CN208424231U - Five level topology units and five level AC/DC convertors - Google Patents
Five level topology units and five level AC/DC convertors Download PDFInfo
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- CN208424231U CN208424231U CN201820652096.3U CN201820652096U CN208424231U CN 208424231 U CN208424231 U CN 208424231U CN 201820652096 U CN201820652096 U CN 201820652096U CN 208424231 U CN208424231 U CN 208424231U
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Abstract
The utility model relates to a kind of five level topology units.The five level topology unit includes first switch device, second switch device, third switching device, the 4th switching device, the 5th switching device, the 6th switching device, the 7th switching device, the 8th switching device, the 9th switching device, the tenth switching device；First capacitor, the second capacitor, third capacitor and the 4th capacitor；Five level topology units are worked under the action of each switching device in five operation modes, to meet the alternating voltage at exchange end.The utility model further relates to a kind of five level AC/DC convertors.Above-mentioned five level topology unit and five level AC/DC convertors, in one timing of DC voltage, the maximum amplitude for exchanging the alternating current at end is higher.Therefore, can reduce exchange the grid-connected transformer in side with exchange the cost and loss of cable, to reduce the cost of whole system；And system reliability is high, high-efficient；The versatility of the encapsulating structure of switching device is high, small in size.
Description
Technical field
The utility model relates to power electronics field, in particular to a kind of five level topology units and five level are handed over directly
Current converter.
Background technique
Two-way AC/DC convertor is a kind of direct current energy is converted into AC energy or is converted into AC energy directly
The converter of galvanic electricity energy.Increasingly increase with progress, demand of the mankind to the energy with the continuous development of society, photovoltaic, energy storage etc.
New energy is also increasing in energy specific gravity accounting.As its core, photovoltaic DC converter and energy accumulation current converter are in recent years
It is also more and more fierce in market competition.In order to meet the market demand, more and more more level AC/DC convertors are pushed into market,
Such as five level AC/DC convertor.
Five level AC/DC convertors currently on the market have the complicated measure of pressure and absorbing circuit, this will lead to
The loss of five level AC/DC convertors is big, low efficiency, eventually leads to the higher cost of five level AC/DC convertors.
Utility model content
Based on this, it is necessary to for these problems of five level AC/DC convertors, provide a kind of five level topology units
And five level AC/DC convertor.
A kind of five level topology units, comprising:
First switch device, second switch device, third switching device, the 4th switching device, the 5th switching device, the 6th
Switching device, the 7th switching device, the 8th switching device, the 9th switching device, the tenth switching device；First capacitor, the second electricity
Appearance, third capacitor and the 4th capacitor；
The five level topology unit is connect with DC power supply；Between the direct current anode and direct current negative terminal of the DC power supply
It is parallel with the first branch, second branch and third branch；
Wherein, the first branch includes the connected first capacitor and second capacitor, the first capacitor and
Circuit midpoint between second capacitor is as the first connecting pin；The first capacitor is not connected with the electricity of first connecting pin
Pole connects the direct current anode of DC power supply, and the electrode that second capacitor is not connected with first connecting pin connects the direct current
The direct current negative terminal in source；
The second branch includes the sequentially connected second switch device, the third switching device, the described 4th
Switching device and the 5th switching device, the second switch device be not connected with one end of the third switching device with it is described
The connection of direct current anode, one end that the 5th switching device is not connected with the 4th switching device is connect with the direct current negative terminal；
The third direct current includes the sequentially connected first switch device, the 7th switching device, the described 8th
Switching device and the 6th switching device, the first switch device are not connected with one end connection institute of the 7th switching device
Direct current anode is stated, one end that the 6th switching device is not connected with the 8th switching device connects the direct current negative terminal；It is described
7th switching device is used as with the public connecting end of the 8th switching device and exchanges end；
9th switching device and the tenth switching device be set to first connecting pin with it is described exchange end it
Between circuit on；
Public connecting end between the first switch device and the 7th switching device by the third capacitor with
The second switch device is connect with the public connecting end of the third switching device；6th switching device and the described 8th
The public affairs that the public connecting end of switching device passes through the 4th capacitor and the 4th switching device and the 5th switching device
Connecting pin connection altogether；
Within a duty cycle of the five level topology unit, the five level topology unit successively works described
First operation mode, second operation mode, the third operation mode, second operation mode, first work
Mode, the 4th operation mode, the 5th operation mode, the 4th operation mode and first operation mode, with
So that exchange end output AC voltage；
When five level topology unit work is in first operation mode, the voltage at the exchange end is zero；
When five level topology unit work is in the second operation mode, the five level topology unit exchanges the electricity at end
It presses equal with the voltage of the direct current anode；
When five level topology unit work is in the third operation mode, the voltage at the exchange end is described straight
Twice for flowing the voltage of anode；
When five level topology unit work is in four operation mode, the voltage at the exchange end and described straight
It is equal to flow negative terminal；
When five level topology unit work is in five operation mode, the voltage at the exchange end is described straight
Twice for flowing negative terminal voltage.
The first switch device, third switching device, the 4th switching device, the 6th open in one of the embodiments,
Close device, the 9th switching device, the tenth switch device conductive, other switching devices cut-off, so that the five level topology unit
Work is in the first operation mode；
First switch device, third switching device, the 4th switching device, the 6th switching device, the 7th switching device, the tenth
Switch device conductive, other switching devices cut-off, so that five level topology unit work is in the second operation mode；
Second switch device, the 4th switching device, the 6th switching device, the 7th switch device conductive, other switching devices
Cut-off, so that five level topology unit work is in third operation mode；
First switch device, third switching device, the 4th switching device, the 6th switching device, the 8th switching device, the 9th
Switch device conductive, other switching devices cut-off, so that five level topology unit work is in the 4th operation mode；
First switch device, third switching device, the 5th switching device, the 8th switch device conductive, other switching devices
Cut-off, so that five level topology unit work is in the 5th operation mode.
The five level topology unit further includes the first inductance in one of the embodiments,；The third switching device
It is connect by the first inductance with the first connecting pin with the public connecting end of the 4th switching device.
