Abstract:

Photovoltaic junction box plays an important role in photovoltaic power,which is mainly used for the connection between solar photovoltaic component and the DC control cabinet.The main circuit of photovoltaic junction box designed in this paper uses the single chip microcomputer STC12C5A60S2 as the control core,consisting of the current detection circuit,temperature detection circuit,communication circuit and power supply circuit,so as to achieve the photovoltaic junction box temperature detection.The Holzer sensor is used to make the current patrol of the solar photovoltaic module array;DC-DC principle is used to achieve the conversion of high voltage to the low voltage,and provides power for the main control circuit;in addition,the communication of photovoltaic junction box with the PC is achieved.The design is simple and practical with the advantages of low cost and high reliability.

Key words: photovoltaic junction box;single chip microcomputer STC12C5A60S2;Holzer sensor