Switch control circuit and test system

Abstract

The utility model discloses a switch control circuit and a test system, the switch control circuit comprises a plurality of cascaded switch modules, the output of the previous switch module in every two adjacent switch modules included in the plurality of cascaded switch modules is the input of the next switch module, and the output of the next switch module is the input of the next switch module; the plurality of switch modules are connected with the control ends of the plurality of controlled switches in a one-to-one correspondence manner, the first ends of the controlled switches are electrically connected with the test equipment, the second ends of the controlled switches are electrically connected with the tested equipment, and the third ends of the controlled switches are electrically connected with the power supply; the control module is provided with at least one output interface, each output interface of the control module is used for being connected with one switch module, and any output interface of the control module is electrically connected with any switch module. Therefore, automatic control of the plurality of controlled switches arranged between the tested equipment and the test equipment is realized, manual closing is not needed, the operation is simple and convenient, the efficiency is relatively high, and errors are not easy to occur.

Description

Technical Field

[0001] The present application relates to the field of circuit technology, and in particular to a switch control circuit and a test system. Background Art

[0002] In order to ensure the quality of the equipment produced, it is often necessary to test the equipment. For example, with the development of battery management system (BMS), users have higher and higher requirements for BMS. In order to ensure the quality of BMS products, BMS needs to be tested.

[0003] When testing the BMS, it is necessary to manually close multiple switches between the BMS and the test equipment, which is cumbersome, inefficient, and prone to errors. Utility Model Content

[0004] The present application provides a switch control circuit and a test system, which can realize automatic control of a plurality of controlled switches arranged between a device under test and a test device, without the need for manual closing, with simple operation, high efficiency, and less prone to errors.

[0005] In a first aspect, the present application provides a switch control circuit, comprising: a plurality of cascaded switch modules, wherein the output of the previous switch module in each two adjacent switch modules included in the cascaded plurality of switch modules is the input of the subsequent switch module, the plurality of switch modules are connected one-to-one with the control ends of a plurality of controlled switches, the first end of the controlled switch is electrically connected to a test device, the second end of the controlled switch is electrically connected to a device under test, and the third end of the controlled switch is electrically connected to a power supply; a control module, the control module having at least one output interface, each output interface of the control module being respectively used to connect a switch module, and any output interface of the control module being electrically connected to any switch module.

[0006] In the embodiment of the present application, the switch control circuit includes a plurality of cascaded switch modules and a control module. The output of the previous switch module in each of the two adjacent switch modules included in the cascaded multiple switch modules is the input of the next switch module. Therefore, the cascaded multiple switch modules can be controlled by outputting a control signal through the control module. Since the multiple switch modules are connected to the control ends of the multiple controlled switches in a one-to-one correspondence, the control of the multiple controlled switches can be realized. In this way, the automatic control of the multiple controlled switches set between the device under test and the test device is realized, without manual closing, the operation is simple, the efficiency is high, and it is not easy to make mistakes.

[0007] In a possible implementation of the first aspect, every two adjacent switch modules in the multiple switch modules include a first switch module and a second switch module, the multiple controlled switches include at least the first controlled switch and the second controlled switch, and the at least one output interface of the control module includes at least the first output interface; the first switch module includes a first switch unit and a second switch unit, the control end of the first switch unit is electrically connected to the first output interface, the first end of the first switch unit is grounded, the second end of the first switch unit is respectively electrically connected to the control end of the second switch unit and the control end of the first controlled switch, the first end of the second switch unit is electrically connected to the control end of the third switch unit in the second switch module, the first end of the second switch unit is also grounded, and the second end of the second switch unit is electrically connected to the power supply; the second switch module includes a third switch unit, the first end of the third switch unit is grounded, and the second end of the third switch unit is electrically connected to the control end of the second controlled switch.

[0008] In the embodiment of the present application, cascade control between multiple switch modules can be achieved through the switch unit set in each switch module, so there is no need to control multiple controlled switches one by one, and there is no need for each controlled switch to occupy an output interface of the control module respectively.

[0009] In a possible implementation of the first aspect, the at least one output interface of the control module further includes a second output interface, and the second output interface is electrically connected to the control end of the third switch unit.

[0010] In the embodiment of the present application, by connecting the multiple switch modules to the multiple output interfaces of the control module in a one-to-one correspondence, some of the multiple controlled switches can be flexibly controlled to be closed.