The five level topology unit further includes the 13rd diode and the 14th pole in one of the embodiments,
Pipe, the anode of the 13rd diode connect with first connecting pin, the cathode of the 13rd diode and described the
Two switching devices are connected with the public connecting end of the third switching device；The cathode and described first of 14th diode
Connecting pin connection, the anode of the 14th diode and the public company of the 4th switching device and the 5th switching device
Connect end connection.
The 9th switching device is connected with the tenth switching device in one of the embodiments, and the described 9th opens
It closes device and connects first connecting pin, the tenth switching device connects the exchange end.
9th switching device and the tenth switching device inverse parallel in one of the embodiments, the described 9th
Switching device is connect with a public connecting end of the tenth switching device with first connecting pin, another public connecting end with
The exchange end connection.
A kind of five level AC/DC convertors include:
Five level topology unit described in any of the above-described embodiment；
Control unit, for controlling the on state or off state of each switching device in the five level topology unit,
So that the work of five level AC/DC convertors is in corresponding mode.
Described control unit is separately connected with each switching device in one of the embodiments,；Described control unit
Control signal include first voltage signal, second voltage signal and tertiary voltage signal；Described control unit passes through will be described
The voltage value of first voltage signal and the second voltage signal synchronization comparison result as the first switch device
Part, the second switch device, the third switching device, the 4th switching device, the 5th switching device and described
The driving signal of 6th switching device；
Described control unit by by the voltage value of the first voltage signal and the tertiary voltage signal in same a period of time
The comparison result at quarter is opened as the 7th switching device, the 8th switching device, the 9th switching device, the described tenth
Close the driving signal of device；Each switching device on or off under corresponding driving signal.
The waveform of the first voltage signal is sine wave in one of the embodiments,；The second voltage signal and
The waveform of the tertiary voltage signal distinguishes triangular wave.
The five level AC/DC convertors in one of the embodiments, further include:
Side filter unit is exchanged, one end of the ac filter unit connects with the end that exchanges of the five level topology unit
It connects, the ac filter unit is used to improve the waveform of the alternating current at the exchange end.
Above-mentioned five level topology unit and five level AC/DC convertors, are converted into exchange for the direct current of DC power supply
Electricity output or the direct current electricity output that the alternating current for exchanging side is converted into DC side.At one of the five level topology unit
In duty cycle, the five level topology unit successively works in first operation mode, second operation mode, described
Third operation mode, second operation mode, first operation mode, the 4th operation mode, the 5th work
Mode, the 4th operation mode and first operation mode.When work is in the first operation mode, the voltage for exchanging end is
Zero.When work is in the second operation mode, the voltage for exchanging end is equal with the voltage of direct current anode.When work is in third Working mould
When state, the voltage for exchanging end is twice of voltage of direct current anode.When work is in four operation modes, exchange the voltage at end with
Direct current negative terminal is equal.When work is in five operation modes, the voltage for exchanging end is twice of direct current negative terminal voltage.Therefore, exist
One timing of DC voltage of DC power supply, the maximum amplitude for exchanging the alternating current at end is twice of DC voltage.That is,
One timing of DC voltage of DC power supply, the amplitude for exchanging the alternating current at end is higher, and the voltage effective value of alternating current is higher.In phase
With under power grade, since to exchange higher then its alternating current of side voltage smaller for it.In this way, five level topology unit transfer efficiencies
Height, and be lost small.Therefore, under equal-wattage grade, cost is relatively low for five level topology units.In addition, loading demand compared with
When high alternating voltage, since alternating current is small, the isolating transformer and exchange cable of AC/DC convertor exchange side can be reduced
Cost, to reduce the cost of system.
Detailed description of the invention
Fig. 1 is the circuit diagram of five level topology units of an embodiment；
Fig. 2 is the equivalent circuit diagram that five level topology unit shown in FIG. 1 works in the first operation mode；
Fig. 3 is the equivalent circuit diagram that five level topology unit shown in FIG. 1 works in the second operation mode；
Fig. 4 is the equivalent circuit diagram that five level topology unit shown in FIG. 1 works in third operation mode；
Fig. 5 is the equivalent circuit diagram that five level topology unit shown in FIG. 1 works in four operation modes；
Fig. 6 is the equivalent circuit diagram that five level topology unit shown in FIG. 1 works in five operation modes；
Fig. 7 each switching device and working sequence waveform at exchange end when being the five level topology units work of an embodiment
Figure；
Fig. 8 is the circuit diagram of five level topology units of another embodiment；
Fig. 9 is the circuit diagram of five level topology units of another embodiment；
Figure 10 is each voltage signal in five level AC/DC convertor of an embodiment, each switching device and the work for exchanging end
Timing diagram；
Figure 11 is the schematic diagram of the single-phase five level AC/DC convertor of an embodiment；
Figure 12 is the schematic diagram of the five level AC/DC convertor of phase three-wire three of an embodiment；
Figure 13 is the schematic diagram of the five level AC/DC convertor of phase three-wire three of another embodiment；
Figure 14 is the schematic diagram of the five level AC/DC convertor of three-phase and four-line of an embodiment.
Specific embodiment
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing to this
The specific embodiment of utility model is described in detail.
Fig. 1 is the circuit diagram of five level topology units 200 of an embodiment.The five level topology unit 200 application
In five level AC/DC convertors, five level topology units 200 are used to the direct current of DC power supply 100 being changed into alternating current
Output.
The five level topology unit 200 include: first switch device Q1, second switch device Q2, third switching device Q3,
4th switching device Q4, the 5th switching device Q5, the 6th switching device Q6, the 7th switching device Q7, the 8th switching device Q8,
Nine switching device Q9, the tenth switching device Q10, first capacitor C1, the second capacitor C2, third capacitor C3 and the 4th capacitor C4.
As shown in Figure 1, all switching devices are switching tube, one two pole of either switch pipe inverse parallel in the present embodiment
Pipe.In other embodiments, switching device is also possible to the switch other than switching tube, such as optoelectronic switch etc., as long as can be real
The conducting and disconnection of existing circuit.
The connection relationship of each device is as follows in five level topology units 200: the direct current anode and direct current negative terminal of DC power supply
Between be parallel with the first branch, second branch and third branch.
