Stable switch circuit diagnosis system

What is AI technical title?
AI technical title is built by Patsnap AI team. It summarizes the technical point description of the patent document.
By setting redundant branches and multiple switching devices on the switching branch, and utilizing diagnostic and drive modules, the problem of the impact of switching device status and failure detection on system stability is solved, achieving the effect of accurate diagnosis and protection of components.

CN223857354UActive Publication Date: 2026-01-30SHANGHAI SAIC QINGTAO ENERGY TECH CO LTD

View PDF 0 Cites 0 Cited by

Patent Information

Application Number: CN202422585562.9
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-10-25
Publication Date: 2026-01-30
Estimated Expiration: 2034-10-25

AI Technical Summary

Technical Problem

In a parallel array of multiple switching devices, it is impossible to effectively detect the switching status and failure of the switching devices, and the detection process will affect the charging and discharging stability of the system.

Method used

By setting redundant branches and multiple switching devices on the switching branches, and using diagnostic and drive modules, the status and failure of the switching devices can be detected without affecting the stable operation of the system.

Benefits of technology

It enables accurate diagnosis of the switching status and failure conditions of switching components without affecting the system's charging and discharging stability, thus protecting components on other switching branches.

✦ Generated by Eureka AI based on patent content.

Smart Images

Figure CN223857354U_ABST

Patent Text Reader

Abstract

The utility model relates to the technical field of charging and discharging circuit safety, in particular to a stable switch circuit diagnosis system, which comprises a battery port, a load port, a redundancy branch and a plurality of switch branches, the first end of each switch branch is connected with the battery port, and the second end of each switch branch is connected with the load port; the first end of the redundant branch is connected with the battery port, and the second end of the redundant branch is connected with the load port; and the redundant branch is configured to form a current path between the battery port and the load port when at least one of the plurality of switch branches is disconnected. According to the utility model, the plurality of switch pieces are arranged on the switch branch, and the redundant branch is arranged, so that the on-off states of the switch pieces and the failure condition of the switch pieces are detected under the condition that the stable charging and discharging operation of the system is not influenced.

Need to check novelty before this filing date? Find Prior Art

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of charging and discharging circuit safety, particularly relates to a stable switching circuit diagnosis system. BACKGROUND

[0002] At present, in the application of the parallel array of multiple switching elements (relays, MOS tubes, etc.) as circuit switches, each switching element is in parallel. However, when part of the switching elements are open-circuit failure, and the switching elements on other parallel branches are in a closed state, the current borne by other parallel branches increases, increasing the risk of damage; when part of the switching elements are short-circuit failure, the entire switching loop cannot be effectively disconnected. Therefore, in order to solve the above problems, it is necessary to diagnose a single switching element to determine the damaged switching element. However, since the voltages of each parallel branch in the array are the same, it is impossible to determine the switching state of the switching element on the branch. Moreover, when detecting whether a switching element is faulty, open-circuit failure detection and short-circuit failure detection of the switching element are involved, and switching operation of the switching element is required, which also affects the stability of the current of each branch.

[0003] Therefore, how to detect the switching state of the switching element and the failure condition of the switching element without affecting the stable operation of the system charging and discharging is a technical problem that needs to be solved by those skilled in the art. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the above technical problems, the utility model provides a stable switching circuit diagnosis system, which sets multiple switching elements on the switching branch and sets a redundant branch to detect the switching state of the switching element and the failure condition of the switching element without affecting the stable operation of the system charging and discharging. The technical scheme of the utility model is as follows:

[0005] A stable switching circuit diagnosis system, comprising a battery port, a load port, a redundant branch and a plurality of switching branches;

[0006] The first end of each of the switching branches is connected to the battery port, and the second end of each of the switching branches is connected to the load port;

[0007] The first end of the redundant branch is connected to the battery port, and the second end of the redundant branch is connected to the load port;

[0008] The redundant branch is configured to form a current path between the battery port and the load port when at least one of the plurality of switching branches is open.

[0009] Preferably, each of the switching branches and the redundant branch comprises a plurality of switching elements connected in series.

[0010] Preferably, a driving module is further included; the driving module is connected to each of the switch branches and the redundant branch, and controls the on-off of each of the switch branches and the redundant branch.

