CN117674562B - Control method and device of phase-shifting full-bridge converter, converter and control system - Google Patents
Control method and device of phase-shifting full-bridge converter, converter and control system Download PDFInfo
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- CN117674562B CN117674562B CN202211060799.4A CN202211060799A CN117674562B CN 117674562 B CN117674562 B CN 117674562B CN 202211060799 A CN202211060799 A CN 202211060799A CN 117674562 B CN117674562 B CN 117674562B
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- 238000010586 diagram Methods 0.000 description 9
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33573—Full-bridge at primary side of an isolation transformer
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Abstract
The disclosure relates to a control method, a device, a converter and a control system of a phase-shifting full-bridge converter, and relates to the technical field of power electronics, wherein the method comprises the following steps: and determining target duty ratios corresponding to the plurality of second control switches according to the output voltage of the low-voltage module and the output current of the low-voltage module, controlling the plurality of second control switches according to the target duty ratios, and controlling the plurality of first control switches according to the designated duty ratios so that the phase-shifting full-bridge converter outputs the target voltage, wherein the target duty ratios are larger than the designated duty ratios. The second control switch can be controlled according to the target duty ratio determined by the output voltage and the output current of the low-voltage side, the duty ratio of the low-voltage side can be dynamically adjusted, the phase-shifting full-bridge converter can be suitable for more application scenes, the practicability and expansibility of the phase-shifting full-bridge converter are improved, the current stress of the low-voltage side can be reduced, the heating value of the second control switch of the low-voltage side is reduced, and the safety of the phase-shifting full-bridge converter is improved.
Description
Technical Field
The present disclosure relates to the field of power electronics, and in particular, to a method and apparatus for controlling a phase-shifting full-bridge converter, a converter, and a control system
Background
With the continuous development of new energy power generation, electric vehicles and other distributed energy systems, the phase-shifting full-bridge converter has been widely applied to various high-power occasions as a practical topology due to the characteristics of good electrical isolation, high power density and the like. At present, the control switch at the low-voltage side of the phase-shifting full-bridge converter and the control switch at the high-voltage side of the phase-shifting full-bridge converter are respectively controlled according to a duty ratio of 50%, so that the phase-shifting full-bridge converter outputs corresponding voltages. However, by adopting the control mode, the current stress of the low-voltage side of the phase-shifting full-bridge converter is larger, and the heating value of the control switch of the low-voltage side is larger, so that the phase-shifting full-bridge converter can only meet the application scenes of small voltage input and small voltage and small current output, and the practicability and expansibility of the phase-shifting full-bridge converter are affected.
Disclosure of Invention
In order to solve the problems in the related art, the present disclosure provides a control method, apparatus, converter and control system of a phase-shifting full-bridge converter.
In order to achieve the above object, according to a first aspect of embodiments of the present disclosure, there is provided a control method of a phase-shifted full-bridge converter including a high-voltage module, a low-voltage module, and a transformer; the high-voltage module is connected with the low-voltage module through the transformer; the high voltage module includes a plurality of first control switches, and the low voltage module includes a plurality of second control switches; the method comprises the following steps:
obtaining the output voltage of the low-voltage module and the output current of the low-voltage module;
Determining target duty ratios corresponding to the plurality of second control switches according to the output voltage and the output current;
The plurality of second control switches are controlled according to the target duty ratio, and the plurality of first control switches are controlled according to the designated duty ratio so that the phase-shifting full-bridge converter outputs target voltage;
wherein the target duty cycle is greater than the specified duty cycle.
Optionally, the determining, according to the output voltage and the output current, a target duty ratio corresponding to the plurality of second control switches includes:
determining the duty ratios to be selected corresponding to the second control switches according to the output voltage and the output current;
And determining the target duty ratio according to the duty ratio to be selected and the current peak value of the low-voltage side of the transformer.
Optionally, the determining the duty ratios to be selected corresponding to the plurality of second control switches according to the output voltage and the output current includes:
Determining the duty ratio to be selected according to the output voltage and the output current and based on a preset relation; the preset relation is to determine a target current parameter according to the output current and the first parameter, determine a target voltage parameter according to the output voltage and the second parameter, and determine the duty ratio to be selected according to the ratio of the target current parameter to the target voltage parameter and the preset parameter.
