CN111174936A - Capacitor temperature measuring device - Google Patents
Capacitor temperature measuring device Download PDFInfo
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- CN111174936A CN111174936A CN201911086447.4A CN201911086447A CN111174936A CN 111174936 A CN111174936 A CN 111174936A CN 201911086447 A CN201911086447 A CN 201911086447A CN 111174936 A CN111174936 A CN 111174936A
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention provides a capacitor temperature measuring device, comprising: a pattern temperature detection unit that detects, as a detection temperature, a temperature of a conductive pattern of a substrate to which at least one terminal of a capacitor is connected or an ambient temperature of the conductive pattern, by a temperature sensor; a difference value data storage unit that stores a difference value or a difference ratio between the detected temperature and an internal temperature increase value inside the capacitor; and a capacitor internal temperature calculation unit configured to correct the detected temperature based on the difference value data stored in the difference value data storage unit, thereby obtaining a temperature regarded as internal temperature of the capacitor.
Description
The present application is based on the japanese patent application 2018-212946 filed on 2018, 11/13/day to the office of the present patent, enjoying the priority of the application. This application is incorporated by reference in its entirety.
Technical Field
The present invention relates to a capacitor temperature measuring device.
Background
For example, a smoothing electrolytic capacitor of a main circuit power supply is provided as a life-time component in the servo amplifier.
For example, the lifetime of the capacitor depends on the temperature rise value inside the capacitor according to the usage environment (ambient temperature) and the operating state of the servomotor.
Conventionally, the lifetime of a capacitor is estimated, for example, as follows. The ripple current of the capacitor is estimated based on the operating speed of the servo motor, the output power value obtained from the current and voltage supplied to the servo motor, and the system impedance. A temperature rise value in the capacitor is calculated based on the estimated ripple current value. The life of the capacitor is estimated based on the temperature rise value.
Disclosure of Invention
The invention provides a capacitor temperature measuring device, comprising: a pattern temperature detection unit that detects, as a detection temperature, a temperature of a conductive pattern of a substrate to which at least one terminal of a capacitor is connected or an ambient temperature of the conductive pattern, by a temperature sensor; a difference value data storage unit that stores a difference value or a difference ratio between the detected temperature and an internal temperature increase value inside the capacitor; and a capacitor internal temperature calculation unit configured to correct the detected temperature based on the difference value data stored in the difference value data storage unit, thereby obtaining a temperature regarded as internal temperature of the capacitor.
Drawings
Fig. 1 is a schematic diagram illustrating the principle of measuring the internal temperature of an electrolytic capacitor according to an embodiment of the present invention.
Fig. 2 is a functional block diagram of an internal temperature measurement processing unit of the electrolytic capacitor according to the present embodiment.
Fig. 3 is a diagram showing a principle of converting temperature matching time prepared in advance into data in the calculation process of the internal temperature of the capacitor.
Fig. 4 is a flowchart showing an example of the flow of the process of determining the internal temperature of the electrolytic capacitor according to the present embodiment.
Fig. 5 is a timing chart showing an example of the temperature calculation procedure (step).
Detailed Description
In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing.
In the technique described in international patent publication No. 2013/183118, the ripple current of the electrolytic capacitor is calculated favorably because the internal temperature increase value of the electrolytic capacitor is estimated.
In the calculation of the ripple current, a plurality of pieces of information are acquired and complicated calculation is required, and thus the processing becomes complicated. Thus, for example, a high-speed processor and a high-precision sensor are used.
An object of the present invention is to obtain the internal temperature of a capacitor with high accuracy and in a simple manner.
A capacitor temperature measuring device according to an aspect of the present invention (the present capacitor temperature measuring device) includes:
a pattern temperature detection unit that detects, as a detection temperature, a temperature of a conductive pattern of a substrate to which at least one terminal of a capacitor is connected or an ambient temperature of the conductive pattern, by a temperature sensor;
a difference value data storage unit that stores a difference value or a difference ratio between the detected temperature and an internal temperature increase value inside the capacitor; and
and a capacitor internal temperature calculation unit configured to correct the detected temperature based on the difference value data stored in the difference value data storage unit, thereby obtaining a temperature regarded as the temperature inside the capacitor.
