KR20140092990A - Laser printer, apparatus and method for protecting toner fuser of laser printer - Google Patents

Laser printer, apparatus and method for protecting toner fuser of laser printer Download PDF

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Publication number
KR20140092990A
KR20140092990A KR1020130005179A KR20130005179A KR20140092990A KR 20140092990 A KR20140092990 A KR 20140092990A KR 1020130005179 A KR1020130005179 A KR 1020130005179A KR 20130005179 A KR20130005179 A KR 20130005179A KR 20140092990 A KR20140092990 A KR 20140092990A
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KR
South Korea
Prior art keywords
heating device
signal
temperature
toner fixing
control signal
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KR1020130005179A
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Korean (ko)
Inventor
이상중
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엘지전자 주식회사
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Priority to KR1020130005179A priority Critical patent/KR20140092990A/en
Publication of KR20140092990A publication Critical patent/KR20140092990A/en

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    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)

Abstract

Disclosed is a control device of a heating device of a toner fuser. A temperature control part generates an enable signal of the heating device of the toner fuser. The temperature sensor measures the temperature of the tuner fuser. A first comparison part determines whether measured temperature is higher than a reference temperature and generates a determination signal. A pull-up high pass filter filters the enable signal and generates a first control signal. A second comparison part compares the first control signal with a reference voltage and generates a comparison signal. A control signal generation part controls the heating device based on the comparison signal and the determination signal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a laser printer,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser printer, and more particularly, to an apparatus and method for protecting a toner fixing device of a laser printer.

A toner fixing device of a laser printer is a device that fixes toner, which is a developer, to a recording paper with heat. Since the fixing device uses heat, a heating device for heating the fixing device is required. However, when the heating apparatus excessively heats the fixing apparatus, damage to the fixing apparatus occurs. Therefore, a protection scheme for preventing the fixing apparatus is demanded.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus and a method for preventing a toner fixing device of a laser printer from being damaged by heat.

A control method of a heating apparatus of a toner fixing apparatus according to an embodiment of the present invention includes: generating an enable signal of a heating apparatus of a toner fixing apparatus; Measuring a temperature of the toner fixing apparatus; Determining whether the measured temperature is higher than a reference temperature, and generating a determination signal; Performing a pull-up high pass filtering on the enable signal to generate a first control signal; Comparing the first control signal with a reference voltage to generate a comparison signal; And controlling the heating device based on the determination signal and the comparison signal.

The controller of the heating apparatus of the toner fixing apparatus according to an embodiment of the present invention includes a temperature control unit for generating an enable signal of the heating apparatus of the toner fixing apparatus; A temperature sensor for measuring the temperature of the toner fixing device; A first comparing unit for determining whether the measured temperature is higher than a reference temperature and generating a determination signal; A pull-up high-pass filter for pull-up high-pass filtering the enable signal to generate a first control signal; A second comparator for comparing the first control signal with a reference voltage to generate a comparison signal; And a control signal generator for controlling the heater based on the determination signal and the comparison signal.

According to the embodiment of the present invention, even if an error occurs in the central processing unit that drives the software for controlling the heating device of the toner fixing apparatus in a state where an error occurs in a circuit including a thermistor for measuring the temperature, The heating device 200 is turned off after the elapse of a predetermined period of time to prevent damage to the toner fixing device 300 and also to prevent fire.

1 is a circuit diagram of a temperature control apparatus for a heating apparatus of a fixing apparatus according to an embodiment of the present invention.
2 is a flowchart showing the operation of the temperature control apparatus of the heating apparatus of the fixing apparatus according to one embodiment of the present invention.
3 is a circuit diagram of a pull-down high-pass filter according to an embodiment of the present invention.
4 is a graph showing pulse signal responses of a pull-down high-pass filter according to an embodiment of the present invention.
5 is a circuit diagram of a pull-up high-pass filter according to an embodiment of the present invention.
6 is a graph showing pulse signal responses of a pull-up high-pass filter according to an embodiment of the present invention.
7 is a circuit diagram of a pull-up high-pass filter having a discharge unit according to an embodiment of the present invention.
8 is a graph showing a pulse signal response of a pull-up high-pass filter having a discharge unit according to an embodiment of the present invention.
9 is a circuit diagram of a temperature control apparatus for a heating apparatus of a fixing apparatus according to another embodiment of the present invention.
10 is a flowchart showing the operation of the advanced temperature control apparatus of the heating apparatus of the fixing apparatus according to the embodiment of the present invention.
11 is a graph showing a waveform of a signal in the temperature control device according to another embodiment of the present invention.

