CN113541476B - Symmetric double-Boost circuit based on soft switch and implementation method - Google Patents
Symmetric double-Boost circuit based on soft switch and implementation method Download PDFInfo
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- CN113541476B CN113541476B CN202110813852.2A CN202110813852A CN113541476B CN 113541476 B CN113541476 B CN 113541476B CN 202110813852 A CN202110813852 A CN 202110813852A CN 113541476 B CN113541476 B CN 113541476B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/08—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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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 soft switch-based symmetric double-Boost circuit and an implementation method thereof, and the symmetric double-Boost circuit comprises a symmetric soft switch topological circuit and a symmetric double-Boost topological circuit, wherein the symmetric double-Boost topological circuit comprises two symmetrical same-type Boost basic topological circuits, the two Boost basic topological circuits are symmetrically connected to realize medium-high power DC-DC rectification, the symmetric soft switch topological structure comprises two symmetric soft switch topological structures, and the two soft switch topological structures are respectively correspondingly arranged in the two Boost basic topological circuits. The symmetrical soft switching topological circuit is built in the symmetrical double-Boost topological circuit, so that the power tube S is realized b The zero current turn-off condition and the zero voltage turn-on condition, and the symmetrical soft switch topological circuit enables the power diode VD 1 、VD 2 Working in the zero-current turn-off and zero-voltage turn-on state, reducing the power switch device S as a whole b And a power two tube VD 1 、VD 2 Loss and converter efficiency are improved.
Description
Technical Field
The invention relates to the technical field of rectifying circuits, in particular to a symmetric double-Boost circuit based on a soft switch and an implementation method.
Background
A "rectifying circuit" (rectifying circuit) is a circuit that converts ac power into dc power. Most of the rectifier circuits are composed of a transformer, a main rectifier circuit, a filter and the like. It is widely used in the fields of speed regulation of DC motors, excitation regulation of generators, electrolysis, electroplating and the like. After the 70 s of the 20 th century, the main circuit is composed of silicon rectifier diodes and thyristors. The filter is connected between the main circuit and the load and is used for filtering alternating current components in the pulsating direct current voltage. Whether the transformer is arranged or not depends on the specific situation. The transformer is used for matching the alternating current input voltage and the direct current output voltage and electrically isolating the alternating current power grid from the rectifying circuit.
The rectifier circuit is used for converting alternating current with lower voltage output by the alternating current voltage reduction circuit into unidirectional pulsating direct current, namely the rectification process of the alternating current, and mainly comprises rectifier diodes. The voltage after passing through the rectifier circuit is not an alternating voltage but a mixed voltage containing a direct voltage and an alternating voltage.
The existing symmetrical double BOOST circuit has few switching devices and can operate in a low switching frequency and high power mode. The three-phase single-switch uncontrolled BOOST rectifier not only can be independently applied to DC-DC boosting occasions, but also can be applied to a three-phase single-switch uncontrolled BOOST rectifier forming a hybrid rectifier in AC-DC medium-high voltage occasions. However, the existing symmetrical double-BOOST circuit lacks a soft switch design, cannot reduce the power loss of the symmetrical double-BOOST converter, has limited improvement degree on the operation efficiency of a circuit of the circuit or a novel circuit formed by the circuit and other converters, and leads to high loss of a circuit power tube and low efficiency of the converter on the whole.
Disclosure of Invention
The invention aims to provide a symmetrical double-Boost circuit based on a soft switch, which aims to solve the technical problems of high power tube loss and low conversion efficiency in the prior art.
In order to solve the technical problems, the invention specifically provides the following technical scheme:
a symmetrical double-Boost circuit based on soft switches comprises a symmetrical soft-switch topological circuit and a symmetrical double-Boost topological circuit, wherein the symmetrical double-Boost topological circuit comprises two symmetrical same-type Boost basic topological circuits, the two Boost basic topological circuits are symmetrically connected to realize medium-high power DC-DC rectification, the symmetrical soft-switch topological structure comprises two symmetrical soft-switch topological structures, the two soft-switch topological structures are respectively and correspondingly arranged in the two Boost basic topological circuits, and the two soft-switch topological structures respectively realize zero-voltage switching-on and zero-current switching-off of a power tube and a power diode in the two Boost basic topological circuits so as to reduce power loss of the two Boost basic topological circuits and improve rectification conversion efficiency of the two Boost basic topological circuits.
As a preferred scheme of the invention, the symmetrical double-Boost topological circuit comprises a power supply E and a power tube S b Inductance L 1, Inductance L 2 Power diode VD 1 Power diode VD 2 Capacitance C 1 Capacitance C 2 Load resistance R, said inductance L 1, And the inductance L 2 Equal, the power diode VD 1 And said power diode VD 2 And are equal to each other, wherein,
the positive pole of the power supply E and the inductor L 1 Is electrically connected with the inductor L 1 Is connected with the power tube S at the other end respectively b Second pin of (1), the power diode VD 1 Is electrically connected with the power diode VD 1 Respectively with the capacitor C 1 One end of the power supply E is electrically connected with one end of the load resistor R, and the negative electrode of the power supply E is connected with the inductor L 2 One end of the inductor L is electrically connected with the inductor 2 Is connected with the power tube S at the other end respectively b Third pin of (2) and the power diode VD 2 Is electrically connected with the power diode VD 2 Is connected to the capacitor C 2 One end of the capacitor C is electrically connected with the other end of the load resistor R 1 And the other end of the capacitor C 2 The other end of the first and second electrodes is electrically connected.
As a preferred solution of the present invention, the symmetric soft switching topology circuit includes an inductor L r1 Inductance L r2 Capacitor C s1 Capacitor C s2 Capacitor C r1 Capacitance C r2 Diode D 1 Diode D 2 Diode D 3 Diode D 4 Diode D 5 Diode D 6 Said inductance L r1 And the inductance L r2 Equal, the capacitance C s1 And said capacitor C s2 Equal, the capacitance C r1 And said capacitor C r2 Equal, the diode D 1 And the diode D 4 Equal, the diode D 2 And saidDiode D 5 Equal, the diode D 3 And the diode D 6 Equal, said capacitance C s1 Capacitor C s2 Is the power tube S b Providing a zero current turn-off condition, said inductance L r1 Inductor L r2 Is the power tube S b Providing a zero-voltage switching-on condition, wherein the two soft switch topological structures are power diodes VD 1 、VD 2 Providing a zero current off condition and a zero voltage on condition, wherein,
the inductance L r1 One terminal of (1), diode D 1 Respectively connected with the power tube S b The second pin of the inductor L is electrically connected with the first pin of the inductor r1 And the other end of the power diode VD 1 Is electrically connected with the diode D 1 And the other end of the diode D is respectively connected with the diode D 2 One terminal of (1), a capacitor C s1 One end of the capacitor C is electrically connected with the first end of the capacitor s1 And the other end of the capacitor C 1 The other end of the diode D is electrically connected with the diode 2 Is connected to the capacitor C r1 One end of (1), diode D 3 Is electrically connected with the capacitor C r1 And the other end of the inductor L r1 The other end of the diode D is electrically connected with the diode 3 And the other end of said power diode VD 1 The other end of the first and second electrodes is electrically connected;
the inductance L r2 One end of (1), the second diode D 4 One end of each of the first and second power transistors S 2 Pin of (2) electrically connected to inductor L r2 And the other end of the power diode VD 2 Is electrically connected with the first diode D 4 And the other end of the diode D is respectively connected with the diode D 5 One terminal of (1), a capacitor C s2 One end of the capacitor C is electrically connected with the first end of the capacitor s2 And the other end of the capacitor C 2 The other end of the diode D is electrically connected with the diode 5 Is connected to the capacitor C r2 One terminal of (1), diode D 6 One end of the capacitor C is electrically connected with the first end of the capacitor r2 And the other end of the inductor L r2 The other end of the diode D is electrically connected with the first end of the diode 6 Another end of (b) andpower diode VD 2 The other end of the first and second electrodes is electrically connected.
