CN109240053A - Power control, method and image forming apparatus - Google Patents
Power control, method and image forming apparatus Download PDFInfo
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- CN109240053A CN109240053A CN201811364124.2A CN201811364124A CN109240053A CN 109240053 A CN109240053 A CN 109240053A CN 201811364124 A CN201811364124 A CN 201811364124A CN 109240053 A CN109240053 A CN 109240053A
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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
- G03G15/50—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
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- Control Or Security For Electrophotography (AREA)
Abstract
The present invention provides a kind of power control, method and image forming apparatus, power control includes that Sofe Switch control unit and DC turn DC unit, Sofe Switch control unit is used to control the print control unit power supply that DC turns DC unit to image forming apparatus, Sofe Switch control unit is also used to obtain the working state signal of image forming apparatus, according to working state signal, judge whether that heating is abnormal, realizes and indirect monitoring is carried out to the heating in image forming apparatus with Sofe Switch control unit；And when determining that heating is abnormal, control DC turns the power supply that DC unit disconnects print control unit, to cut off the control signal of image forming apparatus all components, reduce a possibility that causing heating tube to heat always because of program fleet, stuck or temperature-sensitive unit detection exception, the reliability of the power supply control in image forming apparatus is improved, and then improves the security performance of image forming apparatus.
Description
Technical field
The present invention relates to definition technique fields more particularly to a kind of power control, method and image to form dress
It sets.
Background technique
Image forming apparatus, it will be appreciated that for the device for capableing of print image on the recording medium, can for duplicator, beat
Print machine, facsimile machine or other execute the multifunction peripheral (Multi-Function of above functions in one single
Peripheral, MFP).Wherein, essentially identical in the implementation of recording medium print image.It is main by taking laser printer as an example
Step is realized comprising charging, photosensitive, development, transfer, fixing etc., wherein arrive in fix steps the imaging hot setting of transfer
On paper, fixing temperature can achieve 200 DEG C or so.This temperature have been over many articles can burning point, be easy cause
Fault or fire.Therefore, it is necessary to take reliable safeguard measure to the heating process in image forming apparatus.
Be usually to add temperature measurement circuit in existing image forming apparatus, for the heating location temperature to fixing component into
Row detection.When the heating temperature of fixing component reaches preset temperature value, print control unit receives what temperature measurement circuit was sent
Indication signal, then cut off the heating unit power supply in fixing component, and stopping continues to heat.
However, will lead to and add if the print control unit of printer occurs crashing or exception occurs in temperature measurement circuit
Hot cell (such as halogen lamp tube) continues to heat, and temperature continues to increase, and excessively high temperature may reach the burning point of adjacent material, long
The heating of time is easy to cause in the small space of printer that temperature is excessively high, it is easy to fire occur, and print control unit is still
So there is power supply, the components such as motor, the high pressure of printer may still work, and there is bigger security risk.As it can be seen that existing figure
As the power supply control mode reliability formed in device is not high.
Summary of the invention
The present invention provides a kind of power control, method and image forming apparatus, improves electric in image forming apparatus
The reliability of source control.
According to the first aspect of the invention, a kind of power control is provided, including Sofe Switch control unit and DC turn DC
Unit, the Sofe Switch control unit are used to control the print control unit confession that the DC turns DC unit to image forming apparatus
Electricity, the Sofe Switch control unit are also used to obtain the working state signal of image forming apparatus, are believed according to the working condition
Number, judge whether that heating is abnormal；And when determining that heating is abnormal, controls the DC and turn the DC unit disconnection print control unit
Power supply.
Optionally, in a kind of possible implementation of first aspect, the state output terminal of the Sofe Switch control unit
It is connect with the computer heating control output end of the print control unit；
The Sofe Switch control unit is used to receive the heating enable signal or heating exported from the print control unit
Pick-off signal, and when determining that the retention time of the heating enable signal is greater than or equal to preset first time threshold, really
Fixed heating is abnormal.
It optionally, further include state detection unit in the alternatively possible implementation of first aspect；
The state detection unit connection described image forms the temperature-sensitive unit or heating unit of device；
The state detection unit is used to carry out state-detection to the temperature-sensitive unit or the heating unit, obtains described
The working state signal of image forming apparatus, and the working state signal is transferred to the Sofe Switch control unit；Wherein,
The working state signal that described image forms device includes the output signal of the temperature-sensitive unit or the heating of the heating unit
Working signal.
Optionally, in another possible implementation of first aspect, the state detection unit include: comparator and
Reference voltage circuit；
The first input end of the comparator is connect with the output end of the temperature-sensitive unit, the second input of the comparator
End is connect with the output end of the reference voltage circuit, the output end of the comparator control terminal with the heating unit respectively
It is connected with the state output terminal of the Sofe Switch control unit；
Wherein, the comparator is used for:
When the voltage value of the first input end is less than or equal to the voltage value of second input terminal, the comparator
Output end output for controlling the pick-off signal of heating unit power-off.
Optionally, in another possible implementation of first aspect, the Sofe Switch control unit, for receiving
State the output signal of comparator；Determine that the output signal of the comparator sports the pick-off signal within a preset period of time
Number, if the number is greater than or equal to preset upper limit number, it is determined that heating is abnormal.
Optionally, in another possible implementation of first aspect, the state detection unit includes: voltage detecting
Unit, rectification unit and voltage isolator；
The voltage detection unit is in parallel with the heating part of the heating unit, and the output end of the voltage detection unit connects
The input terminal of the rectification unit is connect, the output end of the rectification unit connects the input terminal of the voltage isolator, the electricity
The output end of pressure isolator connects the state output terminal of the Sofe Switch control unit.
