CN207460027U - Isolation type bidirectional DC/AC power supplys - Google Patents
Isolation type bidirectional DC/AC power supplys Download PDFInfo
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- CN207460027U CN207460027U CN201721501059.4U CN201721501059U CN207460027U CN 207460027 U CN207460027 U CN 207460027U CN 201721501059 U CN201721501059 U CN 201721501059U CN 207460027 U CN207460027 U CN 207460027U
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Abstract
The utility model is related to isolation type bidirectional DC/AC power supplys, including two-way DC/AC converters, isolation type bidirectional DC/DC converters, the exchange side joint three-phase alternating-current supply of its two-way DC/AC converter, the DC side of two-way DC/AC converters is equipped with double-bus, i.e. the positive direct-current busbar of BUS+ to N, the negative dc bus of N to BUS；Two-way DC/AC converters are stable and balance positive direct-current busbar and negative dc bus；Isolation type bidirectional DC/DC converters include first, second two-way DC/DC converter units, first two-way DC/DC converter units high-pressure modular is connected with the positive direct-current busbar of two-way DC/AC converters DC side, second two-way DC/DC converter units high-pressure modular is connected with the negative dc bus of two-way DC/AC converters DC side, and the low-voltage module of the first two-way DC/DC converter units and the low-voltage module of the second two-way DC/DC converter units are in parallel in low-pressure side.
Description
Technical field
The utility model is related to a kind of power supplys, and in particular to a kind of isolation type bidirectional DC/AC power supplys.
Background technology
At present in power supply relevant industries, the application of two-way isolation DC/AC power supplys is very more.Such as Battery formation power supply industry
Often use the two-way isolation DCAC power supplys that a kind of 10~350Vdc of direct current is converted to three-phase alternating current 380Vac, common topology
Structure is as shown in Figure 1.The two-way DC/AC converters DC side of this topological structure generates a DC power supply, and voltage range is big
It causes as 700~850V, two-way isolation DC/DC converters are connected to two-way DC/AC converters DC side and carry out electric energy two-way changing.
The shortcomings that such topological structure is that the high-pressure side of two-way DC/DC converters needs to use the IGBT or metal-oxide-semiconductor of 1200V, 1200V's
IGBT or metal-oxide-semiconductor compare the IGBT or metal-oxide-semiconductor of 600V or 650V, switching loss higher, so as to cause two-way DC/DC converters
Switching frequency is relatively low, and the cost of system is higher, and volume is larger, and transfer efficiency is relatively low.
Utility model content
In order to overcome drawbacks described above, the utility model provides a kind of low-pressure side crisscross parallel, the isolated form of high-pressure side series connection
The isolation type bidirectional DC/AC power supplys that two-way DC/DC converters and two-way DC/AC converters with positive and negative dc bus are formed.Its
In, two-way DC/AC converters complete electric energy from exchange side to DC side (positive direct-current busbar, negative dc bus) two-way changing,
Stablize the voltage with balanced positive direct-current busbar, negative dc bus, while complete the power factor emendation function of exchange side；Isolated form
Two-way DC/DC converters then complete electric energy from two-way DC/AC converters DC side to the two-way of the low-pressure side of two-way DC/AC power supplys
Conversion, and pass through isolating transformer and complete electrical isolation features.
The technical solution of the utility model is the isolation type bidirectional DC/AC power supplys, including two-way DC/AC converters
(100), isolation type bidirectional DC/DC converters (200), are characterized in that, the two-way DC/AC converters (100) it is straight
It flows side and connects isolation type bidirectional DC/DC converters (200) high-pressure side, the DC side of the two-way DC/AC converters (100)
Equipped with double-bus, i.e. the positive direct-current busbar of BUS+ to N, the negative dc bus of N to BUS-, the two-way DC/AC converters (100)
Stablize and balance the positive direct-current busbar and negative dc bus.
Preferably, the isolation type bidirectional DC/DC converters (200) include the first two-way DC/DC converter units (30) and
Second two-way DC/DC converter units (40), the first two-way DC/DC converter units (30) become with the described second two-way DC/DC
Unit (40) is changed with identical topological structure, topological structure includes sequentially connected low-voltage module (31), isolating transformer
(32) and high-pressure modular (33).
