JP2012040748A - Information processor and information processing program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure and indicate power consumption correctly.SOLUTION: The range is adjusted by controlling on/off of the conduction state of a plurality of resistors Ra, Rb, Rc provided in an amplification circuit 48 by means of switches S1, S2. When turning on/off the switches in order to select a range, on/off control of the switches S1, S2 is performed according to the state of an image forming apparatus when a power conversion section 44 acquires the state information because power consumption is known previously for every state of the image forming apparatus thus pre-selecting a range for measurement of power consumption.

Description

  The present invention relates to an information processing apparatus and an information processing program.

  In the technique described in Patent Document 1, in an image forming apparatus having a plurality of modes such as a copy mode and a print mode, the operation time for each operation mode is measured and stored as time data. It has been proposed to create log information by calculating the power consumption for each operation mode based on the time data and the estimated power consumption for each mode.

JP 2004-330639 A

  An object of the present invention is to accurately and quickly measure and display power consumption.

  The information processing apparatus according to claim 1, wherein the measurement range by the measurement unit is set so that the measurement range becomes a predetermined range for each state of the measurement unit that measures power consumption and each of the devices having different power consumptions. It is characterized by comprising adjusting means for adjusting, and display means for calculating and displaying the amount of power consumption from the measurement result of the measuring means measured in the measuring range adjusted by the adjusting means.

  According to a second aspect of the present invention, in the first aspect of the present invention, each of the predetermined measurement ranges is a state of the device obtained from a result measured in advance using a power meter for each state of the device. It is characterized in that the average value of each power is determined in advance so as to be in the center of the measurement range.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, each of the predetermined measurement ranges is obtained from a result measured in advance using a wattmeter for each state of the device. It is characterized in that it is predetermined so that the amount of change can be accommodated.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the adjustment means is for amplification in an amplification circuit for amplifying a signal representing a measurement result of the measurement means. The measuring range by the measuring means is adjusted by adjusting the resistance value.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the display means excludes a measurement result out of a measurement range from the measurement result and calculates the electric energy. It is characterized by calculating and displaying.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the display unit calculates the power amount from an average value of power consumption excluding the measurement result out of the measurement range from the measurement result. It is characterized by being displayed.

  According to a seventh aspect of the present invention, in the invention according to the fifth or sixth aspect, the display means calculates the power amount by obtaining an average value of power consumption for each predetermined number of the measurement results. When the predetermined number of measurement results are all outside the measurement range, the power amount calculated last time is displayed.

  The invention according to claim 8 is the invention according to claim 5 or 6, wherein the display means calculates the power amount by obtaining an average value of power consumption for each predetermined number of the measurement results. When a predetermined number of measurement results are all outside the measurement range, it is determined that the measurement is abnormal and a message indicating that the measurement result is abnormal is displayed.

  An information processing program according to claim 9 is configured so that a measurement range becomes a predetermined range for each state of an apparatus in which an acquisition step of acquiring a measurement result of a measuring unit that measures power consumption and each of the power consumptions are different. An adjustment step for adjusting the measurement range by the adjustment means for adjusting the measurement range by the measurement means, and a measurement result obtained by the measurement means measured in the measurement range adjusted in the adjustment step, acquired in the acquisition step. And a display step of calculating the amount of electric power and displaying it on the display unit.

  According to a tenth aspect of the present invention, in the ninth aspect of the invention, each of the predetermined measurement ranges is a state of the device obtained from a result measured in advance using a power meter for each state of the device. It is characterized in that the average value of each power is determined in advance so as to be in the center of the measurement range.

  According to an eleventh aspect of the present invention, in the invention according to the ninth or tenth aspect, each of the predetermined measurement ranges is a change obtained from a result measured in advance using a wattmeter for each state of the apparatus. It is characterized by being predetermined so that the amount can be accommodated.

