CN109004851A - A kind of space high-voltage high-frequency high-power alternating expression three-level PFC converter and method - Google Patents
A kind of space high-voltage high-frequency high-power alternating expression three-level PFC converter and method Download PDFInfo
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- CN109004851A CN109004851A CN201810896932.7A CN201810896932A CN109004851A CN 109004851 A CN109004851 A CN 109004851A CN 201810896932 A CN201810896932 A CN 201810896932A CN 109004851 A CN109004851 A CN 109004851A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/23—Conversion of ac power input into dc power output without possibility of reversal 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 arranged for operation in parallel
-
- 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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/25—Conversion of ac power input into dc power output without possibility of reversal 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 arranged for operation in series, e.g. for multiplication of voltage
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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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- Power Engineering (AREA)
- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of space high-voltage high-frequency high-power alternating expression three-level PFC converter and methods, include: four high-power fast recovery diodes, input filter capacitor C1, two boost inductances, four power switch tubes, three freewheeling diodes and two output capacitances；The circuit topology dexterously combines interleaved parallel PFC technology with three-level PFC technology, input current ripple after realizing crisscross parallel is smaller than the current ripples of the three-level PFC of single branch, branch current is approximately the half of input current, to reduce the current stress of switching device, and the voltage stress of each switching device also reduces half, strong technical support is provided for the research of high-power pfc converter, while improving input current Zero-crossing Distortion, the voltage and current stress and inductance volume of converter switches device are minimized.
Description
Technical field
The invention belongs to AC/DC to convert field, be specifically designed a kind of space high-voltage high-frequency high-power alternating expression three-level PFC
Converter and method.
Background technique
It is more severe for the design requirement of spacecraft power supply system as the difficulty of deep space exploration mission requirements continues to increase
It carves.Under the premise of guaranteeing the volume and weight of power-supply system defined, it is also necessary to power-supply system be made to realize highly reliable, high power
Density.To reduce power-supply system bus current and cable power loss, the distributed power supply system based on ac bus framework by
Gradually cause the concern of people.
Inevitably there is biggish harmonic wave interference, a large amount of harmonic wave electricity in the ac bus power-supply system of high voltagehigh frequency
Stream not only can bring very big difficulty to the design of power-supply system, also will affect the transfer efficiency and power supply product for reducing power-supply system
Matter.PFC (Power Factor Correction, PFC) converter is to realize input current by control circuit
Waveform strictly tracks input voltage waveform, to achieve the purpose that inhibit harmonic current, increase power factor.
With the raising of frequency, as shown in Figure 1, traditional pfc circuit includes: four high-power fast recovery diodes
D1, D2, D3, D4, input filter capacitor C1, two boost inductance L1, L2, two power switch tube Ss 1, S2, freewheeling diode
D5, D6, output capacitance C3 and load R；High-power fast recovery diode D1, D2, D3, D4 collectively constitute rectifier bridge.In tradition
Boost PFC circuit in, input current zero passage is distorted, and frequency is higher, distort it is more serious, to reduce the function of system
Rate factor；Meanwhile input current ripple is serious, and then leads to the increase of loss.And with the increase of power-supply system power, boosting
The switching device of pfc converter must bear excessively high voltage and current stress.
Interleaved parallel PFC technology can make converter be easier to work under continuous current mode conduction mode, Ke Yiyou
The rate of rise needed for effect ground reduces input current, the phenomenon that can be used for improving high mains frequency input current Zero-crossing Distortion.It hands over
Although the wrong increased inductive branch of topology in parallel plays the role of shunting, but the electricity that each branch switch device is born
Compression is still serious.For the volume for reducing inductance, inductance value can theoretically be further decreased, but the reduction of inductance is inevitable
It will increase current ripples.Moreover in practical applications, inductance cannot excessively reduce, the stabilization of whole system otherwise will affect
Property.
Summary of the invention
The purpose of the present invention is to propose to a kind of space high-voltage high-frequency high-power alternating expression three-level PFC converter and method,
Circuit topology dexterously combines interleaved parallel PFC technology with three-level PFC technology, the input electricity after realizing crisscross parallel
The current ripples of the three-level PFC of the single branch of flow liner Bobbi are smaller, and branch current is approximately the half of input current, to subtract
The small current stress of switching device, and the voltage stress of each switching device also reduces half, for high-power pfc converter
Research provide strong technical support.