As a preferred aspect of the present invention, the switching cycle of the symmetric soft-switching topology circuit comprises seven operating phases, wherein,
t of the first operating phase comprising a switching cycle 0 ～t 1 Stage (2): at said t 0 ～t 1 At a moment, the switch tube S b The power diode VD1 and the power diode VD2 are kept in a zero-voltage conducting state;
t of the second operating phase comprising a switching cycle 1 ～t 2 Stage, the power tube S b Changing from an off state to a zero current conducting state, the power diode VD 1 Power diode VD 2 The zero voltage on state is changed into a zero current off state, and the capacitor C r1 Capacitor C r2 Remain in a fully discharged state;
t of the third operating phase comprising a switching cycle 2 ～t 3 Stage, the power tube S b Is maintained in a conducting state, the power diode VD 1 Remaining in the off state, the inductance L r1 Capacitor C r1 Capacitor C r2 An inductor L r2 Is maintained in series resonance state, and the capacitance C s1 Capacitor C s2 Is maintained in a discharged state, the capacitor C r1 Capacitor C r2 Remaining in a charged state;
t of the fourth operating phase comprising a switching period 3 ～t 4 Stage, the power tube S b Is maintained in a conducting state, the power diode VD 1 Power diode VD 2 Remaining in an off state, the diode D 1 And a diode D 4 Is maintained in a conducting state, the inductance L r1 And a capacitor C r1 Is maintained in series resonance state, and the capacitor C r2 And an inductance L r2 Is maintained in series resonance state, and the capacitor C s1 Capacitor C s2 Is maintained in a fully discharged state, the capacitor C r1 Capacitor C r2 Remaining in a charged state;
t of the fifth operating phase comprising a switching cycle 4 ～t 5 Stage, the power tube S b Is maintained in a conducting state, the power diode VD 1 Power diode VD 2 Remaining in an off state, the diode D 1 Diode D 2 And a diode D 4 Diode D 5 Remaining in an off state, the capacitor C r1 Capacitor C r2 Maintained in a full state;
t of the sixth operating phase comprising a switching cycle 5 ～t 6 Stage, the power tube S b The power diode VD is changed from a conducting state to a zero-current turn-off state 1 Power diode VD 2 Remaining in the off state, the diode D 1 Diode D 3 And a diode D 4 Diode D 6 Is maintained in a conducting state, and the capacitor C s1 And a capacitor C s2 Is maintained in a charged state, the capacitor C r1 、C r2 Remain in a discharged state;
t of the seventh operating phase comprising a switching cycle 6 ～t 7 Stage, the power tube S b Kept in an off state, the power diode VD 1 Power diode VD 2 Remaining in the off state, the diode D 3 And a diode D 6 Is maintained in a conducting state, the capacitor C s1 And a capacitor C s2 Remaining in a full state, said capacitance C r1 Capacitor C r2 And is maintained in a discharged state.
As a preferred aspect of the present invention, the duration of the second, third and fourth working phases of the seven working phases is determined by an electrical component, and the mathematical expressions of the duration of the second, third and fourth working phases are:
t in the second working phase 1 ～t 2 The duration of the phase is t 1～2 T is said 1～2 The quantization expression of (a) is:
in the formula, L r ＝L r1 ＝L r2 ，L r1 、L r2 Respectively characterized by inductance L r1 、L r2 ，I in For the input current of the power supply E, U o Is the voltage across the load resistor R;
t in the working phase 2 ～t 3 The duration of the phase is t 2～3 T is said 2～3 The quantization expression of (a) is:
in the formula (I), the compound is shown in the specification,
C r ＝C r1 ＝C r2 ，C s ＝C s1 ＝C s2 ，L r ＝L r1 ＝L r2 ，C r1 、C r2 respectively characterized by a capacitance C r1 、C r2 ，C s1 、C s2 Respectively characterized by a capacitance C s1 、C s2 ，L r1 、L r2 Respectively characterized by inductance L r1 、L r2 ；
T in the working phase 3 ～t 4 The duration of the phase is t 3～4 Said t is 3～4 The quantization expression of (a) is:
in the formula, C r ＝C r1 ＝C r2 ，L r ＝L r1 ＝L r2 C r1 、C r2 Respectively characterized by a capacitance C r1 、C r2 ，L r1 、L r2 Respectively characterized by electricityFeeling L r1 、L r2 。
As a preferred scheme of the present invention, the present invention provides a method for implementing a symmetric dual-Boost circuit based on soft switching, comprising the following steps:
s1, quantizing the power tube S based on the seven working stages b On-time and off-time of;
s2, quantizing the resonance angular frequency of the symmetrical soft switching topological circuit based on the principle of ensuring the time limit and the stable completion of the resonance loop;
step S3, based on ensuring D 1 And D 2 、D 4 And D 5 The principle of reliable turn-off and loss reduction can be used for quantizing the element parameters in the symmetrical soft switch topological circuit.
As a preferable embodiment of the present invention, in the step S1, the power tube S b The specific method for quantifying the on-time and the off-time comprises the following steps:
analyzing the symmetrical soft switching topology circuit at t 1 ～t 4 Inductance L in phase r1 Capacitor C s1 And a capacitor C r1 In time of energy conversion process and according to said inductance L r1 Capacitor C s1 And a capacitor C r1 Quantizing said power tube S in an energy conversion process b The minimum on-time of (c) is:
T min(on) ＝T·D min ，
in the formula, T min(on) ＞t 4 -t 1 T is the switching period, D min A minimum duty cycle;
analyzing t of the symmetrical soft switching topological circuit in the last switching period 5 Stage to next switching period t 0 Inductance L in phase r1 Capacitor C s1 And a capacitor C r1 Energy conversion process between load resistor R and according to said inductance L r1 Capacitor C s1 And a capacitor C r1 Quantifying the power tube S in the energy conversion process between the load resistor R b The minimum off-time of (a), the minimum off-time being:
T min(off) ＝T·(1-D max )，
in the formula, T min(on) ＞t 0 ′-t 5 T is the switching period, D max The maximum duty cycle.
