Starter motor protection circuit with relay protection

Details Starter motor protection circuit with relay protection Starter motor protection circuit with relay protection

1993-07-07

1994-08-30

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 18, 361 90, H02H 307

Patent

active

053433513

ABSTRACT:
A starter motor energized through a relay is protected from low voltages by a circuit which senses low voltages and turns off the motor relay via a transistor switch. A generator voltage sensing circuit also turns off the relay via the same switch when a generator voltage threshold is reached. For operation over a wide system voltage range, the coil of the relay is protected against high voltages by a chopper circuit which operates the transistor switch at a duty cycle of 100% at low voltages across the coil and lower duty cycles at high voltages. For a 12 volt relay the average current at higher voltages is maintained at a value approximating that obtained at a steady state 12 volts.

REFERENCES:
patent: 4490620 (1984-12-01), Hansen
patent: 4585986 (1986-04-01), Dyer

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