CN101309052A - Double step-up/double step-down combined AC/AC converting circuit - Google Patents
Double step-up/double step-down combined AC/AC converting circuit Download PDFInfo
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- CN101309052A CN101309052A CNA2008101229826A CN200810122982A CN101309052A CN 101309052 A CN101309052 A CN 101309052A CN A2008101229826 A CNA2008101229826 A CN A2008101229826A CN 200810122982 A CN200810122982 A CN 200810122982A CN 101309052 A CN101309052 A CN 101309052A
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Abstract
Disclosed is dual booster/dual buck combination AC-AC conversion circuit which belongs to the AC-AC frequency conversion technology. The circuit includes a power supply, two booster bridge circuits (1, 3), two buck bridge circuits (5, 7), a DC section circuit (4) in the middle and an output filtering circuit (6). The two booster bridge circuits form a dual booster PWM rectifying circuit; the second booster bridge circuit works at the positive half cycle of the input current and the first booster bridge circuit works at the negative half cycle of the input current. The two buck bridge circuits form the dual buck circuit; the first buck bridge circuit works at the positive half cycle of the input current and the second buck bridge circuit works at the negative half cycle of the input current. The dual booster PWM rectifying circuit and the dual buck circuit all adopt the current hysteresis control method which has the ability of automatic current limit and has fast dynamic response. The dual booster/dual buck combination AC-AC conversion circuit of the invention is suitable for the medium and large power field with high efficiency, such as the airplane frequency conversion power supply, UPS, new energy electricity generation which have unified surge control and active filtering.
Description
Technical field
What the present invention relates to is a kind of two boosting/pair step-down composite type ac-ac conversion circuit, belongs to the AC-AC frequency conversion technology in the transformation of electrical energy device.
Background technology
At present, the variable frequency alternating current power source technology since its have that system unit is few, simple in structure, efficient is high, in light weight, many-sided advantage such as volume is little, cost is low, reliability is high, maintainability is good, all obtained application widely in multiple occasions such as the generating electricity by way of merging two or more grid systems of regenerative resources such as aircraft AC power, static reactive (SVG), THE UPFC (UPFC), Superconductive Magnetic Energy Storage (SMES) (SMES), the driving of four-quadrant alternating current machine, solar energy, wind energy, active power filtering (APF), large-capacity ups.
On modern aircraft, variable frequency AC power system has been substituted traditional variable speed constant frequency AC power system and constant-speed and constant-frequency power-supply system.Only need be because of variable frequency AC power system through time energy conversion, promptly generator is converted into electric energy with the mechanical energy of engine.Thereby avoided traditional Technology Need trouble through twice energy conversion.In recent years, all strengthened the research of variable frequency AC power system with the world big state of each aviation beautiful, the Ou Wei representative.Large-scale civil aircraft power consumption is big, and do not require directly to use the power consumption equipment ratio of frequency-changing AC electricity higher to frequency change, it is more superior that variable frequency AC power system seems, represents the A380 of European Air Passenger company of current large-scale civil aircraft advanced level and the B787 aircraft of Boeing Co. all to adopt variable frequency AC power system.Variable frequency AC power system also is the preferred option of Future in China large aircraft power-supply system.
PWM rectification/the inverter circuit that adopts both at home and abroad is based on half-bridge or full bridge structure at present.The main deficiency of this circuit topology is: switching tube is connected, and has the hidden danger of switching tube shoot through.The fly-wheel diode of this circuit is the parasitic diode of switching tube simultaneously, and its reverse recovery time is quite long, causes big reverse recovery loss.These two problems make the reliability and the conversion efficiency of this PWM ac-ac conversion circuit be subjected to influence.
Summary of the invention
Technical problem: the objective of the invention is to solve above-mentioned problems of the prior art, propose a kind of novel PWM ac-ac conversion circuit, this circuit is applicable to various requirement high stability, high efficiency occasions such as the generating electricity by way of merging two or more grid systems of regenerative resource, active power filtering (APF), large-capacity ups and aircraft variable frequency power supply of new generation.