Preferably, the positive terminal of the described first two-way DC/DC converter units (30) high-pressure modular becomes with the two-way DC/AC
The BUS+ ends of the positive direct-current busbar of parallel operation (100) DC side are connected, first two-way DC/DC converter units (30) high-pressure modular
Negative pole end be connected with the N-terminal of the positive direct-current busbar of two-way DC/AC converters (100) DC side, the second two-way DC/
The N of the positive terminal of DC converter units (40) high-pressure modular and the negative dc bus of two-way DC/AC converters (100) DC side
End is connected, negative pole end and the two-way DC/AC converters of second two-way DC/DC converter units (40) high-pressure modular
(100) the BUS- ends of the negative dc bus of DC side are connected, the low-voltage module of the first two-way DC/DC converter units (30)
(31) with the low-voltage module (31) of the described second two-way DC/DC converter units (40) the two-way DC/AC power supplys low-pressure side
It is in parallel.
Preferably, the high pressure of the described first two-way DC/DC converter units (30) and the second two-way DC/DC converter units (40)
The pressure voltage of selected switching tube is less than the positive direct-current bus voltage value and the summation of negative d-c bus voltage value in module.
Preferably, the switching tube is realized by metal-oxide-semiconductor or by asymmetric one diode reality of IGBT pipes inverse parallel
It is existing；The switching tube is equipped with control terminal, positive terminal, negative pole end.
Preferably, the isolation type bidirectional DC/DC converters tool is there are one closed loop controller (500), to described first pair
It is controlled to DC/DC converter units (30) and the second two-way DC/DC converter units (40)；
Preferably, there are one outer voltages (501) for tool in the closed loop controller (500)；Outer voltage (501) tool
There are desired value V_low_ref and the feedback quantity V_low of the isolation type bidirectional DC/AC power supply low-pressure side voltages, the error of the two
Measure the output that outer voltage (501) is formed after the outer voltage pi regulator；The closed loop controller (500) has two
A independent current inner loop (502)；The desired value of described two current inner loops (502) is the output of the outer voltage (501),
The feedback quantity of described two current inner loops (502) is single for the first two-way DC/DC converter units (30) and the second two-way DC/DC conversion
The actual current value of first (40) low-pressure side；Two respective margins of error of current inner loop are formed after current inner loop pi regulator closes
Ring is adjusted.
Preferably, the described first two-way DC/DC converter units (30) and the second two-way DC/DC converter units (40)
Each independence and phase differ 180 degree to PWM carrier waves, described two-way so as to be greatly reduced to realize low-pressure side crisscross parallel function
The current ripples of DC/DC converter low-pressure sides.
Compared with prior art, the beneficial effects of the utility model:
Low pressure-resistant IGBT or metal-oxide-semiconductor can be used in the high side switch pipe of the two-way DC/DC converters, so as to described double
To isolation DC/DC power supplys switching frequency can be higher than the switching tube frequency of prior art, such as can accomplish 60kHz and
More than；Control of the two-way DC/DC converters due to being not required to do the positive and negative dc bus in high-pressure side, two-way DC/DC converters
Control become very easily；Since the low-voltage direct side of two-way DC/AC power supplys is using crisscross parallel, there is smaller line
Wave voltage and ripple current；Switch machine frequency is high, small volume, and efficiency is higher.
Description of the drawings
Fig. 1 is the technical solution topological diagram of existing isolation type bidirectional DC/AC power supplys.
Fig. 2 is a kind of topology diagram of isolation type bidirectional DC/AC power supplys of a better embodiment of the utility model.
Fig. 3 is the topology diagram under a better embodiment of two-way DC/DC units in Fig. 2.
Circuit topology figure under Fig. 4 a, Fig. 4 b, Fig. 4 c, Fig. 4 d, five kinds of embodiments that Fig. 4 e are Fig. 3 mesolow modules.
Fig. 5 a, Fig. 5 b are the circuit topology figure under two kinds of embodiments of isolating transformer in Fig. 3.
Fig. 6 a, Fig. 6 b are the circuit topology figure under two kinds of embodiments of Fig. 3 mesohigh modules.
Fig. 7 be Fig. 7 a, Fig. 7 b, Fig. 7 c be Fig. 2 in two-way DC/AC converters three kinds of embodiments under circuit topology
Figure.
Fig. 8 is the closed loop controller under a kind of embodiment of two-way DC/DC converters in Fig. 2FrameFigure.
Fig. 9 is circuit diagram more specific under a kind of embodiment of two-way DC/DC converter units in Fig. 3.
Figure 10 is the circuit diagram of the utility model isolation type bidirectional DC/AC power supplys.
