Dual trigger Hall effect I.C. switch

Details Dual trigger Hall effect I.C. switch Dual trigger Hall effect I.C. switch

1987-02-24

1988-08-02

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307290, 324251, H03K 1790, H03K 329

Patent

active

047615699

ABSTRACT:
An integrated circuit switch including a Hall element, a Hall-voltage amplifier having an output to which the inputs of two Schmitt trigger circuits are connected may be mounted between stator windings in a brushless D.C. motor as a rotor position detector and motor commutator circuit. The outputs of the respective Schmitt trigger circuit may be connected to excite a pair of the stator windings. The two binary exciting signals are mutually complimentary except for having non-simultaneous changes from one binary state to the other. Integrated circuits of this invention eliminate acoustic noise that is caused by such overlapping stator currents that were unwittingly present in commutation circuits of the prior art.

REFERENCES:
patent: 3164727 (1965-01-01), Heyda
patent: 3324398 (1967-06-01), Moore
patent: 4200814 (1980-05-01), Tanaka et al.
patent: 4218626 (1980-08-01), Fukada et al.
patent: 4283643 (1981-08-01), Levin
patent: 4296410 (1981-10-01), Higgs et al.
patent: 4443716 (1984-04-01), Avery

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