CN103296896B - A kind of soft switch isolation type boost direct current converter and control method thereof - Google Patents
A kind of soft switch isolation type boost direct current converter and control method thereof Download PDFInfo
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Abstract
The invention discloses a kind of soft switch isolation type boost direct current converter and control method thereof, belong to converters technical field.This converter is by input source (U
in), former limit switching circuit (10), secondary-side switch circuit (20), inductance (L
f), transformer (T), the first output filter capacitor (C
o1), the second output filter capacitor (C
o2) and load (R
o) form, its limit, Central Plains switching circuit (10) is made up of four switching tubes, and secondary-side switch circuit (20) is made up of two diodes and two switching tubes; This converter realizes the control of output voltage by former limit switching circuit (10) and the phase shifting control of secondary-side switch circuit (20) breaker in middle pipe; Soft switch isolation type boost direct current converter of the present invention possesses the ability realizing all switching tube Sofe Switch in whole loading range, high frequency, high efficiency power conversion can be realized, the volume of inductance and transformer can be effectively reduced, realize high power density, and control is simple, reliability is high, be easy to realization, for isolated form, high efficiency power conversion provide key technology scheme.
Description
Technical field
The present invention relates to a kind of isolated soft switching DC booster converter and control method thereof, belong to converters technical field.
Background technology
Isolated DC booster converter be applicable to require input and output electrical isolation and output voltage higher than the occasion of input voltage, this quasi-converter has a wide range of applications in every field such as generation of electricity by new energy, industry, civilian, Aero-Space.
Traditional isolated DC transducer, such as forward converter, anti exciting converter, push-pull converter, half-bridge converter, full-bridge converter etc., by adjusting the no-load voltage ratio of transformer, can both realize the boosting requirement expected.But the no-load voltage ratio of simple dependence adjustment transformer realizes boosting and there is following problem: the voltage stress of switching device is high, and particularly the voltage stress of converter secondary rectifier diode is far above output voltage; Transformer leakage inductance increases, and 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, limits the efficiency of converter.Although full-bridge converter can realize Sofe Switch by adopting phase shifting control under certain loads and input and output voltage condition, but its cost is the increase in the conduction loss of converter, the particularly circulation loss that causes of leakage inductance, when input voltage reduces, circulation loss will sharply increase, in addition, phase-shifted full-bridge converter also cannot realize Sofe Switch when underloading.
Booster type Full-bridge isolated DC converter (also claiming current source type Full-bridge isolated DC converter) just can realize higher isolation boosting ability without the need to increasing transformer voltage ratio, but when switch commutates, because transformer leakage inductance limits the climbing of electric current in transformer, the filter inductance of input will cause serious due to voltage spikes.In order to improve this problem, need to introduce various voltage clamping or absorbing circuit, document " Anmad Mousavi, Pritam Das, Gerry Moschopoulos.A comparativestudy of a new ZCS DC-DC full-bridge boost converter with a ZVS active-clamp converter, IEEETransactions on power electronics, vol.27, no.3, March2012, pp.1347-1358. " the due to voltage spikes problem of labor existing for booster type Full-bridge isolated DC converter, and the various voltage clamping scheme of comparative analysis, although it further provides the absorbing circuit scheme of improvement, but these schemes are all in the complexity adding circuit in varying degrees, add the cost of converter, add the difficulty of control, reduce transducer effciency and reduce reliability.
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 DC booster converter and control method thereof are provided.
