JP2008029057A - Power supply device, image forming apparatus, control method of power supply device, control method of image forming apparatus, program and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply device in which the contact of a relay switch for supplying power to a load is prevented from deteriorating or melting when an interlock switch is opened/closed, and to provide an image forming apparatus, a control method of the power supply device, a control method of the image forming apparatus, a program and a recording medium. <P>SOLUTION: A relay 5 and a FET 6 perform switching operation based on power supplied through an interlock switch 9. Upon receiving an open instruction signal from the interlock switch 9, a control section 13 controls to open the relay 5 after the FET 6 is opened. Upon receiving a close instruction signal from the interlock switch 9, the control section 13 controls to supply power to the FET 6 after power is supplied to the relay 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device used in a copying machine, a printer, a facsimile, or the like provided with a power supply device that supplies power to a load, an image forming apparatus, a control method for the power supply device, a control method for the image forming device, a program, and a recording medium. .

  Conventionally, when an open / close mechanism such as a door provided to protect the inside of the device is opened to expose the drive unit inside the device, there is a danger that the user will come into contact with the drive unit and fingers will be pinched An opening / closing mechanism called an interlock mechanism is provided to prevent the occurrence of the above.

  This interlock mechanism is configured such that when the projection provided on the door of the device and the mechanical switch provided on the device main body are pressed by this projection (when the door is opened), the switch is closed and When it is released (the door is opened), the switch is opened. This mechanical switch provided on a power supply line for supplying power to the drive unit cuts off the power supply and stops the drive unit by stopping the power supply to the drive unit.

  This mechanical switch opens and closes to supply power to the drive unit. However, because a large current is cut off and a large current is applied, the drive unit is damaged or the contact of the drive unit is deteriorated, resulting in many poor connections. appear. In particular, an inrush current flows when the load is an inductive load. When this inrush current is connected or cut off via a relay, an arc is generated, and contact welding or deterioration occurs.

  In order to solve such problems and problems, inventions described in Patent Documents 1 and 2 are disclosed as conventional techniques related to a power supply apparatus and an image forming apparatus. In Patent Document 1, a DC power source, a semiconductor switch, a relay, and a load are connected in series. The ON of the semiconductor switch is delayed from the ON of the relay, and the semiconductor switch is turned ON after the relay is connected. The technique which prevents that the contact of a relay welds by this is disclosed.

Patent Document 2 discloses a relay that opens and closes upon receiving power supply from an interlock switch, a constant voltage element that is connected in series to the relay and cuts off current when the voltage is lower than a set voltage, and the constant voltage. A configuration of a semiconductor element that supplies power to a load by energizing the element is disclosed. In this configuration, when the interlock switch is opened and the voltage is reduced, the semiconductor element is turned off and then the relay is turned off.
Japanese Patent Laid-Open No. 2000-215782 Japanese Patent Laid-Open No. 2002-247752

  However, in Patent Document 1 described above, when the interlock switch is opened, that is, when the door is opened, the semiconductor switch is opened after the relay is opened. Therefore, an arc is generated when the relay is opened, and there is a possibility that the contact is deteriorated or, in the worst case, the contact is welded.

  In Patent Document 2, when the interlock switch is opened, the semiconductor switch is opened and then the relay is opened. Therefore, no arc is generated when the relay is opened. Therefore, the contact is not deteriorated.

  However, when the interlock switch is closed, the relay is closed after the semiconductor switch is closed first. Therefore, an arc is generated when the relay is closed, and the contact may be deteriorated or, in the worst case, the contact may be welded.

  The present invention has been made in view of the above-mentioned problems of the prior art. After the interlock switch is opened, the semiconductor switch is opened and then the relay switch is opened. When the interlock switch is closed, the relay switch is closed. It is an object of the present invention to provide a power feeding device, an image forming device, a power feeding device control method, an image forming device control method, a program, and a recording medium that close a semiconductor switch.

  In order to achieve the above object, the invention according to claim 1 is directed to a semiconductor switching means and a relay switching means connected in series for performing an opening / closing operation of electric power supplied to a load, and supply of electric power as the object moves. An interlock switch for performing the opening / closing operation of the semiconductor, a semiconductor opening / closing control means for controlling the opening / closing operation relating to the power supply of the semiconductor opening / closing means, and the relay opening / closing means and the semiconductor opening / closing based on the opening / closing signal accompanying the opening / closing operation from the interlock switch An open / close operation control means for controlling the control means, the relay open / close means and the semiconductor open / close control means perform an open / close operation based on electric power supplied via the interlock switch, and the open / close operation control means Power is supplied to the relay opening / closing means based on the closing instruction signal from the lock switch, and the power is supplied to the semiconductor opening / closing means after a predetermined time has elapsed. Characterized in that it is a power supply device which controls to supply.

  According to a second aspect of the present invention, in the power feeding device according to the first aspect of the present invention, the power supply device further includes a first power storage unit that accumulates electric power supplied via the interlock switch and supplies the electric power to the relay opening / closing unit. Features.

  According to a third aspect of the present invention, in the power feeding device according to the second aspect, the power supplied to the first power storage unit via the interlock switch is on a power supply line between the interlock switch and the first power storage unit. The first power storage means is supplied through a unidirectional semiconductor element provided in the first storage device.

  According to a fourth aspect of the present invention, in the power feeding device according to any one of the first to third aspects, the semiconductor opening / closing control means operates to open / close the semiconductor opening / closing means based on the power supplied via the interlock switch. It is characterized by controlling.

  According to a fifth aspect of the present invention, in the power feeding device according to any one of the first to fourth aspects, the control unit further includes an interrupt terminal, and an open / close signal from the interlock switch is input to the interrupt terminal. It is characterized by that.

  According to a sixth aspect of the present invention, there is provided an image forming apparatus comprising the power feeding device according to any one of the first to fifth aspects, wherein the original image transferred onto the transfer paper is heated and fixed at the time of image formation. A load having heating means and supplied with electric power is a heating means.

  According to a seventh aspect of the present invention, in the image forming apparatus according to the sixth aspect of the present invention, the image forming apparatus further includes a chargeable / dischargeable second power storage unit that supplies power to the heating unit.

  According to an eighth aspect of the present invention, there is provided the image forming apparatus according to the sixth or seventh aspect, wherein the detecting unit detects an open / close signal of an interlock switch that performs an open / close operation of power supply in accordance with the movement of the object, and a heating unit. A timer that measures the time from when the power supply is started to when the interlock switch is opened, and when the time measured by the timer is shorter than a predetermined time set in advance The opening operation of the semiconductor opening / closing means for supplying electric power to the heating means is opened after a predetermined time has elapsed.