Figure 11 isWhat the closed loop controller of two-way DC/DC converters was realized with programFlow chart.
Specific embodiment
The utility model is described in further detail below in conjunction with attached drawing：
It refers to shown in Fig. 2, in wherein a kind of embodiment, the isolation type bidirectional DC/AC power supplys, including two-way
DC/AC converters (100) and isolation type bidirectional DC/DC converters (200)；The exchange side of the two-way DC/AC converters (100)
Connect three-phase AC grid, the direct current side joint isolation type bidirectional DC/DC converters (200) of the two-way DC/AC converters；It is described double
Double-bus is equipped with to the DC side of DC/AC converters (100), i.e. the positive direct-current busbar of BUS+ to N, the negative direct current of N to BUS- are female
Line, the two-way DC/AC converters are stable and balance the positive direct-current busbar and negative dc bus.
It refers to shown in Fig. 2, in wherein a kind of embodiment, the isolation type bidirectional DC/DC converters (200) include
First two-way DC/DC converter units (30) and the second two-way DC/DC converter units (40), the first two-way DC/DC conversion are single
First (30) with the described second two-way DC/DC converter units (40) there is identical topology to tie.
It refers to shown in Fig. 2, in wherein a kind of embodiment, first two-way DC/DC converter units (30) high pressure
The positive terminal of module (33) is connected with the BUS+ ends of the positive direct-current busbar of two-way DC/AC converters (100) DC side, described
The negative pole end of first two-way DC/DC converter units (30) high-pressure modular (33) and two-way DC/AC converters (100) DC side
The N-terminal of positive direct-current busbar be connected, the positive terminal of second two-way DC/DC converter units (40) high-pressure modular with it is described two-way
The N-terminal of the negative dc bus of DC/AC converters (100) DC side is connected, second two-way DC/DC converter units (40) high pressure
The negative pole end of module is connected with the BUS- ends of the negative dc bus of two-way DC/AC converters (100) DC side, and described first
The low-voltage module (31) of two-way DC/DC converter units (30) and the low-voltage module of the described second two-way DC/DC converter units (40)
(31) it is in parallel in the low-pressure side of the two-way DC/AC power supplys.
In the present embodiment, the first two-way DC/DC converter units (30) and the second two-way DC/DC converter units (40)
The pressure voltage of selected switching tube is less than the positive direct-current bus voltage value and negative d-c bus voltage value total in high-pressure modular
With.
In the present embodiment, the switching tube can be realized by metal-oxide-semiconductor；It in another embodiment, can also be by non-right
One diode of title type IGBT pipes inverse parallel is realized；The switching tube is equipped with control terminal, positive terminal, negative pole end.
Refer to shown in Fig. 3, the topological structures of two-way DC/DC converter units include sequentially connected low-voltage module (31),
Isolating transformer (32) and high-pressure modular (33).
In the present embodiment, the two-way DC/DC converter units low-voltage module (31) includes：Switching tube Q1, switching tube Q2, open
Close pipe Q3With switching tube Q4, filter inductance L1With filter capacitor C1；The filter inductance L1One end and filter capacitor C1Anode
It is connected, forms low-pressure side anode；The switching tube Q2Negative pole end, switching tube Q4Negative pole end and filter capacitor C1Negative terminal phase
Even, low-pressure side cathode is formed；The switching tube Q1Positive terminal, switching tube Q3Positive terminal and the filter inductance the other end
It is connected；The switching tube Q1Negative pole end and switching tube Q2Positive terminal be connected, form the first bridge arm of low-voltage module midpoint；It is described
Switching tube Q3Negative pole end and switching tube Q4Positive terminal is connected, and forms the second bridge arm of low-voltage module midpoint；First bridge of low-voltage module
Arm midpoint is connected with low-voltage module the second bridge arm midpoint with the isolating transformer (32) low-voltage side coil.
In the present embodiment, the isolating transformer (32) includes low-pressure side first coil, magnetic core and high-pressure side first coil；
One end of the low-pressure side first coil is connected with (31) the first bridge arm midpoint of low-voltage module, the low-pressure side first coil
The other end be connected with (31) the second bridge arm midpoint of low-voltage module.
