CN204993064U - Take coupling inductance's high -power two -way DCDC converter of buck -Boost type - Google Patents
Take coupling inductance's high -power two -way DCDC converter of buck -Boost type Download PDFInfo
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- CN204993064U CN204993064U CN201520454123.2U CN201520454123U CN204993064U CN 204993064 U CN204993064 U CN 204993064U CN 201520454123 U CN201520454123 U CN 201520454123U CN 204993064 U CN204993064 U CN 204993064U
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Abstract
The utility model discloses a take coupling inductance's high -power two -way DCDC converter of buck -Boost type, its characterized in that constitutes by the two -way buck -Boost circuit in N way is parallelly connected, N >= 2, and N is natural number, respectively the inductance adoption magnetism coupling inductance of two -way buck -Boost circuit. The utility model discloses a coupling inductance, this inductance under the same parallelly connected common mode inductance's condition, have the differential mode flow equalize the inductance big, flow equalize effectually, install small, small in noise and a great deal of advantage such as efficient, can improve equivalent switching frequency, high conversion efficiency is carried to reduction work noise and inductance volume. The utility model discloses the DCDC converter can step up on single direction and also can step down, so the range of application is very extensive.
Description
Technical field
The utility model relates to the fields such as electric automobile, super capacitor and battery energy storage, particularly relates to the two-way DC/DC converter of a kind of Buck-Boost type with coupling inductance.
Background technology
In lack of energy and environmental pollution day by day serious today, increasing pure electric automobile and hybrid power type automobile come into the market.But due to the development bottleneck of power battery technology, the terminal voltage of vapour Vehicular dynamic battery is designed between 180V ~ 720V usually, and the best DC bus-bar voltage of inverter is usually at about 600V, in order to mate electrokinetic cell voltage and DC bus-bar voltage, reduce the ripple current of electrokinetic cell, improve the runnability of whole power drive system, present pure electronic and hybrid power type automobile all adds the two-way DC/DC converter of one-level between DC bus and electrokinetic cell.
Electrokinetic cell electric pressure and DC bus-bar voltage grade quite (voltage ratio is no more than 3.5) and without the need to electrical isolation time, usually select single-phase non-isolated two-way DC/DC converter to the mutual transmission of the coupling and energy between the two that complete electrokinetic cell voltage and DC bus-bar voltage, realize the charging/discharging function of battery, to improve the whole efficiency of system.Nowadays the EHV electric and hybrid vehicle major part of main flow adopts the two-way DC/DC converter of Boost type or Buck-Boost type DC/DC converter to carry out matching voltage grade.
Prior art one
Single-phase non-isolated Boost type converter, as shown in Figure 1.Usually super capacitor or chemical cell are received DC1 side, DC side after the DC side of DC2 side joint electric automobile inverter or charging rectifier, or the direct current input side of double source trackless automobile, if the voltage of DC2 side is lower than DC1 side, then cannot complete DC2 side to DC1 side charge function, and the now electric discharge of DC1 side to DC2 side is uncontrollable.
Prior art two
Single-phase non-isolated Buck-Boost type DC/DC converter, its structure chart as shown in Figure 2.Because these structure both sides are symmetrical, DC1 side both can connect super capacitor, also can connect the DC side of electric automobile inverter.Although this structure can solve the problems referred to above of Boost type, this converter can only in middle low power applications.
Summary of the invention
The purpose of this utility model be exactly in order to overcome above-mentioned prior art exist defect and a kind of multi-channel parallel Buck-Boost type high-power bidirectional DC/DC converter with coupling inductance is provided, the two-way liter of voltage can be fallen, and makes this converter applications occasion extensive.
The utility model specifically adopts following technical scheme:
The two-way DC/DC converter of Buck-Boost type with coupling inductance, it is characterized in that being made up of the two-way Buck-Boost circuit in parallel in N road, N >=2, and N is natural number, and the inductance of each two-way Buck-Boost circuit adopts magnetic coupling inductance.
Preferably, converter two DC side circuit structure is symmetrical.
Another preferably, described magnetic coupling inductance adopts forward coupled modes.
