CN105846696A - Two-stage type AC-DC converter and control method thereof - Google Patents

Two-stage type AC-DC converter and control method thereof Download PDF

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CN105846696A
CN105846696A CN201610164808.2A CN201610164808A CN105846696A CN 105846696 A CN105846696 A CN 105846696A CN 201610164808 A CN201610164808 A CN 201610164808A CN 105846696 A CN105846696 A CN 105846696A
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output
diode
switching tube
filter capacitor
switch pipe
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CN105846696B (en
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吴红飞
韩蒙
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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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
    • 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
    • H02M1/4241—Arrangements for improving power factor of AC input using a resonant converter
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/008—Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators
    • 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
    • H02M1/0083—Converters characterised by their input or output configuration
    • H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs
    • 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)
  • Rectifiers (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a two-stage type AC-DC converter and a control method thereof and belongs to the power electronic converter technical field. The two-stage AC-DC converter is composed of a double-output PFC converter and two DCX circuits; the dual-output PFC converter provides voltage-constant high-voltage direct current output and voltage-variable low-voltage direct current output; the high-voltage direct current output and the low-voltage direct current output are respectively adopted as the inputs of the two DCX circuits; and the outputs of the two DCX circuits are connected in series and are connected with a load. According to the two-stage type AC-DC converter and the control method thereof of the invention, the voltage-variable low-voltage direct current output of the double-output PFC converter is utilized to directly realize wide-range regulation of the voltage of the load side, and therefore, the power loss of the PFC converter can be decreased, and the high-efficiency DCX circuits can be adopted at the later stage, and overall efficiency can be improved significantly. The two-stage type AC-DC converter and the control method thereof are especially suitable for AC-DC conversion conditions where load voltage varies substantially and have a high application value and a bright application prospect in fields such as the electric vehicle charging and energy storage field.

Description

A kind of two-stage type AC-DC converter and control method thereof
Technical field
The present invention relates to a kind of two-stage type AC-DC converter and control method thereof, belong to converters technical field, especially It belongs to AC-DC transformation of electrical energy technical field.
Background technology
Along with the extensive application of power electronic equipment, the harmonic current in electrical network is increasing, sets electrical network itself and other electricity consumptions For bringing a series of harm, such as relay protection and the misoperation of automaton, the mistake of instrument and meter is measured；Harmonic wave also can cause Added losses, cause transformator heating, cable aging.To this end, national governments and international body have formulated mandatory standard, Such as IEC 61000-302 Class D, limit Harmonics of Input and the power factor of changer.Two-stage type AC-DC converter Effective with its input current shaping, high reliability charges in Switching Power Supply, uninterrupted power supply, accumulator, remotely leads to Communication system is powered and is widely applied in the technical field such as hybrid vehicle.
Tradition two-stage type AC-DC converter prime typically use Boost circuit as pfc converter, in order to realize whole The interior regulation to input current of individual input voltage cycle, the output voltage of Boost circuit necessarily be greater than the peak value of input ac voltage. In order to adapt to wide output voltage range and voltage isolation application demand, the rear class of Boost pfc converter also need to use one-level every The output voltage of pfc converter is done conversion further with the demand adapting to load supplying by release DC-DC converter.Although Tradition two-stage type AC-DC converter is widely used in industrial quarters, but there is also following weak point: (1) is due to intermediate dc Busbar voltage is higher ranked, and the power device of prime pfc converter and rear class DC-DC converter all will bear higher electricity Compressive stress, and due to during switch motion the change in voltage at switching device two ends thus cause the switching loss of changer the most relatively greatly Greatly.(2) the AC ripple power of changer input all will carry out two-stage type conversion through pfc converter and DC-DC converter, The energy consumption causing system increases, thus reduces the whole efficiency of changer.(3) in the application scenario of load voltage width range, Rear class DC-DC converter must use the changer with wide gain, and the design difficulty of this quasi-converter is the most greatly and very Difficulty realizes the optimization of whole gain ranging internal efficiency.
In order to solve the problems referred to above, Chinese scholars proposes many solutions, as used soft switch technique, multilevel Device, single stage type pfc converter etc..Such as, document " Chen H, Liao J.Modified Interleaved Current Sensorless Control for Three-Level Boost PFC Converter with Considering Voltage Imbalance and Zero-Crossing Current Distortion [J] .IEEE Transactions on Industrial Electronics, 2015, 62 (11): 1-1. " use three level Boost pfc circuits with the service behaviour of Lifting Transform device.Document " P.Das, M. Pahlevaninezhad, G.Moschopoulos.Analysis and Design of a New AC-DC Single-Stage Full-Bridge PWM Converter With Two Controllers[J].IEEE Transactions on Industrial Electronics 2013,60 (11): 4930-4946. " use full-bridge converter to realize Single Stage PFC Converter, only use one-stage transfor-mation device to realize simultaneously PFC and the function of output voltage regulation, but Single Stage PFC Converter sacrifices power factor regulation ability or meeting is big Width increases the voltage stress of device, and its effect finally realized is compared two-stage type pfc converter and be there is no much improvement.Above-mentioned solution The pulsating power that changer is inputted by scheme still uses the mode being uniformly processed, and due to the periodicity on a large scale of input ac voltage Fluctuation, the mode of being uniformly processed cannot realize the power optimization of whole input voltage range.
Summary of the invention
It is an object of the invention to, for the deficiencies in the prior art, provide a kind of novel effective two for AC-DC transformation of electrical energy occasion Level formula AC-DC converter and control method thereof.
It is an object of the invention to be achieved through the following technical solutions:
Described two-stage type AC-DC converter is by single phase alternating current power supply (vAC) or three-phase alternating-current supply (vABC), dual output PFC Changer, a DCX circuit (DCX-1), the 2nd DCX circuit (DCX-2) and load (Ro) composition, wherein lose-lose Go out pfc converter and include that an ac voltage input, HVDC export (vH) and low-voltage direct output (vL)；Described list Cross streams power supply (vAC) or three-phase alternating-current supply (vABC) connect dual output pfc converter ac voltage input, lose-lose Go out the HVDC output (v of pfc converterH) connect a DCX circuit (DCX-1) input, dual output PFC Low-voltage direct output (the v of changerL) connect the 2nd DCX circuit (DCX-2) input, a DCX circuit (DCX-1) Output (vo1) and the output (v of the 2nd DCX circuit (DCX-2)o2) connect load (R after series connectiono) two ends.
The control method of described two-stage type AC-DC converter is, the HVDC output (v of dual output pfc converterH) (v is exported with low-voltage directL) voltage by dual output pfc converter control, the high-voltage dc transmission of dual output pfc converter Go out (vH) voltages keep constant and be consistently greater than equal to single phase alternating current power supply (vAC) or three-phase alternating-current supply (vABC) line electricity The peak value of pressure, the low-voltage direct output (v of dual output pfc converterL) voltage variable, and dual output pfc converter passes through Regulation low-voltage direct output (vL) voltage carry out steady load (Ro) voltage (v at two endso), a DCX circuit (DCX-1) Output (vo1) export (v with the HVDC of dual output pfc converter all the timeH) voltage keep fixed proportion, second Output (the v of DCX circuit (DCX-2)o2) export (v with the low-voltage direct of dual output pfc converter all the timeL) voltage protect Hold fixed proportion.In order to realize this purpose, a described DCX circuit (DCX-1) and the 2nd DCX circuit (DCX-2) Have in following topological structure any one: series resonant circuit, antiresonant circuit, half-bridge logical link control (LLC) resonant circuit, full-bridge LLC resonance circuit and phase whole-bridging circuit.
Described dual output Single-phase PFC changer uses any one in following ten kinds of schemes.
Scheme one: described dual output pfc converter is by rectifier bridge, boost inductance (Lb), the first switching tube (S1), second open Close pipe (S2), the first diode (D1), the second diode (D2), the first output filter capacitor (C1) and the second output filtering Electric capacity (C2) composition；
The ac voltage input of described rectifier bridge and single phase alternating current power supply (vAC) be connected, rectifier bridge output voltage (vDC) Anode is connected in boost inductance (Lb) one end, boost inductance (Lb) the other end be connected in second switch pipe (S2) drain electrode and Two diode (D2) anode, the second diode (D2) negative electrode be connected in the second output filter capacitor (C2) one end, i.e. HVDC output (vH) anode, second switch pipe (S2) source electrode be connected in the first switching tube (S1) drain electrode, first defeated Go out filter capacitor (C1) one end, i.e. low-voltage direct output (vL) anode and the second output filter capacitor (C2) another End, the first switching tube (S1) source electrode be connected in rectifier bridge output voltage (vDC) negative terminal and the first diode (D1) negative electrode, First diode (D1) anode be connected in the first output filter capacitor (C1) the other end, i.e. HVDC output (vH) and Low-voltage direct output (vL) public negative terminal.
