Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1992-01-09
1992-08-04
Stephan, Steven L.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
361104, 337187, 337198, 318 16, 318139, 446456, H02H 709
Patent
active
051364522
ABSTRACT:
An RC controller includes a circuitboard with a circuit for variably coupling power from a battery to the drive motor of a radio controlled model. The circuit includes braking componentry that produces a low resistance path in parallel with the motor in order to brake the motor under operator control. The braking componentry includes a flyback diode and a semiconductor device connected across the terminals of the drive motor. The flyback diode may be a separate component or a part of the semiconductor device. According to a major aspect of the invention, a fuse is provided in series with the flyback diode to protect it against damage in the event the battery is connected backwards. The fuse is placed to protect the flyback diode without introducing an undesired voltage drop between the battery and the drive motor. Various fuse placements are disclosed. Instead of a separate fuse, one embodiment includes an unfused flyback diode that doubles as a fuse. To facilitate replacement, it may be pluggable or even soldered to terminals on the exterior of the controller housing in a user-accessible position. Another embodiment is arranged to operate in conjunction with a user-provided connection between one terminal of the battery and one terminal of the drive motor.
REFERENCES:
patent: 4164726 (1979-08-01), Weibe
patent: 4305030 (1981-12-01), Lorenz
patent: 4406982 (1983-09-01), McClellan, Jr.
patent: 4450397 (1984-05-01), Painter et al.
patent: 5043640 (1991-08-01), Orton
Berhane Adolf
Hanson Loyal M.
Stephan Steven L.
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