Optionally, the low-voltage module includes a target capacitor, and the target capacitor is connected with an output end of the low-voltage module; the determining the duty ratios to be selected corresponding to the plurality of second control switches according to the output voltage and the output current includes:
And determining a target capacitance value corresponding to the target capacitance according to the output voltage and the output current, and determining the duty ratio to be selected according to the target capacitance value and a preset parameter.
Optionally, the determining the target duty ratio according to the duty ratio to be selected and a current peak value of the low-voltage side of the transformer includes:
adjusting the preset parameters within a preset threshold range to increase or decrease the duty ratio to be selected, respectively controlling the plurality of second control switches according to the plurality of adjusted duty ratios to be selected, and acquiring the current peak value corresponding to each adjusted duty ratio to be selected;
And taking the adjusted duty ratio to be selected corresponding to the smallest current peak value as the target duty ratio in the current peak value corresponding to the plurality of adjusted duty ratios to be selected.
Optionally, the specified duty cycle is 50%.
According to a second aspect of embodiments of the present disclosure, there is provided a control device of a phase-shifted full-bridge converter, the device comprising:
A memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method of any of the first aspects.
According to a third aspect of embodiments of the present disclosure, there is provided a phase-shifted full-bridge converter, the phase-shifted full-bridge converter including a high-voltage module, a low-voltage module, a transformer, and the control device of the second aspect; the high-voltage module is connected with the low-voltage module through the transformer; the high voltage module includes a plurality of first control switches, and the low voltage module includes a plurality of second control switches; the control device is respectively connected with the high-voltage module and the low-voltage module.
Optionally, the high-voltage module comprises a first control switch, a second control switch, a third control switch, a fourth control switch, a first capacitor, a second capacitor and a first inductor; the first end of the first control switch is respectively connected with the first end of the third control switch and the first end of the first capacitor, and the second end of the second control switch is respectively connected with the second end of the fourth control switch and the second end of the first capacitor; the second end of the first control switch is respectively connected with the first end of the second control switch and the first end of the second capacitor, and the second end of the second capacitor is connected with the first end of the first inductor; the second end of the first inductor is connected with the first end of the low-voltage side of the transformer, and the second end of the third control switch is respectively connected with the first end of the fourth control switch and the second end of the low-voltage side of the transformer; a first end of the first control switch and a second end of the second control switch are used as input ends of the high-voltage module;
The low-voltage module comprises a fifth control switch, a sixth control switch, a seventh control switch, an eighth control switch, a target capacitor and a second inductor; the first end of the fifth control switch is respectively connected with the first end of the seventh control switch, the first end of the target capacitor and the first end of the second inductor, and the second end of the sixth control switch is respectively connected with the second end of the eighth control switch and the second end of the target capacitor; the second end of the fifth control switch is respectively connected with the first end of the sixth control switch and the first end of the high-voltage side of the transformer, and the second end of the seventh control switch is respectively connected with the first end of the eighth control switch and the second end of the high-voltage side of the transformer; the second end of the second inductor and the second end of the eighth control switch are used as output ends of the low-voltage module.
According to a fourth aspect of embodiments of the present disclosure, there is provided a control system of a phase-shifted full-bridge inverter, the control system comprising a phase-shifted full-bridge inverter and a control device according to the second aspect; the phase-shifting full-bridge converter is connected with the control device. Comprising the following steps:
through the technical scheme, the output voltage of the low-voltage module and the output current of the low-voltage module are obtained first, then the target duty ratios corresponding to the second control switches are determined according to the output voltage and the output current, the second control switches are controlled according to the target duty ratios, and the first control switches are controlled according to the designated duty ratios, so that the phase-shifting full-bridge converter outputs the target voltage. According to the method and the device, the target duty ratio higher than the specified duty ratio of the high-voltage side can be determined through the output voltage and the output current of the low-voltage side, and the second control switch is controlled according to the target duty ratio, so that the duty ratio of the low-voltage side can be dynamically adjusted while the carrying capacity of the phase-shifting full-bridge converter is ensured, the phase-shifting full-bridge converter can be suitable for more application scenes, the practicability and the expansibility of the phase-shifting full-bridge converter are improved, and the current stress of the low-voltage side can be reduced, the heating value of the second control switch of the low-voltage side is reduced, and the safety of the phase-shifting full-bridge converter is improved by limiting the target duty ratio to be smaller than the specified duty ratio.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a flow chart illustrating a method of controlling a phase-shifted full-bridge inverter according to an exemplary embodiment;
FIG. 2 is a schematic diagram illustrating a phase-shifted full-bridge inverter in series in a loop application, according to an exemplary embodiment;
FIG. 3 is a flow chart illustrating one step 102 according to the embodiment shown in FIG. 1;
Fig. 4 is a block diagram illustrating a control apparatus of a phase-shifted full-bridge inverter according to an exemplary embodiment.