In the present embodiment, first two-way DC/DC converter units (30) high-pressure modular (33) includes filter capacitor C11, open
Close pipe Q15, switching tube Q16, switching tube Q17, switching tube Q18With capacitance C10；The filter capacitor C11Anode and described open
Close pipe Q15Positive terminal and the switching tube Q17Positive terminal be connected, form the high-pressure side positive terminal of high-pressure modular, the filter
Ripple capacitance C11Cathode and the switching tube Q16Negative pole end and switching tube Q18Negative pole end connection, form the height of high-pressure modular
Press side negative pole end；The switching tube Q15Negative pole end, switching tube Q16Positive terminal and capacitance C10One end be connected, blocking
Capacitance C10Other end formed high-pressure modular the first bridge arm midpoint；The switching tube Q17Negative pole end and switching tube Q18's
Positive terminal is connected, and forms the second bridge arm midpoint of high-pressure modular (33)；First bridge arm midpoint of the high-pressure modular (33) and institute
The one end for stating the high pressure lateral coil of isolating transformer is connected, and the second bridge arm midpoint of the high-pressure modular (33) isolates change with described
The other end of the high pressure lateral coil of depressor is connected.
It refers to shown in Fig. 4 a, two-way DC/DC converter units low-voltage module (31) circuit topology is current mode full-bridge
Circuit specifically includes：Switching tube Q1, switching tube Q2, switching tube Q3With switching tube Q4, filter inductance L1With filter capacitor C1；It is described
Filter inductance L1One end and filter capacitor C1Anode be connected, formed low-pressure side anode；The switching tube Q2Negative pole end, open
Close pipe Q4Negative pole end and filter capacitor C1Negative terminal be connected, formed low-pressure side cathode；The switching tube Q1Positive terminal, switch
Pipe Q3Positive terminal be connected with the other end of the filter inductance；The switching tube Q1Negative pole end and switching tube Q2Positive terminal
It is connected, forms the first bridge arm of low-voltage module midpoint；The switching tube Q3Negative pole end and switching tube Q4Positive terminal is connected, and forms low pressure
The second bridge arm of module midpoint；Low-voltage module the first bridge arm midpoint isolates transformation with low-voltage module the second bridge arm midpoint with described
Device (32) low-voltage side coil is connected.
It refers to shown in Fig. 4 b, in second of embodiment, two-way DC/DC converter units low-voltage module (31) electricity
Road topology is current mode symmetrical half bridge circuit.
It refers to shown in Fig. 4 c, in the third embodiment, two-way DC/DC converter units low-voltage module (31) electricity
Road topology is current mode push-pull circuit.
It refers to shown in Fig. 4 d, in the first embodiment, two-way DC/DC converter units low-voltage module (31) electricity
Road topology is voltage-type full-bridge circuit.
It refers to shown in Fig. 4 e, in second of embodiment, two-way DC/DC converter units low-voltage module (31) electricity
Road topology is voltage-fed half-bridge circuit.
It refers to shown in Fig. 5 a, in the first embodiment, the isolating transformer (32) is common transformer, specifically
Including low-pressure side first coil, magnetic core and high-pressure side first coil；One end of the low-pressure side first coil and the low pressure molding
(31) first bridge arm midpoint of block is connected, in the other end of the low-pressure side first coil and (31) second bridge arm of low-voltage module
Point is connected.
It refers to shown in Fig. 5 b, in second of embodiment, the isolating transformer (32) is low-voltage coil band center
The transformer of tap.
It refers to shown in Fig. 6 a, in the first embodiment, two-way DC/DC converter units (30) high-pressure modular
(33) it is voltage-type full-bridge topology, specifically includes：Filter capacitor C11, switching tube Q15, switching tube Q16, switching tube Q17, switching tube
Q18With capacitance C10；The filter capacitor C11Anode and the switching tube Q15Positive terminal and the switching tube Q17's
Positive terminal is connected, and forms the high-pressure side positive terminal of high-pressure modular, the filter capacitor C11Cathode and the switching tube Q16It is negative
Extreme and switching tube Q18Negative pole end connection, form the high-pressure side negative pole end of high-pressure modular；The switching tube Q15Negative pole end,
Switching tube Q16Positive terminal and capacitance C10One end be connected, capacitance C10Other end form the of high-pressure modular
One bridge arm midpoint；The switching tube Q17Negative pole end and switching tube Q18Positive terminal be connected, formed high-pressure modular (33) second
Bridge arm midpoint；First bridge arm midpoint of the high-pressure modular (33) and one end phase of the high pressure lateral coil of the isolating transformer
Even, the second bridge arm midpoint of the high-pressure modular (33) is connected with the other end of the high pressure lateral coil of the isolating transformer；
It refers to shown in Fig. 6 b, in second of embodiment, two-way DC/DC converter units (30) high-pressure modular
(33) it is voltage-type symmetrical half bridge topology.
