JP2010060305A - Capacitor deterioration detector and household equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a capacitor deterioration detector and household equipment that precisely detect abnormality in a deteriorated state of a capacitor by an inexpensive configuration. <P>SOLUTION: The capacitor deterioration detector includes: a current detection means 6 for detecting a charged/discharged current of a capacitor 4 repeating charging/discharging at a prescribed period at prescribed sampling timing in synchronization with the period; and a deterioration determination means 7 for determining abnormality in a deteriorate state of the capacitor according to output from the current detection means 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a capacitor deterioration detection device that detects deterioration of a capacitor and a home appliance including the capacitor deterioration detection device.

  Conventionally, as an example of detecting a failure of a circuit component, for example, “When a temperature sensor is provided for each heat generating component in a DC stabilized power supply circuit and an abnormal temperature signal is detected from any one of the temperature sensors, the DC stable DC stabilized power supply circuit characterized in that it includes means for cutting off the input to the stabilized power supply circuit or means for cutting off the control line of the stabilized DC power supply circuit "(for example, Patent Documents). 1).

  Further, for example, “a DC / DC converter main body having a multi-output terminal, a temperature sensor provided in a heat generating component in the converter main body that outputs a control signal when an abnormal temperature is reached, and an output section of the multi-output terminal are provided. An output stop unit that cuts off the output voltage by an external drive signal, and an output control circuit that inputs the control signal of the temperature sensor and sequentially outputs the drive signal to the output stop unit in a predetermined order. A DC / DC converter characterized in that it has been proposed "(for example, see Patent Document 2).

JP-A-9-330136 (Claim 1) JP-A-6-141535 (Claim 1)

  Conventional degradation detectors have a problem in that the temperature sensor is physically attached to the circuit components and the degradation state is judged based on the output of the temperature sensor. was there.

  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 it is an object of the present invention to obtain a capacitor deterioration detection device and a home appliance that can accurately detect a deterioration state of a capacitor with a low-cost configuration. Objective.

  A capacitor deterioration detection device according to the present invention includes a current detection unit that detects a charge / discharge current of a capacitor that repeats charging / discharging at a predetermined cycle at a predetermined sampling timing synchronized with the cycle, and a capacitor from an output of the current detection unit. Deterioration determining means for determining an abnormality in the deterioration state of the apparatus.

  According to the present invention, by detecting the charge / discharge current of the capacitor at a predetermined sampling timing and judging the abnormality of the deterioration state of the capacitor, the detection of the abnormality of the deterioration state of the capacitor can be realized with high accuracy and at a low cost. it can.

Embodiment 1 FIG.
FIG. 1 is a block configuration diagram of the capacitor deterioration detection apparatus according to the first embodiment. In FIG. 1, the capacitor deterioration detection device includes current detection means 6, deterioration determination means 7, and notification means 8. As shown in FIG. 1, this capacitor deterioration detection device includes, for example, a capacitor 4 in a half-wave rectifier circuit that rectifies an AC voltage of a power supply 1 by a diode 3, smoothes the voltage by a capacitor 4 and supplies DC power to a load 5. This is to detect the deterioration.

  The current detection means 6 includes a current detector 61 that detects the charge / discharge current Ic of the capacitor 4 and converts it to a predetermined voltage level, and an A / D converter 62 that detects the output of the current detector 61 as a digital value. It is configured.

  The deterioration determination unit 7 determines an abnormality in the deterioration state of the capacitor 4 from the detection result of the A / D converter 62 and outputs the determination result to the notification unit 8 by an operation described later. For example, the deterioration determination means 7 can be configured as software executed by an arithmetic device such as a microcomputer, or can be configured as hardware such as a circuit device. When implemented as software, a program for realizing the function is stored in a ROM or the like, and an arithmetic device such as a microcomputer reads the program and executes processing corresponding to the function of each unit in accordance with the instructions of the program Can be configured.

The notification means 8 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 capacitor 4 based on the output of the deterioration determination means 7.
Next, the operation of the first embodiment will be described with reference to FIGS.

  FIG. 2 is a diagram showing a capacitor charging / discharging current waveform and power supply voltage waveform in a normal state according to the first embodiment, and FIG. 3 is a diagram showing a capacitor charging / discharging current waveform and power supply voltage waveform in an abnormal state according to the first embodiment. is there. As shown in FIGS. 2 and 3, in the half-wave rectifier circuit, the capacitor 4 is charged at a phase near the + peak time of the power supply voltage (point A), and then the charge charged in the capacitor 4 is changed. It is supplied to the load 5 as a discharge current. That is, the period during which the charging current is supplied to the capacitor 4 (+ side current in the figure) is the charging period, and the period during which the discharging current is supplied (− side current in the figure) is the discharging period. The magnitude of such a charging current depends on the capacitance of the capacitor 4, and the charging current decreases as the capacitance decreases. In particular, the peak value of the charging current is significantly reduced. Further, the amount of decrease in the discharge current during the discharge period depends on the capacitance of the capacitor 4 when the load is constant. Further, it is known that the capacitance of the capacitor decreases due to the deterioration. Therefore, a decrease in the capacitance of the capacitor 4 can be detected from the decrease amount of the charge / discharge current Ic, and as a result, the deterioration state of the capacitor 4 can be determined.

  For this reason, in the present embodiment, the charging / discharging current Ic of the capacitor 4 is detected at any one of the phases of the charging period of the capacitor 4 synchronized with the cycle of the power supply voltage, and the decrease in the current is detected. The deterioration of the capacitor 4 is determined by monitoring. For example, the A / D converter 62 detects the charging current Ic_max at the + peak phase (point A) of the power supply voltage that is substantially synchronized with the peak phase of the charging current in the phase of the charging period of the capacitor 4. This point A is a + peak phase at which the power supply voltage is maximized, and is a quarter of the power supply cycle from the zero cross 1 (T1 = 5 ms when the power supply frequency is 50 Hz).

  Next, when the value of the detected charging current Ic_max is smaller than a predetermined deterioration determination level Ic_ref set in advance, the deterioration determination means 7 determines an abnormality in the deterioration state. That is, when the capacitance of the capacitor 4 is normal as shown in FIG. 2, Ic_ref <Ic_max is satisfied, and the deterioration determination means 7 determines that the deterioration state is normal, but the capacitance of the capacitor 4 as shown in FIG. When Ic_ref is reduced, Ic_ref> Ic_max, and the deterioration determination means 7 determines that the deterioration state is abnormal.

  Note that the deterioration determination level Ic_ref varies depending on the capacitance of the capacitor 4 and also varies depending on the operating state of the load 5, so it is preferable to set the deterioration determination level Ic_ref based on an experimental value obtained by measuring an actual change amount when the deterioration occurs.

  The deterioration determination unit 7 outputs a determination result of the deterioration state of the capacitor 4 to the notification unit 8. The notification unit 8 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 contents (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.

  As described above, in the present embodiment, since the abnormality in the deterioration state is determined based on the charging current Ic_max of the capacitor 4, the detection of the abnormality in the deterioration state of the capacitor 4 can be realized with high accuracy. In addition, there is no need to mount a temperature sensor and a band for the temperature sensor, the manufacturing cost and mounting area can be reduced, and an inexpensive configuration can be achieved.