The first branch includes connected first capacitor and the second capacitor.That is first capacitor C1 and the second capacitor C2 connection, the
Circuit midpoint between one capacitor C1 and the second capacitor C2 is as the first connecting pin M1；First capacitor C1 is not connected with the first connecting pin
The direct current anode DC+ of the electrode connection DC power supply 100 of M1, the electrode connection that the second capacitor C2 is not connected with the first connecting pin M1 are straight
The direct current negative terminal DC- in galvanic electricity source 100.That is first capacitor C1 is not connected with the electrode connection DC power supply 100 of the first connecting pin M1
Positive bus-bar, the second capacitor C2 are not connected with the negative busbar of the electrode connection DC power supply 100 of the first connecting pin M1, the first connecting pin M1
For bus midpoint M1, using bus midpoint M1 voltage as reference point, voltage is set as zero.In the present embodiment, in the voltage of description each point
When value, reference point is bus midpoint M1.
Second branch includes that sequentially connected second switch device, third switching device, the 4th switching device and the 5th are opened
Close device.That is second switch device Q2, third switching device Q3, the 4th switching device Q4 and the 5th switching device Q5 successively connect
It connects, one end that second switch device Q2 is not connected with third switching device is connect with direct current anode DC+, and the 5th switching device Q5 does not connect
The one end for connecing the 4th switching device is connect with direct current negative terminal DC-.Public affairs between second switch device Q2 and third switching device Q3
Connecting pin is second connection end M2 altogether.In this way, second switch device Q2, third switching device Q3, the 4th switching device Q4 and
The encapsulation of I type three-level structure can be used in five switching device Q5, to reduce packaging cost, increases its reliability and versatility.
Third branch includes sequentially connected first switch device, the 7th switching device, the 8th switching device and the 6th opens
Close device.First switch device Q1, the 7th switching device Q7, the 8th switching device Q8 and the 6th switching device Q6 are sequentially connected,
One end that first switch device Q1 is not connected with the 7th switching device connects direct current anode DC+, the 6th switching device Q6 not connected the
One end of eight switching devices connects direct current negative terminal DC-；The public connecting end of 9th switching device Q9 and the tenth switching device Q10 is made
To exchange end AC.Tenth switching device Q10 and the 9th switching device Q9 is set to the first connecting pin and exchanges the circuit between end
On.In the present embodiment, the 9th switching device Q9 connects with the tenth switching device Q10, the 9th switching device Q9 connection first connection
End, the tenth switching device Q10 connection exchange end AC.In this way, the 7th switching device Q7, the tenth switching device Q10, the 9th derailing switch
The encapsulation of T-type three-level structure can be used in part Q9, the 8th switching device Q8, to reduce packaging cost, increases its reliability and leads to
With property, and reduce packaging cost.
Public connecting end (being defined as third connecting pin M3) between first switch device Q1 and the 7th switching device Q7 is logical
Cross the public connecting end (being defined as the 5th connecting pin M5) of third capacitor C3 Yu second switch device Q2 and third switching device Q3
Connection.I.e. the public connecting end of first switch device Q1, the 7th switching device Q7 and third capacitor C3 are third connecting pin M3.The
The public connecting end of two switching device Q2, third switching device Q3 and third capacitor C3 are the 5th connecting pin M5.
The public connecting end (being defined as the 4th connecting pin M4) of 6th switching device Q6 and the 8th switching device Q8 passes through the
Four capacitor C4 are connect with the 4th switching device Q4 with the public connecting end (being defined as the 6th connecting pin M6) of the 5th switching device Q5.
The public connecting end of 6th switching device Q6, the 8th switching device Q8 and the 4th capacitor C4 are the 4th connecting pin M4.4th switch
The public connecting end of device Q4, the 5th switching device Q5 and the 4th capacitor C4 are defined as the 6th connecting pin M6.
Fig. 2 is the equivalent circuit diagram that five level topology unit 200 shown in FIG. 1 works in the first operation mode H1；Fig. 3
It is the equivalent circuit diagram that five level topology unit 200 shown in FIG. 1 works in the second operation mode H2；Fig. 4 is shown in FIG. 1
The equivalent circuit diagram that five level topology units 200 work in third operation mode H3；Fig. 5 is five level topology shown in FIG. 1
The equivalent circuit diagram that unit 200 works in the 4th operation mode H4；Fig. 6 is that five level topology unit 200 shown in FIG. 1 works
Equivalent circuit diagram in the 5th operation mode H5.The work of five level topology units 200 includes the first work in five operation modes
Make mode H1, the second operation mode H2, third operation mode H3, the 4th operation mode H4 and the 5th operation mode H5.
The first operation mode H1, the second operation mode H2, the third operation mode H3, the 4th of five level topology units 200
The working condition of operation mode H4 and each switching device in the 5th operation mode H5 is as follows:
First operation mode H1: first switch device Q1, third switching device Q3, the 4th switching device Q4, the 6th switch
Device Q6, the 9th switching device Q9, the tenth switching device Q10 conducting, the cut-off of other switching devices.First operation mode H1 etc.
It is as shown in Figure 2 to imitate circuit.I.e. in the present embodiment, exchange end AC passes through the 9th switching device Q9, the tenth switching device Q10, the 9th
Diode D9, the tenth diode D10, the 11st diode D11, the 12nd diode D12 are connect with bus midpoint M1, in continuous
Stream mode.The voltage for exchanging end AC is equal with the voltage of bus midpoint M1.
Second operation mode H2: first switch device Q1, third switching device Q3, the 4th switching device Q4, the 6th switch
Device Q6, the 7th switching device Q7, the tenth switching device Q10 conducting, the cut-off of other switching devices.Second operation mode H2 etc.
