The control circuit of a photovoltaic junction box usually includes the following main components:
1. microprocessor or controller: responsible for the intelligent control of the entire junction box, performing data acquisition, processing, control, and communication functions.
2. Voltage and current detection circuit: used to detect the output voltage and current of photovoltaic modules, providing real-time data for the control system.
3. Protection circuit: including overvoltage protection, undervoltage protection, overcurrent protection, and reverse protection, to ensure the safe and stable operation of the photovoltaic system under abnormal conditions.
4. Maximum Power Point Tracking (MPPT) control circuit: By adjusting the operating voltage of photovoltaic modules in real time, it can track the maximum power point and improve the energy conversion efficiency of the photovoltaic system.
5. Communication interface: such as RS-485, Wi Fi, or GPRS, used to achieve data transmission and remote control between the junction box and external monitoring equipment and control systems.
6. Relays or circuit breakers: used to connect and disconnect photovoltaic modules from the power grid or energy storage equipment.
7. Human computer interaction interface: such as LCD display screen and buttons, providing status display and basic parameter setting functions for junction boxes.
8. Power supply circuit: provides stable power supply for the control circuit, including DC power supply and AC power supply.
