CN113206601A - Direct current charger based on single-phase II type three-level pseudo totem pole - Google Patents

Direct current charger based on single-phase II type three-level pseudo totem pole Download PDF

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CN113206601A
CN113206601A CN202110389117.3A CN202110389117A CN113206601A CN 113206601 A CN113206601 A CN 113206601A CN 202110389117 A CN202110389117 A CN 202110389117A CN 113206601 A CN113206601 A CN 113206601A
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switch tube
diode
type
current
phase
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CN113206601B (en
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马辉
徐甜川
敬成
代红
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China Three Gorges University CTGU
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China Three Gorges University CTGU
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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
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/066—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode particular circuits having a special characteristic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • 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
    • 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
    • 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
    • H02M7/219—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 in a bridge configuration
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00—Converter types
    • B60L2210/30—AC to DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The direct current charger based on the single-phase II-type three-level pseudo totem pole comprises a pseudo totem pole bridge arm, a filter circuit and a single-phase II-type rectifier bridge; the pseudo totem pole bridge arm comprises a switch tube S1、S2Diode D3、D4(ii) a The filter circuit comprises a filter inductor L1、L2(ii) a The single phase IThe I-type bridge comprises a diode D1、D2A pair of bidirectional switch tubes and a capacitor C1、C2Load RL(ii) a The pair of bidirectional switch tubes comprises a switch tube S3~S6. The single-phase II-type three-level pseudo-totem-pole-based direct current charger disclosed by the invention integrates a pseudo-totem-pole rectification technology and a three-level topology technology, and can effectively reduce the stress of a switching tube, the conduction loss of the switching tube is small and the bridge arm direct connection phenomenon does not exist compared with the traditional boosting power factor correction type two-level direct current charger; meanwhile, the reliability of the direct current charging circuit is greatly improved due to the fact that the II-type two-switch-tube series connection type bidirectional switch branch circuit exists in the circuit.

Description

Direct current charger based on single-phase II type three-level pseudo totem pole
Technical Field
The invention relates to the technical field of power electronic electric energy conversion, in particular to a single-phase II-type three-level pseudo totem pole-based direct-current charger.
Background
Electric vehicles such as electric automobiles and the like have the advantages of high energy utilization rate, cleanness, no pollution and the like, but charging equipment for charging the electric vehicles is slow to develop, and meanwhile, chargers in alternating current and direct current charging modes and different power levels bring different charging speed and low level safety problems in the charging process. In addition, a charging device power factor that is too low may load the grid or waste grid capacity. The international electrotechnical commission has made strict standards for the harmonic components contained in various types of charging power supply currents for ac-dc conversion. Compared with the traditional bridgeless power factor correction circuit, the pseudo totem pole two-level power factor correction circuit has the advantages of high efficiency, no bridge arm direct connection and the like, but the circuit enables devices to bear all voltages of a power grid, is high in cost when components are selected, and simultaneously limits the application of a two-level direct current charger in the scenes of medium-voltage and high-voltage power direct current charging equipment.
Disclosure of Invention
In order to solve the technical problems, the invention provides a single-phase II-type three-level pseudo-totem-pole-based direct-current charger, wherein a traditional pseudo-totem-pole-type structure is combined with a three-level rectifier bridge, the direct-current charger improves the reliability of a circuit, reduces the stress of switching voltage, improves the current sine degree, reduces the harmonic content, and has obvious competitive advantages in a single-phase power grid application scene.
The technical scheme adopted by the invention is as follows:
direct current charger based on three level pseudo totem poles of single-phase II type, this direct current charger includes:
the pseudo totem pole bridge arm comprises a pseudo totem pole bridge arm, a filter circuit, a single-phase II-type rectifier bridge and a pseudo totem pole bridge arm;
the pseudo totem pole bridge arm comprises a switch tube S1、S2Diode D3、D4；
The filter circuit comprises a filter inductor L1、L2；
The single-phase II-type rectifier bridge comprises a diode D1、D2A pair of bidirectional switch tubes and a capacitor C1、C2Load RL；
The pair of bidirectional switch tubes comprises a switch tube S3～S6；
AC power supply usOne end is respectively connected with a diode D1Anode, diode D2Cathode, AC power source usThe other ends are respectively connected with a filter inductor L1One terminal, filter inductor L2One end;
filter inductance L1The other ends are respectively connected with a diode D3Anode and switch tube S3Source electrode, switch tube S1A drain electrode;
filter inductance L2The other ends are respectively connected with a diode D4Cathode and switch tube S2Source electrode, switch tube S5A source electrode;
diode D1The cathodes are respectively connected with a diode D3Cathode and switch tube S2Drain electrode, capacitor C1A positive electrode;
diode D2The anodes are respectively connected with a switch tube S1Source, diode D4Anode and capacitor C2A negative electrode;
switch tube S3The drain electrode is connected with a switch tube S4Drain electrode, switching tube S5The drain electrode is connected with a switch tube S6A drain electrode;
switch tube S4The source electrodes are respectively connected with a switch tube S6Source electrode, capacitor C1Negative electrode and capacitor C2A positive electrode;
load RLTwo ends are respectively connected with a capacitor C1Positive electrode and capacitor C2And a negative electrode.
