Auxiliary power supply circuit of uninterruptible power supply

Abstract

The invention discloses an auxiliary power supply circuit of an uninterruptible power supply, the circuit is simple, and design is reasonable. The circuit comprises a utility power input unit, a battery input unit, a controllable switch and a multipath output translator unit, wherein the input end of the utility power input unit is coupled with a utility power feed end, and the output end of the utility power is coupled with the input end of the controllable switch; the input end of the battery input unit is coupled with a battery supply end, the output end of the battery input unit is coupled with the input end of the multipath output translator unit; and the controllable switch is connected with the utility power input unit and the multipath output translator unit. The circuit provided by the invention can directly supply power to utility power and a battery, the startup can be realized only by connection of the battery or the utility power; a normally closed controllable switch is used, and utility power voltage and battery voltage superposed high pressure generated in input capacitance of auxiliary power supply is avoided, design difficulty of a transformer and the lectotype difficulties of different components on the loops are reduced, and the cost is reduced.

Description

technical field [0001] The invention belongs to the field of power supply, in particular to an auxiliary power circuit of an uninterruptible power supply. Background technique [0002] In order to ensure the reliability of high-power UPS, a stable auxiliary power supply is the prerequisite for the normal operation of the UPS. The reliability of the auxiliary power supply is the basis of a high-reliability UPS. The auxiliary power supply in large-capacity UPS equipment is often directly connected to the power grid, and the input voltage At the same time, it also bears various transient processes of the power grid such as transients, surges, and lightning strikes. Therefore, the working environment is very harsh. In the uninterruptible power supply of the power range below 10KVA, it is usually divided into two types: long-term machine and standard machine. The long-term machine is generally an external large-capacity battery pack, while the standard machine is a built-in smal...

AI Technical Summary

Problems solved by technology

At present, there are also manufacturers who choose the auxiliary power supply to only take power from the battery power supply terminal. However, to realize the function of starting up with only the mains power supply, an AC / DC converter circuit must be built in, which greatly increases the cost.

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