| 摘要 |
A circuit for controlling a heater element coupled to a traffic signal light includes: a thermistor positioned at an exterior of a lens of the traffic signal light, a resistance of the thermistor decreasing as a temperature of the lens increases; and a comparator positioned at an interior of the lens, the comparator being configured to monitor a feedback signal from the thermistor and to compare the feedback signal to a reference signal, and to turn power supplied to the heater element on and off based on the comparison.
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