CN102891619A - Staggered parallel-type three-level dual-buck full-bridge inverter - Google Patents

Staggered parallel-type three-level dual-buck full-bridge inverter Download PDF

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Publication number
CN102891619A
CN102891619A CN2012102160646A CN201210216064A CN102891619A CN 102891619 A CN102891619 A CN 102891619A CN 2012102160646 A CN2012102160646 A CN 2012102160646A CN 201210216064 A CN201210216064 A CN 201210216064A CN 102891619 A CN102891619 A CN 102891619A
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China
Prior art keywords
switch pipe
pole switch
triple
power
pole
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赵鑫
洪峰
刘周成
王成华
杨剑青
姚伟
季鑫
尹培培
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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Abstract

The invention discloses a staggered parallel-type three-level dual-buck full-bridge inverter. The staggered parallel-type three-level dual-buck full-bridge inverter comprises a first full-bridge inverter 1, a second full-bridge inverter 2, a power frequency reversing circuit 3 and a load circuit 4. The half-cycle work of an inverter circuit is controlled by adopting peak current control according to the direction of an inductive current and the magnitude of an output voltage. The staggered parallel-type three-level dual-buck full-bridge inverter has the advantages that the topology has no problem of bridge-arm straight-through or switch tube parasitic diode reverse recovery; the voltage stress is halved; the harmonic content of the output voltage is low; the system efficiency and the power level are high; and moreover, the staggered parallel-type three-level dual-buck full-bridge inverter is easy to control and implement and the like.

Description

Crisscross parallel type three-level double step-down full bridge inverter
One, technical field
The present invention relates to a kind of crisscross parallel type three-level double step-down full bridge inverter, belong to the inverter in the electrical energy changer.
Two, background technology
Along with the development of power electronic technology, inverter has obtained studying widely and using, and some specific occasion is also had higher requirement to inverter simultaneously: avoid the straight-through problem of power triple-pole switch pipe and improve the input direct voltage utilance.Three-level double step-down full bridge inverter (dual buck full bridge three-level inverter, hereinafter to be referred as DBFBTLI) be a kind of topological structure that can finely address the above problem, with respect to traditional inverter, this inverter have without bridge arm direct pass, inactivity triple-pole switch pipe parasitic body diode reverse-recovery problems, voltage stress reduce by half, the advantage such as little, the topological switching loss of harmonic wave of output voltage content own is little, be a kind of topological structure that has very much researching value and development prospect.Use simultaneously the current stress that interleaving technique can effectively reduce output current ripple and switching device, the size that reduces single output inductor capacity and electromagnetic interface filter, improve power grade and the efficient of inverter circuit.
Three, summary of the invention
1, goal of the invention: the purpose of this invention is to provide a kind of inverter that adopts interleaving technique to improve power grade and reduce output current ripple.
2, technical scheme: in order to solve above-mentioned technical problem, crisscross parallel type three-level double step-down full bridge inverter of the present invention comprises the first full bridge inverter 1, the second full bridge inverter 2, power frequency commutating circuit 3 and load circuit 4.The first full bridge inverter 1 comprises the first power triple-pole switch pipe S 1, the second power triple-pole switch pipe S 2, the first sustained diode 1, the second sustained diode 2, the first output inductor L 1, the second output inductor L 2The second full bridge inverter 2 comprises the 3rd power triple-pole switch pipe S 3, the 4th power triple-pole switch pipe S 4, the 3rd sustained diode 3, the 4th sustained diode 4, the 3rd output inductor L 3, the 4th output inductor L 4Power frequency commutating circuit 3 comprises the first power frequency power triple-pole switch pipe S 5, the second power frequency power triple-pole switch pipe S 6Load circuit 4 comprises output filter capacitor C fWith load resistance R.The first full bridge inverter 1 and the second full bridge inverter 2 are in parallel at input