CN116545272A - Direct current converter, control method, electronic equipment and vehicle - Google Patents
Direct current converter, control method, electronic equipment and vehicle Download PDFInfo
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- CN116545272A CN116545272A CN202310823734.9A CN202310823734A CN116545272A CN 116545272 A CN116545272 A CN 116545272A CN 202310823734 A CN202310823734 A CN 202310823734A CN 116545272 A CN116545272 A CN 116545272A
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000003990 capacitor Substances 0.000 claims abstract description 50
- 238000006243 chemical reaction Methods 0.000 claims abstract description 32
- 238000004590 computer program Methods 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 description 12
- 230000008569 process Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 10
- 230000008901 benefit Effects 0.000 description 7
- 238000004891 communication Methods 0.000 description 7
- 230000001360 synchronised effect Effects 0.000 description 7
- 238000002955 isolation Methods 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000005389 magnetism Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
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- 230000004048 modification Effects 0.000 description 2
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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
- 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
- H02M3/33576—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 having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—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 having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The embodiment of the application provides a direct current converter, a control method, electronic equipment and a vehicle, wherein the direct current converter comprises: the device comprises a transformer, a power conversion circuit, a symmetrical capacitance circuit and a magnetic energy release follow current circuit; the symmetrical capacitor circuit, the power conversion circuit and the input end line are connected in parallel; the first end of the primary side of the transformer is connected with the midpoint of the symmetrical capacitor circuit; the second end of the primary side of the transformer is connected with the middle part of the power conversion circuit; the magnetic energy release freewheel circuit is connected with the power conversion circuit. The direct current converter is suitable for the high-voltage flat trolley, can continuously use voltage-resistant components such as a power device, a filter capacitor and the like in the original low-voltage flat trolley direct current converter scheme, does not need to improve the limit voltage-resistant value, can isolate follow current of leakage inductance magnetic energy of the transformer, reduces partial heat energy of the transformer, which is accumulated and converted due to the leakage inductance magnetic energy, and improves the overall efficiency of input and output.
Description
Technical Field
The application relates to the technical field of new energy automobiles, in particular to a direct current converter, a control method, electronic equipment and a vehicle.
Background
The direct current converter is used as an important high-voltage part of the new energy automobile, converts the high voltage of the power battery into a proper target voltage and supplies power for all low-voltage control units of the whole automobile. The working voltage range of the high-voltage parts is closely related to the voltage range of the whole vehicle network platform. In order to reduce development cost, improve efficiency and shorten charging time, the high-voltage of a whole vehicle voltage platform is one of the trends of new energy automobiles. The current direct current converter scheme is usually a full-bridge or half-bridge current-doubling synchronous rectification circuit and a full-bridge or half-bridge center tap type synchronous rectification circuit, the voltage of a power battery is converted into high-frequency alternating current through a primary side circuit to generate a high-frequency magnetic field, electric energy is transmitted to a secondary side in equal proportion through an isolation transformer, and 12V or 24V or other target voltages with special instructions are obtained through the synchronous rectification circuit of the secondary side circuit to provide power for all low-voltage control units of the whole vehicle. Under the background of the trend of the whole vehicle high-voltage platform, if the same direct-current converter scheme is used, the primary side power device must be replaced by a limiting high-voltage-resistant version device, the filter capacitor also needs to be replaced by a high-voltage capacitor, otherwise, the filter capacitor cannot bear the high voltage of the high-voltage power battery, and breakdown components cause damage. Compared with the low-voltage platform vehicle type, the same high-voltage component has the advantages that the cost of a power device and the cost of a filter voltage-resistant capacitor are obviously improved, the cost of the whole vehicle is increased, and the economic benefit is reduced. Thus, the above-mentioned synchronous rectification dc converter scheme is applicable to the low-voltage trolley type.
Along with the development trend of high voltage of new energy automobiles, the existing direct current converter scheme technology is applied to high-voltage platform automobile types, and components such as power devices, voltage-resistant capacitors and the like are required to be improved in voltage-resistant level, so that the cost is greatly improved, and the sales economic benefit of the whole automobile is reduced.
Disclosure of Invention
The embodiment of the application aims to provide a direct current converter, a control method, electronic equipment and a vehicle, aiming at a high-voltage trolley, voltage-resistant components such as a power device and a filter capacitor in the original low-voltage trolley direct current converter scheme can be continuously used, the limit voltage-resistant value of the voltage-resistant components is not required to be improved, follow currents of leakage inductance magnetic energy of an isolation transformer can be realized, partial heat energy of the transformer due to accumulation and conversion of the leakage inductance magnetic energy is reduced, and the overall efficiency of input and output is improved.
