JP6566259B2 - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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JP6566259B2
JP6566259B2 JP2015208435A JP2015208435A JP6566259B2 JP 6566259 B2 JP6566259 B2 JP 6566259B2 JP 2015208435 A JP2015208435 A JP 2015208435A JP 2015208435 A JP2015208435 A JP 2015208435A JP 6566259 B2 JP6566259 B2 JP 6566259B2
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unit
power supply
option
current
circuit
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JP2017085683A (en
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貞博 松浦
貞博 松浦
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京セラドキュメントソリューションズ株式会社
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Description

  The present invention relates to an image forming apparatus.

  A certain power supply device has a current detection circuit and a cutoff circuit for each option machine. If the current value detected by the current detection circuit for a certain option machine exceeds the rated value, the cutoff circuit for that option machine The power supply to the option machine is cut off (see, for example, Patent Document 1).

  FIG. 4 is a block diagram illustrating an example of an image forming apparatus.

  In the image forming apparatus shown in FIG. 4, option units 102-i (i = 1,..., N) are connected to the main unit 101, and the main power unit 111 of the main unit 101 is connected to a commercial power source. AC power is converted into DC power, and the DC power is supplied to the main body drive unit 112 of the main unit 101 and the option drive unit 131 of each option unit 102-i. The main body driving unit 112 is a load in the main body unit 101, and the option driving unit 131 is a load in each option unit 102-i.

  Each option unit 102-i is provided with an overcurrent detection circuit 132 and a cutoff circuit 133, and the current supplied to the option drive unit 131 by the overcurrent detection circuit 132 is the rating of the option unit 102-i. Is detected, the current to the option drive unit 131 is cut off by the cut-off circuit 133.

  Further, the main power supply device 111 is provided with an overcurrent detection circuit 121. The overcurrent detection circuit 121 stops the output of the current from the main power supply device 111 when the current output to the main unit 101 and all the option units 102-1 to 102-N exceeds a predetermined value.

JP-A-10-75523

  A switching power supply device mounted on information technology equipment such as an image forming apparatus needs to comply with finite power supply regulations.

  In the case of the image forming apparatus as described above, even if the overcurrent detection circuit 121 of the main power supply device 111 does not detect the overcurrent, the current supplied to the option unit 102-i sets the rating of the option unit 102-i. There is a possibility of exceeding. Therefore, in order to adapt the image forming apparatus to the finite power supply regulation, it is necessary to provide an overcurrent detection circuit 132 and a cutoff circuit 133 in each option unit 102-i as shown in FIG.

  However, when the overcurrent detection circuit 132 and the cutoff circuit 133 are provided in each option unit 102-i, the device cost increases.

  The present invention has been made in view of the above problems, and an object thereof is to obtain an image forming apparatus that conforms to the finite power supply regulation without providing a cutoff circuit in an option unit.

An image forming apparatus according to the present invention includes a main unit, one or a plurality of optional units connected to the main unit at the time of factory shipment or after sales, and a controller. The main unit includes a main power supply device. Said main power supply, that the power output unit that outputs the output current of the main power supply including a power supply current of said one or more optional units, the output current before Symbol main power device exceeds a predetermined first value An overcurrent detection circuit for detecting the output current, and when the overcurrent detection circuit detects that the output current of the main power supply device exceeds the predetermined first value, outputs the output current from the power output unit. And a control unit for stopping. Each of the one or more option units includes an individual overcurrent detection circuit that detects that the supply current to the option unit exceeds a predetermined second value. The individual overcurrent detection circuit transmits a detection signal to the main power supply device when detecting that the supply current to the option unit exceeds the predetermined second value. The one or more option units do not include a cutoff circuit that cuts off the supply current in accordance with the detection signal. When the detection signal from any one of the one or more option units is detected in the main power supply device, the control unit of the main power supply device outputs the output current from the power output unit. The output of is stopped. The controller identifies an option unit in which an overcurrent has occurred based on the detection signal from the individual overcurrent detection circuit, and prohibits the use of the identified option unit. Furthermore, when there are a plurality of option units, the predetermined second values of at least two of the option units are different from each other.

