Temperature protective circuit for a charging generator

Details Temperature protective circuit for a charging generator Temperature protective circuit for a charging generator

1984-06-08

1986-06-10

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Generator protective circuits

322 33, H02H 706

Patent

active

045946310

ABSTRACT:
A charging generator system including a protective circuit which prevents the generator system from overheating when the ambient temperature is extraordinarily high. A protective shorting circuit is coupled between a rectifier output terminal supplying the field coil of the generator and the ground terminal. The protective shorting circuit has a high resistance for normal temperatures and a low resistance for high temperatures, thereby to interrupt the current flow in the field coil when high temperatures occur. In one embodiment, the protective shorting circuit means is implemented with a single thermistor. In another embodiment, a protective transistor is coupled to the field coil, and base current is supplied to the protective transistor when the temperature rises above a predetermined level to thereby shut off the current flow through the field coil under such conditions.

REFERENCES:
patent: 3643153 (1972-02-01), Hanson et al.
patent: 3697807 (1972-10-01), Christ
patent: 3938005 (1976-02-01), Cummins

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