Effect circuit diagram is as shown in figure 3, at this point, direct current anode DC+ is mentioned by first diode D1, the 7th switching device Q7 to exchange end AC
For electric current.Or exchange end AC provides electric current to direct current anode DC+ by the 7th diode D7 and first switch device Q1；Simultaneously
Direct current anode DC+ is charged by first diode D1, third switching device Q3 and the first inductance L1 to third capacitor C3 or the
Three capacitor C3 provide electric current to DC side by the first inductance L1, third diode D3 and first switch device Q1.And at this
In a operation mode, first capacitor C1 gives third capacitor C3 charging, therefore, final first capacitor C1 and the both ends third capacitor C3
Voltage is equal.I.e. at the second operation mode H2, first capacitor C1 and third capacitor C3 are in parallel, and the voltage of exchange end AC is equal to the
The voltage of one capacitor C1 and the both ends third capacitor C3.
Third operation mode H3: second switch device Q2, the 4th switching device Q4, the 6th switching device Q6, the 7th switch
Device Q7 conducting, the cut-off of other switching devices.The equivalent circuit diagram of third operation mode H3 is as shown in Figure 4.Third connecting pin M3
Current potential be lifted to the sum of first capacitor C1 and third capacitor C3 both end voltage, voltage is using bus midpoint M1 as reference point.I.e.
When working in third operation mode H3, twice of the voltage that the voltage for exchanging end AC is direct current anode DC+.In this process
In, direct current anode DC+ provides electric current to exchange end AC by second switch device Q2, third capacitor C3, the 7th switching device Q7.
Or the exchange end end AC provides electric current to direct current anode DC+ by the 7th diode D7, third capacitor C3 and the second diode D2.
4th operation mode H4: first switch device Q1, third switching device Q3, the 4th switching device Q4, the 6th switch
Device Q6, the 8th switching device Q8, the 9th switching device Q9 conducting, the cut-off of other switching devices.4th operation mode H4 etc.
It is as shown in Figure 5 to imitate circuit diagram.In this process, exchange end AC gives direct current negative terminal by the 6th diode D6 and the 8th switching tube
DC- provides electric current.Or direct current negative terminal DC- provides electric current to exchange end AC by the 8th diode D8 and the 6th switching tube.Together
Shi Zhiliu negative terminal DC- is by the 6th diode D6, the 4th switching tube and the first inductance L1 to the 4th capacitor C4 charging or the 4th
Capacitor C4 provides electric current to DC side by the first inductance L1, the 4th diode D4 and the 6th switching tube.I.e. when work is the 4th
When operation mode H4, the voltage for exchanging end AC is equal with direct current negative terminal DC-.
5th operation mode H5: first switch device Q1, third switching device Q3, the 5th switching device Q5, the 8th switch
Device Q8 conducting, the cut-off of other switching devices.The equivalent circuit of 5th operation mode H5 is as shown in Figure 6.In this process, with
Bus midpoint M1 is reference point, the current potential of the 4th connecting pin M4 be pulled down to the second capacitor C2 and the 4th capacitor C4 both end voltage it
With.I.e. when work is in the 5th operation mode H5, the voltage of exchange end AC is twice of direct current negative terminal DC- voltage.Specifically, it hands over
The polarity for flowing the voltage of end AC is identical as the voltage of direct current negative terminal DC-, and the absolute value of voltage is the exhausted of direct current negative terminal DC- voltage
To twice of value.Exchange end AC gives direct current negative terminal DC- by the 8th switching device Q8, the 4th capacitor C4, the 5th switching device Q5
Electric current is provided.Or direct current negative terminal DC- is mentioned by the 5th diode D5, the 4th capacitor C4, the 8th diode D8 to exchange end AC
For electric current.
It should be noted that the reference point of all voltage is all bus midpoint M1 in the present embodiment.
Fig. 7 working sequence of each switching device and exchange end AC when being five level topology units 200 work of an embodiment
Waveform diagram.In Fig. 7, first switch device Q1, second switch device Q2, third switching device Q3, the 4th switching device Q4,
Five switching device Q5, the 6th switching device Q6, the 7th switching device Q7, the 8th switching device Q8, the 9th switching device Q9, the tenth
Switching device Q10 and the abscissa for exchanging the respective timing diagram of end AC are identical time shaft.Ordinate is voltage value.Five
In one duty cycle of level topology unit 200, five level topology units 200 successively work in the first operation mode H1,
Two operation mode H2, third operation mode H3, the second operation mode H2, the first operation mode H1, the 4th operation mode H4, the 5th
Operation mode H5, the 4th operation mode H4 and the first operation mode H1, so that exchange end AC exports five level alternating voltages.Example
Such as, in the timing waveform of exchange end AC, the switching between 5 operation modes has been respectively corresponded.For another example, in first switch device
In the working timing figure of part Q1, high level represents first switch device Q1 conducting, and low level represents first switch device Q1 cut-off.
The timing diagram of other switching devices is similar.Therefore, in Fig. 7, under an operation mode, each switching device can be corresponded to
Working condition.
The alternating current of above-mentioned five level topology unit 200, exchange end AC output is sine wave.When work is in the first Working mould
When state H1, the voltage of exchange end AC is zero.When working in the second operation mode H2, the voltage and direct current anode DC of end AC are exchanged
+ voltage it is equal.When working in third operation mode H3, twice of the voltage that the voltage for exchanging end AC is direct current anode DC+.
When work is in the 4th operation mode H4, the voltage for exchanging end AC is equal with direct current negative terminal DC-.When work is in the 5th operation mode
When H5, the voltage of exchange end AC is twice of direct current negative terminal DC- voltage.Therefore, certain in the DC voltage of DC power supply 100
When, the maximum amplitude for exchanging the alternating current of end AC is twice of DC voltage.That is, in the direct current of DC power supply 100
The amplitude of one timing of pressure, the alternating current of exchange end AC output is higher, and the voltage effective value of alternating current is higher.In equal-wattage grade
Under, since its exchange higher then its alternating current of side voltage is smaller.In this way, five level topology unit high conversion efficiencies, and be lost
It is small.Therefore, under equal-wattage grade, cost is relatively low for five level topology units.In addition, in loading demand compared with high alternating voltage
When, since alternating current is small, the isolating transformer of AC/DC convertor exchange side can be reduced and exchange the cost of cable, thus
The cost of reduction system.
