USRE45826E1 - Heater lamp control apparatus and method to detect an inputted AC voltage and providing a pulse signal to correspond thereto - Google Patents
Heater lamp control apparatus and method to detect an inputted AC voltage and providing a pulse signal to correspond thereto Download PDFInfo
- Publication number
- USRE45826E1 USRE45826E1 US12/654,900 US65490010A USRE45826E US RE45826 E1 USRE45826 E1 US RE45826E1 US 65490010 A US65490010 A US 65490010A US RE45826 E USRE45826 E US RE45826E
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- US
- United States
- Prior art keywords
- heater lamp
- pulse
- lamp control
- voltage
- inputted
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime, expires
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 42
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 29
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000023077 detection of light stimulus Effects 0.000 claims 3
- 230000008901 benefit Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/023—Industrial applications
- H05B1/0241—For photocopiers
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2039—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat with means for controlling the fixing temperature
- G03G15/2046—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat with means for controlling the fixing temperature specially for the influence of heat loss, e.g. due to the contact with the copy material or other roller
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
- G03G15/5004—Power supply control, e.g. power-saving mode, automatic power turn-off
Definitions
- the present invention relates to a heater lamp control apparatus and method, and more particularly, to a heater lamp control apparatus and method to detect an inputted AC voltage and to provide a pulse signal to correspond thereto, so that a heater lamp control signal corresponding to a phase of a voltage over a predetermined level from the inputted AC voltage may be outputted.
- an electrophotographic printer is provided with a photosensitive drum, a developing unit, a transfer unit, and a fixing unit.
- the tranfer unit is a unit to transfer onto a recording sheet of paper, an image formed on the photosensitive drum by a developing agent through the developing unit
- the fixing unit is a unit to fix the image transferred on the recording sheet.
- the fixing unit is provided to heat a surface of a fixing roller to a certain temperature.
- the fixing roller is mounted separately from a transfer roller to press and forward the recording sheet moving past the transfer roller.
- An AC voltage-driven heater lamp is generally used as a heating device to heat the surface of the fixing roller to a certain temperature.
- an AC voltage is applied to the heater lamp regardless of a phase of the applied AC voltage. Accordingly, a control unit outputs a heater lamp control signal unrelated to the phase of the AC voltage to turn on and off the application of the AC voltage, so that the phase of the AC voltage has no connection with the heater lamp control signal. Therefore, it is impossible to precisely control the applications of the AC voltage. That is, since the phases of the AC voltage may not be properly distributed, it becomes impossible to precisely control the applications of the AC voltage to be turned on and off, causing a flickering phenomenon that temporarily lowers an electric power supplied to peripheral circuits, and resulting in a problem of adversely affecting operations and stabilities of other devices provided with the peripheral circuits.
- the heater lamp control apparatus includes an AC voltage phase detection unit to detect a phase of the inputted AC voltage when a magnitude of the inputted AC voltage is over a predetermined level, a pulse signal generation unit to generate a heater lamp control pulse signal based on a result of the detected phase, and a control unit to control a drive-timing of the heater lamp based on the generated heater lamp control pulse signal.
- the pulse signal generation unit generates a pulse reference signal based on a result of the detected phase, a phase-delayed pulse delay signal based on the pulse reference signal, and the heater lamp control pulse signal based on a result of a comparison of magnitudes of the pulse reference signal and the pulse delay signal.
- the pulse signal generation unit includes a comparator to compare magnitudes of signals inputted to a positive (+) terminal and a negative ( ⁇ ) terminal thereof, and a capacitor connected to the negative terminal of the comparator, to delay a phase of the pulse reference signal and to convert the phase-delayed pulse reference signal into a pulse delay signal. If the pulse reference signal is generated and outputted to the positive and negative terminals respectively, the comparator outputs the heater lamp control pulse signal to the control unit based on a result of the magnitude comparison of the pulse reference signal inputted to the positive terminal and the pulse delay signal inputted to the negative terminal.
