CN1988348A - PWM combined three level DC converter for zero voltage current switch - Google Patents
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Abstract
A zero-voltage and zero-current switch PWM combined three-level DC converter is composed of an input bleeder capacitor, a semi-bridge three-level converter, a full-bridge converter, an isolation converter, a rectifier and filter circuit characterizing in combining a semi-bridge three-level converter and a full-bridge converter, the voltage stress of all switch tubes is half of input voltage, lamination of secondary voltages of a transformer can reduce the HF component in secondary rectifier voltage wave greatly so as to reduce output filter inductance and increase dynamic performance and realizes zero voltage and zero current switch in wide input voltage and wide load sphere.
Description
One, technical field
Pwm combined three level DC converter for zero voltage current switch of the present invention, the DC converter of genus transformation of electrical energy device.
Two, background technology
Flourish along with communication, computer industry in recent years, power-supply device has the important developing direction that better environmental-protecting performance has become power electronic technology.In order to obtain better environmental-protecting performance, wherein the very important point is exactly to reduce the harmonic pollution of power-supply device to AC network, and common way adopts power factor correction technology exactly.In, powerful high frequency switch power is generally three-phase 380VAC ± 20% input, the DC bus-bar voltage after the rectification is the highest will to be reached about 640V; If adopt the three-phase activity coefficient technology, DC bus-bar voltage can reach 760-800V usually, even can be up to last kilovolt, and the voltage stress of switching tube increases greatly in this just feasible back level DC converter, has brought difficulty for choosing of device.
The notion of three level and thought are to extend to come from three-level inverter at first, and are incorporated in the DC converter rapidly.This technology can reduce the voltage stress of switching tube in the converter by the quantity that increases switching tube, makes it the occasion that is applicable to that input voltage is high.The half-bridge three-level converter is one of isolated form three-level converter that proposes the earliest, and it is simple that it has a circuit structure, can realize soft switch, advantage such as switching frequency is constant, thereby be used widely.But under many occasions, input voltage is not only high, and scope is very wide, be input as 850 ~ 1250VDC as the DC power supply in the ship power distribution system, the DC power supply input in the electric locomotive is especially up to 1500 ~ 3000VDC, if adopt the half-bridge three-level converter under these occasions, its shortcoming is that output inductor is big, power density of transform is low, and dynamic response is slow, and can't keep high efficiency in whole input voltage range.
Three, summary of the invention
The objective of the invention is to develop a kind of Pwm combined three level DC converter for zero voltage current switch, make the voltage stress of all switching tubes be half of input voltage, reduce the high fdrequency component of secondary commutating voltage, reduce output filter, reduce the voltage stress of secondary rectifier diode, utilize transformer leakage inductance and output inductor in wide loading range, to realize the zero voltage switch of MOSFET, the blocking voltage source that utilization is connected on the former limit of transformer with the IGBT diode in series, in wide loading range, realize the Zero Current Switch of IGBT, improve the efficient of converter in whole input voltage range.
Pwm combined three level DC converter for zero voltage current switch of the present invention is combined by half-bridge three-level converter and full-bridge converter, the input dc bus two ends of half-bridge three-level converter are connected in the output of input dividing potential drop condenser network, two brachium pontis cross-over connections of full-bridge converter are in the striding capacitance two ends, two switching tubes (comprising two series diodes) and striding capacitance in two public half-bridge three-level converters of converter in the middle of the tri-level inversion brachium pontis.The end of the same name of the former limit of the isolating transformer of two converters winding all is connected in the mid point of tri-level inversion brachium pontis, and its different name end is connected in the mid point of input dividing potential drop electric capacity and the mid point of the other brachium pontis of full-bridge converter respectively.The secondary winding of two isolating transformers is connected mutually, and is connected in rectification and filter circuit.
