CN111416533B - Single-phase five-level rectifier based on four-port plug-in - Google Patents
Single-phase five-level rectifier based on four-port plug-in Download PDFInfo
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- CN111416533B CN111416533B CN202010333724.3A CN202010333724A CN111416533B CN 111416533 B CN111416533 B CN 111416533B CN 202010333724 A CN202010333724 A CN 202010333724A CN 111416533 B CN111416533 B CN 111416533B
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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
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
Four-port plug-in type single-phase five-level rectifier comprising alternating current power supply u g Double-coupling magnetic winding N 1 Double-coupling magnetic winding N 2 Capacitance C 1 Capacitance C 2 Switch tube Q 1 ～Q 3 Diode D 1 ～D 10 Load R. The invention is based on a four-port plug-in single-phase five-level rectifier, integrates a double-coupling magnetic winding and a five-level circuit structure, only adopts three switching tubes to be matched for use, and lifts the level number to five levels, and still has better electric energy quality under the condition of load fluctuation. Compared with the traditional three-level rectifier, the three-level rectifier has the advantages of low harmonic content, small voltage stress of a switching tube, high power density and the like. The invention is suitable for the rectifying circuit with high efficiency and high reliability under the medium and small power level.
Description
Technical Field
The invention belongs to the technical field of alternating current-direct current multi-level converters, and particularly relates to a four-port plug-in type single-phase five-level rectifier.
Background
In the technical field of alternating current-direct current conversion, the traditional rectifier, such as diode uncontrolled rectification and thyristor phase control rectification, has the advantages of simple structure and easy control realization, but can inject a large amount of harmonic waves at the network side, so that the harmonic pollution of the power grid is serious, the harmonic content is difficult to control in the existing harmonic standard range, and the reliability and the safety are low. And thus has gradually exited industrial applications.
In order to solve the above problems, active power factor correction is currently adopted in a more manner, that is, an input current waveform is caused to follow an input voltage waveform by controlling active devices such as a switching tube. In the traditional three-level rectifying circuit, the withstand voltage value of the power device is limited, and in order to achieve a better filtering effect, a large-size inductor is needed, so that the cost is increased to a certain extent, the power density and the efficiency are reduced, and the three-level rectifying circuit is not suitable for medium-high voltage high-power occasions. Therefore, it is a key to further study the circuit topology and to take effective control methods to solve the above problems.
Disclosure of Invention
The three-level rectifier aims at solving the problems that a traditional three-level rectifier is high in harmonic content, limited in voltage resistance of a power device and the like. The invention improves the structure of the traditional three-level rectifying circuit, and provides a four-port-insertion-based single-phase five-level rectifier, which can raise the level number to five levels and further improve the working efficiency; compared with the traditional three-level rectifier, the rectifier has the advantages of low harmonic content, small voltage stress of a switching tube, high power density and the like, and is suitable for a high-efficiency and high-reliability rectifying circuit under a medium-small power level.
The technical scheme adopted by the invention is as follows:
based on four-port plug-in single-phase five-level rectifier, include:
double-coupling magnetic winding N 1 Double-coupling magnetic winding N 2 Capacitance C 1 Capacitance C 2 Switch tube Q 1 ～Q 3 Diode D 1 ～D 10 ；
AC power supply u g One end of diode D 1 Cathode, winding N of (a) 1 Is connected with one end of the connecting rod to form an end point c;
AC power supply u g Is connected with the other end of diode D 2 Cathode, winding N of (a) 2 Is connected with one end of the connecting rod to form an end point d;
winding N 1 Is connected with the other end of diode D 3 Anode, switch tube Q of (2) 1 Is connected with the collector of the capacitor to form an endpoint a;
winding N 2 Is connected with the other end of diode D 4 Is connected with the anode to form an endpoint b;
diode D 4 Cathode, diode D of (2) 5 Anode, diode D of (c) 6 Is connected with the cathode of the electrode to form an end point e;
diode D 3 Cathode, diode D of (2) 7 Is connected with the cathode of the capacitor to form an endpoint f;
diode D 5 Cathode, diode D of (2) 7 Anode, diode D of (c) 8 Cathode of (d) switch tube Q 3 Is connected with the collector of the capacitor to form an endpoint g;
diode D 6 Anode, diode D of (c) 9 Anode, switch tube Q of (2) 3 Emitter, switch tube Q 2 Is connected with the collector electrode to form an endpoint h;
diode D 1 Anode, diode D of (c) 2 Anode, diode D of (c) 10 Cathode of (d) switch tube Q 1 Emitter, switch tube Q 2 Emitter connections of (a) to form an endpoint i;
capacitor C 1 The positive electrode of the load R is connected with one end of the load R to form an endpoint m, and the endpoint m is connected with an endpoint f;
diode D 8 Anode, diode D of (c) 9 Cathode, capacitor C of (2) 1 Negative electrode of (C) and capacitor C 2 Is connected with the positive electrode of the battery to form an endpoint o;
diode D 10 Anode, capacitance C of (C) 2 The negative electrode of (2) and the other end of the load R are connected to form an end point n.
