Impedance measurement system

Abstract

The present invention provides an impedance measurement system for measuring the impedance between conductive pins of a product. The impedance measurement system includes: a relay board, which includes a plurality of relay groups, each relay group includes a first channel, a second channel, a third channel, and a fourth channel, each of which is electrically connected to a conductive pin of the product and can be independently opened and closed; the relay board also includes a first voltage interface, a second voltage interface, a first current interface, and a second current interface, the first voltage interface is electrically connected to the first channel, the first current interface is electrically connected to the second channel, the second voltage interface is electrically connected to the third channel, and the second current interface is electrically connected to the fourth channel; a measuring instrument for measuring impedance, which is electrically connected to the first voltage interface, the second voltage interface, the first current interface, and the second current interface. The present invention effectively avoids repeatedly switching wiring between different conductive pins when measuring impedance, thereby improving measurement efficiency.

Description

Technical Field

[0001] The present invention relates to the field of impedance measurement, and in particular to an impedance measurement system. Background Art

[0002] When inspecting products for electrical anomalies, open-short circuit testing is often required to verify whether the pin being tested is shorted to other pins or open-circuited. Currently, open-short circuit testing is typically performed using a handheld multimeter to measure the impedance between all pins on the product. Obviously, when a product has multiple pins, the number of required measurements increases, leading to inefficiencies and the risk of misconnections and measurement errors. Summary of the Invention

[0003] In view of this, it is necessary to provide an impedance measurement system to avoid relying on a method of manually switching between different conductive pins frequently to measure impedance.

[0004] An impedance measurement system provided in one embodiment of the present invention is used to measure the impedance between conductive pins of a product. The impedance measurement system includes:

[0005] A relay board, the relay board including a plurality of relay groups, each of the relay groups including a first channel, a second channel, a third channel, and a fourth channel, the first channel, the second channel, the third channel, and the fourth channel being electrically connected to a conductive pin of the product, and the first channel, the second channel, the third channel, and the fourth channel being independently openable and closed, the relay board also including a first voltage interface, a second voltage interface, a first current interface, and a second current interface, the first voltage interface being electrically connected to the first channel, the first current interface being electrically connected to the second channel, the second voltage interface being electrically connected to the third channel, and the second current interface being electrically connected to the fourth channel;

[0006] The measuring instrument is electrically connected to the first voltage interface, the second voltage interface, the first current interface and the second current interface.

[0007] Optionally, each relay group includes an odd-numbered relay and an even-numbered relay, the first channel and the second channel constitute the odd-numbered relays, and the third channel and the fourth channel constitute the even-numbered relays.

[0008] Optionally, the impedance measurement system includes a control unit, which is used to control the opening and closing of the first channel, the second channel, the third channel and the fourth channel of each relay group, and the control unit only opens the odd-numbered relays of one relay group and the even-numbered relays of another relay group at a time, and closes the other odd-numbered relays and the even-numbered relays.

[0009] Optionally, the product includes at least a first conductive pin and a second conductive pin. When impedance measurement is performed between the first conductive pin and the second conductive pin, the control unit switches channels twice. During the first switching, the odd-numbered relays of the relay group electrically connected to the first conductive pin are opened, and the even-numbered relays of the relay group electrically connected to the second conductive pin are opened, while the even-numbered relays electrically connected to the first conductive pin and the odd-numbered relays electrically connected to the second conductive pin are closed. During the second switching, the even-numbered relays of the relay group electrically connected to the first conductive pin are opened, and the odd-numbered relays of the relay group electrically connected to the second conductive pin are opened, while the odd-numbered relays electrically connected to the first conductive pin and the even-numbered relays electrically connected to the second conductive pin are closed.

[0010] Optionally, the number of the conductive pins is n, and the control unit is used to perform n*(n-1) channel switching to obtain n*(n-1) impedance data, where n is a positive integer greater than or equal to 2.

[0011] Optionally, the impedance measurement system further includes a display unit for displaying the tested impedance data.

[0012] Optionally, the impedance measurement system includes an adapter board, which is electrically connected between the relay board and the product. The adapter board has a plurality of pin sockets, each of which is used to accommodate one of the conductive pins of the product, and each of the pin sockets is also electrically connected to the first channel, the second channel, the third channel and the fourth channel.

[0013] Optionally, the impedance measurement system further includes a fixing mechanism for fixing the relay board and the adapter board.

[0014] Optionally, the measuring instrument is an impedance analyzer.

[0015] Optionally, the control unit is a computer.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: by providing a multi-channel relay board, repeated switching of wiring between different conductive pins is effectively avoided, measurement efficiency is improved, and the possibility of measurement errors is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. 4 is a block diagram of an impedance measurement system according to an embodiment of the present invention.

