Flying capacitor clamp circuit, pre-charge method thereof and power supply device

Abstract

Embodiments of the present application provide a flying capacitor clamping circuit, a pre-charging method thereof and a power supply device. The flying capacitor clamping circuit comprises a bridge arm, a flying capacitor, a support capacitor, a fifth switch device and a sixth switch device. The bridge arm comprises a first switch device, a second switch device, a third switch device and a fourth switch device. The support capacitor comprises a first support capacitor and a second support capacitor. The support capacitor is divided into the first support capacitor and the second support capacitor connected in sequence. The first PWM signal and the second PWM signal are generated to control the on-off states of the first switch device and the sixth switch device and the on-off states of the fourth switch device and the fifth switch device, so as to charge and discharge the flying capacitor, and clamp the voltage across the flying capacitor through the first support capacitor and the second support capacitor. The pre-charging and the flying capacitor voltage control are solved by using the hardware clamping circuit, and the risk of software failure leading to the crash of the machine is reduced.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a flying capacitor clamping circuit, its pre-charging method, and a power supply device. Background Technology

[0002] In related technologies, three-level DC / DC circuits have outstanding advantages such as low switching voltage stress, small output filter inductance, and low loss, and are widely used in photovoltaic, energy storage, and fuel cell power generation. Meanwhile, the flying capacitor three-level circuit solves problems such as input / output non-common ground and large common-mode current, but there are certain difficulties in capacitor pre-charging and flying capacitor control. Specifically, in the flying capacitor FSBB (Four Switch Buck Boost) topology, existing technologies can use software control methods to make the voltage across the flying capacitor half the voltage across the supporting capacitor corresponding to that bridge arm. However, when the input / output voltage difference is small and the current is small, controlling the voltage across the flying capacitor using software control methods is very difficult. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a flying capacitor clamping circuit, its pre-charging method, and a power supply device, aiming to solve the problems of capacitor pre-charging and flying capacitor voltage control.

[0004] In a first aspect, embodiments of this application provide a pre-charging method for a flying capacitor clamping circuit. The flying capacitor clamping circuit includes a bridge arm, a flying capacitor, a supporting capacitor, a fifth switching device, and a sixth switching device. The bridge arm includes a first switching device, a second switching device, a third switching device, and a fourth switching device connected in sequence. The flying capacitor and the supporting capacitor are both connected to the bridge arm. The supporting capacitor includes a first supporting capacitor and a second supporting capacitor connected in sequence. One end of the fifth switching device and the sixth switching device are both connected to a common terminal between the first supporting capacitor and the second supporting capacitor. The other end of the fifth switching device is connected to one end of the flying capacitor, and the other end of the sixth switching device is connected to the other end of the flying capacitor. The method includes:

[0005] When the supporting capacitor is pre-charged, a first PWM signal and a second PWM signal are generated, wherein the first PWM signal and the second PWM signal are complementary PWM signals;

[0006] The on / off states of the first and sixth switching devices are synchronously controlled based on the first PWM signal to charge and discharge the flying capacitor.

[0007] The on / off states of the fourth and fifth switching devices are synchronously controlled based on the second PWM signal to charge and discharge the flying capacitor.

[0008] According to some embodiments of this application, the step of synchronously controlling the on / off states of the first switching device and the sixth switching device based on a first PWM signal to charge and discharge the flying capacitor includes:

[0009] The on / off states of the first and sixth switching devices are synchronously controlled based on the first PWM signal, and the flying capacitor is charged and discharged according to the voltage across the first supporting capacitor and the voltage across the flying capacitor.

[0010] According to some embodiments of this application, the charging and discharging of the flying capacitor based on the voltage across the first supporting capacitor and the voltage across the flying capacitor includes:

[0011] When the first switching device and the sixth switching device are in the on state, and the voltage across the first supporting capacitor is greater than the voltage across the flying capacitor, the flying capacitor is charged through the first charging circuit.