In addition, above-mentioned five level topology unit 200 has lesser current cycle path and lower switching tube stress.Example
Such as.First switch device Q1 and the 6th switching device Q6 and antiparallel diode are without switching loss.Second switch device Q2,
Three switching device Q3, the 4th switching device Q4, the 5th switching device Q5, the 7th switching device Q7, the 8th switching device Q8, the 9th
The voltage stress of switching device Q9, the tenth switching device Q10 and their diodes in parallel are only the half of busbar voltage.On
Five level topology units 200 are stated, the total losses and corresponding three of its switching tube under certain busbar voltage and certain output electric current
The total losses of the switching tube of level topology unit are almost the same.But since under identical busbar voltage, above-mentioned five level topology is single
200 output voltage that can satisfy of member is twice of three-level topology unit, and therefore, above-mentioned five level topology unit 200 can be with
It reduces it and exchanges side cost, for example, reducing the cost of its ac step-up transformer and cable.Because above-mentioned five under certain power
The switching tube total losses of level topology unit 200 are the half of traditional tri-level switch pipe total losses, and therefore, above-mentioned five level is opened up
The loss of device can be reduced by flutterring unit 200, to extend the service life.
Please continue to refer to Fig. 1, in the present embodiment, five level topology units 200 further include the first inductance L1.Second connection end
M2 is connect by the first inductance L1 with the first connecting pin M1.First inductance L1 is for limiting third capacitor C3's and the 4th capacitor C4
Charging current, to play a protective role.
It should be noted that the position in circuit the first inductance L1 and quantity are not limited to this, as long as can be limited
The charging and discharging currents change rate of three capacitor C3 and the 4th capacitor C4.
Fig. 8 is the circuit diagram of five level topology units 300 of another embodiment.As shown in figure 8, in an embodiment,
Five level topology units 300 further include the 13rd diode D13 and the 14th diode D14.The anode of 13rd diode D13
It is connect with the first connecting pin M1, the cathode of the 13rd diode D13 and the public affairs of second switch device Q2 and third switching device Q3
Connecting pin connection altogether.That is the cathode of the 13rd diode D13 is connect with the 5th connecting pin M5.The cathode of 14th diode D14
It is connect with the first connecting pin M1, the anode of the 14th diode D14 and the public affairs of the 4th switching device Q4 and the 5th switching device Q5
Connecting pin connection altogether.That is the anode of the 14th diode D14 is connect with the 6th connecting pin M6.In this way, five level topology units 300
In second switch device Q2, third switching device Q3, the 4th switching device Q4 and the 5th switching device Q5 can be used it is existing
I type three-level structure package module encapsulation.It can reduce in this way and do encapsulation bring cost pressure again, reduce five level
The packaging cost of topology unit 300, to reduce the cost of system and improve its reliability and versatility.
Fig. 9 is the circuit diagram of five level topology units 800 of another embodiment.9th switching device Q9 is opened with the tenth
Device Q10 inverse parallel is closed, a public connecting end and the first connecting pin M1 of the 9th switching device Q9 and the tenth switching device Q10 connect
It connects, another public connecting end is connect with exchange end AC.In this way, the 7th switching device Q7, the tenth switching device Q10, the 9th switch
The encapsulation of T-type three-level structure also can be used in device Q9, the 8th switching device Q8, to reduce packaging cost, increases its reliability
And versatility, and reduce packaging cost.
A kind of five level AC/DC convertors, for the direct current of DC power supply 100 to be converted to alternating current.Five level
Converter includes five level topology units of control unit and any of the above-described embodiment.Control unit is for controlling five level topology
The on state or off state of each switching device in unit, so that exchange end AC output AC voltage.In the present embodiment, five
All switching devices of level topology unit are switching tube.
The direct current of DC power supply 100 is converted into exchange electricity output or will handed over by above-mentioned five level AC/DC convertor
The alternating current of stream side is converted to direct current electricity output.Within a duty cycle of five level topology units, five level topology units
It successively works in the first operation mode H1, the second operation mode H2, third operation mode H3, the second operation mode H2, the first work
Make mode H1, the 4th operation mode H4, the 5th operation mode H5, the 4th operation mode H4 and the first operation mode H1.I.e. five electricity
The alternating current of the exchange end AC of flat topology unit is sine wave.When working in the first operation mode H1, the voltage of end AC is exchanged
It is zero.When work is in the second operation mode H2, the voltage for exchanging end AC is equal with the voltage of direct current anode DC+.When work exists
When third operation mode H3, twice of the voltage that the voltage of exchange end AC is direct current anode DC+.When work is in the 4th operation mode
When H4, the voltage for exchanging end AC is equal with direct current negative terminal DC-.When working in the 5th operation mode H5, the voltage of end AC is exchanged
It is twice of direct current negative terminal DC- voltage.Therefore, in one timing of the DC voltage of DC power supply 100, the alternating current of end AC is exchanged
Amplitude is twice of DC voltage.That is, exchanging the alternating current of end AC in one timing of DC voltage of DC power supply 100
Amplitude it is higher, the voltage effective value of alternating current is higher.Under equal-wattage grade, since it exchanges higher then its friendship of side voltage
Galvanic electricity stream is smaller.In this way, five level topology unit high conversion efficiencies, and be lost small.Therefore, under equal-wattage grade, five electricity
Cost is relatively low for flat topology unit.In addition, when loading demand is compared with high alternating voltage, since alternating current is small, friendship can be reduced
DC converter exchanges the isolating transformer of side and exchanges the cost of side line cable, to reduce the cost of system.
In the present embodiment, control unit is separately connected with each switching device, and control unit is that each switching device provides respectively
Driving signal.Each switching device on or off under corresponding driving signal.Therefore, control unit is controlled by driving signal
The working sequence of each switching device, so that the output of five level topology units meets the alternating current of default timing.
The control signal of control unit includes first voltage signal, second voltage signal and tertiary voltage signal；Control is single
Member by using the voltage value of first voltage signal and second voltage signal synchronization comparison result as first switch device
Part, second switch device, third switching device, the 4th switching device, the 5th switching device and the 6th switching device driving letter
Number.
Control unit by by the voltage value of first voltage signal and tertiary voltage signal synchronization comparison result
Driving signal as the 7th switching device, the 8th switching device, the 9th switching device, the tenth switching device.
