Output series-parallel switching circuit and control method thereof, electronic device, and storage medium

Abstract

The present invention discloses an output series-parallel switching circuit and a control method thereof, an electronic device, and a storage medium. Compared with the related prior art, not only a first anti-blocking element and a second anti-blocking element are provided to prevent high voltage reverse injection from damaging a corresponding DC / DC conversion unit, but also a first switch circuit and a second switch circuit are provided to cooperate in protecting the second DC / DC conversion unit to prevent the second DC / DC conversion unit from being damaged by reverse injection due to output of high voltage due to failure of the second anti-blocking element, thereby improving the safety and reliability of a charging module during operation, especially controlling the working state of the output series-parallel switching circuit according to the real-time output voltage of the output series-parallel switching circuit and the series-parallel state of the corresponding DC / DC conversion unit, thereby ensuring that the charging module can maintain a good working state during real-time operation, further improving the safety and reliability of the charging module during operation.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronic circuits, and in particular to an output series-parallel switching circuit and a control method thereof, an electronic device, and a computer-readable storage medium. Background Art

[0002] With the rapid development of the new energy electric vehicle industry, the requirements for the DC output power of the charging module are also increasing, and the output voltage range is gradually being required to be wider and wider, which can be met by the series-parallel switching circuit. At present, although the series-parallel switching circuit in the relevant technology can generally realize the series-parallel switching of the output state, it cannot effectively prevent the voltage backflow that may occur in the actual situation where the switching element in the circuit is damaged, which can easily cause the core components in the switching circuit to fail or even be damaged, and the safety and reliability are not high. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the present invention proposes an output series-parallel switching circuit and a control method thereof, an electronic device, and a computer-readable storage medium, which can improve the safety and reliability of a charging module during operation.

[0004] In a first aspect, an embodiment of the present invention provides an output series-parallel switching circuit, comprising a first DC / DC conversion unit for outputting a converted first DC voltage, a second DC / DC conversion unit for outputting a converted second DC voltage, a first switching circuit, a second switching circuit, a first anti-blocking element, and a second anti-blocking element, wherein one end of the first anti-blocking element is connected to the positive output end of the first DC / DC conversion unit, and the other end is connected to the output positive electrode of the output series-parallel switching circuit; one end of the second anti-blocking element is connected to the output positive electrode of the output series-parallel switching circuit, and the other end is connected to the positive output end of the second DC / DC conversion unit through the first switching circuit; the first switching circuit is connected to the negative output end of the first DC / DC conversion unit and the positive output end of the second DC / DC conversion unit. The negative output end of the second DC / DC conversion unit is connected to the output negative electrode of the output series-parallel switching circuit; wherein the first anti-blocking element is used to prevent high-voltage back-injection from damaging the first DC / DC conversion unit, the second anti-blocking element is used to prevent high-voltage back-injection from damaging the second DC / DC conversion unit, and the first switching circuit and the second switching circuit are used to cooperate to protect the second DC / DC conversion unit to prevent back-injection damage due to the failure of the second anti-blocking element to output high voltage; when the first switching circuit is closed and the second switching circuit is disconnected, the first DC / DC conversion unit and the second DC / DC conversion unit are connected in parallel; when the first switching circuit is disconnected and the second switching circuit is closed, the first DC / DC conversion unit and the second DC / DC conversion unit are connected in series.

[0005] Optionally, in one embodiment of the present invention, the first switching circuit includes a first relay and a second relay, the second switching circuit includes a third relay and a fourth relay, the first relay is connected between one end of the second anti-blocking element and the positive output end of the second DC / DC conversion unit, the second relay is connected between the negative output end of the first DC / DC conversion unit and the output negative pole of the output series-parallel switching circuit, and the third relay and the fourth relay are both connected between the negative output end of the first DC / DC conversion unit and the positive output end of the second DC / DC conversion unit.

[0006] Optionally, in one embodiment of the present invention, a sampling unit is further included, and the sampling unit is used to obtain a first sampling voltage and a second sampling voltage, wherein the first sampling voltage is a sampling voltage between a first sampling point and a second sampling point, and the second sampling voltage is a sampling voltage between a third sampling point and a second sampling point. The first sampling point is set between the positive output end of the first DC / DC conversion unit and one end of the first anti-blocking element, the second sampling point is set between the negative output end of the second DC / DC conversion unit and the output negative pole of the output series-parallel switching circuit, and the third sampling point is set between one end of the second anti-blocking element and the first relay.