Physical circuit comprises by being connected in parallel on the input dividing potential drop condenser network that the DC power supply positive and negative terminal is formed after two input dividing potential drop capacitances in series, isolating transformer, rectification and filter circuit, wherein the composition of rectification and filter circuit is, different name end after two secondary windings in series of first isolating transformer is connected in the end of the same name of second isolating transformer, the first secondary winding, the end of the same name of first isolating transformer, the first secondary winding is connected in the anode of the first rectifier diode DR1, the different name end of second isolating transformer, the second secondary winding is connected in the anode of second rectifier diode, after linking to each other, the negative electrode of two rectifier diodes is connected in the series circuit of filter inductance and filter capacitor, the other end of this series circuit is connected in the middle series connection point of first isolating transformer and middle two the secondary windings of second isolating transformer (T2), it is characterized in that, also comprise half-bridge three-level converter and full-bridge converter, the composition of described half-bridge three-level converter is, with first switching tube, first series diode, the first transistor, second series diode, after connecting successively, transistor seconds and second switch pipe be connected in parallel on input dividing potential drop condenser network positive-negative output end, between the series connection point that series circuit after two fly-wheel diodes are connected and striding capacitance all are connected in parallel on first switching tube and first series diode simultaneously and the series connection point of transistor seconds and second switch pipe, wherein the series connection point of two fly-wheel diodes is connected with the series connection point of two dividing potential drop electric capacity, be connected in the series connection point of the first transistor and second series diode after the parasitic leakage inductance in the former limit of termination of the same name first isolating transformer of the former limit of first isolating transformer winding, connect the series connection point of two fly-wheel diodes behind the different name end connection blocking capacitor, first switching tube and second switch pipe be paralleling switch body diode and switching tube parasitic capacitance separately; The composition of described full-bridge converter is between the series connection point with the 3rd switching tube and the series connection point that is connected in parallel on first switching tube in the half-bridge three-level converter inverter bridge leg and first series diode after the 4th switching tube is connected and transistor seconds and second switch pipe, and be connected in the striding capacitance two ends, be connected in the series connection point of the 3rd switching tube and the 4th switching tube after the parasitic leakage inductance in the former limit of different name termination second isolating transformer of the former limit of second isolating transformer winding, its the first transistor of half-bridge three-level converter and series connection point of second series diode of terminating at of the same name, the 3rd switching tube and the 4th switching tube be paralleling switch body diode and switching tube parasitic capacitance separately.
Another kind of circuit of the present invention is that blocking capacitor is moved in the full-bridge converter from the half-bridge three-level converter.
The present invention's major technique characteristics compared with prior art are, the voltage stress of all switching tubes is half of input voltage, are applicable to that high-voltage dc transmission goes into occasion; By two kinds of converters are reasonably made up, reduced the amplitude of secondary commutating voltage medium-high frequency component, and then reduced output filter significantly; Can reduce the voltage stress of secondary rectifier diode; Can in very wide input voltage and loading range, realize the zero voltage switch and the Zero Current Switch of switching tube, thereby reduce the switching tube switching loss, improve conversion efficiency.
Four, description of drawings
Accompanying drawing 1 and accompanying drawing 2 are Pwm combined three level DC converter for zero voltage current switch electrical block diagrams of the present invention
Accompanying drawing 3 is Pwm combined three level DC converter for zero voltage current switch main waveform schematic diagrames in three level mode of operations.
Accompanying drawing 4 is Pwm combined three level DC converter for zero voltage current switch main waveform schematic diagrames in two level mode of operations.
Accompanying drawing 5-15 is the equivalent circuit structure schematic diagram of each switch mode.
Main designation in the above-mentioned accompanying drawing: Vin, supply voltage.Cd1, Cd2, input dividing potential drop electric capacity.Q1, Q4, Q5, Q6, switching tube.C1, C4, C5, C6, switching tube parasitic capacitance.D1, D4, D5, D6, switching tube body diode.Q2, Q3, transistor.D2, D3, series diode.Df1, Df2, fly-wheel diode.Css, striding capacitance.Cb, blocking capacitor.T1, T2, isolating transformer.Llk1, Llk2, the parasitic leakage inductance in the former limit of transformer.DR1, DR2, secondary rectifier diode.Lf, filter inductance.Cf, filter capacitor.RLd, load.Vbridge, transformer secondary voltage sum.Vrect, secondary commutating voltage.Vo, output voltage.VAB, A and B point-to-point transmission voltage.VAC, A and C point-to-point transmission voltage.Vcb, blocking capacitor voltage.
Five, embodiment
1 and 2 narrations circuit of the present invention is formed structure with reference to the accompanying drawings.