  According to the present invention, it is possible to obtain an image forming apparatus that conforms to the finite power supply regulation without providing a cutoff circuit in the option unit.

  These and other objects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

FIG. 1 is a block diagram showing a configuration of an image forming apparatus according to an embodiment of the present invention. FIG. 2 is a circuit diagram showing a configuration of overcurrent detection circuit 32 of option unit 2-i in FIG. FIG. 3 is a circuit diagram showing a configuration of main power supply device 11 in FIG. FIG. 4 is a block diagram illustrating an example of an image forming apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of an image forming apparatus according to an embodiment of the present invention. The image forming apparatus shown in FIG. 1 includes a main body unit 1 and one or a plurality of option units 2-1 to 2-N (N ≧ 1).

  The main unit 1 includes a main power supply device 11 and a main body drive unit 12. The main power supply 11 is supplied with power from a commercial power supply and outputs a power supply current to the main body drive unit 12 and one or a plurality of option units 2-1 to 2-N. The main body drive unit 12 includes internal devices such as a printing device, an image reading device, and an operation panel, and a control circuit for controlling the internal devices.

  The option unit 2-i is electrically and mechanically connected to the main unit 1 at the time of factory shipment or after sale. The option units 2-1 to 2-N feed a document to be scanned and supply the original of the main unit 1. Automatic document feeder that transports to the image reading device, finisher unit that performs post-processing (sorting, stapling, etc.) on the printed matter after printing processing of the printing device, and printing device of the main unit 1 that feeds printing paper At least one of the paper feeding units to be conveyed to

  The main power supply device 11 in the main body unit 1 includes a power output unit 21, an overcurrent detection circuit 22, and a control unit 23. The power output unit 21 outputs a power supply current. The overcurrent detection circuit 22 detects that the output current of the main power supply device 11 has exceeded a predetermined value. The control unit 23 is a control circuit such as a control IC (Integrated Circuit) that controls the power output unit 21, and the overcurrent detection circuit 22 detects that the output current of the main power supply device 11 exceeds a predetermined value. In the case, the output of the power supply current from the power output unit 21 is stopped.

  On the other hand, each option unit 2-i includes an option drive unit 31 and an overcurrent detection circuit 32.

  The option drive unit 31 includes an internal device for the function of the option unit 2-i and a control circuit for controlling the internal device. The overcurrent detection circuit 32 detects that the supply current to the option unit 2-i has exceeded a predetermined value (for example, the rated current of the option unit 2-i).

  The overcurrent detection circuit 32 transmits a predetermined detection signal to the main power supply device 11 of the main unit 1 when detecting that the supply current to the option unit 2-i exceeds a predetermined value.

  Each option unit 2-i does not include a cutoff circuit that cuts off the supply current in accordance with the above-described detection signal.

  When the main power supply device 11 detects a predetermined detection signal from any of the option units 2-i of the option units 2-1 to 2-N, the control unit 23 of the main power supply device 11 The output of the power supply current from 21 is stopped.

  FIG. 2 is a circuit diagram showing a configuration of overcurrent detection circuit 32 of option unit 2-i in FIG.

  The overcurrent detection circuit 32 includes a current detection resistor Rs, a differential amplifier circuit 41, a reference voltage circuit 42, and a comparator 43. The current detection resistor Rs is inserted in the power line to the option drive unit 31. The differential amplifier circuit 41 includes resistors Rc to Re and an operational amplifier, and a difference between the potential at one end of the current detection resistor Rs and the potential at the other end of the current detection resistor Rs (that is, the voltage across the current detection resistor Rs). Is amplified at a predetermined amplification factor. The reference voltage circuit 42 is a voltage dividing circuit using resistors Ra and Rb, and generates a reference voltage Vref from the power supply voltage of the power line. The comparator 43 compares the output voltage of the differential amplifier circuit 41 and the output voltage of the reference voltage circuit 42. When one of the two is larger than the other, the output voltage is set to the high level, and one of the two is smaller than the other. The above-mentioned detection signal is generated by setting the output voltage to a low level. The reference voltage Vref is set to a value obtained by Iref × R × A based on the above-described upper limit value Iref of the supply current, the resistance value R of the current detection resistor Rs, and the amplification factor A of the differential amplifier circuit 41. Is done.