Optionally, in another possible implementation of first aspect, the Sofe Switch control unit, for receive from
The heating operation signal for the heating unit that the voltage isolator transmission comes；And in the heater according to the heating unit
Make signal, when determining that the heated hold time of the heating unit is greater than or equal to preset second time threshold, determines heating
It is abnormal.
The second aspect of the present invention provides a kind of image forming apparatus, comprising: print control unit, temperature-sensitive unit, heating
Power control described in unit and the various possible implementations of first aspect present invention and first aspect.
The third aspect of the present invention, provides a kind of power control method of image forming apparatus, and described image forms device
Turn DC unit, the Sofe Switch control including print control unit, temperature-sensitive unit, heating unit, Sofe Switch control unit and DC
Unit turns DC unit for controlling the DC and powers to the print control unit；The described method includes:
The Sofe Switch control unit obtains the working state signal that described image forms device, according to the working condition
Signal judges whether that heating is abnormal；And when determining that heating is abnormal, controls the DC and turn the DC unit disconnection print control list
The power supply of member；
Wherein, the working state signal includes: enable signal of the print control unit to the heating unit, institute
State the output signal of temperature-sensitive unit or the heating operation signal of the heating unit.
Optionally, in a kind of possible implementation of the third aspect, according to the working state signal, judge whether to add
Heat anomaly, comprising:
The Sofe Switch control unit, to the enable signal of the heating unit, determines institute according to the print control unit
The retention time of enable signal is stated, if the retention time of the enable signal is greater than or equal to preset first time threshold,
Determine that heating is abnormal；
Alternatively, state detection unit detects the output signal of the temperature-sensitive unit, the Sofe Switch control unit determines institute
Number of the output signal of state detection unit within a preset period of time from first kind sign mutation for the second class signal is stated, if institute
Number is stated more than or equal to preset upper limit number, it is determined that heating is abnormal, wherein the first kind signal is used to indicate described
The enable signal that heating unit is powered, the second class signal are used to indicate the pick-off signal of the heating unit power-off；
Alternatively, state detection unit detects the heating operation signal of the heating unit, the Sofe Switch control unit root
The heating operation signal that the heating unit is obtained according to the state detection unit, when determining that the heating of the heating unit is kept
Between, if the heated hold time is greater than or equal to preset second time threshold, it is determined that heating is abnormal.
In a kind of power control provided by the invention, method and image forming apparatus, power control includes soft
Switch control unit and DC turn DC unit, and Sofe Switch control unit turns printing of the DC unit to image forming apparatus for controlling DC
Control unit power supply, Sofe Switch control unit is also used to obtain the working state signal of image forming apparatus, according to working condition
Signal is judged whether that heating is abnormal, realizes and supervised indirectly with Sofe Switch control unit to the heating in image forming apparatus
Control；And when determining that heating is abnormal, control DC turns the power supply that DC unit disconnects print control unit, is formed to cut off image
The control signal of device all components is reduced because program fleet, stuck or temperature-sensitive unit detection exception lead to heating tube always
A possibility that heating, the reliability of the power supply control in image forming apparatus is improved, and then improves image forming apparatus
Security performance.
Detailed description of the invention
Fig. 1 is a kind of power control structure schematic diagram of image forming apparatus in the prior art；
Fig. 2 is a kind of power control structural schematic diagram of image forming apparatus provided in an embodiment of the present invention；
Fig. 3 is the power control structural schematic diagram of another image forming apparatus provided in an embodiment of the present invention；
Fig. 4 is that a kind of heating unit structure for image forming apparatus shown in Fig. 3 provided in an embodiment of the present invention is illustrated
Figure；
Fig. 5 is that a kind of temperature-sensitive cellular construction for image forming apparatus shown in Fig. 3 provided in an embodiment of the present invention is illustrated
Figure；
Fig. 6 is the power control structural schematic diagram of another image forming apparatus provided in an embodiment of the present invention；
Fig. 7 is the power control structural schematic diagram of another image forming apparatus provided in an embodiment of the present invention；
Fig. 8 is that a kind of heating unit structure for image forming apparatus shown in Fig. 7 provided in an embodiment of the present invention is illustrated
Figure；
Fig. 9 is that a kind of state detection unit for image forming apparatus shown in Fig. 7 provided in an embodiment of the present invention connects
The structural schematic diagram of temperature-sensitive unit；
Figure 10 is the power control structural schematic diagram of another image forming apparatus provided in an embodiment of the present invention；
Figure 11 is a kind of heating unit and state for image forming apparatus shown in Figure 10 provided in an embodiment of the present invention
The structural schematic diagram of detection unit；
Figure 12 is a kind of power control method flow diagram of image forming apparatus provided by the invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
It is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Description and claims of this specification and term " first ", " second ", " third " " in above-mentioned attached drawing
The (if present)s such as four " are to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should manage
The data that solution uses in this way are interchangeable under appropriate circumstances, so as to the embodiment of the present invention described herein can in addition to
Here the sequence other than those of diagram or description is implemented.
It should be appreciated that in various embodiments of the present invention, the size of the serial number of each process is not meant to execute sequence
It is successive, the execution of each process sequence should be determined by its function and internal logic, the implementation without coping with the embodiment of the present invention
Journey constitutes any restriction.
It should be appreciated that in the present invention, " comprising " and " having " and their any deformation, it is intended that covering is not arranged
His includes, for example, the process, method, system, product or equipment for containing a series of steps or units are not necessarily limited to clearly
Those of list step or unit, but may include be not clearly listed or for these process, methods, product or equipment
Intrinsic other step or units.
It should be appreciated that in the present invention, " multiple " refer to two or more."and/or" is only a kind of description pass
Join object incidence relation, indicate may exist three kinds of relationships, for example, and/or B, can indicate: individualism A is existed simultaneously
These three situations of A and B, individualism B.Character "/" typicallys represent the relationship that forward-backward correlation object is a kind of "or".It " include A, B
And C ", " include A, B, C " refer to that A, B, C three include, " including A, B or C " refers to comprising A, B, C thrin, " comprising A,
B and/or C " refers to comprising wantonly 1 in A, B, C three or 2 or 3 wantonly.