Hereinafter, a mobile terminal related to the present invention will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

Hereinafter, a temperature control apparatus for a heating apparatus of a fixing apparatus according to an embodiment of the present invention will be described with reference to FIG.

1 is a circuit diagram of a temperature control apparatus for a heating apparatus of a fixing apparatus according to an embodiment of the present invention.

1, a temperature control apparatus 100 of a heating apparatus 200 of a fixing apparatus according to an embodiment of the present invention is connected to a control terminal of a heating apparatus 200 of a fixing apparatus, and a temperature control unit 110 A temperature sensor 120, a comparator 130, and a control signal generator 150.

The temperature control unit 110 generates an enable signal CTL1 of the heating device 200. [ When the enable signal CTL1 indicates the disable of the heating device 200, the heating device 200 is turned off. When this enable signal CTL1 indicates the enable of the heating device 200, the heating device 200 is controlled between on and off to maintain the temperature of the toner fixing device 300 at the reference temperature.

The temperature sensor 120 includes a thermistor Rt, a capacitor C1, and a resistor R1.

A thermistor (Rt) is an electrical device that uses a property that the resistance of a material changes with temperature. In an embodiment of the present invention, an NTC thermistor (Negative Temperature Coefficient Thermistor) whose resistance value decreases with temperature by a thermistor Rt is used, but need not be limited thereto. That is, in another embodiment, a positive temperature coefficient thermistor (PTC thermistor) whose resistance value increases with temperature may be used as the thermistor Rt, and when the positive temperature coefficient thermistor is used Changes in the circuit diagram may be derived by those skilled in the art on the basis of this disclosure and may be considered to be within the scope of the invention.

One end of the thermistor Rt is connected to the DC power supply VCC. One end of the resistor R1 is connected to the other end of the thermistor Rt, and the other end of the resistor R1 is connected to the ground. One end of the capacitor C1 is connected to one end of the resistor R1 and the other end of the capacitor C1 is connected to the other end of the resistor R1.

The DC voltage VCC is divided by the resistor Rt and the resistor R 1 connected in series and the divided DC voltage becomes the measurement signal CTL 2 corresponding to the measurement temperature of the toner fixing apparatus 300. The other end of the service robot Rt outputs a measurement signal CTL2 corresponding to the measurement temperature of the toner fixing apparatus 300. [

The comparator 130 includes a reference voltage generator 131 and an amplifier U1.

The reference voltage generator 131 generates the reference voltage Vref corresponding to the reference temperature. In the embodiment of FIG. 1, the reference voltage generator 131 includes a resistor R2 and a resistor R3.

One end of the resistor R2 is connected to a DC power source. One end of the resistor R3 is connected to the other end of the resistor R2, and the other end of the resistor R3 is connected to the ground. The DC power source is divided by the resistor R2 and the resistor R3 connected in series, and the divided DC voltage becomes the reference voltage Vref corresponding to the reference temperature.

The amplifier U1 can generate the determination signal CTL3 by comparing the voltage of the measurement signal CTL2 with the reference voltage Vref. The positive input terminal of the amplifier U1 is connected to the other end of the resistor R2 and the negative input terminal of the amplifier U1 is connected to the other end of the thermistor Rt.

If the reference voltage Vref corresponding to the reference temperature is higher than the voltage of the measurement signal CTL2 corresponding to the measurement temperature, the output terminal of the amplifier U1 outputs the determination signal CTL3 corresponding to the logic high. When the reference voltage Vref corresponding to the reference temperature is lower than the voltage of the measurement signal CTL2 corresponding to the measurement temperature, the output terminal of the amplifier U1 outputs the determination signal CTL3 corresponding to the logic low.

