CN103414338A - Bi-directional DCDC transformation circuit and bi-directional DCDC transformation device - Google Patents
Bi-directional DCDC transformation circuit and bi-directional DCDC transformation device Download PDFInfo
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- CN103414338A CN103414338A CN2013103088005A CN201310308800A CN103414338A CN 103414338 A CN103414338 A CN 103414338A CN 2013103088005 A CN2013103088005 A CN 2013103088005A CN 201310308800 A CN201310308800 A CN 201310308800A CN 103414338 A CN103414338 A CN 103414338A
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Abstract
The invention discloses a bi-directional DCDC transformation circuit and a bi-directional DCDC transformation device and relates to the field of power electronics. Power consumption of switching tubes can be reduced, and the transformation efficiency can be improved. The transformation circuit is arranged between a first direct current source and a second direct current source. The bi-directional DCDC transformation circuit comprises a bus capacitor which is formed by connecting a first capacitor and a second capacitor in series, a first half-bridge topology formed by connecting a first switching tube and a second switching tube in series, a second half-bridge topology formed by connecting a third switching tube and a fourth switching tube in series, a first inductor and a second inductor. The two ends of the bus capacitor are connected with the positive end and the negative end of the first direct current source respectively. One end of the first half-bridge topology is connected with the positive end of the first direct current source, and the other end of the first half-bridge topology is connected with an intermediate node. The other end connected with the intermediate node is further connected with the negative end of the second direct current source. A half-bridge midpoint is connected with the positive end of the second direct current source through the first inductor, one end of the second half-bridge topology is connected with the negative end of the first direct current source, the other end of the second half-bridge topology is connected with the positive end of the second direct current source, and the half-bridge midpoint is connected with the negative end of the second direct current source through the second inductor.
Description
Technical field
The present invention relates to field of power electronics, relate in particular to a kind of bidirectional DC/DC translation circuit and converting means.
Background technology
Bidirectional, dc, to DC converting (bi-directional DCDC converter, bidirectional DC/DC conversion) module (or circuit), is the technology of another kind of form direct current energy that a kind of direct current energy is converted to, mainly voltage, electric current is realized to conversion.It is widely used in fields such as regenerative resource, electric power system, traffic, space flight and aviation, computer and communication, household electrical appliance, defence and military, Industry Control.
For example, bidirectional DC/DC conversion (bi-directional DCDC converter) module can be used for shown in Figure 1 from consumption systems.From consumption systems, refer to oneself build Blast Furnace Top Gas Recovery Turbine Unit (TRT), the electric energy of its generation is the electric equipment power supply, for home services, namely generate power for their own use, it is the developing direction of distributed generation system, it comprises: photovoltaic module 11, power transfer (comprising: DC-to-DC power conversion module 121, direct current is to AC power conversion module 122, bidirectional, dc is to direct current power conversion module 123), energy-storage system 13(battery), distribution 14(Switch), load 15(household electrical appliance), public electric wire net 16, operation principle is: daytime, photovoltaic module 11 work, solar energy is to load 15 power supplies, and store energy in energy-storage system 13, if energy-storage system 13 has been full of, unnecessary electric energy can be transported to public electric wire net 16, in evening, under public electric wire net 16 disconnected, energy-storage system 13 discharged to power to load 15.Wherein, the solar DC low pressure that DC-to-DC power conversion module 121 was collected photovoltaic module 11 raises for high direct voltage, so that step-down type dc can work to AC power conversion module 122 after boost conversion; Direct current is the inversion conversion module to AC power conversion module 122, direct current is converted to alternating current and powers to AC load; Bidirectional, dc, to direct current power conversion module 123, completes charging control and the control of discharge function of battery.
The bidirectional DC/DC conversion module can be realized two functions of battery charging and discharging on same circuit, as shown in Figure 2, be a kind of existing bidirectional DC/DC conversion module: switching tube S
1And S
3The half-bridge topology formed is in parallel with bus capacitor C, and the half-bridge mid point of half-bridge topology is connected in DC source (being battery) by inductance L 1.The operation principle of bidirectional DC/DC conversion module is as follows: during the battery charging, half-bridge topology and inductance are Buck conversion work with buck topology, during battery discharge, half-bridge topology and inductance are Boost conversion work with Boost topology, two switching tubes in half-bridge topology are HF switch, these two switching tube alternations.In addition, the bidirectional DC/DC conversion module also comprises: switching tube S
2And S
4Form another half-bridge topology, with switching tube S
1And S
3The half-bridge topology parallel connection formed, purpose is to improve the transform power of bidirectional DC/DC conversion module.