The half-bridge three-level converter is made up of switching tube Q1, Q4, transistor Q2, Q3, sustained diode f1 and Df2, series diode D2 and D3, striding capacitance Css, blocking capacitor Cb, isolating transformer T1, wherein switching tube Q1, Q4 are MOSFET, and transistor Q2, Q3 are IGBT.Switching tube Q1, Q4 and transistor Q2, Q3 adopt phase shifting control, and switching tube Q1, Q4 are advance pipe, and transistor Q2, Q3 are the pipe that lags behind.The effect of striding capacitance Css is that the switching process with switching tube Q1, Q4 and transistor Q2, Q3 couples together, and when the converter steady operation, the voltage constant of capacitor C ss is Vin/2.Series diode D2 and D3 make IGBT can only folk prescription to flowing through electric current, the blocking capacitor effect is with transformer primary current reset-to-zero, its objective is the Zero Current Switch of realizing IGBT.
Full-bridge converter is made up of transistor Q2, Q3, switching tube Q5, Q6, series diode D2 and D3, striding capacitance Css and isolating transformer T2, and wherein switching tube Q5 and Q6 are MOSFET.These four switching tubes and transistor also adopt phase shifting control, and wherein switching tube Q5, Q6 are advance pipe, and transistor Q2, Q3 are the pipe that lags behind.
The secondary of two isolating transformers is connected mutually, and adopts way of full-wave rectification, and DR1, DR2 are the secondary rectifier diodes.Isolating transformer and current rectifying and wave filtering circuit all can adopt prior art.
Accompanying drawing 2 is that blocking capacitor Cb in the accompanying drawing 1 is moved in the full-bridge converter from the half-bridge three-level converter.
Concrete control method is as follows: when input voltage is low, the fixedly phase shifting angle δ of a reservation is arranged between switching tube Q1, Q4 and transistor Q2, the Q3, purpose is to realize the Zero Current Switch of IGBT under three level modes.But because δ is very little, the approximate full duty ratio work of half-bridge three-level converter, transistor Q2, Q3 and switching tube Q5, Q6 phase shift work are regulated output voltage by the phase shifting angle of regulating between them.Obtain the voltage vbridge of one five level after the secondary voltage overlapped in series with two transformers, voltage vrect and output voltage after the rectification are very approaching, and alternating current component is very little.Voltage vrect comprises three level: 1 level ((k1+k2) Vin/2), and intermediate level (k1Vin/2) and 0 level, wherein k1 and k2 are respectively the secondary former limit no-load voltage ratio of transformer T1 and T2, and claim this converter to be operated in three level modes this moment.
Along with the rising of input voltage, the phase shifting angle of full-bridge converter becomes greatly gradually, and pulsewidth narrows down thereupon, and when input voltage rose to a certain value, this phase shifting angle reached 180 ° of maximums, and the pulsewidth of full-bridge converter is zero, and output voltage is not provided.This moment, the half-bridge three-level converter began to carry out phase shifting control, regulated output voltage by the phase shifting angle between by-pass cock pipe Q1, Q4 and transistor Q2, the Q3.Under this mode of operation, voltage vrect is the voltage waveform (intermediate level and 0 level) of one or two level, and claim converter to be operated in two level modes this moment.
Under two level modes, transformer T2 does not provide output voltage, the independent transmitted power of transformer T1, therefore when designing transformer capacity, should make transformer T1 can be at input voltage the highest and whole power of full load transmission.When converter is operated in three level modes, the common transmitted power of transformer T1 and T2, when minimum input voltage, the output voltage maximum that transformer T2 provides, therefore minimum and full load can provide its required part power of bearing at input voltage need to make transformer T2.
Be example with the converter in the accompanying drawing 1 below, 3-15 narrates the concrete operation principle of Pwm combined three level DC converter for zero voltage current switch in conjunction with the accompanying drawings.By accompanying drawing 3 as can be known this converter switch periods in three level modes 14 kinds of switch mode are arranged, be respectively [t0 was in the past], [t0, t1], [t1, t2], [t2, t3], [t3, t4], [t4, t5], [t5, t6], [t6, t7], [t7, t8], [t8, t9], [t9, t10], [t10, t11], [t11, t12], [t12, t13], wherein, [t0 was in the past, t6] be the preceding half period, [t6, t13] is 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 switching tubes and diode are desirable device; 2. all inductance, electric capacity and transformer are ideal element; 3. striding capacitance Css is enough big, and its voltage is Vin/2 during stable state; 4. output inductor Lf is enough big, can be similar to think a constant-current source Io, and Io is a load current.
