CN106301046B - A kind of multi-electrical level inverter and its flying capacitor pre-charge circuit - Google Patents
A kind of multi-electrical level inverter and its flying capacitor pre-charge circuit Download PDFInfo
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- CN106301046B CN106301046B CN201610737544.5A CN201610737544A CN106301046B CN 106301046 B CN106301046 B CN 106301046B CN 201610737544 A CN201610737544 A CN 201610737544A CN 106301046 B CN106301046 B CN 106301046B
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- flying capacitor
- level inverter
- electrical level
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- current limliting
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
This application discloses a kind of multi-electrical level inverter and its flying capacitor pre-charge circuit, the circuit includes: current limliting module and control unit；Wherein, the current limliting module one terminates the bridge arm output end of the multi-electrical level inverter, another negative DC bus of termination；Described control unit, for controlling the on-off of switching tube in the multi-electrical level inverter, it include the current limliting module in the flying capacitor preliminary filling electrical circuit so as to form flying capacitor preliminary filling electrical circuit between the intermediate node and negative DC bus of two bus capacitors of arbitrary neighborhood.The application is avoided when being pre-charged to flying capacitor, the problem of switching tube is damaged because bearing entire DC bus-bar voltage stress occurs.
Description
Technical field
The present invention relates to power electronics fields, more specifically to a kind of multi-electrical level inverter and its electricity that suspends
Hold pre-charge circuit.
Background technique
Multi-electrical level inverter before activation, needs to be pre-charged internal flying capacitor, conventional technology is
Connect between positive direct-current bus and the anode of flying capacitor one switch and current-limiting resistance, then by control it is described switch and it is more
The on-off of switching tube in electrical level inverter, be pre-charged back formation flying capacitor between positive direct-current bus and DC bus midpoint
Road, but this often will cause respective switch pipe in multi-electrical level inverter and damages because bearing entire DC bus-bar voltage stress.It lifts
Example explanation:
Fig. 1 a shows a kind of single-phase topology of typical five-electrical level inverter, by switching tube S1~S8, positive bus-bar electricity
The elements such as appearance C1, negative busbar capacitor C2 and flying capacitor Cf are built-up, and each interelement connection relationship is as follows: each self-supporting of C1 and C2
By the half of DC bus-bar voltage；Positive direct-current bus bus+ connects the collector of S1；Negative DC bus bus- connects the emitter of S6；Directly
Stream bus midpoint N connects the emitter of S2 and the emitter of S4 respectively；The collector of S2 connects the collector of S3；The collector of S4 meets S5
Collector；The emitter of S3 connects the anode of the emitter of S1, the collector of S7 and flying capacitor Cf respectively；The emitter of S5 point
The cathode of the collector of S6, the emitter of S8 and flying capacitor Cf is not connect；The emitter of S7 and the collector of S8 are defeated as bridge arm
Outlet P.
In order to be pre-charged to flying capacitor Cf, connect between positive direct-current bus bus+ and the anode of flying capacitor Cf
Switch K1 and current-limiting resistance R1；After switch K1 and S4 are opened, charging current from positive direct-current bus bus+ flow out, through switch K1,
Current-limiting resistance R1, flying capacitor Cf, S5 internal diode, S4 flow back to DC bus midpoint N, form flying capacitor and be pre-charged back
Road, as shown in dotted line with the arrow in Fig. 1 b, arrow direction represents current direction.But moment is opened in switch K1, due to suspending
Voltage on capacitor Cf is zero, therefore the collector of S6 and positive direct-current bus bus+ equipotential, and S6 will bear entire direct current at this time
Busbar voltage stress is very easy to damage.
Summary of the invention
In view of this, the present invention provides a kind of multi-electrical level inverter and its flying capacitor pre-charge circuit, to avoid right
When flying capacitor is pre-charged, there is the problem of switching tube is damaged because bearing entire DC bus-bar voltage stress.