The inventor finds existing bidirectional DC/DC conversion module, and there are the following problems at least: the duty ratio of circuit topology is little, peak current is large, cause inductance, switching tube loss large, the conversion efficiency of whole bidirectional DC/DC conversion module is low, for example, if adopt the 48V battery, during the voltage bus of 400～600V, duty ratio only has 0.1 left and right; And duty ratio is too small, also can cause the conversion module poor dynamic.
Summary of the invention
The invention provides a kind of bidirectional DC/DC translation circuit and converting means, dynamic characteristic is good, also can reduce simultaneously the power loss of switching tube, Lifting Transform efficiency.
For achieving the above object, the present invention adopts following technical scheme:
First aspect, embodiments of the invention provide a kind of bidirectional DC/DC translation circuit, be arranged between the first DC source and the second DC source, to the first DC source or the second DC source, supply with direct current power two-wayly, described bidirectional DC/DC translation circuit, comprise: the bus capacitor that the first electric capacity and the second capacitances in series form, the first half-bridge topology that the first switching tube and second switch pipe are composed in series, the second half-bridge topology that the 3rd switching tube and the 4th switching tube are composed in series, and first inductance and the second inductance
The two ends of described bus capacitor are connected to the positive and negative two ends of described the first DC source;
One end of described the first half-bridge topology is connected to the anode of described the first DC source, the other end is connected with the intermediate node between described the first electric capacity and described the second electric capacity, the other end be connected with described intermediate node also is connected with the negative terminal of described the second DC source, and the half-bridge mid point of described the first half-bridge topology is connected to the anode of described the second DC source by described the first inductance;
One end of described the second half-bridge topology is connected to the negative terminal of described the first DC source, and the other end is connected to the anode of described the second DC source, and the half-bridge mid point of described the second half-bridge topology is connected to the negative terminal of described the second DC source by described the second inductance.
In conjunction with first aspect, in the possible implementation of the first of first aspect, the two ends of the arbitrary switching tube in the described first, second, third and the 4th switching tube are parallel with diode or diode series connection group, and described diode series connection group is mutually connected and formed by a plurality of diodes.
In conjunction with the possible implementation of the first of first aspect, be with lower any one at diode described in the possible implementation of the second:
Schottky diode, fast recovery diode, silicone tube diode, silicon carbide diode.
In conjunction with the first or the possible implementation of the second of first aspect or first aspect, in the third possible implementation, the arbitrary switching tube in the described first, second, third and the 4th switching tube is with lower any one:
Field-effect transistor, insulated gate bipolar transistor, triode or thyristor.
In conjunction with first, second, third kind of first aspect or first aspect possible implementation, in the 4th kind of possible implementation, described the second DC source is with lower any one: battery, solar panels, capacitor.
In conjunction with any one possible implementation of first aspect or first aspect, in the 5th kind of possible implementation, described bidirectional DC/DC translation circuit also comprises:
The 3rd half-bridge topology that one or more and described the first half-bridge topology is identical, the 3rd inductance that one or more and described the first inductance is identical, and,
The 4th half-bridge topology that one or more and described the second half-bridge topology is identical, the 4th inductance that one or more and described the second inductance is identical;
One end of described the 3rd half-bridge topology all is connected to the anode of described the first DC source, the other end all with described the first electric capacity and described the second electric capacity between intermediate node be connected, the half-bridge mid point of described the 3rd half-bridge topology all is connected to the anode of described the second DC source by described the 3rd inductance;
One end of described the 4th half-bridge topology all is connected to the negative terminal of described the first DC source, the other end all is connected to the anode of described the second DC source, and the half-bridge mid point of described the two or four half-bridge topology all is connected to the negative terminal of described the second DC source by described the 4th inductance.
On the other hand, the present invention also provides a kind of bidirectional DC/DC converting means, comprises the described bidirectional DC/DC translation circuit of any one.