Technical scheme:
The present invention adopts following technical scheme for achieving the above object:
Described isolated soft switching DC booster converter is by input source (U
in), former limit switching circuit (10), secondary-side switch circuit (20), inductance (L
f), transformer (T), the first output filter capacitor (C
o1), the second output filter capacitor (C
o2) and load (R
o) form, former limit switching circuit (10) is by the first switching tube (S
1), second switch pipe (S
2), the 3rd switching tube (S
3) and the 4th switching tube (S
4) form, secondary-side switch circuit (20) is by the first diode (D
1), the second diode (D
2), the 5th switching tube (S
5) and the 6th switching tube (S
6) form, transformer (T) comprises former limit winding (N
p) and vice-side winding (N
s);
Described input source (U
in) positive pole respectively with the first switching tube (S
1) drain electrode and the 3rd switching tube (S
3) drain electrode be connected, the first switching tube (S
1) source electrode be connected in second switch pipe (S respectively
2) drain electrode and inductance (L
f) one end, inductance (L
f) the other end be connected in transformer (T) former limit winding (N
p) Same Name of Ends, transformer (T) former limit winding (N
p) non-same polarity be connected in the 3rd switching tube (S
3) source electrode and the 4th switching tube (S
4) drain electrode, the 4th switching tube (S
4) source electrode be connected in second switch pipe (S
2) source electrode and input source (U
in) negative pole;
Described transformer (T) vice-side winding (N
s) Same Name of Ends be connected in the first diode (D
1) anode, the second diode (D
2) negative electrode and the drain electrode of the 5th switching tube (S5), transformer (T) vice-side winding (N
s) non-same polarity be connected in the 6th switching tube (S
6) drain electrode, one end of the first output filter capacitor (Co1) and one end of the second output filter capacitor (Co2), the other end of the first output filter capacitor (Co1) is connected in the negative electrode of the first diode (D1) and one end of load (Ro) respectively, the other end of load (Ro) is connected in the other end of the second output filter capacitor (Co2) and the anode of the second diode (D2) respectively, and the source electrode of the 5th switching tube (S5) is connected in the source electrode of the 6th switching tube (S6).
Inductance (L described in isolated soft switching DC booster converter of the present invention
f) can be replaced by the leakage inductance of transformer (T).
First switching tube (S described in isolated soft switching DC booster converter of the present invention
1) and second switch pipe (S
2) complementary conducting, the 3rd switching tube (S
3) and the 4th switching tube (S
4) complementary conducting, the 5th switching tube (S
5) and the 6th switching tube (S
6) complementary conducting, the first switching tube (S
1), second switch pipe (S
2), the 3rd switching tube (S
3), the 4th switching tube (S
4), the 5th switching tube (S
5) and the 6th switching tube (S
6) duty ratio equal, the first switching tube (S
1) and the 4th switching tube (S
4) simultaneously conducting, to turn off, second switch pipe (S simultaneously
2) and the 3rd switching tube (S
3) simultaneously conducting, to turn off, the first switching tube (S simultaneously
1) moment of opening be not later than the 6th switching tube (S
6) open the moment, the 3rd switching tube (S
3) moment of opening be not later than the 5th switching tube (S
5) open the moment, by regulating the first switching tube (S
1) and the 6th switching tube (S
6) phase shifting angle between turn-on instant realizes 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 DC booster converter of the present invention;
Accompanying drawing 2 is isolated soft switching DC booster converter of the present invention main oscillograms under continuous current mode mode of operation;
Accompanying drawing 3 ~ accompanying drawing 6 is equivalent circuit diagrams of isolated soft switching DC booster converter of the present invention each switch mode under continuous current mode mode of operation;
Accompanying drawing 7 is isolated soft switching DC booster converter of the present invention main oscillograms under discontinuous current mode mode of operation;
Accompanying drawing 8 ~ accompanying drawing 11 is equivalent circuit diagrams of isolated soft switching DC booster converter of the present invention each switch mode under discontinuous current mode mode of operation;
Designation in above accompanying drawing: U
infor input source; 10 is former limit switching circuit; 20 is secondary-side switch circuit; L
ffor inductance; T is transformer; N
pand N
sbe respectively former limit winding and the vice-side winding of transformer (T); N is transformer (T) vice-side winding (N
s) number of turn and transformer (T) former limit umber of turn (N
p) ratio; C
o1and C
o2be respectively the first and second output filter capacitors; R
ofor load; S
1, S
2, S
3, S
4, S
5and S
6be respectively the first, second, third, fourth, the 5th and the 6th switching tube; D
1, D
2be respectively the first and second diodes; U
ofor output voltage; u
dS1, u
dS4and u
dS6be respectively the first switching tube (S
1), the 4th switching tube (S
4) and the 6th switching tube (S
6) drain electrode and source electrode between voltage; u