In a first aspect, an embodiment of the present application provides a dc converter, including:
the device comprises a transformer, a power conversion circuit, a symmetrical capacitance circuit and a magnetic energy release follow current circuit;
the symmetrical capacitor circuit, the power conversion circuit and the input end line are connected in parallel;
the first end of the primary side of the transformer is connected with the midpoint of the symmetrical capacitor circuit;
the second end of the primary side of the transformer is connected with the middle part of the power conversion circuit;
the magnetic energy release freewheel circuit is connected with the power conversion circuit.
In the implementation process, the symmetrical capacitor circuit reduces high-voltage stress, is used for stabilizing the voltage of a bus and filtering clutter, and the magnetic energy releases the follow current circuit to provide a follow current channel for releasing magnetic energy of leakage inductance, so that the direct current converter is suitable for a high-voltage trolley type, can continuously use voltage-resistant components such as a power device, a filter capacitor and the like in the original low-voltage trolley type direct current converter scheme, does not need to improve the limit voltage-resistant value, can also realize follow current of the leakage inductance magnetic energy of an isolation transformer, reduces part of heat energy of the transformer due to accumulation and conversion of the leakage inductance magnetic energy, and improves the integral efficiency of input and output.
With reference to the first implementation manner of the first aspect, the magnetic energy release flywheel circuit includes:
the first diode, the second diode and the third capacitor;
the first diode and the second diode form a diode branch, and the diode branch is connected in parallel with the third capacitor;
and the first end of the third capacitor is connected with the first connecting point of the power conversion circuit, and the second end of the third capacitor is connected with the second connecting point of the power conversion circuit.
With reference to the second implementation manner of the first aspect, the secondary side of the transformer includes a secondary side first self-inductance and a secondary side second self-inductance;
the first end of the first self-inductance of the secondary side is connected with the second end of the output end through a second power switch;
the second end of the secondary side second self-inductance is connected with the second end of the output end through a first power switch;
the second end of the first self-inductance of the secondary side, the first end of the second self-inductance of the secondary side and the first end of the output end are connected.
With reference to the third implementation manner of the first aspect, the second end of the first self-inductance of the secondary side and the first end of the second self-inductance of the secondary side are connected with the first end of the output end through a filter inductor;
the output end is connected with a filter capacitor in parallel.
With reference to the fourth implementation manner of the first aspect, the power conversion circuit is formed by sequentially connecting a third power switch, a fourth power switch, a fifth power switch and a sixth power switch;
the first connection point is a connection point of the third power switch and the fourth power switch;
the second connection point is a connection point of the fifth power switch and the sixth power switch.
In a second aspect, a control method of a dc converter provided by an embodiment of the present application is applied to a dc converter of a fourth embodiment of the first aspect, where the method includes:
controlling the third power switch and the fourth power switch to be on in the first sub-period, and closing the fifth power switch and the sixth power switch;
controlling the fourth power switch to be conducted in a second sub-period, and closing the third power switch, the fifth power switch and the sixth power switch;
controlling the third power switch, the fourth power switch, the fifth power switch and the sixth power switch to be closed in a third sub-period;
controlling the fifth power switch and the sixth power switch to be conducted in a fourth sub-period, wherein the third power switch and the fourth power switch are turned off;
controlling the sixth power switch to be closed in a fifth sub-period, wherein the third power switch, the fourth power switch and the fifth power switch are closed;
and controlling the third power switch, the fourth power switch, the fifth power switch and the sixth power switch to be closed in a sixth sub-period.
Further, the first power switch is controlled to be turned on in the first sub-period, the second sub-period and the third sub-period, and the second power switch is controlled to be turned off;
and controlling the first power switch to be turned off and the second power switch to be turned on in the fourth sub-period, the fifth sub-period and the sixth sub-period.
In a third aspect, an electronic device provided in an embodiment of the present application includes: a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method according to any one of the first aspects when the computer program is executed.
In a fourth aspect, embodiments of the present application provide a vehicle including the dc converter of the first aspect.
