Current detection circuit and current detection system

Abstract

The utility model provides a current detection circuit and a current detection system, the current detection circuit is used for parallel current detection of at least two to-be-detected pins of a to-be-detected device, the current detection circuit comprises a detection module and a plurality of matched resistors, and the detection module comprises a plurality of detection terminals; the to-be-tested device is connected with the power supply device, the to-be-tested device comprises at least two to-be-tested pins, and the power supply device supplies power to the to-be-tested device; each matched resistor is connected in series between the positive terminal of the power supply device and one end of the corresponding to-be-tested pin, and is used for converting a first voltage output by the power supply device into a second voltage; each detection terminal is connected to an intermediate node after the matching resistor and the corresponding to-be-detected pin are connected in series so as to acquire a second voltage. According to the current detection circuit provided by the utility model, the current value of each pin to be detected can be detected at one time through the detection module and the matched resistor, the test efficiency is improved, the instability caused by a relay is avoided, and the test stability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of product aging testing, in particular to a current detection circuit and a current detection system. Background Art

[0002] During the millimeter-wave radar aging test, the radar current needs to be monitored. The purpose is to monitor the radar power changes in real time during the aging process with high temperature to prevent abnormal failure of the radar function. The current common test method is to use an ammeter with a relay to test each test point of the radar one by one. During each test, the relay needs to be switched on multiple times. However, the relay has a mechanical service life, which can easily lead to unstable tests. In addition, the above test method cannot monitor the current changes of each test point at the same time. The relay needs to be switched on again and again to obtain the current value of the corresponding test point. Utility Model Content

[0003] The utility model aims to at least solve the problems of unstable testing caused by relays and inability to test multiple test points simultaneously, and provides a current detection circuit.

[0004] The purpose of the utility model is achieved by the following technical solutions:

[0005] According to one aspect of the utility model, a current detection circuit is provided for detecting current in parallel for at least two pins to be tested of a device to be tested, comprising: a detection module and a plurality of matching resistors, wherein the detection module comprises a plurality of detection terminals;

[0006] The device under test is connected to a power supply device, the device under test includes at least two pins under test, and the power supply device supplies power to the device under test;

[0007] Each matching resistor is connected in series between the positive terminal of the power supply device and one end of the corresponding pin to be tested, and is used to convert the first voltage output by the power supply device into a second voltage;

[0008] Each detection terminal is connected to an intermediate node of the matching resistor and the corresponding pin to be tested in series to obtain the second voltage.

[0009] Furthermore, the other ends of all the pins to be tested of the device to be tested are connected to the negative terminal of the power supply device.

[0010] Furthermore, it also includes: a controller;

[0011] The controller is connected to the power supply device and is used to obtain the first voltage output by the power supply device;

[0012] The controller is connected to the detection module and is used to obtain the second voltage output by each detection terminal of the detection module;

[0013] The controller is further configured to obtain a current value corresponding to each detection terminal according to the first voltage, the second voltage and the resistance value of the corresponding matching resistor.

[0014] Furthermore, the controller includes a processor.

[0015] Furthermore, the detection module is a data acquisition card, which is used to simultaneously acquire the second voltages of all the intermediate nodes.

[0016] Furthermore, the device under test includes a baseband power board and a circuit board, the baseband power board is connected to the circuit board, the baseband power board is connected to the power supply device, and the baseband power board is used to convert the voltage provided by the power supply device into the voltage required by the circuit board.

[0017] Furthermore, the circuit board is a radio frequency board in a radar device.

[0018] Furthermore, the resistance of the matching resistor is 3.3Ω.

[0019] Furthermore, the device to be tested is arranged in an aging box.

[0020] According to another aspect of the present invention, there is provided a current detection system, comprising:

[0021] Device under test;

[0022] a power supply device, connected to the device under test and used to supply power to the device under test;

[0023] And a current detection circuit as described in any one of the above.

[0024] The current detection circuit provided in the embodiment of the present application does not need to use a relay in the process of testing the current. The current value of each pin to be tested can be detected at one time through the detection module and the matching resistor, thereby improving the test efficiency, avoiding the instability caused by the relay, and improving the test stability. In addition, the multimeter is saved in terms of hardware, and the overall structure is relatively simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other implementation methods can be obtained based on these drawings without paying any creative work.

[0026] Figure 1is a schematic diagram of a current detection system provided according to an embodiment of the utility model;

[0027] Figure 2 It is a schematic diagram of a current detection circuit provided according to an embodiment of the utility model. DETAILED DESCRIPTION

[0028] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "depth" will be used to indicate that each component element of the pressure sensor in the embodiment of the present invention extends along the direction of the first axis Z of the Cartesian reference system XYZ, and the terms "length" and "width" respectively indicate that each component element of the pressure sensor in the embodiment of the present invention extends along the direction of the second axis X and the third axis Y of the Cartesian coordinate system XYZ. The terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection or mutual communication; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. When it comes to method steps, the sequence of this article represents an exemplary scheme, but does not represent a limitation on the sequence of sequence. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Figure 1 is a schematic diagram of a current detection system provided according to an embodiment of the utility model, Figure 2 It is a schematic diagram of a current detection circuit provided according to an embodiment of the utility model.

