CN106374809A - Power device parallel current sharing device of power converter of switched reluctance motor - Google Patents
Power device parallel current sharing device of power converter of switched reluctance motor Download PDFInfo
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- CN106374809A CN106374809A CN201610970399.5A CN201610970399A CN106374809A CN 106374809 A CN106374809 A CN 106374809A CN 201610970399 A CN201610970399 A CN 201610970399A CN 106374809 A CN106374809 A CN 106374809A
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Abstract
A power device parallel current sharing device of a power converter of a switched reluctance motor comprises a hardware current sharing module and a software current sharing control module, wherein the hardware current sharing module comprises a driver and power devices, a resistor Rg is connected between a positive electrode of the driver and a grid of each power device, a drain of the power device is connected with a lead inductor Ld, a source of the power device is connected with a lead inductor Ls, a device conduction resistor RDS (on) is connected in series between a source inductor Ls of the power device and a negative electrode of the driver, the power devices are connected in parallel, the software current sharing control module is an optimization module proposed based on chopping control, and chopping modes are used in turn by controlling and adjusting the controller. In the power device parallel current sharing device, current sharing of the software aspect and current sharing of the hardware aspect are matched, the current sharing effect is good and obvious, power device parallel current sharing device is small in switch loss and low in cost, and the current sharing of the parallel device is ensured from two aspects of hardware and software.
Description
Technical field
The invention belongs to motor power (output) changer field is and in particular to a kind of Power Converter for Switched Reluctance Motor work(
Rate device parallel current-sharing device.
Background technology
Switched reluctance machines have that structure is simple, speed-regulating range width, the advantage of no rare earth, low cost, are advocating new forms of energy
Main trend under have vast potential for future development.So far, in, powerful power converter of switch reluctance motor typically selects
With igbt as main switching device.Price however as the raising igbt of power level is also more and more expensive, and this makes to switch
The advantage of reluctance motor low cost is weakened.
Replace original igbt with the slightly smaller power device parallel connection of power level, both ensure that switching speed and proof voltage,
Current class also reduces cost simultaneously.But using power device parallel connection go to construct new power inverter exist many tired
Difficulty, it is noted that some solutions of power device parallel current-sharing in conventional document, is but not bound with switched reluctance machines
Application example be analyzed.Also have and mention the power inverter that switched reluctance machines are constituted with power device, rare use
Power device is in parallel simultaneously makes the research of corresponding all stream, and document analysis cause the major parameter of uneven stream, but just for
One of or several parameters, to analyze, with reference to specifically topology, the untoward reaction that uneven stream causes.Most of documents
Analysis for parallel current-sharing concentrates on hardware view, lays particular emphasis on analysis and the optimization of device parameters, without from software control
Aspect is corrected to uneven flow phenomenon.
Content of the invention
It is an object of the invention to provide a kind of Power Converter for Switched Reluctance Motor power device parallel current-sharing device, should
Device replaces original igbt with the slightly smaller power device parallel connection of power level, is ensureing power converter of switch reluctance motor
Further reduces cost on the basis of performance, and little excellent of switching loss can be had with the electric current of efficient balance devices in parallel
Gesture.
The present invention provides a kind of following technical scheme: Power Converter for Switched Reluctance Motor power device parallel current-sharing dress
Put, including hardware current-sharing module and software current sharing control module, described hardware current-sharing module includes driver and power device, institute
State series resistance r between the positive pole of driver and the grid of described power deviceg, the drain electrode access lead electricity of described power device
Sense ld, source electrode access lead-in inductance l of described power devices, source inductance l of described power devicesWith bearing of described driver
Tandem devices conducting resistance r between poleds(on), in parallel between described power device.Described software current sharing control module is to be based on to cut
Ripple controls the optimization module proposing, and controls to adjust driver, using the mode of copped wave in turn, chopping frequency is uniformly dispersed in
Upper and lower bridge arm, makes each power device equalization of incidence, also reduces switching loss simultaneously.
Preferably, described driver and described power device gate series resistance rgTo select same resistance, same batch
Resistance, grid lead specification is consistent, length is identical, it is to avoid the uneven stream that resistance causes.
Preferably, described conducting resistance rds(on)Same model, the product with batch will strictly be selected when power parallel uses
Product, conducting resistance rds(on)The main steady-state current affecting switching tube, the difference of milliohm level also can cause significantly uneven stream existing
As.