- the AC voltage phase detection unit includes a zener diode having one terminal connected to an AC terminal of the power input unit, to turn on when a voltage over a predetermined level is inputted, and a light-emitting element having one terminal connected to the other terminal of the zener diode, to emit light based on an input current occurring when the zener diode turns on. If the magnitude of the AC voltage is over the predetermined level, the phase detection is performed based on the light-emitting of the light-emitting element due to the input current occurring when the zener diode turns on.
- the pulse signal generation unit further includes a light-receiving element to turn on based on the light-emitting of the light-emitting element, and to generate the pulse reference signal.
- a heater lamp control method of applying an AC voltage inputted through a power input unit to a heater lamp via a power supply unit including detecting a phase of the inputted AC voltage when a magnitude of the inputted AC voltage is over a predetermined level, generating a heater lamp control pulse signal based on a result of the detection, and controlling a drive-timing of the heater lamp based on the generated heater lamp control pulse signal.
- FIG. 1 is a block diagram showing a heater lamp control apparatus, according to an embodiment of the present invention
- FIG. 2 is a view showing a circuit for the heater lamp control apparatus of FIG. 1 having an AC voltage phase detection unit and a pulse signal generation unit;
- FIGS. 3A through 3D are timing diagrams showing an input AC voltage and signals.
- FIG. 4 is a flow chart showing a heater lamp control method.
- FIG. 1 is a block diagram showing a heater lamp control apparatus, according to an embodiment of the present invention.
- the heater lamp control apparatus includes an power input unit 110 , a power supply unit 120 , an AC voltage phase detection unit 130 , a pulse signal generation unit 140 , a control unit 150 , a fixing unit circuit 160 , and a heater lamp 170 .
- the power input unit 110 refers in general to a power cord, and an AC voltage inputted through the power input unit 110 is outputted to the AC voltage phase detection unit 130 and the power supply unit 120 , respectively.
- the power supply unit 120 for example, a switching mode power supply (SMPS), is a power supply device to generate various voltages necessary for a printer, and supplies a voltage to the fixing unit circuit 160 to be described later.
- SMPS switching mode power supply
- the power supply unit 120 is 110V/220V-switchable.
- the AC voltage phase detection unit 130 detects a magnitude of an AC voltage according to a phase of the AC voltage based on the inputted AC voltage, and detects the phase if a corresponding voltage satisfies a predetermined condition. That is, if the magnitude of the detected AC voltage is over a predetermined level, the AC voltage phase detection unit 130 detects a phase of the AC voltage, and generates a pulse reference signal based on a detected result. Further, the generated pulse reference signal is outputted to the pulse signal generation unit 140 .
- the predetermined level may be adjusted depending upon an amount of power supply.
- the pulse signal generation unit 140 generates a pulse delay signal based on an inputted pulse reference signal. Further, the pulse signal generation unit 140 compares magnitudes of the generated pulse delay signal and the inputted pulse reference signal. Thereafter, the pulse signal generation unit 140 generates a heater lamp control pulse signal based on a difference of the magnitudes. The generated heater lamp control pulse signal is outputted to the control unit 150 .
- the control unit 150 is a unit to control a printer.
- the control unit 150 controls the fixing unit circuit 160 based on the inputted heater lamp control pulse signal. That is, the control unit 150 controls the fixing unit circuit 160 to be switched on and off according to pulses in the heater lamp control pulse signal so that a voltage supplied from the power supply unit 120 is applied to the heater lamp 170 .
- the heater lamp 170 may be built in a predetermined location, for example, in a fixing roller, to heat the fixing roller (not shown).
- FIG. 2 is a view showing a circuit for the heater lamp control apparatus of FIG. 1 having an AC voltage phase detection unit and a pulse signal generation unit according to an embodiment of the present invention
- FIGS. 3A through 3D are timing diagrams showing an input AC voltage and signals.
- An AC voltage inputted through the power input unit 110 is inputted through a first AC terminal 111 and a second AC terminal 112 . Further, a predetermined phase is detected depending upon a magnitude of the inputted voltage through the AC voltage phase detection unit 130 .