  Further, in sampling the charging / discharging current Ic of the capacitor 4, only one point synchronized with the cycle of the power supply voltage is sampled, so that high-speed A / D conversion and data processing are not required, and A / A D converter, a microcomputer having a general data processing speed, or the like can be used, and the capacitor deterioration detection device can be realized with an inexpensive configuration.

  In addition, by notifying the determination result of the deterioration state of the capacitor 4 by the notification means 8, information regarding the deterioration state of the capacitor 4 can be notified to the user. As a result, the user can stop the operation of the load 5 and prevent smoke and fire due to the deterioration failure of the capacitor 4.

  In the first embodiment, the case where the charging current Ic_max is detected in the + peak phase of the power supply voltage has been described. However, since the peak phase of the charging current varies depending on the power factor of the load 5, the detection timing of Ic_max is set. Alternatively, it may be set at the peak phase obtained from the actual experimental value according to the load 5 or its operating state.

  In the first embodiment, the case of the point A as the measurement point of Ic_max has been described. However, the present invention is not limited to this, and any timing at which the power supply voltage is synchronized may be used, for example, a discharge period (FIG. 2). , In FIG. 3, it may be the phase of the negative current).

  In the first embodiment, the case where the deterioration determination unit 7 outputs an abnormality of the deterioration state when the charging current Ic_max is even smaller than the deterioration determination level Ic_ref has been described. However, the present invention is not limited to this. Instead, the deterioration state may be determined to be abnormal when the deterioration determination level is continuously exceeded within a predetermined time or when the deterioration determination level is exceeded a predetermined number of times.

Embodiment 2. FIG.
In the second embodiment, a description will be given of a mode provided with a drive unit that controls the operation of the load 5 in accordance with the determination result of the deterioration determination unit 7. Hereinafter, the second embodiment will be described with reference to FIG. 4 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. 4 is a block diagram of the capacitor deterioration detection apparatus according to the second embodiment. In FIG. 4, in the second embodiment, in addition to the configuration of the first embodiment, a drive unit 9 that includes, for example, a triac and controls the load 5 based on the output of the deterioration determination unit 7 is provided. In addition, the deterioration determination unit 7 in the present embodiment outputs a determination result of the deterioration state to the drive unit 9.

  In the capacitor deterioration detection device according to the second embodiment, the current detection means 6 detects the charging current Ic_max of the capacitor 4 and the deterioration determination means 7 determines the deterioration state by the same operation as in the first embodiment. Do. Then, the drive unit 9 controls the load 5 based on the output of the deterioration determination unit 7. The load 5 is controlled so as to stop the operation by shutting off the power supply to the load 5 so that safety can be ensured without causing smoke or ignition even when the capacitor 4 is deteriorated. To do. It is also possible to continue the operation by supplying electric power that can ensure safety without stopping the operation of the load 5, for example, it is possible to control the supply power to be smaller than that during normal use. . With such a method, it is possible to avoid a situation in which the user cannot suddenly use the device while using it.

  As described above, in the present embodiment, in addition to the effects of the above-described first embodiment, the operation of the load 5 is controlled according to the determination result of the deterioration determination means 7, thereby preventing smoke and ignition due to capacitor deterioration. It is possible to provide a capacitor deterioration detection device that can be used.

Embodiment 3 FIG.
In the first and second embodiments, the case where the discharge current is supplied to the load 5 has been described. In the third embodiment, detection of deterioration in a no-load state where the discharge current of the capacitor 4 is not supplied to the load 5 is described. explain. Note that the configuration of the capacitor deterioration detection device in the present embodiment is the same as that in the second embodiment, and the same parts are denoted by the same reference numerals and description thereof is omitted.

FIG. 5 is a diagram showing a capacitor charge / discharge current waveform and power supply voltage waveform in a normal state according to the third embodiment, and FIG. 6 is a diagram showing a capacitor charge / discharge current waveform and power supply voltage waveform in an abnormal state according to the third embodiment. is there.
For example, the discharge current from the capacitor 4 is not supplied to the load 5 in a no-load state where the energization of the load 5 is stopped by the control of the driving means 9. If the deterioration state of the capacitor 4 is normal, the leakage current generated in the capacitor 4 is not very small. Therefore, after the capacitor is completely charged, the charge / discharge current Ic of the capacitor 4 is almost zero as shown in FIG. Become. On the other hand, when the capacitor deteriorates, the leak current generated in the capacitor 4 increases, and as shown in FIG. 6, a charge / discharge current is generated by this leak current even in a no-load state. Therefore, an increase in leakage current accompanying the deterioration of the capacitor 4 can be detected based on the magnitude of the charge / discharge current Ic, and as a result, the deterioration state of the capacitor 4 can be determined.

  Therefore, in the present embodiment, a deterioration determination level corresponding to the no-load state is set as the deterioration determination level Ic_ref of the deterioration determination means 7. The current detection means 6 detects the charging current Ic_max to the capacitor 4 and the deterioration determination means 7 uses the deterioration determination level corresponding to the no-load state by the same operation as in the first embodiment. Make a decision. That is, as shown in FIG. 5, when there is no leakage current in the capacitor 4, Ic_ref> Ic_max (≈0), and the deterioration determining means 7 determines that the deterioration state is normal, but as shown in FIG. When the leakage current of 4 increases, Ic_ref <Ic_max, and the deterioration determination unit 7 determines that the deterioration state is abnormal. Since the deterioration determination level Ic_ref differs depending on the capacitor 4, it is preferable to set the deterioration determination level Ic_ref with an experimental value obtained by measuring an actual change amount or the like when the deterioration occurs.

  And the alerting | reporting means 8 displays the information regarding a deterioration state. In addition, you may make it alert | report a warning sound using a speaker etc. as the alerting | reporting means 8, for example. The driving unit 9 controls the load 5 based on the output of the deterioration determining unit 7. For example, when it is determined that the deterioration state is abnormal when there is no load, control is performed so that the operation of the load 5 is not started.

  As described above, in the present embodiment, in addition to the effects of the first or second embodiment, in the no-load state, the deterioration state is determined using the deterioration determination level according to the no-load state. Even in the load state, the deterioration state of the capacitor can be determined.

  Moreover, since the deterioration state of the capacitor is judged in a no-load state, for example, when the load 5 is operated by a timer control or the like, the deterioration abnormality of the capacitor 4 is notified while the user is not in the vicinity of the apparatus and is used accordingly. The person can stop energization of the capacitor 4 and prevent smoke and ignition due to deterioration failure of the capacitor 4.

  In the case where the notification means 8 notifies with a warning sound, the volume of the warning sound may be changed according to the time zone. For example, time information may be acquired from RTC or the like, and the volume of the warning sound may be changed between, for example, night and day. Thus, for example, even when waiting at night by timer control or the like, a warning sound having a volume corresponding to the notification time can be notified.

  In the present embodiment, only the operation in the no-load state has been described, but in addition to the above-described operation, the deterioration determination means 7 includes the deterioration determination level in the no-load state and the deterioration determination level in the load 5 in the operation state. And the deterioration state may be determined using the corresponding deterioration determination level according to the operation control state of the drive unit 9. That is, the deterioration determination level according to the first or second embodiment described above may be used during the operation of the load 5, and the deterioration determination level corresponding to the no-load state may be used in the no-load state.