sfor transformer (T) vice-side winding (N
s) voltage between Same Name of Ends and non-same polarity; i
lffor inductance (L
f) electric current; i
s1, i
s2, i
s3and i
s4be respectively the electric current flowing into the drain electrode of first, second, third and fourth switching tube; T, t
0, t
1, t
2, t
3and t
4for 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 DC booster converter of the present invention is by input source (U
in), former limit switching circuit (10), secondary-side switch circuit (20), inductance (L
f), transformer (T), the first output filter capacitor (C
o1), the second output filter capacitor (C
o2) and load (R
o) form, former limit switching circuit (10) is by the first switching tube (S
1), second switch pipe (S
2), the 3rd switching tube (S
3) and the 4th switching tube (S
4) form, secondary-side switch circuit (20) is by the first diode (D
1), the second diode (D
2), the 5th switching tube (S
5) and the 6th switching tube (S
6) form, transformer (T) comprises former limit winding (N
p) and vice-side winding (N
s); Described input source (U
in) positive pole respectively with the first switching tube (S
1) drain electrode and the 3rd switching tube (S
3) drain electrode be connected, the first switching tube (S
1) source electrode be connected in second switch pipe (S respectively
2) drain electrode and inductance (L
f) one end, inductance (L
f) the other end be connected in transformer (T) former limit winding (N
p) Same Name of Ends, transformer (T) former limit winding (N
p) non-same polarity be connected in the 3rd switching tube (S
3) source electrode and the 4th switching tube (S
4) drain electrode, the 4th switching tube (S
4) source electrode be connected in second switch pipe (S
2) source electrode and input source (U
in) negative pole; Described transformer (T) vice-side winding (N
s) Same Name of Ends be connected in the first diode (D
1) anode, the second diode (D
2) negative electrode and the drain electrode of the 5th switching tube (S5), transformer (T) vice-side winding (N
s) non-same polarity be connected in the 6th switching tube (S
6) drain electrode, one end of the first output filter capacitor (Co1) and one end of the second output filter capacitor (Co2), the other end of the first output filter capacitor (Co1) is connected in the negative electrode of the first diode (D1) and one end of load (Ro) respectively, the other end of load (Ro) is connected in the other end of the second output filter capacitor (Co2) and the anode of the second diode (D2) respectively, and the source electrode of the 5th switching tube (S5) is connected in the source electrode of the 6th switching tube (S6).
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, this converter no longer exists gangs up the due to voltage spikes or loss problem that leakage inductance in isolated converter causes.
First switching tube (S described in isolated soft switching DC booster converter of the present invention
1) and second switch pipe (S
2) complementary conducting, the 3rd switching tube (S
3) and the 4th switching tube (S
4) complementary conducting, the 5th switching tube (S
5) and the 6th switching tube (S
6) complementary conducting, the first switching tube (S
1), second switch pipe (S
2), the 3rd switching tube (S
3), the 4th switching tube (S
4), the 5th switching tube (S
5) and the 6th switching tube (S
6) duty ratio equal, the first switching tube (S
1) and the 4th switching tube (S
4) simultaneously conducting, to turn off, second switch pipe (S simultaneously
2) and the 3rd switching tube (S
3) simultaneously conducting, to turn off, the first switching tube (S simultaneously
1) moment of opening be not later than the 6th switching tube (S
6) open the moment, the 3rd switching tube (S
3) moment of opening be not later than the 5th switching tube (S
5) open the moment, by regulating the first switching tube (S
1) and the 6th switching tube (S
6) phase shifting angle between turn-on instant realizes the control of output voltage.
In the specific implementation, the first switching tube (S
1) and second switch pipe (S
2) switching signal between rational Dead Time must be set to realize the first switching tube (S
1) and second switch pipe (S
2) Sofe Switch, the 3rd switching tube (S
3) and the 4th switching tube (S
4) switching signal between rational Dead Time must be set to realize the 3rd switching tube (S
3) and the 4th switching tube (S
4) Sofe Switch, and the 5th switching tube (S
5) and the 6th switching tube (S
6) switching signal between then do not need to arrange any Dead Time.
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 DC booster converter of the present invention shown in accompanying drawing 1, the switching device on the former limit of this converter is all directly transfused to voltage clamping, namely its voltage stress just equals input voltage, and the switching device of converter secondary is all directly output voltage clamping, also namely its voltage stress just equals output voltage, there is not due to voltage spikes problem in all switching devices of former limit and secondary, 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 output filter capacitor C
o1and C
o2voltage sum equal output voltage U
o.According to inductance (L
f) operating state, isolated soft switching DC booster 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, four kinds of switch mode are had in half switch periods.
