WO2021053798A1 - Power supply device and lifespan diagnosis method - Google Patents

Power supply device and lifespan diagnosis method Download PDF

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Publication number
WO2021053798A1
WO2021053798A1 PCT/JP2019/036800 JP2019036800W WO2021053798A1 WO 2021053798 A1 WO2021053798 A1 WO 2021053798A1 JP 2019036800 W JP2019036800 W JP 2019036800W WO 2021053798 A1 WO2021053798 A1 WO 2021053798A1
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WO
WIPO (PCT)
Prior art keywords
capacitor
switch
time
voltage value
life
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PCT/JP2019/036800
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French (fr)
Japanese (ja)
Inventor
隆志 西岡
高彦 安藤
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三菱電機株式会社
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Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to CN201980100372.2A priority Critical patent/CN114375402B/en
Priority to PCT/JP2019/036800 priority patent/WO2021053798A1/en
Priority to JP2020500673A priority patent/JP6678845B1/en
Priority to DE112019007629.9T priority patent/DE112019007629T5/en
Priority to TW109109756A priority patent/TWI748383B/en
Publication of WO2021053798A1 publication Critical patent/WO2021053798A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/64—Testing of capacitors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/40—Testing power supplies

Definitions

  • the present invention relates to a power supply device and a life diagnosis method.
  • the power supply uses a capacitor, which is a life component, for voltage smoothing. As the deterioration of the capacitor progresses, the capacity of the capacitor decreases, so that there is a high possibility that the power supply device will not operate normally. Therefore, a technique for diagnosing the life of a capacitor is required.
  • Patent Documents 1 and 2 after the power supply to the capacitor is stopped, the electric charge accumulated in the capacitor is discharged by a resistor connected in parallel with the capacitor, and the voltage value of the capacitor is a predetermined voltage value from the start of discharge.
  • a technique for diagnosing the life of a capacitor based on the time required to reach is disclosed.
  • Patent Document 1 since the capacitor and the power transistor module are always connected in parallel, the electric charge accumulated in the capacitor is also discharged even in the power transistor module, so that there is a problem that the voltage of the capacitor at the start of discharge is not stable. is there.
  • Patent Document 2 since the capacitor and the resistor are always connected in parallel, the discharge is started immediately when the power supply to the capacitor is cut off, so that the voltage of the capacitor at the start of discharge is not stable due to the ripple component. There's a problem.
  • an object of the present invention is to provide a power supply device or the like capable of accurately diagnosing the life of a capacitor.
  • the power supply device The first line and The second line, which has a lower potential than the first line, A first switch whose one end is connected to the first wire, A capacitor with one end connected to the first switch and the other end connected to the second wire. A resistor connected in parallel with the capacitor A second switch connected in series with the resistor, A voltage value detecting means for detecting a voltage value between both ends of the capacitor and A switch control means for controlling the first switch and the second switch, Life diagnostic means for diagnosing the life of the capacitor and With When the first time is reached when the first switch is on and the second switch is off, the switch control means turns off the first switch, and the first switch is turned off from the first time.
  • the voltage value detecting means has a first voltage value of the capacitor between the first time and the second time, and a third time when the second elapsed time has elapsed from the second time.
  • the second voltage value of the capacitor in The life diagnosis means diagnoses the life of the capacitor based on the first voltage value and the second voltage value.
  • the voltage between both ends of the capacitor at the start of discharge is stabilized by turning on the second switch after the lapse of the first elapsed time after turning off the first switch. Therefore, according to the present invention, the life of the capacitor can be diagnosed with high accuracy.
  • the figure which shows the structure of the power-source device which concerns on embodiment of this invention The figure which shows an example of the life characteristic of the capacitor which concerns on embodiment of this invention.
  • capacitor life is to determine how much the deterioration of the capacitor has progressed, how much the capacitor can be used, and how much the deterioration of the capacitor should be replaced. It broadly includes determining the deterioration of the capacitor, such as determining whether or not the capacitor has progressed to.
  • the power supply device 1 is a power supply device capable of diagnosing the life of a capacitor provided in itself and notifying the diagnosis result.
  • the power supply device 1 includes a capacitor 10, a switch 11, a switch 12, a resistor 13, a capacitor 10a, a switch 11a, a switch 12a, a resistor 13a, a diode 14, a transformer 15, a control unit 16, a storage unit 17, a line L1 and a line L2. ..
  • the power supply device 1 drives the load 2 with DC power.
  • the power supply device 1 controls the notification device 3 to notify the diagnosis result of the life of the capacitor 10 and the capacitor 10a.
  • the power supply device 1 is an example of the power supply device according to the present invention.
  • the line L1 is an example of the first line according to the present invention
  • the line L2 is an example of the second line according to the present invention.
  • the left side is the primary side and the right side is the secondary side with respect to the transformer 15.
  • the description about the primary side is omitted. In the following description, the description of the primary side will be omitted.
  • the black circles on the upper left and lower right of the transformer 15 shown in FIG. 1 indicate the polarity of the winding of the transformer 15.
  • the power supply device 1 is a power supply device by a flyback method.
  • a set of capacitors 10a and the like is provided in order to operate the power supply device 1 normally even when the switch 11 is in the off state.
  • the power supply device 1 can be operated normally even when the switch 11 is in the off state. That is, the set of the capacitor 10a and the like is provided to duplicate the set of the capacitor 10 and the like. Based on the above, in FIG. 1, the switch 11a is turned on while the switch 11 is turned off.
  • each configuration of the power supply device 1 will be described. However, as described above, since each configuration of the set of the capacitor 10a and the like is the same as each configuration of the set of the capacitor 10 and the like, only each configuration of the set of the capacitor 10 and the like will be described, and each configuration of the set of the capacitor 10a and the like will be described. The description of the configuration will be omitted.
  • the capacitor 10 smoothes the power supplied through the transformer 15 and the diode 14.
  • the capacitor 10 is, for example, an aluminum electrolytic capacitor.
  • the capacitor 10 has a life characteristic as shown in FIG. 2, for example.
  • the life characteristic of a capacitor is the relationship between the deterioration of the capacitor and the capacity of the capacitor. In general, as the usage time of the capacitor becomes longer, the deterioration of the capacitor progresses and the capacity of the capacitor decreases. In each of A, B, and C shown in FIG. 2, the remaining life of the capacitor 10 is halved, the remaining life of the capacitor 10 is reduced and the replacement of the power supply device 1 is recommended, and the life of the capacitor 10 is exhausted. It shows that the normal operation of the power supply device 1 is difficult.
  • the capacitor 10 is an example of a capacitor according to the present invention.
  • the switch 11 is connected to the wire L1 and the other end is connected to the capacitor 10.
  • the switch 11 is turned on and off by the control of the switch control unit 162 of the control unit 16 described later.
  • the switch 11 is turned off, the capacitor 10 is electrically disconnected from the wire L1.
  • the switch 11 is a switching element such as a relay or a transistor that is turned on / off by control.
  • the switch 11 is an example of the first switch according to the present invention.
  • the switch 12 is connected in series with the resistor 13. Like the switch 11, the switch 12 is turned on and off under the control of the switch control unit 162. When the switch 12 is turned on, the electric charge accumulated in the capacitor 10 can be discharged by the resistor 13. Like the switch 11, the switch 12 is a switching element such as a relay or a transistor that is turned on / off by control.
  • the switch 12 is an example of the second switch according to the present invention.
  • the resistor 13 is connected in parallel with the capacitor 10.
  • the resistor 13 discharges the electric charge accumulated in the capacitor 10 in response to the switch 12 being turned on.
  • the resistor 13 is an example of the resistor according to the present invention.
  • the diode 14 rectifies the current flowing from the transformer 15. Due to the rectification by the diode 14, the potential of the line L1 becomes equal to or higher than the potential of the line L2.
  • the transformer 15 transforms the electric power supplied from the primary side and supplies it to the secondary side. Since the power supply device 1 is a power supply device based on the flyback method, the transformer 15 stores electric power when the switch on the primary side is on, and supplies electric power to the secondary side when the switch on the primary side is off.
  • the control unit 16 controls the power supply device 1 in an integrated manner.
  • the control unit 16 includes, for example, a microprocessor as a hardware configuration. Each function of the control unit 16 is realized by the CPU (Central Processing Unit) of the microcontroller executing the control program stored in the ROM (Read Only Memory). Alternatively, the control unit 16 may include a control circuit using an ASIC (Application Specific Integrated Circuit: integrated circuit for a specific application), an FPGA (Field Programmable Gate Array), or the like. In this case, each function of the control unit 16 is realized by the control circuit.
  • ASIC Application Specific Integrated Circuit: integrated circuit for a specific application
  • FPGA Field Programmable Gate Array
  • the control unit 16 includes a voltage value detection unit 161, a switch control unit 162, a capacity calculation unit 163, a life diagnosis unit 164, and a notification control unit 165 as functional configurations.
  • the control unit 16 controls each of these functional units in order to diagnose the life of the capacitor 10 or the capacitor 10a at regular intervals such as every hour and every 8 hours.
  • the voltage value detection unit 161 detects the voltage values of the capacitor 10 and the capacitor 10a.
  • the voltage value detection unit 161 is realized by, for example, an A / D (Analog to Digital) converter provided in a microcontroller.
  • the voltage value detected by the voltage value detection unit 161 is used for calculating the capacity of the capacitor 10 by the capacity calculation unit 163 described later.
  • the voltage value detecting unit 161 is an example of the voltage value detecting means according to the present invention.
  • the switch control unit 162 controls on / off switching of the switch 11, the switch 12, the switch 11a, and the switch 12a.
  • the switch control unit 162 is an example of the switch control means according to the present invention.
  • the switch control unit 162 turns on the switch 11 and the switch 11a and turns off the switch 12 and the switch 12a.
  • both the capacitor 10 and the capacitor 10a can be smoothed, and unnecessary discharge by the resistor 13 and the resistor 13a can be prevented.
  • FIG. 3 shows the on / off change of the switch 11 and the switch 12, and the corresponding change of the voltage value of the capacitor 10.
  • the switch control unit 162 turns off the switch 11 at time t1.
  • the influence of the ripple component generated on the wire L1 is eliminated, and the charge accumulated in the capacitor 10 is not discharged by the load 2, so that the voltage of the capacitor 10 is stable.
  • the resistor 13 does not discharge.
  • the voltage value V1 is detected by the voltage value detection unit 161 by the time t2 described later.
  • the time t1 is an example of the first time according to the present invention
  • the voltage value V1 is an example of the first voltage value according to the present invention.
  • the switch control unit 162 turns on the switch 12 at the time t2 when the elapsed time T1 has elapsed from the time t1. Then, the discharge by the resistor 13 is started, and the voltage of the capacitor 10 gradually decreases.
