Starting control method and device of DC / DC converter, equipment and medium
By controlling the steady-state duty cycle and operating frequency during the startup phase of the DC/DC converter, the primary-side converter is started first, which solves the problems of device damage and transformer magnetization during startup and improves the reliability and safety of the circuit.
Patent Information
- Application Number
- CN202511162203.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-19
- Publication Date
- 2025-12-05
AI Technical Summary
In electric vehicles, the startup phase of the DC/DC converter may cause interference such as inrush current and inrush voltage, leading to device damage and transformer magnetic saturation, affecting reliability and driving safety. Existing technologies are difficult to effectively prevent backflow current and transformer bias.
By controlling the timing of the software to determine the steady-state duty cycle and operating frequency at startup, the primary-side converter is started first, the filter inductor current is increased, the reverse current is reduced, and the operating frequency is increased at startup to reduce the magnetic flux density of the first pulse width and avoid transformer magnetization.
It reduces the impact of reverse current, protects switching devices and control chips, reduces losses, avoids transformer magnetic saturation, and improves the reliability and safety of DC/DC converters.
Smart Images
Figure CN121077221A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of DC / DC (Direct Current / Direct Current) converter, and particularly relates to a start-up control method and device of DC / DC converter, equipment and medium. BACKGROUND
[0002] At present, a vehicle-mounted DC / DC converter is generally arranged in an electric vehicle, and the DC / DC converter can convert energy on a high-voltage battery into energy on a low-voltage battery, for example, 12V, to supply power to loads in the new energy vehicle.
[0003] Under normal circumstances, the vehicle-mounted DC / DC converter needs to go through a forward start-up phase from a non-working state to a state of working to convert high voltage (such as 400V) on the high-voltage battery into low voltage (such as 12V) on the low-voltage battery, and can enter a normal working phase after a safe and reliable forward start-up phase. In the normal working phase, a controller receives a sampling signal from the vehicle-mounted DC / DC converter, outputs a driving signal of a switch tube in the vehicle-mounted DC / DC converter according to the sampling signal, and realizes step-down of high voltage on the high-voltage battery to expected low voltage to charge the low-voltage battery. Generally, the side where the high-voltage battery is located is referred to as a high-voltage side, and the side where the low-voltage battery is located is referred to as a low-voltage side.
[0004] However, the forward start-up phase may cause interference such as impulse current and impulse voltage, and may also cause some devices to not work normally, such as switch tube loss, driving chip damage, or transformer magnetic saturation, thereby affecting the reliability of the vehicle-mounted DC / DC converter. The forward start-up phase may also introduce a reverse flow current from the low-voltage battery to the vehicle-mounted DC / DC converter, and the reverse flow current is generally large, thereby affecting the driving safety of the whole vehicle, and therefore a technology of preventing reverse flow or reducing the reverse flow current is needed in the start-up phase.
[0005] In addition, for the transformer conversion circuit of the prior art, the primary side bridge circuit sets a first pulse width (Duty1 / f0) according to a normal working switch frequency f0 and a duty ratio Duty1 required for preventing reverse flow, and this may cause the primary side voltage to be superimposed on both ends of the transformer, which may exceed the saturation magnetic flux density Bmax of the transformer, cause the transformer to be magnetized, and thus cause certain safety hazards. SUMMARY
[0006] Therefore, the application aims to provide a start-up control method, device, equipment and medium of a DC / DC converter, which can reduce the impact of reverse current by a forward start-up protection strategy, protect switching devices and control chips, reduce loss, and reduce the magnetic bias of a main transformer, avoid transformer magnetic saturation, and improve the reliability of the DC / DC converter.
[0007] In the first aspect, the application provides a start-up control method of a DC / DC converter, which comprises the following steps: determining a steady-state duty cycle based on a high-voltage side voltage and a low-voltage side voltage of the DC / DC converter at a start-up time through a control software timing; controlling a primary side priority start of the DC / DC converter based on the steady-state duty cycle to increase an initial forward current flowing through a filter inductor of the DC / DC converter and reduce a reverse current formed by the low-voltage side of the DC / DC converter at the start-up time; and increasing a working frequency of the DC / DC converter at the start-up time through the control software timing to reduce a first pulse width of the DC / DC converter at the start-up time and a magnetic density corresponding to the first pulse width.