[0012] The first charging circuit includes the first switching device, the flying capacitor, the sixth switching device, and the second supporting capacitor.

[0013] According to some embodiments of this application, the charging and discharging of the flying capacitor based on the voltage across the first supporting capacitor and the voltage across the flying capacitor includes:

[0014] When the first switching device and the sixth switching device are in the on state, and the voltage across the first supporting capacitor is less than the voltage across the flying capacitor, the flying capacitor is discharged through the first discharge circuit.

[0015] The first discharge circuit includes the first switching device, the first supporting capacitor, the sixth switching device, and the flying capacitor.

[0016] According to some embodiments of this application, the step of synchronously controlling the on / off states of the fourth and fifth switching devices based on a second PWM signal to charge and discharge the flying capacitor includes:

[0017] The on / off states of the fourth and fifth switching devices are synchronously controlled based on the second PWM signal, and the flying capacitor is charged and discharged according to the voltage across the second supporting capacitor and the voltage across the flying capacitor.

[0018] According to some embodiments of this application, the charging and discharging of the flying capacitor based on the voltage across the second supporting capacitor and the voltage across the flying capacitor includes:

[0019] When the fourth and fifth switching devices are in the ON state, and the voltage across the second supporting capacitor is greater than the voltage across the flying capacitor, the flying capacitor is charged through the second charging circuit.

[0020] The second charging circuit includes the first supporting capacitor, the fifth switching device, the flying capacitor, and the fourth switching device.

[0021] According to some embodiments of this application, the charging and discharging of the flying capacitor based on the voltage across the second supporting capacitor and the voltage across the flying capacitor includes:

[0022] When the fourth and fifth switching devices are in the on state, and the voltage across the second supporting capacitor is less than the voltage across the flying capacitor, the flying capacitor is discharged through the second discharge circuit.

[0023] The second discharge circuit includes the fifth switching device, the second supporting capacitor, the fourth switching device, and the flying capacitor.

[0024] Secondly, embodiments of this application provide a flying capacitor clamping circuit for performing the pre-charging method of the flying capacitor clamping circuit as described in the first aspect above, the flying capacitor clamping circuit comprising:

[0025] The bridge arm includes a first switching device, a second switching device, a third switching device, and a fourth switching device connected in sequence;

[0026] A flying capacitor has one end connected to the common terminal between the first and second switching devices, and the other end connected to the common terminal between the third and fourth switching devices;

[0027] Support capacitors are connected to both ends of the bridge arm, and the support capacitors include a first support capacitor and a second support capacitor connected in sequence.

[0028] A fifth switching device and a sixth switching device, one end of which is connected to the common terminal between the first supporting capacitor and the second supporting capacitor, the other end of which is connected to one end of the flying capacitor, and the other end of which is connected to the other end of the flying capacitor.

[0029] According to some embodiments of this application, the flying capacitor clamping circuit further includes a first resistor, one end of which is connected to a common terminal between the first supporting capacitor and the second supporting capacitor, and the other end of which is connected to the fifth switching device and the sixth switching device.

[0030] According to some embodiments of this application, the fifth switching device and the sixth switching device are both MOS transistors carrying parasitic diodes. The source of the fifth switching device and the drain of the sixth switching device are both connected to the common terminal between the first supporting capacitor and the second supporting capacitor. The drain of the fifth switching device and the source of the sixth switching device are respectively connected to the two ends of the flying capacitor.

[0031] According to some embodiments of this application, both the fifth and sixth switching devices are switching relays.

[0032] Thirdly, embodiments of this application provide a controller, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the pre-charging method of the flying capacitor clamping circuit described in the first aspect when running the computer program.

[0033] Fourthly, embodiments of this application provide a power supply device including the flying capacitor clamping circuit described in the second aspect above.

[0034] Fifthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions for executing the flying capacitor clamping circuit and its pre-charging method as described in the first aspect above.

