CN106300939B - A kind of bus capacitor circuit and vehicle-mounted three-phase motor inverter - Google Patents
A kind of bus capacitor circuit and vehicle-mounted three-phase motor inverter Download PDFInfo
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- CN106300939B CN106300939B CN201510298275.2A CN201510298275A CN106300939B CN 106300939 B CN106300939 B CN 106300939B CN 201510298275 A CN201510298275 A CN 201510298275A CN 106300939 B CN106300939 B CN 106300939B
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- 239000003990 capacitor Substances 0.000 title claims abstract description 130
- 238000011084 recovery Methods 0.000 claims description 6
- 239000010409 thin film Substances 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 5
- 230000005611 electricity Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
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Abstract
The present invention provides a kind of bus capacitor circuit and vehicle-mounted three-phase motor inverter, wherein bus capacitor circuit, comprising: thin-film capacitor, one end connect DC bus anode, and the other end connects DC bus cathode；Electrolytic capacitor, the electrolytic capacitor anode are connected with the cathode of a diode, and the electrolytic capacitor cathode is connected with the DC bus cathode, and the anode of the diode is connected with the DC bus anode；Or the electrolytic capacitor cathode is connected with the anode of a diode, the electrolytic capacitor anode is connected with the DC bus anode, and the cathode of the diode is connected with the DC bus cathode.The present invention substantially reduces the ripple current flowed through in electrolytic capacitor at work；On the other hand, and the ability that electrolytic capacitor absorbs surge current can be played.The present invention realizes that resistance to ripple current ability is strong within the scope of lesser volume weight, while having the effect of powerful surge current absorbability again.
Description
Technical field
The present invention relates to new-energy automobile field more particularly to a kind of bus capacitor circuit and vehicle-mounted three-phase motor inversions
Device.
Background technique
Vehicle-mounted three-phase motor inverter DC terminal generally requires a dc-link capacitance.On the one hand the capacitor can be absorbed
Pulse current caused by switching device switchs, prevent high-frequency pulse current induce due to voltage spikes in the spuious induction reactance of DC terminal and
Damage switching device.The functional requirement dc-link capacitance has larger resistance to ripple current ability.On the other hand, in vehicle-mounted inversion
It, may on DC bus in device transient process, such as durings breaking down protection or inverter output loading mutation etc.
There is biggish surge current.(for example high-tension battery input terminal adapter failure disconnects) in many cases, bus capacitor wants energy
These surge currents are absorbed, prevents DC bus-bar voltage excessively high and damages inverter.The function require bus capacitor have compared with
Big capacity.The frequency of high-frequency pulse current is higher (such as 5kHz or more), and the duration of transient process is about several millis
Second, therefore it is required that the bus capacitor of vehicle-mounted three-phase motor inverter had not only been resistant to the ripple current of high frequency, but also equivalent frequency can be inhaled
Transient current low, energy is big.
In existing common capacity type, thin-film capacitor loss it is low, the resistance to ripple current ability of unit volume is stronger, but capacity compared with
It is small；Electrolytic capacitor capacitance per unit volume amount is big, but height is lost, and resistance to ripple ability is poor.Then met using thin-film capacitor merely
When capacity requirement, resistance to ripple current ability is excessively raw；When using electrolytic capacitor merely, then when meeting capacity requirement, resistance to ripple electricity
Flow scarce capacity.
Summary of the invention
Technical problem to be solved by the present invention lies in provide one kind within the scope of lesser volume weight, resistance to ripple electricity
Stream ability is strong, and the bus capacitor circuit and vehicle-mounted three-phase motor inverter that surge current absorbability is strong.
In order to solve the above technical problem, the present invention provides a kind of bus capacitor circuits, are used for vehicle-mounted three-phase motor inversion
Device, comprising:
Thin-film capacitor, one end connect DC bus anode, and the other end connects DC bus cathode；
Electrolytic capacitor, anode are connected with the cathode of a diode, and cathode is connected with the DC bus cathode；Or
Its cathode is connected with the anode of a diode, and anode is connected with the DC bus anode.
Wherein, further includes:
Bleeder resistance is connected in parallel on the electrolytic capacitor both ends, for slowly discharging to the electrolytic capacitor.
Wherein, the resistance value size satisfaction of the bleeder resistance can be one after electricity under the vehicle-mounted three-phase motor inverter
It fixes time the energy of the interior release electrolytic capacitor and the thin-film capacitor, and after the electrolytic capacitor absorbs a surge
Can be released wherein extra charge within a certain period of time.
Wherein, the diode is fast recovery diode.