Bidirectional DC/DC translation circuit provided by the invention and converting means, during the battery charging, half-bridge topology and the first inductance that the first switching tube and second switch pipe form are Buck conversion work with buck topology, and half-bridge topology and the second inductance that the 3rd switching tube and the 4th switching tube form are Boost conversion work with Boost topology; During battery discharge, half-bridge topology and the first inductance that the first switching tube and second switch pipe form are Boost conversion work with Boost topology, and half-bridge topology and the second inductance that the 3rd switching tube and the 4th switching tube form are Buck conversion work with buck topology.During because of the battery charge or discharge, have first, second two half-bridge topologies to carry out dividing potential drop, the voltage at switching tube two ends is minimized, thereby has improved duty ratio.If PWM (Pulse Width Modulation) pattern is identical, in switch periods, under the identical prerequisite of average current, duty ratio is larger, and its current peak is less, and namely the transient current of switching tube when switch is less; And, due to the dividing potential drop of first, second two half-bridge topologies, the lower voltage at switching tube two ends; The instantaneous voltage of less switch transient current and lower switch will make the switching loss of switching tube reduce, thereby the conversion efficiency of bidirectional DC/DC translation circuit and device is improved.
The accompanying drawing explanation
Fig. 1 is a kind of structural representation from consumption systems;
Fig. 2 is a kind of structural representation of existing bidirectional DC/DC translation circuit;
The schematic diagram of the bidirectional DC/DC translation circuit that Fig. 3 provides for the embodiment of the present invention one;
Fig. 4 (a)～Fig. 4 (d) is respectively the working state schematic representation of bidirectional DC/DC translation circuit shown in Figure 3;
The schematic diagram of the DCDC translation circuit that Fig. 5 provides for the embodiment of the present invention two.
The accompanying drawing explanation
11-photovoltaic module, 121-DC-to-DC power conversion module,
The 122-direct current is to the AC power conversion module, and the 123-bidirectional, dc arrives the direct current power conversion module,
The 13-energy-storage system, 14-distribution, 15-load, 16-public electric wire net;
S
1-switching tube, S
2-switching tube, S
3-switching tube, S
4-switching tube, L
1-inductance, L
2-inductance, C-electric capacity;
21-the first DC source, 22-the second DC source, C1-the first electric capacity, C2-the second electric capacity,
S1-the first switching tube, S2-second switch pipe, S3-the 3rd switching tube, S4-the 4th switching tube,
L1-the first inductance, L2-the second inductance, L3-the 3rd inductance, L4-the 4th inductance,
The A-intermediate node, the half-bridge mid point of B-the first half-bridge topology, the half-bridge mid point of D-the second half-bridge topology,
The half-bridge mid point of E-the 3rd half-bridge topology, the half-bridge mid point of F-the 4th half-bridge topology.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making all other embodiment that obtain under the creative work prerequisite, belong to the scope of protection of the invention.
Embodiment mono-
The embodiment of the present invention provides a kind of bidirectional DC/DC translation circuit, as shown in Figure 3, the bidirectional DC/DC translation circuit is arranged between the first DC source 21 and the second DC source 22, to the first DC source 21 or the second DC source 22, supply with direct current power two-wayly, as shown in Figure 1, described bidirectional DC/DC translation circuit comprises: the bus capacitor that the first capacitor C 1 and the second capacitor C 2 are composed in series, the first half-bridge topology that the first switching tube S1 and second switch pipe S2 are composed in series, the second half-bridge topology that the 3rd switching tube S3 and the 4th switching tube S4 are composed in series and the first inductance L 1 and the second inductance L 2, the two ends of bus capacitor are connected to the positive and negative two ends of the first DC source 21, one end of the first half-bridge topology is connected to the anode of the first DC source 21, the other end is connected with the intermediate node A between the first capacitor C 1 and the second capacitor C 2, the other end be connected with intermediate node A also is connected with the negative terminal of the second DC source 22, the half-bridge mid point B of the first half-bridge topology is connected to the anode of the second DC source 22 by the first inductance L 1, wherein, intermediate node A is a bit on the first capacitor C 1 and the second capacitor C 2 lines, one end of the second half-bridge topology is connected to the negative terminal of the first DC source 21, and the other end is connected to the anode of the second DC source 22, and the half-bridge mid point D of the second half-bridge topology is connected to the negative terminal of the second DC source 22 by the second inductance L 2.
