CN104852571A - Zero-voltage-transition power supply-capacitor series connection type DC converter and working method thereof - Google Patents

Zero-voltage-transition power supply-capacitor series connection type DC converter and working method thereof Download PDF

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CN104852571A
CN104852571A CN201510259308.2A CN201510259308A CN104852571A CN 104852571 A CN104852571 A CN 104852571A CN 201510259308 A CN201510259308 A CN 201510259308A CN 104852571 A CN104852571 A CN 104852571A
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main
power supply
inductance
diode
switch
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CN104852571B (en
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高峰
陈梦星
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Shandong University
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Shandong University
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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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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 zero-voltage-transition power supply-capacitor series connection type DC converter and a working method thereof. The zero-voltage-transition power supply-capacitor series connection type DC converter comprises a power supply circuit and main power circuits. The power supply circuit comprises a DC power supply S1, a center capacitor Ccen and a DC power supply S2 which are connected in series in turn. The power supply circuit supplies power to post-stage circuits or loads. The main power circuits comprise a first main power circuit and a second main power circuit. The first main power circuit is connected in parallel between the common point of the center capacitor Ccen and the DC power supply S2 and the positive electrode point of the DC power supply S1. The second main power circuit is connected in parallel between the common point of the center capacitor Ccen and the DC power supply S1 and the negative electrode point of the DC power supply S2. Switching loss of a main switching tube and a main diode of the power supply-capacitor series connection type DC converter is greatly reduced so that conversion efficiency of the converter is greatly enhanced.

Description

Zero voltage transition power supply-capacitances in series type DC converter and method of work thereof
Technical field
The present invention relates to a kind of soft switch circuit, particularly relate to a kind of Zero voltage transition power supply-capacitances in series type DC converter and method of work thereof.
Background technology
Since modern age, along with the continuous consumption of fossil energy, the mankind are faced with unprecedented energy crisis.Photovoltaic power generation technology, due to without the need to consuming any fossil energy, for human society provides renewable electric power endlessly, obtains application widely.
Photovoltaic DC-to-AC converter as the core component of whole photovoltaic generating system, its operational efficiency and performance most important.Now widely used distributed non-isolated photovoltaic grid-connected inverter extensively adopts two-stage type topology, the more employing of first order DC-DC transfer circuit is with booster type (Boost) converter of Zero voltage transition circuit, this Zero voltage transition circuit significantly reduces the switching loss of main switch and the reverse recovery loss of main diode, is applied widely.
But there is following problem in traditional booster type with Zero voltage transition circuit (Boost) converter circuit:
(1) voltage stress of switching tube and diode is VD value, and voltage stress is larger;
(2) Hardware Engineer is when selecting semiconductor device, must select the withstand voltage semiconductor device higher than this VD value, cause high expensive;
(3) in addition, under high step-up ratio operating mode, main switch and main diode current stress are comparatively large, cause conversion efficiency to reduce.
Summary of the invention
A kind of Zero voltage transition power supply-capacitances in series type DC converter that the present invention proposes and method of work thereof, wherein the main power circuit of this Zero voltage transition power supply-capacitances in series type DC converter is divided into the first main power circuit and the second main power circuit, realizes DC power supply S respectively 1with central electric capacity C cen, DC power supply S 2with central electric capacity C cenbetween energy transferring, and the no-voltage that present invention achieves main switch is opened and is opened and zero voltage turn-off with the no-voltage of zero voltage turn-off, main diode, and auxiliary switch and booster diode increase the loss of circuit hardly.
For achieving the above object, the present invention adopts following technical scheme:
A kind of Zero voltage transition power supply-capacitances in series type DC converter, comprising: power circuit and main power circuit;
Described power circuit, comprises the DC power supply S be sequentially connected in series 1, central electric capacity C cenand DC power supply S 2, described power circuit is late-class circuit or load supplying;
Described main power circuit, comprises the first main power circuit and the second main power circuit, and described first main power circuit is connected in parallel on central electric capacity C cenwith DC power supply S 2common point and DC power supply S 1positive limit between; Described second main power circuit is connected in parallel on central electric capacity C cenwith DC power supply S 1common point and DC power supply S 2negative pole point between.