Switch mode 1 [t
0, t
1]: t
0before moment, switching tube S
2, S
3and S
5conducting, but switching tube S
5in electric current be zero, diode D
2conducting, inductance L
fcurrent i
lffor negative value, input source U
inthrough inductance L
fto Load transportation power; t
0moment, S
2, S
3turn off, inductance L
fcommutate the current to S
1and S
4body diode in, switching tube S
1and S
4voltage reduce to 0, therefore, S
1and S
4possess the condition that no-voltage is opened, meanwhile, inductance L
fcurrent i
lfreduce in the effect 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
1and S
4no-voltage is open-minded, inductance L
felectric current continues to reduce, until t
2moment i
lfbe reduced to 0, secondary side diode D
2naturally turn off, this mode equivalent electric circuit as shown in Figure 4.
Switch mode 3 [t
2, t
3]: t
2moment, switching tube S
6body diode naturally open-minded, S
6two ends electric current reduces to 0 naturally, is S
6no-voltage open the condition of creating, from t
2moment, switching tube S
5and S
6electric current all increase gradually from zero, inductance L
felectric current is at input source U
ineffect under from 0 forward increase, until t
3moment switching tube S
5turn off, this mode terminates, and this mode equivalent electric circuit as shown in Figure 5.It should be noted that the time that this mode continues is longer, the peak value of inductive current is larger, and converter can be larger to the power of Load transportation, and also namely converter output voltage or power output were directly proportional to the duration of this mode.
Switch mode 4 [t
3, t
4]: t
3moment, switching tube S
5shutoff, S
6open-minded, but due to S
5turn off, S
6in not electric current flow through, secondary winding current natural commutation is to diode D
1, input source U
inpass through inductance L
fcommon to Load transportation energy, inductance L
felectric current linearly reduces, and this mode equivalent electric circuit as shown in Figure 6.
T
4after 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 7 is converter key operation waveforms under discontinous mode.In this mode, four kinds of switch mode are had in half switch periods.
Switch mode 1 [t
0, t
1]: t
0before moment, switching tube S
2, S
3and S
5conducting, but due to inductance L
fcurrent i
lfreduce to 0, the electric current flowing through all switching tubes is all 0, two diode D of secondary
1and D
2all be in off state.T
0moment, S
2and S
3turn off, inductance L
felectric current still maintains 0 state, and this modal transformation device equivalent electric circuit as shown in Figure 8.
Switch mode 2 [t
1, t
2]: t
1moment, switching tube S
1and S
4zero current turning-on, switching tube S
6body diode naturally open-minded, S
6two ends electric current reduces to 0 naturally, is S
6no-voltage open the condition of creating, from t
1moment, switching tube S
5and S
6electric current all increase gradually from zero, inductance L
felectric current is linear from 0 to be increased, secondary side diode D
1nature conducting, this mode equivalent electric circuit as shown in Figure 9.
Switch mode 3 [t
2, t
3]: t
2moment, switching tube S
5shutoff, S
6open-minded, but due to S
5turn off, S
6in not electric current flow through, secondary winding current natural commutation is to diode D
1, input source U
inpass through inductance L
fcommon to Load transportation energy, inductance L
felectric current linearly reduces, and this mode equivalent electric circuit as shown in Figure 10.
Switch mode 4 [t
3, t
4]: t
4moment, inductance L
felectric current is reduced to 0 naturally, diode D
1naturally turn off, this mode equivalent electric circuit as shown in Figure 11.
T
4after 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, four switching tubes on the former limit of converter can both realize zero current turning-on naturally, it is open-minded that company's switching tube of secondary can both realize no-voltage naturally, 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 also all Sofe Switch operating states.
