Network type MPPT solar charge controller, including DSP main control module, multi-channel half-bridge driver module, multi-phase synchronous rectification module, voltage/current sampling module, internal 485 communication module, input/output module, and power supply for each of the above modules System power supply module.
Among them, one end of the network-type MPPT solar charge controller multi-channel half-bridge driver module is connected to the output end of the DSP main control module, and the other end is connected to the multi-phase synchronous rectification module(80a mppt charge controller). The output end of the multi-phase synchronous rectification module is connected to a voltage/current sampling The modules are connected, and the output end of the voltage/current sampling module is connected to the input end of the DSP main control module, and the DSP main control module is connected to the input/output module through an internal 485 communication module.
The user inputs relevant instructions through the key input circuit according to their needs, and transmits them to the DSP main control module through the ARM slave control circuit and internal 485 communication module;
The DSP main control module generates multi-channel out-of-phase PWM waveforms and outputs them to the multi-channel half-bridge driver module(intelligent pwm solar charge controller). The driver chip of the multi-channel half-bridge driver module drives the multi-channel half-bridge MOSFETs of the multi-phase synchronous rectifier module to achieve a staggered-phase parallel connection. Then through the inductance confluence, realize the time-sharing transmission of energy to achieve greater output power;
The DSP main control module collects the battery voltage and the charging current of each multi-phase synchronous rectification module in real-time through the voltage/current sampling module at the same time and realizes the maximum MPPT tracking: the maximum power tracking algorithm of the DSP main control module uses the variable step perturbation method. When the output point is far from the maximum power point, use a large step size, when the output point is close to the maximum power point, use a small step size. When the collected output current changes from large to small, it is considered that the maximum output PowerPoint has been tracked;
The DSP main control module sends relevant instructions to the ARM slave control circuit through the internal 485 communication module, and finally displays and communicates through the liquid crystal display module and/or wireless communication module to realize the parameter setting and data reading of the DSP main control module. And the networking function of wireless communication.
The network-type MPPT solar charge controller and its control method adopt the DC-DC charging method. By connecting multiple synchronous buck circuits in phase-staggered parallel connection, efficient charging management of the battery is realized. Compared with single-phase buck circuits, a phase-staggered parallel connection can be achieved. Achieve greater power output, while effectively reducing the size of the inductor, and the efficiency of the multi-phase synchronous rectification module is as high as 98%; at the same time, parameter setting, data reading, and wireless network monitoring are realized through the input/output module, without complicated Field wiring.