Continuously adjustable electronic fuse special for photovoltaic combiner box

Abstract

The invention discloses a continuous adjustable electronic fuse specially used for photovoltaic combiner boxes, which comprises an electrical fetcher, a DC regulated power supply, a fixed resistance, an adjustable resistance, a Hall current collector, a miniature solid state relay, a current comparison circuit, an amplifier circuit and a drive circuit. The normally closed contacts of the electrical pickup and the relay are connected in series in the transmission line, and the Hall current collector is set on the periphery of the photovoltaic combiner box transmission cable; The power supply provides the DC working power supply for the electronic fuse; the fixed resistance and the adjustable resistance are connected in series to form a voltage divider circuit, and the end connected with the fixed resistance and the adjustable resistance is connected to the inverting input end of the current comparison circuit, and the Hall current collector The output terminal is connected to the non-inverting input terminal of the current comparison circuit, and the output terminal of the current comparison circuit is sequentially connected to the amplifier circuit and the driving circuit, and the driving circuit drives the relay; the rated current of the electronic fuse can also be continuously adjusted to meet the needs of various circuit protections.

Description

Technical field [0001] The invention relates to the technical field of photovoltaic power generation equipment, in particular to a continuous adjustable electronic fuse dedicated to a photovoltaic combiner box. Background technique [0002] The photovoltaic combiner box is an important equipment of the solar photovoltaic power generation system. The fuse is a protective device installed in the photovoltaic combiner box to prevent short circuits or overloads. At present, the rated current of each specification fuse is not a continuous value, such as 2A, 4A, 6A, 10A, 16A, 20A, etc., which brings difficulties to circuit protection, especially overload protection. If you want to break the circuit at an intermediate amount of the circuit current, such as 18A in the above current range, no matter whether you choose a 16A fuse or a 20A fuse, it will not meet the requirements; in addition, after the fuse is blown, it is still It must be replaced, which undoubtedly increases maintenance ...

AI Technical Summary

Problems solved by technology

At present, the rated current of fuses of various specifications is not a continuous value, such as 2A, 4A, 6A, 10A, 16A, 20A, etc., which brings difficulties to circuit protection, especially overload protection.

If you want to disconnect the circuit at an intermediate amount of circuit current, such as 18A in the above current section, whether you choose a 16A fuse or a 20A fuse will not meet the requirements; It must be replaced, which undoubtedly increases maintenance costs and timeliness

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