CN203014662U - Parallel current equalizing circuit and inverter - Google Patents
Parallel current equalizing circuit and inverter Download PDFInfo
- Publication number
- CN203014662U CN203014662U CN 201220622264 CN201220622264U CN203014662U CN 203014662 U CN203014662 U CN 203014662U CN 201220622264 CN201220622264 CN 201220622264 CN 201220622264 U CN201220622264 U CN 201220622264U CN 203014662 U CN203014662 U CN 203014662U
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- copper bar
- output copper
- magnet unit
- equalizing circuit
- parallel
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Abstract
The utility model provides a parallel current equalizing circuit. The parallel current equalizing circuit comprises a number of parallel power units and a number of alternating current output copper bars which are respectively connected with the power units. The number of the power units is equal to the number of the alternating current output copper bars. A number of alternating current output copper bars are connected in parallel to form a path of alternating current output. The parallel current equalizing circuit further comprises a number of magnetic units. Each magnetic unit is arranged on an alternating current output copper bar, so as to increase the impedance value of the alternating current output copper bar which is provided with the magnetic unit. The impedance values of all alternating current output copper bars are equal. Accordingly, the utility model provides an inverter which comprises the parallel current equalizing circuit. The parallel circuit provided by the utility model can improve the current equalizing degree between the parallel power units, and has the advantages of small volume, low cost and wide application range.
Description
Technical field
The utility model relates to electric and electronic technical field, is specifically related to a kind of parallel current-sharing
Circuit, and the inverter that comprises described parallel current-equalizing circuit.
Background technology
For the design of high-power inverter (direct current energy being transformed into the device of alternating current), single power cell is difficult to satisfy the requirement of output current, tends to adopt a plurality of power cell parallel connections to improve the scheme of output current.and when adopting a plurality of power cells in parallel, consider heat radiation, the restriction of the factors such as structure, generally need larger spacing between power cell, be that layout will be disperseed, make the length that exchanges the output copper bar that is connected with each power cell generally long, and be difficult to accomplish symmetry on structure, the impedance that causes each to exchange the output copper bar is inconsistent, thereby cause the not current-sharing of output current between each power cell in parallel, and make indivedual power cells bear larger electric current (even overcurrent), this is larger potential safety hazard for moving reliably and with long-term of inverter, so should avoid the not current-sharing of output current between in parallel each power cell as far as possible.
At present, solve the solution commonly used of the uneven flow problem of output current between each power cell in parallel for adopting current sharing inductor, what namely be connected with each power cell exchanges the output copper bar current sharing inductor of all connecting, and the other end of current sharing inductor is connected in parallel as final ac output end.When adopting this scheme of current sharing inductor, current sharing inductor often needs larger sense value, and (inductance value is larger, resistance value is also larger), exchange the output copper bar because of the inconsistent impact that equal mobility is caused of its impedance to weaken each, but, the current sharing inductor that the sense value is larger bulky, cost is also high.
The utility model content
Technical problem to be solved in the utility model is for existing defects in prior art, provide a kind of and can improve the equal mobility between power cell in parallel and volume is little, cost is low parallel current-equalizing circuit, and the inverter that comprises described parallel current-equalizing circuit.
The technical scheme that solution the utility model technical problem adopts is:
Described parallel current-equalizing circuit comprises the power cell of a plurality of parallel connections and a plurality of output copper bars that exchange that are attached thereto respectively, described power cell equates with the quantity that exchanges the output copper bar, form one the tunnel after the parallel connection of described a plurality of interchange output copper bar and exchange output, wherein, described parallel current-equalizing circuit also comprises a plurality of magnet units, each magnet unit is installed in one and exchanges on the output copper bar, to increase the resistance value of this interchange output copper bar that magnet unit is installed, and make each resistance value that exchanges the output copper bar all equate, thereby reach the purpose that exchanges the output current-sharing.
Preferably, the quantity of described magnet unit equates with the quantity that exchanges the output copper bar, and each resistance value that the interchange output copper bar of magnet unit is installed is equal to reference impedance value, and described reference impedance value is greater than the maximum impedance value of described a plurality of interchange output copper bars when magnet unit is not installed.
Perhaps, the quantity of described magnet unit is less than the quantity that exchanges the output copper bar, the maximum impedance value of described a plurality of interchange output copper bars when magnet unit is not installed is as the reference resistance value, on the interchange output copper bar of described a plurality of interchange output copper bar middle impedance values less than reference impedance value, magnet unit is installed all, and each resistance value that exchanges the output copper bar that magnet unit is installed is equal to described reference impedance value.
