Test probe of power module
By designing separate probe bodies and shell structures, separate sampling of signals and power is achieved, solving the problem of the Kelvin four-wire method being unapplicable in power module testing and improving test accuracy and safety.
Patent Information
- Application Number
- CN202422768241.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-13
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-11-13
AI Technical Summary
In power module testing, the Kelvin four-wire method cannot be applied because the signal terminals and power terminals cannot be effectively separated, resulting in excessively large voltage drop values and inaccurate monitoring data.
A test probe is designed, including two probe bodies and a shell. The probe bodies are semi-cylinders, symmetrically arranged along the central axis of the shell, and the inclined surfaces contact to form a detection hole. The shell is made of insulating material to achieve separate sampling of signals and power.
By separating signal and power sampling, it meets the requirements of Kelvin four-wire method testing and improves test accuracy and safety.
Smart Images
Figure CN223377435U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power module testing, in particular to a testing probe. Background Art
[0002] Kelvin four-terminal sensing, also known as four-terminal sensing, four-wire sensing, or four-point probing, is an electrical impedance measurement technique that uses separate electrodes for current and voltage detection. Compared to traditional two-terminal sensing (voltammetry), Kelvin four-terminal sensing enables more accurate measurements. Its primary advantage lies in the separation of current and voltage electrodes, which effectively eliminates the effects of wiring and probe contact resistance on measurement results.
[0003] When testing power modules, module voltage drop is a crucial parameter. However, due to layout issues in some packages, signal terminals and power terminals cannot be effectively separated, making the Kelvin four-wire method unsuitable for use. In these cases, the resulting voltage drop value is often excessive, resulting in inaccurate monitoring data. Utility Model Content
[0004] The purpose of this utility model is to provide a test probe for a power module to solve the above technical problems;
[0005] A test probe for a power module, comprising:
[0006] A detection assembly, the detection assembly comprising a first probe body and a second probe body arranged in parallel with the first probe body, the first probe body comprising a first test top and a first output tail, the first test top being provided with a first inclined surface, the second probe body comprising a second test top and a second output tail, the second test top being provided with a second inclined surface, the first inclined surface and the second inclined surface being in contact with each other to form a detection hole;
[0007] The housing is arranged on the outside of the detection component.
[0008] Preferably, the first probe body and the second probe body are both semi-cylinders.
[0009] Preferably, the diameter of the detection hole is larger than the diameter of the PIN pin of the power module to be tested.
[0010] Preferably, the first probe body and the second probe body are symmetrically arranged along the central axis of the housing.
[0011] Preferably, the detection assembly passes through the housing, the first test top and the first output tail extend out of the housing respectively, and the second test top and the second output tail extend out of the housing respectively.
[0012] Preferably, the housing is an integrally injection-molded insulating housing.
[0013] Preferably, a side of the first test top close to the housing extends outward to form a first slot.
[0014] Preferably, a side of the second test top close to the housing extends outward to form a second slot.
[0015] Preferably, the first inclined surface and the second inclined surface are both wrapped inclined surfaces.
[0016] Preferably, the first output tail and the second output tail are both connected to a machine sampling port.
[0017] The beneficial effect of the present invention is that: due to the adoption of the above technical solution, sampling is performed separately through the two probe bodies, thereby meeting the Kelvin four-wire method test requirements and improving the test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a cross-sectional view of the test probe of the present utility model;
[0019] Figure 2 It is a side view of the test probe of the present utility model;
[0020] Figure 3 This is a front view of the test probe of the present utility model;
[0021] Figure 4 It is a cross-sectional view of the first probe body of the present utility model;
[0022] Figure 5 This is a cross-sectional view of the test probe of the utility model during testing;
[0023] Figure 6 This is a side view of the test probe of the utility model during testing;
[0024] Figure 7 This is the main view of the test probe of the utility model during testing;
[0025] Figure 8 This is a cross-sectional view of the first probe body of the present utility model during testing.
[0026] In the accompanying drawings: 1. detection assembly; 11. first probe body; 111. first test top; 112. first output tail; 113. first bevel; 12. second probe body; 121. second test top; 122. second output tail; 123. second bevel; 2. housing; 3. PIN pin; 4. first card slot; 5. second card slot. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.
[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.
[0030] A test probe for a power module, such as Figures 1 to 4 Shown, including,
[0031] The detection assembly 1 includes a first probe body 11 and a second probe body 12 arranged in parallel with the first probe body 11. The first probe body 11 includes a first test top 111 and a first output tail 112. The first test top 111 is provided with a first inclined surface 113. The second probe body 12 includes a second test top 121 and a second output tail 122. The second test top 121 is provided with a second inclined surface 123. The first inclined surface 113 and the second inclined surface 123 contact each other to form a detection hole.