Wherein, described the first DC source 21 of the present embodiment and the second DC source 22 can be thought invariable voltage source, and for example the second DC source 22 can be battery, solar panels, the various devices that direct current is provided such as capacitor.Wherein said battery includes but not limited to the various batteries such as fuel cell, Ni-MH battery, iron cell, lead-acid battery, and that the signal of the second DC source 22 ends outputs includes but not limited to is square, sinusoidal, triangle, sawtooth waveforms etc.
Wherein, the arbitrary switching tube in the present embodiment described first, second, third and the 4th switching tube is HF switch, and two switching tubes during work in each half-bridge topology are alternately opened.Alternatively, the switching tube in the present embodiment can be with lower any one: field-effect transistor, insulated gate bipolar transistor, triode or thyristor.
The bidirectional DC/DC translation circuit that the embodiment of the present invention provides, during the battery charging, half-bridge topology and inductance L 1 that the first switching tube and second switch pipe form are Buck conversion work with buck topology, and half-bridge topology and inductance L 2 that the 3rd switching tube and the 4th switching tube form are Boost conversion work with Boost topology; During battery discharge, half-bridge topology and inductance L 1 that the first switching tube and second switch pipe form are Boost conversion work with Boost topology, and half-bridge topology and inductance L 2 that the 3rd switching tube and the 4th switching tube form are Buck conversion work with buck topology.During because of the battery charge or discharge, there are first, second two half-bridge topologies to carry out dividing potential drop, so the voltage at switching tube two ends is minimized, the transient current of switching tube when switch reduces, can reduce the duty ratio of switching tube, reduce the power loss of switching tube, thereby promote the conversion efficiency of bidirectional DC/DC translation circuit.
In addition, particularly, the two ends of the arbitrary switching tube in the described first, second, third and the 4th switching tube are parallel with diode or diode series connection group, and described diode series connection group is mutually connected and formed by a plurality of diodes.With the diode of paralleled power switches, can, in the Dead Time action (or work) of two switching tube conductings of half-bridge topology, maintain the inductance afterflow.Wherein, described diode is Schottky diode, fast recovery diode, silicone tube diode, any one in silicon carbide diode.Certainly, arbitrary switching tube and the diode in parallel with it can be function elements independently separately, can be also for example switching tube parasitic diodes of a device combining.
Below in conjunction with accompanying drawing 4(a)～Fig. 4 (d) is described in detail the course of work of the bidirectional DC/DC translation circuit that the present embodiment provides, and wherein the second DC source 22 is battery:
(1) in the first DC source 21, supply with direct current power (during the battery charging) to the second DC source 22:
The first operating state (Ton constantly) at the bidirectional DC/DC translation circuit, the first switching tube S1 in the first half-bridge topology opens, second switch pipe S2 closes, and the current direction in the first half-bridge topology is the first capacitor C 1 → the first switching tube S1 → first inductance L 1 → battery → first capacitor C 1; The 4th switching tube S4 in the second half-bridge topology opens, and the 3rd switching tube S3 closes, and the current direction in the second half-bridge topology is the second capacitor C 2 → the second inductance L 2 → the 4th switching tube S4 → second capacitor C 2, as shown in Figure 4 (a).
The second operating state (Toff constantly) at the bidirectional DC/DC translation circuit, second switch pipe S2 in the first half-bridge topology opens, the first switching tube S1 closes, and the current direction in the first half-bridge topology is first inductance L 1 → battery → second switch pipe S2 → first inductance L 1; The 3rd switching tube S3 in the second half-bridge topology opens, and the 4th switching tube S4 closes, and the current direction in the second half-bridge topology is the second inductance L 2 → the 3rd switching tube S3 → battery → second inductance L 2, as shown in Figure 4 (b).
