CN110912406A - Control method of wide-range high-frequency direct current conversion device - Google Patents

Control method of wide-range high-frequency direct current conversion device Download PDF

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CN110912406A
CN110912406A CN201911132602.1A CN201911132602A CN110912406A CN 110912406 A CN110912406 A CN 110912406A CN 201911132602 A CN201911132602 A CN 201911132602A CN 110912406 A CN110912406 A CN 110912406A
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boost
buck
mode
switch tube
switching tube
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CN110912406B (en
Inventor
张鹏程
李锐
吴浩伟
郑中祥
姜波
金翔
张正卿
蔡凯
蔡久青
邓磊
李可维
帅骁睿
吴钫
魏华
陈涛
罗伟
耿攀
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719th Research Institute of CSIC
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719th Research Institute of CSIC
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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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1582—Buck-boost converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a control method for a high-frequency conversion device, which comprises the following steps of controlling the high-frequency conversion device to switch in a plurality of modes, wherein the modes comprise: the first Boost mode, the second Boost mode, the Buck-Boost mode and the Buck mode. The Buck converter and the three-level Boost converter are combined, so that wide-range operation of input is realized, the short-circuit current-limiting function is realized, and the Buck converter has the characteristics of high efficiency and high power density. The control method of the device is reasonably designed, the capability of the device is explored, and the function of the device is perfected, so that the device can cope with various working conditions.

Description

Control method of wide-range high-frequency direct current conversion device
Technical Field
The invention relates to the field of electric energy conversion, in particular to a three-layer laminated busbar structure of a three-level bridge arm.
Background
In the application fields of new energy micro-grids, direct current distribution networks, full electric ships and the like, energy systems in a power network are usually wind generating sets, solar cells and energy storage systems, the range of the output direct current voltage of the energy systems is usually wide, the fluctuation is large, direct current loads usually need stable direct current voltage, and direct current voltages needed by different direct current loads are different, so that a direct current conversion device with a wide input and output range needs to be adapted. Meanwhile, due to the fact that the direct-current power grid is difficult to protect, direct-current short-circuit current is difficult to extinguish and cut off, the direct-current conversion device is required to have short-circuit current-limiting capacity, and therefore safety of the direct-current power grid is improved. In addition, in the fields of ships, homes, and the like, a high-efficiency and high-density dc converter is required to save electric power and space costs. In a word, in the scenes of a new energy microgrid, a direct-current distribution network, a full-electric ship and the like, the direct-current conversion device connected with the direct-current network has the characteristics of wide input and output range adaptation, short-circuit current limiting, high efficiency and high power density.
The Buck and Boost circuit is one of the most common topological structures in the direct current conversion device, has the advantages of simple control, few switching devices and the like, and is widely applied to the field of industrial direct current conversion. However, the Buck circuit is mainly applied to a voltage reduction occasion, and the Boost circuit is mainly applied to a voltage boosting occasion, has special application scenes and is not suitable for a wide voltage range. The Buck and Boost circuits are cascaded to effectively adapt to a wider voltage range, but the efficiency is reduced due to two-stage conversion, and meanwhile, in order to improve the output performance of the converter, both the filter inductance and the capacitor are large. In order to adapt to high-power application occasions, a plurality of Buck and Boost circuits can be connected in parallel, the use number of inductors is also multiplied, and the volume and the weight are greatly increased. And because conventional Buck and Boost circuits can not realize soft switching, the circuit efficiency is low, the EMI characteristic is poor, and a lot of EMI filtering measures must be added for improving the characteristic.
