JP2013073193A - Electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic device which surely shuts down electricity supply to whole device when power source is cut off, while suppressing electric power consumption.SOLUTION: An electronic device includes an AC/DC converter 101, a first capacitor C1 and a sleep CPU91. The electronic device also includes a first switch 102 which is connected between the AC/DC converter 101 and the first capacitor C1, and electrically connects or disconnects the AC/DC converter 101 and the first capacitor C1 based on control of the sleep CPU91. The electronic device further includes a second switch 103 which is connected between the first capacitor C1 and the sleep CPU91. The second switch 103 electrically connects the first capacitor C1 with the sleep CPU91 when direct current voltage is outputted from the AC/DC converter 101 and electrically disconnects the first capacitor C1 from the sleep CPU91 when direct current voltage is not outputted from the AC/DC converter 101.

Description

  The present invention relates to an electronic device capable of cutting off power supplied to each unit.

  An example of the electronic device is an image forming apparatus such as a printer or a copier. Some image forming apparatuses are capable of mutually switching between a normal mode in which an image can be formed on a sheet and an energy saving mode in which an image cannot be formed on a sheet in order to reduce power consumption. is there. In such an image forming apparatus, when the normal mode is set, power is supplied to each part and the storage battery constituting the image forming apparatus so that each part can be operated and the storage battery is charged. Yes. Further, in the image forming apparatus, power is supplied from the rechargeable battery to each part of the image forming apparatus when the energy saving mode is set (see Patent Document 1).

  Some image forming apparatuses include a power supply device including an AC switch disposed on the primary side and a DC switch disposed on the secondary side. In the power supply apparatus, the AC switch and the DC switch operate in conjunction with each other to prevent power from being supplied to the load connected to the secondary side when the image forming apparatus stops. (See Patent Document 2).

JP 2004-74558 A JP 2004-336894 A

  However, even when the image forming apparatus described in Patent Document 1 supplies power to each part of the image forming apparatus from the storage battery, even when the power of the image forming apparatus is turned off (OFF), Continue to supply power to each part from the storage battery. This is because the image forming apparatus is not provided with means for detecting that the power supply unit has been turned off. As a result, the image forming apparatus described in Patent Document 1 can be used even when the power of the image forming apparatus is turned off when power is supplied from the storage battery to each part of the image forming apparatus. It may not be possible to turn it off.

  Further, in the power supply device described in Patent Document 2, when the AC switch is turned off, the DC switch is turned off in conjunction with the AC switch. However, in order to turn off the DC switch in conjunction with the AC switch, the power supply device requires an insulation switch such as a photocoupler, which increases power consumption.

  It is an object of the present invention to provide an electronic device that reliably cuts off the power supply to the entire apparatus when the power is turned off while suppressing an increase in power consumption.

  The present invention relates to a converter that converts an AC voltage into a DC voltage, a charge storage unit that is electrically connected to the converter and is capable of storing or discharging charges, and is electrically connected to the converter and the charge storage unit. Electrically connected between the converter and the charge storage unit and electrically connected to the converter and the charge storage unit based on the control of the control unit. Is electrically connected between the charge storage unit and the control unit, and when the DC voltage is output from the converter, the charge storage unit and the control unit are electrically connected. The present invention relates to an electronic device comprising: a second switch that is electrically connected and electrically disconnects the charge storage unit and the control unit when no DC voltage is output from the converter.

  Moreover, it is preferable that the input side of the converter is electrically connected with a third switch capable of blocking an AC voltage from being input to the converter.

  In addition, when the control unit controls to disconnect the first switch in order to reduce power consumption, the result of detecting the voltage value of the DC voltage input to the control unit is a predetermined value. It is preferable to control the first switch to be electrically connected when the voltage value is less than the value.

  ADVANTAGE OF THE INVENTION According to this invention, the electronic device which interrupts | blocks the electric power supply to the whole apparatus reliably can be provided, when a power supply is interrupted | blocked, suppressing an increase in power consumption.

It is a figure for demonstrating the whole structure of the copying machine which concerns on one Embodiment of an electronic device. 2 is a block diagram illustrating a functional configuration of a copier. FIG. It is a figure for demonstrating the circuit structure of a copier. 6 is a flowchart for explaining the operation of the copier when the energy saving mode is set. It is a figure which shows the relationship between an electric current value and efficiency.