(2) in the second DC source 22, supply with direct current power (during battery discharge) to the first DC source 21:
In the 3rd operating state (Ton constantly) of bidirectional DC/DC translation circuit, the second switch pipe S2 in the first half-bridge topology opens, and the first switching tube S1 closes, and the current direction in the first half-bridge topology is battery → first inductance L 1 → second switch pipe S2 → battery; The 3rd switching tube S3 in the second half-bridge topology opens, and the 4th switching tube S4 closes, and the current direction in the second half-bridge topology is battery → the 3rd switching tube S3 → second inductance L 2 → battery, as shown in Figure 4 (c).
The 4th operating state (Toff constantly) at the bidirectional DC/DC translation circuit, the first switching tube S1 in the first half-bridge topology opens, second switch pipe S2 closes, and the current direction in the first half-bridge topology is the first inductance L 1 → the first switching tube S1 → first capacitor C 1 → battery → first inductance L 1; The 4th switching tube S4 in the second half-bridge topology opens, and the 3rd switching tube S3 closes, and the current direction in the second half-bridge topology is the second inductance L 2 → the second capacitor C 2 → the 4th switching tube S4 → second inductance L 2, as shown in Fig. 4 (d).
It should be noted that, in Fig. 4 (a)～Fig. 4 (d), the square-wave signal of switching tube S1, S2, S3, S4 adjacency mark is the corresponding driving signal of switching tube constantly.
According to top described, during because of the battery charge or discharge, there are first, second two half-bridge topologies to carry out dividing potential drop, the voltage at switching tube two ends is minimized, thereby improves duty ratio.Particularly, if adopt 48V battery (V
bat=48V) time, the voltage bus (V of 500V
bus=500V): the duty ratio D=V that considers the buck topology
out/ V
In, according to prior art (with reference to Fig. 2), the duty ratio of buck topology is D=48/500=0.096; According to the embodiment of the present invention (with reference to Fig. 4 (a) and Fig. 4 (b)), buck topology duty ratio is D=48/(500/2)=0.192, be 0.096 twice.At PWM (Pulse Width Modulation), in the pattern same switch cycle, meet in the situation of same average current, duty ratio is larger, and its current peak is less, and namely the transient current of switching tube when switch is less; Due to the dividing potential drop of first, second two half-bridge topologies, the lower voltage at switching tube two ends; The instantaneous voltage of less switch transient current and lower switch will obtain switching tube than low switching losses.
Prior art can obtain large step-up ratio, but efficiency is very low, and the bidirectional DC/DC translation circuit that the present embodiment provides, when obtaining large step-up ratio, because of the voltage at switching tube two ends, be half of busbar voltage, the power loss of switching tube is little, so conversion efficiency is higher.
Embodiment bis-
The embodiment of the present invention provides another kind of bidirectional DC/DC translation circuit, as shown in Figure 5, with the difference part of bidirectional DC/DC translation circuit shown in embodiment mono-, be, the described translation circuit of the present embodiment also comprises: one or more three half-bridge topologies identical with the first half-bridge topology, the 3rd inductance L 3 that one or more and described the first inductance is identical and, the 4th half-bridge topology that one or more and described the second half-bridge topology is identical, the 4th inductance L 4 that one or more and described the second inductance is identical; One end of the 3rd half-bridge topology all is connected to the anode of the first DC source 21, the other end all with the first capacitor C 1 and the second capacitor C 2 between intermediate node A be connected, the half-bridge mid point E of the 3rd half-bridge topology all is connected to the anode of the second DC source 22 by the 3rd inductance L 3; One end of the 4th half-bridge topology all is connected to the negative terminal of the first DC source 21, and the other end all is connected to the anode of the second DC source 22, and the half-bridge mid point F of the two or four half-bridge topology all is connected to the negative terminal of the second DC source 22 by the 4th inductance L 4.
Shown in Figure 5, respectively to increase the 3rd half-bridge topology and the 4th half-bridge topology at first, second half-bridge topology, certainly, in concrete enforcement, can at first, second half-bridge topology, increase respectively a plurality of pairs of half-bridge topology parallel connections as required, to increase transform power, its operation principle is consistent with the bidirectional DC/DC translation circuit be comprised of first, second half-bridge topology in embodiment mono-, does not repeat them here.
Embodiment tri-
The embodiment of the present invention also provides a kind of converting means, comprises the described bidirectional DC/DC translation circuit of any one in embodiment mono-and embodiment bis-.The described converting means of the present embodiment, the power loss of switching tube reduces, and conversion efficiency is high, and the dynamic characteristic of output signal is good, can be used for that inversion, photovoltaic power transformation are grid-connected, electric automobile, variable frequency control etc.