It should be appreciated that in the present invention, " B corresponding with A ", " B corresponding with A ", " A and B are corresponding " or " B and A
It is corresponding ", it indicates that B is associated with A, B can be determined according to A.It determines that B is not meant to determine B only according to A according to A, may be used also
To determine B according to A and/or other information.The matching of A and B is that the similarity of A and B is greater than or equal to preset threshold value.
Depending on context, as used in this " if " can be construed to " ... when " or " when ... " or
" in response to determination " or " in response to detection ".
Technical solution of the present invention is described in detail with specifically embodiment below.These specific implementations below
Example can be combined with each other, and the same or similar concept or process may be repeated no more in some embodiments.
It is a kind of power control structure schematic diagram of image forming apparatus in the prior art referring to Fig. 1.Figure in Fig. 1
It can be simply not understood as printer as forming device, alternating current is converted into the first DC voltage by the first power adapter 1
VCC_1.First DC voltage VCC_1 turns DC unit by one or more levels DC being arranged in second source converter 2, is converted into
Second DC voltage VCC_2, the second DC voltage VCC_2 access the print control unit SoC of printer as supply voltage.
First DC voltage VCC_1 also passes through voltage regulator circuit and is converted into third DC voltage VCC_3.Third DC voltage VCC_3 conduct
The supply voltage of Sofe Switch control unit.The button operation that Sofe Switch control unit responds user generates high level or low level is defeated
Out, the enable end EN of the output end connection second source converter 2 of Sofe Switch control unit.Specifically, the Sofe Switch control in Fig. 1
Unit processed for receiving operation of the user to printer control panel upper switch key, and generates control second source converter 2
The enable signal of work.For example, Sofe Switch control unit provides high level signal when switch key boots up when the user clicks
To the enable end EN of second source converter 2, then second source converter 2 is started to work, and is provided the second DC voltage VCC_2 and is arrived
Print control unit SoC makes printer realize booting；When switch key is shut down when the user clicks, Sofe Switch control unit is mentioned
For the enable end EN of low level signal to second source converter 2, second source converter 2 stops providing the second DC voltage
VCC_2 to print control unit SoC, printer realize shutdown.Print control unit SoC can be understood as system on chip, make
For the core cell of printer, the overall operation of printer is controlled.
In existing print control operation, if heating part temperature reaches preparatory in the heating unit of image forming apparatus
When the critical-temperature T0 of setting (T0 is usually less than 200 DEG C), it is anti-that the temperature value that temperature-sensitive unit will test is converted into voltage signal
Feed print control unit SoC, and print control unit SoC issues the control signal of shutdown heating unit, cuts off heating unit
Power supply.The heating part of heating unit can be halogen lamp tube, or other types heating element.Wherein, print control list
The control signal of first SoC executes output according to internal processes.However, program is in implementation procedure it is possible that uncontrollable exception
Interference causes the failure (bug) of program fleet or program itself, causes the execution of program to cause confusion, or even run into and extremely follow
Ring, alternatively, temperature-sensitive unit may also occur, detection is abnormal, and causing printer to have been at stuck state can not exit.Feel at this time
After the voltage signal of warm unit output feeds back to print control unit SoC, it is single that print control unit SoC can not issue shutdown heating
The control signal of member, makes temperature continue to rise.If in print job, nobody monitors printer on side, it is difficult to discovery printing in time
Captain is in heated condition the time, and with the rising of temperature may result in the component around fixing area reach can burning point, draw
Play safety accident.
Hidden danger in order to reduce safety accidents, the present invention provides a kind of power controls, even if in print control unit
It, also can be soft meeting by the safeguard protection mode in following various embodiments in the case that exception occur in SoC and temperature-sensitive unit
When the exception-triggered condition of switch control unit, the power supply of print control unit SoC is cut off, entire print control unit is made
SoC power-off, it is ensured that fixing temperature does not exceed safety limit.Below by by each embodiment combination schematic diagram to of the invention
Power control is illustrated and illustrates.
It referring to fig. 2, is a kind of power control structural schematic diagram of image forming apparatus provided in an embodiment of the present invention.
Image forming apparatus as shown in Figure 2 mainly include power control, print control unit, heating unit, temperature-sensitive unit with
And other assemblies.Wherein, print control unit stops heating for controlling electric heating or power-off on heating unit, and temperature-sensitive unit is used
The temperature of heating part in induction heating unit, and generate and indicate that the signal of the temperature is transferred to print control unit, to beat
It prints control unit controller power-off in the temperature anomaly for judging heating unit and stops heating.Print control unit is also used to control
The work of other assemblies, other assemblies are, for example, media drive component, toner cartridge runner assembly and scan components, motor etc..Herein
On the basis of, it mainly includes that Sofe Switch control unit and DC turn DC that the embodiment of the present invention provides a kind of power control in Fig. 2
Unit.Sofe Switch control unit is used to control the print control unit power supply that DC turns DC unit to image forming apparatus.Wherein, soft
Switch control unit is also used to obtain the working state signal of image forming apparatus, and according to the working state signal, judgement is
No heating is abnormal, realizes and carries out indirect monitoring to the heating in image forming apparatus with Sofe Switch control unit.Wherein, as schemed
Shown in 2, Sofe Switch control unit obtain the working state signal, it can be understood as be from heating unit, temperature-sensitive unit or
What person's print control unit obtained.When determining that heating is abnormal, control DC turns DC unit and disconnects printing control Sofe Switch control unit
The power supply of unit processed, to cut off the control signal of image forming apparatus all components, reduce because program fleet, it is stuck or
A possibility that detection of temperature-sensitive unit is abnormal to cause heating tube to heat always, improve the power supply control in image forming apparatus can
By property, and then improve the security performance of image forming apparatus.
