CN210041650U

CN210041650U - Non-isolated high-gain three-port converter

Info

Publication number: CN210041650U
Application number: CN201920686853.3U
Authority: CN
Inventors: 詹跃东; 刘琦
Original assignee: Kunming University of Science and Technology
Current assignee: Kunming University of Science and Technology
Priority date: 2019-05-14
Filing date: 2019-05-14
Publication date: 2020-02-07
Anticipated expiration: 2029-05-14

Abstract

The utility model discloses a non-isolated form high-gain three-port converter, including input source, first switch tube, second switch tube, third switch tube, fourth switch tube, first diode, second diode, third diode, fourth diode, fifth diode, energy memory, first energy storage inductance, second energy storage inductance, switched capacitor, output filter capacitor and load. The utility model discloses have four kinds of mode, can realize the energy conversion between input source, energy memory, the load, it is parallelly connected through two way boosts to realize input port and two-way input output port's integration, realize the high gain through series connection switch electric capacity in the Boost branch road, realize dual output mode through introducing battery charging circuit, control is simple, can realize centralized control, work efficiency is high, be applicable to new forms of energy power generation systems such as solar energy, fuel cell.

Description

Non-isolated high-gain three-port converter

Technical Field

The utility model relates to a non-isolated form high-gain three-port converter belongs to power electronic converter field.

Background

With the increasing decrease of non-renewable energy sources, the development and utilization of new energy sources (solar energy, wind energy, hydrogen energy, etc.) are receiving wide attention. Due to the influence of environmental factors, the new energy source has the defects of intermittency and instability, and cannot meet the requirement that the load needs stable energy supply, so that an energy storage device (such as a storage battery and a super capacitor) needs to be introduced to balance energy transmission between the new energy source and the load. The traditional method for connecting the new energy source, the energy storage device and the load is to connect the new energy source, the energy storage device and the load by adopting a plurality of single-input single-output converters, and the circuit formed by the method has the disadvantages of complex topology, more switching devices and low efficiency. Therefore, a three-port converter having the advantages of compact topological structure, multiplexing of a switching device, high efficiency and the like is concerned, and particularly, a non-isolated three-port converter is widely applied because the topological structure is more compact, the control is simple and the efficiency is higher on occasions where electrical isolation is not needed. Since the voltage level generated by the new energy is often lower than the voltage level required by the load, it is important to research an effective method for improving the voltage gain of the non-isolated three-port converter without the isolation transformer. In recent years, the application of the switched capacitor in a non-isolated high-gain three-port converter is receiving wide attention.

At present, various non-isolated high-gain three-port converters have been proposed. A document named 'A Dual-input Central Capacitor DC/DC Converter for Distributed photo technical Architectures' (Chen Mengxing; Gao Feng; Li Ruishing, IEEE Transactions on Industrial applications,2017,53(1): 305) constructs a non-isolated high-gain three-port Converter by sharing a switch Capacitor through two-way Buck-Boost inputs. Although the circuit topology is compact, the improvement of voltage gain and switching device voltage stress is not ideal and cannot be operated in dual output mode. The other document named as a multi-path input high-Boost converter (China Motor engineering journal, 2012,32(3):9-14) constructs a non-isolated high-gain three-port converter by connecting two Boost input circuits in parallel and connecting a switched capacitor in an original Boost topological branch. Although the voltage gain and the voltage stress of the switching device are effectively improved, the dual-output mode cannot be operated.

Disclosure of Invention

In order to overcome the defect that the voltage gain of the existing non-isolated three-port converter is small and the converter cannot work in a double-output mode, the utility model provides a non-isolated high-gain three-port converter.

