System protection method based on h-bridge cascaded topology circuit

Abstract

The application discloses a system protection method based on an H-bridge cascaded topology circuit, which comprises the following steps: a voltage detection module acquires an initial voltage value of a voltage collection point in an initial state; when the initial voltage value is equal to a preset initial voltage, a controller sends a driving signal to a driving module, so that a power tube corresponding to the driving signal performs a matching action; the voltage detection module acquires a detection voltage value of the voltage collection point and sends the detection voltage value to the controller; and when the detection voltage value is equal to a preset detection voltage, the controller determines that the state of the power tube corresponding to the driving signal and the part of the driving module matched with the power tube is normal. The application performs self-checking on the power tube and the driving part before the H-bridge cascaded topology circuit is used, and the system is started after the self-checking is normal, so that the normal use of the system is ensured; when a fault occurs in the system, the damage of each power control loop is detected, the damaged module is found in time, and the maintainability and convenience of the system are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power electronics, and particularly relates to a system protection method based on an H-bridge cascaded topology circuit. BACKGROUND

[0002] An H-bridge circuit is a typical motor control circuit, and is named as an H-bridge because its circuit shape is similar to the letter H. Four power tubes form four vertical legs of the H, and a load is a horizontal bar in the H.

[0003] With the development of power electronics technology, the H-bridge circuit has been widely applied, for example, an energy storage circuit based on H-bridge cascading, a multi-level inverter based on H-bridge cascading, etc., collectively referred to as a multi-level topology circuit based on H-bridge cascading.

[0004] Many groups of power switching devices are used in the multi-level topology circuit based on H-bridge cascading, and the turn-on and turn-off control of the power switching devices needs to be controlled by a core controller sending signals uniformly. Sometimes, one topology circuit needs many H-bridges in cascade, so that the entire circuit system is relatively large, the number of control loops of the entire circuit system is relatively large, and the number of power tubes of the entire circuit system is relatively large. Some power tubes are damaged in transportation or welding, and the abnormality is not found before use, which causes the entire circuit system to be abnormal when used. Some power tubes are abnormal after being used for a period of time, which causes the entire circuit system to be abnormal.

[0005] Therefore, a method for detecting the damage of each power control loop before or during use of the topology circuit based on H-bridge cascading is urgently needed. SUMMARY

[0006] In view of this, the application provides a system protection method based on an H-bridge cascaded topology circuit, and the main purpose is to solve the problem that the damage of each power control loop cannot be detected before or during use of the topology circuit based on H-bridge cascading.

[0007] To solve the above problems, the application provides a system protection method based on an H-bridge cascaded topology circuit, which comprises a controller, a driving module, a plurality of groups of H-bridge power modules and a voltage detection module. The input end of the driving module is electrically connected with the data output pin of the controller, and the output end is electrically connected with the input end of each group of H-bridge power modules. Each group of H-bridge power modules comprises two groups of power tube units, each power tube unit is provided with a voltage collection point, and each power tube unit comprises a first power tube and a second power tube. The plurality of groups of H-bridge power modules are connected in cascade, the input end of the voltage detection module is electrically connected with each voltage collection point of each group of H-bridge power modules, and the output end is electrically connected with the data input pin of the controller.

[0008] The system protection method based on the H-bridge cascaded topology circuit comprises:

[0009] The voltage detection module obtains initial voltage values of voltage collection points on each group of power tube units in an initial state and sends the initial voltage values to the controller.

[0010] For each group of power tube units, when the initial voltage value is equal to a preset initial voltage, the controller sends a first driving signal to the driving module to drive a first power tube to be turned on.

[0011] The voltage detection module obtains first detection voltage values of the voltage collection points after the first power tube is turned on and sends the first detection voltage values to the controller.

[0012] When the first detection voltage value is equal to a first preset detection voltage, the controller determines that the state of the first power tube and the part of the driving module matched with the first power tube is normal, and sends a second driving signal to the driving module to drive a second power tube to be turned on.

[0013] The voltage detection module obtains second detection voltage values of the voltage collection points after the second power tube is turned on and sends the second detection voltage values to the controller.

[0014] When the second detection voltage value is equal to a second preset detection voltage, the controller determines that the state of the second power tube and the part of the driving module matched with the second power tube is normal.

[0015] In an embodiment of the present application, optionally, when the initial voltage value in a group of power tube units is not equal to the preset initial voltage, the controller determines that the state of the first power tube, the second power tube and the part of the driving module matched with the first power tube and the second power tube in the group of power tube units is abnormal.