Scheme two: described dual output pfc converter is by rectifier bridge, boost inductance (Lb), the first switching tube (S1), second open Close pipe (S2), the first diode (D1), the second diode (D2), the first output filter capacitor (C1) and the second output filtering Electric capacity (C2) composition；
The ac voltage input of described rectifier bridge and single phase alternating current power supply (vAC) be connected, rectifier bridge output voltage (vDC) Anode is connected in boost inductance (Lb) one end, boost inductance (Lb) the other end be connected in second switch pipe (S2) drain electrode and Two diode (D2) anode, the second diode (D2) negative electrode be connected in the second output filter capacitor (C2) one end, i.e. HVDC output (vH) anode, second switch pipe (S2) source electrode be connected in the first switching tube (S1) drain electrode and the one or two Pole pipe (D1) anode, the first diode (D1) negative electrode be connected in the first output filter capacitor (C1) one end, i.e. low pressure Direct current output (vL) anode, the first switching tube (S1) source electrode be connected in the first output filter capacitor (C1) the other end, i.e. Low-voltage direct output (vL) negative terminal, the second output filter capacitor (C2) the other end, i.e. HVDC output (vH) negative End and rectifier bridge output voltage (vDC) negative terminal.
Scheme three: described dual output pfc converter is by rectifier bridge, boost inductance (Lb), the first switching tube (S1), second open Close pipe (S2), the first diode (D1), the second diode (D2), the first output filter capacitor (C1) and the second output filtering Electric capacity (C2) composition；
The ac voltage input of described rectifier bridge and single phase alternating current power supply (vAC) be connected, rectifier bridge output voltage (vDC) Anode is connected in boost inductance (Lb) one end, boost inductance (Lb) the other end be connected in the first switching tube (S1) drain electrode, One diode (D1) anode and the second diode (D2) anode, the second diode (D2) negative electrode be connected in the second output Filter capacitor (C2) one end, i.e. HVDC output (vH) anode, the first diode (D1) negative electrode be connected in second Switching tube (S2) drain electrode, second switch pipe (S2) source electrode be connected in the first output filter capacitor (C1) one end, the lowest Straightening stream output (vL) anode and the second output filter capacitor (C2) the other end, the first switching tube (S1) source electrode be connected in First output filter capacitor (C1) the other end, i.e. HVDC output (vH) and low-voltage direct output (vL) public negative End and rectifier bridge output voltage (vDC) negative terminal.
Scheme four: described dual output pfc converter is by boost inductance (Lb), the first switching tube (S1), second switch pipe (S2)、 3rd switching tube (S3), the first diode (D1), the second diode (D2), the 3rd diode (D3), first output filtering Electric capacity (C1) and the second output filter capacitor (C2) composition；
Described boost inductance (Lb) one end be connected in single phase alternating current power supply (vAC) one end, boost inductance (Lb) the other end It is connected in the first switching tube (S1) drain electrode and second switch pipe (S2) source electrode, second switch pipe (S2) drain electrode be connected in second Diode (D2) negative electrode, the 3rd diode (D3) anode and the (S of the 3rd switching tube3) drain electrode, the 3rd switching tube (S3) Source electrode be connected in the first output filter capacitor (C1) one end, i.e. low-voltage direct output (vL) anode, the 3rd diode (D3) Negative electrode be connected in the second output filter capacitor (C2) one end, i.e. HVDC output (vH) anode, the first switching tube (S1) Source electrode be connected in the first output filter capacitor (C1) the other end, i.e. low-voltage direct output (vL) negative terminal, second output filter Ripple electric capacity (C2) the other end, i.e. HVDC output (vH) negative terminal and the first diode (D1) anode, the one or two Pole pipe (D1) negative electrode be connected in the second diode (D2) anode and single phase alternating current power supply (vAC) the other end.
Scheme five: described dual output pfc converter is by boost inductance (Lb), the first switching tube (S1), second switch pipe (S2)、 3rd switching tube (S3), the first diode (D1), the second diode (D2), the 3rd diode (D3), the 4th diode (D4)、 First output filter capacitor (C1) and the second output filter capacitor (C2) composition；
Described boost inductance (Lb) one end be connected in single phase alternating current power supply (vAC) one end, boost inductance (Lb) the other end It is connected in the first switching tube (S1) drain electrode, second switch pipe (S2) source electrode and the 4th diode (D4) anode, second Switching tube (S2) drain electrode be connected in the second diode (D2) negative electrode and the second output filter capacitor (C2) one end, the highest Straightening stream output (vH) anode, the 4th diode (D4) negative electrode be connected in the 3rd diode (D3) negative electrode and the 3rd open Close pipe (S3) drain electrode, the 3rd switching tube (S3) source electrode be connected in the first output filter capacitor (C1) one end, i.e. low pressure Direct current output (vL) anode, the first switching tube (S1) source electrode be connected in the first output filter capacitor (C1) the other end, i.e. Low-voltage direct output (vL) negative terminal, the second output filter capacitor (C2) the other end, i.e. HVDC output (vH) Negative terminal and the first diode (D1) anode, the first diode (D1) negative electrode be connected in the second diode (D2) anode, 3rd diode (D3) anode and single phase alternating current power supply (vAC) the other end.
Scheme six: described dual output pfc converter is by the first boost inductance (Lb1), the second boost inductance (Lb2), first open Close pipe (S1), second switch pipe (S2), the 3rd switching tube (S3), the first diode (D1), the second diode (D2), Three diode (D3), the 4th diode (D4), the 5th diode (D5), the first output filter capacitor (C1) and second defeated Go out filter capacitor (C2) composition；
Described first boost inductance (Lb1) one end be connected in the first switching tube (S1) drain electrode and the 3rd diode (D3) sun Pole, the second boost inductance (Lb2) one end be connected in second switch pipe (S2) drain electrode and the 4th diode (D4) anode, 4th diode (D4) negative electrode be connected in the 3rd diode (D3) negative electrode, the 5th diode (D5) anode and the 3rd open Close pipe (S3) drain electrode, the 3rd switching tube (S3) source electrode be connected in the first output filter capacitor (C1) one end, i.e. low pressure Direct current output (vL) anode, the 5th diode (D5) negative electrode be connected in the second output filter capacitor (C2) one end, i.e. HVDC output (vH) anode, the second output filter capacitor (C2) the other end, i.e. HVDC output (vH) Negative terminal is connected in the first output filter capacitor (C1) the other end, i.e. low-voltage direct output (vL) negative terminal, the first switching tube (S1) Source electrode, second switch pipe (S2) source electrode, the first diode (D1) anode and the second diode (D2) anode, Second diode (D2) negative electrode be connected in the first boost inductance (Lb1) the other end and single phase alternating current power supply (vAC) one end, Single phase alternating current power supply (vAC) the other end be connected in the second boost inductance (Lb2) the other end and the first diode (D1) negative electrode.
Scheme seven:
Described dual output pfc converter is by the first boost inductance (Lb1), the second boost inductance (Lb2), the first switching tube (S1)、 Second switch pipe (S2), the 3rd switching tube (S3), the 4th switching tube (S4), the first diode (D1), the second diode (D2)、 3rd diode (D3), the 4th diode (D4), the 5th diode (D5), the 6th diode (D6), first output filtering Electric capacity (C1) and the second output filter capacitor (C2) composition；
Described first boost inductance (Lb1) one end be connected in the first switching tube (S1) drain electrode and the 5th diode (D5) sun Pole, the second boost inductance (Lb2) one end be connected in the 3rd switching tube (S3) drain electrode and the 6th diode (D6) anode, First switching tube (S1) source electrode be connected in the 3rd diode (D3) anode and second switch pipe (S2) drain electrode, the 3rd opens Close pipe (S3) source electrode be connected in the 4th switching tube (D4) anode and the 4th switching tube (S4) drain electrode, the 5th diode (D5) Negative electrode be connected in the 6th diode (D6) negative electrode and the second output filter capacitor (C2) one end, i.e. HVDC output (vH) Anode, the 3rd diode (D3) negative electrode be connected in the 4th diode (D4) negative electrode and the first output filter capacitor (C1) One end, i.e. low-voltage direct output (vL) anode, the first output filter capacitor (C1) the other end, i.e. low-voltage DC Pressure output (vL) negative terminal be connected in the second output filter capacitor (C2) the other end, i.e. HVDC output (vH) negative terminal, Second switch pipe (S2) source electrode, the 4th switching tube (S4) source electrode, the first diode (D1) anode and the two or two pole Pipe (D2) anode, the second diode (D2) negative electrode be connected in the first boost inductance (Lb1) the other end and single-phase alternating current Source (vAC) one end, single phase alternating current power supply (vAC) the other end be connected in the second boost inductance (Lb2) the other end and first Diode (D1) negative electrode.
