CN103595257B - A kind of isolated soft switching step down DC converter and control method thereof - Google Patents
A kind of isolated soft switching step down DC converter and control method thereof Download PDFInfo
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- CN103595257B CN103595257B CN201310637118.0A CN201310637118A CN103595257B CN 103595257 B CN103595257 B CN 103595257B CN 201310637118 A CN201310637118 A CN 201310637118A CN 103595257 B CN103595257 B CN 103595257B
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- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
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- 238000011084 recovery Methods 0.000 description 2
- 238000004891 communication 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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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a kind of isolated soft switching step down DC converter and control method thereof, belong to converters technical field.This converter is by input source (U
in), the first and second input filter capacitor (C
in1, C
in2), first, second, third and fourth switching tube (S
1, S
2, S
3, S
4), inductance (L
f), transformer (T), the first and second diode (D
1, D
2), output filter capacitor (C
o) and load (R
o) form; First (S in this converter
1) and second switch pipe (S
2) staggered work, the first switching tube (S
1) and the 3rd switching tube (S
3) complementary duty, second switch pipe (S
2) and the 4th switching tube (S
4) complementary duty, thus realize the control of output voltage; Isolated soft switching step down DC converter of the present invention has in low, the whole loading range of switching device voltage stress can realize the advantages such as all switching tube Sofe Switch, high frequency, high efficiency power conversion can be realized, effectively reduce inductance and volume of transformer, realize high power density, and control is simple, reliability is high, be easy to realization.
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 be applicable to require input and output electrical isolation and output voltage lower than the occasion of input voltage, 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 belong to step-down type dc converter.In the application scenario of output voltage far below input voltage, being most widely used of half-bridge converter.But, be that traditional isolated form step down DC converter of representative exists following problem with half-bridge converter: the voltage stress of converter secondary rectifier diode is high; Transformer leakage inductance is large and leakage inductance energy can not get effective utilization, causes due to voltage spikes and the concussion of switching device, exacerbates the stress of switching device further, reduces reliability and efficiency.In addition, traditional DC converter can not realize the Sofe Switch of switching tube usually, and the efficiency limiting converter improves.In recent years, LLC resonant converter obtains extensive concern and application with advantages such as its outstanding Sofe Switch, low voltage stress, but LLC resonant converter needs to adopt variable frequency control, and converter design, realization and control are all many compared with conventional transducers complexity.
Just above-mentioned factor impel electric and electronic technical field research staff constantly study and propose novel high-performance, high reliability, be easy to control and realize DC converter solution.
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 vice-side winding (N
s1) and the second vice-side winding (N
s2) form;
Described input source (U
in) positive pole connect the first input filter capacitor (C respectively
in1) one end and the first switching tube (S
1) drain electrode, input source (U
in) negative pole connect the second input filter capacitor (C respectively
in2) one end and second switch pipe (S
2) source electrode, the first switching tube (S
1) source electrode connect second switch pipe (S respectively
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 the 4th switching tube (S respectively
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) first vice-side winding (N
s1) Same Name of Ends and the first diode (D
1) anode be connected, transformer (T) first vice-side winding (N
s1) non-same polarity respectively with transformer (T) second vice-side winding (N
s2) Same Name of Ends, output filter capacitor (C
o) one end and load (R
o) one end be connected, transformer (T) second vice-side 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 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) the equal and staggered conducting of duty ratio, 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 direct by input voltage or output voltage clamper, and switching device voltage stress is low;
(2) all switching devices can realize Sofe Switch in full-load range, and conversion efficiency is high;
(3) transformer leakage inductance is utilized effectively, and there is not circulation or due to voltage spikes problem that leakage inductance causes;
(4) this converter can HF switch work, thus 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 the former limit winding of transformer (T), the first vice-side winding and the second vice-side winding; 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 first, second, third and fourth 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 source electrode between voltage; 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 of inflow first and second switching tube drain electrode; 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 described in detail.
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 vice-side winding (N
s1) and the second vice-side winding (N
s2) form; Described input source (U
in) positive pole connect the first input filter capacitor (C respectively
in1) one end and the first switching tube (S
1) drain electrode, input source (U
in) negative pole connect the second input filter capacitor (C respectively
in2) one end and second switch pipe (S
2) source electrode, the first switching tube (S
1) source electrode connect second switch pipe (S respectively
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 the 4th switching tube (S respectively
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) first vice-side winding (N
s1) Same Name of Ends and the first diode (D
1) anode be connected, transformer (T) first vice-side winding (N
s1) non-same polarity respectively with transformer (T) second vice-side winding (N
s2) Same Name of Ends, output filter capacitor (C
o) one end and load (R
o) one end be connected, transformer (T) second vice-side 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 replaced by the leakage inductance of transformer (T) in whole or in part, this shows that the leakage inductance of transformer (T) will be utilized effectively, and after leakage inductance has been used as Energy Transfer inductance, no longer there is the due to voltage spikes or loss problem that in conventional isolating transformer, 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) the equal and staggered conducting of duty ratio, 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) Sofe 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) Sofe Switch.
In the specific implementation, all switching tubes should select the semiconductor switch device with parasitic body diode, such as mos field effect transistor etc.If selected switching tube is without parasitic body diode, then should at its drain electrode and source electrode two ends anti-paralleled diode.
