CN217183185U - Buck-Boost AC-AC converter - Google Patents

Buck-Boost AC-AC converter Download PDF

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Publication number
CN217183185U
CN217183185U CN202123265631.0U CN202123265631U CN217183185U CN 217183185 U CN217183185 U CN 217183185U CN 202123265631 U CN202123265631 U CN 202123265631U CN 217183185 U CN217183185 U CN 217183185U
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switch
diode
capacitor
tube
anode
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陈景文
刘涛
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Shaanxi University of Science and Technology
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Shaanxi University of Science and Technology
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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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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Abstract

A Buck-Boost AC-AC converter comprises an input end and an output end, and comprises a first inductorL 1 A second inductorL 2 A first capacitorc 1 A second capacitorc 2 A third capacitorc 3 A fourth capacitorc 4 8 switching tubes and 8 diodes; the input terminal, the DC power source Vin and the first capacitorc 1 A second capacitorc 2 The branches after the series connection are connected in parallel, and the output end can be provided with a resistance load or a resistance and inductance load; the converter adopts an external fast recovery diode to realize free flow of current by closing a body diode, thereby reducing the reverse direction of a switch tube used by a circuitThe circuit has the advantages that the recovery loss is reduced, the MOS tube is used as the switching tube and the external fast recovery diode to achieve high efficiency, breakdown and dead zone consideration are avoided in the circuit, the reliability is high, the circuit can be simply achieved, conventional communication control is not needed, and the complexity of control is reduced.

Description

Buck-Boost AC-AC converter
Technical Field
The utility model belongs to the technical field of power electronics, concretely relates to Buck-Boost AC-AC converter.
Background
The conventional direct ac-ac converter has a simple structure. However, there are phase commutation problems caused by short and open circuit problems, which make its practical use more difficult. With the development of power electronic technology, in order to avoid the inrush current and huge voltage peak generated by a switching tube, a soft commutation technology is adopted. Which controls the power switch according to the polarity of the input voltage. And an external sensing module is adopted for polarity detection, so that the cost and the control complexity of the converter are increased. Furthermore, a resistor-capacitor buffer is connected to the switch, which allows a small dead time for the switching signal to avoid breakdown. Switched capacitor ac-ac converters are commonly used to generate higher or lower output voltages without magnetic components. However, its voltage gain is constant. For z-source ac-to-ac converters, they provide buck-boost operation. However, the higher voltage and current stresses of its main components reduce efficiency. There are also commutation problems associated with conventional ac-ac converters.
Conventional inverting buck-boost converters may produce an output voltage that is greater or less than the input voltage. However, it has several significant disadvantages. I.e. the input current and the output current are discontinuous, the voltage stress of the switch is large. At the same time, the inductor current and ripple are also higher.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model provides a Buck-Boost AC-AC converter, which is designed together with a Mosfet, so that the Buck-Boost AC-AC converter can use high switching frequency, not only keeps the functions of the traditional AC-AC converter, but also reduces the volume and the cost of the converter, and realizes high efficiency and high power density operation. The problems of breakdown and dead time of the switching tube are eliminated, and safe phase change can be realized without adopting a conventional method.
In order to achieve the above object, the utility model adopts the following technical scheme: a Buck-Boost AC-AC converter comprises an AC power source Vin and a first inductor L 1 A second inductor L 2 A first capacitor c 1 A second capacitor c 2 A third capacitor c 3 A fourth capacitor c 4 8 switching tubes and 8 diodes;
the input end, an alternating current power source Vin and a first capacitor c 1 A second capacitor c 2 The branches in series are connected in parallel; second diode D 2 The cathode and the anode of the first switch tube S are respectively connected with the first switch tube S 1 Third switch tube S 3 The source electrodes of the two-way transistor are connected; fourth diode D 4 Anode and third switch tube S 3 The drain electrodes of the two electrodes are connected; first diode D 1 Cathode and first switch tube S 1 Is connected to the drain electrode of the first diode D 1 And a second switch tube S 2 Is connected with the drain electrode of the second switch tube, and the source electrode of the second switch tube is connected with the third diode D 3 Is connected to the anode of a third diode D 3 The cathode of the first switching tube is connected with the source electrode of the fourth switching tube S 4 And the fourth diode D 4 The cathodes of the two electrodes are connected; a first capacitor C 1 And a second capacitor C 2 And a second diode D 2 Is connected to the anode of a second diode D 2 Anode of (2) and a third diode D 3 The anodes of the anode groups are connected;
sixth diode D 6 The cathode and the anode of the first switch tube are respectively connected with the fifth switch tube S 5 The source electrode of the seventh switching tube S7 is connected; eighth diode D 8 Anode and seventh switching tube S 7 The drain electrodes of the two electrodes are connected; fifth diode D 5 Cathode and fifth switch tube S 5 Is connected to the drain of the fifth diode D 5 Anode and sixth switching tube S 6 Is connected with the drain electrode of the sixth switching tube S 6 Source electrode of and seventh diode D 7 Is connected to the anode of a seventh diode D 7 And the eighth switching tube S 8 Is connected with the source electrode of the eighth switching tube S 8 And the eighth diode D 8 The cathodes of the two electrodes are connected; third capacitor C 3 And a fourth capacitor C 4 And a sixth diode D 6 Is connected to the anode of a sixth diode D 6 Anode of and seventh diode D 7 The anodes of the anode groups are connected;
first switch tube S 1 Through a first inductor L 1 And a fifth diode D 5 Are connected with each other; a second switch tube S 2 And the drain electrode of the second diode D 6 The cathodes of the two electrodes are connected; third switch tube S 3 Drain electrode of (1) and (seventh)Diode D 7 The cathodes of the two electrodes are connected; the third capacitor and the fourth capacitor are connected in series and then connected with a load, and the load can be a resistance load or a resistance and inductance load.