The described converting means of the present embodiment, also can comprise producing the circuit of the control signal of control switch pipe.
Through the above description of the embodiments, the those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential common hardware, can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium can read, floppy disk as computer, hard disk or CD etc., comprise some instructions with so that computer equipment (can be personal computer, server, or the network equipment etc.) carry out the described method of each embodiment of the present invention.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (7)
1. a bidirectional DC/DC translation circuit, be arranged between the first DC source and the second DC source, to the first DC source or the second DC source, supplies with direct current power two-wayly, it is characterized in that,
Described bidirectional DC/DC translation circuit, comprise: the bus capacitor that the first electric capacity and the second capacitances in series form, the first half-bridge topology that the first switching tube and second switch pipe are composed in series, the second half-bridge topology that the 3rd switching tube and the 4th switching tube are composed in series, and the first inductance and the second inductance;
The two ends of described bus capacitor are connected to the positive and negative two ends of described the first DC source;
One end of described the first half-bridge topology is connected to the anode of described the first DC source, the other end is connected with the intermediate node between described the first electric capacity and described the second electric capacity, the other end be connected with described intermediate node also is connected with the negative terminal of described the second DC source, and the half-bridge mid point of described the first half-bridge topology is connected to the anode of described the second DC source by described the first inductance;
One end of described the second half-bridge topology is connected to the negative terminal of described the first DC source, and the other end is connected to the anode of described the second DC source, and the half-bridge mid point of described the second half-bridge topology is connected to the negative terminal of described the second DC source by described the second inductance.
2. circuit according to claim 1, it is characterized in that, the two ends of the arbitrary switching tube in the described first, second, third and the 4th switching tube are parallel with diode or diode series connection group, and described diode series connection group is mutually connected and formed by a plurality of diodes.
3. circuit according to claim 2, is characterized in that, described diode is with lower any one:
Schottky diode, fast recovery diode, silicone tube diode, silicon carbide diode.
4. circuit according to claim 1, is characterized in that, the arbitrary switching tube in the described first, second, third and the 4th switching tube is with lower any one:
Field-effect transistor, insulated gate bipolar transistor, triode or thyristor.
5. circuit according to claim 1, is characterized in that, described the second DC source is with lower any one: battery, solar panels, capacitor.
6. according to the described circuit of claim 1-5 any one, it is characterized in that, also comprise:
The 3rd half-bridge topology that one or more and described the first half-bridge topology is identical, the 3rd inductance that one or more and described the first inductance is identical, and,
The 4th half-bridge topology that one or more and described the second half-bridge topology is identical, the 4th inductance that one or more and described the second inductance is identical;
One end of described the 3rd half-bridge topology all is connected to the anode of described the first DC source, the other end all with described the first electric capacity and described the second electric capacity between intermediate node be connected, the half-bridge mid point of described the 3rd half-bridge topology all is connected to the anode of described the second DC source by described the 3rd inductance;
One end of described the 4th half-bridge topology all is connected to the negative terminal of described the first DC source, the other end all is connected to the anode of described the second DC source, and the half-bridge mid point of described the two or four half-bridge topology all is connected to the negative terminal of described the second DC source by described the 4th inductance.
7. a converting means, is characterized in that, comprises the described bidirectional DC/DC translation circuit of claim 1-6 any one.
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| CN108476571A (en) * | 2016-01-21 | 2018-08-31 | 飞利浦照明控股有限公司 | Driver for driving at least two groups solid-state lighting elements and method |
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| US10243455B2 (en) | 2015-02-02 | 2019-03-26 | Santak Electronic (Shenzhen) Co., Ltd. | Bidirectional DC-DC converter |
| CN104901536A (en) * | 2015-06-08 | 2015-09-09 | 南车青岛四方机车车辆股份有限公司 | Bidirectional DC-DC voltage boosting and reduction system and energy storage system |
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| CN107086781A (en) * | 2017-05-23 | 2017-08-22 | 深圳市盛弘电气股份有限公司 | A kind of topological circuit and common-mode voltage suppressing method of three level DCDC current transformers |
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