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EP0420523A2
Expired / Lapsed
EP
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Heater control system
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1990-09-21
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Granted: —
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Expires: 2010-09-21
Abstract
Abstract A heater control system has a control circuit actuated in dependence upon an operation variable, such as time or heater temperature, to regulate the action of phase control means (4,5 or 4,11) in an AC power supply to the heater. Such regulation may be related to a transition period following the closing of the power supply circuit, or to the temperature of the heater (3), in order to limit surge currents when the heater is switched on. The system may be employed in an image forming apparatus wherein an image transferred onto paper is fixed thereto by being heated with a heater, the system controlling the heater so as to limit the power supply thereto when it detects that the power being used by other elements of the apparatus would otherwise give a total power consumption in excess of a predetermined maximum.
Inventors
- 👤 Akihiro Takada
- 👤 Kunihiro Onishi
- 👤 Yoshihiro Nakajima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 06:28
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/1909; G05D23/20; G05D23/24; Y; Y10; Y10S; Y10S323/00; Y10S323/901
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
83 words
A system for controlling a heater characterized in that the system comprises signal generating means for outputting a period signal corresponding to a transition period following the closing of a power supply, phase control means connected between the power supply and the heater for phase-controlling the current to be supplied to the heater only during the output period of the signal generating means, and shorting means for short-circuiting the phase control means after the output period to supply a current to the heater.
Claim 2
Independent Claim
83 words
A system for controlling a heater characterized in that the system comprises signal generating means for outputting a period signal corresponding to a transition period following the closing of a power supply, phase control means connected between the power supply and the heater for phase-controlling the current to be supplied to the heater only during the output period of the signal generating means, and shorting means for short-circuiting the phase control means after the output period to supply a current to the heater.
Claim 3
Dependent Claim
20 words
A system as defined in claim 1 wherein the phase control means provides a delay time shorted successively with time.
Claim 4
Dependent Claim
16 words
A system as defined in claim 1 wherein the phase control means effects definite phase control.
Claim 5
Independent Claim
82 words
A system for controlling a heater characterized in that the system comprises temperature sensor means for detecting the temperature of the heater, phase control means connected between a power supply and the heater to supply a current to the heater with a delay period successively shortened with a rise in the temperature of the heater, and shorting means for short-circuiting the phase control means when the heater temperature is not lower than a set temperature to supply a current to the heater.
Claim 6
Independent Claim
82 words
A system for controlling a heater characterized in that the system comprises temperature sensor means for detecting the temperature of the heater, phase control means connected between a power supply and the heater to supply a current to the heater with a delay period successively shortened with a rise in the temperature of the heater, and shorting means for short-circuiting the phase control means when the heater temperature is not lower than a set temperature to supply a current to the heater.
Claim 7
Dependent Claim
86 words
In an image forming apparatus wherein an image transferred onto paper is fixed thereto by being heated with a heater, a system for controlling the heater characterized in that the system comprises power sensor means for detecting the period during which the power used is in excess of predetermined power, and power control means for phase-controlling the power to be supplied to the heater only during the output period of the power sensor means so that the power used is not greater than the predetermined power.
Claim 8
Dependent Claim
86 words
In an image forming apparatus wherein an image transferred onto paper is fixed thereto by being heated with a heater, a system for controlling the heater characterized in that the system comprises power sensor means for detecting the period during which the power used is in excess of predetermined power, and power control means for phase-controlling the power to be supplied to the heater only during the output period of the power sensor means so that the power used is not greater than the predetermined power.
Claim 9
Independent Claim
55 words
A system for controlling an electrical heater wherein a control circuit is actuated in dependence upon an operation variable, such as period of operation or heater temperature, to regulate the action of phase control means in an AC power supp!y to the heater to limit the input to the heater in accordance with said variable.
Claim 10
Independent Claim
55 words
A system for controlling an electrical heater wherein a control circuit is actuated in dependence upon an operation variable, such as period of operation or heater temperature, to regulate the action of phase control means in an AC power supp!y to the heater to limit the input to the heater in accordance with said variable.
References Cited (Backward Citations)
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