Ripple current tolerance testing device for ceramic capacitor

Abstract

A ripple current tolerance testing device for a ceramic capacitor comprises a testing seat, a testing cavity which is arranged on the testing seat and extends downwards, a clamp which is arranged in the testing cavity and is used for installing the ceramic capacitor, and a temperature detection mechanism which is arranged in the testing cavity and is used for detecting the temperature of the ceramic capacitor. The clamp comprises a mounting seat, a mounting groove which is arranged in the mounting seat and is used for placing the ceramic capacitor, a first pole piece which is arranged on the mounting seat and is connected with an electrode at one end part of the ceramic capacitor, and a second pole piece which is arranged on the mounting seat and is connected with an electrode at the other end part of the ceramic capacitor; according to the invention, the structure of the withstand ripple current testing device is limited, the specific clamp is arranged to install and fix the ceramic capacitor, and the temperature detection mechanism is cooperated to detect the temperature change of the ceramic capacitor in the detection process so as to effectively determine the withstand ripple current value of the ceramic capacitor, and the whole structure is simple and operation is convenient.

Description

Technical Field

[0001] The utility model belongs to the field of ceramic capacitor performance testing, and in particular relates to a ceramic capacitor ripple current tolerance testing device. Background Art

[0002] With the development of science and technology, the demand for high-power capacitors in fields such as power supply, industry, automobile, military and aerospace is increasing, which requires products with higher ripple current resistance characteristics. At present, there is no relevant fixture for the ripple current resistance test of ceramic capacitors, which needs further improvement. Utility Model Content

[0003] The utility model aims to overcome the shortcomings of the prior art and provide a ceramic capacitor ripple current tolerance testing device.

[0004] The utility model adopts the following technical solutions:

[0005] A device for testing the ripple current tolerance of a ceramic capacitor comprises a test seat, a test cavity extending downwardly from the test seat, a fixture arranged in the test cavity for mounting a ceramic capacitor, and a temperature detection mechanism arranged in the test cavity for detecting the temperature of the ceramic capacitor, wherein the fixture comprises a mounting seat, a mounting groove arranged in the mounting seat for placing the ceramic capacitor, a first pole piece arranged on the mounting seat and connected to an electrode at one end of the ceramic capacitor, and a second pole piece arranged on the mounting seat and connected to an electrode at the other end of the ceramic capacitor.

[0006] Furthermore, the temperature detection mechanism includes a movable seat that can move back and forth relative to the mounting seat and a temperature sensor that can move up and down and is arranged on the movable seat. The movable seat is opposite to the mounting groove, and the temperature sensor can move downward to contact the ceramic capacitor.

[0007] Furthermore, the movable seat includes a movable section movably arranged in the test cavity, an inclined section arranged on the movable section and extending upwardly inclined, and a positioning section arranged at the top of the inclined section and parallel to the top surface of the mounting seat, and the temperature sensor can be moved up and down and arranged on the positioning section.

[0008] Furthermore, the temperature detection mechanism also includes a guide rail arranged in the test cavity and extending along the moving direction of the movable seat, and a guide groove extending upward and cooperating with the guide rail is formed on the bottom surface of the movable seat.

[0009] Furthermore, the first pole piece includes a first connecting section disposed on the outer surface of the mounting seat and connectable to an external power source, and a first contact section connected to the first connecting section and extending into the mounting groove and connectable to an end electrode of the ceramic capacitor.

[0010] Furthermore, two mounting grooves are provided, and two first contact sections are provided, and the two first contact sections are respectively provided in corresponding mounting grooves and connected to the first connecting section.

[0011] Furthermore, the second pole piece includes a second connecting section arranged on the outer surface of the mounting seat and connected to the external power supply, and a second contact section connected to the second connecting section and extending into the mounting groove and connectable to the other end electrode of the ceramic capacitor, and the first contact section and the second contact section are arranged on both sides of the ceramic capacitor relatively.

