JP2016111080A - Capacitor deterioration diagnosis device, inverter device, and household electrical appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a capacitor deterioration diagnosis device, an inverter device, and a household electrical appliance, capable of achieving deterioration detection of an electrolytic capacitor by a low-cost configuration.SOLUTION: A capacitor deterioration diagnosis device comprises: a humidity sensor that detects the humidity of air around an electrolytic capacitor; and deterioration determination means that determines deterioration of the electrolytic capacitor when a detection value of the humidity sensor becomes larger than a deterioration determination level that is preliminarily set.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a capacitor deterioration diagnosis device that detects deterioration of an electrolytic capacitor, an inverter device including the capacitor deterioration diagnosis device, and home appliances.

  A conventional electrolytic capacitor deterioration diagnosis apparatus has been proposed that obtains a transmission image of an electrolytic capacitor by irradiating the electrolytic capacitor with electromagnetic waves, and calculates a deterioration index based on the transmission image (for example, a patent). Reference 1).

Japanese Patent No. 5298325

The technique described in Patent Document 1 acquires a transmission image of an electrolytic capacitor by irradiating the electrolytic capacitor with an electromagnetic wave whose transmission is hindered by the electrolytic solution. Next, the acquired transmission image is converted into a grayscale image associated with a grayscale value corresponding to the grayscale level. Then, the grayscale value frequency distribution is generated using the grayscale image, and the deterioration determination is performed by calculating the deterioration index indicating the deterioration state of the electrolytic capacitor based on the generated frequency distribution.
As described above, the technique described in Patent Document 1 has a problem in that the configuration for detecting the deterioration of the capacitor and the arithmetic processing are complicated, and the detection of the deterioration of the capacitor cannot be realized with an inexpensive configuration. there were.

  The present invention has been made in order to solve the above-described problems, and provides a capacitor deterioration diagnosis device, an inverter device, and a home appliance that can detect deterioration of an electrolytic capacitor with an inexpensive configuration. is there.

  A capacitor deterioration diagnosis device according to the present invention is a capacitor deterioration diagnosis device that detects deterioration of an electrolytic capacitor containing an electrolytic solution, and includes a humidity sensor that detects humidity of ambient air around the electrolytic capacitor, and a detection value of the humidity sensor. And a deterioration determining means for determining deterioration of the electrolytic capacitor when a predetermined deterioration determination level is exceeded.

  According to the present invention, since the deterioration of the electrolytic capacitor is determined based on the detection value of the humidity sensor that detects the humidity of the ambient air of the electrolytic capacitor, the detection of the deterioration of the capacitor can be realized with an inexpensive configuration.

1 is a block configuration diagram of a capacitor deterioration diagnosis device according to Embodiment 1. FIG. It is a side view which shows the arrangement | positioning relationship between the humidity sensor which concerns on Embodiment 1, and an aluminum electrolytic capacitor. 1 is a perspective view schematically showing an aluminum electrolytic capacitor according to Embodiment 1. FIG. It is a figure which shows typically the swelling state of the explosion-proof valve of an aluminum electrolytic capacitor. It is a figure which shows the relationship between the usage time of an aluminum electrolytic capacitor, the expansion of an explosion-proof valve, and the amount of ejection of electrolyte solution. It is a figure which shows the relationship between the humidity of the surrounding air of the aluminum electrolytic capacitor which concerns on Embodiment 1, and the output voltage of a humidity sensor. 6 is a diagram illustrating an example of a sensor board fixing method according to Embodiment 1. FIG. 6 is a diagram illustrating an example of a sensor board fixing method according to Embodiment 1. FIG. It is a figure which shows the relationship between the humidity of the surrounding air of the aluminum electrolytic capacitor which concerns on Embodiment 2, and the output voltage of a humidity sensor. FIG. 6 is a circuit diagram of an inverter device according to a third embodiment. It is a figure which shows the structure of the air conditioner which concerns on Embodiment 4. FIG.

Embodiment 1 FIG.
FIG. 1 is a block configuration diagram of the capacitor deterioration diagnosis apparatus according to the first embodiment.
In FIG. 1, the capacitor deterioration diagnosis apparatus 100 includes a humidity sensor 10, a deterioration determination unit 11, a notification unit 12, and a stop unit 13. This capacitor deterioration diagnostic device 100 detects deterioration of an aluminum electrolytic capacitor 200 (described later) containing an electrolytic solution.

