CN104009658B - Power conversion circuit and power conversion system - Google Patents
Power conversion circuit and power conversion system Download PDFInfo
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- CN104009658B CN104009658B CN201410231197.XA CN201410231197A CN104009658B CN 104009658 B CN104009658 B CN 104009658B CN 201410231197 A CN201410231197 A CN 201410231197A CN 104009658 B CN104009658 B CN 104009658B
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Abstract
The invention provides a power conversion circuit and a power conversion system. The power conversion circuit comprises multiple routes of power bridge arms, at least one first switch, a coupling inductor and a controller. The first switch is connected between at least one of the multiple routes of power bridge rams and at least one of windings contained in the coupling inductor. The controller controls the first switch to be turned off when the output power of the power conversion circuit is smaller than the first threshold value. In the power conversion circuit, when the output power of the power conversion circuit is smaller than a preset threshold value, the current sensed by one of the windings of the coupling inductor can not pass through a diode connected with the corresponding power bridge arm in parallel by controlling the switch between the power bridge arm and the winding of the coupling inductor to be turned off, and therefore rated power loss is reduced, and efficiency of the power conversion circuit is improved.
Description
Technical field
The present invention relates to electric and electronic technical field, especially relate to a kind of power conversion circuit and power becomes
Change system.
Background technology
At present, the multi-electrical level inverter of staggered corresponding technology is used to be used widely.This many level are inverse
Become device and include multiple power brachium pontis of parallel connection, multiple power brachium pontis by the multiple windings in coupling inductance or
Coil couples, and runs in an interleaved manner.Use interleaving technique, both can improve many level inverse
Become the power grade of device, input, output current ripple can be reduced again, it is also possible to reduce magnetic in circuit
The volume of element.
But, in the case of underloading, multiple power brachium pontis work the great shadow of the switching loss brought simultaneously
Ring the lifting of overall efficiency.Although in the case of underloading, can stop by controlling Partial Power brachium pontis
Work promotes overall efficiency, but the electric current that coupling inductance induces also can flow through and out-of-work merit
The diode that rate brachium pontis is in parallel, this will bring extra power attenuation, thus be unfavorable for overall efficiency
Promote further.
Summary of the invention
The embodiment of the present invention provides a kind of power conversion circuit and power conversion system, it is possible to reduce coupling electricity
The power attenuation that the electric current induced brings.
First aspect, proposes a kind of power conversion circuit, including: multichannel power brachium pontis, become by power
The first terminal changing circuit is connected with unidirectional current；Coupling inductance, including multiple windings, passes through power conversion
Second terminal of circuit is connected with alternating current；At least one first switch, is connected to multichannel power bridge
Between at least one road power brachium pontis in arm and at least one winding in multiple winding；Controller, in merit
When the output of rate translation circuit is less than first threshold, controls at least one and first switch off.
In conjunction with first aspect, under the implementation that the first is possible, controller also controls multichannel power bridge
Arm interlocks work, and when the output of power conversion circuit is less than described first threshold, controls extremely
A few road power brachium pontis quits work.
In conjunction with the first possible implementation of first aspect, under the implementation that the second is possible,
Controller also when the output of power conversion circuit is more than Second Threshold, controls at least one and first opens
Close Guan Bi, and control at least one road power brachium pontis work.
In conjunction with the implementation that the second of first aspect is possible, under the implementation that the third is possible,
Controller, when the output of power conversion circuit is between first threshold and Second Threshold, controls at least
Part first in one first switch switches off, and controls to switch, with part first, the power being connected
Brachium pontis quits work.
In conjunction with arbitrary in the third possible implementation of the first of first aspect or first aspect
Planting possible implementation, under the 4th kind of possible implementation, coupling inductance also includes: at least one
Individual voltage clamping device, at least one voltage clamping device is connected across the two ends of at least one winding respectively,
For at least one winding two ends is carried out overvoltage protection.
In conjunction with the 4th kind of possible implementation of first aspect, under the 5th kind of possible implementation,
At least one voltage clamping device includes in varistor, Transient Voltage Suppressor and Zener diode
Kind, or the combination in any of varistor, Transient Voltage Suppressor and Zener diode.
In conjunction with first aspect or any of the above described a kind of possible implementation, the 6th kind of possible realization side
Under formula, power conversion circuit also includes: second switch, is connected between coupling inductance and the second terminal,
For under the control of the controller power conversion circuit being connected to electrical network or disconnecting from electrical network.
In conjunction with first aspect or any of the above described a kind of possible implementation, the 7th kind of possible realization side
Under formula, at least one first switch is catalyst, relay, metal oxide layer semiconductor field effect transistor
Pipe (Metal Oxide Semiconductor, MOSFET), insulated gate bipolar transistor (Insulated
Gate Bipolar Transistor, IGBT), integrated gate commutated thyristor (Integrated Gate
Commutated Thyristor, IGCT) and silicon controlled rectifier (SCR) (Silicon Controlled Rectifier,
SCR) one of, or at least one first switch be catalyst, relay, MOSFET, IGBT,
The combination in any of IGCT and SCR.
In conjunction with first aspect or any of the above described a kind of possible implementation, the 8th kind of possible realization side
Under formula, the first terminal is one of power conversion circuit input and outfan, and the second terminal is power conversion
Another in the input of circuit and outfan.
In conjunction with first aspect or any of the above described a kind of possible implementation, the 9th kind of possible realization side
Under formula, power conversion circuit also includes: filter circuit, and filter circuit is connected to coupling inductance and the second end
Between son, for alternating current is filtered.
Second aspect, it is provided that a kind of three-phase power converters, including: three phase power translation circuit, use
In carrying out power conversion between three-phase alternating current and unidirectional current, wherein every phase power conversion circuit include as
The first of first aspect or first aspect is to any one possible reality in the 8th kind of possible implementation
Power conversion circuit under existing mode.
In conjunction with second aspect, under the implementation that the first is possible, three-phase power converters also includes:
Three electric capacity, the coupling inductance with three phase power translation circuit is connected respectively, for three-phase alternating current
It is filtered.
