Self-checking protection method and device based on H-bridge cascade topology circuit

Abstract

The invention provides a self-checking protection method and device based on an H-bridge cascade topology circuit, and the method comprises the steps: firstly, successively obtaining an output voltage between a power supply and a power supply bus through a voltage collection module, so as to carry out the detection and output state confirmation of the voltage output states of the power supply and the power supply bus; after the output states of the power supply and the power supply bus are determined to be normal, the H-bridge module is driven to switch between different output states, and the voltage acquisition module is used to acquire the output voltage of the intermediate node of the two bridge arms of the H-bridge module. Therefore, whether the driving state abnormity and the output state abnormity exist in the H-bridge module can be rapidly detected and judged. According to the method and the device, the fault position and the fault reason of the circuit can be quickly confirmed before the H-bridge cascade topology circuit is electrified, so that the maintenance convenience, the use safety and the use stability of the H-bridge cascade topology circuit are improved.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a self-checking protection method and device based on an H-bridge cascade topology circuit. Background Art

[0002] With the development of power electronics technology, H-bridge circuits have been widely used, for example, energy storage circuits based on H-bridge cascades, multi-level inverters based on H-bridge cascades, etc., collectively referred to as multi-level topology circuits based on H-bridge cascades.

[0003] Many groups of power switch devices are used in multi-level topology circuits based on H-bridge cascades. The opening and closing control of these power switch devices requires the core controller to send signals uniformly for control. Sometimes a topology circuit requires many H-bridge cascades, so the entire circuit system is relatively large. The more control loops there are in the entire circuit system, the more power switch tubes are used. However, there are strict conditions for the packaging, transportation, storage, welding and other links of the power switch tube. If any link does not meet the requirements, the power switch tube will be internally damaged, and this damage is difficult to determine through simple instrument measurement. Installing it on the equipment will bring stability risks, which may cause equipment failure and shutdown at the least, or equipment damage and economic losses at the worst. Some power tubes are damaged during transportation or welding. If no abnormality is found before or during use, it will cause the entire circuit system to be abnormal.

[0004] Therefore, how to provide a self-detection protection method and device based on an H-bridge cascade topology circuit, which can perform protective detection on the damage condition of each power control loop and the accuracy of the output before or when the H-bridge cascade topology circuit is turned on and used, and improve the safety of use and output stability of the H-bridge cascade topology circuit, has become a technical problem that people in this field urgently need to solve. Summary of the invention

[0005] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0006] To this end, the first purpose of the present application is to propose a self-detection protection method and device based on an H-bridge cascade topology circuit, which can perform protective detection on the damage condition of each power control loop and the accuracy of the output before or when the H-bridge cascade topology circuit is turned on, thereby improving the safety of use and output stability of the H-bridge cascade topology circuit.

[0007] To achieve the above-mentioned purpose, the first aspect of the present application proposes a self-checking protection method based on an H-bridge cascade topology circuit, wherein the H-bridge cascade topology circuit includes a power supply, a power supply bus, an H-bridge module and a voltage acquisition module; the H-bridge module includes a first power switch, a second power switch, a third power switch and a fourth power switch, the first power switch and the second power switch are connected in series through a first node to form a first bridge arm, and the third power switch and the fourth power switch are connected in series through a second node to form a second bridge arm; the method includes:

[0008] Connecting the voltage acquisition module to the power supply, and acquiring the output voltage of the power supply to detect whether the output state of the power supply is normal;

[0009] When the output state of the power supply is normal, the power supply is driven to supply power to the power supply bus, and the voltage acquisition module is connected to the power supply bus, and the output voltage of the power supply bus when the H-bridge module is in the initial state is acquired to detect whether the output state of the power supply bus is normal;

[0010] When the output state of the power supply bus is normal, the voltage acquisition module is connected to the first node and the second node respectively, and the output voltages of the first node and the second node of the H-bridge module in different driving states are collected to detect whether the output state and the driving state of the H-bridge module are normal.