  With reference to the drawings, an embodiment of an electronic apparatus of the present invention will be described. The electronic device of the present invention can shift between a normal mode in which a normal operation is performed and a power saving mode in which consumed power is reduced. An example of the electronic apparatus is a copier 1 (image forming apparatus). For this reason, a copier will be described below as an example. First, the overall configuration of the copy machine 1 will be described. FIG. 1 is a diagram for explaining the overall configuration of a copier 1 according to an embodiment of an electronic apparatus.

As shown in FIG. 1, the copier 1 of the present embodiment includes a document transport unit 10, a document reading unit 20, a paper transport unit 30, an image forming unit 40, a transfer unit 50, and a fixing unit 60. Prepare.
The document transport unit 10 is an ADF (Automatic Document Feeder), and includes a document placement unit 11, a first feed roller 12, a guide 13, a timing roller pair 14, and a document discharge unit 15. The first feed roller 12 supplies the document G placed on the document placement unit 11 to the timing roller pair 14 one by one in order. The timing roller pair 14 is a timing at which the document reading unit 20 reads an image of the document G and a timing at which the document G is supplied to a position where the image of the document G is read by the document reading unit 20 (a position where the guide 13 is disposed). In order to match, the conveyance of the original G or the conveyance stop of the original G is performed. The guide 13 guides the conveyed document G to a first reading surface 21a described later. The document discharge unit 15 discharges the document G whose image has been read by the document reading unit 20 (passed through the guide 13) to the outside of the copier body 2.
A document stacking unit 16 is formed outside the copying machine main body 2 in the document discharge unit 15. In the document stacking unit 16, the documents G discharged from the document discharge unit 15 are stacked and stacked.

  The document reading unit 20 includes a first reading surface 21a and a second reading surface 22a. The first reading surface 21 a is formed along the upper surface of the first contact glass 21 disposed to face the guide 13 and serves as a surface for reading an image of the document G. The second reading surface 22a is disposed adjacent to the first reading surface 21a (in the case shown in FIG. 1, over the most right side of the first reading surface 21a). The second reading surface 22 a is used when reading an image of the document G without using the document transport unit 10. The second reading surface 22a is formed along the upper surface of the second contact glass 22 on which the document G is placed, and serves as a surface for reading an image of the document G.

  The document reading unit 20 includes an illumination unit 23, a first mirror 24, a second mirror 25, a third mirror 26, an imaging lens 27, and an imaging unit 28 inside the copier body 2. . The illumination unit 23 and the first mirror 24 move in the sub-scanning direction X, respectively. The second mirror 25 and the third mirror 26 are disposed on the left side of the illumination unit 23 and the first mirror 24 in FIG. Further, the second mirror 25 and the third mirror 26 are the first reading surface 21 a or the second reading surface 22 a through the first mirror 24, the second mirror 25, the third mirror 26, and the imaging lens 27. To the imaging unit 28 while moving in the sub-scanning direction X while keeping the distance (optical path length) constant.

  The illumination unit 23 is a light source that irradiates the original G with light. The first mirror 24, the second mirror 25, and the third mirror 26 are mirrors for guiding the light reflected by the document G to the imaging lens 27 while keeping the optical path length constant. The imaging lens 27 focuses the light incident from the third mirror 26 on the imaging unit 28. The imaging unit 28 is an imaging device for obtaining image data based on an imaged optical image by converting incident light into an electrical signal. For example, the imaging unit 28 is a CCD (Charge Coupled Device) or a CMOS (Complementary). It is an image sensor such as Metal Oxide Semiconductor).

The paper transport unit 30 includes a second feed roller 31, a third feed roller 32, a registration roller pair 33, and a paper discharge unit 34. The second feed roller 31 supplies paper T (image forming medium) stored in the paper feed cassette 36 to the transfer unit 50. The third feed roller 32 supplies the paper T (image forming medium) placed on the manual feed tray 37 to the transfer unit 50. The registration roller pair 33 performs the conveyance of the paper T or the conveyance stop of the paper T in order to match the timing when the toner image reaches the transfer unit 50 and the timing when the paper T is supplied to the transfer unit 50. Further, the registration roller pair 33 performs skew (oblique feeding) correction of the paper T. The paper discharge unit 34 discharges the paper T on which the toner image is fixed to the outside of the copier body 2.
A paper discharge stacking unit 35 is formed outside the copier body 2 in the paper discharge unit 34. In the paper discharge stacking unit 35, the paper T discharged from the paper discharge unit 34 is stacked and stacked.

