Drive diagnosis circuit, high-side drive circuit, and vehicle system

Abstract

The utility model discloses a driving diagnosis circuit, a high-side driving circuit and a vehicle system.The driving diagnosis circuit is provided with a first detection module at the output end of a driving circuit, and the first detection module can detect signals of the output end of the driving circuit under the condition that output is enabled and the signal of the output end of the driving circuit under the condition that output is not enabled; the control module determines which fault exists at the output end of the driving circuit according to the magnitude of the detection voltage output by the detection module, and outputs a corresponding diagnosis signal, so that the fault of the driving circuit or the output end of the driving circuit can be diagnosed, and a diagnosis result can be continuously output in the working process of the driving circuit. And the reliability of the driving circuit and the post-stage circuit is improved.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a drive diagnosis circuit, a high-side drive circuit and a vehicle system. Background Art

[0002] In electronic design applications, an important and common method is that the high-side driver circuit supplies power to an external remote load, and the other end of the remote load is permanently connected to the device ground. The output end of the high-side driver circuit is connected to the remote load through a wiring harness. As the use time increases, the wiring harness will be damaged, causing the positive pole of the power line in the high-side driver circuit to short-circuit with the ground line, or the positive and negative poles of the power line to short-circuit, thereby causing damage to the equipment. Utility Model Content

[0003] In view of the above problems, the present application provides a drive diagnosis circuit, a high-side drive circuit and a vehicle system, which can solve the problem that the output end of the current drive circuit cannot be diagnosed due to faults and has poor reliability.

[0004] A first aspect of an embodiment of the present application provides a driving diagnosis circuit connected to a driving circuit, wherein the driving diagnosis circuit includes a control module and a first detection module;

[0005] The control module is connected to the driving circuit and the first detection module, and is used to enable the driving circuit to output a driving signal, or to disable the driving circuit to stop outputting the driving signal;

[0006] The first detection module is connected to the control module and the output end of the drive circuit, and is used to detect the output of the output end of the drive circuit to generate a detection voltage;

[0007] The control module is configured with a function of performing fault diagnosis on the output end of the drive circuit based on the enabled state of the drive circuit and the magnitude of the detection voltage.

[0008] In the technical solution of the embodiment of the present application, by setting a first detection module at the output end of the driving circuit, the signal of the output end of the driving circuit when the output is enabled and when the output is not enabled can be detected respectively. The control module determines what kind of fault exists at the output end of the driving circuit according to the size of the detection voltage output by the detection module, and outputs a corresponding diagnostic signal. In this way, the fault of the driving circuit itself or its output end can be diagnosed, and the diagnostic result can be continuously output during the operation of the driving circuit, thereby improving the reliability of the driving circuit and the subsequent circuit.

[0009] In some embodiments, a second detection module is further included, wherein the second detection module is connected to the power supply, the control module and the output end of the drive circuit;

[0010] When the second detection module is turned on, the power supply provides a power supply voltage to the output end of the driving circuit based on the power supply;

[0011] The control module is further configured with a function of performing fault diagnosis on the output end of the drive circuit based on disabling the drive circuit and enabling the second detection module to be turned on.

[0012] In the technical solution of the embodiment of the present application, the control module can also be used to disable the driving circuit to stop outputting the driving signal, and enable the second detection module outside the driving circuit to supply power to the output end of the driving circuit. When the driving circuit is turned off and the driving circuit is excluded, it is possible to diagnose whether there is a fault in the output end of the driving circuit, thereby improving the accuracy of fault detection.

[0013] In some embodiments, the second detection module includes a first switch unit and a second switch unit;

[0014] The first switch unit is connected between the power supply and the output end of the drive circuit, the second switch unit is connected to the control end of the switch unit, the control end of the second switch unit is connected to the control module, and the control module is used to output an enable signal to enable the second switch unit to drive the first switch unit to turn on.

[0015] In the technical solution of the embodiment of the present application, two switching circuits are used to control the power supply to supply power to the output end of the driving circuit, and a diagnostic power supply is provided when the driving circuit is excluded, thereby improving the accuracy of fault detection.

