JP2008061352A - Electric equipment and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve leveling of power consumption in the whole device by rationally executing power supply in the device. <P>SOLUTION: The leveling of power consumption in the whole device is achieved by the following electric equipment. The electric equipment is provided with: a first power supply means 204 for supplying power to a required load; a second power supply means 203 capable of storing the power supplied from the first power supply means; a switching means 206 for switching a source which supplies power to a specific load to either of the first power supply means and the second power supply means; a charging means that charges so as to store the power supplied from the first power supply means in the second power supply means, when the second power supply means stops power supply to the load; and a control means that controls the switching means to the second power supply means side, when power consumption measured by a commercial power consumption measurement means for measuring power supplied from the commercial power supply to the whole electric equipment including the first power supply means, exceeds the maximum power that can be supplied from the commercial power supply. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electrical apparatus and an image forming apparatus, and particularly relates to distribution of power supplied in the apparatus.

  In an apparatus using an electrophotographic process such as an electrophotographic copying machine, an electrostatic printer, or a facsimile, a developer (hereinafter referred to as toner) is applied to an electrostatic latent image obtained by irradiating light onto a photosensitive member. Thus, an image is formed. Then, after the image is transferred onto a recording medium such as transfer paper by the transfer device, the unfixed toner image is fixed on the recording medium by the fixing device. As a fixing device, a heat roller fixing device having a heating roller formed by forming a release resin film on the surface of a cylindrical metal core and a pressure roller having an elastic body layer in pressure contact with the heating roller is widely used. Has been. With the surface temperature of the heating roller reaching a predetermined fixing temperature, the recording medium carrying the unfixed toner image is placed in the nip portion between the heating roller and the pressure roller so that the toner image surface is in contact with the heating roller. The toner image is fused and fixed on the surface of the recording medium by heat and pressure.

  Since the heating roller needs to be raised to a predetermined fixing temperature within a predetermined time when it is started up, it requires a large amount of heat, that is, electric power.

  In recent years, in order to shorten the start-up time, a method of reducing the heat capacity by reducing the thickness of the heating roller has been adopted, but on the other hand, heat is easily taken away by the recording medium passing through the fixing unit during the printing operation. It also has the disadvantages.

  Therefore, a greater amount of heat, that is, electric power is required during the printing operation, particularly during the printing operation immediately after the apparatus is started up.

In addition to the main body, the image forming apparatus includes an image reading unit having an automatic document feeder (ADF) used when reading an image original, a collation of a recording medium that has been processed by the main body, and bookbinding. A post-processing device that handles post-processing is added, and overall power consumption tends to increase.
On the other hand, there is a standard such as a maximum of 15 A for a commercial power source that can be generally used, and power that can be supplied from a single plug is limited. If a device exceeding this is used, it is not preferable because it imposes a burden on the user such as the necessity of power supply work.

  Therefore, power can be stored in an auxiliary power source that can be stored when the device is not in use, and when the device power consumption increases, power is supplied from the auxiliary power source to some loads to reduce the maximum power consumption. A technique has been proposed (see Patent Documents 1 and 2).

In recent years, as such a rechargeable power storage device, an electric double layer capacitor having a small internal resistance and capable of charging / discharging with a large current has been increased in capacity and put into practical use.
JP 2000-315567 A JP 2004-236492 A

  However, such a rechargeable auxiliary power source cannot supply sufficient power if it is not sufficiently charged. Even if the image forming apparatus is not used, the charge of the auxiliary power source cannot be reduced due to leakage current or the like, so that the stored power gradually decreases in the uncharged state.

  For this reason, in Patent Document 1, power is supplied to the fixing heating unit using an auxiliary power source when the apparatus is started up. However, when the auxiliary power source is not fully charged, the desired heating cannot be performed, so that the target temperature cannot be reached within a predetermined heating time, and the start of printing is delayed, resulting in a decrease in productivity.

  In recent years, in order to increase the fixing heating speed, the above-described roller thinning is performed, and a so-called IH type heating apparatus using induction heating is also used as a heating source. In this case, since the output current from the capacitor is a direct current, it is difficult to superimpose electric power on the IH heating that is an alternating current application.