[0018] Figure 2 Schematic diagram of the connection of the adapter board according to the embodiment of the present invention.

[0019] Figure 3 FIG. 4 is another block diagram of an impedance measurement system according to an embodiment of the present invention.

[0020] Figure 4 Schematic diagram of impedance data according to an embodiment of the present invention.

[0021] Description of main component symbols

[0022]

[0023] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0024] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0025] It should be noted that when an element is referred to as being "electrically connected" to another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "electrically connected" to another element, it may be a contact connection, for example, a wire connection, or a contactless connection, for example, a contactless coupling.

[0026] The following description sets forth many specific details to facilitate a full understanding of the present invention. The embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0028] See also Figure 1 The present invention provides an impedance measurement system 1000 for measuring the impedance between conductive pins of a product 300. The impedance measurement system 1000 includes at least: a relay board 100 and a measuring instrument 200.

[0029] The relay board 100 includes a plurality of relay groups 110. Each relay group 110 includes a first channel 121, a second channel 122, a third channel 131, and a fourth channel 132. The relay board 100 also includes a first voltage interface 140, a second voltage interface 160, a first current interface 150, and a second current interface 170. The first voltage interface 140 and the first current interface 150 are positive polarity interfaces, while the second voltage interface 160 and the second current interface 170 are negative polarity interfaces.

[0030] The first voltage interface 140 is electrically connected to the first channel 121 , the first current interface 150 is electrically connected to the second channel 122 , the second voltage interface 160 is electrically connected to the third channel 131 , and the second current interface 170 is electrically connected to the fourth channel 132 .

[0031] The measuring instrument 200 is used to measure impedance. The first voltage interface 140, the second voltage interface 160, the first current interface 150, and the second current interface 170 are all electrically connected to the measuring instrument 200. Specifically, the measuring instrument 200 is an instrument that can measure parameters such as resistance, capacitance, and inductance, such as an impedance analyzer.

[0032] It will be appreciated that, for ease of description, this embodiment uses a product 300 comprising three conductive pins (e.g., a first conductive pin 310, a second conductive pin 320, and a third conductive pin 330) as an example to explain the operating principle of the impedance measurement system 1000 in detail. During actual measurement, the number of relay groups 110 should be greater than or equal to the total number of conductive pins on the product 300.

[0033] During testing, the first conductive pin 310 , the second conductive pin 320 , and the third conductive pin 330 are each electrically connected to one of the relay groups 110 , for example, electrically connected to the first channel 121 , the second channel 122 , the third channel 131 , and the fourth channel 132 of the relay group 110 .

[0034] As can be appreciated, by providing a multi-channel relay group 110 and electrically connecting each relay group 110 to a conductive pin of the product 300, the corresponding conductive pin can be independently controlled to connect to the impedance measurement circuit by opening and closing each channel of the relay group 110. This effectively avoids the need to repeatedly switch connections between different conductive pins of the product 300, improving measurement efficiency and reducing the possibility of measurement errors.

[0035] In this embodiment, each relay group 110 includes odd relays 120 and even relays 130 . The first channel 121 and the second channel 122 constitute the odd relays 120 , and the third channel 131 and the fourth channel 132 constitute the even relays 130 .

[0036] Please continue reading Figure 1 The impedance measurement system 1000 further includes a control unit 500 for controlling the relay board 100 to switch channels. One end of the control unit 500 is electrically connected to the relay board 100, and the other end is electrically connected to the measuring instrument 200. The control unit 500 may be, for example, a computer or industrial personal computer having the aforementioned control functions. During each switching operation, the control unit 500 only controls the opening of the channels of the two relay groups 110 electrically connected to the two conductive pins to be measured, while closing the channels of the other relay groups 110. Furthermore, during each measurement, only the odd-numbered relays 120 of one relay group 110 and the even-numbered relays 130 of the other relay group 110 are opened.

[0037] It is understood that the control unit 500 switches only the channels of the two relay groups 110 electrically connected to the two conductive pins to be measured, while closing the channels of the other relay groups 110. This allows different two conductive pins to be connected to the impedance measurement circuit each time as required. By switching multiple times, the impedance between all two conductive pins can be measured.