The pseudo totem pole bridge arm is composed of a switch tube S1、S2And a diode D3、D4A pair of asymmetric rectifier bridge arms is formed, each rectifier bridge arm comprises a power switch tube, and each power switch tube is provided with a clamping diode.
The DC charger comprises a II-type two-switch series bidirectional switch tube branch structure composed of 2 reverse series fully-controlled switch tubes connected with an inductor L1Two connected switches series bidirectional switch tube S3、S4Is an upper bidirectional switch tube and an inductor L2Two connected switches series bidirectional switch tube S5、S6Is a lower bidirectional switch tube.
The switch tube S1～S6Both MOSFETs with body diodes or IGBTs.
The single-phase II-type rectifier bridge comprises two switching tube series-connected bidirectional switches with the same structure and two parallel inductors L1、L2And the connection is used for controlling the bidirectional circulation of the inductive current between the capacitors and realizing the three-level output between the bridge arms.
The direct current charger circuit is characterized in that two same inductors are connected in parallel at one end of an alternating current power supply, and the double-tube structure boost converter enables partial switch tubes to have lower voltage/current stress, small conduction loss of the switch tubes and higher voltage gain.
The bridge arm in the direct current charger adopts a pseudo totem-pole structure, the pseudo totem-pole structure is reserved, the problems of bridge arm direct connection hidden danger and no switch tube body diode reverse recovery are solved, and the direct current charger has the advantages of high reliability, high efficiency and the like.
The invention discloses a single-phase II-type three-level pseudo totem pole-based direct-current charger which has the following beneficial effects:
1) the pseudo totem-pole rectifier circuit adopts a pseudo totem-pole structure, and reserves the advantages of no bridge arm direct potential hazard, no switch tube body diode reverse recovery problem, high reliability, high efficiency and the like of the pseudo totem-pole rectifier;
2) the pseudo totem-pole rectifier combines the pseudo totem-pole structure with the three-level rectifier bridge, and adds a group of diode bridge arms and a II-type two-switch series bidirectional switch on the basis of the traditional pseudo totem-pole rectifier, thereby reducing the switching stress, solving the problem of high voltage resistance of a switching tube and being suitable for high-voltage output occasions.
3) The invention adopts two switch series connection type bidirectional switch branch circuits and an inductor L respectively1、L2And when any two-way switching tube is damaged, the three-level output of the circuit cannot be influenced, so that the reliability of the circuit is greatly improved.
4) Compared with the traditional boost power factor correction type two-level direct current charger, the boost power factor correction type two-level direct current charger has the advantages that the stress of a switching tube can be effectively reduced, the conduction loss of the switching tube is small, and the phenomenon of direct connection of a bridge arm does not exist; meanwhile, the reliability of the direct current charging circuit is greatly improved due to the fact that the II-type two-switch-tube series connection type bidirectional switch branch circuit exists in the circuit.
Drawings
Fig. 1 is a main topology structure diagram of a single-phase II-type three-level pseudo totem pole-based dc charger of the present invention.
FIG. 2 is a first stage diagram of the working state of a single-phase II-type three-level pseudo totem pole-based DC charger according to the present invention;
FIG. 3 is a second phase diagram of the working state of a single-phase II-type three-level pseudo totem pole-based DC charger according to the present invention;
FIG. 4 is a third stage diagram of the working state of a single-phase II-type three-level pseudo totem pole-based DC charger according to the present invention;
FIG. 5 is a fourth stage diagram of the working state of the single-phase II-type three-level pseudo totem pole-based DC charger of the present invention;
FIG. 6 is a fifth stage diagram of the working state of the single-phase II-type three-level pseudo totem pole-based DC charger of the present invention;
fig. 7 is a sixth stage diagram of the working state of the single-phase II-type three-level pseudo totem pole-based dc charger of the present invention.
FIG. 8 shows a switching tube S of a single-phase II-type three-level pseudo totem pole-based DC charger according to the present invention1～S6Corresponding pulse distribution diagram.