  According to a twelfth aspect of the present invention, in the invention according to any one of the ninth to eleventh aspects, the adjusting step is for amplification in an amplifier circuit for amplifying a signal representing a measurement result of the measuring means. The measuring range by the measuring means is adjusted by adjusting the resistance value.

  The invention according to a thirteenth aspect is the invention according to any one of the ninth to twelfth aspects, wherein the display step excludes a measurement result out of a measurement range from the measurement result, and calculates the electric energy. It is calculated and displayed on the display unit.

  According to a fourteenth aspect of the present invention, in the invention according to the thirteenth aspect, the display step calculates the electric energy from an average value of power consumption excluding a measurement result out of a measurement range from the measurement result. Display on the display unit.

  According to a fifteenth aspect of the present invention, in the invention according to the thirteenth or fourteenth aspect, the display step calculates the power consumption by obtaining an average value of power consumption for each predetermined number of the measurement results. When the predetermined number of measurement results are all outside the measurement range, the power amount calculated last time is displayed on the display unit.

  According to a sixteenth aspect of the present invention, in the invention according to the thirteenth or fourteenth aspect, the display step calculates the power consumption by obtaining an average value of power consumption for each predetermined number of the measurement results. When a predetermined number of the measurement results are all outside the measurement range, it is determined that the measurement result is abnormal and a message indicating that the measurement result is abnormal is displayed on the display unit.

  According to the first and ninth aspects of the invention, as compared with the case where there is no configuration for adjusting the measurement range for each state of the apparatus, the range adjustment is not required, so that the power consumption can be measured quickly and accurately. There is an effect that it can be displayed.

  According to the second and tenth aspects of the present invention, it is not necessary to adjust the center after the range adjustment, compared to the case where the measurement range is not set in advance so that the average value obtained from the pre-measured result is in the center. Therefore, there is an effect that the measurement range can be quickly adjusted to an appropriate range.

  According to the third and eleventh aspects of the invention, there is an effect that it can be prevented from going out of the measurement range.

  According to the fourth and twelfth aspects of the present invention, there is an effect that the measurement range can be adjusted at a lower cost than the case where the configuration for adjusting the resistance value of the amplifying resistor is not provided.

  According to the invention described in claims 5, 6, 7, 13, 14, and 15, there is an effect that the power consumption can be displayed by removing noise.

  According to the invention described in claims 8 and 16, there is an effect that an abnormality can be notified.

1 is a diagram illustrating a schematic configuration of an image forming apparatus according to an embodiment of the present invention. 1 is a block diagram illustrating a configuration of a power supply system of an image forming apparatus according to an embodiment of the present invention. 3 is a block diagram illustrating a configuration example for displaying power consumption of an operation display unit in the image forming apparatus according to the embodiment of the present invention. FIG. (A) is a figure which shows the table which shows an example of the correspondence of primary side apparent electric power and primary side power consumption, (B) is a figure which shows the number of operation | movement and working load of the low power supply part for every structure. FIG. 4 is a diagram illustrating an example of a table in which switches that are turned on and off are predetermined for each state of the image forming apparatus. 6 is a flowchart illustrating an example of a flow of power consumption display processing performed by an operation display unit of the image forming apparatus according to the embodiment of the present invention. It is a flowchart which shows an example of the flow of the process of the primary side power consumption calculation performed in a power consumption calculation part.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of an image forming apparatus 10 according to an embodiment of the present invention.

  The image forming apparatus 10 according to the embodiment of the present invention includes a main controller 18 as shown in FIG.

  The main controller 18 includes a CPU (Csentral Processing Unit) 18A, a ROM (Read Only Memory) 18B, a RAM (Random Access Memory) 18C, a nonvolatile memory 18D, and an input / output interface (I / O) 18E via a bus 18F. Each is connected.

  The I / O 18E includes an operation display unit 20, an image reading unit 22, an image forming unit 24, a paper supply unit 26, a paper discharge unit 28, a telephone line interface (I / F) 30, a network interface (I / F) 32, The functional units of the hard disk 34 and the power saving control device 36 are connected.