[0011] Optionally, the driving state of the H-bridge module includes at least an initial state, a first state, a second state, a third state and a fourth state; wherein,

[0012] When the H-bridge module is in an initial state, the first power switch, the second power switch, the third power switch and the fourth power switch are simultaneously in an off state;

[0013] When the H-bridge module is in the first state, the first power switch and the third power switch are in the on state, and the second power switch and the fourth power switch are in the off state;

[0014] When the H-bridge module is in the second state, the second power switch and the fourth power switch are in the on state, and the first power switch and the third power switch are in the off state;

[0015] When the H-bridge module is in the third state, the first power switch and the fourth power switch are in the on state, and the second power switch and the third power switch are in the off state;

[0016] When the H-bridge module is in the fourth state, the second power switch and the third power switch are in the on state, and the first power switch and the fourth power switch are in the off state.

[0017] Optionally, the step of collecting the output voltages of the first node and the second node of the H-bridge module in different driving states includes:

[0018] Driving the H-bridge module to be in the initial state, and detecting the output state of the H-bridge module according to the acquisition results of the output voltages of the first node and the second node respectively by the voltage acquisition module;

[0019] The H-bridge module is driven to switch between the first state, the second state, the third state and the fourth state, and the driving state of the H-bridge module is detected according to the acquisition results of the output voltages of the first node and the second node respectively by the voltage acquisition module in the corresponding state.

[0020] Optionally, when the H-bridge module is in the initial state, and the output voltage of the first node is equal to the output voltage of the second node and is consistent with half of the output voltage of the power supply bus, the output state of the H-bridge module is normal.

[0021] Optionally, when the H-bridge module is in the first state, and the output voltage of the first node is equal to the output voltage of the second node and is consistent with the output voltage of the power supply bus, or,

[0022] When the H-bridge module is in the second state, and the output voltage of the first node and the output voltage of the second node both tend to zero, or,

[0023] When the H-bridge module is in the third state, the output voltage of the first node is consistent with the output voltage of the power supply bus, and the output voltage of the second node tends to zero, or,

[0024] When the H-bridge module is in the fourth state, the output voltage of the second node is consistent with the output voltage of the power supply bus, and the output voltage of the first node tends to zero, the driving state and output state of the H-bridge module are normal.

[0025] Optionally, a first switch unit and a second switch unit connected in parallel are further included between the power supply and the power supply bus, the first switch unit is turned on when the output state of the power supply is normal, and the second switch unit is turned on when the output state and driving state of the H-bridge module are normal.

[0026] Optionally, the H-bridge cascade topology circuit also includes a control module, and multiple output ends of the control module are respectively connected to the first power switch, the second power switch, the third power switch, the fourth power switch, the first switch unit and the second switch unit in a one-to-one correspondence to respectively drive the first power switch, the second power switch, the third power switch, the fourth power switch, the first switch unit and the second switch unit to switch between an on state and an off state.

[0027] Optionally, the voltage acquisition module includes multiple voltage acquisition units, the positive ends of the multiple voltage acquisition units are respectively connected to the power supply, the power supply bus, the first node and the second node in a one-to-one correspondence, and the output ends of the multiple voltage acquisition units are respectively connected to the receiving end of the control module to receive the output voltages of the power supply, the power supply bus, the first node and the second node.

[0028] To achieve the above-mentioned purpose, the second embodiment of the present application proposes a self-test protection device based on an H-bridge cascade topology circuit, including a power supply, a power supply bus, an H-bridge module, a voltage acquisition module and a control module; the H-bridge module includes a first power switch, a second power switch, a third power switch and a fourth power switch, the first power switch and the second power switch are connected in series through a first node to form a first bridge arm, and the third power switch and the fourth power switch are connected in series through a second node to form a second bridge arm; wherein,

[0029] The power supply is connected to the H-bridge module through the power supply bus, and is used to supply power to the H-bridge module; the voltage acquisition module is respectively connected to the power supply, the power supply bus, the first node and the second node, and is used to acquire the output voltages of the power supply, the power supply bus, the first node and the second node;

[0030] The receiving end of the control module is connected to the voltage acquisition module, and the output end of the control module is connected to the control ends of the first power switch, the second power switch, the third power switch, and the fourth power switch in a one-to-one correspondence. The control module is configured to detect the normal output states of the power supply and the power supply bus in turn based on the voltage parameters fed back and output by the voltage acquisition module, and to drive the first power switch, the second power switch, the third power switch, and the fourth power switch to switch between the on state and the off state respectively when the output states of the power supply and the power supply bus are normal, so as to detect whether the output state and the driving state of the H-bridge module are normal.

