CN103595257A - Isolation type direct-current buck converter with soft switching function and control method of isolation type direct-current buck converter - Google Patents
Isolation type direct-current buck converter with soft switching function and control method of isolation type direct-current buck converter Download PDFInfo
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- CN103595257A CN103595257A CN201310637118.0A CN201310637118A CN103595257A CN 103595257 A CN103595257 A CN 103595257A CN 201310637118 A CN201310637118 A CN 201310637118A CN 103595257 A CN103595257 A CN 103595257A
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Abstract
The invention discloses an isolation type direct-current buck converter with the soft switching function and a control method of the isolation type direct-current buck converter, and belongs to the technical field of power electronic converters. The converter is composed of an input source (Uin), a first input filter capacitor (Cin1), a second input filter capacitor (Cin2), a first switching tube (S1), a second switching tube (S2), a third switching tube (S3), a fourth switching tube (S4), an inductor (Lf), a transformer (T), a first diode (D1), a second diode (D2), an output filter capacitor (C0) and a load (R0). The first switching tube (S1) and the second switching tube (S2) alternatively work, the first switching tube (S1) and the third switching tube (S3) work in a complementary mode, the second switching tube (S2) and the fourth switching tube (S4) work in a complementary mode, and therefore output voltage control is achieved. The isolation type direct-current buck converter with the soft switching function has the advantages that the voltage stress of the switching devices is small, and soft switching of all the switching tubes can be achieved within the whole load range; high-frequency efficient power switching can be achieved, the inductance and the size of the transformer can be effectively reduced, high power density can be achieved, and the isolation type direct-current buck converter with the soft switching function is easy to control, high in reliability and easy to achieve.
Description
Technical field
The present invention relates to a kind of isolated soft switching step down DC converter and control method thereof, belong to converters technical field.
Background technology
Isolated DC buck converter is applicable to require input and output electrical isolation and output voltage lower than the occasion of input voltage, and this quasi-converter has a wide range of applications in every field such as communication power supply, server power supply, Aero-Space.
Traditional isolated DC transducer, such as forward converter, push-pull converter, half-bridge converter, full-bridge converter etc., all belongs to step-down type dc converter.Application scenario at output voltage far below input voltage, being most widely used of half-bridge converter.Yet there is following problem in traditional isolated form step down DC converter that the half-bridge converter of take is representative: the voltage stress of converter secondary rectifier diode is high; Large and the leakage inductance energy of transformer leakage inductance can not get effective utilization, causes due to voltage spikes and the concussion of switching device, further aggravated switching device stress, reduced reliability and efficiency.In addition, traditional DC converter can not realize the soft switch of switching tube conventionally, and the efficiency that has limited converter improves.In recent years, LLC controlled resonant converter has obtained extensive concern and application with advantages such as its outstanding soft switch, low voltage stress, yet LLC controlled resonant converter need to adopt variable frequency control, and converter design, realization and control is many compared with conventional transducers complexity all.
Above-mentioned factor is impelled the DC converter solution that electric and electronic technical field research staff constantly studies and proposes novel high-performance, high reliability, is easy to control and realizes just.
Summary of the invention
Goal of the invention:
The present invention is directed to the deficiencies in the prior art, a kind of isolated soft switching step down DC converter and control method thereof are provided.