Scheme eight: described dual output pfc converter is by boost inductance (Lb), the first switching tube (S1), second switch pipe (S2)、 3rd switching tube (S3), the first diode (D1), the second diode (D2), the 3rd diode (D3), first output filtering Electric capacity (C1) and the second output filter capacitor (C2) composition；
Described boost inductance (Lb) one end be connected in the first switching tube (S1) drain electrode and the first diode (D1) anode, First diode (D1) negative electrode be connected in the second diode (D2) negative electrode, the 3rd switching tube (S3) drain electrode and the three or two Pole pipe (D3) anode, the 3rd diode (D3) negative electrode be connected in the second output filter capacitor (C2) one end, i.e. high pressure Direct current output (vH) anode, the 3rd switching tube (S3) source electrode be connected in the first output filter capacitor (C1) one end, i.e. Low-voltage direct output (vL) anode and the second output filter capacitor (C2) the other end, the first output filter capacitor (C1) The other end, i.e. HVDC output (vH) and low-voltage direct output (vL) public negative terminal be connected in the first switching tube (S1) Source electrode and second switch pipe (S2) source electrode, second switch pipe (S2) drain electrode be connected in the second diode (D2) anode and Single phase alternating current power supply (vAC) one end, single phase alternating current power supply (vAC) the other end be connected in boost inductance (Lb) the other end.
Scheme nine: described dual output pfc converter is by the first boost inductance (Lb1), the second boost inductance (Lb2), first open Close pipe (S1), second switch pipe (S2), the 3rd switching tube (S3), the 4th switching tube (S4), the first low tension switch pipe (SL1)、 Second low tension switch pipe (SL2), the 3rd low tension switch pipe (SL3), the 4th low tension switch pipe (SL4), the first output filter capacitor (C1) and the second output filter capacitor (C2) composition；
Described first boost inductance (Lb1) one end be connected in the 3rd switching tube (S3) source electrode, the 4th switching tube (S4) leakage Pole and the first low tension switch pipe (SL1) source electrode, the second boost inductance (Lb2) one end be connected in second switch pipe (S2) leakage Pole, the first switching tube (S1) source electrode and the 3rd low tension switch pipe (SL3) source electrode, the first switching tube (S1) drain electrode even In the 3rd switching tube (S3) drain electrode and the second output filter capacitor (C2) one end, i.e. HVDC output (vH) just End, the first low tension switch pipe (SL1) drain electrode be connected in the second low tension switch pipe (SL2) drain electrode, the 3rd low tension switch pipe (SL3) Drain electrode be connected in the 4th low tension switch pipe (SL4) drain electrode, the 4th low tension switch pipe (SL4) source electrode be connected in the second low tension switch Pipe (SL2) source electrode and the first output filter capacitor (C1) one end, i.e. low-voltage dc voltage output (vL) anode, One output filter capacitor (C1) the other end, i.e. low-voltage direct output (vL) negative terminal be connected in the second output filter capacitor (C2) The other end, i.e. HVDC output (vH) negative terminal, second switch pipe (S2) source electrode and the 4th switching tube (S4) source Pole, single phase alternating current power supply (vAC) one end be connected in the first boost inductance (Lb1) the other end, single phase alternating current power supply (vAC) The other end be connected in the second boost inductance (Lb2) the other end.
Scheme ten: described dual output pfc converter is by A phase boost inductance (LA), B phase boost inductance (LB), C phase boosts Inductance (LC), the first switching tube (S1), second switch pipe (S2), the 3rd switching tube (S3), the 4th switching tube (S4), Five switching tube (S5), the 6th switching tube (S6), the first low tension switch pipe (SL1), the second low tension switch pipe (SL2), the 3rd low Compress switch pipe (SL3), the 4th low tension switch pipe (SL4), the 5th low tension switch pipe (SL5), the 6th low tension switch pipe (SL6)、 First output filter capacitor (C1) and the second output filter capacitor (C2) composition；
Described three-phase alternating-current supply (vABC) m end be connected in A phase boost inductance (LA) one end, three-phase alternating-current supply (vABC) N end be connected in B phase boost inductance (LB) one end, three-phase alternating-current supply (vABC) p end be connected in C phase boost inductance (LC) One end, A phase boost inductance (LA) the other end be connected in the 5th switching tube (S5) source electrode, the 6th switching tube (S6) leakage Pole and the first low tension switch pipe (SL1) source electrode, B phase boost inductance (LB) the other end be connected in the 3rd switching tube (S3) Source electrode, the 4th switching tube (S4) drain electrode and the 3rd low tension switch pipe (SL3) source electrode, C phase boost inductance (LC) another One end is connected in the first switching tube (S1) source electrode, second switch pipe (S2) drain electrode and the 5th low tension switch pipe (SL5) source Pole, the first switching tube (S1) drain electrode be connected in the 3rd switching tube (S3) drain electrode, the 5th switching tube (S5) drain electrode and second Output filter capacitor (C2) one end, i.e. HVDC output (vH) anode, the first low tension switch pipe (SL1) drain electrode It is connected in the second low tension switch pipe (SL2) drain electrode, the 3rd low tension switch pipe (SL3) drain electrode be connected in the 4th low tension switch pipe (SL4) Drain electrode, the 5th low tension switch pipe (SL5) drain electrode be connected in the 6th low tension switch pipe (SL6) drain electrode, the 6th low tension switch pipe (SL6) source electrode be connected in the 4th low tension switch pipe (SL4) source electrode, the second low tension switch pipe (SL2) source electrode and first output Filter capacitor (C1) one end, i.e. low-voltage direct output (vL) anode, the first output filter capacitor (C1) the other end, I.e. low-voltage direct output (vL) negative terminal be connected in the second output filter capacitor (C2) the other end, i.e. HVDC output (vH) Negative terminal, the 6th switching tube (S6) source electrode, the 4th switching tube (S4) source electrode and second switch pipe (S2) source electrode.
Technical solution of the present invention essential difference is in that with existing technical scheme, uses dual output pfc converter to provide two simultaneously Power flow also provides the HVDC output of voltage constant and the low-voltage direct output of voltage variable, and two-way DC voltage is defeated Going out and be all connected with high efficiency DCX circuit, the output series connection of two-way DCX circuit provides energy for load.At load voltage width The application scenario of range, high pressure port is used for providing changeless load voltage, and low-pressure port is used for realizing load electricity The regulation of the wide scope of pressure, thus avoid being widely varied and then power attenuation can being reduced of late-class circuit gain, it is substantially improved Whole efficiency.
Beneficial effect:
(1) dual output pfc converter can provide two power flow for ac input power, thus can to high input voltage and The power of low pressure input correspondence is separately optimized process, significantly reduces the power attenuation of pfc converter, improves efficiency；
(2) dual output pfc converter can effectively reduce the voltage stress of switching device, provides multiple electricity for filter inductance simultaneously Put down, change in voltage during reduction switch motion, reduction switching loss, be conducive to the volume of reduction wave filter, reduction to be lost, carry High efficiency；
(3) rear class DC converter is without possessing voltage regulation capability, and whole power are directly over high efficiency DCX processing of circuit, DCX can always work in best efficiency point, such that it is able to significantly reduce the power loss of DC converting one-level, improve efficiency；
(4) exported by the HVDC output of dual output pfc converter voltage constant and the low-voltage direct of voltage variable, permissible It is directly realized by load both end voltage width scope high efficiency regulation, is particularly suitable for exporting the application scenario of DC voltage width range.
Accompanying drawing explanation
Accompanying drawing 1 is two-stage type Single-phase AC-DC converters system construction drawing of the present invention；
Accompanying drawing 2 is two-stage type three-phase AC-DC converter system construction drawing of the present invention；
Accompanying drawing 3 is the schematic diagram of dual output pfc converter implementation one of the present invention；
Accompanying drawing 4 is the schematic diagram of dual output pfc converter implementation two of the present invention；
Accompanying drawing 5 is the schematic diagram of dual output pfc converter implementation three of the present invention；
Accompanying drawing 6 is the schematic diagram of dual output pfc converter implementation four of the present invention；
Accompanying drawing 7 is the schematic diagram of dual output pfc converter implementation five of the present invention；
Accompanying drawing 8 is the schematic diagram of dual output pfc converter implementation six of the present invention；
Accompanying drawing 9 is the schematic diagram of dual output pfc converter implementation seven of the present invention；
Accompanying drawing 10 is the schematic diagram of dual output pfc converter implementation eight of the present invention；
Accompanying drawing 11 is the schematic diagram of dual output pfc converter implementation nine of the present invention；
Accompanying drawing 12 is the schematic diagram of dual output pfc converter implementation ten of the present invention；
Accompanying drawing 13 is the specific embodiment of two-stage type AC-DC converter of the present invention；
Designation in the figures above: DCX-1 and DCX-2 is respectively the first and second DCX circuit, vACFor blow-up Stream power supply；vABCFor three-phase alternating-current supply；M, n and p are respectively three-phase alternating-current supply (vABC) m end, n end and p end； vDCOutput voltage for rectifier bridge；vHAnd vLIt is respectively high pressure and the low-voltage direct output of dual output pfc converter；LbFor rising Voltage inductance, Lb1And Lb2It is respectively the first and second boost inductances；LA, LBAnd LCBeing respectively A phase, B phase is boosted with C phase Inductance；S1、S2、S3、S4、S5And S6It is respectively the first, second, third, fourth, the 5th and the 6th switching tube；SL1、 SL2、SL3、SL4、SL5And SL6It is respectively the first, second, third, fourth, the 5th and the 6th low tension switch pipe；D1、D2、 D3、D4、D5And D6It is respectively the first, second, third, fourth, the 5th and the 6th diode；C1And C2It is respectively first With the second output filter capacitor；RoFor load；vo1It it is the output voltage of a DCX circuit (DCX-1)；vo2It is second The output voltage of DCX circuit (DCX-2)；voFor load (Ro) both end voltage；SP1、SP2、SP3、SP4、SP5And SP6 For switching tube；DS1、DS2、DS3、DS4、DS5、DS6、DS7And DS8For diode；T1For LLC resonant full bridge transformator； T2For LLC resonance oscillation semi-bridge transformator；NP1And NS1It is respectively LLC resonant full bridge transformator (T1) primary side winding and secondary Umber of turn；NP2And NS2It is respectively LLC resonance oscillation semi-bridge transformator (T2) primary side winding and the vice-side winding number of turn；Lr1With Lr2It is respectively the first and second resonant inductances；Cr1, Cr2It is respectively the first and second resonant capacitances；Lm1And Lm2It is respectively first With the second magnetizing inductance；Co1And Co2For electric capacity；iDCInput current for dual output pfc converter；
Detailed description of the invention
Below in conjunction with the accompanying drawings technical scheme is described in detail.
