WO2022239122A1 - コンデンサ劣化検出装置及びコンバータシステム - Google Patents
コンデンサ劣化検出装置及びコンバータシステム Download PDFInfo
- Publication number
- WO2022239122A1 WO2022239122A1 PCT/JP2021/017920 JP2021017920W WO2022239122A1 WO 2022239122 A1 WO2022239122 A1 WO 2022239122A1 JP 2021017920 W JP2021017920 W JP 2021017920W WO 2022239122 A1 WO2022239122 A1 WO 2022239122A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- capacitor
- deterioration
- filter
- converter
- filter capacitor
- Prior art date
Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 261
- 230000006866 deterioration Effects 0.000 title claims abstract description 102
- 238000001514 detection method Methods 0.000 title claims abstract description 43
- 238000005259 measurement Methods 0.000 claims abstract description 49
- 238000004364 calculation method Methods 0.000 claims abstract description 37
- 238000001914 filtration Methods 0.000 claims description 21
- 238000007689 inspection Methods 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 description 15
- 238000012545 processing Methods 0.000 description 15
- 230000006870 function Effects 0.000 description 6
- 238000004590 computer program Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000008929 regeneration Effects 0.000 description 4
- 238000011069 regeneration method Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 235000019800 disodium phosphate Nutrition 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000001131 transforming effect Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/143—Arrangements for reducing ripples from dc input or output using compensating arrangements
-
- 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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/30—Marginal testing, e.g. by varying supply voltage
- G01R31/3004—Current or voltage test
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
Definitions
- the present invention relates to a capacitor deterioration detection device and a converter system.
- AC power supplied from an AC power supply is converted to DC power by a converter (rectifier). After that, the DC power is further converted into AC power by an inverter, and this AC power is supplied to the motor as motor drive power.
- a PWM converter As a converter in a motor drive device, in addition to a diode rectification type converter, a PWM converter with a power regeneration function that returns the regenerated power generated when the motor decelerates to the three-phase AC power supply side is widely used.
- a PWM converter includes a bridge circuit composed of power elements including diodes and switching elements connected in anti-parallel to the diodes. The PWM converter can perform power conversion bidirectionally between AC power on the AC side and DC power on the DC side by controlling the ON/OFF operation of the switching element according to the PWM control method.
- a high-frequency ripple current is generated on the AC side of the PWM converter by turning on and off the switching elements in the PWM converter.
- a low-pass filter (hereinafter simply referred to as "filter") having a filtering reactor and a filtering capacitor is generally provided on the AC input side of the PWM converter. is.
- a power source a capacitor that smoothes the DC voltage from the power source, an inverter that receives the smoothed DC voltage and generates an AC voltage, and an electrical device that receives the AC voltage and operates.
- a capacitor capacity estimating device for estimating the capacity of the capacitor in an equipment system, wherein the filter design unit generates a filter that removes the influence of the fluctuation from the load fluctuation period, which is the period in which the load applied to the electric equipment fluctuates.
- an interval signal acquisition for acquiring an interval signal of a predetermined period from an input signal containing, as a component, a carrier frequency synchronized with a PWM (Pulse Width Modulation) signal for controlling the inverter, which is included in the AC voltage.
- PWM Pulse Width Modulation
- a frequency domain transforming unit for generating; extracting a frequency component value corresponding to the carrier frequency from the plurality of component values in each of the plurality of frequency domain data; a carrier frequency component extracting unit that generates time series data indicating the plurality of extracted component values in time series by using time values according to the extracted signal; and the filter for the time series data.
- a capacitor capacity estimating unit for estimating the capacity of the capacitor from the processed time series data.
- a capacity estimation device is known (see Patent Document 1, for example).
- an inverter that converts an input DC voltage into an AC voltage for driving a motor by turning on and off an internal power element and outputs the AC voltage to the motor through a motor power line.
- a high-frequency current detection unit for detecting a high-frequency current from the current flowing through the motor power line when applied; and a high-frequency current detected by the high-frequency current detection unit, generated in the motor power line and the motor.
- a stray capacitance estimating unit for estimating the stray capacitance (see, for example, Patent Literature 2).
- an electrode pair consisting of a pair of electrodes arranged inside a compressor that compresses a refrigerant, a capacitor connected in series with the electrode pair, and a measurement object in which the electrode pair and the capacitor are connected in series
- a first power line which is one of the power lines for driving the compressor, is connected to one end of the unit, an inverter for driving the compressor, and a voltage detection unit for measuring the voltage between the electrodes of the electrode pair.
- a circuit board to be inspected having a plurality of patterns provided on the surface thereof, an electrode common to all the surface patterns is arranged, and a probe is brought into contact with the surface pattern to be measured to obtain a high level or Circuit board pattern capacitance measurement in which a low voltage is applied, a low voltage or a high voltage is applied to the common electrode, the current flowing through the surface pattern is measured, and the capacitance between the surface pattern and the common electrode is calculated.
- a method for measuring the pattern capacitance of a circuit board is known, which is characterized by interposing an insulating layer between the circuit board and the common electrode (see, for example, Patent Document 4).
- a capacitor capacity determination device for a power converter is known, which is characterized by providing means for determining the capacitance (see, for example, Patent Document 5).
- a non-polar film capacitor is used for the filter capacitor installed in the filter connected to the AC side of the converter because it is used in an AC circuit.
- a film capacitor is a capacitor that uses a plastic film as a dielectric. As the film capacitor deteriorates, the amount of heat generated increases, and in the worst case, there is a danger of the plastic film igniting. However, even if the film capacitor deteriorates, there is no abnormality in the operation of the converter connected to the filter having the film capacitor, so there is a possibility that the filter will continue to be used without noticing the deterioration of the film capacitor. Deterioration of the film capacitor can be confirmed by a decrease in capacitance, but the capacitance of the film capacitor cannot be measured while the converter is in operation.
- a capacitor deterioration detection device that detects deterioration of a filter capacitor provided in a filter connected to an AC side of a converter includes a current measurement unit that measures current flowing through the filter capacitor. , a calculation unit that calculates a deterioration determination parameter using the measured value of the current measured by the current measurement unit; and a determination unit that determines whether or not there is deterioration.