Embodiment 4 FIG.
In the fourth embodiment, a mode including a storage unit that stores the determination result of the deterioration determination unit 7 will be described. Hereinafter, the present embodiment will be described with reference to FIG. 7, focusing on differences from the second embodiment. The same parts as those in the second embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 7 is a block configuration diagram of the capacitor deterioration detection apparatus according to the fourth embodiment. 7, in the present embodiment, in addition to the configuration of the above-described second embodiment, for example, an EEPROM-ROM or the like that can electrically read, write, and erase the stored contents, and stores the output of the degradation determination means 7 is stored. Storage means 11 is provided.

  The storage unit 11 is electrically written with the determination result as to whether or not the deterioration state of the capacitor 4 when the load 5 was last operated is normal immediately before the storage unit 11 is turned off. When the load 5 is operated again, the deterioration determining means 7 first reads the stored contents of the storage means 11 at the previous operation, determines whether the connection state is normal or abnormal, and the driving means 9 The judgment result is output for.

  The drive unit 9 controls the load 5 based on the output of the deterioration determination unit 7. That is, when the judgment result at the previous operation stored in the storage unit 11 is abnormal, the drive unit 9 does not start the operation of the load 5. On the other hand, when the deterioration state is normal, the driving unit 9 controls the load 5 to start the operation, and a current is supplied to the load 5 to start the operation. Thereafter, since the waveform and operation until the charge / discharge current Ic is detected and finally the deterioration state is determined to be normal are the same as those in the first or second embodiment, detailed operation description will be given here. Will be omitted.

  As described above, in the fourth embodiment, in addition to the effects of the first and second embodiments, the output of the deterioration determining means 7 is written in the storage means 11 and before the load 5 is energized when the next operation is started. The output information of the deterioration judgment means 7 at the previous operation of the storage means 11 is read into the storage means 11, and the operation of the load 5 is controlled based on the read contents. 5 re-operation can be prevented. As a result, it is possible to provide a capacitor deterioration detection device capable of preventing smoke and ignition accompanying capacitor deterioration.

  In the present embodiment, the case where an EEP-ROM is used as the storage means 11 has been described. However, the present invention is not limited to this, and even a storage element that loses its memory when the power is turned off may be a battery or the like. Needless to say, the same effect can be obtained by using a memory element that can store power by supplying electric power, or a latching relay that can memorize mechanically.

Embodiment 5 FIG.
In the fifth embodiment, an embodiment provided with an opening / closing means for cutting off power supply to the load 5 in accordance with the determination result of the deterioration determination means 7 will be described. Hereinafter, the fifth embodiment will be described with reference to FIG. 8 with a focus on differences from the second embodiment. The same parts as those in the second embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 8 is a block diagram of the capacitor deterioration detection apparatus according to the fifth embodiment. In FIG. 8, in this embodiment, in addition to the configuration of the second embodiment, an opening / closing means 10 for cutting off the supply of the power source 1 to the load 5 by cutting off the circuit is provided. The opening / closing means 10 uses an opening / closing device such as a self-holding circuit of a relay that holds off the power supply after the power supply is shut off. In addition, the deterioration determination unit 7 in the present embodiment outputs a determination result of the deterioration state to the opening / closing unit 10.

In the capacitor deterioration detection apparatus according to the fifth embodiment, the current detection means 6 detects the charging current Ic_max of the capacitor 4 and the deterioration determination means 7 determines the deterioration state by the same operation as in the second embodiment. Do. While the deterioration determining means 7 determines that it is normal, the opening / closing means 10 is in a closed state. Then, the driving unit 9 controls the load 5 based on the output of the deterioration determining unit 7. On the other hand, when the deterioration determining means 7 determines that the deterioration state is abnormal, the opening / closing means 10 cuts off the supply of the power source 1 supplied to the load 5 and stops the operation of the load 5. Furthermore, when the opening / closing means 10 shuts off the power supply to the load 5 and stops the operation, the notification means 8 displays that this is due to the deterioration abnormality of the capacitor 4. This makes it possible to notify the user why the operation of the load 5 has stopped.
In addition, the power supply to the notification means 8 includes a method of supplying power from a system different from the power source 1, using a battery, or using an electric double layer capacitor.

  As described above, in the fifth embodiment, in addition to the effects of the first and second embodiments, when the deterioration state is abnormal, the power supply 1 supplied to the load 5 by the switching means 10 is shut off. Therefore, when the deterioration state of the capacitor 4 is abnormal, re-operation of the load 5 can be prevented. As a result, it is possible to provide a capacitor deterioration detection device capable of preventing smoke and ignition accompanying capacitor deterioration.

  In the above description, a case where an opening / closing device is used as the opening / closing means 10 has been described. However, the present invention is not limited to this. For example, when the deterioration determining means 7 determines a connection abnormality, a current fuse or the like is disconnected, and the load 5 May not be energized.

Embodiment 6 FIG.
The capacitor deterioration detection device in the present embodiment detects the deterioration of the capacitor in the double wave voltage doubler rectifier circuit instead of the half wave rectifier circuit in the first to fifth embodiments described above. Hereinafter, the sixth embodiment will be described with reference to FIGS. 9 and 10, 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 block diagram of a capacitor deterioration detection apparatus according to the sixth embodiment. As shown in FIG. 9, a full-wave rectifier circuit is formed by diodes 3a to 3d, and a capacitor 4a, which is a first capacitor (C1) charged when the power supply voltage is in a positive phase, and when the power supply voltage is in a negative phase A double wave rectifier circuit is constituted by the capacitor 4b which is the second capacitor (C2) to be charged, and the output of the double wave rectifier circuit is supplied to the load 5. The capacitor deterioration detection device in the present embodiment detects charge / discharge currents Ic1 and Ic2 supplied to each capacitor, and detects deterioration of capacitors 4a and 4b.

FIG. 10 is a diagram showing a capacitor charge / discharge current waveform and a power supply voltage waveform according to the sixth embodiment. FIG. 10 (a) is a diagram showing a charge / discharge current waveform of the capacitor 4a, and FIG. 10 (b) is a diagram of the capacitor 4b. The figure which shows a charging / discharging electric current waveform, FIG.10 (c) is a figure which shows a power supply voltage waveform.
In the double-wave voltage doubler rectifier circuit, as shown in FIG. 10A, the charge / discharge current Ic1 is charged to the capacitor 4a at a phase near the + peak time of the power supply voltage (point A), and thereafter The electric charge charged in the capacitor 4a is supplied to the load 5 as a discharge current. Further, as shown in FIG. 10 (b), the charge / discharge current Ic2 is charged to the capacitor 4b (point B) at a phase near the negative peak of the power supply voltage, and then the charge charged to the capacitor 4b. Is supplied to the load 5 as a discharge current.

  Therefore, in the present embodiment, the current detector 61a and the A / D converter 62a that detect the charging / discharging current of the capacitor 4a, and the current detector 61b and the A / D converter that detect the charging / discharging current of the capacitor 4b. D converter 62b. The A / D converter 62a detects the charging current Ic1_max at the + peak phase (point A) of the power supply voltage substantially synchronized with the peak phase of the charging current of the capacitor 4a. The A / D converter 62b detects the charging current Ic2_max at the minus peak phase (point B) of the power supply voltage that is substantially synchronized with the peak phase of the charging current of the capacitor 4b.