In a fifth aspect, an embodiment of the present application provides a vehicle including the control method of the dc converter described in the second aspect.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part will be obvious from the description, or may be learned by practice of the techniques disclosed herein.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a dc converter according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a control method of a dc converter according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, an embodiment of the present application provides a dc converter, including:
the device comprises a transformer, a power conversion circuit, a symmetrical capacitance circuit and a magnetic energy release follow current circuit;
the symmetrical capacitor circuit, the power conversion circuit and the input end are connected in parallel;
the first end of the primary side Lp of the transformer is connected with the midpoint of the symmetrical capacitor circuit;
the second end of the primary side Lp of the transformer is connected with the middle part of the power conversion circuit;
the magnetic energy release freewheel circuit is connected with the power conversion circuit.
In some embodiments, the input is a bus, and the symmetrical capacitance circuit and the power conversion circuit are connected in parallel with the bus.
In the above embodiment, the symmetrical capacitance circuit is connected to the power conversion circuit and the voltage input terminal. In fig. 1, vin is an input voltage U0 and is an output voltage.
In the implementation process, the symmetrical capacitor circuit reduces high-voltage stress, is used for stabilizing the voltage of a bus and filtering clutter, and the magnetic energy releases the follow current circuit to provide a follow current channel for releasing magnetic energy of leakage inductance, so that the direct current converter is suitable for a high-voltage trolley type, can continuously use voltage-resistant components such as a power device, a filter capacitor and the like in the original low-voltage trolley type direct current converter scheme, does not need to improve the limit voltage-resistant value, can also realize follow current of the leakage inductance magnetic energy of an isolation transformer, reduces part of heat energy of the transformer due to accumulation and conversion of the leakage inductance magnetic energy, and improves the integral efficiency of input and output.
In some embodiments, the symmetrical capacitance comprises: a first capacitor C1 and a second capacitor C2; the first capacitor C1 and the second capacitor C2 are connected in series.
In the above implementation process, the voltages of the first capacitor C1 and the second capacitor C2 are equal to half of the input voltage Vin, and when the input voltage Vin is high, the high voltage stress can be reduced.
In some embodiments, the magnetic energy release freewheel circuit includes: a first diode D1, a second diode D2, and a third capacitor C3; the first diode D1 and the second diode D2 form a diode branch, and the diode branch is connected in parallel with the third capacitor C3; and the first end of the third capacitor C3 is connected with the first connection point of the power conversion circuit, and the second end of the third capacitor C is connected with the second connection point of the power conversion circuit.
With reference to the second implementation manner of the first aspect, the secondary side of the transformer includes a secondary side first self-inductance Ls1 and a secondary side second self-inductance Ls2;
the first end of the secondary side first self-inductance Ls1 is connected with the second end of the output end through the second power switch S2;
the second end of the secondary side second self-inductance Ls2 is connected with the second end of the output end through the first power switch S1;
the second end of the secondary side first self-inductance Ls1, the first end of the secondary side second self-inductance Ls2 and the first end of the output end are connected.
The second power switch S2 and the first power switch S1 are N-Mos tubes, the S terminal of the second power switch S2 is connected to the first terminal of the second self-inductance Ls 2/the second terminal of the first self-inductance Ls1, and the D terminal of the first power switch S1 is connected to the second terminal of the output terminal; the end D of the first power switch S1 is connected with the second end of the output end, and the end S of the first power switch S1 is connected with the first end of the first self-inductance Ls 1. The second power switch S2 and the first power switch S1 are also connected in parallel with a diode; the diode is turned on unidirectionally from the D terminal to the S terminal.
In some embodiments, the second end of the secondary side first self-inductance Ls1 and the first end of the secondary side second self-inductance Ls2 are connected with the first end of the output end through a filter inductor L0;
the output end is connected in parallel with a filter capacitor C0.
The secondary side circuit has various forms and can also be a center tap type synchronous rectification circuit, a double current synchronous rectification circuit, a full bridge synchronous rectification circuit and the like.
In some embodiments, the power conversion circuit is formed by sequentially connecting a third power switch Q1, a fourth power switch Q2, a fifth power switch Q4 and a sixth power switch Q3;
the first connection point is a connection point of the third power switch Q1 and the fourth power switch Q2;
the second connection point is the connection point of the fifth power switch Q4 and the sixth power switch Q3.
In some embodiments, the primary side LP of the transformer is connected to the connection point of the fourth power switch Q2 and the fifth power switch Q4.
The third power switch Q1, the fourth power switch Q2, the fifth power switch Q4 and the sixth power switch Q3 are exemplified by N-Mos tubes, and the S terminal of the third power switch Q1 is connected to the D terminal of the fourth power switch Q2; the S end of the fourth power switch Q2 tube is connected with the D end of the fifth power switch Q4; the S end of the fifth power switch Q4 tube is connected with the D end of the sixth power switch Q3.