FIG. 9 is a waveform diagram of voltage and current at the input side of a single-phase II-type three-level pseudo totem pole-based DC charger in a steady state according to the present invention;
FIG. 10 shows an inductance L of a single-phase II-type three-level pseudo totem pole-based DC charger in a stable state according to the present invention1A current waveform diagram of (a);
FIG. 11 shows an inductance L of a single-phase II-type three-level pseudo totem pole-based DC charger in a stable state according to the present invention2A current waveform diagram of (a);
FIG. 12 shows the voltage u of a single-phase II-type three-level pseudo totem pole-based DC charger in a steady stateB1OA waveform diagram;
FIG. 13 shows the voltage u of a single-phase II-type three-level pseudo totem pole-based DC charger in a steady stateB2OA waveform diagram;
FIG. 14 shows a DC output voltage u of a single-phase II-type three-level pseudo totem pole-based DC charger in a steady statedcAnd (4) waveform diagrams.
Detailed Description
As shown in fig. 1, the direct current charger based on the single-phase II-type three-level pseudo totem pole includes a pair of pseudo totem pole arms, a filter circuit, a single-phase II-type rectifier bridge, a two-switch-tube series-connected bidirectional switch branch of the II-type, and a dc-side up-down split capacitor.
The pair of pseudo totem-pole bridge arm structures comprises two full-control power switch tubes S1、S 22 ordinary diodes D3、D4By a fully-controlled power switching tube S1、S2And a diode D3、D4A pair of asymmetric rectifier bridge arms is formed, and each bridge arm comprises 1 power switch device and 1 clamping diode. S1Drain electrode, inductor L1Diode D3The anode is connected with the node B1，S2Source electrode, inductor L2Diode D4The cathode is connected to the node B2。
The filter circuit is composed of a filter inductor L1、L2Component, filter inductance L1、L2Identical, filter inductance L1Another terminal, filter inductance L2The other end is respectively connected with a full-control switch tube S1Drain electrode of (1), S2Is connected with the source electrode of the filter inductor L1、L2One end is connected in parallel with an AC power supply usOn the positive electrode of (1), an AC power source u is definedsThe negative electrode of (b) is a node O.
The single-phase II type rectifier bridge consists of 2 diodes D1、D2A pair of bidirectional switch tubes and 2 capacitors C1、C2And a load RLAnd (4) forming. Wherein, the diode D1Anode connected diode D2Cathode, diode D1、D2The connection point is connected with an alternating current power supply usWith its cathode at node O.
The two-switch series-connected type II bidirectional switch branch circuit is composed of 2 full-control type switch tubes which are reversely connected in series, and the single-phase II type rectifier bridge comprises two-switch series-connected bidirectional switches, a definition and an inductor L1The connected bidirectional switch tube is an upper bidirectional switch tube and an inductor L2The connected bidirectional switch tube is a lower bidirectional switch tube.
The structure of the bidirectional switch tube is described as an example: the bidirectional switch tube comprises 2 full-control switch tubes S3、S4Fully-controlled switch tube S3Source and inductor L1Is connected to node B1Fully-controlled switch tube S3Drain electrode and full-control type switch tube S4Is connected with the drain electrode of the full-control type switch tube S4Source electrode and series capacitor C1、C2Is connected to the node n; the lower bidirectional switch tube is identical to the upper bidirectional switch tube, and the fully-controlled switch tube S5Source and inductor L2Is connected to node B2Fully-controlled switch tube S6Source electrode and switch tube S4Are connected. Capacitor C1Positive electrode and capacitor C2Are respectively connected with a load, a diode D1、D3Cathode and switching tube S2Is connected with the drain electrode of the capacitor C, and the connection point of the drain electrode is connected with the capacitor C1Is intersected at a node p, a diode D2、D4Anode and switch tube S1Is connected with the source of the capacitor C2Intersects at node m.
The specific experimental parameters were as follows:
the invention relates to a single-phase II-type three-level pseudo-totem-pole-based direct-current charger, wherein the effective value of the voltage of a power grid at the input side is 220V, the frequency is 50Hz, the output voltage of the direct-current side is 400V, the switching frequency is 20kHz, and a filter inductor L1＝L23mH, load RLHas a resistance value of 80 omega, and an output capacitor C1＝C2＝4700μF。
The invention relates to a single-phase II-type three-level pseudo totem-pole-based direct-current charger, wherein when a circuit normally works, the circuit comprises 6 working modes in a stable state:
(1) three operating modes in the positive half cycle: network voltage usAnd an output current isAre all greater than 0.