The capacitor temperature measuring device may be mounted on a motor driving device that smoothes a current by the capacitor to drive a motor, and the capacitor temperature measuring device may further include: a motor state determination unit that determines an operation state of the motor; and a reference temperature storage unit that stores a reference temperature that is a reference for calculating the temperature of the capacitor interior, wherein when the motor state determination unit determines that the motor has started operating, the capacitor interior temperature calculation unit may calculate a temperature increase value of the capacitor by subtracting the reference temperature from the detected temperature, may calculate a calculated temperature based on the reference temperature, the temperature increase value, the detected temperature, and the difference value data, and may set the calculated temperature as the temperature of the capacitor interior.
In the capacitor temperature measuring device according to the present invention, the capacitor temperature measuring device may further include a temperature matching time storage unit that stores a time from when the operation of the motor is stopped until the capacitor internal temperature matches the detected temperature, and the capacitor internal temperature calculating unit may calculate an elapsed time from when the operation of the motor is stopped when the motor state determining unit determines that the motor is not operating, may set the detected temperature as the reference temperature and the capacitor internal temperature as the temperature when the elapsed time passes the temperature matching time, or may set the calculated temperature as the capacitor internal temperature when the elapsed time does not pass the temperature matching time.
According to an aspect of the present invention, the internal temperature of the electrolytic capacitor can be determined with high accuracy and in a simple manner.
In the present specification, the true (actually measured) internal temperature of the electrolytic capacitor and the internal temperature of the electrolytic capacitor estimated by calculation are described as being distinguished from each other. That is, the internal temperature of the electrolytic capacitor, which is not directly measured but calculated as an estimated value, is referred to as "electrolytic capacitor internal temperature", and is distinguished from the actual internal temperature of the electrolytic capacitor.
The ambient temperature is an ambient temperature around the capacitor.
The reference temperature is a temperature that is a reference for calculating a temperature that is considered to be inside the electrolytic capacitor. The reference temperature is updated at any time depending on the operating condition of the motor and the like.
Hereinafter, an internal temperature measurement technique of an electrolytic capacitor according to an embodiment of the present invention will be described in detail with reference to the drawings.
Fig. 1 is a schematic diagram illustrating the principle of measuring the internal temperature of an electrolytic capacitor according to an embodiment of the present invention. As shown in fig. 1, the electrolytic capacitor 1 is mounted on a substrate. For example, the electrolytic capacitor 1 in the mounting structure a is mounted on one surface of the printed circuit board 3. On the other surface of the printed circuit board 3, a 1 st substrate pattern 5a and a 2 nd substrate pattern 5b are provided as conductive patterns. The 2 nd substrate pattern 5b is electrically and physically separated from the 1 st substrate pattern 5 a.
The 1 st substrate pattern 5a is electrically connected to an electrolytic capacitor terminal 1a extending from the electrolytic capacitor 1. The 2 nd substrate pattern 5b is electrically connected to an electrolytic capacitor terminal 1b extending from the electrolytic capacitor 1. For example, a 1 st temperature sensor 7a is provided on the 1 st substrate pattern 5 a. For example, a 2 nd temperature sensor 7b is provided on the 2 nd substrate pattern 5 b.
According to the above configuration, the ambient temperature (hereinafter referred to as "detection temperature") of the substrate pattern 5a near the electrolytic capacitor terminal 1a and the substrate pattern 5b near the electrolytic capacitor terminal 1b is measured. The internal temperature of the electrolytic capacitor to be determined is determined based on the detected temperature. The internal temperature of the electrolytic capacitor is theoretically the temperature of the center of the element.
In the present embodiment, the temperature sensors are provided at the two terminals, respectively. Instead, a temperature sensor may be attached to one terminal.
