JP2018023269A - Electrical apparatus and method for managing power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency of a power recovery operation. SOLUTION: When a switch that is turned on / off according to opening / closing of an opening / closing section is in a closed state or in an operation mode for operating a load output, power is supplied to the load, and the switch is operated. Is open, or in the operation stop mode that stops the load output, the converter that stops the power supply to the load and the charge on the power supply side capacitor when the converter is stopped A discharge circuit for discharging, a discharge completion detecting means for detecting completion of the discharge in the discharge circuit based on a voltage in the discharge circuit, and a switch closed state, or the operation stop mode. When the discharge completion detecting means detects that the discharge of the capacitor is completed at the time of switching to the operation mode after finishing the And the power supply return means for returning the operation of the data, with a. [Selection diagram] Figure 2

Description

  The present invention relates to an electric device and a power management method.

  In a conventional general image forming apparatus, a capacitor is provided at an output end of a power supply system (power management apparatus) or an image forming unit (load circuit) which is a power supply destination module for the purpose of stabilizing the power supply. It is connected.

  In general image forming apparatuses, an interlock switch for connecting a power source to a load circuit is provided in conjunction with opening / closing of an opening / closing unit or the like. The interlock switch disconnects the power supply by turning off the switch that outputs the power from the power supply to the load circuit according to the opening of the opening / closing part, and turns on the switch according to the closing of the opening / closing part. Is output to the load circuit.

  However, when the power supply is cut off by turning off the interlock switch that connects the power supply to the load circuit in conjunction with the opening of the opening / closing part of the image forming apparatus, the residual charge is not stored in the capacitor in the load circuit to which the power is supplied. Occurs. Thereafter, when the open / close unit is closed and the interlock switch is turned on and the power is turned on, an inrush current may be generated in the power supply destination due to the residual charge. This inrush current may cause malfunction of a power supply destination due to a power supply voltage drop and damage to circuit elements such as an interlock switch.

  Therefore, as a conventional technique, a technique for preventing the influence of such an inrush current is disclosed. For example, in Patent Document 1, for the purpose of suppressing inrush current when re-switching on, the resistance value of the transistor connected on the current line is changed from high resistance to low resistance to suppress inrush current when re-switching on. Technology is disclosed.

  Patent Documents 2 and 3 disclose techniques related to a discharge circuit that discharges a residual charge when a power supply is cut off by relay-off in conjunction with opening of an opening / closing part. By discharging the residual charge by the discharge circuit, it is possible to prevent an inrush current from occurring when the power is turned on again.

  However, in the prior art, it has not been detected whether or not the discharge by the discharge circuit has been completed. Therefore, when the power supply to the image forming unit is restored, it is necessary to restart the power supply after waiting for an amount of time that the discharge is sufficiently performed and the effect of the inrush current is sufficiently reduced. . In other words, in the prior art, there is room for improvement in the power recovery operation such that the power supply is not resumed until a predetermined waiting time elapses although the discharge is completed.

  The present invention has been made in view of the above, and provides an electrical device and a power management method capable of improving the efficiency of the power recovery operation.

  In order to solve the above-described problems and achieve the object, the present invention is in an operation mode in which a switch that is turned on or off in response to opening and closing of the opening and closing unit is in a closed state or operating a load output. In the case, the power supply to the load is performed, and when the switch is in the open state, or the operation stop mode for stopping the load output, the converter for stopping the power supply to the load, A discharge circuit for discharging the electric charge of the capacitor on the power supply side when the converter is stopped; a discharge completion detecting means for detecting that the discharge in the discharge circuit is completed based on a voltage in the discharge circuit; and the switch When the battery is closed, or when the operation stop mode is terminated and the operation mode is switched to, the discharge completion detection means detects that the discharge of the capacitor has been completed. If the detecting, characterized in that and a power return means for returning the converter operation of the power supply side.

  According to the present invention, there is an effect that it is possible to provide an electric device and a power management method that can improve the efficiency of the power recovery operation.

FIG. 1 is a diagram showing an outline of the configuration of the image forming apparatus of the present embodiment. FIG. 2 is a schematic configuration diagram illustrating a power supply circuit of the image forming apparatus. FIG. 3 is a time chart showing the operation when the cover is opened and when the cover is closed. FIG. 4 is a diagram for explaining the circuit operation when the cover is closed. FIG. 5 is a diagram for explaining the circuit operation when the cover is opened. FIG. 6 is a time chart showing an operation when the discharge circuit is damaged by a short circuit. FIG. 7 is a time chart showing the operation when the discharge circuit is broken open.