[0016] In some embodiments, the first switch unit includes a first switch tube, a first resistor, a second resistor and a third resistor.

[0017] The first end of the first switch tube is connected to the power supply, the second end of the first switch tube is connected to the output end of the drive circuit through the first resistor, the second resistor is connected between the first end and the control end of the first switch tube, and the control end of the first switch tube is connected to the second switch unit through the third resistor.

[0018] In the technical solution of the embodiment of the present application, a simple and reliable implementation method of the first switch unit is provided.

[0019] In some embodiments, the second switch unit includes a second switch tube, a fourth resistor and a fifth resistor;

[0020] The first end of the second switch tube is connected to the third resistor, the second end of the second switch tube is grounded, the fourth resistor is connected between the control end and the second end of the second switch tube, and the control end of the second switch tube is connected to the control module through the fifth resistor.

[0021] In the technical solution of the embodiment of the present application, a simple and reliable implementation method of the second switch unit is provided.

[0022] In some embodiments, the first detection module includes a first voltage divider and a second voltage divider, the first end of the first voltage divider is connected to the output end of the driving circuit, the second end of the first voltage divider and the first end of the second voltage divider are connected together to form the output end of the first detection module connected to the control module, and the second end of the second voltage divider is grounded.

[0023] In the technical solution of the embodiment of the present application, a simple and reliable implementation method of the first detection module is provided.

[0024] In some embodiments, the fault includes a short circuit to ground fault and a short circuit to battery fault;

[0025] The control module includes an analog-to-digital conversion unit and a control unit, the analog-to-digital conversion unit is connected to the first detection module, the analog-to-digital conversion unit is used to convert the detection voltage into a voltage value, and the control unit is connected to the analog-to-digital conversion unit and the driving circuit;

[0026] The control unit is configured with:

[0027] Based on enabling the drive circuit to output a drive signal and the voltage value being less than a first voltage value, diagnosing that the output terminal of the drive circuit is short-circuited to ground; and

[0028] Based on the switching of enabling the drive circuit to output the drive signal to disabling the drive circuit, and the voltage value being greater than a second voltage value, diagnosing that the output end of the drive circuit is short-circuited to the battery;

[0029] Wherein, the first pressure value is smaller than the second pressure value.

[0030] In the technical solution of the embodiment of the present application, corresponding diagnosis is made for the two situations of the driving circuit when the output is enabled and when the output is not enabled, and the diagnosis result can be continuously output during the operation of the driving circuit.

[0031] In some embodiments, the control unit is further connected to the second detection module;

[0032] The control unit is also configured with:

[0033] Based on disabling the drive circuit and enabling the second detection module to be turned on, when the voltage value is less than the first voltage value, the output end of the drive circuit is diagnosed as having a short circuit fault to the ground; when the voltage value is greater than the second voltage value, the output end of the drive circuit is diagnosed as having a short circuit fault to the battery.

[0034] In the technical solution of the embodiment of the present application, when the driving circuit is turned off, power is supplied to the output end of the driving circuit based on the first detection module, and a fault diagnosis is performed on the output end of the driving circuit alone.

[0035] A second aspect of an embodiment of the present application provides a high-side driving circuit, comprising a high-side driving circuit and the driving diagnostic circuit as described above, wherein the driving diagnostic circuit is connected to the high-side driving circuit.

[0036] In the technical solution of the embodiment of the present application, a high-side driving circuit is externally provided with a driving diagnosis circuit, which improves the reliability of the high-side driving circuit.

[0037] A third aspect of an embodiment of the present application provides a vehicle system, which includes the drive diagnostic circuit as described above; or, includes the high-side drive circuit as described above.

[0038] In the technical solution of the embodiment of the present application, the reliability of the vehicle system including the above-mentioned drive diagnosis circuit or the above-mentioned high-side drive circuit is improved.

[0039] 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

[0040] 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:

[0041] Figure 1 A schematic diagram of the structure of a drive diagnosis circuit provided in some embodiments of the present application;

[0042] Figure 2 A schematic diagram of the structure of a drive diagnosis circuit provided in some embodiments of the present application;

[0043] Figure 3 A circuit diagram of a drive diagnostic circuit provided in some embodiments of the present application. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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.