- the AC voltage phase detection unit 130 has a zener diode ZD 1 , a resistor R 1 , a light-emitting diode PC- 1 , and a diode D 1 connected in series between the first AC terminal 111 and the second AC terminal 112 in order for electrical current to flow from the first AC terminal 111 to the second AC terminal 112 .
- the light-emitting diode PC- 1 is one element of a photo-coupler PC paired with a photo transistor PC- 2 of the pulse signal generation unit 140 .
- a trigger voltage of the zener diode ZD 1 is set to a predetermined level.
- the AC voltage phase detection unit 130 in a case in which a magnitude of a voltage at every phase of the input voltage is over the trigger voltage of the zener diode ZD 1 (that is, over the predetermined level), allows an electrical current to flow therethrough, and, accordingly, the electrical current flows into the light-emitting diode PC- 1 so that the light-emitting diode PC- 1 is lit. Further, when the light-emitting diode PC- 1 is lit, the photo transistor PC- 2 of the pulse signal generation unit 140 is turned on. On the contrary, in a case in which the magnitude of the voltage is below the predetermined level, the zener diode ZD 1 is turned off so that a current path is not formed.
- the pulse signal generation unit 140 has one terminal connected to the power supply unit 120 and the other terminal connected to the control unit 150 .
- a resistor R 2 and the photo transistor PC- 2 are connected in series between one terminal connected to the power supply unit 120 and a junction node 141 .
- the other terminal connected to the control unit 150 is connected to an output terminal of a comparator. Branches are formed in parallel from the junction node 141 for positive (+) and negative ( ⁇ ) terminals of the comparator.
- a zener diode ZD 2 and a resistor R 3 are connected in series to a first branch 145 which is a branch connected to the positive terminal of the comparator.
- a resistor R 4 is connected to a second branch 146 which is a branch connected to the negative terminal of the comparator, and a capacitor Cb with one terminal grounded is connected between the resistor R 4 and the negative terminal of the comparator.
- the zener diode ZD 2 is disposed to reduce a magnitude of a constant input voltage, and the resistors R 2 , R 3 , and R 4 are disposed to drop voltage levels.
- the photo transistor PC- 2 is turned on according to the light-emitting of the light-emitting diode PC- 1 , which is a light-emitting element of the AC voltage phase detection unit 130 , and, accordingly, a pulse reference signal, which is a rectangular pulse signal, is generated.
- the generated pulse reference signal is inputted to the first and second branches 145 and 146 via the junction node 141 , respectively.
- the pulse reference signal is a rectangular pulse signal that makes the pulse reference signal “high” in a region for an AC voltage to have a voltage over the trigger voltage of the zener diode ZD 1 .
- the inputted pulse reference signal is inputted via the first branch 145 to the positive terminal of the comparator without any phase delay.
- the pulse reference signal is temporarily delayed in phase via the second branch 146 while the capacitor Cb is charged, and inputted to the negative terminal of the comparator in a phase-delayed state.
- the phase-delayed pulse reference signal is referred to as a pulse delay signal in the present invention.
- the capacitor Cb serves as a buffer, and may vary its capacity depending upon a pulse width of the heater lamp control pulse signal.
- the comparator compares the pulse reference signal and the pulse delay signal that are respectively inputted to the positive and negative terminals thereof, and generates and outputs a predetermined heater lamp control pulse signal to the control unit 150 .
- the heater lamp control pulse signal is generated as follows. That is, only the pulse reference signal is inputted to the positive terminal of the comparator while the pulse delay signal is delayed by the capacitor Cb, so a signal of “high” is outputted from the output terminal of the comparator. Further, if the capacitor Cb at the negative terminal side is completely charged, a voltage of the pulse reference signal is dropped by a predetermined amount at the positive terminal side due to the zener diode ZD 2 . Thus, the pulse reference signal at the negative terminal becomes larger than the pulse reference signal at the positive terminal, and a signal of “low” is outputted from the output terminal of the comparator, generating the heater lamp control pulse signal.