[0038] Please continue reading Figure 1When performing impedance measurement between the first conductive pin 310 and the second conductive pin 320, the control unit 500 switches channels twice. During the first switching, the control unit 500 controls the opening of the odd-numbered relays 120 of the relay group 110 electrically connected to the first conductive pin 310 and the opening of the even-numbered relays 130 of the relay group 110 electrically connected to the second conductive pin 320, while closing the even-numbered relays 130 of the relay group 110 electrically connected to the first conductive pin 310 and the odd-numbered relays 120 of the relay group 110 electrically connected to the second conductive pin 320. In this way, the first voltage interface 140, the first channel 121 electrically connected to the first conductive pin 310, the first conductive pin 310, the second conductive pin 320, the third channel 131 electrically connected to the second conductive pin 320, and the second voltage interface 160 form a first circuit for measuring the voltage between the first conductive pin 310 and the second conductive pin 320. Simultaneously, the first current interface 150, the second channel 122 electrically connected to the first conductive pin 310, the first conductive pin 310, the second conductive pin 320, the fourth channel 132 electrically connected to the second conductive pin 320, and the second current interface 170 form a second loop to supply a test current between the first conductive pin 310 and the second conductive pin 320. This test current is provided by the measuring instrument 200. Thus, the impedance between the first conductive pin 310 and the second conductive pin 320 can be calculated based on the voltage measured in the first loop and the test current (dividing the measured voltage by the test current).

[0039] During the second switching, the control unit 500 controls the opening of the even-numbered relays 130 of the relay group 110 electrically connected to the first conductive pin 310, and the opening of the odd-numbered relays 120 of the relay group 110 electrically connected to the second conductive pin 320, while closing the odd-numbered relays 120 of the relay group 110 electrically connected to the first conductive pin 310 and the even-numbered relays 130 of the relay group 110 electrically connected to the second conductive pin 320. In this way, the first voltage interface 140, the first channel 121 electrically connected to the second conductive pin 320, the second conductive pin 320, the first conductive pin 310, the third channel 131 electrically connected to the first conductive pin 310, and the second voltage interface 160 form a first circuit for measuring the voltage between the first conductive pin 310 and the second conductive pin 320. The first current interface 150, the second channel 122 electrically connected to the second conductive pin 320, the second conductive pin 320, the first conductive pin 310, the fourth channel 132 electrically connected to the second conductive pin 320, and the second current interface 170 form a second loop to supply a test current between the first conductive pin 310 and the second conductive pin 320. The test current is provided by the measuring instrument 200. The impedance between the second conductive pin 320 and the first conductive pin 310 can be calculated based on the voltage measured in the first loop and the test current (the measured voltage divided by the test current).

[0040] It can be understood that there is no strict order between the first connection method (circuit connection method for the first switching) and the second connection method (circuit connection method for the second switching). In another embodiment, the order of the two connection methods can be swapped.

[0041] As above, when performing impedance measurement between the first conductive pin 310 and the third conductive pin 330 , the control unit 500 still switches channels twice. The specific process is similar to the impedance measurement between the first conductive pin 310 and the third conductive pin 330 , and will not be repeated here.

[0042] It will be appreciated that if devices such as diodes, transistors, and MOS transistors are located between the two conductive pins, then when measuring impedance, since these devices all have unidirectional conductivity, the impedance values ​​measured by performing the two circuit connections (as shown in the first and second switching steps above) will be different, necessitating two measurements. For example, when measuring the first and second conductive pins 310 and 320, the positive terminal of the measuring instrument 200 is connected to the first conductive pin 310 and the negative terminal to the second conductive pin 320 during the first connection. During the second connection, the positive terminal of the measuring instrument 200 is connected to the second conductive pin 320 and the negative terminal to the first conductive pin 310. It will be appreciated that the order of the two connections can also be reversed. Since the odd-numbered relays 120 of the relay group 110 are electrically connected to the positive terminal (i.e., to the first voltage interface 140 and the first current interface 150), the even-numbered relays 130 of the relay group 110 are electrically connected to the negative terminal (i.e., to the second voltage interface 160 and the second current interface 170). In this way, by turning on and off the odd-numbered relays 120 and the even-numbered relays 130 by the control unit 500, the impedance between every two conductive pins can be measured twice using two different positive and negative connection methods.

[0043] It can be understood that if there is no device such as a diode, a transistor, or a MOS tube between the two conductive pins, then when measuring the impedance, the impedance values ​​measured in the first switching and the second switching are the same.

[0044] See also Figure 2 In one embodiment, the impedance measurement system 1000 further includes an adapter board 400. The adapter board 400 is electrically connected between the relay board 100 and the product 300. The adapter board 400 has a plurality of pin sockets 410. The number of the pin sockets 410 is greater than or equal to the number of conductive pins of the product 300. For example, in this embodiment, the adapter board 400 has three pin sockets 410, which are respectively used to accommodate the first conductive pin 310, the second conductive pin 320, and the third conductive pin 330 of the product 300. Each pin socket 410 is electrically connected to one of the relay groups 110, for example, to the first channel 121, the second channel 122, the third channel 131, and the fourth channel 132 of the relay group 110.