[0011] In a possible implementation of the first aspect, the first switch module also includes: a first current limiting unit, the first end of the first current limiting unit is electrically connected to the second end of the first switch unit and the control end of the second switch unit respectively, and the second end of the first current limiting unit is electrically connected to the power supply.

[0012] In the embodiment of the present application, by setting the first end of the first current limiting unit to be electrically connected to the second end of the first switch unit and the control end of the second switch unit respectively, the first switch unit and the second switch unit can be prevented from being broken down.

[0013] In a possible implementation of the first aspect, the first switch module also includes: a second current limiting unit, the first end of the second current limiting unit is electrically connected to the first end of the first current limiting unit, the second end of the first switch unit and the control end of the first controlled switch, respectively, and the second end of the second current limiting unit is electrically connected to the control end of the second switch unit.

[0014] In the embodiment of the present application, by setting the first end of the second current limiting unit to be electrically connected to the first end of the first current limiting unit, and the second end of the second current limiting unit to be electrically connected to the control end of the second switch unit, the second switch unit can be prevented from being broken down.

[0015] In a possible implementation of the first aspect, the first switch module further includes: a third current limiting unit, a first end of the third current limiting unit is electrically connected to the second end of the second switch unit, and a second end of the third current limiting unit is electrically connected to the power supply.

[0016] In the embodiment of the present application, by setting the first end of the third current limiting unit to be electrically connected to the second end of the second switch unit, the second switch unit can be prevented from being broken down.

[0017] In a possible implementation of the first aspect, the second switch module also includes: a fourth current limiting unit, the first end of the fourth current limiting unit is electrically connected to the first end of the second switch unit and the second output interface respectively, the second end of the fourth current limiting unit is electrically connected to the control end of the third switch unit, and the third end of the fourth current limiting unit is grounded.

[0018] In the embodiment of the present application, by setting the second end of the fourth current limiting unit to be electrically connected to the control end of the third switch unit, the third switch unit can be prevented from being broken down.

[0019] In a possible implementation of the first aspect, the fourth current limiting unit includes: a current limiting sub-unit, the first end of the current limiting sub-unit is electrically connected to the first end of the second switch unit and the second output interface, respectively, and the second end of the current limiting sub-unit is electrically connected to the first end of the voltage dividing sub-unit and the control end of the third switch unit, respectively; a voltage dividing sub-unit, the first end of the voltage dividing sub-unit is electrically connected to the control end of the third switch unit, and the second end of the voltage dividing sub-unit is grounded.

[0020] In the embodiment of the present application, by setting the second end of the current limiting subunit to be electrically connected to the control end of the third switch unit, and the first end of the voltage dividing subunit to be electrically connected to the control end of the third switch unit, the third switch unit can be prevented from being broken down.

[0021] In a possible implementation of the first aspect, the control module includes: a control unit, an output interface of the control unit is electrically connected to an input interface of a decoder; a decoder, the decoder having at least one output interface, each output interface of the decoder being used to connect to a switch module, and any output interface of the decoder being electrically connected to any switch module.

[0022] In the embodiment of the present application, the IO interface of the MCU is expanded by using a 38 decoder, thereby avoiding insufficient IO interface of the MCU.

[0023] Based on the same design concept, in a second aspect, an embodiment of the present application further provides a test system, which includes a test device and a switch control circuit as described in any embodiment of the first aspect.

[0024] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, 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 present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0026] Figure 1 One of the structural schematic diagrams of a switch control circuit provided in some embodiments of the present application;

[0027] Figure 2 A second structural schematic diagram of a switch control circuit provided in some embodiments of the present application;

[0028] Figure 3 A third structural diagram of a switch control circuit provided in some embodiments of the present application;

[0029] Figure 4 A fourth structural diagram of a switch control circuit provided in some embodiments of the present application;

[0030] Figure 5 A fifth structural diagram of a switch control circuit provided in some embodiments of the present application;

[0031] Figure 6 A sixth structural diagram of a switch control circuit provided in some embodiments of the present application;

[0032] Figure 7 A seventh structural diagram of a switch control circuit provided in some embodiments of the present application;

[0033] Figure 8 An eighth structural diagram of a switch control circuit provided in some embodiments of the present application;