Described first main power circuit, comprising:
Main switch T 1uwith main inductance L fu, described main switch T 1ucollector electrode or drain electrode and DC power supply S 1positive pole be connected, main switch T 1uemitter-base bandgap grading or source electrode and main inductance L fuone end be connected, main inductance L futhe other end and DC power supply S 1negative pole be connected;
Described main switch T 1uwith main inductance L fucommon point and main diode D funegative electrode be connected, main diode D fuanode be connected to DC power supply S 2positive pole and central electric capacity C cencommon point;
Described DC power supply S 1positive pole connects auxiliary switch pipe T 2ucollector electrode or drain electrode, auxiliary switch pipe T 2uemitter-base bandgap grading or source electrode be connected to resonant inductance L ruone end, resonant inductance L ruthe other end be connected to main switch T 1uwith main inductance L fucommon point;
Described resonant inductance L ruwith auxiliary switch pipe T 2ucommon point connect auxiliary diode D 1unegative electrode, auxiliary diode D 1uanode connect auxiliary diode D 2unegative electrode, auxiliary diode D 2uanode be connected to DC power supply S 2positive pole and central electric capacity C cencommon point;
Described main diode D funegative electrode be connected to electric capacity C buone end, electric capacity C buthe other end be connected to auxiliary diode D 1uwith auxiliary diode D 2ucommon point;
Described main switch T 1uemitter-base bandgap grading and collector electrode two ends be parallel with resonant capacitance C ru, or main switch T 1usource electrode with drain electrode two ends be parallel with resonant capacitance C ru.
Described resonant capacitance C rufor main switch T 1uparasitic capacitance or external capacitor.
Described second main power circuit, comprising:
Main switch T 1dwith main inductance L fd, described main switch T 1demitter-base bandgap grading or source electrode be connected to DC power supply S 2negative pole, main switch T 1dcollector electrode or drain electrode be connected to main inductance L fdone end, main inductance L fdthe other end connect DC power supply S 2positive pole;
Described main switch T 1dwith main inductance L fdcommon point and main diode D fdanode be connected, main diode D fdnegative electrode be connected to central electric capacity C cenwith DC power supply S 1the common point of negative pole;
Described DC power supply S 2negative pole connects auxiliary switch pipe T 2demitter-base bandgap grading or source electrode, auxiliary switch pipe T 2dcollector electrode or drain electrode connect resonant inductance L rdone end, resonant inductance L rdthe other end be connected to main switch T 1dwith main inductance L fdcommon point place;
Described resonant inductance L rdwith described auxiliary switch pipe T 2dcommon point connect auxiliary diode D 1danode, auxiliary diode D 1dnegative electrode connect auxiliary diode D 2danode, auxiliary diode D 2dnegative electrode be connected to central electric capacity C cenwith DC power supply S 1the common point of negative pole;
Described main diode D fdanode connect electric capacity C bdone end, electric capacity C bdthe other end be connected to auxiliary diode D 1dwith auxiliary diode D 2dcommon point place;
Described main switch T 1demitter-base bandgap grading and collector electrode two ends be parallel with resonant capacitance C rd, or main switch T 1dsource electrode with drain electrode two ends be parallel with resonant capacitance C rd.
Described resonant capacitance C rdfor main switch T 1dparasitic capacitance or external capacitor.
Described late-class circuit is the power conversion circuit containing switch element or linear element.
A method of work for Zero voltage transition power supply-capacitances in series type DC converter, comprising:
Main switch T 1u, T 1dwith auxiliary switch pipe T 2u, T 2dits conducting and the shutoff separately of all controlled control circui, states the main switch T in the second main power circuit 1d, auxiliary switch pipe T 2dcontrol timing sequence and the first main power circuit in main switch T 1u, auxiliary switch pipe T 2ucontrol timing sequence identical.