  According to the ninth aspect of the present invention, there is provided a semiconductor opening / closing control step for controlling an opening / closing operation related to power supply of the semiconductor opening / closing means connected in series for performing an opening / closing operation of the electric power supplied to the load, and an electric power associated with the movement of the object. An opening / closing operation control step for controlling the relay opening / closing means and the semiconductor opening / closing means based on an opening / closing signal accompanying the opening / closing operation from an interlock switch that performs the opening / closing operation of The opening / closing operation control step controls the opening / closing operation of the relay opening / closing means and the semiconductor opening / closing means based on the power supplied via the interlock switch, and the power to the relay opening / closing means based on the closing instruction signal from the interlock switch. And controlling to supply power to the semiconductor switching means after a predetermined time has elapsed.

  According to a tenth aspect of the present invention, in the method for controlling a power feeding device according to the ninth aspect, the method includes a first power storage step of accumulating electric power supplied via the interlock switch and supplying the electric power to the relay switch. It is characterized by that.

  According to an eleventh aspect of the present invention, in the method for controlling a power feeding apparatus according to the tenth aspect, the electric power supplied in the first power storage process via the interlock switch is a unidirectional semiconductor element from the interlock switch. It is characterized by being charged via

  According to a twelfth aspect of the present invention, in the method for controlling a power feeding device according to any one of the ninth to eleventh aspects, the switching operation control step is based on electric power supplied via an interlock switch. It is characterized by controlling the opening and closing operation.

  A thirteenth aspect of the present invention is the method of controlling a power feeding device according to any one of the ninth to twelfth aspects, further comprising an interrupting step in which an open / close signal from the interlock switch is input to the interrupt terminal. And

  According to a fourteenth aspect of the present invention, there is provided a method for controlling an image forming apparatus including the power feeding device according to any one of the ninth to thirteenth aspects, wherein a document image transferred onto a transfer sheet is heated during image formation. And a heating process for fixing, and electric power is supplied during the heating process.

  According to a fifteenth aspect of the present invention, in the control method for an image forming apparatus according to the fourteenth aspect, the image forming apparatus further includes a chargeable / dischargeable second power storage step for supplying electric power in the heating step.

  According to a sixteenth aspect of the present invention, in the control method for an image forming apparatus according to the fourteenth or fifteenth aspect, a detection step of detecting an open / close signal of an interlock switch that performs an open / close operation of power supply in accordance with the movement of an object; A measurement process for measuring the time from when the power supply to the heating process is started to when the interlock switch is opened, and when the measured time is shorter than a predetermined time set in advance Is characterized in that the opening operation of the semiconductor opening and closing step for supplying electric power to the heating step is opened after a predetermined time has elapsed.

  According to the seventeenth aspect of the present invention, there is provided a semiconductor opening / closing control process for controlling an opening / closing operation related to the power supply of the semiconductor opening / closing means connected in series to perform an opening / closing operation of the electric power supplied to the load; A program for causing a computer to execute an opening / closing operation control process for controlling a relay opening / closing means and a semiconductor opening / closing means based on an opening / closing signal accompanying an opening / closing operation from an interlock switch for performing an opening / closing operation of The control process controls the opening / closing operation of the relay opening / closing means and the semiconductor opening / closing means based on the electric power supplied via the interlock switch, and supplies the relay opening / closing means based on the closing instruction signal from the interlock switch. And having the computer execute control to supply power to the semiconductor switching means after a certain period of time. To.

  According to an eighteenth aspect of the present invention, in the program according to the seventeenth aspect, the computer stores the electric power supplied via the interlock switch and causes the computer to execute a first power storage process for supplying the electric power to the relay opening / closing means. It is characterized by that.

  According to a nineteenth aspect of the present invention, in the program according to the eighteenth aspect, the power supplied in the first power storage process via the interlock switch is stored from the interlock switch via the unidirectional semiconductor element. It is characterized by causing a computer to execute.

  According to a twentieth aspect of the present invention, in the program according to any one of the seventeenth to nineteenth aspects, the control processing controls the opening / closing operation of the semiconductor opening / closing means based on the electric power supplied via the interlock switch. It is characterized by having a computer execute.

  According to a twenty-first aspect of the invention, in the program according to any one of the seventeenth to twentieth aspects, the computer further executes an interrupt process in which an open / close signal from an interlock switch is input to an interrupt terminal. To do.

  According to a twenty-second aspect of the present invention, there is provided a detection process for detecting an open / close signal of an interlock switch that performs an open / close operation for supplying power in accordance with the movement of an object, and a document transferred onto a transfer sheet during image formation by the image forming apparatus. From the heat treatment for heating and fixing the image, the second power storage process for supplying power from the chargeable / dischargeable power storage unit during the heat treatment, and the time when the power supply from the power storage unit was started during the heat treatment, A semiconductor opening / closing operation that supplies power from the power storage unit when the computer executes a measurement process for measuring the time until the lock switch is opened and the measured time is shorter than a predetermined time. It is a program for causing a computer to execute an opening operation of means after a predetermined time has elapsed.

  A twenty-third aspect of the present invention is a computer-readable recording medium on which the program according to any one of the seventeenth to twenty-second aspects is recorded.

  Thus, according to the power supply device, image forming apparatus, power supply device control method, image forming apparatus control method, program, and recording medium of the present invention, when the interlock switch is opened, the relay switch is opened after the semiconductor switch is opened. When the interlock switch is closed and the relay switch is closed, the semiconductor switch is closed after the relay switch is closed, so that the contact of the relay switch can be prevented from being deteriorated or welded.

Hereinafter, a power supply apparatus, an image forming apparatus, a method for controlling the power supply apparatus, a method for controlling the image forming apparatus, a program, and a recording medium according to the present embodiment will be described in detail with reference to the drawings. In addition, this embodiment is not limited to what is described below, A various change is possible in the range which does not deviate from the meaning.
FIG. 1 is a diagram schematically illustrating a power supply device according to the present embodiment.

  As shown in FIG. 1, the power supply device of this embodiment includes a fixing heater 2, a relay 5, a semiconductor (FET) 6, an FET open / close circuit 7, a relay drive circuit 8, an interlock switch 9, and an open switch. A collector buffer 10, a voltage conversion buffer 11, a control unit 13, a power supply unit 17, a temperature overheating prevention unit 21, and a fixing overheating unit temperature detection circuit 28 are provided. The overheat prevention unit 21 includes a relay 3 and a thermostat 4.

  As a configuration for supplying electric power to the load, the fixing heater 2 is connected to the power supply device 17, and the electric power is supplied to the fixing heater 2 via the relay 3 in the overtemperature prevention unit 21 in which the relay 3 is opened when the thermostat 4 is shut off. Is connected in series with the FET 5.