[0011] Preferably, a diagnosis module is further included.

[0012] Each of the switch branches is provided with a diagnosis point.

[0013] The diagnosis module is electrically connected to the diagnosis point of each of the switch branches.

[0014] The diagnosis module is configured to diagnose the on-off state of the switch element in the switch branch corresponding to the diagnosis point.

[0015] Preferably, a diagnosis unit is further included, which is in communication connection with the diagnosis module and the driving module; wherein,

[0016] The diagnosis unit is configured to, after receiving a diagnosis signal, send a switch signal to the driving module, send a voltage detection signal to the diagnosis module, receive voltage information of the diagnosis module, and determine whether the detected switch element is faulty according to the voltage information and generate diagnosis result information.

[0017] The driving module is configured to, after receiving the switch signal, adjust the on-off of each switch element.

[0018] The diagnosis module is configured to, after receiving the voltage detection signal, detect the voltage of the diagnosis point, generate voltage information, and send the voltage information to the diagnosis unit.

[0019] Preferably, a logic control unit and an SPI interface are further included; wherein,

[0020] The logic control unit is configured to be in communication connection with the diagnosis unit, to send a diagnosis signal to the diagnosis unit and receive diagnosis result information of the diagnosis unit; be in communication connection with the driving module, to send a switch signal to the driving module; and be in communication connection with the SPI interface, to realize communication connection with an upper computer through the SPI interface and receive an instruction of the upper computer.

[0021] Preferably, a GPIO unit is further included, which is in communication connection with the logic control unit, and the logic control unit realizes communication connection with an external detection element through the GPIO unit, and the logic control unit is used to receive detection information of the external detection element and send a switch signal to the driving module according to the detection information.

[0022] Preferably, a first MOS tube and a second MOS tube are arranged in series on each of the switch branches and the redundant branch, the drain of the first MOS tube is connected to the drain of the second MOS tube, the source of the first MOS tube is connected to the battery port, and the source of the second MOS tube is connected to the load port.

[0023] Preferably, a first MOS tube and a second MOS tube are arranged in series on each of the switch branches and the redundant branch, the source of the first MOS tube is connected to the source of the second MOS tube, the drain of the first MOS tube is connected to the battery port, and the drain of the second MOS tube is connected to the load port.

[0024] Preferably, the gate of the first MOS tube and the gate of the second MOS tube are connected to the driving module.

[0025] The driving module is configured to control the opening and closing of the first MOS tube and the second MOS tube.

[0026] The utility model discloses the advantages are as follows:

[0027] By arranging a plurality of switch elements on the switch branch, when diagnosing one of the switch elements, the voltage across the switch element to be diagnosed can be changed by adjusting the switch state of the other switch elements, so that the state of the switch element can be diagnosed by the diagnosis module. In addition, the redundant branch is provided, and when diagnosing the switch element on one of the switch branches, the switch elements on the other switch branches and the redundant branch are closed, so that the other switch branches will not bear more current due to detection. Further, the switch state of the switch element and the failure condition of the switch element can be detected without affecting the stable operation of the system charging and discharging. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only one embodiment of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0029] Wherein, the same parts are indicated by the same reference numerals. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "bottom surface" and "top surface", "inner" and "outer" refer to the directions towards or away from the geometric center of a particular part.

[0030] Figure 1It is a structural schematic diagram of an embodiment of a stable switching circuit diagnosis system; as the drawing that can best illustrate the technical content of the utility model, the drawing is also designated as the abstract drawing; wherein, Figure 1 The dashed line in the drawing represents the switching branch used as a redundant branch; in addition, it should be noted that, in order to simplify the structure, Figure 1 Only two switching branches and one redundant branch are shown, but this does not mean that the corresponding switching branch of the stable circuit of the utility model can only be two, in actual application, facing different loads and scenes, the number of switching branches is not fixed, which is the common knowledge in the art.

