Wire heated tube with temperature control system, tube type detection, and active over temperature protection for humidifier for respiratory apparatus

A control system for a heated conduit for use in a respiratory apparatus, the control system comprising:

• a power supply to provide power to the heated conduit;
• an over-temperature control circuit to prevent the overheating of the heated conduit;
• a heating control circuit configured to control heating to obtain a predetermined temperature;
• a sensing circuit including a sensing resistor configured to indicate the temperature of a sensor positioned in the heated conduit;
• and
• a bias generator circuit configured to provide a first source voltage to the sensing circuit so that the temperature of the heated conduit is continuously monitored.