Disclosure of Invention
In view of the above problems, the present invention proposes a control method for a high-frequency dc conversion apparatus including 1 Buck module M 12 coupled inductors L1、L 22 interleaved three-level Boost modules M2、M3And 2 supporting capacitors C1、C2Wherein the Buck module M1As inputs to the high frequency conversion device, and as outputs to the high frequency conversion device, two ends of the series of 2 support capacitors, wherein the method comprises controlling the high frequency conversion device to switch between a plurality of modes, the modes comprising: a first Boost mode, a second Boost mode, a Buck-Boost mode and a Buck mode,
step (1) obtaining the Buck module M1Input voltage V ofinAnd the output voltage V of the high-frequency conversion deviceo；
Step (2) converting the input voltage VinAnd the output voltage VoComparing;
step (3) when the input voltage V isinBelow the output voltage VoWhen the voltage is/2, controlling the high-frequency conversion device to work in a first Boost mode;
when the input voltage VinGreater than VoA/2 and less than VoWhen the high-frequency conversion device is in the Boost mode, the high-frequency conversion device is controlled to be switched to the second Boost mode;
when the input voltage VinClose to Vo，VinGreater than Vo-VdAnd is less than Vo+VdIn which V isdControlling the high-frequency conversion device to be switched to a Buck-Boost mode when the low voltage constant is a small voltage constant;
when the input voltage VinGreater than Vo+VdWhen the high-frequency conversion device is in the Buck working mode, the high-frequency conversion device is controlled to be switched to the Buck working mode;
when the input voltage VinGreater than Vo+VdAnd gradually decrease to less than VoAt the time of/2, the high-frequency conversion device is controlled to be gradually switched to a first Boost mode from a Buck mode, wherein VdTo an adjustable setting, but less than Vo/2。
In the first Boost mode, the Buck circuit is closed, and only 2 interleaved three-level Boost modules M are connected in parallel2、M3Working to control the first three-level Boost module M2And a second three-level Boost module M3The switching tube in the middle can stagger the parallel three-level Boost module M in each quarter cycle2、M3Only one Boost circuit is conducted in the Boost circuit, and three-level Boost modules M connected in parallel are staggered in one period2、M3Conducting in a staggered way to form four boost circuits to charge one of the output capacitors;
in a second Boost mode, the Buck circuit is closed, and only 2 interleaved three-level Boost modules M are connected in parallel2、M3Operate to control the first three levelsBoost module M2And a second three-level Boost module M3The switching tube in the middle can stagger the parallel three-level Boost module M in each quarter cycle2、M3Only one Boost circuit is conducted in the Boost circuit, and three-level Boost modules M connected in parallel are staggered in one period2、M3Conducting in a staggered way to form four boost circuits to charge two output capacitors simultaneously;
in the Buck-Boost mode, the Buck module is conducted, and the Buck module and the Buck-Boost module work in the whole period;
in Buck mode, the interleaved parallel three-level Boost modules M are connected2、M3And when the Buck module does not work, the Buck module works in a whole period.
Preferably, the modes further include a protection mode, when the input end or the output end is in short circuit fault, the wide-range high-frequency direct current conversion device works in the protection mode, and the switch tube Q is in the protection mode1Breaking, first switch tube S1A second switch tube S2A third switching tube S3Fourth switch tube S4And (5) closing. At the moment, the inductive current does not flow through the input nor the output, and the function of short-circuit protection is realized by internal follow current.
Preferably, when the short-circuit fault is eliminated, the high-frequency conversion device is controlled to exit the protection mode according to the input voltage VinAnd an output voltage VoSwitches to the other four operating modes.
Preferably, in the first Boost mode, the second switch tube S is controlled for a first quarter cycle2On/off, the first switch tube S1Normally closed, third switching tube S3And a fourth switching tube S4Normally off; in the second quarter period, the third switch tube S is controlled3On/off, second switch tube S2Normally closed, first switching tube S1And a fourth switching tube S4Normally off; in the third quarter period, controlling a fourth switch tube S4On/off, third switch tube S3Normally closed, first switching tube S1And a second switching tube S2Normally off; in the fourth quarter-cycle period, the first,controlling a first switching tube S1On/off, fourth switch tube S4Normally closed, second switching tube S2And a third switching tube S3And (5) normally breaking.
Preferably, in the second boost mode, the first switch tube S is controlled for the first quarter period1On/off, second switch tube S2A third switching tube S3And a fourth switching tube S4Normally off; in the second quarter period, controlling the second switch tube S2On/off, the first switch tube S1A third switching tube S3And a fourth switching tube S4Normally off; in the third quarter period, controlling the third switch tube S3On/off, the first switch tube S1A second switch tube S2And a fourth switching tube S4Normally off; in the fourth quarter period, controlling a fourth switch tube S4On/off, the first switch tube S1A second switch tube S2And a third switching tube S3And (5) normally breaking.
The control mode can enable the converter to have the capability of operating in a wide input and output range by switching the working mode of the converter. When the converter is in a first Boost mode, a second Boost mode, a Buck-Boost mode and a Buck mode, the input and the output of the converter are in short-circuit fault, and the converter is switched to a protection mode; when the short-circuit fault is switched, the converter exits the protection mode according to the input voltage VinAnd an output voltage VoThe relationship of (c) is switched to the above four operation modes.