It refers to shown in Fig. 7 a, in the first embodiment, the DC/AC reversible transducers are three-phase diode midpoint
Clamper three-level inverter topology structure, specifically includes：Filter capacitor C15, filter capacitor C16, switching tube Qa1, switching tube Qa2, open
Close pipe Qa3, switching tube Qa4, switching tube Qb1, switching tube Qb2, switching tube Qb3, switching tube Qb4, switching tube Qc1, switching tube Qc2, switch
Pipe Qc3, switching tube Qc4, diode Da1, diode Da2, diode Db1, diode Db2, diode Dc1, diode Dc2, filtered electrical
Feel La1, filter inductance Lb1, filter inductance Lc1, ac filter capacitance Ca1, ac filter capacitance Cb1With ac filter capacitance Cc1；Institute
State switching tube Qa1Positive terminal, switching tube Qb1Positive terminal and switching tube Qc1Positive terminal and filter capacitor C15Positive terminal is connected,
Form BUS+ ends；The switching tube Qa1Negative pole end, switching tube Qa2Positive terminal and diode Da1Cathode connects；The switch
Pipe Qb1Negative pole end, switching tube Qb2Positive terminal and diode Db1Cathode connects；The switching tube Qc1Negative pole end, switching tube
Qc2Positive terminal and diode Dc1 cathode connects；The diode Da1Anode, diode Da2Cathode, diode Db1Anode, two
Pole pipe Db2Cathode, diode Dc1Anode, diode Dc2Cathode, filter capacitor C15Cathode, filter capacitor C16Anode is connected, and is formed
The internal direct current midpoint of three-level inverter；The ac filter capacitance Ca1, ac filter capacitance Cb1With ac filter capacitance Cc1
Star-like connection is done, and forms ac capacitor midpoint；The interior middle point is connected with the ac capacitor midpoint, and it is inverse to form three level
Become inside center line --- the N-terminal of device；The N-terminal can be connected with the neutral conductor of external electrical network, can not also connect；The switching tube Qa2's
Negative pole end, switching tube Qa3Positive terminal and filter inductance La1One end be connected；The switching tube Qb2Negative pole end, switching tube Qb3
Positive terminal and filter inductance Lb1One end be connected；The switching tube Qc2Negative pole end, switching tube Qc3Positive terminal and filtered electrical
Feel Lc1One end be connected；The switching tube Qa3Negative pole end, switching tube Qa4Positive terminal and diode Da2Anode connects；It is described
Switching tube Qb3Negative pole end, switching tube Qb4Positive terminal and diode Db2Anode connects；The switching tube Qc3Negative pole end, open
Close pipe Qc4Positive terminal and diode Dc2Anode connects；The switching tube Qa4Negative pole end, switching tube Qb4Negative pole end and switch
Pipe Qc4Negative pole end and the filter capacitor C16Cathode be connected, form BUS- ends；The filter inductance La1The other end, hand over
Flow filter capacitor Ca1The other end and exchange output control switch (A phases) one end be connected；The filter inductance Lb1It is another
End, ac filter capacitance Cb1The other end and exchange output control switch (B phases) one end be connected；The filter inductance Lc1
The other end, ac filter capacitance Cc1The other end and exchange output control switch (C phases) one end be connected；The exchange is defeated
Go out control switch with external communication power grid to be connected.
It refers to shown in Fig. 7 b, in second of embodiment, the DC/AC reversible transducers are T-shaped three-phase tri-level
Inverter topology.
It refers to shown in Fig. 7 c, in the third embodiment, the DC/AC reversible transducers are two level inverse conversion of three-phase
Device topological structure.