[0007] In a second aspect, an embodiment of the present invention provides a control method for the output series-parallel switching circuit as described in the first aspect, comprising:

[0008] Acquire the real-time output voltage of the output series-parallel switching circuit, and determine the series-parallel state of the first DC / DC conversion unit and the second DC / DC conversion unit;

[0009] The working state of the output series-parallel switching circuit is controlled according to the real-time output voltage and the series-parallel state of the first DC / DC conversion unit and the second DC / DC conversion unit.

[0010] Optionally, in one embodiment of the present invention, controlling the working state of the output series-parallel switching circuit according to the real-time output voltage and the series-parallel state of the first DC / DC conversion unit and the second DC / DC conversion unit includes:

[0011] When the first DC / DC conversion unit and the second DC / DC conversion unit are connected in parallel and the real-time output voltage is greater than a preset switching voltage threshold, the first DC / DC conversion unit and the second DC / DC conversion unit are turned off, and the real-time output voltage is discharged to obtain a corrected output voltage;

[0012] When the corrected output voltage is less than a preset discharge voltage threshold, the first switch circuit is disconnected; after a first preset delay time, the second switch circuit is closed; after a second preset delay time, the first DC / DC conversion unit and the second DC / DC conversion unit are turned on.

[0013] Optionally, in one embodiment of the present invention, controlling the working state of the output series-parallel switching circuit according to the real-time output voltage and the series-parallel state of the first DC / DC conversion unit and the second DC / DC conversion unit includes:

[0014] When the first DC / DC conversion unit and the second DC / DC conversion unit are connected in series and the real-time output voltage is less than or equal to a preset switching voltage threshold, the first DC / DC conversion unit and the second DC / DC conversion unit are turned off, and the real-time output voltage is discharged to obtain a corrected output voltage;

[0015] When the corrected output voltage is less than a preset discharge voltage threshold, the second switch circuit is disconnected; after a delay of a third preset time, the first switch circuit is closed; after a delay of a fourth preset time, the first DC / DC conversion unit and the second DC / DC conversion unit are turned on.

[0016] Optionally, in one embodiment of the present invention, it further includes:

[0017] When the first DC / DC conversion unit and the second DC / DC conversion unit are connected in series, the sampling unit is controlled to obtain a first sampling voltage and a second sampling voltage;

[0018] Calculating a difference between the first sampling voltage and the second sampling voltage;

[0019] The working state of the output series-parallel switching circuit is controlled according to the difference between the first sampling voltage and the second sampling voltage.

[0020] Optionally, in one embodiment of the present invention, controlling the working state of the output series-parallel switching circuit according to the difference between the first sampling voltage and the second sampling voltage includes:

[0021] When the difference between the first sampling voltage and the second sampling voltage is within a preset sampling voltage difference range, the first DC / DC conversion unit and the second DC / DC conversion unit are turned off, a fault alarm message is generated, and the first switch circuit is disconnected;

[0022] or,

[0023] When the difference between the first sampling voltage and the second sampling voltage is not within a preset sampling voltage difference range, the current working state of the output series-parallel switching circuit is maintained.

[0024] In a third aspect, an embodiment of the present invention provides an electronic device, including:

[0025] at least one processor;

[0026] at least one memory for storing at least one program;

[0027] When at least one of the programs is executed by at least one of the processors, the control method of the output series-parallel switching circuit as described in the second aspect is implemented.

[0028] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores a program executable by a processor, and when the program executable by the processor is executed by the processor, it is used to implement the control method of the output series-parallel switching circuit as described in the second aspect.

