CN100379132C - Soft-switch PWM interleaving shunt-wound two-transistor forward power converter - Google Patents
Soft-switch PWM interleaving shunt-wound two-transistor forward power converter Download PDFInfo
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- CN100379132C CN100379132C CNB2005100411298A CN200510041129A CN100379132C CN 100379132 C CN100379132 C CN 100379132C CN B2005100411298 A CNB2005100411298 A CN B2005100411298A CN 200510041129 A CN200510041129 A CN 200510041129A CN 100379132 C CN100379132 C CN 100379132C
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- 239000000203 mixture Substances 0.000 claims description 3
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- 238000011217 control strategy Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The present invention relates to a soft switching PWM staggered parallel double-transistor forward converter which belongs to a direct current converter of an electric energy conversion device. The present invention is composed of two ways of double-transistor converters which are connected in parallel in a staggered mode, wherein one way of the double-transistor forward converters is composed of a power supply (Vin), power switching transistors (Q1) and (Q2), clamping diodes (DC1) and (DC2), a primary winding (NP1) at the primary side of a high-frequency isolation transformer (Tr), and a leakage inductor (Lc1) of a primary transformer; the other way of the double-transistor forward converters is composed of a power supply (Vin), power switching transistors (Q3) and (Q4), clamping diodes (DC3) and (DC4), the secondary winding (N<P2>) at the primary side of the high-frequency isolation transformer (Tr), and a leakage inductor (L<r2>) of a secondary transformer; an output rectification filter circuit is composed of output rectification diodes (DR1) and (DR2), an output filter inductor (Lf) and an output filter capacitor (Cf). The converter reserves the advantages of low voltage stress and high reliability of the double-transistor forward converter. Because the two ways of the double-transistor forward converters commonly use the high-frequency transformer, the utilization rate of the magnetic core of the transformer is improved. The two ways of the double-transistor forward converters are complemented for work in a staggered mode, and the two switching transistors of one way of the double-transistor forward converters are simultaneously switched off and are not simultaneously switched on. Therefore, the soft switching of the power transistors can be realized without the need of any additional active or passive circuit. The converter does not have a circulation state, decreases on-state power loss, and improves conversion efficiency and power density.
Description
One, technical field
Soft-switch PWM interleaving shunt-wound two-transistor forward power converter of the present invention, the DC converter of genus transformation of electrical energy device.
Two, background technology
The DC/DC converter that is applicable to high pressure input large-power occasions has full-bridge converter and two-transistor forward converter.Full-bridge converter is easy to realize the soft switch of switching tube, but has the danger of bridge arm direct pass, has reduced the reliability of converter.And reliability is the lifeline of all power electronic equipments, and is significant especially to airplane power source.Two-transistor forward converter has the ability of inherent anti-bridge arm direct pass, the reliability height, however the duty ratio of two-transistor forward converter can only be less than 0.5, and magnetic core of transformer is operated in the first quartile of magnetization curve, and be difficult for realizing soft switch, be difficult to improve the conversion efficiency and the power density of converter.American scholar Kutkut had proposed a kind of doube bridge converter in 1997, be made of two-way two-transistor forward converter crisscross parallel, a shared high frequency transformer utilizes phase shifting control to realize the zero voltage switch of switching tube, but there is bigger circulation, influenced the efficient of converter.Professor Yan Yangguang of South Airways had proposed a kind of novel two-way two-transistor forward converter in 2003, and the shared high frequency transformer of two-way two-transistor forward converter, and shared former limit clamping diode utilize the transformer leakage inductance energy to realize the zero voltage switch of switching tube.This converter output does not contain filter inductance, is applied in the commutator transformer occasion, can not realize exporting voltage stabilizing, is unfavorable for the optimal design of back level inverter.
Three, summary of the invention
The objective of the invention is to defective at above-mentioned converter, develop a kind of soft-switch PWM interleaving shunt-wound two-transistor forward power converter, to overcome the defective that existing converter exists, at the soft switch of realizing switching tube and keep that the two-transistor forward converter voltage stress is low, in the reliability advantages of higher, make converter not have the circulation state, reduce on-state loss, improve conversion efficiency and inverter power density.