Technical scheme:
The present invention is achieved by the following technical solutions:
A kind of two boosting/pair step-down composite type ac-ac conversion circuit, comprise the input power supply, first bridge arm circuit of boosting, second the boost bridge arm circuit and the first step-down bridge arm circuit, the second step-down bridge arm circuit, intermediate dc link circuit, output filter circuit, intermediate dc link circuit comprises first electric capacity and second electric capacity, first electric capacity and second capacitances in series, and series connection point ground connection, it is characterized in that: first bridge arm circuit of boosting comprises first power switch pipe, first inductance, first diode, the source electrode of first power switch pipe connects the negative electrode of first diode, and both joint lead-out wires connect an end of first inductance; Second bridge arm circuit of boosting comprises second power switch pipe, second diode, second inductance, and the drain electrode of second power switch pipe connects the anode of second diode, and both joint lead-out wires connect an end of second inductance; The drain electrode of first power switch pipe links to each other with the negative electrode of second diode, and the anode of first diode links to each other with the source electrode of second power switch pipe, and the other end of first inductance is connected with the other end of second inductance, and both joint lead-out wires connect power supply; The source electrode of second power switch pipe connects the other end of second electric capacity, and the negative electrode of second diode connects the other end of first electric capacity; The first step-down bridge arm circuit comprises the 3rd power switch pipe, the 3rd inductance, the 3rd diode, and the source electrode of the 3rd power switch pipe connects the negative electrode of the 3rd diode, and both joint lead-out wires connect an end of the 3rd inductance; The second step-down bridge arm circuit comprises the 4th power switch pipe, the 4th inductance, the 4th diode, and the drain electrode of the 4th power switch pipe connects the anode of the 4th diode, and both joint lead-out wires connect an end of the 4th inductance; The drain electrode of the 3rd power switch pipe links to each other with the negative electrode of the 4th diode, and the anode of the 3rd diode links to each other with the source electrode of the 4th power switch pipe; The other end of the 3rd inductance is connected with the other end of the 4th inductance, and both connect output filter circuit by the joint lead-out wire; The negative electrode of second diode connects the drain electrode of the 3rd power switch pipe, and the source electrode of second power switch pipe is connected with the anode of the 3rd diode.
The present invention is two boosts/pair step-down composite type ac-ac conversion circuit, is made of front and back stages.Prime is two boost type PWM rectification circuits, comprises first bridge arm circuit and second bridge arm circuit of boosting of boosting, in the bridge arm circuit work of boosting of the positive half cycle second of input current, in the bridge arm circuit work of boosting of the negative half period first of input current.The back level is the dual-buck circuit, comprises the first step-down bridge arm circuit and the second step-down bridge arm circuit, in the positive half cycle first step-down bridge arm circuit work of output current, in the negative half period second step-down bridge arm circuit work of output current.
Front and back stages all adopts the electric current hysteresis control method thereof, and that circuit is applicable to is high-power in aircraft variable frequency power supply and UPS, generation of electricity by new energy, unified trend control, the active power filtering etc., require high efficiency occasion.
The present invention both can realize the output of frequency conversion input constant frequency, also can realize the AC voltage conversion of constant frequency input frequency conversion output.By appropriate combination, can constitute the output of three-phase input/three-phase in addition, single-phase input/three-phase output and three-phase input/ac-ac conversion circuit such as single-phase output.
Beneficial effect: this circuit is based on the PWM rectification/inversion transformation technique of two boosting/pair step-down, and the structure of having avoided two switching tube series connection and DC power supply and having connect has been eliminated the possibility of shoot through, the defective of also having avoided using diode continuousing flow in the switch body.Front and back stages all adopts the electric current hysteresis control method thereof, have dynamic response fast, advantage such as automatic current limiting ability arranged.Control method is simple, is easy to realize.No bridge arm direct pass, no switching tube body diode reverse are recovered problem points, the efficient height of translation circuit; Entire circuit structure and controlling schemes are all comparatively simple, are easy to realize.
Description of drawings
To be that the present invention is two boost Fig. 1/circuit diagram of pair step-down composite type ac-ac conversion circuit.