side and outlet side, share input power, power frequency commutating circuit and load circuit.Crisscross parallel type three-level double step-down full bridge inverter of the present invention is characterised in that, the first power triple-pole switch pipe S 1Drain electrode be connected with the positive pole of external power supply U; The first power triple-pole switch pipe S 1Source electrode and the first sustained diode 1Negative electrode, be connected to the first output inductor L 1An end; The first sustained diode 1Anode, be connected to the negative pole of external power supply U; The second power triple-pole switch pipe S 2Source electrode be connected with the negative pole of external power supply U; The second power triple-pole switch pipe S 2Drain electrode and the second sustained diode 2Anode, be connected to the second output inductor L 2An end; The second sustained diode 2Negative electrode, be connected to the positive pole of external power supply U; The 3rd power triple-pole switch pipe S 3Drain electrode be connected with the positive pole of external power supply U; The 3rd power triple-pole switch pipe S 3Source electrode and the 3rd sustained diode 3Negative electrode, be connected to the 3rd output inductor L 3An end; The 3rd sustained diode 3Anode, be connected to the negative pole of external power supply U; The 4th power triple-pole switch pipe S 4Source electrode be connected with the negative pole of external power supply U; The 4th power triple-pole switch pipe S 4Drain electrode and the 4th sustained diode 4Anode, be connected to the 4th output inductor L 4An end; The 4th sustained diode 4Negative electrode, be connected to the positive pole of external power supply U; The first output inductor L 1, the second output inductor L 2, the 3rd output inductor L 3, the 4th output inductor L 4The other end be connected to output filter capacitor C fThe upper end; The first power frequency power triple-pole switch pipe S 5Drain electrode be connected with the positive pole of external power supply U; The first power frequency power triple-pole switch pipe S 5Source electrode and the second power frequency power triple-pole switch pipe S 6Drain electrode, be connected to output filter capacitor C fThe lower end; The second power frequency power triple-pole switch pipe S 6Source electrode be connected with the negative pole of external power supply U; Load resistance R is connected in parallel on output filter capacitor C fTwo ends.
3, beneficial effect: the present invention is the crisscross parallel type three-level double step-down full bridge inverter that can realize the zero current turning-on invert function, have following advantage: (1) need not introduce resonant circuit, auxiliary switch, can realize the zero current turning-on of inverter power switching tube, and control is simple; (2) along with the introducing of interleaving technique, so that this inverter volume becomes less, is more suitable in large-power occasions; (3) output current harmonics content is low.
4, description of drawings
Fig. 1 is the crisscross parallel type three-level double step-down full bridge inverter structural representation of realizing the zero current turning-on invert function of the present invention, the label title: 1. the first full bridge inverter; 2. the second full bridge inverter; 3, power frequency commutating circuit; 4, load circuit;
Fig. 2 is each switch mode schematic diagram of crisscross parallel type three-level double step-down full bridge inverter of realizing the zero current turning-on invert function of the present invention;
Fig. 3 is the control block diagram of realizing the crisscross parallel type three-level double step-down full bridge inverter employing of zero current turning-on invert function of the present invention.
Main designation among the figure: S 1～S 4---the first～the 4th power triple-pole switch pipe.D 1～D 4---the first～the 4th fly-wheel diode.S 5, S 6---first, second power frequency power triple-pole switch pipe.L 1～L 4---the first～four output inductor.C f---output filter capacitor.i L1～i L4---the first～four output inductor electric current.i Z1, i Z2---the output current of the first full bridge inverter 1, the second full bridge inverter 2.u o---inverter output voltage.u r---the Voltage loop benchmark.i o---the inverter output current.i r---Voltage loop output is the electric current loop benchmark.CP 1, CP 2---clock pulse 1,2.Drv 1～drv 4---the first～the 4th power triple-pole switch pipe S 1～S 4Driving.Drv 5, drv 6---first, second power frequency power triple-pole switch pipe S 5, S 6Driving.U---external power supply.