In conjunction with the first possible implementation of second aspect, under the implementation that the second is possible,
Three-phase power converters also includes: the first center line, for being connected with the center line of electrical network, wherein in first
Line is connected to one end linked together of three electric capacity.
The third aspect, it is provided that a kind of power conversion system, including: the first power conversion circuit and the second merit
Rate translation circuit, wherein the first power conversion circuit is any one the possible implementation such as first aspect
Under power conversion circuit or power conversion under implementation as possible in any one of second aspect
Circuit, for DC power conversion is become alternating current, wherein the first terminal of the first power conversion circuit is the
The input terminal of one power conversion circuit, the second terminal of the first power conversion circuit is the first power conversion
The lead-out terminal of circuit；Second power conversion circuit is any one the possible implementation such as first aspect
Under power conversion circuit, for convert alternating current is become unidirectional current, wherein, the second power conversion circuit
The input terminal that the second terminal is the second power conversion circuit, the first terminal of the second power conversion circuit
It is the lead-out terminal of the second power conversion circuit, and the lead-out terminal of the first power conversion circuit and second
The input terminal of power conversion circuit is connected, or the lead-out terminal of the second power conversion circuit and the first merit
The input terminal of rate translation circuit is connected.
Fourth aspect, it is provided that a kind of power converting method, this includes: control the multichannel of power conversion circuit
Power brachium pontis interlocks work, and wherein at least one road power brachium pontis in this multichannel power brachium pontis passes through at least one
Individual first switch is with at least one winding in multiple windings of the coupling inductance of this power conversion circuit even
Connect；When the output of this power conversion circuit is less than first threshold, control this at least one first open
Close and disconnect.
In conjunction with fourth aspect, under the implementation that the first is possible, the method also includes: at this power
When the output of translation circuit is less than first threshold, controls this at least one road power brachium pontis and quit work.
In conjunction with the first possible implementation of fourth aspect, under the implementation that the second is possible,
When the output of this power conversion circuit is more than Second Threshold, controls this at least one first switch and close
Close, and control this at least one road power brachium pontis work.
In conjunction with the implementation that the second of fourth aspect is possible, under the implementation that the third is possible,
The method also includes: this power conversion circuit output this first threshold and this Second Threshold it
Between time, the part first controlled in this at least one the first switch switches off, and controls and this part
The power brachium pontis that first switch connects quits work.
Based on technique scheme, can be at the output of power conversion circuit less than the threshold value preset
Time, control to be arranged on switching off between power brachium pontis and the winding of coupling inductance so that coupling inductance
The electric current that induces of winding do not flow through the diode in parallel with power brachium pontis, thus reduce extra
Power attenuation, improves the efficiency of power conversion circuit.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below will be in the embodiment of the present invention
The required accompanying drawing used is briefly described, it should be apparent that, drawings described below is only this
Some embodiments of invention, for those of ordinary skill in the art, are not paying creative work
Under premise, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic block diagram of power conversion circuit according to an embodiment of the invention.
Fig. 2 shows the schematic block diagram of the power conversion circuit of another embodiment of the present invention.
Fig. 3 shows the schematic block diagram of the power conversion circuit of another embodiment of the present invention.
Fig. 4 shows the schematic block diagram of the power conversion circuit of another embodiment of the present invention.
Fig. 5 shows the schematic block diagram of the power conversion circuit of another embodiment of the present invention.
Fig. 6 shows the schematic block diagram of the power conversion circuit of another embodiment of the present invention.
Fig. 7 shows the schematic block diagram of the power conversion circuit of another embodiment of the present invention.
Fig. 8 is the schematic block diagram of three-phase power converters according to an embodiment of the invention.
Fig. 9 is the schematic block diagram of power conversion system according to an embodiment of the invention.
Figure 10 is the schematic block diagram of power conversion system according to another embodiment of the present invention.
Figure 11 is the schematic flow diagram of power converting method according to an embodiment of the invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is a part of embodiment of the present invention, and not
It is whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making wound
The every other embodiment obtained on the premise of the property made work, all should belong to the scope of protection of the invention.
Embodiments of the invention are applied to use the multi-level power converter of interleaving technique, the present invention
Embodiment the level grade of multi-level power converter is not construed as limiting, such as, many level power convert
Device can two level power converters, three level power converter and five level power converters etc..This
The type of multi-level power converter is also not construed as limiting by inventive embodiment, and such as, many level power become
Parallel operation can be diode-clamped multi-level power converter, it is also possible to be capacitor-clamped type many level merit
Rate changer etc..
In the case of underloading, work can be stopped by controlling the Partial Power brachium pontis of multi-level power converter
Promote the efficiency of complete machine while making to obtain many level effect, but due to the existence of coupling inductance, stop
The winding that the power brachium pontis of work is connected can induce electric current, and this electric current induced can flow through and stop
The diode that only the power brachium pontis of work is in parallel, thus bring extra power attenuation, it is unfavorable for that complete machine is imitated
The further lifting of rate.
Fig. 1 is the schematic block diagram of power conversion circuit 100 according to an embodiment of the invention.
Power conversion circuit 100 includes multichannel power brachium pontis 120, at least one first switch 130, coupling
Close inductance 140 and controller 150.Wherein, multichannel power brachium pontis 120 is by power conversion circuit 100
The first terminal 110 be connected with unidirectional current；Coupling inductance 140, including multiple windings, is become by power
The second terminal 160 changing circuit 100 is connected with alternating current；At least one first switch 130, connects respectively
At least one at least one road power brachium pontis being connected in N road power brachium pontis 120 and N number of winding around
Between group；Controller 150, when the output of power conversion circuit 100 is less than first threshold, control
Make at least one first switch 130 disconnection.
According to embodiments of the invention, multichannel power brachium pontis 120 can include N road power brachium pontis, and N is
Integer more than or equal to 2, multiple windings that coupling inductance 140 includes can also be N number of winding,
At least one first switch 130 can include M first switch, and wherein, M is less than the integer of N.
