CN109361323B - I-type three-level soft switching circuit and corresponding three-phase conversion circuit and converter - Google Patents

I-type three-level soft switching circuit and corresponding three-phase conversion circuit and converter Download PDF

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Publication number
CN109361323B
CN109361323B CN201811355319.0A CN201811355319A CN109361323B CN 109361323 B CN109361323 B CN 109361323B CN 201811355319 A CN201811355319 A CN 201811355319A CN 109361323 B CN109361323 B CN 109361323B
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terminal
switching
switching device
diode
capacitor
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CN109361323A (en
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黄文俊
易龙强
林伟民
叶永发
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XIAMEN KECAN INFORMATION TECHNOLOGY Co.,Ltd.
Kehua Data Co Ltd
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Xiamen Kecan Information Technology Co ltd
Xiamen Kehua Hengsheng Co Ltd
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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
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Rectifiers (AREA)

Abstract

The invention discloses an I-type three-level soft switching circuit, which comprises: four switching devices connected in series in sequence; the four switching devices respectively comprise a controllable switching tube and an anti-parallel diode; a second energy storage element; a first energy storage element; a first diode; a second diode; the first inductor is connected with the first end of the first energy storage element at the first end and connected with the anode of the first diode at the second end; a capacitive component; the capacitor part includes: a first capacitor having a first terminal connected to the second terminal of the first switching device and a second terminal connected to the second terminal of the second switching device; a second capacitor having a first terminal connected to the first terminal of the third switching device and a second terminal connected to the first terminal of the fourth switching device; or the capacitive component comprises: and the first end of the target capacitor is connected with the second end of the first switching device, and the second end of the target capacitor is connected with the first end of the fourth switching device. The invention also discloses a three-phase conversion circuit and a converter device, which have corresponding effects.

Description

I-type three-level soft switching circuit and corresponding three-phase conversion circuit and converter
Technical Field
The invention relates to the technical field of electric energy conversion, in particular to an I-type three-level soft switching circuit, a corresponding three-phase conversion circuit and a corresponding converter device.
Background
The I-type three-level conversion circuit has the advantages of small harmonic wave, high efficiency and the like, and is applied to various occasions. Referring to fig. 1, which is a schematic structural diagram of an I-type three-level conversion circuit in the prior art, a first switching device, a second switching device, a third switching device, and a fourth switching device are sequentially connected in series, a first end of the first switching device is connected to a positive bus, and a second end of the fourth switching device is connected to a negative bus.
The second terminal of the first switching device is connected with the first terminal of the second switching device, and the common terminal of the first switching device is connected with the first diode D1Is connected to the cathode. The second end of the third switching device is connected with the first end of the fourth switching device, and the common end of the third switching device is connected with the second diode D2Is connected with the anode of (2). A second terminal of the second switching device is connected to a first terminal of the third switching device, a common terminal thereof is used as a first output terminal of the circuit, and a first diode D1Anode of and a second diode D2And the common terminal of the cathode connection of (a) is taken as the second output terminal of the circuit, namely the neutral line of the circuit. The four switching devices each include a controllable switching tube and an anti-parallel diode, and specifically, the first switching device in fig. 1 includes a first controllable switching tube Q1And a first freewheeling diode Dq1The second switch device comprises a second controllable switch tube Q2And a first freewheeling diode Dq2The third switch device comprises a third controllable switch tube Q3And a third freewheeling diode Dq3The fourth switching device comprises a fourth controllable switching tube Q4And a fourth freewheeling diode Dq4。
In the I-type three-level conversion circuit, the power consumption of each controllable switching tube can be divided into on-state power consumption and on-off power consumption, and the on-off power consumption includes the power consumption of the controllable switching tube in an on stage and the power consumption of the controllable switching tube in an off stage. When the on-off consumption is too high, the efficiency loss of the controllable switch tube is large, the working frequency of the circuit is limited, and various problems such as electromagnetic interference, noise pollution, breakdown of a power device and the like are easy to occur. Therefore, it is important to realize soft switching of the circuit.
The soft switching means that a switching device can realize zero-voltage switching, zero-current switching, zero-voltage zero-current switching or the rise of voltage or current according to a limited speed in the switching process. In the existing partial scheme, 2 resonant capacitors and 1 resonant inductor are arranged on the basis of an I-type three-level conversion circuit, and each resonant capacitor is provided with a corresponding diode as a discharge path to realize soft switching, and because 4 diodes, 2 resonant capacitors and 1 resonant inductor are required to be configured, the number of required devices is large, so that the cost for realizing soft switching is high, and the reliability of the circuit is reduced.