  Here, point A is the + peak phase at which the power supply voltage is maximized, and is a quarter of the power cycle from zero cross 1 (T1 = 5 ms when the power supply frequency is 50 Hz), and point B is The power supply voltage becomes the minimum—the peak phase, which is 3/4 of the power supply cycle after the zero cross 1 (T2 = 15 ms when the power supply frequency is 50 Hz).

  Next, the deterioration determination means 7 determines that the deterioration state of the capacitor 4a is abnormal when the value of the charge / discharge current detected in the positive phase of the power supply voltage is smaller than a predetermined deterioration determination level Ic_ref set in advance. To do. Similarly, when the value of the charge / discharge current detected in the negative phase of the power supply voltage is smaller than a predetermined deterioration determination level Ic_ref, it is determined that the deterioration state of the capacitor 4b is abnormal.

  That is, as shown in FIG. 10 (a), when the capacitance of the capacitor 4b is normal but the capacitance of the capacitor 4a is reduced, Ic1_max becomes smaller and Ic_ref> Ic1_max, and the deterioration determination means 7 It is determined that the deterioration state of the capacitor 4a is abnormal. Then, Ic2_max is large and Ic_ref <Ic2_max, and the deterioration determination unit 7 determines that the deterioration state of the capacitor 4b is normal. Similarly, it can be determined whether the capacitor 4a is normal and the capacitor 4b is abnormal, or whether both the capacitors 4a and 4b are abnormal.

  The deterioration determination level Ic_ref varies depending on the capacitor, and also varies depending on the load 5 and its operating state. Therefore, it is preferable to set the deterioration determination level Ic_ref based on an experimental value obtained by measuring an actual change amount when the deterioration occurs.

  Thereafter, the operation after determining the deterioration state is the same as that in the first embodiment.

  As described above, in the present embodiment, similarly to the first embodiment, it is possible to accurately detect the deterioration state abnormality, to reduce the manufacturing cost and the mounting area, and to achieve an inexpensive configuration. can do.

  Further, in addition to the effect of the first embodiment, in the sixth embodiment, the deterioration determining means 7 determines abnormality of the deterioration state of the capacitor 4a and the capacitor 4b in accordance with the phase of the power supply voltage. In the voltage rectifier circuit, it is not necessary to provide the deterioration determining means 7 for each capacitor, and it is possible to determine the deterioration abnormality with a simpler and cheaper configuration.

Embodiment 7 FIG.
In the sixth embodiment, each capacitor is provided with a current detector 61 to detect each charge / discharge current. However, in the seventh embodiment, one current detector that flows in the common line of the double voltage rectifier circuit is provided. Are provided to detect deterioration of each capacitor. Hereinafter, the seventh embodiment will be described with reference to FIGS. 11 to 13 with a focus on differences from the sixth embodiment. The same parts as those in the sixth embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 11 is a block diagram of a capacitor deterioration detection apparatus according to the seventh embodiment. As shown in FIG. 11, in the seventh embodiment, current detection for detecting a charging current flowing in a common line (hereinafter simply referred to as “common line”) in which one electrode of the capacitor 4a and the capacitor 4b is connected in common. Only one vessel 61 is provided. The capacitor deterioration detection device in the present embodiment detects the deterioration of the capacitors 4a and 4b by detecting the charging current flowing through the common line.

  FIG. 12 is a diagram illustrating a capacitor charging current waveform and a power supply voltage waveform in a normal state according to the seventh embodiment, and FIG. 13 is a diagram illustrating a capacitor charging current waveform and a power supply voltage waveform in an abnormal state according to the seventh embodiment. As shown in the figure, in the double voltage rectifier circuit, the capacitor 4a is charged at a phase (point A) near the + peak time of the power supply voltage, and a charging current Ic1 flows through the common line. In addition, the capacitor 4b is charged at a phase (point B) near the negative peak of the power supply voltage, and a charging current Ic2 flows through the common line. 12 and 13, the charging current is illustrated with the power source side of the current detector 61 as the positive direction.

  As described above, when the capacitance of the capacitor decreases, the charging current significantly decreases at the peak value. Further, the phase of the charging current of the capacitor 4a is synchronized with the positive phase of the power supply voltage, and the phase of the charging current of the capacitor 4b is synchronized with the negative phase of the power supply voltage. For this reason, it can be discriminated whether the capacitance of the capacitor 4a or the capacitor 4b is reduced by the amount of decrease in the charging current flowing through the common line and the phase of the power supply voltage. That is, any deterioration state of the capacitors 4a and 4b can be determined.

  For this reason, in the present embodiment, the A / D converter 62 determines the + peak phase (point A) of the power supply voltage substantially synchronized with the peak phase of the charging current of the capacitor 4a and the charging current of the capacitor 4b. The currents (Ic1_max, Ic2_max) flowing through the common line are detected at the −peak phase (point B) of the power supply voltage substantially synchronized with the peak phase.

  Here, point A is the + peak phase at which the power supply voltage is maximized, and is a quarter of the power cycle from zero cross 1 (T1 = 5 ms when the power supply frequency is 50 Hz), and point B is The power supply voltage becomes the minimum—the peak phase, which is 3/4 of the power supply cycle after the zero cross 1 (T2 = 15 ms when the power supply frequency is 50 Hz).

  Next, when the value (absolute value) of the charging current Ic1_max detected when the power supply voltage is in the positive phase is smaller than a predetermined deterioration determination level Ic_ref set in advance, the deterioration determination unit 7 indicates that the deterioration state of the capacitor 4a is abnormal. It is judged that. Similarly, when the value of the charging current Ic2_max detected in the negative phase of the power supply voltage is smaller than a predetermined deterioration determination level Ic_ref set in advance, it is determined that the deterioration state of the capacitor 4b is abnormal.

  That is, as shown in FIG. 12, when both the capacitors 4a and 4b have normal capacitance, the charging current Ic flowing in the common line in both the positive phase and the negative phase is Ic_ref> Ic, and the deterioration is caused. The judging means 7 judges that the deterioration state is normal. On the other hand, as shown in FIG. 13, when the capacitance of the capacitor 4b is normal but the capacitance of the capacitor 4a is reduced, Ic1_max (absolute value) becomes small, and Ic_ref> Ic1_max, and the deterioration determining means 7 Determines that the deterioration state of the capacitor 4a is abnormal. Then, Ic2_max is large and Ic_ref <Ic2_max, and the deterioration determination unit 7 determines that the deterioration state of the capacitor 4b is normal. Similarly, it can be determined whether the capacitor 4a is normal and the capacitor 4b is abnormal, or whether both the capacitors 4a and 4b are abnormal.

  The deterioration determination level Ic_ref varies depending on the capacitor, and also varies depending on the load 5 and its operating state. Therefore, it is preferable to set the deterioration determination level Ic_ref based on an experimental value obtained by measuring an actual change amount when the deterioration occurs.

  Thereafter, the operation after determining the deterioration state is the same as that in the first embodiment.

  As described above, in the present embodiment, similarly to the first embodiment, it is possible to accurately detect the deterioration state abnormality, to reduce the manufacturing cost and the mounting area, and to achieve an inexpensive configuration. can do.

