JP2008070639A - Power control apparatus and image forming apparatus - Google Patents

Abstract

A power control apparatus and an image forming apparatus that can be used in common regardless of the voltage of a commercial power supply.
A first AC input unit 1 powered from a commercial power source, a second AC input unit 2 powered from a commercial power source, first load circuits 18 and 19 connected to the first AC input unit 1, A first load circuit 21 and 28 connected to the second AC input means, and a first AC circuit formed by connecting to the second AC input unit 1 to connect the second AC input unit 1 and the first load circuits 18 and 19. In order to connect the connection terminal 3a and the second AC input unit 2 to the first load circuits 18 and 19, a second connection terminal 3b formed to be connected to the first load circuits 18 and 19 is provided.
[Selection] Figure 1

Description

  The present invention relates to a power control apparatus and an image forming apparatus that supply power to each load circuit.

  In recent years, there has been an increasing demand for higher speed image forming apparatuses. Along with the increase in the size of the image forming apparatus accompanying this higher functionality, the power consumption has also increased. In particular, in the case of an image forming apparatus having a heat roller type fixing device that pressurizes and heats a heated object such as paper or film on which a toner image is formed, a large amount of electric power is required. Further, when elements for colorization and high accuracy are added, high-voltage loads, motor loads, electric circuit loads, and the like increase. This further increases power consumption.

  As is well known, the current is limited to 15 A or less when a single power cord is used for AC input from the most common commercial 100V AC wiring outlet in Japan. Although it is possible to correspond to 200V, in this case, it is necessary to perform a special work related to the power supply at the installation location. This is an adverse effect of device replacement.

  In order to solve such a problem, an image forming apparatus having two power cords of a first power cord and a second power cord is known (for example, see “Patent Document 1”). In this image apparatus, a fixing heater 1 and a fixing heater 2 to which power is supplied from two power cords are provided, a relay 1 that supplies power to the fixing heater 2 from the first power cord, and a fixing heater 2 from the second power cord. The relay 2 which supplies electric power to is provided. Then, by controlling ON / OFF of the relays 1 and 2 according to each operation mode of the image forming apparatus, the input from one power cord is set to 15 A or less.

  Also, a first AC terminal and a second 2AC terminal are provided, and power is supplied from the first AC terminal 1 to the AC load of the drum heater and cassette heater, and power is supplied from the second AC terminal to the fixing heater. Thus, there is also known an image forming apparatus in which an input from one power cord is 15 A or less (see, for example, “Patent Document 2”).

Japanese Patent Laid-Open No. 2003-323085 JP 2005-121681 A

  However, in Japan, the commercial power supply is 100V, while the commercial power supply in North America is 115V and the commercial power supply in Europe is 200V. Also in Japan, some have 200V commercial power sources such as factories, buildings and offices. Even with an image forming apparatus that requires power supply from two power cords with a 100V20A power supply, the power from one power cord can be satisfied with a 200V commercial power supply.

  According to such a difference in the voltage of the commercial power supply, an image forming apparatus compatible with a 100V power source, that is, a power cord having two power supplies, and an image forming apparatus compatible with a 200V power source, that is, a power cord having one power cord, are separately formed. Then, there are problems such as an increase in parts, manufacturing costs, and management costs.

  SUMMARY An advantage of some aspects of the invention is that it provides a power control apparatus and an image forming apparatus that can be used in common regardless of the voltage of a commercial power source.

  In order to solve the above-mentioned problems and achieve the object, the invention according to claim 1 is a power control device, wherein the first AC input means is supplied with power from a commercial power source, and the first AC input means is supplied with power from the commercial power source. 2 AC input means, a first load circuit connected to the first AC input means, a second load circuit connected to the second AC input means, and the second AC input means and the first load circuit are connected. Therefore, a first connection terminal formed to be connected to the second AC input means, and a first connection terminal formed to be connected to the first load circuit to connect the second AC input means and the first load circuit. And 2 connection terminals.

  According to a second aspect of the present invention, there is provided a power control apparatus, comprising: a first AC input unit that is supplied with power from a commercial power source; a second AC input unit that is supplied with power from a commercial power source; a first region; A printed wiring board having a region and a third region formed narrower than the first region and the second region and formed between the first region and the second region; A first load circuit formed with a conductive foil pattern on one region and connected to the first AC input means, and a second load circuit formed with a conductive foil pattern on the second region and connected to the second AC input means A load circuit; a connection circuit formed on the third region with a conductive foil pattern; connecting the second AC input means and the first load circuit; and formed in the third region; cutting the connection circuit. With notch means The features.

  The invention according to claim 3 is the power control apparatus according to claim 2, wherein the conductive foil pattern of the connection circuit in the third region flows a current of a predetermined current value or more in the connection circuit. It is characterized in that it is formed in a width that melts in the case of.

  The invention according to claim 4 is the power control apparatus according to claim 3, wherein the first conductor plate, the second conductor plate provided apart from the first conductor plate, A first connection wiring connecting the first AC input means and the first conductor plate; a second connection wiring connecting the first load circuit and the first conductor plate; and the second AC input means. A third connection wiring connecting the second conductor plate, a fourth connection wiring connecting the second load circuit and the second conductor plate, the first conductor plate and the second conductor; A first connection terminal formed on the first conductor plate to connect the plate, and a second conductor plate formed to connect the first conductor plate and the second conductor plate. The second connection terminal is further provided.

  The invention according to claim 5 is the power control apparatus according to any one of claims 1 to 4, further comprising a voltage conversion means between the first AC input means and the first load circuit. It is characterized by having.

  According to a sixth aspect of the present invention, there is provided a power control apparatus, comprising: a first AC input unit that is powered from a commercial power source; a second AC input unit that is powered from a commercial power source; a first load unit; A switching means for switching a connection destination of the first load means between the first AC input means and the second AC input means, and a second load circuit connected to the second AC input means.