As a preferred aspect of the present invention, in step S2, a specific method for quantizing the resonant angular frequency of the symmetric soft switching topology circuit includes:
obtaining a switching tube S b And ensuring that the resonance angular frequency of the resonant tank is greater than the switching frequency so that the resonance reaction of the resonant tank is completed within a defined time, the quantitative formula of the resonance angular frequency being:
ω 2 ＞2πf s ；
in the formula (I), the compound is shown in the specification,
C r ＝C r1 ＝C r2 ，L r ＝L r1 ＝L r2 ，ω 2 is the resonant angular frequency, f s Is the switching frequency, C r1 、C r2 Respectively characterized by a capacitance C r1 、C r2 ，L r1 、L r2 Respectively characterized by inductance L r1 、L r2 。
As a preferred aspect of the present invention, in step S3, a specific method for quantizing element parameters in a symmetric soft switching topology circuit includes:
using said capacitor C r1 Or C r2 Diode D before discharge is 0 1 And a diode D 2 Or diode D 4 And a diode D 5 The method can reliably turn off, and an element basis relation of the symmetrical soft switch topological circuit is constructed as follows:
in the formula, C s ＝C s1 ＝C s2 ，L r ＝L r1 ＝L r2 ，C r1 、C r2 Respectively characterized by a capacitance C r1 、C r2 ，L r1 、L r2 Respectively characterized by inductance L r1 、L r2 ，I in For the input current of the power supply E, U o Is the voltage across the load resistor R.
In a preferred embodiment of the present invention, the capacitance C is obtained by using the soft switching element fundamental relational expression and a quantization formula of the resonance angular frequency r Capacitor C s Inductance L r The value range is as follows:
in the formula, C s ＝C s1 ＝C s2 ，L r ＝L r1 ＝L r2 ，C r ＝C r1 ＝C r2 ，
Respectively characterized by a capacitance C r1 、C r2 Voltage U across Cr1 、U Cr2 Maximum value of (1), I in max Input current I for power supply E in Maximum value of (C) r1 、C r2 Respectively characterized by a capacitance C r1 、C r2 ，C s1 、C s2 Respectively characterized by a capacitance C s1 、C s2 ，L r1 、L r2 Respectively characterized by inductance L r1 、L r2 。
Compared with the prior art, the invention has the following beneficial effects:
the invention embeds a symmetrical soft switching topological circuit in a symmetrical double-Boost topological circuit and utilizes a capacitor C in the symmetrical soft switching topological circuit s1 Capacitor C s2 Are respectively responsible for providing power tubes S b Zero current turn-off condition, inductance L r1 An inductor L r2 Is responsible for providing a power tube S b Zero voltage turn-on condition, reducing power transistor S as a whole b While the soft switching circuit also causes the power diode VD 1 、VD 2 Symmetrical double-Boost converter working in zero-current turn-off and zero-voltage turn-on states and having soft switching function and capable of reducing power switching devices S on the whole b And a power two tube VD 1 、VD 2 Loss and improved converter efficiency. The soft switching circuit is applied to a three-phase single-switch Boost rectifier in the hybrid rectifier, so that the switching loss of the hybrid rectifier is reduced, and the energy conversion efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
Fig. 1 is a schematic diagram of a symmetric dual-Boost circuit based on a soft switch according to an embodiment of the present invention;
FIG. 2 is a diagram of a soft switch-based system according to an embodiment of the present invention an equivalent circuit diagram of the symmetrical double Boost circuit in a switching period;
fig. 2 (a) is an equivalent circuit diagram of a symmetric dual-Boost circuit based on a soft switch at a stage t0 to t1 according to an embodiment of the present invention;
fig. 2 (b) is an equivalent circuit diagram of a symmetric dual-Boost circuit based on a soft switch in a stage t1 to t2 according to an embodiment of the present invention;
fig. 2 (c) is an equivalent circuit diagram of a symmetric dual-Boost circuit based on a soft switch in a stage t2 to t3 according to an embodiment of the present invention;
fig. 2 (d) is an equivalent circuit diagram of the symmetric dual-Boost circuit based on the soft switch in the stage t3 to t4 according to the embodiment of the present invention;
fig. 2 (e) is an equivalent circuit diagram of a symmetric dual-Boost circuit based on soft switching at a stage t4 to t5 according to the embodiment of the present invention;
fig. 2 (f) is an equivalent circuit diagram of a symmetric dual-Boost circuit based on a soft switch at a stage t5 to t6 according to an embodiment of the present invention;
fig. 2 (g) is an equivalent circuit diagram of a symmetric dual-Boost circuit based on soft switching at stages t6 to t7 according to the embodiment of the present invention;
fig. 3 is a voltage-current waveform diagram of a symmetric dual-Boost circuit based on a soft switch according to an embodiment of the present invention;
fig. 4 is a flowchart of an implementation method provided in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 4, the present invention provides a soft-switch based symmetric dual-Boost circuit, which includes a symmetric soft-switch topology circuit and a symmetric dual-Boost topology circuit, wherein the symmetric dual-Boost topology circuit includes two symmetric same type Boost basic topology circuits, the two Boost basic topology circuits are symmetrically connected to implement a DC-DC rectification of a medium power and a high power, the symmetric soft-switch topology structure includes two symmetric soft-switch topology structures, the two soft-switch topology structures are respectively and correspondingly embedded in the two Boost basic topology circuits, and the two soft-switch topology structures respectively implement a zero-voltage turn-on and a zero-current turn-off of a power transistor and a power diode in the two Boost basic topology circuits to reduce a power loss of the two Boost basic topology circuits and improve a rectification conversion efficiency of the two Boost basic topology circuits.
The symmetrical double-Boost topological circuit comprises a power supply E and a power tube S b Inductance L 1, Inductance L 2 Power diode VD 1 Power diode VD 2 Capacitance C 1 Capacitor C 2 A load resistor R, an inductor L1, and an inductor L 2 Equal, power diode VD 1 And a power diode VD 2 And are equal to each other, wherein,
positive pole and inductance L of power supply E 1 Is electrically connected with an inductor L 1 The other end of the first and second electrodes are respectively connected with a power tube S b Second pin of (1), power diode VD 1 Is electrically connected with a power diode VD 1 The other end of each of the first and second capacitors is connected to a capacitor C 1 One end of the load resistor R, the negative electrode of the power supply E and the inductor L 2 Is electrically connected with an inductor L 2 The other end of the first and second electrodes are respectively connected with a power tube S b Third pin, power diode VD 2 Is electrically connected with a power diode VD 2 The other end of each of the first and second capacitors is connected to a capacitor C 2 One end of the load resistor R, the other end of the load resistor R, and a capacitor C 1 Another terminal of (1) and a capacitor C 2 The other end of the first and second electrodes is electrically connected.