In order to achieve the above object, the present invention provides a kind of changes of space high-voltage high-frequency high-power alternating expression three-level PFC
Parallel operation includes:
Collectively constitute several high-power fast recovery diodes of rectifier bridge, the friendship of the rectifier bridge and high voltagehigh frequency output
Galvanic electricity source is connected；
Input filter capacitor, it is in parallel with the rectifier bridge；
Four power switch tubes, the first power switch tube and the second power switch tube are connected the branch to be formed, with third function
Rate switching tube and the 4th the power switch tube branch to be formed of connecting are parallel with one another；
Two boost inductances, first the first side of boost inductance are connect with rectification bridge output end, second side and the first afterflow two
Pole pipe, the connection of third power switch tube；The output end of second the first side of boost inductance and rectifier bridge, input filter capacitor connection,
Second side is connect with the second freewheeling diode, the first power switch tube；
Two output capacitances, the first output capacitance branch to be formed of connecting with the second output capacitance are in parallel with output loading；
First output capacitance, first side is connect with the first freewheeling diode, the second freewheeling diode, and second side is opened with third power
Guan Guan, the connection of the 4th power switch tube；Second output capacitance, first side and the first power switch tube, the second power switch tube
Connection, second side are connect with third freewheeling diode；The third freewheeling diode is also connect with the 4th power switch tube.
Preferably, the first freewheeling diode cathode is connect with first the first side of output capacitance, the first freewheeling diode anode
It is connect with first boost inductance second side；Second freewheeling diode cathode is connect with first the first side of output capacitance, the second afterflow
Diode anode is connect with second boost inductance second side.
Preferably, the first power switch tube source electrode is connected with the drain electrode of the second power switch tube, the drain electrode of the first power switch tube
Connect with second boost inductance second side, the second power switch tube source electrode with publicly connect；Third power switch tube source electrode with
The drain electrode of 4th power switch tube is connected, and the drain electrode of third power switch tube is connect with described first boost inductance second side, the 4th function
Rate switching tube source electrode with publicly connect.
Preferably, first output capacitance second side and third power switch tube source electrode, the drain electrode of the 4th power switch tube connect；
Second the first side of output capacitance and the first power switch tube source electrode, the drain electrode of the second power switch tube connect, the second output capacitance the
Two sides are connected with third freewheeling diode anode, and third freewheeling diode cathode is connect with the 4th power switch tube source electrode.
Preferably, several described high-power fast recovery diodes are set as four high-power fast recovery diodes；
First high-power fast recovery diode and the high-power fast recovery diode of third are connected the branch to be formed, high-power with second
Fast recovery diode and the fourth-largest power the fast recovery diode branch to be formed of connecting are parallel with one another.
Preferably, first boost inductance is identical with the second boost inductance magnitude.
Preferably, first output capacitance is equal with the capacity of second output capacitance；First output capacitance
It is the half of output voltage with the second output capacitance voltage.
Preferably, the driving letter of the first power switch tube described in the driving signal delayed phase of the third power switch tube
Number T/4, the driving signal T/4 of third power switch tube described in the driving signal delayed phase of second power switch tube, institute
The driving signal T/4 of the second power switch tube described in the driving signal delayed phase of the 4th power switch tube is stated, wherein T represents one
A switch periods.
The present invention also provides a kind of using a kind of three level of space high-voltage high-frequency high-power alternating expression as described above
The control method of pfc converter, which includes:
When duty ratio >=0.5, which includes following procedure:
In first time period: the shutdown of third power switch tube, the first power switch tube, the second power switch tube, the 4th
Power switch tube is closed, and the electric current after rectification flows through the second boost inductance, the first power switch tube, the second power switch tube,
For the charging of the first boost inductance, the first boost inductor current rises；Electric current simultaneously flows through the second boost inductance, two pole of the first afterflow
Pipe, the first output capacitance, the second output capacitance and load, the decline of the second boost inductor current；
In second time period: enable third power switch tube be closed, the shutdown of the second power switch tube, the first boost inductance branch
Road electric current charges to the second output capacitance, and the first boost inductor current decline, the second boost inductor current rises；
In the third period: enable the second power switch tube be closed, the shutdown of the 4th power switch tube, the second boost inductance branch
Road working condition charges to the second output capacitance with the first time period, the first boost inductance branch current, the first boosting electricity
Inducing current rises, the decline of the second boost inductor current；
In four periods: enable the 4th power switch tube be closed, the shutdown of the first power switch tube, the second boost inductance branch
Road electric current charges to the first output capacitance, and the first boost inductance branch working condition is the same as the second time period, the first boosting electricity
Inducing current decline, the second boost inductor current rise.
