CN110912406B - 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 PDFInfo
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- CN110912406B CN110912406B CN201911132602.1A CN201911132602A CN110912406B CN 110912406 B CN110912406 B CN 110912406B CN 201911132602 A CN201911132602 A CN 201911132602A CN 110912406 B CN110912406 B CN 110912406B
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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
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- 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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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 the input wide-range operation is realized, the short-circuit current limiting function is realized, and the characteristics of high efficiency and high power density are realized. 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
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 arc and cut off, the direct-current conversion device needs 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, the dc conversion device is required to be efficient and high-density, thereby saving 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.
Buck and Boost circuits are one of the most common topological structures in a direct current conversion device, have the advantages of simple control, few switching devices and the like, and are 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 number of inductors used is doubled, 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 provides a control method for a high frequency dc conversion apparatus including 1 Buck module M 1 2 coupled inductors L 1 、L 2 2 interleaved three-level Boost modules M 2 、M 3 And 2 supporting capacitors C 1 、C 2 Wherein the Buck module M 1 Wherein two input terminals of the high frequency conversion device are used as input of the high frequency conversion device, and two ends of the high frequency conversion device after the 2 supporting capacitors are connected in series are used as output of the high frequency conversion device, and the method comprises controlling the high frequency conversion device to switch in a plurality of modes, wherein the modes comprise: a first Boost mode, a second Boost mode, a Buck-Boost mode and a Buck mode,
step (1) obtaining the Buck module M 1 Input voltage V of in And the output voltage V of the high-frequency conversion device o ；
Step (2) converting the input voltage V in And the output voltage V o Comparing;
step (3) when the input voltage V is in Lower than the output voltage V o When the voltage is/2, controlling the high-frequency conversion device to work in a first Boost mode;
when the input voltage V in Greater than V o A/2 and less than V o When the high-frequency conversion device is controlled to be switched to a second Boost mode;
when the input voltage V in Close to V o ，V in Greater than V o -V d And is less than V o +V d In which V is d Controlling 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 V in Greater than V o +V d When the high-frequency conversion device is controlled to be switched to a Buck working mode;
when the input voltage V in Greater than V o +V d And gradually decrease to less than V o At 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 V d To an adjustable setting, but less than V o /2。
In the first Boost mode, the Buck circuit is closed, and only 2 interleaved three-level Boost modules M are connected in parallel 2 、M 3 Working to control the first three-level Boost module M 2 And a second three-level Boost module M 3 The switching tube in the middle makes the three-level Boost module M connected in parallel be staggered every quarter cycle 2 、M 3 Only one Boost circuit is conducted in the Boost circuit, and three-level Boost modules M connected in parallel are staggered in one period 2 、M 3 Conducting in a staggered way to form four boost circuits to charge one of the output capacitors;
in the second Boost mode, the Buck circuit is closed, and only 2 interleaved three-level Boost modules M are used 2 、M 3 Working to control the first three-level Boost module M 2 And a second three-level Boost module M 3 The switching tube in the middle can stagger the parallel three-level Boost module M in each quarter cycle 2 、M 3 Only one Boost circuit is conducted in the three-level Boost module M, and the three-level Boost module M is connected in parallel in a staggered mode in one period 2 、M 3 Conducting 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 connected 2 、M 3 And when the Buck module does not work, the Buck module works in the whole period.
Preferably, the modes further include a protection mode in which the wide-range high-frequency dc converter device operates in the protection mode when the input terminal or the output terminal is short-circuitedUnder the formula, the switch tube Q at the time 1 Breaking, first switch tube S 1 A second switch tube S 2 Third switch tube S 3 Fourth switch tube S 4 And (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 V in And an output voltage V o Switches to the other four operating modes.
Preferably, in the first Boost mode, the second switch tube S is controlled for a first quarter cycle 2 On/off, the first switch tube S 1 Normally closed, third switching tube S 3 And a fourth switching tube S 4 Normally off; in the second quarter period, the third switch tube S is controlled 3 On/off, second switch tube S 2 Normally closed, first switching tube S 1 And a fourth switching tube S 4 Normally off; in the third quarter period, controlling the fourth switch tube S 4 On/off, third switch tube S 3 Normally closed, first switching tube S 1 And a second switch tube S 2 Normally off; in the fourth quarter period, the first switch tube S is controlled 1 On/off, fourth switch tube S 4 Normally closed, second switching tube S 2 And a third switching tube S 3 And (5) normally breaking.