  The operation display unit 20 includes various buttons such as a start button for instructing start of copying, various buttons such as a numeric keypad, a setting screen for setting processing contents such as image forming conditions such as copy density, and the state of the apparatus. A touch panel for displaying a screen is included.

  The image reading unit 22 includes an image reading sensor such as a line CCD, a scanning mechanism for scanning the image reading sensor, a moving mechanism for moving the document to a reading position, and the like. Read the image. The image reading unit 22 can perform automatic reading by moving a document to a reading position by a moving mechanism and manual reading by a user setting and reading a document at the document reading position.

  The image forming unit 24 forms an image on a recording medium by, for example, a so-called electrophotographic method. Specifically, the image forming unit 24 is a charging device for charging the photosensitive drum, and exposes light corresponding to the image onto the charged photosensitive drum, thereby static electricity corresponding to the image on the photosensitive drum. An exposure device that forms an electrostatic latent image, a developing device that develops toner with an electrostatic latent image formed on a photosensitive drum, and a transfer device that transfers a toner image corresponding to the image formed on the photosensitive drum to a recording medium The image forming apparatus includes a fixing device that fixes a toner image corresponding to an image transferred to a recording medium, an image formation information processing unit that processes image information for image formation, and the like. As the exposure apparatus, an optical scanning apparatus including an optical system such as a semiconductor laser, a rotary polygon mirror, a collimator lens, a cylindrical lens, and an fθ lens, an LED head composed of a plurality of LEDs, and the like can be applied. . Further, the image forming unit 24 is not limited to the electrophotographic system, and may be an apparatus that forms an image on a recording medium by an ink jet recording system.

  The paper supply unit 26 includes a paper storage unit that stores recording paper, a supply mechanism that supplies recording paper from the paper storage unit to the image forming unit 24, and the like. A plurality of paper storage units are provided to store recording papers of different types of recording paper, and a plurality of supply mechanisms are provided corresponding to the paper storage units.

  The paper discharge unit 28 is a finisher that performs post-processing such as stapling processing and punching processing on the recording paper, a discharge unit that discharges the recording paper, and a recording paper that has been image-formed by the image forming unit 24. It is configured to include a discharge mechanism for discharging upward.

  The telephone line I / F 30 is an interface for performing facsimile communication with other image forming apparatuses connected via a telephone line (not shown).

  The network I / F 32 is an interface for data communication with other devices such as a host computer via communication means such as a network.

  The hard disk 34 stores, for example, log data such as the status and operating status of each part of the apparatus, log data of processing results such as copying, facsimile communication, and printing, various setting data, control programs, and the like.

  The power saving control device 36 controls the power supply unit 38 according to the processing content instructed to be executed by the operation display unit 20, and controls the power supplied to each function unit necessary for executing the processing content. .

  The power supply unit 38 controls the main controller 18, the operation display unit 20, the image reading unit 22, the paper supply unit 26 supply mechanism, the paper discharge unit 28 discharge mechanism, and the paper discharge unit 28 according to the control of the power saving control device 36. Turns on / off the power supply to each functional unit such as the finisher and the discharge mechanism.

  In other words, in the image forming apparatus 10 of the present embodiment, the power saving control device 36 controls the power supply unit 38 so as to supply power only to necessary function units and to save power for unnecessary function units. For example, in the case of print processing, it is not necessary to supply power to the image reading unit 22, and power is saved accordingly. Also, in the case of copy processing, for example, if the display of the operation display unit 20 is stopped when a copy operation is instructed after an operation of the operation display unit 20 is instructed to start copying, the power can be reduced accordingly. Saved.

  As described above, depending on the type of image forming process, it is not necessary to supply power to all the functional units, and partial power saving can be achieved by stopping power supply to unnecessary portions.

  FIG. 2 is a block diagram showing the configuration of the power supply system of the image forming apparatus 10 according to the embodiment of the present invention.

