04410934 is referenced by 13 patents and cites 12 patents.

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.

Title
DC Power supply for an air filter
Application Number
6/285417
Publication Number
4410934
Application Date
July 22, 1981
Publication Date
October 18, 1983
Inventor
Edwin E Mason
Rockbridge
OH, US
Edward J Rylicki
Powell
OH, US
James M Fowler Jr
Houston
TX, US
George H Fathauer
Mesa
AZ, US
Agent
Neuman Williams Anderson & Olson
Assignee
Masco Corporation
MI, US
IPC
B03C 3/68
H02M 3/335
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