JP2008058393A - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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Publication number
JP2008058393A
JP2008058393A JP2006232216A JP2006232216A JP2008058393A JP 2008058393 A JP2008058393 A JP 2008058393A JP 2006232216 A JP2006232216 A JP 2006232216A JP 2006232216 A JP2006232216 A JP 2006232216A JP 2008058393 A JP2008058393 A JP 2008058393A
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Prior art keywords
power consumption
operation mode
image forming
forming apparatus
frequency
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JP2006232216A
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Japanese (ja)
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Eijiro Masaki
栄次郎 正木
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Kyocera Mita Corp
京セラミタ株式会社
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Priority to JP2006232216A priority Critical patent/JP2008058393A/en
Publication of JP2008058393A publication Critical patent/JP2008058393A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D10/00Energy efficient computing
    • Y02D10/10Reducing energy consumption at the single machine level, e.g. processors, personal computers, peripherals or power supply
    • Y02D10/15Reducing energy consumption at the single machine level, e.g. processors, personal computers, peripherals or power supply acting upon peripherals
    • Y02D10/159Reducing energy consumption at the single machine level, e.g. processors, personal computers, peripherals or power supply acting upon peripherals the peripheral being a printer

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the power consumption by a switching electric power as much as possible while securing stable operations in a power-saving operation mode. <P>SOLUTION: A switching frequency input in the power-saving operation mode to the switching power source which controls the output electric power according to an input switching signal is set based upon the total of power consumptions of a plurality of electric devices, connected to an image forming apparatus, in the power-saving operation mode. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image forming apparatus having a normal operation mode in which an image forming operation is possible and a power saving operation mode in which power consumption is reduced as compared with the normal operation mode, and in particular, a switching power supply in the power saving operation mode. Is related to the switching frequency control.

The operation modes of image forming apparatuses such as copiers, facsimiles, and printers include the normal operation mode for normal printing operations and the reduction of power consumption by shutting off the supply of power to some devices inside the apparatus. There are power saving operation modes (also called standby mode, standby mode, etc.) that decrease.
These operation modes are controlled to be switched based on preset mode switching conditions by a control unit such as a CPU that performs overall control of the image forming apparatus. For example, when there is no document image data or print data input in the normal operation mode for a certain period of time, the mode is switched to the power saving operation mode. Or a copy start pressing operation, etc.), the normal operation mode is switched.

On the other hand, the image forming apparatus is provided with a so-called switching power supply represented by a DC / DC converter that controls output power in accordance with the frequency of a switching signal (hereinafter referred to as “switching frequency”). In this case, at the time of switching from the normal operation mode to the power saving operation mode, by setting the switching frequency to a low switching frequency, power consumption due to internal loss such as switching loss in the switching power supply is reduced. (For example, refer to Patent Document 1).
However, if the switching frequency is lowered, the amount of power that can be stably output by the switching power supply decreases. Therefore, if the set value of the switching frequency is too low with respect to the amount of power originally required for the power saving operation mode of the image forming apparatus, the output power from the switching power supply is not stable and the image forming apparatus operates abnormally. There is a risk.
Therefore, the switching frequency in the power saving operation mode needs to be set so that a necessary amount of power can be stably output in the power saving operation mode. However, in the image forming apparatus, the amount of power required in the power saving operation mode differs depending on the number of connected optional devices to the image forming device and the type of the optional devices. In particular, in recent years, since not only predetermined optional devices but also various electric devices are connected to the image forming apparatus, the amount of power required in the power saving operation mode is unclear. Therefore, it is necessary to set the switching frequency with a sufficient margin.
JP 2001-45759 A

However, by setting the switching frequency in the power saving operation mode to a high value with a sufficient margin, stable operation in the power saving operation mode can be realized. There is a problem that power consumption due to internal loss such as switching loss increases. Therefore, it is not preferable from the viewpoint of power saving to set the switching frequency higher than necessary in the power saving operation mode.
Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to form an image that can reduce power consumption by a switching power supply as much as possible while ensuring stable operation in a power saving operation mode. To provide an apparatus.

