CN110061625B - Four-port converter with bipolar output and control method thereof - Google Patents
Four-port converter with bipolar output and control method thereof Download PDFInfo
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- CN110061625B CN110061625B CN201910383919.6A CN201910383919A CN110061625B CN 110061625 B CN110061625 B CN 110061625B CN 201910383919 A CN201910383919 A CN 201910383919A CN 110061625 B CN110061625 B CN 110061625B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a four-port converter with bipolar output. The input port comprises a DC power source V in1 And a DC power source V with charging and discharging functions in2 The output port includes a load R 1 And a load R 2 . The converter is operated in a dual-input dual-output mode or a single-input three-output mode by controlling the switching tube. In the dual input dual output mode, V in1 And V in2 At the same time be the load R 1 And a load R 2 Providing energy; in single input three output mode, V in1 For the load R 1 And a load R 2 Providing energy, V in2 Absorbing excess energy. The beneficial effects of the invention are as follows: simple structure, low cost, high power density and high system efficiency. The bipolar voltage which is symmetrical and commonly grounded can be output, and the three-voltage-class load can be connected, so that the application range is wide and the reliability is high. The voltage relationship between the input and output ports of the converter is flexible, and the converter can boost and buck.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a four-port converter with bipolar output and a control method thereof.
Background
In recent years, with the increase of environmental pollution and energy crisis, the use of new energy sources such as solar energy, hydrogen energy, wind energy and the like for power generation has become a hot spot for research. The new energy power generation system is divided into two operation modes of grid-connected operation and independent operation according to whether the new energy power generation system is connected with a power grid, and the independent operation new energy power generation system is widely applied to power supply of non-power grid areas such as remote mountain areas, islands, industrial parks and the like due to the advantages of simple structure, high power supply quality and the like. However, since the output characteristics of the new energy power generation system are often closely related to environmental factors, the output characteristics of the new energy power generation system have randomness and volatility under different environmental conditions, and therefore, an energy storage unit must be equipped in the new energy power generation system that operates independently to store and regulate electric energy, so as to meet the requirements of the electric load on power supply continuity and stability.
In order to further improve the efficiency of the system and reduce the cost of the system, researchers apply the multi-port converter to the new energy power generation system, however, the existing multi-port converter often only comprises a load end, only can provide a direct current bus with one voltage level, and cannot meet the requirement of simultaneously accessing a plurality of loads with different voltage levels into the system. Therefore, some scholars have proposed a new energy power generation system with bipolar output capable of simultaneously outputting symmetrical positive polarity voltage and negative polarity voltage. Compared with a single-polarity new energy power generation system, the bipolar new energy power generation system has the following advantages: 1) When one path of output cannot work normally, the other path of output can still work normally, and the system reliability is higher; 2) The current flowing through the ground wire is very small, and when the two loads are the same, the current flowing through the ground wire is 0; 3) When the load power is equal, the power transmitted on a single bus in the bipolar new energy power generation system is half of that of the unipolar new energy power generation system; 4) Can provide three voltage class outputs, and has wider application range. The traditional bipolar voltage output implementation mode adopts an isolated forward converter or flyback converter, and a transformer core is shared to perform multi-output winding on the transformer, so that bipolar output is realized, and the mode has the defects of complex design, large system size and low efficiency. Therefore, it is necessary to provide a bipolar new energy power generation system based on a non-isolated multi-port converter, so as to overcome the problems of large volume, high cost, low efficiency and the like in the prior art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a four-port converter with bipolar output. The converter can output symmetrical and commonly grounded bipolar voltages at the same time, and can realize that two power sources and a plurality of loads are simultaneously connected into a system by adopting one converter, and can realize energy management between the sources and the loads by corresponding control.