The double-coupling magnetic winding N 1 Comprising winding N 11 Winding N 12 Winding N 11 、N 21 Adopts common-core co-directional winding to form an inductor L 1 ；
Double-coupling magnetic winding N 2 Comprising winding N 21 Winding N 22 The method comprises the steps of carrying out a first treatment on the surface of the Winding N 12 、N 22 Adopts the common-core reverse winding to form the inductor L 2 ；
The turns of the two groups of windings are identical, the magnetic cores are completely matched, and the inductance values are equal.
The terminals e, f, i and o in the rectifier form a four-port plug-in structure.
The diode D 1 、D 2 Is a common diode; diode D 1 、D 2 The output end and the input end are connected, a low-impedance current path is always provided for loop current, and common-mode interference is attenuated.
D 3 ～D 10 Is a fast recovery diode, wherein diode D 4 、D 10 The circuit is used as voltage clamp, can ensure unidirectional power circulation and improves the working reliability of the circuit.
The capacitor C 1 Capacitance C 2 All are equivalent electrolytic capacitors, are used for balancing midpoint potential of the direct current side, and have voltage stabilizing effect.
The switch tube Q 1 ～Q 3 N-IGBT is an N-channel insulated gate bipolar transistor without body diode.
The invention discloses a four-port plug-in type single-phase five-level rectifier, which has the following technical effects:
(1) Compared with the traditional three-level rectifier, the circuit topology structure disclosed by the invention has the advantages that the magnetic windings and the five-level circuit structure are fused and coupled, the harmonic content is reduced, the inductance volume is reduced, and the voltage stress of a switching tube is reduced by half;
(2) The circuit of the invention is formed by the terminals e, f, i, o into a four-port plug-in structure, which not only can realize voltage clamping, but also can realize multidirectional power circulation.
(3) Under the same power level, the circuit of the invention only adopts three body-free diode type N-channel insulated gate bipolar transistors N-IGBT, thereby overcoming the influence of parasitic body diodes in the power field effect transistor MOSFET on the working mode of the circuit, reducing the current flow path and having the advantages of small loss and low cost.
(4) The circuit disclosed by the invention integrates the double-coupling magnetic winding and the five-level circuit structure, only three switching tubes are used in a matched manner, the level number is lifted to five levels, and the circuit still has better electric energy quality under the condition of load fluctuation. Compared with the traditional three-level rectifier, the three-level rectifier has the advantages of low harmonic content, small voltage stress of a switching tube, high power density and the like. The invention is suitable for the rectifying circuit with high efficiency and high reliability under the medium and small power level.
