Switching device for ups power supply

Abstract

The invention discloses a switching apparatus of a UPS power supply. The apparatus comprises a commercial power supply module, an external power supply module, a cell power supply module, a cell charging module, a MCU control module, a switching control module and a host power supply output module. According to the apparatus of the invention, the MCU control module is used to monitor working states of the commercial power supply module, the external power supply module, the cell power supply module and the cell charging module in real time and synchronously carry out power-down waveform identification and peak value voltage detection. When the commercial power supply is performed, the host power supply output module is controlled to carry out voltage reduction on the commercial power so that the commercial power is converted into a reference power supply and is output. When the MCU control module determines that the commercial power is off through the power-down waveform identification and the peak value voltage detection, a switching instruction is output to the switching control module so that the switching among the commercial power supply module, the external power supply module and the cell power supply module is realized. Alternating current power down can be accurately identified in a short time and a switching signal is provided timely. A UPS multipath priority switching requirement is reached.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a switching device for UPS power supplies. Background technique [0002] UPS (Uninterruptible Power System, uninterruptible power supply) power supply is a constant voltage and constant frequency uninterruptible power supply with an energy storage device and an inverter as the main component, which is used to provide uninterrupted power supply to electronic equipment. When the mains power is interrupted (accidental power outage), the UPS power supply immediately converts the power of the battery inside the machine to continue to supply 220V AC to the load through the method of inverter conversion, so that the load can maintain normal operation and protect the load software and hardware from damage. At present, the commonly used UPS power supply in the market is an online reserve power supply. There are only 2 switching circuits (220V AC and built-in battery). The advantag...

AI Technical Summary

Problems solved by technology

And in the existing AC power failure identification methods, most of them use the isolation circuit to take the AC signal, and use the method of judging the rate and amplitude of the AC power drop to identify the basis of the AC power failure. When the grid voltage fluctuates, such methods have a short time in the reflection time. Misjudgment

In this way, it will not be possible to realize fast and accurate power-off judgment, and if the switching is not timely, the power-consuming equipment will be shut down due to power shortage, data loss will affect the work, or the power-consuming equipment will work abnormally

Images