Four, embodiment
As shown in Figure 1, the crisscross parallel type three-level double step-down full bridge inverter of the zero current turning-on realized of this example invert function is characterized in that, the first power triple-pole switch pipe S 1Drain electrode be connected with the positive pole of external power supply U; The first power triple-pole switch pipe S 1Source electrode and the first sustained diode 1Negative electrode, be connected to the first output inductor L 1An end; The first sustained diode 1Anode, be connected to the negative pole of external power supply U; The second power triple-pole switch pipe S 2Source electrode be connected with the negative pole of external power supply U; The second power triple-pole switch pipe S 2Drain electrode and the second sustained diode 2Anode, be connected to the second output inductor L 2An end; The second sustained diode 2Negative electrode, be connected to the positive pole of external power supply U; The 3rd power triple-pole switch pipe S 3Drain electrode be connected with the positive pole of external power supply U; The 3rd power triple-pole switch pipe S 3Source electrode and the 3rd sustained diode 3Negative electrode, be connected to the 3rd output inductor L 3An end; The 3rd sustained diode 3Anode, be connected to the negative pole of external power supply U; The 4th power triple-pole switch pipe S 4Source electrode be connected with the negative pole of external power supply U; The 4th power triple-pole switch pipe S 4Drain electrode and the 4th sustained diode 4Anode, be connected to the 4th output inductor L 4An end; The 4th sustained diode 4Negative electrode, be connected to the positive pole of external power supply U; The first output inductor L 1, the second output inductor L 2, the 3rd output inductor L 3, the 4th output inductor L 4The other end be connected to output filter capacitor C fThe upper end; The first power frequency power triple-pole switch pipe S 5Drain electrode be connected with the positive pole of external power supply U; The first power frequency power triple-pole switch pipe S 5Source electrode and the second power frequency power triple-pole switch pipe S 6Drain electrode, be connected to output filter capacitor C fThe lower end; The second power frequency power triple-pole switch pipe S 6Source electrode be connected with the negative pole of external power supply U; Load resistance R is connected in parallel on output filter capacitor C fTwo ends.
The crisscross parallel type three-level double step-down full bridge inverter of zero current turning-on invert function of realizing of the present invention can be divided into four operation intervals: 1. output current i oDuring positive half period, the first power triple-pole switch pipe S 1, the 3rd power triple-pole switch pipe S 3Alternately modulation work, the second power triple-pole switch pipe S 2With the 4th power triple-pole switch pipe S 4Cut-off, the second power frequency power triple-pole switch pipe S 6Conducting, the first power frequency power triple-pole switch pipe S 5Cut-off, this stage circuit can be divided into 6 operation modes; 2. output current i oDuring the positive half period zero passage, because the first power frequency power triple-pole switch pipe S 5, the second power frequency power triple-pole switch pipe S 6Be provided with the dead band, wouldn't work in this stage system; 3. output current i oDuring negative half-cycle, the second power triple-pole switch pipe S 2, the 4th power triple-pole switch pipe S 4Alternately modulation work, the first power triple-pole switch pipe S 1With the 3rd power triple-pole switch pipe S 3Cut-off, the first power frequency power triple-pole switch pipe S 5Conducting, the second power frequency power triple-pole switch pipe S 6Cut-off, this stage circuit can be divided into 6 operation modes; 4. output current i oDuring the negative half-cycle zero passage, because the first power frequency power triple-pole switch pipe S 5, the second power frequency power triple-pole switch pipe S 6Be provided with the dead band, wouldn't work in this stage system.
The below narrates operation principle and the operation mode of crisscross parallel type three-level double step-down full bridge inverter of the present invention Figure 1 shows that main circuit structure in conjunction with Fig. 2.
1. operation interval 1: output current i oFor just, the first power triple-pole switch pipe S 1, the 3rd power triple-pole switch pipe S 3Alternately modulation work, the second power triple-pole switch pipe S 2With the 4th power triple-pole switch pipe S 4Cut-off, the second power frequency power triple-pole switch pipe S 6Conducting, the first power frequency power triple-pole switch pipe S 5Cut-off, this stage comprises 6 operation modes altogether:
Operation mode I: shown in Fig. 2 (a), the first power triple-pole switch pipe S 1With the 3rd power triple-pole switch pipe S 3Conducting, the second power triple-pole switch pipe S 2, the 4th power triple-pole switch pipe S 4Cut-off, the second power frequency power triple-pole switch pipe S 6Conducting, the first power frequency power triple-pole switch pipe S 5Cut-off, full bridge inverter 1,2 is worked simultaneously, at this moment i Z2The rising of starting from scratch, i Z1Rise to gradually maximum.