In summary, how to implement soft switching of an I-type three-level conversion circuit, and effectively reduce the cost and improve the circuit reliability is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide an I-type three-level soft switching circuit, which is used for realizing soft switching of an I-type three-level conversion circuit, effectively reducing the cost and improving the reliability of the circuit.
In order to solve the technical problems, the invention provides the following technical scheme:
a type I three level soft switching circuit comprising:
the first end of the first energy storage element is connected with the first end of the first diode, the second end of the first energy storage element is connected with the first end of the second switch device, and the cathode of the first diode is connected with the first switch device;
the second switching device having a second terminal connected to the first terminal of the third switching device;
the second end of the third switching device is connected with the first end of the fourth switching device, and the anode of the second diode is connected with the third switching device;
the second end of the fourth switching device is connected with the second end of the second energy storage element;
the four switching devices respectively comprise a controllable switching tube and a diode, the cathode of the diode is connected with the first end of the controllable switching component and serves as the first end of the corresponding switching device, and the anode of the diode is connected with the second end of the controllable switching component and serves as the second end of the switching device;
the second energy storage element is connected with the second end of the first energy storage element at the first end;
the first energy storage element;
the first diode;
the second diode;
a first inductor having a first terminal connected to the second terminal of the first energy storage element and a second terminal connected to the anode of the first diode;
a capacitive component;
the capacitance component includes:
a first capacitor having a first terminal connected to the second terminal of the first switching device and a second terminal connected to the second terminal of the second switching device;
a second capacitor having a first terminal connected to the first terminal of the third switching device and a second terminal connected to the first terminal of the fourth switching device;
or the capacitive component comprises:
and the first end of the target capacitor is connected with the second end of the first switching device, and the second end of the target capacitor is connected with the first end of the fourth switching device.
Preferably, the first energy storage element is a third capacitor, a first end of the third capacitor is used as a first end of the first energy storage element, and a second end of the third capacitor is used as a second end of the first energy storage element.
Preferably, the second energy storage element is a fourth capacitor, a first end of the fourth capacitor is used as a first end of the second energy storage element, and a second end of the fourth capacitor is used as a second end of the second energy storage element.
Preferably, the first energy storage element is a first direct current source, and the second energy storage element is a second direct current source.
Preferably, the controllable switch tubes in the four switch devices are all IGBT tubes.
Preferably, the controllable switch tube in the four switch devices is a MOS tube without a body diode.
Preferably, the diodes in the four switching devices are all schottky diodes.
Preferably, the first switch device, the second switch device, the third switch device and the fourth switch device are MOS transistors with diodes.
A three-phase conversion circuit comprising: a first conversion circuit, a second conversion circuit, and a third conversion circuit;
neutral lines of the first converting circuit, the second converting circuit and the third converting circuit are connected to each other, and the first converting circuit, the second converting circuit and the third converting circuit each include any one of the type I three-level soft switching circuits described above.
A current transformation device comprises the I-type three-level soft switching circuit.
The technical scheme provided by the embodiment of the invention comprises the following steps: the first end of the first energy storage element is connected with the first end of the first diode, the second end of the first energy storage element is connected with the first end of the second switch device, and the cathode of the first diode is connected with the first switch device; a second switching device having a second terminal connected to the first terminal of the third switching device; the second end of the third switching device is connected with the first end of the fourth switching device, and the anode of the second diode is connected with the third switching device; a fourth switching device having a second terminal connected to the second terminal of the second energy storage element; the four switching devices respectively comprise a controllable switching tube and a diode, the cathode of the diode is connected with the first end of the controllable switching component and serves as the first end of the corresponding switching device, and the anode of the diode is connected with the second end of the controllable switching component and serves as the second end of the switching device; the first end of the second energy storage element is connected with the second end of the first energy storage element; a first energy storage element; a first diode; a second diode; the first inductor is connected with the first end of the first energy storage element at the first end and connected with the anode of the first diode at the second end; a capacitive component; the capacitor part includes: a first capacitor having a first terminal connected to the second terminal of the first switching device and a second terminal connected to the second terminal of the second switching device; a second capacitor having a first terminal connected to the first terminal of the third switching device and a second terminal connected to the first terminal of the fourth switching device; or the capacitive component comprises: and the first end of the target capacitor is connected with the second end of the first switching device, and the second end of the target capacitor is connected with the first end of the fourth switching device.