The technical scheme for realizing the purpose of the invention is as follows:
four-port converter with bipolar output, comprising a DC power source V in1 And a DC power source V with charging and discharging functions in2 ；V in1 Is connected to the anode of the inductor L 1 Input terminal L of (1) 1 Is connected to the switch tube S 1 Drain electrode of (C) and intermediate storage capacitor C x Positive electrode of C x Is connected to the negative electrode of the inductor L 2 And diode D 2 Anode of D 2 Is connected to a load R 1 Is provided; v (V) in1 Is a negative electrode of S 1 Source, L of (2) 2 Output of (2) and R 1 The outputs of which are all connected to a reference ground; and also comprises a third connecting part connected in parallel to V in1 Input filter capacitor C at two ends in1 And is connected in parallel to R 1 Output filter capacitor C at two ends 1 ；V in2 Is connected to diode D 3 Cathode of D 3 Is connected to the switch tube S 3 Source of S 3 Is connected to the intermediate energy storage capacitor C y Positive electrode of C y Is connected to diode D 4 Anode and inductance L of (2) 3 Input terminal of (2), inductance L 3 Is connected to the load R 2 Is provided; v (V) in2 Negative electrode of D 4 And R 2 The outputs of which are all connected to a reference ground; and also comprises a third connecting part connected in parallel to V in2 Input filter capacitor C at two ends in2 And is connected in parallel to R 2 Output filter capacitor C at two ends 2 The method comprises the steps of carrying out a first treatment on the surface of the Also comprises a diode D 1 And a switch tube S 2 ，D 1 Is connected to L 1 Input terminal D of (2) 1 Is connected to S 2 Source of S 2 Is connected to D 3 A cathode of (a); s is S 1 The drain of (2) is also connected to S 3 Is formed on the drain electrode of the transistor.
Further, it also includes a load R 3 ，R 3 Are respectively connected to R at both ends 1 And R is 2 Is provided.
The four areThe control method of the port converter is that the switching tube S is always turned off 3 The converter is operated in a dual-input dual-output mode; alternatively, the switching tube S is always turned off 2 The inverter is operated in a single-input three-output mode.
Compared with the prior art, the invention has the beneficial effects that:
1. simple structure, low cost, high power density and high system efficiency.
2. The bipolar voltage which is symmetrical and commonly grounded can be output, and the three-voltage-class load can be connected, so that the application range is wide and the reliability is high.
3. The voltage relationship between the input and output ports of the converter is flexible, and the converter can boost and buck.
Drawings
Fig. 1 is a schematic diagram of a four-port converter with bipolar output according to the present invention.
Fig. 2 is an equivalent circuit diagram of a dual input dual output mode.
Fig. 3 (a) and 3 (b) are two main operation waveforms in the dual input dual output mode, respectively.
Fig. 4 is an equivalent circuit diagram of the single input three output mode.
Fig. 5 is a main operation waveform in the single input three output mode.
Fig. 6 is a schematic diagram of a control method of a four-port converter with bipolar output.
Fig. 7 (a) and 7 (b) are two steady-state waveforms in the dual input dual output mode, respectively.
Fig. 8 is a steady state waveform in a single input three output mode.
Fig. 9 is a transient response waveform for load transitions in a dual input dual output mode.
Fig. 10 is a transient response waveform for load transitions in a single-input three-output mode.
Fig. 11 is a simulated waveform switching between a dual input dual output mode and a single input three output mode.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings.
Four-port converter with bipolar output, which converter can be connected to a first power source V simultaneously in1 Second power source V in2 And the load can output symmetrical and commonly grounded bipolar voltage, and the circuit device is few, the power density is high, and the application range is wide.
FIG. 1 shows a schematic circuit diagram of a four-port converter with bipolar output, comprising a first power source V in1 Second power source V in2 Positive polarity output port V o1 Negative polarity output port V o2 A first input filter capacitor C in1 A second input filter capacitor C in2 First intermediate energy storage capacitor C x Second intermediate energy storage capacitor C y First output filter capacitor C 1 A second output filter capacitor C 2 First inductance L 1 Second inductance L 2 Third inductance L 3 First switch tube S 1 Second switch tube S 2 Third switch tube S 3 First diode D 1 Second diode D 2 Third diode D 3 Fourth diode D 4 A first load R 1 A second load R 2 . In addition, a third load R can be added according to actual needs 3 。
Wherein the first power source V in1 Using a photovoltaic unit as input, a second power source V in2 Using an energy storage unit as input, a first load R 1 A second load R 2 And a third load R 3 All adopt pure resistance.
First power source V in1 Positive electrode of (a) and first inductance L 1 And a first diode D 1 The cathode of which is connected to the ground, the first inductance L 1 The other end of (a) is connected with a first switch tube S 1 And a first intermediate storage capacitor C x Is connected with the positive electrode of the first switch tube S 1 Is connected to the ground, a first intermediate storage capacitor C x Negative electrode of (2) and second inductance L 2 And a second diode D 2 Anode connection of the second inductance L 2 The other end of (B) is connected to the ground, the second diode D 2 Positive polarity output port V of the converter o1 And with a load R 1 Is connected to the positive electrode of the battery.
