Service battery charging management device and method for power supply of recreational vehicle

A service battery charging management device for power supply of a recreational vehicle, comprising:

• a vehicle generator, a solar cell panel, a MCU main control unit, an input automatic switching unit, a charging main converting DC/DC circuit, a charging current detection unit, a service battery, a voltage detection unit, a temperature detection unit, a PWM mode charging unit, a load current detection unit, a load, and a bypass unit;
• wherein the vehicle generator is connected with the MCU main control unit and is configured to transmit an output voltage VALT thereof to the MCU main control unit;
• meanwhile, an output terminal of the vehicle generator is connected with the load through the bypass unit for charging the load, and also is connected to the service battery through the input automatic switching unit, the charging main converting DC/DC circuit and the charging current detection unit for charging the service battery;
• the solar cell panel is connected with the MCU main control unit and is configured to transmit an output voltage VPV thereof to the MCU main control unit;
• an output terminal of the solar cell panel is connected with a starting battery through the PWM mode charging unit for charging the starting battery, and also is connected with the service battery through the input automatic switching unit, the charging main converting DC/DC circuit and the charging current detection unit for charging the service battery;
• the service battery is connected with the load through the load current detection unit and is configured to provide working power supply to the load;
• both the charging current detection unit and the load current detection unit are configured to be connected to the MCU main control unit for respectively transmitting charging current and load current of the service battery to the MCU main control unit;
• the service battery is connected with the MCU main control unit through the voltage detection unit, wherein the voltage detection unit is configured to detect a voltage of the service battery and transmits the voltage value to the MCU main control unit;
• the service battery is also connected with the MCU main control unit through the temperature detection unit, wherein the temperature detection unit is configured to detect an operating temperature of the service battery and transmit the temperature value to the MCU main control unit;
• the MCU main control unit is connected with the input automatic switching unit and the charging main converting DC/DC circuit, wherein the charging main converting DC/DC circuit is provided with a MPPT charging mode and a switching power supply charging mode;
• and the MCU main control unit is configured to control the input automatic switching unit and the charging main converting DC/DC circuit according to the output voltage VPV of the solar cell panel and the output voltage VALT of the vehicle generator, and is further configured to adjust the charging main converting DC/DC circuit according to the operating temperature and the voltage of the service battery;
• and
• the MCU main control unit is connected with the bypass unit and is configured for on-off control of the bypass unit according to the charging current of the service battery and the load current;
• the MCU main control unit is further connected with the PWM mode charging unit and is configured for on-off control of the PWM mode charging unit according to a state of the service battery.