Electric powered device safe from harmful electromagnetic fields

• US 5,170,043 A
• Filed: 02/21/1991
• Issued: 12/08/1992
• Est. Priority Date: 02/21/1991
• Status: Expired due to Fees

• Current Assignee: Morris C. Gunnufson
• Original Assignee: Morris C. Gunnufson
• Inventors: Gunnufson, Morris C.
• Primary Examiner(s): Walberg, Teresa J.
• Application Number:
  US07/658,973
• Time in Patent Office: 656 Days
• Field of Search: 219/212, 219/528, 219/529, 219/549, 363/39, 363/44, 363/45, 363/46
• US Class Current: 219/528
• CPC Class Codes: H05B 1/0227 Applications
• CPC Class Codes: H05B 2203/035 Electrical circuits used in resistive heating apparatus
• CPC Class Codes: H05B 3/34 flexible, e.g. heating nets or webs

Abstract

An electric powered device and method includes of a power control system (24), an alternating current to direct current converter (30) and a direct current filtering system (36). After the incoming power has been processed by these sections, the power is provided for use at the load for the intended function of the electrical system (FIG. 1). The by-pass capacitors (38) provide additional protection by grounding extraneous alternating currents at ground potential (42). The principle method here is to hold the current as steady and constant as possible to maintain a constant electromagnetic field. This process renders electromagnetic fields safe from potential hazards. Whenever current levels need to be changed for control purposes, the rates of this change are reduced as much as possible in order to reduce any stresses imposed upon any biological systems immersed in the electromagnetic field generated by the device in use.

Claims

1. A method for reducing the hazardous effects of electromagnetic fields generated from electrically powered devices, comprising the steps of:

a. converting electric current flow to be uni-directional through a device while said device is operating,

b. maintaining a constant current flow rate with respect to time during operation of said device,

c. controlling power to an electrical load of the device by use of power controls, and

d. changing said electric current flow rate gradually when operational load demands of said device require a change of current flow rate by filtering said current after said power controls.

2. An electrical powered device safe from electromagnetic field hazards, comprising:

a. process means for processing incoming electrical power such that a constant steady current is provided to a main electrical load;

b. means for reducing rapid, abrupt changes of load current to slow gradual changes to reduce harmonic content of the current induced electromagnetic fields produced by said device; and

c. further including within said device a plurality of pathways for alternating current to ground potential, said pathways being at points distributed throughout the main electrical load of said device.

3. An electrical powered load of claim 2 wherein said device is an electrical resistance heating element.

4. An electrical powered device of claim 3 wherein said device is physically placed where generated electromagnetic fields of said device may be harmful to biological organisms when electrical power supplied to said device is un-treated.

5. An electrical powered device of claim 2 wherein said device is physically placed where generated electromagnetic fields of said device may be harmful to biological organisms when electrical power supplied to said device is un-treated.

6. An electrical powered device safe from electromagnetic field hazards, comprising:

a. a direct current power source providing power to a main load

b. means coupled to said power source for reducing the electrical current intensity rate of changes for power control of said device as permitted by operational demands of said device,

c. wherein a plurality of alternating current pathways are provided to ground potential at intervals throughout the main load of said device.

7. An electrical powered device of claim 6 wherein said load is an electrical resistance heating element.

8. An electrical powered device of claim 7 wherein said device is physically placed where generated electromagnetic fields of said device may be harmful to biological organisms when electrical power supplied to said device is un-treated.

9. An electrical powered device of claim 6 wherein said device is physically placed where generated electromagnetic fields of said device may be harmful to biological organisms when electrical power supplied to said device is un-treated.

10. In an electric heating device having means for connecting a main load to a source of AC power, the improvement comprising:

(a) a DC power source coupled to said device for energizing said device with DC power in lieu of AC power,

(b) whereby a person using said electric heating device will not be subjected to an alternating electromagnetic field of the type emanating from said device when said device is powered from an AC power source,

(c) wherein a plurality of alternating current pathways are provided to ground potential at intervals throughout the main load of said device.

11. An electrical powered device of claim 10 wherein said load is an electrical resistance heating element.

12. An electrical powered device of claim 11 wherein said device is physically placed where generated electromagnetic fields of said device may be harmful to biological organisms when electrical power supplied to said device is un-treated.

13. An electrical powered device of claim 10 wherein said device is physically placed where generated electromagnetic fields of said device may be harmful to biological organisms when electrical power supplied to said device is un-treated.