[0035] In a sixth aspect, embodiments of this application provide a computer program product, including a computer program or computer instructions, characterized in that 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, causing the computer device to perform the flying capacitor clamping circuit and its pre-charging method as described in the first aspect above.

[0036] According to the technical solution of this application embodiment, at least the following beneficial effects are achieved: This application embodiment separates the supporting capacitor into a first supporting capacitor and a second supporting capacitor connected in sequence. Simultaneously, by generating complementary first and second PWM signals, the on / off states of the first and sixth switching devices, as well as the on / off states of the fourth and fifth switching devices, are controlled respectively, thereby charging and discharging the flying capacitor. The voltage across the flying capacitor is clamped by the first and second supporting capacitors. Therefore, this application embodiment employs a hardware clamping circuit to solve the problems of pre-charging and flying capacitor voltage control, thereby reducing the risk of system crashes due to software failure.

[0037] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0038] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0039] Figure 1 This is a circuit diagram of a flying capacitor clamping circuit provided in one embodiment of this application;

[0040] Figure 2 This is a circuit diagram of a flying capacitor clamping circuit with a pre-charge module provided in one embodiment of this application;

[0041] Figure 3 This is a flowchart of a pre-charging method for a flying capacitor clamping circuit provided in one embodiment of this application;

[0042] Figure 4 yes Figure 3 A flowchart of a sub-step of one embodiment of step S320 shown;

[0043] Figure 5 This is a schematic diagram of the first charging circuit of a flying capacitor clamping circuit provided in one embodiment of this application;

[0044] Figure 6 This is a schematic diagram of the first discharge circuit of a flying capacitor clamping circuit provided in one embodiment of this application;

[0045] Figure 7 yes Figure 3 A flowchart of a sub-step of one embodiment of step S330 shown in the diagram;

[0046] Figure 8 This is a schematic diagram of the second charging circuit of a flying capacitor clamping circuit provided in one embodiment of this application;

[0047] Figure 9 This is a schematic diagram of the second discharge circuit of the flying capacitor clamping circuit provided in one embodiment of this application;

[0048] Figure 10 This is a schematic diagram of a controller for performing a pre-charging method for a flying capacitor clamping circuit according to an embodiment of this application. Detailed Implementation

[0049] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0050] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0051] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0052] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0053] In some cases, three-level DC / DC circuits offer significant advantages such as low switching voltage stress, small output filter inductance, and low losses, leading to their widespread application in photovoltaics, energy storage, and fuel cell power generation. Meanwhile, the flying capacitor three-level circuit solves problems such as non-common grounding of input and output and large common-mode current, but it presents challenges in capacitor pre-charging and flying capacitor control. Specifically, in the flying capacitor FSBB topology, existing technology can use software control to ensure that the voltage across the flying capacitor is half the voltage across the supporting capacitor corresponding to that arm. However, when the input-output voltage difference is small and the current is low, controlling the voltage across the flying capacitor using software is extremely difficult.

[0054] Based on the above, this application proposes a flying capacitor clamping circuit, its pre-charging method, and a power supply device to solve the problems of capacitor pre-charging and flying capacitor voltage control.

[0055] The various embodiments of the flying capacitor clamping circuit of this application will be further described below with reference to the accompanying drawings.

[0056] like Figure 1 As shown, Figure 1 This is a circuit diagram of a flying capacitor clamping circuit provided in one embodiment of this application.

[0057] In one embodiment, the flying capacitor C_f clamping circuit includes, but is not limited to, a bridge arm, a flying capacitor C_f, a supporting capacitor, a fifth switching device Q5, and a sixth switching device Q6. The bridge arm includes a first switching device Q1, a second switching device Q2, a third switching device Q3, and a fourth switching device Q4 connected in sequence. One end of the flying capacitor C_f is connected to the common terminal between the first switching device Q1 and the second switching device Q2, and the other end is connected to the common terminal between the third switching device Q3 and the fourth switching device Q4. The supporting capacitor is connected to both ends of the bridge arm.