Can find out intuitively from the circuit structure of the isolated soft switching step down DC converter of the present invention shown in accompanying drawing 1, this converter first and second switching tube (S
1, S
2) drain-source voltage be all directly transfused to voltage clamping, namely its voltage stress just equals input voltage, the third and fourth switching tube (S
3, S
4) drain-source voltage be then directly transfused to filter capacitor voltage clamping, its voltage stress only has the half of input voltage, the switching device of converter secondary is then 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 ideal component, ignore the voltage ripple on all electric capacity, then 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 (hereinafter referred to as converter) of the present invention 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 key operation waveforms under continuous current mode pattern.In this mode, five kinds of switch mode are had in half switch periods.
Switch mode 1 [t
0, t
1]: t
0before moment, 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
0moment, 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, therefore S
1possess the condition that no-voltage is opened, meanwhile, inductance L
fcurrent i
lfreduce in the acting in conjunction lower linear of input and output voltage, this mode equivalent electric circuit as shown in Figure 3.
Switch mode 2 [t
1, t
2]: t
1moment, 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
2moment, inductance L
fcurrent i
lflinear increase from 0, the first diode D
1conducting, input source is through inductance L
fto Load transportation energy, inductance L
fenergy storage, this mode equivalent electric circuit as shown in Figure 5.It should be noted that this mode continue time longer, the peak value of inductive current is larger, and input source is also longer to the time of Load transportation energy, and namely converter output voltage or power output were directly proportional to the duration of this mode, also namely with switching tube S
1duty ratio be directly proportional.
Switch mode 4 [t
3, t
4]: t
3moment, switching tube S
1turn off, inductance L
fcommutate the current to the 3rd switching tube S
3body diode in, S
3possesses the condition that no-voltage is opened, inductance L
felectric current linearly reduces, and this mode equivalent electric circuit as shown in Figure 6.
Switch mode 5 [t
4, t
5]: t
4moment, 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 linearly reduces, and this mode equivalent electric circuit as shown in Figure 7.
T
5after moment, second switch periods starts, and the course of work is similar, no longer repeated description.
The course of work summed up under continuous current mode pattern is known, under continuous current mode pattern, it is open-minded that all switching tubes can both realize no-voltage, the electric current of two diodes is all that nature is reduced to 0, naturally increases from 0, therefore there is not diode reverse recovery problem, therefore, all switching devices are all Sofe Switch operating states.
When power output is lower, converter is usually operated at discontinous mode.Accompanying drawing 8 is converter key operation waveforms under discontinous mode.In this mode, five kinds of switch mode are had in half switch periods.
Switch mode 1 [t
0, t
1]: t
0before moment, switching tube S
3and S
4conducting, but inductance L
felectric current be 0, therefore two diodes are all off states; t
0moment, 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
1moment, switching tube S
1zero current turning-on, inductance L
fcurrent i
lflinear increase from 0, the first diode D
1conducting, input source is through inductance L
fto Load transportation energy, inductance L
fenergy storage, this mode equivalent electric circuit as shown in Figure 10.
Switch mode 3 [t
2, t
3]: t
2moment, switching tube S
1turn off, inductance L
fcommutate the current to the 3rd switching tube S
3body diode in, S
3possesses the condition that no-voltage is opened, inductance L
felectric current linearly reduces, and this mode equivalent electric circuit as shown in Figure 11.
Switch mode 4 [t
3, t
4]: t
3moment, 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 linearly reduces, and this mode equivalent electric circuit as shown in Figure 12.
Switch mode 5 [t
4, t
5]: t
4moment, 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
5after moment, second switch periods starts, and the course of work is similar, no longer repeated description.
The course of work summed up under discontinous mode is known, under discontinous mode, and the first and second switching tube (S
1, S
2) can both zero current turning-on be realized, 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 from 0, and therefore there is not diode reverse recovery problem, therefore, all switching devices are also all Sofe Switch operating 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 vice-side winding (N
s1) and the second vice-side winding (N
s2) form;
Described input source (U
in) positive pole connect the first input filter capacitor (C respectively
in1) one end and the first switching tube (S
1) drain electrode, input source (U
in) negative pole connect the second input filter capacitor (C respectively
in2) one end and second switch pipe (S
2) source electrode, the first switching tube (S
1) source electrode connect second switch pipe (S respectively
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 the 4th switching tube (S respectively
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) first vice-side winding (N
s1) Same Name of Ends and the first diode (D
1) anode be connected, transformer (T) first vice-side winding (N
s1) non-same polarity respectively with transformer (T) second vice-side winding (N
s2) Same Name of Ends, output filter capacitor (C
o) one end and load (R
o) one end be connected, transformer (T) second vice-side 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. based on an isolated soft switching step down DC converter for claim 1, it is characterized in that: described inductance (L
f) can be replaced by the leakage inductance of transformer (T).
3., based on a control method for isolated soft switching step down DC converter according to claim 1, it is characterized in that:
Described 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) the equal and staggered conducting of duty ratio, 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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| Publication Number | Publication Date |
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| CN103595257A CN103595257A (en) | 2014-02-19 |
| CN103595257B true 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| 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 |
| CN112332674A (en) * | 2020-10-28 | 2021-02-05 | 广州金升阳科技有限公司 | LLC resonant converter and wide gain control method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2013
- 2013-11-28 CN CN201310637118.0A patent/CN103595257B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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