The electrolytic capacitor 1 is mounted on a printed circuit board 3. The electrolytic capacitor terminal 1a and the electrolytic capacitor terminal 1b are in contact with the 1 st substrate pattern 5a and the 2 nd substrate pattern 5b, respectively. A metal having high thermal conductivity is used as a member from the inside of the electrolytic capacitor 1 to a position where the temperature is measured by the temperature sensors 7a and 7 b. Therefore, theoretically, the internal temperature of the electrolytic capacitor should be able to be determined with high accuracy based on the temperatures of the electrolytic capacitor terminal 1a and the electrolytic capacitor terminal 1 b.
The inventors paid attention to the fact that a difference value is generated between the internal temperature of the capacitor to be obtained and the detection temperature that can be actually measured due to heat dissipation from the electrolytic capacitor 1, the substrate patterns 5a and 5b, and the like.
[ Table 1]
| Temperature rise (. degree. C.) | Difference value (. degree. C.) |
| 5.0 | 0.5 |
| 10.0 | 1.0 |
| 15.0 | 1.5 |
| 20.0 | 2.0 |
| 25.0 | 2.5 |
Table 1 is a table showing an example of the relationship between the increase in the internal temperature of the electrolytic capacitor due to the operation of the motor and the difference value. As shown in table 1, when the internal temperature of the electrolytic capacitor increases due to the operation of the motor, the difference value (c) changes in accordance with the temperature increase value (c). Further, the magnitude of the differential value depends on the rising value of the internal temperature of the capacitor. The rise value of the internal temperature of the capacitor changes depending on the operating condition of the motor.
In the present embodiment, the internal temperature and the pattern temperature (detection temperature) of the electrolytic capacitor shown in table 1 were measured by a test or the like performed in advance. Thus, the temperature difference (difference value) between the internal temperature of the electrolytic capacitor and the value of the detection temperature that can be actually measured is checked in advance. Then, a difference value (or difference ratio) between the internal temperature of the electrolytic capacitor and the detected temperature is parameterized. By using this difference value (difference ratio) for calculation of the internal temperature of the electrolytic capacitor, the internal temperature of the electrolytic capacitor can be estimated with high accuracy.
Fig. 2 is a functional block diagram of an internal temperature measurement processing unit of the electrolytic capacitor according to the present embodiment. Fig. 2 also shows an example of the basic circuit configuration of the electrolytic capacitor. Accordingly, fig. 2 shows an example of the configuration of a servo amplifier B having a function of measuring the internal temperature of the electrolytic capacitor.
The upper diagram of fig. 2 shows a circuit diagram of a configuration in which the servo motor 8 is driven by an AC power supply 11 such as a 3-phase AC power supply. The lower diagram of fig. 2 shows a functional block diagram of one configuration example of the internal temperature measurement processing unit 21 of the electrolytic capacitor 1. The internal temperature measurement processing unit 21 of the electrolytic capacitor 1 can be realized by software processing using a computer or the like, for example.
In the circuit shown in fig. 2, for example, the 3-phase alternating-current power supply 11 is full-wave rectified by using an AC/DC conversion circuit 15 having a diode 15a, thereby performing direct-current conversion. The dc voltage is smoothed by the electrolytic capacitor 1. For example, the smoothed dc voltage is converted into an ac voltage by an inverter circuit 17 having a transistor 17 a. The servomotor 8 is driven by the converted ac voltage.
To illustrate in more detail, the servo amplifier B has an AC/DC conversion circuit 15, an electrolytic capacitor 1, and an inverter circuit 17. The AC/DC conversion circuit 15 converts AC power of the system power supply into DC power by full-wave rectification, and outputs the DC power between the positive DC bus and the negative DC bus. The electrolytic capacitor 1 is mounted on a substrate, and is smoothed by removing a pulsating component contained in a bus voltage between the positive dc bus and the negative dc bus. The inverter circuit 17 is switched in accordance with a control signal to convert the bus voltage stabilized by the electrolytic capacitor 1 into an ac voltage, thereby generating ac power for driving the servomotor 8.
As shown in fig. 1, the temperatures of the electrolytic capacitor terminals 1a and 1b are measured by a 1 st temperature sensor 7a for measuring the temperature of the electrolytic capacitor terminal 1a of the electrolytic capacitor 1 and a 2 nd temperature sensor 7b for measuring the temperature of the electrolytic capacitor terminal 1 b.