  Exemplary embodiments of an electric device and a power management method will be described below in detail with reference to the accompanying drawings. In the following embodiments, an example in which an image forming apparatus is applied as an electrical apparatus of the present invention is shown. However, the electrical apparatus according to the present invention is not limited to an image forming apparatus, and may be applied to other electrical apparatuses. Good.

  FIG. 1 is a diagram illustrating an outline of a configuration of an image forming apparatus 1000 according to the present embodiment. The image forming apparatus 1000 requests processing by functions such as a copy, a printer, and a facsimile, receives a job input performed by a user, and performs image output processing such as paper (printing) output in accordance with the job instruction.

  As shown in FIG. 1, the image forming apparatus 1000 includes an image forming unit 200, an automatic document feeder 52, a finisher 53 with a stapler and a shift tray, a duplex reversing unit 54, an extended sheet feeding tray 55, and a large capacity sheet feeding tray LCT 56. Each unit includes a one-bin discharge tray 57 and an insert feeder 58.

  The image forming unit 200 includes a scanner unit that reads a document, a printer engine that performs print output by an electrophotographic method including elements such as an optical writing unit, a photosensitive member, and a developing unit, a paper feeding unit, and the like.

  The image forming unit 200 includes a controller 30 (see FIG. 2) for controlling the entire device. The controller 30 accepts job input and performs paper (printing) output in accordance with job instructions, so as to centrally manage each element unit related to the image output processing system and control its operation. Maintain and manage equipment conditions so that the elements operate properly.

  The controller 30 can be configured by a computer mounted on a controller board provided in the image forming unit 200. This computer includes a CPU (Central Processing Unit), a ROM (Read Only Memory) that operates under the control of the CPU, a DRAM (Dynamic Random Access Memory), and the like.

  The ROM is a memory that controls operations of the printer engine and the paper feed unit, and stores programs, data, and the like used by the CPU when processing image data used for print output. When the CPU of this computer is responsible for data (signal) processing related to the operation of a power supply circuit to be described later, this data processing program and the like are stored in the ROM.

  The DRAM is a memory used as a memory for temporarily storing data generated when the CPU drives the program, or a work memory for storing data necessary for driving the program.

  Next, a power supply circuit of the image forming apparatus 1000 will be described. FIG. 2 is a schematic configuration diagram illustrating a power supply circuit of the image forming apparatus 1000. The image forming apparatus 1000 includes a power management apparatus 100 that supplies power to the image forming unit 200.

  First, the configuration on the image forming unit 200 side will be described. As shown in FIG. 2, the image forming unit 200 mainly includes a diode 25, a switch 26, a load circuit 27, a capacitor 28, and a controller 30. The switch 26 and the diode 25 are connected in parallel. The load circuit 27 and the capacitor 28 are connected in parallel. In addition to the switch 26, an operation display unit 31 and a communication interface (communication I / F) 32 are connected to the controller 30.

  The switch 26 is an interlock switch for detecting the open / closed state of the cover 40 of the image forming unit 200. The cover 40 is for opening the inside of the automatic document feeder 52, the finisher 53, the double-side reversing unit 54, the extended paper feed tray 55, the large capacity paper feed tray LCT56, the one-bin paper discharge tray 57, and the insert feeder 58 described above. It is an opening / closing part. The cover 40 is a cover for opening the inside of the image forming unit 200 when the toner cartridge is inserted or removed. When the cover 40 is opened, the switch 26 is in an open state (open). When the cover 40 is closed, the switch 26 is closed (closed).

  Note that, here, the open / close state of the switch 26 is switched in conjunction with the opening / closing of the cover 40, but the switching method of the switch 26 is not limited to this. For example, the open / close state of the switch 26 may be switched in conjunction with the insertion / extraction of the drawer unit of the large-capacity paper feed tray LCT56. In the present embodiment, the cover 40 is, for example, a drawer unit (opening / closing unit) for the large-capacity paper feed tray LCT56. Accordingly, the load circuit 27 is, for example, a drawer unit that requires a power source.

  The energy saving (energy saving) signal 29 is a control signal output from the controller 30 to limit power supply during job standby. The energy saving signal 29 is switched according to the open / closed state of the switch 26 and is switched by the control of the controller 30.

