Electronic air filtering apparatus

Details Electronic air filtering apparatus Electronic air filtering apparatus

1983-08-12

1985-06-18

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

55270, G01F 168

Patent

active

045234639

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.

REFERENCES:
patent: 2389615 (1945-11-01), Eder
patent: 2986925 (1961-06-01), Gentry, Jr. et al.
patent: 3927567 (1975-12-01), Novak et al.

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