[0029] Compared with the related prior art, the output series-parallel switching circuit and control method thereof, electronic device, and storage medium proposed in the present invention not only provide a first anti-blocking element and a second anti-blocking element to prevent high-voltage reverse injection from damaging the corresponding DC / DC conversion unit, but also provide a first switch circuit and a second switch circuit to cooperate in protecting the second DC / DC conversion unit to prevent the second DC / DC conversion unit from being damaged by reverse injection due to the failure of the second anti-blocking element to output high voltage, thereby improving the safety and reliability of the charging module during operation, and through the combined shutdown of the first switch circuit and the second switch circuit, the series-parallel state switching control of the first DC / DC conversion unit and the second DC / DC conversion unit can be realized, especially according to the real-time output voltage of the output series-parallel switching circuit and the series-parallel state of the corresponding DC / DC conversion unit, the working state of the output series-parallel switching circuit can be controlled, thereby ensuring that the charging module can maintain a good working state during real-time operation, further improving the safety and reliability of the charging module during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a circuit schematic diagram of an output series-parallel switching circuit provided in one embodiment of the present invention.

[0031] Figure 2 is a circuit schematic diagram of an output series-parallel switching circuit in a parallel state provided by an embodiment of the present invention;

[0032] Figure 3 is a circuit principle diagram of an output series-parallel switching circuit provided by an embodiment of the present invention in a series state;

[0033] Figure 4 is a sampling schematic diagram of a first sampling voltage and a second sampling voltage provided by an embodiment of the present invention;

[0034] Figure 5 is a flow chart of a control method for an output series-parallel switching circuit provided by an embodiment of the present invention;

[0035] Figure 6 yes Figure 5 A flow chart of step S2000 in FIG.

[0036] Figure 7 yes Figure 6 Schematic diagram of the execution flow of steps S2100 to S2200 in FIG.

[0037] Figure 8 yes Figure 5 Another flow chart of step S2000 in FIG.

[0038] Fig. 9 yes Figure 8 Schematic diagram of the execution flow of steps S2300 to S2400 in FIG.

[0039] Fig.10 is a flow chart of a control method of an output series-parallel switching circuit provided by another embodiment of the present invention;

[0040] Fig.11 is a schematic diagram of the execution flow of step S5100 or S5200;

[0041] Fig.12 It is a structural schematic diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0043] It should be noted that although the functional modules are divided in the device schematic and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart.

[0044] like Figure 1 As shown, the output series-parallel switching circuit specifically includes but is not limited to:

[0045] A first DC / DC conversion unit for outputting a converted first DC voltage, a second DC / DC conversion unit for outputting a converted second DC voltage, a first switch circuit 100, a second switch circuit 200, a first anti-blocking element D1 and a second anti-blocking element D2, wherein one end of the first anti-blocking element D1 is connected to the positive output end of the first DC / DC conversion unit, and the other end is connected to the output positive electrode Vo+ of the output series-parallel switching circuit; one end of the second anti-blocking element D2 is connected to the output positive electrode Vo+ of the output series-parallel switching circuit, and the other end is connected to the positive output end of the second DC / DC conversion unit through the first switch circuit 100; the first switch circuit 100 is connected between the negative output end of the first DC / DC conversion unit and the positive output end of the second DC / DC conversion unit, and the negative output end of the second DC / DC conversion unit is connected to the output negative electrode Vo- of the output series-parallel switching circuit;

[0046] The first anti-blocking element D1 is used to prevent the first DC / DC conversion unit from being damaged by reverse injection of high voltage, the second anti-blocking element D2 is used to prevent the second DC / DC conversion unit from being damaged by reverse injection of high voltage, and the first switch circuit 100 and the second switch circuit 200 are used to cooperate to protect the second DC / DC conversion unit from being damaged by reverse injection due to the failure of the second anti-blocking element D2 to output high voltage; when the first switch circuit 100 is closed and the second switch circuit 200 is opened, the first DC / DC conversion unit and the second DC / DC conversion unit are connected in parallel; when the first switch circuit 100 is opened and the second switch circuit 200 is closed, the first DC / DC conversion unit and the second DC / DC conversion unit are connected in series.

[0047] It can be seen that, compared with the related prior art, not only the first anti-blocking element D1 and the second anti-blocking element D2 are provided to prevent the corresponding DC / DC conversion unit from being damaged by back-injection of high voltage, but also the first switch circuit 100 and the second switch circuit 200 are provided to cooperate in protecting the second DC / DC conversion unit to prevent the second DC / DC conversion unit from being damaged by back-injection due to failure of the second anti-blocking element D2 to output high voltage, thereby improving the safety and reliability of the charging module during operation, and through the combined shutdown of the first switch circuit 100 and the second switch circuit 200, the series-parallel state switching control of the first DC / DC conversion unit and the second DC / DC conversion unit can be realized, which improves the safety and reliability of the charging module during operation.