The image forming unit 40 is for forming a toner image. The image forming unit 40 includes a photosensitive drum 41, a charging unit 42, a laser scanner unit 43, a developing device 44, a cleaning unit 45, a toner cartridge 46, 1 A next transfer roller 47, an intermediate transfer belt 48, and a counter roller 49 are provided.
The photoconductor drum 41 (41a, 41b, 41c, 41d) functions as a photoconductor or an image carrier in order to form toner images of black, cyan, magenta, and yellow, respectively. Around each photosensitive drum 41a, 41b, 41c, 41d, in order from the upstream side to the downstream side along the rotation direction of the photosensitive drum 41, a charging unit 42, a laser scanner unit 43, a developing device 44, A cleaning unit 45 is disposed. The charging unit 42 charges the surface of the photosensitive drum 41. The laser scanner unit 43 is arranged apart from the surface of the photosensitive drum 41 and scans and exposes the surface of the photosensitive drum 41 based on image data relating to the original G read by the original reading unit 20. As a result, the exposed portion of the charge is removed from the surface of the photosensitive drum 41 to form an electrostatic latent image. The developing device 44 forms a toner image by attaching toner to the electrostatic latent image formed on the surface of the photosensitive drum 41. The cleaning unit 45 removes toner and the like remaining on the surface of the photosensitive drum 41 after the surface of the photosensitive drum 41 is neutralized by a static eliminator (not shown).
The toner cartridge 46 stores toner of each color supplied to the developing device 44. The toner cartridge 46 and the developing device 44 are connected by a toner supply path (not shown).

  The primary transfer rollers 47 (47a, 47b, 47c, 47d) are arranged on the opposite sides of the intermediate transfer belt 48 from the photosensitive drums 41a, 41b, 41c, 41d, respectively. The intermediate transfer belt 48 is a belt that passes through the image forming unit 40 and the transfer unit 50. A part of the intermediate transfer belt 48 is sandwiched between the photosensitive drums 41a, 41b, 41c, and 41d and the primary transfer rollers 47a, 47b, 47c, and 47d, and the photosensitive drums 41a, 41b, 41c, and 41d. The toner image formed on the surface is primarily transferred. The opposing roller 49 is a driving roller that is disposed inside the intermediate transfer belt 48 having an annular shape, and advances the intermediate transfer belt 48 in the direction of arrow A shown in FIG.

  The transfer unit 50 includes a secondary transfer roller 51. The secondary transfer roller 51 is disposed on the side opposite to the counter roller 49 with respect to the intermediate transfer belt 48, and a part of the intermediate transfer belt 48 is sandwiched between the counter roller 49. Further, the secondary transfer roller 51 secondarily transfers the toner image primarily transferred to the intermediate transfer belt 48 onto the paper T.

  The fixing unit 60 includes a heating rotator 61 and a pressure rotator 62. The heating rotator 61 and the pressure rotator 62 sandwich the paper T on which the toner image is secondarily transferred, melt and pressurize the toner, and fix the toner to the paper T.

Next, the functional configuration of the copy machine 1 will be described. FIG. 2 is a block diagram showing a functional configuration of the copy machine 1.
The copier 1 includes the above-described components (the document transport unit 10, the document reading unit 20, the paper transport unit 30, the image forming unit 40, the transfer unit 50, and the fixing unit 60). The engine unit 3 is configured by the paper transport unit 30, the image forming unit 40, the transfer unit 50, and the fixing unit 60. Note that the description of the components described with reference to FIG. 1 is omitted.
Further, the copier 1 includes an operation unit 70, a storage unit 80, and a control unit 90 in addition to the functional configuration described above.