Claims (3)
1. an isolated soft switching DC booster converter, is characterized in that:
Described isolated soft switching DC booster converter is by input source (U
in), former limit switching circuit (10), secondary-side switch circuit (20), inductance (L
f), transformer (T), the first output filter capacitor (C
o1), the second output filter capacitor (C
o2) and load (R
o) form, former limit switching circuit (10) is by the first switching tube (S
1), second switch pipe (S
2), the 3rd switching tube (S
3) and the 4th switching tube (S
4) form, secondary-side switch circuit (20) is by the first diode (D
1), the second diode (D
2), the 5th switching tube (S
5) and the 6th switching tube (S
6) form, transformer (T) comprises former limit winding (N
p) and vice-side winding (N
s);
Described input source (U
in) positive pole respectively with the first switching tube (S
1) drain electrode and the 3rd switching tube (S
3) drain electrode be connected, the first switching tube (S
1) source electrode be connected in second switch pipe (S respectively
2) drain electrode and inductance (L
f) one end, inductance (L
f) the other end be connected in transformer (T) former limit winding (N
p) Same Name of Ends, transformer (T) former limit winding (N
p) non-same polarity be connected in the 3rd switching tube (S
3) source electrode and the 4th switching tube (S
4) drain electrode, the 4th switching tube (S
4) source electrode be connected in second switch pipe (S
2) source electrode and input source (U
in) negative pole;
Described transformer (T) vice-side winding (N
s) Same Name of Ends be connected in the first diode (D
1) anode, the second diode (D
2) negative electrode and the drain electrode of the 5th switching tube (S5), transformer (T) vice-side winding (N
s) non-same polarity be connected in the 6th switching tube (S
6) drain electrode, one end of the first output filter capacitor (Co1) and one end of the second output filter capacitor (Co2), the other end of the first output filter capacitor (Co1) is connected in the negative electrode of the first diode (D1) and one end of load (Ro) respectively, the other end of load (Ro) is connected in the other end of the second output filter capacitor (Co2) and the anode of the second diode (D2) respectively, and the source electrode of the 5th switching tube (S5) is connected in the source electrode of the 6th switching tube (S6).
2. based on an isolated soft switching DC booster converter for claim 1, it is characterized in that: described inductance (L
f) replaced by the leakage inductance of transformer (T).
3., based on a control method for isolated soft switching DC booster converter according to claim 1, it is characterized in that:
Described first switching tube (S
1) and second switch pipe (S
2) complementary conducting, the 3rd switching tube (S
3) and the 4th switching tube (S
4) complementary conducting, the 5th switching tube (S
5) and the 6th switching tube (S
6) complementary conducting, the first switching tube (S
1), second switch pipe (S
2), the 3rd switching tube (S
3), the 4th switching tube (S
4), the 5th switching tube (S
5) and the 6th switching tube (S
6) duty ratio equal, the first switching tube (S
1) and the 4th switching tube (S
4) simultaneously conducting, to turn off, second switch pipe (S simultaneously
2) and the 3rd switching tube (S
3) simultaneously conducting, to turn off, the first switching tube (S simultaneously
1) moment of opening be not later than the 6th switching tube (S
6) open the moment, the 3rd switching tube (S
3) moment of opening be not later than the 5th switching tube (S
5) open the moment, by regulating the first switching tube (S
1) and the 6th switching tube (S
6) phase shifting angle between turn-on instant realizes the control of output voltage.
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| CN103595258A (en) * | 2013-11-28 | 2014-02-19 | 南京航空航天大学 | Boost type soft switching resonant converter and frequency fixing control method thereof |
| CN105450030B (en) * | 2014-09-18 | 2018-11-09 | 南京航空航天大学 | Dual transformer becomes winding isolated converter and its control method |
| CN104980037B (en) * | 2015-07-07 | 2017-09-15 | 南京航空航天大学 | A kind of secondary adjusting type determines frequency controlled resonant converter and its control method |
| CN106655839B (en) * | 2016-12-06 | 2023-08-01 | 珠海高新创业投资有限公司 | Isolated soft switch alternating current-direct current conversion power supply |
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|---|---|---|---|---|
| CN1489272A (en) * | 2002-10-08 | 2004-04-14 | 中国科学院电工研究所 | Phase-shift full-bridge high-frequency inverter based on DSP |
| CN102570830A (en) * | 2011-12-23 | 2012-07-11 | 上海电机学院 | Modular photovoltaic power electronic converter based on coupling inductance |
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| KR100547290B1 (en) * | 2005-06-08 | 2006-01-26 | 주식회사 피에스텍 | Method for series resonant converter control with synchronous rectifier |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1489272A (en) * | 2002-10-08 | 2004-04-14 | 中国科学院电工研究所 | Phase-shift full-bridge high-frequency inverter based on DSP |
| CN102570830A (en) * | 2011-12-23 | 2012-07-11 | 上海电机学院 | Modular photovoltaic power electronic converter based on coupling inductance |
Non-Patent Citations (1)
| Title |
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| 基于全桥LLC-SRC的隔离升压型直流变压器;陈申等;《电力电子技术》;20110731;第45卷(第7期);第111-113页 * |
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