1. before the switch mode 1[t0] [corresponding to accompanying drawing 5]
T0 in the past, switching tube Q1, Q6 and transistor Q2 conducting, voltage vAB=vAC=Vin/2, energy is transmitted to secondary in former limit.Primary current ip1 gives blocking capacitor Cb charging, secondary rectifying tube DR1 conducting, and rectifying tube DR2 turn-offs.
2. switch mode 2[t0, t1] [corresponding to accompanying drawing 6]
T0 is on-off switching tube Q6 constantly, and primary current ip2 is transferred to capacitor C 5, the C6 branch road from switching tube Q6, gives capacitor C 6 chargings, capacitor C 5 discharges, and under the cushioning effect of capacitor C 5, C6, switching tube Q6 is approximately no-voltage and turn-offs.Because transformer leakage inductance and output inductor series connection, so primary current ip1 holding current Ip01 is constant, continues to give blocking capacitor Cb charging.The voltage linear of capacitor C 5 descends, and the voltage linear of capacitor C 6 rises.To t1 constantly, the voltage of capacitor C 6 rises to Vin/2, and the voltage of capacitor C 5 drops to zero, the conducting of diode D5 nature.
3. switch mode 3[t1, t2] [corresponding to accompanying drawing 7]
After the diode D5 conducting, in zero-bit, can no-voltage open switching tube Q5 this moment with the voltage clamp at switching tube Q5 two ends.Voltage vAC=0, voltage vAB still keep Vin/2 constant.Primary current ip1 continues to charge to blocking capacitor Cb.
4. switch mode 4[t2, t3] [corresponding to accompanying drawing 8]
In the t2 moment, switching tube Q1 turn-offs, and primary current ip1 gives capacitor C 1 charging, passes through capacitor C ss simultaneously to capacitor C 4 discharges, and voltage vAB descends, voltage vAC=0.Because it is that no-voltage is turn-offed that capacitor C 1, C4, switching tube Q1 are arranged.Current i p1 continues to capacitor C b charging, because capacitor C b appearance value is relatively large, and the t23 time is shorter, can be similar to think voltage vcb approximate constant during this period.To t3 constantly, the voltage of capacitor C 4 drops to zero, and the voltage of capacitor C 1 rises to Vin/2, the conducting of diode D4 nature.
5. switch mode 5[t3, t4] [corresponding to accompanying drawing 9]
After the diode D4 conducting, zero, can no-voltage open switching tube Q4 this moment with the voltage clamp of capacitor C 4.During this period, transistor Q2, switching tube Q4 conducting, voltage vAB=0, voltage vcb makes primary current ip1 and ip2 begin to reduce, primary current is not enough to provide load current, thereby two rectifier diodes conducting simultaneously of transformer secondary, transformer secondary short circuit in winding, the original edge voltage sum is zero.Voltage on the capacitor C b is added on the former limit leakage inductance Llk1 of transformer T1, supposes that blocking capacitor is enough big and leakage inductance is less, can think that blocking capacitor voltage remained unchanged in this period, and primary current ip1 and ip2 are linear to descend.
6. switch mode 6[t4, t5] [corresponding to accompanying drawing 10]
In the t4 moment, primary current ip1 and ip2 are decreased to zero, and attempt reverse increase, but owing to string among the transistor Q2 has diode, reverse current can not be produced, and current i p1 and ip2 are maintained zero.Turn-offing transistor Q2 in this process, owing to do not have electric current to flow through among the transistor Q2, is zero-current switching therefore.Two secondary rectifying tube conductings simultaneously still provide load current jointly.
7. switch mode 7[t5, t6] [corresponding to accompanying drawing 11]
T5 opens transistor Q3 constantly, because leakage inductance Llk1 has limited the climbing of primary current ip1, so transistor Q3 is a zero current turning-on.Primary current is started from scratch in the other direction, and linearity increases.Because primary current is not enough to provide load current, two rectifying tubes of secondary are conducting simultaneously still.At t6 constantly, primary current is increased to load current in the other direction.