- the converter system includes a converter that performs power conversion between AC power on the AC side and DC power on the DC side, and a filter that is connected to the AC side of the converter. and the capacitor deterioration detection device for detecting deterioration of the filtering capacitor.
- a capacitor deterioration detection device and a converter system including the same that can easily detect deterioration of a filter capacitor provided in a filter connected to an AC side of a converter. can be done.
- FIG. 1 is a diagram illustrating a capacitor deterioration detection device and a converter system including the same according to an embodiment of the present disclosure
- FIG. FIG. 4 is a diagram illustrating a case where a voltage measuring unit is omitted in a capacitor deterioration detection device and a converter system including the same according to an embodiment of the present disclosure
- 4 is a flowchart showing deterioration determination processing using the capacitance of a filter capacitor in the capacitor deterioration detection device and the converter system including the same according to an embodiment of the present disclosure
- 7 is a flowchart showing a modification of deterioration determination processing using the capacitance of a filter capacitor in the capacitor deterioration detection device and the converter system including the same according to the embodiment of the present disclosure
- It is a figure explaining the dielectric loss tangent of a capacitor.
- 4 is a flowchart showing deterioration determination processing using a dielectric loss tangent of a filter capacitor in the capacitor deterioration detection device and the converter system including
- FIG. 1 is a diagram showing a capacitor deterioration detection device and a converter system including the same according to one embodiment of the present disclosure.
- the type of motor 6 is not particularly limited, and may be, for example, an induction motor or a synchronous motor.
- the number of phases of the AC power supply 4 and the motor 6 is not particularly limited in this embodiment, and may be, for example, three-phase or single-phase. In the example shown in FIG. 1, each of the AC power supply 4 and the motor 6 has three phases.
- the AC power supply 4 include a three-phase 400V AC power supply, a three-phase 200V AC power supply, a three-phase 600V AC power supply, and a single-phase 100V AC power supply.
- Machines provided with the motor 6 include, for example, machine tools, robots, press machines, injection molding machines, and industrial machines.
- the motor driving device 1000 includes a filter 3, a converter system 100 according to an embodiment of the present disclosure, an inverter 5, a DC link capacitor 7, a precharging circuit 8, and a control section 9. .
- the converter system 100 includes a PWM converter 2 and a capacitor deterioration detection device 1 according to an embodiment of the present disclosure.
- the control unit 9 generates a PWM control signal for controlling switching operations of switching elements in the PWM converter 2 and outputs the PWM control signal to the PWM converter 2 .
- the power line for supplying power to the control unit 9 is a separate system from the power line for supplying power from the AC power supply 4 to the PWM converter 2 . In other words, even before the PWM converter 2 is powered on, power is supplied to drive the controller 9 in preparation for the operation at the time when the PWM converter 2 is powered on.
- the PWM converter 2 performs power regeneration by performing power conversion between AC power on the AC side and DC power on the DC side by PWM-controlling the switching operation of the switching element based on the PWM control signal received from the control unit 9. configured as a simple rectifier.
- the PWM converter 2 is composed of a full bridge circuit composed of power elements composed of diodes and switching elements connected in anti-parallel to the diodes. Examples of switching elements include IGBTs, FETs, thyristors, GTOs, and transistors, but other semiconductor elements may also be used.
- the AC power supply 4 is a three-phase AC power supply, so the PWM converter 2 is composed of a three-phase full-bridge circuit.
- the PWM converter 2 When single-phase AC power is supplied from the AC power supply 4, the PWM converter 2 is configured with a single-phase bridge circuit.
- the PWM converter 2 converts AC power input from the AC side into DC power and outputs it to the DC side by controlling the ON/OFF operation of the switching element according to the PWM control method by the control unit 9, and performs a rectification operation to output to the DC side. and a regenerative operation of converting the DC power into AC power by turning on/off the switching element and outputting the DC power to the AC input/output side.
- a filter 3 is connected to the AC side of the PWM converter 2 .
- the filter 3 has a function of absorbing high-frequency ripple current generated on the AC side of the PWM converter 2 by turning on and off the switching elements in the PWM converter 2 .
- the filter 3 has a filtering capacitor 31 , two reactors 32 and a resistor 33 . Since the filter 3 is connected to the AC side of the PWM converter, the filter capacitor 31 is a nonpolar film capacitor because it is used in an AC circuit.
- An example of the filtering capacitor 31 is a film capacitor, but it may be a ceramic capacitor.
- FIG. 1 in order to simplify the drawing, only one phase of the connection relationship between the filter capacitor 31, the reactor 32, and the resistor 33 in the filter 3 is shown.
- the AC power supply 4 is a three-phase AC power supply
- the AC power supply 4 and the PWM converter 2 configured by a three-phase full bridge circuit are electrically connected by a three-phase power line.
- a filter 3 having a filtering capacitor 31, a reactor 32, and a resistor 33 is provided for each of the three-phase power lines, that is, three filters 3 are provided.
- the two reactors 32 connected in series with each other are provided on each of the three-phase power lines that connect the AC power supply 4 and the PWM converter 2 .
- a set consisting of a filtering capacitor 31 and a resistor 33 connected in series with each other is connected to a connection point of the two reactors 32 .
- the order of series connection of the set consisting of the filtering capacitor 31 and the resistor 33 is an example, and the series connection may be in any order other than this.
- the three sets of filters 3 are star-connected (Y-connected). Note that the star connection (Y connection) has been described as an example of the connection between the filters 3, but one end of each filter 3 to which the power line is not connected is connected to the filter capacitor 31 and resistor 33 of another filter 3 and the filter connection. It may be connected to the capacitor 31 to form a delta connection ( ⁇ connection).
- the single-phase power line that electrically connects the AC power supply 4 and the PWM converter 2 configured by a single-phase full-bridge circuit has the connection relationship described above.
- a single filter 3 is provided, which includes a filter capacitor 31, a reactor 32, and a resistor 33.