In order to clearly obtain the working state signal of image forming apparatus to Sofe Switch control unit, and according to work
Judge whether that the abnormal realization process of heating is illustrated as status signal, is carried out below with reference to Fig. 3 to 11 and specific embodiment
Citing.
It is the power control structural representation of another image forming apparatus provided in an embodiment of the present invention referring to Fig. 3
Figure.In the embodiment shown in fig. 3, by detecting the output signal of print control unit, to determine whether heating is abnormal, thus
Realize the power supply control of image forming apparatus.Referring to Fig. 3, the state output terminal of Sofe Switch control unit directly with print control list
The computer heating control output end connection of member.The computer heating control output end of print control unit is also connected with the control terminal of heating unit,
While for exporting control signal to heating unit, also give the output of Sofe Switch control unit same control signal.Sofe Switch
The state output terminal of control unit receives control signal, and judges whether it is that heating is abnormal according to the control signal, in determination
Control DC turns the power supply that DC unit disconnects print control unit when heating is abnormal.
It is to be understood that Sofe Switch control unit is used to receive the heating enable signal exported from print control unit or adds
Hot pick-off signal, and when determining that the retention time of heating enable signal is greater than or equal to preset first time threshold, it determines
Heating is abnormal.Specifically, heating unit is controlled during print job, when print control unit receives print command to start to add
Heat, fixing temperature rise.When the signal designation Current Temperatures received from temperature-sensitive unit reach program setting critical value (such as
T0), print control unit exports heating pick-off signal to heating unit, turns off the power supply of heating unit, stops continuous heating.?
In the case that print control unit is out of control or temperature-sensitive unit exception, print control unit, which issues heating to heating unit always, to be made
Energy signal, such as provide the control signal of high level.Sofe Switch control unit shown in Fig. 3 receives print control unit and continues
The heating enable signal of output, and calculate the retention time of the heating enable signal.Sofe Switch control unit makes in determining heating
When the retention time of energy signal is greater than or equal to preset first time threshold, it can determine that heating is abnormal, Sofe Switch control list
First forbidden energy DC turns DC unit.Such as Sofe Switch control unit detects when being kept for the time of high level reach t2, stops turning to DC
The enable end of DC unit, which issues enable signal or turns DC unit enable end to DC, issues low level signal, turns off print control list
In order to avoid causing excessive temperature safety accident occurs for the power supply of member.The present embodiment passes through the power supply of cutting print control unit,
Stop the work that can also stop other assemblies while heating, prevents the components such as motor under high temperature from working on and being damaged.
With continued reference to Fig. 3, the structure of heating unit can there are many, shown in Fig. 3 is a kind of optional heating unit
Topology example.In heating unit structure shown in Fig. 3, heating unit mainly includes first switch, second switch and heating
Portion.First switch shown in Fig. 3 can be NPN type triode, the output end connection of base stage and print control unit, emitter
Ground connection.Second switch can be one or two, and a second switch can be used for controlling firewire, and two second switches can be with
For being controlled respectively zero curve and firewire.Second switch can be the switch control devices such as relay, silicon-controlled, metal-oxide-semiconductor.This reality
Example is applied to be illustrated by relay of second switch.The collector of one end connecting triode of the coil of relay, relay
The other end of the coil of device connects the output end of the first power adapter 1, that is, accesses the first DC voltage VCC_1.Heating part with
The contact portion of relay is connected between firewire and zero curve, in contact portion closure, electric heating on heating part；It is disconnected in contact portion
When, heating part power-off is not heated.In heating unit shown in Fig. 3, control terminal of the base stage of triode as heating unit is beaten
Control unit is printed by sending control signal to the base stage, triode ON or cut-off is controlled, to control contact in relay
The closing or opening in portion, and then realize the control for powering on or powering off to heating part.Sofe Switch control unit passes through detection printing control
Unit processed issues the control signal of the base stage, judges whether that heating is abnormal.It is to be understood that if print control unit is issued always
The control signal of the base stage high level makes electric heating on heating part, and the retention time of high level is greater than or equal to preset the
One time threshold, it is believed that the heating temperature of heating part has reached or approached preset critical-temperature, and determination is to add
Heat anomaly needs to stop heating part and continues to heat.First time threshold can be according to the heating coefficient of heating part and preset
Critical-temperature is come what is determined, i.e., when the continuous heating time reaching first time threshold, heating part can to the heating in fixing area
So that fixing area's temperature reaches either close to preset critical-temperature.
It referring to fig. 4, is a kind of heating unit structure for image forming apparatus shown in Fig. 3 provided in an embodiment of the present invention
Schematic diagram.The circuit diagram of heating unit, comprising second switch K21, diode D21, resistance R8, resistance R11, heating part HEAT2,
The related devices such as first switch Q21.Wherein second switch K21 is relay, for controlling the on-off of heating part HAET2, two poles
Pipe D21 is the freewheeling diode of relay coil, and first switch Q21 is NPN triode, for controlling the logical of relay coil
Disconnected, resistance R8, resistance R11 are divider resistance, and resistance value ratio ensures that first switch Q21 can saturation conduction.First switch Q21,
Two switch K21, diode D21, resistance R11 constitute the driving assembly of heating unit, provide and are driven by electricity heating part HAET2 work
Make.With continued reference to Fig. 4, controls signal and issued from print control unit, when controlling signal is high level, through resistance R8, resistance
After R11 partial pressure, the coil of first switch Q21 saturation conduction, second switch K21 is powered, second switch K21 switch conduction, heating
Portion's heating；When controlling signal is low level, first switch Q21 cut-off, second switch K21 shutdown, heating part is not heated.Simultaneously
Control signal is connected to the state output terminal of Sofe Switch control unit by current-limiting resistance R6.Wherein, current-limiting resistance R6 is optional
Element, can also be not provided with.