[0008] In an optional embodiment of the application, the DC / DC converter comprises a primary side converter, a bridge hard switching circuit, a voltage conversion circuit, a low-voltage side synchronous rectification circuit and a clamping absorption circuit; the primary side converter comprises a capacitor C in2 , a first bridge arm and a second bridge arm, the first bridge arm comprises MOS tube Q H1 and MOS tube Q L1 , the second bridge arm comprises MOS tube Q H2 and MOS tube Q L2 ; the bridge hard switching circuit comprises MOS tube Q H1 , MOS tube Q H2 , MOS tube Q L1 and MOS tube Q L2 ; the voltage conversion circuit comprises a DC blocking capacitor C1, a leakage inductance LIK and a transformer; the low-voltage side synchronous rectification circuit comprises MOS tube SR A , MOS tube SR B , filter inductor L buck and filter capacitor C out ; and the clamping absorption circuit comprises MOS tube AC A , MOS tube AC B and capacitor AC lamp .
[0009] In an optional embodiment of the application, the step of controlling the primary side priority start of the DC / DC converter based on the steady-state duty cycle comprises the following steps: controlling MOS tube Q L1 , MOS tube Q H2 and MOS tube AC B to start at the first beat at the start-up time based on the steady-state duty cycle.; the second beat of the starting time of the MOS tube Q is started based on the steady-state duty ratio control H1 , the MOS tube Q L2 , and the MOS tube AC A .
[0010] In an optional embodiment of the present application, the method further comprises: determining the minimum frequency at which the main transformer of the DC / DC converter is not saturated based on the maximum magnetic flux density that the main transformer of the DC / DC converter can withstand; and determining that the first beat frequency at the starting time is higher than the minimum frequency at which the main transformer of the DC / DC converter is not saturated.
[0011] In an optional embodiment of the present application, the step of increasing the operating frequency of the DC / DC converter at the starting time by controlling the software timing comprises: determining the first operating frequency of the active clamp driving MOS tube AC A and the MOS tube AC B at the starting time by controlling the software timing; and wherein the first operating frequency is greater than the preset steady-state operating frequency.
[0012] In an optional embodiment of the present application, the method further comprises: reducing the operating frequency of the DC / DC converter to the steady-state operating frequency after a preset time length at the starting time.
[0013] In an optional embodiment of the present application, the speed of reducing the operating frequency is lower than the speed of adjusting the magnetic flux density by the DC blocking capacitor C1.
[0014] In a second aspect, the embodiments of the present application further provide a starting control device of a DC / DC converter, the device comprising: a primary side priority starting module configured to determine a steady-state duty ratio at a starting time of the DC / DC converter based on a high-voltage side voltage and a low-voltage side voltage of the DC / DC converter by controlling software timing; and control the primary side priority starting of the DC / DC converter based on the steady-state duty ratio to increase an initial forward current flowing through a filter inductor of the DC / DC converter and reduce a reverse current formed at the low-voltage side of the DC / DC converter at the starting time; and an operating frequency increasing module configured to increase the operating frequency of the DC / DC converter at the starting time by controlling the software timing to reduce a first beat pulse width of the DC / DC converter at the starting time and a magnetic flux density corresponding to the first beat pulse width.
[0015] In a third aspect, the embodiments of the present application further provide an electronic device comprising a processor and a memory, the memory storing computer executable instructions capable of being executed by the processor, and the processor executes the computer executable instructions to implement the starting control method of the DC / DC converter described above.
[0016] In a fourth aspect, the embodiments of the present application further provide a computer readable storage medium, which stores computer executable instructions, and the computer executable instructions, when invoked and executed by a processor, cause the processor to implement the start-up control method of the DC / DC converter.
[0017] The embodiments of the present application bring the following beneficial effects: The embodiments of the present application provide a start-up control method, device, equipment and medium of a DC / DC converter, which can reduce the impact of backflow current through a forward start-up protection strategy, and can protect switching devices, control chips, reduce loss and the like, and can also reduce the magnetic bias of a main transformer, avoid transformer magnetic saturation, and improve the reliability of the DC / DC converter.
[0018] Other features and advantages of the present disclosure will be described in the following description, or can be inferred from the description, or can be determined without doubt, or can be known by implementing the above-mentioned technologies of the present disclosure.
[0019] In order to make the above-mentioned purposes, features and advantages of the present disclosure more obvious and easy to understand, the following preferred embodiments are specifically described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.