Preferably, the control method of the space high-voltage high-frequency high-power alternating expression three-level PFC converter, further
Include:
As duty ratio < 0.5, which includes following procedure:
In first time period: only the first power switch tube conducting, the second power switch tube, third power switch tube,
4th power switch tube is turned off, and the second boost inductance branch current charges to the second output capacitance；The electricity of second boost inductance
Press VL2=Vin-1/2Vo, the rising of the second boost inductor current；The voltage V of first boost inductanceL1=Vin-Vo, the first boost inductance
Electric current decline；Wherein, VinFor rectified voltage, VoTo export DC voltage；
In second time period: only third power switch tube conducting, the voltage V of the second boost inductanceL2=Vin-Vo, the
The decline of two boost inductor currents；First boost inductance branch current charges to the second output capacitance, the voltage of the first boost inductance
VL1=Vin-1/2Vo, the rising of the first boost inductor current；
In the third period: the conducting of only the second power switch tube, the second boost inductance branch current are exported to first
Capacitor charging, the first boost inductance branch working condition is the same as the first time period；The decline of first boost inductor current, second liter
Piezoelectricity inducing current rises；
In four periods: the conducting of only the 4th power switch tube, the second boost inductance branch working condition is the same as described
Second time period, the first boost inductance branch current charge to the first output capacitance, and the first boost inductor current rises, and second liter
The decline of piezoelectricity inducing current.
Compared with prior art, the invention has the benefit that space high-voltage high-frequency high-power alternating expression three of the invention
The circuit topology of level PFC converter dexterously combines interleaved parallel PFC technology with three-level PFC technology, realizes friendship
Input current ripple after wrong parallel connection is smaller than the current ripples of the three-level PFC of single branch, and branch current is approximately input
The half of electric current, so that the current stress of switching device is reduced, and the voltage stress of each switching device also reduces half,
Strong technical support is provided for the research of high-power pfc converter.The present invention is improving input current Zero-crossing Distortion
Meanwhile minimizing the voltage and current stress and inductance volume of converter switches device.
Detailed description of the invention
The interleaved parallel PFC transformer configuration figure of Fig. 1 prior art；
Space high-voltage high-frequency high-power alternating expression three-level PFC transformer configuration figure Fig. 2 of the invention；
Fig. 3 the present invention in as duty ratio D >=0.5 alternating expression three-level PFC waveform；
Fig. 4 the present invention in as duty ratio D < 0.5 alternating expression three-level PFC waveform.
Specific embodiment
The present invention provides a kind of space high-voltage high-frequency high-power alternating expression three-level PFC converter and methods, in order to make
The present invention is more obvious and easy to understand, and below in conjunction with the drawings and specific embodiments, the present invention will be further described.
As shown in Fig. 2, space high-voltage high-frequency high-power alternating expression three-level PFC converter of the invention includes: four big
Power fast recovery diode D1, D2, D3, D4, input filter capacitor C1, two boost inductances L1, L2, four power switch tubes
S1, S2, S3, S4, sustained diode 5, D6, D7 and two output capacitances C2, C3.
High-power fast recovery diode D1, D2, D3, D4 collectively constitute rectifier bridge, high-power fast recovery diode D1
It connects the branch to be formed with high-power fast recovery diode D3, with high-power fast recovery diode D2 and high-power quickly extensive
The multiple diode D4 branch to be formed of connecting is parallel with one another.The rectification being made of high-power fast recovery diode D1, D2, D3, D4
Bridge is connected with the AC power source AC that high voltagehigh frequency exports, and the rectifier bridge is in parallel with input filter capacitor C1.
Boost inductance L1 and L2 magnitude is identical.
Output capacitance C2 connects with output capacitance C3, and the branch to be formed is in parallel with output loading R, and output capacitance C2 and C3 is equal
For large bulk capacitance, output capacitance C2 and C3 capacity is equal, and voltage is the half of output voltage.
The driving signal T/4 of the driving signal delayed phase power switch tube S 1 of power switch tube S 3, power switch tube S 2
Driving signal delayed phase power switch tube S 3 driving signal T/4, the driving signal delayed phase function of power switch tube S 4
The driving signal T/4 of rate switching tube S2, wherein T represents a switch periods.