FIG. 5 is a block diagram of a phase-shifted full-bridge converter, according to an exemplary embodiment;
FIG. 6 is a schematic diagram illustrating a control device for a phase-shifted full-bridge inverter according to an exemplary embodiment;
Fig. 7 is a block diagram illustrating a control system of a phase-shifted full-bridge inverter according to an exemplary embodiment.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
Fig. 1 is a flowchart illustrating a method of controlling a phase-shifted full-bridge inverter according to an exemplary embodiment. As shown in fig. 1, the phase-shifting full-bridge converter includes a high-voltage module, a low-voltage module, and a transformer, the high-voltage module is connected with the low-voltage module through the transformer, the high-voltage module includes a plurality of first control switches, and the low-voltage module includes a plurality of second control switches. The method may comprise the steps of:
Step 101, obtaining an output voltage of the low-voltage module and an output current of the low-voltage module.
Step 102, determining target duty ratios corresponding to the second control switches according to the output voltage and the output current.
Step 103, controlling the plurality of second control switches according to the target duty ratio, and controlling the plurality of first control switches according to the designated duty ratio, so that the phase-shifting full-bridge converter outputs the target voltage.
Wherein the target duty cycle is greater than the specified duty cycle.
For example, the current stress of the low-voltage side of the phase-shifting full-bridge converter can be reduced by changing the duty ratio of the control switch of the low-voltage side of the phase-shifting full-bridge converter, and the heating value of the control switch of the low-voltage side can be reduced. In particular, the phase-shifted full-bridge converter may be comprised of a high voltage module, a low voltage module, and a transformer. The high-voltage module is a module formed by devices on the high-voltage side of the phase-shifting full-bridge converter, and can comprise a plurality of first control switches, and the low-voltage module is a module formed by devices on the low-voltage side of the phase-shifting full-bridge converter, and can comprise a plurality of second control switches. The first control switch and the second control switch may be, for example, switching elements such as MOSFET (english: metal-Oxide-Semiconductor Field-Effect Transistor, chinese: metal-Oxide semiconductor field effect transistor), IGBT (english: insulated Gate Bipolar Transistor, chinese: insulated gate bipolar transistor), and the like.
When the phase-shifting full-bridge converter is connected in series in the loop for application, the output voltage of the low-voltage module and the output current of the low-voltage module can be obtained first, and then the duty ratio to be selected (i.e. the duty ratio to be selected is actually a theoretical value) corresponding to all the second control switches of the low-voltage module is calculated when the output parameter index (such as the voltage ripple parameter index and the current ripple parameter index) of the phase-shifting full-bridge converter is theoretically satisfied according to the output voltage and the output current. Then, the phase-shifting full-bridge converter can be debugged by changing the duty ratio to be selected, so that a proper target duty ratio corresponding to a plurality of second control switches which can reduce the current stress of the low-voltage side and the heating value of the second control switches is found. And finally, controlling all the second control switches according to the target duty ratio, and controlling all the first control switches according to the designated duty ratio so as to enable the phase-shifting full-bridge converter to output corresponding target voltage according to the output parameter index. Wherein the specified duty cycle is 50% and the target duty cycle is greater than 50%. When the phase-shifting full-bridge converter is used for realizing the charge and discharge functions of the battery, a schematic diagram of the phase-shifting full-bridge converter connected in series in the circuit application can be shown as fig. 2, wherein hdc+ in fig. 2 is an anode input end of the high-voltage module, HDC-is a cathode input end of the high-voltage module, ldc+ is an anode output end of the low-voltage module, and LDC-is a cathode output end of the low-voltage module.
It should be noted that the control process of steps 101-103 may be performed by a controller, and the controller may be, for example, a processor with a control function, such as an MCU (english: microcontroller Unit, chinese: micro control unit), a PLC (english: programmable Logic Controller, chinese: programmable logic controller), or a CPU (english: central Processing Unit, chinese: central processing unit).