The internal temperature measurement processing unit 21 of the electrolytic capacitor includes a pattern temperature detection unit 21-1, a difference value data storage unit 21-2, a capacitor internal temperature calculation unit 21-3, a motor state determination unit 21-4 for determining the operating state of the servomotor 8, a reference temperature storage unit 21-5 for storing a reference temperature that is a reference for calculating the internal temperature of the capacitor, and a temperature matching time storage unit 21-6.
The pattern temperature detecting unit 21-1 detects the temperatures of the 1 st substrate pattern 5a and the 2 nd substrate pattern 5b by the 1 st temperature sensor 7a and the 2 nd temperature sensor 7 b. Hereinafter, the temperature of the 1 st substrate pattern 5a and the temperature of the 2 nd substrate pattern 5b are set to be the same, and they are collectively referred to as a substrate pattern temperature. The difference value data storage unit 21-2 is, for example, a memory. The difference value data storage unit 21-2 stores a difference value (or difference ratio) between the actual internal temperature of the electrolytic capacitor actually measured in advance after parameterization and the detection temperature that is the measured temperature of the substrate patterns 5a and 5 b.
Hereinafter, the temperature at which the detected temperature (substrate pattern temperature) coincides with the internal temperature of the capacitor is referred to as "reference temperature".
The capacitor internal temperature calculating section 21-3 refers to the on/off state of the servomotor 8 acquired by the motor state determining section 21-4. Then, the capacitor internal temperature calculating section 21-3 calculates a calculated temperature from the substrate pattern temperature calculated by the pattern temperature detecting section 21-1 and the difference value data stored in the difference value data storing section 21-2. Then, the capacitor internal temperature calculation unit 21-3 sets the calculated temperature as the internal temperature of the electrolytic capacitor. That is, the capacitor internal temperature calculation unit 21-3 corrects the detected temperature based on the difference value data, thereby obtaining the capacitor internal temperature.
The reference temperature storage unit 21-5 updates and stores a reference temperature as a temperature equal to a detected temperature at the time of calculation based on the temperature of the capacitor internal temperature calculation unit 21-3 as needed. Further, the internal temperature of the electrolytic capacitor is equal to the ambient temperature immediately before the servomotor 8 starts operating. The reference temperature storage unit 21-5 stores the temperature as a reference temperature. As described later, the temperature coincidence time storage unit 21-6 stores the time required until the pattern temperature coincides with the capacitor internal temperature as the temperature coincidence time.
Fig. 3 is a diagram showing the principle of datamation of the temperature matching time prepared in advance in the calculation process of the internal temperature of the electrolytic capacitor. In fig. 3, the horizontal axis represents elapsed time, and the vertical axis represents temperature. In fig. 3, the pattern temperature (detection temperature) and the internal temperature of the electrolytic capacitor are shown separately.
The procedure of converting the temperature matching time prepared in advance into data is as follows.
1) A difference value data acquisition process is performed to acquire difference value data between the internal temperature of the electrolytic capacitor and the detected temperature. The difference value data storage unit 21-2 records and digitizes the difference value or the difference ratio between the internal temperature and the detected temperature as difference value data.
The difference value data may be recorded in a manner differentiated by a temperature rise state, a temperature saturation state, a temperature decrease state, and the like. When the temperature of the electrolytic capacitor changes abruptly, the detected temperature has a time error. Therefore, by distinguishing the difference value data from the temperature change rate, the internal temperature of the electrolytic capacitor can be calculated with higher accuracy.
2) Temperature coincidence time acquisition
The temperature matching time storage unit 21-6 records and converts the temperature matching time, which is the time from the stop of the operation of the servomotor 8 until the internal temperature of the electrolytic capacitor matches the detected temperature, into data.
