JP2014032132A - Capacitor deterioration diagnostic device, inverter device, and household electrical appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a capacitor deterioration diagnostic device, an inverter device, and a household electrical appliance which can detect the abnormality of a deterioration state of a capacitor with high accuracy.SOLUTION: A capacitor deterioration diagnostic device 100 which detects the abnormality of a deterioration state of an aluminum electrolytic capacitor 200 having an explosion-proof valve 22 includes: a light emitting element 10 emitting light toward the explosion-proof valve 22; a light receiving element 11 receiving reflection light from the explosion-proof valve 22; and deterioration determination means 13 for determining the abnormality of the deterioration state of the aluminum electrolytic capacitor 200 on the basis of a detection value of the light receiving element 11.

Description

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

  In the electrolytic capacitor, a capacitor element impregnated with an electrolytic solution is housed in a metal case. Such an electrolytic capacitor is provided with an explosion-proof valve for preventing an explosion because the electrolytic solution is vaporized due to aging and the like, and the internal pressure of the metal case is increased to cause an explosion. The explosion-proof valve forms a thin part in a part of the metal case, and opens and functions when the internal pressure rises. As a result, the electrolytic capacitor safely fails without exploding. However, if the electrolytic solution vaporized from the inside of the electrolytic capacitor leaks when the explosion-proof valve is activated, white smoke or a strange odor is generated, which may give the user a misunderstanding that it is due to ignition.

In the conventional technology, a power supply device has been proposed in which a temperature detection block is physically attached to the case of the electrolytic capacitor, the deterioration state is detected by detecting the temperature rise of the electrolytic capacitor, and control is performed to prevent the operation of the explosion-proof valve. (For example, refer to Patent Document 1).
In addition, an aluminum electrolytic capacitor has been proposed in which when a capacitor element generates heat, the operation of the explosion-proof valve is prevented by detecting the heat generation by the temperature-sensitive element and shutting off the electric circuit of the capacitor (see, for example, Patent Document 2). .

JP 2012-23891 A (paragraph [0041]) JP-A-4-233214 (Claim 1)

In the conventional technology, a temperature sensor is physically attached to the capacitor, and the deterioration state is judged based on the output of the temperature sensor. Therefore, there is a problem that the thermal resistance varies easily and the detection accuracy is low. It was.
In addition, it is necessary to mount a band to reduce the variation in thermal resistance, and it is necessary to secure the labor of manufacturing, the component cost for mounting the band, and the board area for mounting this, as a result There was a problem that the mounting substrate cost was high.

The present invention has been made to solve the above-described problems, and provides a capacitor deterioration diagnosis device, an inverter device, and a home appliance that can accurately detect an abnormality in the deterioration state of a capacitor.
Further, it is possible to obtain a capacitor deterioration diagnosis device, an inverter device, and a home electric appliance that can detect an abnormality of a capacitor deterioration state with an inexpensive configuration.

  A capacitor deterioration diagnosis device according to the present invention is a capacitor deterioration diagnosis device that detects an abnormality in a deterioration state of an electrolytic capacitor having an explosion-proof valve, and includes a light-emitting element that emits light toward the explosion-proof valve, and the explosion-proof valve. A light receiving element that receives the reflected light, and a deterioration determining means that determines an abnormality in the deterioration state of the electrolytic capacitor based on a detection value of the light receiving element.