As shown in Figure 1, described two-stage type AC-DC converter is by single phase alternating current power supply (vAC), dual output pfc converter, Oneth DCX circuit (DCX-1), the 2nd DCX circuit (DCX-2) and load (Ro) composition, wherein dual output PFC Changer includes that an ac voltage input, HVDC export (vH) and low-voltage direct output (vL)；
Described single phase alternating current power supply (vAC) connect dual output pfc converter ac voltage input, dual output PFC convert HVDC output (the v of deviceH) connect the input of a DCX circuit (DCX-1), dual output pfc converter low Straightening stream output (vL) connect the input of the 2nd DCX circuit (DCX-2), a DCX circuit (DCX-1) defeated Go out (vo1) and the output (v of the 2nd DCX circuit (DCX-2)o2) connect load (R after series connectiono) two ends.
As shown in Figure 2, described two-stage type AC-DC converter is by three-phase alternating-current supply (vABC), dual output pfc converter, Oneth DCX circuit (DCX-1), the 2nd DCX circuit (DCX-2) and load (Ro) composition, wherein three-phase alternating-current supply (vABC) including m end, n end and p end, dual output pfc converter includes ac voltage input, a high-voltage dc transmission Go out (vH) and low-voltage direct output (vL)；
Described three-phase alternating-current supply (vABC) connect dual output pfc converter ac voltage input, dual output PFC convert HVDC output (the v of deviceH) connect the input of a DCX circuit (DCX-1), dual output pfc converter low Straightening stream output (vL) connect the input of the 2nd DCX circuit (DCX-2), a DCX circuit (DCX-1) defeated Go out (vo1) and the output (v of the 2nd DCX circuit (DCX-2)o2) connect load (R after series connectiono) two ends.
In the present invention, described dual output pfc converter topological structure can use any one in following ten kinds of implementations.
The circuit theory diagrams of implementation one are as shown in Figure 3: described dual output pfc converter is by rectifier bridge, boost inductance (Lb), the first switching tube (S1), second switch pipe (S2), the first diode (D1), the second diode (D2), first defeated Go out filter capacitor (C1) and the second output filter capacitor (C2) composition；
The ac voltage input of described rectifier bridge and single phase alternating current power supply (vAC) be connected, rectifier bridge output voltage (vDC) Anode is connected in boost inductance (Lb) one end, boost inductance (Lb) the other end be connected in second switch pipe (S2) drain electrode and Two diode (D2) anode, the second diode (D2) negative electrode be connected in the second output filter capacitor (C2) one end, i.e. HVDC output (vH) anode, second switch pipe (S2) source electrode be connected in the first switching tube (S1) drain electrode, first defeated Go out filter capacitor (C1) one end, i.e. low-voltage direct output (vL) anode and the second output filter capacitor (C2) another End, the first switching tube (S1) source electrode be connected in rectifier bridge output voltage (vDC) negative terminal and the first diode (D1) negative electrode, First diode (D1) anode be connected in the first output filter capacitor (C1) the other end, i.e. HVDC output (vH) and Low-voltage direct output (vL) public negative terminal.
The circuit theory diagrams of implementation two are as shown in Figure 4: described dual output pfc converter is by rectifier bridge, boost inductance (Lb), the first switching tube (S1), second switch pipe (S2), the first diode (D1), the second diode (D2), first defeated Go out filter capacitor (C1) and the second output filter capacitor (C2) composition；
The ac voltage input of described rectifier bridge and single phase alternating current power supply (vAC) be connected, rectifier bridge output voltage (vDC) Anode is connected in boost inductance (Lb) one end, boost inductance (Lb) the other end be connected in second switch pipe (S2) drain electrode and Two diode (D2) anode, the second diode (D2) negative electrode be connected in the second output filter capacitor (C2) one end, i.e. HVDC output (vH) anode, second switch pipe (S2) source electrode be connected in the first switching tube (S1) drain electrode and the one or two Pole pipe (D1) anode, the first diode (D1) negative electrode be connected in the first output filter capacitor (C1) one end, i.e. low pressure Direct current output (vL) anode, the first switching tube (S1) source electrode be connected in the first output filter capacitor (C1) the other end, i.e. Low-voltage direct output (vL) negative terminal, the second output filter capacitor (C2) the other end, i.e. HVDC output (vH) negative End and rectifier bridge output voltage (vDC) negative terminal.
As shown in Figure 5, described dual output pfc converter is by rectifier bridge, boost inductance for the circuit theory diagrams of implementation three (Lb), the first switching tube (S1), second switch pipe (S2), the first diode (D1), the second diode (D2), first defeated Go out filter capacitor (C1) and the second output filter capacitor (C2) composition；
The ac voltage input of described rectifier bridge and single phase alternating current power supply (vAC) be connected, rectifier bridge output voltage (vDC) Anode is connected in boost inductance (Lb) one end, boost inductance (Lb) the other end be connected in the first switching tube (S1) drain electrode, One diode (D1) anode and the second diode (D2) anode, the second diode (D2) negative electrode be connected in the second output Filter capacitor (C2) one end, i.e. HVDC output (vH) anode, the first diode (D1) negative electrode be connected in second Switching tube (S2) drain electrode, second switch pipe (S2) source electrode be connected in the first output filter capacitor (C1) one end, the lowest Straightening stream output (vL) anode and the second output filter capacitor (C2) the other end, the first switching tube (S1) source electrode be connected in First output filter capacitor (C1) the other end, i.e. HVDC output (vH) and low-voltage direct output (vL) public negative End and rectifier bridge output voltage (vDC) negative terminal.
The circuit theory diagrams of implementation four are as shown in Figure 6: described dual output pfc converter is by boost inductance (Lb), One switching tube (S1), second switch pipe (S2), the 3rd switching tube (S3), the first diode (D1), the second diode (D2)、 3rd diode (D3), the first output filter capacitor (C1) and the second output filter capacitor (C2) composition；
Described boost inductance (Lb) one end be connected in single phase alternating current power supply (vAC) one end, boost inductance (Lb) the other end It is connected in the first switching tube (S1) drain electrode and second switch pipe (S2) source electrode, second switch pipe (S2) drain electrode be connected in second Diode (D2) negative electrode, the 3rd diode (D3) anode and the (S of the 3rd switching tube3) drain electrode, the 3rd switching tube (S3) Source electrode be connected in the first output filter capacitor (C1) one end, i.e. low-voltage direct output (vL) anode, the 3rd diode (D3) Negative electrode be connected in the second output filter capacitor (C2) one end, i.e. HVDC output (vH) anode, the first switching tube (S1) Source electrode be connected in the first output filter capacitor (C1) the other end, i.e. low-voltage direct output (vL) negative terminal, second output filter Ripple electric capacity (C2) the other end, i.e. HVDC output (vH) negative terminal and the first diode (D1) anode, the one or two Pole pipe (D1) negative electrode be connected in the second diode (D2) anode and single phase alternating current power supply (vAC) the other end.