The first diode D 1 A second diode D 2 A third diode D 3 A fourth diode D 4 A fifth diode D 5 A sixth diode D 6 The seventh diode D 7 An eighth diode D 8 Are all fast recovery diodes.
The second switch tube S 2 The drain electrode and the source electrode of the diode are respectively connected with the anode and the cathode of the two fast recovery diodes;
third switch tube S 3 The drain electrode and the source electrode of the diode are respectively connected with the anode and the cathode of the two fast recovery diodes; sixth switching tube S 6 The drain electrode and the source electrode of the diode are respectively connected with the anode and the cathode of the two fast recovery diodes; seventh switching tube S 7 The drain and the source of the diode are respectively connected with the anode and the cathode of the two fast recovery diodes.
The first switch S 1 A second switch S 2 And a third switch S 3 And a fourth switch S 4 The fifth switch S 5 And a sixth switch S 6 Seventh switch S 7 The eighth switch S 8 Are all MOS tube switches.
The first switch S 1 A second switch S 2 And a third switch S 3 And a fourth switch S 4 The fifth switch S 5 And a sixth switch S 6 Seventh switch S 7 The eighth switch S 8 Are provided with diodes connected in parallel and capacitors connected in parallel.
The first switch S 1 A second switch S 2 And a third switch S 3 And a fourth switch S 4 The fifth switch S 5 And a sixth switch S 6 Seventh switch S 7 The eighth switch S 8 Are all above their cut-off frequency.
The first inductor L 1 And a second inductor L 2 Have the same inductance value.
The first inductor L 1 And a second inductor L 2 Have the same inductance value.
The novel Buck-Boost AC-AC converter is provided. The switching of the switching tube enables the circuit to realize buck operation and boost operation on alternating current.
The utility model has the advantages that:
compared with the prior art, the utility model discloses a non-contravariant alternating current converter, this converter utilize the Mosfet to realize high efficiency and reliability as the switch tube to eliminate the problem of short circuit and opening a way in topological structure. The positive and negative gains of the voltage can be used to suppress the fluctuation of the line voltage. The output voltage of the converter can be larger or smaller than the input voltage, the output voltage can be adjusted in a wide input voltage range, the control can be realized without adopting conventional special phase change control, and the control complexity is greatly reduced.
The topology utilizes the advantages of the Mosfet and the external fast recovery diode, greatly reduces power loss, realizes high efficiency, avoids dead time problem, reduces reverse recovery loss of the diode, and greatly improves the stability of a power converter system.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Fig. 2 is an equivalent circuit diagram of eight operation modes 1 of the present invention.
Fig. 3 is an equivalent circuit diagram of eight operation modes 2 of the present invention.
Fig. 4 is an equivalent circuit diagram of eight operation modes 3 of the present invention.
Fig. 5 is an equivalent circuit diagram of eight operation modes 4 of the present invention.
Fig. 6 is an equivalent circuit diagram of eight operation modes 5 of the present invention.
Fig. 7 is an equivalent circuit diagram of eight operation modes 6 of the present invention.
Fig. 8 is an equivalent circuit diagram of eight operation modes 7 of the present invention.