[0058] In addition, in order to achieve voltage clamping of the flying capacitor C_f, the embodiments of this application will separate the supporting capacitors into a first supporting capacitor C_BUS+ and a second supporting capacitor C_BUS- connected in sequence. At the same time, a fifth switching device Q5 will be disposed between the common terminal between the first supporting capacitor C_BUS+ and the second supporting capacitor C_BUS- and one end of the flying capacitor C_f. Furthermore, a sixth switching device Q6 will be disposed between the common terminal between the first supporting capacitor C_BUS+ and the second supporting capacitor C_BUS- and the other end of the flying capacitor C_f.

[0059] In one embodiment, the flying capacitor C_f clamping circuit further includes, but is not limited to, a first resistor R1, one end of which is connected to the common terminal between the first supporting capacitor C_BUS+ and the second supporting capacitor C_BUS-, and the other end of which is connected to the fifth switching device Q5 and the sixth switching device Q6.

[0060] In one embodiment, the switching types of the fifth switching device Q5 and the sixth switching device Q6 include, but are not limited to, the following two:

[0061] For example, the fifth switching device Q5 and the sixth switching device Q6 are both MOSFETs with parasitic diodes. The source of the fifth switching device Q5 and the drain of the sixth switching device Q6 are both connected to the common terminal between the first supporting capacitor C_BUS+ and the second supporting capacitor C_BUS-. The drain of the fifth switching device Q5 and the source of the sixth switching device Q6 are respectively connected to the two ends of the flying capacitor C_f.

[0062] For example, the fifth switching device Q5 and the sixth switching device Q6 are both switching relays.

[0063] In one embodiment, such as Figure 2 As shown, the flying capacitor C_f clamping circuit also includes, but is not limited to, a pre-charge module, which is located on the input bus. The pre-charge module includes a main switch K1, an auxiliary switch K2, and a second resistor R2. The auxiliary switch K2 and the second resistor R2 are connected in series and then in parallel on both sides of the main switch K1.

[0064] Based on the hardware structure of the flying capacitor clamping circuit in the above embodiments, the following presents various embodiments of the flying capacitor three-level bidirectional buck-boost converter of this application.

[0065] In one embodiment, the input-side bridge arm of the flying capacitor three-level bidirectional buck-boost converter may employ the flying capacitor clamping circuit described in the above embodiment, and / or, the output-side bridge arm may employ the flying capacitor clamping circuit described in the above embodiment.

[0066] Based on the hardware structure of the flying capacitor clamping circuit in the above embodiments, the following presents various embodiments of the pre-charging method of the flying capacitor clamping circuit of this application.

[0067] like Figure 3 As shown, Figure 3 This is a flowchart of a pre-charging method for a flying capacitor clamping circuit provided in one embodiment of this application; the pre-charging method can be applied to the flying capacitor clamping circuit of any of the above embodiments, and the pre-charging method includes, but is not limited to, steps S310, S320 and S330.

[0068] Step S310: While the supporting capacitor is pre-charged, a first PWM signal and a second PWM signal are generated, wherein the first PWM signal and the second PWM signal are complementary PWM signals.

[0069] Step S320: Based on the first PWM signal, synchronously control the on / off state of the first switching device and the sixth switching device to charge and discharge the flying capacitor;

[0070] Step S330: Based on the second PWM signal, synchronously control the on / off states of the fourth and fifth switching devices to charge and discharge the flying capacitor.

[0071] In one embodiment, the supporting capacitor is divided into a first supporting capacitor and a second supporting capacitor connected in sequence. Simultaneously, complementary first and second PWM signals are generated to control the on / off states of the first and sixth switching devices, as well as the fourth and fifth switching devices, thereby charging and discharging the flying capacitor. The voltage across the flying capacitor is clamped by the first and second supporting capacitors. Therefore, this embodiment employs a hardware clamping circuit to solve the problems of pre-charging and flying capacitor voltage control, thereby reducing the risk of system crashes due to software failure.

