Power distribution cabinet output short circuit detection circuit, power distribution cabinet and power supply system

By setting up a short-circuit detection circuit at the output of the distribution cabinet between the power grid and the load, and utilizing a DC voltage source and a voltage divider resistor network, combined with a voltage or current detection module, the problem of inaccurate detection results in the prior art is solved, and accurate detection of short circuits on the load side is achieved.

CN224553463UActive Publication Date: 2026-07-24SIGENERGY TECHNOLOGY (JIANGSU) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SIGENERGY TECHNOLOGY (JIANGSU) CO LTD
Filing Date
2025-07-11
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing technologies have problems with inaccurate detection results when detecting whether there is a short circuit on the load side. In particular, when the load side is under full load short circuit, AC voltage injection can cause false alarms, and when DC voltage injection occurs, the inverter short circuit protection can cause the detection current to be too small to detect.

Method used

A short-circuit detection circuit is set at the output of the distribution cabinet between the power grid and the load. A DC voltage source is used to provide the working voltage for the sub-detection circuit. The voltage is divided by the first resistor, the second resistor and the third resistor. Combined with the voltage detection module or the current detection module, it is determined whether there is a short circuit on the load side.

Benefits of technology

It enables accurate detection of short circuits at the load end before grid connection, ensuring the accuracy of detection results and avoiding equipment damage caused by false alarms.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224553463U_ABST
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Abstract

The utility model discloses a kind of power distribution cabinet output end short circuit detection circuit, power distribution cabinet and power supply system, it is related to power electronics technical field;The power distribution cabinet output end short circuit detection circuit includes: control unit and at least one sub-detection circuit, each sub-detection circuit connects one to be measured loop;Each sub-detection circuit includes first, second and third relay, power supply, direct current voltage source, voltage or current detection module, first, second and third resistance;Wherein, power supply is powered for relay, direct current voltage source provides operating voltage for sub-detection circuit, first, second and third resistance constitute voltage dividing network, when sub-detection circuit works, voltage or current detection module can be detected to a voltage or current value after voltage dividing by voltage dividing network, and then whether load end is short-circuited based on voltage or current value is judged.The power distribution cabinet output end short circuit detection circuit of the utility model can ensure the accuracy of detection result.
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