CN102969898B - Low-voltage wide-input three-level full-bridge converter and control method thereof - Google Patents
Low-voltage wide-input three-level full-bridge converter and control method thereof Download PDFInfo
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- CN102969898B CN102969898B CN201210498666.5A CN201210498666A CN102969898B CN 102969898 B CN102969898 B CN 102969898B CN 201210498666 A CN201210498666 A CN 201210498666A CN 102969898 B CN102969898 B CN 102969898B
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Abstract
The invention discloses a low-voltage wide-input three-level full-bridge converter and a control method thereof. The converter is composed of an input voltage-dividing capacitor circuit, a three-level branch circuit, a first bridge arm branch circuit, a second bridge arm branch circuit, an isolation transformer, a rectifier bridge and a filter circuit. The control method in characterized in that switch signals of fifth and sixth power switch tubes are obtained after switch signals of first and second power switch tubes pass through a disjunction gate or an inverter orderly, and the fifth power switch tube and the sixth power switch tube are conducted and cut off at the same time; in a three-level work mode, a third power switch tube and a fourth power switch tube are complementarily conducted at 180 degrees, and the first power switch tube and the second power switch tube are subjected to PWM (pulse width modulation); and in a two-level work mode, the first power switch tube and the second power switch tube are normally cut off, the fifth power switch tube and the sixth power switch tube are normally conducted, and the third power switch tube and the fourth power switch tube carry out PWM work. The low-voltage wide-input three-level full-bridge converter is suitable for a low-voltage wide-input occasion; and a high-frequency component for outputting a rectified waveform is small, and thus the size and the weight of an output filter are reduced.
Description
Technical field
The present invention relates to a kind of DC converter and control method thereof of electrical energy changer, relate in particular to wide input three levels full-bridge converters of a kind of low pressure and control method thereof.
Background technology
Along with the continuous aggravation of the continuous in short supply and environmental pollution of fossil energy, the distributed generation system based on new and renewable sources of energy has become the focus of present research, and straight convertor is one of them important component part.And new and renewable sources of energy, as: fuel cell, photovoltaic cell etc., output voltage changes with the variation of load and environment, and excursion is wider.Occasion at wide input voltage, the high fdrequency component of tradition two levels full-bridge converter output rectified waveforms is large, thereby cause that output filter volume is large, Heavy Weight, and traditional three levels full-bridge converters are owing to can being operated in three level and 2 kinds of mode of operations of two level, reduce the high fdrequency component of output rectified waveform, be suitable for the occasion of wide input voltage.But traditional three levels full-bridge converters need 8 power switch pipes, 2 clamping diodes and 1 clamping capacitance, and power device quantity is many, and cost is high, and circuit is complicated.Invention [200810234962.8] has proposed a kind of low voltage wide input push-pull ortho-exciting three-level DC inverter and control method thereof, only need 6 power switch pipes, reduced the quantity of power device, the high fdrequency component of output rectified waveform is little, but also need 2 former limit windings and 1 clamping capacitance, its cost is still very large.
Summary of the invention
The technical problem to be solved in the present invention is that the defect existing for prior art proposes wide input three levels full-bridge converters of a kind of low pressure and control method thereof.