As shown in fig. 3, the temperature coincidence time depends on the temperature increase value of the internal temperature of the electrolytic capacitor. When a predetermined time corresponding to the temperature increase value of the internal temperature of the electrolytic capacitor has elapsed, the internal temperature of the electrolytic capacitor and the detected temperature match each other. The temperature coincidence time storage unit 21-6 sets the internal temperature of the electrolytic capacitor and the detected temperature when they coincide with each other as reference temperatures. The time required from the stop of the operation of the servomotor 8 to the time when the internal temperature and the detected temperature reach the reference temperature is recorded as the temperature matching time and digitized. Alternatively, the temperature matching time storage unit 21-6 may be a system in which the time is recorded as a temperature matching time. The temperature-matching-time storage unit 21-6 may also be configured to express and record the time as a quadratic function or the like as a temperature-matching time number.
Fig. 3 exemplarily shows the temperature coincidence time recorded after the digitization. As shown in the figure, temperature coincidence times 1) to 7) are obtained which correspond to the temperature increase values 1) to 7) of the internal temperature of the electrolytic capacitor caused by the operation of the servomotor 8, respectively). This makes it possible to obtain a correspondence relationship between the temperature increase value and the temperature matching time.
The reference temperature shown in fig. 3 depends on the ambient temperature when the servomotor 8 is operating. As described later, when the operation of the servomotor is started, the reference temperature is reset.
Fig. 4 is a flowchart showing an example of the flow of the process of determining the temperature inside the capacitor according to the present embodiment. Fig. 5 is a timing chart showing an example of the temperature calculation procedure (step).
As shown in fig. 4 and 5, when the process STARTs (START), the pattern temperature detection unit 21-1 detects the pattern temperature (detection temperature) in step S1. In the processing, the capacitor internal temperature calculating section 21-3 detects the on/off state of the servomotor 8 acquired from the motor state determining section 21-4.
In step S2, the capacitor internal temperature calculation unit 21-3 determines whether or not the initial processing is finished. When the initial processing is not ended (no), the capacitor internal temperature calculation section 21-3 executes the initial processing. In the initial processing, first, in step S3, the capacitor internal temperature calculation section 21-3 determines whether or not the power is turned on (t of fig. 5)1) Thereafter, the operation of the first servomotor 8 is started (t)2). If yes, the capacitor internal temperature calculation unit 21-3 ends the initial processing in step S4. Thereafter, the process proceeds to step S7 described later. In the case of no, the process proceeds to step S5. In this case, since the servomotor 8 is not operated, no servomotor is generated8, the temperature of the electrolytic capacitor 1 rises. Therefore, the capacitor internal temperature calculation section 21-3 sets the detected temperature as the reference temperature. Thereafter, the process proceeds to step S10 described later.
Referring to FIG. 5, from the measurement start time t0At the beginning, at time t1The power supply (PON) of the device is switched on at time t2The operation of the servomotor is started. In this case, the process shown in fig. 4 proceeds from step S3 through step S4 to step S7.
Here, the reference temperature is a temperature serving as a reference for calculating an increase value of the internal temperature of the capacitor accompanying the operation of the servo motor 8. For example, when fig. 5 is viewed in time series, the reference temperature storage unit 21-5 stores the detected temperature immediately before the servo motor 8 starts operating as the reference temperature 1. The reference temperature 1 (detected temperature) is used for calculation of the rise value.
The initial processing of FIG. 4 is compared to the slave time t in FIG. 50To t2The initial process of the temperature detection flow process up to this point corresponds. The normal processing corresponds to time t in FIG. 52The subsequent normal processing corresponds to.
The capacitor internal temperature calculation unit 21-3 assumes that the pattern temperature (detected temperature) matches the capacitor internal temperature from the power-on to the start of the first operation (initial processing), and sets the detected temperature as the capacitor internal temperature. That is, the detected temperature is equal to the reference temperature 1.
In step S2, when the initial processing ends ("yes"), the processing proceeds to normal processing. First, the process proceeds from step S2 to step S6. In step S6, the capacitor internal temperature calculation unit 21-3 determines whether or not the operation of the servomotor 8 is started. In the case of yes, the process proceeds to step S7 as in the case of transition from step S4.
Then, in step S7, the capacitor internal temperature calculation unit 21-3 obtains the temperature rise value associated with the operation of the servomotor 8 by the following equation (1).
