The components of the photovoltaic controller mainly include a single-chip circuit, a circuit for controlling the power supply, a circuit for real-time control of the clock, a circuit for driving the display by the liquid crystal, and a circuit for charging the switch and driving the keyboard interface. Specifically, in the single-chip circuit, the connection between the input and output ports and other circuits with different functions is realized. The implementation of sampling and measuring work on the battery and the photovoltaic circuit mainly depends on the A/D input port; the power supply for the single chip microcomputer and other circuits is The switching power supply circuit; and the main function of the circuit for driving the display by the liquid crystal is to realize the connection with the single-chip circuit by using the nibble data and the control vertical line as a bridge. It should be noted that the controller of the liquid crystal display circuit is independent of itself, and the supply of its working power is the responsibility of the power module. By serially connecting the SCL and SDA bus and the single-chip microcomputer, the read/write function is played out, which is completed by the real-time clock circuit; the circuit for charging the switch adopts the FET method, and realizes the single-chip microcomputer through a set of control lines. The circuits are connected and the charging control signal is output.
The substation photovoltaic DC system relies on the role of the solar module square array to convert solar energy into effective electric energy, and stabilizes the output under the action of the photovoltaic controller, and realizes docking with the DC system. If the voltage output by the solar module meets the voltage requirements of the DC system, the AC contactor at the input of the charger is automatically disconnected under the control of the photovoltaic controller, and the work of supplying power to the DC system of the substation is completed by the photovoltaic power source. Correspondingly, if the output voltage does not meet the voltage requirements of the DC system, the output operation will automatically stop under the control of the photovoltaic controller, and at the same time, the AC contactor at the input end of the charger will also close. At this time, the DC system power supply work of the substation is completed by the charger. The photovoltaic controller and the charger operate alternately under such a working principle to achieve automatic switching.
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