- the control unit 150 outputs a heater lamp control signal to control the fixing unit circuit 160 to be turned on and off based on a predetermined heater lamp control pulse signal.
- the fixing unit circuit 160 is connected between a terminal 161 of the heater lamp 170 and the first AC terminal 111 , and the fixing unit circuit 160 has a branch to connect a capacitor C 1 and a resistor R 5 , a triac Ta 1 connected in parallel with the branch, and a photo triac PTa 1 to trigger a gate terminal of the triac Ta 1 .
- a light-emitting diode PTa 2 paired with the photo triac PTa 1 is mounted to emit light by the heater lamp control signal of the control unit 150 .
- the terminal 161 of the heater lamp 170 is electrically connected or disconnected with an inductor L 1 connected to the first AC terminal 111 by the photo triac Ta 1 that turns on and off depending upon whether or not the light-emitting diode PTa 2 emits light according to the heater lamp control signal of the controller 150 .
- the inductor, capacitor, and resistor denoted with the reference numerals L 1 , C 1 , and R 5 , respectively, are used for noise elimination and frequency compensation.
- the heater lamp control apparatus controls the application of an AC voltage to the heater lamp 170 based on the output signals of the AC voltage phase detection unit 130 and the pulse signal generation unit 140 .
- FIG. 2 and FIGS. 3A through 3D a process to generate the heater lamp control pulse signal based on the heater lamp control signal is shown.
- FIG. 3A shows a waveform of the inputted AC voltage signal.
- a signal having a waveform such as the pulse reference signal of FIG. 3B passes through the first node 141 of the pulse signal generation unit 140 of FIG. 2
- a signal having a waveform such as the pulse delay signal of FIG. 3C passes through the second node 143
- a signal having a waveform such as the heater lamp control pulse signal of FIG. 3D passes through the third node 144 .
- FIG. 4 is a flow chart showing a heater lamp control method, according to an embodiment of the present invention.
- An AC voltage is inputted through the power input unit 110 (in operation S 200 ).
- the AC voltage phase detection unit 130 detects a magnitude of the inputted AC voltage at every phase (in operation S 210 ). Further, the AC voltage phase detection unit 130 decides whether the detected voltage magnitude is over a predetermined level (in operation S 220 ). If the detected voltage magnitude is not over the predetermined level, the AC voltage phase detection unit 130 detects a voltage magnitude at the next phase for the decision. If the detected voltage magnitude is over the predetermined level, the AC voltage phase detection unit 130 transfers a result to the pulse signal generation unit 140 . The pulse signal generation unit 140 generates a pulse reference signal based on the transferred result (in operation S 230 ).
- the comparator compares the magnitudes of the generated pulse reference signal and a phase-delayed pulse delay signal, and generates and outputs a heater lamp control pulse signal to the control unit 150 (in operation S 240 ). Thereafter, the control unit 150 generates a heater lamp control signal based on the heater lamp control pulse signal to control the fixing unit circuit 160 and the heater lamp 170 (in operations S 250 and S 260 ).
