Electric circuit for portable heater
First Claim
1. An electric circuit of a heater said electric circuit comprising at least a first heating element and a second heating element, a fan motor connected in series with each of said heating elements, a multi-position switch which selectively connects a power input means with said heating elements and said fan induction motor, said multi-position switch in a first position providing a first circuit connecting said power input means and said first heating element and said fan induction motor in series and causing said fan motor to operate at a first speed and causing said first heating element to produce heat at a first power, said multi-position switch in a second position disconnecting said first circuit and providing a second circuit connecting said power input means and said second heating element and said fan motor in series and causing said fan motor to operate at a second speed greater than said first speed and causing said second heating element to produce heat at a second power greater than said first rate of power, whereby the fan motor speed is automatically increased with increased power of said heating elements.
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Accused Products
Abstract
A heater effectively uses a current controlled fan motor in series with a resistance heating arrangement. The fan motor preferably is wound with a gauge of wire to appropriate for the relatively high current provided to the fan motor. This arrangement is effectively used to adjust the fan speed to match the heat output when the heating arrangement has variable heat output. More desirable operating characteristics are achieved without increasing costs and fan motor manufacturing savings are realized. The portable heater preferably produces heat at different outputs and the current used to power the resistance heating arrangement is used to power the fan motor.
22 Citations
23 Claims
- 1. An electric circuit of a heater said electric circuit comprising at least a first heating element and a second heating element, a fan motor connected in series with each of said heating elements, a multi-position switch which selectively connects a power input means with said heating elements and said fan induction motor, said multi-position switch in a first position providing a first circuit connecting said power input means and said first heating element and said fan induction motor in series and causing said fan motor to operate at a first speed and causing said first heating element to produce heat at a first power, said multi-position switch in a second position disconnecting said first circuit and providing a second circuit connecting said power input means and said second heating element and said fan motor in series and causing said fan motor to operate at a second speed greater than said first speed and causing said second heating element to produce heat at a second power greater than said first rate of power, whereby the fan motor speed is automatically increased with increased power of said heating elements.
- 6. A heater circuit for an electric heater comprising at least a first heating element generating heat at a first power and a second heating element generating heat at a second power greater than said first power, a fan induction motor connected in series with each of said heating elements, a multi-position switch which selectively connects a power input means with said heating elements and said fan induction motor, said multi-position switch in a first position connecting said power input means and said first heating element and said fan induction motor in series in a first circuit and causing said fan motor to operate at a first speed, said multi-position switch in a second position disconnecting said first circuit and connecting said power input means and said second heating element and said fan induction motor in series in a second circuit and causing said fan motor to operate at a second speed greater than said first speed, whereby the fan motor speed is automatically increased with increased power of said heating elements.
- 18. An electric circuit of a portable heater comprising a fan induction motor positioned in series with a plurality of heating elements, a multi-position switch for selectively connecting said heating elements in series with a power source and said fan induction motor to produce different heat outputs, said fan induction motor being regulated by said heating elements to automatically alter the fan induction motor speed in proportion to the heat output.
- 21. A heater comprising an electric circuit which powers a resistance heating arrangement of selectable resistance heaters and an electric fan, and wherein the electric fan receives and is powered only by current which flows through and powers selected one or ones of said selectable resistance heaters of the resistance heating arrangement.
Specification