Over-temperature state indication type photovoltaic junction box based on thermistor temperature measurement

Abstract

The invention discloses an over-temperature state indication type photovoltaic junction box based on thermistor temperature measurement. The junction box comprises a diode string, photovoltaic cable ports, a thermistor temperature measurement circuit module and an LED over-temperature state indication circuit module, wherein the diode string comprises a plurality of diodes in serial connection in the same direction, the diodes are as many as photovoltaic batteries, the diodes and the photovoltaic batteries correspond to each other and are in parallel connection, the two photovoltaic cable ports are connected to the two ends of the diode string respectively, the thermistor temperature measurement circuit module is respectively connected with lines of the diodes in the diode string, the output end of the thermistor temperature measurement circuit module is connected with the LED over-temperature state indication circuit module, and the LED over-temperature state indication circuit module is connected with the output end of the thermistor temperature measurement circuit module and comprises a plurality of LED indication diodes installed on the surface of an upper cover of the photovoltaic junction box. According to the photovoltaic junction box, when a thermistor detects that currents flowing through the diodes are exceedingly high, the LED indication diodes on the surface of the junction box are controlled to be in an over-temperature abnormal state, and temperature monitoring and warning of the photovoltaic wiring box are achieved.

Description

technical field [0001] The present invention relates to the field of photovoltaic power generation, in particular to a photovoltaic junction box used in a photovoltaic power generation system, in particular to an over-temperature state indication photovoltaic junction box based on temperature measurement by a thermistor. Background technique [0002] In the electrical connection technology of a photovoltaic power generation system, a photovoltaic junction box is usually used to realize the electrical connection between a photovoltaic module, that is, a solar cell group, and an inverter. The current photovoltaic junction box is provided with an installation cavity between the box bodies, and the conductive sheet with the diode is installed in the installation cavity. The number of diodes is the same as the number of solar cells, and they are connected in parallel with the solar cells one by one. The function of the diode is to use its principle of forward conduction and reve...

AI Technical Summary

Problems solved by technology

The function of the diode is to use its principle of forward conduction and reverse cut-off to prevent reverse charging from damaging the solar cell group, and to prevent a solar cell from being disconnected from causing the entire solar cell group to be unusable.

Since the diode conducts a current of about 10A when it is working, it will cause a large amount of heat accumulation and generate a higher temperature. As the temperature of the diode continues to rise, the resistance in the diode will continue to increase, resulting in more heat generated by the diode. Heat, thus wasting more power resources into a vicious circle

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