[0034] Fig. 9 A ninth structural diagram of a switch control circuit provided in some embodiments of the present application;

[0035] Fig.10A tenth structural diagram of a switch control circuit provided in some embodiments of the present application;

[0036] Fig.11 The eleventh structural diagram of a switch control circuit provided in some embodiments of the present application;

[0037] Fig.12 A schematic diagram of the module structure of a test system provided in some embodiments of the present application. DETAILED DESCRIPTION

[0038] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0040] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0041] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0043] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0044] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0045] At present, in order to ensure the quality of the produced equipment, it is often necessary to test the equipment. For example, with the development of BMS, users have higher and higher requirements for BMS. In order to ensure the quality of BMS products, BMS needs to be tested.

[0046] When testing the BMS, it is necessary to close multiple switches between the BMS and the test board. Figure 1As shown, the first switch S1, the second switch S2 ... the third switch SN are multiple switches that need to be closed and are arranged between the BMS X and the test board Y. The control end of the first metal-oxide-semiconductor field-effect transistor (MOSFET) Q1 is electrically connected to the first input / output device interface (IO) D0_MOS1 of the controller, the first end of the first MOSFET Q1 is grounded, the second end of the first MOSFET Q1 is electrically connected to the control end of the first switch S1, the first end of the first switch S1 is electrically connected to the test board Y, the second end of the first switch S1 is electrically connected to the BMS X, and the third end of the first switch S1 is electrically connected to the power supply VDD. The control end of the second MOSFET Q2 is electrically connected to the second IO interface D0_MOS2 of the controller, the first end of the second MOSFET Q2 is grounded, the second end of the second MOSFET Q2 is electrically connected to the control end of the second switch S2, the first end of the second switch S2 is electrically connected to the test board Y, the second end of the second switch S2 is electrically connected to the BMS X, and the third end of the second switch S2 is electrically connected to the power supply VDD. A control end of the third MOSFET QN is electrically connected to a third IO interface D0_MOSN of the controller, a first end of the third MOSFET QN is grounded, a second end of the third MOSFET QN is electrically connected to a control end of a third switch SN, a first end of the third switch SN is electrically connected to the test board Y, a second end of the third switch SN is electrically connected to the BMS X, and a third end of the third switch SN is electrically connected to the power supply VDD.

[0047] In the related art, each switch can be closed one by one, and the closing principle of the first switch S1, the second switch S2 ... the third switch SN is the same. Taking the first switch S1 as an example, when the first switch S1 needs to be closed, a low level can be output to the control end of the first MOSFET Q1 through the first IO interface D0_MOS1 of the controller to turn on the first MOSFET Q1. In this way, the power supply VDD, the first switch S1 and the first MOSFET Q1 can form a loop, so that current passes between the control end of the first switch S1 and the third end of the first switch S1, so that the first switch S1 is closed. In this way, the test board Y connected to the first end of the first switch S1 and the BMS X connected to the second end of the switch can be connected, so that the test can be performed.

[0048] The researchers of this application noticed that in the above scheme, if multiple switches need to be controlled, multiple IO interfaces are required, and the control of each switch needs to occupy an IO interface. If the number of switches to be controlled is too large, there may be a shortage of IO interfaces. Moreover, when controlling multiple switches to be turned off, it is necessary to control multiple IO ports one by one to output low levels, which is cumbersome, inefficient, and prone to errors. Therefore, a solution is needed that can accurately and efficiently control multiple switches and avoid insufficient IO interfaces.

[0049] In order to solve the above technical problems, the researchers of this application found that if multiple switches can be controlled through one signal, the efficiency and accuracy of controlling multiple switches can be improved, and the number of IO interfaces used can also be reduced.

[0050] Based on the above findings, the researchers of this application proposed a switch control circuit and a test system, wherein the switch control circuit includes a plurality of cascaded switch modules and a control module. Among them, the plurality of switch modules are connected one-to-one with the control ends of the plurality of controlled switches, the first end of the controlled switch is electrically connected to the test device, the second end of the controlled switch is electrically connected to the device under test, and the third end of the controlled switch is electrically connected to the power supply; the control module has at least one output interface, each output interface of the control module is used to connect a switch module, and any output interface of the control module is electrically connected to any switch module.