The side inductance L1 is connected with rectification bridge output end, the anode of the other side and sustained diode 5, power switch tube S 3
Drain electrode be connected.The side inductance L2 is connected with the output end of rectifier bridge, input filter capacitor C1, the other side and sustained diode 6
Anode, power switch tube S 1 drain electrode be connected.
Power switch tube S 1 is connected the branch formed with power switch tube S 2, is connected with power S4 shape with power switch tube S 3
At branch it is parallel with one another.
Wherein, the source electrode of power switch tube S 1 is connected with the drain electrode of power switch tube S 2, the source electrode of power switch tube S 2 with
Publicly it is connected.The source electrode of power switch tube S 3 is connected with the drain electrode of power switch tube S 4, the source electrode and public affairs of power switch tube S 4
It is connected altogether.The output capacitance C2 branch to be formed of connecting with output capacitance C3 is in parallel with output loading R.Sustained diode 5 and continuous
The cathode of stream diode D6 is connected with the side output capacitance C2, the source of output capacitance C2 other side and power switch tube S 3
The drain electrode of pole, power switch tube S 4 is connected.The side output capacitance C3 is connected with the drain electrode of the source electrode of switching tube S1, switching tube S2,
The other side output capacitance C3 is connected with the anode of sustained diode 7, the cathode of sustained diode 7 and the source of power switch tube S 4
Extremely it is connected.
Sustained diode 7 of the invention is used for the afterflow when power switch tube S 3 and power switch tube S 4 disconnect, for output
Capacitor C2 and C3 charge.
As shown in figure 3, converter working condition is as follows as duty ratio D >=0.5:
(1)t0-t1Section: power switch tube S 3 turns off, and power switch tube S 1, S2, S4 are closed.Electric current after rectification flows through
Inductance L2, power switch tube S 1, power switch tube S 2 charge for inductance L1, and inductance L1 electric current rises.In addition, electric current flows simultaneously
Through inductance L2, sustained diode 5, output capacitance C2, output capacitance C3 and load R, the decline of inductance L2 electric current.
(2)t1-t2Section: power switch tube S 3 is closed, and power switch tube S 2 turns off, and inductance L1 branch current is to output capacitance
C3 charging, the decline of inductance L1 electric current, inductance L2 electric current rise.
(3)t2-t3Section: power switch tube S 2 is closed, and power switch tube S 4 turns off, the same t of inductance L2 branch working condition0-t1
Section, inductance L1 branch current charge to output capacitance C3, the same t of electric current slippage0-t1Section.
(4)t3-t4Section: power switch tube S 4 is closed, and power switch tube S 1 turns off, and inductance L2 branch current is to output capacitance
C2 charging, the same t of inductance L1 branch working condition1-t2Section, the same t of electric current slippage1-t2Section.
As shown in figure 4, converter working condition is as follows as duty ratio D < 0.5:
(1)t0-t1Section: only power switch tube S 1 is connected, and power switch tube S 2, S3, S4 are turned off, inductance L2 branch electricity
Stream charges to output capacitance C3；Inductance L2 voltage VL2=Vin-1/2Vo, the rising of inductance L2 electric current；Inductance L1 voltage VL1=Vin-
Vo, the decline of inductance L1 electric current.Wherein, VinFor rectified voltage, VoTo export DC voltage.
(2)t1-t2Section: only switching tube S3 conducting, inductance L2 voltage VL2=Vin-Vo, the decline of inductance L2 electric current；Inductance L1
Branch current charges to output capacitance C3, inductance L1 voltage VL1=Vin-1/2Vo, the rising of inductance L1 electric current.
(3)t2-t3Section: only power switch tube S 2 is connected, and inductance L2 branch current charges to output capacitance C2, inductance L2
The same t of electric current ascending amount0-t1Section；The same t of inductance L1 branch working condition0-t1Section.
(4)t3-t4Section: only power switch tube S 4 is connected, the same t of inductance L2 branch working condition1-t2Section；Inductance L1 branch
Electric current charges to output capacitance C2, the same t of inductance L1 electric current ascending amount1-t2Section.