- a DC link capacitor 7 is provided on the DC side of the PWM converter 2 .
- the DC link capacitor 7 has a function of suppressing the pulsation component of the DC output from the PWM converter 2 and a function of accumulating DC power.
- the DC link capacitor 7 may also be called a smoothing capacitor. Examples of the DC link capacitor 7 include, for example, electrolytic capacitors and film capacitors.
- a pre-charging circuit 8 for pre-charging the DC link capacitor 7 is provided between the PWM converter 2 and the DC link capacitor 7 .
- precharging circuit 8 may be provided on the AC input/output side of PWM converter 2 .
- the preliminary charging circuit 8 has a charging resistor 41 and a preliminary charging switch 42 connected in parallel to the charging resistor 41 .
- the preliminary charging switch 42 is selectively switched between an open state in which an electric path is formed through the charging resistor 41 and a closed state in which a short circuit is formed without the charging resistor 41 .
- a controller for controlling the opening/closing of the preliminary charging switch 42 is not shown, but the controller may be provided in the controller 9 for controlling the switching operation of the switching elements of the PWM converter 2, for example.
- the pre-charging switch 42 is opened so that the direct current output from the PWM converter 2 is transferred to the DC link through the charging resistor 41.
- the preliminary charging switch 42 is switched from the open state to the closed state to complete the preliminary charging.
- a detection unit for detecting the voltage of the DC link capacitor 7 is omitted from the drawing.
- An inverter 5 is connected to the DC side of the PWM converter 2 via a DC link capacitor 7 .
- a circuit portion that electrically connects the DC side of the PWM converter 2 and the DC side of the inverter 5 is called a "DC link”.
- a DC link may also be referred to as a "DC link section,” “DC link,” “DC link section,” “DC bus,” or "DC intermediate circuit.”
- the inverter 5 consists of a switching element and a full bridge circuit of diodes connected in anti-parallel to this.
- switching elements include IGBTs, FETs, thyristors, GTOs, and transistors, but other semiconductor elements may also be used.
- the motor 6 is a three-phase AC motor, so the inverter 5 is configured with a three-phase full-bridge circuit. If the motor 6 is a single-phase AC motor, the inverter 5 is configured with a single-phase bridge circuit.
- the inverter 5 converts the DC power in the DC link into AC power and supplies it to the AC side motor 6 by PWM-controlling the ON/OFF operation of the internal switching elements based on the command from the host controller (not shown). At the same time, the AC power regenerated by the deceleration of the motor 6 is converted into DC power and returned to the DC link.
- the motor 6 has its speed, torque, or rotor position controlled based on the AC power supplied from the inverter 5 .
- a host controller that controls the inverter 5 may be composed of a combination of an analog circuit and an arithmetic processing unit, or may be composed of only an arithmetic processing unit. Arithmetic processing devices that can constitute a host controller that controls the inverter 5 include, for example, ICs, LSIs, CPUs, MPUs, and DSPs.
- the power of the PWM converter 2 is turned on to precharge the DC link capacitor 7.
- “turning on the power of the PWM converter 2” means “starting power supply from the AC power supply 4 to the PWM converter 2". That is, power is not supplied from the AC power supply 4 to the PWM converter 2 before the power of the PWM converter 2 is turned on, and power is supplied from the AC power supply 4 to the PWM converter 2 after the power of the PWM converter 2 is turned on. .
- the switching operation of the switching element in the PWM converter 2 is performed, and the DC link voltage, which is the DC voltage across the DC link capacitor 7, is increased from the peak value of the AC voltage on the AC power supply 4 side. to a higher voltage.
- the step-up of the DC link voltage after completion of preliminary charging of the DC link capacitor 7 will be referred to as "initial step-up”.
- PWM converter 2 transitions to normal operating mode. In the normal operation mode, the PWM converter 2 performs power conversion between AC power on the AC side and DC power on the DC side by PWM-controlling the switching operation of the switching element based on the PWM control signal received from the control unit 9. It operates as a rectifier capable of power regeneration.
- the capacitor deterioration detection device 1 detects deterioration of the filter capacitor 31 provided in the filter 3 connected to the AC side of the PWM converter.
- a filter 3 is provided in each of the three-phase power lines between the AC power supply 4 and the PWM converter 2 configured by a three-phase full bridge circuit. Deterioration of the filter capacitors 31 for each of the filters 3 can be individually detected.
- a period defined from the time when the PWM converter 2 is powered on and pre-charging of the DC link capacitor 7 is started to the time when the initial boosting is started is set as the "test period”.
- the capacitor deterioration detection device 1 detects deterioration of the filter capacitor 31 based on the measured value of the current flowing through the filter capacitor 31 during the inspection period. In this manner, the inspection period is set to the period from the start of precharging of the DC link capacitor 7 to the start of initial boosting. It may be set to a period up to the start time.
- the reason why the detection of deterioration of the filter capacitor 31 is performed based on the measured value of the current flowing through the filter capacitor 31 during the inspection period defined from the start of preliminary charging to the start of initial boosting is as follows. according to. After the PWM converter 2 is powered on, an AC voltage is applied to each power line between the AC power supply 4 and the PWM converter 2. An AC voltage is also applied to the filter 3 connected to the filter 3 , and a current flows through the filter capacitor 31 . Since the switching operation of the switching elements of the PWM converter 2 is performed after the initial boosting start point, including the normal operation mode, the current flowing through the filter capacitor 31 includes a high-frequency ripple current caused by the switching operation of the switching elements. will be included.
- the switching operation of the switching element of the PWM converter 2 is not performed during the period from the time when the power supply of the PWM converter 2 is turned on to the time when the initial boosting is started.
- the resulting high-frequency ripple current does not occur and becomes sinusoidal. If the current flowing through filter capacitor 31 is sinusoidal and does not contain high-frequency ripple current, the capacitance of filter capacitor 31 can be accurately determined using the measured value of this current.
- the capacitance of the filter capacitor 31 decreases and the dielectric loss tangent of the filter capacitor 31 increases.
