CN109660119A - A kind of resonant switched capacitor converter - Google Patents
A kind of resonant switched capacitor converter Download PDFInfo
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- CN109660119A CN109660119A CN201811558596.1A CN201811558596A CN109660119A CN 109660119 A CN109660119 A CN 109660119A CN 201811558596 A CN201811558596 A CN 201811558596A CN 109660119 A CN109660119 A CN 109660119A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- 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
Abstract
The present invention discloses a kind of resonant switched capacitor converter.Resonant switched capacitor converter provided by the invention includes: first switch, second switch, first diode, the second diode, third diode, the 4th diode, the first resonant capacitance, the second resonant capacitance, resonant inductance and storage capacitor.The switching frequency of resonant switched capacitor converter provided by the invention is greater than resonance frequency and less than 2 times resonance frequencies, realize simultaneous " charge balance " mode of two groups of resonance currents, it can not only realize that switching tube ZVS is opened to turn off with diode ZCS, and can achieve the purpose that wide scope linear voltage regulation.
Description
Technical field
The present invention relates to DC-DC converter fields, more particularly to a kind of resonant switched capacitor converter.
Background technique
Resonant switched capacitor can reduce the charging current spike of traditional switch capacitor, realize the soft of switching tube and diode
Switch, therefore electromagnetic interference and switching loss can be reduced.The switching frequency of traditional resonant switched capacitor converter is located at two
When/mono- resonance frequency is between resonance frequency, zero current turning-on and the shutdown of switching tube and diode, and energy can be realized
Realize soft charge and discharge, but the efficient linear that can not achieve output voltage is adjusted, greatly limitation resonant switched capacitor transformation
The application range of device.
Summary of the invention
The object of the present invention is to provide a kind of resonant switched capacitor converter, can not only realize switching tube ZVS open and
Diode ZCS shutdown, and can achieve the purpose that wide scope linear voltage regulation.
To achieve the above object, the present invention provides following schemes:
A kind of resonant switched capacitor converter, the converter include: first switch, second switch, first diode,
Two diodes, third diode, the 4th diode, the first resonant capacitance, the second resonant capacitance, resonant inductance and storage capacitor,
Wherein,
Input voltage anode is connect with the anode of the input terminal of the first switch and the first diode respectively, described
The output end of first switch is connect with the input terminal of the second switch, the output end and input voltage cathode of the second switch
Connection, the cathode of the first diode first end with the anode of second diode and first resonant capacitance respectively
Connection, the second end of first resonant capacitance are connect with the first end of the resonant inductance, the second end of the resonant inductance
Connect with the output end of the first switch, the cathode of second diode respectively with the anode of the third diode and institute
The first end connection of storage capacitor is stated, the second end of the storage capacitor is connect with the input voltage cathode, and the described 3rd 2
The cathode of pole pipe is connect with the first end of the anode of the 4th diode and the second resonant capacitance respectively, the second resonance electricity
The second end of appearance is connect with the second end of first resonant capacitance, and the cathode of the 4th diode is output voltage anode
End, the second end of the storage capacitor are output voltage negative pole end；
Wherein, the switching frequency of the first switch is greater than resonance frequency and less than 2 times resonance frequencies, the second switch
Switching frequency be greater than the resonance frequency and less than the 2 times resonance frequencies.
Optionally, the converter further includes output filter capacitor, the first end of the output filter capacitor and described the
The cathode of four diodes connects, and the second end of the output filter capacitor is connect with the second end of the storage capacitor.
Optionally, the first switch and the second switch are metal oxide semiconductor field effect tube.
Optionally, the first switch and the second switch are insulated gate bipolar transistor.
Optionally, the input voltage cathode is connect with ground terminal, and the output voltage negative pole end and the ground terminal connect
It connects.
Optionally, the capacitance of first resonant capacitance and second resonant capacitance is equal.
Optionally, the capacitance of first resonant capacitance of the capacitance of the storage capacitor greater than 10 times, and it is described
The capacitance of second resonant capacitance of the capacitance of storage capacitor greater than 10 times.