  Specifically, as shown in FIG. 2, the above-described power supply unit 38 includes a plurality of low power supply units 14A and 14B that are supplied with different voltages, and each of the low power supply units 14A and 14B has an AC power supply. Is converted into a DC power supply to supply power to each functional unit. In FIG. 2, the two low power supply units 14 </ b> A and 14 </ b> B are shown as an example, but are not limited to two, and are provided according to the rated voltage of each functional unit.

  Each of the low power supply units 14A and 14B includes a switching element and the like, and by turning on and off the switching element, the AC power obtained from the commercial power source is converted into a DC power source having a predetermined voltage to each functional unit. Supply power.

  In FIG. 2, the image reading unit 22 is connected to the low power supply unit 14A, and the AC power is converted to a DC power source having a predetermined voltage to supply power to the image reading unit 22, and the low power supply unit 14B. Is connected to the image processing unit in the image forming unit 24, the main controller 18, and the power saving control device 36, and converts the AC power into a DC power having a predetermined voltage different from that of the low power supply 14A. Then, power is supplied to the image forming unit 24, the main controller 18, and the power saving control device 36. Note that the low power supply unit that supplies power to other functional units (paper supply unit 26, paper discharge unit 28, telephone line I / F 30, network I / F 32, hard disk 34, power saving control device 36, etc.) The description is omitted.

  Further, a current transformer 12 for measuring power is connected between the commercial power supply and the low power supply units 14A and 14B. The current transformer 12 is connected to the operation display unit 20 via the effective value conversion circuit 16, and the current and voltage obtained from the current transformer 12 are converted into effective values by the effective value conversion circuit 16. The operation display unit 20 has a function of A / D converting the analog signal obtained from the effective value conversion circuit 16 to obtain power consumption to calculate the amount of power, and displaying the calculated power consumption on the operation display unit 20. I have.

  Here, a configuration for displaying the power consumption of the operation display unit 20 will be described. FIG. 3 is a block diagram illustrating a configuration example for displaying the power consumption of the operation display unit 20 in the image forming apparatus 10 according to the embodiment of the present invention.

  As shown in FIG. 3, the operation display unit 20 includes an amplification circuit 48, an A / D conversion unit 40, a power consumption calculation unit 42, a power conversion unit 44, and a display unit 46.

  The effective value conversion circuit 16 is connected to an A / D (analog / digital) conversion unit 40 via an amplifier circuit 48. The current and voltage obtained from the current transformer 12 are converted into effective values, amplified, and A The analog signal output to the / D conversion unit 40 and output from the effective value conversion circuit 16 is converted into a digital signal by the A / D conversion unit 40.

  The amplifier circuit 48 includes an operational amplifier IC. The RMS conversion circuit 16 and the positive input of the operational amplifier are connected via a resistor R1, the negative input of the operational amplifier is grounded, and the output of the operational amplifier is Are connected to the A / D converter 40. Also, a plurality of resistors Ra, Rb, Rc,... Are connected in parallel as amplification adjustment resistors between the positive side input of the operational amplifier and the output of the operational amplifier, and the resistors are connected to the switches S1, S2,. .. Is energized, and the amplification factor of the signal input to the A / D converter 40 is adjusted by energizing each resistor. In the present embodiment, the measurement range (when measuring and displaying power consumption by adjusting the amplification of the signal input to the operation display unit 20 by controlling the on / off of the plurality of switches S1 and S2 ( Range) is selected.

  The A / D conversion unit 40 is connected to a power consumption calculation unit 42, and the power consumption calculation unit 42 calculates power consumption from the effective value current and effective value voltage converted into a digital signal.

  However, when actually measuring the primary side power consumption on the AC side in this way, since only the current and voltage are known, the power factor of the low power supply units 14A and 14B including the switching elements and the like is not taken into account, and accurate The power consumption cannot be calculated. Although it is conceivable to measure the power consumption on the secondary side, the loss due to the noise filter etc. on the primary side is not known.

