CN107947575A - Modularization can the double Buck tandem cell charger main circuit topologies of connection in series-parallel - Google Patents

Modularization can the double Buck tandem cell charger main circuit topologies of connection in series-parallel Download PDF

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Publication number
CN107947575A
CN107947575A CN201711414747.1A CN201711414747A CN107947575A CN 107947575 A CN107947575 A CN 107947575A CN 201711414747 A CN201711414747 A CN 201711414747A CN 107947575 A CN107947575 A CN 107947575A
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China
Prior art keywords
msub
mrow
buck
mtr
mtd
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CN201711414747.1A
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Inventor
严干贵
李洪波
段双明
刘彦宇
朱微
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Northeast Electric Power University
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Northeast Dianli University
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/022Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters characterised by the type of converter
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04Regulation of charging current or voltage
    • H02J7/06Regulation of charging current or voltage using discharge tubes or semiconductor devices
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04Regulation of charging current or voltage
    • H02J7/06Regulation of charging current or voltage using discharge tubes or semiconductor devices
    • H02J2007/10Regulation of charging current or voltage using discharge tubes or semiconductor devices using semiconductor devices only
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/0067Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007Plural converter units in cascade

Abstract

The invention discloses a kind of modularization can the double Buck tandem cell charger main circuit topologies of connection in series-parallel, which is formed by the cascade of two-stage Buck chopper circuits;By full-bridge rectification module D in circuit1With filter capacitor C1AC/DC industrial frequency rectifying modules are formed, its input is 220V alternating currents, and output voltage is 310V direct currents;First order Buck buck choppers converter is by switching tube S1, diode D2, energy storage inductor L1And filter capacitor C2Form, its input is 310V DC voltages, is exported as the DC voltage through primary decompression;Second level Buck buck choppers converter is by switching tube S2, diode D3, energy storage inductor L2And filter capacitor C3Form.The present invention is suitable for different capabilities scale battery pack, can connection in series-parallel use so that the charger output voltage precision higher, output current driving force bigger, and lower to integral product assembling device performance requirement.