As shown in fig. 2, mode one: switch tube S1～S6All are turned off, AC power usAnd an inductance L1And an inductance L2To a load RLProviding energy, diode D2、D3And a switching tube S2The body diode is forward biased to conduct, and the DC output voltage udc>usLinear decrease of the inductor current, capacitance C1、C2In a charging state, the charging current is equal to is-idcVoltage uB1O＝uB2O＝uc1+uc2＝+udc；
As shown in fig. 3, mode two: switch tube S1、S2、S3Turn-off, switch tube S4、S5、S6On, the capacitance C2Charging with a charging current of is-idcCapacitor C1Discharging to a load to supply a current idcVoltage uB1O＝uB2O＝uc1＝+udc/2；
As shown in fig. 4, mode three: switch tube S2～S6All are turned off, the switch tube S1Conducting, diode D2、D4Forward biased conduction, ACPower supply usTo the inductance L1Charging, inductance L1The current shows linear rising, the capacitance C1And C2To a load RLDischarge, inductance L1At this time the voltage uB1O＝0；
(2) Three working modes of the negative half period: network voltage usAnd an output current isAre all less than 0.
As shown in fig. 5, mode four: switch tube S2Conducting, switching tube S1、S3、S4、S5、S6Turn-off, diode D1Positive bias conducting, AC power usTo the inductance L2Charging, inductance L2The current shows linear rising, the capacitance C1And C2Continue to the load RLDischarge, at this time, the inductance L2Voltage uB2O＝0；
As shown in fig. 6, mode five: switch tube S3、S5Conducting, switching tube S1、S2、S4、S6Off, capacitance C1Charging at a charging current of-is-idcCapacitor C2Discharging to a load to supply a current idcVoltage uB1O＝uB2O＝uc2＝-udc/2；
As shown in fig. 7, mode six: switching tube full-off, AC power usAnd an inductance L1And an inductance L2To a load RLProviding energy, diode D4、D1And a switching tube S2The body diode is forward biased to conduct, and the DC output voltage udc>usLinear decrease of the inductor current, capacitance C1、C2In a charging state, the charging current is equal to is-idcVoltage uB1O＝uB2O＝-uc1-uc2＝-udc；
In the six operating modes shown in fig. 2 to 7, the two inductors simultaneously implement the boosting process.
TABLE 1 switching tube S in the practice of the invention1～S6State table under six working modes
TABLE 1 State table under six working modes
Figure BDA0003016209510000051
As shown in Table 1, the circuit has six working modes in one cycle, when u iss>At 0, bridge arm voltage has 0, + udc/2、+udcThree states; when u iss<Bridge arm voltage 0 and udc/2、-udcIn the three states, under different working modes, each parameter of the system also changes, wherein 1 represents the conduction of the switch tube, and 0 represents the disconnection of the switch tube. FIG. 8 shows a switch S of the circuit of the present invention1～S6And a pulse distribution diagram in one cycle, wherein the gate drive voltage is unitized, the gate voltage is applied to the switching tube by 1, and the gate voltage is not applied to the switching tube by 0.
As shown in fig. 9, the ac input voltage is multiplied by a gain of 0.1 times, and compared with the inductor current with an oscilloscope, and the ac input voltage and the input current are in phase, so that a high power factor can be realized;
FIG. 10 is a flow through inductor L1Current of, by letter iL1Represents; FIG. 11 shows the current flowing through the inductor L2Current of, by letter iL2And (4) showing. The fact that the current of the two inductors is in the same phase and the current waveform changes in a sine mode is verified under all working modes.
FIG. 12 shows bridge arm voltage uB1OA waveform diagram; FIG. 13 shows bridge arm voltage uB2OA waveform diagram;
as shown in fig. 12 and 13, the voltage uB1OCan generate three-level voltage in the whole period, voltage uB2OGenerating and u in the whole periodB2OThree level voltages of the same phase; fig. 14 shows that the rectifier achieves dc output voltage stabilization.