A kind of flying capacitor pre-charge circuit of multi-electrical level inverter, comprising: current limliting module and control unit；
Wherein, the current limliting module one terminates the bridge arm output end of the multi-electrical level inverter, and another negative direct current of termination is female
Line；
Described control unit, for controlling the on-off of switching tube in the multi-electrical level inverter, so that arbitrary neighborhood two
Flying capacitor preliminary filling electrical circuit is formed between the intermediate node of bus capacitor and negative DC bus, the flying capacitor is pre-charged back
It include the current limliting module in road.
A kind of flying capacitor pre-charge circuit of multi-electrical level inverter, comprising: current limliting module and control unit；
Wherein, the current limliting module one terminates the bridge arm output end of the multi-electrical level inverter, and another termination positive direct-current is female
Line；
Described control unit, for controlling the on-off of switching tube in the multi-electrical level inverter, so that arbitrary neighborhood two
Flying capacitor preliminary filling electrical circuit is formed between the intermediate node and positive direct-current bus of bus capacitor, the flying capacitor is pre-charged back
It include the current limliting module in road.
Wherein, the current limiting element in the current limliting module includes one in equivalent resistance, equivalent inductance or equivalent capacity
Or any several combination.
Wherein, the current limliting module one terminates the bridge arm output end of the multi-electrical level inverter, comprising:
Current limliting module one end connects its bridge arm output end through the output filter of the multi-electrical level inverter, alternatively, institute
State the bridge arm output end that current limliting module one end is connected directly to the multi-electrical level inverter.
Optionally, the flying capacitor pre-charge circuit further includes controllable switch；
The controllable switch is connected in series with all or part of current limiting element in the current limliting module；
Described control unit connects the control terminal of the controllable switch.
Wherein, the controllable switch is relay, MOSFET or IGBT.
A kind of multi-electrical level inverter, including any flying capacitor pre-charge circuit disclosed above.
Optionally, when the flying capacitor pre-charge circuit in more level three-phase inverters further includes controllable switch,
The three-phase bridge arm of more level three-phase inverters shares a controllable switch.
A kind of flying capacitor pre-charge method of multi-electrical level inverter, the flying capacitor preliminary filling applied to multi-electrical level inverter
Circuit, the flying capacitor pre-charge circuit have the bridge arm output end of a termination multi-electrical level inverter, another termination just
The current limliting module of DC bus, which comprises
When receiving charging instruction, the on-off of switching tube in the multi-electrical level inverter is controlled, so that arbitrary neighborhood two
Flying capacitor preliminary filling electrical circuit, the flying capacitor precharge are formed between the intermediate node of a bus capacitor and negative DC bus
It include the current limliting module in circuit；
When the flying capacitor be pre-charged complete when, then in multi-electrical level inverter described in secondary control switching tube on-off, make
The flying capacitor preliminary filling electrical circuit is obtained to disconnect.
A kind of flying capacitor pre-charge method of multi-electrical level inverter, the flying capacitor preliminary filling applied to multi-electrical level inverter
Circuit, the flying capacitor pre-charge circuit have the bridge arm output end of a termination multi-electrical level inverter, another termination negative
The current limliting module of DC bus, which comprises
When receiving charging instruction, the on-off of switching tube in the multi-electrical level inverter is controlled, so that arbitrary neighborhood two
Flying capacitor preliminary filling electrical circuit, the flying capacitor precharge are formed between the intermediate node and positive direct-current bus of a bus capacitor
It include the current limliting module in circuit；
When the flying capacitor be pre-charged complete when, then in multi-electrical level inverter described in secondary control switching tube on-off, make
The flying capacitor preliminary filling electrical circuit is obtained to disconnect.
It can be seen from the above technical scheme that bridge arm output end and negative DC bus of the present invention in multi-electrical level inverter
Current limliting module is connected between bus-, then is controlled by the on-off to switching tube in multi-electrical level inverter to make arbitrary neighborhood two
The flying capacitor precharge for flowing through the current limliting module is formed between the intermediate node of a bus capacitor and negative DC bus bus-
Circuit.Compared to the prior art, the flying capacitor pre-charge circuit that the present invention designs is in powered on moment, it is ensured that multi-level inverse conversion
The maximum voltage stress that switching tube in device is subjected to is lower than DC bus-bar voltage, this would not be caused in multi-electrical level inverter
Switching tube is damaged because bearing entire DC bus-bar voltage stress.