Label title among Fig. 1: 1: the first bridge arm circuit of boosting; 2: power supply; 3: the second bridge arm circuit of boosting; 4: intermediate dc link circuit; 5: the first step-down bridge arm circuit; 6: output filter circuit; 7: the second step-down bridge arm circuit.
To be that the present invention is two boost/pair each switch mode schematic diagram of step-down composite type ac-ac conversion circuit Fig. 2:
Fig. 2 (a) is the schematic diagram of two boost type PWM rectifying part operation mode I.
Fig. 2 (b) is the schematic diagram of two boost type PWM rectifying part operation mode II.
Fig. 2 (c) is the schematic diagram of two boost type PWM rectifying part operation mode III.
Fig. 2 (d) is the schematic diagram of two boost type PWM rectifying part operation mode IV.
Fig. 2 (e) is the schematic diagram of dual-buck inversion part operation mode I.
Fig. 2 (f) is the schematic diagram of dual-buck inversion part operation mode II.
Fig. 2 (g) is the schematic diagram of dual-buck inversion part operation mode III.
Fig. 2 (h) is the schematic diagram of dual-buck inversion part operation mode IV.
To be that the present invention is two boost Fig. 3/control block diagram that pair step-down composite type ac-ac conversion circuit adopts.
To be that the present invention is two boost/pair step-down composite type ac-ac conversion circuit prime rectification link primary waves shape schematic diagram Fig. 4.
To be that the present invention is two boost Fig. 5/pair step-down composite type ac-ac conversion circuit after the main waveform schematic diagram of level inversion link.
Symbol among Fig. 1-Fig. 5 and element names are said the name of sth. bright:
S
1, S
2, S
3, S
4: first power switch pipe～the 4th power switch pipe, D
1, D
2, D
3, D
4: first diode～the 4th diode, L
1, L
2, L
3, L
4: first inductance～the 4th inductance, C
1: first electric capacity, C
2: second electric capacity, C
o: output filter capacitor, V
e: voltage error signal, V
Ref: reference voltage, i
Ref: reference current, u
e: back step voltage ring output signal, v
In: input voltage, i
In: input current, i
L1: flow through inductance L
1Current waveform, i
L2: flow through inductance L
2Current waveform, i
L3: flow through inductance L
3Current waveform, i
L4: flow through inductance L
4Current waveform, Drive1: switching tube S
1Drive waveforms, Drive2: switching tube S
2Drive waveforms, Drive3: switching tube S
3Drive waveforms, Drive4: switching tube S
4Drive waveforms, u
0: output voltage, i
0: output current.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
Fig. 1 is the circuit diagram of two boosting/pair step-down composite type ac-ac conversion circuit, comprise power supply 2, first boost bridge arm circuit 1, second boost bridge arm circuit 3 and the first step-down bridge arm circuit 5, the second step-down bridge arm circuit 7, intermediate dc link circuit 4, output filter circuit 6, intermediate dc link circuit comprises first capacitor C
1With second capacitor C
2, first capacitor C
1With second capacitor C
2Series connection, and series connection point ground connection, first bridge arm circuit 1 of boosting comprises first power switch tube S
1, first inductance L
1, the first diode D
1, first power switch tube S
1Source electrode meet the first diode D
1Negative electrode, both connect first inductance L by the joint lead-out wire
1An end; Second bridge arm circuit 3 of boosting comprises second power switch tube S
2, the second diode D
2, second inductance L
2, second power switch tube S
2Drain electrode meet the second diode D
2Anode, both connect second inductance L by the joint lead-out wire
2An end; First power switch tube S
1The drain electrode and the second diode D
2Negative electrode link to each other the first diode D
1The anode and second power switch tube S
2Source electrode link to each other first inductance L
1The other end and second inductance L
2The other end be connected, and both joint lead-out wires connect power supply; Second power switch tube S
2Source electrode connect second capacitor C
2The other end, the second diode D
2Negative electrode connect first capacitor C
1The other end; The first step-down bridge arm circuit 5 comprises the 3rd power switch tube S
3, the 3rd inductance L
3, the 3rd diode D
3, the 3rd power switch tube S
3Source electrode meet the 3rd diode D
3Negative electrode, both connect the 3rd inductance L by the joint lead-out wire
3An end; The second step-down bridge arm circuit 7 comprises the 4th power switch tube S
4, the 4th inductance L
4, the 4th diode D
4, the 4th power switch tube S
4Drain electrode meet the 4th diode D
4Anode, both connect the 4th inductance L by the joint lead-out wire
4An end; The 3rd power switch tube S
3Drain electrode and the 4th diode D
4Negative electrode link to each other the 3rd diode D
3Anode and the 4th power switch tube S
4Source electrode link to each other; The 3rd inductance L
3The other end and the 4th inductance L
4The other end be connected, both connect output filter circuit 6 by the joint lead-out wire; The second diode D
2Negative electrode connect the 3rd power switch tube S
3Drain electrode, second power switch tube S
2Source electrode and the 3rd diode D
3Anode be connected.