  In order to avoid this, a configuration including a dedicated heating source driven by an auxiliary power source as described in JP-A No. 2002-162854 increases the entire fixing device and increases the cost.

  On the other hand, the above-mentioned patent document 2 includes a configuration for assisting power other than fixing heating. However, since power consumption prediction for each load is used for power assist switching and charging current determination, composite images in recent years with various operation modes are used. Control is complicated in the forming apparatus. Further, an error in calculation of instantaneous power becomes large during parallel operation of a plurality of loads, and there is a risk of driving for a long time with the maximum supply power of commercial power.

  Further, when a halogen lamp that is often used for fixing heating is used, the power consumption of the lamp is constant, so the average power can only be adjusted by the lighting ratio. Therefore, the instantaneous power when the lamp is lit is constant and does not decrease.

  Therefore, it is almost impossible when the lamp is lit even if surplus power is used for auxiliary power charging. For this reason, charging is intermittent and not efficient (see FIG. 6). Further, in order to increase the charging speed, the charging current at the time of charging must be increased, so that the power supply capacity on the charging current supply side is also increased.

  SUMMARY An advantage of some aspects of the invention is that it provides an electrical apparatus and an image forming apparatus capable of rationally supplying power in the apparatus and leveling the power consumption of the entire apparatus. Is.

  In order to solve the above-described problems, in the present invention, the electric device and the image forming apparatus are configured as described in the following (1) to (4).

  (1) First power supply means for supplying power to a required load, second power supply means capable of storing power supplied from the first power supply means, and power supply to a specific load Switching means for switching the source to one of the first power supply means and the second power supply means, and when the second power supply means is not supplying power to the specific load, Charging means for charging so that the power supplied from one power supply means is stored in the second power supply means, and measuring the power supplied from the commercial power source to the entire electrical equipment including the first power supply means And switching the switching means to the second power supply means side when the power consumption measured by the commercial power consumption measurement means exceeds the maximum power that can be supplied by the commercial power supply. Control system Electrical equipment comprising a means.

  (2) In an image forming apparatus including an image reading apparatus, a first power supply unit that supplies power to a required load of the image forming apparatus and power supplied from the first power supply unit can be stored. A second power supply means; a switching means for switching a power supply source to the image reading apparatus to one of the first power supply means and the second power supply means; and the second power supply means. Charging means for charging the power supplied from the first power supply means to be stored in the second power supply means when power is not supplied to the image reading device; and the first power supply A commercial power consumption measuring unit that measures power supplied from a commercial power source to the entire image forming apparatus including the unit, and a power consumption measured by the commercial power consumption measuring unit exceeds a maximum power that can be supplied by the commercial power source. The image forming apparatus and a control means for controlling to switch the switching means the the second power supply means side.

  (3) First power supply means for supplying power to a required load, second power supply means capable of supplying power to a specific load and capable of storing power, and the specific load And a third power supply means capable of supplying power to the second power supply device, a power supply source for the specific load, and the second power supply means and the third power supply. Switching means for switching to one of the means, and charging means for charging the second power supply means from the third power supply means when the second power supply means is not supplying power to the specific load And commercial power consumption measuring means for measuring power supplied from a commercial power source to the entire electrical equipment including the first power supply means and the third power supply means, and power consumption measured by the commercial power consumption measurement means Supplied from the commercial power supply When the power exceeds the maximum power, the power supply to the specific load is performed from the second power supply means, and the measured power consumption is less than a predetermined value less than the maximum suppliable power of the commercial power supply. And the control means for controlling the switching means and the charging means so that the third power supply means supplies power to the specific load and charges the second power supply means at a required current value. , Comprising electrical equipment.