It refers to shown in Fig. 8, in the first embodiment, there are one close the isolation type bidirectional DC/DC converters tool
Ring controller 500, DC/DC converter units two-way to described first and the second two-way DC/DC converter units control；It is described to close
Tool is there are one outer voltage 501 in ring controller, to control the two-way DC/DC converters low-pressure side voltage output；It is described
There are one voltage-target V_low_ref feedbacks corresponding with its of the two-way DC/DC converters low-pressure side for outer voltage tool
V_low is measured, the margin of error of the two forms closed loop adjusting after the outer voltage pi regulator；The closed loop controller has
Two independent current inner loops 502, to control and the balanced first two-way DC/DC converter units and the second two-way DC/DC
The low-pressure side electric current of converter unit；The desired value of described two current inner loops be the outer voltage output, described two electricity
The feedback quantity for flowing inner ring is the actual current of the first and second two-way DC/DC converter units low-pressure sides, and two current inner loops are each
The margin of error formed after current inner loop pi regulator closed loop adjusting.
It refers to shown in Fig. 8, in the first embodiment, the closed-loop control of the isolation type bidirectional DC/DC converters
The carrier wave of first two-way DC/DC converter units described in device and the second two-way DC/DC converter units PWM are independent, and
Phase differs 180 degree, to realize low-pressure side crisscross parallel function, so as to which the two-way DC/DC converters low-pressure side be greatly reduced
Current ripples.
It refers to shown in Fig. 9, the two-way DC/DC converter units are opened up for the circuit that Fig. 4 a, Fig. 5 a and Fig. 6 a are composed
Flutter structure.According to the known technology of field of power electronics, one topology can be selected by Fig. 4 a~Fig. 4 e, it is selected by Fig. 5 a~Fig. 5 b
One topology is selected one topology by Fig. 6 a~Fig. 6 b, is composed the embodiment of another two-way DC/DC converter units.
In the present embodiment, the detailed circuit topological structure of the utility model is converted single by the two-way DC/DC shown in Fig. 9
Three-phase diode neutral-point-clamped three-level inverter topology shown in first topological sum Fig. 7 a is formed, and is please referred to Fig.1 shown in 0.
In the present embodiment, the closed loop controller of the isolation type bidirectional DC/DC converters is real using DSP digitization procedures
Existing, the closed-loop control implement body realizes that flow chart is please referred to Fig.1 shown in 1, is comprised the following steps by one section of interrupt routine：
(1) interrupt and start；
(2) interrupt spot is protected；
(3) converter AD is sampled；
(4) AD data processings；
(5) outer voltage calculates；
(6) amplitude limiting processing；
(7) current inner loop 1 calculates；
(8) DC/DC converter units 1PWM sends out ripple；
(9) current inner loop 2 calculates；
(10) DC/DC converter units 2PWM sends out ripple；
(11) interrupt spot is recovered；
(12) the interruption ends.
The above is only the preferred embodiment of the present invention, it is all done according to the utility model claims scope it is equal
It Deng variation and modifies, should all belong to the covering scope of the utility model claims.
Claims (8)
1. a kind of isolation type bidirectional DC/AC power supplys, including two-way DC/AC converters (100), isolation type bidirectional DC/DC converters
(200), which is characterized in that the DC side of the two-way DC/AC converters (100) connects the isolation type bidirectional DC/DC conversion
Device (200) high-pressure side, the DC side of the two-way DC/AC converters (100) are equipped with double-bus, i.e. the positive direct-current of BUS+ to N is female
The negative dc bus of line, N to BUS-, the two-way DC/AC converters (100) are stablized and are balanced the positive direct-current busbar and bear straight
Flow busbar.
2. isolation type bidirectional DC/AC power supplys according to claim 1, which is characterized in that the isolation type bidirectional DC/DC becomes
Parallel operation (200) include the first two-way DC/DC converter units (30) and the second two-way DC/DC converter units (40), described first pair
There is identical topological structure, topology knot with the described second two-way DC/DC converter units (40) to DC/DC converter units (30)
Structure includes sequentially connected low-voltage module (31), isolating transformer (32) and high-pressure modular (33).
3. isolation type bidirectional DC/AC power supplys according to claim 1 or 2, which is characterized in that the first two-way DC/DC
The BUS of the positive terminal of converter unit (30) high-pressure modular and the positive direct-current busbar of two-way DC/AC converters (100) DC side
+ end is connected, negative pole end and the two-way DC/AC converters of first two-way DC/DC converter units (30) high-pressure modular
(100) N-terminal of the positive direct-current busbar of DC side is connected, the anode of second two-way DC/DC converter units (40) high-pressure modular
End is connected with the N-terminal of the negative dc bus of two-way DC/AC converters (100) DC side, the second two-way DC/DC conversion
The BUS- ends of the negative pole end of unit (40) high-pressure modular and the negative dc bus of two-way DC/AC converters (100) DC side
It is connected, low-voltage module (31) and the described second two-way DC/DC converter units of the first two-way DC/DC converter units (30)
(40) low-voltage module (31) is in parallel in the low-pressure side of the two-way DC/AC power supplys.
