Head lamp control method and apparatus, with PWM output regulati

Details Head lamp control method and apparatus, with PWM output regulati Head lamp control method and apparatus, with PWM output regulati

1987-10-19

1989-06-20

Coles, Sr., Edward L.

Electric lamp and discharge devices: systems

Special application

Vehicle

315307, 307 108, 323300, B60Q 102

Patent

active

048411981

ABSTRACT:
A pulse width modulation control unit for energizing a vehicle head lamp. During daylight operation of a motor vehicle the control unit energizes the head lamp by pulse width modulating the battery output and coupling the modulating output across the head lamp. As battery voltage changes the pulse width modulation is adjusted to maintain power output of the head lamp. An over current condition in a switching transistor is monitored and used to de-activate the pulse width modulation of the head lamp energization.

REFERENCES:
patent: 3891888 (1975-06-01), Soutgate
patent: 4230970 (1980-10-01), Potter et al.
patent: 4237405 (1980-12-01), Kellis
patent: 4326161 (1982-04-01), Kreinberg
patent: 4388558 (1983-06-01), Mizuno et al.
patent: 4499525 (1985-02-01), Mallory
patent: 4686423 (1987-08-01), Eydt
patent: 4739226 (1988-04-01), Murata

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