[0031] To achieve the above-mentioned purpose, the third aspect of the present application provides an electronic device, including:

[0032] processor, and

[0033] A memory, wherein computer executable instructions are stored in the memory, and when the computer executable instructions are executed by the processor, the method described in the above embodiment is executed.

[0034] The self-check protection method and device based on the H-bridge cascade topology circuit provided by the present application include at least the following beneficial effects:

[0035] The present application provides a self-checking protection method and device based on an H-bridge cascade topology circuit. The method first uses a voltage acquisition module to successively obtain the output voltage between the power supply and the power supply bus, so as to detect and confirm the voltage output state of the power supply and the power supply bus, so as to avoid the output abnormality of the power supply and the power supply bus causing the output abnormality of the H-bridge cascade topology circuit. After confirming that the output states of the power supply and the power supply bus are normal, the H-bridge module is driven to switch between different output states, and the output voltage of the first node and the second node is collected by the voltage acquisition module. According to the change of the output voltage of the first node and the second node during the switching process of the different output states of the H-bridge module, the driving state abnormality and the output state abnormality of the H-bridge module are quickly detected and judged. The present application can quickly confirm the fault location and the cause of the fault in time when the H-bridge cascade topology circuit fails, which increases the convenience of maintenance of the H-bridge cascade topology circuit, the safety and stability of use, and improves the safety of use and operation stability of the connected load equipment.

[0036] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0038] Figure 1 The present invention is a schematic diagram of the structure of an H-bridge cascade topology circuit provided according to an embodiment of the present application.

[0039] Figure 2 The present invention is a schematic diagram of the structure of another H-bridge cascade topology circuit provided according to an embodiment of the present application.

[0040] Figure 3 The present invention is a flowchart of a self-checking protection method for an H-bridge cascade topology circuit provided according to an embodiment of the present application.

[0041] Figure 4 The present invention is a flowchart of another self-checking protection method for an H-bridge cascade topology circuit provided according to an embodiment of the present application.

[0042] Figure 5 The present invention is a schematic diagram of a circuit structure of a voltage acquisition unit provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0043] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0044] In the H-bridge cascade topology circuit, MOS tube plays an important role in power conversion. Each MOS tube has strict conditions in the packaging, transportation, storage, welding and other links. If any link does not meet the requirements, it may cause internal damage to the MOS tube. Such internal damage is difficult to judge and confirm through simple instrument measurement with existing technology. Once installed on the load device, it will bring stability risks to the load device, which may cause equipment failure and shutdown at the least, or equipment damage and economic losses at the worst.

[0045] Based on the above problems, an embodiment of the present application provides a self-check protection method and device based on an H-bridge cascade topology circuit. By performing protective detection on the damage condition of each power control loop and the accuracy of the output before or when the H-bridge cascade topology circuit is turned on, the safety of use and the output stability of the H-bridge cascade topology circuit can be improved.

[0046] According to a first aspect of an embodiment of the present application, a self-checking protection method based on an H-bridge cascade topology circuit is provided. The H-bridge cascade topology circuit includes a power supply, a power supply bus, an H-bridge module, a voltage acquisition module, and a control module.

[0047] Figure 1 Schematic diagram of a H-bridge cascade topology circuit according to an embodiment of the present application. Figure 1As shown, the H-bridge module includes a first power switch Q1, a second power switch Q2, a third power switch Q3 and a fourth power switch Q4. Each power switch may include a semiconductor switch tube and a voltage divider resistor connected in parallel, and the semiconductor switch tube may include any one of a metal-oxide semiconductor field-effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), an injection enhanced gate transistor (Injection Enhanced Gate Transistor, IEGT), or an integrated gate commutated thyristor (Integrated Gate Commutated Thyristors, IGCT).