  According to a seventh aspect of the present invention, there is provided the power control apparatus according to the sixth aspect, wherein the first load is detected in accordance with a voltage detection means for detecting a voltage of the commercial power source and a detection result by the voltage detection means. Switching control means for designating one of the first AC input means and the second AC input means as a connection destination of the means, and the switching means is connected to the connection destination designated by the switching control means and the first The load means is connected.

  The invention according to claim 8 is a power control apparatus, comprising: a first AC input means powered from a commercial power supply; a second AC input means powered from a commercial power supply; a first load means; A first connection means formed by connecting to the first load means; a second connection means formed by connecting to the first AC input means so as to be connectable to the first connection means; and the first connection means. And a third load means connected to the second AC input means, and a second load means connected to the second AC input means.

  The invention according to claim 9 is the power control apparatus according to claim 8, wherein the first connection means, the second connection means, and the third connection means are headers. .

  The invention according to claim 10 is the power control apparatus according to claim 8 or 9, wherein the first AC input means and the second AC input means are inlets.

  According to an eleventh aspect of the present invention, there is provided an image forming apparatus connected to the first AC input means supplied with power from a commercial power supply, second AC input means supplied with power from a commercial power supply, and the first AC input means. A first load circuit, a second load circuit connected to the second AC input means, and a connection to the second AC input means to connect the second AC input means and the first load circuit. And a second connection terminal formed to be connected to the first load circuit to connect the second AC input means and the first load circuit. .

  The invention according to a twelfth aspect is the image forming apparatus according to the eleventh aspect, wherein the first load circuit is a fixing heater, and a thermostat that opens and closes according to a temperature of the fixing heater; A first switching circuit that opens and closes between the first AC input means and the first load circuit according to opening and closing of a thermostat, and a second switching circuit that opens and closes between the second AC input means and the second load circuit according to opening and closing of the thermostat. And 2 open / close circuits.

  According to a thirteenth aspect of the invention, there is provided the image forming apparatus according to the eleventh or twelfth aspect, wherein an interlock switch for detecting opening / closing of a door of a housing in which the fixing heater is accommodated, and the interlock switch A first open / close circuit that opens and closes between the first AC input means and the first load circuit according to opening and closing, and an open and close between the second AC input means and the second load circuit according to opening and closing of the interlock switch. And a second opening / closing circuit.

  According to a fourteenth aspect of the present invention, there is provided an image forming apparatus, comprising: a first AC input unit powered by a commercial power source; a second AC input unit powered by a commercial power source; a first load unit; A switching means for switching a connection destination of the first load means between the first AC input means and the second AC input means, and a second load circuit connected to the second AC input means.

  According to a fifteenth aspect of the present invention, in the image forming apparatus, a first AC input unit powered by a commercial power source, a second AC input unit powered by a commercial power source, a first load unit, A first connection means formed by connecting to the first load means; a second connection means formed by connecting to the first AC input means so as to be connectable to the first connection means; and the first connection means. And a third load means connected to the second AC input means, and a second load means connected to the second AC input means.

  According to the first aspect of the present invention, the first load circuit connected to the first AC input means, the second load circuit connected to the second AC input means, and the second AC input means and the first load circuit are connected. The first connection terminal formed to be connected to the second AC input means and the second connection terminal formed to be connected to the first load circuit to connect the second AC input means and the first load circuit. Therefore, there is an effect that it can be used in common regardless of the voltage of the commercial power source.

  According to the invention of claim 2, the first region, the second region, and the first region and the second region are formed narrower than the first region and the second region, and are formed between the first region and the second region. In the printed wiring board having the third region formed, a conductive foil pattern is formed on the first region, the first load circuit connected to the first AC input means, and the conductive foil pattern is formed on the second region. A second load circuit connected to the second AC input means; a conductive foil pattern formed on the third region; and a connection circuit connecting the second AC input means and the first load circuit; and formed in the third region. Since the notch means formed to cut the connection circuit is provided, there is an effect that it can be used in common regardless of the voltage of the commercial power supply.

  According to the invention of claim 3, the conductive foil pattern of the connection circuit in the third region is formed to have a width that dissolves when a current of a predetermined current value or more flows in the connection circuit. Even when power is supplied from two AC input means without cutting the notch, the conductive foil pattern of the notch immediately melts, and the influence of the short circuit can be minimized.

  According to the invention of claim 4, the first connection wiring for connecting the first AC input means and the first conductor plate, and the second connection wiring for connecting the first load circuit and the first conductor plate. A third connection wiring for connecting the second AC input means and the second conductor plate, a fourth connection wiring for connecting the second load circuit and the second conductor plate, a first conductor plate and a second conductor In order to connect the first conductive plate, the first connection terminal formed on the first conductive plate, and the second conductive plate formed on the first conductive plate and the second conductive plate. Since the second connection terminal is provided, the common mode noise can be reduced.

  According to the invention of claim 5, since the voltage conversion means is further provided between the first AC input means and the first load circuit, it can be used in common regardless of the voltage of the commercial power supply. Play.

  According to the invention of claim 6, the switching means for switching the connection destination of the first load means between the first AC input means and the second AC input means, and the second load circuit connected to the second AC input means, Therefore, there is an effect that it can be used in common regardless of the voltage of the commercial power source.

  According to the seventh aspect of the present invention, the first AC input means and the second AC input means are connected as the connection destination of the first load means according to the voltage detection means for detecting the voltage of the commercial power source and the detection result by the voltage detection means. Since the switching control means for designating any one of these is provided, there is an effect that the switching can be automatically performed.

  According to the eighth aspect of the present invention, the first connection means formed by connecting to the first load means, and the first connection means formed to be connectable to the first AC input means so as to be connectable to the first connection means. 2 connection means, third connection means formed by connecting to the second AC input means so as to be connectable to the first connection means, and second load means connected to the second AC input means. There is an effect that it can be used in common regardless of the voltage of the power supply.