It is a kind of temperature-sensitive cellular construction for image forming apparatus shown in Fig. 3 provided in an embodiment of the present invention referring to Fig. 5
Schematic diagram.Temperature-sensitive unit in Fig. 5 is by the divider resistance Rt21 and negative temperature that are connected between the second DC voltage VCC_2 and ground
Coefficient resistance Rt2 is constituted, and the connection terminal potential between divider resistance Rt21 and negative tempperature coefficient thermistor Rt2 is temperature-sensitive
The voltage URt2 of the output signal of unit, andWherein, negative temperature coefficient thermistor power
The resistance value of resistance Rt2 is reduced with the raising of fixing temperature.In Fig. 5, R25 is current-limiting resistance, and C9 is filter capacitor, Ke Yigen
It selects or cancels according to actual needs.
It is the power control structural representation of another image forming apparatus provided in an embodiment of the present invention referring to Fig. 6
Figure.Power control as shown in FIG. 6 further comprises state detection unit.State detection unit can connect image and form dress
The temperature-sensitive unit or heating unit (being indicated referring to the dotted line in Fig. 6) set.State detection unit is used for temperature-sensitive unit or adds
Hot cell carries out state-detection, obtains the working state signal of image forming apparatus, and working state signal is transferred to soft open
Close control unit.Wherein, the working state signal of image forming apparatus includes the output signal or heating unit of temperature-sensitive unit
Heating operation signal.Embodiment shown in fig. 6, by state detection unit to temperature-sensitive unit or heating unit working condition
Detection, the judgement that auxiliary Sofe Switch control unit is heated extremely.Concrete implementation structure will be done by the following examples
It further illustrates.
It is the power control structural representation of another image forming apparatus provided in an embodiment of the present invention referring to Fig. 7
Figure.In order to be further illustrated to power control shown in fig. 6, state is examined below with reference to Fig. 7 and specific embodiment
It surveys unit and detects the output signal of temperature-sensitive unit, and the alternative construction for being transmitted to Sofe Switch control unit is illustrated.
In power control shown in Fig. 7, state detection unit includes: comparator and reference voltage circuit.The first of comparator is defeated
Enter end to connect with the output end of temperature-sensitive unit, the second input terminal of comparator and the output end of reference voltage circuit connect, and compare
The output end of device is connected with the state output terminal of the control terminal of heating unit and Sofe Switch control unit respectively.Wherein, comparator
For: when the voltage value of first input end is less than or equal to the voltage value of the second input terminal, the output end of comparator, which exports, to be used
In the pick-off signal of control heating unit power-off.Reference voltage circuit is used to provide stable voltage input for comparator, as
Reference voltage.In power control shown in Fig. 7, Sofe Switch control unit receives the output signal of comparator, then really
The output signal for determining comparator sports the number of pick-off signal within a preset period of time, if number is greater than or equal on preset
Limit number, it is determined that heating is abnormal.
During specific implementation, when print control unit receives print command, control fixation unit is started to work, heating
Unit conducting heating, fixing temperature rise.If fixing temperature reaches preset threshold temperature T0 (less than 200 DEG C), temperature-sensitive unit
The temperature value that will test is converted into output signal voltage URt2, feeds back to print control unit.Assuming that print control unit is different
Often, print control unit can not issue the signal of shutdown heating unit in time, continue to after causing fixing temperature to reach T0
It rises.Since the temperature sensing part Rt2 in temperature-sensitive unit is negative temperature coefficient temperature sensing part, when fixing temperature rises, output signal electricity
Press the decline of URt2 voltage.The first input end of comparator U1 accesses output signal voltage URt2, and the access of the second input terminal is with reference to electricity
URt12 is pressed, when temperature reaches preset control temperature T1 (T1 > T0), the voltage value of output signal voltage URt2 is less than second
The output voltage of the voltage value of the reference voltage URt12 of input terminal, comparator U1 becomes low level from high configuration.It is understood that
For the working state signal for accessing the state output terminal of Sofe Switch control unit becomes low level, Sofe Switch control from high level
Unit detects a failing edge, meanwhile, the output voltage of comparator U1 is forced to have dragged down the voltage of the control terminal of heating unit,
Heating unit power-off is set to stop heating, fixing temperature decline.However, due to the exception of print control unit, print control unit
Add to the control signal that heating unit is exported for controlling the high level that it is heated when fixing temperature drops to T1 or less always
Hot cell upper electric heating again.Fixing temperature continues to rise again, rises when reaching T1 again, the output voltage of comparator U1 again from
High level becomes low level, and Sofe Switch control unit detects a failing edge again.When Sofe Switch control unit is when default
Between when being consecutively detected n failing edge in section (n is preset upper limit number), Sofe Switch control unit forbidden energy DC turns DC unit,
Power off print control unit.Thus, it is possible to ensure printer will not hot soak condition (such as temperature is higher than T0 for a long time),
And safety accident is generated, while cutting off the power supply of print control unit, it is also prevented from the other assemblies such as motor under high temperature and works on
And cause other security risks.
It is a kind of heating unit structure for image forming apparatus shown in Fig. 7 provided in an embodiment of the present invention referring to Fig. 8
Schematic diagram.Heating unit may include second switch K11, diode D11, resistance R4, resistance R5, heating part HEAT1, first open
Close the related devices such as Q11.Wherein second switch K11 is relay, and for controlling the on-off of heating part HAET1, diode D11 is
The freewheeling diode of relay coil, first switch Q11 is NPN triode, for controlling the on-off of relay coil, resistance
R4, resistance R5 are divider resistance, and resistance value ratio ensures that first switch Q11 can saturation conduction.Signal is controlled from print control unit
It issues, when controlling signal is high level, after resistance R4, resistance R5 partial pressure, first switch Q11 saturation conduction, second switch
The coil of K11 is powered, second switch K11 conducting, heating part HAET1 heating；When controlling signal is low level, first switch
Q11 cut-off, second switch K11 shutdown, heating part HAET1 are not heated.Believed by the output of resistance R3 connection comparator output terminal
Number, while controlling the conducting and cut-off of first switch Q11.