Figure 10 is each voltage signal in five level AC/DC convertor of an embodiment, each switching device and the work for exchanging end AC
Make timing diagram.As shown in figure 9, first voltage signal is sine wave in the present embodiment；Second voltage signal is triangular wave；Third
Voltage signal is triangular wave.For example, first voltage signal is modulating wave C.Second voltage signal is the first triangular wave, i.e. carrier wave A,
Tertiary voltage signal is the second triangular wave, i.e. carrier wave B.It is similar with Fig. 7, in Fig. 9, the abscissa of carrier wave A, carrier wave B and modulating wave C
It is identical time shaft, ordinate is voltage value.In synchronization, the size of the voltage value of carrier wave A and modulating wave C is determined
The on or off of corresponding switching device.Carrier wave A and carrier wave B can have identical frequency and amplitude, can also have difference
Frequency and amplitude.The generation with regard to the driving signal of each switching device is introduced respectively below.
The driving signal of first switch tube Q1 is carried out by modulating wave C and carrier wave A than generating.When the voltage value of modulating wave C is small
First switch tube Q1 is connected when the voltage value of carrier wave A, otherwise cut-off.
The driving signal of second switch Q2 is compared generation with carrier wave A by modulating wave C.When the voltage value of modulating wave C
Second switch Q2 is connected when voltage value greater than carrier wave A, otherwise cut-off.
The driving signal of third switching tube Q3 is compared generation with carrier wave A by modulating wave C.When the voltage value of modulating wave C
Third switching tube Q3 is connected when voltage value less than carrier wave A, otherwise cut-off；
The driving signal of 4th switching tube Q4 is compared generation with carrier wave A by the backward-wave of modulating wave C.As modulating wave C
Backward-wave (i.e. voltage value does not consider polarity) be less than carrier wave A voltage value when the 4th switching tube Q4 be connected, otherwise cut-off.
The driving signal of 5th switching tube Q5 is compared generation with carrier wave A by the backward-wave of modulating wave C.As modulating wave C
Backward-wave be greater than carrier wave A voltage value when the 5th switching tube Q5 be connected, otherwise cut-off.
The driving signal of 6th switching tube Q6 is compared generation with carrier wave A by the backward-wave of modulating wave C.As modulating wave C
Backward-wave be less than carrier wave A voltage value when the 6th switching tube Q6 be connected, otherwise cut-off.
The driving signal of 7th switching tube Q7 is compared generation with carrier wave B by modulating wave C.When the voltage value of modulating wave C
The 7th switching tube Q7 is connected when voltage value greater than carrier wave B, otherwise cut-off.
The driving signal of 8th switching tube Q8 is compared generation with carrier wave B by the backward-wave of modulating wave C.As modulating wave C
Backward-wave be greater than carrier wave B voltage value when the 8th switching tube Q8 be connected, otherwise cut-off.
The driving signal of 9th switching tube Q9 is compared generation with carrier wave B by modulating wave C.When modulating wave C is in positive half cycle
When, when modulating wave C is less than carrier wave B, the 9th switching tube Q9 is connected, otherwise cut-off；When modulating wave C is in negative half period, work as modulating wave
When the backward-wave of C is less than the peak value of carrier wave B, the 9th switching tube Q9 conducting, on the contrary cut-off；
The driving signal of tenth switching tube Q10 is compared generation with carrier wave B by the backward-wave of modulating wave C.As modulating wave C
In negative half period, when the backward-wave of modulating wave C is less than carrier wave B, the tenth switching tube (Q10) is connected, otherwise cut-off；As modulating wave C
In positive half cycle, when modulating wave C is less than the peak value of carrier wave B, the conducting of the tenth switching tube (Q10), on the contrary cut-off
As above-mentioned, within a duty cycle of five level topology units 200, five level topology units 200 successively work
The first operation mode H1, the second operation mode H2, third operation mode H3, the second operation mode H2, the first operation mode H1,
4th operation mode H4, the 5th operation mode H5, the 4th operation mode H4 and the first operation mode H1, so that exchange end AC is handed over
Galvanic electricity pressure.Therefore, within each operation mode corresponding period, the on or off of each switching tube is correspondingly controlled, it can be defeated
Meet expected ac signal out.
In one embodiment, five level AC/DC convertors further include exchange side filter unit.One end of ac filter unit
It being connect with the exchange end AC of five level topology units, ac filter unit is used to improve the waveform of the alternating current of exchange end AC, with
So that the waveform of the alternating current of exchange end AC is more smooth.In addition, exchange side filter unit can also filter out noise.In general, handing over
Stream side filter unit is made of capacitor and inductance.
Five level AC/DC convertors are illustrated with regard to common several examples below.
Figure 11 is the schematic diagram of the single-phase five level AC/DC convertor 400 of an embodiment.The five level ac-dc conversion
The quantity of five level topology units is two in device 400, respectively the one or five level topology unit 410 and the two or five level topology
Unit 420.The direct current anode DC+ of two five level topology units links together, and the direct current of two five level topology units is negative
End DC- links together, and the first connecting pin M1 of two five level topology units links together.One or five level topology unit
Phase difference between the alternating current of 410 outputs and the alternating current of the two or five level topology unit 420 is 180 °, to meet single-phase electricity
Application demand.
Specifically, for generate 410 driving signal of the one or five level topology unit modulating wave phase with for generating
180 ° of the phase phase difference of the modulating wave of two or five level topology unit, 420 driving signal, so that the one or five level topology unit
Phase difference between 410 alternating current and the alternating current of the two or five level topology unit 420 is 180 °.
As shown in Figure 10, five level AC/DC convertors 400 further include exchange side filter unit 430.It is single to exchange side filtering
Member 430 includes the second inductance La, third inductance Lb and the 5th capacitor Cg.One end of second inductance La and the one or five level topology are single
The exchange end AC connection of member 410.One end of third inductance Lb is connect with the exchange end AC of the two or five level topology unit 420, the
The other end of two inductance La is connect by the first AC load Vg with the other end of third inductance Lb.5th capacitor Cg is handed in first
Current load Vg is in parallel.Therefore, exchange side filter unit 430 can make the waveform more light of the alternating current at the first AC load Vg
It is sliding.