[0048] In one embodiment, the first switch circuit 100 includes a first relay K11 and a second relay K12, and the second switch circuit 200 includes a third relay K21 and a fourth relay K22. The first relay K11 is connected between one end of the second anti-blocking element D2 and the positive output end of the second DC / DC conversion unit, and the second relay K12 is connected between the negative output end of the first DC / DC conversion unit and the output negative pole Vo- of the output series-parallel switching circuit. The third relay K21 and the fourth relay K22 are both connected between the negative output end of the first DC / DC conversion unit and the positive output end of the second DC / DC conversion unit. In addition to relays, switching devices such as MOSFET and IGBT can also be used but are not limited to them, which are not limited here.

[0049] Specifically, Figure 2As shown, when the charging modules work in parallel, the first switch circuit 100 is closed and the second switch circuit 200 is open, the first anti-blocking element D1 and the second anti-blocking element D2 are both involved in the work, the first relay K11 and the second relay K12 are both in a closed state, and the third relay K21 and the fourth relay K22 are both in an open state, wherein I is the total output current, I1 is the output current of the first DC / DC conversion unit, and I2 is the output current of the second DC / DC conversion unit, I=I1+I2, at this time, the current flowing through the first anti-blocking element D1 is I1, and the current flowing through the second anti-blocking element D2 is I2; Figure 3 As shown, when the charging modules work in series, the first switch circuit 100 is disconnected and the second switch circuit 200 is closed. Since the first relay K11 is in an open state, only the first anti-blocking element D1 is involved in the work. At this time, the current flowing through the first DC / DC conversion unit and the second DC / DC conversion unit is I.

[0050] In one embodiment, the specific models and parameters of the first DC / DC conversion unit and the second DC / DC conversion unit can be set by those skilled in the art according to different application scenarios. For example, in addition to the DC / DC conversion unit, other types of charging modules can also be considered, which are not limited here; the first anti-blocking element D1 and the second anti-blocking element D2 can be, but are not limited to, Figures 1 to 3 Any of the anti-blocking diodes shown in or a switching device with similar functions.

[0051] In one embodiment, the output series-parallel switching circuit may also include, but is not limited to, a sampling unit, the sampling unit is used to obtain a first sampling voltage and a second sampling voltage, wherein, Figure 4 As shown, the first sampling voltage is the sampling voltage between the first sampling point and the second sampling point, the second sampling voltage is the sampling voltage between the third sampling point and the second sampling point, the first sampling point is set between the positive output end of the first DC / DC conversion unit and one end of the first anti-blocking element D1, the second sampling point is set between the negative output end of the second DC / DC conversion unit and the output negative electrode Vo- of the output series-parallel switching circuit, and the third sampling point is set between one end of the second anti-blocking element D2 and the first relay K11; it should be noted that the specific model, parameters, etc. of the sampling unit can be set by those skilled in the art according to different application scenarios, and will not be repeated here.

[0052] It should be noted that the output series-parallel switching circuit and application scenario described in the embodiment of the present invention are for the purpose of more clearly illustrating the technical solution of the embodiment of the present invention, and do not constitute a limitation on the technical solution provided by the embodiment of the present invention. Those skilled in the art can know that with the evolution of the output series-parallel switching circuit and the emergence of new application scenarios, the technical solution provided by the embodiment of the present invention is also applicable to similar technical problems.

[0053] Figure 5 A flow chart of a control method for an output series-parallel switching circuit provided by an embodiment of the present invention. The control method can be but is not limited to being applied to Figures 1 to 4 The output series-parallel switching circuit shown in any embodiment is as follows: Figure 5 As shown, it specifically includes but is not limited to steps S1000 to S2000.

[0054] Step S1000, obtaining the real-time output voltage of the output series-parallel switching circuit, and determining the series-parallel state of the first DC / DC conversion unit and the second DC / DC conversion unit;

[0055] Step S2000: Control the working state of the output series-parallel switching circuit according to the real-time output voltage and the series-parallel state of the first DC / DC conversion unit and the second DC / DC conversion unit.