  In addition to the effect of the sixth embodiment, in the seventh embodiment, the charging current flowing through the common line of the double wave voltage doubler rectifier circuit is detected, and the capacitors 4a and 4b are deteriorated in accordance with the phase of the power supply voltage. Since the abnormality of the state is determined, it is not necessary to provide a current detector for each capacitor in the double wave voltage doubler rectifier circuit, and it is possible to determine the deterioration abnormality with a simpler and less expensive configuration.

Embodiment 8 FIG.
In the eighth embodiment, a case where a capacitor deterioration detection device is mounted on, for example, a washing machine as a home appliance will be described. Hereinafter, an embodiment in which the capacitor deterioration detecting device of the seventh embodiment is mounted will be described for the eighth embodiment. The same parts as those in the seventh embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 14 is a schematic configuration diagram of a washing machine including the capacitor deterioration detection device according to the eighth embodiment. In FIG. 14, the washing machine according to the present embodiment includes an outer frame 101 of the washing machine, a water supply valve 102 for supplying water for washing and rinsing, and is attached to the upper surface of the washing machine main body and opens and closes when the laundry is taken in and out. A lid 103, a plurality of support rods and vibration-proof springs, which are supported by the outer frame 101, are attached to the outer tub 104 for collecting water during the washing or dehydration process, and an inner tub 106 which is attached to the outer tub 104 and rotates freely. Clutch / rotation stop device 110 having a function of transmitting driving force to the tub 106 and intermittent clutch function, and a function of stopping the rotation of the inner tub 106 during washing, and a pulley attached to the rotation shaft of the clutch / rotation stop device 110 111a, an electric motor 30 controlled by an inverter circuit 90 (described later), a pulley 111b attached to a rotating shaft of the electric motor 30, and a pulley 111a and a pulley Necessary for the motor 30 and other washing machines, including a belt 112 attached between the belts 111b, a stirring blade 105 attached to the rotating shaft of the clutch / rotation prevention device 110, a drain valve 107, a washing machine operation unit, and a display unit. The controller 108 for driving a simple actuator or the like. Other parts necessary for the washing machine are omitted and not shown.

  FIG. 15 is a block diagram of a capacitor deterioration detection apparatus according to the eighth embodiment. In FIG. 15, as in the seventh embodiment (FIG. 11), diodes 3a to 3d and capacitors 4a and 4b constitute a double wave voltage rectifier circuit. Then, the inverter circuit 90 that converts the output voltage of the double wave voltage doubler rectifier circuit into an alternating current of an arbitrary frequency and voltage, the control means 20 that drives and controls the inverter circuit 90, and the output of the inverter circuit 90 are connected. And an electric motor 30 composed of an electric motor or the like. The control means 20 and the inverter circuit 90 correspond to drive control means in the present invention.

  Inverter circuit 90 includes switching elements 9a to 9f and anti-parallel connected rectifying elements connected in series vertically to form an arm, and each arm is between a positive electrode and a negative electrode of a double voltage rectifier circuit that is a DC power source. Connected in parallel. The control means 20 generates an inverter drive signal when an operation command is input from the controller 108 of the washing machine. The inverter circuit 90 drives the switching elements 9a to 9f by the generated inverter drive signal, converts the output voltage of the double wave voltage doubler rectifier circuit into AC power having an arbitrary frequency and voltage, and outputs the AC power. Drive.

  In such a configuration, the capacitor deterioration detecting device in the present embodiment detects the charging current Ic flowing through the common line of the double wave voltage doubler rectifier circuit, and the capacitors 4a and 4b are in accordance with the operating state of the motor 30. It detects deterioration. Hereinafter, the operation in the eighth embodiment will be described.

First, the operation of a general washing machine will be described.
In the “washing process”, laundry and detergent are put into the inner tub 106, and then the water supply valve 102 is opened to store a predetermined amount of tap water in the outer tub 104. By closing the water supply valve 102 and rotating the electric motor 30, the driving force is transmitted to the agitating blade 105 via the pulley 111 b, the belt 112, the pulley 111 a, and the clutch / non-rotating device 110 to rotate. As the electric motor 30 rotates forward and backward, the stirring blade 105 also repeats forward and backward rotation, and the water and the laundry in the inner tub 106 are stirred. After the stirring blade 105 is rotated forward and backward for a predetermined time, the operation of the stirring blade 105 is stopped, the drain valve 107 is opened, and the water in the outer tub 104 is discharged to the outside of the main body by the drain hose. After draining is completed, the drain valve 107 is closed and the washing process is terminated.

  In the “rinsing process”, the water supply valve 102 is opened and a predetermined amount of tap water is stored in the outer tub 104. The water supply valve 102 is closed, the electric motor 30 is rotated, the driving force is transmitted to the stirring blade 105 via the pulley 111b, the belt 112, the pulley 111a, and the clutch / rotation prevention device 110, and the stirring blade 105 rotates. As the electric motor 30 rotates forward and backward, the stirring blade 105 also repeats forward and backward rotation, and the water and the laundry in the inner tub 106 are stirred. After the stirring blade 105 is rotated forward and backward for a predetermined time, the operation of the stirring blade 105 is stopped, the drain valve 107 is opened, and the water in the outer tub 104 is discharged to the outside of the main body by the drain hose. After the drainage is completed, the drain valve 107 is closed to end the rinsing process.

  In the “dehydration process”, the drain valve 107 is opened and the clutch / rotation stop device 110 is operated. The electric motor 30 is rotated, the driving force is transmitted to the inner tank 106 through the pulley 111b, the belt 112, the pulley 111a, and the clutch / rotation prevention device 110, and the inner tank 106 rotates. By rotating the inner tub 106 at a high speed, water contained in the laundry is blown into the outer tub 104 by centrifugal force. This water is discharged to the outside of the main body via the drain valve 107 and the drain hose. After a predetermined time has elapsed, the motor 30 is braked by electric braking to stop the inner tank 106 that rotates at a high speed.

  A series of operations and driving of the electric motor 30 in each process described above are operated by the controller 108. Further, the washing process, the rinsing process, and the dehydrating process are performed a plurality of times depending on the degree of dirt and the setting of the user.

  In each operation of the washing machine as described above, the magnitude and peak phase of the charging current of the double voltage rectifier circuit change according to the operating state of the electric motor 30. That is, if the load current is large, the discharged current is large and the charging current of the capacitor also increases, and the peak phase of the charging current varies due to the variation of the power factor of the load.

  For this reason, in the capacitor deterioration detection device according to the present embodiment, the deterioration determination unit 7 has a plurality of deterioration determination levels corresponding to the operating state of the load, and the current detection unit 6 detects the current. An operation state of the load is detected, and an abnormality in the deterioration state is determined using a deterioration determination level corresponding to the operation state among a plurality of deterioration determination levels. Details of such an operation will be described next.

  The deterioration determination means 7 includes, for example, deterioration determination levels 1 (Ic_ref1) corresponding to the “washing process” and deterioration determination levels 2 (corresponding to the “rinsing process”) as the deterioration determination levels corresponding to the respective operating states of the washing machine. A plurality of deterioration determination levels such as Ic_ref2), deterioration determination level 3 (Ic_ref3) corresponding to “dehydration process”, and deterioration determination level 4 (Ic_ref4) corresponding to operation stop (standby) are preset.