  Therefore, in the present embodiment, the primary state is changed for each state of the image forming apparatus 10 (for example, an operation mode such as a copy mode, a fax mode, or a scan mode, a sleep mode, a voltage supplied to a function unit, or an apparatus configuration). Secondary power consumption corresponding to the side power consumption is measured in advance using a measuring instrument such as a power meter, and the correspondence relationship of the secondary side power consumption corresponding to the primary side power consumption is obtained, and the corresponding relationship is Pre-stored in the conversion unit 44. The correspondence relationship to be stored is stored as a conversion table or an approximate expression, for example.

  In the power consumption calculation unit 42, the primary side power consumption obtained from the effective value current and effective value voltage converted into a digital signal by the A / D conversion unit 40 is converted into a conversion table stored in the power conversion unit 44, The secondary side power consumption is obtained using a correspondence such as an approximate expression. At this time, since the correspondence is stored for each state of the image forming apparatus 10, the state of the image forming apparatus 10 is acquired, and the secondary side power consumption is obtained from the primary side power consumption using the correspondence according to the state. Thus, the amount of electric power is calculated by integration or integration processing, and the calculation result is displayed on the display unit 46.

  In the present embodiment, since the power factors of the low power supply units 14A, 14B and the like change for each state of the image forming apparatus 10, a correspondence relationship is obtained and stored in advance for each load state of the stop power supply unit. Although the correspondence relationship is read and used for each state of the image forming apparatus 10, the correspondence relationship may be obtained and stored in advance for each power factor requirement in which the power factor changes, not for each state. The requirements for changing the rate include every time the load for each supply voltage of the stop power supply units 14A and 14B changes, and every time the configuration requirements of the image forming apparatus 10 change (for example, whether or not the finisher is used). These may be obtained in advance by storing the correspondence relationship for each requirement, and the correspondence relationship corresponding to each requirement may be read and used.

  Here, the correspondence relationship between the primary side apparent power and the primary side power consumption will be specifically described. FIG. 4A is a diagram illustrating a table illustrating an example of a correspondence relationship between the primary side apparent power and the primary side power consumption.

  As shown in FIG. 4A, the correspondence relationship between the primary side apparent power and the primary side power consumption is a power meter for each state (operation mode or sleep mode) with respect to the primary side apparent power (effective value). The primary side power consumption measured according to the state of the image forming apparatus 10 is read out from the primary side apparent power by storing the measured value of the primary side power consumption measured using the The power consumption is calculated.

  In each state, the functional units to be operated are different, so the primary side power consumption is measured for each configuration and stored in correspondence with the effective value. Each configuration differs in, for example, functions such as copy, fax communication, and scan, and the number of low power supply units 14A and 14B that operate for each mode such as a sleep mode and the number of loads, as shown in FIG. Thus, the number of operations and the operation load of the low power supply unit are determined for each configuration.

  4A shows an example in which the correspondence relationship between the primary side power consumption and the secondary side power consumption is held as a conversion table, an approximate expression may be used. That is, an approximate expression corresponding to the state of the image forming apparatus 10 is used by obtaining and holding an approximate expression in advance from the measured values of the primary side apparent power and the primary side power consumption measured for each state of the image forming apparatus 10. Thus, the primary side power consumption is calculated from the primary side apparent power.

  By the way, in the image forming apparatus 10 according to the present embodiment, as described above, it is possible to save power partially and to display power consumption on the display unit 46, but partially. Since power is saved, the measurement range of the effective value current and effective value voltage input from the effective value conversion circuit 16 is widened, and when displayed on the display unit 46, the measurement value is out of the measurement range.

