| 摘要 |
A thermostat uses a source of a signal representing anticipation heat which is transmitted to a circuit to be combined with a signal from a temperature sensing element with a first time constant or delay when the thermostat is "ON", i.e., controlling a heat source to supply heat to a heat receiver and with a different time constant or delay when the thermostat is "OFF", i.e., controlling the heat source to interrupt the supply of heat to the heat receiver. This variable time constant provides a greater proportion of the anticipation or feedback of the anticipation signal to be combined with the signal from the temperature sensing element circuit at light loads of the temperature or heat producing element in the heat source to improve the stability of the heat control system since stability is generally increased with increased feedback without increasing the total anticipation heat representing signal whereby to minimize the system control point offset or droop which is the control band in which the control action of the thermostat takes place between the start of the "on" operation and the full "on" operation.
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