Drawings
FIG. 1 is a circuit diagram of a topology structure of a single-phase five-level rectifier based on four-port insertion;
FIG. 2 is a circuit diagram of the circuit of the present invention in a positive half cycle of the power supply voltage;
FIG. 3 is a diagram of a second circuit of the present invention in the positive half cycle mode of operation of the power supply voltage;
FIG. 4 is a diagram of three circuits of the circuit of the present invention in the positive half cycle of the supply voltage;
FIG. 5 is a diagram of a fourth circuit of the present invention operating in the negative half cycle of the supply voltage;
FIG. 6 is a diagram of five circuit modes of the circuit of the present invention operating at the negative half cycle of the supply voltage;
FIG. 7 is a diagram of a sixth circuit of the present invention operating in the negative half cycle of the supply voltage;
FIG. 8 shows a circuit switching tube Q of the present invention 1 ～Q 3 Six working mode diagrams;
FIG. 9 is a schematic diagram of pulse distribution for switching a circuit switching tube in four voltage intervals according to the present invention;
FIG. 10 (1) is a circuit voltage u of the present invention ab A waveform diagram;
FIG. 10 (2) shows the input voltage u at the AC side of the circuit of the present invention g And current i g A waveform diagram;
FIG. 10 (3) shows the DC output voltage u of the circuit of the present invention dc A waveform diagram;
FIG. 11 (1) shows the voltage u when the load increases by 50% at 0.2 to 0.3s in the circuit of the present invention ab A waveform diagram;
FIG. 11 (2) shows the AC side input voltage u when the load increases or decreases by 50% at 0.2 to 0.3s in the circuit of the present invention g And current i g A waveform diagram;
FIG. 11 (3) shows the DC output voltage u of the circuit of the present invention when the load increases or decreases by 50% at 0.2-0.3 s dc Waveform diagram.
Detailed Description
The circuit of the invention is specifically described below with reference to the accompanying drawings:
the detailed experimental parameters of the circuit are as follows:
AC power supply u g Input voltage is 220V, power frequency is 50Hz, inductance L 1 And L is equal to 2 The inductance values are 1.5mH and the capacitance C 1 、C 2 The capacitance values are 2200uF, the resistance value of the load R is 30Ω, and the output voltage at the DC side is 400V, wherein the switching frequency is 10KHz.
Fig. 1 is a topology structure diagram of a single-phase five-level rectifier based on four-port insertion:
from ac power supply u g Double-coupling magnetic winding N 1 And N 2 Capacitance C 1 And C 2 Switch tube Q 1 ～Q 3 Diode D 1 ～D 10 And a load R.
Double-coupling magnetic winding N 1 Comprising winding N 11 And N 12 The method comprises the steps of carrying out a first treatment on the surface of the The double-coupling magnetic winding comprises a winding N 21 And N 22 ；
In fig. 1, in a four-port plug-in based single-phase five-level rectifier:
AC power supply u g One end of diode D 1 Cathode, winding N of (a) 1 Together forming end point c;
AC power supply u g Is connected with the other end of diode D 2 Cathode, winding N of (a) 2 Is connected with one end of the connecting rod to form an end point d;
winding N 1 Is connected with the other end of diode D 3 Anode, switch tube Q of (2) 1 Is connected with the collector of the capacitor to form an endpoint a;
winding N 2 Is connected with the other end of diode D 4 Is connected with the anode to form an endpoint b;
diode D 4 Cathode, diode D of (2) 5 Anode, diode D of (c) 6 Is connected with the cathode of the electrode to form an end point e;
diode D 3 Cathode, diode D of (2) 7 Is connected with the cathode of the capacitor to form an endpoint f;
diode D 5 Cathode, diode D of (2) 7 Anode, diode D of (c) 8 Cathode of (d) switch tube Q 3 Is connected with the collector of the capacitor to form an endpoint g;
diode D 6 Anode, diode D of (c) 9 Anode, switch tube Q of (2) 3 Emitter, switch tube Q 2 Is connected with the collector electrode to form an endpoint h;
diode D 1 Anode, diode D of (c) 2 Anode, diode D of (c) 10 Cathode of (d) switch tube Q 1 Emitter, switch tube Q 2 Emitter connections of (a) to form an endpoint i;
capacitor C 1 The positive electrode of the load R is connected with one end of the load R to form an endpoint m, and the endpoint m is connected with an endpoint f;
diode D 8 Anode, diode D of (c) 9 Cathode, capacitor C of (2) 1 Negative electrode of (C) and capacitor C 2 Is connected with the positive electrode of the battery to form an endpoint o;
diode D 10 Anode, capacitance C of (C) 2 The negative electrode of (2) and the other end of the load R are connected to form an end point n.