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 a is a kind of single-phase topological structure schematic diagram of five-electrical level inverter disclosed in the prior art；
Fig. 1 b is a kind of flying capacitor pre-charge circuit structural schematic diagram of five-electrical level inverter disclosed in the prior art；
Fig. 1 c is a kind of single-phase topological structure schematic diagram of multi-electrical level inverter disclosed in the prior art；
Fig. 1 d is the single-phase topological structure schematic diagram of four electrical level inverter of one kind disclosed in the prior art；
Fig. 2 a is the single-phase topological structure schematic diagram of seven electrical level inverter of one kind disclosed in the prior art；
Fig. 2 b is a kind of flying capacitor pre-charge circuit structural representation of multi-electrical level inverter disclosed by the embodiments of the present invention
Figure；
Fig. 2 c is a kind of flying capacitor pre-charge circuit structural representation of five-electrical level inverter disclosed by the embodiments of the present invention
Figure；
Fig. 3 is a kind of flying capacitor pre-charge circuit as shown in Figure 2 c and output filter disclosed by the embodiments of the present invention
Positional diagram；
Fig. 4 is another flying capacitor pre-charge circuit and output filter as shown in Figure 2 c disclosed by the embodiments of the present invention
Positional diagram；
Fig. 5 is the flying capacitor pre-charge circuit structural representation of another five-electrical level inverter disclosed by the embodiments of the present invention
Figure；
Fig. 6 is the flying capacitor pre-charge circuit structural representation of another five-electrical level inverter disclosed by the embodiments of the present invention
Figure；
Fig. 7 is the flying capacitor pre-charge circuit structural representation of another multi-electrical level inverter disclosed by the embodiments of the present invention
Figure；
Fig. 8 is a kind of more level three-phase inverter structural schematic diagrams disclosed by the embodiments of the present invention；
Fig. 9 is a kind of flying capacitor pre-charge method flow chart of multi-electrical level inverter disclosed by the embodiments of the present invention；
Figure 10 is the flying capacitor pre-charge method flow chart of another multi-electrical level inverter disclosed by the embodiments of the present invention.
Specific embodiment
The equivalent circuit of the single-phase topology of multi-electrical level inverter as illustrated in figure 1 c, including bus capacitor unit, switching tube list
Member, flying capacitor unit, each interelement connection relationship are as follows: the bus capacitor unit connects on DC bus, has multiple
The bus capacitor being connected in series；The flying capacitor unit connects the outlet side in multi-electrical level inverter, identical by several structures
Subelement cascades, each subelement includes 1 flying capacitor Cf and two switching tubes, the current collection of first switching tube
Pole connects the anode of flying capacitor Cf, and the emitter of second switching tube connects the cathode of flying capacitor Cf；In previous stage subelement
The emitter and second collector of first switching tube connect the both ends flying capacitor Cf in next stage subelement respectively, most
The emitter of first switching tube in rear stage subelement and the collector of second switching tube are as single-phase bridge arm output end
P；The switch pipe unit connects between the bus capacitor unit and the flying capacitor unit, is made of multiple switch pipe.
Positive direct-current bus, negative DC bus, bridge arm output end are respectively labeled as bus+, bus- and P.
The single-phase topology of the multi-electrical level inverter is numerous, can be that five-electrical level inverter as shown in Figure 1a is single-phase to be opened up
Flutter, be also possible to four electrical level inverters as shown in Figure 1 d it is single-phase topology (its bus capacitor unit by three bus capacitor C1~
C3 is connected in series, and flying capacitor unit has a subelement), it is single-phase to be also possible to seven electrical level inverters as shown in Figure 2 a
Topology (its bus capacitor unit is connected in series by positive and negative busbar capacitor C1~C2, and flying capacitor unit has 2 subelements)
Deng will not enumerate.