Technical scheme:
The present invention is by the following technical solutions:
Described isolated soft switching step down DC converter is by input source (U
in), the first input filter capacitor (C
in1), the second input filter capacitor (C
in2), the first switching tube (S
1), second switch pipe (S
2), the 3rd switching tube (S
3), the 4th switching tube (S
4), inductance (L
f), transformer (T), the first diode (D
1) the second diode (D
2), output filter capacitor (C
o) and load (R
o) form, wherein transformer (T) is by former limit winding (N
p), the first secondary winding (N
s1) and the second secondary winding (N
s2) form;
Described input source (U
in) positive pole connect respectively the first input filter capacitor (C
in1) one end and the first switching tube (S
1) drain electrode, input source (U
in) negative pole connect respectively the second input filter capacitor (C
in2) one end and second switch pipe (S
2) source electrode, the first switching tube (S
1) source electrode connect respectively second switch pipe (S
2) drain electrode, the 3rd switching tube (S
3) drain electrode and filter inductance (L
f) one end, filter inductance (L
f) the other end and transformer (T) former limit winding (N
p) Same Name of Ends be connected, transformer (T) former limit winding (N
p) non-same polarity connect respectively the 4th switching tube (S
4) drain electrode, the first input filter capacitor (C
in1) the other end and the second input filter capacitor (C
in2) the other end, the 3rd switching tube (S
3) source electrode and the 4th switching tube (S
4) source electrode be connected;
Described transformer (T) the first secondary winding (N
s1) Same Name of Ends and the first diode (D
1) anode be connected, transformer (T) the first secondary winding (N
s1) non-same polarity respectively with transformer (T) the second secondary winding (N
s2) Same Name of Ends, output filter capacitor (C
o) one end and load (R
o) one end be connected, transformer (T) the second secondary winding (N
s2) non-same polarity and the second diode (D
2) anode be connected, the second diode (D
2) negative electrode respectively with the first diode (D
1) negative electrode, output filter capacitor (C
o) the other end and load (R
o) the other end be connected.
Inductance (L described in isolated soft switching step down DC converter of the present invention
f) can be replaced by the leakage inductance of transformer (T).
Described the first switching tube (S
1) and the 3rd switching tube (S
3) complementary conducting, second switch pipe (S
2) and the 4th switching tube (S
4) complementary conducting, the first switching tube (S
1) and second switch pipe (S
2) duty ratio equate and staggered conducting, by regulating the first switching tube (S
1) and second switch pipe (S
2) duty ratio realize the control of output voltage.
The present invention has following technique effect:
(1) voltage of all switching devices is all directly by input voltage or output voltage clamper, and switching device voltage stress is low;
(2) all switching devices can be realized soft switch in full-load range, and conversion efficiency is high;
(3) transformer leakage inductance is utilized effectively, the circulation or the due to voltage spikes problem that do not exist leakage inductance to cause;
(4) this converter can HF switch work, thereby effectively reduce the volume weight of inductance and transformer, realizes high power density;
(5) topological structure is succinct, control is simple.
Accompanying drawing explanation
Accompanying drawing 1 is the circuit theory diagrams of isolated soft switching step down DC converter of the present invention;
Accompanying drawing 2 is isolated soft switching step down DC converter of the present invention main oscillograms under continuous current mode mode of operation;
Accompanying drawing 3～accompanying drawing 7 is equivalent circuit diagrams of isolated soft switching step down DC converter of the present invention each switch mode under continuous current mode mode of operation;
Accompanying drawing 8 is isolated soft switching step down DC converter of the present invention main oscillograms under discontinuous current mode mode of operation;
Accompanying drawing 9～accompanying drawing 13 is equivalent circuit diagrams of isolated soft switching step down DC converter of the present invention each switch mode under discontinuous current mode mode of operation;
Designation in above accompanying drawing: U
infor input source; L
ffor inductance; T is transformer; N
pand N
s1and N
s2be respectively former limit winding, the first secondary winding and the second secondary winding of transformer (T); C
in1and C
in2be respectively the first and second input filter capacitors; C
ofor output filter capacitor; R
ofor load; S
1, S
2, S
3and S
4be respectively the first, second, third and the 4th switching tube; D
1, D
2be respectively the first and second diodes; U
ofor output voltage; u
dS1and u
dS3be respectively the first switching tube (S
1) and the 3rd switching tube (S
3) drain electrode and the voltage between source electrode; u
pfor transformer (T) former limit winding (N
p) voltage between Same Name of Ends and non-same polarity; u
mbe the first switching tube (S
1) source electrode and the 4th switching tube (S
4) voltage between drain electrode; i
lffor inductance (L
f) electric current; i
s1and i
s2be respectively the electric current that flows into the first and second switching tube drain electrodes; T, t
0, t
1, t
2, t
3, t
4and t
5for the time.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is elaborated.