  In the present invention, since the abnormality of the deterioration state of the electrolytic capacitor is determined based on the detection value of the reflected light from the explosion-proof valve, the abnormality of the deterioration state of the capacitor can be accurately detected. Further, it is possible to detect an abnormality in the deterioration state of the capacitor 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 of the light emitting element and light receiving element which concern 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 the relationship between the usage time of an aluminum electrolytic capacitor, and the expansion of an explosion-proof valve. It is a figure which shows typically the optical path in the swollen state of the explosion-proof valve which concerns on Embodiment 1. FIG. It is a figure which shows the relationship between the swelling of the explosion-proof valve which concerns on Embodiment 1, and the incident light quantity to a light receiving element. 6 is a diagram illustrating an example of a method for fixing an optical component substrate according to Embodiment 1. FIG. 6 is a diagram illustrating an example of a method for fixing an optical component substrate according to Embodiment 1. FIG. It is a figure which shows the relationship between the swelling of the explosion-proof valve which concerns on Embodiment 2, and the incident light quantity to a light receiving element. 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 diagram of the capacitor deterioration diagnosis apparatus according to the first embodiment.
FIG. 2 is a side view showing the arrangement relationship between the light emitting element and the light receiving element and the aluminum electrolytic capacitor according to the first embodiment.
1 and 2, the capacitor deterioration diagnosis device 100 includes a light emitting element 10, a light receiving element 11, an optical component control unit 12, a deterioration determination unit 13, a notification unit 14, and a stop unit 15. This capacitor deterioration diagnosis device 100 detects an abnormality in the deterioration state of the aluminum electrolytic capacitor 200 having the explosion-proof valve 22.
The light emitting element 10 and the light receiving element 11 are disposed to face the explosion-proof valve 22 of the aluminum electrolytic capacitor 200.
For example, as shown in FIG. 2, the light emitting element 10 and the light receiving element 11 are mounted on an optical component substrate 110, and the optical component substrate 110 is fixed to a capacitor mounting substrate 210 on which an aluminum electrolytic capacitor 200 is mounted. Thus, the light emitting element 10 and the light receiving element 11 are arranged to face the explosion-proof valve 22 of the aluminum electrolytic capacitor 200.
The optical component substrate 110 corresponds to the “first substrate” in the present invention, and the capacitor mounting substrate 210 corresponds to the “second substrate” in the present invention. The aluminum electrolytic capacitor 200 corresponds to the “electrolytic capacitor” in the present invention.

The light emitting element 10 emits light toward at least the explosion-proof valve 22. The light emitting element 10 is composed of, for example, an LED (light emitting diode), and emits light by changing electrical energy to light energy.
The light receiving element 11 receives at least the reflected light from the explosion-proof valve 22. The light receiving element 11 is composed of, for example, a PD (photodiode) or the like. For example, when the semiconductor PN junction is irradiated with light, a photoelectromotive force is generated and a current based on the intensity of the light flows. ing.
As described above, the light emitting element 10 is formed of an LED, and the light receiving element 11 is formed of a PD. Thus, the light emitting element 10 and the light receiving element 11 are both formed of an inexpensive material. The cost can be very low and the size can be reduced. In addition, since the wavelength of the light emitted from the light emitting element 10 and received by the light receiving element 11 is set to the wavelength in the infrared region, the light having the wavelength in the infrared region is not easily affected by ambient light, and thus the detection sensitivity is low. It can be made less affected by the surrounding environment.

  The arrangement positions of the light emitting element 10 and the light receiving element 11 are such that at least a part of the light emitted by the light emitting element 10 is explosion proof when the explosion proof valve 22 of the aluminum electrolytic capacitor 200 is not expanded (hereinafter also referred to as normal). It is arranged at a position where it is reflected by the valve 22 and enters the light receiving element 11. In FIG. 2, the light path from the light emitting element 10 toward the explosion-proof valve 22 and the optical path of the reflected light incident on the light-receiving element 11 reflected by the explosion-proof valve 22 are schematically shown by arrows.

The optical component control unit 12 supplies power to the light emitting element 10 and amplifies the signal of the light receiving element 11 and inputs the amplified signal to the deterioration determination unit 13. Thereby, the intensity of light corresponding to the amount of light incident on the light receiving element 11 is detected as a voltage signal. Hereinafter, a signal (for example, a voltage value) input to the deterioration determination unit 13 is referred to as “incident light amount to the light receiving element 11”.
Although the case where the intensity of light is detected as a voltage signal will be described here, the present invention is not limited to this, and any physical quantity corresponding to the reflected light incident on the light receiving element 11 may be detected.

The deterioration determination unit 13 determines an abnormality in the deterioration state of the aluminum electrolytic capacitor 200 based on the amount of light incident on the light receiving element 11. Details will be described later.
The notification means 14 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 13.
The stop unit 15 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 determination unit 13.
Note that either one of the notification unit 14 or the stop unit 15 may be omitted.

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.
Capacitor degradation diagnosis device 100 is not limited to an aluminum electrolytic capacitor, but is a capacitor provided with an explosion-proof valve that expands to prevent explosion when the internal pressure increases. Good. 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 showing the relationship between the usage time of the aluminum electrolytic capacitor and the expansion of the explosion-proof valve.
As shown in FIG. 4, the explosion-proof valve 22 of the aluminum electrolytic capacitor 200 expands by evaporating the electrolyte as the usage time elapses, and gradually increasing the internal pressure. When the explosion-proof valve 22 further expands and the stress on the groove 20b exceeds the limit, the valve is opened (punctured), and the internal gas is released to end the life.