  According to the ninth aspect of the invention, since the first connecting means, the second connecting means, and the third connecting means are headers, there is an effect that the detaching operation can be facilitated.

  According to the tenth aspect of the invention, since the first AC input means and the second AC input means are inlets, the power cord can be easily detached.

  According to the eleventh aspect of the present invention, the first load circuit connected to the first AC input means, the second load circuit connected to the second AC input means, the second AC input means, and the first load circuit, To connect the second AC input means, and to connect the second AC input means and the first load circuit, and to connect the second load input circuit to the first load circuit. Since the connection terminal is provided, there is an effect that it can be used in common regardless of the voltage of the commercial power source.

  According to a twelfth aspect of the present invention, the first load circuit is a fixing heater, a thermostat that opens and closes in accordance with the temperature of the fixing heater, and the first AC input means and the first load circuit according to the opening and closing of the thermostat. A first open / close circuit that opens and closes the circuit and a second open / close circuit that opens and closes between the second AC input means and the second load circuit according to the opening and closing of the thermostat. The manufacturing cost can be reduced.

  According to the thirteenth aspect of the present invention, there is provided an interlock switch for detecting the opening / closing of the door of the casing in which the fixing heater is accommodated, and between the first AC input means and the first load circuit according to the opening / closing of the interlock switch. A first open / close circuit that opens and closes and a second open / close circuit that opens and closes between the second AC input means and the second load circuit according to the opening and closing of the interlock switch, so that the safety circuit can be shared, There is an effect that the manufacturing cost can be reduced.

  According to the invention of claim 14, the switching means for switching the connection destination of the first load means between the first AC input means and the second AC input means, and the second load circuit connected to the second AC input means, Therefore, there is an effect that it can be used in common regardless of the voltage of the commercial power source.

  According to the fifteenth aspect of the present invention, the first connection means formed by connecting to the first load means, and the first connection means formed to be connected to the first AC input means so as to be connectable to the first connection means. 2 connection means, third connection means formed by connecting to the second AC input means so as to be connectable to the first connection means, and second load means connected to the second AC input means. There is an effect that it can be used in common regardless of the voltage of the power supply.

  Exemplary embodiments of a power control apparatus and an image forming apparatus according to the present invention will be explained below in detail with reference to the accompanying drawings.

(First embodiment)
FIG. 1 is a diagram showing an AC power control circuit 100 in the image forming apparatus according to the first embodiment of the present invention. The AC power control circuit 100 has two AC power cords. That is, it has the 1st AC input part 1 which is an input part of the 1st AC power cord, and the 2nd AC input part 2 which is an input part of the 2nd AC power cord. The first AC input unit 1 is connected to the noise filter 4. The second AC input unit 2 is connected to a noise filter 5, a main power switch 11, and a normally closed relay 10.

  Further, a connection terminal 3 a is provided between the first AC input unit 1 and the noise filter 4. A connection terminal 3 b is provided between the second AC input unit 2, the noise filter 5, the main power switch 11 and the normally closed relay 10. The connection terminals 3a and 3b according to the present embodiment correspond to a first connection terminal and a second connection terminal, respectively.

  The first AC input unit 1 and the second AC input unit 2 are connected by connecting the connection terminal 3a and the connection terminal 3b. Thereby, when the connection terminal 3a and the connection terminal 3b are connected, electric power can be supplied to each load circuit from only one of the first AC input unit 1 and the second AC input unit 2. In this case, as shown in FIG. 2, an AC power cord not used for power supply may be removed. In the example shown in FIG. 2, the connection terminal 3a and the connection terminal 3b are connected by electric wires 300a and 300b, and the first AC input unit 1 is removed.

  The description returns to FIG. 1 again. In the AC power control circuit 100, power can be supplied from both the first AC input unit 1 and the second AC input unit 2. In this case, the connection terminal 3a and the connection terminal 3b need not be connected. Thus, by providing the connection terminal 3a and the connection terminal 3b, the manager of each apparatus can set the presence or absence of the connection of the connection terminal 3a and the connection terminal 3b.

  As described above, if the connection terminal 3a and the connection terminal 3b are not connected, power can be supplied from the first AC input unit 1 and the second AC input unit 2, so that the commercial power supply is 100 V as in Japan. If it is low, the device can be operated using the power supplied from the two power sources.

  On the other hand, in Europe, the commercial power source is 220 V, and the apparatus can be operated by supplying power from one commercial power source. In this case, the connection terminal 3a and the connection terminal 3b can be connected, and only one of the first AC input unit 1 and the second AC input unit 2 can be used. In this case, from the viewpoint of safety, it is desirable to remove the unused input units from the first AC input unit 1 and the second AC input unit 2 as described above.

  As described above, by providing the connection terminals 3a and 3b, an AC input unit for one power cord and an AC input unit for two power cords depending on the voltage difference of the commercial power source and the destination of the device. No need to remake. As a result, problems such as an increase in the number of parts required for remodeling and an increase in costs for manufacturing and management can be solved.

  Furthermore, as described above, the administrator of the apparatus may set whether or not the connection terminal 3a and the connection terminal 3b are connected according to the commercial power supply or the like, and can simplify the setting operation.

  Hereinafter, other configurations of the AC power control circuit 100 will be described. The noise filter 4 is connected to the relay 7 and the relay 8. The heating center heater 18 and the heating end heater 19 are controlled in accordance with the opening / closing output of the relay 7 input via the thermostat 17. The heating center heater 18 and the heating end heater 19 are provided in a fixing roller (not shown) of the fixing device, and heat the fixing roller.

  The thermostat 17 is a bimetal thermostat and is provided in the fixing device. When the fixing roller of the fixing device reaches a melting temperature, the switch part inside the thermostat 17 is opened. In the present embodiment, once the switch unit is opened, the thermostat 17 continues to keep open even if the temperature decreases. The thermostat 17 is connected in series to a heating central heater 18 and a heating end heater 19. Therefore, when the connection terminal 3a and the connection terminal 3b are connected as shown in FIG. 2, the power supplied from the second AC input unit 2 is supplied to the heating central heater 18 and the heating end heater 19. Blocked.