  Therefore, in the present embodiment, the measurement range is adjusted by controlling the on / off states of the switches S1 and S2 for the energization states of the plurality of resistors Ra, Rb, and Rc provided in the amplifier circuit 48. In addition, since the power consumption is determined in advance for each state of the image forming apparatus 10 as described above, the switch for selecting the measurement range is determined when the power conversion unit 44 acquires the state information. By controlling on / off of the switches S1 and S2 according to the ten states, a measurement range for power consumption measurement is selected in advance. Thus, the range adjustment is performed at a higher speed than when the automatic range adjustment is performed outside the measurement range.

  For example, each switch (S1, S2,...) Is turned on / off as shown in FIG. 5 in which a switch that is turned on / off according to the power for each state (operation mode or sleep mode) is set as a predetermined table. It memorize | stores in the conversion part 44 grade | etc.,. When the power conversion unit 44 acquires the state information, the measurement range for power consumption measurement is selected by referring to the table and controlling the on / off of the corresponding switch. Note that each of the resistors for amplification adjustment provided in the amplifier circuit 48 has a resistance value determined in advance so as to be in the center of the measurement range in each state by a combination of on / off of the switch according to the state of the image forming apparatus 10. It has been.

  Further, in order to prevent the measurement range from being out of the measurement range due to noise or the like, when the power calculation unit 42 measures the power consumption on the primary side, the average value of the power consumption is calculated using a predetermined number of sampling data. calculate. At this time, if there is data out of the measurement range from the sampling data, the primary side power consumption is calculated by calculating the average value excluding the data. As a result, an error factor due to noise or the like is removed. At this time, if the number of sampling data outside the measurement range is the same as the number of samplings, it will be judged as noise and the primary power consumption calculated in the previous time will be displayed. If it is determined, it is determined that the system is abnormal, and that effect is displayed on the display unit 46.

  Next, a flow of processing relating to display of power consumption of the image forming apparatus 10 according to the embodiment of the present invention configured as described above will be described. FIG. 6 is a flowchart illustrating an example of a flow of power consumption display processing performed by the operation display unit 20 of the image forming apparatus 10 according to the embodiment of the present invention. The process may be a process performed by the hardware of the operation display unit 20 or a program executed by a computer. The process may be started when the operation display unit 20 is operated and a display of power consumption is instructed, or may be performed while the operation display unit 20 is being displayed.

  In step 100, the state information is acquired by the power conversion unit 44, and the process proceeds to step 102. For example, the power conversion unit 44 acquires state information such as the current mode of the image forming apparatus 10 from the main controller 18.

  In step 102, a measurement range is selected according to the acquired state information, and the process proceeds to step 104. For example, the power conversion unit 44 controls the switch of the amplifier circuit 48 so that the switches S1, S2,... Corresponding to the states acquired from the table shown in FIG. A range is selected.

  In step 104, the effective value is sampled and the routine proceeds to step 106. That is, when power is supplied from the commercial power source to each of the low power supply units 14A and 14B, a current flows from the current transformer 12 to the effective value conversion circuit, and the effective value conversion circuit 16 converts the current into an effective value current and an effective value voltage. Then, an analog signal representing the effective value current and effective value voltage is input to the A / D converter 40. Then, the A / D converter 40 converts the signal into a digital signal, thereby sampling the effective value current and the effective value voltage. At this time, in the present embodiment, a predetermined number of RMS currents and RMS voltages are sampled.

  In step 106, the primary apparent power is calculated from the sampled effective value by the power consumption calculation unit 42, and the process proceeds to step 108. That is, the power consumption calculation unit 42 integrates the effective value current and the effective value voltage to calculate the apparent power. Here, with reference to FIG. 7, the process of the primary side apparent power calculation performed in the power consumption calculation part 42 is demonstrated.

  In step 200, it is determined whether or not there is sampling data having a value outside the measurement range (for example, a value outside the predetermined range) from a predetermined number of sampling data, and the determination is negative. If yes, the process proceeds to step 202. If affirmative, the process proceeds to step 204.

  In step 202, the average primary apparent power is calculated from the sampled effective value, and the process proceeds to step 108.