It is a kind of state detection unit for image forming apparatus shown in Fig. 7 provided in an embodiment of the present invention referring to Fig. 9
Connect the structural schematic diagram of temperature-sensitive unit.In state detection unit shown in Fig. 9, U1A is comparator, resistance Rt11, resistance
Rt12 is divider resistance.The temperature sensing part Rt2 of temperature-sensitive unit is used to for the temperature signal of variation being changed into the resistance value of variation, passes through
The effect of divider resistance Rt21 and Rt2 are converted into the voltage of variation.Resistance R18, resistance R1 are current-limiting resistance, capacitor C3, capacitor
C4 is filter capacitor, can type selecting or cancellation according to actual needs.When U12- (indicating the 2nd pin voltage of U1A) < U13+ (table
Show the 3rd pin voltage of U1A) when, the output end of comparator U1A is the output of high configuration, and resistance R2 is pull-up resistor, is transferred to soft open
The working state signal for closing control unit is high level.When U12- (indicating the 2nd pin voltage of U1A) >=U13+ (indicates U1A the 3rd
Pin voltage), the output end of comparator U1A is low level output, and the working state signal for being transferred to Sofe Switch control unit becomes
For low level.WhereinAnd?
When not heating, the resistance of temperature sensing part Rt2 be configured as it is sufficiently large so that the output signal voltage U of temperature-sensitive unitRt2Voltage
It is worth close to VCC_2, i.e. U13+ > U12-, the output of comparator is high configuration；When temperature rises, temperature sensing part URt2Resistance value
Become smaller, the output signal voltage U of temperature-sensitive unitRt2On pressure drop voltage gradually become smaller, temperature rises to certain value T1, so that U13
When +≤U12-, the output of comparator is changed into low level output by high configuration, and the state output terminal to Sofe Switch control unit is defeated
The working state signal entered is changed into low level by high level.
It is the power control structural representation of another image forming apparatus provided in an embodiment of the present invention referring to Figure 10
Figure.In order to be further illustrated to power control shown in fig. 6, state is examined below with reference to Figure 10 and specific embodiment
It surveys unit and detects the heating operation signal of heating unit, and the alternative construction for being transmitted to Sofe Switch control unit is said
It is bright.
In the embodiment shown in fig. 10, state detection unit specifically includes that voltage detection unit, rectification unit and voltage
Isolator.Voltage detection unit is in parallel with the heating part of heating unit, the output end connection rectification unit of voltage detection unit
Input terminal, the input terminal of the output end connection voltage isolator of rectification unit, the output end of voltage isolator connect Sofe Switch control
The state output terminal of unit processed.Voltage detection unit detect heating part whether heating work, such as heating part is in heated condition
Under heating operation signal be high level, heating part be in the heating operation signal under non-heated condition as low level.Voltage inspection
Unit to be surveyed to export heating operation signal, heating operation signal enters voltage isolator after the rectification of rectification unit processing,
And the state output terminal of Sofe Switch control unit is transferred to by voltage isolator, Sofe Switch control unit is achieved in heater
Make the detection of signal.Sofe Switch control unit in the present embodiment, for receiving the heating unit come from voltage isolator transmission
Heating operation signal；And in the heating operation signal according to heating unit, determine that the heated hold time of heating unit is greater than
Or when being equal to preset second time threshold, determine that heating is abnormal.Heated hold time can be understood as heating unit and not power off
Stop heating continuously powers on heating time, that is to say, that in heated hold time, since heating unit is constantly in heating
State, fixing temperature are likely to continue rising.Too long heated hold time be easy to cause over-heating and causes fire
Calamity, the present embodiment are reduced by limitation of the Sofe Switch control unit to the heated hold time of heating unit because of heating time
Too long a possibility that causing fixing temperature to be more than safety value, improve the security performance of image forming apparatus.
With continued reference to Figure 10, voltage detection unit be can further include: the first detection divider resistance, the second detection partial pressure
Resistance and third detect divider resistance.
Wherein, the zero curve connecting side of one end connection heating part of the first detection divider resistance, the second detection of other end connection
Divider resistance.Third detects one end connection the second detection divider resistance of divider resistance, and the firewire that the other end connects heating part connects
Connect side.First detection divider resistance, the second detection divider resistance and third detection divider resistance are sequentially connected in series, and voltage is examined
The output end for surveying unit is set on the line of the second detection divider resistance and third detection divider resistance.But heating part is connected
When, the first detection divider resistance, the second detection divider resistance and third detection divider resistance also simultaneously turn on, third detection partial pressure
It is ohmically to divide the output voltage signal for foring voltage detection unit, it is transferred to rectification unit.
With continued reference to Figure 10, rectification unit can be bridge rectifier.The input terminal of bridge rectifier connects voltage
The output end of detection unit, the input terminal of the output end connection voltage isolator of bridge rectifier.Bridge rectifier is to electricity
The AC signal of pressure detection unit output is rectified, and the heating operation signal of direct current is obtained.
Optionally, referring to Figure 10, a filter unit can also be set between the output end and ground of rectification unit, filtering is single
Member for example can be the filter capacitor in Figure 10, be filtered for the heating operation signal to direct current, obtain filtered add
Hot working signal is transferred to voltage isolator.