  Here, the detection signal indicates a high level when the supply current to the option unit 2-i exceeds a predetermined value and indicates a low level when the supply current to the option unit 2-i does not exceed the predetermined value. It is a binary signal indicating a level.

  Further, a synthesizing circuit that synthesizes detection signals transmitted from the overcurrent detection circuits 32 of the plurality of option units 2-i is provided in the main unit 1. Here, an OR circuit OR is provided as the synthesis circuit. The OR circuit OR calculates the logical sum of the detection signals of the plurality of option units 2-i and outputs the calculation result to the main power supply device 11 as a combined detection signal. When the main power supply device 11 detects that the value of the combined detection signal is at a high level, the control unit 23 of the main power supply device 11 stops the output of the power supply current from the power output unit 23.

  FIG. 3 is a circuit diagram showing a configuration of main power supply device 11 in FIG. A main power supply device 11 shown in FIG. 3 is a switching power supply circuit, and rectifies and smoothes AC power obtained from a commercial power supply by a diode bridge DB and a capacitor C1, and converts the DC power after rectification and smoothing into a DC / DC converter portion. Step down to a rated voltage (eg, 24 volts) and output.

  In the DC / DC converter portion, one end of the diode bridge DB and the capacitor C1 is connected to one end of the primary side winding of the transformer TR, and one switch of the switching element Q1 is connected to the other end of the primary side winding of the transformer TR. The terminal for use (here, drain) is connected. Note that an N-channel FET (Field Effect Transistor) is used for the switching element Q1. Further, the primary winding of the transformer TR is provided with a snubber circuit including a resistor R11, a diode D1, and a capacitor C11.

  On the secondary side of the transformer TR, a rectifying / smoothing circuit using a diode D2 and a capacitor C2 is provided.

  The control unit 23 supplies a control signal to the control terminal of the switching element Q1 via the resistor R14, and controls the switching element Q1 on and off. The comparison circuit 24 detects the secondary side voltage (that is, output voltage) after the rectification and smoothing, compares it with the reference voltage, and notifies the control unit 23 of the comparison result. The control unit 23 adjusts the duty so that the secondary side voltage becomes the reference voltage and controls the switching element Q1 on and off. Further, a rectifier circuit 25 is connected to another winding of the transformer TR, and the rectifier / smoothing circuit 25 is connected to the control unit 23 as a power source.

  Further, one end of the current detection resistor R12 is connected to the other switch terminal (here, the source) of the switching element Q1, and the other end of the current detection resistor R12 is connected to the other end of the diode bridge DB and the capacitor C1. It is connected. A high cut filter for protection by the resistor R13 and the capacitor C13 is connected to the current detection resistor R12, and the output voltage of the high cut filter is detected by the control unit 23. The control unit 23 detects the detected output voltage. When a reference voltage value corresponding to a predetermined current value of the output current on the secondary side is exceeded, the switching element Q1 is turned off and stopped. The current detection resistor R12 is provided with a protective Zener diode ZD.

  Further, a series circuit of a switching element Q2, a protective resistor R2, and a light emitting side element of the photocoupler PC1 is connected to the output side of the secondary side rectifying and smoothing circuit of the transformer TR. The switching element Q2 performs an on / off operation according to the voltage level of the signal line (here, the voltage level of the combined detection signal).

  The series circuit of the light receiving side element of the photocoupler PC1 and the protective resistor R15 is connected to the overcurrent detection terminal (that is, the connection position of the above-described high cut filter) of the control unit 23, and the signal line The voltage level is transmitted to the primary side, and a voltage corresponding to the voltage level of the signal line (here, the voltage level of the combined detection signal) is applied to the overcurrent detection terminal. The photocoupler PC1 includes a light emitting side element and a light receiving side element, and the light emitting side element and the light receiving side element are optically coupled.