In the scheme of this application, soft switching can all be realized to each controllable switching device and diode to, the scheme of this application only needs on original three level conversion circuit's of I type basis, increases first inductance and electric capacity part, and electric capacity part includes a target capacitance, perhaps includes first electric capacity and second electric capacity, and required device is small in quantity, has reduced the cost effectively, has improved the circuit reliability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an I-type three-level conversion circuit in the prior art;
FIG. 2 is a schematic diagram of a type I three level soft switching circuit according to the present invention;
FIG. 3 is another schematic diagram of an I-type three-level soft switching circuit according to the present invention;
FIG. 4 shows a first controllable switch Q with a positive half cycle of the AC output voltage according to an embodiment of the present invention1Before turn-off, the second capacitor C2Working schematic diagram during charging;
FIG. 5 shows an embodiment of the present invention in which the AC output voltage is a positive half cycle and the first controllable switch Q is turned on1Off, second capacitance C2Working schematic diagram during discharging;
FIG. 6 shows an embodiment of the present invention in which the AC output voltage is a positive half cycle and the second capacitor C2After the discharge is over, the first diode D1Working schematic before conduction;
FIG. 7 shows an embodiment of the present invention in which the AC output voltage is a positive half cycle and the first diode D1A working schematic diagram during conduction;
FIG. 8 shows a first controllable switch Q with a positive half cycle of the AC output voltage according to an embodiment of the present invention1Before the conduction, the current of the first inductor L reaches the working schematic diagram of the current of the alternating current output side;
FIG. 9 shows a first controllable switch Q with a positive half cycle of the AC output voltage according to an embodiment of the present invention1Conducting the first diode D1A working schematic diagram during conduction;
FIG. 10 shows a fourth controllable switch Q with a negative half-cycle of the AC output voltage according to an embodiment of the present invention4Before turn-off, the first capacitor C1Working schematic diagram during charging;
FIG. 11 shows a fourth controllable switch Q with a negative half-cycle of the AC output voltage according to an embodiment of the present invention4Off, the first capacitor C1Working schematic diagram during discharging;
FIG. 12 shows a first capacitor C with a negative half cycle of the AC output voltage according to an embodiment of the present invention1At the end of the discharge, the second diode D2A working schematic diagram before conduction;
FIG. 13 shows a second diode D with a negative half cycle of the AC output voltage according to an embodiment of the present invention2A working schematic diagram during conduction;
FIG. 14 shows a fourth controllable switch Q with a negative half-cycle of the AC output voltage according to an embodiment of the present invention4Before the conduction, the current of the first inductor L reaches the working schematic diagram of the current of the alternating current output side;
FIG. 15 shows a fourth controllable switch Q with a negative half-cycle of the AC output voltage according to an embodiment of the present invention4On, the second diode D2And (3) working schematic diagram when the LED is conducted.
Detailed Description
The core of the invention is to provide an I-type three-level soft switching circuit, which realizes soft switching, effectively reduces the cost and improves the reliability of the circuit.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 invention.
Referring to fig. 2 and fig. 3, fig. 2 is a schematic diagram of an I-type three-level soft switching circuit according to an embodiment of the present invention, in which a capacitor component is composed of a first capacitor C1And a second capacitor C2Fig. 3 is a schematic structural diagram of an I-type three-level soft switching circuit according to another embodiment of the present invention, in which the capacitor unit is formed by a target capacitor C.
The application provides a type I three level soft switch circuit includes:
a first terminal connected to the first terminal of the first energy storage element, a second terminal connected to the first terminal of the second switching device, and a first diode D1The cathodes of the first and second switching devices are connected;
a second switching device having a second terminal connected to the first terminal of the third switching device;
a second terminal, a first terminal of a fourth switching device, a second diode D2The anodes of the first and second switching devices are connected;
a fourth switching device having a second terminal connected to the second terminal of the second energy storage element;
the four switching devices each comprise a controllable switching tube and a diode, the cathode of the diode is connected with the first end of the controllable switching component to serve as the first end of the corresponding switching device, and the anode of the diode is connected with the second end of the controllable switching component to serve as the second end of the switching device.