In conclusion the circuit topology of space high-voltage high-frequency high-power alternating expression three-level PFC converter of the invention is skilful
Interleaved parallel PFC technology is combined with three-level PFC technology wonderfully, the input current ripple after realizing crisscross parallel is than single
The current ripples of the three-level PFC of a branch are smaller, and branch current is approximately the half of input current, to reduce derailing switch
The current stress of part, and the voltage stress of each switching device also reduces half, and the research of high-power pfc converter is mentioned
Strong technical support has been supplied to minimize the electricity of converter switches device also while improving input current Zero-crossing Distortion
Current voltage stress and inductance volume.
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a kind of space high-voltage high-frequency high-power alternating expression three-level PFC converter, characterized by comprising:
Collectively constitute several high-power fast recovery diodes of rectifier bridge, the alternating current of the rectifier bridge and high voltagehigh frequency output
Source (AC) is connected；
Input filter capacitor (C1), it is in parallel with the rectifier bridge；
The branch that four power switch tubes, the first power switch tube (S1) and the second power switch tube (S2) series connection are formed, with the
The branch that three power switch tubes (S3) and the series connection of the 4th power switch tube (S4) are formed is parallel with one another；
Two boost inductances, the first side of the first boost inductance (L1) are connect with rectification bridge output end, second side and the first afterflow two
Pole pipe (D5), third power switch tube (S3) connection；The output end of the first side of second boost inductance (L2) and rectifier bridge, input filter
Wave capacitor (C1) connection, second side are connect with the second freewheeling diode (D6), the first power switch tube (S1)；
Two output capacitances, the first output capacitance (C2) connect with the second output capacitance (C3) formed branch and output loading
(R) in parallel；First output capacitance (C2), first side and the first freewheeling diode (D5), the second freewheeling diode (D6) are even
It connects, second side is connect with third power switch tube (S3), the 4th power switch tube (S4)；Second output capacitance (C3) first
Side is connect with the first power switch tube (S1), the second power switch tube (S2), and second side is connect with third freewheeling diode (D7)；
The third freewheeling diode (D7) also connect with the 4th power switch tube (S4).
2. a kind of space high-voltage high-frequency high-power alternating expression three-level PFC converter as described in claim 1, feature exist
In,
First freewheeling diode (D5) cathode is connect with the first side of the first output capacitance (C2), the first freewheeling diode (D5) anode
It is connect with the first boost inductance (L1) second side；
Second freewheeling diode (D6) cathode is connect with the first side of the first output capacitance (C2), the second freewheeling diode (D6) anode
It is connect with the second boost inductance (L2) second side.
3. a kind of space high-voltage high-frequency high-power alternating expression three-level PFC converter as claimed in claim 2, feature exist
In,
First power switch tube (S1) source electrode is connected with the second power switch tube (S2) drain electrode, the first power switch tube (S1) drain electrode
Connect with the second boost inductance (L2) second side, the second power switch tube (S2) source electrode with publicly connect；
Third power switch tube (S3) source electrode is connected with the drain electrode of the 4th power switch tube (S4), third power switch tube (S3) drain electrode
Connect with described first boost inductance (L1) second side, the 4th power switch tube (S4) source electrode with publicly connect.
4. a kind of space high-voltage high-frequency high-power alternating expression three-level PFC converter as claimed in claim 1 or 3, feature
It is,
First output capacitance (C2) second side connects with third power switch tube (S3) source electrode, the drain electrode of the 4th power switch tube (S4)
It connects；
The first side of second output capacitance (C3) connects with the first power switch tube (S1) source electrode, the second power switch tube (S2) drain electrode
It connects, the second output capacitance (C3) second side is connected with third freewheeling diode (D7) anode, third freewheeling diode (D7) cathode
It is connect with the 4th power switch tube (S4) source electrode.
5. a kind of space high-voltage high-frequency high-power alternating expression three-level PFC converter as described in claim 1, feature exist
In,
Several described high-power fast recovery diodes are set as four high-power fast recovery diodes；
The branch that first high-power fast recovery diode (D1) and the high-power fast recovery diode of third (D3) series connection are formed,
Connect with the second high-power fast recovery diode (D2) and the fourth-largest power fast recovery diode (D4) formed branch phase
It is mutually in parallel.
6. a kind of space high-voltage high-frequency high-power alternating expression three-level PFC converter as described in claims 1 or 2 or 3, special
Sign is,
First boost inductance (L1) is identical with the second boost inductance (L2) magnitude.