Preferably, described power device drain electrode inductance ldLead, to strictly select length, diameter to be consistent, drain electrode
Lead-in inductance ldCurrent oscillation degree when main impact device is opened, if the grid lead inductance appearance of devices in parallel is inconsistent,
Then the initial stage nonsynchronous concussion of appearance can be set up in conducting electric current.
Preferably, described power device and source inductance lsBetween lead, strictly select source lead size and
Material and being consistent, different source lead can produce significantly asynchronous concussion in electric current establishment stage, is closing faulted-stage
Section also can affect the speed of device shutoff, makes shutoff asynchronous.
The new beneficial effect of this experiment is: using original based on the replacement in parallel of the less power device of power level
Igbt as parallel current-sharing device, reduces cost further on the basis of ensureing power converter of switch reluctance motor performance,
And controlled using software and optimize the electric current that can effectively equalize devices in parallel, there is the little advantage of switching loss.
Brief description
Accompanying drawing is used for providing a further understanding of the present invention, and constitutes a part for description, the reality with the present invention
Apply example and be used for explaining the present invention together, be not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the artificial circuit of the present invention；
Fig. 3 is the software control sequential figure of the present invention.
Specific embodiment
A kind of Power Converter for Switched Reluctance Motor power device parallel current-sharing device includes hardware and all flows as shown in Figure 1
Module and software current sharing control module, described hardware current-sharing module includes driver and power device, the positive pole of described driver
Series resistance r and the grid of described power device betweeng, gate series resistance rgAdjust ensure that devices in parallel opening and
Off-phases are not hit the impact of electric current.Keep resistance rgUnanimously ensure that open stage power device can be synchronous
Set up electric current.The drain electrode of described power device accesses lead-in inductance ldThe source electrode of described power device accesses lead-in inductance ls, described
Source inductance l of power devicesTandem devices conducting resistance r and the negative pole of described driver betweends(on), described power device
Between in parallel.Described software current sharing control module is the optimization module being proposed based on chop control, controls to adjust driver, uses
The mode of copped wave, chopping frequency is uniformly dispersed in upper and lower bridge arm in turn, makes each power device equalization of incidence, also reduces simultaneously
Switching loss.
It is the artificial circuit of the present invention as shown in Figure 2, described power device adopts the less mosfet of power level, described
Series resistance r between the positive pole of driver and the grid of mosfetg, drain electrode access lead-in inductance l of mosfetd, the source of mosfet
Lead-in inductance l is accessed in poles, source inductance l of mosfetsTandem devices conducting resistance and the negative pole of described driver between
rds(on), in parallel between mosfet.Emulation experiment is carried out by artificial circuit as shown in Figure 2 to the present invention, the following result of discovery:
1st, resistance rgBe related to power device opens turn-off speed, if difference in resistance, then can make parallel power
Break-over of device is inconsistent, produces uneven stream.If so can not be accurately to gate series rgThe measurement of impedance, in practical application
In should ensure that grid lead specification is consistent, length is identical, and will be from same resistance, with a batch of resistance.2nd, drain electrode is drawn
Line inductance ldThe interval producing impact is set up the initial stage in electric current, bigger drain lead inductance ldCurrent fluctuation can be made to tend to flat
It is slow,.But drain lead inductance ldAnd ghost effect about is uncontrollable factor, so should be rectified in hardware circuit
Just.Rough inductance value can be calculated by empirical equation, if not can accurately measure in practical application, then needs strict guarantee
The drain lead length of each devices in parallel, diameter, material are consistent.3rd, source lead inductance lsNot only produce in electric current establishment stage
Raw impact, also different in the electric current downward trend of device off-phases difference source lead inductance.So should artificially carry out
Control so as to homogeneous balance.With drain lead inductance lsIdentical, rough inductance value can be calculated by empirical equation, real
If not can accurately measure in the application of border, then need the drain lead length of each devices in parallel of strict guarantee, diameter, material phase one
Cause.4th, device on-resistance rds(on)It is by the parameter being determined inside power device it is impossible to carry out artificial correction from outside.
By emulating and testing, this parameter is the main cause causing devices in parallel current-unbalance.Different conducting resistance,
Just show obvious electric current difference at the circuit debugging initial stage, and difference can increase with the rising of running voltage, and then
Jeopardize whole Circuits System.So in actual applications will strictly using same brand, same model, with batch device.
In traditional switched Reluctance Motor Control mode, or realized by some in the upper and lower brachium pontis of switch
Copped wave, or simultaneously turn off the switching device of upper and lower bridge arm and realize copped wave.