The circuit theory diagrams of implementation five are as shown in Figure 7: described dual output pfc converter is by boost inductance (Lb), One switching tube (S1), second switch pipe (S2), the 3rd switching tube (S3), the first diode (D1), the second diode (D2)、 3rd diode (D3), the 4th diode (D4), the first output filter capacitor (C1) and the second output filter capacitor (C2) Composition；
Described boost inductance (Lb) one end be connected in single phase alternating current power supply (vAC) one end, boost inductance (Lb) the other end It is connected in the first switching tube (S1) drain electrode, second switch pipe (S2) source electrode and the 4th diode (D4) anode, second Switching tube (S2) drain electrode be connected in the second diode (D2) negative electrode and the second output filter capacitor (C2) one end, the highest Straightening stream output (vH) anode, the 4th diode (D1) negative electrode be connected in the 3rd diode (D3) negative electrode and the 3rd open Close pipe (S3) drain electrode, the 3rd switching tube (S3) source electrode be connected in the first output filter capacitor (C1) one end, i.e. low pressure Direct current output (vL) anode, the first switching tube (S1) source electrode be connected in the first output filter capacitor (C1) the other end, i.e. Low-voltage direct output (vL) negative terminal, the second output filter capacitor (C2) the other end, i.e. HVDC output (vH) Negative terminal and the first diode (D1) anode, the first diode (D1) negative electrode be connected in the second diode (D2) anode, 3rd diode (D3) anode and single phase alternating current power supply (vAC) the other end.
The circuit theory diagrams of implementation six are as shown in Figure 8: described dual output pfc converter is by the first boost inductance (Lb1)、 Second boost inductance (Lb2), the first switching tube (S1), second switch pipe (S2), the 3rd switching tube (S3), the first diode (D1), the second diode (D2), the 3rd diode (D3), the 4th diode (D4), the 5th diode (D5), first Output filter capacitor (C1) and the second output filter capacitor (C2) composition；
Described first boost inductance (Lb1) one end be connected in the first switching tube (S1) drain electrode and the 3rd diode (D3) sun Pole, the second boost inductance (Lb2) one end be connected in second switch pipe (S2) drain electrode and the 4th diode (D4) anode, 4th diode (D4) negative electrode be connected in the 3rd diode (D3) negative electrode, the 5th diode (D5) anode and the 3rd open Close pipe (S3) drain electrode, the 3rd switching tube (S3) source electrode be connected in the first output filter capacitor (C1) one end, i.e. low pressure Direct current output (vL) anode, the 5th diode (D5) negative electrode be connected in the second output filter capacitor (C2) one end, i.e. HVDC output (vH) anode, the second output filter capacitor (C2) the other end, i.e. HVDC output (vH) Negative terminal is connected in the first output filter capacitor (C1) the other end, i.e. low-voltage direct output (vL) negative terminal, the first switching tube (S1) Source electrode, second switch pipe (S2) source electrode, the first diode (D1) anode and the second diode (D2) anode, Second diode (D2) negative electrode be connected in the first boost inductance (Lb1) the other end and single phase alternating current power supply (vAC) one end, Single phase alternating current power supply (vAC) the other end be connected in the second boost inductance (Lb2) the other end and the first diode (D1) negative electrode.
The circuit theory diagrams of implementation seven are as shown in Figure 9: described dual output pfc converter is by the first boost inductance (Lb1)、 Second boost inductance (Lb2), the first switching tube (S1), second switch pipe (S2), the 3rd switching tube (S3), the 4th switching tube (S4), the first diode (D1), the second diode (D2), the 3rd diode (D3), the 4th diode (D4), the five or two Pole pipe (D5), the 6th diode (D6), the first output filter capacitor (C1) and the second output filter capacitor (C2) composition；
Described first boost inductance (Lb1) one end be connected in the first switching tube (S1) drain electrode and the 5th diode (D5) sun Pole, the second boost inductance (Lb2) one end be connected in the 3rd switching tube (S3) drain electrode and the 6th diode (D6) anode, First switching tube (S1) source electrode be connected in the 3rd diode (D3) anode and second switch pipe (S2) drain electrode, the 3rd opens Close pipe (S3) source electrode be connected in the 4th switching tube (D4) anode and the 4th switching tube (S4) drain electrode, the 5th diode (D5) Negative electrode be connected in the 6th diode (D6) negative electrode and the second output filter capacitor (C2) one end, i.e. HVDC output (vH) Anode, the 3rd diode (D3) negative electrode be connected in the 4th diode (D4) negative electrode and the first output filter capacitor (C1) One end, i.e. low-voltage direct output (vL) anode, the first output filter capacitor (C1) the other end, i.e. low-voltage DC Pressure output (vL) negative terminal be connected in the second output filter capacitor (C2) the other end, i.e. HVDC output (vH) negative terminal, Second switch pipe (S2) source electrode, the 4th switching tube (S4) source electrode, the first diode (D1) anode and the two or two pole Pipe (D2) anode, the second diode (D2) negative electrode be connected in the first boost inductance (Lb1) the other end and single-phase alternating current Source (vAC) one end, single phase alternating current power supply (vAC) the other end be connected in the second boost inductance (Lb2) the other end and first Diode (D1) negative electrode.
The circuit theory diagrams of implementation eight are as shown in Figure 10: described dual output pfc converter is by boost inductance (Lb), One switching tube (S1), second switch pipe (S2), the 3rd switching tube (S3), the first diode (D1), the second diode (D2)、 3rd diode (D3), the first output filter capacitor (C1) and the second output filter capacitor (C2) composition；
Described boost inductance (Lb) one end be connected in the first switching tube (S1) drain electrode and the first diode (D1) anode, First diode (D1) negative electrode be connected in the second diode (D2) negative electrode, the 3rd switching tube (S3) drain electrode and the three or two Pole pipe (D3) anode, the 3rd diode (D3) negative electrode be connected in the second output filter capacitor (C2) one end, i.e. high pressure Direct current output (vH) anode, the 3rd switching tube (S3) source electrode be connected in the first output filter capacitor (C1) one end, i.e. Low-voltage direct output (vL) anode and the second output filter capacitor (C2) the other end, the first output filter capacitor (C1) The other end, i.e. HVDC output (vH) and low-voltage direct output (vL) public negative terminal be connected in the first switching tube (S1) Source electrode and second switch pipe (S2) source electrode, second switch pipe (S2) drain electrode be connected in the second diode (D2) anode and Single phase alternating current power supply (vAC) one end, single phase alternating current power supply (vAC) the other end be connected in boost inductance (Lb) the other end.
The circuit theory diagrams of implementation nine are as shown in Figure 11: described dual output pfc converter is by the first boost inductance (Lb1)、 Second boost inductance (Lb2), the first switching tube (S1), second switch pipe (S2), the 3rd switching tube (S3), the 4th switching tube (S4), the first low tension switch pipe (SL1), the second low tension switch pipe (SL2), the 3rd low tension switch pipe (SL3), the 4th low press off Close pipe (SL4), the first output filter capacitor (C1) and the second output filter capacitor (C2) composition；
Described first boost inductance (Lb1) one end be connected in the 3rd switching tube (S3) source electrode, the 4th switching tube (S4) leakage Pole and the first low tension switch pipe (SL1) source electrode, the second boost inductance (Lb2) one end be connected in second switch pipe (S2) leakage Pole, the first switching tube (S1) source electrode and the 3rd low tension switch pipe (SL3) source electrode, the first switching tube (S1) drain electrode even In the 3rd switching tube (S3) drain electrode and the second output filter capacitor (C2) one end, i.e. HVDC output (vH) just End, the first low tension switch pipe (SL1) drain electrode be connected in the second low tension switch pipe (SL2) drain electrode, the 3rd low tension switch pipe (SL3) Drain electrode be connected in the 4th low tension switch pipe (SL4) drain electrode, the 4th low tension switch pipe (SL4) source electrode be connected in the second low tension switch Pipe (SL2) source electrode and the first output filter capacitor (C1) one end, i.e. low-voltage dc voltage output (vL) anode, One output filter capacitor (C1) the other end, i.e. low-voltage direct output (vL) negative terminal be connected in the second output filter capacitor (C2) The other end, i.e. HVDC output (vH) negative terminal, second switch pipe (S2) source electrode and the 4th switching tube (S4) source Pole, single phase alternating current power supply (vAC) one end be connected in the first boost inductance (Lb1) the other end, single phase alternating current power supply (vAC) The other end be connected in the second boost inductance (Lb2) the other end.