  The operation unit 70 includes a numeric keypad (not shown), a touch panel (not shown), a start key (not shown), and the like. The numeric keypad is operated to input numbers such as the number of copies to be printed. The touch panel displays a plurality of keys to which various functions (for example, a function for setting a print magnification and a function for allocating a plurality of pages to one sheet of paper T (such as 2 in 1)) are assigned. A key displayed on the touch panel is operated to cause the copier 1 to execute any of various functions. The start key is operated to execute printing. When any key is operated, the operation unit 70 supplies a signal indicating that this key has been operated to the control unit 90.

  The storage unit 80 includes a hard disk, a semiconductor memory, and the like. The storage unit 80 stores image data based on the document G read by the document reading unit 20. Further, the storage unit 80 stores a control program used in the copier 1, data used by the control program, and the like.

  The control unit 90 controls the document conveying unit 10, the document reading unit 20, the engine unit 3, the operation unit 70, and the like.

  Next, with reference to FIG. 3, a circuit configuration of a characteristic part of the copier 1 according to the present embodiment will be described. FIG. 3 is a diagram for explaining a circuit configuration of the copy machine 1.

  The copier 1 includes a power supply unit 100 (power supply) and a circuit body 120. The power supply unit 100 includes an AC / DC converter 101 (corresponding to the “converter” of the present invention), a charge storage unit, a first switch 102, and a second switch 103. Further, a main body switch 111 (corresponding to the “third switch” of the present invention) is arranged in the circuit on the input side of the power supply unit 100. The circuit body 120 includes the control unit 90 described above. The control unit 90 includes a sleep CPU (Central Processing Unit) 91 and a system CPU 92.

  The main body switch 111 is a switch for turning on (ON) or turning off (OFF) the power of the copier 1. That is, the main body switch 111 can block the AC voltage from being input to the AC / DC converter 101.

  The AC / DC converter 101 converts an alternating voltage into a direct voltage. A main body switch 111 is electrically connected to the input side (primary side) of the AC / DC converter 101.

  The charge storage unit is capable of storing charges and discharging the stored charges. For example, the charge storage unit is a capacitor. Hereinafter, the charge storage unit will be described as “first capacitor C1”. The first capacitor C1 is electrically connected to the AC / DC converter 101.

  The control unit 90 (sleep CPU 91) is electrically connected to the AC / DC converter 101 and the first capacitor C1.

  The first switch 102 is electrically connected between the AC / DC converter 101 and the first capacitor C1. The first switch 102 electrically connects or disconnects the AC / DC converter 101 and the first capacitor C1 based on the control of the control unit 90 (sleep CPU 91).

  The second switch 103 is electrically connected between the first capacitor C1 and the control unit 90 (sleep CPU 91). The second switch 103 electrically connects the first capacitor C1 and the control unit 90 when a DC voltage is output from the AC / DC converter 101. On the other hand, the second switch 103 electrically disconnects the first capacitor C1 and the control unit 90 when no DC voltage is output from the AC / DC converter 101.

  The control unit 90 (sleep CPU 91) described above detects the voltage value of the DC voltage input to the control unit 90 when controlling the first switch 102 to be disconnected in order to reduce power consumption. When the result becomes less than a predetermined voltage value, the first switch 102 is controlled to be electrically connected.

Next, the circuit configuration of the copy machine 1 will be described in detail.
A commercial power supply 110 is connected to the primary side of the AC / DC converter 101 via the rectifying element 105 and the main body switch 111 of the copier 1. For example, the AC / DC converter 101 converts an AC voltage of 100 V into a DC voltage of 3.3 V and outputs the converted voltage to the secondary side. A second capacitor C2, a first resistor R1, a second resistor R2, and a first switch 102 are connected to the output side of the AC / DC converter 101. That is, the first resistor R1 and the second resistor R2 are connected in series. Further, the circuit in which the first resistor R1 and the second resistor R2 are connected in series and the second capacitor C2 are connected in parallel.
Note that if the AC / DC converter 101 can intermittently oscillate, power consumption can be suppressed when the output current decreases.

  The first switch 102 is a switch circuit such as a transistor, for example. A terminal that controls whether the first switch 102 is turned on or off (an opening / closing control terminal (a base terminal when the first switch 102 is a transistor)) is between the first resistor R1 and the second resistor R2. , Connected to the fourth switch 104.

