CN1988346A - PWM combined three level DC converter of Zero voltage switch - Google Patents
PWM combined three level DC converter of Zero voltage switch Download PDFInfo
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- CN1988346A CN1988346A CNA2006100982744A CN200610098274A CN1988346A CN 1988346 A CN1988346 A CN 1988346A CN A2006100982744 A CNA2006100982744 A CN A2006100982744A CN 200610098274 A CN200610098274 A CN 200610098274A CN 1988346 A CN1988346 A CN 1988346A
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Abstract
A zero-voltage switch PWM combined three-level DC converter is composed of an input bleeder capacitance circuit, a semi-bridge three-level converter, a full bridge converter, an isolation transformer and a rectifying and filtering circuit characterizing in including a semi-bridge three-level converter and a full bridge converter, the voltage stress of the switch tube is half of the input voltage, the HF component in the output rectified voltage wave is small, which reduces output filter inductance to realize zero voltage switch of the switch tube and reduce the voltage stress of a secondary rectifier tube, besides, transformer lead and lag clamp circuits are introduced in the original semi-bridge three level converter and a full bridge converter and the clamping diode is used to eliminate the voltage peak and vibration on the secondary rectifier tube so as to further reduce voltage stress of rectifier tubes.
Description
One, technical field
PWM combined three level DC converter of Zero voltage switch of the present invention and its modified model converter, the DC converter of genus transformation of electrical energy device.
Two, background technology
In recent years along with the further investigation to power electronic technology, people have proposed more and more stricter requirement to the power conversion unit that uses civil power with electricity quality.International Electrotechnical Commission has formulated standard IEC 61000-3-2, and harmonic content is limited.Electric device just is necessary to adopt power factor correction technology like this.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.
Three-level converter is the voltage stress that reduces 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 in input voltage height and the very wide occasion of scope, as DC power supply in the ship power distribution system and the DC power supply in the electric locomotive, its input voltage is up to last kilovolt, and the change in voltage scope of twice normally, if adopt the half-bridge three-level converter under these occasions, its shortcoming is that the output inductor volume is big, and power density of transform is low, dynamic response is slow, and can't keep high efficiency in whole input voltage range.In addition, the half-bridge three-level converter has just been realized the soft switch of main power tube, but still there is reverse-recovery problems in its secondary rectifying tube, oppositely recover to cause voltage oscillation, the secondary rectifying tube will bear due to voltage spikes, is easy to damage, and must take suitable method to eliminate.
Three, summary of the invention
The objective of the invention is at high pressure input occasion, develop a kind of PWM combined three level DC converter of Zero voltage switch, make the voltage stress of all switching tubes be half of input voltage, and can reduce the high fdrequency component of secondary commutating voltage, reduce the volume of output filter; Develop its modified model converter simultaneously,, reduce the loss on the secondary rectifying tube, improve conversion efficiency to eliminate secondary commutating voltage spike effectively.
PWM combined three level DC converter of Zero voltage 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 in two public half-bridge three-level converters of converter in the middle of the tri-level inversion brachium pontis and striding capacitance, the brachium pontis that two public switching tubes are formed is referred to as lagging leg.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 two 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 by the direction of end unanimity of the same name, and is connected in rectification and filter circuit.