  • the elapsed time T1 is an example of the first elapsed time according to the present invention
  • the time t2 is an example of the second time according to the present invention.
  • the switch control unit 162 turns off the switch 12 at the time t3 when the elapsed time T2 has elapsed from the time t2. Then, the discharge by the resistor 13 is stopped, and the voltage of the capacitor 10 becomes stable.
  • time t4 which will be described later, the voltage value V2 is detected by the voltage value detection unit 161, the capacity of the capacitor 10 is calculated by the capacity calculation unit 163, and the life of the capacitor 10 is diagnosed by the life diagnosis unit 164.
  • the elapsed time T2 is an example of the second elapsed time according to the present invention
  • the time t3 is an example of the third time according to the present invention
  • the voltage value V2 is the second voltage value according to the present invention. This is an example.
  • the switch control unit 162 turns on the switch 11 at the time t4 when the elapsed time T3 has elapsed from the time t3. Then, the electric power is supplied from the wire L1, the electric charge is accumulated in the capacitor 10, and the voltage of the capacitor 10 rises.
  • the elapsed time T3 is an example of the third elapsed time according to the present invention
  • the time t4 is an example of the fourth time according to the present invention.
  • the switch control by the switch control unit 162 when the control unit 16 diagnoses the life of the capacitor 10a is exactly the same as when diagnosing the life of the capacitor 10, so the description thereof will be omitted.
  • the capacity calculation unit 163 will be described with reference to FIGS. 1 and 3.
  • the capacitance calculation unit 163 calculates the capacitance of the capacitor 10 based on the voltage value V1, the voltage value V2, the elapsed time T2, and the resistance value of the resistor 13 described above.
  • the capacitance calculation unit 163 also calculates the capacitance of the capacitor 10a in the same manner.
  • the capacity calculation unit 163 is an example of the capacity calculation means according to the present invention.
  • the voltage value V1 is the voltage value of the capacitor 10 before the discharge by the resistor 13 is performed.
  • the voltage value V2 is the voltage value of the capacitor 10 after being discharged by the resistor 13.
  • the elapsed time T2 is the time during which the discharge by the resistor 13 is performed.
  • the capacitance of the capacitor 10 can be obtained based on the following equation (1).
  • C is the capacitance of the capacitor 10
  • R is the resistance value of the resistor 13
  • ln is a logarithm function with the natural logarithm as the base.
  • C T2 / (R ⁇ ln (V1 / V2)) (1)
  • the capacitance calculation unit 163 calculates the capacitance of the capacitor 10 based on the equation (1) with reference to the information indicating the resistance value of the resistor 13 stored in the storage unit 17.
  • the life diagnosis unit 164 diagnoses the life of the capacitor 10 based on the capacity of the capacitor 10 calculated by the capacity calculation unit 163 and the life characteristics of the capacitor 10 as shown in FIG.
  • the life diagnosis unit 164 also diagnoses the life of the capacitor 10a in the same manner.
  • the life diagnosis unit 164 is an example of the life diagnosis means according to the present invention.
  • the life diagnosis unit 164 diagnoses the life of the capacitor 10 by referring to the information stored in the storage unit 17 indicating the life characteristics of the capacitor 10.
  • the life diagnosis unit 164 compares the magnitude of the capacity with the capacity of the capacitor 10 calculated by the capacity calculation unit 163, and the deterioration of the capacitor 10 is to the extent that replacement of the power supply device 1 is recommended.
  • the life of the capacitor 10 is diagnosed by determining whether or not it has advanced.
  • the capacity indicated by the information stored in the storage unit 17 serves as a threshold value in the life diagnosis. Also in this case, since the threshold value is a value obtained based on the life characteristic of the capacitor 10, it can be said that the life diagnosis unit 164 diagnoses the life of the capacitor 10 based on the life characteristic of the capacitor 10.
  • the notification control unit 165 controls the notification device 3 to notify the user of the diagnosis result by the life diagnosis unit 164.
  • the details of the notification device 3 will be described later.
  • the notification control unit 165 does not have to perform any notification when it is not necessary to notify the diagnosis result. For example, when the diagnosis result is notified only when the replacement of the power supply device 1 is recommended, the notification control unit 165 does not have to notify the diagnosis result when the life of the capacitor 10 is sufficiently remaining.
  • the storage unit 17 stores information indicating the resistance value of the resistor 13, information indicating the resistance value of the resistor 13a, information indicating the life characteristic of the capacitor 10, and information indicating the life characteristic of the capacitor 10a.
  • the storage unit 17 may store the above-mentioned threshold values in the capacitor 10 and the capacitor 10a instead of the information indicating the life characteristic of the capacitor 10 and the information indicating the life characteristic of the capacitor 10a.
  • the load 2 is a load driven by DC power supplied by the power supply device 1, and is, for example, a DC motor.
  • One end of the load 2 is connected to the wire L1 of the power supply device 1, and the other end of the load 2 is connected to the wire L2 of the power supply device 1.
  • the load 2 is an example of the load according to the present invention.
  • the notification device 3 notifies the user of the diagnosis result regarding the life of the capacitor 10 and the capacitor 10a.
  • the notification device 3 is, for example, a lamp that emits green, yellow, and red light.
  • the notification device 3 emits green light when the life of the capacitor 10 and the life of the capacitor 10a are sufficiently remaining, for example, based on the control by the notification control unit 165 of the control unit 16, and the power supply device 1 should be replaced.
  • yellow light is emitted
  • red light is emitted.
  • the notification device 3 may be a lamp that emits only red light.
  • the notification device 3 when the deterioration of the capacitor 10 or the capacitor 10a has progressed to the extent that the power supply device 1 should be replaced based on the control by the notification control unit 165, for example, the notification device 3 has a life of the capacitor 10 or the capacitor 10a. It emits red light (including when it is exhausted). For example, when the diagnosis by the lifespan diagnosis unit 164 is performed based on the threshold value, such a notification mode is used.
  • the notification device 3 may be a speaker that sounds a buzzer sound in addition to the lamp, or may be a display capable of displaying the diagnosis result in detail.
  • FIG. 4 As described above, the operation shown in FIG. 4 is executed, for example, at regular time intervals. Further, at the start of the operation shown in FIG. 4, as described above, the switch 11 and the switch 11a are in the on state, and the switch 12 and the switch 12a are in the off state. Further, the operation of the life diagnosis of the capacitor 10 will be described below. Since the life diagnosis of the capacitor 10a is the same as that of the capacitor 10, the description thereof will be omitted.
  • the switch control unit 162 of the control unit 16 of the power supply device 1 turns off the switch 11 (step S101).
  • the time when this operation is executed is the time t1 in FIG.
  • the switch 11 is turned off, the voltage of the capacitor 10 is stabilized.
  • step S101 the voltage value detection unit 161 of the control unit 16 detects the voltage value V1 of the capacitor 10 by the time t2 (step S102). However, if the operation of step S102 is executed immediately after step S101, the voltage value of the capacitor 10 is detected before the voltage of the capacitor 10 stabilizes, which is not preferable.
  • the switch control unit 162 turns on the switch 12 (step S103).
  • the time when this operation is executed is the time t2 in FIG.
  • the switch 12 is turned on, the discharge by the resistor 13 is started.
  • the switch control unit 162 turns off the switch 12 (step S104).
  • the time when this operation is executed is the time t3 in FIG.
  • the switch 12 is turned off, the discharge by the resistor 13 is completed, and the voltage of the capacitor 10 is stabilized.
  • step S104 the voltage value detection unit 161 of the control unit 16 detects the voltage value V2 of the capacitor 10 by the time t4 (step S105).
  • the switch control unit 162 turns on the switch 11 (step S106).
  • the time when this operation is executed is the time t4 in FIG.
  • the switch 11 is turned on, electric charges are accumulated from the wire L1 to the capacitor 10, and the voltage of the capacitor 10 rises.
  • the capacitance calculation unit 163 of the control unit 16 has the voltage value V1 detected in step S102, the voltage value V2 detected in step S105, the elapsed time T2, and the resistance of the resistor 13 stored in the storage unit 17.
  • the capacitance of the capacitor 10 is calculated based on the information indicating the value (step S107).
  • the life diagnosis unit 164 of the control unit 16 diagnoses the life of the capacitor 10 based on the capacity of the capacitor 10 calculated in step S107 and the information indicating the life characteristics of the capacitor 10 stored in the storage unit 17. (Step S108).
  • Control unit 165 controls the notification device 3 to notify the user of the diagnosis result obtained in step S108 (step S109). Then, the control unit 16 ends the operation of the life diagnosis.
  • step S106 may be executed after any of the operations of steps S107 to S109.
  • the power supply device 1 has been described above. According to the power supply device 1, since the switch 11 is turned off at the time t1 and the switch 12 is turned on at the time t2 after the elapsed time T1 has elapsed, the voltage of the capacitor 10 from the time t1 to t2 can be stabilized. That is, according to the power supply device 1, the voltage between both ends of the capacitor 10 at the start of discharge is stable.
  • the switch 12 is turned off at the time t3 to end the discharge, and the switch 11 is turned on at the time t4 after the elapsed time T3 elapses. It can be stabilized.
  • the elapsed time T2 which is the time during which the discharge by the resistor 13 is performed, is a time irrelevant to the voltage value of the capacitor, and the capacitor 10 is stable before and after the discharge.
  • the life of the capacitor 10 can be diagnosed with high accuracy based on the detected voltage value of the capacitor 10. Similarly, the life of the capacitor 10a can be diagnosed with high accuracy.
  • the voltage value detection unit 161 detects the voltage value V1 of the capacitor 10 once between the time t1 and the time t2, and sets the voltage value V2 of the capacitor 10 by 1 between the time t3 and the time t4. Detected times. However, the voltage value detection unit 161 detects the voltage value V1 of the capacitor 10 a plurality of times between the time t1 and the time t2, and detects the voltage value V2 of the capacitor 10 a plurality of times between the time t3 and the time t4. You may.
  • the capacitance calculation unit 163 may calculate the capacitance of the capacitor 10 based on the average value of the voltage values V1 detected a plurality of times and the average value of the voltage values V2 detected a plurality of times.
  • the average value of the voltage values detected a plurality of times it is possible to further suppress the decrease in the accuracy of the life diagnosis due to the influence of noise, and the life of the capacitor 10 can be diagnosed with high accuracy. It should be noted that only one of the voltage value V1 and the voltage value V2 may be detected a plurality of times.
  • the power supply device 1 diagnoses the life of both the capacitor 10 and the capacitor 10a.
  • the power supply device 1 may diagnose the life of only one capacitor 10.
  • the power supply device 1 is provided with a switch 11b and a capacitor 10b connected in series between the wire L1 and the wire L2.