The control signal generator 150 controls the heating device 200 based on the comparison between the measured temperature and the reference temperature and the enable signal CTL1 of the heating device 200. [ The control signal generator 150 may generate a heating device on-off control signal CTL4 for controlling the heating device 200 on and off based on the determination signal CTL3 and the enable signal CTL1.

When the heating device enable signal CTL1 indicates the heating device disabled, the control signal generating section 150 can generate the heating device on / off control signal CTL4 indicating the heating device off. When the measured temperature is lower than the reference temperature, the control signal generating unit 150 generates a heating device on-off signal indicating that the heating device is turned on The control signal CTL4 can be generated. When the measured temperature is higher than the reference temperature, the control signal generating unit 150 generates a heating device on-off indicating the heating device off The control signal CTL4 can be generated.

To this end, in the embodiment of FIG. 1, the control signal generator 150 includes a NOT gate U2, a NAND gate U3, and a buffer U4.

The heating device enable signal CTL1 is applied to the input terminal of the NOT gate U2 and the NOT gate U2 inverts the heating device enable signal CTL1 to generate the inverted heating device enable signal CTL1 do. Both input terminals of the NAND gate U3 are connected to the output terminal of the amplifier U1 and the output terminal of the NOT gate U2, respectively. The NAND gate U3 performs the NAND operation with the determination signal CTL3 and the inverted heating device enable signal CTL1 to output the heating device on / off control signal CTL4. The input terminal of the buffer U4 is connected to the output terminal of the NAND gate U3 and the output terminal of the buffer U4 is connected to the control terminal of the heating device 200. [ The buffer U4 buffers the heating device on / off control signal CTL4 and provides the buffered heating device on / off control signal CTL4 to the control terminal of the heating device 200. [

The operation of the temperature control apparatus of the heating apparatus of the fixing apparatus according to one embodiment of the present invention will now be described with reference to FIG.

2 is a flowchart showing the operation of the temperature control apparatus of the heating apparatus of the fixing apparatus according to one embodiment of the present invention.

The temperature control unit 110 generates an enable signal CTL1 of the heating device 200 (S101). When the enable signal CTL1 indicates the disable of the heating device 200, the heating device 200 is turned off. When the enable signal CTL1 indicates the enable of the heating device 200, the heating device 200 is controlled between on and off to maintain the temperature of the toner fixing device 300 at the reference temperature.

The temperature control unit 110 can generate the enable signal CTL1 of the heating device 200 based on the measurement signal CTL2 corresponding to the measured temperature. The temperature control unit 110 can determine whether the measured temperature corresponding to the measurement signal CTL2 is higher than the reference temperature. When the measured temperature corresponding to the measurement signal CTL2 is lower than the reference temperature, the temperature control unit 110 can generate the heating device enable signal CTL1 instructing the heating device 200 to be enabled. When the measured temperature corresponding to the measurement signal CTL2 is higher than the reference temperature, the temperature control unit 110 can generate the heating device enable signal CTL1 indicating the disabling of the heating device 200. [

The temperature sensor 120 measures the temperature of the toner fixing apparatus 300 (S103). The temperature sensor 120 can generate the measurement signal CTL2 (CTL2) corresponding to the temperature of the toner fixing apparatus 300. [

The comparator 130 compares the measured temperature with the reference temperature, and determines whether the measured temperature is higher than the reference temperature (S105). The comparator 130 compares the voltage of the measurement signal CTL2 corresponding to the measured temperature with a reference voltage Vref corresponding to the reference temperature to generate a determination signal CTL3 indicating whether the measured temperature is higher than the reference temperature can do. The reference voltage generator 131 generates the reference voltage Vref corresponding to the reference temperature and the amplifier U1 compares the voltage of the measurement signal CTL2 with the reference voltage Vref to generate the determination signal CTL3 can do.