  The open / close output of the relay 8 is connected to the power supply circuit 22. The power supply circuit 22 includes two phototriacs (not shown). The power supply circuit 22 supplies power to the heating central heater 18 and the heating end heater 19 in accordance with a power supply signal from a control unit 26 (described later). The excitation coil of the relay 8 is supplied with electric power from the constant voltage power supply 25. Further, the power supply circuit 22 can be powered by turning on the switching circuit 12 by the control unit 26. The fixing temperature detection circuit 24 detects the fixing temperature heated by the thermistor 29 by the heating central heater 18 and the central end heater 19. The control unit 26 controls power supply in accordance with the fixing temperature detected by the fixing temperature detection circuit 24.

  A zero cross detection circuit 31 is connected to the noise filter 4. The control unit 26 can detect the presence or absence of power supply from the commercial power source to the first AC input unit 1 based on the output of the zero-cross detection circuit 31.

  On the other hand, the open / close circuit output of the normally closed relay 10 connected to the second AC input unit 2 is connected to the dehumidifying heater 28. Electric power is supplied from the constant voltage power supply 25 to the exciting coil of the normally closed relay 10. Therefore, when the main power switch 11 is turned off, power is supplied from the second AC input unit 2 to the dehumidifying heater 28. In addition, it is set as the structure which can supply electric power to the dehumidification heater 28 by turning off the switching circuit 14 by the control part 26. FIG.

  The noise filter 5 is connected to the double relay 9. One of the duplex relays 9 is connected to the pressure heater 21. The pressure heater 21 heats a pressure heater (not shown) in the fixing device. The other of the two relays 9 is connected to the power supply circuit 23. The power supply circuit 23 is configured by a phototriac (not shown). The power supply circuit 23 supplies power to the pressure heater 21 in response to a power supply signal from the control unit 26.

  Note that power is supplied from the constant voltage power supply 25 to the exciting coil of the double relay 9. Further, the power supply circuit 23 can supply power by turning on the switching circuit 13 by the control unit 26.

  The output side of the main power switch 11 is connected to the noise filter 6. The output of the noise filter 6 is connected to a constant voltage power supply 25 that generates a constant voltage. The constant voltage power supply 25 supplies power to the control unit 26, the DC load 27, the relay 10, the thermostat 16, and the like. Therefore, when the main power supply is turned on and the constant voltage power supply 25 generates a constant voltage, it is possible to operate normally including the load connected to the second AC input unit 2.

  The noise filter 4, the noise filter 6, and the noise filter 5 are suitable for noise reduction that matches the characteristics of the load circuit connected to each noise filter.

  In the AC power control circuit 100 according to the present embodiment, the maximum power amounts of the heating central heater 18 and the heating end heater 19 supplied with power from the first AC input unit 1 are set to 700 W, respectively. Therefore, the second AC input unit 2 can supply the remaining 600 W of power, which is obtained by subtracting a total of 1400 W from the total power of 2000 W. However, 1400 W is not always supplied, but the power supplied from the first AC input unit 1 and the second AC input unit 2 are supplied according to each operation state such as in the fixing start-up mode, copying, and standby. Control power. Specifically, control is performed so that the current of each of the first AC input unit 1 and the second AC input unit 2 is 15 A, and the total current of the first AC input unit 1 and the second AC input unit 2 does not exceed 20 A. The above processing is common regardless of whether or not the connection terminal 3a and the connection terminal 3b are connected.

  Further, as a configuration relating to a protection circuit and a safety circuit of the fixing device, a door switch 15 for detecting opening / closing of a door of a housing in which the fixing heater is accommodated, and a thermostat 16 are provided. The door switch 15 and the thermostat 16 are provided inside the fixing device. The door switch 15, the thermostat 16 and the constant voltage power supply 25 are directly connected.

  The exciting coils of the relay 7, the relay 8, and the double relay 9 are energized by electric power supplied via the thermostat 16 and the door switch 15. Therefore, when the door switch 15 is opened or when the internal switch of the thermostat 16 is opened due to the temperature rise of the fixing device, power is supplied to the heating central heater 18, the heating end heater 19, and the pressure heater 21. Is stopped. Further, the power supplied to the exciting coils of the relays 7 and 8 is cut off by the switching circuit 12 and the power supplied to the exciting coils of the double relay 9 is cut off by the switching circuit 13, thereby improving safety.

  FIG. 3 is a diagram for explaining the details of the operation of the CPU 26 a provided in the control unit 26. The temperature detection signal of the fixing temperature detection circuit 24 is input to the A / D converter 26c of the CPU 26a. The zero cross signal of the zero cross detection circuit 31 is input to the INT (interrupt terminal) 26b. A signal for detecting whether the door is open or the thermostat is open is input to the I / O port 26f.

  The I / O ports 26d and 26e output signals for ON / OFF control of the phototriac of the power supply circuit 22. The I / O port 26 i outputs a signal for ON / OFF control of the phototriac of the power supply circuit 23. The I / O port 26j outputs a signal for controlling the open / close circuit 12 that opens and closes energization of the exciting coils of the relays 7 and 8. The I / O port 26g outputs a signal for controlling the open / close circuit 13 for opening / closing the energization of the exciting coil of the double relay 9. The I / O port 26h outputs a signal for controlling the open / close circuit 14 for opening / closing the energization of the exciting coil of the relay 10.