  When one of the detection signals of the option unit 2-i becomes high level, the combined detection signal becomes high level, the light receiving side element of the photocoupler PC1 is turned on, and the voltage of the overcurrent detection terminal is changed to the secondary voltage described above. The reference voltage value for overcurrent detection of the side output current is exceeded. Therefore, when an overcurrent is detected in any of the option units 2-i, the control unit 23 stops the operation of the switching element Q1 as in the case where the secondary output current becomes an overcurrent. Operate.

  The primary side winding and secondary side winding of the transformer TR, the snubber circuit, the switching element Q1, the secondary side rectifying and smoothing circuit, and the like correspond to the power output unit 21. Further, the current detection resistor R12, the photocoupler PC1, the switching element Q2, and the like correspond to the overcurrent detection circuit 22.

That is, since the control unit 23 is insulated from the secondary side of the transformer TR by the transformer TR, the light emitting side element of the photocoupler PC1 is in accordance with the level of the composite detection signal with the secondary side power of the transformer TR. When the control unit 23 detects that the value of the combined detection signal obtained from the light receiving side element of the photocoupler PC1 is at a high level, the control unit 23 stops the output of the power source current from the power output unit 21.

  Next, the operation of the image forming apparatus will be described.

  In the image forming apparatus shown in FIGS. 1 to 3, the rated current is determined for each of the plurality of option units 2-1 to 2-N. When an overcurrent occurs in any of the option units 2-i, the overcurrent detection circuit 32 in the option unit 2-i detects the overcurrent and sets the detection signal to a high level. The detection signal is supplied from the OR circuit OR to the main power supply device 11 as a combined detection signal.

  In the main power supply device 11, when the composite detection signal becomes high level, the control unit 23 detects the overcurrent and stops the operation of the switching element Q1 of the power output unit 21 as described above. Thereby, the power supply from the main power supply device 11 to the plurality of option units 2-1 to 2-N is stopped.

  For example, the rated output voltage of the main power supply 11 is 24 volts, the rated current of the main body drive circuit 12 is 6 amperes, the rated current of the option unit 2-1 that is an automatic document feeder is 2 amperes, and the finisher When the rated current of the option unit 2-2 that is a unit is 3 amperes and the rated current of the option unit 2-3 that is a paper feeding unit is 3 amperes, the rated current of the main power supply device 11 is 14 amperes. If the current value at which the output current is detected as an overcurrent in such a main power supply device 11 is set to 16 amperes, the device as a whole does not meet the finite power supply regulation (apparent power should be 240 VA or less). It is necessary to individually limit the current for the unit 2-i. For this reason, when an overcurrent is detected in any of the option units 2-i (i = 1, 2, 3), as described above, the power supply is stopped by the main power supply device 11 of the main unit 1. Perform current limit.

  As described above, according to the above embodiment, the main power supply device 11 includes the power output unit 21 that outputs the power supply current and the overcurrent detection that detects that the output current of the main power supply device 11 exceeds the predetermined value. The circuit 22 and a control unit 23 that stops the output of the power supply current from the power output unit 21 when the overcurrent detection circuit 22 detects that the output current of the main power supply device 11 exceeds a predetermined value. Each of the one or more option units 2-i includes an overcurrent detection circuit 32 that detects that the supply current to the option unit 2-i exceeds a predetermined value. When the overcurrent detection circuit 32 detects that the supply current to the option unit 2-i exceeds a predetermined value, the overcurrent detection circuit 32 transmits a predetermined detection signal to the main power supply device 11 and controls the control unit 23 of the main power supply device 11. When the main power supply device 11 detects a predetermined detection signal from any one of the one or more option units 2-i, the power output unit 21 outputs the power source current. Stop.

  As a result, the image forming apparatus conforms to the finite power supply regulation without providing a cutoff circuit in the option unit 2-i.

  Various changes and modifications to the above-described embodiment will be apparent to those skilled in the art. Such changes and modifications may be made without departing from the spirit and scope of the subject matter and without diminishing its intended advantages. That is, such changes and modifications are intended to be included within the scope of the claims.

  For example, in the above embodiment, the detection signals output from the plurality of option units 2-1 to 2-N are separately supplied to a controller such as a CPU (Central Processing Unit), and the controller uses the detection signals based on the detection signals. The option unit 2-i in which the current is generated may be specified, and use of the specified option unit 2-i may be prohibited.