Preferably, in the second boost mode, the first switch tube S is controlled for the first quarter period 1 On/off, second switch tube S 2 Third switch tube S 3 And a fourth switching tube S 4 Normally off; in the second quarter period, the second switch tube S is controlled 2 On/off, the first switch tube S 1 A third switching tube S 3 And a fourth switching tube S 4 Normally off; in the third quarter period, controlling the third switch tube S 3 On/off, the first switch tube S 1 A second switch tube S 2 And a fourth switching tube S 4 Normally off; in the fourth quarter period, controlling a fourth switching tube S 4 On-offFirst switch tube S 1 A second switch tube S 2 And a third switching tube S 3 And (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 V in And an output voltage V o The relationship of (c) is switched to the four operating modes described above.
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 voltage 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. By reasonably designing the control method of the device, 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 modes 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 of the first Boost mode;
fig. 10 is a first quarter cycle equivalent circuit diagram of 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 diagram of the equivalent circuit of the second stage of Buck mode;
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 1 2 coupled inductors L 1 、L 2 2 three-level Boost modules M 2 、M 3 And 2 supporting capacitors C 1 、C 2 。
As can be seen from FIG. 1, buck module M 1 Comprises a switch tube Q 1 And diode QD 1 . DC input terminal V in Is connected to the switching tube Q 1 Collector electrode of (1), DC input terminal V in Is connected to the cathode of the diode QD 1 Anode of (2), diode QD 1 Cathode of (2) and switch tube Q 1 Are connected.
Each coupling inductor comprises three connecting terminals A, B and C, and a diode QD 1 Cathode and coupling inductor L 1 Is connected to the A terminal of, diode QD 1 Anode and coupling inductor L 2 The A terminal of (1) is connected.
The 2 three-level Boost modules are M respectively 2 And M 3 ，M 2 Comprises a first switch tube S 1 A second switch tube S 2 A first diode D 1 A second diode D 2 And M 3 Comprising a third switching tube S 3 And a fourth switching tube S 4 A third diode D 3 A fourth diode D 4 . Coupling inductor L 1 C terminal of the switch is connected with a first switch tube S 1 Collector and first diode D 1 Anode of (2), coupling inductance L 2 C terminal of the switch is connected with a second switch tube S 2 And a second diode D 2 A first switching tube S 1 Emitter and second switch tube S 2 Collector connected to form a module M 2 The midpoint of (A); coupling inductor L 1 The B terminal of the switch is connected with a third switching tube S 3 Collector and third diode D 3 Anode of (2), coupling inductor L 2 The terminal B is connected with a fourth switching tube S 4 And a fourth diode D 4 Cathode of (2), third switching tubeS 3 Emitter and fourth switching tube S 4 Are connected to form a module M 3 The midpoint O of (a).
2 support capacitors C 1 、C 2 In series, C 1 And C is 2 Are connected to form the midpoint O terminal of the series capacitance. First diode D 1 A third diode D 3 And C 1 Is connected to the positive pole of (1) and is connected to the output V o The positive electrode of (1) is connected; second diode D 2 A fourth diode D 4 With C and an anode of 2 Is connected with the negative electrode of the output Vo; module M 2 Midpoint O, module M 3 Are 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 is in Below the output voltage V o When the voltage is/2, controlling the high-frequency conversion device to work in a first Boost mode;
when the input voltage V in Greater than or equal to V o A/2 and less than V o When 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 V in Close to V o (e.g., both less than a predetermined threshold), V in Greater than V o -V d And is less than V o +V d In which V is d Controlling 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 V in Greater than (or equal to) V o +V d When the high-frequency conversion device is controlled to be switched to a Buck working mode;
when the input voltage V in Greater than V o +V d And gradually decrease to less than V o And at the time of/2, controlling the high-frequency conversion device to gradually switch from the Buck mode to the first Boost mode.