[0048] In the embodiment of the present application, each power switch is composed of a MOS and a voltage-dividing resistor connected in parallel, and the resistance values ​​of the voltage-dividing resistors in different power switches are equal. For the convenience of description, the on-off state switching of each MOS tube is directly expressed as the on-off state switching of the first power switch Q1, the second power switch Q2, the third power switch Q3 and the fourth power switch Q4. The first power switch Q1 and the second power switch Q2 are connected in series through the first node A to form a first bridge arm, and the third power switch Q3 and the fourth power switch Q4 are connected in series through the second node B to form a second bridge arm. Therefore, the first node A and the second node B are used as the output end of the H-bridge module to output voltage to the external load device, and the first power switch Q1, the second power switch Q2, the third power switch Q3 and the fourth power switch Q4 are driven to switch between the on-off and off states, so as to realize the switching of the driving H-bridge module in different states.

[0049] like Figure 2 to Figure 4 As shown, the self-check protection method based on the H-bridge cascade topology circuit provided in the embodiment of the present application includes the following steps:

[0050] S1, connecting the voltage acquisition module to the power supply, and collecting the output voltage of the power supply to detect whether the output state of the power supply is normal;

[0051] S2, when the output state of the power supply is normal, driving the power supply to supply power to the power supply bus, and connecting the voltage acquisition module to the power supply bus, and collecting the output voltage of the power supply bus when the H-bridge module is in the initial state to detect whether the output state of the power supply bus is normal;

[0052] S3, when the output state of the power supply bus is normal, the voltage acquisition module is connected to the first node and the second node respectively, and the output voltages of the first node and the second node of the H-bridge module under different driving states are collected to detect whether the output state and the driving state of the H-bridge module are normal.

[0053] Specifically, the voltage acquisition module is used to collect the output voltage U1 of the power supply in advance to determine the output state of the power supply. If the output voltage U1 of the power supply is inconsistent with the first voltage threshold range preset by the power supply, it means that there is an abnormality in the output state of the power supply, and the control module sends a power supply abnormality signal to the outside and stops the power supply from supplying power to the power supply bus.

[0054] When the output voltage U1 of the power supply is consistent with the first voltage threshold range preset by the power supply, it indicates that the output state of the power supply is normal, and the control module controls the power supply to supply power to the power supply bus, and collects the output voltage U2 of the power supply bus to determine the output state of the power supply bus. If the output voltage U2 of the power supply bus is inconsistent with the second voltage threshold range preset by the power supply bus, it indicates that there is an abnormality in the output state of the power supply bus, such as a circuit break or short circuit abnormality, and the control module sends an abnormal signal of the power supply bus to the outside, and stops the power supply from supplying power to the power supply bus.

[0055] Further, when the output voltage U2 of the power supply bus is consistent with the preset second voltage threshold range of the power supply bus, it indicates that the output state of the power supply bus is normal. At this time, by switching the H-bridge module between different driving states, the output voltage U3 of the first node A and the output voltage U4 of the second node B can be adjusted, and by collecting the output voltage U3 of the first node A and the output voltage U4 of the second node B, and comparing the collected output voltage U3 of the first node A and the output voltage U4 of the second node B with the preset voltage threshold of the corresponding driving state of the H-bridge module, it is possible to detect whether there is an abnormality in the output state and driving state of the H-bridge module, and in any driving state of the H-bridge module, when the output voltage U3 of the first node A and the output voltage U4 of the second node B are inconsistent with the corresponding preset voltage threshold, it indicates that there is an abnormality in the output state or driving state of the H-bridge module, and the control module sends an abnormal signal of the H-bridge module to the outside, and stops the power supply from supplying power to the power supply bus.

[0056] The present application first uses a voltage acquisition module to successively obtain the output voltage between the power supply and the power supply bus, so as to detect and confirm the voltage output state of the power supply and the power supply bus, so as to avoid the output abnormality of the power supply and the power supply bus causing the output abnormality of the H-bridge cascade topology circuit. After confirming that the output states of the power supply and the power supply bus are normal, the H-bridge module is driven to switch between different output states, and the output voltage of the first node and the second node is collected by the voltage acquisition module, that is, it can be based on the change of the output voltage of the first node and the second node during the switching process of the different output states of the H-bridge module, and quickly detect and judge whether the H-bridge module has abnormal driving state and abnormal output state. In other words, by performing a power-on self-test on the H-bridge cascade topology circuit before normal power-on operation, the fault location and cause of the fault can be quickly confirmed in time when the H-bridge cascade topology circuit fails, and the power is cut off at the moment when the self-test process is abnormal, which increases the convenience of maintenance of the H-bridge cascade topology circuit, the safety and stability of use, and the H-bridge cascade topology circuit is turned on and operated after the self-test is normal, which further improves the normal use safety and stable operation of the load equipment.