[0047] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The phrase "second connection port" at 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.

[0048] 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.

[0049] In the description of the embodiments of the present application, the term "multi-frame" refers to more than two (including two).

[0050] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0051] In vehicle systems, an important and common method is that the high-side driver circuit supplies power to the remote load, and the other end of the remote load is permanently connected to the vehicle body ground. The output end of the high-side driver circuit is connected to the remote load through a wiring harness. As the use time increases, the high-side driver circuit is damaged or the wiring harness is damaged, causing the high-side driver circuit to fail. If it continues to be used, it will cause damage to the equipment on the vehicle.

[0052] In order to solve the above technical problems, the embodiments of the present application provide a drive diagnosis circuit for detecting a fault in a drive circuit or its output terminal (such as a wiring harness). Figure 1 , Figure 1 The schematic diagram of the structure of the driving diagnosis circuit 100 provided in some embodiments of the present application. The driving diagnosis circuit 100 is connected to the driving circuit 200, and the driving diagnosis circuit 100 includes a control module 110 and a first detection module 120;

[0053] The control module 110 is connected to the drive circuit 200 and the first detection module 120, and is used to enable the drive circuit 200 to output the drive signal Vo, or to disable the drive circuit 200 to stop outputting the drive signal Vo; the first detection module 120 is connected to the control module 110 and the output end of the drive circuit 200, and is used to detect the output of the output end of the drive circuit 200 to generate a detection voltage V1; the control module 110 is configured with a function of performing fault diagnosis on the output end of the drive circuit 200 based on the enabled state of the drive circuit 200 and the size of the detection voltage V1.

[0054] The fault of the output end of the driving circuit 200 includes a short to ground (STG) fault or a short to battery (STB) fault, or even an overload fault.

[0055] The driving circuit 200 is, for example, a high-side driving (discrete) circuit or an integrated circuit. The control module 110 can be a separate circuit module, or divided into a first part module connected to the driving circuit 200 and a second part module connected to the detection module 120, and the first and second parts modules can communicate with each other. The first detection module 120, for example, divides the output signal of the driving circuit 200 and outputs the voltage component as the detection voltage V1. The diagnostic signal can be an instruction output to the outside, or light up an indicator light of a corresponding color, etc.

[0056] In the technical solution of the embodiment of the present application, during the operation of the driving circuit 200, the first detection module 120 can respectively detect the detection voltage V1 of the output end of the driving circuit 200 when the output is enabled and when the output is not enabled, and the control module 110 determines the fault of the output end of the driving circuit 200 according to the size of the detection voltage V1 output by the detection module, and outputs a corresponding diagnostic signal. In this way, the fault of the driving circuit 200 itself or its output end can be diagnosed, and the diagnostic result can be continuously output during the operation of the driving circuit 200, thereby improving the reliability of the driving circuit 200 and the subsequent circuit.

[0057] In some embodiments, the control module 110 includes an analog-to-digital conversion unit (not shown) and a control unit (not shown), the analog-to-digital conversion unit is connected to the first detection module 120, the analog-to-digital conversion unit is used to convert the detection voltage V1 into a voltage value, and the control unit is connected to the analog-to-digital conversion unit and the driving circuit 200;

[0058] The control unit is equipped with:

[0059] Based on enabling the driving circuit 200 to output the driving signal Vo and the voltage value being less than the first voltage value, diagnosing that the output terminal of the driving circuit 200 is short-circuited to ground; and

[0060] Based on the enable drive circuit 200 outputting the drive signal Vo switching to disable the drive circuit 200, and the voltage value being greater than the second voltage value, the output end of the diagnosis drive circuit 200 is a function of a battery short circuit fault; wherein the first voltage value is less than the second voltage value.

[0061] The control module 110 may be a microcontroller unit (MCU), and the analog-to-digital conversion unit may be built-in or external to the MCU. The control unit is the computing unit of the MCU.