The humidity sensor 10 detects the humidity (relative humidity) of the ambient air around the aluminum electrolytic capacitor 200 and outputs a voltage corresponding to the detected value to the degradation determination means 11.
The deterioration determination unit 11 determines the deterioration of the aluminum electrolytic capacitor 200 based on the voltage output from the humidity sensor 10. Details will be described later.
The notification means 12 is composed of, for example, a segment LED or a liquid crystal display element, and notifies the user of predetermined information regarding the deterioration state of the aluminum electrolytic capacitor 200 based on the output of the deterioration determination means 11.
The stopping unit 13 outputs a predetermined signal corresponding to the deterioration state, such as a stop signal for a device on which the aluminum electrolytic capacitor 200 is mounted, based on the output of the deterioration determining unit 11.
Note that one of the notification unit 12 and the stop unit 13 may be omitted.

FIG. 2 is a side view showing the positional relationship between the humidity sensor and the aluminum electrolytic capacitor according to the first embodiment.
In FIG. 2, the aluminum electrolytic capacitor 200 is provided with an explosion-proof valve 22 that opens when the internal pressure of the case rises due to the evaporation of the electrolyte.
The humidity sensor 10 is disposed to face the explosion-proof valve 22 of the aluminum electrolytic capacitor 200. The humidity sensor 10 is mounted on the sensor substrate 110, for example. The sensor substrate 110 is fixed to the capacitor mounting substrate 210 on which the aluminum electrolytic capacitor 200 is mounted, so that the humidity sensor 10 is disposed to face the explosion-proof valve 22 of the aluminum electrolytic capacitor 200.
The sensor substrate 110 corresponds to a “first substrate” in the present invention, and the capacitor mounting substrate 210 corresponds to a “second substrate” in the present invention. The aluminum electrolytic capacitor 200 corresponds to the “electrolytic capacitor” in the present invention.

The capacitor mounting substrate 210 and the sensor substrate 110 are housed in a product housing 120 of a device on which the aluminum electrolytic capacitor 200 is mounted.
Thus, the aluminum electrolytic capacitor 200 and the humidity sensor 10 are disposed in the same atmosphere, and the humidity sensor 10 detects the humidity RHa of the ambient air around the aluminum electrolytic capacitor 200.

FIG. 3 is a perspective view schematically showing the aluminum electrolytic capacitor according to the first embodiment.
As shown in FIG. 3, the aluminum electrolytic capacitor 200 accommodates an electrolytic capacitor element in which electric charges are accumulated, and the outer peripheral portion and the side surface of the upper surface 20 a of the case 20 made of metal such as aluminum are covered with a thin resin 21. .
Further, an X-shaped groove 20b is formed on the upper surface 20a of the case 20, and the explosion-proof valve 22 is constituted by the upper surface 20a and the groove 20b.
The explosion-proof valve 22 expands when gas is generated due to decomposition of the electrolytic solution inside the case 20 and the pressure inside the case 20 rises, and the groove 20b breaks (opens) before the explosion of the case 20 occurs. Gas escapes. In the example of FIG. 3, the X-shaped groove is formed on the upper surface 20a. However, the shape is not limited to this, and any shape can be used.
The aluminum electrolytic capacitor 200 is used by being attached to a capacitor mounting substrate 210 together with other electronic components.

  Note that the capacitor for which the capacitor deterioration diagnosis device 100 detects deterioration is not limited to an aluminum electrolytic capacitor, but may be a capacitor containing an electrolytic solution. For example, any type of non-solid electrolytic capacitor can be detected.