As shown in Figure 1, isolated soft switching step down DC converter of the present invention is by input source (U
in), the first input filter capacitor (C
in1), the second input filter capacitor (C
in2), the first switching tube (S
1), second switch pipe (S
2), the 3rd switching tube (S
3), the 4th switching tube (S
4), inductance (L
f), transformer (T), the first diode (D
1) the second diode (D
2), output filter capacitor (C
o) and load (R
o) form, wherein transformer (T) is by former limit winding (N
p), the first secondary winding (N
s1) and the second secondary winding (N
s2) form; Described input source (U
in) positive pole connect respectively the first input filter capacitor (C
in1) one end and the first switching tube (S
1) drain electrode, input source (U
in) negative pole connect respectively the second input filter capacitor (C
in2) one end and second switch pipe (S
2) source electrode, the first switching tube (S
1) source electrode connect respectively second switch pipe (S
2) drain electrode, the 3rd switching tube (S
3) drain electrode and filter inductance (L
f) one end, filter inductance (L
f) the other end and transformer (T) former limit winding (N
p) Same Name of Ends be connected, transformer (T) former limit winding (N
p) non-same polarity connect respectively the 4th switching tube (S
4) drain electrode, the first input filter capacitor (C
in1) the other end and the second input filter capacitor (C
in2) the other end, the 3rd switching tube (S
3) source electrode and the 4th switching tube (S
4) source electrode be connected; Described transformer (T) the first secondary winding (N
s1) Same Name of Ends and the first diode (D
1) anode be connected, transformer (T) the first secondary winding (N
s1) non-same polarity respectively with transformer (T) the second secondary winding (N
s2) Same Name of Ends, output filter capacitor (C
o) one end and load (R
o) one end be connected, transformer (T) the second secondary winding (N
s2) non-same polarity and the second diode (D
2) anode be connected, the second diode (D
2) negative electrode respectively with the first diode (D
1) negative electrode, output filter capacitor (C
o) the other end and load (R
o) the other end be connected.
In the specific implementation, inductance (L
f) can be in whole or in part by the leakage inductance of transformer (T), be replaced, this leakage inductance that shows transformer (T) will be utilized effectively, and leakage inductance has been used as after Energy Transfer inductance, no longer there is due to voltage spikes or the loss problem that in traditional isolated converter, leakage inductance causes in this converter.
The first switching tube (S in isolated soft switching step down DC converter of the present invention
1) and the 3rd switching tube (S
3) complementary conducting, second switch pipe (S
2) and the 4th switching tube (S
4) complementary conducting, the first switching tube (S
1) and second switch pipe (S
2) duty ratio equate and staggered conducting, by regulating the first switching tube (S
1) and second switch pipe (S
2) duty ratio realize the control of output voltage.
In the specific implementation, the first switching tube (S
1) and the 3rd switching tube (S
3) switching signal between rational Dead Time must be set to realize the first switching tube (S
1) and the 3rd switching tube (S
3) soft switch, second switch pipe (S
2) and the 4th switching tube (S
4) switching signal between rational Dead Time also must be set to realize second switch pipe (S
2) and the 4th switching tube (S
4) soft switch.
In the specific implementation, all switching tubes should be selected the semiconductor switch device with parasitic body diode, such as mos field effect transistor etc.If selected switching tube, should be at its drain electrode and source electrode two ends anti-paralleled diode without parasitic body diode.
From the circuit structure of the isolated soft switching step down DC converter of the present invention shown in accompanying drawing 1, can find out intuitively this converter the first and second switching tube (S
1, S
2) drain-source voltage be all directly transfused to voltage clamping, its voltage stress just equals input voltage, the third and fourth switching tube (S
3, S
4) drain-source voltage be directly transfused to filter capacitor voltage clamping, its voltage stress only has half of input voltage, the switching device of converter secondary is by output voltage clamper, and all switching devices of former limit and secondary do not exist due to voltage spikes problem, and the voltage stress of switching device is low.
