Intelligent detection unit with direct-current arcing detection function and junction box

Abstract

The invention discloses an intelligent detection unit with a direct-current arcing detection function and a junction box. The intelligent detection unit includes a current detection unit as well as a high-pass filtering circuit, a rectifying and filtering circuit and a comparison and locking circuit which are arranged sequentially between the current detection unit and a single-chip microcomputer, the single-chip microcomputer, a key display unit and a network communication unit; the key display unit and the network communication unit are connected with the single-chip microcomputer; the input end of the high-pass filtering circuit is connected with the output end of the current detection unit; the output end of the high-pass filtering circuit is connected with the input end of the rectifying and filtering circuit; the output end of the rectifying and filtering circuit is connected with one input end of the comparison and locking circuit; and the output end of the comparison and locking circuit is connected with the single-chip microcomputer. With the intelligent detection unit adopted, direct-current arcing signals in the junction box can be detected fast in real time.

Description

technical field [0001] The invention relates to arc detection, in particular to an intelligent detection unit and a combiner box with a DC arc detection function. Background technique [0002] In order to reduce the connection lines between the photovoltaic array or other DC sources and the inverter, and to facilitate maintenance in the future, it is usually necessary to add a combiner box between the photovoltaic array or other DC sources and the inverter to connect the multi-channel The DC input is combined into one output, which is convenient for inverter wiring. [0003] DC arc detection technology is an increasingly popular topic in photovoltaics in recent years. When loose contacts, poor contact, damp wires, and insulation rupture occur in the combiner box, arcs may occur on the DC line, and the high temperature generated by the arc can easily lead to The adjacent material reaches the ignition point and a fire occurs, that is, there is a potential safety hazard of DC ...

AI Technical Summary

Problems solved by technology

[0003] DC arc detection technology is an increasingly popular topic in photovoltaics in recent years. When loose contacts, poor contact, damp wires, and insulation rupture occur in the combiner box, arcs may occur on the DC line, and the high temperature generated by the arc can easily lead to The adjacent material reaches the ignition point and a fire occurs, that is, there is a potential safety hazard for DC arcing

In the prior art, the Hall sensor is used for DC arc detection, but its scanning frequency for current detection is relatively low, the communication speed is slow, and the hardware cannot meet the needs of arc detection.

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