For convenience of description, the controllable switch tube in the first switch device is referred to as the first controllable switch tube Q in this application1The first controllable switch Q in the first switch device1The antiparallel diode is called the first freewheeling diode Dq1Correspondingly, the second switching device includes a second controllable switching tube Q2And a second freewheeling diode Dq2The third switch device comprises a third controllable switch tube Q3And a third freewheeling diode Dq3The fourth switching device comprises a fourth controllable switching tube Q4And a fourth freewheeling diode Dq4。
In specific implementation, considering that an IGBT (Insulated Gate Bipolar Transistor) has the advantages of low conduction voltage drop, low driving power, high switching speed and the like, and is particularly suitable for occasions with high voltage levels, the controllable switch tubes in the four switch devices of the present application may be all IGBT tubes, that is, the first controllable switch tube Q1A second controllable switch tube Q2A third controllable switch tube Q3And a fourth controllable switch tube Q4May be all IGBT tubes. In this case, the collector of each IGBT serves as the first terminal of the IGBT, the emitter serves as the second terminal of the IGBT, and the gate serves as the control terminal to determine the on/off of the IGBT.
Of course, a Metal-Oxide-Semiconductor Field-Effect Transistor (mosfet) without a body diode may be selected as the controllable switch tube of the present application, for example, in an embodiment, all of the controllable switch tubes in the four switch devices are MOS tubes without a body diode. Compared with the IGBT, the MOS tube has lower cost. And the diodes in the four switching devices can be selected to have high recovery speed, so that the Schottky diode is suitable for high-frequency occasions. In addition, considering that a part of the MOS transistor is internally provided with a body diode, in the solution of the present application, the first switching device, the second switching device, the third switching device and the fourth switching device may be all MOS transistors provided with body diodes.
The first end of the second energy storage element is connected with the second end of the first energy storage element;
a first energy storage element;
first diode D1；
Second diode D2；
First energy storage element and second energy storage elementThe elements may be selected as capacitors, and the third capacitor C is shown in the embodiments of fig. 2 and 33And a fourth capacitance C4. In particular, the third capacitor C3As a first terminal of a first energy storage element, a third capacitor C3A second terminal of the first energy storage element, and a fourth capacitor C4As a first terminal of a second energy storage element, a fourth capacitor C4As a second end of the second energy storage element. When a capacitive solution is used, the third capacitor C3Is connected to the input of the circuit, and when the input is DC, the third capacitor C3I.e. to the positive pole of the dc input, and, correspondingly, a fourth capacitor C4The second terminal of which is connected to the negative pole of the dc input.
In one embodiment, the first energy storage element may be a first dc source, and the second energy storage element may be a second dc source. In consideration of the fact that when the capacitor is used as the first energy storage element and the second energy storage element, although the cost of the capacitor is low, the capacitor voltage may fluctuate in practical application, and further the output voltage of the circuit of the application is deviated, therefore, in the embodiment, the first direct current source is used as the first energy storage element, and the second direct current source is used as the second energy storage element, which is beneficial to reducing the fluctuation condition of the voltage. The dc source can be selected as a dc current source or a dc voltage source according to actual needs, and the implementation of the present invention is not affected.
A first end connected to the second end of the first energy storage element, and a second end connected to the first diode D1A first inductor L connected to the anode;
a capacitive component;
the capacitor part includes:
a first capacitor C having a first terminal connected to the second terminal of the first switching device and a second terminal connected to the second terminal of the second switching device1；
A second capacitor C having a first terminal connected to the first terminal of the third switching device and a second terminal connected to the first terminal of the fourth switching device2；
Or the capacitive component comprises:
and the first end of the target capacitor C is connected with the second end of the first switching device, and the second end of the target capacitor C is connected with the first end of the fourth switching device.
The following describes a commutation process of the circuit provided by the present application, taking the embodiment of fig. 2 as an example, that is, the capacitor component includes the first capacitor C1And a second capacitor C2For example, when the capacitor component includes the target capacitor C, the principle is the same and will not be described again.