Fig. 9 is an equivalent circuit diagram of eight operation modes 8 of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and specific examples. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the utility model provides a Buck-Boost AC-AC converter has realized that output voltage can adjust at wide input voltage within range to reduced power loss, reduced the complexity of control. Referring to fig. 1, the Buck-Boost AC-AC converter comprises an AC power source Vin and a first inductor L 1 A second inductor L 2 A first capacitor c 1 A second capacitor c 2 A third capacitor c 3 A fourth capacitor c 4 8 switching tubes and 8 diodes.
Specifically, the input terminal, the ac power source Vin and the first capacitor c 1 A second capacitor c 2 The branches connected in series are connected in parallel; second diode D 2 The cathode and the anode of the first switch tube S are respectively connected with the first switch tube S 1 Third switch tube S 3 The source electrodes of the two-way transistor are connected; fourth diode D 4 Anode and third switch tube S 3 The drain electrodes of the two electrodes are connected; first diode D 1 Cathode and first switch tube S 1 Is connected to the drain electrode of the first diode D 1 Anode of and the second switch tube S 2 Is connected with the drain electrode of the second switch tube, and the source electrode of the second switch tube is connected with the third diode D 3 Is connected to the anode of a third diode D 3 The cathode of the first switching tube is connected with the source electrode of the fourth switching tube S 4 And the fourth diode D 4 The cathodes of the two electrodes are connected; a first capacitor C 1 And a second capacitor C 2 And a second diode D 2 Is connected to the anode of a second diode D 2 Anode of and a third diode D 3 The anodes of the anode groups are connected;
in particular, the sixth diode D 6 The cathode and the anode of the first switch tube are respectively connected with the fifth switch tube S 5 The source electrode of the seventh switching tube S7 is connected; eighth diode D 8 Anode and seventh switching tube S 7 The drain electrodes of the two electrodes are connected; fifth diode D 5 Cathode and fifth switch tube S 5 Is connected to the drain of the fifth diode D 5 Anode and sixth switching tube S 6 Is connected with the drain electrode of the sixth switching tube S 6 Source electrode of and seventh diode D 7 Is connected to the anode of a seventh diode D 7 Cathode and eighth switching tube S 8 Is connected with the source electrode of the eighth switching tube S 8 And the eighth diode D 8 The cathodes of the two electrodes are connected; third capacitor C 3 And a fourth capacitor C 4 And a sixth diode D 6 Is connected to the anode of a sixth diode D 6 Anode of and seventh diode D 7 The anodes of the anode groups are connected;
in particular, a first switching tube S 1 Through a first inductor L 1 And a fifth diode D 5 The anodes of the anode groups are connected; a second switch tube S 2 And the drain electrode of the second diode D 6 Is connected with the cathode; third switch tube S 3 Drain electrode of and a seventh diode D 7 Is connected with the cathode; the third capacitor and the fourth capacitor are connected in series and then connected with a load, and the load can be a resistance load or a resistance and inductance load.
Preferably, the first diode D 1 A second diode D 2 A third diode D 3 A fourth diode D 4 A fifth diode D 5 A sixth diode D 6 The seventh diode D 7 An eighth diode D 8 Are all fast recovery diodes.
It can be understood that the external diode with good reverse recovery characteristic and small forward voltage drop is adopted to provide circulation for the inductive current, so that the reverse recovery problem and the energy loss of the current can be reduced, and the switching tube can operate at higher frequency
Specifically, the second switch tube S 2 The drain electrode and the source electrode of the diode are respectively connected with the anode and the cathode of the two fast recovery diodes(ii) a Third switch tube S 3 The drain electrode and the source electrode of the diode are respectively connected with the anode and the cathode of the two fast recovery diodes; sixth switching tube S 6 The drain electrode and the source electrode of the diode are respectively connected with the anode and the cathode of the two fast recovery diodes; seventh switching tube S 7 The drain and the source of the diode are respectively connected with the anode and the cathode of the two fast recovery diodes.
Preferably, the first switch S 1 A second switch S 2 And a third switch S 3 And a fourth switch S 4 The fifth switch S 5 And a sixth switch S 6 Seventh switch S 7 The eighth switch S 8 Are all MOS tube switches.
Preferably, the first switch S 1 A second switch S 2 And a third switch S 3 And a fourth switch S 4 The fifth switch S 5 And a sixth switch S 6 Seventh switch S 7 The eighth switch S 8 Are provided with diodes connected in parallel and capacitors connected in parallel.
Preferably, the first switch S 1 A second switch S 2 And a third switch S 3 And a fourth switch S 4 The fifth switch S 5 And a sixth switch S 6 Seventh switch S 7 The eighth switch S 8 Are all above their cut-off frequency.
Preferably, the first inductor L1 and the second inductor L2 have the same inductance value.
