CN209516966U - A kind of single-phase non-isolated active clamp MOSFET inverter - Google Patents
A kind of single-phase non-isolated active clamp MOSFET inverter Download PDFInfo
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- CN209516966U CN209516966U CN201821626056.8U CN201821626056U CN209516966U CN 209516966 U CN209516966 U CN 209516966U CN 201821626056 U CN201821626056 U CN 201821626056U CN 209516966 U CN209516966 U CN 209516966U
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- 239000003990 capacitor Substances 0.000 claims abstract description 23
- 230000009471 action Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- 230000005764 inhibitory process Effects 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model provides a kind of single-phase non-isolated active clamp MOSFET inverter, including eight switching tubes, four diodes and two split capacitors, is suitable for photovoltaic generating system.Resonance phenomena that may be present can effectively be inhibited by the way that clamp circuit is added in H6 topology inverter, keep constant common-mode voltage, the utility model circuit can in effective solution inversion link as do not use transformer and caused by common mode current leakage, simultaneously because freewheeling period electric current is not passed through body diode, therefore MOSFET element can be used, reduce the turn-off power loss as caused by tail currents when as IGBT device shutdown, and SiC diode can substitute general-purpose diode, the available good inhibition of the loss of Reverse recovery.Therefore the utility model circuit can effectively inhibit common mode leakage current, while improve the efficiency of grid-connected system.
Description
Technical field
The utility model relates to photovoltaic combining inverter fields, and in particular to a kind of single-phase non-isolated active clamp MOSFET
Inverter.
Background technique
Solar energy cleanliness without any pollution is very important a kind of new energy.Due to the incident photon-to-electron conversion efficiency of photovoltaic solar plate
It is lower, therefore the efficiency for improving photovoltaic combining inverter is particularly important.The common gird-connected inverter with Industrial Frequency Transformer,
Since the presence meeting of transformer is so that the efficiency of system reduces, and increases the price of inverter, simultaneously because Industrial Frequency Transformer
Volume is larger, it is difficult to install.And the grid-connected system with high frequency transformer, one-stage transfor-mation device is increased, efficiency is also difficult to mention
It rises.Therefore to improve system effectiveness, generally use transformerless gird-connected inverter, due to transless so that power grid with it is inverse
Become device and there is direct electrical connection, when, there are when distribution capacity, full-bridge inverter can generate larger between solar panels and ground
Common mode leakage current, harm is generated to human body, and inverter may be damaged.Therefore to the research of non-isolation type inverter topology by
Extensive concern is arrived.The H5 type topology of German SMA company, can efficiently solve current leakage, but due to freewheeling period
Electric current flows through body diode, therefore HF switch pipe uses IGBT, IGBT to will cause biggish since there are tail currents
Turn-off power loss, the used time due to being pressed by the parasitic capacitance of device, due to device parameters and the difference of pcb board parasitic parameter
Can make that leakage current effect is inhibited to be deteriorated with resonant tank that may be present.
Utility model content
The purpose of the utility model is to overcome above-mentioned the deficiencies in the prior art, propose a kind of single-phase non-isolated active clamp
MOSFET inverter.
The single-phase non-isolated active clamp MOSFET inverter of one kind of the utility model, specifically includes a switching tube, second
Switching tube, third switching tube, the 4th switching tube, the 5th switching tube, the 6th switching tube, the 7th switching tube, the 8th switching tube, first
Diode, the second diode, third diode, the 4th diode, the first inductance, the second inductance, first capacitor, the second capacitor.
The specific connection type of foregoing circuit are as follows: the anode of DC bus and one end of first capacitor, first switch tube
Drain electrode is connected with the drain electrode of third switching tube.The drain electrode of one end of the other end of first capacitor and the second capacitor, the 7th switching tube
It is connected with the drain electrode of the 8th switching tube.The other end of the cathode of DC bus and the second capacitor, the source electrode of second switch and
The source electrode of four switching tubes connects.The drain electrode and first of the cathode, the 5th switching tube of the source electrode and first diode of first switch tube
One end of inductance connects.The other end of first inductance is connected with one end of power grid.The anode of first diode and the 7th switching tube
Source electrode connected with the cathode of third diode.The source electrode and second switch of the anode of third diode and the 6th switching tube
Drain electrode connection.The cathode of the source electrode of third switching tube and the second diode, the drain electrode of the 6th switching tube and the second inductance one end
Connection.The anode of second diode is connect with the cathode of the source electrode of the 8th switching tube and the 4th diode.The sun of 4th diode
Pole is connect with the drain electrode of the source electrode and the 4th switching tube of the 5th switching tube.The other end of second inductance is connect with the power grid other end.
Further, the switching tube is all made of the enhanced MOSFET of N-channel.
Further, the 7th switching tube and the 8th switching tube play clamping action, and first capacitor and the second capacitor's capacity are equal.
The utility model can effectively inhibit that may be present humorous by the way that clamp circuit is added in inverter (H6 topology)
Vibration phenomenon, keeps constant common-mode voltage.