Optionally, the converter further includes input filter capacitor, the first end of the input filter capacitor with it is described defeated
Enter positive polarity connection, the second end of the input filter capacitor is connect with the input voltage cathode.
The specific embodiment provided according to the present invention, the invention discloses following technical effects:
Resonant switched capacitor converter provided by the invention includes: first switch, second switch, first diode, second
Diode, third diode, the 4th diode, the first resonant capacitance, the second resonant capacitance, resonant inductance and storage capacitor.It is defeated
Enter positive polarity to connect with the anode of the input terminal of first switch and first diode respectively, the output end of first switch and second
The input terminal of switch connects, and the output end of second switch is connect with input voltage cathode, and the cathode of first diode is respectively with the
The connection of the first end of the anode of two diodes and the first resonant capacitance, the first of the second end of the first resonant capacitance and resonant inductance
The second end of end connection, the second end of resonant inductance and first switch connects, the cathode of the second diode respectively with the three or two pole
The anode of pipe is connected with the first end of storage capacitor, and the second end of storage capacitor is connect with input voltage cathode, third diode
Cathode connect respectively with the first end of the anode of the 4th diode and the second resonant capacitance, the second end of the second resonant capacitance with
The second end of first resonant capacitance connects, and the cathode of the 4th diode is output voltage positive terminal, and the second end of storage capacitor is
Output voltage negative pole end.The switching frequency of resonant switched capacitor converter provided by the invention is greater than resonance frequency and less than 2 times
Resonance frequency realizes simultaneous " charge balance " mode of two groups of resonance currents, can not only realize that switching tube ZVS is open-minded
It is turned off with diode ZCS, and can achieve the purpose that wide scope linear voltage regulation.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of circuit diagram of resonant switched capacitor converter provided in an embodiment of the present invention；
Fig. 2 is the working waveform figure of resonant switched capacitor converter provided in an embodiment of the present invention；
Fig. 3 is equivalent circuit diagram of the resonant switched capacitor converter provided in an embodiment of the present invention at [t0~t1] moment；
Fig. 4 is equivalent circuit diagram of the resonant switched capacitor converter provided in an embodiment of the present invention at [t1~t2] moment；
Fig. 5 is equivalent circuit diagram of the resonant switched capacitor converter provided in an embodiment of the present invention at [t2~t3 '] moment；
Fig. 6 is equivalent circuit diagram of the resonant switched capacitor converter provided in an embodiment of the present invention at [t3 '~t3] moment；
Fig. 7 is equivalent circuit diagram of the resonant switched capacitor converter provided in an embodiment of the present invention at [t3~t4] moment；
Fig. 8 is the theoretical gain curve of resonant switched capacitor converter provided in an embodiment of the present invention；
The resonance electricity that Fig. 9 is the switching frequency of resonant switched capacitor converter provided in an embodiment of the present invention when being 140KHZ
The experimental waveform figure of stream and resonance potential and output voltage.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of resonant switched capacitor converter, can not only realize switching tube ZVS open and
Diode ZCS shutdown, and can achieve the purpose that wide scope linear voltage regulation.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 is a kind of circuit diagram of resonant switched capacitor converter provided in an embodiment of the present invention.As shown in Figure 1, a kind of
Resonant switched capacitor converter, the converter include: first switch S1, second switch S2, first diode D1, the two or two pole
Pipe D2, third diode D3, the 4th diode D4, the first resonant capacitance Cr1, the second resonant capacitance Cr2, resonant inductance Lr and storage
It can capacitor C1.The capacitance of the first resonant capacitance Cr1 and the second resonant capacitance Cr2 are equal.