When it is determined that the detected temperature (pattern temperature) -reference temperature (for example, reference temperature 1) is the temperature increase value (1), that is, when it is determined that the servo is performed in step S6When the operation of the motor 8 is started (t in fig. 5)2After the start of the SON state in (c), the process proceeds to step S7. In step S7, the capacitor internal temperature calculation unit 21-3 determines the temperature increase value by subtracting the reference temperature 1 and the like from the detected temperature during the operation (normal processing) after the start of the operation of the servomotor 8. After that, the process proceeds to step S8.
In step S8, the capacitor internal temperature calculation unit 21-3 determines whether or not the temperature increase value is positive (increase value > 0).
If the determination result at step S8 is "no", the process proceeds to step S13, which will be described later.
On the other hand, in a case where the determination result of step S8 is yes, the process proceeds to step S9. In step S9, the capacitor internal temperature calculation unit 21-3 refers to the difference value data (difference value or difference ratio) stored in the difference value data storage unit 21-2 and the reference temperature 1 currently stored in the reference temperature storage unit 21-5. Then, the capacitor internal temperature calculation unit 21-3 obtains the calculated temperature based on the following expression (2) or expression (3).
Alternatively, the first and second electrodes may be,
Then, the process proceeds to step S10. In step S10, the capacitor internal temperature calculation unit 21-3 sets the calculated temperature as the capacitor internal temperature, and ends the processing. When the process proceeds from step S5 or from step S13 described later to step S10, the capacitor internal temperature calculation unit 21-3 regards the detected temperature as the capacitor internal temperature and ends the process.
In the case of no in step S6, the process proceeds to step S11. In step S11, the capacitor internal temperature calculation unit 21-3 obtains a temperature matching time from the temperature rise value based on the data shown in fig. 3 stored in the temperature matching time storage unit 21-6. Here, the capacitor internal temperature calculation unit 21-3 monitors the elapsed time since the operation was stopped.
Next, in step S12, it is determined whether or not the elapsed time from the stop of the operation has elapsed the temperature matching time. If the temperature matching time has not elapsed (no), the process returns to step S7, and the process proceeds to step S7 or less. When the temperature matching time has elapsed (yes), the process proceeds to step S13. In step S13, the capacitor internal temperature calculation unit 21-3 sets the detected temperature as the reference temperature. After that, the process proceeds to step S10.
As described above, in the case of the operation (normal processing) after the start of the operation of the servomotor 8, the capacitor internal temperature calculation unit 21-3 calculates the temperature increase value based ON the reference temperature immediately before SON (servo motor ON) and the detection temperature. Then, the capacitor internal temperature calculation unit 21-3 calculates the capacitor internal temperature by adding or multiplying the reference temperature to or by the rise value calculated using the difference value data (difference value or difference ratio) digitized in advance.
In this way, the capacitor internal temperature calculation unit 21-3 corrects the detected temperature based on the difference value data to obtain the capacitor internal temperature. That is, the capacitor internal temperature calculation unit 21-3 calculates a temperature increase value of the capacitor by subtracting the reference temperature from the detected temperature, calculates a calculated temperature based on the reference temperature, the temperature increase value, the detected temperature, and the difference value data, and regards the calculated temperature as the capacitor internal temperature.
In the case where the operation of the servomotor 8 is stopped (normal processing), the capacitor internal temperature calculating unit 21-3 calculates the capacitor internal temperature by adding or multiplying the reference temperature to or by the increase value calculated using the difference value data (difference value or difference ratio) digitized in advance, as in the case of the operation after the start of the operation of the servomotor 8. However, in the case where the detected temperature is lower than the reference temperature, the capacitor internal temperature calculation section 21-3 sets the detected temperature as the capacitor internal temperature and sets the detected temperature as the reference temperature. Then, the capacitor internal temperature calculation unit 21-3 obtains a temperature matching time from the rise value immediately before the operation stop, and monitors the time since the operation stop.
Then, as to whether or not the temperature matching time has elapsed, the capacitor internal temperature calculation unit 21-3 determines that the internal temperature of the capacitor matches the detected temperature when the temperature matching time obtained by the preliminary data processing has elapsed, sets the detected temperature as the reference temperature, and sets the detected temperature as the electrolytic capacitor internal temperature.