[0016] In an embodiment of the present application, optionally, when the first detection voltage value in a group of power tube units is not equal to the first preset detection voltage, the controller determines that the state of the first power tube and the part of the driving module matched with the first power tube is abnormal.

[0017] When the second detection voltage value in a group of power tube units is not equal to the second preset detection voltage, the controller determines that the state of the second power tube and the part of the driving module matched with the second power tube is abnormal.

[0018] In an embodiment of the present application, optionally, the driving module comprises a signal generation unit and a plurality of groups of driving circuits, an input end of the signal generation unit is electrically connected with a data output pin of the controller, an output end of the signal generation unit is electrically connected with an input end of each group of driving circuits, and an output end of each group of driving circuits is electrically connected with an input end of a group of H-bridge power modules.

[0019] In one embodiment of the present application, optionally, the voltage detection module comprises a signal detection unit and a plurality of voltage detection circuits, the input end of each voltage detection circuit is electrically connected with each voltage collection point of a group of H-bridge power modules, the output end of each voltage detection circuit is electrically connected with the input end of the signal detection unit, and the output end of the signal detection unit is electrically connected with the data input pin of the controller.

[0020] In one embodiment of the present application, optionally, the two groups of power tube units of the H-bridge power module are connected in an H shape, one group of power tube units as the left side wall of the H shape, and the other group of power tube units as the right side wall of the H shape.

[0021] In one embodiment of the present application, optionally, the drain of each first power tube is electrically connected with the positive terminal of the power supply voltage, the gate and the source of each first power tube are electrically connected with the output end of the driving circuit, and the source of each first power tube is electrically connected with the drain of the second power tube, the gate and the source of the second power tube are electrically connected with the output end of the driving circuit, and the source of each second power tube is electrically connected with the negative terminal of the power supply voltage.

[0022] In one embodiment of the present application, optionally, each voltage detection module further comprises two groups of resistors, each group of resistors comprising a first resistor and a second resistor, the first end of the first resistor being electrically connected with the positive terminal of the power supply voltage, the second end of the first resistor being electrically connected with the first end of the second resistor, the source of the first power tube and the drain of the second power tube respectively, and the second end of the second resistor being electrically connected with the negative terminal of the power supply voltage, the connection of the second end of the first resistor, the first end of the second resistor, the source of the first power tube and the drain of the second power tube being taken as a voltage collection point.

[0023] In one embodiment of the present application, optionally, the controller sends the first driving signal of the first power tube to the signal generation unit, the signal generation unit generates the conduction signal of the first power tube according to the first driving signal of the first power tube, sends the conduction signal of the first power tube to the driving circuit, so that the driving circuit drives the first power tube to be turned on.

[0024] In one embodiment of the present application, optionally, the controller sends the second driving signal of the second power tube to the signal generation unit, the signal generation unit generates the conduction signal of the second power tube according to the second driving signal of the second power tube, and sends the conduction signal of the second power tube to the driving circuit, so that the driving circuit drives the second power tube to be turned on.

[0025] The beneficial effects in the application: the system protection method based on the H-bridge cascaded topology circuit provided by the application, a drive signal is sent to the drive module by the controller, the drive module drives the power tube of the H-bridge power module to be turned on, the voltage detection module collects the detection voltage value on the voltage collection point, when the detection voltage value is equal to the preset detection voltage, it indicates that the power tube and the driving part corresponding to the power tube are normal, the power tube and the driving part are self-checked before the H-bridge cascaded topology circuit is used, and the system is started after the self-checking is normal, so that the normal use of the system is ensured, the damage of each power control loop is detected when the system fails, the damaged module is found in time, the maintainability and convenience of the system are increased, and the system protection of the whole topology circuit is realized.

[0026] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, the content of the specification can be implemented, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the specific embodiments of the application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0027] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered as limiting the application. Moreover, the same reference symbols are used throughout the drawings to represent the same parts. In the drawings:

[0028] Figure 1 A structure block diagram of the H-bridge cascaded topology circuit of the system protection method based on the H-bridge cascaded topology circuit for the exemplary embodiment of the application;

[0029] Figure 2 A flow chart of the system protection method based on the H-bridge cascaded topology circuit for the exemplary embodiment of the application;

[0030] Figure 3 Another structure block diagram of the H-bridge cascaded topology circuit of the system protection method based on the H-bridge cascaded topology circuit for the exemplary embodiment of the application;

[0031] Figure 4 Another flow chart of the system protection method based on the H-bridge cascaded topology circuit for the exemplary embodiment of the application.