Next, a specific operation will be described.
The relay 5 and the FET 6 are controlled to be opened and closed by power supply from the control unit 13 of the image forming apparatus that supplies power to the fixing heater 2 and the interlock switch 9 provided separately from the control unit 13.

In a state where a signal for turning on the relay 5 is output via the port 2 of the control unit 13 of the image forming apparatus and a signal for turning on the FET 6 is output from the port 3 of the control unit 13 to the FET control circuit 7. When the interlock switch 9 is closed, power is supplied to the relay 5 from the interlock switch 9, so that the exciting coil is energized and the open / close circuit of the relay 5 is closed.
On the other hand, since power is also supplied to the FET control circuit 7 from the interlock switch 9, when the transistor 7a of the FET control circuit 7 is turned on, an ON voltage is also applied to the gate of the FET 6, and the FET 6 is also turned on.

  When the interlock switch 9 is opened, no power is supplied to the relay 5, so the open / close circuit of the relay 5 is opened and no power is supplied to the FET control circuit 7 from the interlock switch 9. 7 transistor 7a is turned off, an OFF voltage is applied to the gate of FET 6, and FET 6 is also turned off. The semiconductor FET 6 is turned on earlier than the mechanical contact relay 5.

Here, the operation of the overheat prevention unit 21 will be briefly described. As described above, the overheat prevention unit 21 includes the relay 3 and the thermostat 4.
The thermostat 4 is provided in the fixing device of the image forming apparatus according to the present embodiment described later with reference to FIG. When the relay 5 and the FET 6 continue to conduct, and the temperature reaches a temperature at which the fixing roller 81 of the fixing device 80 is melted, the thermostat 4 is cut off. Since the exciting coil of the relay 3 is energized via the thermostat 4, the energization is interrupted, the relay 3 is opened, and the power supply to the fixing heater 2 is also interrupted.

  The fixing overheat portion temperature detection circuit 28 for detecting the temperature of the fixing roller 2 will be described in detail later with reference to FIG.

  Here, the operation of the power supply apparatus of the present embodiment will be described. FIG. 2 is a timing chart illustrating the operation of the power supply apparatus according to the present embodiment.

  When the interlock switch 9 is opened, the FET 6 is turned off as described above. Since the relay 5 is a mechanical contact, it is turned off with a little delay. Here, since the FET 6 is turned off first, no overcurrent flows through the contact of the relay 5. An opening signal of the interlock switch 9 is input to the port 1 of the control unit 13 via the voltage conversion buffer 11. Therefore, a signal for turning off the FET 6 is output from the port 3 of the control unit 13, and a signal for turning off the relay 5 is output from the port 2 of the control unit 13. Since relay 5 and FET 6 are already OFF, there is no change in state.

  Next, the control unit 13 monitors the closed signal of the interlock switch 9. When a signal indicating that the interlock switch 9 is closed is input from the port 1 of the control unit 13, a signal for turning on the relay 5 is output from the port 2 of the control unit 13. Then, after a time considering the chattering time of the relay contact has elapsed, a signal for turning on the FET 6 is output from the port 3 of the control unit 13. Since the FET 6 is turned on after the contact of the relay 5 is connected, a large current does not flow when the contact of the relay 5 is turned on.

  When the interlock switch 9 is closed when the FET 6 and the relay 5 are not turned off in terms of software, the semiconductor FET 6 is turned on first, and then the mechanical switch relay 5 is turned on. Overcurrent flows through the contact point, and the contact may be welded or deteriorated. Even if the interlock switch 9 is closed, if it is not necessary to supply power to the fixing heating unit, the signal for turning on the FET 6 is of course not output.

  Thus, according to this embodiment, when the interlock switch 9 is opened, the FET 6 is opened first, and then the relay 5 is opened. When the interlock switch 9 is closed, the FET 6 is closed after the relay 5 is closed. By adopting such a configuration, it is possible to prevent the relay contact from being deteriorated and welded.

FIG. 3 is a diagram illustrating another example of the power feeding device according to the present embodiment.
In FIG. 2, stored power is supplied to the relay 5 when the interlock switch 9 is opened in order to intentionally delay the opening of the relay 5 relative to the opening operation of the FET 6. In the case of a small relay with a small current capacity of the relay, the contact is opened and closed quickly, so that the configuration shown in FIG. 2 is effective.

The power supply apparatus shown in FIG. 2 includes a capacitor bank 1, a charging circuit 12, a capacitor 14, and a diode 16 in addition to the configuration shown in FIG.
Since the basic configuration is the same as that of FIG. 1, only the portions different from FIG. 1 will be described here.

  In a state where the interlock switch 9 is closed, the capacitor 14 is charged via the diode 16 and stored. When the interlock switch 9 is opened while the excitation coil of the relay 5 is energized, the power stored in the capacitor 14 is supplied to the excitation coil. Therefore, since the non-energized state of the exciting coil is delayed, the opening of the relay 5 is also delayed. Note that the power stored in the capacitor 14 is prohibited from being discharged to other circuits by the diode 16.

  On the other hand, the FET open / close circuit 7 is directly input with a signal indicating that the interlock switch 9 is opened, so that the FET 6 is turned off without delay.

  The capacitor bank 1 is an electric double layer capacitor that can be charged and discharged, and the charging circuit 12 performs constant voltage charging, constant power charging, and constant voltage charging. Detailed operation of the capacitor bank 1 will be described later with reference to FIG.

  Here, the operation of the power supply apparatus illustrated in FIG. 3 will be described with reference to FIG. FIG. 4 is a timing chart showing the operation of the FET 6 and the relay 5 when the interlock switch 9 shown in FIG. 3 is opened and closed. The timing chart shown in FIG. 4 is substantially the same as the timing chart shown in FIG. That is, since the opening of the relay 5 is delayed by the stored power of the capacitor 14, the description is omitted here because it is the same as FIG. 2.

  As described above, according to the present embodiment, power storage means (capacitor 14) for supplying power to the relay 5 is provided, and when the interlock switch 9 is opened, power is supplied from the capacitor 14 to the relay 5. Thus, since the relay 5 can be turned off after the relay 5 is delayed and the FET 6 is reliably turned off, it is possible to allow time for the FET 6 to be turned off, thereby preventing deterioration and welding of the relay contacts. can do. Further, since the die auto 16 prevents discharge to other circuits, a capacitor having a small capacity can be used.

FIG. 5 is a diagram illustrating still another example of the power supply apparatus according to the present embodiment.
FIG. 5 shows a case where the open / close signal of the interlock switch 9 is input to the interrupt terminal 18 of the CPU in the control unit 13 and the FET 6 is turned off in software.

The power supply apparatus shown in FIG. 5 is provided with the interrupt terminal 18 described above in addition to the configuration shown in FIG. Further, a resistor R is provided instead of the FET switching circuit 7.
Since the basic configuration is the same as that shown in FIGS. 1 and 3, only the portions different from those shown in FIGS.