  (4) In an image forming apparatus including an image reading device, a first power supply unit that supplies power to a required load, and a second power that can supply power to the image reading device and store power A power supply means; a third power supply means capable of supplying power to the image reading apparatus and the second power supply apparatus; and a power supply source for the image reading apparatus. Switching means for switching to one of a supply means and a third power supply means, and when the second power supply means is not supplying power to the image reading apparatus, the third power supply means to the second power supply means Charging means for charging the power supply means, commercial power consumption measuring means for measuring power supplied from a commercial power source to the entire image forming apparatus including the first power supply means and the third power supply means, and Commercial power consumption When the power consumption measured by the fixing means exceeds the power that can be supplied by the commercial power source, the second power supply means supplies power to the image reading apparatus, and the measured power consumption is the commercial power supply. When the power source is less than a predetermined value smaller than the maximum power that can be supplied, the third power supply means supplies power to the image reading device and charges the second power supply means with a required current value. An image forming apparatus comprising: a control unit that controls the switching unit and the charging unit.

  According to the present invention, it is possible to rationally supply power within the apparatus and level the power consumption of the entire apparatus.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to an example of a copying apparatus.

First embodiment

  FIG. 2 is a sectional view showing a schematic configuration of the copying apparatus according to the first embodiment of the present invention. This copying apparatus is roughly composed of a reader unit and a printer unit.

  In FIG. 2, reference numeral 1 denotes a document feeder, which feeds documents placed on a document tray one by one or two consecutively to a predetermined position on the platen glass surface 2. The document feeder 1 may be configured by either an RDF that circulates a document and discharges it to the original document stacking table or an ADF that conveys the document in one direction and discharges it to the sheet discharging table.

A scanner 4 includes a document illumination lamp 3, a scanning mirror 5, and the like. When a document is placed on the document table glass surface 2 by the document feeder 1, the scanner 4 is scanned in a predetermined direction and reflects the reflected light of the document. The image passes through the lens 8 via the scanning mirrors 5 to 7 and forms an image on the image sensor unit 101.
Reference numeral 10 denotes an exposure control unit composed of a laser scanner, which irradiates the photoconductor 11 with a light beam modulated based on image data output from the image signal control unit of the controller unit CONT. Reference numerals 12 and 13 denote developing units that visualize the electrostatic latent image formed on the photoreceptor 11 with a developer (toner) of a predetermined color.

  Reference numerals 14 and 15 denote recording medium storage units on which fixed-size recording media are stacked and stored. The recording medium is fed to the position where the registration roller 25 is arranged by driving the feeding roller and temporarily stopped. Thereafter, the recording medium is re-fed in a state in which the image leading edge alignment timing with the image formed on the photoconductor 11 is taken. The A transfer separation charger 16 transfers the toner image developed on the photosensitive member 11 to a recording medium, and then separates the toner image from the photosensitive member 11. Thereafter, the recording medium is conveyed through a conveying belt, and is fixed by passing through a nip formed by a facing portion between the fixing roller 26 and the pressure roller 17.

  A paper discharge roller 18 discharges the recording medium on which the image is formed to the tray 20. A direction flapper 21 switches the conveyance direction of the recording medium on which the image is formed to one of the discharge port direction and the internal conveyance path direction, and prepares for the multiplex / double-side image forming process. Reference numeral 19 denotes a paper discharge sensor, which monitors the discharge state of the recording medium.

FIG. 1 is a block diagram showing a power supply system in the present embodiment.
The same elements as those in FIG. 201 is a commercial power supply source, and the maximum supply current is 15A. A control unit 202 controls the operation of the printer unit.

  Reference numeral 1 denotes a document feeder, and a power source Vr having a constant voltage is supplied from a DC / DC converter 205 as a power source. Reference numeral 206 denotes a switch as a power source switching device that switches a power source supplied to the DC / DC converter 205 to one of a DC power source 204 and an electric double layer capacitor 203 as a chargeable auxiliary power source, and a switching signal 208 from the control unit 202. Controlled by.

Reference numeral 207 denotes an FET for controlling a charging current to the capacitor 203. The charging current Ichg is determined by the frequency and ON ratio of the signal 209 that drives the FET 207 and is variable.
A voltage detection signal 210 notifies the control unit 202 of the terminal voltage Vcap of the capacitor 203.

  An AC current detection unit 214 measures a current Itotal proportional to the power used by the digital copying machine and notifies the control unit 202 of the current Itotal.