Compared with prior art, the utility model circuit has the advantage that are as follows: can in effective solution inversion link by
In do not use transformer and caused by common mode current leakage, simultaneously because freewheeling period electric current is not passed through body diode, therefore
MOSFET element can be used, and reduce the turn-off power loss as caused by tail currents when as IGBT device shutdown, and SiC bis-
Pole pipe can substitute general-purpose diode, the available good inhibition of the loss of Reverse recovery.The utility model circuit can have
The inhibition common mode leakage current of effect, while improving the efficiency of grid-connected system.
Detailed description of the invention
Fig. 1 is a kind of single-phase active clamper non-isolated grid-connected inverter structure chart.
Fig. 2 a~2d is circuit modal graph in network voltage positive-negative half-cycle (wherein with respect to Fig. 1 component lacked and connecting line
For off state).
Fig. 3 is 6 switching tube (S in embodiment1-S6) drive signal waveform.
Specific embodiment
The specific implementation of the utility model is described further below in conjunction with attached drawing and example, but the guarantor of the utility model
It is without being limited thereto to protect range.If being those skilled in the art it is noted that having the process or symbol of not special detailed description below
Member can refer to the prior art understand or realize.
A kind of Basic Topological such as Fig. 1 institute of single-phase active clamper non-isolated grid-connected inverter of the utility model
Show, for easy analysis, the device in circuit structure is accordingly to be regarded as ideal component.
Such as Fig. 1, a kind of single-phase active clamper non-isolated grid-connected inverter specifically includes a switching tube S1, second open
Close pipe S2, third switching tube S3, the 4th switching tube S4, the 5th switching tube S5, the 6th switching tube S6, the 7th switching tube S7, the 8th open
Close pipe S8, first diode VD1, the second diode VD2, third diode VD3, the 4th diode VD4, the first inductance L1, second
Inductance L2, first capacitor Cdc1, the second capacitor Cdc2.The specific connection type of the utility model circuit are as follows: the anode of DC bus
With first capacitor Cdc1One end, first switch tube S1Drain electrode and third switching tube S3Drain electrode connection.First capacitor Cdc1It is another
One end and the second capacitor Cdc2One end, the 7th switching tube S7Drain electrode and the 8th switching tube S8Drain electrode connection.DC bus
Cathode and the second capacitor Cdc2The other end, second switch S2Source electrode and the 4th switching tube S4Source electrode connection.First switch
Pipe S1Source electrode and first diode VD1Cathode, the 5th switching tube S5Drain electrode and the first inductance L1One end connection.First
Inductance L1The other end be connected with one end of power grid.First diode VD1Anode and the 7th switching tube S7Source electrode and the three or two
Pole pipe VD3Cathode connection.Third diode VD3Anode and the 6th switching tube S6Source electrode and second switch S2Drain electrode
Connection.Third switching tube S3Source electrode and the second diode VD2Cathode, the 6th switching tube S6Drain electrode and the second inductance L2's
One end connection.Second diode VD2Anode and the 8th switching tube S8Source electrode and the 4th diode VD4Cathode connection.4th
Diode VD4Anode and the 5th switching tube S5Source electrode and the 4th switching tube S4Drain electrode connection.Second inductance L2The other end
It is connect with the power grid other end.PV Cell indicates photovoltaic cell in figure.
Fig. 2 a~2d is circuit modal graph in network voltage positive-negative half-cycle, in order to enable circuit expression is more clear, wherein
Opposite Fig. 1 reduction component and connecting line be off state.