The control signal generator 150 controls the heating device 200 based on a comparison between the measured temperature and the reference temperature (S107). The control signal generator 150 may determine whether the measured temperature is higher than the reference temperature. If the measured temperature is higher than the reference temperature, the control signal generator 150 can turn off the heating device 200. [ If the measured temperature is lower than the reference temperature, the control signal generator 150 can turn on the heating device 200. [ The control signal generating unit 150 generates the heating device on-off control signal CTL4 based on the enable signal CTL1 and the determination signal CTL3 of the heating device 200, (CTL4) to the control terminal of the heating device 200. [ Off control signal CTL4 indicating the ON state of the heating device 200 is provided to the control terminal of the heating device 200, the heating device 200 is turned on, generates heat, and supplies the generated heat to the toner fixing device 300 do. Off control signal CTL4 indicating the OFF state is provided to the control terminal of the heating device 200, the heating device 200 is turned off and stops generating heat.

1 and 2, in order to control the heating device 200, an additional circuit is added in addition to the temperature control unit 110 to protect the toner fixing device 300. [

This protection circuit can reduce the serious damage of the toner fixing apparatus 300 by heat as described above. However, when the laser printer is used in a low temperature environment, there is a limit to reduce damage due to overheating of the heating device 200 of the toner fixing device 300 even when the temperature control device 100 is normal. Over-heating refers to a phenomenon in which the temperature of the toner fixing apparatus 300 continuously increases in proportion to the previous ON time even if the heating apparatus 200 is turned off at the reference temperature.

In addition, since the temperature control unit 110 can be implemented by a central processing unit that drives software, an error may occur in the temperature control unit 110 due to malfunction of the software. The heating device 200 may be turned on regardless of the temperature of the fixing device 300 to damage the fixing device 300 when the temperature control part 110 and the thermistor Rt fail simultaneously, Fire may occur.

Therefore, a method for further improving the temperature control device 100 can be considered.

To describe an improved temperature control device, a high pass filter will be described with reference to FIGS. 3 to 7. FIG.

FIG. 3 is a circuit diagram of a pull-down high-pass filter according to an embodiment of the present invention, and FIG. 4 is a graph showing a pulse signal response of a pull-down high-pass filter according to an embodiment of the present invention.

As shown in FIG. 3, the pull-down high-pass filter according to the embodiment of the present invention includes a capacitor Ca and a resistor Ra.

A pulse signal Va_i as shown in FIG. 4 is applied to one end of the capacitor Ca. The other end of the capacitor Ca is connected to one end of the resistor Ra. The other end of the resistor Ra is connected to the ground.

The other end of the capacitor Ca outputs a response signal Va_o to the pulse signal. The waveform of the response signal Va_o to the pulse signal of the pull-down high-pass filter of FIG. 3 is shown in FIG.

FIG. 5 is a circuit diagram of a pull-up high-pass filter according to an embodiment of the present invention, and FIG. 6 is a graph showing a pulse signal response of a pull-up high-pass filter according to an embodiment of the present invention.

As shown in FIG. 5, the pull-up high-pass filter 160 according to the embodiment of the present invention includes a capacitor C2 and a resistor R5.

A pulse signal Vb_i shown in FIG. 6 is applied to one end of the capacitor C2. The other end of the capacitor C2 is connected to one end of the resistor R5. The other end of the resistor R5 is connected to the DC power supply VCC.

The other end of the capacitor C2 outputs a response signal Vb_o to the pulse signal.

Since the other end of the resistor R5 is connected to the DC power supply VCC, the waveform of the response signal Vb_o to the pulse signal of the pull-up high-pass filter 160 of FIG. 5 is the same as that of FIG.

FIG. 7 is a circuit diagram of a pull-up high-pass filter having a discharge unit according to an embodiment of the present invention, and FIG. 8 is a graph showing a pulse signal response of a pull-up high-pass filter having a discharge unit according to an embodiment of the present invention.

As shown in FIG. 7, the pull-up high-pass filter 160 according to the embodiment of the present invention includes a capacitor C2 and a resistor R5. The discharger 170 according to the embodiment of the present invention includes a diode D1 and a resistor R4.

A pulse signal Vc_i as shown in Fig. 8 is applied to one end of the capacitor C2. The other end of the capacitor C2 is connected to one end of the resistor R5. The other end of the resistor R5 is connected to the DC power supply VCC.