Switch tube Q in circuit 1 、Q 2 、Q 3 The N-channel insulated gate bipolar transistor (N-IGBT) which is a body-free diode has the following six working modes by controlling the on-off state:
fig. 2 is a schematic diagram of a first working mode: AC power supply u g Operating in positive half cycle, switch tube Q 1 、Q 2 、Q 3 All off. At this time due to the DC output voltage u dc >|u g The voltage frequency of the input side of the power grid is far smaller than the operating frequency of a switch tube, so the winding current i g Linearly decreasing, capacitance C 1 、C 2 In a charged state, the charging current is i 1 -i dc Voltage u ab ＝+u dc 。
Fig. 3 shows a second mode of operation: AC power supply u g Operating in positive half cycle, switch tube Q 2 、Q 3 Conduction, Q 1 And (5) switching off. At this time, capacitor C 1 Charging with a charging current i 1 -i dc Winding N 1 The voltage is |u g |-u 1 If |u g |>u 1 The winding current i g Linearly increasing, and conversely linearly decreasing, capacitance C 2 Discharging provides a load current i dc Voltage u ab ＝+u dc /2。
Fig. 4 is a third mode of operation: AC power supply u g Operating in positive half cycle, switch tube Q 1 Conduction, Q 2 、Q 3 And (5) switching off. At this time, AC power supply u g To the energy-storage winding N 1 Charging, winding current i g In a linearly rising state, with capacitance C 1 And C 2 Supplying a load R with a voltage u ab ＝0。
Fig. 5 is a fourth mode of operation: AC power supply u g Operating in the negative half cycle, switch tube Q 1 Turn off, Q 2 、Q 3 Conducting. At this time, AC power supply u g To the energy-storage winding N 2 Charging, winding current i g Linearly rise while the capacitance C 1 、C 2 Supplying a load R with a voltage u ab ＝0。
Fig. 6 is a fifth mode of operation: AC power supply u g Operating in the negative half cycle, switch tube Q 1 、Q 2 Turn off, Q 3 Conducting. At this time, the capacitance C 2 Charging, the charging current is io-i dc Winding N 2 Upper voltage of |u g |-u 2 If |u g |>u 2 The winding current i g Linearly increasing, and conversely linearly decreasing, capacitance C 1 Supplying a load R with a voltage u ab ＝-u dc /2。
Fig. 7 is a working mode six: AC power supply u g Operating in the negative half cycle, switch tube Q 1 、Q 2 、Q 3 All off. At this time due to the DC output voltage u dc >|u g I, winding current i g Linearly decreasing, capacitance C 1 、C 2 Charging with a charging current i 1 -i dc Voltage u ab ＝-u dc 。
FIG. 8 shows a switching tube Q in the circuit of the present invention 1 ～Q 3 Six working mode diagrams: when u is g >The circuit operating in positive half-cycles at 0, u g <The circuit operates in the negative half-cycle at 0 and the voltage u between nodes a and b ab There are five total level states: 0. +u dc /2、-u dc /2、+u dc 、-u dc . The circuit parameters vary as shown, wherein 1 and 0 represent the on and off of the switching tube, respectively.
Fig. 9 is a diagram of the pulse distribution of the switching tube of the circuit of the present invention under PWM control:
the five level states can be divided into four voltage intervals according to voltage classes, namely:
interval one (+u) dc /2<u g <+u dc ) Interval two (0)<u g <+u dc /2), interval three (-u) dc /2<u g <0) Interval ofFour (-u) dc <u g <-u dc And 2) in any two level conversion periods, the switching states of the switching tubes are continuously switched to realize five levels by mutual coordination.