[0032] like Figure 1-Figure 2 As shown, an embodiment of the utility model provides a current detection system, which includes a device to be tested 100 , a power supply device 200 and a current detection circuit 300 .

[0033] The power supply device 200 is connected to the device under test 100 and the current detection circuit 300 respectively, and supplies power to the device under test 100 and the current detection circuit 300 .

[0034] Exemplarily, the current detection circuit 300 includes a detection module 3010, a matching resistor 3020 and a controller 3030, the device under test 100 includes at least two pins under test, the power supply device 200 includes a positive terminal and a negative terminal, and the number of pins under test is the same as the number of matching resistors 3020.

[0035] The detection module 3010 includes a ground terminal and at least two detection terminals, and one detection terminal can detect a second voltage after passing through a matching resistor.

[0036] In some embodiments, the detection module 3010 may be a device such as a multi-channel data acquisition module, a digital oscilloscope, a digital recorder, etc. that can simultaneously acquire multiple second voltages. Preferably, the detection module 3010 is a data acquisition card, which is used to simultaneously acquire the second voltages of all the intermediate nodes. The above-mentioned data acquisition card may have 4 to hundreds of detection terminals, one detection terminal can acquire one second voltage, and one data acquisition card can acquire hundreds of second voltages at most simultaneously, completing the current value detection of hundreds of pins to be tested.

[0037] Furthermore, each matching resistor 3020 is connected in series between the positive terminal of the power supply device 200 and one end of the corresponding pin to be tested, and is used to convert the first voltage output by the power supply device 200 into a second voltage.

[0038] Each detection terminal is connected to an intermediate node of the matching resistor 3020 and the corresponding pin to be tested in series to obtain the second voltage.

[0039] Among them, the current of the power supply device 200 flows through the matching resistor 3020 and the pin to be tested in sequence to form a loop. The detection terminal is connected after the matching resistor 3020 to detect the remaining voltage (i.e., the second voltage) after the voltage provided by the power supply device 200 passes through the matching resistor 3020.

[0040] The other ends of all the pins to be tested of the device to be tested 100 are connected to the negative terminal of the power supply device 200 .

[0041] It should be noted that the term "at least one" herein, when used with a series of items, means that different combinations of one or more of the listed items may be used, and only one of each item in the list may be required. For example, "at least one of item A, item B, and item C" may include, but is not limited to, item A or item A and item B. This example may also include item A, item B, and item C, or item B and item C. In other examples, "at least one" may be, for example, but not limited to, two items A, one item B and ten items C, four items B and seven items C, or some other suitable combination.

[0042] For example, when there are three pins to be tested, namely, pin X to be tested, pin Y to be tested, and pin Z to be tested, and pin X to be tested and pin Y to be tested need to be tested, pin X to be tested and pin Y to be tested are respectively connected to the detection module 3010 to form two connection lines.

[0043] For another example, when there are three pins to be tested, namely, pin X to be tested, pin Y to be tested, and pin Z to be tested, and it is necessary to test pin X to be tested, pin Y to be tested, and pin Z to be tested, then pin X to be tested, pin Y to be tested, and pin Z to be tested are respectively connected to the detection module 3010 to form three connection lines.

[0044] For another example, when there are three pins to be tested, namely, pin X, pin Y, pin Z, and pin M, it is necessary to test pin Y and pin Z. Pin Y and pin Z are connected to the detection module 3010 to form two connection lines.

[0045] It can be seen that in a specific implementation, the pins to be detected can be in any number and in any combination, and the detection module 3010 can detect the current value of the pins to be detected.

[0046] In some embodiments, the power supply device 200 may use a programmable power supply, which is a power supply device with programmable output, used to provide a stable and adjustable power supply of various voltages and currents.

[0047] The output voltage range of the programmable power supply can be 0-30V, 0-60V, 0-100V, etc., and the output current range of the programmable power supply can be 0-3A, 0-10A, 0-20A, etc. These ranges can meet the needs of most radar tests. The programmable power supply has a positive terminal and a negative terminal.

[0048] In some embodiments, the controller 3030 is connected to the power supply device 200 and the detection module 3010 respectively, and the controller 3030 is used to obtain the first voltage output by the power supply device 200, and to obtain the second voltage output by each detection terminal of the detection module 3010, and then obtain the current value corresponding to each detection terminal based on the first voltage, the second voltage and the resistance value of the corresponding matching resistor 3020.

[0049] Specifically, the current of the pin to be tested is calculated as follows: I x =(V 电源 -V x ) / R, where R is the matching resistor 3020 corresponding to the pin to be tested, V x is the second voltage of the corresponding pin to be tested detected by the detection module 3010, V 电源 A first voltage provided by the power supply device 200.