Main switch T in described first main power circuit 1uwith auxiliary switch pipe T 2useven operation modes are comprised in a switch periods of control circuit:
(1) t 0≤ t<t 2the mode 1 in stage:
T 0moment, auxiliary switch pipe T 2uopen-minded, resonant inductance L ruboth end voltage is V s1+ V cen; t 1moment, main diode D fuelectric current reduces to 0; t 2moment reaches reverse recovery current peak value, main diode D fuend completely, wherein t 0<t 1<t 2;
(2) t 2≤ t<t 3the mode 2 in stage:
From t 2moment, resonant inductance L ruwith resonant capacitance C rualong path L ru– C ru– T 2uthere is parallel resonance, resonant capacitance C ruelectric discharge, resonant inductance L rucharging; Until t 3moment, resonant inductance L ruelectric current reaches its maximum, resonant capacitance C ruvoltage reaches zero;
(3) t 3≤ t<t 4the mode 3 in stage:
T 3moment, resonant capacitance C ruvoltage reaches zero, subsequently main switch T 1uanti-paralleled diode conducting, resonant inductance L ruan electric current part is through main inductance L fuflow back to DC power supply, a part is through main switch T 1uanti-and diode, auxiliary switch pipe T 2uflow back to resonant inductance L ru;
(4) t 4≤ t<t 5the mode 4 in stage:
T 4moment, to main switch T 1ugate pole apply open signal, main switch T 1uno-voltage is open-minded; Meanwhile, to auxiliary switch pipe T 2ugate pole apply cut-off signals, auxiliary switch pipe T 2uzero voltage turn-off; Subsequently, auxiliary diode D 1uno-voltage is open-minded, resonant inductance L ruwith electric capacity C bualong path L ru– C bu– D 1uthere is series resonance;
(5) t 5≤ t<t 6the mode 5 in stage:
T 5in the moment, series resonance terminates, resonant inductance L ruelectric current is zero, electric capacity C buvoltage is V s1+ V cen; DC power supply S 1electric current flows through main switch T 1uwith main inductance L fu, DC power supply S 1for main inductance L fucharging;
(6) t 6≤ t<t 7the mode 6 in stage:
T 6moment, to main switch T 1ugate pole apply cut-off signals, main switch T 1uzero voltage turn-off; Subsequently, a part of main inductance L fuelectric current is through L fu– S 1– C ruloop, another part main inductance L fucircuit current is through L fu– C cen– D 2u– C buloop;
(7) t 7≤ t<t 8the mode 7 in stage:
From t 7moment, main diode D fuopen-minded; Main inductance L fuelectric current flows through L fu– C cen– D fuloop, main inductance L fufor central electric capacity C cencharging; t 8moment, auxiliary switch pipe T 2uconducting again, a switch periods of Zero voltage transition power supply-capacitances in series type DC converter terminates; Power circuit is late-class circuit or load supplying in above process.
Beneficial effect of the present invention is:
(1) the present invention greatly reduces the switching loss of power supply-capacitances in series type DC converter main switch and main diode, substantially increases the conversion efficiency of converter;
(2) Zero voltage transition power supply of the present invention-capacitances in series type DC converter has boost function, compare traditional DC voltage booster circuit, this circuit is under the prerequisite not increasing current stress, substantially reduce the voltage stress of switching tube and diode, thus greatly reduce the switching loss of power semiconductor; Zero voltage transition auxiliary circuit of the present invention increases the loss of system hardly, thus the efficiency of entirety obtains and greatly improves;
(3) Zero voltage transition power supply of the present invention-capacitances in series type DC converter solves the voltage and the higher problem of current stress that conventional boost type (Boost) converter exists well, achieve the maximum power point tracking to two pieces or polylith independent photovoltaic array and DC boosting function simultaneously, be particularly suitable in distributed photovoltaic combining inverter, there is very high practical value; And greatly reduce the reverse recovery current peak value of power supply-main diode of capacitances in series type DC converter, thus effectively reduce the EMI of system.