Realize the soft-switch PWM interleaving shunt-wound two-transistor forward power converter of above-mentioned purpose, form by two-way two-transistor forward converter crisscross parallel, one routing power positive pole is connected in the drain electrode of first power switch pipe, the power switch pipe source electrode is connected in first transformer leakage inductance that links to each other with high-frequency isolation transformer former limit first winding end of the same name, the former limit of the high-frequency isolation transformer first winding different name end is connected in the drain electrode of second power switch pipe, its source electrode is connected in power cathode and constitutes the loop, be connected a clamping diode between the first transformer leakage inductance input and power cathode, being connected a clamping diode forms one road two-transistor forward converter equally between the former limit of the high-frequency isolation transformer first winding different name end and positive source; Another routing power positive pole is connected in the drain electrode of the 3rd power switch pipe, its source electrode is connected in second transformer leakage inductance that links to each other with the former limit of the high-frequency isolation transformer second winding different name end, high-frequency isolation transformer former limit second winding end of the same name is connected in the drain electrode of the 4th power switch pipe, its source electrode is connected in power cathode and constitutes the loop, between the second transformer leakage inductance input and power supply negative terminal, be connected a clamping diode, being connected a clamping diode forms the second road two-transistor forward converter equally between high-frequency isolation transformer former limit second winding end of the same name and positive source, the end of the same name of high-frequency isolation transformer secondary first winding is connected in the first output rectifier diode positive pole, the different name end of high-frequency isolation transformer secondary second winding is connected in the second output rectifier diode positive pole, the negative pole of two output rectifier diodes is the series filtering inductance simultaneously, series filtering electric capacity again, the filter capacitor other end are connected in the tie point of high-frequency isolation transformer secondary first winding different name end and secondary second winding end of the same name and form rectification filtering circuit.
A kind of interleaved series soft-switch PWM two-transistor forward converter, the series circuit that is become by two dividing potential drop capacitances in series just is being attempted by input DC power, input dividing potential drop condenser network is formed at negative two ends, it is characterized in that, two-way two-transistor forward converter interleaved series recited above is formed, wherein the drain electrode of first power switch pipe is connected in input dividing potential drop condenser network positive output end, the source electrode of first power switch pipe is connected in the negative electrode of first clamping diode, the anode of first clamping diode is connected in the drain electrode of the 3rd power switch pipe, the source electrode of the 3rd power switch pipe is connected in the negative electrode of the 3rd clamping diode, and the anode of the 3rd clamping diode is connected in the negative output terminal of input dividing potential drop condenser network; The negative electrode of second clamping diode is connected in the positive output end of input dividing potential drop condenser network, the anode of second clamping diode is connected in the drain electrode of second power switch pipe, the source electrode of second power switch pipe is connected in the negative electrode of the 4th clamping diode, the anode of the 4th clamping diode is connected in the drain electrode of the 4th power switch pipe, and the source electrode of the 4th power switch pipe is connected in the negative output terminal of input dividing potential drop condenser network; The tie point of the first power switch pipe source electrode and the first clamping diode negative electrode is connected in the input of first transformer leakage inductance, the output of first transformer leakage inductance is connected in the end of the same name of the former limit of high-frequency isolation transformer first winding, and the different name end of the former limit of high-frequency isolation transformer first winding is connected in the tie point of the drain electrode of second power switch pipe and the second clamping diode anode; The tie point of the 3rd power switch pipe source electrode and the 3rd clamping diode negative electrode is connected in the input of second transformer leakage inductance, the output of second transformer leakage inductance is connected in the different name end of the former limit of high-frequency isolation transformer second winding, and the end of the same name of the former limit of high-frequency isolation transformer second winding is connected in the tie point of the 4th clamping diode anode and the drain electrode of the 4th power switch pipe; The end of the same name of high-frequency isolation transformer secondary first winding is connected in the first output rectifier diode positive pole; The different name end of high-frequency isolation transformer secondary second winding is connected in the second output rectifier diode positive pole, after linking to each other, the negative pole of two output rectifier diodes is connected in the input of filter inductance, the output series filtering electric capacity of filter inductance, the filter capacitor other end are connected in the rectification filtering circuit of the tie point composition of high-frequency isolation transformer secondary first winding different name end and secondary second winding end of the same name.Control method of the present invention adopts improved PWM control, the staggered complementary work of two-way two-transistor forward converter, and two switching tubes of same road two-transistor forward converter turn-off simultaneously, but not open-minded simultaneously.
The present invention need not add the soft switch that any active or passive circuit has been realized power switch pipe, and there is not circulation in converter, reduces on-state loss, improves conversion efficiency and inverter power density.
Four, description of drawings
Accompanying drawing 2 is soft-switch PWM interleaving series connection two-transistor forward converter electrical block diagrams.
Accompanying drawing 3 is the main waveform schematic diagrames of soft-switch PWM interleaving shunt-wound two-transistor forward power converter.