  First, the controller 30 switches and outputs the energy saving signal 29 between the HIGH state and the LOW state according to the open / close state of the switch 26. For example, when the switch 26 is opened as the cover 40 is opened, the controller 30 outputs the energy saving signal 29 to the primary converter 1 in a HIGH state. On the other hand, when the cover 40 is closed and the switch 26 is closed, the controller 30 outputs the energy saving signal 29 to the primary side converter 1 in the LOW state.

  On the other hand, regarding the switching by the controller 30, when the job standby time of the image forming unit 200 exceeds a predetermined time, the controller 30 outputs the energy saving signal 29 to the primary side converter 1 in a HIGH state.

  Further, when there is a job input from the communication interface 32 or the operation display unit 31, the controller 30 outputs the energy saving signal 29 to the primary side converter 1 in the LOW state.

  When the high-side energy saving signal 29 is input, the primary side converter 1 limits the power supply amount and supplies power in the energy saving mode. As the energy saving mode, several types of modes that are conventionally used may be provided. However, in this embodiment, an operation stop mode (pause mode) in which the primary side converter 1 is stopped to stop the power supply to the secondary side. ) Will be described.

  When the energy-saving signal 29 in the LOW state is input, the primary-side converter 1 ends the energy-saving mode and resumes power supply in the operation mode (normal mode, full mode) if the energy-saving mode is input.

  The controller 30 comprehensively controls the operations of the power management apparatus 100 and the image forming unit 200. For example, as described above, the controller 30 switches between the operation mode (normal mode, full mode) for operating the load output and the operation stop mode (pause mode) for stopping the load output, which is one of the energy saving modes, It functions as converter control means for controlling the operation of the primary side converter 1.

  The controller 30 functions as a discharge completion detection unit that reads the discharge detection signal output from the detection circuit 5 of the power management apparatus 100 and detects that the discharge operation of the discharge circuit 3 has been completed. The discharge detection signal will be described later.

  In addition, when the switch 26 is closed or when the operation stop mode is switched to the operation mode, the controller 30 performs the primary operation if the discharge operation of the discharge circuit 3 of the power management device 100 is completed. It functions as a power return means for returning the operation of the side converter 1 and starting the power supply operation.

  Next, the configuration on the power management apparatus 100 side will be described. As shown in FIG. 2, the power management apparatus 100 mainly includes a primary side converter 1, a transformer 2, a discharge circuit 3, and a capacitor 24. The primary side converter 1 generates a switching output, and transmits energy, that is, supplies power to the secondary image forming unit 200 side via the transformer 2. The capacitor 24 smoothes the voltage to generate a DC voltage, and supplies the generated DC voltage to the image forming unit 200 side.

  The discharge circuit 3 includes a control circuit 4 and a detection circuit 5. The control circuit 4 includes a resistor 6, a transistor 7, a resistor 8, a transistor 9, a shunt regulator 10, a resistor 11, a resistor 12, an operational amplifier 13, a resistor 14, a resistor 15, and an FET (Field Effect Transistor) 16.

  In the control circuit 4, the transistor 7 is turned on / off, the transistor 9 is turned on / off, and the FET 16 is turned on / off according to the HIGH / LOW state of the energy saving signal 29. When these elements are turned on, the discharge path in which the resistor 15, the FET 16 and the resistor 17 are connected in series is turned on, that is, in a dischargeable state, and the capacitor 24 and the capacitor 28 start discharging. .

  The FET 16 is configured as a constant current discharge circuit whose gate signal is controlled by the operational amplifier 13, and the drain current value of the FET 16 is determined by the voltage at the positive end of the operational amplifier 13 and the resistor 15. For example, when the voltage at the positive end of the operational amplifier 13 is 1.2V and the resistance 15 is 0.5Ω, the flowing current is 1.2V / 0.5Ω = 2.4A.

  The detection circuit 5 includes resistors 17, 18, 19, 21, 22, 23 and an operational amplifier 20. The detection circuit 5 is a circuit that outputs a discharge detection signal to the controller 30 in accordance with the drain current of the FET 16. The voltage of the discharge detection signal, that is, the voltage at the point B is determined by the drain current of the FET 16 and the values of the resistors 17, 19, and 21.

  For example, when the drain current of the FET 16 is 2.4 A, the resistance 17 is 0.5Ω, the resistance 19 is 10 kΩ, and the resistance 21 is 30 kΩ, the voltage of the discharge detection signal, that is, the voltage at the point B is 2.4 A × 0. 0.5Ω × 30 kΩ / 10 kΩ = 3.6V. When the detection circuit 5 outputs this voltage to the controller 30, the image forming unit 200 can grasp the state of the discharge operation of the discharge circuit 3.