The symmetrical soft switching topology circuit comprises an inductor L r1 Inductance L r2 Capacitance C s1 Capacitor C s2 Capacitor C r1 Capacitor C r2 Diode D 1 Diode D 2 Diode D 3 Diode D 4 Diode D 5 Diode D 6 Inductance L r1 And an inductance L r2 Equal, capacitance C s1 And a capacitor C s2 Equal, capacitance C r1 And a capacitor C r2 Equal, diode D 1 And a diode D 4 Equal, diode D 2 And a diode D 5 Equal, diode D 3 And a diode D 6 Equal, capacitance C s1 Capacitor C s2 Is a power tube S b Providing a zero current turn-off condition, inductor L r1 An inductor L r2 Is a power tubeS b Providing a zero-voltage switching-on condition, wherein the two soft switch topological structures are power diodes VD 1 、VD 2 Providing a zero current off condition and a zero voltage on condition, wherein,
inductor L r1 One terminal of (1), diode D 1 One end of each of which is connected with the power tube S b The second pin of the inductor L is electrically connected with the first pin of the inductor r1 The other end of (2) and a power diode VD 1 Is electrically connected with a diode D 1 The other end of the diode D is respectively connected with the diode D 2 One terminal of (1), a capacitor C s1 One end of the capacitor C is electrically connected with s1 Another terminal of (1) and a capacitor C 1 Is electrically connected with the other end of the diode D 2 The other end of each of the first and second capacitors is connected to a capacitor C r1 One terminal of (1), diode D 3 One end of the capacitor C is electrically connected with r1 Another end of (1) and an inductor L r1 Is electrically connected with the other end of the diode D 3 The other end of (2) and a power diode VD 1 The other end of the first and second electrodes is electrically connected;
inductor L r2 One end of (1), the second diode D 4 Respectively connected with the power tube S 2 Pin of the inductor L is electrically connected with the pin of the inductor r2 The other end of (2) and a power diode VD 2 Is electrically connected to the second diode D 4 The other end of the diode D is respectively connected with the diode D 5 One terminal of (1), a capacitor C s2 One end of the capacitor C is electrically connected with s2 Another terminal of (1) and a capacitor C 2 Is electrically connected with the other end of the diode D 5 The other end of each of the first and second capacitors is connected to a capacitor C r2 One terminal of (1), diode D 6 One end of the capacitor C is electrically connected with r2 Another end of (2) and an inductor L r2 Is electrically connected with the other end of the diode D 6 The other end of (2) and a power diode VD 2 The other end of the first and second electrodes is electrically connected.
The switching period of the symmetrical soft switching topological circuit comprises seven working stages, the seven working stages are respectively analyzed in detail, and in the analysis process, all devices in the circuit are assumed to be ideal devices, C s1 <C r1 ，C s2 <C r2 The working process of the symmetrical soft switching topological circuit in one switching period is shown in figure 2, and the Boost soft switchThe voltage and current waveforms of the circuit are shown in fig. 3, so that the electrical parameter data and the energy conversion process of the elements in one switching period of the soft switching circuit can be analyzed and obtained, wherein,
t of the first operating phase comprising a switching cycle 0 ～t 1 Stage (2): an equivalent circuit diagram of the soft switching circuit in the Boost basic topology circuit is shown in fig. 2 (a), and at t 0 ～t 1 Within a moment, the switch tube S b Kept in an off state, power diode VD 1 Power diode VD 2 Keeping a zero voltage conduction state;
t of the second operating phase comprising a switching cycle 1 ～t 2 Stage (2): an equivalent circuit diagram of the symmetrical soft switching circuit in the Boost basic topology circuit is shown in fig. 2 (b), and a power tube S b A power diode VD is changed from an off state to a zero current conducting state 1 Power diode VD 2 A zero-voltage on state is changed into a zero-current off state, and a capacitor C r1 Capacitor C r2 Maintained in a fully discharged state;
t of the third operating phase comprising a switching cycle 2 ～t 3 And in the stage, an equivalent circuit diagram of the symmetrical soft switching circuit working and running in the Boost basic topology circuit is shown in fig. 2 (c), and a power tube S b Remaining in a conducting state, the power diode VD 1 Power diode VD 2 Maintained in an off state, inductor L r1 Capacitor C r1 Capacitor C r2 An inductor L r2 Held in series resonance, capacitor C s1 Capacitor C s2 Remaining in a discharged state, capacitor C r1 Capacitor C r2 Remaining in a charged state;
t of the fourth operating phase comprising a switching cycle 3 ～t 4 And in the stage, an equivalent circuit diagram of the symmetrical soft switching circuit working and running in the Boost basic topology circuit is shown in fig. 2 (d), and a power tube S b Remaining in a conducting state, the power diode VD 1 Power diode VD 2 Remaining in the off state, diode D 1 And a diode D 4 Maintained in a conducting state, inductor L r1 And a capacitor C r1 Maintained in series resonance, capacitor C r2 And an inductance L r2 Held in series resonance, capacitor C s1 Capacitor C s2 Remaining in a fully discharged state, capacitor C r1 Capacitor C r2 Remaining in a charged state;
t of the fifth operating phase comprising a switching cycle 4 ～t 5 And in the stage, an equivalent circuit diagram of the symmetrical soft switching circuit working and running in the Boost basic topology circuit is shown in fig. 2 (e), and a power tube S b Remaining in a conducting state, the power diode VD 1 Power diode VD 2 Remaining in the off state, diode D 1 Diode D 2 And a diode D 4 Diode D 5 Remaining in an off state, capacitor C r1 Capacitor C r2 Remaining in a full state;
t of the sixth operating phase comprising a switching cycle 5 ～t 6 And in the stage, an equivalent circuit diagram of the symmetrical soft switching circuit working and running in the Boost basic topology circuit is shown in fig. 2 (f), and a power tube S b A power diode VD for switching from on state to off state with zero current 1 Power diode VD 2 Remaining in the off state, diode D 1 Diode D 3 And a diode D 4 Diode D 6 Held in a conducting state, capacitor C s1 And a capacitor C s2 Held in a charged state, capacitor C r1 、C r2 Remain in a discharged state;
t of the seventh operating phase comprising a switching cycle 6 ～t 7 And in the stage, an equivalent circuit diagram of the symmetrical soft switching circuit working and running in the Boost basic topology circuit is shown in fig. 2 (g), and a power tube S b Remaining in the off state, the power diode VD 1 Power diode VD 2 Remaining in the off state, diode D 3 And a diode D 6 Held in a conducting state, capacitor C s1 And a capacitor C s2 Remaining in a full state, capacitor C r1 Capacitor C r2 Is maintained in a discharged state.