  The CPU 26a detects the temperature of the output of the fixing temperature detection circuit 24 with the A / D converter 26c, and supplies power to the fixing heaters 18, 19, and 21 based on the detected temperature based on the interrupt signal of the zero cross signal. Determine the phase angle. And the signal which turns on each photo triac of the power supply circuit 22 and the power supply circuit 23 is output from I / O port 26d, 26e, 26i. When the fixing temperature reaches a preset temperature, a signal for turning off each photo triac of the power supply circuit 22 and the power supply circuit 23 is output.

  The CPU 26a outputs a signal for opening the open / close circuits 12 and 13 from the I / O ports 26g and 26j when the zero cross signal, the signal for detecting the door open or the opening of the thermostat is input to the I / O port 26f. Further, a signal for turning off each photo triac of the power supply circuit 22 and the power supply circuit 23 is output. The same applies when other AC power system abnormality is detected.

  As described above, the present invention has been described using the embodiment, but various changes or improvements can be added to the above embodiment.

  FIG. 4 is a diagram illustrating the AC power control circuit 102 according to the first modification. In addition to the configuration of the AC power control circuit 100 according to the first embodiment, the AC power control circuit 102 further includes a heating full width heater 20. The full width heater 20 heats the fixing roller of the fixing device in the same manner as the other heaters 18 and 19. The heating full width heater 20 is connected to the thermostat 17. Further, power is supplied from the power supply circuit 22. Thus, for example, when the commercial power source is 220 V and there is a power margin, a further load circuit may be added. In the example shown in FIG. 4, the connection terminal 3a and the connection terminal 3b are connected by electric wires 300a and 300b, and the first AC input unit 1 is removed.

  FIG. 5 is a diagram illustrating an AC power control circuit 104 according to a second modification. The AC power control circuit 104 has three AC inputs 1, 2, and 35. The second AC input unit 2 is connected to the main power switch 11. A connection terminal 36 a for connecting the second AC input unit 2 and the third AC input unit 35 is provided between the second AC input unit 2 and the main power switch 11.

  The third AC input unit 35 is connected to the noise filter 5. A connection terminal 36 b for connecting the second AC input unit 2 and the third AC input unit 35 is provided between the third AC input unit 35 and the noise filter 5.

  Thus, since the 2nd AC input part 2 and the 3rd AC input part 35 can be connected by an electric wire etc., the electric power supplied only from any one can be supplied to each load circuit. Further, when each of the second AC input unit 2 and the third AC input unit 35 is connected to a commercial power supply, the connection terminal 36a and the connection terminal 36b are not connected, and power is supplied from each AC input unit to each load circuit. be able to.

  Note that the connection terminal 3a and the connection terminal 3b may be connected and the connection terminal 36a and the connection terminal 36b may be opened according to the power capacity of the commercial power supply. The connection terminal 3a and the connection terminal 3b may be opened, and the connection terminal 36a and the connection terminal 36b may be connected. Moreover, you may connect both circuits. Both circuits may be opened. Thus, whether or not each connection unit is connected can be set according to the voltage value of the commercial power source to be used.

  In this example, a heating central heater 18 and a heating end heater 19 are connected to the first AC input unit 1 as a load circuit. The second AC input unit 2 is connected to a constant voltage power supply 25 as a load circuit, a control unit 26, and a DC load circuit 27 that performs an image forming operation. A dehumidifying heater 28 is connected to the third AC input unit 35 as a load circuit. Further, the pressure heater 21, the heating full width heater 20, and the AC outlet 37 are connected via the double relay 9. The outlet 37 is connected to the peripheral unit 38.

  As a third modification, the AC power control circuit 104 may further include an AC voltage detection circuit that detects the voltage of the second AC input unit 2. In this case, if it is found from the detection result by the AC voltage detection circuit that there is a margin in power, the fixing heaters may be fully turned on and the fixing rise time may be shortened.

  FIG. 6 is a diagram illustrating an AC power control circuit 106 according to a fourth modification. The AC power control circuit 106 according to this example further includes a voltage conversion transformer 90 between the first AC input unit 1 and the noise filter 4. The voltage conversion transformer 90 converts the voltage from 200V to 100V. Thereby, when using 200V commercial power supply, a voltage can be converted from 200V to 100V.

(Second Embodiment)
FIG. 7 is a diagram illustrating an AC power control circuit 110 according to the second embodiment. The AC power control circuit 110 according to the first embodiment includes a changeover switch 32 instead of the connection terminals 3a and 3b. Terminals 32 a and 32 b of the changeover switch 32 are connected to the first AC input unit 1. The terminals 32 c and 32 d are connected to the second AC input unit 2. The terminals 32e and 32f are connected to the noise filter 4.

  When the terminals 32a and 32b and the terminals 32e and 32f are connected, the power of the first AC input unit 1 is supplied to the heating central heater 18 and the heating end heater 19 through the noise filter 4 and the like. On the other hand, since the 2nd AC input part 2 and the noise filter 4 are not connected, the electric power of the 2nd AC input part 2 is supplied to the pressurization heater 21 and the dehumidification heater 28 etc. via the noise filter 5 grade | etc.,.

  When the terminals 32c and 32d and the terminals 32e and 32f are connected, the first AC input unit 1 and the noise filter 4 are not connected, and the second AC input unit 2 and the noise filter 4 are connected. Is done. Therefore, the power of the second AC input unit 2 is supplied to the heating central heater 18, the heating end heater 19, the pressurizing heater 21, and the dehumidifying heater 28. That is, power is supplied only to the second AC input unit 2 to all load circuits.

  As described above, the AC power control circuit 110 according to the second embodiment can operate as a circuit that uses only power from one AC input unit by switching the changeover switch 32, and two It can also operate as a circuit that uses power from the AC input section. Therefore, it is possible to provide a circuit capable of supplying power in accordance with the voltage value of the commercial power supply, the destination of the apparatus, and the like by a simple operation for switching the connection of the changeover switch 32.

  In the AC power control circuit 110 according to the second embodiment as well, it is desirable to remove the first AC input unit 1 when operating as a circuit that uses power from only the second AC input unit 2. However, even if the first AC input unit 1 is left and the first AC power cord is connected to the commercial power source, the commercial power source is short-circuited because the switch 32 is not connected to the second AC input unit 2. Never do.