  In step 204, it is determined whether or not the total number of samples is outside the measurement range. If the determination is negative, the process proceeds to step 206. If the determination is affirmative, the process proceeds to step 208.

  In step 206, the primary side apparent power is calculated by calculating the average value of the power consumption by excluding the sampling data outside the measurement range, and the process proceeds to step 108. This prevents a temporary overrange due to noise or the like. When data outside the measurement range is excluded, the average value of apparent power may be calculated by increasing the number of samplings by the number of excluded samples.

  Further, in step 208, it is determined whether or not the entire measurement range outside the number of samples is continuous. If the determination is affirmative, the process proceeds to step 210. If the determination is negative, the process proceeds to step 212.

  In step 210, a message indicating that the system is abnormal is displayed on the display unit 46, and the series of processes is terminated.

  On the other hand, in step 212, the process proceeds to step 108 using the apparent power calculated last time as the primary side power consumption.

  Returning to the flowchart of FIG. 6, in step 108, the primary power consumption is calculated by the power consumption calculator 42 according to the acquired state, and the process proceeds to step 110. That is, the primary side power consumption corresponding to the state information acquired in step 100 and the primary side apparent power calculated in step 106 is calculated. Specifically, when the conversion table is used, the primary side power consumption corresponding to the primary side apparent power (effective value) and the acquired state information (mode, configuration, etc.) from the conversion table shown in FIG. By reading, the primary side power consumption is calculated. When the secondary side is stopped due to energy saving or the like, there is a loss due to the effective value conversion circuit 16 or the like, so the fixed value of the primary side loss measured in advance is subtracted from the measured value measured by the current transformer 12. The power consumption is obtained, and the primary side power consumption corresponding to the power consumption is calculated.

  In step 110, the calculated power consumption is accumulated by the power consumption calculator 42, and the process proceeds to step 112. That is, the amount of electric power is calculated by integrating the calculated primary side power consumption (integration with the sampling time). Note that the power amount may be calculated by integrating the primary side power consumption calculated by sampling.

  In step 112, the power value is displayed on the display unit 46, and the process proceeds to step 114. That is, the primary side power consumption obtained from the primary apparent power is displayed on the display unit 46 using a predetermined correspondence relationship between the primary side power consumption and the secondary side power consumption. Therefore, since the secondary side power consumption is obtained from the predetermined correspondence between the primary side apparent power and the primary side power consumption, the accurate power consumption considering the power factor of the low power supply units 14A, 14B, etc. is displayed. The The calculated amount of power consumption is stored as log information in various storage media such as the nonvolatile memory 18D of the main controller 18 and is updated as the amount of power changes.

  In step 114, it is determined whether or not the power display ends. This determination is made, for example, by determining whether or not an instruction to perform another display is performed by operating the operation display unit 20, and when the determination is negative, the process returns to step 100 and the above-described processing is repeated. When the determination is affirmed, the series of processing ends.

  That is, in the present embodiment, when displaying the power consumption on the operation display unit 20, the primary side power consumption is obtained by using a predetermined correspondence relationship with the primary side power consumption corresponding to the primary side apparent power. Since the power amount is calculated and displayed, the power consumption considering the power factor of the low power supply units 14A, 14B, etc. is displayed, so the actual accurate power consumption is displayed. At this time, the range is selected in advance by adjusting the amplification adjustment resistor provided in the amplifier circuit 48 in accordance with the state of the image forming apparatus 10, so that the actual range is not exceeded. Power consumption is displayed accurately and quickly.

  Moreover, since the primary side apparent power is measured using the current transformer 12, accurate power consumption is displayed with an inexpensive and simple configuration, and power consumption due to power measurement is also suppressed.

  In the above-described embodiment, the image forming apparatus 10 has been described as an example. However, the present invention is not limited to this, and various types of information processing apparatuses can be applied to consume power as described in the above-described embodiment. You may make it display in search of.