Suppose that all inductance, electric capacity, switching tube and diode are all desirable device, ignore the voltage ripple on all electric capacity, the first and second input filter capacitor C
in1and C
in2voltage sum equal input voltage U
in.According to inductance (L
f) operating state, isolated soft switching step down DC converter of the present invention (hereinafter to be referred as converter) can work in continuous current mode pattern or discontinous mode.Distinguish the operation principle of analytic transformation device under two kinds of mode of operations below.
When power output is larger, converter is usually operated at continuous current mode pattern.Accompanying drawing 2 is converter groundwork waveforms under continuous current mode pattern.Under this pattern, in half switch periods, have five kinds of switch mode.
Switch mode 1[t
0, t
1]: t
0constantly, switching tube S
3and S
4conducting, inductance L
fcurrent i
lffor negative value, inductance L
fthe energy of middle storage is through transformer and diode D
2be transferred to load, t
0constantly, switching tube S
3turn-off inductance L
fcommutate the current to switching tube S
1body diode in, switching tube S
1drain-source voltage reduce to 0, so S
1possessed the condition that no-voltage is opened, meanwhile, inductance L
fcurrent i
lfacting in conjunction lower linear at input and output voltage reduces, and this mode equivalent electric circuit as shown in Figure 3.
Switch mode 2[t
1, t
2]: t
1constantly, switching tube S
1no-voltage is open-minded, inductance L
felectric current continues to reduce, until t
2moment i
lfbe reduced to 0, the second diode D
2naturally turn-off, this mode equivalent electric circuit as shown in Figure 4.
Switch mode 3[t
2, t
3]: t
2constantly, inductance L
fcurrent i
lfsince 0 linear increasing, the first diode D
1conducting, input source is through inductance L
fto load transmitting energy, inductance L
fenergy storage, this mode equivalent electric circuit as shown in Figure 5.It should be noted that the lasting time of this mode is longer, the peak value of inductive current is larger, and input source is also longer to the time of load transmitting energy, and converter output voltage or power output were directly proportional to the duration of this mode, also with switching tube S
1duty ratio be directly proportional.
Switch mode 4[t
3, t
4]: t
3constantly, switching tube S
1turn-off inductance L
fcommutate the current to the 3rd switching tube S
3body diode in, S
3possessed the condition that no-voltage is opened, inductance L
felectric current linearity reduces, and this mode equivalent electric circuit as shown in Figure 6.
Switch mode 5[t
4, t
5]: t
4constantly, switching tube S
3no-voltage is open-minded, inductance L
fthe energy of middle storage is through transformer and diode D
1be transferred to load, inductance L
felectric current linearity reduces, and this mode equivalent electric circuit as shown in Figure 7.
T
5constantly, second switch periods starts, and the course of work is similar, no longer repeated description.
The course of work of summing up under continuous current mode pattern is known, under continuous current mode pattern, it is open-minded that all switching tubes can both be realized no-voltage, the electric current of two diodes is all that nature is reduced to 0, natural in 0 increase, therefore there is not diode reverse recovery problem, therefore, all switching devices are all soft switch working states.
When power output is lower, converter is usually operated at discontinous mode.Accompanying drawing 8 is converter groundwork waveforms under discontinous mode.Under this pattern, in half switch periods, have five kinds of switch mode.
Switch mode 1[t
0, t
1]: t
0constantly, switching tube S
3and S
4conducting, but inductance L
felectric current be 0, therefore two diodes are all off states; t
0constantly, S
3turn-off inductance L
felectric current remain 0, this mode equivalent electric circuit is as shown in Figure 9.
Switch mode 2[t
1, t
2]: t
1constantly, switching tube S
1zero current turning-on, inductance L
fcurrent i
lfsince 0 linear increasing, the first diode D
1conducting, input source is through inductance L
fto load transmitting energy, inductance L
fenergy storage, this mode equivalent electric circuit as shown in Figure 10.