FIG. 5 is a diagram schematically showing an optical path in the swollen state of the explosion-proof valve according to the first embodiment.
FIG. 6 is a diagram showing the relationship between the expansion of the explosion-proof valve and the amount of light incident on the light receiving element according to the first embodiment.
As shown in FIG. 5, when the explosion-proof valve 22 expands, the reflection angle of light from the light emitting element 10 changes, and the amount of reflected light incident on the light receiving element 11 decreases. As a result, as shown in FIG. 6, the amount of incident light to the light receiving element 11 decreases as the explosion-proof valve swells. When the explosion-proof valve 22 is opened, the expansion stops and the amount of reflected light does not change, so that the amount of light incident on the light receiving element 11 is constant.
For this reason, it is possible to detect the swelling of the explosion-proof valve 22 by detecting the amount of light incident on the light receiving element. That is, by detecting the degree of swelling of the explosion-proof valve 22 that appears as a sign of abnormality in the aluminum electrolytic capacitor 200, it is possible to determine the abnormality of the deterioration state of the aluminum electrolytic capacitor 200 as a result.

  In the present embodiment, as shown in FIG. 6, a deterioration determination level that is greater than the amount of light incident on the light receiving element when the explosion-proof valve 22 is opened is set in the deterioration determination means 13 in advance. And the deterioration determination means 13 determines the abnormality of the deterioration state of the aluminum electrolytic capacitor 200, when the incident light quantity to a light receiving element is smaller than this deterioration determination level (b point of FIG. 6). That is, as shown in FIG. 2, when the explosion-proof valve 22 is not expanded normally or when the explosion-proof valve 22 is small in expansion (in the case of the point a or less in FIG. 6), the deterioration determination means 13 is in a deteriorated state. Although it is determined to be normal, when the expansion of the explosion-proof valve 22 is large as shown in FIG. 5 (when the point a in FIG. 6 is exceeded), the deterioration determination means 13 determines that the deterioration state is abnormal.

  The amount of expansion of the explosion-proof valve 22 and the amount of reflection of the explosion-proof valve 22 differ depending on the shape and type of the aluminum electrolytic capacitor 200 and also vary depending on the positional relationship between the light emitting element 10 and the light receiving element 11 and the aluminum electrolytic capacitor 200. It is better to set with experimental values that measure the actual amount of change when deterioration occurs.

The deterioration determination unit 13 outputs a determination result of the deterioration state to the notification unit 14. The notification unit 14 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 13 outputs the determination result of the deterioration state to the stop unit 15. For example, the stopping unit 15 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 unit 15 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, in the present embodiment, light is emitted toward the explosion-proof valve 22 and the reflected light is received by the light receiving element 11. Based on the detection value of the light receiving element 11, the abnormality of the deterioration state of the aluminum electrolytic capacitor 200 is determined. For this reason, it is possible to detect the deterioration state abnormality of the aluminum electrolytic capacitor 200 with high accuracy.
In addition, since it is not necessary to mount a temperature sensor and a band for the temperature sensor, the manufacturing cost can be reduced. In addition, a decrease in detection accuracy due to mounting errors can be avoided as compared with the conventional temperature detection method. Moreover, it is not necessary to consider the heat resistant temperature of the band or the like.
Further, since the reflected light from the explosion-proof valve 22 is detected, it is difficult to be affected by the heat generated by the aluminum electrolytic capacitor 200, and it is possible to detect an abnormality of the aluminum electrolytic capacitor 200 with high accuracy and high reliability.
Further, it is possible to detect the deterioration of the aluminum electrolytic capacitor 200 with high accuracy and high reliability without being affected by the manufacturing cost reduction and the heat generation of other electronic components in the abnormality detection of the aluminum electrolytic capacitor 200.
Moreover, the internal electrolyte solution due to the operation (opening) of the explosion-proof valve 22 leaks, and it is mistaken for the user to emit smoke, so that the concern about fire safety and the influence on the health caused by the vapor can be resolved. .

  In addition, since a light emitting element 10 that emits light and a light receiving element 11 that receives reflected light are provided, and an abnormality in the deterioration state of the aluminum electrolytic capacitor 200 is determined based on a detection value of the light receiving element 11, a capacitor deterioration diagnosis device Can be realized with an inexpensive configuration.