8. switch mode 8[t6, t7] [corresponding to accompanying drawing 12]
From t6 constantly, former limit provides energy for load, and secondary rectifying tube DR1 turn-offs, all load current current-sharing over commutation pipe DR2, and converter enters the later half cycle, and working condition is similar to above-mentioned half period.
By accompanying drawing 4 as can be known converter in the next switch periods of two level modes, 10 kinds of switch mode are arranged, wherein, [t0 in the past, t4] is the preceding half period, [t4, t9] is the later half cycle.In the preceding half period, under the working condition and three level modes of [t0 in the past, t2] period [t1, the t4] period identical, no longer repeat here.Below to [t2, t5] in the period working condition of three switch mode make a concrete analysis of.
1. switch mode 1[t2, t3] [corresponding to accompanying drawing 13]
In the t2 moment, primary current ip1 and ip2 drop to zero, and the trend of reverse flow is arranged, but because the existence of series diode D2 makes primary current ip1 and ip2 remain on zero.The conducting simultaneously of two secondary rectifying tubes this moment, the load-sharing electric current.Turn-off transistor Q2 and switching tube Q5 at this moment in the section, they are zero-current switchings.
2. switch mode 2[t3, t4] [corresponding to accompanying drawing 14]
T3 opens transistor Q3 and switching tube Q6 constantly, because leakage inductance Llk1 and Llk2 have limited the climbing of primary current ip1 and ip2, so transistor Q3 and switching tube Q6 are zero current turning-on.Voltage vAB=-Vin/2, voltage vAC=0.Because primary current is not enough to provide load current, two rectifying tubes of secondary are conducting simultaneously still, with the secondary voltage pincers zero.Primary current is started from scratch in the other direction, and linearity increases.To t4 constantly, primary current is increased to the load current of conversion to former limit in the other direction.
3. switch mode 3[t4, t5] [corresponding to accompanying drawing 15]
From t4 constantly, former limit provides energy for load, and secondary rectifying tube DR1 turn-offs, all load current current-sharing over commutation pipe DR2, and converter enters the later half cycle, and working condition is similar to above-mentioned half period.
In the accompanying drawing 2 in the operation principle of converter and the accompanying drawing 1 converter basic identical.
Example of the present invention is as follows: input direct voltage: Vin=400 ~ 800V; Output dc voltage: Vo=54V; Output current: Io=20A; The secondary former limit of transformer T1 no-load voltage ratio: 0.169; The secondary former limit of transformer T2 no-load voltage ratio: 0.147; The former limit of transformer T1 leakage inductance: Llk1=2.6uH; The former limit of transformer T2 leakage inductance: Llk2=3uH; Blocking capacitor: Cb=0.1uF; Output inductor: Lf=13.6uH; Output filter capacitor: Cf=2200uF * 2; MOSFET (Q1, Q4, Q5, Q6): SPW20N60S5; IGBT (Q2, Q3): IXGH40N60C2D1; Fly-wheel diode (Df1, Df2): DSEI30-06A; Series diode (D2, D3): DSEP30-03A; Secondary rectifier diode (DR1, DR2): DSEP30-03A; Switching frequency: fs=100kHz.
As seen from the above description, the combined three-level DC converter of ZVT zero current PWM of the present invention's proposition has following advantage:
The voltage stress of all switching tubes is half of input voltage, so this converter is highly suitable for high input voltage Occasion;
Output commutating voltage waveform medium-high frequency component is little, can reduce output filter, and then the power of raising converter is close Spend, and improve the dynamic property of converter, make it be applicable to the occasion of wide input voltage range;
Can be under three level modes and two level modes switch operating, thereby the voltage that reduces the secondary commutation diode should Power;
Utilize the energy of transformer leakage inductance and output inductor in wide input voltage and wide loading range, to realize The ZVT of MOSFET;
Utilize blocking capacitor and series diode can in wide input voltage and wide loading range, realize the zero current of IGBT Switch.
