Huby, Ronald James,Adrian Ashley Vos,Tang, Zhuo Ran
申请号：
NZ74303414
公开号：
NZ743034A
申请日:
2014.01.30
申请国别(地区):
NZ
年份:
2019
代理人:
摘要：
A control system for a heated conduit for use in a respiratory apparatus is disclosed. The control system comprises a power supply to provide power to the heated conduit； a heating control circuit configured to control heating of the heated conduit to obtain a predetermined temperature； a sensing circuit configured to provide an output to the heating control circuit to indicate the temperature of a sensor positioned in the heated conduit and a bias generator circuit. The bias generator circuit comprises a passive resistor bridge that receives power from the power supply and provides a reference voltage to the sensing circuit to allow determination of the temperature of the heated conduit as a function of a voltage drop across an element of the sensing circuit during both heating ON and heating OFF cycles. The polarity of the sensing circuit output varies as a function of an output of the heating control circuit.