  • the switch control unit 162 turns on the switch 11b only when diagnosing the life of the capacitor 10, and turns off the switch 11b at other times.
  • the circuit configuration can be made simpler than that of the first embodiment while enabling the diagnosis of the life of the capacitor 10.
  • the switch 11b is turned on and the electric charge is accumulated in the capacitor 10b only when diagnosing the life of the capacitor 10, there is almost no possibility that the life of the capacitor 10b will expire before the capacitor 10.
  • the capacity calculation unit 163 calculates the capacity of the capacitor 10, and the life diagnosis unit 164 diagnoses the life of the capacitor 10 based on the calculated capacity.
  • the life diagnosis unit 164 can also diagnose the life of the capacitor 10 without calculating the capacity of the capacitor 10 by the capacity calculation unit 163.
  • the elapsed time T2 and the resistance value R of the resistor 13 are known. Therefore, the capacitance C is determined based on the ratio of the voltage value V1 and the voltage value V2. Therefore, the life characteristic of the capacitor 10 can also be expressed by the relationship between the deterioration of the capacitor 10 and V1 / V2.
  • the life diagnosis unit 164 can diagnose the life of the capacitor 10 based on the voltage value V1 and the voltage value V2, not necessarily based on the capacitance of the capacitor 10.
  • the stable voltage value V2 of the capacitor 10 is detected by turning off the switch 12 at the time t3.
  • the voltage value of the capacitor 10 may be detected at time t3 without turning off the switch 12, and this voltage value may be set as the voltage value V2. Also in this case, since the voltage between both ends of the capacitor 10 at the start of discharge is stable, the life of the capacitor 10 can be diagnosed accurately.

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  • Physics & Mathematics (AREA)
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  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

This power supply device (1) comprises a switch (11), a capacitor (10), a resistor (13), a switch (12), a voltage value detection unit (161) for detecting voltage values of the capacitor (10), a switch control unit (162) for controlling the switch (11) and switch (12), and a lifespan diagnosis unit (164) for diagnosing the lifespan of the capacitor (10). The switch control unit (162) turns the switch (11) off at a first time and turns the switch (12) on at a second time. The voltage value detection unit (161) detects a first voltage value of the capacitor (10) from the first time to the second time and a second voltage value of the capacitor (10) at a third time. The lifespan diagnosis unit (164) diagnoses the lifespan of the capacitor (10) on the basis of the first voltage value and second voltage value.

Description

電源装置及び寿命診断方法Power supply and life diagnosis method
　本発明は、電源装置及び寿命診断方法に関する。 The present invention relates to a power supply device and a life diagnosis method.
　電源装置には、電圧の平滑化のために寿命部品であるコンデンサが使用されている。コンデンサの劣化が進むにつれて、コンデンサの容量が低下するので電源装置が正常に動作しなくなる可能性が高くなる。そのため、コンデンサの寿命を診断する技術が必要とされている。 The power supply uses a capacitor, which is a life component, for voltage smoothing. As the deterioration of the capacitor progresses, the capacity of the capacitor decreases, so that there is a high possibility that the power supply device will not operate normally. Therefore, a technique for diagnosing the life of a capacitor is required.
　特許文献１及び２には、コンデンサへの電力供給を停止したのちにコンデンサと並列接続された抵抗によりコンデンサに蓄積された電荷を放電させ、放電開始からコンデンサの電圧値が予め定められた電圧値に到達するまでに要した時間に基づいてコンデンサの寿命を診断する技術が開示されている。 In Patent Documents 1 and 2, after the power supply to the capacitor is stopped, the electric charge accumulated in the capacitor is discharged by a resistor connected in parallel with the capacitor, and the voltage value of the capacitor is a predetermined voltage value from the start of discharge. A technique for diagnosing the life of a capacitor based on the time required to reach is disclosed.
特開平０６－１６５５２３号公報Japanese Unexamined Patent Publication No. 06-165523 国際公開第２００８／０１６０５０号International Publication No. 2008/016050
　特許文献１においては、コンデンサとパワートランジスタモジュールとが常に並列接続されているため、コンデンサに蓄積された電荷がパワートランジスタモジュールでも放電されるので、放電開始時におけるコンデンサの電圧が安定しないという問題がある。 In Patent Document 1, since the capacitor and the power transistor module are always connected in parallel, the electric charge accumulated in the capacitor is also discharged even in the power transistor module, so that there is a problem that the voltage of the capacitor at the start of discharge is not stable. is there.
　特許文献２においては、コンデンサと抵抗とが常に並列接続されているため、コンデンサへの電力供給を断つと即座に放電が開始されるので、放電開始時におけるコンデンサの電圧がリップル成分により安定しないという問題がある。 In Patent Document 2, since the capacitor and the resistor are always connected in parallel, the discharge is started immediately when the power supply to the capacitor is cut off, so that the voltage of the capacitor at the start of discharge is not stable due to the ripple component. There's a problem.
　したがって、特許文献１及び２のいずれにおいても、放電開始時におけるコンデンサの電圧が安定しないため、放電時間も安定せず、寿命診断の精度が悪くなるという問題がある。 Therefore, in both Patent Documents 1 and 2, there is a problem that the voltage of the capacitor at the start of discharge is not stable, the discharge time is not stable, and the accuracy of the life diagnosis is deteriorated.
　さらに、特許文献１及び２のいずれにおいても、コンデンサの電圧値が予め定められた電圧値に到達するまでに要した時間に基づいてコンデンサの寿命を診断するので、リップル成分、ノイズ等により電圧値が変動すると当該時間も変動し、寿命診断の精度が悪くなるという問題がある。 Further, in both Patent Documents 1 and 2, since the life of the capacitor is diagnosed based on the time required for the voltage value of the capacitor to reach a predetermined voltage value, the voltage value is based on ripple components, noise, etc. If the value fluctuates, the time also fluctuates, and there is a problem that the accuracy of life diagnosis deteriorates.
　上記の事情に鑑み、本発明の目的は、コンデンサの寿命を精度良く診断できる電源装置等を提供することにある。 In view of the above circumstances, an object of the present invention is to provide a power supply device or the like capable of accurately diagnosing the life of a capacitor.
　上記の目的を達成するため、本発明に係る電源装置は、
　第１の線と、
　前記第１の線より低電位の第２の線と、
　一端が前記第１の線に接続された第１のスイッチと、
　一端が前記第１のスイッチに接続され他端が前記第２の線に接続されたコンデンサと、
　前記コンデンサに並列に接続された抵抗と、
　前記抵抗に直列に接続された第２のスイッチと、
　前記コンデンサの両端間の電圧値を検出する電圧値検出手段と、
　前記第１のスイッチと前記第２のスイッチとを制御するスイッチ制御手段と、
　前記コンデンサの寿命を診断する寿命診断手段と、
　を備え、
　前記スイッチ制御手段は、前記第１のスイッチがオン状態かつ前記第２のスイッチがオフ状態であるときに第１の時刻に達すると前記第１のスイッチをオフし、前記第１の時刻から第１の経過時間が経過した第２の時刻に前記第２のスイッチをオンし、
　前記電圧値検出手段は、前記第１の時刻から前記第２の時刻までの間における前記コンデンサの第１の電圧値と、前記第２の時刻から第２の経過時間が経過した第３の時刻における前記コンデンサの第２の電圧値とを検出し、
　前記寿命診断手段は、前記第１の電圧値と前記第２の電圧値とに基づいて前記コンデンサの寿命を診断する。 In order to achieve the above object, the power supply device according to the present invention
The first line and
The second line, which has a lower potential than the first line,
A first switch whose one end is connected to the first wire,
A capacitor with one end connected to the first switch and the other end connected to the second wire.
A resistor connected in parallel with the capacitor
A second switch connected in series with the resistor,
A voltage value detecting means for detecting a voltage value between both ends of the capacitor and
A switch control means for controlling the first switch and the second switch,
Life diagnostic means for diagnosing the life of the capacitor and
With
When the first time is reached when the first switch is on and the second switch is off, the switch control means turns off the first switch, and the first switch is turned off from the first time. At the second time when the elapsed time of 1 has elapsed, the second switch is turned on, and the second switch is turned on.
The voltage value detecting means has a first voltage value of the capacitor between the first time and the second time, and a third time when the second elapsed time has elapsed from the second time. The second voltage value of the capacitor in
The life diagnosis means diagnoses the life of the capacitor based on the first voltage value and the second voltage value.
　本発明によれば、第１のスイッチをオフしてから第１の経過時間の経過後に第２のスイッチをオンすることにより、放電開始時におけるコンデンサの両端間の電圧が安定する。したがって、本発明によれば、精度良くコンデンサの寿命を診断できる。 According to the present invention, the voltage between both ends of the capacitor at the start of discharge is stabilized by turning on the second switch after the lapse of the first elapsed time after turning off the first switch. Therefore, according to the present invention, the life of the capacitor can be diagnosed with high accuracy.
本発明の実施の形態に係る電源装置の構成を示す図The figure which shows the structure of the power-source device which concerns on embodiment of this invention. 本発明の実施の形態に係るコンデンサの寿命特性の一例を示す図The figure which shows an example of the life characteristic of the capacitor which concerns on embodiment of this invention. 本発明の実施の形態における、スイッチのオン・オフとコンデンサの電圧値との関係の一例を示す図The figure which shows an example of the relationship between the on / off of a switch and the voltage value of a capacitor in embodiment of this invention. 本発明の実施の形態に係る電源装置による寿命診断の動作の一例を示すフローチャートA flowchart showing an example of the operation of the life diagnosis by the power supply device according to the embodiment of the present invention. 本発明の実施の形態の変形例２に係る電源装置の構成を示す図The figure which shows the structure of the power-source device which concerns on the modification 2 of the Embodiment of this invention.
　以下、図面を参照しながら、本発明の実施の形態に係る電源装置を説明する。各図面においては、同一又は同等の部分に同一の符号を付す。 Hereinafter, the power supply device according to the embodiment of the present invention will be described with reference to the drawings. In each drawing, the same or equivalent parts are designated by the same reference numerals.
　また、以下の説明では、「コンデンサの両端間の電圧」「コンデンサの両端間の電圧値」などのことを単に「コンデンサの電圧」「コンデンサの電圧値」とも表現する。また、「コンデンサの寿命の診断」とは、コンデンサの劣化がどの程度進んでいるかを判定すること、コンデンサをあとどの程度まで使用可能であるかを判定すること、コンデンサの劣化が交換すべき程度にまで進んでいるか否かを判定することなど、コンデンサの劣化に関する判定をすることを広く含むものである。 In the following explanation, "voltage between both ends of the capacitor" and "voltage value between both ends of the capacitor" are also simply expressed as "voltage of the capacitor" and "voltage value of the capacitor". In addition, "diagnosis of capacitor life" is to determine how much the deterioration of the capacitor has progressed, how much the capacitor can be used, and how much the deterioration of the capacitor should be replaced. It broadly includes determining the deterioration of the capacitor, such as determining whether or not the capacitor has progressed to.