Wide input three levels full-bridge converters of low pressure of the present invention, comprise input dividing potential drop condenser network, the first arm path, the second arm path, isolating transformer and current rectifying and wave filtering circuit, wherein input dividing potential drop condenser network and comprise input power, the first input dividing potential drop electric capacity and the second input dividing potential drop electric capacity, the first arm path comprises the first power switch pipe and the second power switch pipe, the second arm path comprises the 3rd power switch pipe and the 4th power switch pipe, isolating transformer comprises former limit winding and secondary winding, current rectifying and wave filtering circuit comprises i.e. the first rectifier diode to the four rectifier diodes of four rectifier diodes, filter inductance and filter capacitor, the anode that the positive pole of input power connects the first input dividing potential drop electric capacity forms the positive output end of inputting dividing potential drop condenser network, the negative terminal that the negative pole of input power connects the second input dividing potential drop electric capacity forms the negative output terminal of inputting dividing potential drop condenser network, and the anode that the negative terminal of the first input dividing potential drop electric capacity connects the second input dividing potential drop electric capacity forms the middle-end of inputting dividing potential drop condenser network, the drain electrode of the first power switch pipe connects the positive output end of input dividing potential drop condenser network, and the source electrode of the second power switch pipe connects the negative output terminal of input dividing potential drop condenser network, the drain electrode of the 3rd power switch pipe connects the positive output end of input dividing potential drop condenser network, and the source electrode of the 4th power switch pipe connects the negative output terminal of input dividing potential drop condenser network, the Same Name of Ends of the former limit winding of isolating transformer connects respectively the drain electrode of source electrode and second power switch pipe of the first power switch pipe, the different name end of the former limit winding of isolating transformer connects respectively the drain electrode of source electrode and the 4th power switch pipe of the 3rd power switch pipe, the Same Name of Ends of the secondary winding of isolating transformer connects respectively the anode of the first rectifier diode and the negative electrode of the second rectifier diode, and the different name end of the secondary winding of isolating transformer connects respectively the anode of the 3rd rectifier diode and the negative electrode of the 4th rectifier diode, the negative electrode of the first rectifier diode connects respectively the 3rd negative electrode of rectifier diode and the input of filter inductance, the anode of the output termination filter capacitor of filter inductance, the negative terminal of filter capacitor connects the anode of the 4th rectifier diode and the anode of the second rectifier diode, the negative electrode of the second rectifier diode connects the anode of the first rectifier diode, and the negative electrode of the 4th rectifier diode connects the anode of the 3rd rectifier diode,
Also comprise three level branch roads, described three level branch roads comprise the 5th power switch pipe and the 6th power switch pipe; The drain electrode of the 5th power switch pipe connects the middle-end of input dividing potential drop condenser network, and the source electrode of the 5th power switch pipe connects the source electrode of the 6th power switch pipe, and the drain electrode of the 6th power switch pipe connects the Same Name of Ends of the former limit winding of isolating transformer.
The control method of wide input three levels full-bridge converters of low pressure, by the output voltage of wide input three levels full-bridge converters of low pressure of sampling and given reference voltage adjusted signal after Voltage loop adjuster; The first sawtooth waveforms carrier signal that saw-toothed wave generator is produced obtains the second sawtooth waveforms carrier signal through DC bias circuit;
When wide input three levels full-bridge converters of low pressure are in three level modes, by described conditioning signal and the first sawtooth waveforms carrier signal successively through the first comparator, the first logic switch produces the switching signal that circuit obtains respectively the 3rd power switch pipe and the 4th power switch pipe, the switching signal of the 3rd power switch pipe is obtained to the driving signal of the 3rd power switch pipe through the 3rd drive circuit, the switching signal of the 4th power switch pipe is obtained to the driving signal of the 4th power switch pipe through the 4th drive circuit, the driving signal of the driving signal of described the 3rd power switch pipe and the 4th power switch pipe is i.e. the 3rd power switch pipe and 180 ° of complementary conductings shutoffs of the 4th power switch