  Each deterioration determination level varies depending on the capacitor and also varies depending on the electric motor 30. Therefore, it is preferable to set the deterioration determination level based on an experimental value obtained by measuring an actual change amount or the like when deterioration occurs.

  The A / D converter 62 of the current detection means 6 is charged with currents Ic1_max and Ic2_max (hereinafter collectively referred to as “Ic_max”) in the + peak phase and the −peak phase of the power supply voltage, as in the seventh embodiment. ) Is detected.

  Next, the deterioration determination means 7 acquires information indicating which process the operational state of the washing machine is (including standby) from the controller 108 of the washing machine. Then, the deterioration determination level corresponding to the operating state of the washing machine is selected from a plurality of preset deterioration determination levels, and the above-described seventh embodiment is used by using this deterioration determination level and the detected Ic_max. By the same operation as, it is determined whether or not the deterioration state of the capacitors 4a and 4b is abnormal.

  For example, when the operating state of the washing machine acquired from the controller 108 is the “rinsing process”, the capacitor 4a is selected when the value of the charging current Ic_max detected in the positive phase is smaller than the deterioration determination level 2 (Ic_ref2). It is determined that the deterioration state of is abnormal. Similarly, when the value of charging current Ic_max detected in the negative phase of the power supply voltage is smaller than deterioration determination level 2 (Ic_ref), it is determined that the deterioration state of capacitor 4b is abnormal.

  Then, the control unit 20 drives the electric motor 30 by controlling the inverter circuit 90 according to the output result of the deterioration determination unit 7. For example, control is performed so that the output of the inverter circuit 90 is cut off and the operation of the electric motor 30 is stopped.

  As described above, in the present embodiment, by mounting a capacitor deterioration detection device in a washing machine as a home appliance, it is possible to accurately realize a capacitor deterioration abnormality with a low-cost configuration. Safe home appliances can be provided by preventing smoke and fire.

  In addition, since multiple deterioration judgment levels are set according to the operating state of home appliances and the deterioration state is determined using the deterioration judgment level corresponding to the operating state, the load to which the discharge current of the capacitor is supplied changes. Even in this case, it is possible to accurately detect the deterioration state abnormality.

  In the eighth embodiment, the case where a plurality of deterioration determination levels are set in advance in the deterioration determination unit 7 has been described. However, the present invention is not limited to this, and the deterioration determination unit 7 is provided for each operating state of the washing machine. In addition, a plurality of deterioration determination levels based on the initial value of the charging current Ic may be set. For example, when the washing machine is operated for the first time after product shipment, the charging current Ic in each process may be acquired, and the deterioration determination level in each process may be generated based on this current value.

  In the eighth embodiment, a washing machine has been described as an example of home appliances. However, the present invention is not limited to this, and a capacitor that repeats charging and discharging at a predetermined cycle and the above-described capacitor deterioration detection device are provided. Any home electrical appliance provided may be used, for example, a hand dryer, an IH cooking heater, a microwave oven, a rice cooker, a display device, or an audio device.

  In the eighth embodiment, the case where the deterioration state is determined based on the charging current Ic flowing through the common line by the same operation as that of the seventh embodiment has been described. By the same operation as 5, the deterioration may be determined by the charge / discharge current flowing through each capacitor.

In the eighth embodiment, the case where the output of the double wave voltage doubler rectifier circuit is supplied to the inverter circuit 90 has been described. However, the present invention is not limited to this and is described in the first to fifth embodiments. The output of the half-wave rectifier circuit may be supplied.
Moreover, although the case where the electric motor 30 was driven by the inverter circuit 90 was demonstrated, this invention is not limited to this, Arbitrary drive control means can be used, for example, a DC motor may be voltage-controlled, The VS motor may be current controlled.

  In the eighth embodiment, the case where the charging current Ic_max is detected in the + peak phase and the −peak phase of the power supply voltage has been described. However, since the charging current peak phase varies depending on the power factor of the load 5, the controller The detection timing of the A / D converter 62 may be set according to the operation state information from 108.

Embodiment 9 FIG.
In the ninth embodiment, a plurality of deterioration determination levels are set according to the accumulated operation time or usage period of the load. Hereinafter, the ninth embodiment will be described focusing on differences from the eighth embodiment. The configuration of the capacitor deterioration detection apparatus in the ninth embodiment is the same as that in the eighth embodiment, and the same parts are denoted by the same reference numerals.

  In the capacitor deterioration detection device according to the present embodiment, the deterioration determination means 7 has a plurality of deterioration determination levels corresponding to the cumulative operation time or usage period of the load, and the load when the current detection means 6 detects the current. The accumulated operation time or use period is detected, and an abnormality in the deterioration state is determined using a deterioration determination level corresponding to the accumulated operation time or use period among the plurality of deterioration determination levels. Details of such an operation will be described next.

  The deterioration determination means 7 includes, for example, a deterioration determination level 1 (Ic_ref1) corresponding to the accumulated operation time or use period of “less than one month” as the deterioration determination level corresponding to the accumulated operation time or use period of the washing machine. A plurality of deterioration determination levels such as a deterioration determination level 2 (Ic_ref2) corresponding to the operation time or use period of “one month or more” are set in advance.

Each deterioration determination level varies depending on the capacitor and also varies depending on the electric motor 30. Therefore, it is preferable to set the deterioration determination level based on an experimental value obtained by measuring an actual change amount or the like when deterioration occurs.
Note that the deterioration judgment level 1 (Ic_ref1) corresponding to “less than 1 month” is set to infinity, for example, and the detection of deterioration abnormality is invalidated when the cumulative operation time or usage period is less than 1 month. Can be.

  The A / D converter 62 of the current detection means 6 is charged with currents Ic1_max and Ic2_max (hereinafter collectively referred to as “Ic_max”) in the + peak phase and the −peak phase of the power supply voltage, as in the seventh embodiment. ) Is detected.

  Next, the deterioration determination means 7 acquires information on the accumulated operation time or usage period of the washing machine from the controller 108 of the washing machine.

Here, the information on the accumulated operation time can be obtained by, for example, providing the controller 108 with a time measuring unit and accumulating the operation time of the washing machine.
The information on the period of use can be obtained by, for example, providing the controller 108 with a calendar function (for example, RTC) and calculating a period from the date of manufacture or operation of the washing machine to the current date.

  Then, the deterioration determination level corresponding to the cumulative operation time or the usage period of the washing machine is selected from the plurality of deterioration determination levels set in advance, and the above-described deterioration determination level and the detected Ic_max are used. It is determined whether or not the deterioration state of the capacitors 4a and 4b is abnormal by the same operation as in the seventh embodiment.

  Then, the control unit 20 drives the electric motor 30 by controlling the inverter circuit 90 according to the output result of the deterioration determination unit 7. For example, control is performed so that the output of the inverter circuit 90 is cut off and the operation of the electric motor 30 is stopped.

  As described above, in the present embodiment, since a plurality of deterioration judgment levels are set according to the accumulated operation time or use period, it is possible to realize detection of a deterioration state abnormality according to the accumulated operation time or use period of the load. it can. Further, the detection of deterioration abnormality can be invalidated according to the accumulated operation time or the usage period, and for example, the influence of initial variation can be avoided. Thereby, it is possible to accurately detect the deterioration state abnormality.