Specifically, as shown in FIG. 2 (a), t 0 ～t 1 Stage (2): switch tube S 1 Remains in the off state, t 0 Time of day, C r1 、C r2 The discharge process is finished and the voltage U at both ends Cr1 、U Cr2 When the voltage is equal to zero, the power diodes VD1 and VD2 are conducted at the moment and are conducted in a zero voltage state. C in series s1 、C s2 Terminal voltage approximation and load voltage U O And L is r1 、L r2 Current I of Lr Is equal to the input current I L ＝I in 。
As shown in FIG. 2 (b), t 1 ～t 2 Stage (2): t is t 1 Time-triggered pulse signal, power switch tube S b The switch tube is switched to a conducting state, and the current I is increased due to the addition of the conducting branch of the switch tube Lr1 、I Lr2 The linear decrease is started, the current of the branch circuit of the switching tube is slowly increased, the voltage is reduced to zero at the moment of the conduction of the power device, and at the moment, the conduction current is very small and is conducted at the voltage of zero basically. With the power device fully turned on, the branch current gradually increases, I Lr1 、I Lr2 The current is gradually reduced until t 2 Time of day current I Lr1 、I Lr2 Is reduced to zero, and the power diode VD 1 、VD 2 Is turned off for zero current. The expression for this time is:
in the formula, L r ＝L r1 ＝L r2 。
As shown in FIG. 2 (c), t 2 ～t 3 Stage t 2 At that moment, due to the power diode VD 1 、VD 2 The current is zero, and the load is output by an output filter capacitor C 1 And C 2 Providing electrical energy. In I Lr1 While the current is reduced to zero, the symmetrical capacitor C s1 、C s2 Voltage of starts to pass through D 2 、C r1 、L r1 、S 1 And a symmetrical circuit D 5 、C r12 、L r2 The formed loop discharges, and the capacitor and the inductor connected in series in the loop resonate.In this process C r1 、C r2 Start of charging, U Cr1 、U Cr2 Rising from zero, L r1 、L r2 Increases in the opposite direction from zero. When t is reached 3 At the time of day, C s1 、C s2 The electric energy on the U is completely released, and at the moment, the U is Cs1 ＝U Cs2 ＝0。C s1 The duration of the discharge process is expressed as:
wherein the content of the first and second substances,
C s ＝C s1 ＝C s2 ，C r ＝C r1 ＝C r2 。
as shown in FIG. 2 (d), t 3 ～t 4 Stage t 3 At that time, because the capacitor voltage U is now Cs1 ＝0，U Cs2 =0, so that the diode D 1 And D 4 Conducting to form resonant loops in the symmetrical Boost circuits respectively, as shown in (d), L r1 And C r1 Form a resonant circuit therebetween, and L r2 And C r2 A resonant circuit is formed between the two. Inductive current I Lr1 By D 1 、D 2 To C r1 Charging, U Cr1 Continues to rise to t 4 Time I Lr1 Reducing to zero, releasing the electric energy of the inductor, and then U Cr1 Then reaches the maximum value U Cr1max . The other resonance mode is the same. The duration of this process and the resonant period of the inductance and capacitance are equal, the corresponding expression is as follows:
in the formula, L r ＝L r1 ＝L r2 ，C r ＝C r1 ＝C r2 。
As shown in the figure2 (e) is shown, t 4 ～t 5 Stage two resonant circuits of the previous period of time at t 4 Time of day, U Cr1 、U Cr2 Voltage reaches resonance peak, C r1 、C r2 Voltage across capacitor D 1 、D 2 And D 4 、D 5 Is turned off and U Cr1 、U Cr2 Is kept at a maximum value U Cr1max . At this time, the switch tube S b At the stage of stable conduction, the inductor L 1 、L 2 Current of I in ＝I L 。I L For flowing through the inductance L 1 、L 2 The current of (2).
As shown in FIG. 2 (f), t 5 ～t 6 Stage at t 5 At any moment, send out a switch tube S b Shut down pulse command when power supply passes L 1 、D 1 And in symmetrical circuit D 4 、L 2 To C s1 And C s2 Starting to charge, the switch tube S b Voltage U connected in series across Cs1 、U Cs2 Increasing gradually from zero, power switch S b And the voltage at the two ends is gradually increased in the turn-off process, so that the reduction of the calculation loss of the switch is facilitated. At the same time, the power supply also passes through L 1 、L r1 、C r1 、D 3 And its symmetrical circuit D 6 、C r2 、L r2 、L 2 A loop is formed to supply power to the load and charge the output filter capacitor; at this time C r1 、C r2 Are respectively in a discharge state, U Cr1 、U Cr2 Gradually decrease, I L ＝I in ＝I Lr +I Cs (I Cs Is Cs 1 、Cs 2 Charging current). At t 6 Time of day, C s1 、C s2 Capacitor voltage U Cs1 、U Cs2 Respectively reach a maximum value, U Cs1max ≈U o 。
As shown in FIG. 2 (g), t 6 ～t 7 Stage at t 6 At the moment, the inductor current I Lr ＝I L ＝I in ，C r1 、C r2 Voltage U across Cr1 、U Cr2 Powered diode VD 1 、VD 2 And (4) clamping. Power supplyStill pass through L 1 、L r1 、C r1 、D 3 And its symmetrical circuit D 6 、C r2 、L r2 、L 2 Form a loop to supply electric energy to the load side, and C r1 、C r2 Not yet fully discharged. Up to t 7 Time of day, C r1 、C r2 Complete discharge, U Cr1 、U Cr2 Down to zero, i.e. back to t 0 An initial state.
By the above analysis: when switching tube S b When it is turned on, I is not suddenly changed because the inductor current L ＝I Lr1 ＝I in ，S b The voltage at the two ends is rapidly reduced, and the current is slowly increased, so that the realization condition of zero-voltage switching-on is ensured, and the switching-on loss is reduced; when switching tube S b When closed, due to C s1 、C s2 To S b With clamping effect, make S b The voltage needs to be increased slowly. The reason is that the capacitor voltage cannot be suddenly changed due to the property of the capacitor, and compared with the voltage, the current reduction speed is higher, so that the realization condition of zero current turn-off is ensured, and the turn-off loss is reduced.
It can also be seen from FIG. 3 that when t is 1 Time first power tube S 1 At turn-on, voltage U s1 Rapidly drops to zero and the current I s1 The voltage and the current are slowly increased from zero, so that the loss caused by the simultaneous existence of the voltage and the current is avoided; at t 5 At the moment, the trigger signal disappears, and the first power tube S 1 When turned off, the current I s1 Drops rapidly until its value equals zero, at the same time as the voltage U s1 The slow rise is started, unnecessary loss is avoided in the process, and similarly, when t is reached 1 Time second power tube S 2 At turn-on, voltage U s2 Rapidly drops to zero and the current I s2 The voltage and the current are slowly increased from zero, so that the loss caused by the simultaneous existence of the voltage and the current is avoided; at t 5 At the moment, the trigger signal disappears, when t 1 Time second power tube S 2 When turned off, the current I s2 Drops rapidly until its value equals zero, at the same time as the voltage U s2 Begins to rise slowly, during which processUnnecessary losses are also avoided.