Operation mode II: shown in Fig. 2 (b), the 3rd power triple-pole switch pipe S 3Conducting, the first power triple-pole switch pipe S 1, the second power triple-pole switch pipe S 2, the 4th power triple-pole switch pipe S 4Cut-off, the second power frequency power triple-pole switch pipe S 6Conducting, the first power frequency power triple-pole switch pipe S 5Cut-off, i Z1By the first sustained diode 1Afterflow descends, and full bridge inverter 1,2 is worked simultaneously, i Z2Continue to rise.
Operation mode III: shown in Fig. 2 (c), the 3rd power triple-pole switch pipe S 3Conducting, the first power triple-pole switch pipe S 1, the second power triple-pole switch pipe S 2, the 4th power triple-pole switch pipe S 4Cut-off, the second power frequency power triple-pole switch pipe S 6Conducting, the first power frequency power triple-pole switch pipe S 5Cut-off is owing to i this moment Z1Dropped to zero, the first sustained diode 1Cut-off, full bridge inverter 2 works independently, i Z2Continue to rise.
Operation mode IV: shown in Fig. 2 (d), the first power triple-pole switch pipe S 1With the 3rd power triple-pole switch pipe S 3Conducting, the second power triple-pole switch pipe S 2, the 4th power triple-pole switch pipe S 4Cut-off, the second power frequency power triple-pole switch pipe S 6Conducting, the first power frequency power triple-pole switch pipe S 5Cut-off, full bridge inverter 1,2 is worked simultaneously, at this moment i Z1The rising of starting from scratch, i Z2Rise to gradually maximum.
Operation mode V: shown in Fig. 2 (e), the first power triple-pole switch pipe S 1Conducting, the second power triple-pole switch pipe S 2, the 3rd power triple-pole switch pipe S 3, the 4th power triple-pole switch pipe S 4Cut-off, the second power frequency power triple-pole switch pipe S 6Conducting, the first power frequency power triple-pole switch pipe S 5Cut-off, i Z2By the 3rd sustained diode 3Afterflow descends, and full bridge inverter 1,2 is worked simultaneously, i Z1Continue to rise.
Operation mode VI: shown in Fig. 2 (f), the first power triple-pole switch pipe S 1Conducting, the second power triple-pole switch pipe S 2, the 3rd power triple-pole switch pipe S 3, the 4th power triple-pole switch pipe S 4Cut-off, the second power frequency power triple-pole switch pipe S 6Conducting, the first power frequency power triple-pole switch pipe S 5Cut-off is owing to i this moment Z2Dropped to zero, the 3rd sustained diode 3Cut-off, full bridge inverter 1 works independently, i Z1Continue to rise.
2. operation interval 2:
Operation mode VII: shown in Fig. 2 (g), because dead band time setting shorter, so the first power triple-pole switch pipe S 1, the second power triple-pole switch pipe S 2, the 3rd power triple-pole switch pipe S 3, the 4th power triple-pole switch pipe S 4, the first power frequency power triple-pole switch pipe S 5, the second power frequency power triple-pole switch pipe S 6All be in cut-off state, circuit wouldn't be worked, i Z1, i Z1Be zero.
3. operation interval 3: output current i oFor negative, the second power triple-pole switch pipe S 2, the 4th power triple-pole switch pipe S 4Alternately modulation work, the first power triple-pole switch pipe S 1With the 3rd power triple-pole switch pipe S 3Cut-off, the first power frequency power triple-pole switch pipe S 5Conducting, the second power frequency power triple-pole switch pipe S 6Cut-off, this stage comprises 6 operation modes altogether:
Operation mode VIII: shown in Fig. 2 (h), the second power triple-pole switch pipe S 2With the 4th power triple-pole switch pipe S 4Conducting, the first power triple-pole switch pipe S 1, the 3rd power triple-pole switch pipe S 3Cut-off, the first power frequency power triple-pole switch pipe S 5Conducting, the second power frequency power triple-pole switch pipe S 6Cut-off, full bridge inverter 1,2 is worked simultaneously, at this moment i Z2The decline of starting from scratch, i Z1Drop to gradually minimum value.
Operation mode IX: shown in Fig. 2 (i), the 4th power triple-pole switch pipe S 4Conducting, the first power triple-pole switch pipe S 1, the second power triple-pole switch pipe S 2, the 3rd power triple-pole switch pipe S 3Cut-off, the first power frequency power triple-pole switch pipe S 5Conducting, the second power frequency power triple-pole switch pipe S 6Cut-off, i Z1By the second sustained diode 2Afterflow is risen, and full bridge inverter 1,2 is worked simultaneously, i Z2Continue to descend.