[0032] The housing 2 is arranged on the outside of the detection component 1 .
[0033] Specifically, the present invention provides a test probe for a power module, which uses a first probe body 11 and a second probe body 12 to measure the power terminal and the signal terminal respectively. This separate packaging provides feasibility for Kelvin testing, and the Kelvin four-wire method test can be completed on one test probe to ensure the test accuracy of the power module.
[0034] In a preferred embodiment, the first probe body 11 and the second probe body 12 are both semi-cylinders;
[0035] The first probe body 11 and the second probe body 12 are symmetrically arranged along the central axis of the housing 2;
[0036] The first inclined surface 113 and the second inclined surface 123 are both wrapped inclined surfaces.
[0037] Specifically, refer to Figures 5 to 8The symmetrical arrangement of two semi-cylinders effectively separates signal sampling from power sampling, enabling separate sampling of signal and power on a single pin 3, meeting the requirements of Kelvin four-wire testing and significantly improving test accuracy. The probe hole formed by two wrapped, beveled contacts ensures better contact with pin 3 during testing, increasing the contact area and allowing for greater current flow, improving test capability and safety.
[0038] In a preferred embodiment, the diameter of the detection hole is larger than the diameter of the PIN needle 3 of the power module to be tested.
[0039] Specifically, during testing, the detection hole is adapted to the test end of the PIN pin 3 of the power module, and can better contact the test end of the PIN pin 3, thereby improving test safety.
[0040] In a preferred embodiment, the detection assembly 1 passes through the housing 2, the first test top 111 and the first output tail 112 extend out of the housing 2, and the second test top 121 and the second output tail 122 extend out of the housing 2.
[0041] The housing 2 is an integrally injection-molded insulating housing.
[0042] Specifically, the periphery of the probe body is wrapped and covered by an injection-molded insulating shell, which perfectly separates the signal sampling end and the power sampling end, thereby improving the accuracy of the test.
[0043] In a preferred embodiment, the first test top 111 extends outward from one side close to the housing 2 to form a first slot 4;
[0044] A side of the second testing top 121 close to the housing 2 extends outward to form a second slot 5 .
[0045] Specifically, a slot extending from the probe body is left at the connection between the probe body and the housing 2, close to the test end, which helps to strengthen the connection with the housing 2 and improve the service life of the probe.
[0046] In a preferred embodiment, the first output tail 112 and the second output tail 122 are both connected to a machine sampling port.
[0047] Specifically, during testing, the first test top 111 is in test contact with the PIN needle 3 , and the first output tail 112 is connected to the sampling port of the machine, so as to complete sampling.
[0048] The above description is only a preferred embodiment of the present invention and does not limit the implementation method and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.
Claims
1. A test probe for a power module, characterized in that: include, A detection assembly, the detection assembly comprising a first probe body and a second probe body arranged in parallel with the first probe body, the first probe body comprising a first test top and a first output tail, the first test top being provided with a first inclined surface, the second probe body comprising a second test top and a second output tail, the second test top being provided with a second inclined surface, the first inclined surface and the second inclined surface being in contact with each other to form a detection hole; The housing is arranged on the outside of the detection component.
2. The test probe for a power module according to claim 1, characterized in that: The first probe body and the second probe body are both semi-cylinders.
3. The test probe for a power module according to claim 1, wherein: The diameter of the detection hole is larger than the diameter of the PIN needle of the power module to be tested.
4. The test probe for a power module according to claim 1, wherein: The first probe body and the second probe body are symmetrically arranged along the central axis of the housing.
5. The test probe for a power module according to claim 1, wherein: The detection assembly passes through the housing, the first test top and the first output tail extend out of the housing respectively, and the second test top and the second output tail extend out of the housing respectively.
6. The test probe for a power module according to claim 1, wherein: The shell is an integrally-injected insulating shell.
7. The test probe for a power module according to claim 1, characterized in that: A side of the first test top close to the housing extends outward to form a first slot.
8. The test probe for a power module according to claim 1, wherein: A side of the second test top close to the housing extends outward to form a second slot.
9. The test probe for a power module according to claim 1, characterized in that: The first inclined surface and the second inclined surface are both wrapped inclined surfaces.
10. The test probe for a power module according to claim 1, wherein: The first output tail and the second output tail are both connected to a machine sampling port.