The anode of the diode D1 is connected to the other end of the capacitor C2 and the cathode of the diode D1 is connected to one end of the resistor R4. The other end of the resistor R4 is connected to the DC power supply VCC.

The other end of the capacitor C2 outputs a response signal Vc_o to the pulse signal Vc_i.

Since the other end of the resistor R5 is connected to the DC power source VCC, the waveform of the response signal Vc_o to the pulse signal Vc_i of the pull-up high-pass filter 160 in FIG. 7 should be similar to FIG. The waveform of the response signal Vc_o to the pulse signal Vc_i due to the discharge unit 170 is modified.

That is, the discharging unit 170 discharges a voltage greater than the DC power supply VCC in the response signal Vc_o for the pulse signal Vc_i. When the pulse signal Vc_i is logic low, the magnitude of the voltage of the response signal Vc_o is smaller than the voltage of the DC power source VCC, so that the diode D1 causes the discharging unit 170 to pull up the pull- ). When the pulse signal Vc_i is at logic high or when the voltage of the pulse signal Vc_i has the voltage value of the DC power source VCC, the magnitude of the voltage of the response signal Vc_o is larger than the voltage of the DC power source VCC The magnitude of the voltage of the response signal Vc_o which is the output of the pull-up high-pass filter 160 due to the diode D1 is maintained at the voltage value of the DC power source VCC. In this specification, the bias voltage of the diode D1 is perceived to be obvious to a person skilled in the art and is not mentioned separately. However, the waveform change in the case where this bias voltage is considered can be derived by those skilled in the art on the basis of the present specification and can be considered to be in the range of the equivalence of the present invention.

Next, an improved temperature control apparatus for a heating apparatus of a fixing apparatus according to an embodiment of the present invention will be described with reference to FIGS. 9 to 11. FIG.

9 is a circuit diagram of a temperature control apparatus for a heating apparatus of a fixing apparatus according to another embodiment of the present invention.

9, the temperature control apparatus 100 of the heating apparatus of the fixing apparatus according to an embodiment of the present invention is connected to the control terminal of the heating apparatus 200 of the fixing apparatus and includes a temperature control unit 110, A comparator 130 and a control signal generator 150, a pull-up high-pass filter 160 and a discharger 170. [

The temperature control unit 110 generates an enable signal CTL1 of the heating device 200. [ The specific operation of the temperature control unit 110 will be described later.

The temperature sensor 120 includes a thermistor Rt, a capacitor C1, and a resistor R1.

A thermistor (Rt) is an electrical device that uses a property that the resistance of a material changes with temperature. In an embodiment of the present invention, an NTC thermistor (Negative Temperature Coefficient Thermistor) whose resistance value decreases with temperature by a thermistor Rt is used, but need not be limited thereto. That is, in another embodiment, a positive temperature coefficient thermistor (PTC thermistor) whose resistance value increases with temperature may be used as the thermistor Rt, and when the positive temperature coefficient thermistor is used Changes in the circuit diagram may be derived by those skilled in the art on the basis of this disclosure and may be considered to be within the scope of the invention.

One end of the thermistor Rt is connected to the DC power supply VCC. One end of the resistor R1 is connected to the other end of the thermistor Rt, and the other end of the resistor R1 is connected to the ground. One end of the capacitor C1 is connected to one end of the resistor R1 and the other end of the capacitor C1 is connected to the other end of the resistor R1.

The DC voltage VCC is divided by the resistor Rt and the resistor R 1 connected in series and the divided DC voltage becomes the measurement signal CTL 2 corresponding to the measurement temperature of the toner fixing apparatus 300. The other end of the service robot Rt outputs a measurement signal CTL2 corresponding to the measurement temperature of the toner fixing apparatus 300. [

The comparator 130 includes a reference voltage generator 131 and an amplifier U1.

The reference voltage generator 131 generates the reference voltage Vref corresponding to the reference temperature. In the embodiment of FIG. 1, the reference voltage generator 131 includes a resistor R2 and a resistor R3.

