CN105896977B - A kind of Sofe Switch of crisscross parallel type DC-DC converter - Google Patents
A kind of Sofe Switch of crisscross parallel type DC-DC converter Download PDFInfo
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- CN105896977B CN105896977B CN201610213077.6A CN201610213077A CN105896977B CN 105896977 B CN105896977 B CN 105896977B CN 201610213077 A CN201610213077 A CN 201610213077A CN 105896977 B CN105896977 B CN 105896977B
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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
- H02M3/158—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 including plural semiconductor devices as final control devices for a single load
- H02M3/1584—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 including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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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
- H02M3/158—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 including plural semiconductor devices as final control devices for a single load
- H02M3/1584—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 including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
- H02M3/1586—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 including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel switched with a phase shift, i.e. interleaved
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
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Abstract
一种交错并联型DC‑DC变换器的软开关，涉及DC‑DC变换器。设有电源、输出电容、功率开关管、续流二极管、吸收电容、箝位电容、辅助开关、谐振电感、谐振电容、开关电容、输出二极管、第一耦合电感和第二耦合电感；第一耦合电感和第二耦合电感为三绕组耦合电感，三绕组耦合电感包含一个原边绕组和第一副边绕组和第二副边绕组。实现功率开关管的零电压导通和零电压关断，具备自动均流能力，利用两个三绕组耦合电感的漏感控制二极管中电流下降速率，解决二极管在关断时的反向恢复问题。利用三绕组耦合电感的第二、三绕组实现变换器的高增益输出，利用两个开关电容拓展变换器的电压输出，降低功率器件的电压应力，功率损耗小，结构简洁。
A soft switch of an interleaved parallel DC-DC converter relates to a DC-DC converter. It is equipped with power supply, output capacitor, power switch tube, freewheeling diode, absorbing capacitor, clamping capacitor, auxiliary switch, resonant inductor, resonant capacitor, switched capacitor, output diode, first coupling inductor and second coupling inductor; the first coupling The inductor and the second coupled inductor are three-winding coupled inductors, and the three-winding coupled inductor includes a primary winding, a first secondary winding, and a second secondary winding. Realize the zero-voltage turn-on and zero-voltage turn-off of the power switch tube, with automatic current sharing capability, use the leakage inductance of two three-winding coupled inductors to control the current drop rate in the diode, and solve the reverse recovery problem of the diode when it is turned off. The second and third windings of the three-winding coupled inductor are used to realize the high-gain output of the converter, and two switched capacitors are used to expand the voltage output of the converter, reducing the voltage stress of the power device, with small power loss and simple structure.
Description
技术领域technical field
本发明涉及DC-DC变换器，尤其是涉及一种交错并联型DC-DC变换器的软开关。The invention relates to a DC-DC converter, in particular to a soft switch of an interleaved parallel DC-DC converter.
背景技术Background technique
随着能源和环保问题的日益加剧，光伏电池、燃料电池等新能源并网发电技术得到广泛关注。而光伏电池、燃料电池的输出电压等级较低，不能满足现有用电设备的供电要求，也无法进行并网传输，所以需要在这些发电模块与公共直流母线之间插入一个高增益高效率低输入电流纹波的高性能DC-DC变换器。为了有效提高直流变换器的电压增益，许多学者提出了多种具有高升压功能的变换器拓扑结构。反激变换器电路简单，通过调整反激变压器的匝比可实现高电压增益，但在低压输入高压输出应用场合，变压器原边匝数很少，导致变压器漏感所占激磁电感的比例明显增大，漏感不仅导致变换效率降低，同时会引起开关管关断电压尖峰过高。近年来，交错并联Boost变换器及其在燃料电池和光伏发电系统中得到了许多学者的广泛关注，采用交错并联方式可以减小输入、输出电流纹波，改善变换器的动态响应。但是，开关管的电压应力仍然等于输出电压，变换器的电压增益也没有得到提高。With the increasing energy and environmental issues, photovoltaic cells, fuel cells and other new energy grid-connected power generation technologies have received widespread attention. However, the output voltage level of photovoltaic cells and fuel cells is relatively low, which cannot meet the power supply requirements of existing electrical equipment, and cannot be connected to the grid. Therefore, it is necessary to insert a high-gain, high-efficiency High performance DC-DC converter with input current ripple. In order to effectively improve the voltage gain of the DC converter, many scholars have proposed a variety of converter topologies with high boost function. The circuit of the flyback converter is simple, and high voltage gain can be achieved by adjusting the turn ratio of the flyback transformer. However, in low-voltage input and high-voltage output applications, the number of turns on the primary side of the transformer is very small, resulting in a significant increase in the proportion of the transformer leakage inductance to the magnetizing inductance. Large, the leakage inductance will not only reduce the conversion efficiency, but also cause the switch off voltage peak to be too high. In recent years, the interleaved parallel Boost converter and its application in fuel cells and photovoltaic power generation systems have received widespread attention from many scholars. The interleaved parallel method can reduce input and output current ripples and improve the dynamic response of the converter. However, the voltage stress of the switch tube is still equal to the output voltage, and the voltage gain of the converter has not been improved.
发明内容Contents of the invention
本发明的目的在于提供功率开关管零电压开通、零电压关断的高增益输出和低电压应力的一种交错并联型DC-DC变换器的软开关。The purpose of the present invention is to provide a soft switch of an interleaved parallel DC-DC converter with high-gain output and low voltage stress for power switch tubes to be turned on at zero voltage and turned off at zero voltage.
