Sampling device for measuring current

Abstract

The utility model discloses a sampling device for measuring current. The sampling device comprises a power supply access end used for accessing a power supply; an ammeter; at least one group of sampling resistor configurators, each group of sampling resistor configurators comprising: a first change-over switch, the first end of which is electrically connected with the power supply access end; the first end of the second change-over switch is electrically connected with the power supply access end through the ampere meter, and the second end of the second change-over switch is electrically connected with the second end of the first change-over switch and serves as a first output node; the first end of the variable resistance module is electrically connected with the first output node, the second end of the variable resistance module serves as a second output node, and the variable resistance module operably provides various resistance values. The flexibility of the sampling device for measuring the current can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit system, in particular to a sampling device for measuring current. BACKGROUND

[0002] With the increasing degree of electrification of automobiles, the power consumption of vehicle-mounted electronics and electrical products as an important indicator has higher and higher requirements in the product design and development process. In research and development testing, the measurement and monitoring of the power consumption of such products is the core of the measurement and long-term monitoring of their current parameters. Vehicle-mounted electronics and electrical products have diversified working modes and power consumption situations as the types and functions continue to enrich. In various working modes, accurate measurement and analysis of current parameters in various ranges are the key way to control the power consumption parameters of vehicle-mounted electronics and electrical products in the development process. The current parameters of vehicle-mounted electronics and electrical products under various working modes have great differences, often requiring measurement and long-term monitoring of current parameters of various sizes from microamperes to amperes. Such a large span of current range requires high-precision meters or probes, and even multiple gear measurement instruments to be combined and switched for measurement. However, the verification of vehicle-mounted electronics and electrical products in testing often requires multiple groups of multi-station testing, and the cost of configuring all such instruments for measurement is very high, and in multi-station testing benches and equipment, such a solution will greatly increase the size of the bench equipment. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the embodiment of the present application is to provide a sampling device for measuring current, to solve the problem of complex and heavy device for measuring current in the prior art.

[0004] In order to achieve the above-mentioned purpose, the first aspect of the present application provides a sampling device for measuring current, the sampling device comprising:

[0005] a power access end for accessing a power supply;

[0006] an ammeter;

[0007] at least one set of sampling resistor configurator, each set of sampling resistor configurator comprising:

[0008] a first switch, a first end of the first switch being electrically connected to the power access end;

[0009] a second switch, a first end of the second switch being electrically connected to the power access end through the ammeter, and a second end of the second switch being electrically connected to a second end of the first switch and serving as a first output node;

[0010] The variable resistance module has a first end electrically connected to the first output node and a second end as a second output node, and is operable to provide a plurality of resistance values.

[0011] In the embodiment of the present application, the sampling device further comprises:

[0012] The controller controls the second switch to be off when the first switch is on, and controls the second switch to be on when the first switch is off.

[0013] In the embodiment of the present application, the variable resistance module comprises:

[0014] a plurality of resistance elements; and

[0015] a plurality of controllable switches, one of the plurality of controllable switches being connected in parallel with one of the plurality of resistance elements.

[0016] In the embodiment of the present application, the controllable switch comprises a short-circuit relay.

[0017] In the embodiment of the present application, the sampling device further comprises:

[0018] a power output end;

[0019] a product to be tested, a first end of the product to be tested being electrically connected to the second output node, and a second end of the product to be tested being electrically connected to the power output end.

[0020] In the embodiment of the present application, the product to be tested is in one-to-one correspondence with the sampling resistance configurator.

[0021] In the embodiment of the present application, the first output node comprises a connector or a terminal.

[0022] In the embodiment of the present application, the second output node comprises a connector or a terminal.

[0023] In the embodiment of the present application, the ammeter comprises a high-precision digital multimeter.

[0024] In the embodiment of the present application, the first switch or the second switch comprises a switching relay.

[0025] The sampling device for measuring current of the application comprises a power access end, an ammeter and at least one set of sampling resistance configurator. Each set of sampling resistance configurator comprises a first switching switch, a second switching switch and a variable battery module. The first end of the first switching switch is electrically connected with the power access end. The first end of the second switching switch is electrically connected with the power access end through the ammeter, and the second end of the second switching switch is electrically connected with the second end of the first switching switch and serves as a first output node. The first end of the variable battery module is electrically connected with the first output node, and the second end serves as a second output node. The variable battery module is operable to provide multiple resistance values. The application controls whether the current passes through the ammeter through the first switching switch and the second switching switch, and combines the variable resistance module to measure the current of the target to be measured. The application also adjusts the variable resistance module flexibly to improve the flexibility of the sampling device.

[0026] Other features and advantages of the embodiments of the application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings are included to provide a further understanding of the embodiments of the application, and constitute a part of the specification, and are used to explain the embodiments of the application together with the specific embodiments below, but do not constitute a limitation on the embodiments of the application. In the drawings:

[0028] Figure 1 A schematic structural diagram of a sampling device for measuring current according to an embodiment of the application is shown;

[0029] Figure 2 A schematic structural diagram of another sampling device for measuring current according to an embodiment of the application is shown. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the application more clear, the technical scheme of the embodiments of the application will be described clearly and completely below in conjunction with the drawings of the embodiments of the application. It should be understood that the specific embodiments described herein are only used to explain and explain the embodiments of the application, and do not limit the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the application.