In order to achieve the above object, the present invention relates to a switching power supply that controls output power in accordance with a switching signal, and an operation mode of the image forming apparatus according to a preset mode switching condition, compared to a normal operation mode in which an image forming operation is possible And a power saving operation mode switching means for switching to a power saving operation mode having a low frequency of the switching signal, and is applied to an image forming apparatus to which one or a plurality of electric devices can be connected, An image characterized in that the frequency of the switching signal in the power saving operation mode is set based on a sum of power consumption in the power saving operation mode by one or a plurality of the electric devices connected to the image forming apparatus. Configured as a forming device.
In the image forming apparatus configured as described above, since the frequency of the switching signal is set in consideration of the power consumption of the power saving operation mode by the connected electrical device, the stable in the power saving operation mode. It is possible to reduce power consumption by the switching power supply as much as possible while ensuring the operation.

Specifically, power consumption information related to the power consumption in the power saving operation mode for each type of the electric device is stored, the type of each of the electric devices connected to the image forming apparatus is specified, and Based on the identified type of each of the electrical devices and the power consumption information, the sum of power consumption by one or more of the electrical devices in the power saving operation mode is calculated. Then, based on the calculated total power consumption, the frequency of the switching signal in the power saving operation mode is set. Thus, the present invention can be implemented.
Further, it is conceivable that the electrical device not included in the power consumption information, that is, an electrical device other than a predetermined electrical device is connected to the image forming apparatus. Therefore, the sum of power consumption immediately before the transition to the power saving operation mode by one or a plurality of electrical devices that are not stored in the power consumption storage unit among the one or more electrical devices connected to the image forming apparatus. Can be measured. Then, the frequency of the switching signal in the power saving operation mode may be set based on the sum of the calculated total power consumption and the measured total power consumption. As a result, even when a wide variety of electrical devices other than predetermined electrical devices are connected to the image forming apparatus, the frequency of the switching signal can be set in consideration of the power consumption of those electrical devices.
Note that the total power consumption immediately before the transition to the power saving operation mode by one or a plurality of the electrical devices connected to the image forming apparatus is measured, and the power saving is based on the measured total power consumption. The frequency of the switching signal in the power operation mode may be set. In this case, it is not necessary to store the power consumption information.

In addition, as a specific method for setting the switching frequency based on the total power consumption in the power saving operation mode, frequency relation information that associates power consumption with the frequency of the switching signal is stored in advance. The frequency of the switching signal in the power saving operation mode is set based on the total power consumption in the power saving operation mode by the one or more electric devices connected to the image forming apparatus and the frequency relation information It is possible to do. Thereby, it is possible to set the frequency of the switching signal to an appropriate value that can reduce power consumption by the switching power supply as much as possible while ensuring stable operation in the power saving operation mode.
At this time, in the frequency-related information, information in which power consumption in a plurality of ranges and switching signal frequencies corresponding to the respective power consumption ranges are associated with each other, or the frequency of the switching signal by substituting the power consumption. What is necessary is just to use the relational expression in which is calculated.