[0032] Among them,

[0033] Figures 1-4The reference signs are as follows: 11-controller; 12-driving module; 121-signal generating unit; 122-driving circuit; 14-H bridge power module; 141-first power tube; 142-second power tube; 15-voltage detection module; 151-signal detection unit; 152-voltage detection circuit; R1-first resistor; R2-second resistor. DETAILED DESCRIPTION

[0034] Hereinafter, the present application will be described in detail with reference to the accompanying drawings and embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0035] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined object, the specific embodiments, structures, features and effects according to the present application will be described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "embodiments" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0036] The following will be described in conjunction with Figures 1 to 4 The system protection method based on H bridge cascaded topology circuit according to some embodiments of the present application is described.

[0037] In one embodiment, a system protection method based on H bridge cascaded topology circuit, the H bridge cascaded topology circuit, as shown in Figure 1 includes a controller 11, a driving module 12, a plurality of H bridge power modules 14 and a voltage detection module 15,

[0038] The input end of the driving module 12 is electrically connected with the data output pin of the controller 11, and the output end is electrically connected with the input end of each H bridge power module 14. Each H bridge power module 14 includes two power tube units, each of which is provided with a voltage acquisition point, and each power tube unit includes a first power tube 141 and a second power tube 142. The plurality of H bridge power modules 14 are connected in cascade, the input end of the voltage detection module 15 is electrically connected with each voltage acquisition point of a group of H bridge power modules 14, and the output end is electrically connected with the data input pin of the controller 11.

[0039] The system protection method based on H bridge cascaded topology circuit, as shown in Figure 2 includes:

[0040] 102: The voltage detection module 15 acquires the initial voltage value of the voltage acquisition point on each power tube unit in the initial state, and sends it to the controller 11;

[0041] 104: For each group of power tube units, when the initial voltage value is equal to the preset initial voltage, the controller 11 sends a first driving signal to the driving module 12 to drive the first power tube to conduct;

[0042] 106: The voltage detection module 15 acquires the first detection voltage value of the voltage collection point after the first power tube conducts and sends it to the controller 11;

[0043] 108: When the first detection voltage value is equal to the first preset detection voltage, the controller 11 determines that the state of the first power tube and the part of the driving module 12 matched with the first power tube is normal, and sends a second driving signal to the driving module 12 to drive the second power tube to conduct;

[0044] 110: The voltage detection module 15 acquires the second detection voltage value of the voltage collection point after the second power tube conducts and sends it to the controller 11;

[0045] 112: When the second detection voltage value is equal to the second preset detection voltage, the controller 11 determines that the state of the second power tube and the part of the driving module 12 matched with the second power tube is normal.

[0046] Specifically, the H-bridge cascaded topology circuit includes a controller, a driving module, a cascaded H-bridge power module, and a voltage detection module. The controller sends a driving signal to the driving module. The driving module outputs a power tube conduction signal to the H-bridge power module according to the driving signal. The H-bridge power module corresponds to the power tube that conducts.

[0047] For a group of power tube units, when the controller does not send any driving signal, that is, the power tubes of the H-bridge power module are not turned on, the voltage detection module collects the initial voltage value of the voltage collection point and sends it to the controller. When the initial voltage value is equal to the preset initial voltage, the controller determines that the first power tube and the second power tube of the group of power tube units have no short circuit phenomenon. The controller sends the first driving signal of the first power tube to the driving module. The driving module sends the conduction signal of the first power tube to the H-bridge power module. The first power tube is turned on, and the second power tube in the power tube unit is turned off. At this time, the voltage detection module collects the first detection voltage value of the voltage collection point. If the first detection voltage value of the voltage collection point at this time is equal to the first preset detection voltage value, it means that the first power tube and the corresponding driving part of the first power tube are normal. The controller stops sending the first driving signal of the first power tube in the power tube unit and sends the second driving signal of the second power tube in the power tube unit to the driving module. The driving module sends the conduction signal of the second power tube to the H-bridge power module. The second power tube is turned on, and the first power tube in the power tube unit is turned off. At this time, the voltage detection module collects the second detection voltage value of the voltage collection point. If the second detection voltage value of the voltage collection point at this time is equal to the second preset detection voltage value, it means that the second power tube and the corresponding driving part of the second power tube are normal.

