U.S. patent application number 11/015275 was filed with the patent office on 2006-06-22 for heating system and heater.
Invention is credited to David W. Baarman.
Application Number | 20060132045 11/015275 |
Document ID | / |
Family ID | 36143203 |
Filed Date | 2006-06-22 |
United States Patent
Application |
20060132045 |
Kind Code |
A1 |
Baarman; David W. |
June 22, 2006 |
Heating system and heater
Abstract
An inductively power heating system includes an inductive power
source for supplying power to an inductive heater. The inductive
heater may include a resistive heater and a multiple coil
secondary. A heater control within the inductive heater may control
the power supplied to the resistive heater, and thereby control the
temperature of the resistive heater. The inductive heater may
encapsulate the resistive heater, the multiple coil secondary and
the heater control, thereby providing a sealed, inductive
heater.
Inventors: |
Baarman; David W.;
(Fennville, MI) |
Correspondence
Address: |
WARNER, NORCROSS & JUDD;IN RE: ALTICOR INC.
INTELLECTUAL PROPERTY GROUP
111 LYON STREET, N. W. STE 900
GRAND RAPIDS
MI
49503-2489
US
|
Family ID: |
36143203 |
Appl. No.: |
11/015275 |
Filed: |
December 17, 2004 |
Current U.S.
Class: |
315/94 |
Current CPC
Class: |
H05B 1/02 20130101; H01F
38/14 20130101 |
Class at
Publication: |
315/094 |
International
Class: |
H05B 39/00 20060101
H05B039/00 |
Claims
1. A heating system comprising: an adaptive inductive power supply;
and a heater receiving electrical power inductively from the
adaptive inductive power supply.
2. The heating system of claim 1 where the heater further comprises
a multiple coil secondary for receiving electrical power from the
adaptive inductive power supply.
3. The heating system of claim 2 where the heater has a heating
element.
4. The heating system of claim 3 where the heating element is one
of self-limiting parallel circuit heating tape, insulated
resistance wire, flexible foil heaters, wire-wound rubber heaters,
insulated flexible heater, and silicon rubber heater.
5. The heating system of claim 4 where the heater has a heater
control.
6. The heating system of claim 5 where the heater has a capacitor
arranged to improve energy transfer from the adaptive inductive
power supply to the heater.
7. The heating system of claim 1 where the adaptive inductive power
supply has a power supply transceiver and the heater has a heater
receiver for receiving communication from the adaptive inductive
power supply.
8. The heating system of claim 1 where the adaptive inductive power
supply has a power supply receiver and the heater has a heater
transmitter for sending communication to the adaptive inductive
power supply.
9. The heating system of claim 1 where the adaptive inductive power
supply has a transceiver and the heater has a transceiver for
communicating with the adaptive inductive power supply.
10. The heating system of claim 9 where the heater further
comprises a controller.
11. The heating system of claim 10 where the heater further
comprises a temperature sensor.
12. The heating system of claim 1 1 where the heater further
comprises a memory.
13. The heating system of claim 3 where the heater is hermetically
sealed.
14. The heating system of claim 3 where the heater is encapsulated
within a plastic enclosure.
15. An inductively powered heater comprising: a secondary for
receiving power; and an electrically resistive heater.
16. The inductively powered heater of claim 15 further comprising:
an enclosure having an exterior surface, the secondary being
positioned within the enclosure and the electrically resistive
heater positioned proximal to the exterior surface.
17. The inductively powered heater of claim 16 where the
electrically resistive heater is positioned outside of the
enclosure.
18. The inductively powered heater of claim 16 where the
electrically resistive heater is positioned inside the
enclosure.
19. The inductively powered heater of claim 16 further comprising a
propulsion system.
20. The inductively powered heater of claim 19 where the propulsion
system includes an electric motor.
21. The inductively powered heater of claim 20 where the
electrically resistive heater is one of self-limiting parallel
circuit heating tape, insulated resistance wire, flexible foil
heaters, wire-wound rubber heaters, insulated flexible heater, and
silicon rubber heater.
22. An inductively powered heater comprising: an inductive
secondary for receiving power; an electrically resistive heater;
and an enclosure containing the inductive secondary and the
electrically resistive heater such that the enclosure is fully
sealed and unpenetrated.
23. The inductively powered heater of claim 22 further comprising:
a heater control contained within the enclosure for controlling
energization of the inductively powered heater.