Claims (2)
1, a kind of Pwm combined three level DC converter for zero voltage current switch, comprise by two input dividing potential drop electric capacity (Cd1, Cd2) be connected in parallel on the input dividing potential drop condenser network (1) that DC power supply (Vin) positive and negative terminal is formed after the series connection, isolating transformer (4), rectification and filter circuit (5), wherein the composition of rectification and filter circuit (5) is, different name end after two secondary windings in series of first isolating transformer (T1) is connected in the end of the same name of second isolating transformer (T2), the first secondary winding, the end of the same name of first isolating transformer, the first secondary winding is connected in the anode of the first rectification diode (DR1), the different name end of second isolating transformer, the second secondary winding is connected in the anode of second rectifier diode (DR2), two rectifier diode (DR1, DR2) after linking to each other, negative electrode is connected in the series circuit of filter inductance (Lf) and filter capacitor (Cf), the other end of this series circuit is connected in the middle series connection point of two secondary windings in the middle of first isolating transformer (T1) and second isolating transformer (T2), it is characterized in that, also comprise half-bridge three-level converter (2) and full-bridge converter (3), the composition of described half-bridge three-level converter (2) is, with first switching tube (Q1), first series diode (D2), the first transistor (Q2), second series diode (D3), after connecting successively, transistor seconds (Q3) and second switch pipe (Q4) be connected in parallel on input dividing potential drop condenser network (1) positive-negative output end, two fly-wheel diode (Df1, Df2) between the series connection point of the series circuit after the series connection and striding capacitance (Css) series connection point that all is connected in parallel on first switching tube (Q1) and first series diode (D2) simultaneously and transistor seconds (Q3) and second switch pipe (Q4), two fly-wheel diode (Df1 wherein, Df2) series connection point and two dividing potential drop electric capacity (Cd1, Cd2) series connection point is connected, be connected in the series connection point of the first transistor (Q2) and second series diode (D3) after termination of the same name first isolating transformer (T1) of the former limit of first isolating transformer (T1) the winding parasitic leakage inductance in former limit (Llk1), the different name end connects blocking capacitor (Cb) back and connects two fly-wheel diode (Df1, Df2) series connection point, first switching tube (Q1) and second switch pipe (Q4) be paralleling switch body diode and switching tube parasitic capacitance separately; The composition of described full-bridge converter (3) is between the series connection point with the 3rd switching tube (Q5) and the series connection point that is connected in parallel on first switching tube (Q1) in half-bridge three-level converter (2) inverter bridge leg and first series diode (D2) after the 4th switching tube (Q6) is connected and transistor seconds (Q3) and second switch pipe (Q4), and be connected in striding capacitance (Css) two ends, different name termination second isolating transformer (T2) of the former limit of second isolating transformer (T2) the winding parasitic leakage inductance in former limit (Llk2) back connects the series connection point of the 3rd switching tube (Q5) and the 4th switching tube (Q6), its end of the same name is connected in the first transistor (Q2) of half-bridge three-level converter (2) and the series connection point of second series diode (D3), and the 3rd switching tube (Q5) and the 4th switching tube (Q6) be paralleling switch body diode and switching tube parasitic capacitance separately.