- a parameter for determining deterioration (capacitance or dielectric loss tangent), and determines whether or not the filter capacitor 31 has deteriorated based on the result of comparison between the deterioration determination parameter and a predetermined reference value.
- the capacitor deterioration detection device 1 includes a current measurement unit 11, a calculation unit 12, a determination unit 13, a voltage measurement unit 14, and an alarm output unit 15.
- the current measurement unit 11 measures the current flowing through the filtering capacitor 31 .
- a current sensor is provided on a lead wire to which the filtering capacitor 31 is connected, and the current measurement unit 11 obtains a measured value of the current flowing through the filtering capacitor 31 via the current sensor.
- the voltage measurement unit 14 measures the power supply voltage on the AC side of the PWM converter 2 .
- the voltage measurement unit 14 acquires a measured value of the power supply voltage via a voltage detection circuit incorporated in the PWM converter 2, for example.
- the "measured value of the power supply voltage” includes the "line voltage between the AC power supply 4 and the filter 3" and the "frequency of the AC power supply 4". Note that the voltage measurement unit 14 may be omitted as in a modified example described later.
- the calculation unit 12 calculates the deterioration determination parameter using the current measured by the current measurement unit 11 during the inspection period defined from the start of preliminary charging to the start of initial boosting. Details of the deterioration determination parameter will be described later.
- the determination unit 13 determines whether or not the filter capacitor 31 has deteriorated based on the result of comparison between the deterioration determination parameter calculated by the calculation unit 12 and the reference value.
- the alarm output unit 15 outputs an alarm when the determination unit 13 determines that the filtering capacitor 31 has deteriorated.
- the alarm output from the alarm output unit 15 is sent to, for example, a display unit (not shown), and the display unit displays, for example, "deterioration of filter capacitor" to notify the operator.
- the display unit include a stand-alone display device, a display device attached to the PWM converter 2, a display device attached to the converter system 100, a display device attached to the motor drive device 1000, and an upper control device (not shown). and display devices attached to personal computers and mobile terminals.
- the alarm output from the alarm output unit 15 is sent to a light-emitting device (not shown) such as an LED or a lamp, and the light-emitting device emits light when receiving the alarm, thereby telling the operator, "Replace the filter capacitor. "Deterioration" is notified.
- the alarm output from the alarm output unit 15 is sent to, for example, an audio device (not shown), and the audio device emits a sound such as voice, speaker, buzzer, chime, etc. when receiving the alarm, Notify the operator of "deterioration of filter capacitor".
- the operator can reliably and easily grasp the deterioration of the filter capacitor 31, and can easily take measures such as replacing the deteriorated filter capacitor 31 or the filter 3 including the filter capacitor 31.
- the determination result by the determination unit 13 is sent to the control unit 9, and when the determination unit 13 determines that the filter capacitor 31 has deteriorated, the control unit 9 controls, for example, the power conversion of the PWM converter 2 to be stopped.
- protective operation may be performed in motor drive device 1000 .
- the protective operation includes retraction control, braking control, drop prevention control, and the like.
- Retraction control is a control in which the workpiece and tool are synchronized and numerically controlled in a machine tool, and in the event of a power failure on the AC side, the workpiece and tool are retracted to a position where they do not interfere with each other while maintaining synchronization.
- Braking control is a control that decelerates and stops the feed shaft so that collision does not occur due to coasting of the feed shaft in a machine tool where the inertia distance of the feed shaft during a power failure on the AC side is a problem.
- Drop prevention control is a control that maintains the current position of a machine tool equipped with a gravity axis so that the gravity axis does not fall and damage the workpiece or tool during a power failure.
- the filter 3 is provided on each of the three-phase power lines between the AC power supply 4 and the PWM converter 2 composed of a three-phase full-bridge circuit. detects deterioration of filter capacitors 31 for each of these three filters 3 individually. Therefore, three sets of the current measurement unit 11, the calculation unit 12, the determination unit 13, and the alarm output unit 15 are provided corresponding to the three filters 3, respectively.
- the capacitor deterioration detection device 1 detects deterioration of the filtering capacitors 31 for each of these sets.
- the filter 3 When the AC power supply 4 is a single-phase AC power supply, the filter 3 is placed on the single-phase power line that electrically connects the AC power supply 4 and the PWM converter 2 configured by a single-phase full-bridge circuit. Therefore, the capacitor deterioration detection device 1 has only one set consisting of the current measurement unit 11, the calculation unit 12, the determination unit 13, and the alarm output unit 15, and detects deterioration of the filter capacitor 31.
- An arithmetic processing unit (processor) is provided in the capacitor deterioration detection device 1 .
- Arithmetic processing devices include, for example, ICs, LSIs, CPUs, MPUs, and DSPs.
- This arithmetic processing device has a current measurement section 11 , a calculation section 12 , a determination section 13 , a voltage measurement section 14 and an alarm output section 15 .
- Each of these units of the arithmetic processing unit is, for example, a functional module realized by a computer program executed on the processor.
- the current measurement unit 11, the calculation unit 12, the determination unit 13, the voltage measurement unit 14, and the alarm output unit 15 are constructed in a computer program format, by operating the arithmetic processing unit according to this computer program, each unit function can be realized.
- a computer program for executing each process of the current measurement unit 11, the calculation unit 12, the determination unit 13, the voltage measurement unit 14, and the alarm output unit 15 can be stored in a computer-readable medium such as a semiconductor memory, a magnetic recording medium, or an optical recording medium. may be provided in a form recorded on a suitable recording medium.
- the current measurement unit 11, the calculation unit 12, the determination unit 13, the voltage measurement unit 14, and the alarm output unit 15 may be implemented as a semiconductor integrated circuit in which a computer program that implements the functions of each unit is written.
- the calculation unit 12 calculates the capacitance of the filter capacitor 31 as the deterioration determination parameter, and the determination unit 13 compares the capacitance of the filter capacitor 31 with a predetermined reference value. Deterioration of the filter capacitor 31 is determined based on the above.