Accompanying drawing explanation
Fig. 1 is Zero voltage transition of the present invention power supply-capacitances in series type DC converter structural representation;
Fig. 2 is control signal and each device voltage, the electric current time domain beamformer of the present invention first main power circuit;
Fig. 3 (a) is for the present invention first main power circuit is at switch mode 1 (t 0≤ t<t 2) time equivalent circuit diagram;
Fig. 3 (b) is for the present invention first main power circuit is at switch mode 2 (t 2≤ t<t 3) time equivalent circuit diagram;
Fig. 3 (c) is for the present invention first main power circuit is at switch mode 3 (t 3≤ t<t 4) time equivalent circuit diagram;
Fig. 3 (d) is for the present invention first main power circuit is at switch mode 4 (t 4≤ t<t 5) time equivalent circuit diagram;
Fig. 3 (e) is for the present invention first main power circuit is at switch mode 5 (t 5≤ t<t 6) time equivalent circuit diagram;
Fig. 3 (f) is for the present invention first main power circuit is at switch mode 6 (t 6≤ t<t 7) time equivalent circuit diagram;
Fig. 3 (g) is for the present invention first main power circuit is at switch mode 7 (t 7≤ t<t 8) time equivalent circuit diagram.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention will be further described:
As shown in Figure 1, a kind of Zero voltage transition power supply-capacitances in series type DC converter, comprising: power circuit and main power circuit;
Described power circuit, comprises the DC power supply S be sequentially connected in series 1, central electric capacity C cenand DC power supply S 2, described power circuit is late-class circuit or load supplying;
Described main power circuit, comprises the first main power circuit and the second main power circuit, and described first main power circuit is connected in parallel on central electric capacity C cenwith DC power supply S 2common point and DC power supply S 1positive limit between; Described second main power circuit is connected in parallel on central electric capacity C cenwith DC power supply S 1common point and DC power supply S 2negative pole point between.
Described first main power circuit, comprising:
Main switch T 1uwith main inductance L fu, described main switch T 1ucollector electrode or drain electrode and DC power supply S 1positive pole be connected, main switch T 1uemitter-base bandgap grading or source electrode and main inductance L fuone end be connected, main inductance L futhe other end and DC power supply S 1negative pole be connected;
Described main switch T 1uwith main inductance L fucommon point and main diode D funegative electrode be connected, main diode D fuanode be connected to DC power supply S 2positive pole and central electric capacity C cencommon point;
Described DC power supply S 1positive pole connects auxiliary switch pipe T 2ucollector electrode or drain electrode, auxiliary switch pipe T 2uemitter-base bandgap grading or source electrode be connected to resonant inductance L ruone end, resonant inductance L ruthe other end be connected to main switch T 1uwith main inductance L fucommon point;
Described resonant inductance L ruwith auxiliary switch pipe T 2ucommon point connect auxiliary diode D 1unegative electrode, auxiliary diode D 1uanode connect auxiliary diode D 2unegative electrode, auxiliary diode D 2uanode be connected to DC power supply S 2positive pole and central electric capacity C cencommon point;
Described main diode D funegative electrode be connected to electric capacity C buone end, electric capacity C buthe other end be connected to auxiliary diode D 1uwith auxiliary diode D 2ucommon point;
Described main switch T 1uemitter-base bandgap grading and collector electrode two ends be parallel with resonant capacitance C ru, or main switch T 1usource electrode with drain electrode two ends be parallel with resonant capacitance C ru.
Described resonant capacitance C rufor main switch T 1uparasitic capacitance or external capacitor.
Described second main power circuit, comprising:
Main switch T 1dwith main inductance L fd, described main switch T 1demitter-base bandgap grading or source electrode be connected to DC power supply S 2negative pole, main switch T 1dcollector electrode or drain electrode be connected to main inductance L fdone end, main inductance L fdthe other end connect DC power supply S 2positive pole;
Described main switch T 1dwith main inductance L fdcommon point and main diode D fdanode be connected, main diode D fdnegative electrode be connected to central electric capacity C cenwith DC power supply S 1the common point of negative pole;
Described DC power supply S 2negative pole connects auxiliary switch pipe T 2demitter-base bandgap grading or source electrode, auxiliary switch pipe T 2dcollector electrode or drain electrode connect resonant inductance L rdone end, resonant inductance L rdthe other end be connected to main switch T 1dwith main inductance L fdcommon point place;
Described resonant inductance L rdwith described auxiliary switch pipe T 2dcommon point connect auxiliary diode D 1danode, auxiliary diode D 1dnegative electrode connect auxiliary diode D 2danode, auxiliary diode D 2dnegative electrode be connected to central electric capacity C cenwith DC power supply S 1the common point of negative pole;
Described main diode D fdanode connect electric capacity C bdone end, electric capacity C bdthe other end be connected to auxiliary diode D 1dwith auxiliary diode D 2dcommon point place;
Described main switch T 1demitter-base bandgap grading and collector electrode two ends be parallel with resonant capacitance C rd, or main switch T 1dsource electrode with drain electrode two ends be parallel with resonant capacitance C rd.