Input voltage anode 1 connects with the anode of the input terminal of the first switch S1 and the first diode D1 respectively
It connects, the output end of the first switch S1 is connect with the input terminal of the second switch S2, the output end of the second switch S2
Connect with input voltage cathode 1 ', the cathode of the first diode D1 respectively with the anode of the second diode D2 and described
The first end of first resonant capacitance Cr1 connects, the second end of the first resonant capacitance Cr1 and the first of the resonant inductance Lr
End connection, the second end of the resonant inductance Lr are connect with the output end of the first switch S1, the second diode D2's
Cathode is connect with the first end of the anode of the third diode D3 and the storage capacitor C1 respectively, the storage capacitor C1's
Second end is connect with the input voltage cathode 1 ', and the cathode of the third diode D3 is respectively with the 4th diode D4's
The connection of the first end of anode and the second resonant capacitance Cr2, the second end of the second resonant capacitance Cr2 and first resonance electricity
Holding the second end connection of Cr1, the cathode of the 4th diode D4 is output voltage positive terminal 2, the of the storage capacitor C1
Two ends are output voltage negative pole end 2 '.The input voltage cathode 1 ' is connect with ground terminal 3, the output voltage negative pole end 2 ' with
The ground terminal 3 connects.Wherein, the switching frequency of the first switch S1 is greater than resonance frequency and less than 2 times resonance frequencies, institute
The switching frequency for stating second switch S2 is greater than the resonance frequency and less than the 2 times resonance frequencies.
Preferably, the converter further includes output filter capacitor C2, the first end of the output filter capacitor C2 and institute
State the cathode connection of the 4th diode D4, the second end company of the second end of the output filter capacitor C2 and the storage capacitor C1
It connects.Further, the converter further includes input filter capacitor, the first end of the input filter capacitor and input electricity
The connection of positive pressure pole, the second end of the input filter capacitor are connect with the input voltage cathode.
In the present embodiment, the capacitor of the first resonant capacitance Cr1 of the capacitance greater than 10 times of the storage capacitor C1
Value, and the capacitance of the second resonant capacitance Cr2 of the capacitance of the storage capacitor C1 greater than 10 times.The first switch
S1 and the second switch S2 are chosen as metal oxide semiconductor field effect tube, it is preferable that the first switch S1 and described
Second switch S2 is insulated gate bipolar transistor.
In the present embodiment, the switching frequency of the first switch S1 and the second switch S2 are all larger than resonance frequency and small
In 2 times of resonance frequencies, i.e. fr< fs< 2fr, wherein frFor resonance frequency, fsFor the switching frequency of converter, first can be realized
Switching tube S1 and second switch S2 (ZVS) in a manner of no-voltage is opened or is turned off, and diode is with (zero current) side ZCS
Formula is opened or is turned off.
It is be overlapped to prevent first switch tube S1 from occurring when opening with second switch S2, after second switch S2 shutdown,
Before first switch tube S1 is opened, there are the dead times of setting.When converter works, first switch tube S1 and second switch
The driving signal of S2 is that duty ratio is fixed as the adjustable pulse signal of 0.5, frequency.
Fig. 2 is the working waveform figure of resonant switched capacitor converter provided in an embodiment of the present invention.As shown in Fig. 2, this reality
Applying the resonant switched capacitor converter that example provides, the specific working principle is as follows:
At [t0~t1] moment, the equivalent circuit of resonant switched capacitor converter is as shown in Figure 3.Electricity as shown in connection with fig. 2
For road waveform diagram it is found that the t0 moment passes through the electric current of second switch S2 as negative direction, second switch S2 is open-minded in a manner of ZVS；Second
Diode D2 and the 4th diode D4 are in the conductive state.Under this mode, there are two resonance accesses in circuit, resonance current,
Resonance potential and the expression formula of output voltage are as follows:
Vcr1(t)=Vc-(VC-Vcr1_min)cos2πfr(t-t1) (2)
Vo=VC+[Vcr2(t)-Vcr1(t)] (3)
Wherein, frIndicate resonance frequency,Lr indicates the inductance value of resonant inductance, iLrIndicate resonance electricity
Stream, t indicate time, VCIndicate the voltage of storage capacitor, Vcr1Indicate the voltage on the first resonant capacitance Cr1, Vcr2Indicate second
Voltage on resonant capacitance Cr2, Vcr1_minIndicate the voltage minimum on the first resonant capacitance Cr1, Vcr2_minIndicate the second resonance
Voltage minimum on capacitor Cr2, CrIndicate the capacitance of the first resonant capacitance and the second resonant capacitance, Vo indicates output electricity
Pressure.