[0021] Figure 1 A flow chart of a start-up control method of a DC / DC converter provided by the embodiments of the present application is shown in the figure; Figure 2 A circuit structure schematic diagram of a DC / DC converter provided by the embodiments of the present application is shown in the figure; Figure 3 A start-up driving timing diagram of a DC / DC converter provided by the embodiments of the present application is shown in the figure; Figure 4 A structure schematic diagram of a start-up control device of a DC / DC converter provided by the embodiments of the present application is shown in the figure; Figure 5 A structure schematic diagram of an electronic device provided by the embodiments of the present application is shown in the figure. DETAILED DESCRIPTION
[0022] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.
[0023] Currently, a vehicle-mounted DC / DC converter is generally arranged in an electric vehicle, which can convert the energy on a high-voltage battery into the energy on a low-voltage battery, for example, 12V, to supply power to the load in the new energy vehicle.
[0024] However, the interference such as impact current and impact voltage may be caused in the forward starting stage, and some devices may not work normally, such as switch tube loss, drive chip damage, or transformer magnetic saturation, which affects the reliability of the vehicle-mounted DC / DC converter. The reverse flow current from the low-voltage battery to the vehicle-mounted DC / DC converter may be introduced in the forward starting stage, and the reverse flow current is generally large, thereby affecting the driving safety of the whole vehicle, so the technology of preventing reverse flow or reducing the reverse flow current is needed in the starting stage.
[0025] In addition, for the transformer conversion circuit of the prior art, the first pulse width (Duty1 / f0) is set according to the normal working switch frequency f0 and the duty ratio Duty1 required for preventing reverse flow of the primary side bridge circuit, which may cause the primary side voltage to be superimposed on both ends of the transformer due to the excessive first pulse width, which is easy to exceed the saturation magnetic flux density Bmax of the transformer, causing the magnetic bias of the transformer, thereby causing certain safety hazards.
[0026] Based on this, the embodiments of the present application provide a starting control method, device, equipment and medium of a DC / DC converter, specifically provide a starting reverse flow prevention and magnetic bias strategy of a DC / DC converter, which can reduce the impact of the reverse flow current through the forward starting protection strategy, and has the effects of protecting the switching device, the control chip, reducing the loss, etc.; can also reduce the magnetic bias of the main transformer, avoid the magnetic saturation of the transformer, and improve the reliability of the DC / DC converter.
[0027] In order to facilitate the understanding of the embodiments, first, a starting control method of a DC / DC converter disclosed by the embodiments of the present application will be introduced in detail.
[0028] Embodiment one: The embodiments of the present application provide a starting control method of a DC / DC converter, referring to the flow chart of the starting control method of a DC / DC converter shown in Figure 1 The starting control method of the DC / DC converter includes the following steps: In step S102, the steady-state duty ratio is determined based on the high-voltage side voltage and the low-voltage side voltage of the DC / DC converter at the starting time through the control software timing; the primary side priority start of the DC / DC converter is controlled based on the steady-state duty ratio, so as to increase the initial forward current flowing through the filter inductor of the DC / DC converter and reduce the reverse current formed at the low-voltage side of the DC / DC converter at the starting time.
[0029] In the embodiment, the steady-state duty ratio can be determined according to the high-voltage side voltage and the low-voltage side voltage of the DC / DC converter during the starting process through the control software timing, while ensuring that the primary side is started first, so as to increase the initial forward current flowing through the filter inductor L buck , and further optimize the size of the reverse current and improve the reliability of the DC / DC converter.
[0030] Referring to a circuit structure schematic diagram of a DC / DC converter shown in Figure 2 , as shown in Figure 2 , the DC / DC converter comprises a primary side converter, a bridge hard switching circuit, a voltage conversion circuit, a low-voltage side synchronous rectification circuit and a clamping absorption circuit. The primary side converter comprises a capacitor C in2 , a first bridge arm and a second bridge arm, the first bridge arm comprises MOS tubes Q H1 and Q L1 , and the second bridge arm comprises MOS tubes Q H2 and Q L2 ; the bridge hard switching circuit comprises MOS tubes Q H1 , Q H2 , Q L1 and Q L2 ; the voltage conversion circuit comprises a DC blocking capacitor C1, a leakage inductance LIK and a transformer; the low-voltage side synchronous rectification circuit comprises MOS tubes SR A , SR B , a filter inductor L buck and a filter capacitor C out ; and the clamping absorption circuit comprises MOS tubes AC A , AC B and a capacitor AC lamp .