  That is, when the voltage at the point B in FIG. 2 is not a predetermined value, that is, when the discharge detection signal is LOW, the controller 30 detects that the discharge operation by the discharge circuit 3 is stopped. In addition, when the voltage at point B in FIG. 2 is a predetermined value, that is, when the discharge detection signal is HIGH, the controller 30 detects that the discharge circuit 3 is in a discharging operation.

  As described above, the power management apparatus 100 according to the present embodiment sends the discharge detection signal based on the voltage in the discharge circuit 3 to the controller 30 of the image forming unit 200, thereby changing the discharge state of the discharge circuit 3 to the image forming unit 200. Notify the side. As the discharge detection signal, for example, the voltage at point B in FIG. 2 can be used. The discharge detection signal is not limited to the voltage value at the point B, but is processed such that the voltage is multiplied by a coefficient or the voltage is binarized by the circuit configuration on the power management apparatus 100 side. Also good.

  Next, the discharge operation will be described using a time chart.

  FIG. 3 is a time chart showing the operation when the cover 40 is opened and when the cover 40 is closed. FIG. 3A is a time chart showing the open / closed state of the switch 26. FIG. 3B is a time chart showing the HIGH / LOW state of the energy saving signal 29. FIG. 3C is a time chart showing the HIGH / LOW state of the discharge detection signal. FIG. 3D is a time chart showing the voltage at point A in FIG. FIG. 3E is a time chart showing the state of the current Io in FIG. FIG. 3F is a time chart showing the state of the discharge current Idis in FIG.

  As shown in FIG. 3A, when the cover 40 of the image forming unit 200 is opened at time t0, the switch 26 is opened (OPEN), and the energy saving signal 29 is HIGH as shown in FIG. It becomes a state. When the energy saving signal 29 is in a HIGH state, the primary side converter 1 stops. Further, when the energy saving signal 29 is in a HIGH state and each element is turned on, the discharge circuit 3 starts constant current discharge, and discharges the charges of the capacitor 24 and the capacitor 28. As shown in FIG. 3 (f), the discharge current Idis flowing through the resistor 17 starts to discharge at time t0 and continues to discharge at time t1.

  Further, since the current Io in FIG. 2 flows in a direction opposite to that when the primary side converter 1 is driven (until time t0), the current Io takes a negative value as shown in FIG. In addition, since it is constant current discharge, the current Io from the capacitors 24 and 28 toward the discharge circuit 3 takes a constant negative value during the discharge period. As shown in FIG. 3D, the voltage at point A in FIG. 2 begins to decrease when the discharge is started at time t0, and is maintained at zero after the discharge is completed at time t1.

  On the other hand, as shown in FIG. 3C, the voltage at the point B of the detection circuit 5 in FIG. 2, that is, the discharge detection signal, is maintained in the HIGH state when the discharge starts at time t0, and the discharge is completed at time t1. Then, it becomes a LOW state. That is, the detection circuit 5 of the present embodiment outputs a high-level discharge detection signal to the controller 30 while the discharge circuit 3 is performing a discharge operation.

  As shown in FIG. 3 (a), when the cover 40 is closed at time t2 and the switch 26 is closed (CLOSE), a waiting time (wait) of several milliseconds as shown in FIG. After time (delay time), the energy saving signal 29 is switched to the LOW state at time t3. As described above, since the discharge detection signal shown in FIG. 3C is switched to the LOW state and the discharge is completed, the waiting time in this embodiment is shorter than the conventional waiting time. Good. Or in this embodiment, it is not necessary to provide waiting time itself.

  Primary converter 1 starts the charging operation from time t3, and discharging circuit 3 stops the discharging operation. Since charging of the capacitors 24 and 28 starts from the time t3, as shown in FIG. 3D, the voltage at the point A starts to increase and from the power management apparatus 100 side to the load circuit 27 side of the image forming unit 200. The current Io (see FIG. 2) going to the positive value is also a positive value as shown in FIG. In the present embodiment, since the discharge of the capacitors 24 and 28 is completed as described above, the inrush current immediately after the time t3 can be suppressed.

  As described above, in the present embodiment, by detecting the discharge detection signal, the image forming apparatus 1000 can determine whether or not the discharge in the discharge circuit 3 is completed. The converter 1 can be redriven. In other words, since the completion of the discharge operation has not been detected in the past, the primary side converter is re-driven after sufficient waiting time for the time that the discharge operation is considered to have been completed. Sometimes it took time. On the other hand, in this embodiment, since the primary side converter 1 can be re-driven quickly if the discharge operation is completed, the waiting time can be shortened and the efficiency of the power recovery operation can be improved.