Physical circuit comprises by being connected in parallel on input dividing potential drop condenser network, isolating transformer, rectification and the filter circuit of being formed at the positive and negative two ends of DC power supply after DC power supply and two dividing potential drop capacitances in series, wherein the composition of rectification and filter circuit is, four rectifier diodes are composed in series the two-way rectification circuit in twos.Positive-negative output end after this two-way rectification circuit parallel connection also connects output inductor and the series circuit of output filter capacitor formation loop.The series connection point of two rectifier diodes of first rectification circuit is connected in the end of the same name of the first isolating transformer secondary winding, and the series connection point of two diodes of second rectification circuit is connected in the different name end of the second isolating transformer secondary winding.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, the second switch pipe, after connecting successively, the 3rd switching tube and the 4th switching tube be attempted by input dividing potential drop condenser network positive-negative output end, between the series connection point that the series circuit of two fly-wheel diode forward series connection and striding capacitance all are connected in parallel on first switching tube and second switch pipe simultaneously and the series connection point of the 3rd switching tube and the 4th switching tube, wherein the series connection point of two fly-wheel diodes is connected with the series connection point of two dividing potential drop electric capacity, the end of the same name of the former limit of first isolating transformer winding is connected in the series connection point of second switch Guan Yudi three switching tubes, after the different name end connects the parasitic leakage inductance in the former limit of first isolating transformer; Be connected in the series connection point of two fly-wheel diodes, first switching tube, the second switch pipe, the 3rd switching tube and the 4th switching tube parasitic body diode in parallel separately and parasitic capacitance, the composition of described full-bridge converter is between the series connection point with the series connection point of the 5th switching tube and first switching tube that is connected in parallel on the half-bridge three-level converter after the 6th switching tube is connected and second switch pipe and the 3rd switching tube and the 4th switching tube, the different name end of the former limit of second isolating transformer winding connects the series connection point that is connected in the 5th switching tube and the 6th switching tube after the parasitic leakage inductance in the former limit of second isolating transformer, it is of the same name terminate at the half-bridge three-level converter second switch Guan Yudi three switching tubes series connection point and link to each other the 5th with the end of the same name of first isolating transformer, the 6 two switching tube comprises its parasitic body diode and parasitic capacitance.
Modified model converter of the present invention is that the clamped network that will be made up of resonant inductance, isolating transformer and clamping diode is incorporated in the PWM combined three level DC converter of Zero voltage switch, is specially:
(1) in the half-bridge three-level converter, resonant inductance is connected with isolating transformer, one end of resonant inductance is connected in the end of the same name of the former limit of first isolating transformer winding, the other end is connected in the series connection point of second switch Guan Yudi three switching tubes of half-bridge three-level converter, and be connected two clamping diodes of series connection mutually with resonant inductance intersection point place at the former limit of first isolating transformer winding, constitute clamped network, because the position of transformer is before resonant inductance, therefore be referred to as transformer advanced version clamped network, the converter after correspondingly claiming to improve is a transformer advanced version PWM combined three level DC converter of Zero voltage switch.Two clamping diodes are connected to the positive bus-bar and the negative busbar of converter direct current input, and its polarity is that the negative electrode of a diode Dc1 connects positive bus-bar, and the anode of another diode Dc2 connects negative busbar.
(2) in full-bridge converter, resonant inductance is connected with isolating transformer, one end of resonant inductance is connected in the series connection point of second switch Guan Yudi three switching tubes of half-bridge three-level converter, the other end is connected in the end of the same name of second isolating transformer, between direct current input positive and negative busbar, connect two clamping diodes of series connection mutually equally, because the position of transformer is after resonant inductance at this moment, therefore be referred to as transformer retarded type clamped network, the converter after correspondingly claiming to improve is a transformer retarded type PWM combined three level DC converter of Zero voltage switch.
The present invention's main feature compared with prior art is, the voltage stress of all switching tubes is half of input voltage, is applicable to that high-voltage dc transmission goes into occasion; Superpose by secondary voltage, reduced the amplitude of secondary commutating voltage medium-high frequency component, and then reduce the volume of output filter significantly two kinds of converters; Utilize output inductor and isolating transformer leakage inductance (or extra resonance inductance) and switching tube junction capacitance can realize the zero voltage switch of switching tube, thereby reduce the switching tube switching loss, improve conversion efficiency; Introduce clamped network, enlarged the loading range of switching tube realization zero voltage switch, voltage oscillation and due to voltage spikes that elimination causes because of the reverse recovery of secondary rectifying tube, thereby reduce the voltage stress of secondary rectifying tube, and reduced of the loss of secondary rectifying tube, improved conversion efficiency because of oppositely recovering to cause.
Four, description of drawings
Accompanying drawing 1 is a PWM combined three level DC converter of Zero voltage switch electrical block diagram of the present invention
Accompanying drawing 4-16 is the equivalent circuit structure schematic diagram of each switch mode.