Next, the operation of the capacitor deterioration diagnosis apparatus 100 according to the first embodiment will be described.
FIG. 4 is a diagram schematically showing the swollen state of the explosion-proof valve of the aluminum electrolytic capacitor.
FIG. 5 is a diagram showing the relationship between the usage time of the aluminum electrolytic capacitor, the expansion of the explosion-proof valve, and the amount of ejection of the electrolytic solution. Fig.5 (a) shows the expansion of an explosion-proof valve, FIG.5 (b) shows the ejection amount of electrolyte solution.
In FIG. 4, the electrolyte vapor ejected from the explosion-proof valve 22 of the humidity sensor 10 is schematically indicated by arrows.
As shown in FIG. 4 and FIG. 5A, in the aluminum electrolytic capacitor 200, the evaporation of the electrolytic solution proceeds with the lapse of usage time, the internal pressure gradually increases, and the explosion-proof valve 22 gradually expands. When the explosion-proof valve 22 further expands and the stress on the groove 20b exceeds the limit, the valve is opened (operated).
As shown in FIG. 5B, when the explosion-proof valve 22 operates, the electrolyte evaporated inside the aluminum electrolytic capacitor 200 is ejected from the explosion-proof valve 22. When the electrolyte vapor 23 is ejected from the explosion-proof valve 22, the humidity of the air surrounding the aluminum electrolytic capacitor 200 increases.
Thus, by detecting the humidity of the air around the aluminum electrolytic capacitor 200, it is possible to detect the ejection of the vapor 23 of the electrolytic solution. That is, the deterioration of the aluminum electrolytic capacitor 200 can be determined as a result by detecting the ejection of the electrolytic solution caused by the deterioration in the aluminum electrolytic capacitor 200.

FIG. 6 is a diagram showing the relationship between the humidity of the ambient air of the aluminum electrolytic capacitor according to Embodiment 1 and the output voltage of the humidity sensor.
As shown in FIG. 6, the humidity of the ambient air around the aluminum electrolytic capacitor 200 and the output voltage of the humidity sensor 10 are in a proportional relationship. That is, when the electrolyte vapor 23 is ejected by the operation of the explosion-proof valve 22, the humidity of the air surrounding the aluminum electrolytic capacitor 200 increases and the output voltage value of the humidity sensor 10 increases.

  Therefore, in the first embodiment, as shown in FIG. 6, the deterioration determination level is set in advance in the deterioration determination means 11. And the deterioration determination means 11 determines deterioration of the aluminum electrolytic capacitor 200, when the output voltage of the humidity sensor 10 exceeds this deterioration determination level (b point of FIG. 6). That is, when the humidity of the ambient air around the aluminum electrolytic capacitor 200 is low (in the case of the point a or less in FIG. 6), the deterioration determining means 11 determines that the aluminum electrolytic capacitor 200 is normal, but when the humidity is high (FIG. 6). In the case of exceeding the point a), the deterioration determining means 11 determines that the aluminum electrolytic capacitor 200 has deteriorated.

  The change in the humidity of the ambient air around the aluminum electrolytic capacitor 200 varies depending on the type of the aluminum electrolytic capacitor 200 and the shape of the explosion-proof valve 22, and also varies depending on the positional relationship between the humidity sensor 10 and the aluminum electrolytic capacitor 200. The determination level is preferably set by an experimental value obtained by measuring an actual temperature change amount at the time of deterioration.

  In the first embodiment, the deterioration is determined when the detection voltage of the humidity sensor 10 exceeds the deterioration determination level. However, the present invention is not limited to this, and the amount of change in the detection voltage of the humidity sensor 10 is determined. Based on this, deterioration may be determined. For example, it may be determined that the detection voltage has deteriorated when the amount of change in the detection voltage per time exceeds a preset threshold. With such a configuration, it is possible to suppress erroneous detection due to a long-term humidity change, such as an increase in humidity in the installation environment of the device on which the aluminum electrolytic capacitor 200 is mounted, and to improve the determination accuracy of deterioration.

The deterioration determination unit 11 outputs a determination result of the deterioration state to the notification unit 12. The notification unit 12 displays information (for example, an error code) regarding the determined deterioration state on, for example, a segment LED or a liquid crystal display element. In this display, information on predetermined maintenance content (for example, a message for prompting parts replacement) may be displayed. In addition, information regarding the deterioration state may be notified by sound using a speaker or the like.
Further, the deterioration determination unit 11 outputs the determination result of the deterioration state to the stop unit 13. For example, the stopping unit 13 outputs a stop signal to a device on which the aluminum electrolytic capacitor 200 is mounted, and stops the operation of the device. The output from the stopping means 13 is not limited to this, and an arbitrary operation signal may be output, for example, a signal instructing a decrease in the output power of the device.