[0031] Figure 2 It is another variant embodiment of the embodiment shown in Figure 1 Different from the embodiment of Figure 1 , the source of the discharge MOS tube and the charging MOS tube on each branch in Figure 2 is connected;

[0032] Figure 3 It is an expansion scheme of the embodiment shown in Figure 2

[0033] Figure 4 It is an optimization scheme of the embodiment shown in Figure 3

[0034] In the above drawings, each figure number mark represents:

[0035] 1, battery end;

[0036] 2, load end;

[0037] 3, switching branch;

[0038] 4, first MOS tube;

[0039] 5, second MOS tube;

[0040] 6, diagnosis point;

[0041] 7, voltage source;

[0042] 8, voltage detection device;

[0043] 9, multi-channel electronic switch;

[0044] 10, drive module; 10-1, drive unit; 10-2, latch unit;

[0045] 11, SPI interface;

[0046] 12, register;

[0047] 13, protection unit; 13-1, over-temperature comparison unit; 13-2, over-current comparison unit, 13-3, short-circuit comparison unit; 13-4, under-voltage comparison unit;

[0048] 14, GPIO unit;

[0049] 15, hardware over-current protection;

[0050] 16, logic control unit;

[0051] 17, external wake-up;

[0052] 18, redundant branch;

[0053] 19, diagnostic unit;

[0054] 20, host computer;

[0055] 21, external detection element;

[0056] Is, current source. DETAILED DESCRIPTION

[0057] The technical solutions of the present application will be described clearly and completely below in combination with the embodiments of the present application and the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0058] Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as those commonly understood by those skilled in the art to which the present application belongs; the terms used in the specific embodiments are only for the purpose of describing the specific embodiments, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0059] In the description of the specific 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 "a plurality of" is two or more, unless otherwise explicitly specified.

[0060] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0061] In the description of this utility model embodiment, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this utility model, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0062] The embodiments of the present invention will be described in more detail below through examples. It should be noted that the embodiments of the present invention are not limited to these examples.

[0063] Example 1

[0064] In a specific embodiment 1, such as Figure 1 As shown, a stabilization circuit for a switching branch includes a battery port 1, a load port 2, a redundant branch 18, and a plurality of switching branches 3. The first end of each switching branch 3 is connected to the battery port 1, and the second end of each switching branch 3 is connected to the load port 2. The first end of the redundant branch 18 is connected to the battery port 1, and the second end of the redundant branch 18 is connected to the load port 2. The redundant branch 18 is configured to form a current path between the battery port 1 and the load port 2 when at least one of the plurality of switching branches 3 is open-circuited.

[0065] In this embodiment, each switch branch 3 and redundant branch 18 includes several switches connected in series.

[0066] This embodiment is applied to circuits with multiple switch branches 3, each of which has multiple switches. When performing circuit diagnosis on a switch in a certain switch branch 3, the other switches in that switch branch 3 are disconnected, and the switches in other switch branches 3 are closed, keeping the other branches open. This allows the voltage across the switch to be diagnosed to change according to its own state, and the diagnostic module can then diagnose the state of the switch. Furthermore, during testing, the switches in the redundant branch 18 are also closed, ensuring that the number of closed switch branches 3 always meets the required number of branches. The current in other switch branches 3 will not increase due to the disconnection of the switch branch 3 containing the switch to be tested, thus preventing the components in these switch branches 3 from being affected.

[0067] Suppose the utility model originally needs 6 switch branches 3, when detecting the switch element on one of the switch branches 3, the switch branch 3 will be disconnected, so the number of the opened switch branches 3 becomes 5, but because the redundant branch 18 is added, the redundant branch 18 is in a closed state during detection, so that during detection, even if the switch branch 3 to be detected is disconnected, the switch branches 3 in the entire circuit are always 6. Therefore, other undetected switch branches 3 will not bear more current due to the disconnection of the switch branch 3 to be detected, thereby protecting the components on the switch branch 3.

[0068] As shown in Figure 1 , the embodiment also includes a diagnostic module, a diagnostic point 6 is arranged on each switch branch 3, and the diagnostic module is electrically connected to the diagnostic point 6 of each switch branch 3; the switch element is a MOS tube, a first MOS tube 4 and a second MOS tube 5 are arranged in series on each switch branch 3, and the diagnostic point 6 is arranged between the first MOS tube 4 and the second MOS tube 5. The diagnostic module is electrically connected to the diagnostic point 6 of each switch branch 3; the diagnostic module is arranged to diagnose the switch state of the switch element on the switch branch 3 corresponding to the diagnostic point 6. When diagnosing one of the MOS tubes, the switch state of the other MOS tubes can be adjusted to change the voltage across the MOS tube to be diagnosed, so that the state of the MOS tube is diagnosed by the diagnostic module.

