Motor step-less speed control with active feedback of phase detector
AssigneeHoneywell International Inc.
InventorsDouglas D. Bird, Brent Chian
Life of this patent
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Abstract
An apparatus for and method of controlling the circulating fan of a gas appliance. The circulating fan is powered by an alternating current electric motor. An electronic circuit, powered by the heat of the gas appliance, determines the rotational speed of the electric motor by controlling the effective duty cycle of the alternating current source coupled to the electric motor.
Claims18
In an appliance having a flame and having a circulating fan, the improvement comprising:
- a. an electronic control circuit, powered by said flame, which controls the speed of said circulating fan.
An apparatus comprising:
- a. a gas appliance having a flame;
- b. a circulating fan;
- and
- c. an electronic circuit, powered by said flame, which controls the speed of said circulating fan.
A method of controlling the rotational speed of a circulating fan within a gas appliance having a flame comprising:
- a. powering an electronic circuit by said flame;
- and
- b. controlling said rotational speed of said circulating fan with said electronic circuit.
An apparatus comprising:
- a. means for producing a flame;
- b. means for circulating air;
- c. means responsively coupled to said producing means and said circulating means and powered by said flame for controlling said circulating means;
- d. wherein said controlling means further comprises an electronic circuit;
- and
- e. wherein said controlling means further comprises a microprocessor.
Dependencies are inferred from the claim text.