The technical scheme of the utility model is that: a non-isolated high-gain three-port converter comprises an input source V_inA first switch tube Q₁A second switch tube Q₂And a third switching tube Q₃And a fourth switching tube Q₄A first diode D₁A second diode D₂A third diode D₃A fourth diode D₄A fifth diode D₅Energy storage device V_bA first energy storage inductor L₁A second energy storage inductor L₂And a switch capacitor C₁An output filter capacitor C₂And a load R₀(ii) a Wherein: first energy storage inductor L₁And an input source V_inPositive electrode of (1), first switch tube Q₁Is connected with the drain electrode of the first energy storage inductor L₁The other end and a third diode D₃Anode of (2), fourth diode D₄Anode and fourth switching tube Q₄The drain electrodes of the two electrodes are connected; fourth diode D₄And a switched capacitor C₁Positive electrode of (2), fifth diode D₅The anodes of the anode groups are connected; fifth diode D₅Cathode and output filter capacitor C₂Positive electrode and load R₀The positive ends of the two are connected; second energy storage inductor L₂And a first switching tube Q₁Source electrode of, the first diode D₁Is connected with the cathode of the second energy storage inductor L₂And a second diode D₂Anode and third switching tube Q₃Drain electrode of (1), and switch capacitor C₁The negative electrodes are connected; second switch tube Q₂Source electrode and first diode D₁Anode, energy storage device V_bIs connected with the positive pole of the second switch tube Q₂And a second diode D₂Cathode of (2), third diode D₃The cathodes of the two electrodes are connected; input source V_inNegative electrode and energy storage device V_inNegative electrode of (1), third switching tube Q₃Source electrode and fourth switching tube Q₄Source electrode, output filter capacitor C₂Negative electrode and load R₀Is connected to the negative terminal.

The utility model has the advantages that: the utility model discloses have four kinds of mode, can realize the energy conversion between input source, energy memory, the load, it is parallelly connected through two way boosts to realize input port and two-way input output port's integration, realize the high gain through series connection switch electric capacity in the Boost branch road, realize dual output mode through introducing battery charging circuit, control is simple, can realize centralized control, work efficiency is high, be applicable to new forms of energy power generation systems such as solar energy, fuel cell.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention;

fig. 2-5 are equivalent circuit diagrams of each working mode and control signal diagrams of each switching tube when the converter of the present invention operates in a dual input mode;

fig. 6-9 are equivalent circuit diagrams of various working modes and control signals of various switching tubes when the converter of the present invention operates in the input source only mode;

fig. 10-13 are equivalent circuit diagrams of the working modes of the converter and control signals of the switching tubes when the converter operates in the energy storage device input mode only;

fig. 14-19 are equivalent circuit diagrams of each operating mode and control signal diagrams of each switching tube when the converter of the present invention operates in dual output mode;

the reference numbers in the drawings: v_in-input source, Q₁-a first switching tube, Q₂-a second switching tube, Q₃-a third switching tube, Q₄-fourth switching tube, D₁First diode, D₂A second diode, D₃-a third diode, D₄A fourth diode, D₅A fifth diode, V_b-energy storage means, L₁A first energy storage inductance, L₂-a second energy storage inductance, C₁-switched capacitor, C₂-output filter capacitance, R₀-a load.