The circuit theory diagrams of implementation ten are as shown in Figure 12: described dual output pfc converter is by A phase boost inductance (LA)、 B phase boost inductance (LB), C phase boost inductance (LC), the first switching tube (S1), second switch pipe (S2), the 3rd switching tube (S3), the 4th switching tube (S4), the 5th switching tube (S5), the 6th switching tube (S6), the first low tension switch pipe (SL1), Two low tension switch pipe (SL2), the 3rd low tension switch pipe (SL3), the 4th low tension switch pipe (SL4), the 5th low tension switch pipe (SL5)、 6th low tension switch pipe (SL6), the first output filter capacitor (C1) and the second output filter capacitor (C2) composition；
Described three-phase alternating-current supply (vABC) m end be connected in A phase boost inductance (LA) one end, three-phase alternating-current supply (vABC) N end be connected in B phase boost inductance (LB) one end, three-phase alternating-current supply (vABC) p end be connected in C phase boost inductance (LC) One end, A phase boost inductance (LA) the other end be connected in the 5th switching tube (S5) source electrode, the 6th switching tube (S6) leakage Pole and the first low tension switch pipe (SL1) source electrode, B phase boost inductance (LB) the other end be connected in the 3rd switching tube (S3) Source electrode, the 4th switching tube (S4) drain electrode and the 3rd low tension switch pipe (SL3) source electrode, C phase boost inductance (LC) another One end is connected in the first switching tube (S1) source electrode, second switch pipe (S2) drain electrode and the 5th low tension switch pipe (SL5) source Pole, the first switching tube (S1) drain electrode be connected in the 3rd switching tube (S3) drain electrode, the 5th switching tube (S5) drain electrode and second Output filter capacitor (C2) one end, i.e. HVDC output (vH) anode, the first low tension switch pipe (SL1) drain electrode It is connected in the second low tension switch pipe (SL2) drain electrode, the 3rd low tension switch pipe (SL3) drain electrode be connected in the 4th low tension switch pipe (SL4) Drain electrode, the 5th low tension switch pipe (SL5) drain electrode be connected in the 6th low tension switch pipe (SL6) drain electrode, the 6th low tension switch pipe (SL6) source electrode be connected in the 4th low tension switch pipe (SL4) source electrode, the second low tension switch pipe (SL2) source electrode and first output Filter capacitor (C1) one end, i.e. low-voltage direct output (vL) anode, the first output filter capacitor (C1) the other end, I.e. low-voltage direct output (vL) negative terminal be connected in the second output filter capacitor (C2) the other end, i.e. HVDC output (vH) Negative terminal, the 6th switching tube (S6) source electrode, the 4th switching tube (S4) source electrode and second switch pipe (S2) source electrode.
In above-mentioned implementation, the HVDC output (v of dual output pfc converterH) connect a DCX circuit (DCX-1) Input, dual output pfc converter low-voltage direct output (vL) connect the 2nd DCX circuit (DCX-2) input, Output (the v of the oneth DCX circuit (DCX-1)o1) and the output (v of the 2nd DCX circuit (DCX-2)o2) connect after series connection Meet load (Ro) two ends.In order to realize this purpose, described two-way DCX circuit can use has following topology knot Any one in structure: series resonant circuit, antiresonant circuit, half-bridge logical link control (LLC) resonant circuit, full-bridge LLC resonance circuit And phase whole-bridging circuit.
In above-mentioned implementation, the control method of two-stage type AC-DC converter of the present invention is: dual output PFC becomes HVDC output (the v of parallel operationH) and low-voltage direct output (vL) voltage by dual output pfc converter control, lose-lose Go out the HVDC output (v of pfc converterH) voltages keep constant and be consistently greater than equal to single phase alternating current power supply (vAC) or Three-phase alternating-current supply (vABC) peak value of line voltage, the low-voltage direct output (v of dual output pfc converterL) voltage variable, And dual output pfc converter is by regulation low-voltage direct output (vL) voltage carry out steady load (Ro) voltage (v at two endso), Output (the v of the oneth DCX circuit (DCX-1)o1) export (v with the HVDC of dual output pfc converter all the timeH) Voltage keeps fixed proportion, the output (v of the 2nd DCX circuit (DCX-2)o2) low with dual output pfc converter all the time Straightening stream output (vL) voltage keep fixed proportion.
Below in conjunction with specific embodiment, the present invention program and operation principle thereof are described further.
By dual output pfc converter dual output PFC in accompanying drawing 4 in accompanying drawing 1 two-stage type Single-phase AC-DC converters system The schematic diagram of changer implementation two replaces, and a DCX circuit and the 2nd DCX circuit to be respectively adopted LLC resonance complete Bridge circuit and LLC resonance half-bridge circuit, then can obtain dual output pfc converter and use the two-stage type AC-DC of embodiment two Changer system schematic diagram is as shown in Figure 13.
As shown in Figure 13, the HVDC output (v of dual output pfc converterH) it is used as the defeated of full-bridge LLC resonance circuit Enter, low-voltage direct output (vL) be used as half-bridge logical link control (LLC) resonant circuit input, the output of full-bridge LLC resonance circuit and half-bridge Energy is provided for load after the output series connection of LLC resonance circuit.Wherein, the HVDC output (v of dual output pfc converterH) (v is exported with low-voltage directL) voltage by dual output pfc converter, i.e. three level Boost dual output pfc converters control, And the HVDC output (v of dual output pfc converterH) voltage be consistently greater than equal to single phase alternating current power supply (vAC) peak value Voltage, the HVDC output (v of dual output pfc converterH) voltage all the time with a DCX circuit (DCX-1), i.e. Output (the v of full-bridge LLC resonance circuito1) voltage becomes fixed proportion and this ratio equal to full-bridge LLC resonance circuit input voltage The voltage ratio intrinsic with output voltage, it is full-bridge LLC resonance transformer (T1) turn ratio NP1/NS1, dual output PFC Low-voltage direct output (the v of changerL) voltage all the time with the 2nd DCX circuit (DCX-2), i.e. half-bridge logical link control (LLC) resonant circuit Output (vo2) voltage becomes fixed proportion and this ratio electricity intrinsic equal to half-bridge logical link control (LLC) resonant circuit input voltage and output voltage Pressure ratio example, it is half-bridge logical link control (LLC) resonant transformator (T2) turn ratio NP2/NS2Twice, the output of full-bridge LLC resonance circuit (vo1) voltage and the output (v of half-bridge logical link control (LLC) resonant circuito2) Voltage Series sum equal to load (Ro) both end voltage (vo)。
In order to realize this purpose, the control mode taking dual output pfc converter is: the high straightening of dual output pfc converter Stream output (vH) and input current (iDC) by using the dicyclo actuator of traditional outer voltage+current inner loop to be controlled, First switching tube (S1) and second switch pipe (S2) use and drive the interlock control mode of 180 ° of signal defeated at utmost to reduce Enter pulsation of current amount and output voltage ripple.In order to realize that dual output pfc converter low-voltage direct is exported (v simultaneouslyL) control System, at the first switching tube (S1) and second switch pipe (S2) dutycycle sum keep constant in the case of, increase second switch Pipe (S2) dutycycle (d2), reduce the first switching tube (S1) dutycycle (d1).First switching tube (S1) and second open Close pipe (S2) dutycycle be respectively d1=d-Δ d, d2=d+ Δ d, wherein d is that dual output pfc converter HVDC exports (vH) Actuator and input current (iDC) main duty cycle signals that actuator obtains, Δ d is that dual output pfc converter low-voltage direct is defeated Go out (vL) output signal of actuator.Circuit work remains that dual output pfc converter HVDC exports (vH) electricity Press constant, by regulation dual output pfc converter low-voltage direct output (vL) voltage realizes load voltage (vo) wide scope Change.
According to the description of operation principle above, the present invention can be defeated by the low-voltage direct of the voltage variable of dual output pfc converter Go out to be directly realized by the wide range of load voltage, and rear class uses high efficiency DCX circuit realiration electrical isolation, compared to biography System two-stage type scheme can be substantially improved the whole efficiency of two-stage type AC-DC converter, is particularly suitable for what load voltage significantly changed AC-DC transformation of electrical energy occasion.
The above is only the preferred embodiment of the present invention, it should be pointed out that: for those skilled in the art, Under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should be regarded as this Bright protection domain.

Claims (14)

1. a two-stage type AC-DC converter, it is characterised in that: described two-stage type AC-DC converter is by single-phase alternating current Source (vAC), dual output pfc converter, a DCX circuit (DCX-1), the 2nd DCX circuit (DCX-2) and negative Carry (Ro) composition, wherein dual output pfc converter includes that an ac voltage input, HVDC export (vH) and low Straightening stream output (vL)；
Described single phase alternating current power supply (vAC) connect dual output pfc converter ac voltage input, dual output PFC convert HVDC output (the v of deviceH) connect the input of a DCX circuit (DCX-1), dual output pfc converter low Straightening stream output (vL) connect the input of the 2nd DCX circuit (DCX-2), a DCX circuit (DCX-1) defeated Go out (vo1) and the output (v of the 2nd DCX circuit (DCX-2)o2) connect load (R after series connectiono) two ends.
2. a two-stage type AC-DC converter, it is characterised in that: described two-stage type AC-DC converter is by three-phase alternating current Source (vABC), dual output pfc converter, a DCX circuit (DCX-1), the 2nd DCX circuit (DCX-2) and negative Carry (Ro) composition, wherein three-phase alternating-current supply (vABC) including m end, n end and p end, dual output pfc converter includes One ac voltage input, HVDC output (vH) and low-voltage direct output (vL)；
Described three-phase alternating-current supply (vABC) connect dual output pfc converter ac voltage input, dual output PFC convert HVDC output (the v of deviceH) connect the input of a DCX circuit (DCX-1), dual output pfc converter low Straightening stream output (vL) connect the input of the 2nd DCX circuit (DCX-2), a DCX circuit (DCX-1) defeated Go out (vo1) and the output (v of the 2nd DCX circuit (DCX-2)o2) connect load (R after series connectiono) two ends.