N number of winding is coupled into coupling inductance 140 by a magnetic core, the M road power bridge in the power brachium pontis of N road
Arm is connected to M winding in N number of winding of coupling inductance 140 by M first switch respectively,
Power brachium pontis Zhong N-M road, N road power brachium pontis is direct with N-M winding of coupling inductance 140 respectively
Connect.In the case of power conversion circuit normally works (i.e. the load of power conversion circuit is normal),
Controller 150 controls N road power brachium pontis 120 and interlocks work, and such as, N road power brachium pontis 120 is driving
The mode being 360/N degree with the angle of phase shifting in the switch periods of dynamic signal carries out crisscross parallel work
Make.It addition, when the output of power conversion circuit 100 is less than first threshold, i.e. power conversion electricity
When the load on road is underloading, controller 150 controls M first switch 130 disconnection.In other words,
When the load of power conversion circuit 100 is underloading, controller 150 can control M first switch
130 disconnect.Correspondingly, during controller 150 can also control N road power brachium pontis 120 respectively with M
The M road power brachium pontis of the first switch 130 connection quits work, such as: can be at power conversion circuit
When the output of 100 is less than first threshold, controls M road power brachium pontis and quit work, it is also possible in merit
When the output of rate translation circuit 100 is less than another threshold value, controls M road power brachium pontis and quit work.
In other words, control first switches off and controls the M road out-of-work threshold value of power brachium pontis and can be
Same threshold value can also be different threshold values.
According to embodiments of the invention, can be at the output of power conversion circuit less than the threshold value preset
Time, control to be arranged on switching off between power brachium pontis and the winding of coupling inductance so that coupling inductance
The electric current that induces of winding do not flow through the diode in parallel with power brachium pontis, thus reduce extra
Power attenuation, improves the efficiency of power conversion circuit.
Alternatively, as another embodiment, described controller also controls described multichannel power brachium pontis and interlocks work
Make, and when the output of described power conversion circuit is less than described first threshold, described in control extremely
A few road power brachium pontis quits work.
In other words, when the load of power conversion circuit 100 is underloading, controller 150 can control
M the first switch 130 disconnection, and can control in N road power brachium pontis 120 respectively with M the
The M road power brachium pontis of one switch 130 connection quits work.
Alternately, as an another embodiment, described controller also controls N road power brachium pontis and interlocks work,
And when the output of power conversion circuit is less than three threshold values, controls at least one road power brachium pontis and stop
Only work.3rd threshold value can be more than first threshold, it is also possible to less than first threshold, the enforcement of the present invention
This is not construed as limiting by example.When should be understood that the output of power conversion circuit less than three threshold values, power
The load of translation circuit is underloading.
According to embodiments of the invention, power conversion circuit 100 can be rectification circuit or inverter circuit.
Such as, when the first terminal 110 is input, when the second terminal 160 is outfan, power conversion circuit
100 is inverter circuit.On the contrary, when the second terminal 160 is input, and the first terminal 110 is outfan
Time, power conversion circuit 100 is rectification circuit.
According to embodiments of the present invention, controller 150 is also more than at the output of described power conversion circuit
During Second Threshold, control at least one first switch 130 Guan Bi, and control at least one road power brachium pontis
120 work.
Such as, when the output of power conversion circuit 100 is more than Second Threshold, controller 150 can
To control M first switch 130 Guan Bi, and can control in N road power brachium pontis 120 individual with M
The M road power brachium pontis work of the first switch 130 connection.Here, defeated when power conversion circuit 100
When going out power more than Second Threshold, it is believed that power conversion circuit 100 is in the case of normal load
Run.In other words, when power conversion circuit 100 from restoring running in the case of underloading to normally
When running in the case of load, controller 150 can control M first switch 130 Guan Bi, and
The M road power bridge being connected respectively in N road power brachium pontis 120 can be controlled with M first switch 130
Arm interlocks work, in order to reduce extra power attenuation, improves the efficiency of power conversion circuit.
According to embodiments of the present invention, controller 150 also at the output of power conversion circuit 100
Time between one threshold value and Second Threshold, the part first controlled at least one first switch 130 switchs disconnected
Open, and control switchs, with part first, the power brachium pontis being connected respectively and quits work.
Such as, when the output of power conversion circuit 100 is between first threshold and Second Threshold,
Controller 150 can control the K in M first switch 130 individual first and switch off, and permissible
The power brachium pontis controlling to be connected with part the first switch quits work.In other words, power conversion circuit is worked as
When the load of 100 is between underloading and normal load, controller 150 can control M first switch
Partial switch in 130 disconnects, and controls the power brachium pontis being connected respectively with this partial switch disconnected
Quit work, thus reduce extra power attenuation, improve the efficiency of power conversion circuit, simultaneously
The control making power conversion circuit is more flexible.
Should be understood that according to embodiments of the invention, at least one of the present invention first switch can but do not limit
In catalyst, relay, MOSFET, IGBT, IGCT or SCR constant power device or different capacity
Any combination of device.
Embodiments of the invention use above-mentioned intelligence sleep mode to control the power brachium pontis of power conversion circuit
Work, by adding switching device between power brachium pontis and corresponding coupling inductance winding, defeated in difference
The break-make of switching device is controlled, to realize the Partial Power mould under different capacity grade in the case of going out power
The intelligent sleep mode of block, thus decrease extra power attenuation, improve the efficiency of power conversion circuit.
The embodiment of the present invention is described for convenience, skill to the embodiment of the present invention as a example by three power brachium pontis
Art scheme is described in detail, but the embodiment of the present invention is not limited to that.