[0031] It should be noted that if the embodiments of the application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0033] Figure 1 The structure diagram of a sampling device for measuring current according to an embodiment of the present application is schematically shown. As shown in the figure, the present application provides a sampling device for measuring current, which can include: Figure 1

[0034] A power access end Us1 for accessing power supply;

[0035] An ammeter;

[0036] At least one set of sampling resistance configurator, each set of sampling resistance configurator includes:

[0037] First switching switch K11, K21 and K31, the first end of the first switching switch is electrically connected with the power access end Us1;

[0038] Second switching switch K12, K22 and K32, the first end of the second switching switch is electrically connected with the power access end Us1 through the ammeter, and the second end of the second switching switch K12, K22 and K32 is electrically connected with the second end of the first switching switch K11, K21 and K31 and serves as a first output node U11;

[0039] Variable resistance module, the first end of the variable resistance module is electrically connected with the first output node U11, and the second end serves as a second output node U12, and the variable resistance module can operatively provide a plurality of resistance values.

[0040] ​In the embodiment of the present application, the power access end Us1 can be the positive electrode, and those skilled in the art can understand that the power source can be a battery, can be 220V or 380V industrial power, or can be a power source obtained after voltage reduction or voltage increase, etc. The power output end Us2 can be the negative electrode, and the power output end Us21 can be used for grounding. The ammeter is used for measuring and calibrating the current of each sampling resistor configuration tester loop, and preferably, the ammeter can be a high-precision ammeter or a high-precision digital multimeter. The first ends of the first switching switches K11, K21 and K31 are electrically connected with the power access end Us1, and in the case that the first switching switches K11, K21 and K31 are closed, the second switching switches K12, K22 and K32 are automatically disconnected, and the current can be directly transmitted from the first switching switches K11, K21 and K31 to the first output nodes U11, U21 and U31 without passing through the ammeter. Similarly, the first ends of the second switching switches K12, K22 and K32 are electrically connected with the ammeter, and in the case that the second switching switches K12, K22 and K32 are closed, the first switching switches K11, K21 and K31 are automatically disconnected, and the current is transmitted from the power access end Us1 to the first output nodes U11, U21 and U31 through the ammeter and the second switching switches. The first switching switches K11, K21 and K31 and the second switching switches K12, K22 and K32 can be opened and closed according to actual needs, for example, K11 is closed and K12 is disconnected, K12 is closed and K11 is disconnected, or K11 and K12 are simultaneously disconnected and the sampling configuration tester in this group is not powered on. U12, U22 and U32 are the second output nodes, and after the sampling configuration tester is powered on, the current passes through the second output nodes to the products to be measured DUT. It can be understood that the number of products to be measured is not limited.

[0041] In the embodiment of the present application, a variable resistance module is also provided in each group of sampling resistor configuration testers. The first end of the variable resistance module is electrically connected with the first output node, and the second end of the variable resistance module can be used as the second output node. The variable resistance module can include a plurality of resistors, and each of the plurality of resistors has a one-to-one corresponding controllable switch connected in parallel with the resistor. Whether the resistor corresponding to the controllable switch is powered on or not can be controlled through the controllable switch, so as to adjust the total resistance of the group of sampling resistor configuration testers according to the target object to be measured. It can be understood that the resistor can be replaced by a resistor with different resistance. For example, R11, R12, R13, K13, K14 and K15 form a group of variable resistance modules, and in the case that K13 is disconnected and K14 and K15 are closed, the current only passes through R11.

[0042] In the embodiment of the present application, the variable resistance module can further include at least one group of adjustable resistors, each group of adjustable resistors can include: a resistor element, a first end of each resistor element is connected in series with the first output node or another group of adjustable resistors, a second end of the resistor element is connected in series with the second output node or another group of adjustable resistors; a controllable switch, the controllable switch is connected in parallel with the resistor element, a first end of the controllable switch is connected in series with the first output node or another group of adjustable resistors, a second end of the controllable switch is connected in series with the second output node or another group of adjustable resistors, for controlling the opening and closing of the corresponding resistor element. In the case of the controllable switch being turned off, the first end of the controllable switch corresponding resistor element is electrically connected with the first output node or another group of adjustable resistors. In the case of the controllable switch being turned on, the first end of the controllable switch is electrically connected with the first output node or another group of adjustable resistors, and the second end of the controllable switch is electrically connected with the second output node or another group of adjustable resistors. For example, R11 and K13 are a group of adjustable resistors, R12 and K14 are a group of adjustable resistors, R13 and K15 are a group of adjustable resistors, R21 and K23 are a group of adjustable resistors, R22 and K24 are a group of adjustable resistors, R23 and K25 are a group of adjustable resistors, R31 and K33 are a group of adjustable resistors, R32 and K34 are a group of adjustable resistors, and R33 and K35 are a group of adjustable resistors.