pipe of 180 ° of complementary signals, by described conditioning signal and the second sawtooth waveforms carrier signal successively through the second comparator, the second logic switch produces the switching signal that circuit obtains respectively the first power switch pipe and the second power switch pipe, the PWM driving signal that the switching signal of the first power switch pipe is obtained to the first power switch pipe through the first drive circuit is that the first power switch pipe is PWM modulation, the PWM driving signal that the switching signal of the second power switch pipe is obtained to the second power switch pipe through the second drive circuit is that the second power switch pipe is PWM modulation, the switching signal of the switching signal of the first power switch pipe and the second power switch pipe is passed through respectively or door, inverter and the 5th drive circuit obtain driving signal and the 5th power switch pipe and the 6th power switch pipe conducting simultaneously shutoff of the 5th power switch pipe and the 6th power switch pipe,
When wide input three levels full-bridge converters of low pressure are in two level modes, by described conditioning signal and the first sawtooth waveforms carrier signal successively through the first comparator, the first logic switch produces the switching signal that circuit obtains respectively the 3rd power switch pipe and the 4th power switch pipe, the PWM driving signal that the switching signal of the 3rd power switch pipe is obtained to the 3rd power switch pipe through the 3rd drive circuit is that the 3rd power switch pipe is PWM modulation, the PWM driving signal that the switching signal of the 4th power switch pipe is obtained to the 4th power switch pipe through the 4th drive circuit is that the 4th power switch pipe is PWM modulation, by described conditioning signal and the second sawtooth waveforms carrier signal successively through the second comparator, the second logic switch produces the switching signal that circuit obtains respectively the first power switch pipe and the second power switch pipe, the low level that the switching signal of the first power switch pipe is obtained to the first power switch pipe through the first drive circuit drives i.e. the first power switch pipe normal off of signal, the low level that the switching signal of the second power switch pipe is obtained to the second power switch pipe through the second drive circuit drives i.e. the second power switch pipe normal off of signal, the switching signal of the switching signal of the first power switch pipe and the second power switch pipe is passed through respectively or door, the high level that inverter and the 5th drive circuit obtain the 5th power switch pipe and the 6th power switch pipe drives signal i.e. the 5th power switch pipe and the 6th power switch pipe normal open.
Wide input three levels full-bridge converters of low pressure and control method thereof that the present invention proposes, compare with low voltage wide input push-pull ortho-exciting three-level DC inverter and control method thereof in invention [200810234962.8], mainly contain 4 differences: the one, former limit winding becomes 1 from original 2, has reduced the volume and weight of transformer; The 2nd, saved clamping capacitance, reduced the cost of system; The 3rd, same brachium pontis power switch pipe voltage stress is identical, is easy to choose and heat dissipation design; The 4th, reduced by 1 drive circuit, reduced cost, improved efficiency.
Accompanying drawing explanation
Fig. 1: circuit topology figure of the present invention;
Fig. 2: control principle drawing of the present invention;
Fig. 3: the main waveform schematic diagram of the present invention's three level mode of operation;
Fig. 4: the main waveform schematic diagram of the present invention's two level mode of operation;
Fig. 5: switch mode 1 equivalent circuit structure schematic diagram under the present invention's three level mode of operations and two level mode of operations;
Fig. 6: switch mode 2 equivalent circuit structure schematic diagrames under the present invention's three level mode of operations;
Fig. 7: switch mode 2 equivalent circuit structure schematic diagrames under the present invention's two level mode of operations.
Main designation in figure: U
in: input power, C
1, C
2: first, second input dividing potential drop electric capacity, S
1～S
6: the first to the 6th power switch pipe, D
s1～D
s6: the anti-paralleled diode of each power switch pipe, N
p, N
s: the former limit winding of isolating transformer and secondary winding, D
1～D
4: first to fourth output rectifier diode, L
f: filter inductance, C
f: filter capacitor, R
l: load, U
o: output voltage, u
aB: A and B point-to-point transmission voltage, i
l: filter inductance electric current, u
d1: the voltage that the first rectifier diode bears, u
dS1: the voltage between the first power switch pipe drain-source utmost point, u
dS4: the voltage between the 4th power switch pipe drain-source utmost point, u
dS5: the voltage between the 5th power switch pipe drain-source utmost point, u
dS6: the voltage between the 6th power switch pipe drain-source utmost point.