The duration of the second, third and fourth working phases of the seven working phases is determined by the electrical components, and the mathematical expressions of the duration of the second, third and fourth working phases are respectively:
in the second working phase t 1 ～t 2 The duration of the phase is t 1～2 ，t 1～2 The quantization expression of (a) is:
in the formula, L r ＝L r1 ＝L r2 ，L r1 、L r2 Respectively characterized by inductance L r1 、L r2 ，I in For the input current of the power supply E, U o Is the voltage across the load resistor R;
in the working phase t 2 ～t 3 The duration of the phase is t 2～3 ，t 2～3 The quantization expression of (a) is:
in the formula (I), the compound is shown in the specification,
C r ＝C r1 ＝C r2 ，C s ＝C s1 ＝C s2 ，L r ＝L r1 ＝L r2 ，C r1 、C r2 respectively characterized by a capacitance C r1 、C r2 ，C s1 、C s2 Respectively characterized by a capacitance C s1 、C s2 ，L r1 、L r2 Are respectively characterized by inductance L r1 、L r2 ；
In the working phase t 3 ～t 4 The duration of the phase is t 3～4 ，t 3～4 The quantization expression of (a) is:
in the formula, C r ＝C r1 ＝C r2 ，L r ＝L r1 ＝L r2 C r1 、C r2 Respectively characterized by a capacitance C r1 、C r2 ，L r1 、L r2 Respectively characterized by inductance L r1 、L r2 。
The design principle of the symmetrical soft switching circuit is that the design principle of the symmetrical soft switching circuit does not influence the work of the original circuit on the premise of realizing zero current turn-off and zero voltage turn-on of the soft switching circuit. Wherein the inductance L r1 、L r2 The rise time of the turn-on current can be influenced if L r1 、L r2 Too large increases the loss of the circuit, so L r1 、L r2 Should be reduced appropriately; but L r1 、L r2 The smaller the rise time, the shorter the rise time, eventually making it difficult to realize the power transistor S b Zero current of (1) is on, thus L r1 、L r2 Nor too small. Additional capacitance C s1 、C s2 The rise time of the turn-off voltage is influenced, so the invention provides a realization method of a symmetrical double-Boost circuit based on soft switching, and provides a configuration process of parameters of inductance and capacitance elements, which is specifically as follows.
As shown in fig. 4, based on the schematic diagram of the symmetric dual-Boost circuit based on the soft switch, the invention provides an implementation method, which includes the following steps:
step S1, quantizing a power tube S based on seven working stages b On-time and off-time of;
s2, quantizing the resonance angular frequency of the symmetrical soft switch topological circuit based on the principle of ensuring the time limit and stable completion of the resonance loop;
step S3, based on ensuring D 1 And D 2 Principle quantification symmetric soft switch capable of reliably switching off and reducing lossAnd (4) regarding element parameters in the topological circuit.
In step S1, a power tube S b The specific method for quantifying the on-time and the off-time comprises the following steps:
analyzing the symmetrical soft switching topology circuit at t 1 ～t 4 In-phase inductance L r1 Capacitor C s1 And a capacitor C r1 Energy conversion process between, and according to inductance L r1 Capacitor C s1 And a capacitor C r1 Quantizing power tube S in the course of energy conversion b The minimum on-time of (d) is:
T min(on) ＝T·D min ，
in the formula, T min(on) ＞t 4 -t 1 T is the switching period, D min A minimum duty cycle;
analyzing t of symmetrical soft switch topological circuit in last switch period 5 Stage to next switching period t 0 In-phase inductance L r1 Capacitor C s1 And a capacitor C r1 Energy conversion process between load resistor R and inductor L r1 Capacitor C s1 And a capacitor C r1 Energy conversion process quantization power tube S between load resistor R b The minimum off-time of (c) is:
T min(off) ＝T·(1-D max )，
in the formula, T min(on) ＞t 0 ′-t 5 T is the switching period, D max The maximum duty cycle.
In step S2, the specific method for quantizing the resonant angular frequency of the symmetric soft-switching topology circuit includes:
obtaining a switching tube S b And ensuring that the resonance angular frequency of the resonant tank is greater than the switching frequency so that the resonance reaction of the resonant tank is completed within a defined time, the quantitative formula of the resonance angular frequency being:
ω 2 ＞2πf s ；
in the formula (I), the compound is shown in the specification,
C r ＝C r1 ＝C r2 ，L r ＝L r1 ＝L r2 ，ω 2 is the resonant angular frequency, f s Is the switching frequency, C r1 、C r2 Respectively characterized by a capacitance C r1 、C r2 ，L r1 、L r2 Respectively characterized by inductance L r1 、L r2 。
In step S3, the specific method for quantizing the element parameters in the symmetric soft-switching topology circuit includes:
by means of a capacitor C r1 Or C r2 Diode D before discharge is 0 1 And a diode D 2 Or diode D 4 And a diode D 5 The method can reliably turn off, and an element basis relation of the symmetrical soft switch topological circuit is constructed as follows:
in the formula, C s ＝C s1 ＝C s2 ，L r ＝L r1 ＝L r2 ，C r1 、C r2 Respectively characterized by a capacitance C r1 、C r2 ，L r1 、L r2 Respectively characterized by inductance L r1 、L r2 ，I in For the input current of the power supply E, U o Is the voltage across the load resistor R.
The capacitance C is obtained by using the basic relational expression of the soft switching element and the quantization formula of the resonance angular frequency r Capacitor C s Inductance L r The value range is as follows:
in the formula, C s ＝C s1 ＝C s2 ，L r ＝L r1 ＝L r2 ，C r ＝C r1 ＝C r2 ，
Respectively characterized by a capacitance C r1 、C r2 Voltage U across Cr1 、U Cr2 Maximum value of (1), I in max Input current I for power supply E in Maximum value of (C) r1 、C r2 Respectively characterized by a capacitance C r1 、C r2 ，C s1 、C s2 Respectively characterized by a capacitance C s1 、C s2 ，L r1 、L r2 Respectively characterized by inductance L r1 、L r2 。
In particular, if the element basis relation does not hold, diode D 1 Diode D 2 And a diode D 3 Will and power diode VD 1 Simultaneously conduct until L r1 All input currents can be taken up again. This should be avoided, which would otherwise lead to an increased switching loss of the diode and thus to unnecessary energy waste.
Solving the capacitance C by using element basis relational expression and quantitative formula of resonance angular frequency r Capacitance C s Inductance L r Specifically, the method comprises the following steps:
transforming the element basis relation to obtain
Due to the fact that
Then
By using
Due to the fact that in ＜I in max Then, then
The following can be obtained:
by using
Due to the fact that in ＜I in max Then, then
The following can be obtained:
wherein, the symmetric soft switch topology circuit has symmetry type, so it can be directly connected with C s ＝C s1 ＝C s2 ，L r ＝L r1 ＝L r2 ，C r ＝C r1 ＝C r2 Determining the capacitance C r1 Capacitor C s1 Inductance L r1 Equivalent to obtain a capacitance C r2 Capacitor C s2 Inductance L r2 。
The symmetrical double-Boost topological circuit is developed by a three-phase single-switch Boost rectifier connected in parallel in a hybrid rectifier, the structure comprises two Boost basic circuits of the same type, and the circuit structure can be applied to medium and high power occasions.