When the converter has an input and output short-circuit fault, the converter is switched to a protection mode. The above handover process is reversible. By switching the modes according to actual conditions, the converter can work in a wide input range, and meanwhile, the short-circuit fault protection of the input end and the output end can be realized.
The control method of the invention has the advantages that:
(1) the frequency of the inductor current is increased to 4 times of the switching frequency, so that the volume weight of the inductor is further reduced;
(2) zero current switching-on of the switching tube and zero reverse recovery current of the diode can be realized, the efficiency of the device is improved, and the EMI characteristic is improved;
(3) by switching the working modes, the adaptive range of the input and output voltages is expanded
(4) The current-limiting operation function during short circuit can be realized, and the safety of the direct-current power grid is improved.
(5) The input wide-range operation is realized, and the characteristics of high efficiency and high power density are achieved. The control method of the device is reasonably designed, the capability of the device is explored, and the function of the device is perfected, so that the device can cope with various working conditions.
Drawings
FIG. 1 is a main circuit diagram of a wide-range high-frequency DC converter;
FIG. 2 is a diagram illustrating the switching of the operation mode of the wide-range high-frequency DC converter;
fig. 3 is a first quarter cycle equivalent circuit diagram for the first Boost mode;
FIG. 4 is a second quarter cycle equivalent circuit diagram for the first Boost mode;
fig. 5 is a third quarter-cycle equivalent circuit diagram of the first Boost mode;
fig. 6 is a fourth quarter-cycle equivalent circuit diagram of the first Boost mode;
FIG. 7 is a fourth quarter cycle first phase equivalent circuit diagram of the first Boost mode;
FIG. 8 is a fourth quarter cycle second stage equivalent circuit diagram for the first Boost mode;
FIG. 9 is a fourth quarter cycle third stage equivalent circuit diagram for the first Boost mode;
fig. 10 is a first quarter cycle equivalent circuit diagram for the second Boost mode;
fig. 11 is a second quarter-cycle equivalent circuit diagram for the second Boost mode;
fig. 12 is a third quarter-cycle equivalent circuit diagram of the second Boost mode;
fig. 13 is a fourth quarter-cycle equivalent circuit diagram of the second Boost mode;
fig. 14 is a first quarter cycle first phase equivalent circuit diagram for the second Boost mode;
FIG. 15 is a first quarter cycle second stage equivalent circuit diagram for the second Boost mode;
fig. 16 is a first quarter cycle third stage equivalent circuit diagram of the second Boost mode;
FIG. 17 is a Buck-Boost mode first stage equivalent circuit diagram;
FIG. 18 is a Buck-Boost mode second stage equivalent circuit diagram;
FIG. 19 is a Buck mode first stage equivalent circuit diagram;
FIG. 20 is a Buck mode second stage equivalent circuit diagram;
FIG. 21 is a protection mode equivalent circuit diagram;
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Fig. 1 is a main circuit diagram of a wide-range high-frequency dc converter to which the present invention is applied. As shown in FIG. 1, the wide-range high-frequency DC conversion device comprises 1 Buck module M 12 coupled inductors L1、L 22 three-level Boost modules M2、M3And 2 supporting capacitors C1、C2。
As can be seen from FIG. 1, Buck module M1Comprising a switching tube Q1And diode QD1. DC input terminal VinIs connected to the switching tube Q1Collector electrode of (1), DC input terminal VinIs connected to the cathode of the diode QD1Anode of (2), diode QD1Cathode and switching tube Q1Are connected.
Each coupled inductor includes three connection terminals A, B, C, a diode QD1Cathode and coupling inductor L1Is connected to the A terminal of, diode QD1Anode and coupling inductor L2The A terminal of (1) is connected.
The 2 three-level Boost modules are M respectively2And M3，M2Comprises a first switch tube S1A second switch tube S2A first diode D1A second diode D2And M3Comprises a third switching tube S3And a fourth switching tube S4A third diode D3A fourth diode D4. Coupling inductor L1C terminal of the switch is connected with a first switch tube S1Collector and first diode D1Anode of (2), coupling inductor L2C terminal of the switch is connected with a second switch tube S2And a second diode D2A first switching tube S1Emitter and second switch tube S2Are connected to form a module M2Midpoint O endpoint of; coupling inductor L1The B terminal of the switch is connected with a third switch tube S3Collector and third diode D3Anode of (2), coupling inductor L2The terminal B is connected with a fourth switching tube S4And a fourth diode D4The third switching tube S3Emitter and fourth switching tube S4Are connected to form a module M3The midpoint O endpoint.