Referring to fig. 4, fig. 4 shows the first controllable switch Q with the positive half cycle of the ac output voltage1Before turn-off, the second capacitor C2And (5) working schematic diagram during charging. Specifically, the positive bus passes through a first controllable switch tube Q1 and a second controllable switch tube Q2For the second capacitor C2Charging is carried out, and when the direct current input voltage is represented as Vdc, the second capacitor C2After the charging is finished, the voltage is Vdc. When the second capacitor C is used due to the existence of the first inductor L2When charging to Vdc, the second diode D2Is turned off in the reverse direction and is turned off at a limited current change rate so that the second diode D2The switching losses during the turn-off process are very low.
Referring to fig. 5, fig. 5 shows the first controllable switch Q with the positive half cycle of the ac output voltage1Off, second capacitance C2Working schematic diagram during discharging. At this time, the second controllable switch tube Q2A fourth controllable switch tube Q kept in a conducting state4Keeping the cut-off state, the first controllable switch tube Q1From the on-state to the off-state and by means of a third controllable switching transistor Q3Dead time not yet switched on versus second capacitance C2And discharging is performed. First controllable switch tube Q1During the transition from the on-state to the off-state, the voltage starts from zero and builds up with a limited voltage change rate, so that the first controllable switch Q is turned on1Zero voltage turn-off can be achieved. Moreover, the second capacitor C is adopted in the scheme of the application2When discharging, the fourth freewheeling diode D is usedq4And no additional discharge loop is needed.
With reference to figure 6 of the drawings,FIG. 6 shows a positive half cycle of the AC output voltage with the second capacitor C2After the discharge is over, the first diode D1Working schematic diagram before conducting. In particular, when the second capacitor C is used2After the discharge is finished, the third freewheeling diode Dq3And a fourth freewheeling diode Dq4The freewheeling conduction is started. At this time, the third controllable switch tube Q3When the second capacitor C2 is discharged, the third controllable switch tube Q is switched from the off state to the on state3The voltage at two ends is clamped, and a third controllable switch tube Q is realized3The zero voltage of (2) turns on.
Referring to fig. 7, fig. 7 shows the first diode D with the positive half cycle of the ac output voltage1And (3) working schematic diagram when the LED is conducted. First diode D1On, the current of the first inductor L increases linearly from zero, and at the same time, the third freewheeling diode Dq3And a fourth freewheeling diode Dq4Until the current is reduced to zero, the commutation process is completed, at which time the third freewheeling diode Dq3And a fourth freewheeling diode Dq4And (6) cutting off. In this process, the third freewheeling diode D is gradually increased from zero due to the presence of the first inductor L, and the current cannot abruptly changeq3Fourth freewheeling diode Dq4First diode D1And a second controllable switch tube Q2The current change rate of the switch is limited, and the switch works in a soft switching state.
Referring to fig. 8, fig. 8 shows the first controllable switch Q with the positive half cycle of the ac output voltage1Before the conduction, the current of the first inductor L reaches the working schematic diagram of the current of the alternating current output side. Specifically, the first controllable switch Q is set at this time1And a fourth controllable switch tube Q4In the off state, the second controllable switch tube Q2And a third controllable switch tube Q3Is in a conducting state. Because the third controllable switch tube Q at this moment3Without current passing through it, the current passes from the first inductor L through the first diode D1And a second controllable switch tube Q2For supplying power to a load, and a first capacitor C1And a second capacitor C2A zero voltage discharge state.
Referring to fig. 9, fig. 9 shows the first controllable switch Q with the positive half cycle of the ac output voltage1Conducting the first diode D1And (3) working schematic diagram when the LED is conducted. In particular, with the first controllable switch Q1The positive bus of the connection passes through a first controllable switch tube Q1And a first diode D1The first inductor L is applied with back voltage, the current of the first inductor L is linearly reduced, and meanwhile, the positive bus also passes through the first controllable switch tube Q1And a second controllable switch tube Q2The load is supplied with power, and the first diode D reduces the current of the first inductor L to zero1And (6) cutting off. In the process, the first controllable switch tube Q1When the load is switched from off to on, the first inductor L supplies power to the load current, so that the current flows through the first controllable switch tube Q1Has a zero current and a limited rate of change of the current, thereby realizing the first controllable switch tube Q1The zero current of (2) is turned on. And the third controllable switch tube Q3In the process of switching from on to off, the voltage between the two ends of the capacitor is controlled by the second capacitor C2Clamping, and no current passing through the third controllable switch tube Q3Therefore, the third controllable switch tube Q3Zero voltage, zero current turn-off is achieved.