Figure 12 is the schematic diagram of the phase three-wire three five-level converter 500 of an embodiment.Five level translation of phase three-wire three
In device 500, the quantity of five level topology units is three, respectively the three or five level topology unit 510, the four or five level topology
Unit 520 and the five or five level topology unit 530.The direct current anode DC+ of three five level topology units links together, and three
The direct current negative terminal DC- of five level topology units links together, and the first connecting pin M1 of three five level topology units is connected to
Together.Three or five level topology unit 510, the four or five level topology unit 520 are exchanged with the five or five level topology unit 530
The phase of electricity successively differs 120 °, to meet three-phase electricity application demand.
Specifically, for generating the phase of the modulating wave of the one or five level topology unit driving signal, for generating second
The phase of the modulating wave of five level topology unit driving signals and tune for generating the two or five level topology unit driving signal
120 ° are successively differed between the phase of wave processed, so that alternating current, the two or five level of the output of the one or five level topology unit are opened up
The phase difference flutterred between the alternating current of unit output and the alternating current of the three or five level topology unit 510 output is 120 °.
In the present embodiment, five level AC/DC convertors 500 further include exchange side filter unit 540.It is single to exchange side filtering
Member 540 includes the 4th inductance La, the 5th inductance Lb, the 6th inductance Lc, the 6th capacitor Ca, the 7th capacitor Cb and the 8th capacitor Cc.
One end of 4th inductance La is connect with the exchange end AC of the three or five level topology unit 510, the other end difference of the 4th inductance La
It is connect with one end of an electrode of the 6th capacitor Ca and the second AC load VGa.One end of 5th inductance Lb and the four or five electricity
The exchange end AC connection of flat topology unit 520, the other end of the 5th inductance Lb respectively with an electrode of the 7th capacitor Cb and
One end of three AC load VGb connects.One end of 6th inductance Lc connects with the end AC that exchanges of the five or five level topology unit 530
It connects, the other end of the 6th inductance Lc is connect with one end of an electrode of the 8th capacitor Cc and the 4th AC load VGc respectively.The
The other end of the other end of two AC load VGa, the other end of third AC load VGb and the 4th AC load VGc connects.The
Another electrode of another electrode of six capacitor Ca, another electrode of the 7th capacitor Cb and the 8th capacitor Cc connects.Therefore, side is exchanged
Filter unit 540 can make the waveform of the alternating current at each AC load more smooth.
Figure 13 is the schematic diagram of the five level AC/DC convertor 600 of phase three-wire three of another embodiment.In the present embodiment, five
The circuit structure of level AC/DC convertor 600 can be with reference to the schematic diagram of the converter in Figure 11.Difference is that exchange side is filtered
The 6th capacitor Ca, the 7th capacitor Cb of wave unit and the public connecting end and bus midpoint M1 of the 8th capacitor Cc link together；
The public connecting end and the second AC load VGa, third AC load of 6th capacitor Ca, the 7th capacitor Cb and the 8th capacitor Cc
The public connecting end of VGb and the 4th AC load VGc link together.
Figure 14 is the schematic diagram of the three-phase and four-line five-level converter 700 of an embodiment.In the present embodiment, five level translations
Device 700 is also used in industry.The circuit structure of five-level converter 700 in the present embodiment can refer to the friendship of five level in Figure 11
The circuit structure of DC converter 700.Difference is, in the present embodiment, exchanges the 6th capacitor Ca, the 7th electricity of side filter unit
The public connecting end for holding Cb and the 8th capacitor Cc links together with bus midpoint M1；6th capacitor Ca, the 7th capacitor Cb and
The public connecting end of eight capacitor Cc is public with the second AC load VGa, third AC load VGb and the 4th AC load VGc's
Connecting pin links together.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it cannot be understood as the limitations to utility model patent range.It should be pointed out that for the common skill of this field
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (10)
1. a kind of five level topology units characterized by comprising first switch device, second switch device, third derailing switch
Part, the 4th switching device, the 5th switching device, the 6th switching device, the 7th switching device, the 8th switching device, the 9th switch
Device, the tenth switching device, first capacitor, the second capacitor, third capacitor and the 4th capacitor；
The five level topology unit is connect with DC power supply；It is in parallel between the direct current anode of the DC power supply and direct current negative terminal
There are the first branch, second branch and third branch；
Wherein, the first branch includes the connected first capacitor and second capacitor, the first capacitor and described
Circuit midpoint between second capacitor is as the first connecting pin；The electrode that the first capacitor is not connected with first connecting pin connects
The direct current anode of DC power supply is connect, the electrode that second capacitor is not connected with first connecting pin connects the DC power supply
Direct current negative terminal；
The second branch includes the sequentially connected second switch device, the third switching device, the 4th switch
Device and the 5th switching device, the second switch device be not connected with the third switching device one end and the direct current
Anode connection, one end that the 5th switching device is not connected with the 4th switching device is connect with the direct current negative terminal；
The third branch includes the sequentially connected first switch device, the 7th switching device, the 8th switch
Device and the 6th switching device, one end connection that the first switch device is not connected with the 7th switching device are described straight
Anode is flowed, one end that the 6th switching device is not connected with the 8th switching device connects the direct current negative terminal；Described 7th
Switching device is used as with the public connecting end of the 8th switching device and exchanges end；
9th switching device and the tenth switching device are set between first connecting pin and the exchange end
On circuit；
Public connecting end between the first switch device and the 7th switching device by the third capacitor with it is described
Second switch device is connect with the public connecting end of the third switching device；6th switching device and the 8th switch
The public connecting end of device passes through the public company of the 4th capacitor and the 4th switching device and the 5th switching device
Connect end connection；
The five level topology unit operation mode includes the first operation mode, the second operation mode, third operation mode, the 4th
Operation mode and the 5th operation mode；Within a duty cycle of the five level topology unit, the five level topology
Unit successively works in first operation mode, second operation mode, the third operation mode, second work
Mode, first operation mode, the 4th operation mode, the 5th operation mode, the 4th operation mode and institute
The first operation mode is stated, so that exchange end output AC voltage；When five level topology unit work is described the
When one operation mode, the voltage at the exchange end is zero；When the five level topology unit work in the second operation mode, institute
The voltage for stating five level topology units exchange end is equal with the voltage of the direct current anode；When the five level topology unit works
In the third operation mode, the voltage at the exchange end is twice of the voltage of the direct current anode；When five level
Topology unit works in four operation mode, and the voltage at the exchange end is equal with the direct current negative terminal；When described five
Level topology unit works in five operation mode, and the voltage at the exchange end is the two of the direct current negative terminal voltage
Times.