FIGS. 3 to 9 showA first Boost mode is presented. In the first Boost mode, the driving Q1 is normally closed, the Buck module does not work, and only two three-level modules work. 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 S 2 On/off, the first switch tube S 1 Normally closed, third switching tube S 3 And a fourth switching tube S 4 Normally-off, in the working process, the converter is equivalent to a Boost converter; in the operation of fig. 4, the third switch tube S 3 On/off, second switch tube S 2 Normally closed, first switching tube S 1 And a fourth switching tube S 4 Normally-off, the converter is also equivalent to a Boost converter in the working process; in the operation of fig. 5, the fourth switching tube S 4 On/off, the third switching tube S 3 Normally closed, first switching tube S 1 And a second switching tube S 2 Normally-off, in the working process, the converter is also equivalent to a Boost converter; in the operation of fig. 6, the first switching tube S 1 On/off, fourth switch tube S 4 Normally closed, second switching tube S 2 And a third switching tube S 3 Normally 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 working process shown in fig. 6 is taken as an example for explanation. In fig. 7, a first switching tube S 1 Second switch tube S 2 A third switching tube S 3 Breaking, fourth switch tube S 4 Closed due to input voltage V in Less than the output voltage V o Half of (a), current i L1 The linearity decreases. In fig. 8, the second switching tube S 2 A third switching tube S 3 Breaking, first switch tube S 1 Fourth switch tube S 4 Is closed, at this stage, i L1k1 By being equal to i L1 Quickly drops to 0,i L1k1 Quickly rises from 0 to i L1 In this stage, S 1 Realize zero current switching on and reduceSwitching losses, the efficiency of the converter is improved. In fig. 9, the second switching tube S 2 A third switching tube S 3 Open, first switch tube S 1 Fourth switch tube S 4 Is closed at this time i L1k1 Already 0, current i L1 And (4) increasing linearly.
Fig. 10-16 show a second Boost mode. In the second Boost mode, Q1 is normally closed, the Buck module does not work, and only two three-level modules work. 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 S 1 On/off, second switch tube S 2 A third switching tube S 3 And a fourth switching tube S 4 Normally-off, the converter is equivalent to a Boost converter in the working process; in the operation of fig. 11, the second switching tube S 2 On/off, the first switch tube S 1 A third switching tube S 3 And a fourth switching tube S 4 Normally-off, the converter is also equivalent to a Boost converter in the working process; in the operation of fig. 12, the third switching tube S 3 On/off, the first switch tube S 1 Second switch tube S 2 And a fourth switching tube S 4 Normally-off, in the working process, the converter is also equivalent to a Boost converter; in the operation of fig. 13, the fourth switching tube S 4 On/off, the first switch tube S 1 A second switch tube S 2 And a third switching tube S 3 Normally 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 S 1 Second switch tube S 2 A third switching tube S 3 Fourth switch tube S 4 Breaking, current i L1 The linearity decreases. In fig. 15, a first switching tube S 1 Closed, the second switching tube S 2 Third switch tube S 3 Fourth switch tube S 4 Breaking, at this stage, i L1k1 By being equal to i L1 Quickly drops to 0,i L1k1 Quickly rises from 0 to i L1 In this stage, S 1 Zero current switching-on is realized. In fig. 16, the first switching tube S 1 Closed, the second switching tube S 2 A third switching tube S 3 Fourth switch tube S 4 Breaking, at this time i L1k1 Is already 0, due to the input voltage V in Greater than the output voltage V o Half of, current i L1 And (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 Q 1 First switch tube S 1 A second switch tube S 2 A third switching tube S 3 Fourth switch tube S 4 And simultaneously switching on and switching off, wherein the converter is equivalent to a Buck-Boost converter at the moment. Specifically, in fig. 17, the switching tube Q 1 A first switch tube S 1 A second switch tube S 2 A third switching tube S 3 Fourth switch tube S 4 Simultaneously turn on, current i L1 The linearity decreases. In fig. 18, a switching tube Q 1 First switch tube S 1 A second switch tube S 2 Third switch tube S 3 Fourth switch tube S 4 Simultaneously turn off, current i L1 And (4) increasing linearly.