In summary, the present disclosure firstly obtains an output voltage of a low-voltage module and an output current of the low-voltage module, then determines a target duty ratio corresponding to a plurality of second control switches according to the output voltage and the output current, then controls the plurality of second control switches according to the target duty ratio, and controls the plurality of first control switches according to a specified duty ratio, so that the phase-shifting full-bridge converter outputs the target voltage. According to the method and the device, the target duty ratio higher than the specified duty ratio of the high-voltage side can be determined through the output voltage and the output current of the low-voltage side, and the second control switch is controlled according to the target duty ratio, so that the duty ratio of the low-voltage side can be dynamically adjusted while the carrying capacity of the phase-shifting full-bridge converter is ensured, the phase-shifting full-bridge converter can be suitable for more application scenes, the practicability and the expansibility of the phase-shifting full-bridge converter are improved, and the current stress of the low-voltage side can be reduced, the heating value of the second control switch of the low-voltage side is reduced, and the safety of the phase-shifting full-bridge converter is improved by limiting the target duty ratio to be smaller than the specified duty ratio.
Fig. 3 is a flow chart illustrating one step 102 according to the embodiment shown in fig. 1. As shown in fig. 3, step 102 may include the steps of:
Step 1021, determining the duty ratios to be selected corresponding to the plurality of second control switches according to the output voltage and the output current.
Step 1022, determining the target duty cycle according to the duty cycle to be selected and the current peak value of the low-voltage side of the transformer.
For example, the duty ratios to be selected corresponding to all the second control switches can be calculated theoretically when the output parameter index of the phase-shifting full-bridge converter is satisfied according to the output voltage and the output current. In order to further reduce the current stress of the low-voltage side and the heating value of the second control switch, the phase-shifting full-bridge converter can be debugged by changing the duty ratio to be selected and controlling the second control switch according to the changed duty ratio to be selected so as to find the target duty ratio corresponding to the plurality of second control switches when the current stress of the low-voltage side is minimum.
In one implementation, the duty cycle to be selected may be determined from the output voltage and the output current and based on a preset relationship. The preset relation is used for determining a target current parameter according to the output current and the first parameter, determining a target voltage parameter according to the output voltage and the second parameter, and determining a duty ratio to be selected according to the ratio of the target current parameter to the target voltage parameter and the preset parameter. For example, when the preset relationship is a preset formula, the preset formula may be expressed as: d= [ (k1×ic)/(k2×uo) ]/K3. Where Uo is the output voltage, ic is the output current, K1 is the first parameter, K2 is the second parameter, and K3 is the preset parameter, K1, K2, and K3 may be constants determined according to empirical and/or experimental data, for example, K1 may be 40, K2 may be 0.1, and K3 may be 32.
In another implementation, the low voltage module may include a target capacitance that is connected to an output of the low voltage module. The target capacitance value corresponding to the target capacitance is calculated, so that the output parameter index of the phase-shifting full-bridge converter can be met, and meanwhile, the target capacitance has the function of supporting energy output and has great influence on the duty ratio, so that the duty ratio to be selected can be determined by calculating the target capacitance. Therefore, after the output voltage and the output current are obtained, the target capacitance value corresponding to the target capacitance can be determined according to the output voltage and the output current, and the duty ratio to be selected can be determined according to the target capacitance value and the preset parameter. For example, the target capacitance value may be determined from the output voltage and the output current using a capacitance value calculation formula. The capacitance value calculation formula can be expressed as: c= (k4×Δi)/Δv, Δv=k5×uo Δi=k6 Ic, the unit of C is uF. Wherein, C is the target capacitance value, uo is the output voltage, and Ic is the output current. K4 may be the product of the equivalent series resistance of the target capacitor and the capacitor, and is a constant, generally between 50 and 80, and K4 may be selected to ensure the stability of the output voltage and the stability of the current 80. K5 and K6 are a common index parameter designed according to the phase-shifted full-bridge converter output parameter index (e.g., K5 may take 0.1 and K6 may take 0.5). Furthermore, in other embodiments of the present application, there are other implementations of calculating the target capacitance based on the voltage and current, which are conventional techniques for those skilled in the art, so the present disclosure is not limited as to how to obtain the capacitance based on the voltage and current.