[0048] For each group of power tube units, repeat the above driving, voltage collection and other processes until each group of power tubes of each H-bridge power module is detected.

[0049] Compared with the prior art, the system protection method based on the H-bridge cascaded topology circuit provided by the application sends the driving signal to the driving module through the controller. The driving module makes the power tube of the H-bridge power module conduct. The voltage detection module collects the detection voltage value on the voltage collection point. When the detection voltage value is equal to the preset detection voltage, it means that the power tube and the corresponding driving part of the power tube are normal. The self-checking of the power tube and the driving part is performed before the use of the H-bridge cascaded topology circuit. After the self-checking is normal, the system is started to run, which ensures the normal use of the system. When the system fails, the damage of each power control loop is detected, the damaged module is found in time, the maintainability and convenience of the system are increased, and the system protection of the entire topology circuit is realized.

[0050] In one embodiment, when the initial voltage value of a group of power tube units is not equal to the preset initial voltage, the controller determines that the state of the first power tube, the second power tube in the group of power tubes and the part in the driving module matched with the first power tube and the second power tube is abnormal. For example, the first power tube and the second power tube have a short circuit phenomenon. When the initial voltage value is equal to the amplitude of the power supply voltage, it means that the first power tube is short-circuited. When the initial voltage value is equal to zero, it means that the second power tube is short-circuited.

[0051] In one embodiment, when the first detection voltage value in a group of power tube units is not equal to the first preset detection voltage, the controller 11 determines that the state of the first power tube and the part of the driving module matched with the first power tube is abnormal;

[0052] When the second detection voltage value in a group of power tube units is not equal to the second preset detection voltage, the controller 11 determines that the state of the second power tube and the part of the driving module matched with the second power tube is abnormal.

[0053] Specifically, for a group of power tube units, after the controller sends the first driving signal of the first power tube to the driving module, the driving module generates the first power tube conduction signal and sends it to the H-bridge power module, so that the corresponding first power tube of the H-bridge power module is turned on, and the second power tube in the same power tube unit is turned off. When the first detection voltage value of the voltage acquisition point acquired by the controller from the voltage detection module is not equal to the first preset detection voltage, the controller determines that the first power tube and the driving part matched with the first power tube are abnormal.

[0054] For a group of power tube units, after the controller determines the working state of the first power tube and the driving part matched with the first power tube, the controller sends the second driving signal of the second power tube to the driving module. After that, the driving module generates the second power tube conduction signal and sends it to the H-bridge power module, so that the corresponding second power tube of the H-bridge power module is turned on, and the first power tube in the same power tube unit is turned off. When the second detection voltage value of the voltage acquisition point acquired by the controller from the voltage detection module is not equal to the second preset detection voltage, the controller determines that the second power tube and the driving part matched with the second power tube are abnormal.

[0055] In one embodiment, as shown in Figure 3 The driving module 12 includes a signal generating unit 121 and a plurality of driving circuits 122. The input end of the signal generating unit 121 is electrically connected with the data output pin of the controller 11, the output end of the signal generating unit 121 is electrically connected with the input end of each driving circuit 122, and the output end of each driving circuit 122 is electrically connected with the input end of a group of H-bridge power modules 14.

[0056] Specifically, the signal generating circuit is connected with the controller. After receiving the driving signal of the controller, the signal generating circuit generates the conduction or off signal of the power tube according to the driving signal, and sends the generated conduction or off signal of the power tube to the driving circuit matched with the power tube. The driving circuit sends a certain current to the power tube according to the conduction signal of the power tube, so that the power tube is turned on, and the sending of the current is stopped, so that the power tube is turned off.

[0057] As a preferred embodiment of the present embodiment, the signal generating unit is only one, the driving circuit has multiple, one group of H-bridge power modules is connected to one driving circuit, and all the driving circuits are connected to the signal generating unit.

[0058] In one embodiment, as shown in Figure 3 the voltage detection module 15 includes a signal detection unit 151 and multiple groups of voltage detection circuits 152. The input end of each group of voltage detection circuits 152 is electrically connected to each voltage sampling point of one group of H-bridge power modules 14. The output end of each group of voltage detection circuits 152 is electrically connected to the input end of the signal detection unit 151. The output end of the signal detection unit 151 is electrically connected to the data input pin of the controller 11.