The present invention also provides a kind of vehicle-mounted three-phase motor inverters, comprising:
Bus capacitor circuit and the three phase inverter bridge being connected in turn between DC bus positive electrode and negative electrode；
The bus capacitor circuit includes:
Thin-film capacitor, one end connect the DC bus anode, and the other end connects the DC bus cathode；
Electrolytic capacitor, anode are connected with the cathode of a diode, and cathode is connected with the DC bus cathode；Or
Its cathode is connected with the anode of a diode, and anode is connected with the DC bus anode.
Wherein, further includes:
Bleeder resistance is connected in parallel on the electrolytic capacitor both ends, for slowly discharging to the electrolytic capacitor.
Wherein, the resistance value size satisfaction of the bleeder resistance can be one after electricity under the vehicle-mounted three-phase motor inverter
It fixes time the energy of the interior release electrolytic capacitor and the thin-film capacitor, and after the electrolytic capacitor absorbs a surge
Can be released wherein extra charge within a certain period of time.
Wherein, the diode is fast recovery diode.
The present invention substantially reduces the ripple current flowed through in electrolytic capacitor at work；On the other hand, and electricity can be played
Solve the ability of capacitive absorption surge current.For the present invention within the scope of lesser volume weight, it is strong to realize resistance to ripple current ability,
Has the effect of powerful surge current absorbability again simultaneously.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of one bus capacitor circuit of the embodiment of the present invention.
Fig. 2 is another structural schematic diagram of one bus capacitor circuit of the embodiment of the present invention.
Fig. 3 is the schematic equivalent circuit of one bus capacitor circuit of the embodiment of the present invention.
Fig. 4 is the waveform diagram that one bus capacitor circuit of the embodiment of the present invention flows into ripple current.
Fig. 5 is the waveform diagram that one bus capacitor circuit of the embodiment of the present invention flows into surge current.
Specific embodiment
The explanation of following embodiment be with reference to attached drawing, can be to the specific embodiment implemented to the example present invention.
It please refers to shown in Fig. 1 and Fig. 2, the embodiment of the present invention one provides a kind of bus capacitor circuit, is used for vehicle-mounted three-phase electricity
Machine inverter, comprising:
Thin-film capacitor Cf, one end connect DC bus anode, and the other end connects DC bus cathode；
Electrolytic capacitor Cp, anode are connected with the cathode of a diode D1, and cathode is connected with DC bus cathode, two poles
The anode of pipe D1 is connected (as shown in Figure 1) with DC bus anode；Or its cathode is connected with the anode of a diode D1, just
Pole is connected with DC bus anode, and the cathode of diode D1 is connected (as shown in Figure 2) with DC bus cathode.
Diode D1 can be general-purpose diode, use fast recovery diode in the present embodiment.
From the foregoing, it will be observed that the bus capacitor circuit of the embodiment of the present invention is actually to replace with existing bus capacitor by one
The combination capacitor of a thin-film capacitor and an electrolytic capacitor (being in series with a diode) formation in parallel avoids simple using one
When kind capacitor, due to resistance to ripple ability or the shortcoming of amount of capacity, and lead to both sides requirement in order to balance, it has to increase
Capacitor quantity (or size), and the problem for causing capacitor volume excessive.
The present embodiment is the both ends electrolytic capacitor Cp also one bleeder resistance R1 of parallel connection, specifically, as shown in Figure 1, bleeder resistance
One end of R1 is connected with the anode of electrolytic capacitor Cp, and the other end is connected with DC bus cathode；Or as shown in Fig. 2, vent discharge
One end of resistance R1 is connected with the cathode of electrolytic capacitor Cp, and the other end is connected with DC bus anode.Bleeder resistance R1 has larger
Resistance value, resistance value size satisfaction (such as 120 seconds) can be released within a certain period of time after electricity under vehicle-mounted three-phase motor inverter
The energy of electrolytic capacitor Cp and thin-film capacitor Cf are put, and can be within a certain period of time after electrolytic capacitor Cp absorbs a surge
(such as 120 seconds) release wherein extra charge.
Illustrate the bus capacitor circuit course of work of the embodiment of the present invention below with reference to Fig. 3, simultaneously with the both ends electrolytic capacitor Cp
It is associated with for bleeder resistance R1.
Since the resistance value of bleeder resistance R1 is very big, the RC time constant of it and electrolytic capacitor Cp composition is very big by (such as 100
Second), it can ignore much larger than the analysis time of ripple current and surge current, therefore when analyzing ripple current and surge current
This resistance.I in Fig. 3inIt is input current, Vf is thin-film capacitor Cf both end voltage, and Vp is electrolytic capacitor Cp both end voltage.