（実施の形態）
　図１を参照しながら、実施の形態に係る電源装置１を説明する。電源装置１は、自身に設けられているコンデンサの寿命を診断し、診断結果を報知することができる電源装置である。電源装置１は、コンデンサ１０とスイッチ１１とスイッチ１２と抵抗１３とコンデンサ１０ａとスイッチ１１ａとスイッチ１２ａと抵抗１３ａとダイオード１４とトランス１５と制御部１６と記憶部１７と線Ｌ１と線Ｌ２を備える。電源装置１は、直流電力により負荷２を駆動する。電源装置１は、報知装置３を制御してコンデンサ１０及びコンデンサ１０ａの寿命についての診断結果を報知する。電源装置１は、本発明に係る電源装置の一例である。また、線Ｌ１は本発明に係る第１の線の一例であり、線Ｌ２は本発明に係る第２の線の一例である。 (Embodiment)
The power supply device 1 according to the embodiment will be described with reference to FIG. The power supply device 1 is a power supply device capable of diagnosing the life of a capacitor provided in itself and notifying the diagnosis result. The power supply device 1 includes a capacitor 10, a switch 11, a switch 12, a resistor 13, a capacitor 10a, a switch 11a, a switch 12a, a resistor 13a, a diode 14, a transformer 15, a control unit 16, a storage unit 17, a line L1 and a line L2. .. The power supply device 1 drives the load 2 with DC power. The power supply device 1 controls the notification device 3 to notify the diagnosis result of the life of the capacitor 10 and the capacitor 10a. The power supply device 1 is an example of the power supply device according to the present invention. Further, the line L1 is an example of the first line according to the present invention, and the line L2 is an example of the second line according to the present invention.
　図１に示す電源装置１において、トランス１５を基準として左側が一次側であり、右側が二次側である。図１では、一次側についての記載を省略している。以下の説明でも、一次側についての説明は省略する。図１に示すトランス１５の左上及び右下に記載されている黒丸は、トランス１５の巻線の極性を示す。トランス１５の巻線の極性と、ダイオード１４の配置とからわかるとおり、電源装置１はフライバック方式による電源装置である。 In the power supply device 1 shown in FIG. 1, the left side is the primary side and the right side is the secondary side with respect to the transformer 15. In FIG. 1, the description about the primary side is omitted. In the following description, the description of the primary side will be omitted. The black circles on the upper left and lower right of the transformer 15 shown in FIG. 1 indicate the polarity of the winding of the transformer 15. As can be seen from the polarity of the winding of the transformer 15 and the arrangement of the diodes 14, the power supply device 1 is a power supply device by a flyback method.
　コンデンサ１０、スイッチ１１、スイッチ１２及び抵抗１３のセット（以下、コンデンサ１０等のセットという）と、コンデンサ１０ａ、スイッチ１１ａ、スイッチ１２ａ及び抵抗１３ａのセット（以下、コンデンサ１０ａ等のセットという）とは、ほぼ同様の構成である。ただし、各素子の特性は同一でなくてもよい。 What is a set of capacitor 10, switch 11, switch 12 and resistor 13 (hereinafter referred to as a set of capacitor 10 and the like) and a set of capacitor 10a, switch 11a, switch 12a and resistor 13a (hereinafter referred to as a set of capacitor 10a and the like)? , It has almost the same configuration. However, the characteristics of each element do not have to be the same.
　詳細は後述するが、コンデンサ１０の寿命を診断するためには、スイッチ１１をオフする必要がある。スイッチ１１がオフ状態のときにも電源装置１を正常に動作させるために、コンデンサ１０ａ等のセットが設けられている。スイッチ１１ａをオンすることにより、スイッチ１１がオフ状態のときにも電源装置１を正常に動作させることができる。つまり、コンデンサ１０ａ等のセットは、コンデンサ１０等のセットを二重化するために設けられている。なお、上記を踏まえて、図１では、スイッチ１１がオフ状態となっているのにあわせてスイッチ１１ａがオン状態となっている。 Details will be described later, but in order to diagnose the life of the capacitor 10, it is necessary to turn off the switch 11. A set of capacitors 10a and the like is provided in order to operate the power supply device 1 normally even when the switch 11 is in the off state. By turning on the switch 11a, the power supply device 1 can be operated normally even when the switch 11 is in the off state. That is, the set of the capacitor 10a and the like is provided to duplicate the set of the capacitor 10 and the like. Based on the above, in FIG. 1, the switch 11a is turned on while the switch 11 is turned off.
　次に、電源装置１の各構成を説明する。ただし、上述のとおり、コンデンサ１０ａ等のセットの各構成は、コンデンサ１０等のセットの各構成と同様であるため、コンデンサ１０等のセットの各構成についてのみ説明し、コンデンサ１０ａ等のセットの各構成については説明を省略する。 Next, each configuration of the power supply device 1 will be described. However, as described above, since each configuration of the set of the capacitor 10a and the like is the same as each configuration of the set of the capacitor 10 and the like, only each configuration of the set of the capacitor 10 and the like will be described, and each configuration of the set of the capacitor 10a and the like will be described. The description of the configuration will be omitted.
　コンデンサ１０は、一端がスイッチ１１に接続され他端が線Ｌ２に接続されている。コンデンサ１０は、トランス１５及びダイオード１４を介して供給される電力を平滑化する。コンデンサ１０は、例えばアルミ電解コンデンサである。コンデンサ１０は、例えば図２に示すような寿命特性を有する。コンデンサの寿命特性とは、コンデンサの劣化とコンデンサの容量との関係性のことである。一般的に、コンデンサの使用時間が長くなるとコンデンサの劣化が進み、コンデンサの容量が低下する。図２に示すＡ，Ｂ，Ｃのそれぞれは、コンデンサ１０の残り寿命が半分となった点、コンデンサ１０の残り寿命が少なくなり電源装置１の交換が推奨される点、コンデンサ１０の寿命が尽きて電源装置１の正常動作が困難となっている点を示す。コンデンサ１０は、本発明に係るコンデンサの一例である。 One end of the capacitor 10 is connected to the switch 11 and the other end is connected to the wire L2. The capacitor 10 smoothes the power supplied through the transformer 15 and the diode 14. The capacitor 10 is, for example, an aluminum electrolytic capacitor. The capacitor 10 has a life characteristic as shown in FIG. 2, for example. The life characteristic of a capacitor is the relationship between the deterioration of the capacitor and the capacity of the capacitor. In general, as the usage time of the capacitor becomes longer, the deterioration of the capacitor progresses and the capacity of the capacitor decreases. In each of A, B, and C shown in FIG. 2, the remaining life of the capacitor 10 is halved, the remaining life of the capacitor 10 is reduced and the replacement of the power supply device 1 is recommended, and the life of the capacitor 10 is exhausted. It shows that the normal operation of the power supply device 1 is difficult. The capacitor 10 is an example of a capacitor according to the present invention.
　再び図１を参照する。スイッチ１１は、一端が線Ｌ１に接続され他端がコンデンサ１０に接続されている。スイッチ１１は、後述の制御部１６のスイッチ制御部１６２の制御によりオン・オフする。スイッチ１１がオフすることにより、コンデンサ１０は線Ｌ１から電気的に切り離される。スイッチ１１は、リレー、トランジスタなどの、制御によりオン・オフするスイッチング素子である。スイッチ１１は、本発明に係る第１のスイッチの一例である。 Refer to Fig. 1 again. One end of the switch 11 is connected to the wire L1 and the other end is connected to the capacitor 10. The switch 11 is turned on and off by the control of the switch control unit 162 of the control unit 16 described later. When the switch 11 is turned off, the capacitor 10 is electrically disconnected from the wire L1. The switch 11 is a switching element such as a relay or a transistor that is turned on / off by control. The switch 11 is an example of the first switch according to the present invention.
　スイッチ１２は、抵抗１３に直列に接続されている。スイッチ１２は、スイッチ１１と同様、スイッチ制御部１６２の制御によりオン・オフする。スイッチ１２がオンすることにより、コンデンサ１０に蓄積された電荷を抵抗１３によって放電することができる。スイッチ１２はスイッチ１１と同様、リレー、トランジスタなどの、制御によりオン・オフするスイッチング素子である。スイッチ１２は、本発明に係る第２のスイッチの一例である。 The switch 12 is connected in series with the resistor 13. Like the switch 11, the switch 12 is turned on and off under the control of the switch control unit 162. When the switch 12 is turned on, the electric charge accumulated in the capacitor 10 can be discharged by the resistor 13. Like the switch 11, the switch 12 is a switching element such as a relay or a transistor that is turned on / off by control. The switch 12 is an example of the second switch according to the present invention.
　抵抗１３は、コンデンサ１０と並列に接続されている。抵抗１３は、スイッチ１２がオンするのに応じて、コンデンサ１０に蓄積された電荷を放電する。抵抗１３は、本発明に係る抵抗の一例である。 The resistor 13 is connected in parallel with the capacitor 10. The resistor 13 discharges the electric charge accumulated in the capacitor 10 in response to the switch 12 being turned on. The resistor 13 is an example of the resistor according to the present invention.
　ダイオード１４は、トランス１５から流れる電流を整流する。ダイオード１４による整流により、線Ｌ１の電位は線Ｌ２の電位以上となる。 The diode 14 rectifies the current flowing from the transformer 15. Due to the rectification by the diode 14, the potential of the line L1 becomes equal to or higher than the potential of the line L2.
　トランス１５は、一次側から供給される電力を変圧して二次側に供給する。電源装置１はフライバック方式による電源装置であるため、トランス１５は、一次側のスイッチがオン状態のとき電力を蓄積し、オフ状態のとき二次側に電力を供給する。 The transformer 15 transforms the electric power supplied from the primary side and supplies it to the secondary side. Since the power supply device 1 is a power supply device based on the flyback method, the transformer 15 stores electric power when the switch on the primary side is on, and supplies electric power to the secondary side when the switch on the primary side is off.
　制御部１６は、電源装置１を統括制御する。制御部１６は、ハードウェア構成として、例えばマイクロコントローラを備える。当該マイクロコントローラのＣＰＵ（Central Processing Unit：中央演算装置）が、ＲＯＭ（Read Only Memory）に格納された制御プログラムを実行することにより、制御部１６の各機能が実現される。あるいは、制御部１６は、ＡＳＩＣ（Application Specific Integrated Circuit：特定用途向け集積回路）、ＦＰＧＡ（Field Programmable Gate Array）等による制御回路を備えてもよい。この場合、当該制御回路により制御部１６の各機能が実現される。 The control unit 16 controls the power supply device 1 in an integrated manner. The control unit 16 includes, for example, a microprocessor as a hardware configuration. Each function of the control unit 16 is realized by the CPU (Central Processing Unit) of the microcontroller executing the control program stored in the ROM (Read Only Memory). Alternatively, the control unit 16 may include a control circuit using an ASIC (Application Specific Integrated Circuit: integrated circuit for a specific application), an FPGA (Field Programmable Gate Array), or the like. In this case, each function of the control unit 16 is realized by the control circuit.
