AC-DC hybrid detection circuit for output load of UPS charger

Abstract

The invention provides an AC-DC hybrid detection circuit for an output load of a UPS charger, which comprises an AC detection circuit, a DC detection circuit and an AC-DC switching circuit, wherein the AC detection circuit comprises a diode rectification unit, an output end of the diode rectification unit is connected with an input end of a filtering unit, an output end of the filtering unit is connected with an input end of an H-bridge inverter circuit, and an output end of the H-bridge inverter circuit is connected with an input end of the AC-DC switching circuit; the DC detection circuit comprises a diode rectification unit, an output end of the diode rectification unit is connected with an input end of a filtering unit, an output end of the filtering unit is connected with an input endof a voltage stabilization unit, and an output end of the voltage stabilization unit is connected with an input end of the AC-DC switching circuit; and an output end of the AC-DC switching circuit isconnected with an output load of the UPS charger. The AC-DC hybrid detection circuit provided by the invention for the output load of the UPS charger overcomes deficiencies of the prior art, and caneliminate influences imposed on the measurement by the distributed capacitance through a mode of AC-DC hybrid measurement so as to obtain an accurate load value.

Description

technical field [0001] The invention relates to an AC / DC hybrid detection circuit for output load of a UPS charger, which belongs to the technical field of circuits. Background technique [0002] UPS is the English abbreviation of Uninterruptible Power Supply, which is used to supply power to important electrical equipment in the event of power grid failure. and the inverter to supply DC power; in the state of power grid accident, the battery supplies power to the rear load through the inverter. In some applications, there is a DC load behind the charger. [0003] When in use, the UPS connects the battery (mostly lead-acid maintenance-free battery) with the host, and converts the DC power into the mains through a module circuit such as the host inverter. It is mainly used to supply a single computer, computer network system or other power Electronic devices, such as solenoid valves, pressure transmitters, etc., provide a stable, uninterrupted power supply. When the mains ...

AI Technical Summary

Problems solved by technology

The resistance value measured by this method is relatively small when the distributed capacitance of the line is large, and the corresponding measures can lengthen the time for injecting DC signals. However, due to the different site conditions, the time is difficult to grasp, and the authenticity of the measured value cannot be determined.

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