Detailed Description

Example 1: as shown in FIG. 1, a non-isolated high-gain three-port converter includes an input source V_inA first switch tube Q₁A second switch tube Q₂And a third switching tube Q₃And a fourth switching tube Q₄A first diode D₁A second diode D₂A third diodeD₃A fourth diode D₄A fifth diode D₅Energy storage device V_bA first energy storage inductor L₁A second energy storage inductor L₂And a switch capacitor C₁An output filter capacitor C₂And a load R₀(ii) a Wherein: first energy storage inductor L₁And an input source V_inPositive electrode of (1), first switch tube Q₁Is connected with the drain electrode of the first energy storage inductor L₁The other end and a third diode D₃Anode of (2), fourth diode D₄Anode and fourth switching tube Q₄The drain electrodes of the two electrodes are connected; fourth diode D₄And a switched capacitor C₁Positive electrode of (2), fifth diode D₅The anodes of the anode groups are connected; fifth diode D₅Cathode and output filter capacitor C₂Positive electrode and load R₀The positive ends of the two are connected; second energy storage inductor L₂And a first switching tube Q₁Source electrode of, the first diode D₁Is connected with the cathode of the second energy storage inductor L₂And a second diode D₂Anode and third switching tube Q₃Drain electrode of (1), and switch capacitor C₁The negative electrodes are connected; second switch tube Q₂Source electrode and first diode D₁Anode, energy storage device V_bIs connected with the positive pole of the second switch tube Q₂And a second diode D₂Cathode of (2), third diode D₃The cathodes of the two electrodes are connected; input source V_inNegative electrode and energy storage device V_inNegative electrode of (1), third switching tube Q₃Source electrode and fourth switching tube Q₄Source electrode, output filter capacitor C₂Negative electrode and load R₀Is connected to the negative terminal.

When the non-isolated high-gain three-port converter works in a double-input mode, the third switching tube Q₃And a fourth switching tube Q₄The same frequency is complemented and conducted, and a third switching tube Q₃Duty ratio of D₁<0.5, fourth switch tube Q₄Duty ratio of D₂0.5, third switch tube Q₃The turn-on time corresponds to the fourth switch tube Q₄At the moment of turn-off, the first switch tube Q₁A second switch tube Q₂Is always in an off state by adjusting a third switching tube Q₃And a fourth switching tube Q₄Control the input source V_inAnd an energy storage device V_inThe output power of (1).

The non-isolated high-gain three-port converter works only in an input source V_inIn input mode, the third switch tube Q₃And a fourth switching tube Q₄The same frequency complementary centrosymmetric conduction is realized, the duty ratios are D, and D>0.5, first switch tube Q₁Is always in a conducting state, and the second switch tube Q₂Is always in an off state by adjusting a third switching tube Q₃And a fourth switching tube Q₄Control the input source V_inThe output power of (1).

The non-isolated high-gain three-port converter works in the energy storage device V only_bIn input mode, the third switch tube Q₃And a fourth switching tube Q₄The same frequency complementary centrosymmetric conduction is realized, the duty ratios are D, and D>0.5, first switch tube Q₁A second switch tube Q₂Is always in an off state, the first switch tube Q₁The anti-parallel diode is always conducted, and the third switching tube Q is adjusted₃And a fourth switching tube Q₄Control the energy storage device V_inThe output power of (1).

When the non-isolated high-gain three-port converter works in a double-output mode, the third switching tube Q₃And a fourth switching tube Q₄The same frequency complementary centrosymmetric conduction is realized, and the duty ratios are D₁And D is₁<0.5, and 2D₁>0.5, second switch tube Q₂The conduction time respectively corresponds to the third switch tube Q₃And a fourth switching tube Q₄At the moment of turn-off with a duty cycle of D₂，D₂<0.5, and D₁+D₂>0.5, first switch tube Q₁Is always conducted through regulating the second switch tube Q₂And a third switching tube Q₃And a fourth switching tube Q₄Control the converter output power and the energy storage device V_bAnd (4) distribution of charging power.