　制御部１６は、機能的構成として、電圧値検出部１６１とスイッチ制御部１６２と容量算出部１６３と寿命診断部１６４と報知制御部１６５とを備える。制御部１６は、１時間ごと、８時間ごとなどの一定時間ごとに、コンデンサ１０あるいはコンデンサ１０ａの寿命を診断するために、これらの各機能部を制御する。 The control unit 16 includes a voltage value detection unit 161, a switch control unit 162, a capacity calculation unit 163, a life diagnosis unit 164, and a notification control unit 165 as functional configurations. The control unit 16 controls each of these functional units in order to diagnose the life of the capacitor 10 or the capacitor 10a at regular intervals such as every hour and every 8 hours.
　電圧値検出部１６１は、コンデンサ１０及びコンデンサ１０ａの電圧値を検出する。電圧値検出部１６１は、例えばマイクロコントローラに設けられたＡ／Ｄ（Analog to Digital）コンバータにより実現される。電圧値検出部１６１により検出された電圧値は、後述の容量算出部１６３による、コンデンサ１０の容量の算出に使用される。電圧値検出部１６１は、本発明に係る電圧値検出手段の一例である。 The voltage value detection unit 161 detects the voltage values of the capacitor 10 and the capacitor 10a. The voltage value detection unit 161 is realized by, for example, an A / D (Analog to Digital) converter provided in a microcontroller. The voltage value detected by the voltage value detection unit 161 is used for calculating the capacity of the capacitor 10 by the capacity calculation unit 163 described later. The voltage value detecting unit 161 is an example of the voltage value detecting means according to the present invention.
　スイッチ制御部１６２は、スイッチ１１、スイッチ１２、スイッチ１１ａ及びスイッチ１２ａのオン・オフの切り替えを制御する。スイッチ制御部１６２は、本発明に係るスイッチ制御手段の一例である。 The switch control unit 162 controls on / off switching of the switch 11, the switch 12, the switch 11a, and the switch 12a. The switch control unit 162 is an example of the switch control means according to the present invention.
　以下、スイッチ１１によるスイッチ制御の一例を示す。制御部１６がコンデンサ１０及びコンデンサ１０ａのいずれについても寿命を診断しないとき、スイッチ制御部１６２は、スイッチ１１及びスイッチ１１ａをオンし、スイッチ１２及びスイッチ１２ａをオフする。これにより、コンデンサ１０及びコンデンサ１０ａの双方で平滑化をすることができ、かつ抵抗１３及び抵抗１３ａによる不要な放電を防ぐことができる。 The following is an example of switch control by the switch 11. When the control unit 16 does not diagnose the life of either the capacitor 10 or the capacitor 10a, the switch control unit 162 turns on the switch 11 and the switch 11a and turns off the switch 12 and the switch 12a. As a result, both the capacitor 10 and the capacitor 10a can be smoothed, and unnecessary discharge by the resistor 13 and the resistor 13a can be prevented.
　図３を参照しながら、制御部１６がコンデンサ１０の寿命を診断するときのスイッチ制御部１６２によるスイッチ制御を説明する。図３には、スイッチ１１及びスイッチ１２のオン・オフの変化と、それに対応するコンデンサ１０の電圧値の変化とが示されている。なお、寿命診断の開始前には、上記のとおり、スイッチ１１及びスイッチ１１ａがオン状態であり、スイッチ１２及びスイッチ１２ａがオフ状態であるものとする。また、このとき、図３に示すように、線Ｌ１に生じているリップル成分の影響によりコンデンサ１０の電圧がやや不安定となっている。 The switch control by the switch control unit 162 when the control unit 16 diagnoses the life of the capacitor 10 will be described with reference to FIG. FIG. 3 shows the on / off change of the switch 11 and the switch 12, and the corresponding change of the voltage value of the capacitor 10. Before the start of the life diagnosis, it is assumed that the switch 11 and the switch 11a are in the on state and the switch 12 and the switch 12a are in the off state as described above. Further, at this time, as shown in FIG. 3, the voltage of the capacitor 10 is slightly unstable due to the influence of the ripple component generated on the line L1.
　まず、スイッチ制御部１６２は、時刻ｔ１にスイッチ１１をオフする。このとき、線Ｌ１に生じているリップル成分の影響がなくなり、コンデンサ１０に蓄積された電荷が負荷２により放電されることもないので、コンデンサ１０の電圧が安定する。このとき、スイッチ１２はまだオフ状態であるため、抵抗１３による放電は行われない。また、後述の時刻ｔ２までに、電圧値検出部１６１により電圧値Ｖ１が検出される。時刻ｔ１は、本発明に係る第１の時刻の一例であり、電圧値Ｖ１は、本発明に係る第１の電圧値の一例である。 First, the switch control unit 162 turns off the switch 11 at time t1. At this time, the influence of the ripple component generated on the wire L1 is eliminated, and the charge accumulated in the capacitor 10 is not discharged by the load 2, so that the voltage of the capacitor 10 is stable. At this time, since the switch 12 is still in the off state, the resistor 13 does not discharge. Further, the voltage value V1 is detected by the voltage value detection unit 161 by the time t2 described later. The time t1 is an example of the first time according to the present invention, and the voltage value V1 is an example of the first voltage value according to the present invention.
　次に、スイッチ制御部１６２は、時刻ｔ１から経過時間Ｔ１が経過した時刻ｔ２に、スイッチ１２をオンする。すると、抵抗１３による放電が開始され、コンデンサ１０の電圧が徐々に低下する。経過時間Ｔ１は、本発明に係る第１の経過時間の一例であり、時刻ｔ２は、本発明に係る第２の時刻の一例である。 Next, the switch control unit 162 turns on the switch 12 at the time t2 when the elapsed time T1 has elapsed from the time t1. Then, the discharge by the resistor 13 is started, and the voltage of the capacitor 10 gradually decreases. The elapsed time T1 is an example of the first elapsed time according to the present invention, and the time t2 is an example of the second time according to the present invention.
　次に、スイッチ制御部１６２は、時刻ｔ２から経過時間Ｔ２が経過した時刻ｔ３に、スイッチ１２をオフする。すると、抵抗１３による放電が停止され、コンデンサ１０の電圧が安定する。後述の時刻ｔ４までに、電圧値検出部１６１により電圧値Ｖ２が検出され、容量算出部１６３によりコンデンサ１０の容量が算出され、寿命診断部１６４によりコンデンサ１０の寿命が診断される。経過時間Ｔ２は、本発明に係る第２の経過時間の一例であり、時刻ｔ３は、本発明に係る第３の時刻の一例であり、電圧値Ｖ２は、本発明に係る第２の電圧値の一例である。 Next, the switch control unit 162 turns off the switch 12 at the time t3 when the elapsed time T2 has elapsed from the time t2. Then, the discharge by the resistor 13 is stopped, and the voltage of the capacitor 10 becomes stable. By time t4, which will be described later, the voltage value V2 is detected by the voltage value detection unit 161, the capacity of the capacitor 10 is calculated by the capacity calculation unit 163, and the life of the capacitor 10 is diagnosed by the life diagnosis unit 164. The elapsed time T2 is an example of the second elapsed time according to the present invention, the time t3 is an example of the third time according to the present invention, and the voltage value V2 is the second voltage value according to the present invention. This is an example.
　そして、スイッチ制御部１６２は、時刻ｔ３から経過時間Ｔ３が経過した時刻ｔ４に、スイッチ１１をオンする。すると、線Ｌ１から電力の供給を受けて、コンデンサ１０に電荷が蓄積され、コンデンサ１０の電圧が上昇する。経過時間Ｔ３は、本発明に係る第３の経過時間の一例であり、時刻ｔ４は、本発明に係る第４の時刻の一例である。 Then, the switch control unit 162 turns on the switch 11 at the time t4 when the elapsed time T3 has elapsed from the time t3. Then, the electric power is supplied from the wire L1, the electric charge is accumulated in the capacitor 10, and the voltage of the capacitor 10 rises. The elapsed time T3 is an example of the third elapsed time according to the present invention, and the time t4 is an example of the fourth time according to the present invention.
　制御部１６がコンデンサ１０ａの寿命を診断するときのスイッチ制御部１６２によるスイッチ制御については、コンデンサ１０の寿命を診断するときと全く同様であるため、説明を省略する。 The switch control by the switch control unit 162 when the control unit 16 diagnoses the life of the capacitor 10a is exactly the same as when diagnosing the life of the capacitor 10, so the description thereof will be omitted.
　図１及び図３を参照しながら、容量算出部１６３を説明する。容量算出部１６３は、上述した電圧値Ｖ１、電圧値Ｖ２及び経過時間Ｔ２と、抵抗１３の抵抗値とに基づいて、コンデンサ１０の容量を算出する。容量算出部１６３は、コンデンサ１０ａの容量も同様に算出する。容量算出部１６３は、本発明に係る容量算出手段の一例である。 The capacity calculation unit 163 will be described with reference to FIGS. 1 and 3. The capacitance calculation unit 163 calculates the capacitance of the capacitor 10 based on the voltage value V1, the voltage value V2, the elapsed time T2, and the resistance value of the resistor 13 described above. The capacitance calculation unit 163 also calculates the capacitance of the capacitor 10a in the same manner. The capacity calculation unit 163 is an example of the capacity calculation means according to the present invention.
　以下ではコンデンサ１０の容量の算出のみについて説明する。電圧値Ｖ１は、抵抗１３による放電が行われる前のコンデンサ１０の電圧値である。電圧値Ｖ２は、抵抗１３による放電が行われた後のコンデンサ１０の電圧値である。経過時間Ｔ２は、抵抗１３による放電が行われた時間である。コンデンサ１０の容量は、以下の式（１）に基づいて求めることができる。ただし、Ｃはコンデンサ１０の容量、Ｒは抵抗１３の抵抗値、ｌｎは自然対数を底とする対数関数である。
　Ｃ＝Ｔ２／（Ｒ×ｌｎ（Ｖ１／Ｖ２））　　　（１） In the following, only the calculation of the capacitance of the capacitor 10 will be described. The voltage value V1 is the voltage value of the capacitor 10 before the discharge by the resistor 13 is performed. The voltage value V2 is the voltage value of the capacitor 10 after being discharged by the resistor 13. The elapsed time T2 is the time during which the discharge by the resistor 13 is performed. The capacitance of the capacitor 10 can be obtained based on the following equation (1). However, C is the capacitance of the capacitor 10, R is the resistance value of the resistor 13, and ln is a logarithm function with the natural logarithm as the base.