Accompanying drawing 17 is transformer advanced version PWM combined three level DC converter of Zero voltage switch electrical block diagrams.
Accompanying drawing 19 is transformer advanced version PWM combined three level DC converter of Zero voltage switch main waveform schematic diagrames in three level mode of operations.
Accompanying drawing 20 is transformer advanced version PWM combined three level DC converter of Zero voltage switch main waveform schematic diagrames in two level mode of operations.
Accompanying drawing 21-24 is the equivalent circuit structure schematic diagram of each switch mode.
Main designation in the above-mentioned accompanying drawing: Vin, input direct voltage.Cd1, Cd2, input dividing potential drop electric capacity.Q1～Q6, switching tube.C1～C6, switching tube parasitic capacitance.D1～D6, switching tube body diode.Df1, Df2, fly-wheel diode.Css, striding capacitance.Tr1, Tr2, isolating transformer.Llk1, Llk2, the parasitic leakage inductance in the former limit of isolating transformer.Lr, resonant inductance.Dc1, Dc2, clamping diode.DR1, DR2, DR3, DR4, secondary rectifier diode.Lf, output inductor.Cf, output 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.
Five, embodiment
Accompanying drawing 1,17 and 18 is narrated circuit of the present invention respectively and is formed structure.To distinguish below and be introduced:
(1) PWM combined three level DC converter of Zero voltage switch
When input voltage is low, a less fixed skew δ is arranged between switching tube Q1, Q4 and switching tube Q2, the Q3, purpose is that the switching process decoupling zero of these two pairs of switching tubes is come.But because δ is very little, the approximate full duty ratio work of half-bridge three-level converter, switching tube Q2, Q3 and switching tube Q5, Q6 phase shift work are regulated output voltage by the phase shifting angle of regulating between them, and this moment, voltage vAC was the waveform of a pulse-width modulation.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 the high-frequency ac component amplitude is very little.There are three level in voltage vrect: 1 level ((k1+k2) Vin/2), intermediate level (k1Vin/2) and 0 level (duty-cycle loss that is caused by two leakage inductances causes), wherein k1 and k2 are respectively the secondary former limit no-load voltage ratio of transformer Tr1 and Tr2, 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.When input voltage rises to a certain value, or converter is in starting, and when overload or short-circuit condition, this phase shifting angle reaches 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 switching tube 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.
Advance pipe Q1, Q4, Q5, Q6 can realize zero voltage switch by output inductor in wide loading range, hysteresis pipe Q2 and Q3 are then realizing zero voltage switch by the energy of leakage inductance or extra resonance inductance in certain loading range, thereby reduce the switching loss of switching tube, improve conversion efficiency.
Concrete operation principle below in conjunction with accompanying drawing 2-16 narration PWM combined three level DC converter of Zero voltage switch.By accompanying drawing 2 as can be known this converter switch periods in three level modes 16 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], [t13, t14], [t14, t15], wherein, [t0 was in the past, t7] be the preceding half period, [t7, t15] 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 isolating transformer are desirable component; 3. striding capacitance Css is enough big, and its voltage is Vin/2 during stable state.
1. before the switch mode 1[t0] [corresponding to accompanying drawing 4]
T0 in the past, switching tube Q1, Q2 and Q6 conducting, primary current ip1 flow through power supply just, switching tube Q1, switching tube Q2, the former limit of transformer Tr1 winding, get back to power-at last.In another loop, primary current ip2 flow through power supply just, switching tube Q1, switching tube Q2, the former limit of transformer Tr2 winding, switching tube Q6 and sustained diode f2, get back to power-at last.Secondary rectifying tube DR1, DR4 conducting, former limit provides energy to secondary.
2. switch mode 2[t0-t1] [corresponding to accompanying drawing 5]
T0 is on-off switching tube Q6 constantly, and primary current ip2 is transferred to capacitor C 5 and the C6 branch road from switching tube Q6, gives capacitor C 6 chargings, gives capacitor C 5 discharges.Under the cushioning effect of capacitor C 5 and C6, switching tube Q6 is approximately no-voltage and turn-offs, and voltage vAB keeps Vin/2 constant, and voltage vAC descends.To t1 constantly, the voltage of capacitor C 6 rises to Vin/2, and the voltage of capacitor C 5 reduces to zero, the conducting of diode D5 nature.