24. The inductively powered heater of claim 23 further comprising
an adjustable impendence, the adjustable impedance being adjustable
so as to alter power transferred from a primary to the inductive
secondary.
25. The inductively powered heater of claim 24 further comprising a
controller for controlling the adjustable impendence.
26. The inductively powered heater of claim 25 where the heater
control includes a temperature sensor.
27. The inductively powered heater of claim 26 where the controller
is responsive to the temperature sensor to change the adjustable
impedance.
28. The inductively powered heater of claim 25 further comprising a
receiver, the receiver coupled to the controller, the controller
operating responsive to instructions received from the receiver to
change the adjustable impedance to control an electric current.
29. The inductively powered heater of claim 27 further comprising a
transmitter for transmitting information from the temperature
sensor.
30. The inductively powered heater of claim 29 further comprising a
propulsion system for moving the inductively powered heater.
31. The inductively powered heater of claim 30 where the propulsion
system includes an electric motor.
32. A heating system for a material comprising: an inductive
primary; and a plurality of inductive heaters, the inductive
heaters receiving power from the inductive primary.
33. The heating system of claim 32 further comprising a heater
control for controlling an electric current supplied to the
plurality of inductive heaters.
34. The heating system of claim 33 where the heater control
includes a receiver for receiving information from the plurality of
inductive heaters.
35. The heating system of claim 34 where at least one of the
plurality of inductive heaters has a transmitter for transmitting
information to the heater control.
36. An inductively powered electric heater comprising: an inductive
secondary for receiving power; an electric heater coupled to the
inductive secondary and positioned around the inductive secondary;
and an enclosure containing the secondary the electrically
resistive heater such that the enclosure is fully sealed and
unpenetrated.
37. The inductively powered electric heater of claim 36 where the
enclosure is an elastomeric material.
38. The inductively powered electric heater of claim 37 where the
elastomeric material is a thermally conductive polymer.
39. The inductively powered electric heater of claim 38 where the
thermally conductive polymer is one of liquid crystalline polymer
and polyphenylene sulfide.
40. A method for heating a device comprising the steps of:
physically coupling a heating element with the device; electrically
coupling the heating element with one or more secondary coils;
providing an electrical signal from an inductive power supply to
the secondary coil.
41. The method of claim 40, further comprising the step of coupling
a heater control with the heating element.
42. The method of claim 41, further comprising the step of coupling
a temperature sensor with the heating element.
Description
BACKGROUND OF THE INVENTION
[0001] Inductive electric heaters are in general use in several
fields, such as medicine and printing. A heating slug of metal such
as iron or steel is placed within proximity to an alternating
electrical field. The alternating field induces currents within the
slug, causing the slug to heat.
[0002] This type of electric heater has been used in a variety of
different applications. For example, the arrangement is used in
fluid heaters, such as the one shown in U.S. Pat. No. 6,118,111,
entitled "Fluid Heater" and issued to Nigel Brent Price et al. U.S.
Pat. No. 4,032,740 entitled "Two-level temperature control for
induction heating" and issued to Eugene Mittelmann shows an
induction heating apparatus for heating work pieces.
[0003] Inductive heating systems allow the heating of objects
without providing electric current directly to the object or by
running wires into the heating element, thereby allowing some
degree of isolation of the heating slug from the rest of circuitry.
However, such systems fail to provide sufficiently fine control of
the temperature for some applications, and thereby limit their
utility.
[0004] Thus, an improved induction heating system is highly
desirable.
BRIEF DESCRIPTION OF THE DRAWINGS
[0005] FIG. 1 shows an inductive heating system.
[0006] FIG. 2 shows a different embodiment for the circuit used
within inductive heater.
[0007] FIG. 3 shows inductive heater.
[0008] FIG. 4 shows a plurality of heaters suspended within the
container.
[0009] FIG. 5 shows an electric frying pan using an inductive
heating system.
[0010] FIG. 6 shows a soldering iron using an inductive heating
system.
DETAILED DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 shows an inductive heating system. Adaptive inductive
power supply 10 provides power to inductive heater 12. The
operation of adaptive inductive power supply 10 has been described
fully in patent application Ser. No. 10/689,499 and patent
application Ser. No. 10/689,148, assigned to the assignee of this
application. Both applications are hereby incorporated by
reference.
[0012] A short summary of the operation of adaptive inductive power
supply 10 is provided. Inverter 14 supplies power to tank circuit
16. Tank circuit 16 is shown as a serial resonant tank circuit, but
a parallel circuit tank circuit could also be used. Tank circuit 16
consists of tank capacitor 18, variable inductor 20 and tank
inductor 22.