- I is the measured value of the current flowing through the filter capacitor 31 during the inspection period defined from the start of the preliminary charge to the start of the initial boost
- V is the power supply voltage on the AC side of the PWM converter 2
- f the capacitance C of the filter capacitor is expressed as in Equation 1.
- a measured value I of the current flowing through the filter capacitor 31 during the inspection period is measured by the current measurement unit 11 .
- the magnitude V of the power supply voltage and the frequency f of the power supply voltage for example, values measured by the voltage measurement unit 14 are used.
- the current measurement value I obtained by the current measurement unit 11 and the power supply voltage magnitude V and the power supply voltage frequency measurement values obtained by the voltage measurement unit 14 are measured at the same timing. It is preferable to use effective values for both the measured value I of the current flowing through the filtering capacitor 31 and the magnitude V of the power supply voltage.
- FIG. 2 is a diagram illustrating a case where a voltage measurement unit is omitted in a capacitor deterioration detection device and a converter system including the same according to an embodiment of the present disclosure.
- the voltage measurement unit 14 may be omitted from the capacitor deterioration detection device 1 as shown in FIG.
- the calculation unit 12 uses the measured value I of the current flowing through the filter capacitor 31 during the inspection period defined from the start of preliminary charging to the start of initial boosting according to Equation 1 to determine the filter current as a parameter for determining deterioration. Calculate the capacitance C of the capacitor 31 .
- the capacitance C of the filter capacitor 31 calculated by the calculation unit 12 is sent to the determination unit 13 .
- the determination unit 13 determines whether or not the filter capacitor 31 has deteriorated based on the comparison result between the capacitance of the filter capacitor 31 calculated by the calculation unit 12 and the reference value.
- FIG. 3 is a flowchart showing deterioration determination processing using the capacitance of a filter capacitor in a capacitor deterioration detection device and a converter system including the same according to an embodiment of the present disclosure.
- the inspection period is set to the period from the completion of preliminary charging of the DC link capacitor 7 to the start of initial boosting.
- step S101 the PWM converter 2 is powered on.
- step S102 the preliminary charging circuit 8 opens the preliminary charging switch 42, thereby starting preliminary charging of the DC link capacitor 7.
- the switching elements of the PWM converter 2 are not switching (that is, the switching elements are always off), and the PWM converter 2 outputs DC current to the DC side by diode rectification.
- a DC current output from the PWM converter 2 flows into the DC link capacitor 7 through the charging resistor 41, thereby precharging the DC link capacitor 7.
- FIG. During the preliminary charging period the DC current output from the PWM converter 2 passes through the charging resistor 41, so generation of rush current can be prevented.
- step S103 the control unit (not shown) that controls the preliminary charging circuit 8 determines whether or not the preliminary charging is completed. For example, a control unit that controls the pre-charging circuit 8 monitors the voltage value of the DC link capacitor 7, and determines whether pre-charging is completed based on whether the DC link capacitor 7 has been charged to a predetermined pre-charging voltage. determine whether or not When the DC link capacitor 7 is charged up to a predetermined pre-charging voltage, the controller controlling the pre-charging circuit 8 switches the pre-charging switch 42 from the open state to the closed state. Detecting device 1 is notified. After that, the process proceeds to step S104.
- step S104 the current measurement unit 11 measures the current flowing through the filter capacitor 31.
- the voltage measurement unit 14 measures the magnitude V of the supply voltage and the frequency f of the supply voltage.
- step S105 the calculation unit 12 uses the measured value I of the current flowing through the filter capacitor 31, the magnitude V of the power supply voltage, and the frequency f of the power supply voltage to determine the value of the filter capacitor 31 as a deterioration determination parameter. Calculate the capacitance C of The value of the capacitance C of the filtering capacitor 31 calculated by the calculation unit 12 is sent to the determination unit 13 .
- step S106 the determination unit 13 determines whether or not the filter capacitor 31 has deteriorated based on the comparison result between the capacitance C of the filter capacitor 31 calculated by the calculation unit 12 and the reference value.
- the reference value used in the determination process by the determination unit 13 in step S106 is, for example, an arbitrary capacitance set by the operator, the minimum capacitance required for the operation of the filter 3, or the value at which the filter capacitor 31 is damaged. The last capacitance, the capacitance outside the capacitance tolerance range specified by the manufacturer of the filter capacitor 31, or the lower limit value of the safely usable capacitance recommended by the manufacturer of the filter capacitor 31. and so on.
- the reference value may be stored in a rewritable storage unit (not shown) and rewritable by an external device. value can be changed.
- the storage unit may be composed of an electrically erasable/recordable non-volatile memory such as EEPROM (registered trademark), or a random access memory such as DRAM or SRAM that can be read and written at high speed. .
- step S106 If it is determined in step S106 that the capacitance C of the filter capacitor 31 has fallen below the reference value, the filter capacitor 31 has deteriorated, so the process proceeds to step S108, and the capacitance C of the filter capacitor 31 is used as the reference value. If it is not determined that the value is below the value, the process proceeds to step S107. A determination result by the determination unit 13 is sent to the alarm output unit 15 and the control unit 9 .
- step S108 the alarm output unit 15 outputs an alarm. Further, in step S ⁇ b>108 , control unit 9 may perform control to stop power conversion of PWM converter 2 , or may perform protection operation in motor drive device 1000 .
- step S107 the control unit 9 performs switching operation of the switching element in the PWM converter 2, and both ends of the DC link capacitor 7 is boosted to a voltage higher than the crest value of the AC voltage on the AC power supply 4 side (initial boost).
- the PWM converter 2 shifts to the normal operation mode.
- the PWM converter 2 performs power conversion between AC power on the AC side and DC power on the DC side by PWM-controlling the switching operation of the switching element based on the PWM control signal received from the control unit 9. It operates as a rectifier capable of power regeneration.
- the static electricity of the filter capacitor 31 is measured using the measured value of the current flowing through the filter capacitor 31 measured by the current measuring unit 11 between the completion of the preliminary charging in step S103 and the start of the initial boosting in step S107.