Described resonant capacitance C rdfor main switch T 1dparasitic capacitance or external capacitor.
Described late-class circuit is the power conversion circuit containing switch element or linear element.
The method of work of the Zero voltage transition power supply-capacitances in series type DC converter of the present embodiment, comprising:
Main switch T 1u, T 1dwith described auxiliary switch pipe T 2u, T 2dits conducting and the shutoff separately of all controlled control circui, wherein, control circuit can be pwm pulse circuit for generating; In first main power circuit, main switch T 1ucontrol signal and auxiliary switch pipe T 2ucontrol signal sequential as shown in Figure 2; Main switch T in second main power circuit 1d, auxiliary switch pipe T 2dcontrol timing sequence and the first main power circuit in main switch T 1u, auxiliary switch pipe T 2ucontrol timing sequence identical.
In Fig. 2, V gE, T1urepresent main switch T 1ugate voltage, V gE, T2urepresent auxiliary switch pipe T 2ugate voltage, I lrurepresentative flows through resonant inductance L ruelectric current, V cBurepresent electric capacity C buboth end voltage, V cE, T1urepresent main switch T 1ucollection-emitter voltage, I c, T1urepresent main switch T 1ucollector current, V dFurepresent main diode D fboth end voltage, I dFurepresentative flows through main diode D felectric current, V t2urepresent auxiliary switch pipe T 2ucollection-emitter voltage, V d1urepresent auxiliary diode D 1uboth end voltage, V d2urepresent auxiliary diode D 2uboth end voltage.
Because the second main power circuit is substantially identical with the first main power circuit operation principle, describe the operation principle of the first main power circuit in detail at this, the operation principle of the second main power circuit can be analogized by the first main power circuit and obtains.
First main power circuit of the present invention has seven operation modes in a switch periods of control circuit, respectively as shown in Fig. 3 (a) ~ Fig. 3 (g), will carry out labor below to each operation mode:
(1) mode 1 (t 0≤ t<t 2):
As shown in Fig. 3 (a), at t 0before moment, main diode D fuconducting, main inductance electric current I futhrough main inductance L fu, central electric capacity C cenwith main diode D fucirculation, main inductance L fufor central electric capacity C cencharging.T 0moment, auxiliary switch pipe T 2uopen-minded, resonant inductance L ruboth end voltage is V s1+ V cen, its electric current linearly rises, main diode D fuelectric current linearly declines.T 1moment, main diode D fuelectric current reduces to 0; Subsequently, due to the reverse recovery characteristic of main diode, main diode D fuelectric current negative sense increases.T 2moment reaches reverse recovery current peak value, main diode D fuend completely.Because resonant inductance limits main diode D futhe di/dt value of electric current, main diode D fusoft switching, is down to minimum by reverse recovery loss.Meanwhile, by DC power supply S 1, central electric capacity C cen, DC power supply S 2the series circuit of composition is rear class power conversion circuit or load supplying, wherein t 0<t 1<t 2.
(2) mode 2 (t 2≤ t<t 3):
As shown in Fig. 3 (b), from t 2moment, resonant inductance L ruwith resonant capacitance C rualong path L ru– C ru-T 2uthere is parallel resonance, resonant capacitance C ruelectric discharge, resonant inductance L rucharging.Until t 3moment, resonant inductance L ruelectric current reaches its maximum, resonant capacitance C ruvoltage reaches zero.This is main switch T 1uno-voltage open the condition of creating.Resonant inductance L rucurrent waveform and resonant capacitance C ruvoltage waveform as shown in Figure 2.Meanwhile, by DC power supply S 1, central electric capacity C cen, DC power supply S 2the series circuit of composition is rear class power conversion circuit or load supplying.