Preferably, described power cell comprises a power model, and perhaps, described power cell comprises a plurality of series connection and/or power model in parallel; Described power model comprises power semiconductor.
Preferably, described power semiconductor adopts insulated gate bipolar transistor or mos field effect transistor.
Preferably, described magnet unit is set in and exchanges on the output copper bar, and the endoporus sidewall of described magnet unit does not contact with the outer surface that exchanges the output copper bar.
Preferably, be provided with air gap on described magnet unit.
Perhaps, on described magnet unit, air gap is not set.
Preferably, the endoporus of described magnet unit is shaped as circle or polygon.
The utility model also provides a kind of inverter, and it comprises above-mentioned parallel current-equalizing circuit.
Beneficial effect:
1) parallel current-equalizing circuit described in the utility model only needs on all or part of interchange output copper bar, the impedance matching situation that magnet unit just can improve each interchange output copper bar to be installed therein, and the electric current that makes each power cell output reaches balanced, thereby improve the equal mobility between power cell in parallel, and do not need the structure that exchanges output copper bar self is made any improvement, therefore simple in structure, applied widely;
when 2) in parallel current-equalizing circuit described in the utility model, the resistance value of each interchange output copper bar is less than reference impedance value (described reference impedance value is more than or equal to the maximum impedance value of described a plurality of interchanges output copper bars when magnet unit is not installed), need magnet unit is installed so that exchange the resistance value of output copper bar and be equal to reference impedance value, that is to say, the effect of magnet unit is, make the resistance value of the interchange output copper bar that magnet unit is installed be equal to reference impedance value, and each exchanges that the resistance value of output copper bar when magnet unit is not installed differs and not quite, therefore the requirement to magnet unit is lower, when for example magnet unit adopts magnet ring, its single turn induction reactance value is less, make the volume of the parallel current-equalizing circuit that adopts said structure little, cost compare is low.
Description of drawings
Fig. 1 is the structural representation of parallel current-equalizing circuit in the utility model embodiment 2;
Fig. 2 is the structural representation of parallel current-equalizing circuit in the utility model embodiment 3.
Embodiment
For making those skilled in the art understand better the technical solution of the utility model, to the utility model parallel current-equalizing circuit, and comprise that the inverter of described parallel current-equalizing circuit is described in further detail below in conjunction with the drawings and specific embodiments.
Embodiment 1:
the present embodiment provides a kind of parallel current-equalizing circuit, and it comprises the power cell of a plurality of parallel connections, a plurality of interchange output copper bar and a plurality of magnet unit, described power cell equates with the quantity that exchanges the output copper bar, and each power cell all exchanges the output copper bar with one connected, form one the tunnel after the parallel connection of described a plurality of interchange output copper bar and exchange output, each magnet unit is installed in one and exchanges on the output copper bar, to increase the resistance value of this interchange output copper bar that magnet unit is installed, make each resistance value that exchanges the output copper bar all equate, and make the electric current of each power cell output in parallel equate, thereby overcome the uneven flow problem of the asymmetric output that causes of structure that exchanges the output copper bar due to each, improved the equal mobility between power cell in parallel, and do not need the structure that exchanges output copper bar self is made any improvement.
Preferably, described power cell comprises a power model, and perhaps, described power cell comprises a plurality of series connection and/or power model in parallel; Described power model comprises power semiconductor.Preferably, described power semiconductor adopts insulated gate bipolar transistor (IGBT, Insulated Gate Bipolar Transistor) or mos field effect transistor (MOSFET, Metal Oxide Semiconductor FieldEffect Transistor).
Preferably, described magnet unit is set in and exchanges on the output copper bar, and the endoporus sidewall of described magnet unit does not contact with the outer surface that exchanges the output copper bar.
In order to prevent magnetic saturation, be provided with air gap on preferred described magnet unit.If the magnetic saturation phenomenon can not occur, on preferred described magnet unit, air gap is not set.
Preferably, the endoporus of described magnet unit is shaped as circle or polygon.For example, described magnet unit employing magnet ring (when the endoporus that is magnet unit is circular), described magnet ring are set in and exchange on the output copper bar, i.e. interchange is exported copper bar and passed magnet ring.Described magnet ring generally uses Ferrite Material (nickel-zinc ferrite or manganese-zinc ferrite) or the material of other high magnetic permeability to make.