[0031] The primary side converter in the embodiment can comprise a capacitor C in2 , a first bridge arm (MOS tubes Q H1 and Q L1 ) and a second bridge arm (MOS tubes Q H2 and Q L2 ); and the bridge hard switching circuit can comprise four MOS tubes Q H1 , Q H2, Q L1 and Q L2 ; the voltage conversion circuit can comprise a DC blocking capacitor C1, a leakage inductance LIK and a transformer; the low-voltage side synchronous rectification circuit can comprise a low-voltage MOS transistor SR A , a low-voltage MOS transistor SR B , a filter inductor L buck and a filter capacitor C out ; the clamping and absorption circuit can comprise a MOS transistor AC A , a MOS transistor AC B and a capacitor AC lamp .
[0032] For the bidirectional DC / DC converter shown in Figure 2 , the embodiment can first calculate the steady-state duty ratio Duty1 through the high-voltage side DC link voltage Vin and the low-voltage side voltage Vout, and then refer to the steady-state duty ratio Duty1 to first open the primary side to ensure that the inductor L buck is raised to the forward inductor current, thereby reducing the reverse current formed on the low-voltage side as much as possible at the start-up moment.
[0033] In step S104, the working frequency of the DC / DC converter is increased at the start-up moment through the control software timing to reduce the first pulse width of the DC / DC converter at the start-up moment and the magnetic flux density corresponding to the first pulse width.
[0034] In the embodiment, the working frequency of the DC / DC converter can also be increased at the start-up moment through the software control timing, so that the first pulse width of the DC / DC converter at the start-up moment and the magnetic flux density corresponding to the first pulse width, thereby improving the safety of the circuit.
[0035] As shown in Figure 2 , the embodiment can also increase the working frequency f1 of the DC / DC converter at the start-up moment through the control software start-up timing (wherein the start-up working switch frequency f1> normal working switch frequency f0), reduce the first pulse width (Duty1 / f1) at the start-up moment and the magnetic flux density Bf1 corresponding to the first pulse width, set the start-up working switch frequency f1, ensure that the first pulse magnetic flux density Bf1<< Bmax, thereby improving the safety of the circuit.
[0036] The embodiment of the application provides a start-up control method of a DC / DC converter, which can reduce the impact of the reverse current through the forward start-up protection strategy, plays a role in protecting the switching device, the control chip and reducing the loss, and can also reduce the magnetic bias of the main transformer, avoids the magnetic saturation of the transformer, and improves the reliability of the DC / DC converter.
[0037] Embodiment two: This embodiment provides another start-up control method for DC / DC converters, which is implemented based on the above embodiment. The focus is on describing the specific implementation of the start-up anti-backflow and bias magnetization strategy of the DC / DC converter.
[0038] In some embodiments, the MOSFET Q can be started in the first step of the power-on process based on the steady-state duty cycle control. L1 MOSFET Q H2 and MOSFET AC B The second-phase start-up of the MOSFET Q is based on steady-state duty cycle control. H1 MOSFET Q L2 and MOSFET AC A .
[0039] See Figure 3 The diagram shown is a startup driving timing diagram of a DC-DC converter. In this embodiment, the first step is to drive the primary side and the AC side (used to drive the AC MOSFET). A and AC B The second tapping SR driver, along with another primary-side driver and SR driver (used to drive the MOSFET SR), A and SR B ).
[0040] like Figure 3 As shown, during the time interval t0-t1, the MOSFET Q... L1 MOSFET Q H2 and MOSFET AC B First, turn on the MOSFET Q. H1 MOSFET Q L2 and MOSFET AC A After opening, energy is output from the primary side to the secondary side, establishing a positive inductance current and a negative magnetic flux density.
[0041] In some embodiments, the minimum frequency at which the main transformer of the DC / DC converter is not biased can be determined based on the maximum magnetic flux density that the main transformer of the DC / DC converter can withstand; and the first beat frequency at the start-up time can be determined to be higher than the minimum frequency at which the main transformer of the DC / DC converter is not biased.