  The fourth switch 104 is a switch circuit such as a transistor, for example. A terminal that controls whether the fourth switch 104 is turned on or off (open / close control terminal (a base terminal when the fourth switch 104 is a transistor)) is connected to the sleep CPU 91 via the third resistor R3. . That is, the sleep signal is supplied from the sleep CPU 91 to the open / close control terminal (base terminal) of the fourth switch 104.

  The fourth switch 104 is turned off when a low sleep signal is supplied from the sleep CPU 91. In this case, the first switch 102 is turned on because a DC voltage is supplied to the open / close control terminal (base terminal). On the other hand, the fourth switch 104 is turned on when a high sleep signal is supplied from the sleep CPU 91. In this case, the first switch 102 is turned off because no DC voltage is supplied to the open / close control terminal (base terminal).

  The system CPU 92 is connected to the subsequent stage of the first switch 102, and the diode D, the first capacitor C1, the second switch 103, and the third capacitor C3 are connected. The fourth resistor R4 and the first capacitor C1 are connected in series. Furthermore, the circuit in which the fourth resistor R4 and the first capacitor C1 are connected in series and the third capacitor C3 are connected in parallel.

The system CPU 92 is supplied with the output voltage V1 of the power supply unit 100 as the power supply voltage Vcc.
When the first switch 102 is on, a DC voltage is supplied from the AC / DC converter 101 to the first capacitor C1 via the diode D and the fourth resistor R4. Thus, the first capacitor C1 can store a relatively large amount of charge. On the other hand, the first capacitor C1 is discharged when the first switch 102 is OFF.

  The second switch 103 is a switch circuit such as a transistor, for example. A terminal that controls whether the second switch 103 is turned on or off (an opening / closing control terminal (a base terminal when the second switch 103 is a transistor)) is connected to the AC / DC converter 101 via a fifth resistor R5. And the first switch 102 are electrically connected. When the main body switch 111 is on, a DC voltage is supplied from the AC / DC converter 101 to the open / close control terminal (base terminal) of the second switch 103 via the fifth resistor R5. Turn on. On the other hand, when the main body switch 111 is off, since no DC voltage is supplied from the AC / DC converter 101 to the open / close control terminal (base terminal) of the second switch 103, the second switch 103 is turned off.

  The sleep CPU 91 is connected to the subsequent stage of the third capacitor C3. The output voltage V2 of the power supply unit 100 is supplied to the sleep CPU 91 as the power supply voltage Vcc. The sleep CPU 91 is connected to a sixth resistor R6 and a seventh resistor R7 in order to measure the voltage value of the power supply voltage Vcc input to the sleep CPU 91. The sleep CPU 91 determines whether or not the power storage of the first capacitor C1 has decreased by monitoring the voltage value of the power supply voltage Vcc using the sixth resistor R6 and the seventh resistor R7.

Next, the operation of the copy machine 1 in this embodiment will be described.
First, a case where the copying machine 1 is set to a normal mode capable of forming an image on the paper T will be described.

  When the copier 1 is set to the normal mode, the main body switch 111 is turned on, so that the AC voltage is supplied from the commercial power source 110 to the AC / DC converter 101. When the copy machine 1 is set to the normal mode, the sleep CPU 91 outputs a low sleep signal. For this reason, the fourth switch 104 is turned off.

  The AC / DC converter 101 converts an AC voltage into a DC voltage of a predetermined voltage (for example, 3.3V) and outputs the DC voltage. When a DC voltage is output from the AC / DC converter 101, the first switch 102 and the second switch 103 are turned on. For this reason, the first capacitor C1 is charged. Further, the power supply voltage Vcc is supplied to each of the system CPU 92 and the sleep CPU 91.

  Next, a case where the copy machine 1 is set to an energy saving mode for reducing power consumption will be described. FIG. 4 is a flowchart for explaining the operation of the copier 1 when the energy saving mode is set.

  In step ST1, the sleep CPU 91 determines whether or not to shift from the normal mode to the energy saving mode. For example, the sleep CPU 91 determines to shift from the normal mode to the energy saving mode when the copy machine 1 has not been operated for a predetermined time. If the mode does not shift to the energy saving mode (No), the determination in step ST1 is performed again. When shifting to the energy saving mode (Yes), the process proceeds to step ST2.

