Electric blanket system with reduced electromagnetic field

Details Electric blanket system with reduced electromagnetic field Electric blanket system with reduced electromagnetic field

1993-11-30

1995-04-25

Walberg, Teresa J.

Electric heating

Heating devices

Combined with diverse-type art device

219528, H05B 334

Patent

active

054101271

ABSTRACT:
An electric blanket system which runs from an AC power input, and does not use a transformer; but the power supply is rectified and regulated, to reduce the AC component of current by 90% or more (preferably 99% or more). The blanket itself uses a field-cancelling resistor layout, to achieve a further reduction of 95% or more (preferably 99% or more). The combination of these techniques provides a reasonably cheap way to bring the low-frequency magnetic field strength down to acceptable levels.

REFERENCES:
patent: 4908497 (1990-03-01), Hjortsberg
patent: 4998006 (1991-03-01), Perlman
patent: 5036177 (1991-07-01), Pagliarini
patent: 5081341 (1992-01-01), Rowe
patent: 5151577 (1992-09-01), Aspden
patent: 5170043 (1992-12-01), Gunnufson
patent: 5218185 (1993-06-01), Gross

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