[0012] Furthermore, the first connecting section and the second connecting section are arranged on the same side of the mounting seat, and the second pole piece also includes an extension section whose one end is connected to the second connecting section and the other end extends along the outer side surface of the mounting seat to connect to the second contact section.

[0013] From the above description of the utility model, it can be seen that compared with the prior art, the beneficial effects of the utility model are: the application limits the structure of the ripple current tolerance test device, sets a specific fixture to install and fix the ceramic capacitor, and cooperates with the temperature detection mechanism to detect the temperature change of the ceramic capacitor during the detection process, so as to effectively determine the ripple current tolerance value of the ceramic capacitor. The overall structure is simple and easy to operate, and has a certain reference value for the operating conditions of the ceramic capacitor, thereby reducing the occurrence of ceramic capacitor failure due to excessive ripple current during use by customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The structure of the utility model is shown in FIG. Figure 1 ;

[0015] Figure 2 The structure of the utility model is shown in FIG. Figure 2 ;

[0016] Figure 3 The structure of the fixture is shown in Figure 1. Figure 1 ;

[0017] Figure 4 The structure of the fixture is shown in Figure 1. Figure 2 ;

[0018] Figure 5 This is the test data diagram of the sample of 25V106;

[0019] In the figure, 1-test seat, 2-test cavity, 3-fixture, 4-temperature detection mechanism, 5-ceramic capacitor, 31-mounting seat, 32-mounting groove, 33-first pole piece, 331-first connecting section, 332-first contact section, 34-second pole piece, 341-second connecting section, 342-second contact section, 343-extension section, 41-moving seat, 42-temperature sensor, 43-moving section, 44-inclined section, 45-positioning section, 46-wire slide rail, 47-wire slide groove, 51-ceramic capacitor body, 52-end electrode. DETAILED DESCRIPTION

[0020] The present invention is further described below through specific implementation methods.

[0021] Reference Figures 1 to 5 As shown, a ceramic capacitor ripple current tolerance test device includes a test seat 1, a test cavity 2 arranged on the test seat 2 and extending downward, a fixture 3 arranged in the test cavity 2 for mounting a ceramic capacitor 5, and a temperature detection mechanism 4 arranged in the test cavity 2 for detecting the temperature of the ceramic capacitor 5. During the test, the fixture 3 requires an external power supply, and through the continuously increasing ripple current value, cooperates with the temperature detection mechanism 4 to test whether the ceramic capacitor 5 is failed; specifically, the ceramic capacitor 5 includes a ceramic capacitor body 51 and two end electrodes 52 arranged relatively at both ends of the ceramic capacitor body 51.

[0022] The fixture 3 includes a mounting base 31, a mounting groove 32 arranged in the mounting base 31 for placing the ceramic capacitor 5, a first pole piece 33 arranged on the mounting base 31 and connected to an electrode at one end of the ceramic capacitor 5, and a second pole piece 34 arranged on the mounting base 31 and connected to an electrode at the other end of the ceramic capacitor 5. During testing, the positive and negative poles of the external power supply are respectively connected to the first pole piece 33 and the second pole piece 34 to apply a ripple current to the ceramic capacitor 5; specifically, two mounting grooves 32 are provided, and the two mounting grooves 32 are arranged in the mounting base 31 at an interval.

[0023] The first pole piece 33 includes a first connecting section 331 disposed on the outer surface of the mounting seat 31 and connectable to an external power source, and a first contact section 332 connected to the first connecting section 331 and extending into the mounting groove 32 and connectable to an end electrode of the ceramic capacitor. Specifically, two first contact sections 332 are disposed, and the two first contact sections 332 are respectively disposed in corresponding mounting grooves 32 and connected to the first connecting section 331.

