US5789723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduced flicker fusing system for use in electrophotographic printers and copiers
Assignee: HP Inc
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Filing: 1996-08-23
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Granted: 1998-08-04
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Expires: 2016-08-23
Abstract
Abstract A new linear power control topology coupled with simple control techniques are presented which virtually eliminate the flicker problem as well as providing excellent power quality over a wide range of power levels. A modified one dimensional LMS control system similar to the standard LMS algorithm with multiple operating points and gain scheduling is also described which when combined with the new power control topology yield a dramatic reduction in flicker while yielding a universal voltage interface for world wide use.
Inventors
- 👤 B. Mark Hirst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:50
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/80; G03G15/20; G03G15/2003
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
81 words
An apparatus for regulating an amount of power a heating element consumes, said apparatus comprising: a power source; a full-wave rectifier; an inductor connected to said full-wave rectifier, said heating element connected to said inductor; a capacitor connected to said inductor and said full-wave rectifier; a switch connected to said heating element and said full-wave rectifier; and a controller means connected to said switch for turning said switch off and on thereby regulating said amount of power to said heating element.
Claim 2
Independent Claim
81 words
An apparatus for regulating an amount of power a heating element consumes, said apparatus comprising: a power source; a full-wave rectifier; an inductor connected to said full-wave rectifier, said heating element connected to said inductor; a capacitor connected to said inductor and said full-wave rectifier; a switch connected to said heating element and said full-wave rectifier; and a controller means connected to said switch for turning said switch off and on thereby regulating said amount of power to said heating element.
Claim 3
Dependent Claim
32 words
The apparatus of claim 1 further comprising: a means for sensing temperature of said heating element, said controller means turning said switch off and on in accordance with said means for sensing.
Claim 4
Dependent Claim
19 words
The apparatus of claim 1 further comprising: a means for absorbing excess energy during said switching of said switch.
Claim 5
Dependent Claim
14 words
The apparatus of claim 1 wherein said power source further comprising a bridge rectifier.
Claim 6
Dependent Claim
15 words
The apparatus of claim 1 wherein said heating element is used in an electrophotographic device.
Claim 7
Dependent Claim
13 words
The apparatus of claim 1 wherein said heating element is a resistive device.
Claim 8
Dependent Claim
13 words
The apparatus of claim 1 wherein said heating element is an incandescent light.
Claim 9
Dependent Claim
60 words
The apparatus of claim 2 wherein: said power source operating at a first frequency; said inductor and said capacitor having a resonate frequency that is greater than said first frequency; and said controller means pulse width modulating said switch at a PWM frequency that is greater than said resonate frequency, said amount of power being directly proportional to pulse width.
Claim 10
Dependent Claim
52 words
The apparatus of claim 8 said controller means further comprising: an error detection means for quantifying an error between a desired temperature of said heating element and said temperature of said heating element; and a processor, said processor executes a control program to control said pulse width modulation to minimize said error.
Claim 11
Independent Claim
106 words
An apparatus for heating a heating element to a desired temperature, said apparatus comprising: a power source; a full-wave rectifier; a switch connected to said heating element and said full-wave rectifier; an inductor connected to said full-wave rectifier, said heating element connected to said inductor; a capacitor connected to said inductor and said full-wave rectifier; an error detection means for quantifying an error between said desired temperature of said heating element and said temperature of said heating element; and a processor, said processor executes a control program to generate a pulse width modulation signal to minimize said error, said pulse width modulation signal controls said switch.
Claim 12
Independent Claim
106 words
An apparatus for heating a heating element to a desired temperature, said apparatus comprising: a power source; a full-wave rectifier; a switch connected to said heating element and said full-wave rectifier; an inductor connected to said full-wave rectifier, said heating element connected to said inductor; a capacitor connected to said inductor and said full-wave rectifier; an error detection means for quantifying an error between said desired temperature of said heating element and said temperature of said heating element; and a processor, said processor executes a control program to generate a pulse width modulation signal to minimize said error, said pulse width modulation signal controls said switch.
Claim 13
Dependent Claim
19 words
The apparatus of claim 10 further comprising: a means for absorbing excess energy during said switching of said switch.
Claim 14
Dependent Claim
47 words
The apparatus of claim 10 wherein: said power source operating at a first frequency; said inductor and said capacitor having a resonate frequency that is greater than said first frequency; and said pulse width modulating operating at a PWM frequency that is greater than said resonate frequency.
Claim 15
Dependent Claim
24 words
The apparatus of claim 12 wherein said processor increases a duty cycle of said pulse width modulation signal when said desired temperature is increased.
Claim 16
Dependent Claim
15 words
The apparatus of claim 10 wherein said heating element is used in an electrophotographic device.
Claim 17
Dependent Claim
13 words
The apparatus of claim 10 wherein said heating element is an incandescent light.
Claim 18
Dependent Claim
77 words
A circuit for controlling a temperature of a heat fixing device for use in an image forming apparatus, said circuit comprising: an inductor connected to a full-wave rectifier, said heat fixing device connected to said inductor; a capacitor connected to said inductor and said full-wave rectifier; a switch connected to said heat fixing device and said full-wave rectifier; and a controller means connected to said switch for turning said switch off and on thereby controlling said temperature.
Claim 19
Dependent Claim
77 words
A circuit for controlling a temperature of a heat fixing device for use in an image forming apparatus, said circuit comprising: an inductor connected to a full-wave rectifier, said heat fixing device connected to said inductor; a capacitor connected to said inductor and said full-wave rectifier; a switch connected to said heat fixing device and said full-wave rectifier; and a controller means connected to said switch for turning said switch off and on thereby controlling said temperature.
Claim 20
Dependent Claim
38 words
The circuit of claim 16 wherein said heat fixing device further comprising a means for sensing temperature of said heat fixing device, said controller means turning said switch off and on in accordance with said means for sensing.
Claim 21
Dependent Claim
50 words
The circuit of claim 16 wherein: said power source operating at a first frequency; said inductor and said capacitor having a resonate frequency that is greater than said first frequency; and said controller means pulse width modulating said switch at a PWM frequency that is greater than said resonate frequency.
Claim 22
Dependent Claim
54 words
The circuit of claim 18 said controller means further comprising: an error detection means for quantifying an error between a desired temperature of said heat fixing device and said temperature of said heat fixing device; and a processor, said processor executes a control program to control said pulse width modulation to minimize said error.
Claim 23
Dependent Claim
19 words
The circuit of claim 16 further comprising a means for absorbing excess energy during said switching of said switch.
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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) | 2001-08-03 | 2002-02-02 | 2002-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-03 | 2006-02-02 | 2006-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-03 | 2010-02-02 | 2010-08-04 | $7700.00 | Window Closed / Lapsed |