When the utility model is changedThe converter works in a dual-input mode, equivalent circuit diagrams of all working modes are shown in fig. 2-4, and control signal diagrams of all switching tubes are shown in fig. 5. As shown in FIG. 5, 0 to t₀Time of day, switch tube Q₁、Q₂、Q₄Turn-off, switch tube Q₃Conducting, the equivalent circuit diagram corresponding to the working mode is shown in FIG. 2, and the input source V_inThrough diode D₄And a switching tube Q₃Form loop pair inductance L₁And a switched capacitor C₁Energy storage, energy storage device V_bThrough diode D₁And a switching tube Q₃Form loop pair inductance L₂Energy storage, capacitor C₂Discharging to a load R₀Energy supply; t is t₀～t₁Time of day, switch tube Q₁、Q₂、Q₃、Q₄All are turned off, the equivalent circuit diagram corresponding to the working mode is shown in figure 3, and the input source V_inAnd an inductance L₁Through diode D₄、D₅Form a loop to supply energy to the load and to the capacitor C₂Charging and energy-storing device V_bInductor L₂And a switched capacitor C₂Through diode D₁、D₅Form a loop to supply energy to the load and to the capacitor C₂Charging; t is t₁～t₂Time of day, switch tube Q₁、Q₂、Q₃Turn-off, switch tube Q₄Conducting, the equivalent circuit diagram corresponding to the working mode is shown in FIG. 4, and the input source V_inThrough a switching tube Q₄Form a loop to the inductor L₁Energy storage, energy storage device V_bInductor L₂And a switched capacitor C₂Through diode D₁、D₅Form a loop to continuously supply power to the load and supply the capacitor C₂And (6) charging.

When the converter of the present invention operates in the input-only mode, the equivalent circuit diagrams of the respective operation modes are shown in fig. 6 to 8, and the control signal diagrams of the respective switching tubes are shown in fig. 9. 0 to t₀Time of day, switch tube Q₁、Q₃、Q₄Conducting, switching tube Q₂Turning off, the equivalent circuit diagram corresponding to the working mode is shown in FIG. 6, and the input source V_inThrough a switching tube Q₄Form loop pair inductance L₁Energy storage through a switching tube Q₁、Q₃Form loop pair inductance L₂Energy storage, capacitor C₂Discharging to supply energy to the load; t is t₀～t₁Time of day, switch tube Q₁、Q₃Conducting, switching tube Q₂、Q₄Turning off, the equivalent circuit diagram corresponding to the working mode is shown in FIG. 7, and the input source V_inThrough diode D₄And a switching tube Q₃Form loop pair inductance L₁Energy storage, to switching capacitor C₁Charging through a switch tube Q₁、Q₃Form a loop to continue to couple the inductor L₂Energy storage, capacitor C₂Discharging to continue to power the load; t is t₁～t₂At time, the working mode is 0-t₀The time is the same; t is t₂～t₃Time of day, switch tube Q₁、Q₄Conducting, switching tube Q₂、Q₃Turning off, the equivalent circuit diagram corresponding to the working mode is shown in FIG. 8, and the input source V_inThrough a switching tube Q₄Form a loop to the inductor L₁Energy storage through a switching tube Q₁And a diode D₅Form a loop with the same inductance L₂And a switched capacitor C₂Together power the load and supply the capacitor C₂And (6) charging.

When the converter of the present invention works in the input mode of only the energy storage device, the equivalent circuit diagram of each working mode is shown in fig. 10 to 12, and the control signal diagram of each switching tube is shown in fig. 13. The analysis of the operating mode at each time is similar to the example shown in fig. 6-9 and will not be described here.

