Phase control circuit for low voltage load

Details Phase control circuit for low voltage load Phase control circuit for low voltage load

1982-10-01

1984-07-24

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Zero switching

323238, 323246, 323285, 323901, G05F 1445

Patent

active

044619901

ABSTRACT:
A phase control circuit, for energizing lower voltage loads and the like from a higher voltage A.C. source, utilizes power switching means in series with the load across the source. The load voltage and current are sampled and compared to reference values to determine if the load resistance is less than or greater than a desired value and the output voltage of an integrator is adjusted accordingly. The integrator output voltage establishes the time, after each source waveform zero crossing, at which the power switching device enables load current flow. A reset circuit prevents the power switching device from conducting in the event that a line zero crossing is not properly detected, to preclude damage to the switching device and/or load overvoltage. A circuit is also provided for gradually increasing load current at start-up to limit inrush currents to the load.

REFERENCES:
patent: 3621373 (1971-11-01), Mitchell et al.
patent: 3633095 (1972-01-01), Hood
patent: 4317975 (1982-03-01), Mizukawa et al.
patent: 4377739 (1983-03-01), Eckert, Jr. et al.

Affiliated with

Also associated with

Rating

Phase control circuit for low voltage load does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Phase control circuit for low voltage load, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase control circuit for low voltage load will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-99127