[0057] In some embodiments, Figure 1 and Figure 5 As shown, the voltage acquisition module may include multiple voltage acquisition units, and the circuit diagram of each voltage acquisition unit is as shown in Figure 5 As shown, the positive ends of the multiple voltage acquisition units (the in-phase end "+" of the operational amplifier) ​​are respectively connected to the positive end of the power supply, the positive end of the power supply bus, the positive end of the first node A and the positive end of the second node B in a one-to-one correspondence, and the negative ends of the multiple voltage acquisition units (the inverting ends "-" of the operational amplifier) ​​are commonly connected to the negative end of the power supply bus, so that the H-bridge cascade circuit can collect the output voltage U1 of the power supply, the output voltage U2 of the power supply bus, the output voltage U3 of the first node A and the output voltage U4 of the second node B in sequence during the power-on self-test process.

[0058] The output ends of the multiple voltage acquisition units are respectively connected to the receiving end of the control module through the output end of the voltage acquisition module, so that the output voltage U1 of the power supply, the output voltage U2 of the power supply bus, the output voltage U3 of the first node A and the output voltage U4 of the second node B can be fed back to the control module. Therefore, the control module can gradually determine whether there are abnormalities in the power supply, the power supply bus, and the H-bridge module, and send out corresponding abnormal signals when it is confirmed that there are abnormalities in the power supply, the power supply bus, and the H-bridge module.

[0059] In some embodiments, the driving state of the H-bridge module may at least include an initial state, a first state, a second state, a third state and a fourth state. The output end of the control module is respectively connected to the control ends of the first power switch Q1, the second power switch Q2, the third power switch Q3 and the fourth power switch Q4, so that the first power switch Q1, the second power switch Q2, the third power switch Q3 and the fourth power switch Q4 can be switched between the off state and the on state respectively, thereby enabling the H-bridge module to switch between the initial state, the first state, the second state, the third state and the fourth state.

[0060] When the H-bridge module is in the initial state, the first power switch Q1, the second power switch Q2, the third power switch Q3 and the fourth power switch Q4 are in the off state at the same time; when the H-bridge module is in the first state, the first power switch Q1 and the third power switch Q3 are in the on state, and the second power switch Q2 and the fourth power switch Q4 are in the off state; when the H-bridge module is in the second state, the second power switch Q2 and the fourth power switch Q4 are in the on state, and the first power switch Q1 and the third power switch Q3 are in the off state; when the H-bridge module is in the third state, the first power switch Q1 and the fourth power switch Q4 are in the on state, and the second power switch Q2 and the third power switch Q3 are in the off state; when the H-bridge module is in the fourth state, the second power switch Q2 and the third power switch Q3 are in the on state, and the first power switch Q1 and the fourth power switch Q4 are in the off state.

[0061] Therefore, in step S3, the step of collecting the output voltages of the first node A and the second node B of the H-bridge module under different driving states may specifically include:

[0062] S31, driving the H-bridge module to an initial state, and detecting whether the H-bridge module is abnormal according to the output voltage collection results of the first node A and the second node B respectively collected by the voltage collection module;

[0063] S32, driving the H-bridge module to switch between the first state, the second state, the third state and the fourth state, and detecting whether there is an abnormality in the driving state and the output state of the H-bridge module according to the collection results of the output voltages of the first node A and the second node B by the voltage collection module in the corresponding state.

[0064] When the H-bridge module is in the initial state, the first power switch Q1, the second power switch Q2, the third power switch Q3 and the fourth power switch Q4 are in the off state without a driving signal. At this time, if the output voltage U3 of the first node A and the output voltage U4 of the second node B are equal, and U3=U4=0.5U2, it can be confirmed that the first power switch Q1, the second power switch Q2, the third power switch Q3 and the fourth power switch Q4 are normal. In other words, once any switch tube on the first bridge arm and the second bridge arm has a short circuit fault abnormality, the equivalent relationship between the output voltage U3 of the first node A, the output voltage U4 of the second node B and the output voltage U2 of the power supply bus will no longer hold, thereby realizing a quick confirmation of whether the switch tube in the H-bridge module is abnormal.