C = T2 / (R × ln (V1 / V2)) (1)
　なお、詳細は後述するが、抵抗１３の抵抗値を示す情報が記憶部１７に保存されている。容量算出部１６３は、記憶部１７に保存されている、抵抗１３の抵抗値を示す情報を参照し、式（１）に基づいてコンデンサ１０の容量を算出する。 Although details will be described later, information indicating the resistance value of the resistor 13 is stored in the storage unit 17. The capacitance calculation unit 163 calculates the capacitance of the capacitor 10 based on the equation (1) with reference to the information indicating the resistance value of the resistor 13 stored in the storage unit 17.
　寿命診断部１６４は、容量算出部１６３により算出されたコンデンサ１０の容量と、図２に示すようなコンデンサ１０の寿命特性とに基づいて、コンデンサ１０の寿命を診断する。寿命診断部１６４は、コンデンサ１０ａの寿命も同様に診断する。寿命診断部１６４は、本発明に係る寿命診断手段の一例である。 The life diagnosis unit 164 diagnoses the life of the capacitor 10 based on the capacity of the capacitor 10 calculated by the capacity calculation unit 163 and the life characteristics of the capacitor 10 as shown in FIG. The life diagnosis unit 164 also diagnoses the life of the capacitor 10a in the same manner. The life diagnosis unit 164 is an example of the life diagnosis means according to the present invention.
　詳細は後述するが、コンデンサ１０の寿命特性を示す情報が記憶部１７に保存されている。寿命診断部１６４は、記憶部１７に保存されている、コンデンサ１０の寿命特性を示す情報を参照して、コンデンサ１０の寿命を診断する。 Details will be described later, but information indicating the life characteristics of the capacitor 10 is stored in the storage unit 17. The life diagnosis unit 164 diagnoses the life of the capacitor 10 by referring to the information stored in the storage unit 17 indicating the life characteristics of the capacitor 10.
　なお、コンデンサ１０の寿命特性を示す情報に代えて、図２に示すＢ点におけるコンデンサ１０の容量を示す情報が記憶部１７に保存されるものであってもよい。この場合、寿命診断部１６４は、当該容量と、容量算出部１６３により算出されたコンデンサ１０の容量との大小を比較して、電源装置１の交換が推奨される程度までにコンデンサ１０の劣化が進んでいるか否かを判定することにより、コンデンサ１０の寿命を診断する。この場合、記憶部１７に保存されている情報が示す容量は、寿命診断における閾値となる。この場合も、当該閾値はコンデンサ１０の寿命特性に基づいて得られる値であるため、寿命診断部１６４は、コンデンサ１０の寿命特性に基づいてコンデンサ１０の寿命を診断する、といえる。 Note that, instead of the information indicating the life characteristic of the capacitor 10, the information indicating the capacity of the capacitor 10 at the point B shown in FIG. 2 may be stored in the storage unit 17. In this case, the life diagnosis unit 164 compares the magnitude of the capacity with the capacity of the capacitor 10 calculated by the capacity calculation unit 163, and the deterioration of the capacitor 10 is to the extent that replacement of the power supply device 1 is recommended. The life of the capacitor 10 is diagnosed by determining whether or not it has advanced. In this case, the capacity indicated by the information stored in the storage unit 17 serves as a threshold value in the life diagnosis. Also in this case, since the threshold value is a value obtained based on the life characteristic of the capacitor 10, it can be said that the life diagnosis unit 164 diagnoses the life of the capacitor 10 based on the life characteristic of the capacitor 10.
　再び図１を参照する。報知制御部１６５は、報知装置３を制御して、寿命診断部１６４による診断結果をユーザに報知する。報知装置３の詳細は後述する。ただし、報知制御部１６５は、診断結果を報知する必要がない場合には、何ら報知をしなくともよい。例えば、電源装置１の交換が推奨されるときのみ診断結果を報知する場合、コンデンサ１０の寿命が十分に残っているときには、報知制御部１６５は診断結果を報知しなくてもよい。 Refer to Fig. 1 again. The notification control unit 165 controls the notification device 3 to notify the user of the diagnosis result by the life diagnosis unit 164. The details of the notification device 3 will be described later. However, the notification control unit 165 does not have to perform any notification when it is not necessary to notify the diagnosis result. For example, when the diagnosis result is notified only when the replacement of the power supply device 1 is recommended, the notification control unit 165 does not have to notify the diagnosis result when the life of the capacitor 10 is sufficiently remaining.
　記憶部１７は、抵抗１３の抵抗値を示す情報と、抵抗１３ａの抵抗値を示す情報と、コンデンサ１０の寿命特性を示す情報と、コンデンサ１０ａの寿命特性を示す情報とを保存する。ただし、上述したとおり、記憶部１７は、コンデンサ１０の寿命特性を示す情報及びコンデンサ１０ａの寿命特性を示す情報に代えて、コンデンサ１０及びコンデンサ１０ａにおける上述の閾値を保存してもよい。 The storage unit 17 stores information indicating the resistance value of the resistor 13, information indicating the resistance value of the resistor 13a, information indicating the life characteristic of the capacitor 10, and information indicating the life characteristic of the capacitor 10a. However, as described above, the storage unit 17 may store the above-mentioned threshold values in the capacitor 10 and the capacitor 10a instead of the information indicating the life characteristic of the capacitor 10 and the information indicating the life characteristic of the capacitor 10a.
　次に、負荷２及び報知装置３を説明する。負荷２は、電源装置１が供給する直流電力により駆動される負荷であり、例えば直流モータである。負荷２の一端は電源装置１の線Ｌ１に接続され、負荷２の他端は電源装置１の線Ｌ２に接続されている。負荷２は、本発明に係る負荷の一例である。 Next, the load 2 and the notification device 3 will be described. The load 2 is a load driven by DC power supplied by the power supply device 1, and is, for example, a DC motor. One end of the load 2 is connected to the wire L1 of the power supply device 1, and the other end of the load 2 is connected to the wire L2 of the power supply device 1. The load 2 is an example of the load according to the present invention.
　報知装置３は、コンデンサ１０及びコンデンサ１０ａの寿命についての診断結果をユーザに報知する。報知装置３は、例えば緑色、黄色及び赤色の光を発するランプである。報知装置３は、例えば制御部１６の報知制御部１６５による制御に基づいて、コンデンサ１０の寿命及びコンデンサ１０ａの寿命が十分に残っているときには緑色の光を発し、電源装置１を交換すべき程度にまでコンデンサ１０又はコンデンサ１０ａの劣化が進んでいるときには黄色の光を発し、コンデンサ１０又はコンデンサ１０ａの寿命が尽きているときには赤色の光を発する。 The notification device 3 notifies the user of the diagnosis result regarding the life of the capacitor 10 and the capacitor 10a. The notification device 3 is, for example, a lamp that emits green, yellow, and red light. The notification device 3 emits green light when the life of the capacitor 10 and the life of the capacitor 10a are sufficiently remaining, for example, based on the control by the notification control unit 165 of the control unit 16, and the power supply device 1 should be replaced. When the deterioration of the capacitor 10 or the capacitor 10a has progressed, yellow light is emitted, and when the life of the capacitor 10 or the capacitor 10a has expired, red light is emitted.
　あるいは、報知装置３は、赤色の光のみを発するランプであってもよい。この場合、報知装置３は、例えば報知制御部１６５による制御に基づいて、電源装置１を交換すべき程度にまでコンデンサ１０又はコンデンサ１０ａの劣化が進んでいるとき（コンデンサ１０又はコンデンサ１０ａの寿命が尽きているときも含む）に赤色の光を発する。例えば、寿命診断部１６４による診断が閾値に基づいて行われるときには、このような報知態様となる。 Alternatively, the notification device 3 may be a lamp that emits only red light. In this case, when the deterioration of the capacitor 10 or the capacitor 10a has progressed to the extent that the power supply device 1 should be replaced based on the control by the notification control unit 165, for example, the notification device 3 has a life of the capacitor 10 or the capacitor 10a. It emits red light (including when it is exhausted). For example, when the diagnosis by the lifespan diagnosis unit 164 is performed based on the threshold value, such a notification mode is used.
　また、報知装置３は、ランプのほか、ブザー音を鳴らすスピーカであってもよいし、診断結果を詳細に表示可能なディスプレイであってもよい。 Further, the notification device 3 may be a speaker that sounds a buzzer sound in addition to the lamp, or may be a display capable of displaying the diagnosis result in detail.
　次に、図４及び図３を参照しながら、電源装置１による寿命診断の動作の一例を説明する。図４に示す動作は、上述したとおり、例えば一定時間ごとに実行される。また、図４に示す動作の開始時には、上述したとおり、スイッチ１１及びスイッチ１１ａはオン状態であり、スイッチ１２及びスイッチ１２ａはオフ状態である。また、以下ではコンデンサ１０の寿命診断の動作を説明する。コンデンサ１０ａの寿命診断は、コンデンサ１０の場合と同様であるため説明を省略する。 Next, an example of the operation of the life diagnosis by the power supply device 1 will be described with reference to FIGS. 4 and 3. As described above, the operation shown in FIG. 4 is executed, for example, at regular time intervals. Further, at the start of the operation shown in FIG. 4, as described above, the switch 11 and the switch 11a are in the on state, and the switch 12 and the switch 12a are in the off state. Further, the operation of the life diagnosis of the capacitor 10 will be described below. Since the life diagnosis of the capacitor 10a is the same as that of the capacitor 10, the description thereof will be omitted.
　電源装置１の制御部１６のスイッチ制御部１６２は、スイッチ１１をオフする（ステップＳ１０１）。この動作が実行された時刻が、図３における時刻ｔ１である。スイッチ１１がオフすることにより、コンデンサ１０の電圧が安定する。 The switch control unit 162 of the control unit 16 of the power supply device 1 turns off the switch 11 (step S101). The time when this operation is executed is the time t1 in FIG. When the switch 11 is turned off, the voltage of the capacitor 10 is stabilized.
　ステップＳ１０１の実行後、時刻がｔ２になるまでに、制御部１６の電圧値検出部１６１は、コンデンサ１０の電圧値Ｖ１を検出する（ステップＳ１０２）。ただし、ステップＳ１０１の直後にステップＳ１０２の動作を実行すると、コンデンサ１０の電圧が安定する前にコンデンサ１０の電圧値を検出することとなるため、好ましくない。 After the execution of step S101, the voltage value detection unit 161 of the control unit 16 detects the voltage value V1 of the capacitor 10 by the time t2 (step S102). However, if the operation of step S102 is executed immediately after step S101, the voltage value of the capacitor 10 is detected before the voltage of the capacitor 10 stabilizes, which is not preferable.