Fig. 2 shows the schematic block diagram of the power conversion circuit 200 of another embodiment of the present invention.Figure
Power conversion circuit 200 shown in 2 is the example of the embodiment of Fig. 1.Power conversion as shown in Figure 2
Circuit 200 includes: three road power brachium pontis 220, the first switch 230, coupling inductance 240 and controller
250。
Wherein, power brachium pontis 1, power brachium pontis 2 and power brachium pontis 3 are by power conversion circuit 200
The first terminal 210 is connected with unidirectional current；Coupling inductance 240, including being wound in a common core
Three windings L1, L2 and L3, and winding L1, L2 and L3 are by power conversion circuit 200
Second terminal 260 is connected with alternating current；First switch 230, including the first switch Q1 and first switch
Q2.First switch Q1 is connected between power brachium pontis 1 and winding L1, and the first switch Q2 is connected to merit
Between rate brachium pontis 2 and winding L2, wherein, power brachium pontis 3 is directly connected with winding L3；Controller
150, interlock work for controlling three road power brachium pontis 220, and defeated at power conversion circuit 200
When going out power less than first threshold, control the first switch 230 disconnection, and control three road power brachium pontis 220
In quit work with the first power brachium pontis of being connected respectively of switch 230.
Specifically, when the output of power conversion circuit 200 is less than first threshold, controller 250
The first switch Q1 and first switch Q2 can be controlled disconnect, and three road power brachium pontis 220 can be controlled
In with the first switch power brachium pontis 1 of being connected of Q1 and the power brachium pontis 2 that is connected with the first switch Q2
Quit work.
Specifically, when the output of power conversion circuit 200 is more than Second Threshold, controller 250
The first switch Q1 and first switch Q2 Guan Bi can be controlled, and three road power brachium pontis 220 can be controlled
In with the first switch power brachium pontis 1 of being connected of Q1 and the power brachium pontis 2 that is connected with the first switch Q2
Work.
Specifically, when the output of power conversion circuit 200 is between first threshold and Second Threshold,
Controller 250 can control the first switch Q1 and first switch Q2 in one first switch off,
And the power brachium pontis that the first switch that can control and disconnect is connected quits work.Such as: controller
250 can control the first switch Q2 disconnects, and can control the power being connected with the first switch Q2
Brachium pontis 2 quits work.
According to embodiments of the invention, can be at the output of power conversion circuit less than the threshold value preset
Time, control to be arranged on switching off between power brachium pontis and the winding of coupling inductance so that coupling inductance
The electric current that induces of winding do not flow through the diode in parallel with power brachium pontis, thus reduce extra
Power attenuation, improves the efficiency of power conversion circuit.
Alternatively, as another embodiment of the present invention, coupling inductance also includes: at least one voltage clamp
Position device, at least one voltage clamping device is connected across the two ends of at least one winding respectively, for extremely
Few winding two ends carry out overvoltage protection.
Fig. 3 shows the schematic block diagram of the power conversion circuit 300 of another embodiment of the present invention.As
Power conversion circuit 300 shown in Fig. 3, including: N road power brachium pontis 320, at least one first opens
Close 330, coupling inductance 340 and controller 350.The power conversion of power conversion circuit 300 and Fig. 1
Circuit 100 is similar to, and suitably omits detailed description at this.
The coupling inductance 340 of the power conversion circuit 300 of Fig. 3 also includes: at least one voltage clamping
345 two ends being connected across at least one winding respectively, for carrying out overvoltage at least one winding two ends
Protection.
According to embodiments of the present invention, at least one first switch 330 can include M first switch,
Wherein, M is less than the integer of N.M in N number of winding that coupling inductance 340 includes around component
Tong Guo not be connected with the M road power brachium pontis in the power brachium pontis of N road by M first switch, remaining N-M
Individual winding is directly connected to power brachium pontis Zhong N-M road, N road power brachium pontis respectively.At least one voltage
Clamping device 345 can include that M voltage clamping device, M voltage clamping device are connected across respectively
The two ends of M winding, for carrying out overvoltage protection to M winding two ends.
According to embodiments of the invention, can be at the output of power conversion circuit less than the threshold value preset
Time, control to be arranged on switching off between power brachium pontis and the winding of coupling inductance so that coupling inductance
The electric current that induces of winding do not flow through the diode in parallel with power brachium pontis, thus reduce extra
Power attenuation, improves the efficiency of power conversion circuit.
Further, since the first switch can produce higher in the winding of coupling inductance when closed and disconnected
Voltage, therefore, voltage clamping device is connected across winding two ends can carry out overvoltage protection to winding, keeps away
Exempt from winding to burn because of too high voltage.
According to embodiments of the present invention, at least one voltage clamping device 345 includes varistor, transient state electricity
One in pressure suppressor and Zener diode, or varistor, Transient Voltage Suppressor and voltage stabilizing two pole
The combination in any of pipe.
The embodiment of the present invention is described for convenience, skill to the embodiment of the present invention as a example by three power brachium pontis
Art scheme is described in detail, but the embodiment of the present invention is not limited to that.
Fig. 4 shows the schematic block diagram of the power conversion circuit 400 of another embodiment of the present invention.Figure
Power conversion circuit 400 shown in 4 is the example of the embodiment of Fig. 3.Power conversion as shown in Figure 4
Circuit 400 includes: three road power brachium pontis the 420, first switches 430, coupling inductance 440, controller
450 and voltage clamping device 445.
Wherein, power brachium pontis 1, power brachium pontis 2 and power brachium pontis 3 are by power conversion circuit 400
The first terminal 410 is connected with unidirectional current；Coupling inductance 440, including being wound in a common core
Three windings L1, L2 and L3, and winding L1, L2 and L3 are by power conversion circuit 400
Second terminal 460 is connected with alternating current；First switch 430, including the first switch Q1 and first switch
Q2.First switch Q1 is connected between power brachium pontis 1 and winding L1, and the first switch Q2 is connected to merit
Between rate brachium pontis 2 and winding L2, wherein, power brachium pontis 3 is directly connected with winding L3；Controller
450, interlock work for controlling three road power brachium pontis 420, and defeated at power conversion circuit 400
When going out power less than first threshold, control the first switch 430 disconnection, and control three road power brachium pontis 420
In quit work with the first power brachium pontis of being connected of switch 430；Voltage clamping device 445, including electricity
Pressure clamping device K1 and voltage clamping device K2.K1 is connected across the two ends of winding L1, and K2 is connected across
The two ends of winding L2, for carrying out overvoltage protection to the two ends of winding L1 and L2.