  The open / close signal of the interlock switch 9 is input to the interrupt terminal (INT) 18 of the CPU via the voltage conversion buffer 11. The FET 6 is ON / OFF controlled by the port 3 of the control unit 13.

An operation of the control unit 13 in the configuration of the power feeding device illustrated in FIG. 5 will be described.
FIG. 6 is a timing chart showing the operation of the control unit 13.

  When the interlock switch 9 is opened and an interrupt occurs, the control unit 13 outputs a signal for turning off the FET 6 from the port 3 of the control unit 13. Next, a signal for opening the relay 5 in a software manner is output after a predetermined time when the relay 5 is opened using the power stored in the capacitor 14.

  Further, when the interlock switch 9 is closed and an interrupt occurs, the control unit 13 outputs a signal for closing the relay 5 from the port 2 of the control unit 13, and after the time considering the chattering time of the relay contact has elapsed, the FET 6 is turned on. A signal to be turned on is output from the port 3 of the control unit 13. Since the FET 6 is turned on after the contact of the relay 5 is connected, a large current does not flow when the contact of the relay 5 is turned on. Even if the interlock switch 9 is closed, if it is not necessary to supply power to the fixing heating unit, the signal for turning on the FET 6 is not output.

  As described above, according to the present embodiment, by inputting the open / close signal of the interlock switch 9 to the interrupt terminal of the control unit 13, the FET is quickly cut off softly, and the relay uses the power stored in the capacitor 14. And can be turned off. Thereby, it is possible to simplify the circuit configuration of the power feeding apparatus.

FIG. 7 is an external view schematically showing the image forming apparatus of the present embodiment.
In FIG. 7, the front cover 100 of the image forming apparatus is in an open state. The front cover 100 prevents the drive unit and the high voltage power supply unit inside the image forming apparatus from being touched. When the front cover 100 is closed, the projecting portion 200 provided on the front cover 100 enters the groove portion 300, and the door switch 400 provided on the groove portion 300 is further closed. Conversely, when the front cover 100 is opened, the door switch 400 is also opened.

FIG. 6 is a perspective view schematically showing the periphery of the door switch 400.
As described above, when the front cover 100 is closed, the lever 500 of the door switch 400 provided in the groove portion 300 is pushed. As a result, the switch contact inside the door switch 400 is connected and the electric wire 600 is energized.

  FIG. 9 is a diagram schematically illustrating a control circuit configuration of an image forming apparatus including the power supply apparatus according to the present embodiment. Here, the power feeding device shown in FIG. 5 is used.

First, the charging circuit 12 will be described.
The charging circuit 12 includes an output generation unit 121 that generates an output voltage, an output control unit 122 that controls the output voltage, and a charging voltage detection circuit 123 that is fed back to the output control unit 122.

The output control means 122 includes a CPU 122a, a serial controller (SIC) 122b connected to the CPU 122a via an internal bus, an A / D converter 122c, a charging current detection circuit 122d, a constant voltage output, a constant current charging and And a PWM generator circuit 122e for constant power charging. Although not shown here, it includes a ROM, a RAM, a timer, an interrupt control circuit, an input / output port, and the like.
Detailed description will be given below.

  The AC input from the AC power source 71 via the main power switch 72 is connected to the full-wave rectifier circuit 47 via the filter 73 and is full-wave rectified. From this full-wave rectified output, ripple components and the like are removed by the smoothing capacitor C2.

  On the DC output side of the full-wave rectifier circuit 74, a primary coil 20a of a high-frequency transformer 20 is connected in parallel with the smoothing capacitor C2, and an FET 6 is connected in series as a switching means to the primary coil 20a. When the FET 6 is switched (ON / OFF operation) by the PWM signal output from the PWM generation circuit 122e for constant voltage output, constant current charging and constant power charging, the switching circuit constituted by the FET 6 is connected to the primary coil 20a. Switching current flows.

A switch voltage is induced in the secondary coil 20b of the transformer 20 by the switch current on the primary coil 20a side. If the conduction period of the switching frequency is changed, the output voltage can be controlled. Diodes D1 and D2 are connected to the secondary coil 20b of the transformer 20 as a rectifier circuit. The switching voltage is rectified by the rectifier circuit, smoothed by the choke coil 75 and the capacitor C1, and converted into a DC output.
This DC output is supplied to the capacitor bank 1 through the diode 76.

Next, an operation for charging the capacitor bank 1 will be described.
The capacitor bank 1 in the power supply device of the present embodiment is connected in series with 18 capacitor cells (electric double layer capacitor access) that become 2.5 V when fully charged. Therefore, when 18 capacitor cells are fully charged, a voltage of 45 V is stored.

  Note that the capacitor bank 1 of the power supply apparatus according to the present embodiment has a cell configuration with a capacity capable of preventing a temperature drop during continuous copying of a target image forming apparatus or a capacity capable of achieving a required fixing start-up time. .

Next, the operation of the charging voltage detection circuit 123 charged in the capacitor bank 1 will be described.
The inter-terminal voltage of the capacitor bank 1 is detected by a charging voltage detection circuit 123 that forms a voltage dividing circuit with the resistors R2 and R3. The output is input to the A / D converter 122c of the PWM generation circuit 122e for constant voltage output, constant current charging and constant power charging, and the A / D converter 77b of the engine control unit 77.

  This output voltage is monitored by a PWM generation circuit 122e for constant voltage output, constant current charging and constant power charging, and is controlled by changing the ON duty of the PWM signal. The constant voltage output, constant current charging and constant power charging PWM generation circuit 122e will be described later.

Next, a method for detecting the charging current of the capacitor bank 1 will be described.
The charging current of the capacitor bank 1 is detected by detecting the current flowing through the resistor R1 connected in series with the capacitor bank 1 as a voltage between terminals, and charging the constant voltage output, constant current charging and constant power charging PWM generation circuit 122e. The current is input to the current detection circuit 122d.

  Next, the operation of the equalizing circuit 1d that detects the full charge of each capacitor cell, operates the bypass circuit 1b, and equalizes the charging voltage of each capacitor cell 1a will be described.

  When the capacitor cell 1a is charged by the output generation means 121 and is charged to a full charge of 2.5V, the equalization circuit 1d bypasses the charging current. Bypass circuits connected in parallel to the other capacitor cells 1a also perform the same operation, and the charging voltage of each capacitor cell 1a is equalized.