7. a kind of space high-voltage high-frequency high-power alternating expression three-level PFC converter as described in claim 1, feature exist
In,
First output capacitance (C2) is equal with the capacity of second output capacitance (C3)；
First output capacitance (C2) and the second output capacitance (C3) voltage are the half of output voltage.
8. a kind of space high-voltage high-frequency high-power alternating expression three-level PFC converter as claimed in claim 1 or 3, feature
It is,
The driving signal of first power switch tube (S1) described in the driving signal delayed phase of the third power switch tube (S3)
T/4, the driving signal of third power switch tube (S3) described in the driving signal delayed phase of second power switch tube (S2)
T/4, the driving signal of the second power switch tube (S2) described in the driving signal delayed phase of the 4th power switch tube (S4)
T/4, wherein T represents a switch periods.
9. a kind of a kind of three level of space high-voltage high-frequency high-power alternating expression using as described in claim 1-8 any one
The control method of pfc converter, which is characterized in that the control method includes:
As duty ratio (D) >=0.5, which includes following procedure:
In first time period (t0-t1) when: third power switch tube (S3) shutdown, the first power switch tube (S1), the second power are opened
Pass pipe (S2), the 4th power switch tube (S4) are closed, and the electric current after rectification flows through the second boost inductance (L2), the first power is opened
Pipe (S1), the second power switch tube (S2) are closed, is charged for the first boost inductance (L1), the first boost inductance (L1) electric current rises；
Electric current simultaneously flows through the second boost inductance (L2), the first freewheeling diode (D5), the first output capacitance (C2), the second output capacitance
(C3) decline with load (R), the second boost inductance (L2) electric current；
In second time period (t1-t2) when: enable third power switch tube (S3) to be closed, the second power switch tube (S2) shutdown, first
Boost inductance (L1) branch current charges to the second output capacitance (C3), the decline of the first boost inductance (L1) electric current, the second boosting
Inductance (L2) electric current rises；
In third period (t2-t3) when: enable the second power switch tube (S2) to be closed, the shutdown of the 4th power switch tube (S4), second
Boost inductance (L2) branch working condition is with the first time period, and the first boost inductance (L1) branch current is to the second output electricity
Hold (C3) charging, the first boost inductance (L1) electric current rises, the decline of the second boost inductance (L2) electric current；
In the 4th period (t3-t4) when: enable the 4th power switch tube (S4) be closed, the first power switch tube (S1) shutdown, second
Boost inductance (L2) branch current charges to the first output capacitance (C2), and the first boost inductance (L1) branch working condition is the same as described
Second time period, the decline of the first boost inductance (L1) electric current, the second boost inductance (L2) electric current rise.
10. the control method of space high-voltage high-frequency high-power alternating expression three-level PFC converter as claimed in claim 9,
It is characterized in that, which further includes:
As duty ratio (D) < 0.5, which includes following procedure:
In first time period (t0-t1) when: only the first power switch tube (S1) conducting, the second power switch tube (S2), third function
Rate switching tube (S3), the 4th power switch tube (S4) are turned off, and the second boost inductance (L2) branch current is to the second output capacitance
(C3) it charges；The voltage V of second boost inductance (L2)L2=Vin-1/2Vo, the rising of the second boost inductance (L2) electric current；First boosting
The voltage V of inductance (L1)L1=Vin-Vo, the decline of the first boost inductance (L1) electric current；Wherein, VinFor rectified voltage, VoFor output
DC voltage；
In second time period (t1-t2) when: only third power switch tube (S3) conducting, the voltage V of the second boost inductance (L2)L2
=Vin-Vo, the decline of the second boost inductance (L2) electric current；First boost inductance (L1) branch current fills the second output capacitance (C3)
Electricity, the voltage V of the first boost inductance (L1)L1=Vin-1/2Vo, the rising of the first boost inductance (L1) electric current；
In third period (t2-t3) when: only the second power switch tube (S2) conducting, the second boost inductance (L2) branch current
It charges to the first output capacitance (C2), the first boost inductance (L1) branch working condition is the same as the first time period；First boosting
The decline of inductance (L1) electric current, the second boost inductance (L2) electric current rise；
In the 4th period (t3-t4) when: the conducting of only the 4th power switch tube (S4), the work of the second boost inductance (L2) branch
Situation charges to the first output capacitance (C2) with the second time period, the first boost inductance (L1) branch current, the first boosting
Inductance (L1) electric current rises, the decline of the second boost inductance (L2) electric current.
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