Of the present utility modelly heterogeneously rise the Buck-Boost type DC/DC converter that can fall, mainly be used in energy storage and the electric automobile fields such as the discharge and recharge of super capacitor or chemical cell, if the voltage of super capacitor or chemical cell exceedes the direct voltage of inverter, then reduction voltage circuit (i.e. reverse booster circuit) is adopted to realize the charging/discharging function of super capacitor; If the voltage of super capacitor or chemical cell is lower than the direct voltage of inverter, then booster circuit (i.e. reverse reduction voltage circuit) is adopted to realize the charging/discharging function of super capacitor.If when this DC/DC circuit power demand is larger, need to adopt the parallel connection of multichannel (phase) DC/DC unit to improve capacity.Independently reactor is often adopted to carry out filtering in existing DC/DC unit, cause whole DC/DC volume large like this, reactor noise is large, even if adopt crisscross parallel to control between each DC/DC unit, the noise reduction of each reactor can not be made, if improve the switching frequency of each DC/DC unit to reduce noise, then loss becomes large, and efficiency reduces.And the utility model adopts coupling inductance, this inductance is under the condition of identical common mode inductance in parallel, have that differential mode current sharing inductor is large, current-sharing is effective, the plurality of advantages such as device volume is little, noise is little and efficiency is high, equivalent switching frequency can be improved, reduce work noise and inductance volume, improve conversion efficiency.
The utility model adopts Buck-Boost two-stage Circuit tuning, this converter can be worked in very wide input voltage and output voltage range, also according to load power demand, can adjust the module number of parallel operation, to improve the whole efficiency of system.
The convenient capacity being improved DC/DC by the introducing of multiphase interleaving technology of the utility model, input and output ripple can be reduced simultaneously, thus reduce the size of input and output filter, reduce the current stress of power device, optimal design can be carried out, to improve transducer effciency by the introducing of many algorithms.
The utility model DC/DC converter can boost in a single direction also can step-down, therefore it is general to be of wide application.
Accompanying drawing explanation
Fig. 1 is the two-way DC/DC converter of single phase boost type.
Fig. 2 is the two-way DC/DC converter of Single-Phase Buck-Boost.
Fig. 3 is the two-way DC/DC converter of the utility model Buck-Boost type.
Fig. 4 is the two-way DC/DC converter of three-phase Buck-Boost type.
Fig. 5 is coupling induction structure schematic diagram.
Fig. 6 is multiphase coupled induction structure schematic diagram.
Fig. 7 is coupling inductance equivalent magnetic circuit.
Fig. 8 coupling inductance works alone magnetic flux figure.
The multiphase coupled inductance equivalent magnetic circuit of Fig. 9.
Embodiment
Below in conjunction with specific embodiment, the utility model is further detailed.
Embodiment one
As can be seen from Figure 3 the utility model circuit is formed by N road (N >=2) two-way Buck-Boost circuit in parallel, what adopt in circuit is N road coupling inductance, and two DC side DC1 sides and DC2 lateral circuit structure full symmetric, namely the voltage of DC1 side both can than the height of DC2 side, also can be lower than the voltage of DC2 side.Therefore the utility model DC converter application extensively (as electric automobile, battery energy storage field).Brief analysis the utility model circuit working process below.
Three-phase Buck-Boost type two-way DC/DC converter circuit topological structure as shown in Figure 4.Three-phase circuit can introduce alternating expression control mode, and it mainly refers to that each phase module carrier operation frequency is identical, the operational mode staggered mutually in phase angle, and often the time of being staggered is 1/3rd (the N phases then for N/mono-) in cycle to three-phase.Namely drive singal time delay 1/3rd cycle of A circuitry phase module is the drive singal of B circuitry phase module, C phase drive singal also time delay B phase 1/3rd cycle.Therefore the course of work of three-phase DC converter can be regarded three single-phase invertors as and to interlock work, the topological structure of the two-way DC/DC converter of Buck-Boost as shown in Figure 2.
The mode of operation of single-phase Buck-Boost circuit is determined by DC1 and DC2 side connected equipment type (as storage battery, super capacitor, motor), roughly can be divided into four kinds of operating states.1. forward step-down state.Under this state, the voltage of DC1 side is higher than DC2 side, and the sense of current is that DC1 effluent is to DC2 side.Now S1 works on off state, the anti-also diode operation of S3; 2. forward pressure-increasning state.Under this state, the voltage of DC1 side is lower than DC2 side, and the sense of current is that DC1 effluent is to DC2 side.Now S1 is in conducting state always, and S3 keeps last status of processes constant, and S4 is on off state; 3. reverse step-down state.Under this state, the voltage of DC1 side is higher than DC2 side, and the sense of current is that DC2 effluent is to DC1 side.Under this state, S3 is on off state, the anti-also diode operation of S1.The duty ratio of S3 is determined by both voltage ratios; 4. oppositely to boost transition.Under this state, the voltage of DC2 side is higher than DC1 side, and the sense of current is that DC2 effluent is to DC1 side.S3 conducting always under current state, S2 is on off state, and S1 keeps last process status constant.
