US5773799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency induction heating power supply
Assignee: Gas Technology Institute
•
Filing: 1996-04-01
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Granted: 1998-06-30
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Expires: 2016-04-01
Abstract
Abstract A high-frequency power supply which is primarily intended for use with an inductive heating apparatus. The high-frequency power supply has a pre-regulator for emitting a constant output voltage, an inverter for generating a constant output voltage, and an output network for amplifying the constant output voltage and converting the constant output voltage to a high-frequency constant output current. The power supply disclosed generates a very high frequency ac output, drives a wide range of possible loads, minimizes root mean square input current for a given output power, and can be powered from a wide range of input power sources.
Inventors
- 👤 Mark Maxfield
- 👤 Frank A. Doljack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:45
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
83 words
A method for delivering a high-frequency constant output current to an inductive heating apparatus, the method comprising the steps of: converting a variable input voltage to a regulated output voltage with a pre-regulator; inverting the regulated output voltage to generate a high-frequency constant output voltage with an H-bridge inverter; amplifying the constant output voltage with a tuned output network; converting the amplified constant output voltage to the high-frequency constant output current; and delivering the high-frequency constant output current to the inductive heating apparatus.
Claim 2
Independent Claim
83 words
A method for delivering a high-frequency constant output current to an inductive heating apparatus, the method comprising the steps of: converting a variable input voltage to a regulated output voltage with a pre-regulator; inverting the regulated output voltage to generate a high-frequency constant output voltage with an H-bridge inverter; amplifying the constant output voltage with a tuned output network; converting the amplified constant output voltage to the high-frequency constant output current; and delivering the high-frequency constant output current to the inductive heating apparatus.
Claim 3
Dependent Claim
22 words
The method according to claim 1 wherein the regulated output voltage is inverted by passing a reactive current through the H-bridge inverter.
Claim 4
Dependent Claim
26 words
The method according to claim 2 wherein the reactive current is blocked from flowing through an intrinsic diode of a field-effect transistor within the H-bridge inverter.
Claim 5
Dependent Claim
21 words
The method according to claim 2 wherein the reactive current is provided an alternate current path through an external conducting diode.
Claim 6
Dependent Claim
15 words
The method according to claim 2 wherein the regulated output voltage is inverted at resonance.
Claim 7
Dependent Claim
19 words
The method according to claim 1 wherein the high-frequency constant output current is modulated with a line input waveform.
Claim 8
Dependent Claim
16 words
The method according to claim 1 wherein the high-frequency constant output current follows a square wave.
Claim 9
Dependent Claim
16 words
The method according to claim 1 wherein the high-frequency constant output current follows a sinusoidal wave.
Claim 10
Dependent Claim
116 words
In combination, an induction heating apparatus and an induction heating power supply for receiving a variable input voltage and emitting a high-frequency constant output current to the induction heating apparatus, the induction heating power supply comprising: a pre-regulator receiving the variable input voltage and converting the variable input voltage to a regulated output voltage; an H-bridge inverter receiving the regulated output voltage and generating a high-frequency constant output voltage, the H-bridge inverter connected with respect to the pre-regulator; and a tuned output network amplifying the constant output voltage and converting the constant output voltage to the high-frequency constant output current, the tuned output network connected with respect to the H-bridge inverter and the induction heating apparatus.
Claim 11
Dependent Claim
116 words
In combination, an induction heating apparatus and an induction heating power supply for receiving a variable input voltage and emitting a high-frequency constant output current to the induction heating apparatus, the induction heating power supply comprising: a pre-regulator receiving the variable input voltage and converting the variable input voltage to a regulated output voltage; an H-bridge inverter receiving the regulated output voltage and generating a high-frequency constant output voltage, the H-bridge inverter connected with respect to the pre-regulator; and a tuned output network amplifying the constant output voltage and converting the constant output voltage to the high-frequency constant output current, the tuned output network connected with respect to the H-bridge inverter and the induction heating apparatus.
Claim 12
Dependent Claim
16 words
The induction heating power supply according to claim 9 wherein the pre-regulator comprises a buck regulator.
Claim 13
Dependent Claim
16 words
The induction heating power supply according to claim 9 wherein the pre-regulator comprises a switch-mode converter.
Claim 14
Dependent Claim
19 words
The induction heating power supply according to claim 9 wherein the high-frequency constant output current follows a square wave.
Claim 15
Dependent Claim
19 words
The induction heating power supply according to claim 9 wherein the high-frequency constant output current follows a sinusoidal wave.
Claim 16
Dependent Claim
51 words
The induction heating power supply according to claim 9 wherein the H-bridge inverter comprises at least one field-effect transistor containing an intrinsic diode, a current blocking diode blocking a reactive current from the intrinsic diode and a conducting diode passing the reactive current through the field-effect transistor of the H-bridge inverter.
Claim 17
Dependent Claim
29 words
The induction heating power supply according to claim 9 wherein the tuned output network comprises an inductor and capacitor in series and a load in parallel with the capacitor.
Claim 18
Dependent Claim
19 words
The induction heating power supply according to claim 9 wherein the high-frequency constant output current is an alternating current.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-06-29 | 2001-12-29 | 2002-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-29 | 2005-12-29 | 2006-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-29 | 2009-12-29 | 2010-06-30 | $7700.00 | Window Closed / Lapsed |