Breathing machine based on variable power, control method and device

The invention provides a power-variable respirator charging control method which comprises the steps that the total power of current operation of a respirator is calculated according to a preset period, and the total power of current operation is the total power of all function modules in the respirator; calculating available charging power according to the power supply power and the total power of current operation; and matching the optimal charging power according to the available charging power and the rated power of the rechargeable battery so as to charge the battery. The invention further provides a charging control device for the breathing machine with the variable power. The invention further provides the breathing machine. According to the charging control method for the breathing machine with the variable power provided by the technical scheme of the invention, the optimal charging power can be automatically matched according to the total power of the current operation of the breathing machine. 本发明提