Diodes are connected in parallel to the D end and the S end of the third power switch Q1, the fourth power switch Q2, the fifth power switch Q4 and the sixth power switch Q3, and the diodes are conducted unidirectionally from the D end to the S end.
It should be noted that the third power switch Q1, the fourth power switch Q2, the fifth power switch Q4, and the sixth power switch Q3 may be formed by connecting a plurality of power switches, and the connection manner is the same as the connection manner between the third power switch Q1, the fourth power switch Q2, the fifth power switch Q4, and the sixth power switch Q3.
It will be appreciated that the transformer has an equivalent inductance L1, and that in the circuit diagram the equivalent inductance L1 is connected in series with the primary side Lp of the transformer.
Referring to fig. 2, a control method of a dc converter provided in an embodiment of the present application is applied to a dc converter of a fourth implementation manner of the first aspect, and the method includes:
s1: controlling the third power switch Q1 and the fourth power switch Q2 to be conducted in the first sub-period, and the fifth power switch Q4 and the sixth power switch Q3 to be turned off;
in the implementation process, when the third power switch Q1 and the fourth power switch Q2 are turned on simultaneously and the fifth power switch Q4 and the sixth power switch Q3 are turned off, the electric charge stored in the first capacitor C1 forms a loop through the first capacitor C1-the third power switch Q1-the fourth power switch Q2-the equivalent inductor L1-the primary side Lp-the circuit channel of the first capacitor C1, the equivalent inductor L1 stores electric energy as magnetic energy, and the primary side Lp establishes the primary side Lp voltage to transfer energy through electromagnetic conversion to the secondary side;
s2: the fourth power switch Q2 is controlled to be turned on in the second sub-period, and the third power switch Q1, the fifth power switch Q4 and the sixth power switch Q3 are turned off;
in the implementation process, when the third power switch Q1, the fifth power switch Q4 and the sixth power switch Q3 are all closed, magnetic energy stored by the equivalent inductor L1 forms follow current through the equivalent inductor L1-primary side Lp-first diode D1-third power switch Q1-equivalent inductor L1 channel, and energy is continuously provided for the secondary side;
s3: controlling the third power switch Q1, the fourth power switch Q2, the fifth power switch Q4 and the sixth power switch Q3 to be closed in the third sub-period;
in the implementation process, when the third power switch Q1, the fourth power switch Q2, the fifth power switch Q4 and the sixth power switch Q3 are all turned off, if the equivalent inductor L1 still stores residual magnetism, the residual magnetism is released through the equivalent inductor L1-primary side Lp-first diode D1-third capacitor C3-sixth power switch Q3-equivalent inductor L1 channel, so that the residual magnetic energy of the isolation transformer is reduced, namely the heating of the transformer is reduced;
s4: controlling the fifth power switch Q4 and the sixth power switch Q3 to be on in the fourth sub-period, and closing the third power switch Q1 and the fourth power switch Q2;
in the implementation process, when the fifth power switch Q4 and the sixth power switch Q3 are turned on at the same time and the third power switch Q1 and the fourth power switch Q2 are turned off, the charge stored in the second capacitor C2 establishes voltage transmission energy to the secondary side Lp through the path between the second capacitor C2 and the primary side Lp-equivalent inductor L1 and between the sixth power switch Q3 and the fifth power switch Q4-second capacitor C2;
s5: controlling the sixth power switch Q3 to be closed in the fifth sub-period, and closing the third power switch Q1, the fourth power switch Q2 and the fifth power switch Q4;
in the implementation process, when the sixth power switch Q3 is turned on and the third power switch Q1, the fourth power switch Q2 and the fifth power switch Q4 are all in the off state, the magnetic energy of the equivalent inductor L1 forms a loop through the equivalent inductor L1-the sixth power switch Q3-the second diode D2-the primary side Lp-the equivalent inductor L1, and energy is continuously provided for the secondary side;
s6: the third, fourth, fifth and sixth power switches Q1, Q2, Q4 and Q3 are controlled to be turned off in the sixth sub-period.
In the above embodiment, at least one of the multiple sub-periods may be arranged reasonably, and only the energy of the equivalent inductance L1 needs to be released in real time.
In the implementation process, when all of the third power switch Q1, the fourth power switch Q2, the fifth power switch Q4 and the sixth power switch Q3 are in the off state, the paths of the equivalent inductor L1, the fourth power switch Q2, the third capacitor C3, the second diode D2, the primary Lp and the equivalent inductor L1 continue to release the residual magnetism. In this partial conversion, the voltage homonymous terminal established by the primary side Lp is negative, the second power switch S2 turns off the first power switch S1 to be turned on, and energy is output.