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 12 Current transformer 14A, 14B Low power supply part 16 Effective value conversion circuit 20 Operation display part 38 Power supply part 40 A / D conversion part 42 Power consumption calculation part 44 Power conversion part 46 Display part 48 Amplifier circuit

Claims (16)

A measuring means for measuring power consumption;
Adjustment means for adjusting the measurement range by the measurement means so that the measurement range becomes a predetermined range for each state of the device with different power consumption,
Display means for calculating and displaying the amount of power consumption from the measurement result by the measurement means measured in the measurement range adjusted by the adjustment means;
An information processing apparatus comprising:   Each of the predetermined measurement ranges is predetermined so that an average value of power for each state of the device obtained from a result measured in advance using a power meter for each state of the device is in the center of the measurement range. The information processing apparatus according to claim 1.   The information processing according to claim 1 or 2, wherein each of the predetermined measurement ranges is predetermined so that a change amount obtained from a result measured in advance using a power meter for each state of the device is accommodated. apparatus.   The adjustment unit adjusts a measurement range by the measurement unit by adjusting a resistance value for amplification in an amplification circuit for amplifying a signal representing a measurement result of the measurement unit. The information processing apparatus according to item.   The information processing apparatus according to any one of claims 1 to 4, wherein the display unit calculates and displays the electric energy by excluding a measurement result out of a measurement range from the measurement result.   The information processing apparatus according to claim 5, wherein the display unit calculates and displays the power amount from an average value of power consumption excluding measurement results out of a measurement range among the measurement results.   The display means calculates the power consumption by obtaining an average value of power consumption for each predetermined number of the measurement results, and when the predetermined number of the measurement results are all outside the measurement range, the previous calculation is performed. The information processing apparatus according to claim 5, wherein the amount of electric power that has been displayed is displayed.   The display means calculates the power consumption by obtaining an average value of power consumption for each predetermined number of the measurement results, and the case where the predetermined number of the measurement results are all outside the measurement range continues. The information processing apparatus according to claim 5, wherein the information processing apparatus displays an error message by determining that the error has occurred. An obtaining step for obtaining a measurement result of a measuring means for measuring power consumption;
An adjustment step of adjusting the measurement range by an adjustment unit that adjusts the measurement range by the measurement unit so that the measurement range becomes a predetermined range for each state of the device with different power consumption,
From the measurement result obtained by the measurement means measured in the measurement range adjusted in the adjustment step acquired in the acquisition step, a display step of calculating the amount of power consumption and displaying it on the display unit;
Processing program for causing a computer to execute processing including   Each of the predetermined measurement ranges is predetermined so that an average value of power for each state of the device obtained from a result measured in advance using a power meter for each state of the device is in the center of the measurement range. The information processing program according to claim 9.   The information processing program according to claim 9 or 10, wherein each of the predetermined measurement ranges is predetermined so that a change amount obtained from a result measured in advance using a power meter for each state of the apparatus is accommodated. .   The adjustment step adjusts a measurement range by the measurement unit by adjusting a resistance value for amplification in an amplification circuit for amplifying a signal representing a measurement result of the measurement unit. Information processing program according to item.   The information processing program according to any one of claims 9 to 12, wherein in the display step, the power amount is calculated by excluding a measurement result out of a measurement range from the measurement result and displayed on a display unit.   The information processing program according to claim 13, wherein the display step calculates the power amount from an average value of power consumption excluding a measurement result out of a measurement range among the measurement results and displays the calculated power amount on a display unit.   The display step calculates the power consumption by obtaining an average value of power consumption for each predetermined number of the measurement results, and when the predetermined number of the measurement results are all outside the measurement range, the previous calculation is performed. The information processing program according to claim 13 or 14, wherein the amount of power that has been displayed is displayed on a display unit.   In the display step, the power consumption is calculated by obtaining an average value of power consumption for each predetermined number of the measurement results, and the predetermined number of the measurement results are all outside the measurement range. The information processing program according to claim 13 or 14, wherein the information processing unit displays an indication of abnormality on the display unit.

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