Accompanying drawing 4-8 is the equivalent circuit structure schematic diagram of each switch mode
Main designation in the above-mentioned accompanying drawing: V
In---supply voltage.Q
1～Q
4---power switch pipe.C
1～C
4---the parasitic capacitance of power switch pipe.D
1～D
4---the body diode of power switch pipe.D
C1～D
C4---clamping diode.C
D1～C
D2---input dividing potential drop electric capacity.T
r---high frequency transformer; The former secondary no-load voltage ratio of transformer is K.L
R1, L
R2---transformer leakage inductance.N
P1, N
P2---the former limit of high-frequency isolation transformer winding; N
S1, M
S2---high-frequency isolation transformer secondary winding.D
R1, D
R2---the output rectifier diode.L
f---filter inductance.C
f---filter capacitor.R
Ld---load.V
oOutput voltage.I
o---output current.
Five, embodiment
Control method is as follows: 180 ° of complementary work of two-way two-transistor forward converter.Switching tube Q
1And Q
3Be 180 ° of complementary conductings, switching tube Q
1And Q
2Turn-off switching tube Q simultaneously
2With respect to switching tube Q
1The phase place that lags behind is open-minded; Switching tube Q
3And Q
4Turn-off switching tube Q simultaneously
4With respect to switching tube Q
2The phase place that lags behind is open-minded.So definition switching tube Q
1And Q
3Be advance pipe, switching tube Q
2And Q
4Be the pipe that lags behind.Switching tube Q
2And Q
4PWM work is by by-pass cock pipe Q
2And Q
4Pulse duration regulate output voltage.Control chip adopts 1 3895.
Advance pipe Q
1, Q
3The realization no-voltage turns on and off, and pipe Q lags behind
2And Q
4Realize zero current turning-on, no-voltage shutoff, thereby reduce the switching loss of switching tube, improve conversion efficiency.
Be main circuit structure with accompanying drawing 1 below, 3～8 narrate concrete operation principle of the present invention in conjunction with the accompanying drawings.By accompanying drawing 3 as can be known whole converter a switch periods 10 kinds of switch mode are arranged, be respectively [t
0, t
1], [t
1, t
2], [t
2, t
3], [t
3, t
4], [t
4, t
5], [t
5, t
6], [t
6, t
7], [t
7, t
8], [t
8, t
9], [t
9, t
10] (seeing accompanying drawing 2), wherein, [t
0, t
5] be the preceding half period, [t
5, t
10] 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 switching tubes and diode are desirable device; 2. all inductance, electric capacity and transformer are ideal element; 3. filter inductance L
fEnough big, can equivalence be output current I
oCurrent source.
1. switch mode 1[t
0, t
1] [corresponding to accompanying drawing 4]
Switching tube Q
1, Q
2Conducting, secondary rectifying tube D
R1Conducting, rectifying tube D
R2End, converter is by Transformer Winding N
P1To the load transfer energy.
2. switch mode 2[t
1, t
2] [corresponding to accompanying drawing 5]
t
1Moment on-off switching tube Q
1, Q
2, primary current i
Np1Give capacitor C
1, C
2Charging, primary current i
Np2Give capacitor C
3, C
4Discharge, i
Np1=i
Np2=I
o/ 2K.Switching tube Q
1, Q
2Both end voltage is linear to rise, for no-voltage is turn-offed.To t
2Constantly, switching tube Q
1, Q
2Both end voltage rises to V
In/ 2, switching tube Q
3, Q
4Both end voltage drops to zero, and can no-voltage open switching tube Q this moment
3
3. switch mode 3[t
2, t
3] [corresponding to accompanying drawing 6]
At t
2Constantly, diode D
C1, D
C2Conducting, secondary rectifying tube D at this moment
R1, D
R2Conducting simultaneously, the former secondary voltage of transformer are clamped at zero.Primary current i
Np1Effect lower linear at input voltage reduces.
4. switch mode 4[t
3, t
4] [corresponding to accompanying drawing 7]
t
3Moment primary current i
Np1Be reduced to zero, diode D
C1, D
C2Naturally end switching tube Q
1, Q
2Both end voltage is clamped at V
In/ 2.
5. switch mode 5[t
4, t
5] [corresponding to accompanying drawing 8]
t
4Constantly, switching tube Q
4Open-minded, because leakage inductance L
R2Effect, primary current i
Np2Slowly rise switching tube Q
4Be zero current turning-on.Switching tube Q
3At t
4Constantly open-minded, primary current i
Np2Effect lower linear at input voltage rises.Leakage inductance L
R1With capacitor C
1, C
2Resonance work, switching tube Q
1, Q
2Both end voltage is linear to rise.t
5Constantly, switching tube Q
1, Q
2Both end voltage rises to V
In, i
Np2=I
o/ K, secondary rectifier diode D
R1End.After this, converter is by winding N
P2To the load transfer energy.Converter begins second half cycling, and its working condition is similar to above-mentioned half period.