For the single-phase topoligical equivalence circuit of multi-electrical level inverter as illustrated in figure 1 c, in order to avoid to flying capacitor
When Cf is pre-charged, there is the problem of switching tube is damaged because bearing entire DC bus-bar voltage stress, the embodiment of the present invention
Disclose the flying capacitor pre-charge circuit of following several multi-electrical level inverters.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment one:
B referring to fig. 2, a kind of flying capacitor pre-charge circuit of multi-electrical level inverter disclosed by the embodiments of the present invention, comprising:
Control unit (not shown) and current limliting module Zd；
Wherein, current limliting module Zd mono- terminates the bridge arm output end P of the multi-electrical level inverter, another negative DC bus of termination
bus-；The effect of current limliting module Zd is the size of limitation charging current, and the current limiting element for including in current limliting module Zd can wrap
Include one in equivalent resistance, equivalent inductance or equivalent capacity or any several combination；When in current limliting module Zd comprising equivalent
When inductance and/or equivalent capacity, current limliting module Zd can also play certain filter action；
Described control unit, (each switching tube opens it to the on-off for controlling switching tube in the multi-electrical level inverter
Between without timing limit), so that between the intermediate node and negative DC bus of two bus capacitors of arbitrary neighborhood bus- formed suspend
Capacitor preliminary filling electrical circuit includes current limliting module Zd in the flying capacitor preliminary filling electrical circuit.
The present embodiment connects current limliting module between the bridge arm output end and negative DC bus bus- of multi-electrical level inverter, then
It is controlled by the on-off to switching tube in multi-electrical level inverter to keep the intermediate node of two bus capacitors of arbitrary neighborhood (right
For Fig. 1 a and Fig. 2 a, intermediate node is exactly DC bus midpoint N；For Fig. 1 d, intermediate node can be bus electricity
Hold C1 and C2 intermediate node, be also possible to the intermediate node of bus capacitor C3 and C2) and negative DC bus between bus- formed
Flying capacitor preliminary filling electrical circuit.Based on this structure, opening in flying capacitor pre-charge circuit powered on moment, multi-electrical level inverter
It closes the maximum voltage stress that pipe is subjected to and is lower than DC bus-bar voltage, this would not cause switching tube because bearing entire DC bus
Voltage stress and damage, to solve the problems, such as of the existing technology.
It is illustrated by taking Fig. 1 a as an example, in order to avoid to the flying capacitor Cf in five-electrical level inverter shown in Fig. 1 a
When being pre-charged, there is the problem of switching tube is damaged because bearing entire DC bus-bar voltage stress, present embodiment discloses
A kind of flying capacitor pre-charge circuit as shown in Figure 2 c, its working principle is that:
When needing to be pre-charged flying capacitor Cf, the control unit control of the flying capacitor pre-charge circuit is opened
Pipe S3 is opened, other switching tubes are held off for pass, and charging current is flowed out through DC bus midpoint N at this time, the body through switching tube S2
Interior diode, switching tube S3, flying capacitor Cf, the internal diode of switching tube S8, current limliting module Zd flow back to negative DC bus
Bus- forms flying capacitor preliminary filling electrical circuit, and as shown in dotted line with the arrow in Fig. 2 c, arrow direction represents current direction.
In the flying capacitor pre-charge circuit, the voltage on the moment that switching tube S3 is opened, flying capacitor Cf is
When zero, the collector potential of switching tube S6 is clamped as DC bus midpoint potential, and the voltage that switching tube S6 is born at this time is answered
Power is only the half of DC bus-bar voltage, is not in switching tube S6 because bearing entire DC bus-bar voltage stress due to asking for damaging
Topic.The voltage stress analysis method of other switching tubes similarly, repeats no more.