2 support capacitors C1、C2In series, C1And C is2Are connected to form the midpoint O terminal of the series capacitance. First diode D1A third diode D3And C1Is connected to the positive pole of (1) and is connected to the output VoThe positive electrode of (1) is connected; second diode D2A fourth diode D4With C and an anode of2Is connected with the negative electrode of the output Vo; module M2Midpoint O, module M3Are connected together with the midpoint O of the series capacitance to form a uniform midpoint O endpoint.
Fig. 2 is a schematic diagram of the mode switching process of the present invention. As can be seen from the figure, the present invention can be switched in a variety of modes. The switching of the individual modes can be regulated by control signals to the individual switching tubes.
When the input voltage V isinBelow the output voltage VoWhen the voltage is/2, controlling the high-frequency conversion device to work in a first Boost mode;
when the input voltage VinGreater than or equal to VoA/2 and less than VoWhen the high-frequency conversion device is in the Boost mode, the high-frequency conversion device is controlled to be switched to the second Boost mode;
when the input voltage VinClose to Vo(e.g., both less than a predetermined threshold), VinGreater than Vo-VdAnd is less than Vo+VdIn which V isdControlling the high-frequency conversion device to be switched to a Buck-Boost mode when the low voltage constant is a small voltage constant;
when the input voltage VinGreater than (or equal to) Vo+VdWhen the high-frequency conversion device is in the Buck working mode, the high-frequency conversion device is controlled to be switched to the Buck working mode;
when the input voltage VinGreater than Vo+VdAnd gradually decrease to less than VoAnd at the time of/2, controlling the high-frequency conversion device to gradually switch from the Buck mode to the first Boost mode.
Fig. 3-9 illustrate a first Boost mode. In the first Boost mode, the drive Q1 is normally closed, the Buck module is not operated, and only two three-level modules are operated. Fig. 3-6 show four equivalent operations in a cycle in the first Boost mode. In the operation of fig. 3, the second switching tube S2On/off, the first switch tube S1Normally closed, third switching tube S3And a fourth switching tube S4Normally-off, in the working process, the converter is equivalent to a Boost converter; in the operation of fig. 4, the third switch tube S3On/off, second switch tube S2Normally closed, first switching tube S1And a fourth switching tube S4Normally-off, in the working process, the converter is also equivalent to a Boost converter; in the operation of fig. 5, the fourth switching tube S4On/off, third switch tube S3Normally closed, first switching tube S1And a second switching tube S2Normally-off, in the working process, the converter is also equivalent to a Boost converter; in the operation of fig. 6, the first switching tube S1On/off, fourth switch tube S4Normally closed, second switching tube S2And a third switching tube S3Normally off, during which the converter is also equivalent to a Boost converter. The converter has four equivalent Boost working processes in one period, and each switch is switched on and off in one working process, so that the frequency of the inductive current is 4 times of the switching frequency. Specifically, the working process shown in fig. 6 is taken as an example for explanation. In fig. 7, a first switching tube S1A second switch tube S2A third switching tube S3Breaking, fourth switch tube S4Closed due to input voltage VinLess than the output voltage VoHalf of (a), current iL1The linearity decreases. In fig. 8, the second switching tube S2A third switching tube S3Open, first switch tube S1Fourth switch tube S4Is closed, at this stage, iL1k1By being equal to iL1Quickly falls to 0, iL1k1Rises from 0 to i rapidlyL1In this stage, S1Zero current switching-on is realized, switching loss is reduced, and the efficiency of the converter is improved. In fig. 9, the second switching tube S2A third switching tube S3Open, first switch tube S1Fourth switch tube S4Is closed at this time iL1k1Already 0, current iL1And (4) increasing linearly.