Operation mode X: shown in Fig. 2 (j), the 4th power triple-pole switch pipe S 4Conducting, the first power triple-pole switch pipe S 1, the second power triple-pole switch pipe S 2, the 3rd power triple-pole switch pipe S 3Cut-off, the first power frequency power triple-pole switch pipe S 5Conducting, the second power frequency power triple-pole switch pipe S 6Cut-off is owing to i this moment Z1Risen to zero, the second sustained diode 2Cut-off, full bridge inverter 2 works independently, i Z2Continue to descend.
Operation mode XI: shown in Fig. 2 (k), the second power triple-pole switch pipe S 2With the 4th power triple-pole switch pipe S 4Conducting, the first power triple-pole switch pipe S 1, the 3rd power triple-pole switch pipe S 3Cut-off, the first power frequency power triple-pole switch pipe S 5Conducting, the second power frequency power triple-pole switch pipe S 6Cut-off, full bridge inverter 1,2 is worked simultaneously, at this moment i Z1The decline of starting from scratch, i Z2Drop to gradually minimum value.
Operation mode XII: shown in Fig. 2 (1), the second power triple-pole switch pipe S 2Conducting, the first power triple-pole switch pipe S 1, the 3rd power triple-pole switch pipe S 3, the 4th power triple-pole switch pipe S 4Cut-off, the first power frequency power triple-pole switch pipe S 5Conducting, the second power frequency power triple-pole switch pipe S 6Cut-off, i Z2By the 4th sustained diode 4Afterflow is risen, and full bridge inverter 1,2 is worked simultaneously, i Z1Continue to descend.
Operation mode XIII: shown in Fig. 2 (m), the second power triple-pole switch pipe S 2Conducting, the first power triple-pole switch pipe S 1, the 3rd power triple-pole switch pipe S 3, the 4th power triple-pole switch pipe S 4Cut-off, the first power frequency power triple-pole switch pipe S 5Conducting, the second power frequency power triple-pole switch pipe S 6Cut-off is owing to i this moment Z2Oneself rises to zero, the 4th sustained diode 4Cut-off, full bridge inverter 1 works independently, i Z1Continue to descend.
4. operation interval 4:
Operation mode XIV: shown in Fig. 2 (n), because dead band time setting shorter, so the first power triple-pole switch pipe S 1, the second power triple-pole switch pipe S 2, the 3rd power triple-pole switch pipe S 3, the 4th power triple-pole switch pipe S 4, the first power frequency power triple-pole switch pipe S 5, the second power frequency power triple-pole switch pipe S 6All be in cut-off state, circuit wouldn't be worked, i Z1, i Z1Be zero.
For realizing above operation principle, adopt control program as shown in Figure 3: output voltage u oWith voltage reference u rObtain current reference i through the computing of Voltage loop adjuster rInductive current i L1～i L4With current reference i rObtain pwm signal through comparator, latch computing.This pwm signal obtains drv by drive circuit after obtaining the driving signal of the first～the 4th power triple-pole switch pipe through logical operation 1, drv 2, drv 3, drv 4, drive respectively the first～the 4th power triple-pole switch pipe S 1～S 4Voltage reference u rThrough obtaining first, second power frequency power triple-pole switch pipe S behind zero balancing, dead-zone circuit, the drive circuit 5, S 6Driving signal drv 5, drv 6
As seen from the above description, the present invention is a kind of crisscross parallel type three-level double step-down full bridge inverter of realizing the zero current turning-on invert function, and this inverter has following advantage:
1. need not introduce resonant circuit, auxiliary switch, can realize the zero current turning-on of inverter main switch, and control is simple;
2. along with the introducing of interleaving technique, so that this inverter volume becomes less, is more suitable in large-power occasions;
3. output current harmonics content is little.