Referring to shown in Fig. 4, when being subjected to ripple current:
I at this timeinFor ripple current, waveform is substantially positive and negative alternate alternating current, and square wave shown in Fig. 4 is only to show
Meaning.Under the action of ripple current, the ripple voltage of fluctuation can be generated on thin-film capacitor Cf, in the waveform such as Fig. 4 under stable state
Dotted line Vf,sIt is shown.
T0 moment, inverter do not work, ripple current zero, Vp=Vf.
T1 moment, inverter are started to work, it is assumed that and ripple current is negative at this time, then Vf declines under ripple current effect,
But due to the effect of diode D1, electrolytic capacitor Cp can not discharge, and then its voltage Vp remains unchanged.
T2 moment, Vf reach equal with Vp in uphill process, and hereafter Vf > Vp, electrolytic capacitor Cp continue to charge, and Vp increases
Greatly.
At the t3 moment, Vf is again during decline and Vp is equal, and hereafter Vp is remained unchanged.
At the t4 moment, Vf is again equal with Vp in uphill process, and hereafter electrolytic capacitor Cp continues to charge, and Vp increases.
At the t5 moment, Vf is again during decline and Vp is equal, and hereafter Vp is remained unchanged.
It loops back and forth like this, until Vp basically reaches the maximum of Vf, line after (such as since the t6 moment) a period of time
Wave electric current almost no longer gives electrolytic capacitor Cp to charge, and electrolytic capacitor Cp itself does not discharge, therefore almost no longer has ripple electric
Stream is flowed through from electrolytic capacitor Cp, and almost all of ripple current is all flowed through from thin-film capacitor Cf, to play thin-film electro
The resistance to ripple ability for holding Cf, has evaded the disadvantage of the resistance to ripple ability difference of electrolytic capacitor Cp.
It is shown referring to figure 5. again, it is assumed that surge current occurs at the t0 moment, and t0 moment electrolytic capacitor Cp is than thin-film capacitor Cf
Voltage is big.
T0 moment, Vf < Vp, therefore diode D1 are turned off, and all surge currents flow into thin-film capacitor Cf, on Vf is rapid
It rises, Vp is remained unchanged.
T1 moment, i.e. Vf=Vp identical as Vp after Vf increases, diode D1 conducting, surge current flow into electrolytic capacitor simultaneously
Cp and thin-film capacitor Cf, since electrolytic capacitor Cp capacity is greater than thin-film capacitor Cf, most surge current flows into electrolysis
Capacitor Cf.
T2 moment, surge current fall to zero, and surge process terminates.
If the voltage at the both ends electrolytic capacitor Cp has reached DC bus-bar voltage size when surge current occurs,
Surge absoption process is directly since the t1 moment.
Since electrolytic capacitor Cp capacity is big, surge current is largely absorbed by electrolytic capacitor Cp, to play electricity
Solve the big advantage of capacitor Cp capacity.
By above description it is found that the present invention at work, substantially reduces the ripple current flowed through in electrolytic capacitor Cp.
On the other hand, and the ability that electrolytic capacitor Cp absorbs surge current can be played when surge current occurs.Bus electricity of the invention
It is strong to realize resistance to ripple current ability within the scope of lesser volume weight for capacitive circuit, while having powerful surge current again
The effect of absorbability.
Corresponding to the bus capacitor circuit of the embodiment of the present invention one, as shown in Figure 1, the embodiment of the present invention two also provides one kind
Vehicle-mounted three-phase motor inverter, comprising:
Bus capacitor circuit and the three phase inverter bridge being connected in turn between DC bus positive electrode and negative electrode；
The bus capacitor circuit includes:
Thin-film capacitor Cf, one end connect the DC bus anode, and the other end connects the DC bus cathode；
Electrolytic capacitor Cp, anode are connected with the cathode of a diode D1, and cathode is connected with DC bus cathode, two poles
The anode of pipe D1 is connected (as shown in Figure 1) with DC bus anode；Or its cathode is connected with the anode of a diode D1, just
Pole is connected with DC bus anode, and the cathode of diode D1 is connected (as shown in Figure 2) with DC bus cathode.
Diode D1 can be general-purpose diode, use fast recovery diode in the present embodiment.