When the converter of the present invention operates in the dual-output mode, the equivalent circuit diagram of each operating mode is shown in fig. 14 to 18, and the control signal diagram of each switching tube is shown in fig. 19. 0 to t₀Time of day, switch tube Q₁、Q₂、Q₃Conducting, switching tube Q₄Turning off, the equivalent circuit diagram corresponding to the working mode is shown in FIG. 14, and the input source V_inThrough diode D₃And a switching tube Q₂Form loop pair inductance L₁For storing energy, and for energy storage device V_bCharging through a switch tube Q₁、Q₃Form loop pair inductance L₂Energy storage, capacitor C₂Discharging to supply energy to the load; t is t₀～t₁Time of day, switch tube Q₁、Q₃Conducting, switching tube Q₂、Q₄Turning off, the equivalent circuit diagram corresponding to the working mode is shown in FIG. 15, and the input source V_inAnd an inductance L₁Through diode D₄And a switching tube Q₃Form a loop pair of switch capacitors C₁Charging through a switch tube Q₁、Q₃Form a loop to continue to couple the inductor L₂Energy storage, capacitor C₂Discharging to continue to power the load; t is t₁～t₂Time of day, switch tube Q₁、Q₂Conducting, switching tube Q₃、Q₄Turning off, the equivalent circuit diagram corresponding to the working mode is shown in FIG. 16, and the input source V_inThrough diode D3 and switching tube Q₂Form a loop to the inductor L₁For storing energy, and for energy storage device V_bCharging through a switch tube Q₁、Q₂And a diode D₂Form a loop to the inductor L₂For storing energy, and for energy storage device V_bCharging, capacitance C₂The discharge continues to power the load. t is t₂～t₃Time of day, switch tube Q₁、Q₂、Q₄Conducting, switching tube Q₃Turning off, the equivalent circuit diagram corresponding to the working mode is shown in FIG. 17, and the input source V_inThrough a switching tube Q₄Form a loop to the inductor L₁Energy storage through a switching tube Q₁、Q₂And a diode D₂Form a loop to the inductor L₂For storing energy, and for energy storage device V_bCharging, capacitance C₂The discharge continues to power the load. t is t₃～t₄Time of day, switch tube Q₁、Q₄Conducting, switching tube Q₂、Q₃Turning off, the equivalent circuit diagram corresponding to the working mode is shown in FIG. 18, and the input source V_inThrough a switching tube Q₄Form a loop to the inductor L₁Energy storage through a switching tube Q₁Diode D₅Form a loop while switching the capacitor C₁Discharge to the capacitor C₂Is charged with electricity, andand (4) supplying power to the load. t is t₄～t₅Working mode and t of time₁～t₂The time is the same.

While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims

1. A non-isolated high-gain three-port converter is characterized in that: comprises an input source (V)_in) A first switch tube (Q)₁) A second switch tube (Q)₂) And a third switching tube (Q)₃) And a fourth switching tube (Q)₄) A first diode (D)₁) A second diode (D)₂) A third diode (D)₃) A fourth diode (D)₄) A fifth diode (D)₅) And an energy storage device (V)_b) A first energy storage inductor (L)₁) A second energy storage inductor (L)₂) Switched capacitor (C)₁) An output filter capacitor (C)₂) And a load (R)₀) (ii) a Wherein: first energy storage inductor (L)₁) And an input source (V)_in) Positive electrode of (1), first switch tube (Q)₁) Is connected to the drain of the first energy storing inductor (L)₁) The other end and a third diode (D)₃) Anode of (D), fourth diode (D)₄) Anode of (2), fourth switching tube (Q)₄) The drain electrodes of the two electrodes are connected; fourth diode (D)₄) And a switched capacitor (C)₁) Positive electrode of (2), fifth diode (D)₅) The anodes of the anode groups are connected; fifth diode (D)₅) Cathode and output filter capacitor (C)₂) Positive electrode, load (R)₀) The positive ends of the two are connected; second energy storage inductor (L)₂) And a first switching tube (Q)₁) Source electrode, first diode (D)₁) Is connected to the cathode of the second energy storage inductor (L)₂) And a second diode (D)₂) Anode and third switching tube (Q)₃) Drain electrode of (2), and switch capacitor (C)₁) The negative electrodes are connected; second switch tube (Q)₂) Source and first diode (D)₁) Anode, energy storage device (V)_b) Is connected with the positive pole of the second switch tube (Q)₂) And a second diode (D)₂) Cathode of (D), third diode (D)₃) The cathodes of the two electrodes are connected; input source (V)_in) Negative electrode and energy storage device (V)_in) Negative electrode of (1), third switching tube (Q)₃) Source electrode, fourth switching tube (Q)₄) Source electrode, output filter capacitor (C)₂) Negative electrode, load (R)₀) Is connected to the negative terminal.