[0065] In order to further detect and confirm the driving state and output state of the H-bridge module, the H-bridge module can be switched from the initial state to the first state, the second state, the third state or the fourth state in sequence under the driving signal of the control module, and the output voltage U3 of the first node A and the output voltage U4 of the second node B in the corresponding state are detected. When the driving state and output state of the H-bridge module are normal, the output voltage U3 of the first node A, the output voltage U4 of the second node B and the output voltage U2 of the power supply bus in the corresponding state should satisfy the following relationship, namely:

[0066] Status ST Q1 Q2 Q3 Q4 U3 U4 ST0 0 0 0 0 0.5U2 0.5U2 ST1 1 0 1 0 U2 U2 ST2 0 1 0 1 0 0 ST3 1 0 0 1 U2 0 ST4 0 1 1 0 0 U2

[0067] Among them, ST0 represents the initial state, ST1 represents the first state, ST2 represents the second state, ST3 represents the third state, ST4 represents the first state, 0 represents that the power switch (Q1~Q4) remains in the undriven off state; 1 represents that the power switch (Q1~Q4) remains in the on state.

[0068] In some embodiments, a first switch unit S1 and a second switch unit S2 connected in parallel are further included between the power supply and the power supply bus. The first switch unit S1 may include a bus soft start relay, and the second switch unit S2 may include a main contactor.

[0069] Therefore, when the output state of the power supply is normal, the control module controls the first switch unit S1 to be turned on, and the power supply can supply power to the power supply bus and power the power-on self-test of the H-bridge cascade topology circuit. When the driving state and output state of the H-bridge module are normal, the control module controls the second switch unit S2 to be turned on, and the power supply can continuously and stably supply power to the power supply bus.

[0070] In order to ensure the safety and stability of the voltage input and output of the H-bridge module when the power supply bus is turned on, the H-bridge cascade topology circuit can also include a bus capacitor C1, and the bus capacitor C1 is connected in parallel with the H-bridge module to the power supply bus.

[0071] According to a second aspect of the embodiment of the present application, a self-checking protection device based on an H-bridge cascade topology circuit is also provided. Figure 1 and Figure 2 As shown, it includes a power supply, a power supply bus, an H-bridge module, a voltage acquisition module and a control module.

[0072] The H-bridge module includes a first power switch Q1, a second power switch Q2, a third power switch Q3 and a fourth power switch Q4. The first power switch Q1 and the second power switch Q2 are connected in series through a first node A to form a first bridge arm, and the third power switch Q3 and the fourth power switch Q4 are connected in series through a second node B to form a second bridge arm.

[0073] The power supply is connected to the H-bridge module through the power supply bus, and is used to power the H-bridge module; the voltage acquisition module is respectively connected to the power supply, the power supply bus, the first node A and the second node B, and is used to collect the output voltages of the power supply, the power supply bus, the first node A and the second node B;

[0074] The receiving end of the control module is connected to the voltage acquisition module, and the output end of the control module is connected to the control ends of the first power switch Q1, the second power switch Q2, the third power switch Q3, and the fourth power switch Q4 in a one-to-one correspondence. The control module is configured to detect whether the output states of the power supply and the power supply bus are normal in turn based on the voltage parameters fed back by the voltage acquisition module, and when the output states of the power supply and the power supply bus are normal, drive the first power switch Q1, the second power switch Q2, the third power switch Q3, and the fourth power switch Q4 to switch between the on state and the off state, so as to detect whether the output state and the driving state of the H-bridge module are normal. The specific detection process and detection method adopt the self-test protection method described in any of the above embodiments.

[0075] According to a third aspect of the embodiments of the present application, an electronic device is also provided. The electronic device includes a processor and a memory. The memory stores computer executable instructions. When the computer executable instructions are executed by the processor, the self-check protection method described in any of the above embodiments is executed.

[0076] The processor may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0077] The memory may include one or more computer program products, and the computer program product may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory (cache), etc. Non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor may execute the program instructions to implement the steps in the above fault detection method and / or other desired functions.