[0051] Thus, the control module can output a control signal to control multiple cascaded switch modules. Since the multiple switch modules are connected to the control ends of the multiple controlled switches in a one-to-one correspondence, the control of the multiple controlled switches is achieved through one control signal, which not only reduces the number of output interfaces of the control module, but also eliminates the need to manually close the multiple controlled switches one by one. The operation is simple, efficient, and not prone to errors.

[0052] The switch control circuit provided in the embodiment of the present application is described in detail below.

[0053] Figure 2 The second structural diagram of the switch control circuit provided in some embodiments of the present application is as follows: Figure 2 As shown, the switch control circuit may include: a plurality of switch modules 210 and a control module 220 connected in cascade.

[0054] Among them, the output of the previous switch module in every two adjacent switch modules included in the cascaded multiple switch modules can be the input of the next switch module, the multiple switch modules 210 can be connected to the control ends of the multiple controlled switches 300 in a one-to-one correspondence, the first end of the controlled switch 300 can be electrically connected to the test device 400, the second end of the controlled switch 300 can be electrically connected to the device under test 500, and the third end of the controlled switch 300 can be electrically connected to the power supply;

[0055] The control module 220 may have at least one output interface. Each output interface of the control module may be used to connect to a switch module respectively. Any output interface of the control module 220 may be electrically connected to any switch module.

[0056] Here, for the cascaded multiple switch modules 210, in every two adjacent switch modules, the output of the previous switch module can be used as the input of the next switch module. Each switch module can include at least one switch unit.

[0057] The control module 220 may be a module with a control function, and may be used to output a control signal. The control module 220 may control the cascaded multiple switch modules 210 by outputting a control signal, so that the controlled switch 300 may be controlled by the cascaded multiple switch modules 210 .

[0058] The output interface of the control module 220 may be an IO interface.

[0059] Exemplarily, the controlled switch 300 may be a relay, the test device 400 may be a test board, and the device under test 500 may be a BMS.

[0060] Specifically, any output interface of the control module 220 is electrically connected to any switch module 210, and the control module 220 outputs a control signal that can control the conduction of multiple cascaded switch modules 210 through the output interface, thereby controlling the closure of the controlled switches 300 connected one-to-one to the multiple switch modules 210.

[0061] In the embodiment of the present application, a control module can output a control signal to control multiple cascaded switch modules. Since the multiple switch modules are connected to the control ends of the multiple controlled switches in a one-to-one correspondence, the control of the multiple controlled switches is achieved through one control signal, which not only reduces the number of output interfaces of the control module, but also eliminates the need to manually close the multiple controlled switches one by one. The operation is simple, efficient, and not prone to errors.

[0062] In some embodiments of the present application, Figure 3 As shown, each two adjacent switch modules in the multiple switch modules may include a first switch module and a second switch module, the multiple controlled switches may include at least a first controlled switch 310 and a second controlled switch 320, and at least one output interface of the control module 220 may include at least a first output interface D0_MOS1-1.

[0063] The first switch module may include a first switch unit 2111 and a second switch unit 2112, the control end of the first switch unit 2111 may be electrically connected to the first output interface D0_MOS1-1, the first end of the first switch unit 2111 may be grounded, the second end of the first switch unit 2111 may be electrically connected to the control end of the second switch unit 2112 and the control end of the first controlled switch 310, respectively, the first end of the second switch unit 2112 may be electrically connected to the control end of the third switch unit 2121 in the second switch module, the first end of the second switch unit 2112 may also be grounded, and the second end of the second switch unit 2112 may be electrically connected to the power supply;

[0064] The second switch module may include a third switch unit 2121 , a first end of the third switch unit 2121 may be grounded, and a second end of the third switch unit 2121 may be electrically connected to a control end of the second controlled switch 320 .

[0065] Here, the first switch unit 2111 , the second switch unit 2112 , and the third switch unit 2121 may all be MOSFETs.