Claims (5)

1. Direct current charger based on single-phase II type three-level pseudo totem pole, characterized by that this direct current charger includes:
the pseudo totem pole bridge arm comprises a pseudo totem pole bridge arm, a filter circuit, a single-phase II-type rectifier bridge and a pseudo totem pole bridge arm;
the pseudo totem pole bridge arm comprises a switch tube S1、S2Diode D3、D4；
The filter circuit comprises a filter inductor L1、L2；
The single-phase II-type rectifier bridge comprises a diode D1、D2A pair of bidirectional switch tubes and a capacitor C1、C2Load RL；
The pair of bidirectional switch tubes comprises a switch tube S3～S6；
AC power supply usOne end is respectively connected with a diode D1Anode, diode D2Cathode, AC power source usThe other ends are respectively connected with a filter inductor L1One terminal, filter inductor L2One end;
filter inductance L1The other ends are respectively connected with a diode D3Anode and switch tube S3Source electrode, switch tube S1A drain electrode;
filter inductance L2The other ends are respectively connected with a diode D4Cathode and switch tube S2Source electrode, switch tube S5A source electrode;
diode D1The cathodes are respectively connected with a diode D3Cathode and switch tube S2Drain electrode, capacitor C1A positive electrode;
diode D2The anodes are respectively connected with a switch tube S1Source, diode D4Anode and capacitor C2A negative electrode;
switch tube S3The drain electrode is connected with a switch tube S4Drain electrode, switching tube S5The drain electrode is connected with a switch tube S6A drain electrode;
switch tube S4The source electrodes are respectively connected with a switch tube S6Source electrode, capacitor C1Negative electrode and capacitor C2A positive electrode;
load RLTwo ends are respectively connected with a capacitor C1Positive electrode and capacitor C2And a negative electrode.
2. The single-phase type II three-level pseudo-totem pole-based dc charger of claim 1, characterized by: the pseudo totem pole bridge arm is composed of a switch tube S1、S2And a diode D3、D4A pair of asymmetric rectifier bridge arms is formed, each rectifier bridge arm comprises a power switch tube, and each power switch tube is provided with a clamping diode.
3. The single-phase type II three-level pseudo-totem pole-based dc charger of claim 1, characterized by: the DC charger comprises a II-type two-switch series bidirectional switch tube branch structure composed of 2 reverse series fully-controlled switch tubes connected with an inductor L1Two connected switches series bidirectional switch tube S3、S4Is an upper bidirectional switch tube and an inductor L2Two connected switches series bidirectional switch tube S5、S6Is a lower bidirectional switch tube.
4. The single-phase type II three-level pseudo-totem pole-based dc charger of claim 1, characterized by: the switch tube S1～S6Both MOSFETs with body diodes or IGBTs.
5. The single-phase type II three-level pseudo totem pole-based DC charger according to any of claims 1-4,
the method is characterized in that: when the circuit is working normally, the inductor L1Has a current of iL1Inductance L2Has a current of iL2To the power grid output current isComprises the following steps: i.e. is＝iL1+iL2The circuit in steady state comprises 6 operating modes:
(1) three operating modes in the positive half cycle: network voltage usAnd an output current isAre all larger than 0;
the first mode is as follows: switch tube S1～S6All are turned off, AC power usAnd an inductance L1And an inductance L2To a load RLProviding energy, diode D2、D3And a switching tube S2The body diode is forward biased to conduct, and the DC output voltage udc>usLinear decrease of the inductor current, capacitance C1、C2In a charging state, the charging current is equal to is-idcVoltage uB1O＝uB2O＝uc1+uc2＝+udc；
And a second mode: switch tube S1、S2、S3Turn-off, switch tube S4、S5、S6On, the capacitance C2Charging with a charging current of is-idcCapacitor C1Discharging to a load to supply a current idcVoltage uB1O＝uB2O＝uc1＝+udc/2；
And a third mode: switch tube S2～S6All are turned off, the switch tube S1Conducting, diode D2、D4Positive bias conducting, AC power usTo the inductance L1Charging, inductance L1The current shows linear rising, the capacitance C1And C2To a load RLDischarge, inductance voltage u at this timeB1O＝0；
(2) Three working modes of the negative half period: network voltage usAnd an output current isAre all less than 0;
and a fourth mode: switch tube S2Conducting, switching tube S1、S3、S4、S5、S6Turn-off, diode D1Positive bias conducting, AC power usTo the inductance L2Charging, inductance L2The current shows linear rising, the capacitance C1And C2Continue to the load RLDischarge at this time of voltage uB2O＝0；
And a fifth mode: switch tube S3、S5Conducting, switching tube S1、S2、S4、S6Off, capacitance C1Charging at a charging current of-is-idcCapacitor C2Discharging to a load to supply a current idcVoltage uB1O＝uB2O＝uc2＝-udc/2；
Mode six: switching tube full-off, AC power usAnd an inductance L1And an inductance L2To a load RLProviding energy, diode D4、D1And a switching tube S2The body diode is forward biased to conduct, and the DC output voltage udc>usLinear decrease of the inductor current, capacitance C1、C2In a charging state, the charging current is equal to is-idcVoltage uB1O＝uB2O＝-uc1-uc2＝-udc。
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