Embodiment
As shown in Figure 1.Wide input three levels full-bridge converters of low pressure, comprise input dividing potential drop condenser network 1, the first arm path 3, the second arm path 4, isolating transformer 5 and current rectifying and wave filtering circuit 6, wherein input dividing potential drop condenser network 1 and comprise input power U
in, the first input dividing potential drop capacitor C
1with the second input dividing potential drop capacitor C
2, the first arm path 3 comprises the first power switch tube S
1with the second power switch tube S
2, the second arm path 4 comprises the 3rd power switch tube S
3with the 4th power switch tube S
4, isolating transformer 5 comprises former limit winding N
pwith secondary winding N
s, current rectifying and wave filtering circuit 6 comprises i.e. the first rectifier diode D of four rectifier diodes
1to the 4th rectifier diode D
4, filter inductance L
fwith filter capacitor C
f; Input power U
inpositive pole connect the first input dividing potential drop capacitor C
1anode form the positive output end of input dividing potential drop condenser network 1, input power U
innegative pole connect the second input dividing potential drop capacitor C
2negative terminal form the negative output terminal of input dividing potential drop condenser network 1, the first input dividing potential drop capacitor C
1negative terminal connect the second input dividing potential drop capacitor C
2anode form the middle-end of input dividing potential drop condenser network 1; The first power switch tube S
1drain electrode connect the positive output end of input dividing potential drop condenser network 1, the second power switch tube S
2source electrode connect the negative output terminal of input dividing potential drop condenser network 1; The 3rd power switch tube S
3drain electrode connect the positive output end of input dividing potential drop condenser network 1, the 4th power switch tube S
4source electrode connect the negative output terminal of input dividing potential drop condenser network 1; The former limit winding N of isolating transformer
psame Name of Ends connect respectively the first power switch tube S
1source electrode and the second power switch tube S
2drain electrode, the former limit winding N of isolating transformer
pdifferent name end connect respectively the 3rd power switch tube S
3source electrode and the 4th power switch tube S
4drain electrode, the secondary winding N of isolating transformer
ssame Name of Ends meet respectively the first rectifier diode D
1anode and the second rectifier diode D
2negative electrode, the secondary winding N of isolating transformer
sdifferent name end meet respectively the 3rd rectifier diode D
3anode and the 4th rectifier diode D
4negative electrode; The first rectifier diode D
1negative electrode meet respectively the 3rd rectifier diode D
3negative electrode and filter inductance L
finput, filter inductance L
foutput termination filter capacitor C
fanode, filter capacitor C
fnegative terminal meet the 4th rectifier diode D
4anode and the second rectifier diode D
2anode, the second rectifier diode D
2negative electrode meet the first rectifier diode D
1anode, the 4th rectifier diode D
4negative electrode meet the 3rd rectifier diode D
3anode;
Also comprise three level branch roads 2, described three level branch roads 2 comprise the 5th power switch tube S
5with the 6th power switch tube S
6; The 5th power switch tube S
5drain electrode connect the middle-end of input dividing potential drop condenser network 1, the 5th power switch tube S
5source electrode connect the 6th power switch tube S
6source electrode, the 6th power switch tube S
6drain electrode meet the former limit winding N of isolating transformer
psame Name of Ends.
As shown in Figure 2, the control method of wide input three levels full-bridge converters of described low pressure, by the output voltage U of wide input three levels full-bridge converters of low pressure of sampling
owith given reference voltage U
radjusted signal U after Voltage loop adjuster
e; The first sawtooth waveforms carrier signal that saw-toothed wave generator is produced obtains the second sawtooth waveforms carrier signal through DC bias circuit;
When wide input three levels full-bridge converters of low pressure are in three level modes, by described conditioning signal U
ethrough the first comparator, the first logic switch, produce circuit successively with the first sawtooth waveforms carrier signal and obtain respectively the 3rd power switch tube S
3with the 4th power switch tube S
4switching signal, by the 3rd power switch tube S
3switching signal through the 3rd drive circuit, obtain the 3rd power switch tube S
3driving signal, by the 4th power switch tube S
4switching signal through the 4th drive circuit, obtain the 4th power switch tube S
4driving signal, described the 3rd power switch tube S
3driving signal and the 4th power switch tube S
4driving signal be i.e. the 3rd power switch tube S of 180 ° of complementary signals
3with the 4th power switch tube S
4180 ° of complementary conductings are turn-offed; By described conditioning signal U