[0042] This embodiment can also set the start-up frequency: the initial duty cycle is calculated based on the input and output voltages, and the maximum magnetic flux density B that the main transformer can withstand is determined according to the worst operating conditions (maximum voltage of the small battery). tlmax Calculate the lowest frequency f at which the main transformer is not biased. Low Ensure the first clock cycle frequency f during startup start Higher than f Low .
[0043] In some embodiments, the active clamping drive MOSFET AC can be determined at startup time by controlling the software timing.A and MOS tube AC B The first working frequency; wherein the first working frequency is greater than the preset steady-state working frequency.
[0044] As Figure 2 shown, the embodiment can set the switching frequency of the primary bridge circuit driving MOS tube Q H1 , MOS tube Q L1 , MOS tube Q H2 , MOS tube Q L2 , secondary rectifier circuit driving MOS tube SR A , MOS tube SR B , active embedding driving MOS tube AC A , MOS tube AC B to the first working frequency f1 (the first working frequency f1>steady-state working frequency f0) at the initial start time, reduce the first pulse primary side pulse width, reduce the magnetic density, improve the safety of the circuit, without changing the initial duty cycle, by opening the primary side first to ensure that the filter inductor L buck Lift the forward inductor current, and try to reduce the reverse current formed at the low-voltage side at the start time.
[0045] In some embodiments, the working frequency of the DC / DC converter can also be reduced to the steady-state working frequency after a preset time at the start time. Wherein the speed of reducing the working frequency is lower than the speed of regulating the magnetic density of the DC / DC converter.
[0046] As Figure 3 shown, at t1-t2, the frequency is soft. At the subsequent time of the start time, the working frequency of the converter can be gradually reduced from f1 to the steady-state working frequency f0 by adjusting the working frequency of the DC / DC converter, and the speed of reducing is lower than the speed of regulating the magnetic density of the DC / DC converter.
[0047] In summary, as Figure 2 and Figure 3 , at t0-t1, MOS tube Q L1 , MOS tube Q H2 and MOS tube AC B open first, the primary side outputs energy to the secondary side, establishes the forward inductor current, reduces the size of the low-voltage side current reverse at the low-voltage side, and at the same time, reduces the first pulse primary side driving pulse width, reduces the magnetic density of the transformer, so that the magnetic density at the start time is lower than the saturation magnetic density Bmax of the transformer, thereby improving the safety of the circuit. At t1-t2, the working frequency of the converter is gradually reduced to the steady-state working frequency, and at this stage, the magnetic density of the transformer is gradually adjusted by the DC blocking capacitor to ensure the normal operation of the circuit.
[0048] The method provided in this embodiment of the invention, through a positive start-up protection strategy, can reduce the impact of reverse current, thereby protecting switching devices and control chips, reducing losses, etc.; it can also reduce the bias magnetism of the main transformer, avoid transformer magnetic saturation, and improve the reliability of the DC / DC converter.
[0049] Example 3: Corresponding to the above method embodiments, this invention provides a start-up control device for a DC / DC converter, see [link to relevant documentation]. Figure 4 The diagram shows a schematic of a start-up control device for a DC / DC converter. The start-up control device includes: The primary-side priority startup module 41 is used to determine the steady-state duty cycle based on the high-voltage side voltage and low-voltage side voltage of the DC / DC converter at startup time by controlling the timing of the software; based on the steady-state duty cycle, the primary side of the DC / DC converter is prioritized for startup, so as to increase the initial forward current flowing through the filter inductor of the DC / DC converter and reduce the reverse current formed on the low-voltage side of the DC / DC converter at startup time. The operating frequency enhancement module 42 is used to increase the operating frequency of the DC / DC converter at startup by controlling the timing of the software, so as to reduce the first pulse width and the magnetic flux density corresponding to the first pulse width of the DC / DC converter at startup.
[0050] This invention provides a start-up control device for a DC / DC converter. Through a positive start-up protection strategy, it can reduce the impact of reverse current, thereby protecting switching devices and control chips, reducing losses, etc. It can also reduce the bias magnetism of the main transformer, avoid transformer magnetic saturation, and improve the reliability of the DC / DC converter.