Switch mode 3[t
2, t
3]: t
2constantly, switching tube S
1turn-off inductance L
fcommutate the current to the 3rd switching tube S
3body diode in, S
3possessed the condition that no-voltage is opened, inductance L
felectric current linearity reduces, and this mode equivalent electric circuit as shown in Figure 11.
Switch mode 4[t
3, t
4]: t
3constantly, switching tube S
3no-voltage is open-minded, inductance L
fthe energy of middle storage is through transformer and diode D
1be transferred to load, inductance L
felectric current linearity reduces, and this mode equivalent electric circuit as shown in Figure 12.
Switch mode 5[t
4, t
5]: t
4constantly, inductance L
felectric current be reduced to 0, diode D
1naturally turn-off, in this mode, although switching tube S
3and S
4conducting simultaneously, but do not have electric current to flow through, this mode equivalent electric circuit is as shown in Figure 13.
T
5constantly, second switch periods starts, and the course of work is similar, no longer repeated description.
The course of work of summing up under discontinous mode is known, under discontinous mode, and the first and second switching tube (S
1, S
2) can both realize zero current turning-on, the third and fourth switching tube (S
3, S
4) can both to realize no-voltage open-minded, the electric current of two diodes is all that nature is reduced to 0, nature increases since 0, does not therefore have diode reverse recovery problem, therefore, all switching devices are all also soft switch working states.
Claims (3)
1. an isolated soft switching step down DC converter, is characterized in that:
Described isolated soft switching step down DC converter is by input source (U
in), the first input filter capacitor (C
in1), the second input filter capacitor (C
in2), the first switching tube (S
1), second switch pipe (S
2), the 3rd switching tube (S
3), the 4th switching tube (S
4), inductance (L
f), transformer (T), the first diode (D
1) the second diode (D
2), output filter capacitor (C
o) and load (R
o) form, wherein transformer (T) is by former limit winding (N
p), the first secondary winding (N
s1) and the second secondary winding (N
s2) form;
Described input source (U
in) positive pole connect respectively the first input filter capacitor (C
in1) one end and the first switching tube (S
1) drain electrode, input source (U
in) negative pole connect respectively the second input filter capacitor (C
in2) one end and second switch pipe (S
2) source electrode, the first switching tube (S
1) source electrode connect respectively second switch pipe (S
2) drain electrode, the 3rd switching tube (S
3) drain electrode and filter inductance (L
f) one end, filter inductance (L
f) the other end and transformer (T) former limit winding (N
p) Same Name of Ends be connected, transformer (T) former limit winding (N
p) non-same polarity connect respectively the 4th switching tube (S
4) drain electrode, the first input filter capacitor (C
in1) the other end and the second input filter capacitor (C
in2) the other end, the 3rd switching tube (S
3) source electrode and the 4th switching tube (S
4) source electrode be connected;
Described transformer (T) the first secondary winding (N
s1) Same Name of Ends and the first diode (D
1) anode be connected, transformer (T) the first secondary winding (N
s1) non-same polarity respectively with transformer (T) the second secondary winding (N
s2) Same Name of Ends, output filter capacitor (C
o) one end and load (R
o) one end be connected, transformer (T) the second secondary winding (N
s2) non-same polarity and the second diode (D
2) anode be connected, the second diode (D
2) negative electrode respectively with the first diode (D
1) negative electrode, output filter capacitor (C
o) the other end and load (R
o) the other end be connected.
2. the isolated soft switching step down DC converter based on claim 1, is characterized in that: described inductance (L
f) can be replaced by the leakage inductance of transformer (T).