Then, the duty cycle to be selected can be determined by using an empirical calculation formula according to the target capacitance value and the preset parameter. Wherein, the empirical calculation formula can be expressed as: d=c/K7, D is the duty cycle to be selected, C is the target capacitance value, and K7 is a preset parameter. Taking 1200V as input voltage, 17V as output voltage, and 80A as output current as an example for explanation, when K4 is 80, K5 is 0.1, K6 is 0.5, and K7 is 30, the target capacitance value can be calculated according to the capacitance value calculation formula: Δv=0.1×17=1.7, Δi=0.5×80=40, c= (80×40)/1.7= 1882.35uF. Then, the duty cycle to be selected may be calculated according to an empirical calculation formula as: d= 1882.35/30= 62.745, the duty cycle to be selected can be an integer of 60%.
Alternatively, step 1022 may be implemented by:
And adjusting preset parameters within a preset threshold range to increase or decrease the duty ratio to be selected, respectively controlling a plurality of second control switches according to the plurality of adjusted duty ratios to be selected, and acquiring a current peak value corresponding to each adjusted duty ratio to be selected.
And taking the adjusted duty ratio to be selected corresponding to the smallest current peak value as a target duty ratio in the current peak value corresponding to the plurality of adjusted duty ratios to be selected.
Specifically, the preset parameters can be adjusted within a preset threshold range to increase or decrease the duty ratio to be selected, and then after the preset parameters are adjusted each time, the plurality of second control switches are controlled according to the duty ratio to be selected after the adjustment. And simultaneously, in the process of controlling the plurality of second control switches according to the duty ratio to be selected after the adjustment, acquiring a current peak value of the low-voltage side of the transformer, and taking the current peak value as a current peak value corresponding to the duty ratio to be selected after the adjustment. And finally, taking the adjusted duty ratio to be selected corresponding to the minimum current peak value as a target duty ratio in the current peak value corresponding to the plurality of adjusted duty ratios to be selected.
It should be noted that, according to different application scenarios, the preset threshold range may be different. For example, when the phase-shifted full-bridge inverter is used to implement a charge-discharge function for a battery, and the low-voltage module includes a target capacitance, the preset threshold range may be: 25< k7<35, at this time, the adjustment range of the duty cycle to be selected may be: c3/35< D < C3/25.
In summary, the present disclosure firstly obtains an output voltage of a low-voltage module and an output current of the low-voltage module, then determines a target duty ratio corresponding to a plurality of second control switches according to the output voltage and the output current, then controls the plurality of second control switches according to the target duty ratio, and controls the plurality of first control switches according to a specified duty ratio, so that the phase-shifting full-bridge converter outputs the target voltage. According to the method and the device, the target duty ratio higher than the specified duty ratio of the high-voltage side can be determined through the output voltage and the output current of the low-voltage side, and the second control switch is controlled according to the target duty ratio, so that the duty ratio of the low-voltage side can be dynamically adjusted while the carrying capacity of the phase-shifting full-bridge converter is ensured, the phase-shifting full-bridge converter can be suitable for more application scenes, the practicability and the expansibility of the phase-shifting full-bridge converter are improved, and the current stress of the low-voltage side can be reduced, the heating value of the second control switch of the low-voltage side is reduced, and the safety of the phase-shifting full-bridge converter is improved by limiting the target duty ratio to be smaller than the specified duty ratio.
Fig. 4 is a block diagram illustrating a control apparatus 700 of a phase-shifted full-bridge inverter according to an exemplary embodiment. As shown in fig. 4, the control device 700 of the phase-shifted full-bridge inverter may include: a processor 701, a memory 702. The control device 700 of the phase-shifted full-bridge inverter may also include one or more of a multimedia component 703, an input/output (I/O) interface 704, and a communication component 705.