[0051] The aforementioned DC / DC converter includes: a primary-side converter, a bridge hard-switching circuit, a transformer-to-conversion circuit, a low-voltage side synchronous rectification circuit, and a clamping snubber circuit; the primary-side converter includes: capacitor C in2 First bridge arm, second bridge arm. The first bridge arm includes: MOSFET Q. H1 and MOSFET Q L1 The second bridge arm includes: MOSFET Q H2 and MOSFET Q L2 The bridge hard-switching circuit includes: MOSFET Q H1 MOSFET Q H2 MOSFET Q L1 and MOSFET Q L2 The transformer conversion circuit includes: DC blocking capacitor C1, leakage inductance LIK, and transformer; the low-voltage side synchronous rectification circuit includes: MOSFET SR. A MOSFET SR B Filter inductor L buck and filter capacitor Cout ; the clamping absorption circuit comprises MOS tube AC A , MOS tube AC B and capacitor AC lamp .
[0052] The primary side priority starting module is used for starting MOS tube Q L1 , MOS tube Q H2 and MOS tube AC B based on the first beat of the starting time of the steady-state duty cycle control. H1 , MOS tube Q L2 and MOS tube AC A based on the second beat of the starting time of the steady-state duty cycle control.
[0053] The device comprises a minimum frequency determination module, which is used for determining the minimum frequency of the main transformer of the DC / DC converter not to be magnetized based on the maximum bearing magnetic density of the main transformer of the DC / DC converter.
[0054] The working frequency improvement module is used for determining the first working frequency of active embedding drive MOS tube AC A and MOS tube AC B at the starting time through the control of software timing; wherein the first working frequency is greater than the preset steady-state working frequency.
[0055] The device comprises a working frequency reduction module, which is used for reducing the working frequency of the DC / DC converter to the steady-state working frequency after a preset time length at the starting time.
[0056] The speed of the working frequency reduction is lower than the speed of the regulation of the magnetic density of the direct-current blocking capacitor C1.
[0057] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the starting control device of the DC / DC converter described above can refer to the corresponding process in the foregoing embodiment of the starting control method of the DC / DC converter, which will not be repeated here.
[0058] Embodiment four: The embodiment of the application further provides an electronic device for running the starting control method of the DC / DC converter; referring to Figure 5 , a structural schematic diagram of an electronic device is shown, which comprises a memory 100 and a processor 101, wherein the memory 100 is used for storing one or more computer instructions, and the one or more computer instructions are executed by the processor 101 to realize the starting control method of the DC / DC converter.
[0059] Further, Figure 5 The electronic device shown further includes a bus 102 and a communication interface 103, and the processor 101, the communication interface 103 and the memory 100 are connected through the bus 102.
[0060] The memory 100 can include a high-speed random access memory (RAM), and can also include a non-volatile memory, such as at least one disk memory. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 103 (which can be wired or wireless), and the Internet, a wide area network, a local area network, a metropolitan area network, etc. can be used. The bus 102 can be an ISA bus, a PCI bus, or an EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5 Only one bidirectional arrow is used in the figure, but it does not mean that there is only one bus or one type of bus.
[0061] The processor 101 can be an integrated circuit chip with signal processing capability. In the implementation process, each step of the above method can be completed by integrated logic circuits of hardware in the processor 101 or instructions in the form of software. The above processor 101 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. Each method, step and logic block disclosed in the embodiment of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in combination with the embodiment of the present application can be directly embodied as a hardware code processor for execution, or a combination of hardware and software modules in the code processor for execution. The software module can be located in a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, a register, etc. The storage medium in the art. The storage medium is located in the memory 100, and the processor 101 reads the information in the memory 100, and combines the hardware to complete the steps of the method of the above embodiment.
[0062] The embodiment of the present application further provides a computer readable storage medium, which stores computer executable instructions, and the computer executable instructions, when called and executed by a processor, cause the processor to implement the start-up control method of the DC / DC converter.
[0063] The DC / DC converter start-up control method, device, equipment and medium computer program product provided by the embodiment of the present application include a computer readable storage medium storing program codes, and the instructions included in the program codes can be used to execute the method in the foregoing method embodiment, and the specific implementation can be referred to the method embodiment, and details are not described herein.
[0064] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and / or device described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein.
[0065] In addition, in the description of the embodiment of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0066] The functions, if realized in the form of software function units and sold or used as independent products, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application or the part of the technical solutions which essentially contribute to the prior art or the part of the technical solutions can be embodied in the form of software products. The computer software product is stored in a storage medium, includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various program code storage media.