  When the equalization circuit 1d detects the full charge of any capacitor cell 1a and operates the bypass circuit, it outputs a single cell full charge signal 44 to the constant voltage output, constant current and constant power PWM generation circuit 122e. To do. Further, when the equalization circuit 1d detects the full charge of all the capacitor cells and operates all the bypass circuits, the equalization circuit 1d causes the constant voltage output, constant current and constant power charging PWM generation circuit 122e to be fully charged. A charge signal 45 is output.

  Next, the charging voltage detection of the capacitor bank 1, the detection of the charging current and the operation of the bypass circuit are detected, and the capacitor bank 1 is subjected to constant current charging or constant power charging. For constant voltage output, constant current charging and constant power charging The operation of the PWM generation circuit 122e will be described.

  The constant voltage output, constant current charging and constant power charging PWM generation circuit 122e detects the charging voltage of the capacitor bank 1, the detection of the charging current and the operation of the bypass circuit, and the capacitor bank 1 is charged with constant current and constant power. Or it is a circuit which generates the PWM signal for performing constant voltage charge.

  The constant voltage output, constant current charge and constant power charge PWM generation circuit 122e detects the voltage across the capacitor bank 1 from the output of the charge voltage detection circuit 123, and the voltage across the capacitor bank 1 is a preset value. When the voltage is lower, the voltage between the terminals of the resistor R1 connected in series with the capacitor bank is sequentially detected, and a PWM signal corresponding to the voltage between the terminals and used for preset constant current charging is supplied to the FET 6. Output to the gate.

  The PWM signal for setting the preset constant current charge may use a table in which the relationship between the voltage across the resistor R1 and the ON duty of the PWM signal is created in advance, or calculated by calculation. May be. Alternatively, the PWM signal may be controlled so that only a charging current is referred to and a preset charging current is obtained. Further, when the capacitor bank 1 is not charged, in order to prevent a large inrush current from flowing into the capacitor bank 1, the PWM voltage is set such that the output voltage is initially reduced and gradually increased. A signal may be output.

  When the voltage between the terminals of the capacitor bank 1 becomes equal to or higher than a preset value, the constant voltage output, constant current charging and constant power charging PWM generation circuit 122e determines the charging current of the capacitor bank 1 to perform constant power charging. The voltage between the terminals of the capacitor bank 1 is sequentially detected. Then, a PWM signal for performing preset constant power charging is output to the gate of the FET 6 from the detected charging current and charging voltage.

  The PWM signal detects the charging current of the capacitor bank and the voltage across the terminals of the capacitor bank 1, and uses the PWM signal to perform preset constant power charging from the detected charging current and charging voltage. Calculate and determine.

  When the constant voltage output, constant current charge, and constant power charge PWM generation circuit 122e detects any single cell full charge signal 44, it outputs a PWM signal for preset constant current charge to the gate of the FET 6 again. To do. Further, the constant voltage output, constant current charge and constant power charge PWM generation circuit 122e, when detecting the full charge signal 45 of all the capacitor cells, performs a constant voltage charge for a certain period, and then sends a signal for stopping the charge operation to the FET 6 Output to the gate.

Next, the engine control unit 77 and its peripheral parts will be described.
The engine control unit 77 includes a CPU 77a, an A / D converter 77b connected to the CPU 77a via an internal bus, an input / output port 77c, a serial controller (SCI) 77d, an NV-RAM 77e, a ROM, a RAM, a timer, and an interrupt. It consists of a control circuit (INT) and the like.
In this embodiment, an AC fixing heater 30 is provided as a heating unit of the fixing device, and a DC fixing heater 22 is provided as an auxiliary heater.

The A / D converter 77b of the engine control unit 77 is connected to fixing overheated part temperature detection circuits 28 and 33 for detecting the surface temperature (fixing temperature) of the fixing roller 81 of the fixing device 80 shown in FIG.
The fixing overheated portion temperature detection circuit 28 includes a resistance R10 connected in series with a DC heater thermistor 28a, and has a measurement region corresponding to the DC fixing heater 22 (the fixing heater 2 in FIGS. 1, 3 and 5). This circuit detects the temperature. The fixing temperature detection circuit 33 includes a resistor R11 connected in series with the AC heater thermistor 33a, and is a circuit that detects the temperature of the measurement region corresponding to the AC fixing heater 30. The DC fixing heater 22 is used as an auxiliary heater when the temperature drops during start-up and continuous copying.

  The input / output port 77c is connected to the relay 5 for supplying the electric power stored in the capacitor bank 1 to the DC fixing heater 22 provided in the fixing device according to the temperature detection result of the fixing overheating portion temperature detection circuit 28 and the discharge. An AC heater control circuit 43 that supplies power to the AC fixing heater 30 based on detection results of the circuit (FET) 6 and the fixing temperature detection circuit 33, and a load 78 such as a motor, solenoid, and clutch necessary for performing an image forming operation. Inputs such as a sensor 19 and a switch circuit 15 necessary for performing an image forming operation are connected.

  The output signal of the interlock switch 9 is connected to the interrupt control circuit 77e. Further, the CPU 77a of the engine control unit 77 executes an interrupt processing routine according to an open / close signal of the interlock switch 9. Furthermore, the CPU 77a of the engine control unit 77 transmits and receives signals via the output control means 122 and the serial controller (SCI) 77d.

  Further, the CPU 77a of the engine control unit 77 detects the voltage between the terminals of the capacitor bank 1 by the charging voltage detection circuit 123, and determines whether or not the power of the capacitor bank 1 can be discharged. Further, the CPU 77 outputs the voltage value supplied by the DC fixing heater 22 or a pattern for starting up the fixing device to the CPU 122 a of the output control unit 122.

Next, the AC heater control circuit 43 will be described.
When the main power is turned on and during a normal copy operation, power is supplied to the AC fixing heater 30 to perform the copy operation. When the fixing temperature detection circuit 33 detects a temperature equal to or lower than a preset temperature, the CPU 77a of the engine control unit 77 outputs a signal for turning on the triac to the photo triac drive circuit 35 from the port 4 of the engine control unit 77. At this time, electric power is supplied to the fixing heater 30.

  On the other hand, when the fixing temperature detection circuit 33 detects a temperature equal to or higher than a preset temperature, a signal for turning off the triac is output from the port 4 of the engine control unit 77 to the phototriac drive circuit 35. At this time, power supply to the AC fixing heater 30 is stopped.

Next, an operation for supplying power to the DC fixing heater 22 will be described.
The CPU 77a of the engine control unit 77 checks the charging voltage of the charging voltage detection circuit 123 when the main power is turned on, and then supplies the stored power of the capacitor bank 1 to the DC fixing heater 22 to A signal for turning on the relay 5 is output from the port 2. Then, after the chattering time of the relay contact has elapsed, a signal for turning on the FET 6 is output from the port 3 of the input / output port 77c. By this operation, welding and deterioration of the relay contacts are prevented, and the power stored in the capacitor bank 1 is supplied to the DC fixing heater 22.