According to the present invention, since the frequency of the switching signal is set in consideration of the power consumption of the power saving operation mode by the connected electrical device, the stable operation in the power saving operation mode is ensured while the frequency is set. The power consumption by the switching power supply can be reduced as much as possible.
Further, by measuring the sum of power consumption immediately before the transition to the power saving operation mode by one or a plurality of electric devices connected to the image forming apparatus, the image forming apparatus has a wide variety other than the predetermined electric devices. Even when various electrical devices are connected, the frequency of the switching signal can be set in consideration of the power consumption of those electrical devices.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that the present invention can be understood. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.
FIG. 1 is a block diagram showing a schematic configuration of an image forming apparatus X according to an embodiment of the present invention. FIG. 2 is a diagram for explaining an example of a procedure of a switching frequency setting process executed in the image forming apparatus X. It is a flowchart of.
First, the schematic configuration of the image forming apparatus X according to the embodiment of the present invention will be described with reference to FIG. The image forming apparatus X corresponds to, for example, a copying machine, a printer device, a facsimile machine, a multi-function machine.
As shown in FIG. 1, an image forming apparatus X according to an embodiment of the present invention includes a CPU, a ROM, a RAM, and the like, and executes the processing according to a predetermined program stored in the ROM, thereby forming the image. Predetermined image processing for a control unit 1 for overall control of the device X, a display / operation unit 2 such as a liquid crystal display and a touch panel, an image reading device (such as a scanner device) not shown, and image data input from the outside An image processing unit 3 for performing image processing, an image forming unit 4 for forming an image on a sheet supplied from a paper supply cassette (not shown) based on image data subjected to predetermined image processing by the image processing unit 3, A switching power supply 5 that controls output power in accordance with an input switching signal, and the switching signal having an arbitrary frequency generated by an instruction from the control unit 1 The external I / F 7 using a switching signal output unit 6 that outputs to the power source 5, an external interface (I / F) 7 for electrically connecting various electric devices, and various current sensors known in the art. The power consumption measuring unit 8 that measures the power consumption of each electrical device connected to each other, and various types of information such as power consumption information and frequency related information described later used in a switching frequency setting process (see the flowchart of FIG. 2) described later. And a storage unit 9 such as a hard disk (an example of power consumption information storage means and frequency-related information storage means).

  The switching power supply 5 converts power supplied from a commercial AC power supply or the like into predetermined DC power based on a switching signal input from the switching signal output unit 6 and outputs the DC power. In the image forming apparatus X, the power output from the switching power supply 5 is supplied to each of the constituent elements so that an image forming operation is performed. The electric power output from the switching power supply 5 is also supplied to an electric device connected to the external I / F 7. That is, the power consumption by the switching power supply 5 is not limited to the internal components of the image forming apparatus X, but also depends on externally connected electrical equipment.

The switching signal output unit 6 includes an RC oscillator that can generate a switching signal at an arbitrary frequency by arbitrarily changing an RC time constant. The switching signal output unit 6 is configured to switch the frequency of the switching signal input to the switching power supply 5 (hereinafter referred to as “switching frequency”) according to an instruction from the control unit 1 in a switching frequency setting process (see the flowchart of FIG. ").
It should be noted that the switching signal output unit 6 may include a crystal resonator or the like as another embodiment. In this case, an arbitrary switching frequency cannot be generated, but a plurality of crystal resonators that generate signals of different frequencies are provided, and the generated switching frequency is changed by switching the crystal resonators. It is possible. The switching signal output unit 6 is not limited to these, and may employ other configurations in which the switching frequency is variable.

The external I / F 7 is connected to a stapling device 11, an automatic document feeder (ADF) 12, and a hard disk drive (HDD) 13 (each of which is an example of an electric device). Here, the stapling device 11 and the ADF 12 are standard electric devices (hereinafter referred to as “optional devices”) defined in advance as electric devices connectable to the image forming apparatus X, and the HDD 13 is a non-standard electric device. It is assumed that it is a device (hereinafter referred to as “non-standard device”). The stapling device 11, the ADF 12, and the hard disk 13 are electrically connected to the external I / F 7 by, for example, a SCSI cable or a USB cable.
Further, the external I / F 7 has a device type specifying function (an example of a device type specifying unit) for specifying the type of each electric device connected to the external I / F 7. Specifically, the device type specifying function reads the identification information of each electrical device stored in a storage means such as an IC tag or a ROM provided in each electrical device, or obtains it by data communication, thereby obtaining the electrical device. This function identifies the type of each device. Note that the type of the electric device specified by the device type specifying function is, for example, a product name, a model number, or a function type of the electric device. Then, the identification result by the device type identification function of the external I / F 7 is input to the control unit 1.