The two two step-down composite type ac-ac conversion circuit that boost of the present invention are made of front and back stages.Prime is two boost type PWM rectification circuits, comprises first bridge arm circuit and the second bridge wall circuit that boosts that boosts, in the bridge arm unit work of boosting of the positive half cycle second of input current, in the bridge arm unit work of boosting of the negative half period first of input current.The back level is the dual-buck circuit, comprises the first step-down bridge arm circuit and the second step-down bridge arm circuit, in the positive half cycle first step-down bridge arm circuit work of output current, in the negative half period second step-down bridge arm circuit work of output current.
To be that the present invention is two boost/pair each switch mode schematic diagram of step-down composite type ac-ac conversion circuit Fig. 2.
Because front and back stages adopts independent control, so followingly introduce operation principle respectively according to front and back stages.The operation principle of entire circuit is two parts combinations.
One, two boost type PWM rectifying part
When input current greater than 0, when being in positive half cycle, the second booster type bridge arm circuit 3 and input power supply v
InAnd 4 work of output intermediate link, the first booster type bridge arm circuit 1 is not worked; And work as input current less than 0, and when being in negative half period, the first booster type bridge arm circuit 1 and input power supply v
InAnd 4 work of intermediate dc link circuit, the second booster type bridge arm circuit 3 is not worked.Circuit has four operation modes under this pattern:
1. operation mode I
Shown in Fig. 2 (a), input voltage v
In＞0, input current equals second inductance L
2Electric current, i
L2＞0, first inductance L
1Current i
L1=0, second power switch tube S
2Open-minded, the second diode D
2End current i
L2The linear rising.
2. operation mode II
Shown in Fig. 2 (b), input voltage v
In＞0, input current equals second inductance L
2Electric current, i
L2＞0, first inductance L
1Current i
L1=0, second power switch tube S
2Close the second diode D
2Conducting, current i
L2Linear decline.
3. operation mode III
Shown in Fig. 2 (c), input voltage v
In＜0, input current equals first inductance L
1Electric current, i
L1＜0, second inductance L
2Current i
L2=0, first power switch tube S
1Open-minded, the first diode D
1End current i
L1The linear rising.
4. operation mode IV
Shown in Fig. 2 (d), input voltage v
In＜0, input current equals first inductance L
1Electric current, i
L1＜0, second inductance L
2Current i
L2=0, first power switch tube S
1Close the first diode D
1Conducting, current i
L1Linear decline.
Two, dual-buck inversion part
When output current greater than 0, when being in positive half cycle, the first voltage-dropping type bridge arm circuit 5 and 4 work of intermediate dc link circuit, do not work in the second voltage-dropping type bridge arm circuit unit 7; And work as input current less than 0, and when being in negative half period, the second voltage-dropping type bridge arm circuit unit 7 and 4 work of intermediate dc link circuit, do not work in the first voltage-dropping type bridge arm circuit unit 5.Circuit has four operation modes under this pattern:
1. operation mode I
Shown in Fig. 2 (e), this moment, output current equaled first inductance L
1Electric current, i
L1＞0, second inductance L
2Current i
L2The=0, the 3rd power switch tube S
3Open-minded, the 3rd diode D
3End current i
L1The linear rising.