  The current Itotal is determined by the sum of the power consumed by the fixing unit 211 represented by the current Ifix, the power supplied from the DC power source 204 to the DC load 213, and other power consumed by the AC load 212. A reverse current blocking diode 215 prevents the current from flowing backward.

  Next, the power control of the copying apparatus will be described with reference to FIG.

  When the power of the copying apparatus is turned on, the fixing unit 211 operates at the maximum power in order to bring the fixing roller 26 to a predetermined temperature within a predetermined time. However, since no printing operation is performed at this time, loads such as other motors do not operate.

Therefore, the total current Itotal measured by the current detector 214 is lower than the AC upper limit current. Therefore, when the terminal voltage Vcap of the capacitor 203 does not reach the saturation voltage due to discharge or the like, the switch 206 that supplies power to the DC / DC converter 205 is on the DC power supply 204 side. Therefore,
Ichg≈Iacmax-Itotal (Iacmax is the upper limit current of the AC power source) (Equation 1)
The capacitor 203 can be charged with the charging current determined by

  The control unit 202 adjusts the operation ratio of the FET 207 by the control signal 209 and performs control so that Ichg becomes a calculated value.

  Therefore, the actual Itotal is added to the hatched portion of the figure corresponding to the charging current Ichg, and becomes the AC upper limit (see FIG. 3 (301)).

  Next, when the fixing unit 211 reaches a predetermined temperature, the printing operation becomes possible.

  When the printing operation is started, the fixing unit 211 continues the heating operation while adjusting the power so as to keep the temperature of the fixing roller 26 at the target temperature in order to replenish the heat taken away by the recording medium passing therethrough.

  Further, since loads such as other motors and solenoids are operating, the current consumption Itotal approaches the AC upper limit value.

  However, when the reading unit 1 is not operating, the consumption current Itotal does not yet reach the upper limit value, so that the capacitor 203 can be charged with Ichg calculated by Equation 1.

  However, when the terminal voltage Vcap reaches the saturation voltage, the control unit 202 reduces the operation ratio of the FET 207. Further, the charging current Ichg becomes 0 and the charging is finished (302).

  At this time, in the fixing unit 211, only the heating roller 26 is initially warmed, and the surrounding members and atmosphere are not yet saturated, but heat is gradually accumulated by continuing heating. As a result, the power required to keep the heating roller 26 at the target temperature is reduced. When a system capable of arbitrarily setting the supply power such as IH heating is adopted as the heating source of the fixing device 211, the current consumption Ifix of the fixing device gradually decreases, so that the current consumption Itotal of the main body also decreases. Go.

  Next, when the reading unit 1 is operated in this state, the consumption current Ir increases.

  Since the current Ir is supplied from the DC power source 204, the total current consumption Itotal is also added to the current Ir. For this reason, when the current Itotal exceeds the AC supply allowable upper limit, the control unit 202 that has detected that the upper limit has been exceeded via the AC current detection unit 214 switches the switch 206 to the capacitor (capacitor module) 203 side by the control signal 208. Thus, the power stored in the capacitor 203 is set to be supplied to the reading unit 1 through the DCDC converter 205.

  As a result, the output current of the DC power supply 204 is reduced, so that the total consumption current Itotal is also reduced (303).

  If the power supply from the capacitor 203 is continued as it is, the capacitor 203 releases the stored energy, so that the remaining energy decreases, and the terminal voltage Vcap decreases in proportion thereto (304). However, the voltage Vr applied to the reading unit 1 is adjusted by the DC / DC converter 205 and is constant.

When the capacitor 203 exhausts energy and reaches the lower limit voltage, the control unit 202 detects that the lower limit of Vcap has been reached via the detection signal 210, so the switch 206 is switched to the DC power supply 204 side again to the reading unit 1. Ensure that power supply continues.
Therefore, the total consumption current Itotal also rises again by the reader consumption current Ir. At this time, the area around the fixing device is further heated over time, and the power necessary for maintaining the fixing temperature is reduced. Has also decreased.
Therefore, since the total current consumption Itotal does not exceed the AC upper limit, the operation can be continued as it is (305).