[0062] For example, the drive signal Vo output by the drive circuit 200 is 12V, the first voltage value is 0.1V, and the second voltage value is 6V. When the drive circuit 200 is enabled to output the drive signal Vo, the control module 110 detects that the voltage value of the output end of the drive circuit 200 is lower than 0.1V according to the detection voltage output by the first detection module 120, and it is considered that the output end of the drive circuit 200 has an STG fault in the internal or external wiring harness of the drive circuit 200. When the drive circuit 200 is not enabled to output the drive signal Vo, the control module 110 detects that the voltage value of the output end of the drive circuit 200 is higher than 6V according to the detection voltage output by the first detection module 120, and it is considered that the output end of the drive circuit 200 has an STB fault in the internal or external wiring harness of the drive circuit 200.

[0063] In this way, corresponding diagnosis is made for the driving circuit 200 in the two situations of enabling output and disabling output respectively, and the diagnosis result can be continuously output during the operation of the driving circuit 200.

[0064] Please refer to Figure 2 , Figure 2 The schematic diagram of the structure of the drive diagnosis circuit 100 provided in some embodiments of the present application is shown in FIG. In some embodiments, the drive diagnosis circuit 100 further includes a second detection module 130 , which is connected to the power supply, the control module 110 and the output end of the drive circuit 200 .

[0065] When the second detection module 130 is turned on, a power supply voltage is provided to the output end of the driving circuit 200 based on the power supply Vcc;

[0066] The control module 110 is also configured with a function of performing a fault diagnosis on the output end of the driving circuit 200 based on disabling the driving circuit 200 and enabling the second detection module 130 to be turned on.

[0067] The second detection module 130 is used to provide power to the output end of the drive circuit 200 so that the first detection module 120 continues to perform active detection when the output of the drive circuit 200 is turned off. In this way, when the internal fault of the drive circuit 200 is eliminated, it is diagnosed whether the wiring harness connected to the output end of the drive circuit 200 is faulty, thereby improving the accuracy of fault detection.

[0068] In some embodiments, the control module 110 or its control unit is also connected to the second detection module 130; the control module 110 or its control unit is also configured: based on disabling the drive circuit 200 and enabling the second detection module 130 to be turned on, when the voltage value is less than the first voltage value, the output end of the drive circuit 200 is diagnosed as a short circuit fault to ground; when the voltage value is greater than the second voltage value, the output end of the drive circuit 200 is diagnosed as a short circuit fault to the battery.

[0069] For example, the output voltage of the power supply is 12V, the first voltage value is 0.1V, and the second voltage value is 6V. When the drive circuit 200 is not enabled to output the drive signal Vo, and the second detection module 130 is enabled and turned on, the control module 110 detects that the voltage value of the output end of the drive circuit 200 is lower than 0.1V according to the detection voltage output by the first detection module 120, and it is considered that the output end of the drive circuit 200 has an STG fault; if it is detected that the voltage value of the output end of the drive circuit 200 is higher than 6V, it is considered that the output end of the drive circuit 200 has an STB fault.

[0070] In this way, when the driving circuit 200 is turned off, the output end of the driving circuit 200 is powered based on the first detection module 120, and a fault diagnosis is performed on the output end of the driving circuit 200 alone.

[0071] Please refer to Figure 3 , Figure 3 The following is a circuit diagram of a drive diagnosis circuit 100 provided in some embodiments of the present application. Figure 2 and Figure 3 In some embodiments, the second detection module 130 includes a first switch unit 131 and a second switch unit 132 .

[0072] The first switch unit 131 is connected between the power supply Vcc and the output end of the driving circuit 200, the first end of the second switch unit 132 is connected to the control end of the first switch unit 131, the second end of the second switch unit 132 is grounded, and the control end of the second switch unit 132 is connected to the enable end of the control module 110. The control module 110 is used to output an enable signal EN2 to enable the second switch unit 132 to drive the first switch unit 131 to turn on.

[0073] In the technical solution of the embodiment of the present application, two switch circuits are used to control the power supply Vcc to supply power to the output end of the driving circuit 200, and to provide a diagnostic power supply when the driving circuit 200 is excluded, thereby improving the accuracy of fault detection.