  As shown in FIG. 7, the AC power control circuit 110 according to the second embodiment does not include the switching circuits 12, 13, and 14, but may be configured to include these. The other configuration of the AC power control circuit 110 according to the second embodiment is the same as the configuration of the AC power control circuit according to the other embodiments.

(Third embodiment)
FIG. 8 is a diagram illustrating an AC power control circuit 120 according to the third embodiment. The AC power control circuit 120 includes a relay 33 that switches the connection destination of the noise filter 4 between the first AC input unit 1 and the second AC input unit 2. Terminals 33 a and 33 b of the relay 33 are connected to the first AC input unit 1. The terminals 33 c and 33 d are connected to the second AC input unit 2. The terminals 33e and 33f are connected to the noise filter 4.

  An AC voltage detection circuit 34 is provided between the noise filter 5 and the control unit 26. The AC voltage detection circuit 34 detects the voltage of the second AC input unit 2. That is, the voltage of the commercial power supply is detected. The relay 33 switches between the first AC input unit 1 and the second AC input unit 2 in accordance with the detected voltage. The relay 33 according to the present embodiment corresponds to a switching unit and a switching control unit.

  The analog signal output from the AC voltage detection circuit 34 is input to the A / D converter 26 c of the CPU 26 a of the control unit 26. When the A / D converter 26c detects a 220V or 115V commercial power supply, the CPU 26a outputs a signal for switching the terminals 33c and 33d and the terminals 33e and 33f to be connected (energizing the excitation coil) from the I / O port. . When the A / D converter 26c detects a commercial power supply voltage of 100 V, a signal for switching the terminals 33a and 33b and the terminals 33e and 33f to be connected (energization coil energization OFF) is output from the I / O port. The relay 33 switches the connection according to this output. It should be noted that the terminals 33a and 33b and the terminals 33e and 33f are connected at the default (when the excitation coil is energized OFF) when the main power switch 11 is turned on.

  As described above, the AC power control circuit 120 according to the third embodiment can operate as a circuit that uses only power from one AC input unit by switching the relay 33, and two AC power control circuits 120 can be operated. It can also operate as a circuit that uses power from the input unit. Therefore, it is possible to provide a circuit according to the voltage value of the commercial power supply, the destination of the apparatus, and the like by only a simple operation for switching the connection of the relay 33.

  Furthermore, since the relay 33 is automatically switched according to the voltage detected by the AC voltage detection circuit 34, the apparatus setting process can be simplified.

  FIG. 9 is a diagram illustrating the AC voltage detection circuit 34. The full-wave rectifier circuit 34a converts the voltage into a DC voltage and smoothes it by a smoothing capacitor C1. Further, the voltages are divided by the resistors R1 and R2, and these are detected by the A / D converter 26c.

  The remaining configuration of the AC power control circuit 120 according to the third embodiment is the same as the configuration of the AC power control circuit according to the other embodiments.

(Fourth embodiment)
FIG. 10 is a diagram illustrating an AC power control circuit 130 according to the fourth embodiment. A part of the AC power control circuit 130 is formed on a printed wiring board (hereinafter referred to as PCB). PCB 40 is a single-sided board, and a conductive foil pattern is formed on the solder surface.

  The PCB 40 is formed on the two conductor plates 64 and 65. The conductor plates 64 and 65 are electrically connected to the housing of the image forming apparatus (not shown). The conductor plates 64 and 65 become a frame GND (Ground). The conductor plates 64 and 65 correspond to a first conductor plate and a second conductor plate, respectively. The PCB 40 has a third region between the first region on the conductor plate 64 and the second region on the conductor plate 65. The conductor plate 64 and the conductor plate 65 are provided to be separated from each other, and the third region is disposed in the separated portion. The third region is formed narrower than the first region and the second region.

  Further, connection terminals 64a and 65a for connecting the FG connection line 58 are formed on the conductor plate 64 and the conductor plate 65, respectively. In this way, common mode noise can be reduced in the conductor plate 64 and the conductor plate 65 by connecting the FG connection line 58. The connection terminals 64a and 65a according to the present embodiment correspond to a first connection terminal and a second connection terminal, respectively.

  A first inlet 41 is formed on the conductor plate 64. The first inlet 41 is connected to the noise filter circuit 45 via the electric wires 42a and 42b. Further, the first inlet 41 is connected to the frame GND 56 via the ground wire 47. The noise filter circuit 45 is connected to the noise filter GND 62. The noise filter GND 62 is connected to an FG (Frame Ground) connection line 61. The ground line 47 and the FG connection line 61 according to the present embodiment correspond to a first connection line and a second connection line, respectively.

  A second inlet 66 is formed in the conductor plate 65. The second inlet 66 is connected to the noise filter circuit 46 and the noise filter GND 63 via electric wires 69a and 69b. The second inlet 66 is connected to the frame GND 57 via the ground wire 59. The noise filter GND 63 is connected to the FG connection line 60. The noise filter circuits 45 and 46 constitute a circuit on the PCB 40. The ground wire 59 and the FG connection line 60 according to the present embodiment correspond to a third connection line and a fourth connection line, respectively.

  As described above, since the inlets 41 and 66 are used as the AC input unit, the AC power cord can be easily attached and detached. In addition, the inlets 41 and 66 are common in the 100V power cord and the 200V power cord. Therefore, by changing to the power cord corresponding to the voltage, it is possible to easily cope with the facility status of the commercial power source.

  The first inlet 41 and the second inlet 66 are connected by jumper wires 43 and 44. The jumper wires 43 and 44 are connected on the component side. Thereby, it is possible to supply power to all the load circuits from only one of the first inlet 41 and the second inlet 66. That is, the AC power control circuit 130 can be used as a circuit that supplies power from only one AC input unit.