3. switch mode 3[t1-t2] [corresponding to accompanying drawing 6]
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.During this period, voltage vAB=Vin/2, voltage vAC=0.
4. switch mode 4[t2-t3] [corresponding to accompanying drawing 7]
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, and it is constant that voltage vAC keeps nought state.Because it is that no-voltage is turn-offed that capacitor C 1 and C4, switching tube Q1 are arranged.To t3 constantly, capacitor C 1 voltage linear rises to Vin/2, and capacitor C 4 voltages drop to zero, and can no-voltage open switching tube Q4 this moment.Meanwhile, A point potential drop is to Vin/2, the conducting of sustained diode f1 nature.
5. switch mode 5[t3-t4] [corresponding to accompanying drawing 8]
Open switching tube Q4 in this period no-voltage, though switching tube Q4 by open-minded, and no current flows through.Current i p1 flow through switching tube Q2, transformer Tr1 former limit winding and sustained diode f1, current i p2 flow through switching tube Q2, transformer Tr2 former limit winding and switching tube Q5, voltage vAB=vAC=0.
6. switch mode 6[t4-t5] [corresponding to accompanying drawing 9]
In the t4 moment, no-voltage on-off switching tube Q2, current i p1 and ip2 give capacitor C 2 chargings, discharge for capacitor C 3 by capacitor C ss simultaneously.Voltage vAB and voltage vAC become negative simultaneously by zero, the primary current of two transformers is descended, and primary current will be not enough to provide load current, the conducting simultaneously of four rectifier diodes of secondary, and two transformer secondary short circuits, the original edge voltage sum is zero.During this period, be actually leakage inductance and the capacitor C 2 and the work of C3 resonance of two transformers.To t5 constantly, capacitor C 2 voltages rise to Vin/2, and capacitor C 3 voltages drop to zero, the conducting of diode D3 nature.
7. switch mode 7[t5-t6] [corresponding to accompanying drawing 10]
T5 constantly, diode D3 conducting, zero, can no-voltage open switching tube Q3 this moment with the voltage clamp at switching tube Q3 two ends.The conducting simultaneously still of secondary rectifier diode this moment, the original edge voltage sum is zero.Primary current ip1 and ip2 are linear simultaneously to descend, and to t6 constantly, primary current ip1 and ip2 drop to zero.
8. switch mode 8[t6-t7] [corresponding to accompanying drawing 11]
T6 constantly, primary current is by on the occasion of zero passage, and increases to negative direction is linear.Because this moment, primary current was not enough to provide load current, the conducting simultaneously of secondary rectifying tube.
9. switch mode 9[t7-t8] [corresponding to accompanying drawing 12]
To t7 constantly, primary current oppositely is increased to the load current of conversion to former limit, and rectifying tube DR1 and DR4 turn-off, and rectifying tube DR2 and DR3 flow through whole load currents.Converter enters the later half cycle, and working condition and above-mentioned half period are similar.
By accompanying drawing 3 as can be known converter in the next switch periods of two level modes, comprise 12 switch mode, wherein, [t0 in the past, t5] is the preceding half period, [t5, t11] 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, t6] in the period working condition of four switch mode make a concrete analysis of.
1. switch mode 1[t2-t3] [corresponding to accompanying drawing 13]
In the t2 moment, no-voltage on-off switching tube Q2 and Q5, primary current ip1 and ip2 give capacitor C 2 chargings, give capacitor C 3 discharges by capacitor C ss, and the while, current i p2 was along diode D5 afterflow.Primary current descends, and is not enough to provide load current, the conducting simultaneously of secondary rectifying tube, and two transformer secondary short circuits, the original edge voltage sum is zero.During this period, the leakage inductance of two transformers and capacitor C 2 and C3 resonance work.To t3 constantly, capacitor C 2 voltages rise to Vin/2, and capacitor C 3 voltages drop to zero, the conducting of diode D3 nature.