  If the operation is continued as it is, the power required for fixing is further reduced, so that the difference between the AC current upper limit and the total current consumption Itotal is further widened.

  Then, the control unit 202 can recharge the capacitor 203 with the charging current Ichg calculated by (Equation 1), and the capacitor terminal voltage Vcap also increases accordingly.

  Since the increment of Itotal at this time is also a hatched portion as in the periods (301) to (302), the actual Itotal is substantially the same as the AC upper limit until charging is completed (306).

  Next, the power assist operation in an operation mode different from that in FIG. 3 will be described with reference to FIG.

  The example of FIG. 4 is an operation from a state in which the capacitor 203 has almost released energy at the time of startup after the power of the copying apparatus is turned on. The terminal voltage Vcap of the capacitor 203 is naturally at the lower limit voltage.

  At this time, since the switch 206 is in the charging mode, the control unit 202 controls the FET 207 to charge the capacitor 203 with the charging current Ichg calculated by (Equation 1), as in the example of FIG. 3 (see (401) of FIG. 4). ).

  Next, when the temperature of the fixing unit 211 reaches a printable state, the printing operation is started. When the reading unit 1 operates almost simultaneously, the total consumption current Itotal exceeds the AC upper limit, so the control unit 202 sets Ichg to 0 before the capacitor terminal voltage Vcap reaches the saturation voltage, and switches the switch 206 to the capacitor 203 side. Switch (403).

  The reading unit 1 and the printing unit continue to operate in parallel by driving the reading unit 1 with the output power of the capacitor 203 (402).

  However, since the capacitor 203 has not accumulated energy up to the saturation voltage, the terminal voltage Vcap reaches the lower limit voltage in a short time.

  Therefore, the control unit 202 connects the switch 206 to the DC power supply 204 side in response to the Vcap reaching the lower limit voltage, and continues the operation of the reading unit 1. However, since the elapsed time from the start-up is short and the fixing unit 211 is not sufficiently warmed, the amount of power supplied to the fixing unit 211 remains large, so the total current consumption Itotal again exceeds the AC upper limit.

  In this case, since the capacitor 203 has already released all the energy and cannot perform the auxiliary operation, the control unit 202 switches the printing speed of the printing unit to a low speed (including control to increase the conveyance interval of the recording medium). As a result, the current consumed by the printing unit, in particular the current Ifix consumed by the fixing unit 211, decreases, so that the total consumption current Itotal becomes equal to or less than the AC upper limit (404).

  If the operation is continued as it is, the fixing unit 211 is also warmed and the required power is reduced (405). Eventually, when the control unit 202 determines that the reading unit 1 and the printing unit can operate simultaneously even if the total consumption current Itotal recovers the printing speed, the control unit 202 returns the printing speed to a high speed again (406).

  Thereafter, if the total current consumption Itotal further decreases, the capacitor 203 can be charged again (407).

  As described above, according to the first embodiment, it is possible to rationally supply power within the apparatus and level the power consumption of the entire apparatus.

Second embodiment

  FIG. 5 is a block diagram showing a power supply system of the copying apparatus according to the second embodiment. Components similar to those in FIG. 1 are given the same numbers.

  In FIG. 5, reference numeral 502 denotes a sub DC power supply that exclusively takes charge of power supply to the reading unit 1 and charging of the capacitor 203. Reference numeral 501 denotes a current measuring unit that measures the current consumption Ir of the reading unit 1 and notifies the control unit 202 of the current consumption Ir.

  In the configuration of FIG. 5, the switch is configured so that the power supply to the image reading apparatus 1 is supplied from the capacitor 203 when the power consumption of the copying apparatus detected by the AC current detection unit 214 exceeds the power that can be supplied by the commercial power supply. 206 is switched to the capacitor 203 side. If the power consumption of the copying apparatus is equal to or less than a predetermined value smaller than the maximum power that can be supplied by the commercial power supply, the switch 206 is connected to the DC power supply 502 side so that power is supplied to the image reading apparatus 1 from the DC power supply 502. Switch to. The predetermined value is, for example, 80% of the maximum supply power of the commercial power supply, but is not limited to this. Further, the control unit 202 controls the FET 207 so that the DC power source 502 charges the capacitor 203 with a required current value. The charging current value at that time is optimized as needed so as not to exceed the maximum suppliable power of the DC power source 502 based on the measurement value by the reading unit current detection unit 501.