[0059] Specifically, there is only one signal detection unit, and each voltage detection circuit is connected to the signal detection unit. One voltage detection circuit is connected to one group of H-bridge power modules. The voltage detection circuit collects the voltage values of each voltage sampling point on the H-bridge power module and sends them to the signal detection unit. The signal detection unit sends the voltage values of the voltage sampling points on the H-bridge power module collected by the voltage detection circuit to the controller.

[0060] In one embodiment, as shown in Figure 3 the two groups of power tube units of the H-bridge power module 14 are connected in an H shape. One group of power tube units serves as the left side wall of the H shape, and the other group of power tube units serves as the right side wall of the H shape.

[0061] Specifically, each group of power tube units includes a first power tube and a second power tube. The two groups of power tube units are in an H shape, i.e., four power tubes serve as four legs of the H shape. The power tubes of the left two legs form one group of power tubes, and the power tubes of the right two legs form one group of power tubes.

[0062] In one embodiment, as shown in Figure 3 the drain of each first power tube 141 is electrically connected to the positive terminal of the power supply voltage. The gate and source of each first power tube 141 are electrically connected to the output end of the driving circuit. The source of each first power tube 141 is electrically connected to the drain of the second power tube 142. The gate and source of the second power tube 142 are electrically connected to the output end of the driving circuit 122. The source of each second power tube 142 is electrically connected to the negative terminal of the power supply voltage.

[0063] Specifically, for a set of power transistors in an H-bridge power module, the drain of the first power transistor is connected to the positive terminal of the power supply voltage, the source of the second power transistor is connected to the negative terminal of the power supply voltage, and the source of the first power transistor is connected to the drain of the second power transistor. The gate and source of the first power transistor, and the gate and source of the second power transistor, are both connected to the output terminal of the driver circuit. The source of the first power transistor and the drain of the second power transistor are also connected to the source and drain of the first power transistor and the second power transistor of a set of power transistors in an adjacent H-bridge power module. The source and drain of the first power transistor and the second power transistor of another set of power transistors in the same H-bridge power module are connected to the source and drain of the first power transistor and the second power transistor of a set of power transistors in another adjacent H-bridge power module.

[0064] In one embodiment, if an H-bridge power module has only one adjacent H-bridge power module, the source of the first power transistor and the drain of the second power transistor in one set of power transistors in the H-bridge power module are connected to the source of the first power transistor and the drain of the second power transistor in one set of power transistors in the adjacent H-bridge power module, and the source of the first power transistor and the drain of the second power transistor in the other set of power transistors in the H-bridge power module are connected to the load, forming a loop.

[0065] In one embodiment, such as Figure 3 As shown, each voltage detection module 152 also includes two sets of resistors. Each set of resistors includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is electrically connected to the positive terminal of the power supply voltage. The second end of the first resistor R1 is electrically connected to the first end of the second resistor R2, the source of the first power transistor 141, and the drain of the second power transistor 142, respectively. The second end of the second resistor R2 is electrically connected to the negative terminal of the power supply voltage. The connection point of the second end of the first resistor R1, the first end of the second resistor R2, the source of the first power transistor 141, and the drain of the second power transistor 142 is used as the voltage acquisition point.

[0066] Specifically, the voltage detection module also includes two sets of resistors. Each set of resistors includes a first resistor and a second resistor. The first resistor and the second resistor are connected in series and then connected in parallel with a set of power transistor units. The connection point of the first resistor and the second resistor is connected to the connection point of the source and the drain of the first power transistor, serving as a voltage acquisition point.

[0067] In one embodiment, the controller 11 sends a first drive signal of the first power transistor 141 to the signal generation unit 121. The signal generation unit 121 generates a conduction signal of the first power transistor 141 according to the first drive signal of the first power transistor 141 and sends the conduction signal of the first power transistor 141 to the drive circuit 122 so that the drive circuit 122 drives the first power transistor 141 to conduct.

[0068] Specifically, the signal generation circuit is connected to the controller. After receiving the first drive signal from the controller, it generates a turn-on signal for the first power transistor based on the first drive signal. This turn-on signal is then sent to the drive circuit that matches the first power transistor. The drive circuit sends a certain current to the first power transistor based on the turn-on signal, causing the first power transistor to turn on. Conversely, it does not send a certain current to the first power transistor, causing it to turn off.

