Parallel connection protection circuit for solar module

Abstract

The invention discloses a parallel connection protection circuit for a solar module, which comprises a field effect transistor, a driving module and a protection module, wherein the field effect transistor is used for reverse current limiting; the driving module is used for driving the field effect transistor; the protection module is used for preventing the gate of the field effect transistor from high-voltage breakdown; the driving module is connected with the protection module to form a control module of the parallel connection protection circuit which is connected in parallel with the anode and cathode of the output of the solar module; the gate of the field effect transistor is connected between the driving module and the protection module, the source of the field effect transistor is connected with the cathode of the solar module, and the drain of the field effect transistor is forms the anode and cathode of the output of the protected solar module with the anode of the solar module; and the protection module may be a resistor, a diode string, a voltage stabilizing diode or the like. The novel parallel connection protection circuit provided by the invention greatly reduces the loss of a solar module protection circuit, improves the power generating capacity of a solar cell in the morning, in the evening and in cloudy and rainy days, is simply structured, highly universaland low in cost, and can promote the popularization of solar energy application.

Description

technical field [0001] The invention relates to a circuit design of a solar application module, in particular to a parallel protection circuit for preventing current backflow from damaging the solar module, increasing the output power of the solar module, and fault detection and indication modules. Background technique [0002] As a renewable new energy source, solar energy is more and more favored by people, and it is widely used in people's daily life and work. The most direct application is to convert solar energy into electrical energy. Solar cells receive the sun's radiant energy during the day and convert and output it. However, due to the weakening of light radiation in the morning, evening or rainy days, the output voltage of solar cells decreases. If there is no solar energy The protection circuit of the battery, the supplementary current stored by the battery or provided by other power sources in the output line will flow back to the solar battery, resulting in sho...

AI Technical Summary

Problems solved by technology

However, because the forward voltage drop of the diode is 0.7V, the output voltage and efficiency are reduced, and because the effective voltage output of the solar cell is reduced, the effective power generation time during the day is shortened, and the actual output power of the solar energy is greatly reduced.

According to the calculation of 12V solar cells, the annual power generation will lose about 11%, which increases the cost of solar photovoltaic power generation, thus limiting the promotion of new energy

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