(1) in the positive half cycle of network voltage, circuit is as shown in Figure 2 a in the modal graph in this stage, first switch tube S1With
Two switching tube S2It simultaneously turns on, the 6th switching tube S6Conducting, the 7th switching tube S7Conducting, grid-connected current flow through first switch tube S1、
First inductance L1, power grid, the second inductance L2, the 6th switching tube S6, second switch S2It powers to power grid, bridge arm output voltage is
UAB=+UDC.It is U to the voltage of DC bus negative terminal N that bridge arm, which exports A point,AN=UDC, bridge arm output B point is to DC bus negative terminal N
Voltage be UBN=0, so
(2) freewheeling period, circuit is as shown in Figure 2 b in the modal graph in this stage, first switch tube S1Conducting and second switch
Pipe S2It simultaneously turns off, the 6th switching tube S6, first diode VD1With third diode VD3Conducting, the 7th switching tube S7Conducting.Electricity
Stream flows through the first inductance L1, power grid, the second inductance L2, the 6th switching tube S6, first diode VD1, third diode VD3Afterflow,
Bridge arm output voltage is UAB=0.Due to the 7th switching tube S7Conducting, it is U to the voltage of DC bus negative terminal N that bridge arm, which exports A point,AN
=0.5UDC, it is U to the voltage of DC bus negative terminal N that bridge arm, which exports B point,BN=0.5UDC, so
(3) in the negative half period of network voltage, circuit is as shown in Figure 2 c in the modal graph in this stage, third switching tube S3 and
Four switching tube S4It simultaneously turns on, the 5th switching tube S5Conducting, the 8th switching tube S8Conducting, grid-connected current flow through third switching tube S3,
Second inductance L2, power grid, the first inductance L1, the 5th switching tube S5, the 4th switching tube S4It powers to power grid, bridge arm output voltage is
UAB=-UDC.It is U to the voltage of DC bus negative terminal N that bridge arm, which exports A point,AN=0, bridge arm exports B point to DC bus negative terminal N's
Voltage is UBN=UDC, so
(4) freewheeling period, circuit is as shown in Figure 2 d in the modal graph in this stage, third switching tube S3 and the 4th switching tube S4
It simultaneously turns off, the 5th switching tube S5, the second diode VD2With the 4th diode VD4Conducting, the 8th switching tube S8Conducting.Electric current stream
Through the second inductance L2, power grid, the first inductance L1, the 5th switching tube S5, the second diode VD2, the 4th diode VD4Afterflow, bridge arm
Output voltage is UAB=0.Due to the 7th switching tube S7With the 8th switching tube S8Conducting, bridge arm export A point to DC bus negative terminal N
Voltage be UAN=0.5UDC, it is U to the voltage of DC bus negative terminal N that bridge arm, which exports B point,BN=0.5UDC, so
As the above analysis, common-mode voltage Ucm=0.5UDCIt keeps constant.Therefore, common mode leakage current can obtain very well
Inhibition.Simultaneously because freewheeling period electric current is not passed through body diode, therefore MOSFET element can be used, reduce due to
The turn-off power loss as caused by tail currents when IGBT device turns off, and SiC diode can substitute general-purpose diode, it is reversed extensive
The available good inhibition of multiple loss.Therefore the utility model circuit can effectively inhibit common mode leakage current, mention simultaneously
The efficiency of high grid-connected system.
Claims (3)
1. a kind of single-phase non-isolated active clamp MOSFET inverter, it is characterised in that including a switching tube (S1), second switch
(S2), third switching tube (S3), the 4th switching tube (S4), the 5th switching tube (S5), the 6th switching tube (S6), the 7th switching tube
(S7), the 8th switching tube (S8), first diode (VD1), the second diode (VD2), third diode (VD3), the 4th diode
(VD4), the first inductance (L1), the second inductance (L2), first capacitor (Cdc1) and the second capacitor (Cdc2)；DC bus anode with
First capacitor (Cdc1) one end, first switch tube (S1) drain electrode and third switching tube (S3) drain electrode connection；First capacitor(Cdc1) the other end and the second capacitor (Cdc2) one end, the 7th switching tube (S7) drain electrode and the 8th switching tube (S8) drain electrode
Connection；The cathode of DC bus and the second capacitor (Cdc2) the other end, second switch (S2) source electrode and the 4th switching tube
(S4) source electrode connection；First switch tube (S1) source electrode and first diode (VD1) cathode, the 5th switching tube (S5) leakage
Pole and the first inductance (L1) one end connection；First inductance (L1) the other end be connected with one end of power grid；First diode
(VD1) anode and the 7th switching tube (S7) source electrode and third diode (VD3) cathode connection；Third diode (VD3)
Anode and the 6th switching tube (S6) source electrode and second switch (S2) drain electrode connection；Third switching tube (S3) source electrode and
Two diode (VD2) cathode, the 6th switching tube (S6) drain electrode and the second inductance (L2) one end connection；Second diode
(VD2) anode and the 8th switching tube (S8) source electrode and the 4th diode (VD4) cathode connection；4th diode (VD4)
Anode and the 5th switching tube (S5) source electrode and the 4th switching tube (S4) drain electrode connection；Second inductance (L2) the other end and electricity
The connection of the net other end.
2. the single-phase non-isolated active clamp MOSFET inverter of one kind according to claim 1, it is characterised in that: described to open
It closes pipe and is all made of the enhanced MOSFET of N-channel.
3. the single-phase non-isolated active clamp MOSFET inverter of one kind according to claim 1, it is characterised in that: the 7th opens
It closes eight switching tube of Guan Yu and plays clamping action, first capacitor (Cdc1) and the second capacitor (Cdc2) capacitance is equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821626056.8U CN209516966U (en) | 2018-09-30 | 2018-09-30 | A kind of single-phase non-isolated active clamp MOSFET inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821626056.8U CN209516966U (en) | 2018-09-30 | 2018-09-30 | A kind of single-phase non-isolated active clamp MOSFET inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209516966U true CN209516966U (en) | 2019-10-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821626056.8U Expired - Fee Related CN209516966U (en) | 2018-09-30 | 2018-09-30 | A kind of single-phase non-isolated active clamp MOSFET inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209516966U (en) |
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2018
- 2018-09-30 CN CN201821626056.8U patent/CN209516966U/en not_active Expired - Fee Related
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Granted publication date: 20191018 |