4. isolation type bidirectional DC/AC power supplys according to claim 1, which is characterized in that the first two-way DC/DC conversion
In unit (30) and the high-pressure modular of the second two-way DC/DC converter units (40) pressure voltage of selected switching tube less than it is described just
The summation of d-c bus voltage value and negative d-c bus voltage value.
5. isolation type bidirectional DC/AC power supplys according to claim 4, which is characterized in that the switching tube is real by metal-oxide-semiconductor
Now or by asymmetric one diode of IGBT pipes inverse parallel realize；The switching tube is equipped with control terminal, positive terminal, cathode
End.
6. isolation type bidirectional DC/AC power supplys according to claim 1, which is characterized in that the isolation type bidirectional DC/DC becomes
There are one closed loop controller (500), DC/DC converter units (30) two-way to described first and the second two-way DC/DC changes for parallel operation tool
Unit (40) is changed to be controlled；
7. isolation type bidirectional DC/AC power supplys according to claim 6, which is characterized in that in the closed loop controller (500)
There are one outer voltages (501) for tool；The outer voltage (501) has the desired value V_low_ref and isolation type bidirectional DC/
The feedback quantity V_low of AC power supplies low-pressure side voltage, the margin of error of the two form voltage after the outer voltage pi regulator
The output of outer shroud (501)；There are two independent current inner loops (502) for closed loop controller (500) tool；In described two electric currents
The desired value of ring (502) is the output of the outer voltage (501), and the feedback quantity of described two current inner loops (502) is first
Two-way DC/DC converter units (30) and the actual current value of the second two-way DC/DC converter units (40) low-pressure side；In two electric currents
The respective margin of error of ring forms closed loop adjusting after current inner loop pi regulator.
8. isolation type bidirectional DC/AC power supplys according to claim 6, which is characterized in that the first two-way DC/DC conversion
Unit (30) and the PWM carrier waves of the second two-way DC/DC converter units (40) each independence and phase difference 180 degree, with reality
Existing low-pressure side crisscross parallel function, so as to which the current ripples of the two-way DC/DC converters low-pressure side be greatly reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721501059.4U CN207460027U (en) | 2017-11-08 | 2017-11-08 | Isolation type bidirectional DC/AC power supplys |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107666254A (en) * | 2017-11-08 | 2018-02-06 | 东莞市赛因电源有限公司 | Isolation type bidirectional DC/AC power supplys |
| CN109738678A (en) * | 2019-03-22 | 2019-05-10 | 广东电网有限责任公司 | A kind of voltage dip generating unit and voltage dip generator |
| CN110572069A (en) * | 2018-06-06 | 2019-12-13 | 苏州捷芯威半导体有限公司 | Bidirectional DC-AC converter |
| US20210132149A1 (en) * | 2019-11-01 | 2021-05-06 | Beijing Xiaomi Mobile Software Co., Ltd. | Flash switch on-off detection circuit and electronic device |
-
2017
- 2017-11-08 CN CN201721501059.4U patent/CN207460027U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107666254A (en) * | 2017-11-08 | 2018-02-06 | 东莞市赛因电源有限公司 | Isolation type bidirectional DC/AC power supplys |
| CN110572069A (en) * | 2018-06-06 | 2019-12-13 | 苏州捷芯威半导体有限公司 | Bidirectional DC-AC converter |
| CN110572069B (en) * | 2018-06-06 | 2020-11-06 | 苏州捷芯威半导体有限公司 | Bidirectional DC-AC converter |
| CN109738678A (en) * | 2019-03-22 | 2019-05-10 | 广东电网有限责任公司 | A kind of voltage dip generating unit and voltage dip generator |
| CN109738678B (en) * | 2019-03-22 | 2024-06-04 | 广东电网有限责任公司 | Voltage sag generating unit and voltage sag generator |
| US20210132149A1 (en) * | 2019-11-01 | 2021-05-06 | Beijing Xiaomi Mobile Software Co., Ltd. | Flash switch on-off detection circuit and electronic device |
| US11874326B2 (en) * | 2019-11-01 | 2024-01-16 | Beijing Xiaomi Mobile Software Co., Ltd. | Flash switch on-off detection circuit and electronic device |
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