- the capacitance C is calculated, and the presence or absence of deterioration of the filter capacitor 31 is determined based on the result of comparison between the capacitance C of the filter capacitor 31 and a reference value.
- the switching operation of the switching element of the PWM converter 2 is not performed. Since it does not occur, the capacitance of the filter capacitor 31 can be obtained accurately, and the presence or absence of deterioration of the filter capacitor 31 can be determined accurately.
- deterioration of the filter capacitor 31 is automatically determined when the PWM converter 2 is started. It is not necessary to measure the capacitance of the filter capacitor 31 by using a tester and determine whether or not there is deterioration. Thus, according to the embodiment of the present disclosure, deterioration of the filter capacitor 31 can be easily detected.
- the presence or absence of deterioration of the filter capacitor 31 is determined based on the comparison between the capacitance of the filter capacitor 31 and the reference value.
- FIG. 4 is a flowchart showing a modified example of deterioration determination processing using the capacitance of the filter capacitor in the capacitor deterioration detection device and the converter system including the same according to the embodiment of the present disclosure.
- the inspection period is set to the period from the completion of preliminary charging of the DC link capacitor 7 to the start of initial boosting.
- Steps S101 to S105 in FIG. 4 are the same as steps S101 to S105 described in FIG.
- step S109 the determination unit 13 divides the capacitance of the filter capacitor 31 calculated by the calculation unit 12 by the initial value of the capacitance of the filter capacitor 31 (that is, the calculation unit Degradation of the filter capacitor 31 is determined based on the result of comparison between the ratio of the capacitance of the filter capacitor 31 calculated in step 12 to the initial value of the capacitance and the reference value.
- the initial value of the capacitance of the filter capacitor 31 used in the determination process by the determination unit 13 in step S109 is, for example, the capacitance measured when the filter capacitor 31 was shipped or manufactured, or the capacitance measured when the PWM converter 2 was shipped or manufactured.
- the reference values used in the determination process by the determination unit 13 in step S109 are the minimum capacitance required for the operation of the filter 3, the capacitance immediately before the filter capacitor 31 is damaged, and the manufacturer of the filter capacitor 31. Considering the capacitance that deviates from the specified capacitance tolerance range, or the lower limit value of the capacitance that can be used safely recommended by the manufacturer of the filter capacitor 31, the capacitance of the filter capacitor 31 It is set to a value that is, for example, several percent to ten and several percent lower than the ratio to the initial capacity value. Numerical examples shown here are merely examples, and other values may be used. Note that the reference value may be stored in a rewritable storage unit (not shown) and rewritable by an external device. value can be changed.
- step S109 If it is determined in step S109 that the value obtained by dividing the capacitance C of the filter capacitor 31 by the initial value of the capacitance of the filter capacitor is lower than the reference value, the filter capacitor 31 is degraded. Therefore, the process proceeds to step S108. If it is determined in step S109 that the value obtained by dividing the capacitance C of the filter capacitor 31 by the initial value of the capacitance of the filter capacitor is not below the reference value, the process proceeds to step S107. A determination result by the determination unit 13 is sent to the alarm output unit 15 and the control unit 9 .
- Steps S107 and S108 in FIG. 4 are the same as steps S107 and S108 described in FIG.
- the calculation unit 12 calculates the dielectric loss tangent of the filter capacitor 31 as a parameter for determining deterioration
- the determination unit 13 calculates the dielectric loss tangent of the filter capacitor 31 based on the comparison result between the dielectric loss tangent of the filter capacitor 31 and a predetermined reference value. Determining whether the filter capacitor 31 has deteriorated
- FIG. 5 is a diagram explaining the dielectric loss tangent of a capacitor.
- the filter capacitor 31 made of a film capacitor or the like can be represented by a capacitance C, an equivalent series resistance ESR, and an equivalent series inductance ESL.
- dielectric loss and resistance loss due to resistance components of electrodes and conductors occur.
- the phase difference between the voltage applied to the filtering capacitor 31 and the flowing current is 90 degrees.
- This delay angle (loss angle) is called a dielectric loss tangent or tan delta (tangent delta).
- the dielectric loss tangent tan ⁇ increases.
- the calculation unit 12 uses the current measurement value I measured by the current measurement unit 11 and the voltage measurement value V measured by the voltage measurement unit 14 to calculate the dielectric loss tangent of the filter capacitor 31 as a parameter for determining deterioration. Calculate tan ⁇ .
- the dielectric loss tangent tan ⁇ of the filtering capacitor 31 calculated by the calculation unit 12 is sent to the determination unit 13 .
- the determination unit 13 determines whether or not the filter capacitor 31 has deteriorated based on the comparison result between the dielectric loss tangent tan ⁇ of the filter capacitor 31 calculated by the calculation unit 12 and a reference value.
- FIG. 6 is a flowchart showing deterioration determination processing using the dielectric loss tangent of the filter capacitor in the capacitor deterioration detection device and the converter system including the same according to an embodiment of the present disclosure.
- the inspection period is set to the period from the completion of preliminary charging of the DC link capacitor 7 to the start of initial boosting.
- Steps S101 to S104 in FIG. 6 are the same as steps S101 to S104 described in FIG.
- step S110 the calculation unit 12 uses the measured value I of the current flowing through the filter capacitor 31, the magnitude V of the power supply voltage, and the frequency f of the power supply voltage to determine the value of the filter capacitor 31 as a deterioration determination parameter. Calculate the dielectric loss tangent tan ⁇ of The value of the dielectric loss tangent tan ⁇ of the filter capacitor 31 calculated by the calculation unit 12 is sent to the determination unit 13 .
- step S111 the determination unit 13 determines whether or not the filter capacitor 31 has deteriorated based on the comparison result between the dielectric loss tangent tan ⁇ of the filter capacitor 31 calculated by the calculation unit 12 and the reference value.
- the reference value used in the determination process by the determination unit 13 in step S111 is, for example, an arbitrary dielectric loss tangent set by the operator, the minimum dielectric loss tangent required for the operation of the filter 3, and the value immediately before the filter capacitor 31 is damaged.