By the way, the image forming apparatus X, like the conventional apparatus, has a normal operation mode in which an image forming operation by the image forming unit 4 can be performed, and power to some devices (such as the image forming unit 4) in the apparatus. It has a mode switching function for switching a power saving operation mode for reducing power consumption by cutting off the supply based on a preset mode switching condition. The mode switching function is implemented by a process executed by the control unit 1. Here, the control unit 1 when executing processing for switching from the normal operation mode to the power saving operation mode corresponds to the power saving operation mode switching means.
For example, when there is no document image data or print data input in the normal operation mode for a certain period of time, the mode is switched to the power saving operation mode. Or a copy start pressing operation, etc.), the normal operation mode is switched.

As described above, conventionally, in the power saving operation mode, the switching frequency of the switching power supply 5 is set to be lower than the switching frequency in the normal operation mode. The power consumption due to internal loss can be reduced. It is also possible to reduce electromagnetic waves generated by lowering the switching frequency.
However, in the image forming apparatus X, since the power consumption in the power saving operation mode also depends on the power consumption in the power saving operation mode by the stapling apparatus 11, the ADF 12, and the HDD 13, conventionally, the image forming is performed. In order to prevent the abnormal operation of the device X, it is necessary to set the switching frequency to a high value with a sufficient margin.
However, in the image forming apparatus X, the switching frequency setting process described later (see the flowchart in FIG. 2) is executed by the control unit 1, so that the switching frequency in the power saving operation mode becomes the external I / F 7. Is set to a value that takes into account the power consumption in the power saving operation mode by the electrical equipment connected to the. This point will be described in detail later.

Here, the power consumption information and the frequency related information stored in the storage unit 9 will be described.
The power consumption information includes power consumption in the power saving operation mode of the image forming apparatus X alone and power consumption in the power saving operation mode for each type of the optional device connectable to the image forming apparatus X. It is remembered. This power consumption information is created by measuring power consumption in the power saving operation mode by each of the optional devices in advance.
Specifically, the power consumption information includes power consumption in the power saving operation mode by the stapling apparatus 11 and the ADF 12 which are optional devices, but in the power saving operation mode by the HDD 13 which is a non-standard device. Power consumption is not included.

On the other hand, the frequency-related information defines a switching frequency at which the switching power supply 5 can stably output an arbitrary amount of power, and the power consumption is related to the frequency of the switching signal in advance. It is. Specifically, a plurality of ranges of power consumption are associated with the switching frequencies corresponding to each of the power consumption ranges.
For example, the power consumption is 1 W or more and less than 2 W, the switching frequency is 100 kHz, the power consumption is 2 W or more and less than 3 W, the switching frequency is 120 kHz, and so on. Therefore, when the power consumption in the image forming apparatus X is 1 W, the switching power supply 5 is stabilized by extracting and setting the switching frequency corresponding to the power consumption 1 W from the frequency-related information. Power output is possible.
Since the frequency-related information varies depending on the characteristics of the switching power supply 5, it is desirable to set it for each model of the switching power supply 5. For example, a plurality of the frequency-related information is stored, and the frequency used in the switching frequency setting process (see the flowchart of FIG. 2) described later according to the type of the switching power supply 5 mounted on the image forming apparatus X. You may comprise so that relationship information may be selected.

Hereinafter, an example of the procedure of the switching frequency setting process executed by the control unit 1 according to a predetermined control program will be described with reference to the flowchart of FIG. In the figure, S1, S2,... Represent processing procedure (step) numbers.
The switching frequency setting process is executed when the image forming apparatus X is in the normal operation mode, and the process starts from step S1.
First, in step S1, the control unit 1 determines whether or not it is necessary to shift to the power saving operation mode according to the mode switching condition. For example, as described above, when no document image data or print data is input for a predetermined time or more, it is determined that the transition to the power saving operation mode is necessary.
Here, while it is determined that the transition to the power saving operation mode is not necessary, the determination of step S1 is repeatedly executed (No side of S1), but the transition to the power saving operation mode is necessary. If it is determined (Yes in S1), the process proceeds to step S2.

  In step S <b> 2, the control unit 1 determines whether an electrical device is connected to the external I / F 7. Here, since the stapling device 11, the ADF 12, and the HDD 13 are connected to the external I / F 7, it is determined that an electrical device is connected to the external I / F 7 (Yes side of S2), and processing Shifts to step S3.