Fig. 19-20 show the Buck mode of operation. In Buck mode, the first switch tube S 1 A second switch tube S 2 A third switching tube S 3 Fourth switch tube S 4 And when the three-level Boost converters are normally off, the two three-level Boost converters do not work, and only the Buck module works, so that the converters are equivalent to one Buck converter. Specifically, in fig. 19, the switching tube Q 1 Closed, current i L1 And (4) increasing linearly. In FIG. 20, the switching tube Q 1 Off, current i L1 The 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 Q 1 Breaking, first switchPipe S 1 A second switch tube S 2 A third switching tube S 3 Fourth switch tube S 4 And (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 by internal continuous 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 the designs and ideas of the present invention, which are made by some simple changes or modifications, fall into the protection scope of the present invention.
Claims (5)
1. A control method for a high-frequency conversion device comprising 1 Buck module M 1 2 coupled inductors L 1 、L 2 2 interleaved three-level Boost modules M 2 、M 3 And 2 supporting capacitors C 1 、C 2 Wherein the Buck module M 1 As 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 M 1 Input voltage V of in And the output voltage V of the high-frequency conversion device o ；
Step (2) converting the input voltage V in And the output voltage V o Comparing;
step (3) when the input voltage V is in Below the output voltage V o When the voltage is/2, controlling the high-frequency conversion device to work in a first Boost mode;
when the input voltage V in Greater than or equal to V o A/2 and less than V o When 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 V in Close to V o ，V in Greater than V o -V d And is less than V o +V d In which V is d Controlling 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 V in Greater than V o +V d When 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 V in Greater than V o +V d And gradually decrease to less than V o At 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 module is closed, and only 2 interleaved three-level Boost modules M are connected in parallel 2 、M 3 Working to control the first three-level Boost module M 2 And a second three-level Boost module M 3 The switching tube in the middle makes the three-level Boost module M connected in parallel be staggered every quarter cycle 2 、M 3 Only one Boost circuit is conducted in the Boost circuit, and three-level Boost modules M connected in parallel are staggered in one period 2 、M 3 Conducting in a staggered way to form four boost circuits to charge one of the output capacitors;
in the second Boost mode, the Buck module is closed, and only 2 interleaved three-level Boost modules M are connected in parallel 2 、M 3 Working to control the first three-level Boost module M 2 And a second three-level Boost module M 3 The switching tube in the middle can stagger the parallel three-level Boost module M in each quarter cycle 2 、M 3 Only one Boost circuit is conducted in the Boost circuit, and three-level Boost modules M connected in parallel are staggered in one period 2 、M 3 Conducting 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 connected 2 、M 3 Not workingAnd 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 converter operates in the protection mode when the input terminal or the output terminal is short-circuited and the switching tube Q is turned on 1 Breaking, first switch tube S 1 A second switch tube S 2 A third switching tube S 3 Fourth switch tube S 4 And when the circuit is closed, the inductive current does not flow through the input or the output, and the function of short-circuit protection is realized by internal continuous 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 V in And an output voltage V o Switches to the other four operating modes.
4. A control method for a high frequency conversion apparatus according to claim 2, wherein in said first Boost mode, said second switching tube S is controlled for a first quarter cycle 2 On/off, the first switch tube S 1 Normally closed, third switching tube S 3 And a fourth switching tube S 4 Normally off; in the second quarter period, the third switch tube S is controlled 3 On/off, second switch tube S 2 Normally closed, first switching tube S 1 And a fourth switching tube S 4 Normally off; in the third quarter period, controlling a fourth switch tube S 4 On/off, third switch tube S 3 Normally closed, first switching tube S 1 And a second switching tube S 2 Normally off; in the fourth quarter period, the first switch tube S is controlled 1 On/off, fourth switch tube S 4 Normally closed, second switching tube S 2 And a third switching tube S 3 And (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 period 1 On/off, second switch tube S 2 Third switch tube S 3 And a fourth switching tube S 4 Normally off; in the second quarter period, the second switch tube S is controlled 2 On/off, the first switch tube S 1 A third switching tube S 3 And a fourth switching tube S 4 Normally off; in the third quarter period, controlling the third switch tube S 3 On/off, the first switch tube S 1 A second switch tube S 2 And a fourth switching tube S 4 Normally off; in the fourth quarter period, controlling a fourth switch tube S 4 On/off, the first switch tube S 1 A second switch tube S 2 And a third switching tube S 3 And (5) normally breaking.
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