(3) mode 3 (t 3≤ t<t 4):
As shown in Fig. 3 (c), t 3moment, resonant capacitance C ruvoltage reaches zero, subsequently main switch T 1uanti-paralleled diode conducting, resonant inductance L ruan electric current part is through main inductance L fuflow back to DC power supply, a part is through main switch T 1uanti-and diode, auxiliary switch pipe T 2uflow back to resonant inductance L ru.Meanwhile, by DC power supply S 1, central electric capacity C cen, DC power supply S 2the series circuit of composition is rear class power conversion circuit or load supplying.
(4) mode 4 (t 4≤ t<t 5):
As shown in Fig. 3 (d), t 4moment, to main switch T 1ugate pole apply open signal, main switch T 1uno-voltage is open-minded, begins through electric current.Meanwhile, to auxiliary switch pipe T 2ugate pole apply cut-off signals, auxiliary switch pipe T 2uzero voltage turn-off.Subsequently, auxiliary diode D 1uno-voltage is open-minded, resonant inductance L ruwith electric capacity C bualong path L ru– C bu– D 1uthere is series resonance.Resonant inductance L ruelectric discharge, its electric current declines; Electric capacity C bucharged, its both end voltage raises.By choose reasonable electric capacity C bucapacitance, can be implemented in resonance finish time, electric capacity C buboth end voltage is just V s1+ V cen.Meanwhile, by DC power supply S 1, central electric capacity C cen, DC power supply S 2the series circuit of composition is rear class power conversion circuit or load supplying.
(5) mode 5 (t 5≤ t<t 6):
As shown in Fig. 3 (e), t 5in the moment, series resonance terminates, resonant inductance L ruelectric current is zero, electric capacity C buvoltage is V s1+ V cen.DC power supply S 1electric current flows through main switch T 1uwith main inductance L fu, DC power supply S 1for main inductance L fucharging.Meanwhile, by DC power supply S 1, central electric capacity C cen, DC power supply S 2the series circuit of composition is rear class power conversion circuit or load supplying.
(6) mode 6 (t 6≤ t<t 7):
As shown in Fig. 3 (f), t 6moment, to main switch T 1ugate pole apply cut-off signals, main switch T 1uzero voltage turn-off.Subsequently, a part of main inductance L fuelectric current is through L fu– S 1– C ruloop, another part main inductance L fucircuit current is through L fu– C cen– D 2u– C buloop.Resonant capacitance C rucharged, its voltage raises; Electric capacity C buelectric discharge, its voltage reduces.Meanwhile, by DC power supply S 1, central electric capacity C cen, DC power supply S 2the series circuit of composition is rear class power conversion circuit or load supplying.
(7) mode 7 (t 7≤ t<t 8):
As shown in Fig. 3 (g), t 7moment, resonant capacitance C ruvoltage rises to V s1+ V cen, electric capacity C simultaneously buvoltage is down to zero.From t 7moment, main diode D fuopen-minded.Main inductance L fuelectric current flows through L fu– C cen– D fuloop, main inductance L fufor central electric capacity C cencharging.Meanwhile, by DC power supply S 1, central electric capacity C cen, DC power supply S 2the series circuit of composition is rear class power conversion circuit or load supplying.T 8moment, auxiliary switch pipe T 2uconducting again, a switch periods of Zero voltage transition power supply-capacitances in series type DC converter terminates.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.

Claims (8)

1. Zero voltage transition power supply-capacitances in series type DC converter, is characterized in that, comprising: power circuit and main power circuit;
Described power circuit, comprises the DC power supply S be sequentially connected in series 1, central electric capacity C cenand DC power supply S 2, described power circuit is late-class circuit or load supplying;
Described main power circuit, comprises the first main power circuit and the second main power circuit, and described first main power circuit is connected in parallel on central electric capacity C cenwith DC power supply S 2common point and DC power supply S 1positive limit between; Described second main power circuit is connected in parallel on central electric capacity C cenwith DC power supply S 1common point and DC power supply S 2negative pole point between.