In step S <b> 3, the control unit 1 determines whether there is a non-standard device among the electric devices connected to the external I / F 7. Specifically, the determination is made based on the identification result input to the control unit 1 by the device type identification function of the external I / F 7. The specification of the device type by the device type specifying function of the external I / F 7 is performed when the electric device is connected to the external I / F 7 or in step S3.
Here, since the HDD 13 is connected, it is determined that a non-standard device is connected (Yes in S3), and the process proceeds to step S4. If it is determined that a non-standard device is not connected (No in S3), the process proceeds to step S6 described later.

In step S4, the power consumption measuring unit 8 is controlled by the control unit 1, whereby the power consumption of the HDD 13 is measured by the power consumption measuring unit 8, and the measured power consumption value is represented by the control unit 1. Is input.
Thus, in step S4, the power consumption of the HDD 13 immediately before the image forming apparatus X shifts to the power saving operation mode is measured in order to obtain the power consumption in the power saving operation mode by the HDD 13. When a plurality of non-standard devices are connected to the external I / F 7, the power consumption in the power saving operation mode by the plurality of non-standard devices is measured and input to the control unit 1.
In the subsequent step S5, the control unit 1 calculates the total power consumption measured in the step S4. Here, the control unit 1 and the power consumption measurement when the processing for measuring the total power consumption immediately before shifting to the power saving operation mode by the non-standard device connected to the image forming apparatus X is executed. The unit 8 is an example of power consumption measuring means. Here, since the power consumption of only the HDD 13 is measured in the step S4, the power consumption becomes the calculated value in the step S5.

Next, in step S6, based on the power consumption information stored in the storage unit 9 by the control unit 1 and the type of each optional device specified by the device specifying function of the external I / F 7, The total power consumption in the power saving operation mode by each of the optional devices is calculated. Here, the control unit 1 when executing such calculation processing corresponds to power consumption calculation means.
Here, since the stapling apparatus 11 and the ADF 12 are connected to the external I / F 7 as optional devices, the power consumption corresponding to each of the stapling apparatus 11 and the ADF 12 is extracted from the power consumption information, and the consumption The total power is calculated.
If no optional device is connected to the external I / F 7, the total power consumption here is 0, and the process proceeds to the next step S7. Alternatively, when the control unit 1 determines whether or not an optional device is connected to the external I / F 7 in the previous stage of the step S6 and skips the processing of the step S6 when determining that it is not connected. Then, the process may be shifted to step S7 as another embodiment.

In step S7, the control unit 1 calculates the sum of the total power consumption of the non-standard devices calculated in steps S4 to S5 and the total power consumption of the optional devices calculated in step S6. Is done. That is, the total amount of power consumed by all the electrical devices connected to the image forming apparatus X in the power saving operation mode is calculated.
Thereafter, in step S8, the control unit 1 calculates the sum of the power consumption calculated in step S7 and the power consumption of the image forming apparatus X alone in the power saving operation mode. At this time, the power consumption of the image forming apparatus X alone is extracted from the power consumption information stored in the storage unit 9.

In step S9, the control unit 1 uses the entire image forming apparatus X in the power saving operation mode, that is, the power consumption calculated in step S8 or the consumption extracted in step S21 described later. Based on the power and the frequency relation information stored in the storage unit 9, the switching frequency corresponding to the power consumption is extracted. For example, from the correspondence stored in the frequency relationship information, when the total power consumption is 2 W, 120 kHz is extracted as the switching frequency corresponding to the power consumption.
Next, in step S10, the switching signal output unit 6 is controlled by the control unit 1, so that the frequency of the switching signal generated by the switching signal output unit 6 is the switching frequency extracted in step S9. (Here, it is set to 120 kHz). That is, the frequency of the switching signal in the power saving operation mode is set based on the total power consumption in the power saving operation mode by a plurality of electric devices connected to the external I / F 7 of the image forming apparatus X. The Here, the control unit 1 when executing such setting processing corresponds to switching frequency setting means.
As a result, the switching frequency changing process ends, and subsequently, the control unit 1 executes a process for shifting the image forming apparatus X to the power saving operation mode. Since this process is not different from the prior art, the description thereof is omitted.