[0067] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0068] Finally, it should be noted that the above-described embodiments are only specific implementations of the present application, which are used to illustrate the technical solutions of the present application, and are not limiting. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily think of changes to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some technical features, within the technical scope disclosed by the present application. Such modifications, changes or replacements do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A method of starting control of a DC / DC converter, characterized by, The method comprises: determining a steady-state duty ratio based on a high-voltage side voltage and a low-voltage side voltage of the DC / DC converter at a start-up time through control software timing; and controlling a primary-side first start of the DC / DC converter based on the steady-state duty ratio to increase an initial forward current flowing through a filter inductance of the DC / DC converter and reduce a reverse current formed at the low-voltage side of the DC / DC converter at the start-up time; increasing a working frequency of the DC / DC converter at the start-up time through control software timing to reduce a first pulse width of the DC / DC converter at the start-up time and a magnetic flux density corresponding to the first pulse width.
2. The method of claim 1, wherein, The DC / DC converter comprises a primary-side converter, a bridge hard-switching circuit, a voltage conversion circuit, a low-voltage side synchronous rectification circuit, and a clamping absorption circuit. The primary side converter comprises a capacitor C in2 , a first bridge arm, the first bridge arm comprising MOS transistor Q H1 and MOS transistor Q L1 , and a second bridge arm, the second bridge arm comprising MOS transistor Q H2 and MOS transistor Q L2 ; The bridge hard-switching circuit comprises the MOS tube Q H1 , the MOS tube Q H2 , the MOS tube Q L1 , and the MOS tube Q L2 ; The voltage conversion circuit comprises a DC blocking capacitor C1, a leakage inductance LIK, and a transformer. The low-voltage side synchronous rectification circuit comprises a MOS transistor SR A , a MOS transistor SR B , a filter inductor L buck , and a filter capacitor C out ; The clamping absorption circuit comprises a MOS tube AC A , a MOS tube AC B and a capacitor AC lamp .
3. The method of claim 2, wherein, The step of controlling the primary-side first start of the DC / DC converter based on the steady-state duty ratio comprises: The MOS tube Q is started at the first beat of the starting moment of the steady-state duty cycle control L1 The MOS tube Q H2 and the MOS tube AC B ; The MOS tube Q is started at the second beat of the starting moment of the steady state duty cycle control H1 The MOS tube Q L2 And the MOS tube AC A .
4. The method of claim 3, wherein, The method further comprises: determining a minimum frequency at which a main transformer of the DC / DC converter is not magnetically biased based on a maximum bearing magnetic flux density of the main transformer of the DC / DC converter; determining that a first pulse frequency at the start-up time is higher than the minimum frequency at which the main transformer of the DC / DC converter is not magnetically biased.
5. The method of claim 2, wherein, The step of increasing the working frequency of the DC / DC converter at the start-up time through control software timing comprises: Determine the active embedded position drive the MOS tube AC by controlling software timing at the start time A And the first working frequency of the MOS tube AC B ; wherein, the first working frequency is greater than the preset steady state working frequency.
6. The method of claim 5, wherein, The method further comprises: reducing the working frequency of the DC / DC converter to the steady-state working frequency after a preset time length at the start-up time.
7. The method of claim 6, wherein, A speed of the working frequency reduction is lower than a speed of the DC blocking capacitor C1 adjusting the magnetic flux density.
8. A start-up control device for a DC / DC converter, characterized in that, The apparatus comprises: a primary-side first start module configured to determine a steady-state duty ratio based on a high-voltage side voltage and a low-voltage side voltage of the DC / DC converter at a start-up time through control software timing; and control a primary-side first start of the DC / DC converter based on the steady-state duty ratio to increase an initial forward current flowing through a filter inductance of the DC / DC converter and reduce a reverse current formed at the low-voltage side of the DC / DC converter at the start-up time; a working frequency increasing module configured to increase a working frequency of the DC / DC converter at the start-up time through control software timing to reduce a first pulse width of the DC / DC converter at the start-up time and a magnetic flux density corresponding to the first pulse width.
9. An electronic device, comprising: The apparatus comprises a processor and a memory, the memory stores computer executable instructions capable of being executed by the processor, and the processor executes the computer executable instructions to implement the start-up control method of the DC / DC converter.
10. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer executable instructions, and the computer executable instructions, when invoked and executed by a processor, cause the processor to implement the start-up control method of the DC / DC converter.