The foregoing embodiments have described the ac output voltage in detail for the positive half cycle, and the operation of the circuit is similar to that for the negative half cycle, which can be referred to as the positive half cycle. Referring to fig. 10, in fig. 10, the ac output voltage is in a negative half period, and the fourth controllable switch Q4Before turn-off, the first capacitor C1And (5) working schematic diagram during charging. FIG. 11 shows a fourth controllable switch Q with a negative half-cycle of the AC output voltage4Off, the first capacitor C1Working schematic diagram during discharging. A first capacitor C1After the charging is finished, the fourth controllable switch tube Q can be realized4The zero voltage of (c) is off. A first capacitor C1At the second controllable switch tube Q2The dead time before the switch-on is used for discharging, since the first freewheeling diode D is usedq1Therefore, no extra discharge path is needed.
FIG. 12 shows a negative half cycle of the AC output voltage with the first capacitor C1At the end of the discharge, the second diode D2And working schematic before conduction. FIG. 13 shows a second diode D with a negative half cycle of the AC output voltage2And (3) working schematic diagram when the LED is conducted. A first capacitor C1After the discharge is over, the first freewheeling diode Dq1And a second freewheeling diode Dq2Start follow current conduction due to the second controllable switch tube Q2Is clamped, the second controllable switch tube Q is realized2The zero voltage of (2) turns on. And the first inductor L is arranged so that the first freewheeling diode Dq1Second freewheeling diode Dq2And a second diode D2The current change rate of the switch is limited, and the switch works in a soft switching state.
FIG. 14 shows a fourth controllable switch Q with a negative half cycle of the AC output voltage4Before the conduction, the current of the first inductor L reaches the working schematic diagram of the current of the alternating current output side. FIG. 15 shows a fourth controllable switch Q with a negative half cycle of the AC output voltage4On, the second diode D2And (3) working schematic diagram when the LED is conducted. Second controllable switch tube Q2In the process of switching from on to off, the voltage between the two ends of the capacitor is controlled by the first capacitor C1Clamping, and no current passing through the second controllable switch tube Q2Thus, the second controllable switch tube Q2Zero voltage, zero current turn-off is achieved. And the fourth controllable switch tube Q4When the load is switched from off to on, the first inductor L supplies power to the load current, so that the current flows through the fourth controllable switch tube Q4Has a zero current and a limited rate of change of the current, thereby realizing the fourth controllable switch tube Q4The zero current of (2) is turned on.
It should be noted that, in the foregoing embodiment, the circuit of the present application is described as operating in an inversion state, and the scheme of the present application may also be used for performing rectification, and also may implement soft switching of each device in the circuit, which is not described herein again.
The technical scheme provided by the embodiment of the invention comprises the following steps: the first end of the first energy storage element is connected with the first end of the first diode, the second end of the first energy storage element is connected with the first end of the second switch device, and the cathode of the first diode is connected with the first switch device; a second switching device having a second terminal connected to the first terminal of the third switching device; the second end of the third switching device is connected with the first end of the fourth switching device, and the anode of the second diode is connected with the third switching device; a fourth switching device having a second terminal connected to the second terminal of the second energy storage element; the four switching devices respectively comprise a controllable switching tube and a diode, the cathode of the diode is connected with the first end of the controllable switching component and serves as the first end of the corresponding switching device, and the anode of the diode is connected with the second end of the controllable switching component and serves as the second end of the switching device; the first end of the second energy storage element is connected with the second end of the first energy storage element; a first energy storage element; a first diode; a second diode; the first inductor is connected with the first end of the first energy storage element at the first end and connected with the anode of the first diode at the second end; a capacitive component; the capacitor part includes: a first capacitor having a first terminal connected to the second terminal of the first switching device and a second terminal connected to the second terminal of the second switching device; a second capacitor having a first terminal connected to the first terminal of the third switching device and a second terminal connected to the first terminal of the fourth switching device; or the capacitive component comprises: and the first end of the target capacitor is connected with the second end of the first switching device, and the second end of the target capacitor is connected with the first end of the fourth switching device.
In the scheme of this application, soft switching can all be realized to each controllable switching device and diode to, the scheme of this application only needs on original three level conversion circuit's of I type basis, increases first inductance and electric capacity part, and electric capacity part includes a target capacitance, perhaps includes first electric capacity and second electric capacity, and required device is small in quantity, has reduced the cost effectively, has improved the circuit reliability.
