Electronic air filtering apparatus

Details Electronic air filtering apparatus Electronic air filtering apparatus

B - Operations, Transporting

03

C

317/2.1

B03C 3/32 (2006.01) B03C 3/68 (2006.01) H02M 3/335 (2006.01)

Patent

CA 1204817

ELECTRONIC AIR FILTERING APPARATUS Abstract of the Disclosure Air filtering apparatus is disclosed which includes a filter cell having ionizing and collecting means, 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 oscil- lator 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 ther- mistors 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.

400682

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