Bluetooth adapter and Bluetooth adaptation system

The Bluetooth adapter comprises a control chip, a power supply circuit and a charging and discharging circuit, and the control chip is connected with electronic equipment through an interface; the power supply circuit receives power supply voltage from the electronic equipment through the interface and is used for converting the power supply voltage into charging voltage so as to provide the charging voltage to the control chip; the charging and discharging circuit is connected with the control chip, and the control chip is used for controlling the charging and discharging circuit to supply power to the control chip when it is detected that the charging voltage is smaller than the preset voltage. Wherein the control chip detects that the charging voltage is smaller than the preset voltage, namely, the control chip judges that the Bluetooth adapter is disconnected with the electronic equipment, and the control chip controls the charging and discharging circuit to supply power to the control chip, so that the B