2, a kind of Pwm combined three level DC converter for zero voltage current switch, comprise by two input dividing potential drop electric capacity (Cd1, Cd2) be connected in parallel on the input dividing potential drop condenser network (1) that DC power supply (Vin) positive and negative terminal is formed after the series connection, isolating transformer (4), rectification and filter circuit (5), wherein the composition of rectification and filter circuit (5) is, different name end after two secondary windings in series of first isolating transformer (T1) is connected in the end of the same name of second isolating transformer (T2), the first secondary winding, the end of the same name of first isolating transformer, the first secondary winding is connected in the anode of first rectifier diode (DR1), the different name end of second isolating transformer, the second secondary winding is connected in the anode of second rectifier diode (DR2), two rectifier diode (DR1, DR2) after linking to each other, negative electrode is connected in the series circuit of filter inductance (Lf) and filter capacitor (Cf), the other end of this series circuit is connected in the middle series connection point of two secondary windings in the middle of first isolating transformer (T1) and second isolating transformer (T2), it is characterized in that, also comprise half-bridge three-level converter (2) and full-bridge converter (3), the composition of described half-bridge three-level converter (2) is, with first switching tube (Q1), first series diode (D2), the first transistor (Q2), second series diode (D3), after connecting successively, transistor seconds (Q3) and second switch pipe (Q4) be connected in parallel on input dividing potential drop condenser network (1) positive-negative output end, two fly-wheel diode (Df1, Df2) between the series connection point of the series circuit after the series connection and striding capacitance (Css) series connection point that all is connected in parallel on first switching tube (Q1) and first series diode (D2) simultaneously and transistor seconds (Q3) and second switch pipe (Q4), two fly-wheel diode (Df1 wherein, Df2) series connection point and two dividing potential drop electric capacity (Cd1, Cd2) series connection point is connected, be connected in the series connection point of the first transistor (Q2) and second series diode (D3) after termination of the same name first isolating transformer (T1) of the former limit of first isolating transformer (T1) the winding parasitic leakage inductance in former limit (Llk1), the different name end connects two fly-wheel diode (Df1, Df2) series connection point, first switching tube (Q1) and second switch pipe (Q4) be paralleling switch body diode and switching tube parasitic capacitance separately; The composition of described full-bridge converter (3) is between the series connection point with the 3rd switching tube (Q5) and the series connection point that is connected in parallel on first switching tube (Q1) in half-bridge three-level converter (2) inverter bridge leg and first series diode (D2) after the 4th switching tube (Q6) is connected and transistor seconds (Q3) and second switch pipe (Q4), and be connected in striding capacitance (Css) two ends, different name termination second isolating transformer (T2) of the former limit of second isolating transformer (T2) the winding parasitic leakage inductance in former limit (Llk2) back connects the series connection point of the 3rd switching tube (Q5) and the 4th switching tube (Q6), its end of the same name is connected in the first transistor (Q2) of half-bridge three-level converter (2) and the series connection point of second series diode (D3) after connecting blocking capacitor (Cb), and the 3rd switching tube (Q5) and the 4th switching tube (Q6) be paralleling switch body diode and switching tube parasitic capacitance separately.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610098273XA CN100405727C (en) | 2006-12-08 | 2006-12-08 | PWM combined three level DC converter for zero voltage current switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610098273XA CN100405727C (en) | 2006-12-08 | 2006-12-08 | PWM combined three level DC converter for zero voltage current switch |
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Cited By (14)
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| CN101860244A (en) * | 2010-04-09 | 2010-10-13 | 南京航空航天大学 | Half-period control method of single-phase diode-clamped five-level half-bridge inverter |
| CN101588126B (en) * | 2009-06-24 | 2011-05-11 | 哈尔滨工业大学 | Wide load characteristic ZVZCS three-level DC-DC converter |
| CN101494419B (en) * | 2008-01-21 | 2011-05-18 | 许继集团有限公司 | High efficiency zero voltage, zero current whole bridge converter |
| CN101552568B (en) * | 2008-12-17 | 2011-10-19 | 南京航空航天大学 | Half-cycle control tri-level single-inductor dual buck half bridge inverter and control method thereof |