Further, the first power switch S1 is controlled to be turned on in the first sub-period, the second sub-period and the third sub-period, and the second power switch S2 is controlled to be turned off;
and in the fourth sub-period, the fifth sub-period and the sixth sub-period, the first power switch S1 is controlled to be closed, and the second power switch S2 is controlled to be opened.
The power switching tubes of the primary side Lp and the secondary side synchronously and periodically transform, and the target voltage is obtained through load end filtering. Note that the primary Lp third power switch Q1, the fourth power switch Q2, the fifth power switch Q4 and the sixth power switch Q3 are prohibited from being turned on simultaneously, the second power switch S2 and the first power switch S1 are turned on and off complementarily, and are not allowed to be turned on simultaneously, otherwise, a power short circuit is caused, and the power switch tubes are damaged. When the control algorithm is designed, proper dead time is required to be designed for circuit mode switching, so that the short circuit of a power supply caused by bridge arm direct-pass is prevented, and the gradual accumulation of magnetic energy of a transformer in periodic transformation and overheating of the transformer are also prevented.
The symmetrical structure of the first capacitor C1 and the second capacitor C2 reduces the high-voltage stress of the power switch tube, reduces the cost and improves the economic benefit in the high-voltage trolley type application, and the efficiency of the direct-current converter is improved through the design of a control algorithm. The scheme control mode is usually a duty ratio modulation method, the duty ratio is modulated by sampling and outputting a target voltage in a closed loop mode, the output voltage is regulated to reach a target value, the duty ratio is finely tuned in real time, the output voltage is stabilized, and the constant-voltage output of the direct-current converter is realized. There are various ways of controlling the algorithm, which can be selected according to the actual situation. Therefore, the direct current converter scheme provided by the embodiment of the application can reduce the high-voltage stress of the power switch tube, is convenient for type selection, reduces development cost and improves economic benefit.
The application further provides an electronic device, please refer to fig. 3, and fig. 3 is a block diagram of an electronic device according to an embodiment of the application. The electronic device may include a processor 31, a communication interface 32, a memory 33, and at least one communication bus 34. Wherein the communication bus 34 is used to enable direct connection communication of these components. The communication interface 32 of the electronic device in the embodiment of the present application is used for performing signaling or data communication with other node devices. The processor 31 may be an integrated circuit chip with signal processing capabilities.
The processor 31 may be a general-purpose processor, including a central processing unit (CPU, centralProcessingUnit), a network processor (NP, networkProcessor), etc.; but may also be a Digital Signal Processor (DSP), application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. The general purpose processor may be a microprocessor or the processor 31 may be any conventional processor or the like.
The Memory 33 may be, but is not limited to, random access Memory (RAM, randomAccessMemory), read Only Memory (ROM), programmable Read Only Memory (PROM, programmable Read-Only Memory), erasable Read Only Memory (EPROM, erasable Programmable Read-Only Memory), electrically erasable Read Only Memory (EEPROM, electric Erasable Programmable Read-Only Memory), and the like. The memory 33 has stored therein computer readable instructions which, when executed by the processor 31, can cause the electronic device to perform the steps involved in the above-described method embodiments.
Optionally, the electronic device may further include a storage controller, an input-output unit.
The memory 33, the memory controller, the processor 31, the peripheral interface, and the input/output unit are electrically connected directly or indirectly to each other, so as to realize data transmission or interaction. For example, the components may be electrically coupled to each other via one or more communication buses 34. The processor 31 is arranged to execute executable modules stored in the memory 33, such as software functional modules or computer programs comprised by the electronic device.
The input-output unit is used for providing the user with the creation task and creating the starting selectable period or the preset execution time for the task so as to realize the interaction between the user and the server. The input/output unit may be, but is not limited to, a mouse, a keyboard, and the like.
It will be appreciated that the configuration shown in fig. 3 is merely illustrative, and that the electronic device may also include more or fewer components than shown in fig. 3, or have a different configuration than shown in fig. 3. The components shown in fig. 3 may be implemented in hardware, software, or a combination thereof.
The embodiment of the application provides a vehicle, which comprises the direct current converter.