[0066] Specifically, the control module 220 outputs a low level to the control end of the first switch unit 2111 through the first output interface D0_MOS1-1, so that the first end and the second end of the first switch unit 2111 are connected. In this way, the power supply, the control end of the first controlled switch 310, the third end of the first controlled switch 310, the first end of the first switch unit 2111, and the second end of the first switch unit 2111 form a loop, and current flows between the control end and the third end of the first controlled switch 310, so that the first controlled switch 310 can be closed, that is, the first end and the second end of the first controlled switch 310 are connected. In addition, the first end and the second end of the first switch unit 2111 are conductive, so that the control end of the second switch unit 2112 is at a low level, thereby conductive between the first end and the second end of the second switch unit 2112. In this way, the power supply, the first end of the second switch unit 2112, and the second end of the second switch unit 2112 form a loop, so that the control end of the third switch unit 2121 is at a low level, thereby conductive between the first end and the second end of the third switch unit 2121. The power supply, the control end of the second controlled switch 320, the third end of the second controlled switch 320, the first end of the third switch unit 2121, and the second end of the third switch unit 2121 form a loop, and current flows between the control end and the third end of the second controlled switch 320, thereby closing the second controlled switch 320, that is, conductive between the first end and the second end of the second controlled switch 320.

[0067] In the embodiment of the present application, cascade control between multiple switch modules can be achieved through the switch unit set in each switch module, so there is no need to control multiple controlled switches one by one, and there is no need for each controlled switch to occupy an output interface of the control module respectively.

[0068] In some embodiments of the present application, if the second switch module is not the last one of the multiple cascaded switch modules, the second switch module may include a third switch unit and a fourth switch unit, wherein the connection relationship of the fourth switch unit may be the same as the connection relationship of the second switch unit, which is not repeated here.

[0069] In some embodiments of the present application, Figure 4 As shown, at least one output interface of the control module 220 may further include a second output interface D0_MOS1-2, and the second output interface D0_MOS1-2 may be electrically connected to the control end of the third switch unit 2121.

[0070] Specifically, if the control module 220 outputs a low level through the first output interface D0_MOS1-1, the first controlled switch 310 and the controlled switches after the first controlled switch 310 can be controlled to be closed; if the control module 220 outputs a low level through the second output interface D0_MOS1-2, the second controlled switch 320 and the controlled switches after the second controlled switch 320 can be controlled to be closed.

[0071] In the embodiment of the present application, by connecting the multiple switch modules to the multiple output interfaces of the control module in a one-to-one correspondence, some of the multiple controlled switches can be flexibly controlled to be closed.

[0072] In some embodiments of the present application, Figure 5 As shown, the first switch module may further include: a first current limiting unit 2113 .

[0073] The first end of the first current limiting unit 2113 may be electrically connected to the second end of the first switch unit 2111 and the control end of the second switch unit 2112 , respectively, and the second end of the first current limiting unit 2113 may be electrically connected to a power source.

[0074] The first current limiting unit 2113 may be a device having a current limiting function. For example, the first current limiting unit 2113 may be a resistor.

[0075] The first end of the first current limiting unit 2113 is electrically connected to the second end of the first switch unit 2111 , and can limit the current flowing to the second end of the first switch unit 2111 to prevent the first switch unit 2111 from being broken down.

[0076] The first end of the first current limiting unit 2113 is electrically connected to the control end of the second switch unit 2112 , and can limit the current flowing to the control end of the second switch unit 2112 to prevent the second switch unit 2112 from being broken down.

[0077] In the embodiment of the present application, by setting the first end of the first current limiting unit to be electrically connected to the second end of the first switch unit and the control end of the second switch unit respectively, the first switch unit and the second switch unit can be prevented from being broken down.

[0078] In some embodiments of the present application, Figure 6 As shown, the first switch module may further include: a second current limiting unit 2114 .

[0079] The first end of the second current limiting unit 2114 can be electrically connected to the first end of the first current limiting unit 2113, the second end of the first switch unit 2111 and the control end of the first controlled switch 310 respectively, and the second end of the second current limiting unit 2114 can be electrically connected to the control end of the second switch unit 2112.

[0080] The second current limiting unit 2114 may be a device having a current limiting function. For example, the second current limiting unit 2114 may be a resistor.

[0081] The second end of the second current limiting unit 2114 is electrically connected to the control end of the second switch unit 2112 , and can limit the current flowing to the control end of the second switch unit 2112 to prevent the second switch unit 2112 from being broken down.

[0082] In addition, the first end of the second current limiting unit 2114 is electrically connected to the first end of the first current limiting unit 2113, so that the first current limiting unit 2113 and the second current limiting unit 2114 can jointly limit the current flowing to the control end of the second switch unit 2112, thereby better preventing the second switch unit 2112 from being broken down.