ethrough the second comparator, the second logic switch, produce circuit successively with the second sawtooth waveforms carrier signal and obtain respectively the first power switch tube S
1with the second power switch tube S
2switching signal, by the first power switch tube S
1switching signal through the first drive circuit, obtain the first power switch tube S
1pWM drive i.e. the first power switch tube S of signal
1for PWM modulation, by the second power switch tube S
2switching signal through the second drive circuit, obtain the second power switch tube S
2pWM drive i.e. the second power switch tube S of signal
2for PWM modulation, by the first power switch tube S
1switching signal and the second power switch tube S
2switching signal respectively through or door, inverter and the 5th drive circuit obtain the 5th power switch tube S
5with the 6th power switch tube S
6driving signal and the 5th power switch tube S
5with the 6th power switch tube S
6conducting is simultaneously turn-offed;
When wide input three levels full-bridge converters of low pressure are in two level modes, by described conditioning signal U
ethrough the first comparator, the first logic switch, produce circuit successively with the first sawtooth waveforms carrier signal and obtain respectively the 3rd power switch tube S
3with the 4th power switch tube S
4switching signal, by the 3rd power switch tube S
3switching signal through the 3rd drive circuit, obtain the 3rd power switch tube S
3pWM drive i.e. the 3rd power switch tube S of signal
3for PWM modulation, by the 4th power switch tube S
4switching signal through the 4th drive circuit, obtain the 4th power switch tube S
4pWM drive i.e. the 4th power switch tube S of signal
4for PWM modulation; By described conditioning signal U
ethrough the second comparator, the second logic switch, produce circuit successively with the second sawtooth waveforms carrier signal and obtain respectively the first power switch tube S
1with the second power switch tube S
2switching signal, by the first power switch tube S
1switching signal through the first drive circuit, obtain the first power switch tube S
1low level drive i.e. the first power switch tube S of signal
1normal off, by the second power switch tube S
2switching signal through the second drive circuit, obtain the second power switch tube S
2low level drive i.e. the second power switch tube S of signal
2normal off, by the first power switch tube S
1switching signal and the second power switch tube S
2switching signal respectively through or door, inverter and the 5th drive circuit obtain the 5th power switch tube S
5with the 6th power switch tube S
6high level drive i.e. the 5th power switch tube S of signal
5with the 6th power switch tube S
6normal open.
The wide input three levels full-bridge converter main circuits of applicable low pressure of the present invention form by inputting dividing potential drop condenser network 1, three level branch roads 2, the first arm path 3, the second arm path 4, isolating transformer 5, rectifier bridge and filter circuit 6.Wherein, dividing potential drop capacitor C
1and C
2capacity is very large and equal, and its voltage is input power U
inhalf of voltage U, i.e. U
c1=U
c2=U/2, can regard the voltage source that voltage is U/2 as.
Control method is as follows: do not consider the dead band between power switch pipe, the switching time of time delay and power switch pipe, the first power switch pipe switching signal and the second power switch pipe switching signal successively through or door and inverter obtains the 5th, the switching signal and the 5th of the 6th power switch pipe, the 6th power switch pipe conducting simultaneously shutoff.There are three level and 2 kinds of mode of operations of two level, when in three level mode of operations, the 3rd power switch tube S
3with the 4th power switch tube S
4180 ° of complementary conductings, the first power switch tube S
1with the second power switch tube S
2with PWM working method, carry out work; When in two level mode of operations, the first power switch tube S
1with the second power switch tube S
2normal off is that duty ratio is 0, the five power switch tube S
5with the 6th power switch tube S
6normal open is that duty ratio is 1, the three power switch tube S
3with the 4th power switch tube S
4with PWM working method, carry out work.
Under three level mode of operations, the one the second power switch tube S
1and S
2there are two kinds of switching modes: a kind of is first, second power switch tube S
1and S
2respectively with the 4th, the 3rd power switch tube S
4and S
3turn-off, first there is 1/2 level in transformer secondary commutating voltage, rear appearance 1 level simultaneously; Another kind is first, second power switch tube S
1and S
2respectively with the 4th, the 3rd power switch tube S
4and S
3simultaneously open-minded, first there is 1 level in transformer secondary commutating voltage, rear appearance 1/2 level.
With the first power switch tube S
1and S
2switching mode be example, in conjunction with Fig. 5～Fig. 6, narrate the specific works principle under the present invention's three level modes.
