Single phase motor driving circuit and single phase motor...

Details Single phase motor driving circuit and single phase motor... Single phase motor driving circuit and single phase motor...

2005-09-13

2005-09-13

Masih, Karen (Department: 2837)

Electricity: motive power systems

Automatic and/or with time-delay means

Responsive to thermal conditions

C318S291000

Reexamination Certificate

active

06943517

ABSTRACT:
A single-phase motor driving circuit includes a controller for outputting a control signal to drive a single-phase motor in a period in which a saw-tooth voltage of a predetermined cycle is larger than a duty setting voltage based on a result of comparing a detected temperature voltage changed based on a temperature detected by a temperature detecting device with a starting duty setting voltage increased with time while a voltage smaller than the detected temperature voltage at the time of starting the single-phase motor is set as an initial value. The controller sets the duty setting voltage as the starting duty setting voltage when the result of the comparison shows that the starting duty setting voltage is smaller than the detected temperature voltage, and the duty setting voltage as the detected temperature voltage when the starting duty setting voltage is larger than the detected temperature voltage.

REFERENCES:
patent: 6476579 (2002-11-01), Akahane et al.
patent: 2002/0167565 (2002-11-01), Maeda et al.
patent: HEI3-74199 (1991-07-01), None

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