The present embodiment is similarly electrolytic capacitor Cp one bleeder resistance R1 of parallel connection, specifically, as shown in Figure 1, bleeder resistance R1
One end be connected with the anode of electrolytic capacitor Cp, the other end is connected with DC bus cathode；Or as shown in Fig. 2, bleeder resistance
One end of R1 is connected with the cathode of electrolytic capacitor Cp, and the other end is connected with DC bus anode.Bleeder resistance R1 has biggish
Resistance value, resistance value size meets (such as 120 seconds) can discharge after electricity within a certain period of time under vehicle-mounted three-phase motor inverter
The energy of electrolytic capacitor Cp and thin-film capacitor Cf, and can (example within a certain period of time after electrolytic capacitor Cp absorbs a surge
Such as 120 seconds) wherein extra charge of releasing.
By in this present embodiment, the structure & working mechanism of bus capacitor circuit is identical as the embodiment of the present invention one, therefore
The three-phase motor inverter of the present embodiment similarly has the beneficial effect as brought by bus capacitor circuit, no longer superfluous herein
It states.
In conclusion the present invention can realize that a resistance to ripple current ability is strong, together within the scope of lesser volume weight
When there is the inverter and its bus capacitor circuit of powerful surge current absorbability again, be particularly suitable for vehicle-mounted three-phase motor
The application of this kind of high request.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, therefore equivalent changes made in accordance with the claims of the present invention, is still within the scope of the present invention.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510298275.2A CN106300939B (en) | 2015-06-03 | 2015-06-03 | A kind of bus capacitor circuit and vehicle-mounted three-phase motor inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510298275.2A CN106300939B (en) | 2015-06-03 | 2015-06-03 | A kind of bus capacitor circuit and vehicle-mounted three-phase motor inverter |
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| Publication Number | Publication Date |
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| CN106300939A CN106300939A (en) | 2017-01-04 |
| CN106300939B true CN106300939B (en) | 2019-04-02 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5825639A (en) * | 1997-10-16 | 1998-10-20 | Magnetek, Inc. | DC bus capacitor arrangement |
| JP2001197733A (en) * | 2000-01-11 | 2001-07-19 | Nissin Electric Co Ltd | Dc/dc converter |
| CN102761269A (en) * | 2012-06-30 | 2012-10-31 | 华为技术有限公司 | Power unit and frequency converter |
| CN103427616A (en) * | 2013-08-28 | 2013-12-04 | 苏州汇川技术有限公司 | Large-size frequency converter and electrifying buffer circuit on control power supply of large-size frequency converter |
| CN204231188U (en) * | 2014-08-26 | 2015-03-25 | 广东美的制冷设备有限公司 | Power conversion circuit and transducer air conditioning |
| CN204761282U (en) * | 2015-06-03 | 2015-11-11 | 广州汽车集团股份有限公司 | BUS capacitors circuit and on -vehicle three phase machine dc -to -ac converter |
-
2015
- 2015-06-03 CN CN201510298275.2A patent/CN106300939B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5825639A (en) * | 1997-10-16 | 1998-10-20 | Magnetek, Inc. | DC bus capacitor arrangement |
| JP2001197733A (en) * | 2000-01-11 | 2001-07-19 | Nissin Electric Co Ltd | Dc/dc converter |
| CN102761269A (en) * | 2012-06-30 | 2012-10-31 | 华为技术有限公司 | Power unit and frequency converter |
| CN103427616A (en) * | 2013-08-28 | 2013-12-04 | 苏州汇川技术有限公司 | Large-size frequency converter and electrifying buffer circuit on control power supply of large-size frequency converter |
| CN204231188U (en) * | 2014-08-26 | 2015-03-25 | 广东美的制冷设备有限公司 | Power conversion circuit and transducer air conditioning |
| CN204761282U (en) * | 2015-06-03 | 2015-11-11 | 广州汽车集团股份有限公司 | BUS capacitors circuit and on -vehicle three phase machine dc -to -ac converter |
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| Publication number | Publication date |
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| CN106300939A (en) | 2017-01-04 |
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Effective date of registration: 20220104 Address after: 511434 No. 36, Longying Road, Shilou Town, Panyu District, Guangzhou City, Guangdong Province Patentee after: GAC AION New Energy Vehicle Co.,Ltd. Address before: 510000 23 building, Cheng Yue mansion 448-458, Dongfeng Middle Road, Yuexiu District, Guangzhou, Guangdong. Patentee before: GUANGZHOU AUTOMOBILE GROUP Co.,Ltd. |
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Address after: No. 36 Longying Road, Shilou Town, Panyu District, Guangzhou City, Guangdong Province Patentee after: GAC AION NEW ENERGY AUTOMOBILE Co.,Ltd. Country or region after: China Address before: No. 36 Longying Road, Shilou Town, Panyu District, Guangzhou City, Guangdong Province Patentee before: GAC AION New Energy Vehicle Co.,Ltd. Country or region before: China |
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