As described in the first embodiment, when the copying apparatus is in a state where the capacitor 203 can be charged, the charging current Ichg is first expressed as Ichg1≈Iacmax−Itotal (Iacmax is the upper limit current of the AC power source) (Equation 1 ) '
Is set to Ichg1 obtained by

However, at this time, since the sub DC power supply 502 needs to supply power to the reading unit 1 at the same time, assuming that the maximum supply current of the power supply 502 is Imaxsup, the charging current Ichg is Ichg2≈Imaxsup−Ir (Expression 2)
But there is an upper limit.

  Therefore, the control unit 202 also measures Ir as needed via the reading unit current detection unit 501, and the actual charging current Ichg is constantly adjusted to the smaller one of Ichg1 and Ichg2.

The capacity of the sub DC power source 502 is Imaxsup≈Irmax (Irmax is the maximum value of the reading unit current Ir)
Thus, it is economical without unnecessarily increasing the capacity of the capacitor 203.

  As described above, according to this embodiment, it is possible to rationally supply power within the apparatus and level the power consumption of the entire apparatus.

(Modification)
In the first and second embodiments, the load that is assisted by the capacitor 203 is used as the reading unit. However, if the load is intermittently driven independently of the operation of the main body printing unit, power leveling can be similarly performed.

  Further, although the FET 207 is used to control the charging current of the capacitor 203, other current adjusting elements can be used as long as a necessary variable current can be given to the capacitor.

The figure which shows the electric power supply system in 1st Embodiment. 1 is a schematic diagram showing a schematic configuration of a copying apparatus according to a first embodiment. Operation explanatory diagram in the first embodiment Operation explanatory diagram in the first embodiment The figure which shows the electric power supply system in 1st Embodiment. Illustration of conventional example

Explanation of symbols

1 Image Reading Unit 202 Control Unit 203 Capacitor 204 DC Power Supply 206 Switch 207 Current Control FET
214 AC current detector

Claims (15)