Description

Modularization can the double Buck tandem cell charger main circuit topologies of connection in series-parallel
Technical field
The present invention relates to battery energy storage technical field, and in particular to a kind of modularization can the double Buck tandem cells of connection in series-parallel fill Motor main circuit topology.
Background technology
With in October, 2017 China's development with reforming finger of committee's issue on promoting energy storage technology and industry development Opinion issue is led, the application of China's battery energy storage technology will enter a brand-new development epoch.Energy-storage battery extensively should With making its requirement to charging equipment constantly be lifted, being applicable to the charger of different capabilities scale energy-storage battery group will welcome newly Challenge.Since the charge requirement of different model, different scale cell group is different, so also having for the performance requirement of charger Larger difference.
Energy-storage battery improper use, will reduce its service life significantly.The many because being known as of its service life length are influenced, its In a key factor be discharge and recharge improper use.Whether the charging process of battery is rationally maximum to the influence of battery in itself , therefore rational charging modes are used, the service life of battery can be greatly prolonged.
The charge efficiency of current relatively conventional conventional linear mains charger and silicon-controlled charger is low, output ripple Greatly, volume is heavy, it is difficult to meet that different scales type energy-storage battery is high-power, high efficiency charge requirement.Existing full-bridge high-frequency is inverse Charging circuit after change through transformer transformation into multichannel reduced output voltage, such circuit are passed suitable for high-tension high-power energy Pass, band isolation between output input, but its volume is larger, is not suitable for low-voltage small-capacity cells or miniature instrument for electric field Close.And use charging of the topological structure for DC/DC buck choppers by the isolation buck conversion filtering output of Flyback converters Circuit, has used the isolation of front stage, and the ripple of output voltage electric current is small, output voltage grade is fixed, transimission power is relatively low, fits For to the relatively low low current low voltage power supply situation of power requirement or more precision instrument component to supply electricity consumption occasion.Both High or low power occasion, which is unable to reach, to be taken into account, even if there is some products to reach the effect taken into account, but is existed unavoidably and is wasted one's talent on a petty job or small Just circumstances by force.
The content of the invention
To solve the above problems, the present invention provides modularization can the double Buck tandem cell charger main circuits of connection in series-parallel open up Flutter, output voltage precision higher, output current driving force bigger, its can the functions expanding that uses of connection in series-parallel its promote should The property used.
To achieve the above object, the technical solution taken of the present invention is:
Modularization can the double Buck tandem cell charger main circuit topologies of connection in series-parallel, which is cut by two-stage Buck Wave circuit cascade forms;By full-bridge rectification module D in circuit1With filter capacitor C1AC/DC industrial frequency rectifying modules are formed, it is inputted For 220V alternating currents, output voltage is 310V direct currents;First order Buck buck choppers converter is by switching tube S1, diode D2, storage Can inductance L1And filter capacitor C2Form, its input is 310V DC voltages, is exported as the DC voltage through primary decompression;The Two level Buck buck choppers converter is by switching tube S2, diode D3, energy storage inductor L2And filter capacitor C3Form.
Wherein, the primary Buck circuit output voltages u of the main circuit topology2It is shown below:
In formula, α1For primary switch pipe S1Raster data model PWM duty cycle, t1onAnd t1offRespectively switching tube S1Open and close The disconnected time;
Secondary Buck circuit output voltages u3It is shown below:
In formula, α2For secondary switch pipe S2Raster data model PWM duty cycle, t2onAnd t2offRespectively switching tube S2Open and close The disconnected time;
Output voltage u can be obtained more than3With u0Relation be shown below:
Can must be by adjusting α by formula (3)1And α2Size, that is, adjustable output voltage size.
Wherein, two-stage converter output voltage current relationship used in parallel is shown below:
The two-stage converter output voltage current relationship being used in series is shown below:
Present invention can be suitably applied to different capabilities scale battery pack, can connection in series-parallel use so that the charger output voltage essence Accuracy higher, output current driving force bigger, and it is lower to integral product assembling device performance requirement, make equipment manufacturing cost opposite Decline.
Brief description of the drawings
Fig. 1 can the double Buck tandem cell charger main circuit topology figures of connection in series-parallel for modularization of the embodiment of the present invention
Fig. 2 is the equivalent circuit used in the embodiment of the present invention
Fig. 3 circuit topologies of the embodiment of the present invention are used in series equivalent circuit