Such as: when the output of power conversion circuit 400 is less than first threshold, controller 450 is controlled
System first switch Q1 and first switch Q2 disconnect moment, in coupling inductance 440 respectively with power bridge
Higher voltage can be produced on winding L1 and L2 that arm 1 and power brachium pontis 2 connect, at this time, it may be necessary to logical
Cross voltage clamping device K1 and K2 at the two ends being connected across winding L1 and L2 respectively to winding L1 and
The two ends of L2 carry out overvoltage protection, it is to avoid winding L1 and L2 is burned out because of overtension.
According to embodiments of the invention, can be at the output of power conversion circuit less than the threshold value preset
Time, control to be arranged on switching off between power brachium pontis and the winding of coupling inductance so that coupling inductance
The electric current that induces of winding do not flow through the diode in parallel with power brachium pontis, thus reduce extra
Power attenuation, improves the efficiency of power conversion circuit.
Further, since the first switch can produce higher in the winding of coupling inductance when closed and disconnected
Voltage, therefore, voltage clamping device is connected across winding two ends can carry out overvoltage protection to winding, keeps away
Exempt from winding to burn because of too high voltage.
Alternatively, as another embodiment of the present invention, power-varying circuitry also includes: second switch,
It is connected between coupling inductance and the second terminal, under the control of the controller by power conversion circuit even
Receive electrical network or disconnect from electrical network.
Fig. 5 shows the schematic block diagram of the power conversion circuit 500 of another embodiment of the present invention.As
Power conversion circuit 500 shown in Fig. 5, including: N road power brachium pontis 520, at least one first opens
Close 530, coupling inductance 540 and controller 550.The power conversion of power conversion circuit 500 and Fig. 1
Circuit 100 is similar to, and suitably omits detailed description at this.
The power conversion circuit 500 of Fig. 5 also includes: second switch 570, is connected to coupling inductance 540
And between the second terminal 560, under the control of the controller 550 power conversion circuit 500 being connected
Disconnect to electrical network or from electrical network.
According to embodiments of the present invention, second switch is connected between coupling inductance 540 and the second terminal 560,
When controller 550 switchs 530 according to output power M first of power conversion circuit 500
Before Guan Bi or disconnection, controller 550 second switch to be controlled realizes power conversion circuit 500 and is connected to
Electrical network or from electrical network disconnect.
According to embodiments of the invention, can be at the output of power conversion circuit less than the threshold value preset
Time, control to be arranged on switching off between power brachium pontis and the winding of coupling inductance so that coupling inductance
The electric current that induces of winding do not flow through the diode in parallel with power brachium pontis, thus reduce extra
Power attenuation, improves the efficiency of power conversion circuit.
According to embodiments of the present invention, when the output of power conversion circuit 500 is less than first threshold,
Controller 550 can control second switch and disconnect so that power conversion circuit 500 disconnects from electrical network, then
Control M the first switch 530 disconnection, and can control in N road power brachium pontis 520 with M the
The M road power brachium pontis of one switch 530 connection quits work.
According to embodiments of the present invention, when the output of power conversion circuit 500 is more than Second Threshold,
Controller 550 can control second switch Guan Bi so that power conversion circuit 500 is connected to electrical network, then
Control M the first switch 530 Guan Bi, and can control in N road power brachium pontis 520 with M the
The M road power brachium pontis work of one switch 530 connection.
Specifically, according to embodiments of the present invention, when the output of power conversion circuit 500 is at the first threshold
When being worth between Second Threshold, controller 550 can control the part in M the first switch 530 the
One switches off, and the power brachium pontis that can control to be connected with part the first switch quits work.
The embodiment of the present invention is described for convenience, skill to the embodiment of the present invention as a example by two power brachium pontis
Art scheme is described in detail, for the power conversion circuit of two power brachium pontis, its output
Threshold value is one, it may be assumed that first threshold is equal to Second Threshold, but the embodiment of the present invention is not limited to that,
More threshold value can also be set.
Fig. 6 is the schematic block diagram of power conversion circuit 600 according to another embodiment of the present invention.Figure
Power conversion circuit 600 shown in 6 is the example of the embodiment of Fig. 5.Power conversion circuit 600 includes:
Two-way power brachium pontis 620, first switchs Q1, coupling inductance 640, controller 650 and second switch 670.
Two-way power brachium pontis 620 is power brachium pontis 1 and 2, and coupling inductance 640 includes being wound on same magnetic core
Winding L1 and L2.First switch Q1 is connected between power brachium pontis 1 and winding L1, power bridge
Arm 2 is directly connected to winding L2.
When the output of described power conversion circuit 600 is less than first threshold, controller 650 is permissible
Control second switch 670 to disconnect so that power conversion circuit 600 disconnects from electrical network, then controls first and open
Close Q1 to disconnect, and the power being connected with the first switch Q1 in two-way power brachium pontis 620 can be controlled
Brachium pontis 1 quits work.
When the output of described power conversion circuit 600 is more than first threshold, controller 650 is permissible
Control second switch 670 to close so that power conversion circuit 600 is connected to electrical network, then control first and open
Close Q1 Guan Bi, and the power being connected with the first switch Q1 in two-way power brachium pontis 620 can be controlled
Brachium pontis 1 works.
Alternatively, according to embodiments of the present invention, coupling inductance 640 can also include: a voltage clamp
Device (not shown), a voltage clamping device is connected across the two ends of winding L1, for winding L1
Two ends carry out overvoltage protection.
Alternatively, as another embodiment of the present invention, power-varying circuitry also includes: filter circuit,
Filter circuit is connected between coupling inductance and the second terminal, for being filtered alternating current.