- a dielectric loss tangent a dielectric loss tangent that deviates from the tolerance range of capacitance specified by the manufacturer of the filter capacitor 31, or an upper limit value of the dielectric loss tangent recommended by the manufacturer of the filter capacitor 31 that can be used safely.
- the reference value may be stored in a rewritable storage unit (not shown) and rewritable by an external device. value can be changed.
- step S111 If it is determined in step S111 that the dielectric loss tangent tan ⁇ of the filter capacitor 31 exceeds the reference value, the filter capacitor 31 is degraded, so the process proceeds to step S108, where the dielectric loss tangent tan ⁇ C of the filter capacitor 31 exceeds the reference value. If it is not determined that the value exceeds the value, the process proceeds to step S107. A determination result by the determination unit 13 is sent to the alarm output unit 15 and the control unit 9 .
- Steps S107 and S108 in FIG. 6 are the same as steps S107 and S108 described in FIG.
- the operator temporarily cuts off the power supply on the AC input side of the filter as in the past, and then uses a tester to measure the capacitance of the filter capacitor 31 himself. There is no need to measure to determine the presence or absence of deterioration.
- deterioration of the filter capacitor 31 can be automatically detected when the PWM converter 2 is started. During the inspection period from the completion of preliminary charging to the start of initial boosting, the switching operation of the switching element of the PWM converter 2 is not performed. Based on the current flowing through the capacitor 31, the capacitance of the filter capacitor 31 can be accurately obtained, and thus the presence or absence of deterioration of the filter capacitor 31 can be accurately determined.
- the embodiment of the present disclosure can also be applied when the converter is a diode rectifier to which a filter having a capacitor is connected on the AC side. in this case.
- the determination unit 13 in the capacitor deterioration device 1 determines that the filter capacitor 31 has deteriorated, by opening a switching device such as an electromagnetic contactor provided on the AC side of the diode rectifier, for example, the diode rectifier
- the power conversion of the diode rectifier is stopped by interrupting the supply of AC power to the diode rectifier.
- Capacitor Deterioration Detection Device 1 Capacitor Deterioration Detection Device 2 PWM Converter 3 Filter 4 AC Power Supply 5 Inverter 6 Motor 7 DC Link Capacitor 8 Pre-charge Circuit 9 Control Part 11 Current Measurement Part 12 Calculation Part 13 Judgment Part 14 Voltage Measurement Part 15 Alarm Output Part 31 Filter Capacitor 32 reactor 33 resistor 41 charging resistor 42 switch for preliminary charging 100 converter system 1000 motor driving device
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Inverter Devices (AREA)
- Rectifiers (AREA)
Abstract
Description
2 PWMコンバータ
3 フィルタ
4 交流電源
5 インバータ
6 モータ
7 DCリンクコンデンサ
8 予備充電回路
9 制御部
11 電流測定部
12 計算部
13 判定部
14 電圧測定部
15 アラーム出力部
31 フィルタ用コンデンサ
32 リアクトル
33 抵抗
41 充電抵抗
42 予備充電用スイッチ
100 コンバータシステム
1000 モータ駆動装置
Claims (11)
- コンバータの交流側に接続されたフィルタ内に設けられたフィルタ用コンデンサの劣化を検出するコンデンサ劣化検出装置であって、
前記フィルタ用コンデンサに流れる電流を測定する電流測定部と、
前記電流測定部により測定された前記電流の測定値を用いて、劣化判定用パラメータを算出する計算部と、
前記計算部により算出された前記劣化判定用パラメータと基準値との比較結果に基づき前記フィルタ用コンデンサの劣化の有無を判定する判定部と、
を備える、コンデンサ劣化検出装置。 - 前記コンバータは、PWMコンバータであり、
前記計算部は、前記PWMコンバータの直流側に接続されたDCリンクコンデンサの電圧を昇圧するための前記PWMコンバータ内のスイッチング素子のスイッチング動作の開始時点までの検査期間中に前記電流測定部により測定された前記電流の測定値を用いて、前記劣化判定用パラメータを算出する、請求項1に記載のコンデンサ劣化検出装置。 - 前記検査期間は、前記DCリンクコンデンサの予備充電完了時点から前記DCリンクコンデンサの電圧をさらに昇圧するための前記PWMコンバータ内のスイッチング素子のスイッチング動作の開始時点までの期間である、請求項2に記載のコンデンサ劣化検出装置。
- 前記判定部は、前記計算部により算出された前記フィルタ用コンデンサの静電容量が前記基準値を下回った場合、前記フィルタ用コンデンサが劣化したと判定する、請求項4に記載のコンデンサ劣化検出装置。
- 前記判定部は、前記計算部により算出された前記フィルタ用コンデンサの静電容量を前記フィルタ用コンデンサの静電容量初期値で除算して得られる値が、前記基準値を下回った場合、前記フィルタ用コンデンサが劣化したと判定する、請求項4に記載のコンデンサ劣化検出装置。
- 前記コンバータの交流側の電源電圧を測定する電圧測定部をさらに備え、
前記計算部は、前記検査期間中に前記電流測定部により測定された前記電流の測定値と前記電圧測定部により測定された前記電源電圧の測定値と用いて、前記劣化判定用パラメータとしての誘電正接を計算する、請求項1~3のいずれか一項に記載のコンデンサ劣化検出装置。 - 前記判定部は、前記計算部により算出された前記誘電正接が前記基準値を上回った場合、前記フィルタ用コンデンサが劣化したと判定する、請求項7に記載のコンデンサ劣化検出装置。
- 前記判定部により前記フィルタ用コンデンサが劣化したと判定された場合、アラームを出力するアラーム出力部を備える、請求項1~8のいずれか一項に記載のコンデンサ劣化検出装置。
- 交流側の交流電力と直流側の直流電力との間で電力変換を行うコンバータと、
前記コンバータの交流側に接続されたフィルタ内に設けられたフィルタ用コンデンサの劣化を検出する、請求項1~9のいずれか一項に記載のコンデンサ劣化検出装置と、