As described above, the first embodiment includes the humidity sensor 10 that detects the humidity of the ambient air around the aluminum electrolytic capacitor 200, and determines the deterioration of the aluminum electrolytic capacitor 200 based on the detection value of the humidity sensor 10.
For this reason, it is possible to determine the deterioration of the aluminum electrolytic capacitor 200 with a simple configuration, and to reduce the product cost.
Further, since the deterioration of the aluminum electrolytic capacitor 200 is determined when the detection value of the humidity sensor 10 exceeds a preset deterioration determination level, the detection of the deterioration of the aluminum electrolytic capacitor 200 can be realized with high accuracy.

  Further, the humidity sensor 10 is disposed to face the explosion-proof valve 22 of the aluminum electrolytic capacitor 200. For this reason, it becomes possible to efficiently detect an increase in humidity due to the vapor 23 of the electrolytic solution ejected from the explosion-proof valve 22, and the deterioration of the aluminum electrolytic capacitor 200 can be accurately detected.

  Further, by notifying the determination result of the deterioration state of the aluminum electrolytic capacitor 200 by the notification means 12, information regarding the deterioration state of the aluminum electrolytic capacitor 200 can be notified to the user. Thereby, the user can suppress the driving | running in the state in which the aluminum electrolytic capacitor 200 has deteriorated by stopping the driving | operation of the apparatus in which the aluminum electrolytic capacitor 200 is mounted, for example.

  Further, according to the determination result of the deterioration state of the aluminum electrolytic capacitor 200, the stopping unit 13 outputs a stop signal to, for example, a device on which the aluminum electrolytic capacitor 200 is mounted, and stops the operation of the device. Thereby, when the aluminum electrolytic capacitor 200 is in a deteriorated state, the operation of the device on which the aluminum electrolytic capacitor 200 is mounted can be stopped.

  Further, the humidity sensor 10 is mounted on the sensor substrate 110, and the sensor substrate 110 is fixed to the capacitor mounting substrate 210. For this reason, the positional relationship between the humidity sensor 10 and the aluminum electrolytic capacitor 200 is fixed, and detection of deterioration of the aluminum electrolytic capacitor 200 can be realized with high accuracy. Further, it is possible to make the aluminum electrolytic capacitor 200 and other electronic components less susceptible to heat generation, and it is possible to detect deterioration of the aluminum electrolytic capacitor 200 with high accuracy and high reliability.

As a method for fixing the sensor substrate 110 to the capacitor mounting substrate 210, for example, there are methods as shown in FIGS.
For example, as shown in FIG. 7, for example, a spacer 111 is disposed between the sensor substrate 110 and the capacitor mounting substrate 210, and each substrate and the spacer 111 are fixed with screws 112, so that the sensor mounting substrate 210 is attached to the capacitor mounting substrate 210. 110 is fixed.
For example, as shown in FIG. 8, the sensor substrate 110 is fixed to the product housing 120 on which the aluminum electrolytic capacitor 200 is mounted with screws 121.
The method for fixing the sensor substrate 110 is not limited to this, and any method may be used as long as the humidity sensor 10 can be disposed facing the explosion-proof valve 22.

Embodiment 2. FIG.
The deterioration determination means 11 in the second embodiment has a plurality of deterioration determination levels set in advance, and determines the degree of deterioration of the aluminum electrolytic capacitor 200 in multiple stages.
Hereinafter, the second embodiment will be described focusing on the differences from the first embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

FIG. 9 is a diagram showing the relationship between the humidity of the ambient air of the aluminum electrolytic capacitor according to the second embodiment and the output voltage of the humidity sensor.
A plurality of deterioration determination levels are set in advance in the deterioration determination means 11 in the second embodiment. For example, as shown in FIG. 9, deterioration determination levels 1 to 3 (b1 to b3) are set corresponding to the humidity points a1 to a3.
The deterioration determination means 11 compares the output voltage of the humidity sensor 10 with the deterioration determination levels 1 to 3, and determines the degree of deterioration according to each deterioration determination level.
Since the change in the humidity of the ambient air around the aluminum electrolytic capacitor 200 varies depending on the aluminum electrolytic capacitor 200, it is preferable to set a plurality of deterioration determination levels based on experimental values obtained by measuring the actual humidity change amount.