Fig. 10-16 show a second Boost mode. In the second Boost mode, the Q1 is normally closed, the Buck module is not operated, and only two three-level modules are operated. Fig. 10-13 show four equivalent operations in a cycle in the second Boost mode. In the operation of fig. 10, the first switching tube S1On/off, second switch tube S2A third switching tube S3And a fourth switching tube S4Normally-off, in the working process, the converter is equivalent to a Boost converter; in the operation of fig. 11, the second switching tube S2On/off, the first switch tube S1A third switching tube S3And a fourth switching tube S4Normally-off, in the working process, the converter is also equivalent to a Boost converter; in the operation of fig. 12, the third switching tube S3On/off, the first switch tube S1A second switch tube S2And a fourth switching tube S4Is normally off at this pointThe converter is also equivalent to a Boost converter in the working process; in the operation of fig. 13, the fourth switching tube S4On/off, the first switch tube S1A second switch tube S2And a third switching tube S3Normally off, the converter is also equivalent to a Boost converter during this operation. The converter has four equivalent Boost working processes in one period, and each switch is switched on and off in one working process, so that the frequency of the inductive current is 4 times of the switching frequency. Specifically, the operation process shown in fig. 10 is taken as an example for explanation. In fig. 14, a first switching tube S1A second switch tube S2A third switching tube S3Fourth switch tube S4Breaking, current iL1The linearity decreases. In fig. 15, the first switching tube S1Closed, the second switching tube S2A third switching tube S3Fourth switch tube S4Breaking, at this stage, iL1k1By being equal to iL1Quickly falls to 0, iL1k1Rises from 0 to i rapidlyL1In this stage, S1Zero current switching-on is realized. In fig. 16, the first switching tube S1Closed, the second switching tube S2A third switching tube S3Fourth switch tube S4Breaking, at this time iL1k1Is already 0, due to the input voltage VinGreater than the output voltage VoHalf of (a), current iL1And (4) increasing linearly.
Fig. 17-18 illustrate the Buck-Boost mode of operation. In the Buck-Boost mode, both the Buck module and the Buck-Boost module work. Switch tube Q1A first switch tube S1A second switch tube S2A third switching tube S3Fourth switch tube S4And simultaneously turning on and off, wherein the converter is equivalent to a Buck-Boost converter. Specifically, in fig. 17, the switching tube Q1A first switch tube S1A second switch tube S2A third switching tube S3Fourth switch tube S4Simultaneously turn on, current iL1The linearity decreases. In FIG. 18, a switching tube Q1A first switch tube S1A second switch tube S2A third switching tube S3Fourth switch tube S4Simultaneously turn off, current iL1And (4) increasing linearly.
Fig. 19-20 show the Buck mode of operation. In Buck mode, the first switch tube S1A second switch tube S2A third switching tube S3Fourth switch tube S4And the two three-level Boost converters do not work and only work by the Buck module, and the converter is equivalent to a Buck converter at the moment. Specifically, in fig. 19, the switching tube Q1Closed, current iL1And (4) increasing linearly. In FIG. 20, the switching tube Q1Off, current iL1The linearity decreases.
Fig. 21 shows a protection mode in which the wide-range high-frequency dc conversion device operates when the input terminal or the output terminal is short-circuited. In this operating mode, the switching tube Q1Breaking, first switch tube S1A second switch tube S2A third switching tube S3Fourth switch tube S4And (5) closing. At the moment, the inductive current does not flow through the input nor the output, the function of short-circuit protection is realized through internal follow current, and the normal working state is returned after the short circuit is cut off.
The present invention is not limited to the above embodiments, and those skilled in the art can implement the present invention in other various embodiments according to the disclosure of the embodiments and the drawings, and therefore, all designs that can be easily changed or modified by using the design structure and thought of the present invention fall within the protection scope of the present invention.

