초록 ▼

A humidity control device includes a microcontroller, a variable impedance humidity sensing circuit and a zero crossing detector circuit. The humidity sensing circuit and zero crossing circuit are provided with an AC line voltage and both have outputs which are provided to the microcontroller. The h

A humidity control device includes a microcontroller, a variable impedance humidity sensing circuit and a zero crossing detector circuit. The humidity sensing circuit and zero crossing circuit are provided with an AC line voltage and both have outputs which are provided to the microcontroller. The humidity control device also includes a semiconductor switch circuit which switches the AC line voltage to an external electrical device, such as a dehumidifier or heater, at the zero crossing.

대표청구항 ▼

A humidity control device for sensing humidity and for selectively energizing an electrical device connected to an AC line voltage in response to the sensed humidity, which comprises: a humidity sensing circuit, the humidity sensing circuit including circuit components, at least one of the circuit c

A humidity control device for sensing humidity and for selectively energizing an electrical device connected to an AC line voltage in response to the sensed humidity, which comprises: a humidity sensing circuit, the humidity sensing circuit including circuit components, at least one of the circuit components being a humidity sensor which is coupled and responsive to the AC line voltage, the circuit components forming a balanced circuit such that the humidity sensing circuit is substantially self-compensating for AC line voltage variations, the humidity sensing circuit sensing the humidity and comparing the sensed humidity with a preselected humidity set point and generating a first output signal in response to the comparison thereof, a zero crossing detector, the zero crossing detector detecting a zero crossing of the AC line voltage, the zero crossing detector being responsive to the AC line voltage and generating a second output signal indicating the zero crossing thereof, a microcontroller, the microcontroller being responsive to the first and second output signals of the humidity sensing circuit and zero crossing detector and generating a third output signal in response thereto; and means for switching the AC line voltage connected to the electrical device, the AC line voltage switching means being responsive to the third output signal of the microcontroller and selectively providing the AC line voltage to the electrical device in response thereto thereby selectively energizing and deenergizing the electrical device in a manner which substantially reduces radio frequency interference.