One end of the resistor R2 is connected to a DC power source. One end of the resistor R3 is connected to the other end of the resistor R2, and the other end of the resistor R3 is connected to the ground. The DC power source is divided by the resistor R2 and the resistor R3 connected in series, and the divided DC voltage becomes the reference voltage Vref corresponding to the reference temperature.

The amplifier U1 can generate the determination signal CTL3 by comparing the voltage of the measurement signal CTL2 with the reference voltage Vref. The positive input terminal of the amplifier U1 is connected to the other end of the resistor R2 and the negative input terminal of the amplifier U1 is connected to the other end of the thermistor Rt.

If the reference voltage Vref corresponding to the reference temperature is higher than the voltage of the measurement signal CTL2 corresponding to the measurement temperature, the output terminal of the amplifier U1 outputs the determination signal CTL3 corresponding to the logic high. When the reference voltage Vref corresponding to the reference temperature is lower than the voltage of the measurement signal CTL2 corresponding to the measurement temperature, the output terminal of the amplifier U1 outputs the determination signal CTL3 corresponding to the logic low.

As shown in FIG. 9, the pull-up high-pass filter 160 according to the embodiment of the present invention includes a capacitor C2 and a resistor R5. The discharger 170 according to the embodiment of the present invention includes a diode D1 and a resistor R4.

A heating device enable signal CTL1 is applied to one end of the capacitor C2. The other end of the capacitor C2 is connected to one end of the resistor R5. The other end of the resistor R5 is connected to the DC power supply VCC.

The anode of the diode D1 is connected to the other end of the capacitor C2 and the cathode of the diode D1 is connected to one end of the resistor R4. The other end of the resistor R4 is connected to the DC power supply VCC.

The pull-up high-pass filter 160 performs pull-up high-pass filtering on the enable signal CTL1.

The discharging unit 170 discharges a voltage higher than the DC power supply VCC in the pull-up high-pass filtered enable signal to generate the control signal CTL5. The other end of the capacitor C2 outputs a control signal CTL5 which is a pull-up high-pass filtered enable signal from which a voltage higher than the voltage of the DC power supply VCC is removed.

The control signal generator 150 controls the heating device 200 based on the determination signal CTL3 and the comparison signal CTL6. The specific operation of the control signal generator 150 will be described later.

The control signal generator 150 includes a NAND gate U3 and a buffer U4.

Both input terminals of the NAND gate U3 are connected to the output terminal of the amplifier U1 and the output terminal of the amplifier U5, respectively. The NAND gate U3 performs a NAND operation with the determination signal CTL3 and the comparison signal CTL6 to output the heating device on / off control signal CTL4. The input terminal of the buffer U4 is connected to the output terminal of the NAND gate U3 and the output terminal of the buffer U4 is connected to the control terminal of the heating device 200. [ The buffer U4 buffers the heating device on / off control signal CTL4 and provides the buffered heating device on / off control signal CTL4 to the control terminal of the heating device 200. [

The operation of the improved temperature control apparatus of the heating apparatus of the fixing apparatus according to an embodiment of the present invention will be described with reference to FIG.

10 is a flowchart showing the operation of the advanced temperature control apparatus of the heating apparatus of the fixing apparatus according to the embodiment of the present invention.

The temperature control unit 110 generates the enable signal CTL1 of the heating device 200 based on the measurement signal CTL2 and the comparison signal CTL6 (S201). 8 and 9, the logic low enable signal CTL1 indicates the enable of the heating device 200 and the logic high enable signal CTL1 indicates the disable of the heating device 200 . When the enable signal CTL1 indicates the disable of the heating device 200, the heating device 200 is turned off.

The temperature sensor 120 measures the temperature of the toner fixing apparatus 300 (S203). The temperature sensor 120 can generate the measurement signal CTL2 corresponding to the temperature of the toner fixing apparatus 300. [

The comparing unit 130 compares the measured temperature with the reference temperature, and determines whether the measured temperature is higher than the reference temperature (S205). The comparator 130 compares the voltage of the measurement signal CTL2 corresponding to the measured temperature with a reference voltage Vref corresponding to the reference temperature to generate a determination signal CTL3 indicating whether the measured temperature is higher than the reference temperature can do. The reference voltage generator 131 generates the reference voltage Vref corresponding to the reference temperature and the amplifier U1 compares the voltage of the measurement signal CTL2 with the reference voltage Vref to generate the determination signal CTL3 can do.