[0078] An embodiment of the present invention further provides a storage medium, on which computer executable instructions are stored. When the computer executable instructions are executed by a processor, the above-mentioned fault detection method is executed.

[0079] Embodiments of the present invention may be systems, methods and / or computer program products. Computer program products may include computer-readable storage media on which are loaded computer-readable program instructions for enabling a processor to implement various aspects of embodiments of the present invention. Computer program products may be written in any combination of one or more programming languages ​​to program code for performing operations of embodiments of the present invention, and programming languages ​​include object-oriented programming languages, such as Java, C++, etc., and also include conventional procedural programming languages, such as "C" language or similar programming languages. Program code may be executed entirely on a user computing device, partially on a user device, as an independent software package, partially on a user computing device, partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computer, the remote computer may be connected to the user computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, by utilizing the state information of computer-readable program instructions to personalize an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), the electronic circuit can execute the computer-readable program instructions to implement various aspects of the embodiments of the present invention.

[0080] Computer readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. Computer readable storage medium is a tangible device that can keep and store instructions used by an instruction execution device. The readable storage medium can include, for example, but is not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage medium include: portable computer disk, hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disk read-only memory (CD ROM), digital versatile disk (DVD), memory stick, floppy disk, mechanical encoding device, such as a punch card or a convex structure in a groove on which instructions are stored, and any suitable combination of the above. The computer readable storage medium used here is not interpreted as a transient signal itself, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagated by a waveguide or other transmission medium (for example, a light pulse by an optical fiber cable), or an electrical signal transmitted by a wire.

[0081] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0082] In summary, the present application provides a self-checking protection method and device based on an H-bridge cascade topology circuit. The method first uses a voltage acquisition module to successively obtain the output voltage between the power supply and the power supply bus, so as to detect and confirm the voltage output state of the power supply and the power supply bus, so as to avoid the output abnormality of the power supply and the power supply bus causing the output abnormality of the H-bridge cascade topology circuit. After confirming that the output states of the power supply and the power supply bus are normal, the H-bridge module is driven to switch between different output states, and the output voltage of the first node and the second node is collected by the voltage acquisition module. According to the change of the output voltage of the first node and the second node during the switching process of the different output states of the H-bridge module, the driving state abnormality and the output state abnormality of the H-bridge module are quickly detected and judged. The present application can quickly confirm the fault location and the cause of the fault in time when the H-bridge cascade topology circuit fails, which increases the convenience of maintenance of the H-bridge cascade topology circuit, the safety and stability of use, and improves the safety of use and operation stability of the connected load equipment.

[0083] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0084] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

Claims

1. A self-checking protection method based on an H-bridge cascade topology circuit, characterized in that: The H-bridge cascade topology circuit includes a power supply, a power supply bus, an H-bridge module and a voltage acquisition module; the H-bridge module includes a first power switch, a second power switch, a third power switch and a fourth power switch, the first power switch and the second power switch are connected in series through a first node to form a first bridge arm, and the third power switch and the fourth power switch are connected in series through a second node to form a second bridge arm; the method includes: Connecting the voltage acquisition module to the power supply, and acquiring the output voltage of the power supply to detect whether the output state of the power supply is normal; When the output state of the power supply is normal, the power supply is driven to supply power to the power supply bus, and the voltage acquisition module is connected to the power supply bus, and the output voltage of the power supply bus when the H-bridge module is in the initial state is acquired to detect whether the output state of the power supply bus is normal; When the output state of the power supply bus is normal, the voltage acquisition module is connected to the first node and the second node respectively, and the output voltages of the first node and the second node of the H-bridge module in different driving states are collected to detect whether the output state and the driving state of the H-bridge module are normal.

2. The method according to claim 1, characterized in that The driving state of the H-bridge module at least includes an initial state, a first state, a second state, a third state and a fourth state; wherein, When the H-bridge module is in an initial state, the first power switch, the second power switch, the third power switch and the fourth power switch are simultaneously in an off state; When the H-bridge module is in the first state, the first power switch and the third power switch are in the on state, and the second power switch and the fourth power switch are in the off state; When the H-bridge module is in the second state, the second power switch and the fourth power switch are in the on state, and the first power switch and the third power switch are in the off state; When the H-bridge module is in the third state, the first power switch and the fourth power switch are in the on state, and the second power switch and the third power switch are in the off state; When the H-bridge module is in the fourth state, the second power switch and the third power switch are in the on state, and the first power switch and the fourth power switch are in the off state.