3. the control method based on isolated soft switching step down DC converter claimed in claim 1, is characterized in that:
Described the first switching tube (S
1) and the 3rd switching tube (S
3) complementary conducting, second switch pipe (S
2) and the 4th switching tube (S
4) complementary conducting, the first switching tube (S
1) and second switch pipe (S
2) duty ratio equate and staggered conducting, by regulating the first switching tube (S
1) and second switch pipe (S
2) duty ratio realize the control of output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310637118.0A CN103595257B (en) | 2013-11-28 | 2013-11-28 | A kind of isolated soft switching step down DC converter and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310637118.0A CN103595257B (en) | 2013-11-28 | 2013-11-28 | A kind of isolated soft switching step down DC converter and control method thereof |
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| CN103595257A true CN103595257A (en) | 2014-02-19 |
| CN103595257B CN103595257B (en) | 2016-03-30 |
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ID=50085274
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|---|---|---|---|
| CN201310637118.0A Active CN103595257B (en) | 2013-11-28 | 2013-11-28 | A kind of isolated soft switching step down DC converter and control method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601543A (en) * | 2019-09-11 | 2019-12-20 | 广州金升阳科技有限公司 | Wide gain control method of LLC resonant converter and resonant converter thereof |
| CN110649812A (en) * | 2019-09-06 | 2020-01-03 | 广州金升阳科技有限公司 | Wide-gain-range LLC resonant converter and control method thereof |
| CN110707931A (en) * | 2019-09-06 | 2020-01-17 | 广州金升阳科技有限公司 | LLC resonant converter and control method |
| CN110768535A (en) * | 2019-10-22 | 2020-02-07 | 广州金升阳科技有限公司 | Wide gain control method of variable topology LLC resonant converter |
| WO2022088744A1 (en) * | 2020-10-28 | 2022-05-05 | 广州金升阳科技有限公司 | Llc resonant converter, and wide gain control method |
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| CN1286521A (en) * | 2000-10-19 | 2001-03-07 | 南京航空航天大学 | Three-level DC converter of zero-voltage switch with clamping diode |
| CN102611310A (en) * | 2012-03-09 | 2012-07-25 | 南京航空航天大学 | Magnetic integrated self-driving current-double rectification half-bridge three-level direct-current converter |
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2013
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1286521A (en) * | 2000-10-19 | 2001-03-07 | 南京航空航天大学 | Three-level DC converter of zero-voltage switch with clamping diode |
| CN102611310A (en) * | 2012-03-09 | 2012-07-25 | 南京航空航天大学 | Magnetic integrated self-driving current-double rectification half-bridge three-level direct-current converter |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110649812A (en) * | 2019-09-06 | 2020-01-03 | 广州金升阳科技有限公司 | Wide-gain-range LLC resonant converter and control method thereof |
| CN110707931A (en) * | 2019-09-06 | 2020-01-17 | 广州金升阳科技有限公司 | LLC resonant converter and control method |
| WO2021042773A1 (en) * | 2019-09-06 | 2021-03-11 | 广州金升阳科技有限公司 | Llc resonant converter and control method |
| CN110649812B (en) * | 2019-09-06 | 2021-12-10 | 广州金升阳科技有限公司 | Wide-gain-range LLC resonant converter and control method thereof |
| CN110601543A (en) * | 2019-09-11 | 2019-12-20 | 广州金升阳科技有限公司 | Wide gain control method of LLC resonant converter and resonant converter thereof |
| CN110601543B (en) * | 2019-09-11 | 2020-08-18 | 广州金升阳科技有限公司 | Wide gain control method of LLC resonant converter and resonant converter thereof |
| CN110768535A (en) * | 2019-10-22 | 2020-02-07 | 广州金升阳科技有限公司 | Wide gain control method of variable topology LLC resonant converter |
| WO2021077757A1 (en) * | 2019-10-22 | 2021-04-29 | 广州金升阳科技有限公司 | Wide gain control method for variable topology llc resonant converter |
| CN110768535B (en) * | 2019-10-22 | 2021-09-14 | 广州金升阳科技有限公司 | Wide gain control method of variable topology LLC resonant converter |
| WO2022088744A1 (en) * | 2020-10-28 | 2022-05-05 | 广州金升阳科技有限公司 | Llc resonant converter, and wide gain control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103595257B (en) | 2016-03-30 |
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