  Alternatively, when the temperature of the fixing heating unit decreases during continuous copying and reaches a temperature at which an unfixed image is generated, the full-cell full charge signal from the output control unit 122 or the charging voltage of the charging voltage detection circuit 123 is confirmed. Thereafter, in order to supply the stored power of the capacitor bank 1 to the DC fixing heater 22, a signal for closing the relay 5 is output from the port 2 of the input / output port 77c. Then, a signal for turning on the FET 6 is output from the port 3 of the input / output port 77c after a predetermined time has elapsed. At this time, the power stored in the capacitor bank 1 is supplied to the DC fixing heater 22.

  The CPU 77a of the engine control unit detects the temperature of the fixing heating unit by the fixing overheating unit temperature detection circuit 28. When a temperature detection equal to or higher than a preset temperature is detected, a signal for turning off the FET 6 is output from the port 3 of the input / output port 77c in order to stop the power discharge of the capacitor bank 1. Then, after a certain time has elapsed, a signal for opening the relay 5 is output from the port 2 of the input / output port 77c.

  When supplying power to the fixing and heating unit, the relay 5 may be kept closed, and the power may be supplied only by ON / OFF control of the FET 6. By doing so, it is possible to prevent deterioration of the relay contact when power is supplied to the fixing heating unit.

  Next, the operation of the CPU 77a of the engine control unit 77 when the interlock switch 9 is opened / closed provided in the image forming apparatus of the present embodiment will be described. The circuit configuration for supplying the stored power of the capacitor bank 1 to the fixing heating unit is the same as that in FIG. 5 described above, and the description thereof is omitted.

In FIG. 9, reference numeral 21 denotes an overtemperature prevention unit, which includes the relay 3 and the thermostat 4.
In the CPU 77a, when an interrupt is generated by a signal indicating that the interlock switch 9 is opened, a signal for turning off the FET 6 is output from the port 3 of the engine control unit 77 in the interrupt processing routine. Then, a signal for opening the relay 5 is output from the port 2 of the engine control unit 77 after a predetermined time has elapsed.

An operation when the interlock switch 9 is closed will be described.
In the CPU 77a, when an interrupt is generated by a signal indicating that the interlock switch 9 is closed, a signal for closing the relay 5 is output from the port 2 of the engine control unit 77 in the interrupt processing routine. Next, when the temperature of the fixing heating unit requires an auxiliary power source, a signal for turning on the FET 6 is output from the port 3 of the engine control unit 77 after measuring the chattering time of the relay contact. Since the relay is not opened and closed when a large current flows through the relay contact portion, it is possible to prevent welding and deterioration of the relay contact.

Next, the control circuit 79 that controls the entire image forming apparatus of the present embodiment will be described.
The control circuit 79 includes a CPU 79a that controls the entire image forming apparatus of the present embodiment, a serial controller (SCI) 79b connected to the CPU 79a via an internal bus, a ROM, a RAM, a work memory for image development used in a printer, It consists of a frame memory that temporarily stores image data of a written image, an ASIC equipped with a function for controlling the periphery of the CPU, and its interface circuit.

  The control circuit 79 operates a panel to input system settings performed by the user, an operation unit control circuit 37 that performs display / input control for displaying the system setting contents to the user, an engine control unit 77, Are connected via a serial controller (SCI).

Here, an operation in the case where the power of the capacitor bank 1 is supplied to the fixing heater 22 will be described.
FIG. 10 is a flowchart showing an operation for supplying the electric power of the capacitor bank 1 to the fixing heater 22.

  The CPU 77a of the engine control unit 77 first checks whether the fixing temperature is equal to or lower than a preset temperature (step S101). This confirmation is made by reading the output of the fixing overheated part temperature detection circuit 28 from the A / D port 77b. When the temperature is lower than a preset temperature, for example, when the temperature is 180 ° C. or lower (step S101 / Yes), a signal for turning on the relay 5 is output from the port 2 of the input / output port 77c (step S102). Then, the time for which the relay contact is reliably turned on is measured.

  After measuring the time, next, the output of the fixing overheated portion temperature detection circuit 28 is read from the A / D port 77b to confirm whether the fixing temperature is equal to or lower than a preset temperature (step S104). When the temperature is lower than a preset temperature, for example, when the temperature is 180 ° C. or lower (step S104 / Yes), a signal for turning on the FET 6 is output from the port 3 of the input / output port 77c (step S105). And the timer which measures the time which supplied electric power to the fixing heating part is started (step S106).

  Next, it is confirmed whether the fixing temperature exceeds a preset temperature (step S107). This confirmation is performed by reading the output of the fixing overheated part temperature detection circuit 28 from the A / D port 77b as in step S101 described above. If the preset fixing temperature is exceeded (step S107 / Yes), a signal for turning off the FET 6 is output from the port 3 of the input / output port 77c (step S108). Finally, a timer for measuring the time during which power is supplied to the fixing heating unit is cleared (step S109).

  Furthermore, whether the fixing temperature is equal to or lower than a preset temperature is checked again by reading the output of the fixing overheated part temperature detection circuit 28 from the A / D port 77b, and the above-described operation is repeated. In the present embodiment, the fixing temperature is controlled by the ON / OFF operation of the FET 6, but of course, it may be performed by ON / OFF control of both the relay 5 and the FET 6.

  If the fixing temperature is equal to or higher than the set temperature in step S101 described above (step S101 / No), the process proceeds to step S104, where the fixing temperature is equal to or lower than a preset temperature, or the fixing overheated part temperature detection circuit 28. Is read from the A / D port 77b and checked again. Furthermore, when the fixing temperature is equal to or higher than a preset temperature in the confirmation in step S104 described above (step S104 / No), the process proceeds to step S107.

FIG. 11 is a flowchart showing an operation in the case where the CPU 77a performs ON / OFF control of the relay 5 and the FET 6 when the interlock switch 9 shown in FIG. 9 is opened and closed.
The open / close signal of the interlock switch 9 is connected to the interrupt terminal of the CPU 77a. This interrupt terminal generates an interrupt regardless of whether the interlock switch 9 is opened (falling) or closed (rising). The interrupt pin to be used is used.

  First, when an interrupt is generated by the opening / closing signal of the interlock switch 9, the CPU 77a of the engine control unit 77 checks whether the interlock switch 9 is opened (Low) by the port 1 of the engine control unit 77 (step). S201). If the signal indicates that the interlock switch 9 is released (step S201 / Yes), it is confirmed whether a flag that is set when the interlock switch 9 is opened is set (step S202). If the flag at the time of releasing the interlock switch is set here (step S202 / Yes), the process is terminated. On the other hand, if the flag is not set (step S202 / No), the flag that is set when the interlock switch 9 is opened is set (step S203).