The pull-up high-pass filter 160 performs pull-up high-pass filtering on the enable signal CTL1 (S207).

The discharging unit 170 discharges a voltage higher than the DC power supply VCC in the pull-up high-pass filtered enable signal to generate the control signal CTL5 (S209).

The comparator 180 compares the control signal CTL5 with the reference voltage Vref to generate a comparison signal CTL6 (S211). The comparison signal CTL6 may indicate that the heating device 200 is turned on or the heating device 200 is turned off. The comparator signal CTL6 of the logic high in the embodiment of the present invention indicates the ON state of the heating device 200 and in the embodiment of the present invention the logic low compare signal CTL6 indicates the off state of the heating device 200 have.

The control signal generator 150 controls the heating device 200 based on a comparison between the measured temperature and the reference temperature (S213). The control signal generator 150 may determine whether the measured temperature is higher than the reference temperature. If the measured temperature is higher than the reference temperature, the control signal generator 150 can turn off the heating device 200. [ If the measured temperature is lower than the reference temperature, the control signal generator 150 can turn on the heating device 200. [ The control signal generating unit 150 generates the heating device on-off control signal CTL4 based on the comparison signal CTL6 and the determination signal CTL3 of the heating device 200 and generates the heating device on- CTL4 may be provided to the control terminal of the heating device 200. [

If the determination signal CTL3 is logic low in the embodiment of the present invention, the control signal generator 150 determines that the heating device 200 is off Off control signal CTL4 which is a control signal for controlling the heating operation. When the comparison signal CTL6 indicates that the heating device 200 is turned on, the control signal generation unit 150 turns on the heating device 200 Off control signal CTL4 that instructs the heating device to turn on. When the comparison signal CTL6 indicates that the heating apparatus 200 is off, the control signal generation unit 150 instructs the heating apparatus 200 to turn off the heating apparatus 200 Off control signal CTL4 which is a control signal for controlling the heating operation.

When the comparison signal CTL4 indicating the ON state of the heating apparatus 200 is provided to the control terminal of the heating apparatus 200, the heating apparatus 200 is turned on and generates heat, . When the heating device on / off control signal CTL4 indicating the turning off of the heating device 200 is provided to the control terminal of the heating device 200, the heating device 200 is turned off and stops generating heat.

11 is a graph showing a waveform of a signal in the temperature control device according to another embodiment of the present invention.

When the enable signal CTL1 is changed from a logic high to a logic low, the comparison signal CTL6 is enabled by the pull-up high-pass filter 160, the discharging unit 170 and the comparing unit 180, It changes from a logic high to a logic low and then changes to a logic low after maintaining a logic high for a predetermined time. When the temperature of the fixing device 300 is lower than the reference temperature and the enable signal CTL1 changes from a logic high to a logic low, the heating device 200 causes the enable signal CTL1 to change from a logic high to a logic low After turning on, it is turned off for a predetermined time and then turned off.

When the comparison signal CTL6 changes from logic high to logic low, the temperature control unit 110 changes the value of the enable signal CTL1 to logic high and again needs to examine whether to turn on the heating device 200 . Therefore, when the comparison signal CTL6 changes from logic high to logic low, the temperature control unit 110 determines whether the temperature of the fixing device 300 is higher than the reference temperature from the measurement signal CTL2. When the measured temperature corresponding to the measurement signal CTL2 is lower than the reference temperature when the comparison signal CTL6 changes from a logic high to a logic low, the temperature control unit 110 instructs the heating device 200 to be enabled The heating device enable signal CTL1 can be generated. If the measured temperature corresponding to the measured signal CTL2 is higher than the reference temperature when the comparison signal CTL6 changes from a logic high to a logic low, the temperature control unit 110 controls the heating The device enable signal CTL1 can be generated.