Whole converter has 4 kinds of switch mode 1 switch periods as shown in Figure 3, is respectively [t
0[t in the past],
0, t
1], [t
1, t
2], [t
2, t
3], [t wherein
0in the past, t
1] be the front half period, [t
1, t
3] be the later half cycle.Below the working condition of each switch mode is made a concrete analysis of.
Before analyzing, make the following assumptions: 1. all power switch pipes and diode are desirable device, do not consider switching time, conduction voltage drop; 2. all inductance, electric capacity and transformer are ideal element, N
s/ N
p=n.
1 switch mode 1[t
0[corresponding to Fig. 5] in the past]
T
0in the past, the 4th, the 5th, the 6th power switch tube S
4, S
5, S
6conducting, other power switch pipe turn-offs.AB point-to-point transmission voltage is u
aB=nU/2.First, second power switch tube S
1and S
2the voltage bearing is all U/2, the 3rd power switch tube S
3the voltage bearing is U.Secondary the one or four rectifier diode D
1and D
4conducting, second, third rectifier diode D
2and D
3cut-off.Former limit is to secondary transferring energy.
2. switch mode 2[t
0, t
1] [corresponding to Fig. 6]
T
0constantly turn-off the 5th, the 6th power switch tube S
5and S
6, the first power switch tube S
1conducting, the 4th power switch tube S
4maintain conducting.The 5th power switch tube S
5anti-paralleled diode D
s5conducting, the 6th power switch tube S
6the voltage bearing is U/2, second, third power switch tube S
2and S
3the voltage bearing is all U.U
aBvoltage rises to nU.Former limit is to secondary transferring energy.
After this 3rd, the 5th, the 6th power switch tube S
3, S
5, S
6conducting, other power switch pipe turn-offs, and former limit provides energy to secondary.Converter starts second half cycling.
Under two level mode of operations, whole converter has 4 kinds of switch mode 1 switch periods as shown in Figure 4, is respectively [t
0[t in the past],
0, t
1], [t
1, t
2], [t
2, t
3], [t wherein
0in the past, t
1] be the front half period, [t
1, t
3] be the later half cycle.Below the working condition of each switch mode is made a concrete analysis of.
1 switch mode 1[t
0[corresponding to Fig. 5] in the past]
T
0in the past, with the switch mode 1 under three level modes.
2. switch mode 2[t
0, t
1] [corresponding to Fig. 7]
T
0constantly turn-off S
4, power switch tube S
1, S
2, S
3and S
4the voltage bearing is all U/2.U
aBvoltage drop arrives zero, secondary first to fourth rectifier diode D
1~ D
4conducting, secondary afterflow.
After this 3rd power switch tube S
3conducting, former limit provides energy to secondary.Converter starts second half cycling.
Claims (1)
1. the control method of wide input three levels full-bridge converters of low pressure, described full-bridge converter comprises input dividing potential drop condenser network (1), the first arm path (3), the second arm path (4), isolating transformer (5) and current rectifying and wave filtering circuit (6), wherein inputs dividing potential drop condenser network (1) and comprises input power (U
in), the first input dividing potential drop electric capacity (C
1) and the second input dividing potential drop electric capacity (C
2), the first arm path (3) comprises the first power switch pipe (S
1) and the second power switch pipe (S
2), the second arm path (4) comprises the 3rd power switch pipe (S
3) and the 4th power switch pipe (S
4), isolating transformer (5) comprises former limit winding (N
p) and secondary winding (N
s), current rectifying and wave filtering circuit (6) comprises i.e. the first rectifier diode (D of four rectifier diodes
1) to the 4th rectifier diode (D
4), filter inductance (L
f) and filter capacitor (C
f); Input power (U
in) positive pole connect the first input dividing potential drop electric capacity (C
1) anode form the positive output end of input dividing potential drop condenser network (1), input power (U
in) negative pole connect the second input dividing potential drop electric capacity (C
2) negative terminal form the negative output terminal of input dividing potential drop condenser network (1), the first input dividing potential drop electric capacity (C
1) negative terminal connect the second input dividing potential drop electric capacity (C
2) anode form the middle-end of input dividing potential drop condenser network (1); The first power switch pipe (S