2. switch mode 2[t3-t4] [corresponding to accompanying drawing 14]
In the t3 moment, no-voltage is opened switching tube Q3, and primary current ip2 continues to flow through from diode D5.The secondary rectifying tube is conducting simultaneously still, and secondary short circuit, original edge voltage are added on the leakage inductance of transformer, and primary current is linear to descend.To t4 constantly, primary current drops to zero.
3. switch mode 3[t4-t5] [corresponding to accompanying drawing 15]
In the t4 moment, primary current ip1 and ip2 drop to zero, and increase in the other direction, and current i p2 is transferred to the switching tube Q6 from diode D5 and circulates.Because primary current is not enough to provide load current, the secondary rectifying tube is conducting simultaneously still.
4. switch mode 4[t5-t6] [corresponding to accompanying drawing 16]
In the t5 moment, primary current oppositely increases to the load current of converting former limit, and rectifying tube DR1 and DR4 turn-off, and rectifying tube DR2 and DR3 flow through whole load currents, and former limit provides energy to secondary.Converter enters the later half cycle, and working condition and above-mentioned half period are similar.
(2) modified model PWM combined three level DC converter of Zero voltage switch
Accompanying drawing 17 and 18 is a modified model PWM combined three level DC converter of Zero voltage switch structural representation, they are formed by input dividing potential drop condenser network (1), half-bridge three-level converter (2), full-bridge converter (3), isolating transformer (4), rectification and filter circuit (5) and clamping diode (6), converter is roughly the same in circuit structure and the accompanying drawing 1, difference is: on original converter basis, increased by two kinds of clamped networks respectively in half-bridge three-level converter and full-bridge converter.In the accompanying drawing 17, resonant inductance Lr, transformer Tr1 and clamping diode Dc1, Dc2 form transformer advanced version clamped network; In the accompanying drawing 18, resonant inductance Lr, transformer Tr2 and clamping diode Dc1, Dc2 form transformer retarded type clamped network.
Converter is identical in the control strategy of modified model PWM combined three level DC converter of Zero voltage switch and the accompanying drawing 1.
Be main circuit structure with accompanying drawing 17 below, 19-24 narrates the concrete operation principle of modified model PWM combined three level DC converter of Zero voltage switch in conjunction with the accompanying drawings.
By accompanying drawing 19 as can be known converter switch periods in three level modes 20 kinds of switch mode are arranged.Wherein, [t0 in the past, t9] is the preceding half period, and [t9, t19] is the later half cycle.Because switch mode is many, only the clamping diode switch mode that plays clamping action is analyzed below.
1. switch mode 1[t7-t8] [corresponding to accompanying drawing 21]
The t7 moment, switching tube Q3, Q4 and Q5 conducting, capacitor C R1 and CR4 charging is promptly given in resonant inductance Lr and capacitor C R1, the work of CR4 resonance, and primary current ip1 and resonance inductive current iLr increase.In this period, the B point voltage is fixed on Vin/2, and voltage vOB oppositely rising because capacitor C R1 and CR4 charge, so 0 current potential is descending always.To t8 constantly, secondary voltage rises to (k1+k2) Vin/2, this moment, 0 point voltage dropped to zero, clamping diode Dc2 conducting, with voltage vOB pincers at-Vin/2, therefore with the secondary voltage pincers at (k1+k2) Vin/2, thereby eliminated due to voltage spikes and the vibration that causes by resonant inductance Lr and capacitor C R1, CR4 resonance.
2. switch mode 2[t8-t9] [corresponding to accompanying drawing 22]
After diode Dc2 conducting, current i p1 step drops to the filter inductance current i Lf that converts the former limit of transformer Tr1, increase because filter inductance current i Lf is linear, primary current ip1 also increases thereupon, and resonant inductance current i Lr remains unchanged, and the difference of it and primary current ip1 flows through from diode Dc2.To t9 constantly, primary current ip1 and resonance inductive current iLr equate that diode Dc2 turn-offs.