At [t1~t2] moment, the equivalent circuit of resonant switched capacitor converter is as shown in Figure 4.Electricity as shown in connection with fig. 2
Road waveform diagram, the electric current that the t1 moment passes through second switch S2 are positive direction, and first diode D1 and third diode D3 is in and leads
Logical state.Under this mode, there are two resonance accesses in circuit, the expression formula of interlock circuit parameter is as follows:
Vcr1(t)=Vin-(Vin-Vcr1_min)cos2πfr(t-t1) (5)
Vcr2(t)-Vcr1(t)=Vc-Vin (6)
Wherein, VinIndicate input voltage.
At [t2~t4] moment, the equivalent circuit of resonant switched capacitor converter is as shown in Figure 5-Figure 7.The section is by three
Be grouped as: t2~t3 ', t3 '~t3 and t3~t4, specific work process are as follows:
At [t2~t3 '] moment, second switch S2 shutdown, parasitic capacitance C of the loop current to second switch S2ds2It carries out
Charging, the parasitic capacitance C of first switch S1ds1It carries out being discharged to t3 ', first diode D1 is on third diode D3
State.Under this state, there are two resonance accesses in circuit.
[t3 '~t3]: after the t3 ' moment, parasitic capacitance Cds1Electric discharge end voltage becomes 0, the reverse parallel connection of first switch S1
Diode begins to turn on electric current, and at the t3 moment, first switch S1 is open-minded in a manner of ZVS, first diode D1 and third diode D3
It is in the conductive state.Under this state, there are two resonance accesses in circuit.
[t3~t4]: at the t3 moment, first switch S1 is open-minded in a manner of ZVS, and first switch S1 begins to turn on electric current, and the one or two
Pole pipe D1 and third diode D3 are in the conductive state.Under this state, there are two resonance accesses in circuit.
In entire section [t2~t4], circuit parameter expression formula is as follows:
Vcr1(t)=Vcr1_max)cos2πfr(t-t4) (8)
Wherein, Vcr1_maxIndicate the voltage max on the first resonant capacitance Cr1.
Ideally, the voltage gain curve of resonant switched capacitor converter shown in FIG. 1 is as shown in Figure 8.Wherein, k
=CrRLfs,
(1 < F < 2), wherein RLIndicate the equivalent resistance of load, fsIndicate the working frequency of first switch and the second switch, Cr is indicated
The capacitance of first resonant capacitance and the second resonant capacitance.As it can be seen that resonant switched capacitor converter provided in an embodiment of the present invention
In can continuous voltage regulating range, compared with traditional Dickson switched-capacitor circuit, voltage gain can be adjusted in a big way.
Fig. 9 is the experimental waveform figure of resonant switched capacitor converter provided in an embodiment of the present invention.Wherein, circuit topology is joined
Number are as follows: output power P the < 150W, input voltage V of converterin=48V, output voltage Vo< 144V, switching frequency range are as follows:
125kHz < fs< 250kHZ, input filter capacitor Cin=100uF, output filter capacitor C2=100uF, storage capacitor C1=
40uF, resonant capacitance Cr1=Cr2=100nF, resonant inductance Lr=8uH, resonance frequency fr=125kHz.
Fig. 9 is resonance current, resonance potential and output voltage of the circuit shown in Fig. 1 when switching frequency is 140KHZ
Experimental waveform figure.Partially partially visible with (b) by (a) of figure Fig. 9, first switch S1 and second switch S2 realize that ZVS mode is opened
It is logical；Partially visible according to (c) of Fig. 9, the voltage curve of resonant capacitance is identical as the theoretical curve in Fig. 2.According to (d) of Fig. 9
Partially visible, storage capacitor C1 both end voltage is adjustable to 89V or so, and output voltage is adjusted to 130V or so, this and formula
(3) and the calculated value of formula (6) exactly matches (Vin+Vout=2Vc)。
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (8)
1. a kind of resonant switched capacitor converter, which is characterized in that the converter includes: first switch, second switch, first
Diode, the second diode, third diode, the 4th diode, the first resonant capacitance, the second resonant capacitance, resonant inductance and
Storage capacitor, wherein
Input voltage anode is connect with the anode of the input terminal of the first switch and the first diode respectively, and described first
The output end of switch is connect with the input terminal of the second switch, and the output end and input voltage cathode of the second switch connect
It connects, the cathode of the first diode connects with the first end of the anode of second diode and first resonant capacitance respectively
Connect, the second end of first resonant capacitance is connect with the first end of the resonant inductance, the second end of the resonant inductance with
The output end of the first switch connects, the cathode of second diode respectively with the anode of the third diode and described
The first end of storage capacitor connects, and the second end of the storage capacitor is connect with the input voltage cathode, the three or two pole
The cathode of pipe is connect with the first end of the anode of the 4th diode and the second resonant capacitance respectively, second resonant capacitance
Second end connect with the second end of first resonant capacitance, the cathode of the 4th diode is output voltage positive terminal,
The second end of the storage capacitor is output voltage negative pole end；
Wherein, the switching frequency of the first switch is greater than resonance frequency and less than 2 times resonance frequencies, the second switch are opened
It closes frequency and is greater than the resonance frequency and less than the 2 times resonance frequencies.