Second power source V in2 Is connected to the ground, the positive electrode and the second switch tube S 2 Drain of (D) and third diode D 3 Cathode connection of a second switching tube S 2 Source electrode of (C) and first diode D 1 Anode connection of third diode D 3 Anode of (c) and third switching tube S 3 Source connection of a third switch tube S 3 Drain electrode of (d) and first switch tube S 1 And a second intermediate energy storage capacitor C y Is connected with the positive electrode of the second intermediate energy storage capacitor C y Respectively with the negative pole of the fourth diode D 4 And a third inductance L 3 A fourth diode D connected to one end of 4 Is connected to the ground, a third inductance L 3 The other end of the output port V is used as a positive polarity output port of the converter o2 And with a load R 2 Is connected to the positive electrode of the battery.
If a third load R is provided in the system 3 Load R 3 Is connected to the load R at both ends thereof 1 And a load R 2 Is a positive electrode of (a).
First input filter capacitor C in1 And a second input filter capacitor C in2 The photovoltaic input port and the two ends of the input port of the energy storage unit are respectively connected in parallel; first output filter capacitor C 1 And a second output filter capacitor C 2 Connected in parallel to both ends of the positive polarity output port and the negative polarity output port, respectively.
In the system, a first power source V in1 May be various power sources capable of providing DC output, the second power source V in2 Various energy storage devices having charging and discharging functions are possible.
In particular, in order to realize strictly symmetrical bipolar output, the first inductance L needs to be ensured 1 Second inductance L 2 Third inductance L 3 All operate in inductive current continuous conduction mode (Continuous Conduction Mode, CCM), so，L 1 、L 2 、L 3 A larger inductance should be taken.
In order to realize strict symmetrical bipolar output, the first intermediate energy storage capacitor C is also required to be ensured x And a second intermediate energy storage capacitor C y Is substantially constant, so C x 、C y A larger capacitance should be taken.
In the dual-input dual-output mode, the third switching tube S 3 Always turn off, the first power source V in1 And a second power source V in2 Simultaneously, the system provides energy for the load unit, and in one switching period, the system comprises four switching states which are respectively: state 1 (S) 1 And S is 2 All conducting); state 2 (S) 1 Conduction, S 2 Shut off); state 3 (S) 1 Turn off, S 2 Conducting); state 4 (S) 1 And S is 2 All turned off), if S 1 On duty cycle d of (2) 1 Greater than S 2 On duty cycle d of (2) 2 Then in one switching period, the state 1, the state 2 and the state 4 are sequentially generated, if S 1 On duty cycle d of (2) 1 Less than S 2 On duty cycle d of (2) 2 Then states 1, 3, and 4 occur sequentially in one switching cycle.
In the single-input three-output mode, the second switching tube S 2 Always turn off only the first power source V in1 Providing energy to the load, a second power source V in2 The system absorbs redundant energy, and in one switching period, the system comprises three switching states, namely: state 1 (S) 1 Conduction, S 3 Shut off); state 2 (S) 1 Turn off, S 3 Conducting); state 3 (S) 1 And S is 3 All off).
Fig. 2 shows an equivalent circuit of a four-port converter with bipolar output in a dual-input dual-output mode. In the dual input dual output mode, photovoltaic unit V in1 And an energy storage unit V in2 At the same time, the switch tube S supplies energy to the load 3 And (5) constantly turning off.
FIG. 3 shows the primary operating wave of a four-port converter with bipolar output in dual-input dual-output modeShape, where d 1 Is a switching tube S 1 On duty cycle, d 2 Is a switching tube S 2 I is the on duty cycle of (i) L For flowing through inductance L 1 V of (2) L Is the inductance L 1 Voltage at both ends, V cx For the first intermediate energy-storage capacitor C x Voltage at both ends, V cy For the first intermediate energy-storage capacitor C y The voltage across it. In the dual-input dual-output mode, the converter may have two operating states, d 1 >d 2 And d 1 <d 2 As shown in fig. 3 (a) and 3 (b).
In the dual-input dual-output mode, according to the first inductance L 1 Second inductance L 2 Third inductance L 3 The volt-second equilibrium relationship of (d) can be obtained, whether d 1 >d 2 Or d 1 <d 2 Positive polarity output terminal voltage V o1 And negative polarity output terminal voltage V o2 The method comprises the following steps of:
as can be seen from the above, in the dual input dual output mode, the positive polarity output terminal voltage V o1 And negative polarity output terminal voltage V o2 Having the same amplitude and opposite voltage polarity, and when switching the tube S 1 On duty cycle d of (2) 1 When changing between 0 and 1, positive polarity terminal voltage V o1 Can change between 0 and positive zero group size, negative polarity terminal voltage V o2 Can vary between 0 and negative ungrouped. Therefore, the converter can realize both voltage boosting and voltage reducing in the dual-input dual-output mode.