In the t17 moment, converter is in the later half cycle, switching tube Q1, Q2 and Q6 conducting, and its working condition and preceding half period are similar.To t18 constantly, diode Dc1 conducting, secondary voltage is clamped at (k1+k2) Vin/2 equally.
By accompanying drawing 20 as can be known converter in the next switch periods of two level modes, comprise 16 switch mode, wherein, [t0 in the past, t7] is the preceding half period, [t7, t15] is the later half cycle.Also only the switch mode that clamping action is arranged is analyzed below.
1. switch mode 1[t5-t6] [corresponding to accompanying drawing 23]
The t5 moment, switching tube Q3, Q4 and Q6 conducting simultaneously, capacitor C R1 and CR4 charging is promptly given in resonant inductance Lr and capacitor C R1, the work of CR4 resonance, and primary current ip1 and resonance inductive current iLr oppositely increase.Because B point current potential is always Vin/2, so 0 current potential constantly descends along with the charging of capacitor C R1 and CR4.To t6 constantly, secondary voltage rises to k1Vin/2, and 0 current potential drops to zero.Diode Dc2 conducting this moment, with voltage vOB pincers at-Vin/2, therefore with the secondary voltage pincers at k1Vin/2, thereby realize clamp function.
2. switch mode 2[t6-t7] [corresponding to accompanying drawing 24]
After diode Dc2 conducting, primary current ip1 step drops to the filter inductance current i Lf that converts the former limit of transformer Tr1, and current i Lr remains unchanged, and the difference of it and current i p1 flows through from diode Dc2.In the t7 moment, current i p1 and current i Lr equate that diode Dc2 turn-offs.
In the t13 moment, converter is in the later half cycle, switching tube Q1, Q2 and Q5 conducting, and its working condition and preceding half period are similar.To t14 constantly, diode Dc1 conducting, secondary voltage is clamped at k1Vin/2 equally.
Under two level modes, clamping diode conducting in a switch periods once occurs in a period of time after the secondary voltage clamp of rectifier tube, and the secondary rectifying tube is played clamping action; And under three level modes, clamping action is wherein for once played in clamping diode conducting twice in a switch periods, once then is redundant in addition.
In the accompanying drawing 18 in the clamp principle of modified model converter and the accompanying drawing 17 converter basic identical.
This shows, after in PWM combined three level DC converter of Zero voltage switch, having introduced clamped network, no matter be at three level modes or two level modes, due to voltage spikes that can both reasonable elimination secondary rectifying tube, diminish the absorption circuit thereby saved, realize the purpose of clamp.
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 Tr1 no-load voltage ratio: 0.168; The secondary former limit of transformer Tr2 no-load voltage ratio: 0.149; The former limit of transformer Tr1 leakage inductance: Llk1=2.6uH; The former limit of transformer Tr2 leakage inductance: Llk2=3uH; Resonant inductance: Lr=30uH; Output inductor: Lf=13.2uH; Output filter capacitor: Cf=2200uF * 2; MOSFET (Q1-Q6): SPW20N60S5; Fly-wheel diode (Df1, Df2): DSEI30-06A; Secondary rectifier diode (DR1-DR4): DSEP30-03A; Switching frequency: fs=100kHz.
As seen from the above description, PWM combined three level DC converter of Zero voltage switch and the modified converter thereof of the present invention's proposition have following advantage:
The voltage stress of all switching tubes is half of input voltage;
Output commutating voltage waveform medium-high frequency component is little, can reduce output filter, thereby the power that improves converter is close Spend, improve the dynamic characteristic of converter;
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 junction capacity of transformer leakage inductance and output inductor and switching tube can realize the ZVT of switching tube;
In the modified converter, increase resonant inductance, enlarged the loading range of switching tube realization ZVT, can Obviously improve the efficient of two level mode downconverters;
Introduce two clamp diodes, can under three level modes and two level modes, eliminate the voltage point of secondary rectifying tube The peak diminishes absorbing circuit thereby save, and further improves the efficient of converter.