[0069] In one embodiment, the controller 11 sends a second drive signal of the second power transistor 142 to the signal generation unit 121. The signal generation unit 121 generates a conduction signal of the second power transistor 142 according to the second drive signal of the second power transistor 142 and sends the conduction signal of the second power transistor 142 to the drive circuit 122 so that the drive circuit 122 drives the second power transistor 142 to conduct.

[0070] Specifically, the signal generation circuit is connected to the controller. After receiving the second drive signal from the controller, it generates a turn-on signal for the second power transistor based on the second drive signal. This turn-on signal is then sent to the drive circuit that matches the second power transistor. The drive circuit sends a certain current to the second power transistor based on the turn-on signal, causing the second power transistor to turn on. Conversely, it stops sending a certain current to the second power transistor, causing it to turn off.

[0071] In a preferred embodiment of this example, the first resistor and the second resistor have the same resistance value.

[0072] Taking the case where the first and second resistors have the same resistance value as an example, such as Figure 4 As shown, V2 represents the amplitude of the power supply voltage. The first item begins by detecting the voltage value V1 at the initial voltage acquisition point. If V1 = 0.5 × V2, it indicates that there is no short circuit between the first power transistor Q1 and the second power transistor Q2. Conversely, if V1 = V2, it indicates that the first power transistor Q1 is short-circuited; if V1 = 0, it indicates that the second power transistor Q2 is short-circuited. In this case, the system detection result indicates a circuit or module malfunction, and the detection ends.

[0073] After completing step 1, the controller sends the first drive signal of the first power transistor Q1 to the signal generation module. The signal generation module generates a transmittable signal to the drive circuit, which then drives the first power transistor Q1 to conduct, short-circuiting the first resistor. The system then begins detecting the voltage V1 at the voltage acquisition point. If V1 = V2, the first power transistor Q1 and the corresponding drive section are functioning normally. Otherwise, the system detects an abnormality in the circuit or module, and the detection ends.

[0074] After the second item is executed, the controller sends the second driving signal of the second power tube Q2 to the signal generating module, the signal generating module generates the transmissible signal to the driving circuit, the driving circuit drives the second power tube Q2 to be turned on, and the second resistance is short-circuited. The system starts to detect the voltage V1 of the voltage sampling point, and if V1=0, the second power tube Q2 and the corresponding driving part are normal. Otherwise, the system detects that the circuit or the module is abnormal, and the detection is ended.

[0075] If the above detection is normal, it is indicated that the driving circuit and the power device of the first power tube Q1 and the second power tube Q2 of the group of power tubes can work normally. The first power tube Q1 and the second power tube Q2 of another group of power tubes and the power tubes of other H-bridge power modules are detected by the same method.

[0076] It should be understood that various modifications can be made to the embodiments disclosed herein. Therefore, the foregoing description should not be taken as limiting, but merely as exemplification of preferred embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the application.

[0077] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and, together with the general description of the application given above, and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0078] These and other characteristics of the present application will become apparent from the following description of the preferred forms thereof given, by way of non-limiting example only, with reference to the accompanying drawings.

[0079] It should also be understood that, although the present application has been described above with reference to particular means, materials and embodiments, the present application is by no means limited to the particulars described and as such extends to all alternative constructions falling within the scope of the application.

[0080] The above and other aspects, features, and advantages of the present application will become more apparent from the following detailed description, taken in conjunction with the accompanying drawings, when properly considered together.

[0081] Hereinafter, specific embodiments of the present application are described with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the present application, which can be implemented in various ways. Well-known and / or repetitive functions and structures are not described in detail to avoid unnecessary or redundant details that would obscure the present application. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but are merely representative of the present application as a basis and representative for the claims and for teaching one of ordinary skill in the art to variously employ the present application in virtually any appropriate detailed structure.

[0082] The specification can use phrases such as "in one embodiment", "in another embodiment", "in yet another embodiment", or "in other embodiments", which can refer to one or more embodiments under the application.

[0083] The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application. The scope of protection of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements should also be considered to fall within the protection scope of the present application.