Claims (1)

1. crisscross parallel type three-level double step-down full bridge inverter, comprise the first full bridge inverter (1), the second full bridge inverter (2), power frequency commutating circuit (3) and load circuit (4), it is characterized in that the first power triple-pole switch pipe (S 1) drain electrode be connected with the positive pole of external power supply (U); The first power triple-pole switch pipe (S 1) source electrode and the first fly-wheel diode (D 1) negative electrode, be connected to the first output inductor (L 1) an end; The first fly-wheel diode (D 1) anode, be connected to the negative pole of external power supply (U); The second power triple-pole switch pipe (S 2) source electrode be connected with the negative pole of external power supply (U); The second power triple-pole switch pipe (S 2) drain electrode and the second fly-wheel diode (D 2) anode, be connected to the second output inductor (L 2) an end; The second fly-wheel diode (D 2) negative electrode, be connected to the positive pole of external power supply (U); The 3rd power triple-pole switch pipe (S 3) drain electrode be connected with the positive pole of external power supply (U); The 3rd power triple-pole switch pipe (S 3) source electrode and the 3rd fly-wheel diode (D 3) negative electrode, be connected to the 3rd output inductor (L 3) an end; The 3rd fly-wheel diode (D 3) anode, be connected to the negative pole of external power supply (U); The 4th power triple-pole switch pipe (S 4) source electrode be connected with the negative pole of external power supply (U); The 4th power triple-pole switch pipe (S 4) drain electrode and the 4th fly-wheel diode (D 4) anode, be connected to the 4th output inductor (L 4) an end; The 4th fly-wheel diode (D 4) negative electrode, be connected to the positive pole of external power supply (U); The first output inductor (L 1), the second output inductor (L 2), the 3rd output inductor (L 3), the 4th output inductor (L 4) the other end be connected to output filter capacitor (C f) the upper end; The first power frequency power triple-pole switch pipe (S 5) drain electrode be connected with the positive pole of external power supply (U); The first power frequency power triple-pole switch pipe (S 5) source electrode and the second power frequency power triple-pole switch pipe (S 6) drain electrode, be connected to output filter capacitor (C f) the lower end; The second power frequency power triple-pole switch pipe (S 6) source electrode be connected with the negative pole of external power supply (U); Load resistance (R) is connected in parallel on output filter capacitor (C f) two ends.
CN2012102160646A 2012-06-28 2012-06-28 Staggered parallel-type three-level dual-buck full-bridge inverter Pending CN102891619A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103812370A (en) * 2012-11-09 2014-05-21 江苏绿扬电子仪器集团有限公司 Multi-level full-bridge inverter
TWI508424B (en) * 2013-10-11 2015-11-11 Delta Electronics Inc Solar photovoltaic power conversion system and method of operating the same

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Publication number Priority date Publication date Assignee Title
US5889668A (en) * 1997-09-05 1999-03-30 Electric Power Research Institute, Inc. Three-phase DC-to-AC power inverter with three-level poles
CN1595782A (en) * 2004-07-01 2005-03-16 南京航空航天大学 Double output double step-down type half bridge inverter, and control and modulation method
CN1967998A (en) * 2006-10-20 2007-05-23 南京航空航天大学 Three-level double step-down full bridge inverter
CN101145740A (en) * 2007-10-29 2008-03-19 南京航空航天大学 Coupling inductance dual-buck full bridge inverter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5889668A (en) * 1997-09-05 1999-03-30 Electric Power Research Institute, Inc. Three-phase DC-to-AC power inverter with three-level poles
CN1595782A (en) * 2004-07-01 2005-03-16 南京航空航天大学 Double output double step-down type half bridge inverter, and control and modulation method
CN1967998A (en) * 2006-10-20 2007-05-23 南京航空航天大学 Three-level double step-down full bridge inverter
CN101145740A (en) * 2007-10-29 2008-03-19 南京航空航天大学 Coupling inductance dual-buck full bridge inverter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103812370A (en) * 2012-11-09 2014-05-21 江苏绿扬电子仪器集团有限公司 Multi-level full-bridge inverter
TWI508424B (en) * 2013-10-11 2015-11-11 Delta Electronics Inc Solar photovoltaic power conversion system and method of operating the same
US9300225B2 (en) 2013-10-11 2016-03-29 Delta Electronics, Inc. Solar photovoltaic power conversion system and method of operating the same

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Application publication date: 20130123