[0074] It is understandable that, in some cases, the second switch unit 132 may be omitted, and the first switch unit 131 is directly connected to the enable terminal of the control module 110 , and the control module 110 is used to output the enable signal EN2 to enable the first switch unit 131 to be turned on.

[0075] Please refer to Figure 3 In some embodiments, the first switch unit 131 includes a first switch tube Q1, a first resistor R1, a second resistor R2 and a third resistor R3.

[0076] The first end of the first switch tube Q1 is connected to the power supply Vcc, the second end of the first switch tube Q1 is connected to the output end of the driving circuit 200 through the first resistor R1, the second resistor R2 is connected between the first end and the control end of the first switch tube Q1, and the control end of the first switch tube Q1 is connected to the second switch unit 132 through the third resistor R3.

[0077] The first switch tube Q1 is a PNP transistor, and the emitter, collector and base of the PNP transistor respectively constitute the first end, the second end and the control end of the first switch tube Q1. When the PNP transistor is turned on, the first resistor R1 and the first detection module 120 form a voltage divider network.

[0078] In the technical solution of the embodiment of the present application, a simple and reliable implementation of the first switch unit 131 is provided.

[0079] Please refer to Figure 3 In some embodiments, the second switch unit 132 includes a second switch tube Q2, a fourth resistor R4 and a fifth resistor R5.

[0080] The first end of the second switch tube Q2 is connected to the control end of the first switch tube Q1 through the third resistor R3, the second end of the second switch tube Q2 is grounded, the fourth resistor R4 is connected between the control end and the second end of the second switch tube Q2, and the control end of the second switch tube Q2 is connected to the enable end of the control module 110 through the fifth resistor R5.

[0081] Among them, the second switch tube Q2 is an NPN triode, and the collector, emitter, and base of the NPN triode constitute the first end, the second end, and the control end of the second switch tube Q2 respectively. The enable end of the control module 110 outputs a high-level enable signal EN2 to enable the second switch tube Q2 to be turned on. The base of the second switch tube Q2 is pulled down to the ground and then turned on, and the voltage of the power supply Vcc is loaded to the output end of the drive circuit 200 through the first resistor R1. When the output of the drive circuit 200 is turned off, a voltage is provided to the output end of the drive circuit 200 so that the first detection module 120 continues to perform active detection. A simple and reliable implementation method of the second switch unit 132 is provided.

[0082] Please refer to Figure 3 In some embodiments, the first detection module 120 includes a first voltage divider R11 and a second voltage divider R12, the first end of the first voltage divider R11 is connected to the output end of the driving circuit 200, the second end of the first voltage divider R11 and the first end of the second voltage divider R12 are connected together to form the output end of the first detection module 120 connected to the control module 110, and the second end of the second voltage divider R12 is grounded.

[0083] It is understandable that the first voltage divider R11 and the second voltage divider R12 include a circuit composed of one or more components such as a resistor, a capacitor, and a semiconductor device. The first voltage divider R11 and the second voltage divider R12 are used to divide the voltage at the output end of the driving circuit 200, and output the voltage component as the detection voltage V1 to the control module 110. A simple and reliable implementation of the first detection module 120 is provided.

[0084] A second aspect of an embodiment of the present application provides a high-side driving circuit, including a high-side driving circuit and the above-mentioned driving diagnosis circuit 100 , wherein the driving diagnosis circuit 100 is connected to the high-side driving circuit.

[0085] The high-side drive circuit is constructed by discrete circuits or integrated circuits. After the high-side drive circuit is equipped with the drive diagnosis circuit 100 of any of the above embodiments, the drive diagnosis circuit 100 provides multiple fault diagnosis functions for the high-side drive circuit, thereby improving the reliability of the high-side drive circuit.

[0086] A third aspect of an embodiment of the present application provides a vehicle system, the vehicle system includes the above drive diagnosis circuit 100; or, includes the above high-side drive circuit.

[0087] In the technical solution of the embodiment of the present application, the reliability of the vehicle system including the above drive diagnosis circuit 100 or the above high-side drive circuit is improved.