3. according to the two-stage type AC-DC converter described in claim 1 and claim 2, it is characterised in that described first DCX circuit (DCX-1) and the 2nd DCX circuit (DCX-2) have any one in following topological structure: connect humorous Shake circuit, antiresonant circuit, half-bridge logical link control (LLC) resonant circuit, full-bridge LLC resonance circuit and phase whole-bridging circuit.
4. according to the control method of the two-stage type AC-DC converter described in claim 1 and claim 2, it is characterised in that HVDC output (the v of dual output pfc converterH) and low-voltage direct output (vL) voltage by dual output PFC convert Device controls, the HVDC output (v of dual output pfc converterH) voltages keep constant and be consistently greater than equal to single phase ac Power supply (vAC) or three-phase alternating-current supply (vABC) peak value of line voltage, the low-voltage direct output (v of dual output pfc converterL) Voltage variable, and dual output pfc converter by regulation low-voltage direct output (vL) voltage carry out steady load (Ro) two Voltage (the v of endo), the output (v of a DCX circuit (DCX-1)o1) all the time with the high straightening of dual output pfc converter Stream output (vH) voltage keep fixed proportion, the output (v of the 2nd DCX circuit (DCX-2)o2) all the time with dual output Low-voltage direct output (the v of pfc converterL) voltage keep fixed proportion.
Two-stage type AC-DC converter the most according to claim 1, it is characterised in that described dual output pfc converter By rectifier bridge, boost inductance (Lb), the first switching tube (S1), second switch pipe (S2), the first diode (D1), the two or two Pole pipe (D2), the first output filter capacitor (C1) and the second output filter capacitor (C2) composition；
The ac voltage input of described rectifier bridge and single phase alternating current power supply (vAC) be connected, rectifier bridge output voltage (vDC) Anode is connected in boost inductance (Lb) one end, boost inductance (Lb) the other end be connected in second switch pipe (S2) drain electrode and Two diode (D2) anode, the second diode (D2) negative electrode be connected in the second output filter capacitor (C2) one end, i.e. HVDC output (vH) anode, second switch pipe (S2) source electrode be connected in the first switching tube (S1) drain electrode, first defeated Go out filter capacitor (C1) one end, i.e. low-voltage direct output (vL) anode and the second output filter capacitor (C2) another End, the first switching tube (S1) source electrode be connected in rectifier bridge output voltage (vDC) negative terminal and the first diode (D1) negative electrode, First diode (D1) anode be connected in the first output filter capacitor (C1) the other end, i.e. HVDC output (vH) and Low-voltage direct output (vL) public negative terminal.
Two-stage type AC-DC converter the most according to claim 1, it is characterised in that described dual output pfc converter By rectifier bridge, boost inductance (Lb), the first switching tube (S1), second switch pipe (S2), the first diode (D1), the two or two Pole pipe (D2), the first output filter capacitor (C1) and the second output filter capacitor (C2) composition；
The ac voltage input of described rectifier bridge and single phase alternating current power supply (vAC) be connected, rectifier bridge output voltage (vDC) Anode is connected in boost inductance (Lb) one end, boost inductance (Lb) the other end be connected in second switch pipe (S2) drain electrode and Two diode (D2) anode, the second diode (D2) negative electrode be connected in the second output filter capacitor (C2) one end, i.e. HVDC output (vH) anode, second switch pipe (S2) source electrode be connected in the first switching tube (S1) drain electrode and the one or two Pole pipe (D1) anode, the first diode (D1) negative electrode be connected in the first output filter capacitor (C1) one end, i.e. low pressure Direct current output (vL) anode, the first switching tube (S1) source electrode be connected in the first output filter capacitor (C1) the other end, i.e. Low-voltage direct output (vL) negative terminal, the second output filter capacitor (C2) the other end, i.e. HVDC output (vH) negative End and rectifier bridge output voltage (vDC) negative terminal.
Two-stage type AC-DC converter the most according to claim 1, it is characterised in that described dual output pfc converter By rectifier bridge, boost inductance (Lb), the first switching tube (S1), second switch pipe (S2), the first diode (D1), the two or two Pole pipe (D2), the first output filter capacitor (C1) and the second output filter capacitor (C2) composition；
The ac voltage input of described rectifier bridge and single phase alternating current power supply (vAC) be connected, rectifier bridge output voltage (vDC) Anode is connected in boost inductance (Lb) one end, boost inductance (Lb) the other end be connected in the first switching tube (S1) drain electrode, One diode (D1) anode and the second diode (D2) anode, the second diode (D2) negative electrode be connected in the second output Filter capacitor (C2) one end, i.e. HVDC output (vH) anode, the first diode (D1) negative electrode be connected in second Switching tube (S2) drain electrode, second switch pipe (S2) source electrode be connected in the first output filter capacitor (C1) one end, the lowest Straightening stream output (vL) anode and the second output filter capacitor (C2) the other end, the first switching tube (S1) source electrode be connected in First output filter capacitor (C1) the other end, i.e. HVDC output (vH) and low-voltage direct output (vL) public negative End and rectifier bridge output voltage (vDC) negative terminal.
Two-stage type AC-DC converter the most according to claim 1, it is characterised in that described dual output pfc converter By boost inductance (Lb), the first switching tube (S1), second switch pipe (S2), the 3rd switching tube (S3), the first diode (D1)、 Second diode (D2), the 3rd diode (D3), the first output filter capacitor (C1) and the second output filter capacitor (C2) Composition；
Described boost inductance (Lb) one end be connected in single phase alternating current power supply (vAC) one end, boost inductance (Lb) the other end It is connected in the first switching tube (S1) drain electrode and second switch pipe (S2) source electrode, second switch pipe (S2) drain electrode be connected in second Diode (D2) negative electrode, the 3rd diode (D3) anode and the (S of the 3rd switching tube3) drain electrode, the 3rd switching tube (S3) Source electrode be connected in the first output filter capacitor (C1) one end, i.e. low-voltage direct output (vL) anode, the 3rd diode (D3) Negative electrode be connected in the second output filter capacitor (C2) one end, i.e. HVDC output (vH) anode, the first switching tube (S1) Source electrode be connected in the first output filter capacitor (C1) the other end, i.e. low-voltage direct output (vL) negative terminal, second output filter Ripple electric capacity (C2) the other end, i.e. HVDC output (vH) negative terminal and the first diode (D1) anode, the one or two Pole pipe (D1) negative electrode be connected in the second diode (D2) anode and single phase alternating current power supply (vAC) the other end.
Two-stage type AC-DC converter the most according to claim 1, it is characterised in that described dual output pfc converter By boost inductance (Lb), the first switching tube (S1), second switch pipe (S2), the 3rd switching tube (S3), the first diode (D1)、 Second diode (D2), the 3rd diode (D3), the 4th diode (D4), the first output filter capacitor (C1) and second Output filter capacitor (C2) composition；
Described boost inductance (Lb) one end be connected in single phase alternating current power supply (vAC) one end, boost inductance (Lb) the other end It is connected in the first switching tube (S1) drain electrode, second switch pipe (S2) source electrode and the 4th diode (D4) anode, second Switching tube (S2) drain electrode be connected in the second diode (D2) negative electrode and the second output filter capacitor (C2) one end, the highest Straightening stream output (vH) anode, the 4th diode (D4) negative electrode be connected in the 3rd diode (D3) negative electrode and the 3rd open Close pipe (S3) drain electrode, the 3rd switching tube (S3) source electrode be connected in the first output filter capacitor (C1) one end, i.e. low pressure Direct current output (vL) anode, the first switching tube (S1) source electrode be connected in the first output filter capacitor (C1) the other end, i.e. Low-voltage direct output (vL) negative terminal, the second output filter capacitor (C2) the other end, i.e. HVDC output (vH) Negative terminal and the first diode (D1) anode, the first diode (D1) negative electrode be connected in the second diode (D2) anode, 3rd diode (D3) anode and single phase alternating current power supply (vAC) the other end.