Preferably, described interchange output copper bar adopts hard copper or copper alloy to make, and perhaps adopts flexible cable to make.
The present embodiment also provides a kind of inverter that comprises above-mentioned parallel current-equalizing circuit.
Embodiment 2:
As shown in Figure 1, in the present embodiment, described magnet unit adopts magnet ring, and described magnet ring is set in and exchanges on the output copper bar.
Described parallel current-equalizing circuit comprises N power cell, N interchange output copper bar and N magnet ring, and N is the positive integer more than or equal to 2, and namely the quantity of described power cell, interchange output copper bar and magnet ring all equates.In Fig. 1, Z
NRepresent N resistance value that exchanges the output copper bar.
Wherein, a described N power cell is all in parallel with both positive and negative polarity direct-flow input end DC+ and DC-, each power cell all exchanges the output copper bar and is connected with one, and each exchanges on output copper bar and all be arranged with a magnet ring, and described N exchanges and form one tunnel interchange after the parallel connection of output copper bar and export.
For the electric current that makes each power cell output in parallel equates, need make each resistance value that exchanges the output copper bar reach balance, therefore make the resistance value of each interchange output copper bar that is arranged with magnet ring be equal to reference impedance value, described reference impedance value exchanges the maximum impedance value of output copper bar when not being arranged with magnet ring greater than described N.That is to say, described reference impedance value is with the difference that exchanges the resistance value of output copper bar when not being arranged with magnet ring the resistance value that increases after sheathed magnet ring on this interchanges output copper bar, exchanges and can determine to be set according to the resistance value that each interchange output copper bar that is not arranged with magnet ring need increase the single turn induction reactance value of exporting the magnet ring on copper bar.Exchange than described N how much the maximum impedance value of output copper bar when not being arranged with magnet ring is large can be determined according to actual conditions voluntarily by those skilled in the art as for reference impedance value.
The present embodiment also provides a kind of inverter that comprises above-mentioned parallel current-equalizing circuit.
Other structures in the present embodiment and effect are all identical with embodiment 1, repeat no more here.
Embodiment 3:
The present embodiment is with the difference of embodiment 2: the quantity of described magnet ring is less than the quantity that exchanges the output copper bar, and namely described parallel current-equalizing circuit comprises N power cell, a N interchange output copper bar and is less than N magnet ring, and N is the positive integer more than or equal to 2; Described N exchanges the maximum impedance value of output copper bar when not being arranged with magnet ring as the reference resistance value, described N exchanges on the interchange output copper bar of output copper bar middle impedance value less than reference impedance value and all is arranged with magnet ring, and the resistance value that is arranged with the interchange output copper bar of magnet ring is equal to described reference impedance value.That is to say, the quantity of required magnet ring is determined by described N resistance value that exchanges the output copper bar, and only have those resistance values less than just needing sheathed magnet ring on the interchange of reference impedance value output copper bar, and exchange the resistance value that increases after sheathed magnet ring on the output copper bar and be reference impedance value and exchange the poor of the resistance value of exporting copper bar with this.
As shown in Figure 2, when N was 2, described parallel current-equalizing circuit comprised that the power cell of two parallel connections, be connected with these two power cells respectively two exchange output copper bar (these two resistance values that exchange output copper bars self are unequal) and be set in one of them and exchanges and export copper bar upper magnetic ring; Described two resistance values that exchange the output copper bar are respectively Z
1And Z
2(can extract the resistance value that exchanges the output copper bar by concrete simulation software) supposes Z
2＞Z
1, the setting reference impedance value is Z
2, it is Z that magnet ring is set in resistance value
1Interchange output copper bar on, and resistance value is Z
1Interchange output copper bar on the resistance value that increases after sheathed this magnet ring be Z
2-Z
1, can determine the single turn induction reactance value of this magnet ring according to the resistance value of this increase.
The present embodiment also provides a kind of inverter that comprises above-mentioned parallel current-equalizing circuit.
Other structures in the present embodiment and effect are all identical with embodiment 2, repeat no more here.
Be understandable that, above execution mode is only the illustrative embodiments that adopts for principle of the present utility model is described, yet the utility model is not limited to this.For those skilled in the art, in the situation that do not break away from spirit of the present utility model and essence, can make various modification and improvement, these modification and improvement also are considered as protection range of the present utility model.