The processor 701 is configured to control the overall operation of the control device 700 of the phase-shifting full-bridge inverter, so as to complete all or part of the steps in the control method of the phase-shifting full-bridge inverter. The memory 702 is used to store various types of data to support the operation of the control device 700 of the phase-shifted full-bridge inverter, which may include, for example, instructions for any application or method operating on the control device 700 of the phase-shifted full-bridge inverter, as well as application-related data, such as contact data, messages, pictures, audio, video, and the like. The Memory 702 may be implemented by any type or combination of volatile or non-volatile Memory devices, such as static random access Memory (Static Random Access Memory, SRAM for short), electrically erasable programmable Read-Only Memory (ELECTRICALLY ERASABLE PROGRAMMABLE READ-Only Memory, EEPROM for short), erasable programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM for short), programmable Read-Only Memory (Programmable Read-Only Memory, PROM for short), read-Only Memory (ROM for short), magnetic Memory, flash Memory, magnetic disk, or optical disk. The multimedia component 703 can include a screen and an audio component. Wherein the screen may be, for example, a touch screen, the audio component being for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signals may be further stored in the memory 702 or transmitted through the communication component 705. The audio assembly further comprises at least one speaker for outputting audio signals. The I/O interface 704 provides an interface between the processor 701 and other interface modules, which may be a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication module 705 is used for wired or wireless communication between the control device 700 of the phase-shifted full-bridge inverter and other devices. Wireless Communication, such as Wi-Fi, bluetooth, near Field Communication (NFC) for short, 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or one or a combination of more of them, is not limited herein. The corresponding communication component 705 may thus comprise: wi-Fi module, bluetooth module, NFC module, etc.
In an exemplary embodiment, the control apparatus 700 of the phase-shifting full-bridge inverter may be implemented by one or more Application-specific integrated circuits (ASIC), digital signal processors (DIGITAL SIGNAL Processor, DSP), digital signal processing devices (DIGITAL SIGNAL Processing Device, DSPD), programmable logic devices (Programmable Logic Device, PLD), field programmable gate arrays (Field Programmable GATE ARRAY, FPGA), controllers, microcontrollers, microprocessors, or other electronic components for performing the control method of the phase-shifting full-bridge inverter described above.
In another exemplary embodiment, a computer readable storage medium is also provided, comprising program instructions which, when executed by a processor, implement the steps of the method of controlling a phase-shifting full-bridge inverter described above. For example, the computer readable storage medium may be the memory 702 including program instructions described above, which are executable by the processor 701 of the control apparatus 700 of the phase-shifted full-bridge inverter to perform the control method of the phase-shifted full-bridge inverter described above.
Fig. 5 is a block diagram illustrating a phase-shifted full-bridge converter according to an exemplary embodiment. As shown in fig. 5, the phase-shifted full-bridge inverter 200 includes a high-voltage module 1, a low-voltage module 2, a transformer 3, and a control device 700 shown in fig. 4. The high voltage module 1 is connected with the low voltage module 2 through the transformer 3, the high voltage module 1 comprises a plurality of first control switches, the low voltage module 2 comprises a plurality of second control switches, and the control device 700 is respectively connected with the high voltage module 1 and the low voltage module 2.
In one scenario, as shown in fig. 6, the high voltage module 1 may include a first control switch 11, a second control switch 12, a third control switch 13, a fourth control switch 14, a first capacitor 15, a second capacitor 16, and a first inductor 17. The first end of the first control switch 11 is connected to the first end of the third control switch 13 and the first end of the first capacitor 15, respectively, and the second end of the second control switch 12 is connected to the second end of the fourth control switch 14 and the second end of the first capacitor 15, respectively. The second end of the first control switch 11 is connected to the first end of the second control switch 12 and the first end of the second capacitor 16, respectively, and the second end of the second capacitor 16 is connected to the first end of the first inductor 17. The second end of the first inductor 17 is connected to the first end of the low voltage side of the transformer 3, and the second end of the third control switch 13 is connected to the first end of the fourth control switch 14 and the second end of the low voltage side of the transformer 3, respectively. The first end of the first control switch 11 and the second end of the second control switch 12 serve as input terminals for the high voltage module 1.
The low voltage module 2 may include a fifth control switch 21, a sixth control switch 22, a seventh control switch 23, an eighth control switch 24, a target capacitance 25, and a second inductance 26. The first end of the fifth control switch 21 is connected to the first end of the seventh control switch 23, the first end of the target capacitor 25, and the first end of the second inductor 26, respectively, and the second end of the sixth control switch 22 is connected to the second end of the eighth control switch 24 and the second end of the target capacitor 25, respectively. The second terminal of the fifth control switch 21 is connected to the first terminal of the sixth control switch 22 and the first terminal of the high-voltage side of the transformer 3, respectively, and the second terminal of the seventh control switch 23 is connected to the first terminal of the eighth control switch 24 and the second terminal of the high-voltage side of the transformer 3, respectively. A second terminal of the second inductor 26 and a second terminal of the eighth control switch 24 serve as output terminals of the low voltage module 2.