  Further, a notch 67 is formed in a third region of the PCB 40, that is, a region corresponding to the separated portion of the conductor plates 64 and 65. FIG. 11 is a cross-sectional view of the notch 67. Thus, the groove | channel is formed in two places. Therefore, it can be easily cut by applying pressure to the notch 67. In addition, when the PCB 40 is cut by the notch 67, the FG connection line 58 is removed.

  Thus, by cutting the notch portion 67, the connection between the first inlet 41 and the second inlet 66 is eliminated, so that power can be supplied from each inlet 41, 66 to the corresponding load circuit. That is, the AC power control circuit 130 can be used as a circuit that uses two AC input units.

  Further, when power is supplied via the power cord connected to the first inlet 41 and the power cord connected to the second inlet 66 without cutting the PCB 40, the cut-out portion 67 is caused by the short-circuit current. A part 68 of the conductive foil is formed so as to melt. Thereby, when a short circuit occurs, it can cut | disconnect rapidly. Thereby, it can prevent that the influence of a short circuit expands to another part.

  The remaining configuration of the AC power control circuit 130 according to the fourth embodiment is the same as the configuration of the AC power control circuit according to the other embodiments.

(Fifth embodiment)
FIG. 12 is a diagram illustrating an AC power control circuit 140 according to the fifth embodiment. In the AC power supply control circuit 140 according to the fifth embodiment, two headers 51 and 52 are provided between the first inlet 41 and the noise filter circuit 45. Further, a header 50 is provided between the second inlet and the noise filter circuit 45.

  FIG. 13 is a diagram showing the headers 50 to 52 and the connecting wire bundle 49 attached to the headers 50 to 52. The headers 50 to 52 correspond to first to third connection units, respectively. The connecting wire bundle 49 has housings 53a and 53b. As shown in FIG. 13, when the housings 53a and 53b are connected to the header 52 and the header 51, respectively, the first inlet 41 and the noise filter circuit 45 are connected, and the load circuit corresponding to the first inlet 41 has the first Electric power from the inlet 41 is supplied. Further, in this case, since the housing 53 is not connected to the header 50, the second inlet 66 supplies power only to the corresponding load circuit.

  Thus, by connecting the housings 53a and 53b to the header 52 and the header 51, respectively, the AC power control circuit 140 can be used as a circuit using two AC input units.

  When the housing 53a is connected to the header 50 instead of the header 52, the first inlet 41 and the noise filter circuit 45 are not connected, and the second inlet 66 and the noise filter circuit 45 are connected. Thus, by connecting the housings 53a and 53b to the header 50 and the header 51, the AC power control circuit 140 can be used as a circuit that uses one AC input unit.

  The remaining configuration of the AC power control circuit 140 according to the fifth embodiment is the same as that of the AC power control circuit according to the other embodiments.

(Sixth embodiment)
FIG. 14 is a diagram illustrating an AC power control circuit 150 according to the sixth embodiment. In the AC power supply control circuit 150 according to the sixth embodiment, the first AC power cord 81 having the first AC input unit is connected to the connection round terminals 84 a and 84 b of the relay terminal block 83. Further, the noise filter 87 is connected to the corresponding connection flat terminals 85a and 85b of the relay terminal block 83 via the electric wires 86a and 86b. With this configuration, power is supplied from the first power cord 81 to the noise filter 87.

  Further, the second AC power cord 82 having the second AC input section is connected to the connection round terminals 84 c and 84 d of the relay terminal block 83. The noise filter 88 is connected to the corresponding connection flat terminals 85c and 85d of the relay terminal block 83 via the electric wires 86c and 86d. With this configuration, power is supplied from the second power cord 82 to the noise filter 88. With the above configuration, power can be supplied from two commercial power sources.

  FIG. 15 is a diagram illustrating an AC power control circuit 150 in a usage mode in which power is supplied from only one commercial power source. As shown in FIG. 15, when only the first power cord 81 is used, the second power cord 82 is removed. Then, the connection electric wires 70a and 70b are connected to the connection round terminals 84c and 84d to which the second power cord 82 has been connected. Furthermore, the other ends of the connection wires 70a and 70b are connected to connection flat terminals 85a and 85b, respectively. As a result, only one of the power cords can be connected to the noise filters 87 and 88.

  The remaining configuration of the AC power control circuit 150 according to the sixth embodiment is the same as the configuration of the AC power control circuit according to the other embodiments.

1 is a diagram illustrating an AC power control circuit 100. FIG. It is a figure which shows the state in which the connection terminal 3a and the connection terminal 3b were connected. 7 is a diagram for explaining details of an operation of a CPU 26a provided in the control unit 26. FIG. It is a figure which shows AC power control circuit 102 concerning the 1st modification. It is a figure which shows AC power control circuit 104 concerning the 2nd modification. It is a figure which shows AC power control circuit 106 concerning the 4th modification. It is a figure which shows AC power control circuit 110 concerning 2nd Embodiment. It is a figure which shows AC power control circuit 120 concerning 3rd Embodiment. 3 is a diagram illustrating an AC voltage detection circuit 34. FIG. It is a figure which shows AC power control circuit 130 concerning 4th Embodiment. FIG. 6 is a cross-sectional view of a cutout portion 67. It is a figure which shows AC power control circuit 140 concerning 5th Embodiment. It is a figure which shows the electric wire bundle 49 attached to header 50-52 and header 50-52. It is a figure which shows AC power control circuit 150 concerning 6th Embodiment. It is a figure which shows the AC power control circuit 150 in the case of the utilization form which supplies electric power only from one commercial power supply.