Claims (5)

1. A control method for a high-frequency DC converter comprising 1 Buck module M12 coupled inductors L1、L22 interleaved three-level Boost modules M2、M3And 2 supporting capacitors C1、C2Wherein the Buck module M1Two input ends of the high-frequency conversion device are used as the input of the high-frequency conversion device, two ends of the high-frequency conversion device after 2 supporting capacitors are connected in series are used as the output of the high-frequency conversion device,wherein the method comprises controlling the high frequency conversion device to switch between a plurality of modes, the modes comprising: a first Boost mode, a second Boost mode, a Buck-Boost mode and a Buck mode,
step (1) obtaining the Buck module M1Input voltage V ofinAnd the output voltage V of the high-frequency conversion deviceo；
Step (2) converting the input voltage VinAnd the output voltage VoComparing;
step (3) when the input voltage V isinBelow the output voltage VoWhen the voltage is/2, controlling the high-frequency conversion device to work in a first Boost mode;
when the input voltage VinGreater than or equal to VoA/2 and less than VoWhen the high-frequency conversion device is in the Boost mode, the high-frequency conversion device is controlled to be switched to the second Boost mode;
when the input voltage VinClose to Vo，VinGreater than Vo-VdAnd is less than Vo+VdIn which V isdControlling the high-frequency conversion device to be switched to a Buck-Boost mode when the low voltage constant is a small voltage constant;
when the input voltage VinGreater than Vo+VdWhen the high-frequency conversion device is in the Buck working mode, the high-frequency conversion device is controlled to be switched to the Buck working mode;
when the input voltage VinGreater than Vo+VdAnd gradually decrease to less than VoAt the time of/2, the high-frequency conversion device is controlled to be gradually switched to a first Boost mode from a Buck mode,
in the first Boost mode, the Buck circuit is closed, and only 2 interleaved three-level Boost modules M are connected in parallel2、M3Working to control the first three-level Boost module M2And a second three-level Boost module M3The switching tube in the middle can stagger the parallel three-level Boost module M in each quarter cycle2、M3Only one Boost circuit is conducted in the Boost circuit, and three-level Boost modules M connected in parallel are staggered in one period2、M3Are conducted in an interlaced way to form four boost circuit pair outputsOne of the capacitors is charged;
in a second Boost mode, the Buck circuit is closed, and only 2 interleaved three-level Boost modules M are connected in parallel2、M3Working to control the first three-level Boost module M2And a second three-level Boost module M3The switching tube in the middle can stagger the parallel three-level Boost module M in each quarter cycle2、M3Only one Boost circuit is conducted in the Boost circuit, and three-level Boost modules M connected in parallel are staggered in one period2、M3Conducting in a staggered way to form four boost circuits to charge two output capacitors simultaneously;
in the Buck-Boost mode, the Buck module is conducted, and the Buck module and the Buck-Boost module work in the whole period;
in Buck mode, the interleaved parallel three-level Boost modules M are connected2、M3And when the Buck module does not work, the Buck module works in a whole period.
2. The control method for a high-frequency inverter according to claim 1, wherein the modes further include a protection mode in which the wide-range high-frequency DC inverter operates in a protection mode when the input terminal or the output terminal is short-circuited, and the switching tube Q is turned on or off when the wide-range high-frequency DC inverter operates in the protection mode1Breaking, first switch tube S1A second switch tube S2A third switching tube S3Fourth switch tube S4And (5) closing. At the moment, the inductive current does not flow through the input nor the output, and the function of short-circuit protection is realized by internal follow current.
3. The control method for a high-frequency conversion apparatus according to claim 1, wherein when the short-circuit fault is eliminated, the high-frequency conversion apparatus is controlled to exit the protection mode in accordance with the input voltage VinAnd an output voltage VoSwitches to the other four operating modes.
4. The control method for a high-frequency conversion apparatus according to claim 1, wherein in the first Boost modeWherein, in the first quarter cycle, the second switch tube S is controlled2On/off, the first switch tube S1Normally closed, third switching tube S3And a fourth switching tube S4Normally off; in the second quarter period, the third switch tube S is controlled3On/off, second switch tube S2Normally closed, first switching tube S1And a fourth switching tube S4Normally off; in the third quarter period, controlling a fourth switch tube S4On/off, third switch tube S3Normally closed, first switching tube S1And a second switching tube S2Normally off; in the fourth quarter period, the first switch tube S is controlled1On/off, fourth switch tube S4Normally closed, second switching tube S2And a third switching tube S3And (5) normally breaking.
5. The control method for a high-frequency conversion apparatus according to claim 1,
in the second boost mode, the first switch tube S is controlled for the first quarter period1On/off, second switch tube S2A third switching tube S3And a fourth switching tube S4Normally off; in the second quarter period, controlling the second switch tube S2On/off, the first switch tube S1A third switching tube S3And a fourth switching tube S4Normally off; in the third quarter period, controlling the third switch tube S3On/off, the first switch tube S1A second switch tube S2And a fourth switching tube S4Normally off; in the fourth quarter period, controlling a fourth switch tube S4On/off, the first switch tube S1A second switch tube S2And a third switching tube S3And (5) normally breaking.
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