As seen from the above description, the soft-switch PWM interleaving shunt-wound two-transistor forward power converter of the present invention's proposition has following advantage:
This converter kept two-transistor forward converter switch tube voltage stress low, do not have bridge arm direct pass, a reliability height Etc. advantage.
Adopt the integrated magnetic of transformer, the two-way two-transistor forward converter shares a high frequency transformer, has improved magnetic The core utilization rate.
Adopt improved PWM control strategy, advance pipe realizes that no-voltage turns on and off, and the pipe that lags behind is realized zero electricity Stream is opened, no-voltage is turn-offed, and comes regulation output voltage by the pulse width of control lag pipe, has greatly reduced Switching loss is conducive to realize the high frequency of converter.
Need not add any active or passive circuit and realize resetting of primary current, not have the circulation state, greatly subtract Little on-state loss has improved conversion efficiency.
Claims (2)
1. a soft-switch PWM interleaving shunt-wound two-transistor forward power converter is made up of two-way two-transistor forward converter crisscross parallel, it is characterized in that power supply (V
In) positive pole is connected in the first power switch pipe (Q
1) drain electrode, the first power switch pipe (Q
1) source electrode be connected in high-frequency isolation transformer (T
r) the former limit first winding (N
P1) the first continuous transformer leakage inductance (L of end of the same name
R1), high-frequency isolation transformer (T
r) the former limit first winding (N
P1) the different name end is connected in the second power switch pipe (Q
2) drain electrode, the second power switch pipe (Q
2) source electrode be connected in power supply (V
In) negative pole, at the first transformer leakage inductance (L
R1) input and power supply (V
In) connect the first clamping diode (D between the negative pole
C1), at high-frequency isolation transformer (T
r) the former limit first winding (N
P1) be connected the second clamping diode (D between different name end and the positive source
C2), form one road two-transistor forward converter thus; Power supply (V
In) positive pole is connected in the 3rd power switch pipe (Q
3) drain electrode, the 3rd power switch pipe (Q
3) source electrode be connected in high-frequency isolation transformer (T
r) the former limit second winding (N
P2) the second continuous transformer leakage inductance (L of different name end
R2), the former limit second winding (N of high-frequency isolation transformer (Tr)
P2) end of the same name is connected in the 4th power switch pipe (Q
4) drain electrode, the 4th power switch pipe (Q
4) source electrode be connected in power supply (V
In) negative pole, at the second transformer leakage inductance (L
R2) input and power supply (V
In) connect the 3rd clamping diode (D between the negative pole
C3), at high-frequency isolation transformer (T
r) the former limit second winding (N
P2) end of the same name and power supply (V
In) same the 4th clamping diode (D that connects between the positive pole
C4), form the second road two-transistor forward converter thus; High-frequency isolation transformer (T
r) the secondary first winding (N
S1) end of the same name be connected in the first output rectifier diode (D
R1) positive pole, the high-frequency isolation transformer secondary second winding (N
S2) the different name end be connected in the second output rectifier diode (D
R2) positive pole, the negative pole of two output rectifier diodes is series filtering inductance (L simultaneously
f), series filtering electric capacity (C again
f), filter capacitor (C
f) other end is connected in high-frequency isolation transformer (T
r) the secondary first winding (N
S1) different name end and the secondary second winding (N
S2) tie point of end of the same name, two output rectifier diode (D
R1, D
R2) and filter inductance (L
f), filter capacitor (C
f) the composition rectification filtering circuit.