| CN102710138A (en) * | 2012-05-28 | 2012-10-03 | 西安爱科赛博电气股份有限公司 | Harmonic direct current converter with wide range and low ZVS (zero-voltage-switching) output |
| CN101662231B (en) * | 2009-09-09 | 2012-11-21 | 华东交通大学 | Realization method of zero-current switch of diode neutral point clamped inverting circuit |
| CN103151931A (en) * | 2013-01-30 | 2013-06-12 | 西安爱科赛博电气股份有限公司 | No-voltage no-current three-level inverters direct current converter circuit |
| CN103997240A (en) * | 2013-02-19 | 2014-08-20 | 罗伯特·博世有限公司 | Inverter system and driving method for an inverter system |
| CN106849673A (en) * | 2017-03-20 | 2017-06-13 | 东南大学 | A kind of zero current combined type resonance three-level DC converter and its control method |
| CN107612329A (en) * | 2017-09-23 | 2018-01-19 | 天津大学 | A kind of double half-bridge DC DC converters of isolated form Boost |
| CN108631604A (en) * | 2018-05-28 | 2018-10-09 | 瀚润特环保设备（江苏）有限公司 | A kind of environmental protection dual transformer type zero current resonance three-level DC converter |
| CN110277923A (en) * | 2019-06-19 | 2019-09-24 | 陕西科技大学 | A kind of soft switch in three electrical levels DC converter of Active control primary current shutdown |
| CN114900047A (en) * | 2022-04-20 | 2022-08-12 | 汕头大学 | Hybrid three-level direct current converter based on double-transformer structure |
| CN116054571A (en) * | 2022-12-31 | 2023-05-02 | 西南交通大学 | Alternating parallel three-level soft switch direct current boost converter |
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| US6349044B1 (en) * | 1999-09-09 | 2002-02-19 | Virginia Tech Intellectual Properties, Inc. | Zero voltage zero current three level dc-dc converter |
| US6353547B1 (en) * | 2000-08-31 | 2002-03-05 | Delta Electronics, Inc. | Three-level soft-switched converters |
| CN100353652C (en) * | 2004-10-13 | 2007-12-05 | 南京航空航天大学 | Combined type full-bridge three-level DC converter and full-bridge three-level DC converter |
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- 2006-12-08 CN CNB200610098273XA patent/CN100405727C/en not_active Expired - Fee Related
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| CN101494419B (en) * | 2008-01-21 | 2011-05-18 | 许继集团有限公司 | High efficiency zero voltage, zero current whole bridge converter |
| CN101552568B (en) * | 2008-12-17 | 2011-10-19 | 南京航空航天大学 | Half-cycle control tri-level single-inductor dual buck half bridge inverter and control method thereof |
| CN101588126B (en) * | 2009-06-24 | 2011-05-11 | 哈尔滨工业大学 | Wide load characteristic ZVZCS three-level DC-DC converter |
| CN101662231B (en) * | 2009-09-09 | 2012-11-21 | 华东交通大学 | Realization method of zero-current switch of diode neutral point clamped inverting circuit |
| CN101860244A (en) * | 2010-04-09 | 2010-10-13 | 南京航空航天大学 | Half-period control method of single-phase diode-clamped five-level half-bridge inverter |
| CN102710138A (en) * | 2012-05-28 | 2012-10-03 | 西安爱科赛博电气股份有限公司 | Harmonic direct current converter with wide range and low ZVS (zero-voltage-switching) output |
| CN103151931A (en) * | 2013-01-30 | 2013-06-12 | 西安爱科赛博电气股份有限公司 | No-voltage no-current three-level inverters direct current converter circuit |
| CN103997240A (en) * | 2013-02-19 | 2014-08-20 | 罗伯特·博世有限公司 | Inverter system and driving method for an inverter system |
| CN106849673A (en) * | 2017-03-20 | 2017-06-13 | 东南大学 | A kind of zero current combined type resonance three-level DC converter and its control method |
| CN107612329A (en) * | 2017-09-23 | 2018-01-19 | 天津大学 | A kind of double half-bridge DC DC converters of isolated form Boost |
| CN108631604A (en) * | 2018-05-28 | 2018-10-09 | 瀚润特环保设备（江苏）有限公司 | A kind of environmental protection dual transformer type zero current resonance three-level DC converter |
| CN108631604B (en) * | 2018-05-28 | 2020-06-16 | 瀚润特环保设备（江苏）有限公司 | Environment-friendly double-transformer type zero-current resonance three-level direct current converter |
| CN110277923A (en) * | 2019-06-19 | 2019-09-24 | 陕西科技大学 | A kind of soft switch in three electrical levels DC converter of Active control primary current shutdown |
| CN114900047A (en) * | 2022-04-20 | 2022-08-12 | 汕头大学 | Hybrid three-level direct current converter based on double-transformer structure |
| CN116054571A (en) * | 2022-12-31 | 2023-05-02 | 西南交通大学 | Alternating parallel three-level soft switch direct current boost converter |
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| CN100405727C (en) | 2008-07-23 |
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Assignee: Dongguan Lide Electronic Co., Ltd. Assignor: Nanjing University of Aeronautics and Astronautics Contract fulfillment period: 2008.9.11 to 2015.9.11 contract change Contract record no.: 2009440001618 Denomination of invention: PWM combined three level DC converter for zero voltage current switch Granted publication date: 20080723 License type: Exclusive license Record date: 20091020 |
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