| 摘要 |
The inventive design represents a differential controller for monitoring two temperatures, the first temperature monitoring the inner portion of a power switch and the second monitoring the room temperature where the switch is located. The differential controller actuates by turning on/off a heater resistance arrangement located in the inner portion of the switch; the resistances are intended to maintain a minimum of 1-5, 1-10 and 1-15 °C above the room temperature. The design has a couple of displays of 7 segments for visualizing the two temperatures that are being monitored. Led's are used as a visual help for showing each sensor, actuating voltage for heater resistances and checking the inner state of said resistances.
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