Two-stage type AC-DC converter the most according to claim 1, it is characterised in that described dual output PFC converts Device is by the first boost inductance (Lb1), the second boost inductance (Lb2), the first switching tube (S1), second switch pipe (S2), the 3rd Switching tube (S3), the first diode (D1), the second diode (D2), the 3rd diode (D3), the 4th diode (D4)、 5th diode (D5), the first output filter capacitor (C1) and the second output filter capacitor (C2) composition；
Described first boost inductance (Lb1) one end be connected in the first switching tube (S1) drain electrode and the 3rd diode (D3) sun Pole, the second boost inductance (Lb2) one end be connected in second switch pipe (S2) drain electrode and the 4th diode (D4) anode, 4th diode (D4) negative electrode be connected in the 3rd diode (D3) negative electrode, the 5th diode (D5) anode and the 3rd open Close pipe (S3) drain electrode, the 3rd switching tube (S3) source electrode be connected in the first output filter capacitor (C1) one end, i.e. low pressure Direct current output (vL) anode, the 5th diode (D5) negative electrode be connected in the second output filter capacitor (C2) one end, i.e. HVDC output (vH) anode, the second output filter capacitor (C2) the other end, i.e. HVDC output (vH) Negative terminal is connected in the first output filter capacitor (C1) the other end, i.e. low-voltage direct output (vL) negative terminal, the first switching tube (S1) Source electrode, second switch pipe (S2) source electrode, the first diode (D1) anode and the second diode (D2) anode, Second diode (D2) negative electrode be connected in the first boost inductance (Lb1) the other end and single phase alternating current power supply (vAC) one end, Single phase alternating current power supply (vAC) the other end be connected in the second boost inductance (Lb2) the other end and the first diode (D1) negative electrode.
11. two-stage type AC-DC converter according to claim 1, it is characterised in that described dual output PFC converts Device is by the first boost inductance (Lb1), the second boost inductance (Lb2), the first switching tube (S1), second switch pipe (S2), the 3rd Switching tube (S3), the 4th switching tube (S4), the first diode (D1), the second diode (D2), the 3rd diode (D3)、 4th diode (D4), the 5th diode (D5), the 6th diode (D6), the first output filter capacitor (C1) and second Output filter capacitor (C2) composition；
Described first boost inductance (Lb1) one end be connected in the first switching tube (S1) drain electrode and the 5th diode (D5) sun Pole, the second boost inductance (Lb2) one end be connected in the 3rd switching tube (S3) drain electrode and the 6th diode (D6) anode, First switching tube (S1) source electrode be connected in the 3rd diode (D3) anode and second switch pipe (S2) drain electrode, the 3rd opens Close pipe (S3) source electrode be connected in the 4th switching tube (D4) anode and the 4th switching tube (S4) drain electrode, the 5th diode (D5) Negative electrode be connected in the 6th diode (D6) negative electrode and the second output filter capacitor (C2) one end, i.e. HVDC output (vH) Anode, the 3rd diode (D3) negative electrode be connected in the 4th diode (D4) negative electrode and the first output filter capacitor (C1) One end, i.e. low-voltage direct output (vL) anode, the first output filter capacitor (C1) the other end, i.e. low-voltage DC Pressure output (vL) negative terminal be connected in the second output filter capacitor (C2) the other end, i.e. HVDC output (vH) negative terminal, Second switch pipe (S2) source electrode, the 4th switching tube (S4) source electrode, the first diode (D1) anode and the two or two pole Pipe (D2) anode, the second diode (D2) negative electrode be connected in the first boost inductance (Lb1) the other end and single-phase alternating current Source (vAC) one end, single phase alternating current power supply (vAC) the other end be connected in the second boost inductance (Lb2) the other end and first Diode (D1) negative electrode.
12. two-stage type AC-DC converter according to claim 1, it is characterised in that described dual output PFC converts Device is by boost inductance (Lb), the first switching tube (S1), second switch pipe (S2), the 3rd switching tube (S3), the first diode (D1)、 Second diode (D2), the 3rd diode (D3), the first output filter capacitor (C1) and the second output filter capacitor (C2) Composition；
Described boost inductance (Lb) one end be connected in the first switching tube (S1) drain electrode and the first diode (D1) anode, First diode (D1) negative electrode be connected in the second diode (D2) negative electrode, the 3rd switching tube (S3) drain electrode and the three or two Pole pipe (D3) anode, the 3rd diode (D3) negative electrode be connected in the second output filter capacitor (C2) one end, i.e. high pressure Direct current output (vH) anode, the 3rd switching tube (S3) source electrode be connected in the first output filter capacitor (C1) one end, i.e. Low-voltage direct output (vL) anode and the second output filter capacitor (C2) the other end, the first output filter capacitor (C1) The other end, i.e. HVDC output (vH) and low-voltage direct output (vL) public negative terminal be connected in the first switching tube (S1) Source electrode and second switch pipe (S2) source electrode, second switch pipe (S2) drain electrode be connected in the second diode (D2) anode and Single phase alternating current power supply (vAC) one end, single phase alternating current power supply (vAC) the other end be connected in boost inductance (Lb) the other end.
13. two-stage type AC-DC converter according to claim 1, it is characterised in that described dual output PFC converts Device is by the first boost inductance (Lb1), the second boost inductance (Lb2), the first switching tube (S1), second switch pipe (S2), the 3rd Switching tube (S3), the 4th switching tube (S4), the first low tension switch pipe (SL1), the second low tension switch pipe (SL2), the 3rd low pressure Switching tube (SL3), the 4th low tension switch pipe (SL4), the first output filter capacitor (C1) and the second output filter capacitor (C2) Composition；
Described first boost inductance (Lb1) one end be connected in the 3rd switching tube (S3) source electrode, the 4th switching tube (S4) leakage Pole and the first low tension switch pipe (SL1) source electrode, the second boost inductance (Lb2) one end be connected in second switch pipe (S2) leakage Pole, the first switching tube (S1) source electrode and the 3rd low tension switch pipe (SL3) source electrode, the first switching tube (S1) drain electrode even In the 3rd switching tube (S3) drain electrode and the second output filter capacitor (C2) one end, i.e. HVDC output (vH) just End, the first low tension switch pipe (SL1) drain electrode be connected in the second low tension switch pipe (SL2) drain electrode, the 3rd low tension switch pipe (SL3) Drain electrode be connected in the 4th low tension switch pipe (SL4) drain electrode, the 4th low tension switch pipe (SL4) source electrode be connected in the second low tension switch Pipe (SL2) source electrode and the first output filter capacitor (C1) one end, i.e. low-voltage dc voltage output (vL) anode, One output filter capacitor (C1) the other end, i.e. low-voltage direct output (vL) negative terminal be connected in the second output filter capacitor (C2) The other end, i.e. HVDC output (vH) negative terminal, second switch pipe (S2) source electrode and the 4th switching tube (S4) source Pole, single phase alternating current power supply (vAC) one end be connected in the first boost inductance (Lb1) the other end, single phase alternating current power supply (vAC) The other end be connected in the second boost inductance (Lb2) the other end.
14. two-stage type AC-DC converter according to claim 2, it is characterised in that described dual output PFC converts Device is by A phase boost inductance (LA), B phase boost inductance (LB), C phase boost inductance (LC), the first switching tube (S1), Two switching tube (S2), the 3rd switching tube (S3), the 4th switching tube (S4), the 5th switching tube (S5), the 6th switching tube (S6)、 First low tension switch pipe (SL1), the second low tension switch pipe (SL2), the 3rd low tension switch pipe (SL3), the 4th low tension switch pipe (SL4)、 5th low tension switch pipe (SL5), the 6th low tension switch pipe (SL6), the first output filter capacitor (C1) and the second output filtered electrical Hold (C2) composition；
Described three-phase alternating-current supply (vABC) m end be connected in A phase boost inductance (LA) one end, three-phase alternating-current supply (vABC) N end be connected in B phase boost inductance (LB) one end, three-phase alternating-current supply (vABC) p end be connected in C phase boost inductance (LC) One end, A phase boost inductance (LA) the other end be connected in the 5th switching tube (S5) source electrode, the 6th switching tube (S6) leakage Pole and the first low tension switch pipe (SL1) source electrode, B phase boost inductance (LB) the other end be connected in the 3rd switching tube (S3) Source electrode, the 4th switching tube (S4) drain electrode and the 3rd low tension switch pipe (SL3) source electrode, C phase boost inductance (LC) another One end is connected in the first switching tube (S1) source electrode, second switch pipe (S2) drain electrode and the 5th low tension switch pipe (SL5) source Pole, the first switching tube (S1) drain electrode be connected in the 3rd switching tube (S3) drain electrode, the 5th switching tube (S5) drain electrode and second Output filter capacitor (C2) one end, i.e. HVDC output (vH) anode, the first low tension switch pipe (SL1) drain electrode It is connected in the second low tension switch pipe (SL2) drain electrode, the 3rd low tension switch pipe (SL3) drain electrode be connected in the 4th low tension switch pipe (SL4) Drain electrode, the 5th low tension switch pipe (SL5) drain electrode be connected in the 6th low tension switch pipe (SL6) drain electrode, the 6th low tension switch pipe (SL6) source electrode be connected in the 4th low tension switch pipe (SL4) source electrode, the second low tension switch pipe (SL2) source electrode and first output Filter capacitor (C1) one end, i.e. low-voltage direct output (vL) anode, the first output filter capacitor (C1) the other end, I.e. low-voltage direct output (vL) negative terminal be connected in the second output filter capacitor (C2) the other end, i.e. HVDC output (vH) Negative terminal, the 6th switching tube (S6) source electrode, the 4th switching tube (S4) source electrode and second switch pipe (S2) source electrode.
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