- the present invention selects a voltage supplied from the input voltage to the heater lamp so that only predetermined high voltages are applied to the heater lamp. Accordingly, the heater lamp control apparatus of the present invention minimizes a flickering phenomenon which may occur in peripheral devices as well as an amount of electric power the heater lamp consumes.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Control Of Resistance Heating (AREA)
- Fixing For Electrophotography (AREA)
Abstract
Description
Claims (22)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/654,900 USRE45826E1 (en) | 2003-05-19 | 2010-01-07 | Heater lamp control apparatus and method to detect an inputted AC voltage and providing a pulse signal to correspond thereto |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2003-0031680A KR100512962B1 (en) | 2003-05-19 | 2003-05-19 | A controlling apparatus and a controlling method of heater lamp provided with pulse signal corresponding to detected input AC voltage |
KR10-2003-0031680 | 2003-05-19 | ||
US10/781,655 US7329840B2 (en) | 2003-05-19 | 2004-02-20 | Heater lamp control apparatus and method to detect an inputted AC voltage and providing a pulse signal to correspond thereto |
US12/654,900 USRE45826E1 (en) | 2003-05-19 | 2010-01-07 | Heater lamp control apparatus and method to detect an inputted AC voltage and providing a pulse signal to correspond thereto |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/781,655 Reissue US7329840B2 (en) | 2003-05-19 | 2004-02-20 | Heater lamp control apparatus and method to detect an inputted AC voltage and providing a pulse signal to correspond thereto |
Publications (1)
Publication Number | Publication Date |
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USRE45826E1 true USRE45826E1 (en) | 2015-12-22 |
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US10/781,655 Ceased US7329840B2 (en) | 2003-05-19 | 2004-02-20 | Heater lamp control apparatus and method to detect an inputted AC voltage and providing a pulse signal to correspond thereto |
US12/654,900 Expired - Lifetime USRE45826E1 (en) | 2003-05-19 | 2010-01-07 | Heater lamp control apparatus and method to detect an inputted AC voltage and providing a pulse signal to correspond thereto |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US10/781,655 Ceased US7329840B2 (en) | 2003-05-19 | 2004-02-20 | Heater lamp control apparatus and method to detect an inputted AC voltage and providing a pulse signal to correspond thereto |
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US (2) | US7329840B2 (en) |
KR (1) | KR100512962B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150144300A1 (en) * | 2013-11-22 | 2015-05-28 | Thermo Fisher Scientific (Asheville) Llc | Recirculating Bath With Global Voltage Compatibility |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100846785B1 (en) | 2006-03-14 | 2008-07-16 | 삼성전자주식회사 | Method and apparatus for controlling power for Heating Roller, and phase control citcuit of the same |
KR101217629B1 (en) * | 2006-03-22 | 2013-01-02 | 삼성전자주식회사 | Phase control circuit, apparatus and method for controlling heater lamp using the same |
KR101235220B1 (en) | 2006-07-28 | 2013-02-20 | 삼성전자주식회사 | Phase detectiom device and phase controlling device having the same and fuser controlling device |
JP6308771B2 (en) * | 2013-12-24 | 2018-04-11 | キヤノン株式会社 | Image forming apparatus |
JP2022028212A (en) * | 2020-08-03 | 2022-02-16 | 東芝テック株式会社 | Image forming apparatus |
CN112689356B (en) * | 2021-01-08 | 2023-11-10 | 青岛易来智能科技股份有限公司 | Switch control circuit and method and lamp |
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US3881085A (en) * | 1972-12-06 | 1975-04-29 | Xerox Corp | Fuser control circuit for copying apparatus |
US5483149A (en) * | 1993-10-28 | 1996-01-09 | Hewlett-Packard Company | Resistive heating control system and method that is functional over a wide supply voltage range |
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JPH10333490A (en) | 1997-05-30 | 1998-12-18 | Canon Inc | Image forming device and power controlling method |
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KR20010048868A (en) | 1999-11-30 | 2001-06-15 | 윤종용 | Apparatus for free voltage of fixations device |
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- 2003-05-19 KR KR10-2003-0031680A patent/KR100512962B1/en active IP Right Grant
-
2004
- 2004-02-20 US US10/781,655 patent/US7329840B2/en not_active Ceased
-
2010
- 2010-01-07 US US12/654,900 patent/USRE45826E1/en not_active Expired - Lifetime
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JPH086434A (en) | 1994-06-22 | 1996-01-12 | Canon Inc | Heating device and image forming device |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150144300A1 (en) * | 2013-11-22 | 2015-05-28 | Thermo Fisher Scientific (Asheville) Llc | Recirculating Bath With Global Voltage Compatibility |
Also Published As
Publication number | Publication date |
---|---|
KR100512962B1 (en) | 2005-09-07 |
US7329840B2 (en) | 2008-02-12 |
US20040232138A1 (en) | 2004-11-25 |
KR20040099635A (en) | 2004-12-02 |
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