[0083] In the embodiment of the present application, by setting the first end of the second current limiting unit to be electrically connected to the first end of the first current limiting unit, and the second end of the second current limiting unit to be electrically connected to the control end of the second switch unit, the second switch unit can be prevented from being broken down.

[0084] In some embodiments of the present application, Figure 7 As shown, the first switch module may further include: a third current limiting unit 2115 .

[0085] A first end of the third current limiting unit 2115 may be electrically connected to a second end of the second switch unit 2112 , and a second end of the third current limiting unit 2115 may be electrically connected to a power source.

[0086] The third current limiting unit 2115 may be a device having a current limiting function. For example, the third current limiting unit 2115 may be a resistor.

[0087] The first end of the third current limiting unit 2115 is electrically connected to the second end of the second switch unit 2112 , and can limit the current flowing to the second end of the second switch unit 2112 to prevent the second switch unit 2112 from being broken down.

[0088] In the embodiment of the present application, by setting the first end of the third current limiting unit to be electrically connected to the second end of the second switch unit, the second switch unit can be prevented from being broken down.

[0089] In some embodiments of the present application, the second switch module may include a fifth current limiting unit, a sixth current limiting unit, and a seventh current limiting unit. The connection relationship of the fifth current limiting unit may be the same as the connection relationship of the first current limiting unit, the connection relationship of the sixth current limiting unit may be the same as the connection relationship of the second current limiting unit, and the connection relationship of the seventh current limiting unit may be the same as the connection relationship of the third current limiting unit, which will not be repeated here.

[0090] In some embodiments of the present application, Figure 8 As shown, the second switch module may further include: a fourth current limiting unit 2122 .

[0091] The first end of the fourth current limiting unit 2122 can be electrically connected to the first end and the second output interface of the second switch unit 2112 respectively, the second end of the fourth current limiting unit 2122 can be electrically connected to the control end of the third switch unit 2121, and the third end of the fourth current limiting unit 2122 is grounded.

[0092] The fourth current limiting unit 2122 may be a unit having a current limiting function.

[0093] The second end of the fourth current limiting unit 2122 is electrically connected to the control end of the third switch unit 2121 , and can limit the current flowing to the control end of the third switch unit 2121 to prevent the third switch unit 2121 from being broken down.

[0094] In the embodiment of the present application, by setting the second end of the fourth current limiting unit to be electrically connected to the control end of the third switch unit, the third switch unit can be prevented from being broken down.

[0095] In some embodiments of the present application, Fig. 9 As shown, the fourth current limiting unit 2122 may include: a current limiting subunit 21221 and a voltage dividing subunit 21222 .

[0096] The first end of the current limiting subunit 21221 can be electrically connected to the first end of the second switch unit 2112 and the second output interface respectively, and the second end of the current limiting subunit 21221 can be electrically connected to the first end of the voltage dividing subunit 21222 and the control end of the third switch unit 2121 respectively;

[0097] A first end of the voltage dividing subunit 21222 may be electrically connected to a control end of the third switch unit 2121 , and a second end of the voltage dividing subunit 21222 may be grounded.

[0098] The current limiting subunit 21221 may be a device having a current limiting function. For example, the current limiting subunit 21221 may be a resistor.

[0099] The second end of the current limiting subunit 21221 is electrically connected to the control end of the third switch unit 2121, which can limit the current flowing to the control end of the third switch unit 2121 to prevent the third switch unit 2121 from being broken down.

[0100] The voltage dividing subunit 21222 may be a device having a voltage dividing function. For example, the voltage dividing subunit 21222 may be a resistor.

[0101] The first end of the voltage divider unit 21222 is electrically connected to the control end of the third switch unit 2121 , and can reduce the voltage of the control end of the third switch unit 2121 by voltage division, thereby preventing the third switch unit 2121 from being broken down.

[0102] In the embodiment of the present application, by setting the second end of the current limiting subunit to be electrically connected to the control end of the third switch unit, and the first end of the voltage dividing subunit to be electrically connected to the control end of the third switch unit, the third switch unit can be prevented from being broken down.

[0103] In some embodiments of the present application, the first switch module may further include an eighth current limiting unit, and the connection relationship of the eighth current limiting unit may be the same as the connection relationship of the fourth current limiting unit, which will not be repeated here.