By the way, when it is determined in step S2 that no electrical device is connected to the external I / F 7 (No side of S2), the process proceeds to step S21.
In step S21, the control unit 1 extracts the power consumption in the power saving operation mode of the image forming apparatus X alone from the power consumption information stored in the storage unit 9. Thereafter, the process proceeds to step S9. In this case, since the image forming apparatus X is a single unit, power consumption in the power saving operation mode is minimum, and therefore the switching frequency is also set to a minimum. For example, when the power consumption in the power saving operation mode by the image forming apparatus X alone is 1 W, the switching frequency is set to 100 kHz.

  As described above, in the image forming apparatus X, immediately before the operation mode shifts from the normal operation mode to the power saving operation mode, the switching frequency in the power saving operation mode is set to the external I / F 7. Since it can be set according to the power consumption of the entire image forming apparatus X in consideration of the power consumption in the power saving operation mode by the connected electrical equipment, the stable operation in the power saving operation mode is ensured while The power consumption by the switching power supply 5 can be reduced as much as possible.

In the embodiment, the power consumption in the power saving operation mode by the optional device is stored in the storage unit 9 as power consumption information by storing the power consumption in the power saving operation mode by the optional device. Although the case where the measurement process is omitted has been described as an example, the power consumption in the power saving operation mode by all the electric devices connected to the external I / F 7 is immediately before the transition to the power saving operation mode. Measuring can also be considered as another example.
FIG. 3 is a flowchart for explaining the switching frequency setting process according to the first embodiment. In the switching frequency setting process according to the first embodiment, the same processing steps as those in the switching frequency setting process (see the flowchart of FIG. 2) described in the embodiment are denoted by the same reference numerals, and the description thereof is omitted. Omitted.
As shown in FIG. 3, in the switching frequency setting process according to the first embodiment, steps S31 and S32 are executed instead of steps S3 to S7 (see the flowchart of FIG. 2).
In step S31 executed following step S2, the control unit 1 controls the power consumption measuring unit 8 so that each electric device connected to the external I / D 7 by the power consumption measuring unit 8 is controlled. The measured power consumption value is input to the control unit 1. In step S32, the control unit 1 calculates the total power consumption measured in step S31. The said control part 1 when performing the process of this step S31, 32 here is an example of a power consumption measuring means.
In the subsequent processing after step S8, the switching frequency setting processing is similarly executed based on the total power consumption measured in steps S31 and S32. Even by such a processing procedure, it is possible to appropriately set the switching frequency in consideration of the power consumption in the power saving operation mode by the electric device connected to the image forming apparatus X.

In the embodiment, the storage unit 9 stores information associating a plurality of ranges of power consumption with the switching frequencies corresponding to the power consumption ranges as the frequency-related information. As described above as an example, it is also possible to store a relational expression in which the frequency of the switching signal is calculated by substituting power consumption as the frequency relation information.
For example, FIG. 4 is a graph showing an example of the relationship between the power consumption of the entire image forming apparatus X and an appropriate switching frequency at the time of the power consumption. If the relational expression representing the graph shown in FIG. 4 is stored in the storage unit 9 as the frequency relation information, the image forming apparatus X calculated in step S8 in steps S9 to S10 (see FIG. 2). By substituting the overall power consumption in the power saving operation mode into the relational expression and setting an appropriate switching frequency calculated from the relational expression, the stable operation in the power saving operation mode is ensured. The power consumption by the switching power supply 5 can be reduced as much as possible.

1 is a block diagram showing a schematic configuration of an image forming apparatus according to an embodiment of the present invention. 6 is a flowchart for explaining an example of a procedure of a switching frequency setting process executed in the image forming apparatus according to the embodiment of the present invention. The flowchart for demonstrating the other example of a switching frequency setting process. The graph for demonstrating the other example of frequency related information.