For example, the deterioration determination means 11 determines that the output voltage of the humidity sensor is in a normal state until b3.
On the other hand, when the output voltage of the humidity sensor exceeds b3, it is in a deteriorated state, and a predetermined degree of deterioration is determined according to the deterioration determination levels 1 to 3. The deterioration determination unit 11 outputs a determination result of the deterioration state to the notification unit 12.
For example, when the deterioration determination level 1 is exceeded, it is determined that the degree of deterioration is a caution state. When the deterioration determination level 2 is exceeded, it is determined that the degree of deterioration is a warning state. Moreover, when the deterioration determination level 3 is exceeded, it determines with the grade of deterioration being a interruption | blocking state.
And the alerting | reporting means 12 displays the information (for example, attention, warning, interruption | blocking etc.) regarding the degree of degradation determined, for example by segment LED or a liquid crystal display element etc. according to the degree of degradation. In this case, information on predetermined maintenance contents may be displayed. For example, when a warning is issued, a warning is given that the parts life is near, a message prompting replacement of the parts is displayed when the warning is given, and a message indicating that the operation cannot be performed due to the parts life is displayed when the warning is interrupted.

Further, the deterioration determination unit 11 outputs a determination result of the degree of deterioration to the stop unit 13. The stopping unit 13 outputs, for example, an apparatus in which the aluminum electrolytic capacitor 200 is mounted according to the determined degree of deterioration.
For example, when the degree of deterioration is a caution state, no output is made to the device. When the degree of deterioration is a warning state, a signal instructing a decrease in the output power of the device is output. In addition, when the degree of deterioration is in the cut-off state, a stop signal is output to stop the operation of the device.
Note that the number of deterioration determination levels is not limited to three, and an arbitrary number can be set.

  As described above, in the second embodiment, the deterioration determination means 11 has a plurality of deterioration determination levels set in advance, and determines the degree of deterioration of the aluminum electrolytic capacitor 200 in multiple stages. For this reason, in addition to the effect of the first embodiment, it is possible to make a determination according to the degree of deterioration of the aluminum electrolytic capacitor 200.

Embodiment 3 FIG.
FIG. 10 is a circuit diagram of the inverter device according to the third embodiment.
In FIG. 10, an inverter device 300 includes a rectifier circuit 3, an inverter circuit 5 that converts a DC voltage into an AC voltage and outputs the output, an aluminum electrolytic capacitor 200, and a capacitor deterioration diagnosis device described in the first or second embodiment. 100 and a control means 6 for controlling the drive of the inverter circuit 5. This inverter device 300 controls the operation of the motor 7 (load) driven by the electric power supplied from the commercial power source 1.

The rectifier circuit 3 is a full-wave rectifier circuit, for example, and converts the AC voltage of the commercial power supply 1 into a DC voltage. The rectifier circuit 3 is configured by bridge-connecting rectifier diodes 3a to 3d of four semiconductor switch elements.
The above-described aluminum electrolytic capacitor 200 is connected to the output side of the rectifier circuit 3 as a smoothing capacitor.

  The inverter circuit 5 receives a DC voltage smoothed by the aluminum electrolytic capacitor 200, performs, for example, PWM control under the control of the control means 6, and converts the input DC voltage into an AC of an arbitrary voltage and an arbitrary frequency. The inverter circuit 5 is configured by bridge-connecting switching elements 5a to 5f made of a semiconductor such as a transistor, for example. Each switching element 5a to 5f is provided with a diode in parallel in the reverse current direction.

  The control means 6 performs PWM (Pulse Width Modulation) by determining the switching time of the switching elements 5 a to 5 f of the inverter circuit 5, and applies the voltage to each winding of the motor 7 to control the motor 7. Drive control.

Capacitor deterioration diagnosis apparatus 100 detects deterioration of aluminum electrolytic capacitor 200 provided on the output side of rectifier circuit 3 as in the first or second embodiment.
Further, the stopping unit 13 of the capacitor deterioration diagnosis apparatus 100 outputs a predetermined signal corresponding to the deterioration state to the control unit 6.
For example, the stopping unit 13 outputs a stop signal or a signal for instructing a decrease in the output power of the load (motor 7) to the control unit 6 based on the output of the deterioration determining unit 11.

The control means 6 controls the drive of the motor 7 by controlling the inverter circuit 5 according to the determination result of the capacitor deterioration diagnosis device 100.
For example, when a stop signal is input, the driving of the motor 7 is stopped. Further, when a signal instructing a decrease in output power is input, the output power from the inverter circuit 5 is decreased by reducing the number of revolutions of the motor 7 or the like.