Fig. 4 is single-stage Buck chopper circuit output voltage waveforms in the embodiment of the present invention
Fig. 5 is the circuit output voltage waveform of the embodiment of the present invention.
Embodiment
In order to which objects and advantages of the present invention are more clearly understood, the present invention is carried out with reference to embodiments further Describe in detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to limit this hair It is bright.
An embodiment of the present invention provides a kind of modularization can the double Buck tandem cell charger main circuit topologies of connection in series-parallel, by The cascade of two-stage Buck chopper circuits forms;The inventive principle structure main circuit diagram is as shown in Figure 1.By full-bridge rectification module in circuit D1With filter capacitor C1AC/DC industrial frequency rectifying modules are formed, its input is 220V alternating currents, and output voltage is 310V direct currents;First Level Buck buck choppers converter is by switching tube S1, diode D2, energy storage inductor L1And filter capacitor C2Form, its input is 310V DC voltages, export as the DC voltage through primary decompression;Second level Buck buck choppers converter is by switching tube S2, two Pole pipe D3, energy storage inductor L2And filter capacitor C3Form.
Primary Buck circuit output voltages u2It is shown below:
In formula, α1For primary switch pipe S1Raster data model PWM duty cycle, t1onAnd t1offRespectively switching tube S1Open and close The disconnected time.
Secondary Buck circuit output voltages u3It is shown below:
In formula, α2For secondary switch pipe S2Raster data model PWM duty cycle, t2onAnd t2offRespectively switching tube S2Open and close The disconnected time.
Output voltage u can be obtained more than3With u0Relation be shown below:
Can must be by adjusting α by formula (3)1And α2Size, that is, adjustable output voltage size.
The modularization that the invention proposes can the double another big features of Buck tandem cell charger main circuit topologies of connection in series-parallel just It is that the charger can be used with connection in series-parallel.The double Buck cascaded charge machines of modularization equivalent circuit used in parallel is as shown in Figure 2.Module It is used in parallel constant for loading received voltage swing to change double Buck cascaded circuit topologies, the purpose is to be increase output electricity Size is flowed, so as to strengthen the driving force of circuit, converter is realized and powers to the high current of load.Twin-stage used in parallel becomes Parallel operation output voltage current relationship is shown below:
It is as shown in Figure 3 that the double Buck cascaded charge machines of modularization are used in series equivalent circuit.
The double Buck cascaded circuit topologies of modularization are used in series has no too big intervention for output current size, the purpose is to To strengthen output voltage precision and output voltage stability, make circuit that there is the environmental suitability of higher.The twin-stage being used in series Converter output voltage current relationship is shown below:
When requiring input voltage to exchange (310V direct currents) for 220V, output voltage is 2.35V (single battery even charging voltage) During direct current, single-stage Buck chopper circuit output voltage waveforms are as shown in Figure 4.
Upper figure can show that output voltage ripple Δ u ≈ 1.7V, output voltage ripple rate size is shown below:
Present invention design circuit output voltage waveform is as shown in figure 5, output voltage ripple Δ u ≈ 0.018V, output voltage Ripple rate r=0.0076
Design circuit output precision higher of the invention is obtained by above voltage ripple and the big I of output voltage ripple rate, is stablized Property is more preferable.Output voltage is by switching tube S in the design1And S2Driving duty cycle alpha1And α2Together decide on, duty cycle alpha1And α2With Single-stage drives duty cycle alpha0Relation be shown below:
α1×α20(7)
Due to 0 < α1< 1 and 0 < α2< 1, then α0< α1And α0< α2.As input voltage uiWith output voltage uoDifference compared with When big, if realizing buck functionality using only monopole Buck copped waves topology, its output voltage uoStability and precision will drop significantly It is low, and also have higher requirement to the stability of input terminal voltage.And for twin-stage topology, its output voltage is by two-stage electricity Buckling is changed, and precision and the voltage stability enhancing of its output voltage, make input terminal voltage reduce the interference of output terminal, its is comprehensive Performance indicator is closed to greatly improve.
Double Buck cascaded topologies circuits of this specific implementation design are low to power supply stability requirement, charger output electricity It is small to emboss ripple rate, output accuracy is high, small to battery impact, adds the service life of energy-storage battery indirectly;Two-stage switch drives PWM duty cycle enlarged relative, to design device performance requirements bottom, is more easy to realize, manufactures cost relative reduction on hardware;The topology Can connection in series-parallel use, export occasion suitable for high current or high-accuracy voltage.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, without departing from the principle of the present invention, some improvements and modifications can also be made, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims (3)