[0024] The second pole piece 34 includes a second connecting section 341 which is arranged on the outer surface of the mounting seat 31 and connected to the external power supply, and a second contact section 342 which is connected to the second connecting section 341 and extends into the mounting groove 32 and is connected to the electrode at the other end of the ceramic capacitor. Specifically, the first connecting section 331 and the second connecting section 341 are arranged on the same side of the mounting seat 31, and the first contact section 332 and the second contact section 342 are arranged on both sides of the ceramic capacitor 5 opposite to each other. The second pole piece 34 also includes an extension section 343 which is connected to the second connecting section 341 at one end and extends along the outer side surface of the mounting seat 31 at the other end to be connected to the second contact section 342. The extension section 343 extends from an outer side surface of the mounting seat 31 through an adjacent side surface to the opposite outer side surface to realize the connection between the second connecting section 341 and the second contact section 342. By limiting the structure and setting method of the first pole piece 33 and the second pole piece 34, the external power supply can be located on one side of the clamp 3 to realize the connection with the first pole piece 33 and the second pole piece 34 respectively.

[0025] The temperature detection mechanism 4 includes a movable seat 41 that moves back and forth relative to the mounting seat 31 and a temperature sensor 42 that can be moved up and down and is arranged on the movable seat 41. There are two movable seats 41, and the two movable seats 41 are opposite to the two mounting grooves 32 one by one. When the ceramic capacitor 5 is installed, the temperature sensor 42 can move downward to contact with the ceramic capacitor 5 to detect the temperature change of the ceramic capacitor 5 in real time; specifically, the movable seat 41 includes a movable section 43 that is movably arranged in the test cavity 2, an inclined section 44 that is arranged on the movable section 43 and extends upward and obliquely, and a positioning section 45 that is arranged on the top of the inclined section 44 and is parallel to and opposite to the top surface of the mounting seat 31. The temperature sensor 42 can be moved up and down and is arranged on the positioning section 45. By limiting the structure of the movable seat 41, the inclined section 44 that extends obliquely is arranged so that it can be aligned with the mounting cavity 2. The upper ends of the seats 31 are abutted against each other to ensure that the movable seat 41 is stably supported in the test cavity 2; when the ceramic capacitor 5 is installed, the movable seat 41 is moved in a direction away from the fixture 3 to the positioning section 45 to be staggered with the ceramic capacitor 5 to facilitate the installation of the ceramic capacitor 5; when the ceramic capacitor 5 is installed, the movable seat 41 is moved in a direction close to the fixture 3 to the positioning section 45 to be located at the upper end of the ceramic capacitor 5, and the temperature sensor 42 is moved downward to make it contact with the ceramic capacitor body 51; further, the temperature detection mechanism 4 also includes a guide rail 46 arranged in the test cavity 2 and extending along the moving direction of the movable seat 41, and a guide groove 47 extending upward and cooperating with the guide rail 46 is formed on the bottom surface of the movable seat 41, and the movable seat 41 is stably moved in the test cavity 2 through the cooperation of the guide rail 46 and the guide groove 47.

[0026] The test method specifically includes the following steps:

[0027] Step 1, select the ceramic capacitor 5 to be tested, and move the movable seat 41 in a direction away from the fixture 3 so as to be offset from the fixture 3;

[0028] Step 2: Place the ceramic capacitor 5 into the mounting groove 32 so that the electrodes at both ends are in contact with and connected to the first contact section 332 and the second contact section 342 respectively, and are connected to the positive and negative electrodes of the external power source through the first connection section 331 and the second connection section 342;

[0029] Step 3, move the movable seat 41 in a direction close to the fixture 3 so that its positioning section 45 is located above the ceramic capacitor 5, and move the temperature sensor 42 downward so that it is in contact with and connected to the ceramic capacitor body 51;

[0030] Step 4, set the ripple current value, initially input a ripple current of 1A, and keep it for 1 hour, and feedback data from the temperature sensor 42 to determine whether the ceramic capacitor 5 has failed; if it has not failed, increase the ripple current value, apply a ripple current of 2A, and repeat the above operation. If it has not failed, continue to increase the ripple current value, increase by 1A each time, and increase it to the limit value of 15A of the device in sequence;

[0031] Step 5: Analyze and count to confirm the ripple current value of the ceramic capacitor 5.