　時刻ｔ１から経過時間Ｔ１経過後、スイッチ制御部１６２は、スイッチ１２をオンする（ステップＳ１０３）。この動作が実行された時刻が、図３における時刻ｔ２である。スイッチ１２がオンすることにより、抵抗１３による放電が開始される。 After the elapsed time T1 has elapsed from the time t1, the switch control unit 162 turns on the switch 12 (step S103). The time when this operation is executed is the time t2 in FIG. When the switch 12 is turned on, the discharge by the resistor 13 is started.
　ステップＳ１０３から経過時間Ｔ２経過後、スイッチ制御部１６２は、スイッチ１２をオフする（ステップＳ１０４）。この動作が実行された時刻が、図３における時刻ｔ３である。スイッチ１２がオフすることにより、抵抗１３による放電が終了し、コンデンサ１０の電圧が安定する。 After the elapsed time T2 has elapsed from step S103, the switch control unit 162 turns off the switch 12 (step S104). The time when this operation is executed is the time t3 in FIG. When the switch 12 is turned off, the discharge by the resistor 13 is completed, and the voltage of the capacitor 10 is stabilized.
　ステップＳ１０４の実行後、時刻がｔ４になるまでに、制御部１６の電圧値検出部１６１は、コンデンサ１０の電圧値Ｖ２を検出する（ステップＳ１０５）。 After the execution of step S104, the voltage value detection unit 161 of the control unit 16 detects the voltage value V2 of the capacitor 10 by the time t4 (step S105).
　ステップＳ１０４から経過時間Ｔ３経過後、スイッチ制御部１６２は、スイッチ１１をオンする（ステップＳ１０６）。この動作が実行された時刻が、図３における時刻ｔ４である。スイッチ１１がオンすることにより、線Ｌ１からコンデンサ１０に電荷が蓄積され、コンデンサ１０の電圧が上昇する。 After the elapsed time T3 has elapsed from step S104, the switch control unit 162 turns on the switch 11 (step S106). The time when this operation is executed is the time t4 in FIG. When the switch 11 is turned on, electric charges are accumulated from the wire L1 to the capacitor 10, and the voltage of the capacitor 10 rises.
　制御部１６の容量算出部１６３は、ステップＳ１０２にて検出された電圧値Ｖ１と、ステップＳ１０５にて検出された電圧値Ｖ２と、経過時間Ｔ２と、記憶部１７に保存された抵抗１３の抵抗値を示す情報とに基づいて、コンデンサ１０の容量を算出する（ステップＳ１０７）。 The capacitance calculation unit 163 of the control unit 16 has the voltage value V1 detected in step S102, the voltage value V2 detected in step S105, the elapsed time T2, and the resistance of the resistor 13 stored in the storage unit 17. The capacitance of the capacitor 10 is calculated based on the information indicating the value (step S107).
　制御部１６の寿命診断部１６４は、ステップＳ１０７にて算出されたコンデンサ１０の容量と、記憶部１７に保存されたコンデンサ１０の寿命特性を示す情報とに基づいて、コンデンサ１０の寿命を診断する（ステップＳ１０８）。 The life diagnosis unit 164 of the control unit 16 diagnoses the life of the capacitor 10 based on the capacity of the capacitor 10 calculated in step S107 and the information indicating the life characteristics of the capacitor 10 stored in the storage unit 17. (Step S108).
　制御部１６の報知制御部１６５は、報知装置３を制御して、ステップＳ１０８で得られた診断結果をユーザに報知する（ステップＳ１０９）。そして制御部１６は、寿命診断の動作を終了する。 Notification of control unit 16 Control unit 165 controls the notification device 3 to notify the user of the diagnosis result obtained in step S108 (step S109). Then, the control unit 16 ends the operation of the life diagnosis.
　なお、ステップＳ１０６の動作は、ステップＳ１０７からステップＳ１０９のいずれかの動作の後に実行されてもよい。 The operation of step S106 may be executed after any of the operations of steps S107 to S109.
　以上、実施の形態に係る電源装置１を説明した。電源装置１によれば、時刻ｔ１にスイッチ１１をオフし、経過時間Ｔ１経過後の時刻ｔ２にスイッチ１２をオンするので、時刻ｔ１からｔ２までにおけるコンデンサ１０の電圧を安定させることができる。つまり、電源装置１によれば、放電開始時におけるコンデンサ１０の両端間の電圧が安定する。 The power supply device 1 according to the embodiment has been described above. According to the power supply device 1, since the switch 11 is turned off at the time t1 and the switch 12 is turned on at the time t2 after the elapsed time T1 has elapsed, the voltage of the capacitor 10 from the time t1 to t2 can be stabilized. That is, according to the power supply device 1, the voltage between both ends of the capacitor 10 at the start of discharge is stable.
　また、電源装置１によれば、時刻ｔ３にスイッチ１２をオフして放電を終了し、経過時間Ｔ３経過後の時刻ｔ４にスイッチ１１をオンするので、時刻ｔ３からｔ４までにおけるコンデンサ１０の電圧を安定させることができる。 Further, according to the power supply device 1, the switch 12 is turned off at the time t3 to end the discharge, and the switch 11 is turned on at the time t4 after the elapsed time T3 elapses. It can be stabilized.
　また、電源装置１によれば、抵抗１３による放電が行われる時間である経過時間Ｔ２は、コンデンサの電圧値とは無関係の時間であり、かつ放電の前後におけるコンデンサ１０が安定する。 Further, according to the power supply device 1, the elapsed time T2, which is the time during which the discharge by the resistor 13 is performed, is a time irrelevant to the voltage value of the capacitor, and the capacitor 10 is stable before and after the discharge.
　したがって、電源装置１によれば、精度良くコンデンサ１０の電圧値を検出できるので、検出したコンデンサ１０の電圧値に基づいて精度良くコンデンサ１０の寿命を診断できる。また、コンデンサ１０ａについても同様に、精度良く寿命を診断できる。 Therefore, according to the power supply device 1, since the voltage value of the capacitor 10 can be detected with high accuracy, the life of the capacitor 10 can be diagnosed with high accuracy based on the detected voltage value of the capacitor 10. Similarly, the life of the capacitor 10a can be diagnosed with high accuracy.
（変形例１）
　実施の形態では、電圧値検出部１６１は、時刻ｔ１から時刻ｔ２までの間にコンデンサ１０の電圧値Ｖ１を１回検出し、時刻ｔ３から時刻ｔ４までの間にコンデンサ１０の電圧値Ｖ２を１回検出した。しかし、電圧値検出部１６１は、時刻ｔ１から時刻ｔ２までの間にコンデンサ１０の電圧値Ｖ１を複数回検出し、時刻ｔ３から時刻ｔ４までの間にコンデンサ１０の電圧値Ｖ２を複数回検出してもよい。そして容量算出部１６３は、複数回検出された電圧値Ｖ１の平均値と、複数回検出された電圧値Ｖ２の平均値とに基づいて、コンデンサ１０の容量を算出してもよい。複数回検出された電圧値の平均値を使用することにより、ノイズの影響による寿命診断の精度の低下をさらに抑えることができ、精度良くコンデンサ１０の寿命を診断できる。なお、電圧値Ｖ１と電圧値Ｖ２とのうち、一方のみを複数回検出するものであってもよい。 (Modification example 1)
In the embodiment, the voltage value detection unit 161 detects the voltage value V1 of the capacitor 10 once between the time t1 and the time t2, and sets the voltage value V2 of the capacitor 10 by 1 between the time t3 and the time t4. Detected times. However, the voltage value detection unit 161 detects the voltage value V1 of the capacitor 10 a plurality of times between the time t1 and the time t2, and detects the voltage value V2 of the capacitor 10 a plurality of times between the time t3 and the time t4. You may. Then, the capacitance calculation unit 163 may calculate the capacitance of the capacitor 10 based on the average value of the voltage values V1 detected a plurality of times and the average value of the voltage values V2 detected a plurality of times. By using the average value of the voltage values detected a plurality of times, it is possible to further suppress the decrease in the accuracy of the life diagnosis due to the influence of noise, and the life of the capacitor 10 can be diagnosed with high accuracy. It should be noted that only one of the voltage value V1 and the voltage value V2 may be detected a plurality of times.
（変形例２）
　実施の形態では、電源装置１は、コンデンサ１０とコンデンサ１０ａとの双方について寿命を診断する。しかし、電源装置１は、１つのコンデンサ１０についてのみ寿命を診断するものであってもよい。例えば図５に示すように、コンデンサ１０ａ等のセットに代えて、線Ｌ１と線Ｌ２との間にスイッチ１１ｂとコンデンサ１０ｂとを直列に接続したものを電源装置１に設ける。そしてスイッチ制御部１６２は、コンデンサ１０の寿命を診断するときのみスイッチ１１ｂをオンし、それ以外のときにはスイッチ１１ｂをオフする。このような構成により、コンデンサ１０の寿命の診断を可能としつつ、回路構成を実施の形態１よりも簡素なものとすることができる。また、コンデンサ１０の寿命を診断するときのみスイッチ１１ｂがオンし、コンデンサ１０ｂに電荷が蓄積されるので、コンデンサ１０ｂがコンデンサ１０よりも先に寿命が尽きる可能性はほとんどない。 (Modification 2)
In the embodiment, the power supply device 1 diagnoses the life of both the capacitor 10 and the capacitor 10a. However, the power supply device 1 may diagnose the life of only one capacitor 10. For example, as shown in FIG. 5, instead of the set of the capacitor 10a and the like, the power supply device 1 is provided with a switch 11b and a capacitor 10b connected in series between the wire L1 and the wire L2. Then, the switch control unit 162 turns on the switch 11b only when diagnosing the life of the capacitor 10, and turns off the switch 11b at other times. With such a configuration, the circuit configuration can be made simpler than that of the first embodiment while enabling the diagnosis of the life of the capacitor 10. Further, since the switch 11b is turned on and the electric charge is accumulated in the capacitor 10b only when diagnosing the life of the capacitor 10, there is almost no possibility that the life of the capacitor 10b will expire before the capacitor 10.