[0104] In some embodiments of the present application, Fig.10 As shown, the control module 220 may include: a control unit 221 and a decoder 222 .

[0105] Wherein, the output interface of the control unit 221 may be electrically connected to the input interface of the decoder 222;

[0106] The decoder 222 may have at least one output interface. Each output interface of the decoder 222 may be used to connect to a switch module respectively. Any output interface of the decoder 222 may be electrically connected to any switch module.

[0107] Exemplarily, each decoder 222 may have 8 output interfaces: a first output interface D0_MOS1-1, a second output interface D0_MOS1-2, a fourth output interface D0_MOS1-3, a fifth output interface D0_MOS1-4, a sixth output interface D0_MOS1-5, a seventh output interface D0_MOS1-6, an eighth output interface D0_MOS1-7 and a ninth output interface D0_MOS1-8.

[0108] The control module 220 may include one or more control units, and one or more decoders.

[0109] Exemplarily, the control unit 221 may be a microcontroller unit (MCU), and the decoder may be a 38 decoder.

[0110] Use the 3 IO interfaces of the MCU to control the 8 IO interfaces of the 38 decoder. According to different combinations of input signals, the 8 outputs of the 38 decoder will have different output states, which can control the 8 controlled switch drive signals.

[0111] In the embodiment of the present application, the IO interface of the MCU is expanded by using a 38 decoder, thereby avoiding insufficient IO interface of the MCU.

[0112] In order to better describe the whole scheme, based on the above embodiments, a specific example is given. Assuming that the first switch module is the first of the multiple switch modules in cascade, and the third switch module is the last of the multiple switch modules in the pole piece, the switch control circuit can be as follows: Fig.11 As shown, the switch control circuit may include: a control module 220, a first switch module, a second switch module and a third switch module.

[0113] The first switch module may include a first switch unit 2111 , a second switch unit 2112 , a first current limiting unit 2113 , a second current limiting unit 2114 and a third current limiting unit 2115 .

[0114] The second switch module may include a third switch unit 2121 , a fourth switch unit 2123 , a current limiting subunit 21221 , a voltage dividing subunit 21222 , a fifth current limiting unit 2124 , a sixth current limiting unit 2125 and a seventh current limiting unit 2126 .

[0115] The third switch module may include a fifth switch unit 2131 , a first current limiting subunit 21321 , a first voltage dividing subunit 21322 and a ninth current limiting unit 2133 .

[0116] The first output interface D0_MOS1-1 of the control module 220 is electrically connected to the control end of the first switch unit 2111 , the second output interface D0_MOS1-2 of the control module 220 is electrically connected to the control end of the third switch unit 2121 , and the third output interface D0_MOS1-N of the control module 220 is electrically connected to the first current limiting subunit 21321 .

[0117] Based on the same design concept, the present application also provides a test system 600, such as Fig.12 As shown, the test system 600 includes the test equipment 400 and the aforementioned switch control circuit 200 .

[0118] It can be understood that the test system has the beneficial effects of the switch control circuit provided in the embodiment of the present application, that is, the test system in the present application includes a plurality of cascaded switch modules and a control module, so the plurality of cascaded switch modules can be controlled by outputting a control signal through the control module. Since the plurality of switch modules are connected one-to-one with the control ends of the plurality of controlled switches, control of the plurality of controlled switches is achieved through a control signal, which not only reduces the number of output interfaces of the control module, but also eliminates the need to manually close the plurality of controlled switches one by one, and the operation is simple, efficient, and not prone to errors.

[0119] It should be noted that in the embodiments shown in the above figures, the resistor is represented by a single resistor, and the capacitor is represented by a single capacitor. In other embodiments, the resistor may be an integration of series, parallel or mixed resistors, and the capacitor may be an integration of series, parallel or mixed capacitors. The specific parameters of each device can be set according to actual needs, and this application does not limit this.

[0120] It should be understood that the specific structures of the circuits provided in the drawings of the embodiments of the present application are merely examples and are not intended to limit the present application. In addition, the above embodiments and features in the embodiments provided by the present application may be combined with each other if there is no contradiction.

[0121] It should be clear that each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. According to the embodiments described above in this application, these embodiments do not describe all the details in detail, nor do they limit the application to only the specific embodiments described. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the application, so that technicians in the relevant technical field can make good use of the application and the modified use based on the application. The application is only limited by the claims and their full scope and equivalents.