Explanation of symbols

1, 2, 35 AC input section 3a, 3b, 36a, 36b Connection terminal 4, 5, 6 Noise filter 7, 8 Relay 9 Dual relay 10 Normal close relay 11 Main power switch 12, 13, 14 Open / close circuit 15 Door switch 16, 17 Thermostat 18 Heating central heater 19 Heating end heater 20 Heating full width heater 21 Pressurizing heater 22, 23 Power supply circuit 24 Fixing temperature detection circuit 25 Constant voltage power supply 27 DC load circuit 28 Dehumidification heater 29 Thermistor 31 Zero cross detection circuit 32 Switch 33 Relay 34 AC voltage detection circuit 37 Outlet 38 Peripheral machine 40 Printed wiring board 41, 66 Inlet 42a, 42b Electric wire 43, 44 Jumper wire 45, 46 Noise filter circuit 47 Ground wire 49 Connection power Bundle 50-52 Header 53a, 53b Housing 58 FG connection wire 59 Ground wire 60, 61 FG connection wire 64, 65 Conductor plate 67 Notch 68a, 68b Wire 70a, 70b Connection wire 81, 82 Power cord 83 Relay terminal block 84a to 84d Connection round terminal 85a to 85d Connection flat terminal 86a to 86d Electric wire 87, 88 Noise filter 90 Voltage conversion transformer 100, 102, 104, 106, 110, 120, 130, 140, 150 AC power control circuit 300a, 300b electric wire

Claims (15)

First AC input means powered by a commercial power source;
A second AC input means powered from a commercial power source;
A first load circuit connected to the first AC input means;
A second load circuit connected to the second AC input means;
A first connection terminal formed in connection with the second AC input means for connecting the second AC input means and the first load circuit;
A power control apparatus comprising: a second connection terminal formed to be connected to the first load circuit so as to connect the second AC input means and the first load circuit. First AC input means powered by a commercial power source;
A second AC input means powered from a commercial power source;
A first region; a second region; and a third region formed narrower than the first region and the second region and formed between the first region and the second region. A printed wiring board;
A first load circuit formed in a conductive foil pattern on the first region and connected to the first AC input means;
A second load circuit formed in a conductive foil pattern on the second region and connected to the second AC input means;
A connection circuit formed in a conductive foil pattern on the third region, and connecting the second AC input means and the first load circuit;
A power control device comprising: notch means formed in the third region and formed to cut the connection circuit.   3. The electric power according to claim 2, wherein the conductive foil pattern of the connection circuit in the third region is formed to have a width that dissolves when a current of a predetermined current value or more flows through the connection circuit. Control device. A first conductor plate;
A second conductor plate provided apart from the first conductor plate;
A first connection wiring connecting the first AC input means and the first conductor plate;
A second connection wiring connecting the first load circuit and the first conductor plate;
A third connection wiring connecting the second AC input means and the second conductor plate;
A fourth connection wiring connecting the second load circuit and the second conductor plate;
A first connection terminal formed on the first conductor plate for connecting the first conductor plate and the second conductor plate;
The electric power according to claim 3, further comprising a second connection terminal formed on the second conductor plate for connecting the first conductor plate and the second conductor plate. Control device.   5. The power control apparatus according to claim 1, further comprising a voltage conversion unit between the first AC input unit and the first load circuit. 6. First AC input means powered by a commercial power source;
A second AC input means powered from a commercial power source;
First loading means;
Switching means for switching a connection destination of the first load means between the first AC input means and the second AC input means;
A power control apparatus comprising: a second load circuit connected to the second AC input means. Voltage detecting means for detecting the voltage of the commercial power supply;
According to a detection result by the voltage detection means, further comprising a switching control means for designating one of the first AC input means and the second AC input means as a connection destination of the first load means,
The power control apparatus according to claim 6, wherein the switching unit connects the connection destination specified by the switching control unit and the first load unit. First AC input means powered by a commercial power source;
A second AC input means powered from a commercial power source;
First loading means;
First connection means formed in connection with the first load means;
A second connection means formed to be connected to the first AC input means so as to be connectable to the first connection means;
A third connecting means formed to be connected to the second AC input means so as to be connectable to the first connecting means;
And a second load means connected to the second AC input means.   The power control apparatus according to claim 8, wherein the first connection means, the second connection means, and the third connection means are headers.   The power control apparatus according to claim 8 or 9, wherein the first AC input means and the second AC input means are inlets. First AC input means powered by a commercial power source;
A second AC input means powered from a commercial power source;
A first load circuit connected to the first AC input means;
A second load circuit connected to the second AC input means;
A first connection terminal formed in connection with the second AC input means for connecting the second AC input means and the first load circuit;
An image forming apparatus comprising: a second connection terminal connected to the first load circuit for connecting the second AC input means to the first load circuit. The first load circuit is a fixing heater,
A thermostat that opens and closes according to the temperature of the fixing heater;
A first switching circuit that opens and closes between the first AC input means and the first load circuit in accordance with opening and closing of the thermostat;
The image forming apparatus according to claim 11, further comprising a second opening / closing circuit that opens / closes between the second AC input unit and the second load circuit according to opening / closing of the thermostat. An interlock switch for detecting opening and closing of a door of a housing in which the fixing heater is housed;
A first switching circuit that opens and closes between the first AC input means and the first load circuit in accordance with opening and closing of the interlock switch;
The image forming apparatus according to claim 11, further comprising a second opening / closing circuit that opens / closes between the second AC input unit and the second load circuit according to opening / closing of the interlock switch. First AC input means powered by a commercial power source;
A second AC input means powered from a commercial power source;
First loading means;
Switching means for switching a connection destination of the first load means between the first AC input means and the second AC input means;
An image forming apparatus comprising: a second load circuit connected to the second AC input unit. First AC input means powered by a commercial power source;
A second AC input means powered from a commercial power source;
First loading means;
First connection means formed in connection with the first load means;
A second connection means formed to be connected to the first AC input means so as to be connectable to the first connection means;
A third connecting means formed to be connected to the second AC input means so as to be connectable to the first connecting means;
An image forming apparatus comprising: a second load unit connected to the second AC input unit.

Images