Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1981-07-22
1983-10-18
Pellinen, A. D.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
55105, 323903, 363 56, H02M 3335, B03C 368
Patent
active
044109342
ABSTRACT:
Air filtering apparatus includes a filter cell having ionizing and collecting structure, a high voltage power supply and control unit for supplying a high voltage to the filter cell, a separate low voltage power supply unit for supplying operating power to the high voltage power supply unit and a separate probe unit for monitoring the flow of air within a duct in which the filter cell is installed. The high voltage power supply and control unit includes an output transistor in series with a primary winding of a step-up transformer and controlled by an oscillator circuit which is operative to control and limit the output voltage and current and also the current through the output transistor. The probe unit includes a pair of thermistors and a bridge circuit and operates to provide a signal which is independent of variables other than air flow velocity. A modified apparatus is also disclosed, arranged for portable use and arranged for energization from a standard power line with no separate low voltage supply.
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Mukerjee et al., "Design of a Colpitts Push-Pull Pulsed Oscillator for Ultrasonic Pulse Echo Technique", Indian Journal of Pure & Applied Physics, vol. 12, Jul. 1974, pp. 514-518, I083-7415-V, 331-185.
Fathauer George H.
Fowler, Jr. James M.
Mason Edwin E.
Rylicki Edward J.
Masco Corporation
Pellinen A. D.
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