1) drain electrode connect the positive output end of input dividing potential drop condenser network (1), the second power switch pipe (S
2) source electrode connect the negative output terminal of input dividing potential drop condenser network (1); The 3rd power switch pipe (S
3) drain electrode connect the positive output end of input dividing potential drop condenser network (1), the 4th power switch pipe (S
4) source electrode connect the negative output terminal of input dividing potential drop condenser network (1); The former limit winding (N of isolating transformer
p) Same Name of Ends meet respectively the first power switch pipe (S
1) source electrode and the second power switch pipe (S
2) drain electrode, the former limit winding (N of isolating transformer
p) different name end meet respectively the 3rd power switch pipe (S
3) source electrode and the 4th power switch pipe (S
4) drain electrode, the secondary winding (N of isolating transformer
s) Same Name of Ends meet respectively the first rectifier diode (D
1) anode and the second rectifier diode (D
2) negative electrode, the secondary winding (N of isolating transformer
s) different name end meet respectively the 3rd rectifier diode (D
3) anode and the 4th rectifier diode (D
4) negative electrode; The first rectifier diode (D
1) negative electrode meet respectively the 3rd rectifier diode (D
3) negative electrode and filter inductance (L
f) input, filter inductance (L
f) output termination filter capacitor (C
f) anode, filter capacitor (C
f) negative terminal meet the 4th rectifier diode (D
4) anode and the second rectifier diode (D
2) anode, the second rectifier diode (D
2) negative electrode meet the first rectifier diode (D
1) anode, the 4th rectifier diode (D
4) negative electrode meet the 3rd rectifier diode (D
3) anode;
Also comprise three level branch roads (2), described three level branch roads (2) comprise the 5th power switch pipe (S
5) and the 6th power switch pipe (S
6); The 5th power switch pipe (S
5) drain electrode connect input dividing potential drop condenser network (1) middle-end, the 5th power switch pipe (S
5) source electrode meet the 6th power switch pipe (S
6) source electrode, the 6th power switch pipe (S
6) drain electrode meet the former limit winding (N of isolating transformer
p) Same Name of Ends;
It is characterized in that described method is as follows: by the output voltage (U of wide input three levels full-bridge converters of low pressure of sampling
o) with given reference voltage (U
r) adjusted signal (U after Voltage loop adjuster
e); The first sawtooth waveforms carrier signal that saw-toothed wave generator is produced obtains the second sawtooth waveforms carrier signal through DC bias circuit;
When wide input three levels full-bridge converters of low pressure are in three level modes, by described conditioning signal (U
e) through the first comparator, the first logic switch generation circuit, obtain respectively the 3rd power switch pipe (S successively with the first sawtooth waveforms carrier signal
3) and the 4th power switch pipe (S
4) switching signal, by the 3rd power switch pipe (S
3) switching signal through the 3rd drive circuit, obtain the 3rd power switch pipe (S
3) driving signal, by the 4th power switch pipe (S
4) switching signal through the 4th drive circuit, obtain the 4th power switch pipe (S
4) driving signal, described the 3rd power switch pipe (S
3) driving signal and the 4th power switch pipe (S
4) driving signal be i.e. the 3rd power switch pipe (S of 180 ° of complementary signals
3) and the 4th power switch pipe (S
4) 180 ° of complementary conductings turn-off; By described conditioning signal (U
e) through the second comparator, the second logic switch generation circuit, obtain respectively the first power switch pipe (S successively with the second sawtooth waveforms carrier signal
1) and the second power switch pipe (S
2) switching signal, by the first power switch pipe (S
1) switching signal through the first drive circuit, obtain the first power switch pipe (S
1) PWM drive i.e. the first power switch pipe (S of signal
1) for PWM modulation, by the second power switch pipe (S
2) switching signal through the second drive circuit, obtain the second power switch pipe (S
2) PWM drive i.e. the second power switch pipe (S of signal
2) for PWM modulation, by the first power switch pipe (S