[0072] In addition, such as Figure 4 As shown, Figure 4 yes Figure 3 The flowchart shows a sub-step of one embodiment of step S320; regarding the above step S320, it includes, but is not limited to, steps S410 and S420.

[0073] Step S410: Synchronously control the on / off state of the first switching device and the sixth switching device based on the first PWM signal;

[0074] Step S420: Charge and discharge the flying capacitor according to the voltage across the first supporting capacitor and the voltage across the flying capacitor.

[0075] In one embodiment, during the process of synchronously controlling the on / off states of the first and sixth switching devices based on the first PWM signal, when both the first and sixth switching devices are on, the voltage across the first supporting capacitor and the voltage across the flying capacitor are compared to determine whether to charge or discharge the flying capacitor.

[0076] In one embodiment, such as Figure 5 As shown, when the first switching device and the sixth switching device are in the on state, when the voltage across the first supporting capacitor is greater than the voltage across the flying capacitor, the flying capacitor is charged through the first charging circuit; wherein, the first charging circuit includes the first switching device, the flying capacitor, the sixth switching device, and the second supporting capacitor.

[0077] In one embodiment, such as Figure 6 As shown, when the first switching device and the sixth switching device are in the on state, when the voltage across the first supporting capacitor is less than the voltage across the flying capacitor, the flying capacitor is discharged through the first discharge circuit; wherein, the first discharge circuit includes the first switching device, the first supporting capacitor, the sixth switching device and the flying capacitor.

[0078] pass Figure 5 and Figure 6As shown, during the synchronous control of the first and sixth switching devices to switch on and off, the voltage across the flying capacitor will gradually approach the voltage across the first supporting capacitor. Since the voltage across the first supporting capacitor is half of the voltage across the supporting capacitor, which is half of the bus voltage, the voltage across the flying capacitor can be clamped and kept at half of the bus voltage.

[0079] In addition, such as Figure 7 As shown, Figure 7 yes Figure 3 The flowchart shows a sub-step of one embodiment of step S330 shown; regarding the above step S330, it includes, but is not limited to, steps S710 and S720.

[0080] Step S710: Synchronously control the on / off states of the fourth and fifth switching devices based on the second PWM signal;

[0081] Step S720: Charge and discharge the flying capacitor according to the voltage across the second supporting capacitor and the voltage across the flying capacitor.

[0082] In one embodiment, during the process of synchronously controlling the on / off states of the fourth and fifth switching devices based on the second PWM signal, when both the fourth and fifth switching devices are on, the voltage across the second supporting capacitor and the voltage across the flying capacitor are compared to determine whether to charge or discharge the flying capacitor.

[0083] In one embodiment, such as Figure 8 As shown, when the fourth and fifth switching devices are in the on state, and the voltage across the second supporting capacitor is greater than the voltage across the flying capacitor, the flying capacitor is charged through the second charging circuit; wherein, the second charging circuit includes the first supporting capacitor, the fifth switching device, the flying capacitor and the fourth switching device.

[0084] In one embodiment, such as Figure 9 As shown, when the fourth and fifth switching devices are in the on state, when the voltage across the second supporting capacitor is less than the voltage across the flying capacitor, the flying capacitor is discharged through the second discharge circuit; wherein, the second discharge circuit includes the fifth switching device, the second supporting capacitor, the fourth switching device, and the flying capacitor.

[0085] pass Figure 8 and Figure 9As shown, during the synchronous control of the fourth and fifth switching devices, the voltage across the flying capacitor gradually approaches the voltage across the second supporting capacitor. Since the voltage across the second supporting capacitor is half the voltage across the supporting capacitor, which is half the bus voltage, the voltage across the flying capacitor can be clamped and maintained at half the bus voltage.

[0086] Based on the pre-charging method of the flying capacitor clamping circuit in the above embodiments, the overall embodiments of the pre-charging method of the flying capacitor clamping circuit of this application are presented below.

