Design and implementation of satellite bus power acquisition system based on FPGA

To achieve the function of bus power monitoring in the satellite ground test stage, a satellite bus power acquisition system based on FPGA was developed. The system consists of the following four parts: The FPGA main control circuit is responsible for driving the analog-to-digital converter and performing digital acquisition of voltage and current as well as power calculation; the bus current acquisition circuit realizes current acquisition through the high-side current differential detection method; the bus voltage acquisition circuit realizes voltage acquisition through the isolation amplification detection method; the bus power supply control circuit controls the on-off of the power supply circuit through a high-power magnetic latching relay. The satellite bus power acquisition system supports single-channel power acquisition, with a power measurement range of 0 to 1200W. Experiments have proved that the bus power measurement accuracy is better than 0.2% of the range + 0.2% of the reading, and it can realize the power measurement of the satellite bus.