Fig. 7 shows the schematic block diagram of the power conversion circuit 700 of another embodiment of the present invention.As
Power conversion circuit 700 shown in Fig. 7, including: N road power brachium pontis 720, at least one first opens
Close 730, coupling inductance 740 and controller 750.The power conversion of power conversion circuit 700 and Fig. 1
Circuit 100 is similar to, and suitably omits detailed description at this.
The power conversion circuit 700 of Fig. 7 also includes: filter circuit 780, is connected to coupling inductance 740
And between the second terminal 760, for alternating current is filtered.
According to embodiments of the present invention, filter circuit can be electric capacity, and embodiments of the invention are not limited to this,
Such as, filter circuit 780 can also be for the LC filter circuit being made up of inductance and electric capacity or other shape
The filter circuit of formula.
Should be understood that, when power conversion circuit 700 is for commutator, filter circuit 780 is with alternating current power supply (not
Illustrate) be connected, i.e. filter circuit 780 receives alternating current input.
Alternatively, according to embodiments of the present invention, power conversion circuit 700 may include that second switch is (not
Illustrate), this second switch can be connected between coupling inductance 740 and filter circuit 780, it is also possible to
Being connected between filter circuit 780 and the second terminal 760, the embodiment of the present invention is not limited to that.
Alternatively, according to embodiments of the present invention, coupling inductance 740 can also include: at least one voltage
Clamping device (not shown), this at least one voltage clamping device is connected across at least one winding respectively
Two ends, for carrying out overvoltage protection at least one winding two ends.
Fig. 8 is the schematic block diagram of three-phase power converters 800 according to an embodiment of the invention.
Three-phase power converters 800 includes: A phase many level power translation circuit 820, the many level power of B phase
Translation circuit 830 and C phase many level power translation circuit 840, at three-phase alternating current and unidirectional current
Between carry out power conversion.
A phase many level power translation circuit 820, B phase many level power translation circuit 830, C phase are many
Every phase power conversion circuit in level power translation circuit 840 is as described in the embodiment of Fig. 1 to Fig. 6
Power conversion circuit.
Alternatively, as another embodiment, three-phase power converters 800 also includes: three electric capacity, bag
Include A phase electric capacity C1, B phase electric capacity C2 and C phase electric capacity C3, for the coupling of power conversion circuit
The leakage inductance of inductance combines, and is filtered three-phase alternating current, and one end of each electric capacity in three electric capacity is divided
It is not connected with the second terminal of the phase power conversion circuit in three phase power translation circuit, these three electricity
The other end in appearance links together.
Alternatively, as another embodiment, three-phase power converters 800 also includes the first center line N, uses
Being connected in the center line with electrical network, wherein this first center line is connected to A phase electric capacity C1, B phase electric capacity C2
One end linked together with each electric capacity in C phase electric capacity C3.
Should be understood that three-phase power converters 800 can be three-phase power inverter, receive access respectively
DC voltage 810, and export three-phase alternating voltage V_a, V_b and V_c through inversion.
Should be understood that three-phase power converters 800 can also be respectively used to receive for three phase power commutator
Three-phase alternating current input voltage V_a, V_b and V_c, and export DC voltage through over commutation.
According to embodiments of the invention, can be at the output of power conversion circuit less than the threshold value preset
Time, control to be arranged on switching off between power brachium pontis and the winding of coupling inductance so that coupling inductance
The electric current that induces of winding flow through and do not flow through the diode in parallel with power brachium pontis, thus reduce volume
Outer power attenuation, improves the efficiency of power inverter.
Fig. 9 is the schematic block diagram of power conversion system 900 according to an embodiment of the invention.Merit
Rate transformation system 900 includes the first power conversion circuit and the second power conversion circuit, is used for realizing exchange
/ exchange (AC/AC) conversion.First power conversion circuit can be power conversion electricity as described in Figure 3
Road 300, for becoming alternating current by DC power conversion.Second power conversion circuit can be as described in Figure 5
Power conversion circuit 500, for convert alternating current is become unidirectional current.Power conversion circuit 300 defeated
Enter terminal to be connected with the lead-out terminal of power conversion circuit 500.In other words, the second power conversion electricity
The direct current output on road is connected to the first power conversion circuit direct current input, thus realizes AC/AC conversion.
Should be understood that in the present embodiment, the first power conversion circuit and the second power conversion circuit can divide
The most controlled it is formed on controller 350 and controller 550, it is also possible to be controlled by same controller 950.
According to embodiments of the invention, can be at the output of power conversion circuit less than the threshold value preset
Time, control to be arranged on switching off between power brachium pontis and the winding of coupling inductance so that coupling inductance
The electric current that induces of winding flow through and do not flow through the diode in parallel with power brachium pontis, thus reduce volume
Outer power attenuation, improves the efficiency of power conversion system.
Figure 10 is the schematic block diagram of power conversion system 1000 according to another embodiment of the present invention.
Power conversion system 1000 includes the first power conversion circuit and the second power conversion circuit, is used for realizing
DC-DC (DC/DC) converts.First power conversion circuit can be that power as described in Figure 3 becomes
Change circuit 300, for DC power conversion is become alternating current.Second power conversion circuit can be such as Fig. 5
Described power conversion circuit 500, for becoming unidirectional current by convert alternating current.Power conversion circuit 300
Lead-out terminal be connected with the input terminal of power conversion circuit 500.In other words, the first power becomes
The exchange output changing circuit is connected to the second power conversion circuit exchange input, thus realizes DC/DC and become
Change.
Should be understood that in the present embodiment, the first power conversion circuit and the second power conversion circuit can divide
The most controlled it is formed on controller 350 and controller 550, it is also possible to be controlled by same controller 1050.
According to embodiments of the invention, can be at the output of power conversion circuit less than the threshold value preset
Time, control to be arranged on switching off between power brachium pontis and the winding of coupling inductance so that coupling inductance
The electric current that induces of winding flow through and do not flow through the diode in parallel with power brachium pontis, thus reduce volume
Outer power attenuation, improves the efficiency of power conversion circuit.