9 to 11, in the case where an error occurs in the circuit including the thermistor for measuring the temperature, the temperature control unit 110 implemented as software for controlling the heating device of the toner fixing apparatus has an error The comparison signal CTL6 is maintained at a logic low level after a lapse of a predetermined time unless there is a change in the heating device enable signal CTL1 due to the pull-up high-pass filter 160, the discharging unit 170 and the comparing unit 180. [ . Therefore, after the lapse of a predetermined time, the heating apparatus 200 is turned off to prevent the toner fixing apparatus 300 from being damaged, and further, the fire can be prevented.

According to an embodiment of the present invention, the above-described method can be implemented as a code readable by a processor on a medium on which a program is recorded. Examples of the medium that can be read by the processor include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, etc., and may be implemented in the form of a carrier wave (e.g., transmission over the Internet) .

The mobile terminal described above can be applied to not only the configuration and method of the embodiments described above but also all or some of the embodiments may be selectively combined so that various modifications may be made to the embodiments It is possible.

Claims (11)

Generating an enable signal of the heating device of the toner fixing device;
Measuring a temperature of the toner fixing apparatus;
Determining whether the measured temperature is higher than a reference temperature, and generating a determination signal;
Performing a pull-up high pass filtering on the enable signal to generate a first control signal;
Comparing the first control signal with a reference voltage to generate a comparison signal; And
And controlling the heating device based on the determination signal and the comparison signal
A method of controlling a heating device of a toner fixing device. The method according to claim 1,
Wherein the enable signal is generated based on the comparison signal
A method of controlling a heating device of a toner fixing device. 3. The method of claim 2,
Wherein the enable signal is generated based further on the measured temperature
A method of controlling a heating device of a toner fixing device. The method of claim 3,
The step of generating the enable signal
And generating an enable signal indicating enabling of the heating device when the measured temperature is lower than the reference temperature when the first control signal is greater than the reference voltage
A method of controlling a heating device of a toner fixing device. 5. The method of claim 4,
The step of generating the enable signal
Generating a disable signal indicating enabling of the heating device when the measured temperature is greater than the reference temperature when the first control signal is greater than the reference voltage
A method of controlling a heating device of a toner fixing device. The method according to claim 1,
The step of generating the first control signal
Up-high-pass filtering the enable signal,
And discharging a voltage greater than the voltage of the DC power supply in the pull-up high-pass filtered enable signal to generate the first control signal
A method of controlling a heating device of a toner fixing device. The method according to claim 1,
The step of controlling the heating device
Turning on the heating device if the measured temperature is lower than the reference temperature and the first control signal is less than the reference voltage
A method of controlling a heating device of a toner fixing device. 8. The method of claim 7,
The step of controlling the heating device
Turning off the heating device if the measured temperature is higher than the reference temperature;
And turning off the heating device if the measured temperature is lower than the reference temperature and the first control signal is greater than the reference voltage
A method of controlling a heating device of a toner fixing device. A temperature control unit for generating an enable signal of the heating device of the toner fixing apparatus;
A temperature sensor for measuring the temperature of the toner fixing device;
A first comparing unit for determining whether the measured temperature is higher than a reference temperature and generating a determination signal;
A pull-up high-pass filter for pull-up high-pass filtering the enable signal to generate a first control signal;
A second comparator for comparing the first control signal with a reference voltage to generate a comparison signal; And
And a control signal generator for controlling the heating device based on the determination signal and the comparison signal
A control device of a heating device of a toner fixing device. 10. The method of claim 9,
Wherein the temperature control unit generates the enable signal based on the comparison signal and the measured temperature
A control device of a heating device of a toner fixing device. 10. The method of claim 9,
Further comprising a discharger for removing a voltage greater than a voltage of the DC power source from the first control signal
A control device of a heating device of a toner fixing device.
KR1020130005179A 2013-01-17 2013-01-17 Laser printer, apparatus and method for protecting toner fuser of laser printer KR20140092990A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200071399A (en) 2018-12-11 2020-06-19 전자부품연구원 Heater control device and method for fuser module of laser printer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200071399A (en) 2018-12-11 2020-06-19 전자부품연구원 Heater control device and method for fuser module of laser printer

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