[0045] It can be understood that since each conductive pin of the product 300 needs to be connected to the corresponding first channel 121, second channel 122, third channel 131 and fourth channel 132 at the same time during measurement, the setting of the adapter board 400 makes it possible for each conductive pin to be electrically connected to only one pin socket 410 during measurement, thereby facilitating wiring.

[0046] In this embodiment, the number of the conductive pins is n, and n is a positive integer greater than or equal to 2. The control unit 500 performs n*(n-1) channel switching, and obtains n*(n-1) impedance data after measurement and recording.

[0047] See also Figure 3 In one embodiment, the impedance measurement system 1000 further includes a display unit 600 for displaying the measured impedance data. The display unit 600 is electrically connected to the control unit 500 .

[0048] See also Figure 4 , Figure 4 is a schematic diagram of impedance data measured by the impedance measurement system 1000. The impedance data can be displayed on the display unit 600. Figure 4 As shown, the horizontal axis shows the conductive pin connected to the positive electrode, such as the first voltage interface 140 and the first current interface 150. The vertical axis shows the conductive pin connected to the negative electrode, such as the second voltage interface 160 and the second current interface 170. Since the measurement system measures the impedance between the two conductive pins, it is not necessary to connect the positive and negative electrodes to the same conductive pin. Figure 4 The data on the middle diagonal line is default. By setting the display unit 600, the impedance data can be displayed.

[0049] In one embodiment, the impedance measurement system 1000 further includes a fixing mechanism (not shown) for fixing the relay board 100 and the adapter board 400 so that the relay board 100 is always in a stable state during the impedance measurement process, thereby avoiding measurement errors caused by unstable interface contact.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. An impedance measurement system for measuring the impedance between conductive pins of a product, characterized in that: The impedance measurement system comprises: A relay board, the relay board including a plurality of relay groups, each of the relay groups including a first channel, a second channel, a third channel, and a fourth channel, the first channel, the second channel, the third channel, and the fourth channel being electrically connected to a conductive pin of the product, and the first channel, the second channel, the third channel, and the fourth channel being independently openable and closable. The relay board also includes a first voltage interface, a second voltage interface, a first current interface, and a second current interface, the first voltage interface being electrically connected to the first channel, the first current interface being electrically connected to the second channel, the second voltage interface being electrically connected to the third channel, and the second current interface being electrically connected to the fourth channel, the first voltage interface and the first current interface being positive electrodes, and the second voltage interface and the second current interface being negative electrodes; a measuring instrument electrically connected to the first voltage interface, the second voltage interface, the first current interface, and the second current interface; Each of the relay groups includes odd-numbered relays and even-numbered relays, the first channel and the second channel constitute the odd-numbered relays, and the third channel and the fourth channel constitute the even-numbered relays; The impedance measurement system includes a control unit, and the product includes at least a first conductive pin and a second conductive pin. When impedance measurement is performed between the first conductive pin and the second conductive pin, the control unit switches channels twice. During the first switching, the odd-numbered relays of the relay group electrically connected to the first conductive pin are opened, and the even-numbered relays of the relay group electrically connected to the second conductive pin are opened, while the even-numbered relays electrically connected to the first conductive pin and the odd-numbered relays electrically connected to the second conductive pin are closed. During the second switching, the even-numbered relays of the relay group electrically connected to the first conductive pin are opened, and the odd-numbered relays of the relay group electrically connected to the second conductive pin are opened, while the odd-numbered relays electrically connected to the first conductive pin and the even-numbered relays electrically connected to the second conductive pin are closed.

2. The impedance measurement system according to claim 1, wherein: The control unit is used to control the opening and closing of the first channel, the second channel, the third channel and the fourth channel of each relay group, and the control unit only opens the odd-numbered relays of one relay group and the even-numbered relays of another relay group at a time, and closes the other odd-numbered relays and the even-numbered relays.

3. The impedance measurement system according to claim 1, wherein: The number of the conductive pins is n, and the control unit is used to perform Secondary channel switching to obtain impedance data, where n is a positive integer greater than or equal to 2.

4. The impedance measurement system according to claim 1, wherein: The impedance measurement system further includes a display unit for displaying the tested impedance data.

5. The impedance measurement system according to claim 1, wherein: The impedance measurement system includes an adapter board, which is electrically connected between the relay board and the product. The adapter board has a plurality of pin sockets, each of which is used to accommodate one of the conductive pins of the product. Each of the pin sockets is also electrically connected to the first channel, the second channel, the third channel, and the fourth channel.

6. The impedance measurement system according to claim 5, wherein: The impedance measurement system further includes a fixing mechanism for fixing the relay board and the adapter board.

7. The impedance measurement system according to claim 1, wherein: The measuring instrument is an impedance analyzer.

8. The impedance measurement system according to claim 1, wherein: The control unit is a computer.

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