1) switching signal and the second power switch pipe (S
2) switching signal respectively through or door, inverter and the 5th drive circuit obtain the 5th power switch pipe (S
5) and the 6th power switch pipe (S
6) driving signal and the 5th power switch pipe (S
5) and the 6th power switch pipe (S
6) shutoff of conducting simultaneously;
When wide input three levels full-bridge converters of low pressure are in two level modes, by described conditioning signal (U
e) through the first comparator, the first logic switch generation circuit, obtain respectively the 3rd power switch pipe (S successively with the first sawtooth waveforms carrier signal
3) and the 4th power switch pipe (S
4) switching signal, by the 3rd power switch pipe (S
3) switching signal through the 3rd drive circuit, obtain the 3rd power switch pipe (S
3) PWM drive i.e. the 3rd power switch pipe (S of signal
3) for PWM modulation, by the 4th power switch pipe (S
4) switching signal through the 4th drive circuit, obtain the 4th power switch pipe (S
4) PWM drive i.e. the 4th power switch pipe (S of signal
4) be PWM modulation; By described conditioning signal (U
e) through the second comparator, the second logic switch generation circuit, obtain respectively the first power switch pipe (S successively with the second sawtooth waveforms carrier signal
1) and the second power switch pipe (S
2) switching signal, by the first power switch pipe (S
1) switching signal through the first drive circuit, obtain the first power switch pipe (S
1) low level drive i.e. the first power switch pipe (S of signal
1) normal off, by the second power switch pipe (S
2) switching signal through the second drive circuit, obtain the second power switch pipe (S
2) low level drive i.e. the second power switch pipe (S of signal
2) normal off, by the first power switch pipe (S
1) switching signal and the second power switch pipe (S
2) switching signal respectively through or door, inverter and the 5th drive circuit obtain the 5th power switch pipe (S
5) and the 6th power switch pipe (S
6) high level drive i.e. the 5th power switch pipe (S of signal
5) and the 6th power switch pipe (S
6) normal open.
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| CN201210498666.5A CN102969898B (en) | 2012-11-29 | 2012-11-29 | Low-voltage wide-input three-level full-bridge converter and control method thereof |
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| CN102969898B true CN102969898B (en) | 2014-07-16 |
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| CN103731057A (en) * | 2013-12-26 | 2014-04-16 | 安徽巨日华电新能源有限公司 | T-shaped three-level inverter |
| CN103888010A (en) * | 2014-03-26 | 2014-06-25 | 南京理工大学 | High-frequency isolated type three-level inverter based on push-pull converter |
| CN103856095A (en) * | 2014-03-26 | 2014-06-11 | 南京理工大学 | Full-bridge current-source high-frequency isolation-type three-level inverter |
| CN105119497A (en) * | 2015-09-29 | 2015-12-02 | 燕山大学 | Wide input range dual-bridge LLC resonant converter |
| CN105119496A (en) * | 2015-09-29 | 2015-12-02 | 燕山大学 | Wide input range three-level LLC resonant converter and level switching control method |
| CN105718703B (en) * | 2016-03-10 | 2019-01-18 | 盐城工学院 | A kind of modeling method of three-level converter |
| CN110429822B (en) * | 2019-08-07 | 2021-04-02 | 西北工业大学 | T-type LLC resonant converter and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1396697A (en) * | 2002-06-20 | 2003-02-12 | 南京航空航天大学 | Alternatively parallel three-level converter excited by positive voltage |
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| US6898093B2 (en) * | 2003-06-24 | 2005-05-24 | Toshiba International Corporation | Power conversion circuit with clamp and soft start |
| CN101388609B (en) * | 2008-11-05 | 2010-08-18 | 南京航空航天大学 | Low voltage wide input push-pull positive stimulate three level DC converter and controlling method thereof |
| CN102082515B (en) * | 2009-11-27 | 2013-01-23 | 南京理工大学 | High frequency isolated AC-AC mode three-level AC-AC converter based on flyback converter |
| CN101917133B (en) * | 2010-08-30 | 2012-08-22 | 南京航空航天大学 | Five-electrical level inverter |
| CN102361408A (en) * | 2011-10-20 | 2012-02-22 | 东南大学 | Non-isolated photovoltaic grid-connected inverter and switching control time sequence thereof |
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