FIG. 10 (1) shows the voltage u in the circuit of the present invention ab Waveform diagram: the waveform shown in fig. 10 (1) is five-level, has four voltage intervals with equal upper and lower amplitudes, and has the function of balancing voltage due to the fact that two capacitors are equivalent, and the voltage stress of a switching tube is correspondingly reduced by 50%, so that the circuit has the function of realizing a five-level circuit.
FIG. 10 (2) shows the AC input side voltage u of the circuit of the present invention g And current i g Waveform diagram: as can be seen from fig. 10 (2), the network side input current i g Following the input voltage u by power factor correction g Compared with the traditional three-level rectifying circuit, the waveform sine has the advantages that the harmonic content is greatly reduced, and the electric energy conversion efficiency is further improved.
FIG. 10 (3) shows the DC output side voltage u of the circuit of the present invention dc Waveform diagram: the DC side output voltage shown in FIG. 10 (3) was stable at 400V at 0.05s, and the dynamic adjustment performance was good.
FIG. 11 (1) shows the voltage u when the load increases by 50% at 0.2 to 0.3s in the circuit of the present invention ab Waveform diagram: when the load of the circuit is halved at 0.2s, the load returns to the original value at 0.3s, as shown in FIG. 11 (1), voltage u ab The waveform has no obvious change, which indicates that the circuit of the invention has high working reliability.
FIG. 11 (2) shows the AC side input voltage u when the load increases or decreases by 50% at 0.2 to 0.3s in the circuit of the present invention g And current i g Waveform diagram: when the load is between 0.2s and 0.3s, the load changes, and the current i is input to the network side g And a voltage u g The same phase is still maintained, and the electric energy quality is better.
FIG. 11 (3) shows the DC output voltage u of the circuit of the present invention when the load increases or decreases by 50% at 0.2-0.3 s dc Waveform diagram: as shown in fig. 11 (3), the load changes in the range of 0.2s to 0.3s, the output voltage is still maintained at about 400V, and the circuit maintains stable dc output, and has a relatively stable boost rectifying function.
Claims (6)
1. Based on four-port plug-in single-phase five-level rectifier, its characterized in that includes:
double-coupling magnetic winding N 1 Double-coupling magnetic winding N 2 Capacitance C 1 Capacitance C 2 Switch tube Q 1 ～Q 3 Diode D 1 ～D 10 ；
AC power supply u g One end of diode D 1 Cathode, winding N of (a) 1 Is connected with one end of the connecting rod to form an end point c;
AC power supply u g Is connected with the other end of diode D 2 Cathode, winding N of (a) 2 Is connected with one end of the connecting rod to form an end point d;
winding N 1 Is connected with the other end of diode D 3 Anode, switch tube Q of (2) 1 Is connected with the collector of the capacitor to form an endpoint a;
winding N 2 Is connected with the other end of diode D 4 Is connected with the anode to form an endpoint b;
diode D 4 Cathode, diode D of (2) 5 Anode, diode D of (c) 6 Is connected with the cathode of the electrode to form an end point e;
diode D 3 Cathode, diode D of (2) 7 Is connected with the cathode of the capacitor to form an endpoint f;
diode D 5 Cathode, diode D of (2) 7 Anode, diode D of (c) 8 Cathode of (d) switch tube Q 3 Is connected with the collector of the capacitor to form an endpoint g;
diode D 6 Anode, diode D of (c) 9 Anode, switch tube Q of (2) 3 Emitter, switch tube Q 2 Is connected with the collector electrode to form an endpoint h;
diode D 1 Anode, diode D of (c) 2 Anode, diode D of (c) 10 Cathode of (d) switch tube Q 1 Emitter, switch tube Q 2 Emitter connections of (a) to form an endpoint i;
capacitor C 1 The positive electrode of the load R is connected with one end of the load R to form an endpoint m, and the endpoint m is connected with an endpoint f;
diode D 8 Anode, diode D of (c) 9 Cathode, capacitor C of (2) 1 Negative electrode of (C) and capacitor C 2 Is connected with the positive electrode of the battery to form an endpoint o;
diode D 10 Anode, capacitance C of (C) 2 The negative electrode of the load R is connected with the other end of the load R to form an endpoint n;
the terminals e, f, i and o in the rectifier form a four-port plug-in structure.
