Over-temperature status indicating type photovoltaic junction box based on far infrared heat sensors

Abstract

The invention discloses an over-temperature status indicating type photovoltaic junction box based on far infrared heat sensors. The over-temperature status indicating type photovoltaic junction box based on the far infrared heat sensors comprises a diode string, photovoltaic cable interfaces, far infrared heat sensor modules and an LED over-temperature status indicating circuit module. The diode string comprises a plurality of diodes connected in series in the same direction, the number of the diodes is the same with that of photovoltaic cells, and the diodes are correspondingly connected with the photovoltaic cells in parallel. The two photovoltaic cable interfaces are connected with the two ends of the diode string respectively. The far infrared heat sensor modules are connected to lines of all the diodes in the diode string respectively, and the output ends of the far infrared heat sensor modules are connected with the LED over-temperature status indicating circuit module. The LED over-temperature status indicating circuit module is connected with the output ends of the far infrared heat sensor modules and comprises a plurality of LED indicating diodes arranged on the surface of an upper cover of the junction box. According to the over-temperature status indicating type photovoltaic junction box based on the far infrared heat sensors, when the far infrared heat sensors detect the excessive heat radiation of the diodes, LED indicating diodes are controlled to present over-temperature abnormal statuses, and monitoring and alarming of the temperature of the junction box are achieved.

Description

technical field [0001] The 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 a photovoltaic junction box based on a far-infrared thermal sensor for over-temperature status indication. 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 reverse cut-off to...

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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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