Compared with the aforementioned type I three-level soft switching circuit, the present application also provides a three-phase conversion circuit, which may include: a first conversion circuit, a second conversion circuit, and a third conversion circuit; the neutral lines of the first converting circuit, the second converting circuit and the third converting circuit are connected to each other, and the first converting circuit, the second converting circuit and the third converting circuit may include the type I three-level soft switching circuit in any of the embodiments. In the three-phase conversion circuit, the first conversion circuit, the second conversion circuit and the third conversion circuit may share the same first energy storage element and the same second energy storage element, or may have respective corresponding energy storage elements, without affecting the implementation of the present invention.
The invention also provides a converter device which can comprise the I-type three-level soft switching circuit in any embodiment and can be referred to correspondingly with the above.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The principle and the implementation of the present invention are explained in the present application by using specific examples, and the above description of the embodiments is only used to help understanding the technical solution and the core idea of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (10)

1. A type I, three level soft switching circuit, comprising:
the first end of the first energy storage element is connected with the first end of the first diode, the second end of the first energy storage element is connected with the first end of the second switch device, and the cathode of the first diode is connected with the first switch device;
the second switching device having a second terminal connected to the first terminal of the third switching device;
the second end of the third switching device is connected with the first end of the fourth switching device, and the anode of the second diode is connected with the third switching device;
the second end of the fourth switching device is connected with the second end of the second energy storage element;
the four switching devices respectively comprise a controllable switching tube and a diode, the cathode of the diode is connected with the first end of the controllable switching tube and serves as the first end of the corresponding switching device, and the anode of the diode is connected with the second end of the controllable switching tube and serves as the second end of the switching device;
the second energy storage element is connected with the second end of the first energy storage element at the first end;
the first energy storage element;
the first diode;
the second diode;
the first inductor is connected with the second end of the first energy storage element at the first end, and the second end of the first inductor is connected with the anode of the first diode and the cathode of the second diode;
a capacitive component;
the capacitance component includes:
a first capacitor having a first terminal connected to the second terminal of the first switching device and a second terminal connected to the second terminal of the second switching device;
a second capacitor having a first terminal connected to the first terminal of the third switching device and a second terminal connected to the first terminal of the fourth switching device;
or the capacitive component comprises:
and the first end of the target capacitor is connected with the second end of the first switching device, and the second end of the target capacitor is connected with the first end of the fourth switching device.
2. The type I three-level soft switching circuit according to claim 1, wherein the first energy storage element is a third capacitor, a first terminal of the third capacitor is used as the first terminal of the first energy storage element, and a second terminal of the third capacitor is used as the second terminal of the first energy storage element.
3. The type I three-level soft switching circuit according to claim 2, wherein the second energy storage element is a fourth capacitor, a first terminal of the fourth capacitor is used as the first terminal of the second energy storage element, and a second terminal of the fourth capacitor is used as the second terminal of the second energy storage element.
4. The type I three-level soft switching circuit of claim 1, wherein the first energy storage element is a first dc source and the second energy storage element is a second dc source.
5. The type I three-level soft switching circuit according to claim 1, wherein the controllable switching transistors of the four switching devices are all IGBT transistors.
6. A type I three-level soft switching circuit according to claim 1, characterized in that the controllable switching transistors of the four switching devices are MOS transistors without body diodes.
7. A type I three-level soft switching circuit according to claim 5 or 6, characterized in that the diodes in the four switching devices are all Schottky diodes.
8. A type I three-level soft switching circuit as recited in claim 1, wherein said first switching device, said second switching device, said third switching device and said fourth switching device are MOS transistors with diodes.
9. A three-phase inverter circuit, comprising: a first conversion circuit, a second conversion circuit, and a third conversion circuit;
neutral lines of the first converting circuit, the second converting circuit and the third converting circuit are connected to each other, and the first converting circuit, the second converting circuit and the third converting circuit each include the type I three-level soft switching circuit according to any one of claims 1 to 8.
10. A current transforming device comprising a type I three level soft switching circuit as claimed in any one of claims 1 to 8.
CN201811355319.0A 2018-11-14 2018-11-14 I-type three-level soft switching circuit and corresponding three-phase conversion circuit and converter Active CN109361323B (en)

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