[0088] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0089] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0090] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the electronic device embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0091] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0092] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0093] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A drive diagnosis circuit, characterized in that: connected to the driving circuit, the driving diagnosis circuit includes a control module and a first detection module; The control module is connected to the driving circuit and the first detection module, and is used to enable the driving circuit to output a driving signal, or to disable the driving circuit to stop outputting the driving signal; The first detection module is connected to the control module and the output end of the drive circuit, and is used to detect the output of the output end of the drive circuit to generate a detection voltage; The control module is configured with a function of performing fault diagnosis on the output end of the drive circuit based on the enabled state of the drive circuit and the magnitude of the detection voltage.

2. The drive diagnosis circuit according to claim 1, characterized in that: It also includes a second detection module, which is connected to the power supply, the control module and the output end of the drive circuit; When the second detection module is turned on, the power supply voltage is provided to the output end of the driving circuit based on the power supply; The control module is further configured with a function of performing fault diagnosis on the output end of the drive circuit based on disabling the drive circuit and enabling the second detection module to be turned on.

3. The drive diagnosis circuit according to claim 2, characterized in that: The second detection module includes a first switch unit and a second switch unit; The first switch unit is connected between the power supply and the output end of the drive circuit, the second switch unit is connected to the control end of the first switch unit, the control end of the second switch unit is connected to the control module, and the control module is used to output an enable signal to enable the second switch unit to drive the first switch unit to turn on.

4. The drive diagnosis circuit according to claim 3, characterized in that: The first switch unit includes a first switch tube, a first resistor, a second resistor and a third resistor. The first end of the first switch tube is connected to the power supply, the second end of the first switch tube is connected to the output end of the drive circuit through the first resistor, the second resistor is connected between the first end and the control end of the first switch tube, and the control end of the first switch tube is connected to the second switch unit through the third resistor.

5. The drive diagnosis circuit according to claim 4, characterized in that: The second switch unit includes a second switch tube, a fourth resistor and a fifth resistor; The first end of the second switch tube is connected to the third resistor, the second end of the second switch tube is grounded, the fourth resistor is connected between the control end and the second end of the second switch tube, and the control end of the second switch tube is connected to the control module through the fifth resistor.

6. The drive diagnosis circuit according to claim 2, characterized in that: The first detection module includes a first voltage divider and a second voltage divider, the first end of the first voltage divider is connected to the output end of the driving circuit, the second end of the first voltage divider and the first end of the second voltage divider are connected together to form the output end of the first detection module connected to the control module, and the second end of the second voltage divider is grounded.

7. The drive diagnosis circuit according to any one of claims 2 to 6, characterized in that: The faults include short circuit to ground fault and short circuit to battery fault; The control module includes an analog-to-digital conversion unit and a control unit, the analog-to-digital conversion unit is connected to the first detection module, the analog-to-digital conversion unit is used to convert the detection voltage into a voltage value, and the control unit is connected to the analog-to-digital conversion unit and the driving circuit; The control unit is configured with: Based on enabling the drive circuit to output a drive signal and the voltage value being less than a first voltage value, diagnosing that the output terminal of the drive circuit is short-circuited to ground; and Based on the switching of enabling the drive circuit to output the drive signal to disabling the drive circuit, and the voltage value being greater than a second voltage value, diagnosing that the output end of the drive circuit is short-circuited to the battery; Wherein, the first pressure value is smaller than the second pressure value.

8. The drive diagnosis circuit according to claim 7, characterized in that: The control unit is also connected to the second detection module; The control unit is also configured with: Based on disabling the drive circuit and enabling the second detection module to be turned on, when the voltage value is less than the first voltage value, the output end of the drive circuit is diagnosed as having a short circuit fault to the ground; when the voltage value is greater than the second voltage value, the output end of the drive circuit is diagnosed as having a short circuit fault to the battery.

9. A high-side drive circuit, characterized in that: The invention comprises a high-side driving circuit and a driving diagnosis circuit as claimed in any one of claims 1 to 8, wherein the driving diagnosis circuit is connected to the high-side driving circuit.

10. A vehicle system, characterized in that: The vehicle system comprises the drive diagnosis circuit according to any one of claims 1 to 8; or, comprises the high-side drive circuit according to claim 9.

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