The embodiment of the application provides a vehicle, which comprises the control method of the direct current converter.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other manners as well. The apparatus embodiments described above are merely illustrative, for example, flow diagrams and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present application may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely exemplary embodiments of the present application and is not intended to limit the scope of the present application, and various modifications and variations may be suggested to one skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A dc converter, comprising: the device comprises a transformer, a power conversion circuit, a symmetrical capacitance circuit and a magnetic energy release follow current circuit;
the symmetrical capacitor circuit, the power conversion circuit and the input end line are connected in parallel;
the first end of the primary side of the transformer is connected with the midpoint of the symmetrical capacitor circuit;
the second end of the primary side of the transformer is connected with the middle part of the power conversion circuit;
the magnetic energy release freewheel circuit is connected with the power conversion circuit.
2. The direct current converter according to claim 1, wherein the magnetic energy release freewheel circuit includes:
the first diode, the second diode and the third capacitor;
the first diode and the second diode form a diode branch, and the diode branch is connected in parallel with the third capacitor;
and the first end of the third capacitor is connected with the first connecting point of the power conversion circuit, and the second end of the third capacitor is connected with the second connecting point of the power conversion circuit.
3. The dc converter of claim 2, wherein the secondary side of the transformer includes a secondary side first self-inductance and a secondary side second self-inductance;
the first end of the first self-inductance of the secondary side is connected with the second end of the output end through a second power switch;
the second end of the secondary side second self-inductance is connected with the second end of the output end through a first power switch;
the second end of the first self-inductance of the secondary side, the first end of the second self-inductance of the secondary side and the first end of the output end are connected.
4. A dc converter according to claim 3, wherein the second end of the secondary side first self-inductance and the first end of the secondary side second self-inductance are connected to the first end of the output end through a filter inductor;
the output end is connected with a filter capacitor in parallel.
5. The direct current converter according to claim 2, wherein the power conversion circuit is formed by sequentially connecting a third power switch, a fourth power switch, a fifth power switch and a sixth power switch;
the first connection point is a connection point of the third power switch and the fourth power switch;
the second connection point is a connection point of the fifth power switch and the sixth power switch.
6. A control method of a dc converter according to claim 5, comprising:
controlling the third power switch and the fourth power switch to be on in the first sub-period, and closing the fifth power switch and the sixth power switch;
controlling the fourth power switch to be conducted in a second sub-period, and closing the third power switch, the fifth power switch and the sixth power switch;
controlling the third power switch, the fourth power switch, the fifth power switch and the sixth power switch to be closed in a third sub-period;
controlling the fifth power switch and the sixth power switch to be conducted in a fourth sub-period, wherein the third power switch and the fourth power switch are turned off;
controlling the sixth power switch to be closed in a fifth sub-period, wherein the third power switch, the fourth power switch and the fifth power switch are closed;
and controlling the third power switch, the fourth power switch, the fifth power switch and the sixth power switch to be closed in a sixth sub-period.
7. The method according to claim 6, wherein the first power switch is turned on and the second power switch is turned off in the first sub-period, the second sub-period, and the third sub-period;
and controlling the first power switch to be turned off and the second power switch to be turned on in the fourth sub-period, the fifth sub-period and the sixth sub-period.
8. An electronic device, comprising: memory, a processor and a computer program stored in the memory and executable on the processor, which processor, when executing the computer program, implements the steps of the method according to claim 6 or 7.
9. A vehicle comprising a dc converter according to any one of claims 1-5.
10. A vehicle characterized in that the method of claim 6 or 7 is performed.
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| CN202310823734.9A CN116545272B (en) | 2023-07-06 | 2023-07-06 | Control method of direct current converter, electronic equipment and vehicle |
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| CN202310823734.9A CN116545272B (en) | 2023-07-06 | 2023-07-06 | Control method of direct current converter, electronic equipment and vehicle |
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| US20170353116A1 (en) * | 2016-06-07 | 2017-12-07 | Linear Technology Corporation | Transformer-based hybrid power converters |
| CN115378266A (en) * | 2021-05-19 | 2022-11-22 | 台达电子企业管理（上海）有限公司 | Converter suitable for wide-range output voltage and control method thereof |
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| CN104779802A (en) * | 2015-03-26 | 2015-07-15 | 西南交通大学 | Optimization control method for minimum current effective value of two-way half-bridge unilateral tri-level DC-DC converter |
| US20170353116A1 (en) * | 2016-06-07 | 2017-12-07 | Linear Technology Corporation | Transformer-based hybrid power converters |
| CN115378266A (en) * | 2021-05-19 | 2022-11-22 | 台达电子企业管理（上海）有限公司 | Converter suitable for wide-range output voltage and control method thereof |
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