It can be understood that in the proposed single-phase non-inverting BUCK-BOOST circuit, two switching tubes are connected to two anti-series external diodes in each branch to prevent the switching tubes from being broken down during current commutation, and the first inductor L 1 A second inductor L 2 The diode is used for storing energy, preventing the switch tube from being broken down and preventing current from flowing through the body diode of the Mos switch tube. A first capacitor C 1 A second capacitor C 2 A third capacitor C 3 And a fourth capacitor C 4 For providing a freewheeling path for inductor current during undesirable dead times in the mos switch tube switching signal. A first capacitor C 1 A second capacitor C 2 A third capacitor C 3 And a fourth capacitor C 4 And also as a filter to reduce ripple of the input and output currents and the switching frequency voltage. The Buck-Boost AC-AC converter does not have the problems of voltage breakdown and dead time, so that safe phase change can be realized without using a soft phase change technology and a large number of lossy buffers.
Specifically, the novel Buck-Boost AC-AC converter enables a circuit to work in four working states of resistive load discrete step-down operation, resistive load discrete step-up operation, resistive load Buck-Boost operation and resistive load step-down operation through on-off control of a switching tube, and each working state has two working modes, specifically including eight working modes. In all operating modes, the current through the MOSFET switch tube flows from the drain to the source and the current cannot flow in the reverse direction through the body diode.
Referring to fig. 2 to 9, the Buck-Boost AC-AC converter of the present embodiment includes eight operating modes.
Mode 1 resistive load discrete buck mode of operation I, in which the first switch s is switched on 1 And a fourth switch s 4 The eighth switch s 8 A second diode D 2 A fifth diode D 5 Conducting, none of the remaining switches and diodes conducting, and the first inductor L1 stores energy. The mode 1 circuit is shown in fig. 2.
Mode 2 resistive load discrete buck mode of operation II, in which the second switch s is switched on 2 And a third switch s 3 The eighth switch s 8 A fifth diode D 4 A fifth diode D 5 On and the remaining switches and diodes are all off. First inductance L 1 Discharging to the load R. The mode 2 circuit is shown in fig. 3.
Mode 3 resistive load discrete boost mode of operation I, in which the first switch s is turned on 1 And a sixth switch s 6 Seventh switch s 7 A fourth diode D 4 The seventh diode D 7 The first inductor L is switched on, the rest switches and the diodes are switched off 1 Energy is stored. The mode 3 circuit is shown in fig. 4.
Mode 4:resistive load discrete boost mode of operation II in which the first switch s is switched on 1 The fifth switch s 5 The eighth switch s 8 A fourth diode D 4 A fifth diode D 5 The first inductor L is switched on, the rest switches and the diodes are switched off 1 Releasing the stored energy output. The mode 4 circuit is shown in fig. 5.
Mode 5: a resistive load buck-boost operating mode I in which the first switch s is switched on 1 And a fourth switch s 4 And a sixth switch s 6 Seventh switch s 7 A fourth diode D 4 The seventh diode D 7 On and the remaining switches and diodes are all off. The mode 5 circuit is shown in fig. 6.
Mode 6: mode II of operation of the resistive load buck-boost, in which mode the second switch s 2 And a third switch s 3 The fifth switch s 5 The eighth switch s 8 A fourth diode D 4 A fifth diode D 5 On and the remaining switches and diodes are all off. The mode 6 circuit is shown in fig. 7.
Mode 7: step-down mode of operation I for resistive load, in which the first switch s is switched on 1 And a fourth switch s 4 The fifth switch s 5 The eighth switch s 8 A first diode D 1 An eighth diode D 8 On and the remaining switches and diodes are all off. The mode 7 circuit is shown in fig. 8.