Claims (3)
1, a kind of PWM combined three level DC converter of Zero voltage switch, comprise by DC power supply (Vin) and two dividing potential drop electric capacity (Cd1, Cd2) be connected in parallel on the input dividing potential drop condenser network (1) that the positive and negative two ends of DC power supply (Vin) are formed after the series connection, isolating transformer (4), rectification and filter circuit (5), wherein the composition of rectification and filter circuit (5) is, four rectifier diodes are composed in series the two-way rectification circuit in twos, positive-negative output end after this two-way rectification circuit parallel connection also connects output inductor (Lf) and the series circuit of output filter capacitor (Cf) formation loop, the series connection point of two rectifier diodes of first rectification circuit is connected in the end of the same name of first isolating transformer (Tr1) secondary winding, the series connection point of two diodes of second rectification circuit is connected in the different name end of second isolating transformer (Tr2) secondary winding, 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), second switch pipe (Q2), after connecting successively, the 3rd switching tube (Q3) and the 4th switching tube (Q4) be attempted by 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 of forward series connection and striding capacitance (Css) series connection point that all is connected in parallel on first switching tube (Q1) and second switch pipe (Q2) simultaneously and the 3rd switching tube (Q3) and the 4th switching tube (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, the end of the same name of the former limit of first isolating transformer (Tr1) winding is connected in the series connection point of second switch pipe (Q2) and the 3rd switching tube (Q3), the different name end is connected in two fly-wheel diode (Df1 after connecting the first isolating transformer parasitic leakage inductance in former limit (Llk1), Df2) series connection point, first switching tube (Q1), second switch pipe (Q2), the 3rd switching tube (Q3) and the 4th switching tube (Q4) parasitic body diode in parallel separately and parasitic capacitance, the composition of described full-bridge converter (3) is between the series connection point with the series connection point of the 5th switching tube (Q5) and first switching tube (Q1) that is connected in parallel on half-bridge three-level converter (2) after the 6th switching tube (Q6) is connected and second switch pipe (Q2) and the 3rd switching tube (Q3) and the 4th switching tube (Q4), the different name end of the former limit of second isolating transformer (Tr2) winding connects the series connection point that is connected in the 5th switching tube (Q5) and the 6th switching tube (Q6) after the parasitic leakage inductance in former limit (Llk2) of second isolating transformer (Tr2), its second switch pipe (Q2) that terminates at half-bridge three-level converter (2) of the same name links to each other the 5th with the series connection point of the 3rd switching tube (Q3) and with the end of the same name of first isolating transformer (Tr1), the 6 two switching tube (Q5, Q6) parasitic body diode in parallel separately and parasitic capacitance.
2, a kind of PWM combined three level DC converter of Zero voltage switch, comprise by being connected in parallel on input dividing potential drop condenser network (1), isolating transformer (4), rectification and the filter circuit of forming at the positive and negative two ends of DC power supply (Vin) (5) after DC power supply (Vin) and two dividing potential drop electric capacity (Cd1, the Cd2) series connection, wherein the composition of rectification and filter circuit (5) is, four rectifier diodes are composed in series the two-way rectification circuit in twos.Positive-negative output end after this two-way rectification circuit parallel connection also connects output inductor (Lf) and the series circuit of output filter capacitor (Cf) formation loop.The series connection point of two rectifier diodes of first rectification circuit is connected in the end of the same name of first isolating transformer (Tr1) secondary winding, and the series connection point of two diodes of second rectification circuit is connected in the different name end of second isolating transformer (Tr2) secondary winding.