Continuously adjustable electronic fuse special for photovoltaic combiner box

Abstract

The invention discloses a continuously adjustable electronic fuse special for a photovoltaic combiner box. The continuously adjustable electronic fuse comprises an electricity taking device, a direct-current stabilized power supply, a fixed resistor, an adjustor resistor, a Hall current collector, a micro solid-state relay, a current comparison circuit, an amplification circuit and a drive circuit; a normally-closed contact of the electricity taking device and a normally-closed contact of the relay are connected to a power transmission line in series, and the Hall current collector is arranged at the periphery of a power transmission line of the photovoltaic combiner box in a sleeving mode; the output end of the electricity taking device is connected with the input end of the direct-current stabilized power supply, and the direct-current stabilized power supply supplies a direct-current working power supply to the electronic fuse; the fixed resistor and the adjustable resistor are connected in series to form a voltage division circuit, the end, connected with the adjustable resistor, of the fixed resistor is connected with the inverted input end of the current comparison circuit, the output end of the Hall current collector is connected with the in-phase input end of the current comparison circuit, the output end of the current comparison circuit is connected with the amplification circuit and the drive circuit sequentially, and the drive circuit drives the relay; the rated current of the electronic fuse can be continuously adjusted to meet the requirements of various circuit protection.

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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