  As described above, in the third embodiment, since the operation of the inverter circuit 5 is controlled according to the determination result of the deterioration determination means 11, it is possible to prevent the generation of smoke and off-flavor due to the deterioration failure of the aluminum electrolytic capacitor 200. Can do.

Embodiment 4 FIG.
In the fourth embodiment, a case where the capacitor deterioration diagnosis device 100 is mounted on, for example, an air conditioner as a home appliance will be described.
FIG. 11 is a diagram illustrating a configuration of an air conditioner according to the fourth embodiment.
In FIG. 11, the air conditioner according to the fourth embodiment includes an outdoor unit 310 and an indoor unit 320. The outdoor unit 310 is connected to a refrigerant circuit (not shown) and constitutes a refrigerant compressor 311 constituting a refrigeration cycle, not shown. A blower 312 for an outdoor unit that blows the heat exchanger is provided. At least one of the refrigerant compressor 311 and the outdoor unit blower 312 is driven by the motor 7 controlled by the inverter device 300 described above.
Even in such a configuration, it goes without saying that the same effects as those of the first to third embodiments can be obtained.

  In addition, in this Embodiment 4, although the air conditioner was demonstrated as an example of household appliances, this invention is not restricted to this, What is necessary is just household appliances provided with the load driven by the inverter apparatus 300, For example, a refrigerator, a hand dryer, an IH cooking heater, a rice cooker, a lighting device, or the like may be used.

  DESCRIPTION OF SYMBOLS 1 Commercial power supply, 3 Rectifier circuit, 3a-3d Rectifier diode, 5 Inverter circuit, 5a-5f Switching element, 6 Control means, 7 Motor, 10 Humidity sensor, 11 Degradation judgment means, 12 Notification means, 13 Stop means, 20 Case , 20a Top surface, 20b Groove, 21 Resin, 22 Explosion-proof valve, 23 Electrolyte vapor, 100 Capacitor deterioration diagnosis device, 110 Sensor substrate, 111 Spacer, 112 Screw, 120 Product housing, 121 Screw, 200 Aluminum electrolytic capacitor, 210 Capacitor mounting substrate, 300 inverter device, 310 outdoor unit, 311 refrigerant compressor, 312 blower, 320 indoor unit.

Claims (8)

A capacitor deterioration diagnosis device that detects deterioration of an electrolytic capacitor containing an electrolyte solution,
A humidity sensor for detecting the humidity of the air surrounding the electrolytic capacitor;
A deterioration determination means for determining deterioration of the electrolytic capacitor when a detection value of the humidity sensor exceeds a preset deterioration determination level;
A capacitor deterioration diagnosis apparatus comprising: The deterioration determining means includes
The capacitor deterioration diagnosis apparatus according to claim 1, wherein a plurality of deterioration determination levels are set in advance, and the degree of deterioration of the electrolytic capacitor is determined in multiple stages. The electrolytic capacitor has an explosion-proof valve,
The said humidity sensor is arrange | positioned facing the said explosion-proof valve of the said electrolytic capacitor. The capacitor | condenser degradation diagnostic apparatus of Claim 1 or 2 characterized by the above-mentioned. The humidity sensor is mounted on the first substrate,
The capacitor degradation diagnosis apparatus according to claim 3, wherein the first substrate is fixed to a second substrate on which the electrolytic capacitor is mounted. The capacitor deterioration diagnosis apparatus according to any one of claims 1 to 4, further comprising notification means for notifying information on a deterioration state determined by the deterioration determination means. An electrolytic capacitor containing an electrolyte that smoothes the rectified power supply voltage; and
An inverter circuit that has a plurality of switching elements, converts the DC voltage smoothed by the electrolytic capacitor into an AC voltage, and outputs the AC voltage;
Capacitor deterioration diagnosis device according to any one of claims 1 to 5,
An inverter device comprising: Comprising control means for controlling the drive of the inverter circuit;
The control means includes
The inverter device according to claim 6, wherein operation of the inverter circuit is controlled according to a determination result of the deterioration determination unit. An inverter device according to claim 6 or 7,
A load driven by the inverter circuit;
Home appliances characterized by comprising

Images