DESCRIPTION OF SYMBOLS 1 ... Control part 2 ... Display / operation part 3 ... Image processing part 4 ... Image formation part 5 ... Switching power supply 6 ... Switching signal output part 7 ... External interface 8 ... Power consumption measuring part (an example of power consumption measuring means)
9. Storage unit (an example of power consumption information storage means and frequency-related information storage means)
11 ... Staple device (an example of electrical equipment)
12 ... ADF (an example of electrical equipment)
13 ... HDD (an example of electrical equipment)

Claims (6)

  1. A switching power supply that controls output power in accordance with a switching signal, and an operation mode of the image forming apparatus in accordance with a preset mode switching condition. An image forming apparatus to which one or a plurality of electrical devices can be connected,
    Switching frequency setting means for setting a frequency of the switching signal in the power saving operation mode based on a sum of power consumption in the power saving operation mode by the one or more electric devices connected to the image forming apparatus. An image forming apparatus comprising the image forming apparatus.
  2. Power consumption storage means for storing power consumption information relating to power consumption in the power saving operation mode for each type of the electric equipment, and equipment type specifying means for specifying the type of each of the electric equipment connected to the image forming apparatus Power consumption calculation for calculating a sum of power consumption by one or a plurality of the electric devices in the power saving operation mode based on the type of each of the electric devices specified by the device type determination means and the power consumption information And further comprising means,
    2. The image forming apparatus according to claim 1, wherein the switching frequency setting unit sets the frequency of the switching signal in the power saving operation mode based on the total power consumption calculated by the power consumption calculation unit. .
  3. Measures the total power consumption immediately before the transition to the power saving operation mode by one or a plurality of electrical devices that are not stored in the power consumption storage unit among the one or more electrical devices connected to the image forming apparatus Further comprising power consumption measuring means,
    The switching frequency setting means, based on the sum of the power consumption calculated by the power consumption calculation means and the sum of power consumption measured by the power consumption measurement means, the switching signal in the power saving operation mode. The image forming apparatus according to claim 2, wherein the frequency is set.
  4. And further comprising power consumption measuring means for measuring a total power consumption immediately before the transition to the power saving operation mode by one or a plurality of the electric devices connected to the image forming apparatus,
    2. The image forming apparatus according to claim 1, wherein the switching frequency setting unit sets the frequency of the switching signal in the power saving operation mode based on a total power consumption measured by the power consumption measuring unit. .
  5. Frequency-related information storage means for storing frequency-related information that relates power consumption and the frequency of the switching signal in advance;
    The switching frequency setting means includes a sum of power consumption in the power saving operation mode by one or a plurality of the electric devices connected to the image forming apparatus, and the frequency relation information stored in the frequency relation information storage means. The image forming apparatus according to claim 1, wherein the frequency of the switching signal in the power saving operation mode is set based on the above.
  6.   The frequency-related information is information in which power consumption in a plurality of ranges and switching signal frequencies corresponding to each of the power consumption ranges are associated, or the frequency of the switching signal is calculated by substituting the power consumption. The image forming apparatus according to claim 5, wherein the image forming apparatus is a relational expression.
JP2006232216A 2006-08-29 2006-08-29 Image forming apparatus Pending JP2008058393A (en)

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Cited By (3)

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US20100166442A1 (en) * 2008-12-26 2010-07-01 Brother Kogyo Kabushiki Kaisha Image output apparatus
JP2014027719A (en) * 2012-07-24 2014-02-06 Toshiba Tec Corp Electronic apparatus and printer
JP2014072934A (en) * 2012-09-28 2014-04-21 Kyocera Document Solutions Inc Image forming apparatus

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US20100166442A1 (en) * 2008-12-26 2010-07-01 Brother Kogyo Kabushiki Kaisha Image output apparatus
US8369721B2 (en) * 2008-12-26 2013-02-05 Brother Kogyo Kabushiki Kaisha Image output apparatus having power saving modes
JP2014027719A (en) * 2012-07-24 2014-02-06 Toshiba Tec Corp Electronic apparatus and printer
JP2014072934A (en) * 2012-09-28 2014-04-21 Kyocera Document Solutions Inc Image forming apparatus

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