（変形例３）
　実施の形態では、容量算出部１６３によりコンデンサ１０の容量を算出し、寿命診断部１６４は算出された容量に基づいてコンデンサ１０の寿命を診断した。しかし、寿命診断部１６４は、容量算出部１６３によりコンデンサ１０の容量を算出することなくコンデンサ１０の寿命を診断することもできる。上述の式（１）において、経過時間Ｔ２及び抵抗１３の抵抗値Ｒは既知である。そのため、容量Ｃは、電圧値Ｖ１と電圧値Ｖ２との比に基づいて決定される。したがって、コンデンサ１０の寿命特性は、コンデンサ１０の劣化とＶ１／Ｖ２との関係によっても表すことができる。コンデンサ１０の劣化とＶ１／Ｖ２との関係によって表された寿命特性を示す情報を記憶部１７に保存することにより、コンデンサ１０の容量を算出することなくコンデンサ１０の寿命を診断することができる。つまり、寿命診断部１６４は、必ずしもコンデンサ１０の容量に基づかなくとも、電圧値Ｖ１と電圧値Ｖ２とに基づいてコンデンサ１０の寿命を診断することができる。 (Modification example 3)
In the embodiment, the capacity calculation unit 163 calculates the capacity of the capacitor 10, and the life diagnosis unit 164 diagnoses the life of the capacitor 10 based on the calculated capacity. However, the life diagnosis unit 164 can also diagnose the life of the capacitor 10 without calculating the capacity of the capacitor 10 by the capacity calculation unit 163. In the above equation (1), the elapsed time T2 and the resistance value R of the resistor 13 are known. Therefore, the capacitance C is determined based on the ratio of the voltage value V1 and the voltage value V2. Therefore, the life characteristic of the capacitor 10 can also be expressed by the relationship between the deterioration of the capacitor 10 and V1 / V2. By storing the information indicating the life characteristic represented by the relationship between the deterioration of the capacitor 10 and V1 / V2 in the storage unit 17, the life of the capacitor 10 can be diagnosed without calculating the capacity of the capacitor 10. That is, the life diagnosis unit 164 can diagnose the life of the capacitor 10 based on the voltage value V1 and the voltage value V2, not necessarily based on the capacitance of the capacitor 10.
（変形例４）
　実施の形態では、時刻ｔ３にスイッチ１２をオフすることにより、安定したコンデンサ１０の電圧値Ｖ２を検出した。しかし、スイッチ１２をオフすることなく時刻ｔ３にコンデンサ１０の電圧値を検出し、この電圧値を電圧値Ｖ２としてもよい。この場合も、放電開始時におけるコンデンサ１０の両端間の電圧は安定するので、精度よくコンデンサ１０の寿命を診断できる。 (Modification example 4)
In the embodiment, the stable voltage value V2 of the capacitor 10 is detected by turning off the switch 12 at the time t3. However, the voltage value of the capacitor 10 may be detected at time t3 without turning off the switch 12, and this voltage value may be set as the voltage value V2. Also in this case, since the voltage between both ends of the capacitor 10 at the start of discharge is stable, the life of the capacitor 10 can be diagnosed accurately.
　本発明は、本発明の広義の精神と範囲を逸脱することなく、様々な実施の形態及び変形が可能とされるものである。また、上述した実施の形態は、本発明を説明するためのものであり、本発明の範囲を限定するものではない。つまり、本発明の範囲は、実施の形態ではなく、請求の範囲によって示される。そして、請求の範囲内及びそれと同等の発明の意義の範囲内で施される様々な変形が、本発明の範囲内とみなされる。 The present invention enables various embodiments and modifications without departing from the broad spirit and scope of the present invention. Moreover, the above-described embodiment is for explaining the present invention, and does not limit the scope of the present invention. That is, the scope of the present invention is indicated not by the embodiment but by the claims. Then, various modifications made within the scope of the claims and within the equivalent meaning of the invention are considered to be within the scope of the present invention.
　１　電源装置、２　負荷、３　報知装置、１０，１０ａ，１０ｂ　コンデンサ、１１，１１ａ，１１ｂ，１２，１２ａ　スイッチ、１３，１３ａ　抵抗、１４　ダイオード、１５　トランス、１６　制御部、１７　記憶部、１６１　電圧値検出部、１６２　スイッチ制御部、１６３　容量算出部、１６４　寿命診断部、１６５　報知制御部、Ｌ１，Ｌ２　線。 1 power supply device, 2 load, 3 notification device, 10, 10a, 10b capacitor, 11, 11a, 11b, 12, 12a switch, 13, 13a resistor, 14 diode, 15 transformer, 16 control unit, 17 storage unit, 161 voltage Value detection unit, 162 switch control unit, 163 capacity calculation unit, 164 life diagnosis unit, 165 notification control unit, L1, L2 lines.

Claims (6)

  1. 　第１の線と、
    　前記第１の線より低電位の第２の線と、
    　一端が前記第１の線に接続された第１のスイッチと、
    　一端が前記第１のスイッチに接続され他端が前記第２の線に接続されたコンデンサと、
    　前記コンデンサに並列に接続された抵抗と、
    　前記抵抗に直列に接続された第２のスイッチと、
    　前記コンデンサの両端間の電圧値を検出する電圧値検出手段と、
    　前記第１のスイッチと前記第２のスイッチとを制御するスイッチ制御手段と、
    　前記コンデンサの寿命を診断する寿命診断手段と、
    　を備え、
    　前記スイッチ制御手段は、前記第１のスイッチがオン状態かつ前記第２のスイッチがオフ状態であるときに第１の時刻に達すると前記第１のスイッチをオフし、前記第１の時刻から第１の経過時間が経過した第２の時刻に前記第２のスイッチをオンし、
    　前記電圧値検出手段は、前記第１の時刻から前記第２の時刻までの間における前記コンデンサの第１の電圧値と、前記第２の時刻から第２の経過時間が経過した第３の時刻における前記コンデンサの第２の電圧値とを検出し、
    　前記寿命診断手段は、前記第１の電圧値と前記第２の電圧値とに基づいて前記コンデンサの寿命を診断する、
    　電源装置。     The first line and
    The second line, which has a lower potential than the first line,
    A first switch whose one end is connected to the first wire,
    A capacitor with one end connected to the first switch and the other end connected to the second wire.
    A resistor connected in parallel with the capacitor
    A second switch connected in series with the resistor,
    A voltage value detecting means for detecting a voltage value between both ends of the capacitor and
    A switch control means for controlling the first switch and the second switch,
    Life diagnostic means for diagnosing the life of the capacitor and
    With
    When the first time is reached when the first switch is on and the second switch is off, the switch control means turns off the first switch, and the first switch is turned off from the first time. At the second time when the elapsed time of 1 has elapsed, the second switch is turned on, and the second switch is turned on.
    The voltage value detecting means has a first voltage value of the capacitor between the first time and the second time, and a third time when the second elapsed time has elapsed from the second time. The second voltage value of the capacitor in
    The life diagnosis means diagnoses the life of the capacitor based on the first voltage value and the second voltage value.
    Power supply.
  2. 　前記第１の電圧値と前記第２の電圧値と前記第２の経過時間と前記抵抗の抵抗値とに基づいて前記コンデンサの容量を算出する容量算出手段をさらに備え、
    　前記寿命診断手段は、前記容量算出手段により算出された前記コンデンサの容量と前記コンデンサの寿命特性とに基づいて前記コンデンサの寿命を診断する、
    　請求項１に記載の電源装置。     A capacitance calculation means for calculating the capacitance of the capacitor based on the first voltage value, the second voltage value, the second elapsed time, and the resistance value of the resistor is further provided.
    The life diagnosis means diagnoses the life of the capacitor based on the capacity of the capacitor calculated by the capacity calculation means and the life characteristics of the capacitor.
    The power supply device according to claim 1.
  3. 　前記電圧値検出手段は、前記第１の時刻から前記第２の時刻までの間に前記第１の電圧値を複数回検出し、
    　前記寿命診断手段は、複数回検出した前記第１の電圧値の平均値に基づいて前記コンデンサの寿命を診断する、
    　請求項１又は２に記載の電源装置。     The voltage value detecting means detects the first voltage value a plurality of times between the first time and the second time.
    The life diagnosis means diagnoses the life of the capacitor based on the average value of the first voltage values detected a plurality of times.
    The power supply device according to claim 1 or 2.
  4. 　前記スイッチ制御手段はさらに、前記第３の時刻に前記第２のスイッチをオフし、前記第３の時刻から第３の経過時間が経過した第４の時刻に前記第１のスイッチをオンし、
    　前記電圧値検出手段は、前記第３の時刻から前記第４の時刻までの間における前記コンデンサの電圧値を前記第２の電圧値として検出する、
    　請求項１から３のいずれか１項に記載の電源装置。     The switch control means further turns off the second switch at the third time, and turns on the first switch at the fourth time when the third elapsed time elapses from the third time.
    The voltage value detecting means detects the voltage value of the capacitor between the third time and the fourth time as the second voltage value.
    The power supply device according to any one of claims 1 to 3.
  5. 　前記電圧値検出手段は、前記第３の時刻から前記第４の時刻までの間に前記第２の電圧値を複数回検出し、
    　前記寿命診断手段は、複数回検出した前記第２の電圧値の平均値に基づいて前記コンデンサの寿命を診断する、
    　請求項４に記載の電源装置。     The voltage value detecting means detects the second voltage value a plurality of times between the third time and the fourth time.
    The life diagnosis means diagnoses the life of the capacitor based on the average value of the second voltage values detected a plurality of times.
    The power supply device according to claim 4.
  6. 　第１の線と、
    　前記第１の線より低電位の第２の線と、
    　一端が前記第１の線に接続された第１のスイッチと、
    　一端が前記第１のスイッチに接続され他端が前記第２の線に接続されたコンデンサと、
    　前記コンデンサに並列に接続された抵抗と、
    　前記抵抗に直列に接続された第２のスイッチと、
    　を備える電源装置の前記コンデンサの寿命を診断する寿命診断方法であって、
    　前記第１のスイッチがオン状態かつ前記第２のスイッチがオフ状態であるときに第１の時刻に達すると前記第１のスイッチをオフし、
    　前記第１の時刻から第１の経過時間が経過した第２の時刻に前記第２のスイッチをオンし、
    　前記第１の時刻から前記第２の時刻までの間における前記コンデンサの電圧値と、前記第２の時刻から第２の経過時間が経過した第３の時刻における前記コンデンサの電圧値とに基づいて前記コンデンサの寿命を診断する、
    　寿命診断方法。     The first line and
    The second line, which has a lower potential than the first line,
    A first switch whose one end is connected to the first wire,
    A capacitor with one end connected to the first switch and the other end connected to the second wire.
    A resistor connected in parallel with the capacitor
    A second switch connected in series with the resistor,
    It is a life diagnosis method for diagnosing the life of the capacitor of the power supply device provided with the above.
    When the first time is reached when the first switch is on and the second switch is off, the first switch is turned off.
    The second switch is turned on at the second time when the first elapsed time has elapsed from the first time.
    Based on the voltage value of the capacitor between the first time and the second time and the voltage value of the capacitor at the third time when the second elapsed time has elapsed from the second time. Diagnose the life of the capacitor,
    Life diagnosis method.
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