[0056] In this step, the working state of the output series-parallel switching circuit is controlled according to the real-time output voltage of the output series-parallel switching circuit and the series-parallel state of the corresponding DC / DC conversion unit, thereby ensuring that the charging module can maintain a good working state during real-time operation, further improving the safety and reliability of the charging module during operation.

[0057] One embodiment of the present invention, as Figure 6 As shown, step S2000 may include but is not limited to steps S2100 to S2200.

[0058] Step S2100: when the first DC / DC conversion unit and the second DC / DC conversion unit are connected in parallel and the real-time output voltage is greater than a preset switching voltage threshold, the first DC / DC conversion unit and the second DC / DC conversion unit are turned off, and the real-time output voltage is discharged to obtain a corrected output voltage;

[0059] Step S2200, when the corrected output voltage is less than the preset discharge voltage threshold, the first switch circuit 100 is disconnected; after a first preset delay time, the second switch circuit 200 is closed; after a second preset delay time, the first DC / DC conversion unit and the second DC / DC conversion unit are turned on.

[0060] Specifically, Figure 7As shown, as the real-time output voltage continues to rise, it is first determined whether the real-time output voltage of the charging module reaches a preset switching voltage threshold. The preset switching voltage threshold can be selected according to different application scenarios, and is not limited here. The embodiment of the present application takes 500V as an example. When the real-time output voltage is less than or equal to 500V, the switching logic is not executed. Otherwise, when the real-time output voltage is greater than 500V, the output of each DC / DC conversion unit is automatically turned off, and then the preset output discharge circuit is started to work. The output discharge circuit can be set accordingly by those skilled in the art according to different application scenarios, and will not be repeated here; the real-time output voltage is discharged through the output discharge circuit to discharge the residual pressure on each DC / DC conversion unit to below the preset discharge voltage threshold (the embodiment of the present application takes 60V as an example). In this process, it is detected in real time whether the corrected output voltage is less than 60V. If it is greater than or equal to 60V, the output discharge circuit is started again. The parallel switching action is started only when the voltage less than 60V is detected, that is, the first relay K11 and the second relay K12 are disconnected first, and then the first preset time length T1 is delayed, and then the third relay K21 and the fourth relay K22 are closed, and then the second preset time length T2 is delayed, and finally the charging module is soft-started, and the first DC / DC conversion unit and the second DC / DC conversion unit are turned on, and the parallel state is switched to the series state, wherein the values ​​of T1 and T2 need to be selected accordingly with reference to the parameters and specifications of the relays, for example, it can be selected but not limited to about 100ms, which is not limited here; through the above-mentioned delay operation, it is ensured that the first switch circuit 100 and the second switch circuit 200 will not act at the same time, so as to prevent the second DC / DC conversion unit from being short-circuited. This is because there is residual pressure on the second DC / DC conversion unit, and there may be a risk of contact adhesion caused by overcurrent when the third relay K21 and the fourth relay K22 are closed.

[0061] One embodiment of the present invention, as Figure 8 As shown, step S2000 may include but is not limited to steps S2300 to S2400.

[0062] Step S2300: when the first DC / DC conversion unit and the second DC / DC conversion unit are connected in series and the real-time output voltage is less than or equal to the preset switching voltage threshold, the first DC / DC conversion unit and the second DC / DC conversion unit are turned off, and the real-time output voltage is discharged to obtain a corrected output voltage;

[0063] Step S2400, when the corrected output voltage is less than the preset discharge voltage threshold, disconnect the second switch circuit 200; after a delay of a third preset time, open the first switch circuit 100; after a delay of a fourth preset time, open the first DC / DC conversion unit and the second DC / DC conversion unit.