Table 1
Experiments verify that, effect in terms of current balance for both control modes is all less desirable, effect such as table 1.
The present invention, using the mode of copped wave in turn, chopping frequency is uniformly dispersed in upper and lower bridge arm, makes each power device
Equalization of incidence, also reduces switching loss simultaneously.The software control sequential figure of the present invention as shown in Figure 3, the mode of copped wave in turn
I.e. brachium pontis switching device on first switch periods turns off, brachium pontis switching device under second switch periods turns off.So
Control mode allow for being uniformly distributed switching frequency, make each brachium pontis of each phase be operated in close shape
State.All stream of software view and hardware view all stream match all flow respond well.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to aforementioned reality
Apply example the present invention has been described in detail, for a person skilled in the art, it still can be to aforementioned each enforcement
Technical scheme described in example is modified, or carries out equivalent to wherein some technical characteristics.All essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement made etc., should be included within the scope of the present invention.
Claims (6)
1. a kind of Power Converter for Switched Reluctance Motor power device parallel current-sharing device, including hardware current-sharing module and software
Current sharing control module is it is characterised in that described hardware current-sharing module includes driver and power device, the positive pole of described driver
Series resistance r and the grid of described power device betweeng, drain electrode access lead-in inductance l of described power deviced, described power device
The source electrode of part accesses lead-in inductance ls, source inductance l of described power devicesThe Tandem devices and negative pole of described driver between
Conducting resistance rds(on), in parallel between described power device；Described software current sharing control module is controlled by adjustment driver.
2. a kind of Power Converter for Switched Reluctance Motor power device parallel current-sharing device according to claim 1, its
It is characterised by, described driver and described power device gate series resistance rgWill from same resistance, with a batch of resistance,
The grid lead specification of described power device is consistent, length is identical.
3. a kind of Power Converter for Switched Reluctance Motor power device parallel current-sharing device according to claim 1, its
It is characterised by, the drain electrode of described power device and described lead-in inductance ldBetween wire length, diameter consistent.
4. a kind of Power Converter for Switched Reluctance Motor power device parallel current-sharing device according to claim 1, its
It is characterised by, the source electrode of described power device and described lead-in inductance lsBetween lead size and material consistent.
5. a kind of Power Converter for Switched Reluctance Motor power device parallel current-sharing device according to claim 1, its
It is characterised by, described device on-resistance rds(on)Same resistance, same batch will be selected when described power device is used in parallel
Resistance.
6. a kind of Power Converter for Switched Reluctance Motor power device according to any one of claim 1 arrives right 5
Parallel current-sharing device is it is characterised in that described software current sharing control module adopts the controller of upper and lower bridge arm copped wave in turn.
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| CN201610970399.5A CN106374809A (en) | 2016-11-04 | 2016-11-04 | Power device parallel current sharing device of power converter of switched reluctance motor |
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| CN201610970399.5A CN106374809A (en) | 2016-11-04 | 2016-11-04 | Power device parallel current sharing device of power converter of switched reluctance motor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712639A (en) * | 2017-02-16 | 2017-05-24 | 上海理工大学 | Electric driving device and electric equipment |
| CN113767563A (en) * | 2019-01-10 | 2021-12-07 | 沃孚半导体公司 | High power multilayer module with low inductance and fast switching for parallel power devices |
| US11445630B2 (en) | 2017-01-13 | 2022-09-13 | Wolfspeed, Inc. | High power multilayer module having low inductance and fast switching for paralleling power devices |
| US11696417B2 (en) | 2017-01-13 | 2023-07-04 | Wolfspeed, Inc. | High power multilayer module having low inductance and fast switching for paralleling power devices |
| US12010823B2 (en) | 2017-01-13 | 2024-06-11 | Wolfspeed, Inc. | High power multilayer module having low inductance and fast switching for paralleling power devices |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11445630B2 (en) | 2017-01-13 | 2022-09-13 | Wolfspeed, Inc. | High power multilayer module having low inductance and fast switching for paralleling power devices |
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| US12010823B2 (en) | 2017-01-13 | 2024-06-11 | Wolfspeed, Inc. | High power multilayer module having low inductance and fast switching for paralleling power devices |
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| CN113767563A (en) * | 2019-01-10 | 2021-12-07 | 沃孚半导体公司 | High power multilayer module with low inductance and fast switching for parallel power devices |
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Application publication date: 20170201 |