2. The four-port plug-in based single-phase five-level rectifier of claim 1, wherein: the double-coupling magnetic winding N 1 Comprising winding N 11 Winding N 12 Winding N 11 、N 21 Adopts common-core co-directional winding to form an inductor L 1 ；
Double-coupling magnetic winding N 2 Comprising winding N 21 Winding N 22 The method comprises the steps of carrying out a first treatment on the surface of the Winding N 12 、N 22 Adopts the common-core reverse winding to form the inductor L 2 ；
The turns of the two groups of windings are identical, the magnetic cores are completely matched, and the inductance values are equal.
3. The four-port plug-in based single-phase five-level rectifier of claim 1, wherein: the diode D 1 、D 2 Is a common diode; d (D) 3 ～D 10 Is a fast recovery diode, wherein diode D 4 、D 10 Serving as a voltage clamp.
4. The four-port plug-in based single-phase five-level rectifier of claim 1, wherein: the capacitor C 1 Capacitance C 2 All are equivalent electrolytic capacitors used for balancing midpoint potential of the direct current side.
5. The four-port plug-in based single-phase five-level rectifier of claim 1, wherein: the switch tube Q 1 ～Q 3 N-channel insulation of all body-free diodesGate bipolar transistor N-IGBT.
6. The four-port plug-in based single-phase five-level rectifier of any one of claims 1 to 5, wherein:
through a switching tube Q in a control circuit 1 、Q 2 、Q 3 The circuit has the following six working modes:
and a first working mode: AC power supply u g Operating in positive half cycle, switch tube Q 1 、Q 2 、Q 3 All turn off due to the DC output voltage u dc >|u g The voltage frequency of the input side of the power grid is far smaller than the operating frequency of a switch tube, so the winding current i g Linearly decreasing, capacitance C 1 、C 2 In a charged state, the charging current is i 1 -i dc Voltage u ab ＝+u dc ；
And a working mode II: AC power supply u g Operating in positive half cycle, switch tube Q 2 、Q 3 Conduction, Q 1 Turn off, at this time, capacitor C 1 Charging with a charging current i 1 -i dc Double-coupling magnetic winding N 1 The voltage is |u g |-u 1 If |u g |>u 1 The winding current i g Linearly increasing, and conversely linearly decreasing, capacitance C 2 Discharging provides a load current i dc Voltage u ab ＝+u dc /2；
And the working mode is three: AC power supply u g Operating in positive half cycle, switch tube Q 1 Conduction, Q 2 、Q 3 Turn off at this time the AC power supply u g Double-coupling magnetic winding N 1 Charging, winding current i g In a linearly rising state, with capacitance C 1 And C 2 Supplying a load R with a voltage u ab ＝0；
And the working mode is four: AC power supply u g Operating in the negative half cycle, switch tube Q 1 Turn off, Q 2 、Q 3 On, at this time, AC power supply u g Double-coupling magnetic winding N 2 Charging, winding current i g Linearly rise while the capacitance C 1 、C 2 Supplying a load R with a voltage u ab ＝0；
And a fifth working mode: AC power supply u g Operating in the negative half cycle, switch tube Q 1 、Q 2 Turn off, Q 3 On, at this time, capacitor C 2 Charging, the charging current is i o -i dc Double-coupling magnetic winding N 2 Upper voltage of |u g |-u 2 If |u g |>u 2 The winding current i g Linearly increasing, and conversely linearly decreasing, capacitance C 1 Supplying a load R with a voltage u ab ＝-u dc /2；
Working mode six: AC power supply u g Operating in the negative half cycle, switch tube Q 1 、Q 2 、Q 3 All turn off due to the DC output voltage u dc >|u g I, winding current i g Linearly decreasing, capacitance C 1 、C 2 Charging with a charging current i 1 -i dc Voltage u ab ＝-u dc 。
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