  Next, in the flowchart for supplying the power of the capacitor bank 1 to the fixing heating unit described with reference to FIG. 10, it is confirmed whether the timer for measuring the time during which the power supply to the fixing heating unit is continued is equal to or less than a preset time. (Step S204). Here, when the measurement result of the timer exceeds the preset time (step S204 / No), a signal for turning off the FET 6 is output from the port 3 of the input / output port 77c (step S206). Finally, a signal for turning off the relay 5 is output from the port 2 of the input / output port 77c (step S207), and the process is terminated.

  If the timer measurement result is equal to or shorter than the preset time in step S204 (step S204 / Yes), the confirmation is continued until the preset time elapses (step S205). Then, after a preset time has elapsed, a signal for turning off the FET 6 is output from the port 3 of the input / output port 77c (step S206), and a signal for turning off the relay 5 is output from the port 2 of the input / output port 77c. (Step S207), the process ends.

  On the other hand, if it is not the signal (Low) at which the interlock switch 9 is opened at Step S201 described above (Step S201 / No), it is determined whether the signal at which the interlock switch 9 is closed is the port of the input / output port 77c. 1 is confirmed (step S208). If the interlock switch 9 is not a closed signal (H) (step S208 / No), the process is terminated.

  In the case of interruption of the signal (H) in which the interlock switch 9 is closed (step S208 / Yes), it is confirmed whether a flag that is set when the interlock switch 9 is opened is set (step S209). . If the release flag is not set (step S209 / No), the process ends. If the flag is set (step S209 / Yes), the flag that is set when the interlock switch 24 is opened is reset (step S210).

Next, whether or not the fixing temperature is equal to or lower than a preset temperature is read from the A / D port 77b to confirm the output of the fixing overheated portion temperature detection circuit 28 (step S211). If the fixing temperature is lower than a preset temperature such as 180 ° C. (step S211 / Yes), a signal for turning on the relay is output from the port 2 of the input / output port 77c (step S212). And the time which considered the chattering time of the relay is measured (step S213). Here, after a predetermined time has elapsed, a signal for turning on the FET 6 is output from the port 3 of the input / output port 77c (step S214), and the process is terminated.
If the fixing temperature exceeds the preset temperature in step S211 described above (step S211 / No), the process ends at that time.

  As described above, according to the present embodiment, it is possible to prevent the FET 6 from turning off the FET 6 due to a large inrush power flowing through the heater immediately after the fixing heater is discharged. That is, the time from the start of power supply to the time when the interlock switch 9 is opened is measured, and if the measured result is shorter than the preset time, the FET 6 is opened after a certain time has elapsed. The FET 6 can be prevented from being damaged.

FIG. 12 is a longitudinal side view showing a schematic configuration of the fixing device 80 of the image forming apparatus having the power supply device of the present embodiment.
As shown in FIG. 12, the fixing device 80 according to the present embodiment includes a fixing roller 81 as a fixing member, a pressure roller 82 as a pressure member, and the fixing roller 81 with a certain pressure. And pressurizing means (not shown) for pressing against the surface. The fixing roller 81 and the pressure roller 82 are rotationally driven by a driving mechanism (not shown).

  The fixing device 80 includes the AC fixing heater 30 and the DC fixing heater 22 described in FIG. 9, the fixing heater, the AC heater thermistor 33a for detecting the surface temperature of the fixing roller 81, and the DC heater thermistor 28a. Is provided.

  The AC fixing heater 30 and the DC fixing heater 22 are disposed inside the fixing roller 81, and heat the fixing roller 81 from the inside to supply heat to the fixing roller 81. The AC heater thermistor 33 a and the DC heater thermistor 28 a are in contact with the surface of the fixing roller 81, respectively, and detect the surface temperature (fixing temperature) of the fixing roller 81. The AC heater thermistor 33 a is disposed in the measurement region corresponding to the AC fixing heater 30, and the DC heater thermistor 28 a is disposed in the measurement region corresponding to the DC fixing heater 22.

  The AC fixing heater 30 is a heater that is turned on to heat the fixing roller 81 when the temperature of the fixing roller 81 does not reach the target temperature. Further, the DC fixing heater 22 is charged when the main power of the image forming apparatus according to the present embodiment is turned on or when the image forming apparatus starts up from the off mode for energy saving until the copy can be performed, that is, when the fixing apparatus 80 is warmed up. It is a heater that assists the start-up of the fixing device 80 using the stored power of the part. In such a fixing device 80, the sheet carrying the toner image is heated and pressed by the fixing roller 81 and the pressure roller 82 when passing through the nip portion between the fixing roller 81 and the pressure roller 82. As a result, the toner image is fixed on the sheet.

  According to the power supply apparatus, the image forming apparatus, the power supply apparatus control method, the image forming apparatus control method, the program, and the recording medium according to the present embodiment, power is supplied to a load configured by the mechanical switching means and the semiconductor switching means. In the power feeding device, it is possible to prevent deterioration and welding of the mechanical switch contact when the interlock switch is opened and closed.

It is a figure which shows typically the electric power feeder of this embodiment comprised by the interlock switch 9, the mechanical relay 5, and the semiconductor (FET) 6. FIG. It is a timing chart which shows operation | movement of the electric power feeder of FIG. It is a figure which shows the structure of the electric power feeder in case stored power is supplied to the relay 5 when the interlock switch 9 opens in order to delay the opening of the relay 5 intentionally rather than the opening operation of FET6. FIG. 4 is a timing chart showing the operation of the power supply apparatus of FIG. 3. FIG. FIG. 3 is a diagram showing a configuration of a power feeding device when an open / close signal of an interlock switch 9 is input to an interrupt terminal of a CPU of a control unit 13 and a FET 6 is turned off by software. 6 is a timing chart illustrating an operation of the power feeding device of FIG. 5. 1 is a diagram schematically illustrating an appearance of an image forming apparatus according to an embodiment. It is a figure which shows the peripheral part of the door switch. FIG. 2 is a diagram schematically illustrating a control circuit of an image forming apparatus having a power supply device according to the present embodiment. 6 is a flowchart showing an operation when supplying power from the capacitor bank 1 to the heat fixing unit. 4 is a flowchart showing an interrupt routine for opening / closing an interlock switch 9; FIG. 2 is a diagram schematically illustrating a configuration of a fixing device 80.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Capacitor bank 1a Capacitor cell 1b Bypass circuit 2 Fixing heater 3, 5 Relay 4 Thermostat 6 FET (semiconductor switch)
7 FET open / close circuit 8 Relay drive circuit 9 Interlock switch 10 Open collector buffer 11 Voltage conversion buffer 12 Charging circuit 13 Control unit 14 Capacitor 16 Diode 21 Overtemperature prevention unit 28 Fixing overheating unit temperature detection circuit

