Ventilator and gas supply control method thereof

A ventilator, comprising:

• a first gas path, comprising a first pressurized gas source adaptor and a first flow adjustment device connected in sequence;
• a second gas path, comprising a second pressurized gas source adaptor and a second flow adjustment device connected in sequence;
• a third gas path, comprising a third pressurized gas source adaptor;
• a first inhalation branch configured for delivering inhalation gas to a patient;
• a second inhalation branch configured for delivering inhalation gas to the patient, the second inhalation branch comprising a gas compression device;
• a switching device, configured to operate in a first mixing mode where the first gas path and the second gas path are connected to the first inhalation branch, and in a second mixing mode where the first gas path and the third gas path are connected to the second inhalation branch;
• and
• an exhalation branch configured for managing exhaled gas of the patient.