[0064] Specifically, Fig. 9 As shown, as the real-time output voltage continues to rise, it is first determined whether the real-time output voltage of the charging module is less than or equal to the preset switching voltage threshold. The preset switching voltage threshold can be selected accordingly according to different application scenarios, and is not limited here. The embodiment of the present application takes 500V as an example. When the real-time output voltage is greater than 500V, the switching logic is not executed. Otherwise, when the real-time output voltage is less than or equal to 500V, the output of each DC / DC conversion unit is automatically turned off, and then the preset output discharge circuit is started to work, so as to discharge the real-time output voltage through the output discharge circuit, thereby discharging the residual pressure on each DC / DC conversion unit to below the preset discharge voltage threshold (the embodiment of the present application takes 60V as an example). In this process, it is detected in real time whether the corrected output voltage is less than 60V. If it is greater than or equal to 60V, the output discharge circuit is continued to be started to work until it is detected that it is less than 60V. The series switching action is started, that is, the third relay K21 and the fourth relay K22 are first disconnected, and then the third preset time length T3 is delayed, and then the first relay K11 and the second relay K12 are closed, and then the fourth preset time length T4 is delayed, and finally the charging module is soft-started, and the first DC / DC conversion unit and the second DC / DC conversion unit are turned on, and the series state is switched to the parallel state, wherein the values ​​of T3 and T4 need to be selected accordingly with reference to the parameters and specifications of the relays, for example, it can be selected but not limited to about 100ms, which is not limited here; through the above-mentioned delay operation, it is ensured that the first switch circuit 100 and the second switch circuit 200 will not act at the same time, and the second DC / DC conversion unit is prevented from being short-circuited. This is because there is residual pressure on the second DC / DC conversion unit, and there may be a risk of contact adhesion caused by overcurrent when the third relay K21 and the fourth relay K22 are closed.

[0065] One embodiment of the present invention, as Fig.10 As shown, the control method may also include but is not limited to steps S3000 to S5000.

[0066] Step S3000: When the first DC / DC conversion unit and the second DC / DC conversion unit are connected in series, the sampling unit is controlled to obtain the first sampling voltage and the second sampling voltage;

[0067] Step S4000, calculating the difference between the first sampling voltage and the second sampling voltage;

[0068] Step S5000: Control the working state of the output series-parallel switching circuit according to the difference between the first sampling voltage and the second sampling voltage.

[0069] In this step, the actual output state of the output series-parallel switching circuit is determined by calculating the difference between the first sampling voltage and the second sampling voltage, and the working state of the output series-parallel switching circuit can be further controlled according to the actual output state of the output series-parallel switching circuit, so that the working state of the output series-parallel switching circuit can be switched to the currently required working state, thereby improving the safety and reliability of the charging module during operation.

[0070] In one embodiment of the present invention, step S5000 may include but is not limited to step S5100 or S5200.

[0071] Step S5100: when the difference between the first sampling voltage and the second sampling voltage is within a preset sampling voltage difference range, the first DC / DC conversion unit and the second DC / DC conversion unit are turned off, a fault alarm message is generated, and the first switch circuit 100 is disconnected;

[0072] or,

[0073] Step S5200: When the difference between the first sampling voltage and the second sampling voltage is not within the preset sampling voltage difference range, the current working state of the output series-parallel switching circuit is maintained.

[0074] In this step, refer to Fig.11 When the difference between the first sampling voltage and the second sampling voltage is within the preset sampling voltage difference range, it means that the first sampling voltage and the second sampling voltage can be regarded as approximately equal. In this case, it can be considered that the second anti-blocking element D2 has failed. At this time, the first DC / DC conversion unit and the second DC / DC conversion unit are turned off, and a fault alarm message is generated. The first switch circuit 100 is disconnected to ensure that the second DC / DC conversion unit will not be damaged and ignited due to high-voltage reverse injection at the output end when the charging module works in parallel next time, further increasing the operating safety of the charging module; on the contrary, when the difference between the first sampling voltage and the second sampling voltage is not within the preset sampling voltage difference range, it means that the second anti-blocking element D2 has not failed, and the normal working state of the output series-parallel switching circuit can be maintained at this time.

[0075] Fig.12 FIG. 1 is a schematic diagram of the structure of an electronic device 1000 provided by an embodiment of the present invention. Fig.12 As shown, the electronic device 1000 includes a memory 1100 and a processor 1200. The number of the memory 1100 and the processor 1200 may be one or more. Fig.12 In the embodiment, a memory 1100 and a processor 1200 are taken as an example; the memory 1100 and the processor 1200 in the device may be connected via a bus or other means. Fig.12 The example of connecting through bus is taken in the following.

