SD card protection circuit used for medical instruments

The invention relates to an SD card protection circuit for medical instruments, in particular to a protection circuit applied to the condition of the power down of SD cards. With the protection circuit adopted, the SD cards can keep data integrity under any power down condition. The protection circuit is provided with an input power source, a battery, a microprocessor and an SD card; the input power source serves as a power source under a normal working mode; the battery serves as a power source in a power-down process; the microprocessor is connected with the input power source and the battery; the SD card is connected with the SD communication port of the microprocessor; the input power source is connected with the battery through a charging module; under a normal working mode, the inputpower source supplies power to the microprocessor, and meanwhile, the battery is charged through the charging module; and under a power-down mode, the battery supplies power to the microprocessor. 本发明涉及一种用于医疗器械的SD卡保护电路，尤其是一种