[0122] Those skilled in the art should understand that the above embodiments are exemplary rather than restrictive. Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Based on the study of the drawings, the specification and the claims, those skilled in the art should be able to understand and implement other variations of the disclosed embodiments. In the claims, the term "comprising" does not exclude other structures; the quantity involves "one" but does not exclude multiple; the terms "first" and "second" are used to indicate names rather than to indicate any specific order. Any figure marks in the claims should not be understood as limiting the scope of protection. The appearance of certain technical features in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

[0123] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A switch control circuit, characterized in that: include: A plurality of cascaded switch modules, wherein the output of the previous switch module in every two adjacent switch modules is the input of the next switch module, the plurality of switch modules are connected to the control ends of the plurality of controlled switches in a one-to-one correspondence, the first end of the controlled switch is electrically connected to the test equipment, the second end of the controlled switch is electrically connected to the device under test, and the third end of the controlled switch is electrically connected to the power supply; A control module, wherein the control module has at least one output interface, each output interface of the control module is used to connect to a switch module, and any output interface of the control module is electrically connected to any switch module.

2. The switch control circuit according to claim 1, characterized in that: Every two adjacent switch modules in the plurality of switch modules include a first switch module and a second switch module, the plurality of controlled switches include at least a first controlled switch and a second controlled switch, and the at least one output interface of the control module includes at least a first output interface; The first switch module comprises a first switch unit and a second switch unit, the control end of the first switch unit is electrically connected to the first output interface, the first end of the first switch unit is grounded, the second end of the first switch unit is electrically connected to the control end of the second switch unit and the control end of the first controlled switch respectively, the first end of the second switch unit is electrically connected to the control end of the third switch unit in the second switch module, the first end of the second switch unit is also grounded, and the second end of the second switch unit is electrically connected to a power supply; The second switch module includes the third switch unit, a first end of the third switch unit is grounded, and a second end of the third switch unit is electrically connected to the control end of the second controlled switch.

3. The switch control circuit according to claim 2, characterized in that: The at least one output interface of the control module further includes a second output interface, and the second output interface is electrically connected to the control end of the third switch unit.

4. The switch control circuit according to claim 2, characterized in that: The first switch module further includes: A first current limiting unit, wherein a first end of the first current limiting unit is electrically connected to a second end of the first switch unit and a control end of the second switch unit respectively, and a second end of the first current limiting unit is electrically connected to the power supply.

5. The switch control circuit according to claim 4, characterized in that: The first switch module further includes: A second current limiting unit, wherein the first end of the second current limiting unit is electrically connected to the first end of the first current limiting unit, the second end of the first switch unit and the control end of the first controlled switch, respectively, and the second end of the second current limiting unit is electrically connected to the control end of the second switch unit.

6. The switch control circuit according to claim 2, characterized in that: The first switch module further includes: A third current limiting unit, wherein a first end of the third current limiting unit is electrically connected to a second end of the second switch unit, and a second end of the third current limiting unit is electrically connected to the power supply.

7. The switch control circuit according to claim 3, characterized in that: The second switch module further includes: A fourth current limiting unit, wherein the first end of the fourth current limiting unit is electrically connected to the first end of the second switch unit and the second output interface respectively, the second end of the fourth current limiting unit is electrically connected to the control end of the third switch unit, and the third end of the fourth current limiting unit is grounded.

8. The switch control circuit according to claim 7, characterized in that: The fourth current limiting unit comprises: a current limiting subunit, wherein a first end of the current limiting subunit is electrically connected to a first end of the second switch unit and the second output interface respectively, and a second end of the current limiting subunit is electrically connected to a first end of the voltage dividing subunit and a control end of the third switch unit respectively; The voltage dividing subunit has a first end electrically connected to the control end of the third switch unit, and a second end of the voltage dividing subunit is grounded.

9. The switch control circuit according to any one of claims 1 to 8, characterized in that: The control module comprises: A control unit, wherein an output interface of the control unit is electrically connected to an input interface of the decoder; The decoder has at least one output interface, each output interface of the decoder is used to connect to a switch module, and any output interface of the decoder is electrically connected to any switch module.

10. A testing system, characterized in that: include: Testing equipment; as well as, A switch control circuit as claimed in any one of claims 1 to 9.

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