Still by taking the flying capacitor pre-charge circuit of five-electrical level inverter as an example, when the exchange side of the five-electrical level inverter adds
Equipped with output filter, when such as LC filter, the bridge arm output end P of a termination five-electrical level inverter of current limliting module Zd can be with
Refer to that one end of current limliting module Zd is directly connected to the output end P of the single-phase bridge arm, as shown in Figure 3；It may also mean that current limliting
One end of module Zd is connected to the bridge arm output end P of five-electrical level inverter by the LC filter, as shown in Figure 4.
Optionally, the flying capacitor pre-charge circuit may also include controllable switch K1, in which:
Controllable switch K1 is connected in series with all or part of current limiting element in current limliting module Zd, as shown in Figure 5 and Figure 6；
The control of controllable switch K1 terminates described control unit.
Controllable switch K1 is in closed state during flying capacitor Cf is pre-charged, in flying capacitor Cf preliminary filling
It is disconnected after the completion of electricity, generates excessive energy loss after multi-electrical level inverter starting to avoid current limliting module Zd.Controllable switch
It is limited between the opening of K1 and each switching tube without timing.
On parts selection, controllable switch K1 can select relay, MOSFET (Metal Oxide
Semiconductor FET, Metal Oxide Semiconductor Field Effect Transistor) or IGBT (Insulated Gate Bipolar
Transistor, insulated gate bipolar transistor) etc. controllable switches device, do not limit to.
Embodiment two:
Referring to Fig. 7, the embodiment of the invention discloses the flying capacitor pre-charge circuit of another multi-electrical level inverter, packets
It includes: control unit (not shown) and current limliting module Zd；
Wherein, current limliting module Zd mono- terminates the bridge arm output end P of the multi-electrical level inverter, another termination positive direct-current bus
bus+；
Described control unit, (each switching tube opens it to the on-off for controlling switching tube in the multi-electrical level inverter
Between without timing limit), so that between the intermediate node and positive direct-current bus bus+ of two bus capacitors of arbitrary neighborhood formed suspend
Capacitor preliminary filling electrical circuit includes current limliting module Zd in the flying capacitor preliminary filling electrical circuit.
Be only that in place of the difference of scheme shown in Fig. 7 and Fig. 2 b: scheme shown in Fig. 2 b is in any two neighboring bus electricity
Flying capacitor preliminary filling electrical circuit is constructed between the intermediate node of appearance and negative DC bus bus-, and scheme shown in Fig. 7 is any
Flying capacitor preliminary filling electrical circuit is constructed between the intermediate node and positive direct-current bus bus+ of two neighboring bus capacitor, but it is solved
The principle of technical problem is identical, therefore repeats no more.
Likewise, the current limiting element in current limliting module Zd may include in equivalent resistance, equivalent inductance or equivalent capacity
One or any several combination.The current limliting module Zd mono- terminates the bridge arm output end P of the multi-electrical level inverter, can be
Refer to that the one end current limliting module Zd meets the bridge arm output end P of the multi-electrical level inverter through output filter, may also mean that current limliting mould
The one end block Zd is connected directly to the bridge arm output end P of the multi-electrical level inverter.The flying capacitor pre-charge circuit can also wrap
It includes: controllable switch；The controllable devices are connected in series with all or part of current limiting element in current limliting module Zd；Described control unit
Connect the control terminal of the controllable devices.
Embodiment three:
A kind of multi-electrical level inverter is also disclosed in the embodiment of the present invention, is pre-charged including any flying capacitor disclosed above
Circuit.
Wherein, the multi-electrical level inverter can be more level single-phase inverters, or more level three-phase inverters,
Do not limit to.
It wherein, is save the cost, more level three-phase inverters are introducing the flying capacitor precharge with controllable switch
When circuit, the three-phase bridge arm of more level three-phase inverters can be enabled to share a controllable switch, as shown in Figure 8: described more
The ontology of level three-phase inverter includes more level three-phase inversion units and output filter；In flying capacitor pre-charge circuit
Current limliting module uses star connection, includes Zd11~Zd13 tri- sub- current limliting modules, and the common point of these three sub- current limliting modules passes through
Controllable switch K1 is connected to negative DC bus bus-.Certainly, the common point of these three sub- current limliting modules can also be through controllable switch
K1 is connected to positive direct-current bus bus+.
