) refers to the power supply equipment that will not be interrupted by short power outages and can always supply high-quality power, thereby effectively protecting precision instruments. It also has the function of stabilizing voltage, similar to a voltage stabilizer. Uninterruptible power supplies have been widely used in mining, aerospace, industry, communications, national defense, hospitals, computer business terminals, network servers, network equipment, data storage equipment and other fields. [0003] Since the UPS is a very important backup power supply device, it must be equipped with corresponding short-circuit protection measures to protect it when in use, so as to avoid damage to the...

AI Technical Summary

Problems solved by technology

At present, there are two main methods of DC line short-circuit protection for UPS, namely, the software protection method of blocking the switch tube drive and the hardware protection method of series fuses; among them, the cost of the software protection method is low, but there is a certain delay in the detection of short circuits. When the actual short-circuit protection effect is poor; while the hardware protection method of the series fuse has the advantages of fast protection action and good effect, but the cost is high, especially the higher the power level of the UPS, the higher the cost

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