  In addition to the above-described operation, the deterioration determination unit 7 may perform life prediction using the above-described plurality of set deterioration determination levels, and notify the notification unit 8 of information regarding the life. For example, the remaining life information is set for each of the deterioration determination levels, and the notification means 8 is notified of the remaining life information corresponding to the deterioration determination level in which the deterioration abnormality is detected. Thereby, the information regarding the remaining life can be notified to the user.

Embodiment 10 FIG.
In the tenth embodiment, the load operation control method is changed according to the load usage period. Hereinafter, the tenth embodiment will be described focusing on differences from the eighth embodiment. The configuration of the capacitor deterioration detection apparatus in the tenth embodiment is the same as that in the eighth embodiment, and the same parts are denoted by the same reference numerals.

  In the capacitor deterioration detection device according to the present embodiment, deterioration determination means 7 determines whether or not the usage period of the load has passed a predetermined usage period in addition to the operation of the eighth embodiment. Details of such an operation will be described next.

  For example, information on a design standard use period of a washing machine (referred to as a design standard use period defined in Article 32-3 of the Consumer Product Safety Law) is set in advance in the deterioration determining unit 7 as a predetermined use period. The

  The A / D converter 62 of the current detection means 6 is charged with currents Ic1_max and Ic2_max (hereinafter collectively referred to as “Ic_max”) in the + peak phase and the −peak phase of the power supply voltage, as in the seventh embodiment. ) Is detected. Then, the deterioration determining means 7 determines whether or not the deterioration state of the capacitors 4a and 4b is abnormal by the same operation as in the above-described seventh embodiment.

  Furthermore, the deterioration determination means 7 acquires information on the usage period of the washing machine from the controller 108 of the washing machine, and determines whether or not the usage period of the washing machine has passed a predetermined usage period.

  Here, the information on the period of use can be obtained, for example, by providing the controller 108 with a calendar function (for example, RTC) and calculating the period from the date of manufacture of the washing machine or the date of start of operation to the current date. .

  Then, the control unit 20 drives the electric motor 30 by controlling the inverter circuit 90 according to the output result of the deterioration determination unit 7. In addition, the deterioration determination unit 7 causes the notification unit 8 to notify the information regarding the usage period.

For example, when it is determined that the deterioration state is abnormal in a use period shorter than a predetermined use period, the control unit 20 controls the output of the inverter circuit 90 and continues the operation of the electric motor 30 with a weak operation or the like. In addition, the deterioration determination unit 7 causes the notification unit 8 to notify the user that the vehicle is operating in a weak operation or the like or that inspection is necessary.
In addition, for example, when it is determined that the deterioration state is abnormal in a use period longer than a predetermined use period, the control unit 20 controls to stop the operation of the electric motor 30 by cutting off the output of the inverter circuit 90. . In addition, the degradation determination unit 7 causes the notification unit 8 to notify the information that the usage period of the load has exceeded a predetermined usage period.

  At this time, for example, as a warning display based on the Electrical Appliance and Material Safety Law, if the product is used beyond the standard design period of use, it may lead to an accident such as ignition or injury due to aging. You may make it alert | report to the alerting | reporting means 8 that there exists.

  In addition, when the configuration including the opening / closing means for preventing re-operation of the load described in the fifth embodiment is applied, and the deterioration state is determined to be abnormal in the use period longer than the predetermined use period, the washing machine It may be controlled so that the re-operation is disabled.

  As described above, in the present embodiment, since it is determined whether or not the usage period of the load has passed the predetermined usage period, the operation method of the load can be changed according to the usage period. In addition, since the information on the usage period of the load is notified to the notification unit 8, it is possible to notify the user of the usage period and information on safety.

  In the first to tenth embodiments described above, the case of a half-wave rectifier circuit or a double-wave voltage rectifier circuit has been described. It can be applied to a voltage doubler rectifier circuit. Further, the deterioration determination operation of the deterioration determination means 7 in each embodiment can be applied to other circuit configurations. The present invention is not limited to the configuration shown in the above embodiment, and it goes without saying that the present invention includes various modifications thereof.

  In the first to tenth embodiments, the case where the deterioration state of the smoothing capacitor used in the rectifier circuit is determined has been described. However, the present invention is not limited to this and is a capacitor that repeatedly charges and discharges at a predetermined cycle. The charging / discharging current of the capacitor can be detected at a predetermined sampling timing synchronized with the cycle, and an abnormality in the deterioration state of the capacitor can be determined from the detection result.

  In the first to tenth embodiments described above, the current detection unit 6 detects the charge / discharge current of the capacitor 4 every cycle in synchronization with the power supply cycle to determine the deterioration state. However, the present invention is not limited to this, and the current detection and the determination of the deterioration state may be performed, for example, once every several hours or only when the operation of the load 5 is started. Since the period until the capacitor deteriorates is relatively long, the effect described in each embodiment is not impaired even in this way.

  In the first to tenth embodiments, the current detection unit 6 detects the instantaneous value of the current. However, the present invention is not limited to this, and it is only necessary to detect a decrease state of the charging current or the discharging current. An integration value of at least one of the discharge currents may be obtained, and a deterioration determination level corresponding to the integration value may be set.

  In addition, as the current detector 61 demonstrated in the said Embodiment 1-10, arbitrary current detection elements, such as a shunt resistance and a Hall element, can be used. The current detector 61 detects the current using the magnetic flux density and uses an inexpensive Hall element, so that the capacitor deterioration detector can be easily insulated from the power supply system circuit with an inexpensive configuration. can do.

1 is a block configuration diagram of a capacitor deterioration detection device according to Embodiment 1. FIG. It is a figure which shows the capacitor | condenser charging / discharging electric current waveform and power supply voltage waveform at the time of normal which concern on Embodiment 1. FIG. It is a figure which shows the capacitor charging / discharging current waveform at the time of abnormality which concerns on Embodiment 1, and a power supply voltage waveform. It is a block block diagram of the capacitor | condenser degradation detection apparatus which concerns on Embodiment 2. It is a figure which shows the capacitor | condenser charging / discharging electric current waveform and power supply voltage waveform at the time of normal which concern on Embodiment 3. FIG. It is a figure which shows the capacitor charging / discharging electric current waveform and power supply voltage waveform at the time of abnormality which concern on Embodiment 3. FIG. It is a block block diagram of the capacitor | condenser degradation detection apparatus which concerns on Embodiment 4. It is a block block diagram of the capacitor | condenser degradation detection apparatus which concerns on Embodiment 5. It is a block block diagram of the capacitor | condenser degradation detection apparatus which concerns on Embodiment 6. It is a figure which shows the capacitor charging / discharging current waveform and power supply voltage waveform which concern on Embodiment 6. FIG. FIG. 10 is a block configuration diagram of a capacitor deterioration detection device according to a seventh embodiment. It is a figure which shows the capacitor | condenser charging current waveform and power supply voltage waveform at the time of normal which concern on Embodiment 7. FIG. It is a figure which shows the capacitor | condenser charging current waveform at the time of abnormality which concerns on Embodiment 7, and a power supply voltage waveform. It is a schematic block diagram of the washing machine provided with the capacitor | condenser degradation detection apparatus which concerns on Embodiment 8. FIG. 10 is a block configuration diagram of a capacitor deterioration detection device according to an eighth embodiment.