[0013] While variable inductor 20 and tank inductor 22 are shown as
two separate inductors, one skilled in the art would recognize that
a single variable inductor could be substituted for the two.
Alternatively, a single fixed inductor could be used rather than a
variable inductor. Similarly, tank capacitor 18 could be either
variable or fixed.
[0014] Power source 24 energizes inverter 14. Drive circuit 26
controls the duty cycle and frequency of inverter 14. Controller 28
controls drive circuit 26 as well as tank capacitor 18 and variable
inductor 20.
[0015] Circuit sensor 30 provides information regarding the
operation of tank circuit 16 to controller 28. Memory 30 stores
information relating to the operation of power supply 10 as well as
information regarding any devices supplied power by power supply
10. Transceiver 32 is provided to allow communication between
controller 28 and any external devices. The external devices could
be devices powered by power supply 10 or the external devices could
be a computer or a network. While transceiver 32 is shown for
sending and receiving communication, transceiver 32 could be either
a transmitter or a receiver.
[0016] Inductive heater 12 is comprised of a multiple coil
secondary 40. Multiple coil secondary 40 has been described in more
detail in patent application Ser. No. 10/689,224, assigned to the
assignee of this application which is hereby incorporated by
reference. Multiple coil secondary 40 is an inductive secondary
allowing inductive heater 12 to be powered by power supply 10
irregardless of the orientation of secondary 40 with respect to
power supply 10. Alternatively, secondary 40 could be comprised of
a single coil.
[0017] Inductive heater capacitor 42 may be used to balance the
impedance of inductive heater 12 so that optimum power transfer may
occur. Heater resistor 44 heats when a sufficient electric current
is applied. Heater control 46 regulates the current supplied to
heater resistor 44, and thus regulates the heat generated by heater
resistor 44. Heater control 46 could be a thermostat or a more
complicated control.
[0018] If heater resistor 44 was a self-limiting resistor, a heater
control could be optional. A self-limiting heater adjusts the
energy generated in relation to the surface temperature and ambient
temperature. As the temperature increases the resistance within the
heater increases, thus decreasing the wattage output.
[0019] Inductive heater 12 could be within an enclosure such that
no component of inductive heater 12 would extend out of the
enclosure. The enclosure could also be hermetically sealed.
Alternatively, all of the components of inductive heater 42 could
be integrally molded together in a casing material such as a
thermally conductive plastic, such as CoolPoly Elastomer,
manufactured by Cool Polymers, Inc., Warwick, R.I. Some thermally
conductive such as CoolPoly D-Series polymers also provide
electrical isolation. Suitable materials are liquid crystalline
polymer and polyphenylene sulfide.
[0020] Heater resistor 44 could be one of several different
devices. For example, it could be a self-limiting parallel circuit
heating tape, such as the one sold by Bartec U.S. Corporation,
Tulsa, Okla.; heating tape, sold by HTS/Amptek Company, Stafford,
Tex.; insulated resistance wire, such as those sold by HTS/Amptek
Company, Stafford, Tex.; flexible foil heaters, such as those sold
by Minco Products, Inc., Minneapolis, Minn.; wire-wound rubber
heaters, such as Minco Products, Inc., Minneapolis, Minn.; Omegalux
Kapton Insulated Flexible Heaters, sold by Omega Engineering, Inc.,
Stamford, Conn.; or Omegalux Silicon Rubber Heaters, sold by Omega
Engineering, Inc., Stamford, Conn.
[0021] FIG. 2 shows another embodiment for the circuit used within
inductive heater 12. Inductive heater circuit 100 consists of
heater control 101 attached to heater element 104. Inductive heater
12 includes a multiple coil secondary 102 coupled with heater
element 104 and tank circuit 106. Multiple coil secondary 102
supplies power to power supply 108. Alternatively, secondary 120
could be single coil. Power supply 108 is then used to energize
heater transceiver 110 and controller 112. Controller 112 controls
the setting for variable capacitor 114 and variable inductor 116 to
maximize the total efficiency of inductive power supply 10.
Temperature sensor 117 provides information regarding the
temperature of the inductive heater to controller 112. Tank circuit
106 is shown as a series resonant circuit. As is well known in the
art, a parallel resonant circuit could be used in its stead.
[0022] Transceiver 110 could be a wireless transmission device
using a protocol such as Bluetooth, cellular, or IEEE 801.11.