2. a kind of Zero voltage transition power supply-capacitances in series type DC converter as claimed in claim 1, it is characterized in that, described first main power circuit, comprising:
Main switch T 1uwith main inductance L fu, described main switch T 1ucollector electrode or drain electrode and DC power supply S 1positive pole be connected, main switch T 1uemitter-base bandgap grading or source electrode and main inductance L fuone end be connected, main inductance L futhe other end and DC power supply S 1negative pole be connected;
Described main switch T 1uwith main inductance L fucommon point and main diode D funegative electrode be connected, main diode D fuanode be connected to DC power supply S 2positive pole and central electric capacity C cencommon point;
Described DC power supply S 1positive pole connects auxiliary switch pipe T 2ucollector electrode or drain electrode, auxiliary switch pipe T 2uemitter-base bandgap grading or source electrode be connected to resonant inductance L ruone end, resonant inductance L ruthe other end be connected to main switch T 1uwith main inductance L fucommon point;
Described resonant inductance L ruwith auxiliary switch pipe T 2ucommon point connect auxiliary diode D 1unegative electrode, auxiliary diode D 1uanode connect auxiliary diode D 2unegative electrode, auxiliary diode D 2uanode be connected to DC power supply S 2positive pole and central electric capacity C cencommon point;
Described main diode D funegative electrode be connected to electric capacity C buone end, electric capacity C buthe other end be connected to auxiliary diode D 1uwith auxiliary diode D 2ucommon point;
Described main switch T 1uemitter-base bandgap grading and collector electrode two ends be parallel with resonant capacitance C ru, or main switch T 1usource electrode with drain electrode two ends be parallel with resonant capacitance C ru.
3. a kind of Zero voltage transition power supply-capacitances in series type DC converter as claimed in claim 2, is characterized in that, described resonant capacitance C rufor main switch T 1uparasitic capacitance or external capacitor.
4. a kind of Zero voltage transition power supply-capacitances in series type DC converter as claimed in claim 1, it is characterized in that, described second main power circuit, comprising:
Main switch T 1dwith main inductance L fd, described main switch T 1demitter-base bandgap grading or source electrode be connected to DC power supply S 2negative pole, main switch T 1dcollector electrode or drain electrode be connected to main inductance L fdone end, main inductance L fdthe other end connect DC power supply S 2positive pole;
Described main switch T 1dwith main inductance L fdcommon point and main diode D fdanode be connected, main diode D fdnegative electrode be connected to central electric capacity C cenwith DC power supply S 1the common point of negative pole;
Described DC power supply S 2negative pole connects auxiliary switch pipe T 2demitter-base bandgap grading or source electrode, auxiliary switch pipe T 2dcollector electrode or drain electrode connect resonant inductance L rdone end, resonant inductance L rdthe other end be connected to main switch T 1dwith main inductance L fdcommon point place;
Described resonant inductance L rdwith described auxiliary switch pipe T 2dcommon point connect auxiliary diode D 1danode, auxiliary diode D 1dnegative electrode connect auxiliary diode D 2danode, auxiliary diode D 2dnegative electrode be connected to central electric capacity C cenwith DC power supply S 1the common point of negative pole;
Described main diode D fdanode connect electric capacity C bdone end, electric capacity C bdthe other end be connected to auxiliary diode D 1dwith auxiliary diode D 2dcommon point place;
Described main switch T 1demitter-base bandgap grading and collector electrode two ends be parallel with resonant capacitance C rd, or main switch T 1dsource electrode with drain electrode two ends be parallel with resonant capacitance C rd.
5. a kind of Zero voltage transition power supply-capacitances in series type DC converter as claimed in claim 4, is characterized in that, described resonant capacitance C rdfor main switch T 1dparasitic capacitance or external capacitor.
6. a kind of Zero voltage transition power supply-capacitances in series type DC converter as claimed in claim 1, is characterized in that, described late-class circuit is the power conversion circuit containing switch element or linear element.