As shown in fig. 5, the reference temperature stored in the reference temperature storage unit 21-5 is a temperature for calculating an increase value of the internal temperature of the capacitor at each time. The value of the reference temperature is updated as needed in accordance with the operating state of the motor and the passage of time. The reference temperature storage unit 21-5 normally starts the operation of the servomotor 8 to t2The detected temperature immediately before is stored as a reference temperature 1. The reference temperature 1 is used for calculation of an increase value (in the case of the reference temperature 1 in fig. 5, etc.). The plurality of pattern temperatures (for example, temperatures indicated by black circles in fig. 5) after a certain time has elapsed after the SOFF (servo OFF) are "reference temperatures", and are represented as reference temperature 1, reference temperature 2, and reference temperature 3, respectively.
After the operation of the servomotor 8 is stopped (> t)3) Within a temperature-consistent time (e.g. from t)3To t5) When the rise value is 0 or less (reference temperature or less) (for example, from t)4To t5) The reference temperature storage unit 21-5 stores the detected temperature as the reference temperature 2. Alternatively, in the case where the temperature coincidence time has elapsed (e.g., t)7After t8Up to this point), the reference temperature storage section 21-5 stores the detected temperature as the reference temperature 3.
As described above, according to the present embodiment, the capacitor lifetime can be estimated with high accuracy by obtaining the capacitor internal temperature with high accuracy. Conventionally, a standard replacement standard is set, and a user is required to replace a capacitor regularly regardless of an operation state. In contrast, according to the present embodiment, appropriate maintenance and preventive maintenance of the capacitor can be performed. Further, it is possible to detect a manufacturing defect of the capacitor based on a rapid change in the internal temperature of the capacitor. Further, it is possible to estimate deterioration of the motor or the device based on a difference from a temperature change in a normal state.
In the above-described embodiments, the illustrated configurations and the like are not limited to these, and can be appropriately modified within the range in which the technical effects of the present invention are exhibited. Alternatively, these configurations and the like may be appropriately modified and implemented without departing from the scope of the object of the present invention. Further, each component of the present invention can be arbitrarily selected. The technique having the selected configuration is also included in the technical scope of the present invention.
The technique of the present embodiment can be used for an internal temperature measuring device of an electrolytic capacitor, for example.
The capacitor temperature measuring device of the present embodiment may be the following 1 st to 3 rd capacitor temperature measuring devices.
The 1 st capacitor temperature measuring device is mounted on a motor driving device that performs dc conversion of ac power and smoothes a current by a capacitor to drive a motor, and is characterized by comprising: a pattern temperature detection unit that detects, as a detection temperature, a temperature of a conductive pattern of a substrate to which at least one terminal of a capacitor is connected or an ambient temperature of the conductive pattern, by a temperature sensor; a difference value data storage unit that stores a difference value or a difference ratio between the detected temperature and an internal temperature increase value inside the capacitor; and a capacitor internal temperature calculation unit configured to correct the detected temperature based on the difference value data stored in the difference value data storage unit, thereby obtaining a temperature regarded as internal temperature of the capacitor.
The 2 nd capacitor temperature measuring device is characterized in that the 1 st capacitor temperature measuring device comprises: a motor state determination unit that determines an operation state of the motor; and a reference temperature storage unit that stores a reference temperature that is a reference for calculating the temperature of the capacitor interior, wherein in the correction of the capacitor interior temperature calculation unit, when the motor state determination unit determines that the motor starts to operate, the reference temperature is subtracted from the detected temperature to obtain a temperature increase value of the capacitor, and the capacitor interior temperature is calculated based on the reference temperature, the temperature increase value, the detected temperature, and the difference value data.
The 3 rd capacitor temperature measuring device is characterized in that the 2 nd capacitor temperature measuring device further comprises a temperature matching time storage part, the temperature matching time storage unit stores a time from stopping the operation of the motor until the internal temperature of the capacitor matches the detected temperature, determining an elapsed time from a stop of the operation of the motor when the motor state determination unit determines that the motor is not operating, setting the detected temperature as the reference temperature and the capacitor interior as a temperature when the elapsed time has elapsed the temperature matching time, when the elapsed time does not elapse the temperature matching time, the temperature obtained by the correction of the detected temperature by the capacitor internal temperature calculation unit is regarded as the capacitor internal temperature.