Alternatively transceiver 110 could be either and active or passive
RFID device. Transceiver 110 may be used by the controller to send
information from temperature sensor 117 to power supply 108. While
transceiver 110 is shown for sending and receiving communication,
transceiver 32 could be a transmitter or a receiver.
[0023] Memory 118 may be used by controller 112 to control the
operation of the heater. Additionally, memory 118 may include a
unique identifier for the heater, or a range of operating
temperatures used by controller 112 to control operation of the
heater.
[0024] FIG. 3 shows inductive heater 150. Inductive heater 150
includes an inductive heater control 152 and two heating elements
154, 156. The two heating elements are affixed to the ends of
enclosure 158. Leads 160, 162 extend to heater control 152 from
heating elements 154, 156.
[0025] Heating elements 154, 156 can be affixed either to the
exterior of enclosure 158, in which case the leads would extend
though wall of enclosure 158. Alternatively, heating elements 154,
156 could be affixed to the interior of enclosure 158, in which
case leads 160, 162 would not have to penetrate the wall of
enclosure 158.
[0026] Enclosure 158 is shown as a cylinder. Obviously, other
geometrical configurations for enclosure 158 are possible, such as
a sphere or a cube. Enclosure 158 could be partially empty other
than for heater control 152. Alternatively, enclosure 158 could be
a solid.
[0027] Heating elements 154, 156 are shown as affixed to opposite
sides of enclosure 158. Additional heating elements could be
disposed on the exterior of enclosure 158, or only a single heating
element could be used. For example, a single heating element could
be disposed about the central portion of enclosure 158 rather than
having a heating element at each end of enclosure 158.
[0028] Heat sink 164 is located near the surface of enclosure 158.
It is made of a material such as copper so as to assist in the
accurate determination of the temperature outside of enclosure 158.
Heat sink 164 is coupled to heater control 152 to allow monitoring
by heater control 152 of temperatures exterior to inductive heater
150.
[0029] Inductive heater 150 could be provided with propulsion
system 166. If inductive heater 150 were for use within a fluid,
propulsion system 166 would allow the movement of inductive heater
150 within the fluid. Propulsion system 166 is shown as electric
motor 168 and propeller 170. Obviously, propulsion system 166 could
also be any one of a variety of methods such as a turbine or fan.
Alternatively, propulsion system 166 could be used to circulate
fluid around heater 150.
[0030] FIG. 4 shows a plurality of heaters 200, 202, 204 suspended
within container 206. Heaters 200, 202, 204 are shown as cubical
heaters. Heaters 200, 202, 204 could be cylindrical, spherical, or
any other suitable shape. The heating element for heaters 200, 202,
204 could be on one or more surfaces of heaters 200, 202, 204.
[0031] Inductive primary 208 is disposed about container 206.
Inductive primary 208 could be disposed at the base of container
206 or the top of container 206. Heater control 210 could be the
same or similar to inductive power supply 10 of FIG. 1.
[0032] If heaters 200, 202, 204 and heater control 210 were
supplied with transceivers, heater control 210 could energize the
heaters to maintain the contents of container 206 at a desired
temperature. When supplied with temperature sensors, heaters 200,
202, 204 send information regarding the temperature within
container 206 could be provided to heater control 210. Thus, heater
control could also monitor the temperature of the contents of
container 206.
[0033] The heaters described herein could be used in a variety of
applications. FIG. 5 shows electric frying pan 300. Frying pan 300
has inductive secondary 302 attached to heater control 304. Heater
control 304 is coupled to heating element 306. When placed near an
inductive ballast, inductive secondary 302 energizes heating
element 306. Heater control 304, located in the handle of electric
frying pan 300, regulates the energy supplied to heating element
306, and thereby controls the temperature within electric frying
pan 300.
[0034] FIG. 6 shows soldering iron 320. Heating element 322 is
coupled to controller 324. Controller 324 is located in the handle
of soldering iron 320. Inductive secondary 326 is disposed within
the handle of soldering iron 320. When inductive secondary 326 is
energized, heater control 324 provisions electrical energy to
heating element 322.
[0035] The above description is of the preferred embodiment.
Various alterations and changes can be made without departing from
the spirit and broader aspects of the invention as defined in the
appended claims, which are to be interpreted in accordance with the
principles of patent law including the doctrine of equivalents. Any
references to claim elements in the singular, for example, using
the articles "a," "an," "the," or "said," is not to be construed as
limiting the element to the singular.
* * * * *