Example IV:
Referring to Fig. 9, the embodiment of the invention discloses a kind of flying capacitor pre-charge methods of multi-electrical level inverter, are applied to
The flying capacitor pre-charge circuit of multi-electrical level inverter as described in Fig. 2 b, which comprises
Step S01: judge whether to receive charging instruction；When receiving the charging instruction, S02 is entered step；It is no
Then, return step S01；
Step S02: controlling the on-off of switching tube in the multi-electrical level inverter, so that two bus capacitors of arbitrary neighborhood
Flying capacitor preliminary filling electrical circuit is formed between intermediate node and negative DC bus, includes institute in the flying capacitor preliminary filling electrical circuit
State current limliting module；
Step S03: judge whether the flying capacitor is pre-charged completion；When the flying capacitor, which is pre-charged, to be completed, into
Enter step S04；Otherwise, return step S03；；
Step S04: controlling the on-off of switching tube in the multi-electrical level inverter, so that the flying capacitor preliminary filling electrical circuit
It disconnects.
Referring to Figure 10, the embodiment of the invention discloses the flying capacitor pre-charge methods of another multi-electrical level inverter, answer
Flying capacitor pre-charge circuit for multi-electrical level inverter as described in Figure 7, which comprises
Step S01: judge whether to receive charging instruction；When receiving the charging instruction, S02 is entered step；It is no
Then, return step S01；
Step S02: controlling the on-off of switching tube in the multi-electrical level inverter, so that two bus capacitors of arbitrary neighborhood
Flying capacitor preliminary filling electrical circuit is formed between intermediate node and positive direct-current bus, includes institute in the flying capacitor preliminary filling electrical circuit
State current limliting module；
Step S03: judge whether the flying capacitor is pre-charged completion；When the flying capacitor, which is pre-charged, to be completed, into
Enter step S04；Otherwise, return step S03；；
Step S04: controlling the on-off of switching tube in the multi-electrical level inverter, so that the flying capacitor preliminary filling electrical circuit
It disconnects.
In conclusion the present invention connects current limliting between the bridge arm output end and negative DC bus bus- of multi-electrical level inverter
Module, then the centre controlled by the on-off to switching tube in multi-electrical level inverter to make two bus capacitors of arbitrary neighborhood
The flying capacitor preliminary filling electrical circuit for flowing through the current limliting module is formed between node and negative DC bus bus-.Compared to existing skill
Art, the flying capacitor pre-charge circuit that the present invention designs is in powered on moment, it is ensured that the switching tube in multi-electrical level inverter need to be held
The maximum voltage stress received is lower than DC bus-bar voltage, this would not cause the switching tube in multi-electrical level inverter entire because bearing
DC bus-bar voltage stress and damage.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments in the case where not departing from the spirit or scope of the embodiment of the present invention.Therefore,
The embodiment of the present invention is not intended to be limited to the embodiments shown herein, and be to fit to principles disclosed herein and
The consistent widest scope of features of novelty.
Claims (10)
1. a kind of flying capacitor pre-charge circuit of multi-electrical level inverter characterized by comprising current limliting module and control are single
Member；
Wherein, the current limliting module one terminates the bridge arm output end of the multi-electrical level inverter, another negative DC bus of termination；
Described control unit, for controlling the on-off of switching tube in the multi-electrical level inverter, so that two buses of arbitrary neighborhood
Flying capacitor preliminary filling electrical circuit is formed between the intermediate node of capacitor and negative DC bus, in the flying capacitor preliminary filling electrical circuit
Include the current limliting module.