[0076] The memory 1100, as a computer-readable storage medium, can be used to store software programs, computer executable programs and modules, such as program instructions / modules corresponding to the control method of the output series-parallel switching circuit provided in any embodiment of the present invention. The processor 1200 implements the control method of the output series-parallel switching circuit by running the software programs, instructions and modules stored in the memory 1100.

[0077] The memory 1100 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function. In addition, the memory 1100 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 1100 may further include a memory remotely arranged relative to the processor 1200, and these remote memories may be connected to the device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0078] An embodiment of the present invention further provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute a control method for an output series-parallel switching circuit as provided in any embodiment of the present invention.

[0079] An embodiment of the present invention further provides a computer program product, including a computer program or computer instructions, wherein the computer program or computer instructions are stored in a computer-readable storage medium, a processor of a computer device reads the computer program or computer instructions from the computer-readable storage medium, and the processor executes the computer program or computer instructions, so that the computer device executes a control method for an output series-parallel switching circuit as provided in any embodiment of the present invention.

[0080] The electronic devices and application scenarios described in the embodiments of the present invention are intended to more clearly illustrate the technical solutions of the embodiments of the present invention, and do not constitute a limitation on the technical solutions provided by the embodiments of the present invention. Those skilled in the art will appreciate that with the evolution of electronic devices and the emergence of new application scenarios, the technical solutions provided by the embodiments of the present invention are equally applicable to similar technical problems.

[0081] Those skilled in the art will appreciate that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices may be implemented as software, firmware, hardware, or a suitable combination thereof.

[0082] In hardware implementation, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0083] The terms "component", "module", "system", etc. used in this specification are used to represent computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program, or a computer. By way of illustration, both applications running on a computing device and a computing device can be components. One or more components may reside in a process or an execution thread, and a component may be located on a computer or distributed between two or more computers. In addition, these components may be executed from various computer-readable media having various data structures stored thereon. Components may communicate, for example, through local or remote processes based on signals having one or more data packets (e.g., data from two components interacting with another component between a local system, a distributed system, or a network, such as the Internet interacting with other systems through signals).

Claims

1. An output series-parallel switching circuit, characterized in that: The invention comprises a first DC / DC conversion unit for outputting a converted first DC voltage, a second DC / DC conversion unit for outputting a converted second DC voltage, a first switching circuit, a second switching circuit, a first anti-blocking element and a second anti-blocking element, wherein one end of the first anti-blocking element is connected to the positive output end of the first DC / DC conversion unit, and the other end is connected to the output positive electrode of the output series-parallel switching circuit; one end of the second anti-blocking element is connected to the output positive electrode of the output series-parallel switching circuit, and the other end is connected to the positive output end of the second DC / DC conversion unit through the first switching circuit; the first switching circuit is connected between the negative output end of the first DC / DC conversion unit and the positive output end of the second DC / DC conversion unit, and the second DC / DC conversion The negative output end of the conversion unit is connected to the output negative electrode of the output series-parallel switching circuit; wherein the first anti-blocking element is used to prevent high-voltage back-injection from damaging the first DC / DC conversion unit, and the second anti-blocking element is used to prevent high-voltage back-injection from damaging the second DC / DC conversion unit, and the first switch circuit and the second switch circuit are used to cooperate to protect the second DC / DC conversion unit to prevent back-injection damage due to the failure of the second anti-blocking element to output high voltage; when the first switch circuit is closed and the second switch circuit is disconnected, the first DC / DC conversion unit and the second DC / DC conversion unit are connected in parallel; when the first switch circuit is disconnected and the second switch circuit is closed, the first DC / DC conversion unit and the second DC / DC conversion unit are connected in series.

2. The output series-parallel switching circuit according to claim 1, characterized in that: The first switch circuit includes a first relay and a second relay, the second switch circuit includes a third relay and a fourth relay, the first relay is connected between one end of the second anti-blocking element and the positive output end of the second DC / DC conversion unit, the second relay is connected between the negative output end of the first DC / DC conversion unit and the output negative pole of the output series-parallel switching circuit, and the third relay and the fourth relay are both connected between the negative output end of the first DC / DC conversion unit and the positive output end of the second DC / DC conversion unit.