[0069] Specifically, as shown in Figure 1 , the drain electrode of the first MOS tube 4 is electrically connected to the drain electrode of the second MOS tube 5, and the diagnostic point 6 is the connection point of the drain electrode of the first MOS tube 4 and the drain electrode of the second MOS tube 5. The source electrode of the first MOS tube 4 is connected to the battery end 1, and the source electrode of the second MOS tube 5 is connected to the load end 2.

[0070] In other embodiments, as shown in Figure 3 , the source electrode of the first MOS tube 4 is electrically connected to the source electrode of the second MOS tube 5, the diagnostic point 6 is arranged on the connection point of the source electrode of the first MOS tube 4 and the source electrode of the second MOS tube 5, the drain electrode of the first MOS tube 4 is connected to the battery end 1, and the drain electrode of the second MOS tube 5 is connected to the load end 2.

[0071] In some embodiments, the switch circuit diagnostic system further includes a driving module 10, a logic control unit 16, an SPI interface, and a GPIO unit 14.

[0072] The drive module 10 includes a drive unit 10-1 and a latch unit 10-2. The drive module 10 connects each switch branch 3 and the redundant branch 18, and controls the on / off state of each switch branch 3 and the redundant branch 18. Specifically, the gate of the first MOSFET 4 and the gate of the second MOSFET 5 on each switch branch 3 are connected to the drive module 10, and the drive module 10 is configured to drive several first MOSFETs 4 and second MOSFETs 5 to turn on or off.

[0073] like Figure 4 As shown, the switch circuit diagnostic system also includes a diagnostic unit 19, which is communicatively connected to both the diagnostic module and the drive module 10. The diagnostic unit 19 is configured to: receive a diagnostic signal, send a switch signal to the drive module 10, send a voltage detection signal to the diagnostic module, receive voltage information from the diagnostic module, and determine whether the detected switch is faulty based on the voltage information, generating diagnostic result information. The drive module 10 is configured to: adjust the opening or closing of each switch after receiving the switch signal. The diagnostic module is configured to: receive the voltage detection signal, detect the voltage at diagnostic point 6, generate voltage information, and send it to the diagnostic unit 19.

[0074] Specifically, the multi-channel electronic switch 9 and the voltage detection device 8 in the diagnostic module are both communicatively connected to the diagnostic unit 19. The multi-channel electronic switch 9 is configured to, upon receiving a voltage detection signal, conduct the electrical connection between the voltage source 7 and the diagnostic point 6 to be detected. The voltage detection device 8 is configured to, upon receiving a voltage detection signal, detect the voltage at the corresponding diagnostic point 6 and generate voltage information, which is then sent to the diagnostic unit 19.

[0075] In this embodiment, the logic control unit 16 is configured to: communicate with the diagnostic unit 19 to send diagnostic signals to the diagnostic unit 19 and receive diagnostic result information from the diagnostic unit 19; communicate with the drive module 10 to send switch signals to the drive module 10; and communicate with the SPI interface to achieve communication with the host computer 20 and receive instructions from the host computer 20.

[0076] In practical applications, the host computer 20 can send a detection command to the logic control unit 16. After receiving the detection command, the logic control unit 16 sends a diagnostic signal to the diagnostic unit 19, which in turn sends a number of voltage detection signals (corresponding to each switch) to the multi-channel electronic switch 9 and voltage detection device 8 in the diagnostic module. This enables fault detection of each switch.

[0077] In addition, the logic control unit 16 is communicatively connected to the drive module 10, so that the logic control unit 16 can send switching signals to the drive module 10 individually to control the opening or closing of each switch.

[0078] In the embodiment, the GPIO unit 14 is in communication connection with the logic control unit 16, the logic control unit 16 is in communication connection with the external detection element 21 through the GPIO unit 14, and the logic control unit 16 is used for receiving real-time detection information of the external detection element 21 and sending a switching signal to the driving module 10 according to the detection information.