  Further, the light emitting element 10 and the light receiving element 11 are arranged to face the explosion-proof valve 22 of the aluminum electrolytic capacitor 200, and the deterioration determining means 13 is configured to perform aluminum electrolysis when the detected value of the light receiving element 11 is smaller than a predetermined deterioration determining level. An abnormality in the deterioration state of the capacitor 200 is determined. For this reason, it is possible to detect the expansion of the explosion-proof valve 22 of the aluminum electrolytic capacitor 200, and as a result, it is possible to accurately determine an abnormality in the deterioration state of the aluminum electrolytic capacitor 200.

  Further, by notifying the determination result of the deterioration state of the aluminum electrolytic capacitor 200 by the notification means 14, information regarding the deterioration state of the aluminum electrolytic capacitor 200 can be notified to the user. Thereby, the user can stop the operation of the device on which the aluminum electrolytic capacitor 200 is mounted, for example, and can prevent the generation of smoke or a strange odor due to the opening of the explosion-proof valve 22 of the aluminum electrolytic capacitor 200.

  Further, according to the determination result of the deterioration state of the aluminum electrolytic capacitor 200, the stopping unit 15 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. As a result, when the deterioration state of the aluminum electrolytic capacitor 200 is abnormal, the operation of the device on which the aluminum electrolytic capacitor 200 is mounted can be stopped, and smoke or a strange smell caused by opening the explosion-proof valve 22 of the aluminum electrolytic capacitor 200 can be stopped. Occurrence can be prevented.

  The light emitting element 10 and the light receiving element 11 are mounted on an optical component substrate 110, and the optical component substrate 110 is fixed to a capacitor mounting substrate 210 on which an aluminum electrolytic capacitor 200 is mounted. For this reason, the positional relationship between the light-emitting element 10 and the light-receiving element 11 and the explosion-proof valve 22 of the aluminum electrolytic capacitor 200 is fixed, and the reflected light incident on the light-receiving element 11 changes according to the expansion of the explosion-proof valve 22. An abnormality in the deterioration state of the aluminum electrolytic capacitor 200 can be accurately determined.

As a method for fixing the optical component 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, spacers 111 are arranged between the optical component substrate 110 and the capacitor mounting substrate 210, and each substrate and the spacer 111 are fixed with screws 112, so that the light is applied to the capacitor mounting substrate 210. The component substrate 110 is fixed.
Further, for example, as shown in FIG. 8, the optical component substrate 110 is fixed to the housing 120 of the device on which the aluminum electrolytic capacitor 200 is mounted with screws 121.
The method for fixing the optical component substrate 110 is not limited to this, and any method may be used as long as the light emitting element 10 and the light receiving element 11 can be disposed to face the explosion-proof valve 22.

Embodiment 2. FIG.
The deterioration determination means 13 in the present second embodiment determines a plurality of deterioration determination levels in advance and determines the degree of abnormality of the deterioration state 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 expansion of the explosion-proof valve according to the second embodiment and the amount of light incident on the light receiving element.
A plurality of deterioration determination levels are set in advance in the deterioration determination means 13 in the second embodiment. For example, as shown in FIG. 9, deterioration determination levels 1 to 3 (b1 to b3) are set corresponding to three expansion amounts a1 to a3 that are smaller than the expansion at which the explosion-proof valve 22 opens.
The deterioration determination means 13 compares the amount of light incident on the light receiving element and the deterioration determination levels 1 to 3, and determines the degree of abnormality in the deterioration state according to each deterioration determination level.
Since the amount of swelling of the explosion-proof valve 22 and the amount of reflection of the explosion-proof valve 22 differ 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 actual changes and the like.