Figure 11 is the schematic flow diagram of power converting method 1100 according to an embodiment of the invention.
Power converting method 1100 shown in Figure 11 includes following content.
1110, the multichannel power brachium pontis controlling power conversion circuit interlocks work, wherein this multichannel power bridge
At least one road power brachium pontis in arm is by least one the first switch and the coupling of this power conversion circuit
At least one winding in multiple windings of inductance connects.
1120, when the output of this power conversion circuit is less than first threshold, control this at least one
First switches off.
According to embodiments of the present invention, power converting method 1100 can be performed by controller.Become at power
Parallel operation normally works in the case of (i.e. the load of power inverter is normal), and controller can control multichannel
Power brachium pontis interlocks work, and wherein at least one road power brachium pontis in this multichannel power brachium pontis passes through at least one
Individual first switch is with at least one winding in multiple windings of the coupling inductance of this power conversion circuit even
Connect.When the output of power conversion circuit is less than first threshold, i.e. the load of power conversion circuit is
During underloading, controller can control this at least one first switch off.Correspondingly, controller is all right
Control at least one road power brachium pontis to quit work, such as: can be little at the output of power conversion circuit
When first threshold, control at least one road power brachium pontis and quit work, it is also possible at power conversion circuit
When output is less than another threshold value, controls at least one road power brachium pontis and quit work.In other words, control
It can be same that device processed control first to switch off and control at least one road out-of-work threshold value of power brachium pontis
One threshold value can also be different threshold values.This at least one road power brachium pontis out-of-work be with disconnect this extremely
The power brachium pontis that a few switch correspondence connects.
According to embodiments of the invention, can be at the output of power conversion circuit less than the threshold value preset
Time, control to be arranged on switching off between power brachium pontis and the winding of coupling inductance so that coupling inductance
The electric current that induces of winding flow through and do not flow through the diode in parallel with power brachium pontis, thus reduce volume
Outer power attenuation, improves the efficiency of power conversion circuit.
Alternatively, as another embodiment of the present invention, power converting method 1100 also includes: in merit
When the output of rate translation circuit is less than first threshold, controls at least one road power brachium pontis and quit work.
According to embodiments of the present invention, when the output of power conversion circuit is less than first threshold, i.e. merit
When the load of rate translation circuit is underloading, controller can control at least one first switch off same
Time control control at least one road power brachium pontis quit work.
Alternatively, as another embodiment, controller at the output of power conversion circuit less than the
During one threshold value, control at least one and first switch off, at the output of power conversion circuit less than the
During three threshold values, control at least one road power brachium pontis and quit work.3rd threshold value can be more than first threshold,
Might be less that this is not construed as limiting by first threshold, embodiments of the invention.Should be understood that power conversion electricity
When the output on road is less than three threshold values, the load of power conversion circuit is underloading.
Alternatively, as another embodiment of the present invention, power converting method 1100 also includes: at this
When the output of power conversion circuit is more than Second Threshold, control this at least one first switch Guan Bi,
And control this at least one road power brachium pontis to interlock work.
According to embodiments of the present invention, when the output of power conversion circuit is more than Second Threshold, permissible
Thinking that power inverter runs in the case of normal load, controller can control this at least one
First switch Guan Bi, and this at least one tunnel that at least one first switch is connected respectively with this can be controlled
Power brachium pontis interlocks work, in order to reduce extra power attenuation, improves the efficiency of power conversion circuit.
Alternatively, as another embodiment of the present invention, power converting method 1100 also includes: at this
When the output of power conversion circuit is between this first threshold and this Second Threshold, control this at least one
Part first in individual first switch switches off, and controls to switch, with this part first, the power being connected
Brachium pontis quits work.
According to embodiments of the present invention, when power conversion circuit output this first threshold with this second
Time between threshold value, it is believed that the load of power conversion circuit, between underloading and normal load, controls
The part that device can control at least one first switch switches off, and controls and this portion disconnected
The power brachium pontis that switch-dividing connects respectively quits work, thus reduces extra power attenuation, improves
The efficiency of power conversion circuit, the control simultaneously making power conversion circuit is more flexible.
Although by with reference to accompanying drawing and by the way of combining preferred embodiment to the present invention have been described in detail,
But the present invention is not limited to this.Without departing from the spirit and substance of the premise in the present invention, this area is common
Technical staff can carry out amendment or the replacement of various equivalence to embodiments of the invention, and these amendments or
Replacing all should be in the covering scope of the present invention.
Claims (18)
1. a power conversion circuit, it is characterised in that including:
Multichannel power brachium pontis, is connected with unidirectional current by the first terminal of described power conversion circuit；
Coupling inductance, including multiple windings, by the second terminal and the alternating current of described power conversion circuit
Connect；
At least one first switch, is connected at least one road power bridge in described multichannel power brachium pontis
Between at least one winding in arm and the plurality of winding；
Controller, when the output of described power conversion circuit is less than first threshold, described in control extremely
Few one first switches off.
Power conversion circuit the most according to claim 1, it is characterised in that described controller is also
Control described multichannel power brachium pontis to interlock work, and be less than at the output of described power conversion circuit
During described first threshold, described in control, at least one road power brachium pontis quits work.
Power conversion circuit the most according to claim 2, it is characterised in that described controller is also
When the output of described power conversion circuit is more than Second Threshold, control described at least one first open
Close Guan Bi, and at least one road power brachium pontis work described in control.
Power conversion circuit the most according to claim 3, it is characterised in that described controller is also
When the output of described power conversion circuit is between described first threshold and described Second Threshold, control
Part first in system at least one first switch described switches off, and controls and described part first
The power brachium pontis that switch connects quits work.
5. according to the power conversion circuit according to any one of claim 1-4, it is characterised in that institute
Stating coupling inductance also to include: at least one voltage clamping device, at least one voltage clamping device described divides
It is not connected across the two ends of at least one winding described, at least one winding two ends described are carried out overvoltage
Protection.