Fig. 4 shows an equivalent circuit of a four-port converter with bipolar output in a single-input three-output mode. In the single-input three-output mode, only the photovoltaic unit supplies energy for the load, the energy storage unit absorbs the redundant energy generated by the photovoltaic unit, and the switch tube S 2 And (5) constantly turning off.
FIG. 5 shows a four port converter with bipolar output at a single inputA main operating waveform in a three output mode, where d 1 Is a switching tube S 1 On duty cycle, d 3 Is a switching tube S 3 I is the on duty cycle of (i) L For flowing through inductance L 1 V of (2) L Is the inductance L 1 Voltage at both ends, V cx For the first intermediate energy-storage capacitor C x Voltage at both ends, V cy For the first intermediate energy-storage capacitor C y The voltage across it.
In the single-input three-output mode, according to the first inductance L 1 Second inductance L 2 Third inductance L 3 The volt-second equilibrium relationship of (c) can result in the voltages at the positive polarity output and the negative polarity output being:
as can be seen from the above, in the single-input three-output mode, the voltages at the positive polarity output terminal and the negative polarity output terminal have the same amplitude and opposite voltage polarities, and when the switching tube S 1 And a switch tube S 3 D of the on-duty ratio of (d) 1 +d 3 When changing between 0 and 1, positive polarity terminal voltage V o1 Can change between 0 and positive zero group size, negative polarity terminal voltage V o2 Can vary between 0 and negative ungrouped. Therefore, the converter can realize both voltage boosting and voltage reducing in a single-input three-output mode.
Fig. 6 shows a control circuit for a four-port converter with bipolar output. The control circuit comprises a first power source controller, a second power source controller, an output voltage controller, a mode selection circuit and a pulse modulation circuit. In this example, the first power source controller implements maximum power point tracking (Maximum Power Point Tracking, MPPT) control by sampling the voltage V at the input of the photovoltaic unit in1 And current I in1 MPPT operation is carried out to obtain a control signal v e1 Thereby realizing the maximum power output of the photovoltaic; the second power source controller controls the voltage and current of the energy storage unit by sampling the two ends of the energy storage unitVoltage V in2 And charge-discharge current I in2 Comparing the stored energy with a preset threshold value, so that the energy storage unit realizes overcharge protection and overdischarge protection; the output voltage controller samples two paths of output voltages V o1 And V o2 Then calculate V ox ＝0.5*V o1 -0.5*V o2 And V is combined with ox With reference voltage V o_ref Comparing, thereby controlling the output voltage to be constant; the mode selection circuit is based on the output v of the output voltage controller oe To determine the mode of operation of the system, if v oe <0, the system operates in a dual output mode, if v oe >0, the system operates in a dual input mode; the pulse modulation circuit compares the output of the mode selection circuit with the sawtooth wave to generate a pulse signal to control the switching tube S 1 、S 2 And S is 3 Is turned on and off. It should be noted that the control circuit is not the only control circuit of the present invention.
Performing time domain simulation analysis on the system by using PSIM simulation software, wherein simulation parameters of the system are set as follows: c (C) in1 ＝C in2 ＝C 1 ＝C 2 470μF，C x ＝C y ＝1000μF，L 1 ＝L 2 ＝L 3 =330 μh, positive polarity output port voltage V o1 =24v, negative polarity output port voltage V o2 -24V, energy storage cell voltage V in2 =30v, switching frequency f s =100 kHz, and the system simulation results are shown in fig. 7 to 11.
FIG. 7 shows the switching drive signal and the inductance L of a four-port converter with bipolar output in a dual-input dual-output mode 1 Is the current i of (2) L And the voltage v across the inductor L Wherein FIG. 7 (a) is d 1 >d 2 Is shown in FIG. 7 (b) as d 1 <d 2 As can be seen from the figure, the simulation results are consistent with the theoretical analysis.
FIG. 8 shows the switching drive signal, inductance L, of a four-port converter with bipolar output in a single-input three-output mode 1 Is the current i of (2) L And the voltage v across the inductor L As can be seen from the figure, the simulation results are consistent with the theoretical analysis.
Fig. 9 is a transient response waveform of a load jump of the four-port converter with bipolar output in a dual-input dual-output mode, wherein the maximum output power of the photovoltaic is 75W, the photovoltaic module outputs at the maximum power at the initial moment, the load consumption power is 100W, the power provided by the energy storage unit is 25W, the load power is increased from 100W to 150W at 0.1s, the power provided by the energy storage unit is suddenly changed to 75W, the load power is reduced from 150W to 100W at 0.15s, and the system operation condition is consistent with the initial condition. As can be seen from the figure, both the positive polarity output terminal voltage and the negative polarity output terminal voltage remain constant when the load changes.