2. operation mode II
Shown in Fig. 2 (f), output current equals first inductance L
1Electric current, i
L1＞0, second inductance L
2Current i
L2The=0, the 3rd power switch tube S
3Close the 3rd diode D
3Conducting, current i
L1Linear decline.
3. operation mode III
Shown in Fig. 2 (g), output current equals second inductance L
2Electric current, i
L2＜0, first inductance L
1Current i
L1The=0, the 4th power switch tube S
4Open-minded, the 4th diode D
4End current i
L2The linear rising.
4. operation mode IV
Shown in Fig. 2 (h), output current equals second inductance L
2Electric current, i
L2＜0, first inductance L
1Current i
L1The=0, the 4th power switch tube S
4Close the 4th diode D
4Conducting, current i
L2Linear decline.
To be that the present invention is two boost Fig. 3/control circuit block diagram that pair step-down composite type ac-ac conversion circuit adopts, front and back stages all adopts the hysteresis current control technology, compare with traditional semi-bridge type PWM commutation inversion control mode, only increased a zero-crossing comparator and several logic gates, control is simple.That summarizes says, to prime is: reference voltage V
RefAnd output voltage V
oThe difference of sampled value obtains voltage error signal V through the first Voltage loop adjuster
e, voltage error signal V
eWith input voltage V
InSampled value multiply each other, as the reference current i of electric current loop
Ref, reference current i
RefSend into first hysteresis comparator with the input current sampled value again, produce high-frequency modulation signal through first hysteresis comparator, this high-frequency modulation signal finally obtains first power switch tube S again through first control logic circuit
1With second power switch tube S
2Drive signal.In the positive half cycle control second of the input current bridge arm circuit work of boosting, in the negative half period control first of the input current bridge arm circuit work of boosting.To back grade: the difference of sinusoid fiducial signal and output voltage sampled value is step voltage ring output signal u after the second Voltage loop adjuster obtains
e, and send into second hysteresis comparator with the output current detection signal, again through second control logic circuit, produce the 3rd power switch tube S
3With the 4th power switch tube S
4Drive signal, make output current floating voltage error signal.Control the first step-down bridge arm circuit work at the positive half cycle of output current, control the second step-down bridge arm circuit work at the negative half period of output current.
Fig. 4,5 has provided some main waveforms of a simulation example of circuit of the present invention.Simulation parameter is as follows: input voltage 115V/500Hz (frequency can change at 360Hz-800Hz), power output 1kW.By input voltage waveform v
InWith input current waveform i
InAs can be seen, input current can be good at following the tracks of line voltage, and the prime rectification circuit is operated under the unity power factor.Output voltage and output current sine.In addition, by the waveform i of four inductive currents
L1, i
L2, i
L3, i
L4And the drive waveforms Drive1 of power switch pipe, Drive2, Drive3, Drive4 are as can be seen, and the prime rectifying part is worked respectively in the positive-negative half-cycle of input current, and back level inversion part is worked respectively in the positive-negative half-cycle of output current.