  Next, the circuit operation when the cover 40 is closed and the circuit operation when the cover 40 is opened will be described with reference to FIGS. 4 and 5. Since the internal configurations of the control circuit 4 and the detection circuit 5 are the same as those in FIG. 2, the internal configurations are omitted in FIGS.

  FIG. 4 is a diagram for explaining the circuit operation when the cover 40 is closed. When the cover 40 is closed, the switch 26 is also in a closed circuit state (closed), and the energy saving signal 29 is in a LOW state. When the switch 26 is in the closed circuit state and the energy saving signal 29 is in the LOW state, the primary side converter 1 operates and the discharge operation in the discharge circuit 3 is stopped. The power management device 100 supplies power to the load circuit 27 while charging the capacitors 24 and 28 by the primary side converter 1. In this case, since the discharge current Idis does not flow, the voltage at point B in FIG. 4, that is, the discharge detection signal is in the LOW state. Thereby, the controller 30 detects that the discharging operation by the discharging circuit 3 is stopped.

  FIG. 5 is a diagram for explaining the circuit operation when the cover 40 is open. When the cover 40 is opened, the switch 26 is also in an open circuit state (open), and the energy saving signal 29 is in a HIGH state. When the switch 26 is in an open circuit state and the energy saving signal 29 is in a HIGH state, the primary side converter 1 stops and the discharge circuit 3 starts a discharge operation. The charges charged in the capacitors 24 and 28 during the charging operation shown in FIG. 4 pass through the discharge path of the control circuit 4 and are discharged with a constant current. Note that the discharge path is a path including the FET 16, the resistor 15, and the resistor 17 shown in FIG. A discharge current Idis flows through the discharge path. The electric charge accumulated in the capacitor 28 is discharged through the diode 25 connected in parallel with the switch 26. While the discharge current Idis flows, the voltage at point B in FIG. 4, that is, the discharge detection signal is in a HIGH state. Thereby, the controller 30 detects that the discharge circuit 3 is performing the discharge operation.

  As described above, in this embodiment, the discharge circuit 3 includes the detection circuit 5, and the detection circuit 5 outputs a discharge detection signal indicating a discharge state to the controller 30. Thereby, the controller 30 can determine whether or not the discharge is completed, and can safely return the power supply operation after the discharge is completed. Therefore, it is possible to prevent a situation in which the power supply operation is restored without discharging being completed and an inrush current is generated.

  Next, a method for detecting breakage of the discharge circuit 3 will be described with reference to FIGS. In the present embodiment, it is possible to detect that the discharge circuit 3 is short-circuited or open (open) by using the discharge detection signal.

  First, a detection method when the discharge circuit 3 is damaged by a short circuit will be described.

  FIG. 6 is a time chart showing the operation when the discharge circuit 3 is short-circuit damaged. In the discharge circuit 3, for example, when the FET 16 (see FIG. 2) is short-circuited, the discharge path composed of the FET 16, the resistor 15, and the resistor 17 is always conducted. In this case, the discharge circuit 3 is in a discharge state regardless of whether the switch 26 is opened or closed and the energy saving signal 29 is in a HIGH / LOW state.

  That is, as shown in FIG. 6F, the discharge current Idis continues to flow regardless of the opening / closing of the switch 26 and the HIGH / LOW state of the energy saving signal 29. In addition, as shown in FIG. 6C, the detection circuit 5 always outputs a high-level discharge detection signal to the controller 30.

  Therefore, at the timing when the energy saving signal 29 is in the LOW state, that is, at the timing when the discharge operation is not performed in the normal state where the discharge circuit 3 is not damaged, the discharge detection signal remains in the HIGH state. It can be seen that the discharge circuit 3 is short-circuited.

  By utilizing this, in the present embodiment, the controller 30 reads the discharge detection signal at the start of the operation of the power management apparatus 100, for example, and if the discharge detection signal remains unchanged in the HIGH state, the FET 16 of the discharge circuit 3 is short-circuited. Judge that it is damaged. Then, the controller 30 notifies the operation display unit 31 of the fact that the FET 16 of the discharge circuit 3 is short-circuit damaged or the corresponding error number. Thereby, in this embodiment, the short circuit failure of the discharge circuit 3 can be discovered at an early stage.

  Next, a detection method when the discharge circuit 3 is broken open will be described.

