Circuit arrangement for contactless switchover of operation para

Details Circuit arrangement for contactless switchover of operation para Circuit arrangement for contactless switchover of operation para

1992-11-16

1995-03-21

Stephan, Steven L.

Electricity: power supply or regulation systems

Input level responsive

Phase controlled switching using electronic tube or a three...

323282, G05F 500, G05F 140

Patent

active

053999592

ABSTRACT:
A circuit arrangement is disclosed for a non-contacting switch-over of operational parameters in an electrically driven tool, for instance, a hammer drill, which are determined by a voltage divider ratio with reference to a stabilized supply source. The voltage divider ratio is obtained by selective parallel switching of an additional ohmic resistor by means of a Hall switch, whose current supply is supplied by a Zener diode which lies in series with the stabilized supply source. The circuit of the Hall switch puts the low point of the additional resistor, connected through a diode, to the low point of the voltage divider, in parallel with the partial resistor of the voltage divider, through a drop resistance. The switching arrangement or circuit arrangement has the advantage that the current supply of an RPM control unit is only slightly additionally loaded or increased.

REFERENCES:
patent: 4001663 (1977-01-01), Bray
patent: 4811184 (1989-03-01), Koninsky et al.
patent: 4847546 (1989-07-01), Bobier et al.
patent: 4862013 (1989-08-01), Konopka

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