Temperature control method and system for heated breathing-circuit, and breathing assistance apparatus thereof

A temperature control method for a heated breathing-circuit of a breathing assistance apparatus, the method comprising:

• continuously controlling the heated breathing-circuit to be heated continuously in a first predetermined time period though the function-selection circuit, utilizing time-division multiplexing;
• obtaining a sampling temperature signal of the heated breathing-circuit in a second predetermined time period thought the function-selection circuit, wherein the heated breathing-circuit is electrically connected with the temperature-sampling circuit thought the function-selection circuit during the second predetermined time period;
• obtaining a resistance value of a temperature sensing loop by converting the sampling temperature signal;
• controlling the temperature-sampling circuit to be electrically connected with the short-circuit loop in a third predetermined time period thought the function-selection circuit, to obtain an internal resistance value of the temperature-sampling circuit, the first predetermined time period, the second predetermined time period, and the third predetermined time period form a processing cycle time period;
• obtaining a resistance value of the temperature sensor thought the resistance value of the temperature sensing loop, a resistance value of the resistance wire, and the internal resistance of the temperature-sampling circuit;
• and
• calculating the resistance value of the temperature sensor and the temperature of the temperature sensor, to obtain an actual temperature value of the heated breathing-circuit, thought a predetermined conversion formula.

A temperature control method for a heated breathing-circuit of a breathing assistance apparatus, comprising:

• controlling the heated breathing-circuit to be heated continuously in a first predetermined time period though a function-selection circuit, the heated breathing-circuit provided with a temperature sensor;
• obtaining a sampling temperature signal of the heated breathing-circuit in a second predetermined time period thought the function-selection circuit, wherein the heated breathing-circuit is electrically connected with a temperature-sampling circuit thought the function-selection circuit during the second predetermined time period;
• obtaining a resistance value of a temperature sensing loop by converting the sampling temperature signal;
• controlling the temperature-sampling circuit to be electrically connected with a short-circuit loop in a third predetermined time period thought the function-selection circuit, to obtain an internal resistance value of the temperature-sampling circuit;
• the first predetermined time period, the second predetermined time period, and the third predetermined time period form a processing cycle time period;
• obtaining a resistance value of the temperature sensor thought the resistance value of the temperature sensing loop, a resistance value of the resistance wire, and the internal resistance of the temperature-sampling circuit;
• and
• calculating the resistance value of the temperature sensor and the temperature of the temperature sensor to obtain an actual temperature value of the heated breathing-circuit, thought a predetermined conversion formula.