Claims

1. A system protection method based on H-bridge cascaded topology circuit, characterized in that, The application relates to an H-bridge cascaded topology circuit and a system protection method thereof. The H-bridge cascaded topology circuit comprises a controller, a driving module, a plurality of groups of H-bridge power modules and a voltage detection module. The voltage detection module obtains initial voltage values of the voltage collection points on each group of power tube units in an initial state and sends the initial voltage values to the controller. For each group of power tube units, when the initial voltage value is equal to a preset initial voltage, the controller sends a first driving signal to the driving module to drive the first power tube to be turned on. The voltage detection module obtains first detection voltage values of the voltage collection points after the first power tube is turned on and sends the first detection voltage values to the controller. When the first detection voltage value is equal to a first preset detection voltage, the controller determines that the states of the first power tube and the part of the driving module matched with the first power tube are normal, and sends a second driving signal to the driving module to drive the second power tube to be turned on. The voltage detection module obtains second detection voltage values of the voltage collection points after the second power tube is turned on and sends the second detection voltage values to the controller. When the second detection voltage value is equal to a second preset detection voltage, the controller determines that the states of the second power tube and the part of the driving module matched with the second power tube are normal. When the initial voltage value in a group of power tube units is not equal to the preset initial voltage, the controller determines that the states of the first power tube, the second power tube and the part of the driving module matched with the first power tube and the second power tube in the group of power tube units are abnormal.

2. The system protection method based on H-bridge cascaded topology circuit according to claim 1, characterized in that, When the first detection voltage value in a group of power tube units is not equal to the first preset detection voltage, the controller determines that the state of the first power tube and the part of the driving module matched with the first power tube is abnormal.

3. The method of claim 1, wherein the H-bridge cascaded topology based system protection method is characterized by, When the second detection voltage value in a group of power tube units is not equal to the second preset detection voltage, the controller determines that the state of the second power tube and the part of the driving module matched with the second power tube is abnormal. The driving module comprises a signal generation unit and a plurality of groups of driving circuits.

4. The method of claim 1, wherein the H-bridge cascaded topology based system protection method is characterized by, The input end of the signal generation unit is electrically connected with the data output pin of the controller. The output end of the signal generation unit is electrically connected with the input end of each group of driving circuits. The output end of each group of driving circuits is electrically connected with the input end of a group of H-bridge power modules.

5. The method of claim 1, wherein the H-bridge cascaded topology based system protection method further comprises: The voltage detection module includes a signal detection unit and multiple voltage detection circuits. The input terminal of each voltage detection circuit is electrically connected to each voltage acquisition point of a set of H-bridge power modules. The output terminal of each voltage detection circuit is electrically connected to the input terminal of the signal detection unit. The output terminal of the signal detection unit is electrically connected to the data input pin of the controller.

6. The method of claim 1, wherein the H-bridge cascaded topology based system protection method further comprises: The two sets of power transistor units of the H-bridge power module are connected in an H-shape, with one set of power transistor units serving as the left side wall of the H-shape and the other set of power transistor units serving as the right side wall of the H-shape.

7. The method of claim 4, wherein the H-bridge cascaded topology based system protection method further comprises: The drain of each first power transistor is electrically connected to the positive terminal of the power supply voltage, the gate and source of each first power transistor are electrically connected to the output terminal of the drive circuit, the source of each first power transistor is electrically connected to the drain of the second power transistor, the gate and source of the second power transistor are electrically connected to the output terminal of the drive circuit, and the source of each second power transistor is electrically connected to the negative terminal of the power supply voltage.

8. The system protection method based on H-bridge cascaded topology circuit according to claim 7, characterized in that, Each voltage detection module further includes two sets of resistors, each set including a first resistor and a second resistor. The first end of the first resistor is electrically connected to the positive terminal of the power supply voltage. The second end of the first resistor is electrically connected to the first end of the second resistor, the source of the first power transistor, and the drain of the second power transistor. The second end of the second resistor is electrically connected to the negative terminal of the power supply voltage. The connection point of the second end of the first resistor, the first end of the second resistor, the source of the first power transistor, and the drain of the second power transistor is used as the voltage acquisition point.

9. The system protection method based on H-bridge cascaded topology circuit according to claim 8, characterized in that, The controller sends a first drive signal of the first power transistor to the signal generation unit. The signal generation unit generates a turn-on signal of the first power transistor based on the first drive signal of the first power transistor, and sends the turn-on signal of the first power transistor to the drive circuit so that the drive circuit drives the first power transistor to turn on.

10. The system protection method based on H-bridge cascaded topology circuit according to claim 8, characterized in that, The controller sends a second drive signal for the second power transistor to the signal generation unit. The signal generation unit generates a turn-on signal for the second power transistor based on the second drive signal and sends the turn-on signal to the drive circuit so that the drive circuit drives the second power transistor to turn on.

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