For example, the deterioration determination unit 13 determines that the deterioration state is normal because the amount of swelling of the explosion-proof valve 22 is small until the amount of light incident on the light receiving element is b1.
On the other hand, when the amount of light incident on the light receiving element is less than b1, the expansion amount of the explosion-proof valve 22 is large, that is, the deterioration state is abnormal, and a predetermined abnormality degree is determined according to the deterioration determination levels 1 to 3. To do. The deterioration determination unit 13 outputs a determination result of the deterioration state to the notification unit 14.
For example, when the deterioration determination level is below 1, it is determined that the degree of abnormality is a caution state. Moreover, when it falls below the degradation determination level 2, it determines with the grade of abnormality being a warning state. Moreover, when it falls below the degradation determination level 3, it determines with the grade of abnormality being a interruption | blocking state.
And the alerting | reporting means 14 displays the information (for example, attention, warning, interruption | blocking, etc.) regarding the grade of the degradation state determined, for example by segment LED, the liquid crystal display element, etc. according to the grade of abnormality. 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 13 outputs a determination result of the degree of abnormality of the deterioration state to the stop unit 15. The stopping unit 15 outputs, for example, an apparatus in which the aluminum electrolytic capacitor 200 is mounted according to the determined degree of abnormality.
For example, if the degree of abnormality is a caution state, no output is made to the device. When the degree of abnormality is a warning state, a signal instructing a decrease in the output power of the device is output. In addition, when the degree of abnormality is a 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.
For example, the remaining life of the aluminum electrolytic capacitor 200 is determined by dividing the explosion-proof valve 22 from a state where the explosion-proof valve 22 does not swell to a swell limit value (life) into a plurality of equal intervals and setting a deterioration determination level for each of the sections. You may do it.

As described above, in the present embodiment, the deterioration determination unit 13 sets a plurality of deterioration determination levels in advance, and determines the degree of abnormality of the deterioration state 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 an 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 device 100 detects an abnormality in the deterioration state 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 15 of the capacitor deterioration diagnosis apparatus 100 outputs a predetermined signal corresponding to the deterioration state to the control unit 6.
For example, the stop unit 15 outputs a stop signal and a signal instructing a decrease in the output power of the load (motor 7) to the control unit 6 based on the output of the deterioration determination unit 13.

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 present embodiment, since the operation of the inverter circuit 5 is controlled according to the determination result of the deterioration determination means 13, the generation of smoke and odor due to the opening of the explosion-proof valve 22 of the aluminum electrolytic capacitor 200 is prevented. Can be prevented.

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.
11, the air conditioner in the present 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, and heat (not shown). A blower 312 for an outdoor unit that blows the exchange 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 Light emitting element, 11 Light receiving element, 12 Optical component control means, 13 Deterioration judgment means, 14 Notification means, 15 Stop means, 20 Case, 20a Top surface, 20b Groove, 21 Resin, 22 Explosion-proof valve, 100 Capacitor deterioration diagnosis device, 110 Optical component substrate, 111 Spacer, 112 Screw, 120 Housing, 121 Screw, 200 Aluminum Electrolytic capacitor, 210 capacitor mounting board, 300 inverter device, 310 outdoor unit, 311 refrigerant compressor, 312 blower, 320 indoor unit.

Claims (8)

A capacitor deterioration diagnosis device that detects an abnormality in the deterioration state of an electrolytic capacitor having an explosion-proof valve,
A light emitting element that emits light toward the explosion-proof valve;
A light receiving element that receives reflected light from the explosion-proof valve;
A capacitor deterioration diagnosing device, comprising: a deterioration determining unit that determines an abnormality in a deterioration state of the electrolytic capacitor based on a detection value of the light receiving element. The light emitting element and the light receiving element are disposed to face the explosion-proof valve of the electrolytic capacitor,
The deterioration determining means includes
2. The capacitor deterioration diagnosis device according to claim 1, wherein when the detected value of the light receiving element is smaller than a predetermined deterioration determination level, an abnormality in the deterioration state of the electrolytic capacitor is determined. The deterioration determining means includes
3. The capacitor deterioration diagnosis apparatus according to claim 2, wherein a plurality of the deterioration determination levels are set in advance, and the degree of abnormality of the deterioration state of the electrolytic capacitor is determined in multiple stages. The capacitor deterioration diagnosis apparatus according to any one of claims 1 to 3, further comprising a notification unit configured to notify information related to the deterioration state determined by the deterioration determination unit. The light emitting element and the light receiving element are mounted on a first substrate,
The first substrate is
The capacitor deterioration diagnosis apparatus according to any one of claims 1 to 4, wherein the capacitor deterioration diagnosis apparatus is fixed to a second substrate on which the electrolytic capacitor is mounted. An electrolytic capacitor having an explosion-proof valve for smoothing the rectified power supply voltage;
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;
An inverter device comprising the capacitor deterioration diagnosis device according to any one of claims 1 to 5. 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 in accordance with a determination result of the deterioration determination unit. An inverter device according to claim 6 or 7,
A home appliance comprising a load driven by the inverter circuit.

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