2. interleaved series soft-switch PWM two-transistor forward converter is by two dividing potential drop electric capacity (C
D1, C
D2) series circuit that is connected into is attempted by input DC power (V
In) just, input dividing potential drop condenser network is formed at negative two ends, it is characterized in that the first power switch pipe (Q
1) drain electrode be connected in input dividing potential drop condenser network positive output end, the first power switch pipe (Q
1) source electrode be connected in the first clamping diode (D
C1) negative electrode, the first clamping diode (D
C1) anode be connected in the 3rd power switch pipe (Q
3) drain electrode, the 3rd power switch pipe (Q
3) source electrode be connected in the 3rd clamping diode (D
C3) negative electrode, the 3rd clamping diode (D
C3) anode be connected in the negative output terminal of input dividing potential drop condenser network; Second clamping diode (the D
C2) negative electrode be connected in the positive output end of input dividing potential drop condenser network, the second clamping diode (D
C2) anode be connected in the second power switch pipe (Q
2) drain electrode, the second power switch pipe (Q
2) source electrode be connected in the 4th clamping diode (D
C4) negative electrode, the 4th clamping diode (D
C4) anode be connected in the 4th power switch pipe (Q
4) drain electrode, the 4th power switch pipe (Q
4) source electrode be connected in the negative output terminal of input dividing potential drop condenser network; The point that is connected in series of two electric capacity, the first clamping diode (D
C1) anode and the 3rd power switch pipe (Q
3) the tie point and the second power switch pipe (Q of drain electrode
2) source electrode and the 4th clamping diode (D
C4) the tie point of negative electrode link together the first power switch pipe (Q
1) source electrode and the first clamping diode (D
C1) tie point of negative electrode is connected in the first transformer leakage inductance (L
R1) input, the first transformer leakage inductance (L
R1) output be connected in high-frequency isolation transformer (T
r) the former limit first winding (N
P1) end of the same name, high-frequency isolation transformer (T
r) the former limit first winding (N
P1) the different name end be connected in the second power switch pipe (Q
2) drain electrode and the second clamping diode (D
C2) tie point of anode; The 3rd power switch pipe (Q
3) source electrode and the 3rd clamping diode (D
C3) tie point of negative electrode is connected in the second transformer leakage inductance (L
R2) input, the second transformer leakage inductance (L
R2) output be connected in high-frequency isolation transformer (T
r) the former limit second winding (N
P2) the different name end, high-frequency isolation transformer (T
r) the former limit second winding (N
P2) end of the same name be connected in the 4th clamping diode (D
C4) anode and the 4th power switch pipe (Q
4) drain electrode tie point; High-frequency isolation transformer (T
r) the secondary first winding (N
S1) end of the same name be connected in the first output rectifier diode (D
R1) positive pole; High-frequency isolation transformer (T
r) the secondary second winding (N
S2) the different name end be connected in the second output rectifier diode (D
R2) positive pole, two output rectifier diode (D
R1, D
R2) negative pole be connected in filter inductance (L after linking to each other
f) input, filter inductance (L
f) output series filtering electric capacity (C
f), filter capacitor (C
f) other end is connected in high-frequency isolation transformer (T
r) the secondary first winding (N
S1) different name end and the secondary second winding (N
S2) tie point of end of the same name, two output rectifier diode (D
R1, D
R2) and filter inductance (L
f), filter capacitor (C
f) the composition rectification filtering circuit.
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|---|---|---|---|
| CNB2005100411298A CN100379132C (en) | 2005-07-21 | 2005-07-21 | Soft-switch PWM interleaving shunt-wound two-transistor forward power converter |
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|---|---|---|---|
| CNB2005100411298A CN100379132C (en) | 2005-07-21 | 2005-07-21 | Soft-switch PWM interleaving shunt-wound two-transistor forward power converter |
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| CN100379132C true CN100379132C (en) | 2008-04-02 |
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Cited By (1)
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| TWI427912B (en) * | 2012-03-13 | 2014-02-21 | Univ Kun Shan | Interleaved dc-dc zero-voltage switching converter |
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| CN101557172B (en) * | 2009-05-19 | 2011-01-19 | 南京航空航天大学 | Input interleaved series forward DC-DC converter |
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| CN111130349A (en) * | 2020-01-15 | 2020-05-08 | 广东工业大学 | H-bridge high-gain boost converter and switching power supply |
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|---|---|---|---|---|
| US4618919A (en) * | 1984-10-04 | 1986-10-21 | Sperry Corporation | Topology for miniature power supply with low voltage and low ripple requirements |
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2005
- 2005-07-21 CN CNB2005100411298A patent/CN100379132C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4618919A (en) * | 1984-10-04 | 1986-10-21 | Sperry Corporation | Topology for miniature power supply with low voltage and low ripple requirements |
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Non-Patent Citations (1)
| Title |
|---|
| A DUAL BRIDGEHIGHCURRENTDC-TO-DCCONVERTERWITHSOFTSWITCHINGCAPABILITY. Nasser H.Kutkut,Glen Luckjiff, Deepak M.Divan.IEEE Industry Applications Society Annual Meeting. 1997 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI427912B (en) * | 2012-03-13 | 2014-02-21 | Univ Kun Shan | Interleaved dc-dc zero-voltage switching converter |
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| CN1734905A (en) | 2006-02-15 |
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