2. capacitive transducer according to claim 1, which is characterized in that the converter further includes output filter capacitor,
The first end of the output filter capacitor is connect with the cathode of the 4th diode, the second end of the output filter capacitor with
The second end of the storage capacitor connects.
3. capacitive transducer according to claim 1, which is characterized in that the first switch and the second switch are
Metal oxide semiconductor field effect tube.
4. capacitive transducer according to claim 1, which is characterized in that the first switch and the second switch are exhausted
Edge grid bipolar transistor.
5. capacitive transducer according to claim 1, which is characterized in that the input voltage cathode is connect with ground terminal,
The output voltage negative pole end is connect with the ground terminal.
6. capacitive transducer according to claim 1, which is characterized in that first resonant capacitance and second resonance
The capacitance of capacitor is equal.
7. capacitive transducer according to claim 6, which is characterized in that the capacitance of the storage capacitor is greater than 10 times
The capacitance of first resonant capacitance, and the electricity of second resonant capacitance of the capacitance of the storage capacitor greater than 10 times
Capacitance.
8. capacitive transducer according to claim 1, which is characterized in that the converter further includes input filter capacitor,
The first end of the input filter capacitor is connect with the input voltage anode, the second end of the input filter capacitor with it is described
The connection of input voltage cathode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811558596.1A CN109660119A (en) | 2018-12-19 | 2018-12-19 | A kind of resonant switched capacitor converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811558596.1A CN109660119A (en) | 2018-12-19 | 2018-12-19 | A kind of resonant switched capacitor converter |
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| CN109660119A true CN109660119A (en) | 2019-04-19 |
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| CN201811558596.1A Pending CN109660119A (en) | 2018-12-19 | 2018-12-19 | A kind of resonant switched capacitor converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4246790A4 (en) * | 2021-01-28 | 2024-01-03 | Huawei Digital Power Tech Co Ltd | Conversion circuit, pre-charging control method for conversion circuit, and photovoltaic system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203352440U (en) * | 2013-05-29 | 2013-12-18 | 盐城工学院 | Tri-state DC/DC converter |
| CN204696926U (en) * | 2015-06-19 | 2015-10-07 | 正德职业技术学院 | A kind of adjustable compression set LLC resonant converter frequently |
-
2018
- 2018-12-19 CN CN201811558596.1A patent/CN109660119A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203352440U (en) * | 2013-05-29 | 2013-12-18 | 盐城工学院 | Tri-state DC/DC converter |
| CN204696926U (en) * | 2015-06-19 | 2015-10-07 | 正德职业技术学院 | A kind of adjustable compression set LLC resonant converter frequently |
Non-Patent Citations (1)
| Title |
|---|
| SHOUXIANG LI，ET AL: "A Family of Resonant Two-Switch Boosting Switched-Capacitor Converter With ZVS Operation and a Wide Line Regulation Range", 《IEEE TRANSACTIONS ON POWER ELECTRONICS》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP4246790A4 (en) * | 2021-01-28 | 2024-01-03 | Huawei Digital Power Tech Co Ltd | Conversion circuit, pre-charging control method for conversion circuit, and photovoltaic system |
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Application publication date: 20190419 |