  In step ST2, the sleep CPU 91 outputs a high (High) sleep signal. As a result, the fourth switch 104 is turned on, while the first switch 102 is turned off. In addition, since the main body switch 111 is kept on, the second switch 103 is kept on. Then, the first capacitor C1 is discharged. For this reason, the power supply voltage Vcc is supplied to the sleep CPU 91 from the first capacitor C1. Then, the sleep CPU 91 monitors the voltage of the first capacitor C <b> 1 by measuring the voltage value of the power supply voltage Vcc input via the circuit configured by the sixth resistor R <b> 6 and the seventh resistor R <b> 7. On the other hand, the system CPU 92 stops operating because the power supply voltage Vcc is not supplied.

  In step ST3, the sleep CPU 91 determines whether or not the measured voltage value of the power supply voltage Vcc (the voltage of the first capacitor C1) is less than a predetermined voltage value (threshold value). Here, the predetermined voltage value is a voltage value higher than the minimum operating voltage of the sleep CPU 91. If the voltage value of the power supply voltage Vcc is higher than the predetermined voltage value (No), the determination in step ST3 is performed again. If the voltage value of the power supply voltage Vcc is lower than the predetermined voltage value (Yes), the process proceeds to step ST4.

  In step ST4, the sleep CPU 91 outputs a low (Low) sleep signal. As a result, the fourth switch 104 is turned off while the first switch 102 is turned on, so that the first capacitor C1 is charged.

  In step ST5, the sleep CPU 91 determines whether or not the charging of the first capacitor C1 in step ST4 is completed. If charging has not been completed (No), the determination in step ST5 is performed again. If charging is complete (Yes), the process proceeds to step ST6.

  In step ST6, the sleep CPU 91 performs counting for a predetermined time.

In step ST7, when the count of step ST6 is completed, the sleep CPU 91 outputs a high (High) sleep signal. As a result, the fourth switch 104 is turned on, while the first switch 102 is turned off. Thus, the first capacitor C1 is reliably charged by ensuring a sufficient charging time for the first capacitor C1. Then, the first capacitor C1 is discharged. That is, the power supply voltage Vcc is supplied from the first capacitor C1 to the sleep CPU 91.
After step ST7, the process returns to step ST1.

  Next, a case where the main body switch 111 is turned off will be described. When the main body switch 111 is turned off, the AC / DC converter 101 does not output a DC voltage because no AC voltage is supplied from the commercial power supply 110. As a result, the first switch 102 and the second switch 103 are turned off, so that the power supply voltage Vcc is not supplied to the circuit body 120 (sleep CPU 91 and system CPU 92).

As described above, according to the copying machine 1 of the present embodiment, the following effects are produced.
That is, in the copier 1 of this embodiment, the control unit 90 controls the first switch 102 to electrically connect or disconnect the AC / DC converter 101 and the first capacitor C1. . Further, when a DC voltage is output from the AC / DC converter 101, the copier 1 electrically connects the first capacitor C1 and the control unit 90 (sleep CPU 91) by the second switch 103, and the AC / DC When the DC voltage is not output from the converter 101, the first switch C1 and the control unit 90 (sleep CPU 91) are electrically disconnected by the second switch 103. Therefore, the copy machine 1 is arranged to the entire apparatus (for example, the sleep CPU 91 and the system CPU 92) when the commercial power supply 110 is cut off (when the main body switch 111 is turned off) by arranging the second switch 103. The power supply (supply voltage supply) can be cut off reliably and promptly.

  In addition, since the copier 1 arranges the second switch 103 on the secondary side of the AC / DC converter 101 and controls on / off of the second switch 103 based on the output of the AC / DC converter 101, An increase in power can be suppressed. That is, when the second switch is turned off based on detecting that the main body switch is turned off, a circuit for detecting that the main body switch is turned off and transmitting the detection result to the second switch is required. Become. For example, when the detection result that the main body switch is turned off is transmitted by the photocoupler, it is necessary to supply a current of about 10 mA to the photodiode of the photocoupler. And when the voltage value of a commercial power supply is 100V, the power consumption of a photocoupler will be 1W. On the other hand, in the copier 1 of the present embodiment, the power required to turn off the second switch 103 is several tens of mW, and the power required to operate the AC / DC converter 101 (about 0. Even if 3W) is taken into consideration, an increase in power consumption can be suppressed.