  FIG. 7 is a time chart showing the operation when the discharge circuit 3 is open broken. In the discharge circuit 3, for example, when the FET 16 (see FIG. 2) is open and damaged, the discharge path including the FET 16, the resistor 15, and the resistor 17 is always disconnected, and the switch 26 is opened and closed, and the energy saving signal 29 HIGH / The discharge circuit 3 cannot perform the discharge operation regardless of the LOW state.

  That is, as shown in FIG. 7F, the discharge current Idis is maintained at zero regardless of whether the switch 26 is opened or closed and the energy saving signal 29 is in a HIGH / LOW state. Then, as shown in FIG. 7C, the detection circuit 5 always outputs the LOW state discharge detection signal to the controller 30.

  Therefore, at the timing when the energy saving signal 29 is in the HIGH state, that is, at the timing when the discharge operation is performed in the normal state where the discharge circuit 3 is not damaged, the discharge detection signal remains unchanged in the LOW state. It can be seen that the discharge circuit 3 is open.

  In this embodiment using this, for example, when the operation of the power management apparatus 100 is stopped, the controller 30 reads the discharge detection signal. If the discharge detection signal remains unchanged in the LOW state, the FET 16 of the discharge circuit 3 is opened. It is determined that it is damaged. Then, the controller 30 notifies the operation display unit 31 of the fact that the FET 16 of the discharge circuit 3 is broken open or the corresponding error number. Thereby, in this embodiment, the open breakage of the discharge circuit 3 can be discovered at an early stage.

  As described above, according to the above embodiment, the completion of the discharge operation is detected by detecting the completion of the discharge operation in the discharge circuit 3 based on the voltage (that is, the discharge detection signal) in the discharge circuit 3. Then, the power supply by the primary side converter 1 is restored. Therefore, according to the present embodiment, the inrush current can be prevented without setting the waiting time for discharging as in the prior art, and the efficiency of the power recovery operation can be improved.

DESCRIPTION OF SYMBOLS 1 Primary side converter 3 Discharge circuit 4 Control circuit 5 Detection circuit 16 FET
26 switch 29 energy saving signal 30 controller 31 operation display unit 40 cover 100 power management device 200 image forming unit 1000 image forming device

JP 2004-048888 A JP2015-141515A JP2015-167430A

Claims (5)

When a switch that is turned on or off in response to the opening / closing of the opening / closing part is in a closed state, or in an operation mode in which a load output is operated, power is supplied to the load, and the switch is in an open state. When it becomes, or when it becomes the operation stop mode to stop the load output, the converter that stops the power supply to the load,
A discharge circuit for discharging the electric charge of the capacitor on the power supply side when the converter is stopped;
A discharge completion detecting means for detecting that the discharge in the discharge circuit is completed based on a voltage in the discharge circuit;
When the switch is in a closed state or when the operation stop mode is ended and the operation mode is switched to the operation mode, the discharge completion detection unit detects that the discharge of the capacitor is completed, Power return means for returning the operation of the converter on the power supply side;
With electrical equipment. An abnormality detecting means for detecting an abnormality of the discharge circuit based on an open / closed state of the switch and a voltage in the discharge circuit;
A notification means for notifying the abnormality when the abnormality detection means detects the abnormality;
The electrical apparatus according to claim 1, comprising: The abnormality detection means detects that the discharge circuit is electrically short-circuited when the voltage in the discharge circuit is in a HIGH state regardless of the open / closed state of the switch;
The notifying means notifies the display unit that the discharge circuit is short-circuited.
The electric device according to claim 2. The abnormality detection means detects that the discharge circuit is electrically open when the voltage in the discharge circuit is in a LOW state regardless of the open / closed state of the switch,
The notifying means displays on the display section that the discharge circuit is open;
The electric device according to claim 2 or 3. When a switch that is turned on or off according to the opening / closing of the opening / closing part is in a closed state, or in an operation mode in which a load output is operated, power is supplied to the load, and the switch is in an open state. When it becomes, or when it becomes the operation stop mode to stop the load output, the converter that stops the power supply to the load,
A discharge circuit for discharging the electric charge of the capacitor on the power supply side when the converter is stopped;
A power management method executed by an electrical device comprising:
A discharge completion detecting step for detecting that the discharge in the discharge circuit is completed based on a voltage in the discharge circuit;
If it is detected that the discharge of the capacitor is completed in the discharge completion detection step when the switch is closed or when the operation stop mode is ended and the operation mode is switched to the operation mode. , A power recovery process for recovering the operation of the converter on the power supply side,
Power management method including.

Images