[0050] like Figure 2 As shown, the detection module can obtain the second voltage at the intermediate nodes a, b, c, d, e, f, and g, and use V a 、V b 、V c 、V d 、V e 、V f 、V g Refers to the specific voltage value detected, and then according to the resistance value of the matching resistor 3020 corresponding to each intermediate node (i.e., R1, R2, R3, R4, R5, R6, R7 respectively) and the following calculation formula, the current value I at the pins to be tested DUT1, DUT2, DUT3, DUT4, DUT5, DUT6, and DUT7 is calculated respectively. a ,I b ,I c ,I d ,I e ,I f ,I g :

[0051] I a =(V 电源 -V a ) / R1;

[0052] I b =(V 电源 -V b ) / R2;

[0053] I c =(V 电源 -V c ) / R3;

[0054] I d =(V 电源 -V d ) / R4;

[0055] I e =(V 电源 -V e ) / R5;

[0056] I f =(V 电源 -V f ) / R6;

[0057] I g =(V 电源 -V g ) / R7.

[0058] In some embodiments, the controller 3030 can control the first voltage output by the power supply device 200, such as +12V or +5V voltage, and the controller 3030 includes a processor.

[0059] In some embodiments, when the device under test 100 is a radar device, the impedance of the device under test 100 is usually about 1 MΩ. At this time, the matching resistor 3020 uses a high-precision 0.01% sampling standard precision resistor, and the resistance is 3.3Ω.

[0060] The controller 3030 in the present invention may include one or more processors of processing cores, one or more computer-readable storage media memories, a power supply, an input unit and other components.

[0061] In some embodiments, the device under test 100 includes a baseband power board and a circuit board, the baseband power board is connected to the circuit board, the baseband power board is connected to the power supply device 200, and the baseband power board is used to convert the voltage provided by the power supply device 200 into the voltage required by the circuit board.

[0062] In some embodiments, the circuit board is a radio frequency board in a radar device, and the radar may be a millimeter wave radar, a Doppler radar, an ultra-wideband radar, and the like.

[0063] In some embodiments, the device under test 100 is placed in an aging chamber.

[0064] The current values ​​obtained above are used to evaluate the current stability and reliability of the radar equipment under long-term operation and high-load conditions. The current load of the radar equipment in actual use is simulated by placing the device under test in an aging box to verify whether there are current changes, overloads, overheating and other problems during long-term operation.

[0065] It can be seen that the utility model does not need to use a relay in the process of testing the current. The current value of each pin to be tested can be detected at one time through the detection module 3010 and the matching resistor 3020, which improves the test efficiency, avoids the instability caused by the relay, and improves the test stability. In addition, the multimeter is saved in terms of hardware, and the overall structure is relatively simple.

[0066] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A current detection circuit for detecting current in parallel for at least two pins to be tested of a device to be tested, characterized in that: include: A detection module and a plurality of matching resistors, wherein the detection module comprises a plurality of detection terminals; The device under test is connected to a power supply device, the device under test includes at least two pins under test, and the power supply device supplies power to the device under test; Each matching resistor is connected in series between the positive terminal of the power supply device and one end of the corresponding pin to be tested, and is used to convert the first voltage output by the power supply device into a second voltage; Each detection terminal is connected to an intermediate node of the matching resistor and the corresponding pin to be tested in series to obtain the second voltage.

2. The current detection circuit according to claim 1, characterized in that: The other ends of all the pins to be tested of the device to be tested are connected to the negative terminal of the power supply device.

3. The current detection circuit according to claim 1, characterized in that: Also includes: Controller; The controller is connected to the power supply device and is used to obtain the first voltage output by the power supply device; The controller is connected to the detection module and is used to obtain the second voltage output by each detection terminal of the detection module; The controller is further configured to obtain a current value corresponding to each detection terminal according to the first voltage, the second voltage and the resistance value of the corresponding matching resistor.

4. The current detection circuit according to claim 3, characterized in that: The controller includes a processor.

5. The current detection circuit according to claim 1, characterized in that: The detection module is a data acquisition card, which is used to simultaneously acquire the second voltages of all the intermediate nodes.

6. The current detection circuit according to claim 1, characterized in that: The device under test includes a baseband power board and a circuit board, the baseband power board is connected to the circuit board, the baseband power board is connected to the power supply device, and the baseband power board is used to convert the voltage provided by the power supply device into the voltage required by the circuit board.

7. The current detection circuit according to claim 6, characterized in that: The circuit board is a radio frequency board in a radar device.

8. The current detection circuit according to claim 7, characterized in that: The resistance of the matching resistor is 3.3Ω.

9. The current detection circuit according to any one of claims 1 to 8, characterized in that: The device to be tested is arranged in an aging box.

10. A current detection system, characterized in that: include: Device under test; a power supply device, connected to the device under test and used to supply power to the device under test; And a current detection circuit as claimed in any one of claims 1 to 9.

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