The detailed description has been presented for purposes of illustration and description. Many modifications and variations are possible in light of the above teaching. The detailed description is not intended to be exhaustive or to limit the subject matter described herein. Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the claims is not necessarily limited to the specific features or acts described. Rather, the specific features and acts described are disclosed as example forms of implementing the claims.
Claims (3)
1. A capacitor temperature measuring device is characterized by comprising:
a pattern temperature detection unit that detects, as a detection temperature, a temperature of a conductive pattern of a substrate to which at least one terminal of a capacitor is connected or an ambient temperature of the conductive pattern, by a temperature sensor;
a difference value data storage unit that stores a difference value or a difference ratio between the detected temperature and an internal temperature increase value inside the capacitor; and
and a capacitor internal temperature calculation unit configured to correct the detected temperature based on the difference value data stored in the difference value data storage unit, thereby obtaining a temperature regarded as the temperature inside the capacitor.
2. The capacitor temperature measuring apparatus according to claim 1,
the capacitor temperature measuring device is mounted on a motor driving device for smoothing a current by the capacitor and driving a motor,
the capacitor temperature measuring device further includes:
a motor state determination unit that determines an operation state of the motor; and
a reference temperature storage unit for storing a reference temperature as a reference for calculating a temperature inside the capacitor,
when the motor state determination unit determines that the motor starts to operate,
the capacitor internal temperature calculation unit calculates a temperature increase value of the capacitor by subtracting the reference temperature from the detected temperature, calculates a calculated temperature based on the reference temperature, the temperature increase value, the detected temperature, and the difference value data, and regards the calculated temperature as the capacitor internal temperature.
3. The capacitor temperature measuring apparatus according to claim 2,
the capacitor temperature measuring device further includes a temperature coincidence time storage unit that stores a time from when the operation of the motor is stopped until the internal temperature of the capacitor coincides with the detected temperature,
the capacitor internal temperature calculation unit obtains an elapsed time from a stop of the operation of the motor when the motor state determination unit determines that the motor is not operating,
the capacitor internal temperature calculation unit regards the detected temperature as the reference temperature and the capacitor internal temperature as a temperature when the elapsed time has elapsed after the temperature matching time,
the capacitor internal temperature calculation unit regards the calculated temperature as the capacitor internal temperature when the elapsed time does not elapse the temperature matching time.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-212946 | 2018-11-13 | ||
| JP2018212946A JP2020079744A (en) | 2018-11-13 | 2018-11-13 | Capacitor temperature measurement device |
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| CN111174936A true CN111174936A (en) | 2020-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911086447.4A Pending CN111174936A (en) | 2018-11-13 | 2019-11-08 | Capacitor temperature measuring device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2020079744A (en) |
| CN (1) | CN111174936A (en) |
| PH (1) | PH12019000426A1 (en) |
| TW (1) | TW202024589A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116398413A (en) * | 2023-06-08 | 2023-07-07 | 深圳艾为电气技术有限公司 | Intelligent power control method and device for electric compressor |
-
2018
- 2018-11-13 JP JP2018212946A patent/JP2020079744A/en active Pending
-
2019
- 2019-11-01 TW TW108139762A patent/TW202024589A/en unknown
- 2019-11-07 PH PH12019000426A patent/PH12019000426A1/en unknown
- 2019-11-08 CN CN201911086447.4A patent/CN111174936A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116398413A (en) * | 2023-06-08 | 2023-07-07 | 深圳艾为电气技术有限公司 | Intelligent power control method and device for electric compressor |
| CN116398413B (en) * | 2023-06-08 | 2023-09-29 | 深圳艾为电气技术有限公司 | Intelligent power control method and device for electric compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2020079744A (en) | 2020-05-28 |
| TW202024589A (en) | 2020-07-01 |
| PH12019000426A1 (en) | 2020-05-27 |
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