  In the copy machine 1, a main body switch 111 capable of blocking the input of an AC voltage to the AC / DC converter 101 is connected to the input side of the AC / DC converter 101. As a result, the copier 1 can block the AC voltage supplied to the AC / DC converter 101 when the main body switch 111 is turned off.

  The copier 1 is input to the control unit 90 (sleep CPU 91) when the control unit 90 (sleep CPU 91) controls to disconnect the first switch 102 in order to reduce power consumption. When the result of detecting the voltage value of the DC voltage becomes less than a predetermined voltage value, the first switch 102 is electrically connected. Thereby, the copy machine 1 can shift the normal mode and the energy saving mode to each other. Further, when the copier 1 is set in the energy saving mode, power is supplied from the first capacitor C1 that is efficiently charged during the period set in the normal mode, so that it is possible to reduce power consumption.

  FIG. 5 is a diagram showing the relationship between the current value and the efficiency. For example, assuming that the power supply voltage when set to the normal mode is 3.3V, the maximum output current is 10A, and the efficiency is about 80%, the output voltage when the energy saving mode is set is 3.3V. When the output current is 300 mA, the efficiency is about 40% (see FIG. 5). On the other hand, in the copying machine 1 of the present embodiment, when the first capacitor C1 (capacity 700F) that can hold power for one hour or more when mounted in the energy saving mode is charged, the first capacitor C1 is charged. Takes about 4 minutes at a charge current of 5A. In this case, if the load current of the first capacitor C1 is 5A, the copy machine 1 can ensure an efficiency of 75% or more.

In addition, this invention is not limited to embodiment mentioned above, It can implement with a various form.
The copier 1 of the present embodiment is a color copier, but is not limited to this form and may be a monochrome copier.
In the copying machine 1 of the present embodiment, the toner image is transferred to the paper T via the intermediate transfer belt 48 (indirect transfer method). However, the present invention is not limited to this form, and is formed on the photosensitive drum. The transferred toner image may be directly transferred to the paper T (direct transfer method).
The copier 1 of the present embodiment is configured to print one side of the paper T, but is not limited to this, and may be configured to print both sides of the paper.
Further, the image forming medium on which the toner image is fixed by the copying machine is not limited to the paper T, and may be a film sheet such as an OHP (overhead projector) sheet.

  The electronic apparatus of the present invention is not limited to the above-described copying machine 1. In other words, the electronic device of the present invention may be a multi-function device having a copy function, a facsimile function, a printer function, and a scanner function, or may be a printer.

DESCRIPTION OF SYMBOLS 1 ... Copy machine (image forming apparatus), 90 ... Control part, 91 ... Sleep CPU, 101 ... AC / DC converter (converter), 102 ... 1st switch, 103 ... 2nd switch, 111 ... Main body switch (3rd switch) ), C1... First capacitor (charge storage unit)

Claims (3)

A converter that converts AC voltage to DC voltage;
A charge storage unit electrically connected to the converter and capable of storing or discharging charges;
A control unit electrically connected to the converter and the charge storage unit;
A first electrical connection is made between the converter and the charge storage unit, and the converter and the charge storage unit are electrically connected or disconnected based on the control of the control unit. A switch,
When the DC voltage is output from the converter and electrically connected between the charge storage unit and the control unit, the charge storage unit and the control unit are electrically connected, and the DC voltage is output from the converter. A second switch that electrically disconnects the charge storage unit and the control unit when the signal is not output;
Electronic equipment comprising. The electronic device according to claim 1, wherein a third switch capable of blocking an AC voltage from being input to the converter is electrically connected to an input side of the converter. When the control unit controls the first switch to be disconnected in order to reduce power consumption, a result of detecting a voltage value of a DC voltage input to the control unit is a predetermined voltage value. The electronic device according to claim 1, wherein the electronic device is controlled so as to be electrically connected to the first switch when the value is less than the value.

Images