[0087] In one embodiment, a capacitor pre-charging circuit is used. When the BUS capacitor (i.e., the supporting capacitor composed of C_BUS+ and C_BUS-) is pre-charged, the switching devices Q1 and Q4 switch in a complementary manner with a duty cycle of 0.5. This ensures that the voltage of the flying capacitor C_f is always half of the voltage of the BUS capacitor and that the voltage rises slowly.

[0088] In this process, the power supply / battery current slowly charges the BUS capacitor through the second resistor, causing the BUS capacitor voltage to rise slowly. Once the BUS capacitor voltage equals the power supply / battery voltage, the main circuit switch K1 is automatically closed, completing the pre-charging process. During the BUS capacitor pre-charging process, according to the implementation method of this application embodiment, the C_f voltage can always be clamped at half of the BUS capacitor voltage. Specifically, from the above... Figure 5 , Figure 6 , Figure 8 and Figure 9 As shown in the charging and discharging path, the voltage of capacitor C_f will be clamped by the voltages of capacitors C_BUS+ and C_BUS-. When the voltages of capacitors C_BUS+ and C_BUS- are balanced, it can be ensured that the voltage of C_f is half of the bus voltage.

[0089] In addition, switching devices Q5 and Q4 use the same control signal or the same control signal source, and switching devices Q6 and Q1 use the same control signal or the same control signal source.

[0090] In addition, the switching devices Q5 and Q6 can be semiconductor devices such as IGBT (Insulated Gate Bipolar Transistor), MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), DIODE (Diode), etc., or they can be relays or other switching devices.

[0091] Based on the pre-charging method of the flying capacitor clamping circuit in the above embodiments, the following presents various embodiments of the controller, flying capacitor clamping circuit, power supply device, computer-readable storage medium, and computer program product of this application.

[0092] like Figure 10As shown, Figure 10 This is a schematic diagram of a controller for performing a pre-charging method for a flying capacitor clamping circuit according to an embodiment of this application. The controller 100 implemented in this application includes: a processor 110, a memory 120, and a computer program stored in the memory 120 and executable on the processor 110, wherein... Figure 10 The example uses a processor 110 and a memory 120.

[0093] Processor 110 and memory 120 can be connected via a bus or other means. Figure 10 Taking the example of a connection between China and Israel via a bus.

[0094] Memory 120, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory 120 may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory 120 may optionally include remotely located memories 120 relative to processor 110, which can be connected to controller 100 via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0095] Those skilled in the art will understand that Figure 10 The device structure shown does not constitute a limitation on the controller 100 and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0096] exist Figure 10 In the controller 100 shown, the processor 110 can be used to call the control program stored in the memory 120, thereby implementing the pre-charging method of the flying capacitor clamping circuit described above. Specifically, the non-transient software program and instructions required to implement the pre-charging method of the flying capacitor clamping circuit in the above embodiment are stored in the memory 120. When executed by the processor 110, the pre-charging method of the flying capacitor clamping circuit in the above embodiment is executed.

[0097] It is worth noting that since the controller 100 of this application embodiment can execute the pre-charging method of the flying capacitor clamping circuit of any of the above embodiments, the specific implementation and technical effects of the controller 100 of this application embodiment can refer to the specific implementation and technical effects of the pre-charging method of the flying capacitor clamping circuit of any of the above embodiments.

[0098] Furthermore, one embodiment of this application also provides a flying capacitor clamping circuit, which includes the controller described in the above embodiment.

[0099] It is worth noting that, since the flying capacitor clamping circuit of this application embodiment includes the controller of the above embodiment, and the controller of the above embodiment is capable of executing the pre-charging method of the flying capacitor clamping circuit of any of the above embodiments, the specific implementation method and technical effect of the flying capacitor clamping circuit of this application embodiment can refer to the specific implementation method and technical effect of the pre-charging method of the flying capacitor clamping circuit of any of the above embodiments.