The invention is in symmetryA symmetrical soft switching topological circuit is arranged in the symmetrical double-Boost topological circuit, and the symmetrical double-Boost topological circuit is provided with an L 1 ＝L 2 ，VD 1 ＝VD 2 The symmetrical soft switching topology circuit has C 1 ＝C 2 ，C s1 ＝C s2 ，L r1 ＝L r2 ，D 1 ＝D 4 ，D 2 ＝D 5 ，D 3 ＝D 6 Using capacitors C in symmetrical soft switching topology s1 Capacitor C s2 Are respectively responsible for providing power tubes S b Zero current turn-off condition, inductance L r1 Inductor L r2 Is responsible for providing a power tube S b Zero voltage turn-on condition, reducing power transistor S as a whole b While the soft switching circuit also causes the power diode VD 1 、VD 2 Symmetrical double-Boost converter working in zero-current turn-off and zero-voltage turn-on states and having soft switching function and capable of reducing power switching devices S on the whole b And a power two tube VD 1 、VD 2 Loss and converter efficiency are improved. The soft switching circuit is applied to a three-phase single-switch Boost rectifier in a hybrid rectifier, so that the switching loss of the hybrid rectifier is reduced, and the energy conversion efficiency is improved.
The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Various modifications and equivalents may be made to the disclosure by those skilled in the art within the spirit and scope of the disclosure, and such modifications and equivalents should also be considered as falling within the scope of the disclosure.
Claims (6)
1. The utility model provides a two Boost circuits of symmetry type based on soft switch which characterized in that: the double-soft-switch topological circuit comprises a symmetrical soft-switch topological circuit and a symmetrical double-Boost topological circuit, wherein the symmetrical double-Boost topological circuit comprises two Boost basic topological circuits of the same type which are symmetrical, the two Boost basic topological circuits are symmetrically connected to realize medium-high power DC-DC rectification, the symmetrical soft-switch topological circuit comprises two symmetrical soft-switch topological structures, and the two soft-switch topological structures are respectively correspondingly arranged in the two soft-switch topological circuitsIn the two Boost basic topology circuits, the two soft switch topology structures respectively realize zero-voltage switching-on and zero-current switching-off of power tubes and power diodes in the two Boost basic topology circuits so as to reduce power loss of the two Boost basic topology circuits and improve rectification conversion efficiency of the two Boost basic topology circuits; the symmetrical double-Boost topological circuit comprises a power supply E and a power tube S b Inductance L 1 Inductance L 2 Power diode VD 1 Power diode VD 2 Capacitor C 1 Capacitor C 2 Load resistance R, said inductance L 1 And the inductance L 2 Equal, the power diode VD 1 And the power diode VD 2 And wherein, in the case of the same,
the positive pole of the power supply E and the inductor L 1 One end of the inductor L is electrically connected with the inductor 1 Is connected with the power tube S at the other end respectively b Second pin of (1), the power diode VD 1 Is electrically connected with the power diode VD 1 Is connected to the capacitor C 1 One end of the load resistor R, the negative electrode of the power supply E and the inductor L 2 One end of the inductor L is electrically connected with the inductor 2 Is connected with the power tube S at the other end respectively b Third pin of (2) and the power diode VD 2 Is electrically connected with the power diode VD 2 Is connected to the capacitor C 2 One end of the capacitor C is electrically connected with the other end of the load resistor R 1 And the other end of the capacitor C 2 The other end of the first and second connecting wires is electrically connected; the symmetrical soft switching topology circuit comprises an inductor L r1 Inductance L r2 Capacitor C s1 Capacitor C s2 Capacitor C r1 Capacitor C r2 Diode D 1 Diode D 2 Diode D 3 Diode D 4 Diode D 5 Diode D 6 Said inductance L r1 And the inductance L r2 Equal, the capacitance C s1 And said capacitor C s2 Equal, the capacitance C r1 And the capacitorC r2 Equal, the diode D 1 And the diode D 4 Equal, the diode D 2 And the diode D 5 Equal, the diode D 3 And the diode D 6 Equal, the capacitance C s1 Capacitor C s2 Is the power tube S b Providing a zero current turn-off condition, said inductance L r1 Inductor L r2 Is the power tube S b Providing a zero-voltage switching-on condition, wherein the two soft switch topological structures are power diodes VD 1 、VD 2 Providing a zero current off condition and a zero voltage on condition, wherein,
the inductance L r1 One end of (1), diode D 1 One end of each of the first and second power transistors S b The second pin of the inductor L is electrically connected with the first pin of the inductor r1 And the other end of the power diode VD 1 Is electrically connected with the diode D 1 And the other end of the diode D is respectively connected with the diode D 2 One terminal of (1), a capacitor C s1 One end of the capacitor C is electrically connected with the first end of the capacitor s1 And the other end of the capacitor C 1 The other end of the diode D is electrically connected with the diode 2 Is connected to the capacitor C r1 One terminal of (1), diode D 3 One end of the capacitor C is electrically connected with the first end of the capacitor r1 And the other end of (1) and the inductance L r1 The other end of the diode D is electrically connected with the diode 3 And the other end of said power diode VD 1 The other end of the first and second electrodes is electrically connected;
the inductance L r2 One end of (1), the second diode D 4 One end of each of the first and second power transistors S b The third pin of the inductor L is electrically connected with the first pin of the inductor r2 And the other end of the power diode VD 2 Is electrically connected with the first diode D 4 And the other end of the diode D is respectively connected with the diode D 5 One terminal of (1), a capacitor C s2 One end of the capacitor C is electrically connected with the first end of the capacitor s2 And the other end of the capacitor C 2 The other end of the diode D is electrically connected with the diode 5 Is connected to the capacitor C r2 One terminal of (1), diode D 6 Is electrically connected with the capacitorC r2 And the other end of (1) and the inductance L r2 The other end of the diode D is electrically connected with the diode 6 And the other end of the power diode VD 2 The other end of the first and second electrodes is electrically connected; the switching cycle of the symmetric soft-switching topology includes seven operating phases, wherein,
t of the first operating phase comprising a switching cycle 0 ～t 1 Stage (2): at said t 0 ～t 1 At a moment, the power tube S b The power diode VD1 and the power diode VD2 are kept in a zero-voltage conducting state;
t of the second operating phase comprising a switching cycle 1 ～t 2 Stage, the power tube S b Changing from an off state to a zero current conducting state, the power diode VD 1 Power diode VD 2 The zero voltage on state is changed into a zero current off state, and the capacitor C r1 Capacitor C r2 Remain in a fully discharged state;