Claims (23)

Semiconductor switching means and relay switching means connected in series to perform switching operation of power supplied to the load,
An interlock switch that opens and closes the supply of electric power as the object moves,
Semiconductor opening / closing control means for controlling an opening / closing operation related to power supply of the semiconductor opening / closing means;
An open / close operation control means for controlling the relay open / close means and the semiconductor open / close control means based on an open / close signal accompanying the open / close operation from the interlock switch;
The relay opening / closing means and the semiconductor opening / closing control means perform an opening / closing operation based on the electric power supplied via the interlock switch,
The opening / closing operation control means controls to supply the power to the relay opening / closing means based on a closing instruction signal from the interlock switch, and to supply the power to the semiconductor opening / closing means after a predetermined time has elapsed. A power supply device.   The power supply apparatus according to claim 1, further comprising a first power storage unit that accumulates the power supplied via the interlock switch and supplies the power to the relay opening / closing unit.   The electric power supplied to the first power storage means via the interlock switch is supplied via a unidirectional semiconductor element provided on a power supply line between the interlock switch and the first power storage means. The power feeding device according to claim 2, wherein the power feeding device is supplied to the first power storage unit.   4. The semiconductor opening / closing means control means controls the opening / closing operation of the semiconductor opening / closing means based on the electric power supplied via the interlock switch. Power supply device.   5. The power feeding device according to claim 1, wherein the open / close operation control unit further includes an interrupt terminal, and the open / close signal from the interlock switch is input to the interrupt terminal. 6. . An image forming apparatus comprising the power feeding device according to claim 1,
Heating means for heating and fixing the original image transferred on the transfer paper during image formation;
An image forming apparatus, wherein a load to which electric power is supplied is the heating unit.   The image forming apparatus according to claim 6, further comprising a chargeable / dischargeable second power storage unit that supplies the power to the heating unit. Detecting means for detecting an open / close signal of an interlock switch that performs an open / close operation of supplying power in accordance with the movement of the object;
A timer that measures the time from when the power supply to the heating means is started until the interlock switch is opened,
When the time measured by the timer is shorter than a predetermined time set in advance, an opening operation of the semiconductor opening / closing means for supplying the electric power to the heating means is opened after a predetermined time has elapsed. The image forming apparatus according to claim 6 or 7. Semiconductor open / close control process for controlling the open / close operation related to the power supply of the semiconductor open / close means connected in series to perform the open / close operation of the power supplied to the load, and the interlock for performing the open / close operation of the power supply as the object moves A control method for a power supply apparatus, comprising: an opening / closing operation control step for controlling a relay opening / closing means and the semiconductor opening / closing means based on an opening / closing signal accompanying the opening / closing operation from a switch,
The opening / closing operation control step includes:
Based on the electric power supplied through the interlock switch, controls the opening and closing operation of the relay opening and closing means and the semiconductor opening and closing means,
A method for controlling a power supply apparatus, comprising: supplying power to the relay opening / closing means based on a closing instruction signal from the interlock switch; and supplying the power to the semiconductor opening / closing means after a predetermined time has elapsed. .   The method for controlling a power feeding apparatus according to claim 9, further comprising a first power storage step of accumulating the electric power supplied via the interlock switch and supplying the electric power to the relay opening / closing means.   The power supply according to claim 10, wherein the electric power supplied in the first power storage process through the interlock switch is stored from the interlock switch through a unidirectional semiconductor element. Control method of the device.   The power supply apparatus according to any one of claims 9 to 11, wherein the control step controls the opening / closing operation of the semiconductor opening / closing means based on the electric power supplied via the interlock switch. Control method.   The method for controlling a power feeding device according to any one of claims 9 to 12, further comprising an interrupting step in which the open / close signal from the interlock switch is input to an interrupt terminal. A control method for an image forming apparatus comprising the power supply device according to claim 9,
A heating step of heating and fixing the original image transferred onto the transfer paper during image formation;
A method of controlling an image forming apparatus, wherein power is supplied during the heating step.   15. The method of controlling an image forming apparatus according to claim 14, further comprising a second power storage step capable of charging and discharging to supply the electric power in the heating step. A detection step of detecting an open / close signal of an interlock switch that performs an open / close operation of supplying power in accordance with the movement of the object;
A measurement process for measuring a time from when the power supply to the heating process is started until the interlock switch is opened,
15. The opening operation of a semiconductor opening / closing step for supplying the electric power to the heating step is opened after a predetermined time when the measured time is shorter than a predetermined time set in advance. Or a method of controlling an image forming apparatus according to 15. Semiconductor open / close control process for controlling the open / close operation related to the power supply of the semiconductor open / close means connected in series to perform the open / close operation of the power supplied to the load, and the interlock for performing the open / close operation of the power supply as the object moves A program for causing a computer to execute an opening / closing operation control process for controlling the relay opening / closing means and the semiconductor opening / closing means based on an opening / closing signal accompanying the opening / closing operation from a switch,
The opening / closing operation control process includes:
Based on the electric power supplied through the interlock switch, the switching operation of the relay switching means and the semiconductor switching means is controlled,
The power is supplied to the relay opening / closing means based on a closing instruction signal from the interlock switch, and the computer is executed to control to supply the power to the semiconductor opening / closing means after a predetermined time has elapsed. Program to do.   18. The program according to claim 17, wherein the computer stores the electric power supplied via the interlock switch and causes the computer to execute a first power storage process for supplying the electric power to the relay opening / closing means.   The computer is configured to store the electric power supplied in the first power storage process via the interlock switch through the unidirectional semiconductor element from the interlock switch. 18. The program according to 18.   20. The control process according to claim 17, further comprising: causing a computer to control the opening / closing operation of the semiconductor opening / closing means based on the power supplied via the interlock switch. Program described in the section.   21. The program according to claim 17, further causing a computer to execute an interrupt process in which the open / close signal from the interlock switch is input to an interrupt terminal. A detection process for detecting an open / close signal of an interlock switch that performs an open / close operation of power supply according to the movement of an object;
A heating process for heating and fixing the original image transferred on the transfer paper during image formation by the image forming apparatus;
A second power storage process for supplying the power from a chargeable / dischargeable power storage unit during the heat treatment;
During the heat treatment, the computer executes a measurement process for measuring the time from when the power supply is started from the power storage unit until the interlock switch is opened,
When the measured time is shorter than a predetermined time set in advance, the computer is caused to perform an opening operation of the semiconductor opening / closing means for supplying the electric power from the power storage unit after a predetermined time has elapsed. A featured program.   A computer-readable recording medium on which the program according to any one of claims 17 to 22 is recorded.

Images