Claims (1)
1, a kind of two boosting/pair step-down composite type ac-ac conversion circuit, comprise power supply (2), two bridge arm circuit of boosting (1,3) and two step-down bridge arm circuit (5,7), intermediate dc link circuit (4), output filter circuit (6), intermediate dc link circuit comprises the first electric capacity (C
1) and the second electric capacity (C
2), the first electric capacity (C
1) and the second electric capacity (C
2) series connection, and series connection point ground connection is characterized in that: first bridge arm circuit (1) of boosting comprises the first power switch pipe (S
1), the first inductance (L
1), the first diode (D
1), the first power switch pipe (S
1) source electrode meet the first diode (D
1) negative electrode, both joint lead-out wires meet the first inductance (L
1) an end; Second bridge arm circuit (3) of boosting comprises the second power switch pipe (S
2), the second diode (D
2), the second inductance (L
2), the second power switch pipe (S
2) drain electrode meet the second diode (D
2) anode, both joint lead-out wires meet the second inductance (L
2) an end; First power switch pipe (the S
1) the drain electrode and the second diode (D
2) negative electrode link to each other the first diode (D
1) the anode and the second power switch pipe (S
2) source electrode link to each other the first inductance (L
1) the other end and the second inductance (L
2) the other end be connected, and both joint lead-out wires connect power supply; Second power switch pipe (the S
2) source electrode meet the second electric capacity (C
2) the other end, the second diode (D
2) negative electrode meet the first electric capacity (C
1) the other end; The first step-down bridge arm circuit (5) comprises the 3rd power switch pipe (S
3), the 3rd inductance (L
3), the 3rd diode (D
3), the 3rd power switch pipe (S
3) source electrode meet the 3rd diode (D
3) negative electrode, both joint lead-out wires meet the 3rd inductance (L
3) an end; The second step-down bridge arm circuit (7) comprises the 4th power switch pipe (S
4), the 4th inductance (L
4), the 4th diode (D
4), the 4th power switch pipe (S
4) drain electrode meet the 4th diode (D
4) anode, both joint lead-out wires meet the 4th inductance (L
4) an end; The 3rd power switch pipe (S
3) drain electrode and the 4th diode (D
4) negative electrode link to each other the 3rd diode (D
3) anode and the 4th power switch pipe (S
4) source electrode link to each other; The 3rd inductance (L
3) the other end and the 4th inductance (L
4) the other end be connected, both joint lead-out wires connect output filter circuit (6); Second diode (the D
2) negative electrode meet the 3rd power switch pipe (S
3) drain electrode, the second power switch pipe (S
2) source electrode and the 3rd diode (D
3) anode be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101229826A CN101309052A (en) | 2008-06-20 | 2008-06-20 | Double step-up/double step-down combined AC/AC converting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101229826A CN101309052A (en) | 2008-06-20 | 2008-06-20 | Double step-up/double step-down combined AC/AC converting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101309052A true CN101309052A (en) | 2008-11-19 |
Family
ID=40125317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101229826A Pending CN101309052A (en) | 2008-06-20 | 2008-06-20 | Double step-up/double step-down combined AC/AC converting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101309052A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015085926A1 (en) * | 2013-12-10 | 2015-06-18 | Neal George Stewart | Improved high frequency series ac voltage regulator |
| CN106452141A (en) * | 2016-08-09 | 2017-02-22 | 南京航空航天大学 | Three-phase dual-input inverter not having bridge arm shoot-through risk |
| CN109088542A (en) * | 2018-11-05 | 2018-12-25 | 江苏工程职业技术学院 | A kind of combined bidirectional DC transfer circuit |
| CN112701905A (en) * | 2021-01-28 | 2021-04-23 | 三峡大学 | Single-phase three-level power factor correction circuit based on pseudo totem-pole structure |
| CN113206601A (en) * | 2021-04-12 | 2021-08-03 | 三峡大学 | Direct current charger based on single-phase II type three-level pseudo totem pole |
-
2008
- 2008-06-20 CN CNA2008101229826A patent/CN101309052A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015085926A1 (en) * | 2013-12-10 | 2015-06-18 | Neal George Stewart | Improved high frequency series ac voltage regulator |
| CN106452141A (en) * | 2016-08-09 | 2017-02-22 | 南京航空航天大学 | Three-phase dual-input inverter not having bridge arm shoot-through risk |
| CN106452141B (en) * | 2016-08-09 | 2019-09-03 | 南京航空航天大学 | A kind of three-phase dual input inverter of no bridge arm direct pass risk |
| CN109088542A (en) * | 2018-11-05 | 2018-12-25 | 江苏工程职业技术学院 | A kind of combined bidirectional DC transfer circuit |
| CN112701905A (en) * | 2021-01-28 | 2021-04-23 | 三峡大学 | Single-phase three-level power factor correction circuit based on pseudo totem-pole structure |
| CN112701905B (en) * | 2021-01-28 | 2022-02-01 | 三峡大学 | Single-phase three-level power factor correction circuit based on pseudo totem-pole structure |
| CN113206601A (en) * | 2021-04-12 | 2021-08-03 | 三峡大学 | Direct current charger based on single-phase II type three-level pseudo totem pole |
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Open date: 20081119 |