1. modularization can the double Buck tandem cell charger main circuit topologies of connection in series-parallel, it is characterised in that the main circuit topology by The cascade of two-stage Buck chopper circuits forms;By full-bridge rectification module D in circuit1With filter capacitor C1Form AC/DC industrial frequency rectifying moulds Block, its input is 220V alternating currents, and output voltage is 310V direct currents;First order Buck buck choppers converter is by switching tube S1、 Diode D2, energy storage inductor L1And filter capacitor C2Form, its input is 310V DC voltages, is exported as through primary decompression DC voltage;Second level Buck buck choppers converter is by switching tube S2, diode D3, energy storage inductor L2And filter capacitor C3 Form.
2. modularization as claimed in claim 1 can the double Buck tandem cell charger main circuit topologies of connection in series-parallel, its feature exists In primary Buck circuit output voltages u2It is shown below:
<mrow> <msub> <mi>u</mi> <mn>2</mn> </msub> <mo>=</mo> <mfrac> <msub> <mi>t</mi> <mrow> <mn>1</mn> <mi>o</mi> <mi>n</mi> </mrow> </msub> <mrow> <msub> <mi>t</mi> <mrow> <mn>1</mn> <mi>o</mi> <mi>n</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>t</mi> <mrow> <mn>1</mn> <mi>o</mi> <mi>f</mi> <mi>f</mi> </mrow> </msub> </mrow> </mfrac> <msub> <mi>u</mi> <mn>1</mn> </msub> <mo>=</mo> <msub> <mi>&amp;alpha;</mi> <mn>1</mn> </msub> <msub> <mi>u</mi> <mn>1</mn> </msub> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
In formula, α1For primary switch pipe S1Raster data model PWM duty cycle, t1onAnd t1offRespectively switching tube S1When opening with shut-off Between;
Secondary Buck circuit output voltages u3It is shown below:
<mrow> <msub> <mi>u</mi> <mn>3</mn> </msub> <mo>=</mo> <mfrac> <msub> <mi>t</mi> <mrow> <mn>2</mn> <mi>o</mi> <mi>n</mi> </mrow> </msub> <mrow> <msub> <mi>t</mi> <mrow> <mn>2</mn> <mi>o</mi> <mi>n</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>t</mi> <mrow> <mn>2</mn> <mi>o</mi> <mi>f</mi> <mi>f</mi> </mrow> </msub> </mrow> </mfrac> <msub> <mi>u</mi> <mn>2</mn> </msub> <mo>=</mo> <msub> <mi>&amp;alpha;</mi> <mn>2</mn> </msub> <msub> <mi>u</mi> <mn>2</mn> </msub> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>
In formula, α2For secondary switch pipe S2Raster data model PWM duty cycle, t2onAnd t2offRespectively switching tube S2When opening with shut-off Between;
Output voltage u can be obtained more than3With u0Relation be shown below:
<mrow> <mtable> <mtr> <mtd> <mrow> <msub> <mi>u</mi> <mn>3</mn> </msub> <mo>=</mo> <msqrt> <mn>2</mn> </msqrt> <mfrac> <msub> <mi>t</mi> <mrow> <mn>1</mn> <mi>o</mi> <mi>n</mi> </mrow> </msub> <mrow> <msub> <mi>t</mi> <mrow> <mn>1</mn> <mi>o</mi> <mi>n</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>t</mi> <mrow> <mn>1</mn> <mi>o</mi> <mi>f</mi> <mi>f</mi> </mrow> </msub> </mrow> </mfrac> <mfrac> <msub> <mi>t</mi> <mrow> <mn>2</mn> <mi>o</mi> <mi>n</mi> </mrow> </msub> <mrow> <msub> <mi>t</mi> <mrow> <mn>2</mn> <mi>o</mi> <mi>n</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>t</mi> <mrow> <mn>2</mn> <mi>o</mi> <mi>f</mi> <mi>f</mi> </mrow> </msub> </mrow> </mfrac> <msub> <mi>u</mi> <mn>0</mn> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>=</mo> <msqrt> <mn>2</mn> </msqrt> <msub> <mi>&amp;alpha;</mi> <mn>1</mn> </msub> <msub> <mi>&amp;alpha;</mi> <mn>2</mn> </msub> <msub> <mi>u</mi> <mn>0</mn> </msub> </mrow> </mtd> </mtr> </mtable> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow>
Can must be by adjusting α by formula (3)1And α2Size, that is, adjustable output voltage size.
3. modularization as claimed in claim 1 can the double Buck tandem cell charger main circuit topologies of connection in series-parallel, its feature exists In two-stage converter output voltage current relationship used in parallel is shown below:
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>u</mi> <mn>1</mn> </msub> <mo>=</mo> <msub> <mi>u</mi> <mn>2</mn> </msub> <mo>=</mo> <msub> <mi>u</mi> <mn>3</mn> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>i</mi> <mn>3</mn> </msub> <mo>=</mo> <msub> <mi>i</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>i</mi> <mn>2</mn> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> <mo>.</mo> </mrow>
The two-stage converter output voltage current relationship being used in series is shown below:
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>u</mi> <mn>3</mn> </msub> <mo>=</mo> <msub> <mi>&amp;alpha;</mi> <mn>1</mn> </msub> <msub> <mi>&amp;alpha;</mi> <mn>2</mn> </msub> <msub> <mi>&amp;alpha;</mi> <mn>3</mn> </msub> <msub> <mi>&amp;alpha;</mi> <mn>4</mn> </msub> <msub> <mi>u</mi> <mn>0</mn> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>=</mo> <msub> <mi>&amp;alpha;</mi> <mn>3</mn> </msub> <msub> <mi>&amp;alpha;</mi> <mn>4</mn> </msub> <msub> <mi>u</mi> <mn>1</mn> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>=</mo> <msub> <mi>u</mi> <mn>2</mn> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>i</mi> <mn>1</mn> </msub> <mo>=</mo> <msub> <mi>i</mi> <mn>2</mn> </msub> <mo>=</mo> <msub> <mi>i</mi> <mn>3</mn> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>5</mn> <mo>)</mo> </mrow> <mo>.</mo> </mrow>
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CN113474986A (en) * 2019-02-27 2021-10-01 Abb电网瑞士股份公司 Buck-boost converter unit for MMC

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CN105141170A (en) * 2015-09-18 2015-12-09 江苏同芯电气科技有限公司 Long pulse large power high voltage power supply
CN108092520A (en) * 2016-11-14 2018-05-29 江苏同芯电气科技有限公司 Power-supply system is controlled in a kind of H bridge connection in series-parallel based on single charge circuit soon

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CN113474986A (en) * 2019-02-27 2021-10-01 Abb电网瑞士股份公司 Buck-boost converter unit for MMC
CN109803462A (en) * 2019-03-20 2019-05-24 苏州工业园区海沃科技有限公司 A kind of transformer dc heating power supply
CN109803462B (en) * 2019-03-20 2021-11-09 苏州工业园区海沃科技有限公司 Transformer direct current heating power supply
CN112039336A (en) * 2020-07-30 2020-12-04 珠海格力电器股份有限公司 Vehicle-mounted DC-DC conversion device and method and automobile
CN113437872A (en) * 2021-06-26 2021-09-24 中科华士电气科技南京有限公司 High-frequency auxiliary power supply based on multiple Buck circuits

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Application publication date: 20180420