Electricity: motive power systems – Automatic and/or with time-delay means
Patent
1998-06-26
2000-04-25
Ip, Paul
Electricity: motive power systems
Automatic and/or with time-delay means
318685, 318473, 318254, H02P 800
Patent
active
06054824&
ABSTRACT:
A drive circuit with signal detection capability for a DC brushless fan motor is disclosed. The drive circuit comprises a Hall effect sensor for detecting the magnetic polarity of the rotor in the fan motor, first and second transistors connected to first and second magnetic coils respectively for alternately generating magnetic fields to continuously rotate the rotor of the fan motor and further comprises a series RC circuit and a field effect transistor for detecting the operation of the fan motor. A signal detection line connected to the source of the field effect transistor is provided for detecting the operation of the fan motor. When the fan motor is running normally, the signal detection line presents a square wave signal with frequency proportional to the rotating speed of the fan motor. When the motor stops running, the signal detection line always presents a high level signal. The field effect transistor is powered up by an external power source whereby the magnitude of the detected signal on the detection line is adjustable.
REFERENCES:
patent: 4506218 (1985-03-01), Brown et al.
patent: 4535274 (1985-08-01), Suzuki et al.
patent: 4644238 (1987-02-01), Hirosaki
patent: 4992717 (1991-02-01), Marwin et al.
patent: 5152477 (1992-10-01), Yeh
patent: 5309076 (1994-05-01), Madsen et al.
patent: 5448143 (1995-09-01), Pecone
patent: 5554913 (1996-09-01), Ohsawa
patent: 5604654 (1997-02-01), Wille et al.
patent: 5726911 (1998-03-01), Canada et al.
patent: 5727928 (1998-03-01), Brown
patent: 5889469 (1999-03-01), Mykytiuk et al.
patent: 5898288 (1999-04-01), Rice et al.
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