Explanation of symbols

  1 power supply, 3 diode, 3a diode, 3b diode, 3c diode, 3d diode, 4 capacitor, 4a capacitor, 4b capacitor, 5 load, 6 current detection means, 7 deterioration determination means, 8 notification means, 9 drive means, 9a switching Element, 9b switching element, 9c switching element, 9d switching element, 9e switching element, 9f switching element, 10 switching means, 11 storage means, 20 control means, 30 motor, 61 current detector, 61a current detector, 61b current detection 62, A / D converter, 62a A / D converter, 62b A / D converter, 90 inverter circuit, 101 outer frame, 102 water supply valve, 103 lid, 104 outer tank, 105 stirring blade, 106 inner tank, 107 drain valve, 108 control La, 110 clutch / detent device, 111a pulley 111b pulley 112 belt.

Claims (27)

Current detection means for detecting a charging / discharging current of a capacitor that repeats charging / discharging at a predetermined cycle at a predetermined sampling timing synchronized with the cycle;
A capacitor deterioration detection device comprising: a deterioration determination unit that determines an abnormality in a deterioration state of the capacitor from the output of the current detection unit.   2. The capacitor according to claim 1, wherein the current detection unit detects a charge / discharge current of the capacitor a predetermined number of times with a phase difference of a predetermined time in synchronization with a cycle of a power supply supplied to the capacitor. Deterioration detection device. The current detection means detects the charging current of the capacitor at any one of the phases of the charging period of the capacitor,
3. The capacitor deterioration detection device according to claim 1, wherein the deterioration determination unit determines that the deterioration state is abnormal when the detected charging current value is smaller than a predetermined deterioration determination level.   4. The capacitor deterioration detecting device according to claim 3, wherein the current detecting means detects a charging current of the capacitor at a phase of a power supply voltage peak among phases of a charging period of the capacitor. The current detection means detects the discharge current of the capacitor at any one of the phases of the discharge period of the capacitor,
The capacitor deterioration detection device according to claim 1, wherein the deterioration determination unit determines that the deterioration state is abnormal when the detected discharge current value is smaller than a predetermined deterioration determination level.   The capacitor deterioration detection device according to claim 1, wherein the deterioration determination unit is configured to set the predetermined deterioration determination level according to a load supplied with a discharge current of the capacitor. . In the deterioration determination means, a plurality of the deterioration determination levels according to the operating state of the load to which the discharge current of the capacitor is supplied are set in advance,
An operation state of the load at the time of detecting the current is detected, and an abnormality in the deterioration state is determined using a deterioration determination level corresponding to the operation state among the plurality of deterioration determination levels. The capacitor deterioration detection device according to claim 1. The deterioration determination means sets a plurality of deterioration determination levels based on an initial value of the charge / discharge current for each operating state of a load to which the discharge current of the capacitor is supplied,
An operation state of the load at the time of detecting the current is detected, and an abnormality in the deterioration state is determined using a deterioration determination level corresponding to the operation state among the plurality of deterioration determination levels. The capacitor deterioration detection device according to claim 1.   The capacitor deterioration detection device according to claim 7 or 8, wherein the deterioration determination means sets the deterioration determination level according to a no-load state in which the discharge current of the capacitor is not supplied to the load.   10. The capacitor deterioration detection according to claim 1, wherein the deterioration determination unit determines that the deterioration state is abnormal when the deterioration determination level exceeds a predetermined number of times or continuously for a predetermined time. apparatus.   11. The capacitor deterioration detection device according to claim 1, wherein the current detection unit detects a charge / discharge current of a rectifier circuit having a capacitor for smoothing a rectified power supply voltage.   12. The capacitor deterioration detection device according to claim 1, wherein the current detection unit detects a charge / discharge current of a multiple voltage rectifier circuit having a plurality of capacitors for smoothing a rectified power supply voltage. . The current detection means includes
A first capacitor that is supplied with a power supply voltage that is rectified in both waves and is charged when the power supply voltage is in a positive phase; and a second capacitor that is charged when the power supply voltage is in a negative phase; Detect the charging current flowing in the common line of the double voltage rectifier circuit where the electrodes are connected in common,
The deterioration judging means is
Based on the charging current detected in the positive phase of the power supply voltage, determine an abnormality in the deterioration state of the first capacitor,
13. The capacitor deterioration detection device according to claim 1, wherein an abnormality in a deterioration state of the second capacitor is determined based on the charging current detected in a negative phase of the power supply voltage.   The capacitor deterioration detection device according to claim 1, further comprising notification means for notifying information related to the deterioration state determined by the deterioration determination means.   15. The capacitor deterioration detection according to claim 1, further comprising drive means for controlling operation of a load to which a discharge current of the capacitor is supplied in accordance with an output of the deterioration determination means. apparatus.   16. The capacitor deterioration detecting device according to claim 15, wherein the driving unit stops the operation of the load when the deterioration determining unit determines that the deterioration state is abnormal. Storage means for storing the determination result of the deterioration determination means;
The said drive means controls the driving | running | working of the said load according to the determination result of the said deterioration determination means memorize | stored in the said memory | storage means, when starting the driving | operation of the said load. Capacitor deterioration detector.   18. The capacitor deterioration detection device according to claim 17, wherein the driving unit does not start the operation of the load when the determination result stored in the storage unit is abnormal in a deterioration state.   The open / close means for shutting off the power supply to the load to which the discharge current of the capacitor is supplied when the deterioration determination means determines an abnormality in the deterioration state. Capacitor deterioration detection device described in 1.   20. The capacitor deterioration detection device according to claim 19, wherein the opening / closing means uses an opening / closing device that keeps the power supply cut off after the power supply to the load is cut off.   21. The capacitor deterioration detection device according to claim 20, wherein the notification unit displays a predetermined message when the switching unit cuts off power supply to the load. In the deterioration determination means, a plurality of the deterioration determination levels according to the cumulative operation time of the load to which the discharge current of the capacitor is supplied are set in advance,
An accumulated operation time of the load at the time of detecting the current is detected, and an abnormality in the deterioration state is determined using a deterioration determination level corresponding to the accumulated operation time among the plurality of deterioration determination levels. The capacitor deterioration detection device according to any one of claims 1 to 6. In the deterioration determination means, a plurality of the deterioration determination levels according to the usage period of the load to which the discharge current of the capacitor is supplied are set in advance,
A use period of the load at the time of detecting the current is detected, and an abnormality in the deterioration state is determined using a deterioration determination level corresponding to the use period among the plurality of deterioration determination levels. The capacitor deterioration detection device according to claim 1.   15. The deterioration determining unit determines whether or not a usage period of the load has passed a predetermined usage period, and causes the notification unit to notify the information regarding the usage period of the load. Capacitor deterioration detector. The deterioration determining means determines whether or not a usage period of the load has passed a predetermined usage period;
16. The drive unit according to claim 15, wherein when the deterioration determination unit determines that the deterioration state is abnormal and determines that the predetermined usage period has elapsed, the driving unit stops the operation of the load. Capacitor deterioration detection device. A capacitor that repeats charging and discharging at a predetermined cycle; and
A home appliance comprising the capacitor deterioration detection device according to claim 1. A capacitor for smoothing the rectified power supply voltage;
Drive control means to which the discharge current of the capacitor is supplied;
A load driven by the drive control means;
A home appliance comprising the capacitor deterioration detection device according to claim 1.

Images