Mode 8: step-down mode of operation II for resistive load, in which mode the second switch s 2 And a third switch s 3 The fifth switch s 5 The eighth switch s 8 A third diode D 3 An eighth diode D 8 On and the remaining switches and diodes are all off. The mode 8 circuit is shown in fig. 9.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims (7)

1. A Buck-Boost AC-AC converter is characterized by comprising an AC power source Vin and a first inductorL 1 A second inductorL 2 A first capacitorc 1 A second capacitorc 2 A third capacitorc 3 A fourth capacitorc 4 8 switching tubes, 8 diodes and an input end;
the input end, the alternating current power source Vin and the first capacitorc 1 A second capacitorc 2 The branches in series are connected in parallel; second diodeD 2 The cathode and the anode of the first switch tube are respectively connected with the first switch tubeS 1 Third switch tubeS 3 The source electrodes of the two-way transistor are connected; fourth diodeD 4 Anode and third switch tubeS 3 The drain electrodes of the two electrodes are connected; first diodeD 1 Cathode and first switch tubeS 1 Is connected to the drain electrode of the first diodeD 1 Anode and second switch tubeS 2 Is connected with the drain electrode of the second switch tube, and the source electrode of the second switch tube is connected with the third diodeD 3 Is connected to the anode of a third diodeD 3 The cathode of the first switch tube is connected with the source electrode of the second switch tube, and the second switch tubeS 4 Drain electrode of and fourth diodeD 4 The cathodes of the two electrodes are connected; first capacitorC 1 And a second capacitorC 2 And a second diodeD 2 Is connected to the anode of a second diodeD 2 Anode of and a third diodeD 3 The anodes of the anode groups are connected;
sixth diodeD 6 The cathode and the anode of the first switch tube are respectively connected with the fifth switch tubeS 5 The source electrode of the seventh switching tube S7 is connected; eighth diodeD 8 Anode and seventh switching tubeS 7 The drain electrodes of the two transistors are connected; fifth diodeD 5 Cathode and the firstFive-switch tubeS 5 Is connected to the drain of the fifth diodeD 5 Anode and sixth switching tubeS 6 Is connected with the drain electrode of the sixth switching tubeS 6 Source electrode of and seventh diodeD 7 Is connected to the anode of a seventh diodeD 7 Cathode and eighth switching tubeS 8 Is connected with the source electrode of the eighth switching tubeS 8 Drain electrode of and eighth diodeD 8 The cathodes of the two electrodes are connected; third capacitorC 3 And a fourth capacitorC 4 Midpoint and sixth diodeD 6 Is connected to the anode of a sixth diodeD 6 Anode of and seventh diodeD 7 Are connected with each other;
first switch tubeS 1 Through a first inductorL 1 And a fifth diodeD 5 Are connected with each other; second switch tubeS 2 Drain electrode of and the sixth diodeD 6 The cathodes of the two electrodes are connected; third switch tubeS 3 Drain electrode of and seventh diodeD 7 The cathodes of the two electrodes are connected; the third capacitor and the fourth capacitor are connected in series and then connected with a load, and the load can be a resistance load or a resistance and inductance load.
2. A Buck-Boost AC-AC converter as claimed in claim 1, wherein the first diode is connected to the first diodeD 1 A second diodeD 2 The third diodeD 3 The fourth diodeD 4 The fifth diodeD 5 The sixth diodeD 6 The seventh diodeD 7 The eighth diodeD 8 Are all fast recovery diodes.
3. A Buck-Boost AC-AC converter as claimed in claim 1, wherein the second switching transistor is arranged to switch between a first state and a second stateS 2 The drain electrode and the source electrode of the diode are respectively connected with the anode and the cathode of the two fast recovery diodes; third switch tubeS 3 Respectively with two fast recoveryThe anode and the cathode of the complex diode are connected; sixth switching tubeS 6 The drain electrode and the source electrode of the diode are respectively connected with the anode and the cathode of the two fast recovery diodes; seventh switch tubeS 7 The drain and the source of the diode are respectively connected with the anode and the cathode of the two fast recovery diodes.
4. A Buck-Boost AC-AC converter as claimed in claim 2, wherein the first switch is arranged to switch on the first side of the dc-AC converterS 1 A second switchS 2 The third switchS 3 And a fourth switchS 4 The fifth switchS 5 The sixth switchS 6 Seventh switchS 7 The eighth switchS 8 Are all MOS tube switches.
5. A Buck-Boost AC-AC converter as claimed in claim 4, characterised in that said first switchS 1 A second switchS 2 The third switchS 3 And a fourth switchS 4 The fifth switchS 5 And a sixth switchS 6 Seventh switchS 7 The eighth switchS 8 Are provided with diodes connected in parallel and capacitors connected in parallel.
6. A Buck-Boost AC-AC converter as claimed in claim 4, characterised in that said first switchS 1 A second switchS 2 The third switchS 3 And a fourth switchS 4 The fifth switchS 5 The sixth switchS 6 Seventh switchS 7 The eighth switchS 8 Are all above their cut-off frequency.
7. A Buck-Boo according to claim 1st AC-AC converter, characterized in that said first inductanceL 1 And a second inductorL 2 Have the same inductance value.
CN202123265631.0U 2021-12-23 2021-12-23 Buck-Boost AC-AC converter Expired - Fee Related CN217183185U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202123265631.0U CN217183185U (en) 2021-12-23 2021-12-23 Buck-Boost AC-AC converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202123265631.0U CN217183185U (en) 2021-12-23 2021-12-23 Buck-Boost AC-AC converter

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