CPC H05K 1/0212 (2013.01) [H05K 1/0213 (2013.01); H05K 2201/10151 (2013.01)] | 7 Claims |
1. An apparatus comprising:
a relatively higher-voltage circuit adapted to provide output voltage to a load;
a relatively lower-voltage circuit adjacent the relatively higher-voltage circuit, wherein the relatively lower-voltage circuit outputs a heater control signal; and
a heater connected to receive the heater control signal from the relatively lower-voltage circuit,
wherein the relatively higher-voltage circuit and the relatively lower-voltage circuit are positioned, relative to each other, to experience same environmental conditions,
wherein the relatively higher-voltage circuit includes a transformer providing the output voltage,
wherein the relatively lower-voltage circuit comprises a humidity sensor and an amplifier connected to the humidity sensor,
wherein the amplifier is connected to receive:
a first input from the humidity sensor; and
a second input comprising a portion of the output voltage from the transformer that is a proportional voltage that is lower than, and proportional to, the output voltage,
wherein the relatively lower-voltage circuit further comprises a signal converter connected to the amplifier and the heater, and
wherein the signal converter supplies the heater control signal to the heater based on output from the amplifier.
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