  In the above-described embodiment, a large-capacity switching element is provided on the secondary side of the transformer TR, and the switching element is controlled based on the composite detection signal, and an overcurrent is detected by any of the option units 2-i. In such a case, the secondary side of the transformer TR is short-circuited by the switching element, the output current of the main power supply device 11 is forcibly overcurrent, and the control unit 23 detects the overcurrent on the primary side. The power output unit 21 may be stopped. In this case, the resistor R15, the photocoupler PC1, the switching element Q2, and the resistor R2 are not particularly necessary.

  The present invention is applicable to, for example, an image forming apparatus to which an option unit can be attached.

2-1 to 2-N Option unit 11 Main power supply device 21 Power output unit 22 Overcurrent detection circuit 23 Control unit 32 Overcurrent detection circuit (an example of an individual overcurrent detection circuit)
OR OR circuit (example of synthesis circuit)
PC1 photo coupler

Claims (4)

  1. The main unit,
    One or more optional units connected to the main unit at the time of factory shipment or after sales;
    With a controller,
    The main unit includes a main power supply device,
    Said main power supply, that the power output unit that outputs the output current of the main power supply including a power supply current of said one or more optional units, the output current before Symbol main power device exceeds a predetermined first value An overcurrent detection circuit for detecting the output current, and when the overcurrent detection circuit detects that the output current of the main power supply device exceeds the predetermined first value, outputs the output current from the power output unit. A control unit for stopping,
    Each of the one or more option units includes an individual overcurrent detection circuit that detects that a supply current to the option unit exceeds a predetermined second value,
    The individual overcurrent detection circuit, when detecting that the supply current to the option unit exceeds the predetermined second value, transmits a detection signal to the main power supply device,
    Each of the one or more option units does not include a cutoff circuit that cuts off the supply current according to the detection signal,
    When the detection signal from any one of the one or more option units is detected in the main power supply device, the control unit of the main power supply device outputs the output current from the power output unit. The output of
    The controller specifies an option unit in which an overcurrent has occurred based on the detection signal from the individual overcurrent detection circuit , and prohibits the use of the specified option unit ,
    When there are a plurality of the optional units, the predetermined second values of at least two of the optional units are different from each other;
    An image forming apparatus.
  2. A synthesis circuit for synthesizing the detection signals transmitted from the individual overcurrent detection circuits of the plurality of option units;
    The detection signal indicates a high level when the supply current to the option unit exceeds the predetermined second value, and indicates a low level when the supply current to the option unit does not exceed the predetermined second value. A binary signal indicating
    The combining circuit calculates a logical sum of the detection signals transmitted from the individual overcurrent detection circuits of the plurality of option units, and transmits a combined detection signal indicating the logical sum;
    The control unit of the main power supply device stops outputting the output current from the power output unit when it is detected that the value of the combined detection signal is high level in the main power supply device;
    The image forming apparatus according to claim 1.
  3. Further comprising a photocoupler comprising a light emitting side element and a light receiving side element, wherein the light emitting side element and the light receiving side element are optically coupled,
    The main power supply device is a switching power supply circuit,
    The power output unit includes a transformer, a switching element connected to the primary side of the transformer, and a rectifying and smoothing circuit connected to the secondary side of the transformer and outputting the output current ,
    The control unit is insulated from the secondary side of the transformer by the transformer,
    The light emitting side element of the photocoupler is driven according to the level of the combined detection signal with the secondary power of the transformer,
    The control unit, when detecting that the value of the combined detection signal obtained from the light receiving side element of the photocoupler is high level, stops the output of the output current from the power output unit,
    The image forming apparatus according to claim 2.
  4.   4. The image forming apparatus according to claim 1, wherein the plurality of option units includes at least one of an automatic document feeder, a finisher unit, and a paper feed unit. 5.
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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2637856B2 (en) * 1991-04-23 1997-08-06 株式会社日立製作所 Personal computer
JP3098432B2 (en) * 1996-10-21 2000-10-16 群馬日本電気株式会社 Power supply circuit
JP4378195B2 (en) * 2004-03-12 2009-12-02 株式会社リコー Image forming apparatus

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