Claims (10)
1. parallel current-equalizing circuit, comprise the power cell of a plurality of parallel connections and a plurality of output copper bars that exchange that are attached thereto respectively, described power cell equates with the quantity that exchanges the output copper bar, form one the tunnel after the parallel connection of described a plurality of interchange output copper bar and exchange output, it is characterized in that, described parallel current-equalizing circuit also comprises a plurality of magnet units, each magnet unit is installed in one and exchanges on the output copper bar, export the resistance value of copper bar to increase this interchange that magnet unit is installed, and make each resistance value that exchanges the output copper bar all equate.
2. parallel current-equalizing circuit according to claim 1, it is characterized in that, the quantity of described magnet unit equates with the quantity that exchanges the output copper bar, and each resistance value that the interchange output copper bar of magnet unit is installed is equal to reference impedance value, and described reference impedance value is greater than the maximum impedance value of described a plurality of interchange output copper bars when magnet unit is not installed.
3. parallel current-equalizing circuit according to claim 1, it is characterized in that, the quantity of described magnet unit is less than the quantity that exchanges the output copper bar, the maximum impedance value of described a plurality of interchange output copper bars when magnet unit is not installed is as the reference resistance value, on the interchange output copper bar of described a plurality of interchange output copper bar middle impedance values less than reference impedance value, magnet unit is installed all, and each resistance value that exchanges the output copper bar that magnet unit is installed is equal to described reference impedance value.
4. the described parallel current-equalizing circuit of any one according to claim 1-3, is characterized in that, described power cell comprises a power model, and perhaps, described power cell comprises a plurality of series connection and/or power model in parallel; Described power model comprises power semiconductor.
5. parallel current-equalizing circuit according to claim 4, is characterized in that, described power semiconductor adopts insulated gate bipolar transistor or mos field effect transistor.
6. the described parallel current-equalizing circuit of any one according to claim 1-3, is characterized in that, described magnet unit is set in and exchanges on the output copper bar, and the endoporus sidewall of described magnet unit does not contact with the outer surface that exchanges the output copper bar.
7. parallel current-equalizing circuit according to claim 6, is characterized in that, is provided with air gap on described magnet unit.
8. parallel current-equalizing circuit according to claim 6, is characterized in that, air gap is not set on described magnet unit.
9. parallel current-equalizing circuit according to claim 6, is characterized in that, the endoporus of described magnet unit is shaped as circle or polygon.
10. an inverter, comprise parallel current-equalizing circuit as claimed in any one of claims 1-9 wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220622264 CN203014662U (en) | 2012-11-22 | 2012-11-22 | Parallel current equalizing circuit and inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220622264 CN203014662U (en) | 2012-11-22 | 2012-11-22 | Parallel current equalizing circuit and inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203014662U true CN203014662U (en) | 2013-06-19 |
Family
ID=48606218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220622264 Expired - Lifetime CN203014662U (en) | 2012-11-22 | 2012-11-22 | Parallel current equalizing circuit and inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203014662U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9685796B2 (en) | 2015-05-18 | 2017-06-20 | Ford Global Technologies, Llc | Current balancing device for parallel battery cells in an electrified vehicle |
| CN108988615A (en) * | 2018-08-19 | 2018-12-11 | 云南卡方机电设备有限公司 | A kind of parallel current-equalizing circuit topological structure |
| CN111786585A (en) * | 2020-05-29 | 2020-10-16 | 华为技术有限公司 | Inverters and Electronic Equipment |
| CN112105138A (en) * | 2020-08-25 | 2020-12-18 | 欣旺达电动汽车电池有限公司 | Electronic component parallel current-sharing circuit, design method and PCB |
-
2012
- 2012-11-22 CN CN 201220622264 patent/CN203014662U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9685796B2 (en) | 2015-05-18 | 2017-06-20 | Ford Global Technologies, Llc | Current balancing device for parallel battery cells in an electrified vehicle |
| CN108988615A (en) * | 2018-08-19 | 2018-12-11 | 云南卡方机电设备有限公司 | A kind of parallel current-equalizing circuit topological structure |
| CN111786585A (en) * | 2020-05-29 | 2020-10-16 | 华为技术有限公司 | Inverters and Electronic Equipment |
| CN111786585B (en) * | 2020-05-29 | 2021-07-09 | 华为技术有限公司 | Inverters and Electronic Equipment |
| CN112105138A (en) * | 2020-08-25 | 2020-12-18 | 欣旺达电动汽车电池有限公司 | Electronic component parallel current-sharing circuit, design method and PCB |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130619 |
|
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: TBEA Xi'an Electric Technology Co.,Ltd. The person in charge Document name: Notice of termination upon expiration of patent right |