2. a kind of flying capacitor pre-charge circuit of multi-electrical level inverter characterized by comprising current limliting module and control are single
Member；
Wherein, the current limliting module one terminates the bridge arm output end of the multi-electrical level inverter, another termination positive direct-current bus；
Described control unit, for controlling the on-off of switching tube in the multi-electrical level inverter, so that two buses of arbitrary neighborhood
Flying capacitor preliminary filling electrical circuit is formed between the intermediate node and positive direct-current bus of capacitor, in the flying capacitor preliminary filling electrical circuit
Include the current limliting module.
3. flying capacitor pre-charge circuit according to claim 1 or 2, which is characterized in that the limit in the current limliting module
Fluid element includes one or any several combination in equivalent resistance, equivalent inductance or equivalent capacity.
4. flying capacitor pre-charge circuit according to claim 1 or 2, which is characterized in that the current limliting module one terminates
The bridge arm output end of the multi-electrical level inverter, comprising:
Current limliting module one end connects its bridge arm output end through the output filter of the multi-electrical level inverter, alternatively, the limit
Flow module one end is connected directly to the bridge arm output end of the multi-electrical level inverter.
5. flying capacitor pre-charge circuit according to claim 1 or 2, which is characterized in that the flying capacitor precharge
Circuit further include: controllable switch；
Wherein, the controllable switch is connected in series with all or part of current limiting element in the current limliting module；
Described control unit connects the control terminal of the controllable switch.
6. flying capacitor pre-charge circuit according to claim 5, which is characterized in that the controllable switch be relay,
MOSFET or IGBT.
7. a kind of multi-electrical level inverter, which is characterized in that be pre-charged including flying capacitor of any of claims 1-4
Circuit.
8. a kind of multi-electrical level inverter, which is characterized in that including flying capacitor pre-charge circuit described in claim 5 or 6,
In: when the multi-electrical level inverter is more level three-phase inverters, the three-phase bridge arm of more level three-phase inverters is shared
One controllable switch.
9. a kind of flying capacitor pre-charge method of multi-electrical level inverter, which is characterized in that be applied to as described in claim 1
The flying capacitor pre-charge circuit of multi-electrical level inverter, which comprises
When receiving charging instruction, the on-off of switching tube in the multi-electrical level inverter is controlled, so that two mothers of arbitrary neighborhood
Flying capacitor preliminary filling electrical circuit, the flying capacitor preliminary filling electrical circuit are formed between the intermediate node of line capacitance and negative DC bus
In include the current limliting module；
When the flying capacitor be pre-charged complete when, then in multi-electrical level inverter described in secondary control switching tube on-off so that institute
State the disconnection of flying capacitor preliminary filling electrical circuit.
10. a kind of flying capacitor pre-charge method of multi-electrical level inverter, which is characterized in that be applied to as claimed in claim 2
Multi-electrical level inverter flying capacitor pre-charge circuit, which comprises
When receiving charging instruction, the on-off of switching tube in the multi-electrical level inverter is controlled, so that two mothers of arbitrary neighborhood
Flying capacitor preliminary filling electrical circuit, the flying capacitor preliminary filling electrical circuit are formed between the intermediate node and positive direct-current bus of line capacitance
In include the current limliting module；
When the flying capacitor be pre-charged complete when, then in multi-electrical level inverter described in secondary control switching tube on-off so that institute
State the disconnection of flying capacitor preliminary filling electrical circuit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11831238B2 (en) | 2020-02-21 | 2023-11-28 | Delta Electronics, Inc. | Power conversion system |
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| CN107769601B (en) * | 2017-12-08 | 2019-11-29 | 阳光电源股份有限公司 | Mid-point voltage control method, device and the photovoltaic generating system of multi-level circuit |
| CN109802588A (en) * | 2019-03-06 | 2019-05-24 | 华南理工大学 | A kind of certainly balanced seven electrical level inverters of the capacitor of low voltage stress |
| CN113078815B (en) | 2020-01-03 | 2022-04-15 | 台达电子工业股份有限公司 | Power supply conversion system |
| CN115720049A (en) * | 2021-08-24 | 2023-02-28 | 中兴通讯股份有限公司 | Multi-level capacitor pre-charging circuit and power supply equipment |
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