Fig. 10 is a transient response waveform of a load jump of the four-port converter with bipolar output in a single-input three-output mode, wherein the maximum output power of the photovoltaic is 125W, the photovoltaic module outputs at the maximum power at the initial moment, the load consumption power is 100W, the power absorbed by the energy storage unit is 25W, the load power is reduced from 100W to 50W at 0.1s, the power absorbed by the energy storage unit is suddenly changed to 75W, the load power is increased from 50W to 100W at 0.15s, and the system operation condition is consistent with the initial state. As can be seen from the figure, both the positive polarity output terminal voltage and the negative polarity output terminal voltage remain constant when the load changes.
Fig. 11 is a simulation waveform of a four-port converter with bipolar output switching between a single-input three-output mode and a dual-input dual-output mode, wherein at the initial time, the photovoltaic is output at a maximum power of 125W, the load consumption power is 100W, the power absorbed by an energy storage unit is 25W, the system is operated in the single-input three-output mode, the maximum output power of the photovoltaic is suddenly changed from 125W to 50W at 0.1s, the output power of the photovoltaic is greater than the power required by the load, in order to ensure the normal operation of the system, the system operation mode is switched to the dual-input dual-output mode, the power provided by the energy storage unit is 50W, the maximum output power of the photovoltaic is suddenly changed from 50W to 125W at 0.15s, and the system operation condition is consistent with the initial condition.
According to the theoretical analysis and simulation, the four-port converter with bipolar output has the advantages of simple structure, low cost, high power density and high system efficiency, can output symmetrical and commonly-grounded bipolar voltage, can be connected with loads of at least three voltage levels, has wide application range and high reliability, has few switching devices, can realize centralized control, ensures that the design of a control circuit is simpler, has flexible voltage relationship between input and output ports of the converter, and can boost and buck. The proposed converter thus has significant advantages over the prior art.
Claims (3)
1. Four-port converter with bipolar output, characterized by comprising a DC power source V in1 And a DC power source V with charging and discharging functions in2 ；
V in1 Is connected to the anode of the inductor L 1 Input terminal L of (1) 1 Is connected to the switch tube S 1 Drain electrode of (C) and intermediate storage capacitor C x Positive electrode of C x Is connected to the negative electrode of the inductor L 2 And diode D 2 Anode of D 2 Is connected to a load R 1 Is provided; v (V) in1 Is a negative electrode of S 1 Source, L of (2) 2 Output of (2) and R 1 The outputs of which are all connected to a reference ground; and also comprises a third connecting part connected in parallel to V in1 Input filter capacitor C at two ends in1 And is connected in parallel to R 1 Output filter capacitor C at two ends 1 ；
V in2 Is connected to diode D 3 Cathode of D 3 Is connected to the switch tube S 3 Source of S 3 Is connected to the intermediate energy storage capacitor C y Positive electrode of C y Is connected to diode D 4 Anode and inductance L of (2) 3 Input terminal of (2), inductance L 3 Is connected to the load R 2 Is provided; v (V) in2 Negative electrode of D 4 And R 2 The outputs of which are all connected to a reference ground; and also comprises a third connecting part connected in parallel to V in2 Input filter capacitor C at two ends in2 And is connected in parallel to R 2 Output filter capacitor C at two ends 2 ；
Also comprises a diode D 1 And a switch tube S 2 ，D 1 Is connected to L 1 Input terminal D of (2) 1 Is connected to S 2 Source of S 2 Is connected to D 3 A cathode of (a);
S 1 the drain of (2) is also connected to S 3 Is formed on the drain electrode of the transistor.
2. The four-port converter of claim 1 further comprising a load R 3 ，R 3 Are respectively connected to R at both ends 1 And R is 2 Is provided.
3. A control method of a four-port converter according to claim 1 or 2, characterized in that the switching tube S is always turned off 3 The converter is operated in a dual-input dual-output mode; alternatively, the switching tube S is always turned off 2 The inverter is operated in a single-input three-output mode.
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| CN107959435A (en) * | 2018-01-09 | 2018-04-24 | 青岛大学 | Power supply flyback cycle changing type single-stage multi input inverter while band energy storage device |
| CN209767386U (en) * | 2019-05-08 | 2019-12-10 | 西南交通大学 | Four-port converter with bipolar output |
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