This reference design uses a single NuMicro^® M483SGCAE microcontroller to implement single-phase bi-directional inverter and PV energy storage control based on three active full-bridge and SEPIC buck-boost topology principle. It supports three operating modes:This reference design uses a single NuMicro® M483SGCAE microcontroller to implement single-phase bi-directional inverter and PV energy storage control based on three active full-bridge and SEPIC buck-boost topology principle. It supports three operating modes:

1.AC charging mode, where the grid acts as the source to control PFC + LLC for batterycharging; 
2. Discharging mode, where the battery acts as the source to control QLC and the inverter bridge to output power for AC loads; 
3. DC buck-boost charging mode, where PV input starts MPPT mode for battery charging.

It provides high power efficiency with low THD, and easy-to-understand software are more attractive to power supply development engineers. Delivering a complete hardware and software reference design (including auxiliary power supply), which can shorten the R&D cycle and accelerate product launch.


Feature
•Charge AC 220V / 110V input up to 1 kW, 50 Hz / 60 Hz
•Inverter AC 220V /110V output up to 2 kW, 50 Hz / 60 Hz
•Peak efficiency of 95% for the whole machine bidirectional operation
•DC charge support 12V to 50V, maximum 400 W
•Supports automatic identification of PV / MPPT source charging
•Protection Functions: OVP, UVP, CBC, short circuit, overtemperature, overload, etc.

Specifications
M483 (32-bit Arm® Cortex®-M4F)
•ARM Cortex-M4F Core with FPU (Float Process Unit)
•Operating Frequency: 192 MHz
•Operating Voltage: 1.8V to 3.6V
•Supports 4 KB + 256 KB Flash Memory ; 128 KB SRAM
•Rich Peripheral
 -16-bit BPWM: 12 channels
 -16-bit EPWM: 12 channels
 -12-bit EADC: 16 channels
 -12-bit DAC: 1 channel
 -ACMP: 2 comparators
•Communication Interfaces
 -LPUART: 8 channels
 -SPI / I²S: 3 channels
 -CAN: 3 channels
 -USB FS OTG: 1 port
 -GPIO: 52pins
•Operating Temperature: -40℃ to 105℃

System Block Diagram