[0100] Furthermore, one embodiment of this application also provides a power supply device that includes the flying capacitor clamping circuit described in the above embodiment.

[0101] It is worth noting that, since the power supply device of this application embodiment includes the flying capacitor clamping circuit of the above embodiment, and the flying capacitor clamping circuit of the above embodiment includes the controller of the above embodiment, and the controller of the above embodiment is capable of executing the pre-charging method of the flying capacitor clamping circuit of any of the above embodiments, the specific implementation method and technical effect of the power supply device of this application embodiment can refer to the specific implementation method and technical effect of the pre-charging method of the flying capacitor clamping circuit of any of the above embodiments.

[0102] Furthermore, one embodiment of this application provides a computer-readable storage medium storing computer-executable instructions for performing the pre-charging method of the flying capacitor clamping circuit described above. Exemplarily, the above-described... Figure 3 , Figure 4 and Figure 7 The methods and steps in the text.

[0103] It is worth noting that, since the computer-readable storage medium of this application embodiment is capable of executing the pre-charging method of the flying capacitor clamping circuit of any of the above embodiments, the specific implementation and technical effects of the computer-readable storage medium of this application embodiment can be referred to the specific implementation and technical effects of the pre-charging method of the flying capacitor clamping circuit of any of the above embodiments.

[0104] Furthermore, one embodiment of this application also provides a computer program product, including a computer program or computer instructions, which 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 executes the computer program or computer instructions, causing the computer device to perform the pre-charging method of the flying capacitor clamping circuit described above. Exemplarily, the above-described method is performed... Figure 3 , Figure 4 and Figure 7 The methods and steps in the text.

[0105] It is worth noting that, since the computer program product of this application embodiment can execute the pre-charging method of the flying capacitor clamping circuit of any of the above embodiments, the specific implementation method and technical effect of the computer program product of this application embodiment can refer to the specific implementation method and technical effect of the pre-charging method of the flying capacitor clamping circuit of any of the above embodiments.

[0106] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media 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 includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically include computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0107] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0108] In the several embodiments provided in this application, it should be understood that the disclosed systems, instruments, and methods can be implemented in other ways. For example, the instrument embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between instruments or units may be electrical, mechanical, or other forms. Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0109] It should also be understood that the various implementation methods provided in this application can be combined arbitrarily to achieve different technical effects.

[0110] The above provides a detailed description of the preferred embodiments of this application. However, this application is not limited to the above-described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A pre-charging method for a flying capacitor clamping circuit, characterized in that, The flying capacitor clamping circuit includes a bridge arm, a flying capacitor, a supporting capacitor, a fifth switching device, and a sixth switching device. The bridge arm includes a first switching device, a second switching device, a third switching device, and a fourth switching device connected in sequence. The flying capacitor and the supporting capacitor are both connected to the bridge arm. The supporting capacitor includes a first supporting capacitor and a second supporting capacitor connected in sequence. One end of the fifth switching device and the sixth switching device are both connected to a common terminal between the first supporting capacitor and the second supporting capacitor. The other end of the fifth switching device is connected to one end of the flying capacitor, and the other end of the sixth switching device is connected to the other end of the flying capacitor. The method includes: When the supporting capacitor is pre-charged, a first PWM signal and a second PWM signal are generated, wherein the first PWM signal and the second PWM signal are complementary PWM signals; The on / off states of the first and sixth switching devices are synchronously controlled based on the first PWM signal to charge and discharge the flying capacitor. The on / off states of the fourth and fifth switching devices are synchronously controlled based on the second PWM signal to charge and discharge the flying capacitor.

2. The method according to claim 1, characterized in that, The method of synchronously controlling the on / off states of the first and sixth switching devices based on the first PWM signal to charge and discharge the flying capacitor includes: The on / off states of the first and sixth switching devices are synchronously controlled based on the first PWM signal, and the flying capacitor is charged and discharged according to the voltage across the first supporting capacitor and the voltage across the flying capacitor.