For example, when the phase-shifted full-bridge converter is applied in series in a loop, the output voltage of the low-voltage module 2 (i.e., uo in fig. 6) and the output current of the low-voltage module 2 (i.e., ic in fig. 6) may be first obtained by a current detection device (e.g., a current sensor) and a voltage detection device (e.g., a voltage sensor). And then, calculating the duty ratios to be selected corresponding to all the second control switches according to the output voltage and the output current. And then, the duty ratio to be selected can be changed within a preset parameter range to debug the phase-shifting full-bridge converter so as to find the target duty ratio. And finally, controlling all the second control switches according to the target duty ratio, and controlling all the first control switches according to the designated duty ratio so as to enable the phase-shifting full-bridge converter to output corresponding target voltage according to the output parameter index.
Because the target duty ratio is greater than 50% (i.e. the duty ratio of the low-voltage side of the phase-shifting full-bridge converter is greater than 50%), at a certain moment, the fifth control switch 21 and the sixth control switch 22 are turned on simultaneously, or the seventh control switch 23 and the eighth control switch 24 are turned on simultaneously, at this moment, the low-voltage side of the transformer 3 can present a short-circuit state, and the energy of the transformer 3 cannot be transmitted to the low-voltage side of the transformer 3, so that the increase of the peak value of the current peak of the low-voltage side of the transformer 3 is restrained, the current stress of the low-voltage module 2 is reduced, and at this moment, the output current of the low-voltage module 2 is provided by the target capacitor 25, and the load carrying capacity of the phase-shifting full-bridge converter can be ensured. In addition, as the current stress of the low-voltage module is reduced, the turn-on loss of the second control switch of the low-voltage module is also reduced, and the heating value of the second control switch is further reduced.
Fig. 7 is a block diagram illustrating a control system of a phase-shifted full-bridge inverter according to an exemplary embodiment. As shown in fig. 7, the control system 300 includes the phase-shifted full-bridge inverter 200 and the control device 700 shown in fig. 4, and the phase-shifted full-bridge inverter 200 is connected to the control device 700.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the embodiments described above, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (9)
1. The control method of the phase-shifting full-bridge converter is characterized in that the phase-shifting full-bridge converter comprises a high-voltage module, a low-voltage module and a transformer; the high-voltage module is connected with the low-voltage module through the transformer; the high voltage module includes a plurality of first control switches, and the low voltage module includes a plurality of second control switches; the method comprises the following steps:
obtaining the output voltage of the low-voltage module and the output current of the low-voltage module;
Determining target duty ratios corresponding to the plurality of second control switches according to the output voltage and the output current;
The plurality of second control switches are controlled according to the target duty ratio, and the plurality of first control switches are controlled according to the designated duty ratio so that the phase-shifting full-bridge converter outputs target voltage;
Wherein the target duty cycle is greater than the specified duty cycle;
The determining, according to the output voltage and the output current, the target duty ratios corresponding to the plurality of second control switches includes:
determining the duty ratios to be selected corresponding to the second control switches according to the output voltage and the output current;
And determining the target duty ratio according to the duty ratio to be selected and the current peak value of the low-voltage side of the transformer.
2. The method of claim 1, wherein determining the duty cycles to be selected for the plurality of second control switches based on the output voltage and the output current comprises:
Determining the duty ratio to be selected according to the output voltage and the output current and based on a preset relation; the preset relation is to determine a target current parameter according to the output current and the first parameter, determine a target voltage parameter according to the output voltage and the second parameter, and determine the duty ratio to be selected according to the ratio of the target current parameter to the target voltage parameter and the preset parameter.
3. The method of claim 1, wherein the low voltage module includes a target capacitance, the target capacitance being connected to an output of the low voltage module; the determining the duty ratios to be selected corresponding to the plurality of second control switches according to the output voltage and the output current includes:
And determining a target capacitance value corresponding to the target capacitance according to the output voltage and the output current, and determining the duty ratio to be selected according to the target capacitance value and a preset parameter.
