G - Physics – 05 – F
Patent
G - Physics
05
F
323/4
G05F 1/44 (2006.01) G05F 1/13 (2006.01)
Patent
CA 1191894
Abstract The invention is a stabilizer circuit which allows a ferroresonant power supply to maintain a relatively steady output voltage during input power line transients or interrupts, rapid load changes, or no load conditions without requiring a continuously dissipative minimum load. In the power supply a saturating transformer 11 is responsive to an input voltage. A secondary circuit is responsive to the saturating transformer and outputs a regulated voltage. A stabilization circuit 30 responsive to the regulated output voltage temporarily places a load across the secondary circuit output when the stabilization circuit 30 senses an unstable condition. The stabilization circuit 30 is composed of a sensing circuit 31, a timing circuit 33, a switch T and a load R2. The sensing circuit 31 senses an unstable condition at the secondary circuit output. When such a condition is detected, the timing circuit 33 is activated by the sensing circuit 31. The timing circuit 33 activates the switching means T to place the load R2 across the output of the secondary circuit for a time period determined by the timing circuit 33 and the sensing circuit 31. The presence of the load R2 brings the ferroresonant power supply out of the unstable condition and returns the regulated voltage output to within an acceptable range.
427132
Gowling Lafleur Henderson Llp
Motorola Inc.
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