を備える、コンバータシステム。 - 前記判定部により前記フィルタ用コンデンサが劣化したと判定された場合、前記コンバータの電力変換を停止する、請求項10に記載のコンバータシステム。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18/289,023 US20240223070A1 (en) | 2021-05-11 | 2021-05-11 | Capacitor deterioration detection device and converter system |
CN202180097739.7A CN117256094A (zh) | 2021-05-11 | 2021-05-11 | 电容器劣化检测装置和转换器*** |
DE112021007221.8T DE112021007221T5 (de) | 2021-05-11 | 2021-05-11 | Kondensatorverschlechterungsdetektionsvorrichtung und wandlersystem |
JP2023520636A JPWO2022239122A1 (ja) | 2021-05-11 | 2021-05-11 | |
PCT/JP2021/017920 WO2022239122A1 (ja) | 2021-05-11 | 2021-05-11 | コンデンサ劣化検出装置及びコンバータシステム |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2021/017920 WO2022239122A1 (ja) | 2021-05-11 | 2021-05-11 | コンデンサ劣化検出装置及びコンバータシステム |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022239122A1 true WO2022239122A1 (ja) | 2022-11-17 |
Family
ID=84028942
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2021/017920 WO2022239122A1 (ja) | 2021-05-11 | 2021-05-11 | コンデンサ劣化検出装置及びコンバータシステム |
Country Status (5)
Country | Link |
---|---|
US (1) | US20240223070A1 (ja) |
JP (1) | JPWO2022239122A1 (ja) |
CN (1) | CN117256094A (ja) |
DE (1) | DE112021007221T5 (ja) |
WO (1) | WO2022239122A1 (ja) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150241503A1 (en) * | 2014-02-24 | 2015-08-27 | Rockwell Automation Technologies, Inc. | Filter capacitor degradation identification using computed current |
JP2019158456A (ja) * | 2018-03-09 | 2019-09-19 | 東芝シュネデール・インバータ株式会社 | 正弦波フィルタのコンデンサ容量判定装置 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3794740B2 (ja) | 1995-11-17 | 2006-07-12 | 埼玉機器株式会社 | 全油圧パワーブレーキ装置用ブレーキバルブ |
JPH1014097A (ja) | 1996-06-18 | 1998-01-16 | Hitachi Ltd | 電力変換器のコンデンサ容量判定装置 |
WO2018042809A1 (ja) | 2016-08-29 | 2018-03-08 | 三菱電機株式会社 | 静電容量検出装置及び電力変換装置 |
JP6629893B2 (ja) | 2018-02-05 | 2020-01-15 | ファナック株式会社 | 浮遊容量を推定するモータ駆動装置 |
US11342880B2 (en) | 2018-06-13 | 2022-05-24 | Mitsubishi Electric Corporation | Capacitor capacitance estimation device, control system, and capacitor capacitance estimation method |
-
2021
- 2021-05-11 CN CN202180097739.7A patent/CN117256094A/zh active Pending
- 2021-05-11 DE DE112021007221.8T patent/DE112021007221T5/de active Pending
- 2021-05-11 JP JP2023520636A patent/JPWO2022239122A1/ja active Pending
- 2021-05-11 US US18/289,023 patent/US20240223070A1/en active Pending
- 2021-05-11 WO PCT/JP2021/017920 patent/WO2022239122A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150241503A1 (en) * | 2014-02-24 | 2015-08-27 | Rockwell Automation Technologies, Inc. | Filter capacitor degradation identification using computed current |
JP2019158456A (ja) * | 2018-03-09 | 2019-09-19 | 東芝シュネデール・インバータ株式会社 | 正弦波フィルタのコンデンサ容量判定装置 |
Also Published As
Publication number | Publication date |
---|---|
US20240223070A1 (en) | 2024-07-04 |
CN117256094A (zh) | 2023-12-19 |
JPWO2022239122A1 (ja) | 2022-11-17 |
DE112021007221T5 (de) | 2024-01-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4788461B2 (ja) | 電源制御装置およびリレーの異常検出方法 | |
US9444373B2 (en) | Motor control device having protective unit of charging resistor | |
US9787084B2 (en) | Motor driving device | |
JP5954356B2 (ja) | 電動車両 | |
US20170099012A1 (en) | Pwm rectifier including capacitance calculation unit | |
TWI467203B (zh) | 蓄電器件的壽命診斷方法 | |
JP5997302B2 (ja) | 蓄電器を用いたモータ駆動装置 | |
JP5095530B2 (ja) | 充放電システムの異常判定方法及び異常判定装置 | |
JP6668969B2 (ja) | 電気自動車用の電源システム | |
US11400917B2 (en) | Power supply system for vehicle | |
JP5000029B1 (ja) | 交流モータ駆動装置 | |
WO2015090892A1 (en) | Method and power converter for determining cell capacitor degradation in a converter cell | |
WO2017061188A1 (ja) | 車載型充電装置 | |
CN107472028A (zh) | 用于控制车辆的充电装置的方法和*** | |
JP6629893B2 (ja) | 浮遊容量を推定するモータ駆動装置 | |
CN112909895A (zh) | 马达驱动装置 | |
JP5223367B2 (ja) | 駆動装置 | |
JPH11346476A (ja) | インバータ内部コンデンサの異常検出装置 | |
CN112693314B (zh) | 车辆的电源*** | |
WO2022239122A1 (ja) | コンデンサ劣化検出装置及びコンバータシステム | |
JP5276469B2 (ja) | 過電圧保護装置 | |
JP2013240238A (ja) | 電力変換装置 | |
WO2022219823A1 (ja) | 充電制御部を備えるモータ駆動装置 | |
JPH11160377A (ja) | 電力変換器用コンデンサの劣化検出方式 | |
JP5615427B2 (ja) | 交流モータ駆動装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 21941856 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2023520636 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 18289023 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 202180097739.7 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 112021007221 Country of ref document: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 21941856 Country of ref document: EP Kind code of ref document: A1 |