A first power supply means for supplying power to a required load;
Second power supply means capable of storing power supplied from the first power supply means;
Switching means for switching a power supply source to a specific load to one of the first power supply means and the second power supply means;
Charging means for charging so that the power supplied from the first power supply means is stored in the second power supply means when the second power supply means is not supplying power to the specific load. When,
Commercial power consumption measuring means for measuring the power supplied from the commercial power supply to the entire electrical equipment including the first power supply means;
Control means for controlling the switching means to switch to the second power supply means when the power consumption measured by the commercial power consumption measurement means exceeds the maximum power that can be supplied by the commercial power supply;
An electrical apparatus comprising: The electric device according to claim 1,
The electrical device is characterized in that the specific load is a peripheral device connected to the electrical device and operating intermittently. In the electric equipment according to claim 1 or 2,
The electrical device according to claim 1, wherein the charging unit is a current control element that extracts a required current from an output of the first power supply unit and supplies the current to the second power supply unit. The electric device according to any one of claims 1 to 3,
Remaining power measuring means for measuring the remaining power that can be supplied by the second power supply means,
The control means prohibits switching the switching means to the second power supply means when the remaining power measured by the remaining power measuring means is equal to or less than a predetermined threshold, and the total power consumption of the electrical equipment The electrical device controls the operation of the electrical device so that the power becomes less than or equal to the maximum suppliable power of the commercial power supply. The electric device according to claim 4,
The control means controls the total power consumption of the electric device to be less than or equal to the maximum suppliable power of the commercial power supply by reducing the charging current to the second power supply means. machine. The electric device according to claim 5,
The amount by which the charging current is reduced is obtained from the difference between the total power consumption measured value obtained from the commercial power consumption measuring means and the maximum suppliable power of the commercial power supply. In an image forming apparatus including an image reading device,
First power supply means for supplying power to a required load of the image forming apparatus;
Second power supply means capable of storing power supplied from the first power supply means;
Switching means for switching a power supply source to the image reading apparatus to one of the first power supply means and the second power supply means;
Charging means for charging so that the power supplied from the first power supply means is stored in the second power supply means when the second power supply means is not supplying power to the image reading apparatus. When,
Commercial power consumption measuring means for measuring power supplied from a commercial power source to the entire image forming apparatus including the first power supply means;
Control means for controlling the switching means to switch to the second power supply means when the power consumption measured by the commercial power consumption measurement means exceeds the maximum power that can be supplied by the commercial power supply;
An image forming apparatus comprising: The image forming apparatus according to claim 7.
Remaining power measuring means for measuring the remaining power that can be supplied by the second power supply means,
The control unit prohibits switching the switching unit to the second power supply unit when the remaining power measured by the remaining power measuring unit is equal to or less than a predetermined threshold, and the total consumption of the image forming apparatus An image forming apparatus, wherein operation of the image forming apparatus is controlled so that electric power is less than or equal to a maximum suppliable electric power of the commercial power source. The image forming apparatus according to claim 8.
A fixing device that heats and fixes a toner image formed on a recording medium; and a fixing power supply unit that supplies power to the fixing device.
The image forming apparatus is characterized in that the control unit controls the total power consumption of the image forming apparatus to be equal to or less than the maximum suppliable power of the commercial power supply by reducing the power supplied by the fixing power supply unit. apparatus. The image forming apparatus according to claim 9.
The image forming apparatus according to claim 1, wherein the control unit reduces power supplied from the fixing power supply unit by increasing a conveyance interval of the recording medium. The image forming apparatus according to claim 9.
The image forming apparatus according to claim 1, wherein the control unit reduces the power supplied from the fixing power supply unit by reducing an image forming speed. A first power supply means for supplying power to a required load;
A second power supply means capable of supplying power to a specific load and storing power;
Third power supply means capable of supplying power to the specific load and the second power supply device;
Switching means for switching the power supply source for the specific load to one of the second power supply means and the third power supply means;
Charging means for charging the second power supply means from the third power supply means when the second power supply means is not supplying power to the specific load;
Commercial power consumption measuring means for measuring the power supplied from the commercial power source to the entire electrical equipment including the first power supply means and the third power supply means;
When the power consumption measured by the commercial power consumption measuring unit exceeds the power that can be supplied from the commercial power source, the measured power consumption is performed so that power is supplied to the specific load from the second power supply unit. When the power is below a predetermined value smaller than the maximum power that can be supplied from the commercial power source, the third power supply means supplies power to the specific load and the second power supply means has a required current value. Control means for controlling the switching means and the charging means to charge at
An electrical apparatus comprising: The electrical device according to claim 12,
The maximum suppliable power of the third power supply means is an electric device capable of continuously driving the specific load. The electric device according to claim 13,
A specific load power consumption measuring means for measuring the power consumption of the specific load;
The electric device characterized in that the charging current value by the charging means is optimized at any time so that the measured value by the specific load power consumption measuring means does not exceed the maximum suppliable power of the third power supply means. In an image forming apparatus including an image reading device,
A first power supply means for supplying power to a required load;
A second power supply means capable of supplying power to the image reading apparatus and storing the power;
A third power supply means capable of supplying power to the image reading device and the second power supply device;
Switching means for switching a power supply source for the image reading apparatus to one of the second power supply means and the third power supply means;
Charging means for charging the second power supply means from the third power supply means when the second power supply means is not supplying power to the image reading device;
Commercial power consumption measuring means for measuring power supplied from a commercial power source to the entire image forming apparatus including the first power supply means and the third power supply means;
When the power consumption measured by the commercial power consumption measuring means exceeds the power that can be supplied by the commercial power supply, the power consumption to the image reading device is supplied from the second power supply means, and the measured consumption When the power is equal to or less than a predetermined value smaller than the maximum power that can be supplied by the commercial power supply, the third power supply means supplies power to the image reading apparatus and the second power supply means supplies a required current value. Control means for controlling the switching means and the charging means to charge at
An image forming apparatus comprising:

Images