7. a method of work for Zero voltage transition power supply according to claim 1-capacitances in series type DC converter, is characterized in that, comprising:
Main switch T 1u, T 1dwith auxiliary switch pipe T 2u, T 2dits conducting and the shutoff separately of all controlled control circui, the main switch T in the second main power circuit 1d, auxiliary switch pipe T 2dcontrol timing sequence and the first main power circuit in main switch T 1u, auxiliary switch pipe T 2ucontrol timing sequence identical.
8. the method for work of Zero voltage transition power supply-capacitances in series type DC converter as claimed in claim 7, is characterized in that, the main switch T in described first main power circuit 1uwith auxiliary switch pipe T 2useven operation modes are comprised in a switch periods of control circuit:
(1) t 0≤ t<t 2the mode 1 in stage:
T 0moment, auxiliary switch pipe T 2uopen-minded, resonant inductance L ruboth end voltage is V s1+ V cen; t 1moment, main diode D fuelectric current reduces to 0; t 2moment reaches reverse recovery current peak value, main diode D fuend completely, wherein t 0<t 1<t 2;
(2) t 2≤ t<t 3the mode 2 in stage:
From t 2moment, resonant inductance L ruwith resonant capacitance C rualong path L ru– C ru– T 2uthere is parallel resonance, resonant capacitance C ruelectric discharge, resonant inductance L rucharging; Until t 3moment, resonant inductance L ruelectric current reaches its maximum, resonant capacitance C ruvoltage reaches zero;
(3) t 3≤ t<t 4the mode 3 in stage:
T 3moment, resonant capacitance C ruvoltage reaches zero, subsequently main switch T 1uanti-paralleled diode conducting, resonant inductance L ruan electric current part is through main inductance L fuflow back to DC power supply, a part is through main switch T 1uanti-and diode, auxiliary switch pipe T 2uflow back to resonant inductance L ru;
(4) t 4≤ t<t 5the mode 4 in stage:
T 4moment, to main switch T 1ugate pole apply open signal, main switch T 1uno-voltage is open-minded; Meanwhile, to auxiliary switch pipe T 2ugate pole apply cut-off signals, auxiliary switch pipe T 2uzero voltage turn-off; Subsequently, auxiliary diode D 1uno-voltage is open-minded, resonant inductance L ruwith electric capacity C bualong path L ru– C bu– D 1uthere is series resonance;
(5) t 5≤ t<t 6the mode 5 in stage:
T 5in the moment, series resonance terminates, resonant inductance L ruelectric current is zero, electric capacity C buvoltage is V s1+ V cen; DC power supply S 1electric current flows through main switch T 1uwith main inductance L fu, DC power supply S 1for main inductance L fucharging;
(6) t 6≤ t<t 7the mode 6 in stage:
T 6moment, to main switch T 1ugate pole apply cut-off signals, main switch T 1uzero voltage turn-off; Subsequently, a part of main inductance L fuelectric current is through L fu– S 1– C ruloop, another part main inductance L fucircuit current is through L fu– C cen– D 2u– C buloop;
(7) t 7≤ t<t 8the mode 7 in stage:
From t 7moment, main diode D fuopen-minded; Main inductance L fuelectric current flows through L fu– C cen– D fuloop, main inductance L fufor central electric capacity C cencharging; t 8moment, auxiliary switch pipe T 2uconducting again, a switch periods of Zero voltage transition power supply-capacitances in series type DC converter terminates; Power circuit is late-class circuit or load supplying in above process.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107659141A (en) * 2017-11-01 2018-02-02 广东工业大学 A kind of converter circuit
CN117458874A (en) * 2023-12-26 2024-01-26 深圳市永联科技股份有限公司 DC-DC conversion circuit, control method and related products

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107659141A (en) * 2017-11-01 2018-02-02 广东工业大学 A kind of converter circuit
CN117458874A (en) * 2023-12-26 2024-01-26 深圳市永联科技股份有限公司 DC-DC conversion circuit, control method and related products
CN117458874B (en) * 2023-12-26 2024-03-26 深圳市永联科技股份有限公司 DC-DC conversion circuit, control method and related products

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