3. The output series-parallel switching circuit according to claim 2, characterized in that: The device further includes a sampling unit, which is used to obtain a first sampling voltage and a second sampling voltage, wherein the first sampling voltage is a sampling voltage between a first sampling point and a second sampling point, and the second sampling voltage is a sampling voltage between a third sampling point and a second sampling point. The first sampling point is set between the positive output end of the first DC / DC conversion unit and one end of the first anti-blocking element, the second sampling point is set between the negative output end of the second DC / DC conversion unit and the output negative pole of the output series-parallel switching circuit, and the third sampling point is set between one end of the second anti-blocking element and the first relay.

4. A control method for an output series-parallel switching circuit according to any one of claims 1 to 3, characterized in that: include: Acquire the real-time output voltage of the output series-parallel switching circuit, and determine the series-parallel state of the first DC / DC conversion unit and the second DC / DC conversion unit; The working state of the output series-parallel switching circuit is controlled according to the real-time output voltage and the series-parallel state of the first DC / DC conversion unit and the second DC / DC conversion unit.

5. The control method of the output series-parallel switching circuit according to claim 4, characterized in that: The controlling the working state of the output series-parallel switching circuit according to the real-time output voltage and the series-parallel state of the first DC / DC conversion unit and the second DC / DC conversion unit comprises: When the first DC / DC conversion unit and the second DC / DC conversion unit are connected in parallel and the real-time output voltage is greater than a preset switching voltage threshold, the first DC / DC conversion unit and the second DC / DC conversion unit are turned off, and the real-time output voltage is discharged to obtain a corrected output voltage; When the corrected output voltage is less than a preset discharge voltage threshold, the first switch circuit is disconnected; after a first preset delay time, the second switch circuit is closed; after a second preset delay time, the first DC / DC conversion unit and the second DC / DC conversion unit are turned on.

6. The control method of the output series-parallel switching circuit according to claim 4, characterized in that: The controlling the working state of the output series-parallel switching circuit according to the real-time output voltage and the series-parallel state of the first DC / DC conversion unit and the second DC / DC conversion unit comprises: When the first DC / DC conversion unit and the second DC / DC conversion unit are connected in series and the real-time output voltage is less than or equal to a preset switching voltage threshold, the first DC / DC conversion unit and the second DC / DC conversion unit are turned off, and the real-time output voltage is discharged to obtain a corrected output voltage; When the corrected output voltage is less than a preset discharge voltage threshold, the second switch circuit is disconnected; after a delay of a third preset time, the first switch circuit is closed; after a delay of a fourth preset time, the first DC / DC conversion unit and the second DC / DC conversion unit are turned on.

7. The control method of the output series-parallel switching circuit according to claim 4, characterized in that: Also includes: When the first DC / DC conversion unit and the second DC / DC conversion unit are connected in series, the sampling unit is controlled to obtain a first sampling voltage and a second sampling voltage; Calculating a difference between the first sampling voltage and the second sampling voltage; The working state of the output series-parallel switching circuit is controlled according to the difference between the first sampling voltage and the second sampling voltage.

8. The control method of the output series-parallel switching circuit according to claim 7, characterized in that: The step of controlling the working state of the output series-parallel switching circuit according to the difference between the first sampling voltage and the second sampling voltage includes: When the difference between the first sampling voltage and the second sampling voltage is within a preset sampling voltage difference range, the first DC / DC conversion unit and the second DC / DC conversion unit are turned off, a fault alarm message is generated, and the first switch circuit is disconnected; or, When the difference between the first sampling voltage and the second sampling voltage is not within a preset sampling voltage difference range, the current working state of the output series-parallel switching circuit is maintained.

9. An electronic device, characterized in that: include: at least one processor; at least one memory for storing at least one program; When at least one of the programs is executed by at least one of the processors, the control method of the output series-parallel switching circuit as described in any one of claims 4 to 8 is implemented.

10. A computer-readable storage medium, characterized in that: A program executable by a processor is stored therein, and when the program executable by the processor is executed by the processor, it is used to implement the control method of the output series-parallel switching circuit as described in any one of claims 4 to 8.

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