3. The method according to claim 2, characterized in that The step of collecting the output voltages of the first node and the second node of the H-bridge module in different driving states comprises: Driving the H-bridge module to be in the initial state, and detecting the output state of the H-bridge module according to the acquisition results of the output voltages of the first node and the second node respectively by the voltage acquisition module; The H-bridge module is driven to switch between the first state, the second state, the third state and the fourth state, and the driving state of the H-bridge module is detected according to the acquisition results of the output voltages of the first node and the second node respectively by the voltage acquisition module in the corresponding state.

4. The method according to claim 3, characterized in that When the H-bridge module is in the initial state, and the output voltage of the first node is equal to the output voltage of the second node and is consistent with half of the output voltage of the power supply bus, the output state of the H-bridge module is normal.

5. The method according to claim 3, characterized in that: When the H-bridge module is in the first state, and the output voltage of the first node is equal to the output voltage of the second node and is consistent with the output voltage of the power supply bus, or, When the H-bridge module is in the second state, and the output voltage of the first node and the output voltage of the second node both tend to zero, or, When the H-bridge module is in the third state, the output voltage of the first node is consistent with the output voltage of the power supply bus, and the output voltage of the second node tends to zero, or, When the H-bridge module is in the fourth state, the output voltage of the second node is consistent with the output voltage of the power supply bus, and the output voltage of the first node tends to zero, the driving state and output state of the H-bridge module are normal.

6. The method according to claim 1, characterized in that The power supply and the power supply bus also include a first switch unit and a second switch unit connected in parallel with each other. The first switch unit is turned on when the output state of the power supply is normal, and the second switch unit is turned on when the output state and driving state of the H-bridge module are normal.

7. The method according to claim 6, characterized in that The H-bridge cascade topology circuit also includes a control module, and multiple output ends of the control module are respectively connected to the first power switch, the second power switch, the third power switch, the fourth power switch, the first switch unit and the second switch unit in a one-to-one correspondence to respectively drive the first power switch, the second power switch, the third power switch, the fourth power switch, the first switch unit and the second switch unit to switch between an on state and an off state.

8. The method according to claim 7, characterized in that The voltage acquisition module includes multiple voltage acquisition units, the positive ends of the multiple voltage acquisition units are respectively connected to the power supply, the power supply bus, the first node and the second node in a one-to-one correspondence, and the output ends of the multiple voltage acquisition units are respectively connected to the receiving end of the control module to receive the output voltages of the power supply, the power supply bus, the first node and the second node.

9. A self-checking protection device based on an H-bridge cascade topology circuit, characterized in that: It includes a power supply, a power supply bus, an H-bridge module, a voltage acquisition module and a control module; the H-bridge module includes a first power switch, a second power switch, a third power switch and a fourth power switch, the first power switch and the second power switch are connected in series through a first node to form a first bridge arm, and the third power switch and the fourth power switch are connected in series through a second node to form a second bridge arm; wherein, The power supply is connected to the H-bridge module through the power supply bus, and is used to supply power to the H-bridge module; the voltage acquisition module is respectively connected to the power supply, the power supply bus, the first node and the second node, and is used to acquire the output voltages of the power supply, the power supply bus, the first node and the second node; The receiving end of the control module is connected to the voltage acquisition module, and the output end of the control module is connected to the control ends of the first power switch, the second power switch, the third power switch, and the fourth power switch in a one-to-one correspondence. The control module is configured to detect whether the output states of the power supply and the power supply bus are normal in turn based on the voltage parameters fed back and output by the voltage acquisition module, and when the output states of the power supply and the power supply bus are normal, respectively drive the first power switch, the second power switch, the third power switch, and the fourth power switch to switch between the on state and the off state, so as to detect whether the output state and the driving state of the H-bridge module are normal.

10. An electronic device, characterized in that: include: processor, and A memory, wherein computer executable instructions are stored in the memory, and when the computer executable instructions are executed by the processor, the method according to any one of claims 1 to 8 is executed.

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