The lifting/voltage reducing inductance of three-phase circuit does not adopt stand-alone configuration, but adopts coupling inductance.Be about to many group coil windings on same magnetic core.Owing to adopting alternating expression to control, therefore the equivalent frequency in known coupling inductance is three times (N phase is N times) of switching frequency.As shown in Figure 5, the structural representation of multiphase coupled inductance as shown in Figure 6 for the structural representation of coupling inductance.Due to take be forward coupling mode, so the magnetomotive direction produced in coil is identical, as shown in Figure 7, coupling inductance works alone magnetic circuit schematic diagram as shown in Figure 8 to its equivalent magnetic circuit.As can be seen from Figure 8 the magnetic flux at side column place is superposition, and the magnetic flux of three newels is cancelled out each other.If three-phase magnetomotive force value is equal, then in figure, the magnetic flux at R1, R5 place is 1.5 times of R2, R3, R4, and equivalent flux value is less than discrete flux value, thus reduces the size of magnetic core.The equivalent magnetic circuit of multiphase coupled inductance as shown in Figure 9.
Claims (3)
1. the Buck-Boost type high-power bidirectional DC/DC converter with coupling inductance, it is characterized in that being made up of the two-way Buck-Boost circuit in parallel in N road, N >=2, and N is natural number, and the inductance of each two-way Buck-Boost circuit adopts magnetic coupling inductance.
2. the Buck-Boost type high-power bidirectional DC/DC converter as claimed in claim 1 with coupling inductance, is characterized in that converter two DC side circuit structure is symmetrical.
3. the Buck-Boost type high-power bidirectional DC/DC converter as claimed in claim 1 with coupling inductance, is characterized in that described magnetic coupling inductance adopts forward coupled modes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520454123.2U CN204993064U (en) | 2015-06-29 | 2015-06-29 | Take coupling inductance's high -power two -way DCDC converter of buck -Boost type |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520454123.2U CN204993064U (en) | 2015-06-29 | 2015-06-29 | Take coupling inductance's high -power two -way DCDC converter of buck -Boost type |
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| CN204993064U true CN204993064U (en) | 2016-01-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048817A (en) * | 2015-06-29 | 2015-11-11 | 江苏同芯电气科技有限公司 | Buck-Boost type high-power bidirectional DC/DC converter with coupled inductors |
| US9960699B2 (en) | 2016-09-29 | 2018-05-01 | Delta Electronics, Inc. | Power supply system with plural parallel modules and loop current limiting |
| CN110994993A (en) * | 2019-12-30 | 2020-04-10 | 施耐德电气（中国）有限公司 | Multichannel bidirectional buck-boost circuit |
-
2015
- 2015-06-29 CN CN201520454123.2U patent/CN204993064U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048817A (en) * | 2015-06-29 | 2015-11-11 | 江苏同芯电气科技有限公司 | Buck-Boost type high-power bidirectional DC/DC converter with coupled inductors |
| US9960699B2 (en) | 2016-09-29 | 2018-05-01 | Delta Electronics, Inc. | Power supply system with plural parallel modules and loop current limiting |
| CN110994993A (en) * | 2019-12-30 | 2020-04-10 | 施耐德电气（中国）有限公司 | Multichannel bidirectional buck-boost circuit |
| CN110994993B (en) * | 2019-12-30 | 2021-01-29 | 施耐德电气（中国）有限公司 | Multichannel bidirectional buck-boost circuit |
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| C14 | Grant of patent or utility model | ||
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160206 Address after: Xianlin Xianlin University City Street Road in Qixia District of Nanjing City, Jiangsu Province, No. 99 210023 Patentee after: CQC-TRUSTED TESTING TECHNOLOGY CO., LTD. Patentee after: Zhou Xiwen Address before: Jiangning District of Nanjing City, Jiangsu province 211111 streets moling Road No. 12 mo Zhou Patentee before: Jiangsu is with the electric Science and Technology Ltd. of core Patentee before: Zhou Xiwen |
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| CB03 | Change of inventor or designer information |
Inventor after: Zhou Xiwen Inventor after: Chen Di Inventor after: Tan Haonan Inventor after: Zhang Hui Inventor after: Ma Huafeng Inventor before: Zhou Xiwen Inventor before: Tan Haonan Inventor before: Zhang Hui Inventor before: Ma Huafeng |
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| COR | Change of bibliographic data |