Power conversion circuit the most according to claim 5, it is characterised in that described at least one
Voltage clamping device includes the one in varistor, Transient Voltage Suppressor and Zener diode, or institute
State the combination in any of varistor, Transient Voltage Suppressor and Zener diode.
7. according to the power conversion circuit according to any one of claim 1-4, it is characterised in that also
Including: second switch, it is connected between described coupling inductance and described second terminal, in described control
Under the control of device processed, described power conversion circuit is connected to electrical network or disconnects from described electrical network.
8. according to the power conversion circuit described in any one in claim 1-4, it is characterised in that
At least one first switch described is catalyst, relay, metal oxide layer semiconductor field-effect transistor
MOSFET, insulated gate bipolar transistor IGBT, integrated gate commutated thyristor IGCT and controlled
One of silicon rectifier SCR, or described at least one first switch for catalyst, relay,
The combination in any of MOSFET, IGBT, IGCT and SCR.
9. according to the power conversion circuit described in any one in claim 1-4, described the first terminal
For one of described power conversion circuit input and outfan, described second terminal is described power conversion electricity
Another in the input on road and outfan.
10. according to the power conversion circuit according to any one of claim 1-4, it is characterised in that also
Including: filter circuit, described filter circuit is connected between described coupling inductance and described second terminal,
For described alternating current is filtered.
11. 1 kinds of three-phase power converters, it is characterised in that including:
Three phase power translation circuit, for carrying out power conversion between three-phase alternating current and unidirectional current, its
In every phase power conversion circuit include according to the power conversion circuit according to any one of claim 1-9.
12. three-phase power converters according to claim 11, it is characterised in that also include:
Three electric capacity, the coupling inductance with described three phase power translation circuit is connected respectively, for described three
Cross streams electricity is filtered.
13. three-phase power converters according to claim 12, it is characterised in that also include:
First center line, for being connected with the center line of electrical network, wherein said first center line is connected to described three
One end linked together of individual electric capacity.
14. 1 kinds of power conversion systems, it is characterised in that including: the first power conversion circuit and second
Power conversion circuit,
Wherein said first power conversion circuit is according to the power according to any one of claim 1-13
Translation circuit, for becoming alternating current, the first of wherein said first power conversion circuit by DC power conversion
Terminal is the input terminal of the first power conversion circuit, and the second terminal of described first power conversion circuit is
The lead-out terminal of described first power conversion circuit；
Described second power conversion circuit is according to the power conversion according to any one of claim 1-13
Circuit, for convert alternating current is become unidirectional current, wherein, the second end of described second power conversion circuit
Son is the input terminal of the second power conversion circuit, and the first terminal of described second power conversion circuit is
The lead-out terminal of two power conversion circuits, and the lead-out terminal of described first power conversion circuit is with described
The input terminal of the second power conversion circuit is connected, or the lead-out terminal of described second power conversion circuit
It is connected with the input terminal of described first power conversion circuit.
15. 1 kinds of power converting methods, it is characterised in that including:
The multichannel power brachium pontis controlling power conversion circuit interlocks work, in wherein said multichannel power brachium pontis
At least one road power brachium pontis by least one first switch with described power conversion circuit couple electricity
At least one winding in multiple windings of sense connects；
When the output of described power conversion circuit is less than first threshold, control described at least one the
One switches off.
16. power converting methods according to claim 15, it is characterised in that also include:
When the output of described power conversion circuit is less than first threshold, at least one tunnel merit described in control
Rate brachium pontis quits work.
17. power converting methods according to claim 16, it is characterised in that also include:
When the output of described power conversion circuit is more than Second Threshold, control described at least one the
One switch Guan Bi, and at least one road power brachium pontis work described in control.
18. power converting methods according to claim 17, it is characterised in that also include:
At the output of described power conversion circuit between described first threshold and described Second Threshold
Time, the part first controlled at least one first switch described switches off, and controls and described portion
The power brachium pontis dividing the first switch to connect quits work.
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| CN104079195B (en) * | 2014-06-30 | 2017-01-25 | 华为技术有限公司 | Power conversion circuit and power conversion system |
| US9966853B2 (en) * | 2015-10-05 | 2018-05-08 | Maxim Integrated Products, Inc. | Method and apparatus for multi-phase DC-DC converters using coupled inductors in discontinuous conduction mode |
| CN106849727B (en) * | 2017-03-10 | 2019-01-04 | 华中科技大学 | A kind of crisscross parallel inverter |
| US20200081504A1 (en) * | 2018-09-12 | 2020-03-12 | Quanta Computer Inc. | Method and system for current sharing balance in three-phase input source system |
| CN112234645B (en) * | 2020-09-02 | 2022-10-04 | 华为数字能源技术有限公司 | Power converter, photovoltaic power generation system, method and device |
| CN112448605A (en) * | 2021-02-01 | 2021-03-05 | 深圳英飞源技术有限公司 | Inverter circuit based on coupling transformer |
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| US7423894B2 (en) * | 2006-03-03 | 2008-09-09 | Advanced Energy Industries, Inc. | Interleaved soft switching bridge power converter |
| JP2009273228A (en) * | 2008-05-07 | 2009-11-19 | Panasonic Corp | Power unit and air conditioner having the same |
| CN101841236A (en) * | 2010-04-22 | 2010-09-22 | 华为技术有限公司 | Power factor correction converter and control method thereof |
| CN102624274A (en) * | 2011-01-30 | 2012-08-01 | 上海康威特吉能源技术有限公司 | Interleaving parallel grid-connected inverter and control method thereof |
| CN203071836U (en) * | 2013-01-22 | 2013-07-17 | 湖南天佳电子技术有限公司 | Mixed microgrid system and AC/DC coupler thereof |
| CN103607132A (en) * | 2013-11-28 | 2014-02-26 | 上海应用技术学院 | NPC three-level inverter circuit with fault-tolerance topology and control method thereof |
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