[0032] Specific test operation:

[0033] A 25V106 sample was selected and tested according to the above test plan. When the current continued to rise to 14A, the surface temperature of the sample remained below 80°C and the sample was in a thermally stable state. When 15A was applied, the surface temperature of the sample continued to rise, eventually causing the product to fail thermally and burn out. The test data is shown in Table 1 below. For the test data chart, see Figure 5 As shown;

[0034] Table 1 25V106 sample test data table

[0035]

[0036] The present application limits the structure of the ripple current tolerance test device, sets a specific fixture 3 to install and fix the ceramic capacitor 5, and cooperates with the temperature detection mechanism 4 to detect the temperature change of the ceramic capacitor 5 during the detection process, so as to effectively determine the ripple current tolerance value of the ceramic capacitor 5. The overall structure is simple and easy to operate, and has a certain reference value for the operating conditions of the ceramic capacitor 5, thereby reducing the occurrence of failure of the ceramic capacitor 5 due to excessive ripple current during use by customers.

[0037] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of implementation of the present invention. That is, equivalent changes and modifications made according to the scope of application of the present invention and the contents of the specification should still fall within the scope covered by the present invention.

Claims

1. A ceramic capacitor ripple current test device, characterized in that: The invention comprises a test seat, a test cavity extending downward from the test seat, a fixture arranged in the test cavity for mounting a ceramic capacitor, and a temperature detection mechanism arranged in the test cavity for detecting the temperature of the ceramic capacitor. The fixture comprises a mounting seat, a mounting groove arranged in the mounting seat for placing the ceramic capacitor, a first pole piece arranged on the mounting seat and connected to an electrode at one end of the ceramic capacitor, and a second pole piece arranged on the mounting seat and connected to an electrode at the other end of the ceramic capacitor.

2. A ceramic capacitor ripple current test device according to claim 1, characterized in that: The temperature detection mechanism includes a movable seat that can move back and forth relative to the mounting seat and a temperature sensor that can move up and down and is arranged on the movable seat. The movable seat is opposite to the mounting groove, and the temperature sensor can move downward to contact the ceramic capacitor.

3. A ceramic capacitor ripple current test device according to claim 2, characterized in that: The movable seat comprises a movable section movably arranged in the test cavity, an inclined section arranged on the movable section and extending upwardly inclined, and a positioning section arranged on the top of the inclined section and parallel to the top surface of the mounting seat. The temperature sensor is movably arranged on the positioning section.

4. A ceramic capacitor ripple current test device according to claim 2, characterized in that: The temperature detection mechanism also includes a guide rail arranged in the test cavity and extending along the moving direction of the movable seat. The bottom surface of the movable seat is formed with a guide groove extending upward and cooperating with the guide rail.

5. The ceramic capacitor ripple current test device according to claim 1, characterized in that: The first pole piece includes a first connecting section disposed on the outer surface of the mounting seat and connectable to an external power source, and a first contact section connected to the first connecting section and extending into the mounting groove and connectable to an end electrode of the ceramic capacitor.

6. A ceramic capacitor ripple current test device according to claim 5, characterized in that: There are two mounting grooves, and there are two first contact sections. The two first contact sections are respectively arranged in corresponding mounting grooves and connected to the first connecting section.

7. The ceramic capacitor ripple current test device according to claim 5, characterized in that: The second pole piece includes a second connecting section arranged on the outer surface of the mounting seat and connected to the external power supply, and a second contact section connected to the second connecting section and extending into the mounting groove and connected to the other end electrode of the ceramic capacitor. The first contact section and the second contact section are arranged on both sides of the ceramic capacitor opposite to each other.

8. The device for testing the ripple current of a ceramic capacitor according to claim 7, characterized in that: The first connecting section and the second connecting section are arranged on the same side of the mounting seat, and the second pole piece further comprises an extension section having one end connected to the second connecting section and the other end extending along the outer side surface of the mounting seat to be connected to the second contact section.

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