Optionally, referring to Figure 10, voltage isolator can be optocoupler, for example including optical diode current-limiting resistance, hair
Optical diode, phototriode and pull down resistor.Optical diode current-limiting resistance, light emitting diode are connected on the output of rectification unit
Between end and ground, phototriode and pull down resistor are connected between the second DC voltage VCC_2 and ground, and phototriode
Emitter connects one end of pull down resistor, and the collector of phototriode connects the second DC voltage VCC_2, pull down resistor it is another
One end ground connection.The current potential of the emitter connection pull down resistor of phototriode is the output end voltage of state detection unit.If
Voltage detection unit detects that heating operation signal is high level (heating part conducting), and LEDs ON shines, photoelectricity three
Pole pipe receives the luminous of light emitting diode so that collector is connected with emitter, and the partial pressure on pull down resistor increases, state-detection
The output end voltage of unit is high level., whereas if voltage detection unit does not detect that heating operation signal is low level
(heating part power-off), light emitting diode cut-off do not shine, and the collector and emitter cut-off equivalent resistance of phototriode are very big,
Partial pressure on pull down resistor is minimum, and the output end voltage of state detection unit is low level.Sofe Switch control unit is examined in state
When surveying the output end voltage holding high level of unit, which is held time as into heated hold time.
Referring to Figure 11, be a kind of heating unit for image forming apparatus shown in Figure 10 provided in an embodiment of the present invention with
The structural schematic diagram of state detection unit.Heating unit as shown in figure 11 includes second switch K31, diode D31, heating
Portion HEAT3, first switch Q31 etc., state detection unit include resistance R31, resistance R32, resistance R33, rectifier bridge D32, capacitor
The components such as EC31, capacitor C31, optocoupler OP31.Wherein second switch K31 is relay, for controlling the logical of heating part HAET3
Disconnected, diode D31 is the freewheeling diode of relay coil, and first switch Q31 is NPN triode, for controlling relay line
The on-off of circle, resistance R36, resistance R37 are divider resistance, and resistance value ratio ensures that first switch Q31 can saturation conduction.Control signal
It is issued from print control unit, when controlling signal is high level, after resistance R36, resistance R37 partial pressure, first switch Q31 is full
And conducting, second switch K31 coil are powered, second switch K31 switch conduction, heating part heating.Resistance R31, resistance R32, electricity
Resistance R33 is divider resistance, and in parallel with heating part HEAT3 after series connection, resistance value can be selected according to actual needs.Rectifier bridge D32
For the AC signal on dead resistance R33.Capacitor EC31 and capacitor C31 is filter capacitor, can type selecting according to actual needs
Or increase and decrease.Resistance R34 is current-limiting resistance, and resistance R35 is pull down resistor.When second switch K31 conducting, heating part heating, R33
On have an AC signal, after rectified bridge D32 rectification, then filter via capacitor EC31 and capacitor C31, alternating voltage be changed into directly
Galvanic electricity pressure.The DC voltage makes optocoupler diode current flow, i.e. the pole optocoupler secondary CE is connected, and is transferred to the shape of Sofe Switch control unit
The working state signal of state input terminal is high level.When the control signal that print control unit is sent is low level, first is opened
Q31 cut-off is closed, second switch K31 is disconnected, and heating part is not heated.Resistance R31, resistance R32, voltage is all 0 on resistance R33, light
Coupling does not work, and the working state signal for being transferred to the state output terminal of Sofe Switch control unit is low level.The embodiment of the present invention
So that Sofe Switch control unit is monitored the heated hold time of heating unit by state detection unit, compares and monitor other portions
The working state signal of part more can accurately detection image formed device heating abnormality.
The present invention also provides a kind of image forming apparatuses, comprising: print control unit, temperature-sensitive unit, heating unit, and
Power control in any of the above-described embodiment.Realize with Sofe Switch control unit to the heating in image forming apparatus into
Row indirect monitoring；And when determining that heating is abnormal, control DC turns the power supply that DC unit disconnects print control unit, thus cutting
The control signal of image forming apparatus all components is reduced because program fleet, stuck or temperature-sensitive unit detection exception cause to add
A possibility that heat pipe heats always, improves the reliability of the power supply control in image forming apparatus, and then improves image shape
At the security performance of device.
It is a kind of power control method flow diagram of image forming apparatus provided by the invention referring to Figure 12.Upper
On the basis of stating constructive embodiment, image forming apparatus includes print control unit, temperature-sensitive unit, heating unit, Sofe Switch control
Unit and DC processed turn DC unit, and Sofe Switch control unit turns DC unit for controlling the DC and supplies the print control unit
Electricity.The executing subject of the power control method of image forming apparatus shown in Figure 12 can be understood as Sofe Switch control unit,
Method shown in Figure 12 mainly includes step S101 to S103, specific as follows:
S101 obtains the working state signal that described image forms device.
Working state signal can be understood as the print control unit to the enable signal of the heating unit, described
The heating operation signal of the output signal of temperature-sensitive unit or the heating unit.
S102 judges whether that heating is abnormal according to the working state signal.
Specifically, can at least have any in following three kinds of implementations:
In one implementation, the Sofe Switch control unit is according to the print control unit to the heating unit
Enable signal, determine the retention time of the enable signal, if the retention time of the enable signal be greater than or equal to it is default
First time threshold, it is determined that heating is abnormal.
In another implementation, state detection unit detects the output signal of the temperature-sensitive unit, the Sofe Switch
Control unit determine the output signal of state detection unit within a preset period of time from first kind sign mutation be the second class signal
Number, if the number is greater than or equal to preset upper limit number, it is determined that heating is abnormal, wherein the first kind signal
It is used to indicate the enable signal that the heating unit is powered, the second class signal is used to indicate cutting for the heating unit power-off
Stop signal.