2. five level topology unit according to claim 1, which is characterized in that
The first switch device, third switching device, the 4th switching device, the 6th switching device, the 9th switching device, the tenth
Switch device conductive, other switching devices cut-off, so that five level topology unit work is in the first operation mode；
First switch device, third switching device, the 4th switching device, the 6th switching device, the 7th switching device, the tenth switch
Break-over of device, other switching devices cut-off, so that five level topology unit work is in the second operation mode；
Second switch device, the 4th switching device, the 6th switching device, the 7th switch device conductive, the cut-off of other switching devices,
So that the five level topology unit work is in third operation mode；
First switch device, third switching device, the 4th switching device, the 6th switching device, the 8th switching device, the 9th switch
Break-over of device, other switching devices cut-off, so that five level topology unit work is in the 4th operation mode；
First switch device, third switching device, the 5th switching device, the 8th switch device conductive, the cut-off of other switching devices,
So that the five level topology unit work is in the 5th operation mode.
3. five level topology unit according to claim 1, which is characterized in that further include the first inductance；The third is opened
The public connecting end for closing device and the 4th switching device is connect by the first inductance with the first connecting pin.
4. five level topology unit according to claim 1, which is characterized in that further include:
The anode of 13rd diode and the 14th diode, the 13rd diode is connect with first connecting pin, institute
The cathode for stating the 13rd diode is connect with the public connecting end of the second switch device and the third switching device；It is described
The cathode of 14th diode is connect with first connecting pin, the anode and the 4th derailing switch of the 14th diode
Part is connect with the public connecting end of the 5th switching device.
5. five level topology unit according to claim 1, which is characterized in that
9th switching device is connected with the tenth switching device, the 9th switching device connection first connection
End, the tenth switching device connect the exchange end.
6. five level topology unit according to claim 1, which is characterized in that the 9th switching device and the described tenth
Switching device inverse parallel, the 9th switching device are connect with a public connecting end of the tenth switching device with described first
End connection, another public connecting end are connect with the exchange end.
7. a kind of five level AC/DC convertors characterized by comprising
Five level topology unit as claimed in any one of claims 1 to 6；
Control unit, for controlling the on state or off state of each switching device in the five level topology unit, so that
The converter work is in corresponding operation mode.
8. five level AC/DC convertor according to claim 7, which is characterized in that described control unit described is opened with each
Device is closed to be separately connected；The control signal of described control unit includes first voltage signal, second voltage signal and tertiary voltage
Signal；Described control unit by by the voltage value of the first voltage signal and the second voltage signal in synchronization
Comparison result is as the first switch device, the second switch device, the third switching device, the 4th derailing switch
The driving signal of part, the 5th switching device and the 6th switching device；
Described control unit by by the voltage value of the first voltage signal and the tertiary voltage signal in synchronization
Comparison result is as the 7th switching device, the 8th switching device, the 9th switching device, the tenth derailing switch
The driving signal of part；Each switching device on or off under corresponding driving signal.
9. five level AC/DC convertor according to claim 8, which is characterized in that the waveform of the first voltage signal
For sine wave；The waveform of the second voltage signal and the tertiary voltage signal distinguishes triangular wave.
10. five level AC/DC convertor according to claim 7, which is characterized in that further include: the filtering of exchange side is single
Member, one end of the ac filter unit are connect with the exchange end of the five level topology unit, and the ac filter unit is used
In the waveform for the alternating current for improving the exchange end.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109921676A (en) * | 2019-03-04 | 2019-06-21 | 易事特集团股份有限公司 | Converter topology unit and converter device |
| CN110880864A (en) * | 2019-12-13 | 2020-03-13 | 三峡大学 | Single-phase five-level power factor correction circuit based on hybrid H bridge |
| CN111030440A (en) * | 2019-12-13 | 2020-04-17 | 三峡大学 | Single-phase two-tube five-level rectifier based on hybrid H bridge |
| CN111030441A (en) * | 2019-12-13 | 2020-04-17 | 三峡大学 | Single-phase power factor correction circuit based on three-tube five-level topology |
| CN111082680A (en) * | 2019-12-13 | 2020-04-28 | 三峡大学 | Single-phase five-level rectifier based on T-shaped structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109921676A (en) * | 2019-03-04 | 2019-06-21 | 易事特集团股份有限公司 | Converter topology unit and converter device |
| CN110880864A (en) * | 2019-12-13 | 2020-03-13 | 三峡大学 | Single-phase five-level power factor correction circuit based on hybrid H bridge |
| CN111030440A (en) * | 2019-12-13 | 2020-04-17 | 三峡大学 | Single-phase two-tube five-level rectifier based on hybrid H bridge |
| CN111030441A (en) * | 2019-12-13 | 2020-04-17 | 三峡大学 | Single-phase power factor correction circuit based on three-tube five-level topology |
| CN111082680A (en) * | 2019-12-13 | 2020-04-28 | 三峡大学 | Single-phase five-level rectifier based on T-shaped structure |
| CN111082680B (en) * | 2019-12-13 | 2021-05-04 | 三峡大学 | Single-phase five-level rectifier based on T-shaped structure |
| CN111030441B (en) * | 2019-12-13 | 2021-06-04 | 三峡大学 | Single-phase power factor correction circuit based on three-tube five-level topology |
| CN110880864B (en) * | 2019-12-13 | 2021-07-06 | 三峡大学 | Single-phase five-level power factor correction circuit based on hybrid H bridge |
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