t of the third operating phase comprising a switching cycle 2 ～t 3 Stage, the power tube S b Is maintained in a conducting state, the power diode VD 1 Is maintained in an off state, the inductance L r1 Capacitor C r1 Capacitor C r2 Inductor L r2 Is maintained in series resonance state, and the capacitor C s1 Capacitor C s2 Is maintained in a discharged state, the capacitor C r1 Capacitor C r2 Remaining in a charged state;
t of the fourth operating phase comprising a switching cycle 3 ～t 4 Stage, the power tube S b Is maintained in a conducting state, the power diode VD 1 Power diode VD 2 Remaining in an off state, the diode D 1 And a diode D 4 Is maintained in a conducting state, the inductance L r1 And a capacitor C r1 Is maintained in series resonance state, and the capacitor C r2 And an inductance L r2 Is maintained in series resonance state, and the capacitance C s1 Capacitor C s2 Is maintained in a fully discharged state, soThe capacitor C r1 Capacitor C r2 Remaining in a charged state;
t of the fifth operating phase comprising a switching cycle 4 ～t 5 Stage, the power tube S b Is maintained in a conducting state, the power diode VD 1 Power diode VD 2 Remaining in the off state, the diode D 1 Diode D 2 And a diode D 4 Diode D 5 Is maintained in an off state, the capacitor C r1 Capacitor C r2 Remaining in a full state;
t of the sixth operating phase comprising a switching cycle 5 ～t 6 Stage, the power tube S b The power diode VD is changed from a conducting state to a zero-current turn-off state 1 Power diode VD 2 Remaining in the off state, the diode D 1 Diode D 3 And a diode D 4 Diode D 6 Is maintained in a conducting state, the capacitor C s1 And a capacitor C s2 Is maintained in a charged state, the capacitor C r1 、C r2 Maintaining the discharge state;
t of the seventh operating phase comprising a switching cycle 6 ～t 7 Stage, the power tube S b Kept in an off state, the power diode VD 1 Power diode VD 2 Remaining in an off state, the diode D 3 And a diode D 6 Is maintained in a conducting state, and the capacitor C s1 And a capacitor C s2 Remaining in a full state, said capacitance C r1 Capacitor C r2 Maintaining the discharge state; the duration of the second, third and fourth working phases of the seven working phases is determined by the electrical components, and the mathematical expressions of the duration of the second, third and fourth working phases are respectively:
t in the second working phase 1 ～t 2 The duration of the phase being t 1～2 Said t is 1～2 The quantization expression of (a) is:
in the formula, L r ＝L r1 ＝L r2 ，L r1 、L r2 Respectively characterized by inductance L r1 、L r2 ，I in For the input current of the power supply E, U o Is the voltage across the load resistor R;
t in the working phase 2 ～t 3 The duration of the phase is t 2～3 Said t is 2～3 The quantization expression of (a) is:
in the formula (I), the compound is shown in the specification,
C r ＝C r1 ＝C r2 ，C s ＝C s1 ＝C s2 ，L r ＝L r1 ＝L r2 ，C r1 、C r2 respectively characterized by a capacitance C r1 、C r2 ，C s1 、C s2 Respectively characterized by a capacitance C s1 、C s2 ，L r1 、L r2 Are respectively characterized by inductance L r1 、L r2 ；
T in the working phase 3 ～t 4 The duration of the phase is t 3～4 Said t is 3～4 The quantization expression of (a) is:
in the formula, C r ＝C r1 ＝C r2 ，L r ＝L r1 ＝L r2 ，C r1 、C r2 Respectively characterized by a capacitance C r1 、C r2 ，L r1 、L r2 Respectively characterized by inductance L r1 、L r2 。
2. A method for implementing a soft-switching based symmetric dual Boost circuit according to claim 1, wherein: the method comprises the following steps:
s1, quantizing the power tube S based on the seven working stages b On-time and off-time of;
s2, quantizing the resonance angular frequency of the symmetrical soft switching topology circuit based on the principle of ensuring the time limit and stable completion of a resonance loop;
step S3, based on ensuring D 1 And D 2 、D 4 And D 5 The principle of reliable turn-off and loss reduction can be used for quantizing the element parameters in the symmetrical soft switch topological circuit.
3. The method of claim 2, wherein in step S1, the power tube S b The specific method for quantifying the on-time and the off-time comprises the following steps:
analyzing the symmetric soft switching topology circuit at t 1 ～t 4 In-phase inductance L r1 Capacitor C s1 And a capacitor C r1 In time of energy conversion process and according to said inductance L r1 Capacitor C s1 And a capacitor C r1 Quantizing the power tube S in the course of energy conversion b The minimum on-time of (c) is:
T min(on) ＝T·D min ，
in the formula, T min(on) >t 4 -t 1 T is the switching period, D min A minimum duty cycle;
analyzing t of the symmetrical soft switching topological circuit in the last switching period 5 Phase to next switching period t 0 Inductance L in phase r1 Capacitor C s1 And a capacitor C r1 Energy conversion process between load resistance R and according to said inductance L r1 Capacitor C s1 And a capacitor C r1 Load resistance RQuantizing the power tube S in the course of energy conversion b The minimum off-time of (a), the minimum off-time being:
T min(off) ＝T·(1-D max )，
in the formula, T min(off) >t 0 ′-t 5 T is the switching period, D max The maximum duty cycle.
4. The method according to claim 3, wherein in step S2, the specific method for quantizing the resonant angular frequency of the symmetric soft switching topology circuit includes:
obtaining a power tube S b And ensuring that the resonance angular frequency of the resonant tank is greater than the switching frequency so that the resonance reaction of the resonant tank is completed within a defined time, wherein the quantization formula of the resonance angular frequency is as follows:
ω 2 >2πf s ；
in the formula (I), the compound is shown in the specification,
C r ＝C r1 ＝C r2 ，L r ＝L r1 ＝L r2 ，ω 2 is the resonant angular frequency, f s Is the switching frequency, C r1 、C r2 Respectively characterized by a capacitance C r1 、C r2 ，L r1 、L r2 Respectively characterized by inductance L r1 、L r2 。
5. The method according to claim 4, wherein in step S3, the specific method for quantizing the parameters of the elements in the symmetric soft-switching topology circuit includes:
by means of said capacitor C r1 Or C r2 Diode D before discharge is 0 1 And a diode D 2 Or diode D 4 And a diode D 5 The method can reliably turn off, and an element basis relation of the symmetrical soft switch topological circuit is constructed as follows:
in the formula, C s ＝C s1 ＝C s2 ，L r ＝L r1 ＝L r2 ，C r1 、C r2 Respectively characterized by a capacitance C r1 、C r2 ，L r1 、L r2 Respectively characterized by inductance L r1 、L r2 ，I in For the input current of the power supply E, U o Is the voltage across the load resistor R, I r Representing the inductor current.
6. The method according to claim 5, wherein the capacitance C is obtained by using the soft switching element basis relation and the quantization formula of the resonance angular frequency r Capacitance C s Inductance L r The value range is as follows:
in the formula, C s ＝C s1 ＝C s2 ，L r ＝L r1 ＝L r2 ，C r ＝C r1 ＝C r2 ，
Respectively characterized by a capacitance C r1 、C r2 Voltage U across Cr1 、U Cr2 Maximum value of (a), I in max Input current I for power supply E in Maximum value of (C) r1 、C r2 Respectively characterized by a capacitance C r1 、C r2 ，C s1 、C s2 Respectively characterized by a capacitance C s1 、C s2 ，L r1 、L r2 Respectively characterized by inductance L r1 、L r2 。
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