In another implementation, state detection unit detects the heating operation signal of the heating unit, Sofe Switch
Control unit obtains the heating operation signal of the heating unit according to the state detection unit, determines the heating unit
Heated hold time, if the heated hold time is greater than or equal to preset second time threshold, it is determined that heating is abnormal.
S103 controls the DC and turns the power supply that DC unit disconnects the print control unit when determining that heating is abnormal.
Sofe Switch control unit disconnects the power supply of the print control unit when determining that heating is abnormal, and it is fixed to reduce generation
A possibility that shadow temperature is more than safety value, other groups of image forming apparatus have also been cut off in the power supply for not only having cut off heating unit
The power supply of part improves the security performance of image forming apparatus.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of power control, including Sofe Switch control unit and DC turn DC unit, the Sofe Switch control unit is used for
Control the print control unit power supply that the DC turns DC unit to image forming apparatus, which is characterized in that
The Sofe Switch control unit is also used to obtain the working state signal of image forming apparatus, is believed according to the working condition
Number, judge whether that heating is abnormal；And when determining that heating is abnormal, controls the DC and turn the DC unit disconnection print control unit
Power supply.
2. power control according to claim 1, which is characterized in that the state of the Sofe Switch control unit inputs
End is connect with the computer heating control output end of the print control unit；
The Sofe Switch control unit is used to receive the heating enable signal exported from the print control unit or heating cut-off
Signal, and when determining that the retention time of the heating enable signal is greater than or equal to preset first time threshold, it determines and adds
Heat anomaly.
3. power control according to claim 1, which is characterized in that further include state detection unit；
The state detection unit connection described image forms the temperature-sensitive unit or heating unit of device；
The state detection unit is used to carry out state-detection to the temperature-sensitive unit or the heating unit, obtains described image
The working state signal of device is formed, and the working state signal is transferred to the Sofe Switch control unit；Wherein, described
The working state signal of image forming apparatus includes the output signal of the temperature-sensitive unit or the heating work of the heating unit
Signal.
4. power control according to claim 3, which is characterized in that the state detection unit includes: comparator
And reference voltage circuit；
The first input end of the comparator is connect with the output end of the temperature-sensitive unit, the second input terminal of the comparator with
The output end of the reference voltage circuit connects, the output end of the comparator respectively with the control terminal of the heating unit and institute
The state output terminal for stating Sofe Switch control unit is connected；
Wherein, the comparator is used for:
The first input end voltage value be less than or equal to second input terminal voltage value when, the comparator it is defeated
Outlet output is for controlling the pick-off signal of the heating unit power-off.
5. power control according to claim 4, which is characterized in that the Sofe Switch control unit, for receiving
The output signal of the comparator；Determine that the output signal of the comparator sports the pick-off signal within a preset period of time
Number, if the number is greater than or equal to preset upper limit number, it is determined that heating is abnormal.
6. power control according to claim 3, which is characterized in that the state detection unit includes: voltage inspection
Survey unit, rectification unit and voltage isolator；
The voltage detection unit is in parallel with the heating part of the heating unit, and the output end of the voltage detection unit connects institute
State the input terminal of rectification unit, the output end of the rectification unit connects the input terminal of the voltage isolator, the voltage every
From the state output terminal that the output end of device connects the Sofe Switch control unit.
7. power control according to claim 6, which is characterized in that the Sofe Switch control unit, for receiving
The heating operation signal of the heating unit come from voltage isolator transmission；And in the heating according to the heating unit
Working signal determines and adds when determining that the heated hold time of the heating unit is greater than or equal to preset second time threshold
Heat anomaly.
8. a kind of image forming apparatus characterized by comprising print control unit, temperature-sensitive unit, heating unit, Yi Jiquan
Benefit requires 1 to 7 any power control.
9. a kind of power control method of image forming apparatus, it includes print control unit, temperature-sensitive list that described image, which forms device,
Member, heating unit, Sofe Switch control unit and DC turn DC unit, and to turn DC mono- for controlling the DC for the Sofe Switch control unit
Member powers to the print control unit；It is characterized in that, which comprises
The Sofe Switch control unit obtains the working state signal that described image forms device, is believed according to the working condition
Number, judge whether that heating is abnormal；And when determining that heating is abnormal, controls the DC and turn the DC unit disconnection print control unit
Power supply；
Wherein, the working state signal includes: enable signal of the print control unit to the heating unit, the sense
The heating operation signal of the output signal of warm unit or the heating unit.
10. according to the method described in claim 9, it is characterized in that, judging whether to heat different according to the working state signal
Often, comprising:
The Sofe Switch control unit according to the print control unit to the enable signal of the heating unit, determine described in make
The retention time of energy signal, if the retention time of the enable signal is greater than or equal to preset first time threshold, it is determined that
Heating is abnormal；
Alternatively, state detection unit detects the output signal of the temperature-sensitive unit, the Sofe Switch control unit determines the shape
The output signal of state detection unit within a preset period of time is the number of the second class signal from first kind sign mutation, if described time
Number is greater than or equal to preset upper limit number, it is determined that heating is abnormal, wherein the first kind signal is used to indicate the heating
The enable signal that unit is powered, the second class signal are used to indicate the pick-off signal of the heating unit power-off；
Alternatively, state detection unit detects the heating operation signal of the heating unit, the Sofe Switch control unit is according to institute
The heating operation signal that state detection unit obtains the heating unit is stated, determines the heated hold time of the heating unit,
If the heated hold time is greater than or equal to preset second time threshold, it is determined that heating is abnormal.
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| CN201811364124.2A CN109240053B (en) | 2018-11-16 | 2018-11-16 | Power supply control apparatus, method and image forming apparatus |
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| CN201811364124.2A CN109240053B (en) | 2018-11-16 | 2018-11-16 | Power supply control apparatus, method and image forming apparatus |
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