[0043] In the embodiment of the present application, the measuring device can further include a controller, the controller controls the second switch to be turned off when the first switch is turned on, and controls the second switch to be turned on when the first switch is turned off.

[0044] In the embodiment of the present application, the variable resistance module can include a plurality of resistor elements and a plurality of controllable switches, one controllable switch in the plurality of controllable switches is connected in parallel with one resistor element in the plurality of resistor elements.

[0045] In the embodiment of the present application, the controllable switch can include a short-circuit relay for controlling the closing or opening of the corresponding resistor.

[0046] In the embodiment of the present application, the sampling device can further include a power output end Us2 and Us21, and a DUT1, a DUT2 and a DUT3, a first end of the DUT is electrically connected with the second output node, and a second end of the DUT is electrically connected with the power output end.

[0047] In the embodiment of the present application, the DUT corresponds to the sampling resistance configurator one by one.

[0048] In the embodiment of the present application, the first output node can include a connector or a terminal.

[0049] In the embodiment of the present application, the second output node can include a connector or a terminal.

[0050] In this embodiment, the first switching switch or the second switching switch includes a switching relay.

[0051] Through the above technical solution, the configuration of the variable resistor module and the adjustable resistor in this application can flexibly measure the current of the target product under test.

[0052] Figure 2 This schematically illustrates a structural diagram of another sampling device for measuring current according to an embodiment of this application. Figure 2 As shown in the embodiments of this application, the battery is a power source used to provide... Figure 2 The sampling device is powered by the power supply. The power input terminal Us1, and the power output terminals Us2 and Us21 are electrically connected to the power supply, forming a loop. Taking the sampling resistor configurator where the first output node U11 is located as an example, U11 is the first output node. From the first output node U11 to the sixth output node U61, it indicates that the sampling device can simultaneously connect multiple sets of sampling resistor configurators in parallel. Each set of sampling resistor configurators has two resistor elements, and each pair of resistor elements corresponds to one controllable switch. Taking the variable resistor module connected in series with the first output node U11 as an example, the controllable switch K1 can control the short-circuit state of the two resistor elements. When the controllable switch K1 is connected downwards, the current only passes through the 0.1Ω resistor element. The 100Ω resistor element is short-circuited by the controllable switch K1, and the current is transmitted through the 0.1Ω resistor element to the output node U12 or U62, and finally to the DUT1 product under test. The working principle of the sampling resistor configurator where U61 is located is the same as that of the sampling resistor configurator where U11 is located. The current can pass through the first output node of U61, and according to the state of the controllable switch K6, it passes through the 0.1Ω or 100Ω resistor element to the second output node, and then through the product under test DUT6 to form a loop with Us21 and Us2. Figure 2 The sampling device shown for measuring current can also include multiple sampling group configurators, which can be determined according to the specific scenario. For example, the products under test (DUT2 to DUT5) also correspond to at least four sampling resistor configurators, and... Figure 2 The remaining two sets of sampling resistor configurators are connected in parallel.

[0053] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0054] The above merely provides an example of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall fall into the scope of claims of the present application.

Claims

1. A sampling device for measuring an electrical current, characterized by, The sampling device comprises: a power input end for inputting power; a current meter; at least one set of sampling resistor configuration, each set of the sampling resistor configuration comprising: a first switch, a first end of the first switch being electrically connected to the power input end; a second switch, a first end of the second switch being electrically connected to the power input end through the current meter, a second end of the second switch being electrically connected to a second end of the first switch and serving as a first output node; a variable resistor module, a first end of the variable resistor module being electrically connected to the first output node, a second end of the variable resistor module serving as a second output node, the variable resistor module being operable to provide a plurality of resistance values.

2. The sampling device of claim 1, wherein, Further comprising: a controller, the controller being configured to control the second switch to be turned off when the first switch is turned on, and to control the second switch to be turned on when the first switch is turned off.

3. The sampling device of claim 1, wherein, The variable resistor module comprises: a plurality of resistor elements; and a plurality of controllable switches, one of the plurality of controllable switches being connected in parallel to one of the plurality of resistor elements.

4. The sampling device of claim 3, wherein, The controllable switch comprises a short-circuit relay.

5. The sampling device of claim 1, wherein, The sampling device further comprises: a power output end; a product to be tested, a first end of the product to be tested being electrically connected to the second output node, a second end of the product to be tested being electrically connected to the power output end.

6. The sampling device of claim 5, wherein, The product to be tested corresponds to the sampling resistor configuration one by one.

7. The sampling device of claim 1, wherein, The first output node comprises a connector or a terminal.

8. The sampling device of claim 1, wherein, The second output node comprises a connector or a terminal.

9. The sampling device of claim 1, wherein, The current meter comprises a high-precision digital multimeter.

10. The sampling device of claim 1, wherein, The first switch or the second switch comprises a switching relay.

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