Electricity: motive power systems – Automatic and/or with time-delay means
Reexamination Certificate
2000-05-02
2001-09-18
Ip, Paul (Department: 2837)
Electricity: motive power systems
Automatic and/or with time-delay means
C318S471000, C318S473000
Reexamination Certificate
active
06291956
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a temperature controlled radiating fan, and especially to radiating fan wherein the rotary speed of the fan motor is varied according to a voltage variation, so that the characteristic of the rotary speed of the fan motor is linearly changed.
BACKGROUND OF THE INVENTION
In the prior art temperature controlled radiating fan, a pulse width modulation (PWM) serves to change the modulation way of the rotary speed of the fan motor, such as those disclosed in Taiwan Patent No. 0327486, “DC brushless fan PWM control circuit”, No. 0152583, “PWM DC brushless radiating fan”, and No. 0146147, “AC motor stageless speed change PWM control”.
However, the prior art designs have the disadvantages of larger volume, many components, high manufacturing cost, worse linearity. Thus, there is an eager demand for a temperature controlled radiating fan having a control circuit which is varied linearly according to a voltage variation.
SUMMARY OF THE INVENTION
Accordingly, the primary object of the present invention is to provide a temperature controlled radiating fan. The temperature controlled radiating fan comprises a temperature detector, a control circuit, a power control circuit, a regulator, a loading circuit and a driving circuit. Thereby, the rotary speed of the fan motor is varied according to a voltage variation, so that the characteristic of the rotary speed of the fan motor is linearly changed.
Another object of the present invention is to provide a temperature controlled radiating fan which has the advantages of a small volume, a low cost and a preferred characteristic.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.
REFERENCES:
patent: 4124001 (1978-11-01), Samuel et al.
patent: 5718373 (1998-02-01), Kim et al.
patent: 5831405 (1998-11-01), Massie
patent: 5925948 (1999-07-01), Matsumoto
patent: 5929581 (1999-07-01), Van Brocklin et al.
patent: 5957582 (1999-09-01), Gillen et al.
patent: 5983653 (1999-11-01), Lee
patent: 5999768 (1999-12-01), Gillen et al.
patent: 6011371 (2000-01-01), Van Brocklin et al.
patent: 6024487 (2000-02-01), Gillen et al.
Ip Paul
Rosenberg , Klein & Lee
Taiwan Da-Long Industrial Co., Ltd.
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