3. The method according to claim 2, characterized in that, The step of charging and discharging the flying capacitor based on the voltage across the first supporting capacitor and the voltage across the flying capacitor includes: When the first switching device and the sixth switching device are in the on state, and the voltage across the first supporting capacitor is greater than the voltage across the flying capacitor, the flying capacitor is charged through the first charging circuit. The first charging circuit includes the first switching device, the flying capacitor, the sixth switching device, and the second supporting capacitor.

4. The method according to claim 2, characterized in that, The step of charging and discharging the flying capacitor based on the voltage across the first supporting capacitor and the voltage across the flying capacitor includes: When the first switching device and the sixth switching device are in the on state, and the voltage across the first supporting capacitor is less than the voltage across the flying capacitor, the flying capacitor is discharged through the first discharge circuit. The first discharge circuit includes the first switching device, the first supporting capacitor, the sixth switching device, and the flying capacitor.

5. The method according to claim 1, characterized in that, The method of synchronously controlling the on / off states of the fourth and fifth switching devices based on the second PWM signal to charge and discharge the flying capacitor includes: The on / off states of the fourth and fifth switching devices are synchronously controlled based on the second PWM signal, and the flying capacitor is charged and discharged according to the voltage across the second supporting capacitor and the voltage across the flying capacitor.

6. The method according to claim 5, characterized in that, The step of charging and discharging the flying capacitor based on the voltage across the second supporting capacitor and the voltage across the flying capacitor includes: When the fourth and fifth switching devices are in the ON state, and the voltage across the second supporting capacitor is greater than the voltage across the flying capacitor, the flying capacitor is charged through the second charging circuit. The second charging circuit includes the first supporting capacitor, the fifth switching device, the flying capacitor, and the fourth switching device.

7. The method according to claim 5, characterized in that, The step of charging and discharging the flying capacitor based on the voltage across the second supporting capacitor and the voltage across the flying capacitor includes: When the fourth and fifth switching devices are in the on state, and the voltage across the second supporting capacitor is less than the voltage across the flying capacitor, the flying capacitor is discharged through the second discharge circuit. The second discharge circuit includes the fifth switching device, the second supporting capacitor, the fourth switching device, and the flying capacitor.

8. A flying capacitor clamping circuit, characterized in that, A pre-charging method for performing a flying capacitor clamping circuit as described in any one of claims 1 to 7, the flying capacitor clamping circuit comprising: The bridge arm includes a first switching device, a second switching device, a third switching device, and a fourth switching device connected in sequence; A flying capacitor has one end connected to the common terminal between the first and second switching devices, and the other end connected to the common terminal between the third and fourth switching devices; Support capacitors are connected to both ends of the bridge arm, and the support capacitors include a first support capacitor and a second support capacitor connected in sequence. A fifth switching device and a sixth switching device, one end of which is connected to the common terminal between the first supporting capacitor and the second supporting capacitor, the other end of which is connected to one end of the flying capacitor, and the other end of which is connected to the other end of the flying capacitor.

9. The flying capacitor clamping circuit according to claim 8, characterized in that, The flying capacitor clamping circuit further includes a first resistor, one end of which is connected to the common terminal between the first supporting capacitor and the second supporting capacitor, and the other end of which is connected to the fifth switching device and the sixth switching device.

10. The flying capacitor clamping circuit according to claim 8, characterized in that, Both the fifth and sixth switching devices are MOS transistors with parasitic diodes. The source of the fifth switching device and the drain of the sixth switching device are connected to the common terminal between the first and second supporting capacitors. The drain of the fifth switching device and the source of the sixth switching device are respectively connected to the two ends of the flying capacitor.

11. The flying capacitor clamping circuit according to claim 8, characterized in that, Both the fifth and sixth switching devices are switching relays.

12. A power supply device, characterized in that, Includes the flying capacitor clamping circuit as described in any one of claims 8 to 11.

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