[0079] Specifically, the external detection element 21 can be an NTC thermistor, the NTC thermistor can send temperature information (detection information) to the logic control unit 16 through the GPIO unit 14, so that the logic control unit 10 sends a switching signal to the driving module 10 according to the temperature information, so as to make the charge-discharge circuit open or conduct.

[0080] The embodiment is also provided with a register 12, a protection unit 13 and a hardware overcurrent protection 14. The protection unit 13 includes an over-temperature comparison unit 13-1, an over-current comparison unit 13-2, a short-circuit comparison unit 13-3 and an under-voltage comparison unit 13-4. In addition, an external wake-up 17 is also provided for wake-up input.

[0081] It should be pointed out that the above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A stable switching circuit diagnostic system characterized by, The battery port, the load port, the redundancy branch and a plurality of switch branches are included, The first end of each of the switch branches is connected with the battery port, and the second end of each of the switch branches is connected with the load port. The first end of the redundancy branch is connected with the battery port, and the second end of the redundancy branch is connected with the load port; the redundancy branch is configured to form a current path between the battery port and the load port when at least one of the plurality of switch branches is broken.

2. The stable switching circuit diagnostic system of claim 1, wherein, Each of the switch branches and the redundancy branch includes a plurality of switch elements connected in series.

3. The stable switching circuit diagnostic system of claim 2, wherein, A driving module is further included; the driving module is connected with each of the switch branches and the redundancy branch, and controls the on-off of each of the switch branches and the redundancy branch.

4. The stable switching circuit diagnostic system of claim 3, wherein, A diagnosis module is further included, and a diagnosis point is arranged on each of the switch branches; the diagnosis module is electrically connected with the diagnosis point of each of the switch branches; the diagnosis module is configured to diagnose the switch state of the switch element of the corresponding switch branch of the diagnosis point.

5. The stable switching circuit diagnostic system of claim 4, wherein, A diagnosis unit is further included, which is communicatively connected with the diagnosis module and the driving module; wherein, The diagnosis unit is configured to, after receiving a diagnosis signal, send a switch signal to the driving module, send a voltage detection signal to the diagnosis module, receive voltage information of the diagnosis module, judge whether the switch element is faulty according to the voltage information and generate diagnosis result information; The driving module is configured to, after receiving the switch signal, adjust the on or off of each of the switch elements; The diagnosis module is configured to, after receiving the voltage detection signal, detect the voltage of the diagnosis point and generate voltage information, and send the voltage information to the diagnosis unit.

6. The stable switching circuit diagnostic system of claim 5, wherein, A logic control unit and an SPI interface are further included; wherein, The logic control unit is configured to be communicatively connected with the diagnosis unit, to send a diagnosis signal to the diagnosis unit and receive diagnosis result information of the diagnosis unit; be communicatively connected with the driving module, to send a switch signal to the driving module; be communicatively connected with the SPI interface, to realize communication connection with an upper computer through the SPI interface and receive an instruction of the upper computer.

7. The stable switching circuit diagnostic system of claim 6, wherein, A GPIO unit is further included, which is communicatively connected with the logic control unit; the logic control unit realizes communication connection with an external detection element through the GPIO unit; the logic control unit is used to receive detection information of the external detection element and send a switch signal to the driving module according to the detection information.

8. The stable switching circuit diagnostic system according to any one of claims 3-7, wherein, A first MOS tube and a second MOS tube connected in series are arranged on each of the switch branches and the redundancy branch; the drain of the first MOS tube is connected with the drain of the second MOS tube; the source of the first MOS tube is connected with the battery port; and the source of the second MOS tube is connected with the load port.

9. The stable switching circuit diagnostic system according to any one of claims 3-7, wherein, A first MOS tube and a second MOS tube are connected in series on each of the switch branch and the redundant branch, the source of the first MOS tube is connected to the source of the second MOS tube, the drain of the first MOS tube is connected to the battery end, and the drain of the second MOS tube is connected to the load end.

10. The stable switching circuit diagnostic system of claim 8, wherein, The gate of the first MOS tube and the gate of the second MOS tube are connected to the driving module. The driving module is configured to control the opening or closing of the first MOS tube and the second MOS tube.