4. A method according to claim 2 or 3, wherein said determining said target duty cycle from said duty cycle to be selected and a current peak to peak value at a low voltage side of said transformer comprises:
adjusting the preset parameters within a preset threshold range to increase or decrease the duty ratio to be selected, respectively controlling the plurality of second control switches according to the plurality of adjusted duty ratios to be selected, and acquiring the current peak value corresponding to each adjusted duty ratio to be selected;
And taking the adjusted duty ratio to be selected corresponding to the smallest current peak value as the target duty ratio in the current peak value corresponding to the plurality of adjusted duty ratios to be selected.
5. A method according to any one of claims 1-3, wherein the specified duty cycle is 50%.
6. A control device for a phase-shifted full-bridge inverter, the control device comprising:
A memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method of any one of claims 1-5.
7. A phase-shifted full-bridge inverter comprising a high voltage module, a low voltage module, a transformer, and the control device of claim 6; the high-voltage module is connected with the low-voltage module through the transformer; the high voltage module includes a plurality of first control switches, and the low voltage module includes a plurality of second control switches; the control device is respectively connected with the high-voltage module and the low-voltage module.
8. The phase-shifting full-bridge inverter of claim 7, wherein the high voltage module comprises a first control switch, a second control switch, a third control switch, a fourth control switch, a first capacitor, a second capacitor, and a first inductor; the first end of the first control switch is respectively connected with the first end of the third control switch and the first end of the first capacitor, and the second end of the second control switch is respectively connected with the second end of the fourth control switch and the second end of the first capacitor; the second end of the first control switch is respectively connected with the first end of the second control switch and the first end of the second capacitor, and the second end of the second capacitor is connected with the first end of the first inductor; the second end of the first inductor is connected with the first end of the high-voltage side of the transformer, and the second end of the third control switch is respectively connected with the first end of the fourth control switch and the second end of the high-voltage side of the transformer; a first end of the first control switch and a second end of the second control switch are used as input ends of the high-voltage module;
The low-voltage module comprises a fifth control switch, a sixth control switch, a seventh control switch, an eighth control switch, a target capacitor and a second inductor; the first end of the fifth control switch is respectively connected with the first end of the seventh control switch, the first end of the target capacitor and the first end of the second inductor, and the second end of the sixth control switch is respectively connected with the second end of the eighth control switch and the second end of the target capacitor; the second end of the fifth control switch is respectively connected with the first end of the sixth control switch and the first end of the low-voltage side of the transformer, and the second end of the seventh control switch is respectively connected with the first end of the eighth control switch and the second end of the low-voltage side of the transformer; the second end of the second inductor and the second end of the eighth control switch are used as output ends of the low-voltage module.
9. A control system for a phase-shifted full-bridge inverter, the control system comprising a phase-shifted full-bridge inverter and the control device of claim 6; the phase-shifting full-bridge converter is connected with the control device.
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| CN114499210A (en) * | 2022-02-25 | 2022-05-13 | 北京信息科技大学 | A control method of high frequency resonant bidirectional isolated DC/DC converter |
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| KR101520257B1 (en) * | 2013-10-29 | 2015-06-05 | 한국전기연구원 | Bidirectional dc to dc converter and method for charging battery by using the same |
| US9973099B2 (en) * | 2015-08-26 | 2018-05-15 | Futurewei Technologies, Inc. | AC/DC converters with wider voltage regulation range |
| CN106329937A (en) * | 2016-09-08 | 2017-01-11 | 中车大连电力牵引研发中心有限公司 | Bidirectional phase-shift full-bridge DC-DC converter |
| CN106712522B (en) * | 2017-01-20 | 2019-02-15 | 北京理工大学 | PWM-Phase-shifting Composite Control Method of Semi-active Bridge DC-DC Converter |
| US10804808B1 (en) * | 2019-07-03 | 2020-10-13 | Deere & Company | Method and system for controlling switching of a direct current to direct current converter |
| CN112054693B (en) * | 2020-09-14 | 2022-03-08 | 重庆大学 | Double-active-bridge asymmetric duty ratio optimization modulation method |
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| CN113364300A (en) * | 2021-06-28 | 2021-09-07 | 上海电机学院 | Dual-active-bridge asymmetric-symmetric duty ratio hybrid optimization modulation control method |
| CN114499210A (en) * | 2022-02-25 | 2022-05-13 | 北京信息科技大学 | A control method of high frequency resonant bidirectional isolated DC/DC converter |
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