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), second switch pipe (Q2), after connecting successively, the 3rd switching tube (Q3) and the 4th switching tube (Q4) be attempted by 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 of forward series connection and striding capacitance (Css) series connection point that all is connected in parallel on first switching tube (Q1) and second switch pipe (Q2) simultaneously and the 3rd switching tube (Q3) and the 4th switching tube (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 second switch pipe (Q2) and the 3rd switching tube (Q3) behind the termination resonant inductance of the same name (Lr) of the former limit of first isolating transformer (Tr1) winding, the different name end is connected in two fly-wheel diode (Df1, Df2) series connection point, first switching tube (Q1), second switch pipe (Q2), the 3rd switching tube (Q3) and the 4th switching tube (Q4) parasitic body diode in parallel separately and parasitic capacitance, two clamping diode (Dc1, Dc2) be connected in parallel on input dividing potential drop condenser network (1) positive-negative output end, two clamping diode (Dc1 after the series connection, Dc2) series connection point is connected in the end of the same name of the former limit of first isolating transformer (Tr1) winding and the tie point of resonant inductance (Lr); The composition of described full-bridge converter (3) is between the series connection point with the series connection point of the 5th switching tube (Q5) and first switching tube (Q1) that is connected in parallel on half-bridge three-level converter (2) after the 6th switching tube (Q6) is connected and second switch pipe (Q2) and the 3rd switching tube (Q3) and the 4th switching tube (Q4), the different name end of the former limit of second isolating transformer (Tr2) winding is connected in the series connection point of the 5th switching tube (Q5) and the 6th switching tube (Q6), it is of the same name to terminate at the second switch pipe (Q2) of half-bridge three-level converter (2) and the series connection point of the 3rd switching tube (Q3), the 5th, the 6 two switching tube (Q5, Q6) same parasitic body diode in parallel and parasitic capacitance.
3, a kind of PWM combined three level DC converter of Zero voltage switch, comprise by DC power supply (Vin) and two dividing potential drop electric capacity (Cd1, Cd2) be connected in parallel on the input dividing potential drop condenser network (1) that the positive and negative two ends of DC power supply (Vin) are formed after the series connection, isolating transformer (4), rectification and filter circuit (5), wherein the composition of rectification and filter circuit (5) is, four rectifier diodes are composed in series the two-way rectification circuit in twos, positive-negative output end after this two-way rectification circuit parallel connection also connects output inductor (Lf) and the series circuit of output filter capacitor (Cf) formation loop, the series connection point of two rectifier diodes of first rectification circuit is connected in the end of the same name of first isolating transformer (Tr1) secondary winding, the series connection point of two diodes of second rectification circuit is connected in the different name end of second isolating transformer (Tr2) secondary winding, 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), second switch pipe (Q2), after connecting successively, the 3rd switching tube (Q3) and the 4th switching tube (Q4) be attempted by 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 of forward series connection and striding capacitance (Css) series connection point that all is connected in parallel on first switching tube (Q1) and second switch pipe (Q2) simultaneously and the 3rd switching tube (Q3) and the 4th switching tube (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, the end of the same name of the former limit of first isolating transformer (Tr1) winding is connected in the series connection point of second switch pipe (Q2) and the 3rd switching tube (Q3), the different name end is connected in two fly-wheel diode (Df1, Df2) series connection point, first switching tube (Q1), second switch pipe (Q2), the 3rd switching tube (Q3) and the 4th switching tube (Q4) parasitic body diode in parallel separately and parasitic capacitance; The composition of described full-bridge converter (3) is between the series connection point with the series connection point of the 5th switching tube (Q5) and first switching tube (Q1) that is connected in parallel on half-bridge three-level converter (2) after the 6th switching tube (Q6) is connected and second switch pipe (Q2) and the 3rd switching tube (Q3) and the 4th switching tube (Q4), the different name end of the former limit of second isolating transformer (Tr2) winding is connected in the series connection point of the 5th switching tube (Q5) and the 6th switching tube (Q6), its end of the same name is connected on the second switch pipe (Q2) of half-bridge three-level converter (2) and the series connection point of the 3rd switching tube (Q3) after being connected in resonant inductance (Lr), the 5th, the 6 two switching tube (Q5, Q6) same parasitic body diode in parallel and parasitic capacitance, two clamping diode (Dc1, Dc2) be connected in parallel on input dividing potential drop condenser network (1) positive-negative output end, two clamping diode (Dc1 after the series connection, Dc2) series connection point is connected in the end of the same name of the former limit of second isolating transformer (Tr2) winding and the tie point of resonant inductance (Lr).
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