本发明设有电源、输出电容、两个功率开关管、两个续流二极管、两个吸收电容、两个箝位电容、两个辅助开关、两个谐振电感、两个谐振电容、两个开关电容、两个输出二极管、第一耦合电感和第二耦合电感；所述第一耦合电感和第二耦合电感为三绕组耦合电感，所述三绕组耦合电感包含一个原边绕组和第一副边绕组和第二副边绕组；The invention is equipped with a power supply, an output capacitor, two power switch tubes, two freewheeling diodes, two absorbing capacitors, two clamping capacitors, two auxiliary switches, two resonant inductors, two resonant capacitors, and two switches capacitor, two output diodes, a first coupled inductor and a second coupled inductor; the first coupled inductor and the second coupled inductor are three-winding coupled inductors, and the three-winding coupled inductor includes a primary winding and a first secondary winding and second secondary winding;
所述第一耦合电感的原边绕组的一端与所述第二耦合电感原边绕组的一端及所述电源的正极相连，所述第一耦合电感的原边绕组的另一端与所述第一功率开关管的漏极和所述第一吸收电容的一端、所述第一辅助开关的漏极、所述第一开关电容的一端、所述第一箝位二极管的阳极相连；所述第一辅助开关的源极与所述第一谐振电感的一端相连；所述第一谐振电感的另一端与所述第一谐振电容的一端相连；所述第一开关电容的另一端与所述第一耦合电感的第一副边绕组的一端相连；所述第一耦合电感的第一副边绕组的另一端与所述第二耦合电感的第二副边绕组的一端相连；所述第二耦合电感的第二副边绕组的另一端与所述第一续流二极管的阴极及所述第一输出二极管的阳极相连；One end of the primary winding of the first coupled inductor is connected to one end of the primary winding of the second coupled inductor and the positive pole of the power supply, and the other end of the primary winding of the first coupled inductor is connected to the first The drain of the power switch tube is connected to one end of the first absorbing capacitor, the drain of the first auxiliary switch, one end of the first switching capacitor, and the anode of the first clamping diode; the first The source of the auxiliary switch is connected to one end of the first resonant inductance; the other end of the first resonant inductance is connected to one end of the first resonant capacitor; the other end of the first switched capacitor is connected to the first One end of the first secondary winding of the coupled inductor is connected; the other end of the first secondary winding of the first coupled inductor is connected with one end of the second secondary winding of the second coupled inductor; the second coupled inductor The other end of the second secondary winding is connected to the cathode of the first freewheeling diode and the anode of the first output diode;
所述第二耦合电感的原边绕组的另一端与所述第二功率开关管的漏极、所述第二吸收电容的一端、所述第二辅助开关的漏极、所述第二开关电容的一端、所述第二箝位二极管的阳极相连；所述第二辅助开关的源极与所述第二谐振电感的一端相连；所述第二谐振电感的另一端与所述第二谐振电容的一端相连；所述第二开关电容的另一端与所述第二耦合电感的第一副边绕组的一端相连；所述第二耦合电感的第一副边绕组的另一端与所述第一耦合电感的第二副边绕组的一端相连；所述第一耦合电感的第二副边绕组的另一端与所述第二续流二极管的阴极及所述第二输出二极管的阳极相连；The other end of the primary winding of the second coupled inductor is connected to the drain of the second power switch tube, one end of the second absorption capacitor, the drain of the second auxiliary switch, and the second switch capacitor One end of the second clamping diode is connected to the anode; the source of the second auxiliary switch is connected to one end of the second resonant inductor; the other end of the second resonant inductor is connected to the second resonant capacitor The other end of the second switched capacitor is connected to one end of the first secondary winding of the second coupled inductor; the other end of the first secondary winding of the second coupled inductor is connected to the first One end of the second secondary winding of the coupled inductor is connected; the other end of the second secondary winding of the first coupled inductor is connected to the cathode of the second freewheeling diode and the anode of the second output diode;
所述第一输出二极管的阴极和所述第二输出二极管的阴极及所述输出电容的一端相连，所述输出电容的另一端与所述电源的负极、所述第一功率开关管的漏极、所述第二功率开关管的漏极、所述第一吸收电容的一端、所述第二吸收电容的一端、所述第一谐振电容的一端、所述第二谐振电容的一端共同连接在一起。The cathode of the first output diode is connected to the cathode of the second output diode and one end of the output capacitor, and the other end of the output capacitor is connected to the negative pole of the power supply and the drain of the first power switch tube , the drain of the second power switch tube, one end of the first absorption capacitor, one end of the second absorption capacitor, one end of the first resonant capacitor, and one end of the second resonant capacitor are commonly connected to Together.
作为优选，还包括第一谐振电路和第二谐振电路。Preferably, a first resonant circuit and a second resonant circuit are also included.
作为优选，所述第一无源箝位谐振电路的一端与所述第一功率开关管的漏极及所述第一开关电容的一端连接，所述第一无源箝位谐振电路的另一端地与所述第二续流二极管的阳极相连；所述第二无源箝位谐振电路的一端与所述第二功率开关管的漏极及所述第二开关电容的一端连接，所述第二无源箝位电路的另一端地与所述第一续流二极管的阳极相连。所述第一谐振电路包括第一吸收电容、第一辅助开关、第一谐振电感、第一谐振电容；所述第二谐振电路包括第二吸收电容、第二辅助开关、第二谐振电感、第二谐振电容。Preferably, one end of the first passive clamp resonant circuit is connected to the drain of the first power switch tube and one end of the first switch capacitor, and the other end of the first passive clamp resonant circuit The ground is connected to the anode of the second freewheeling diode; one end of the second passive clamp resonant circuit is connected to the drain of the second power switch tube and one end of the second switching capacitor, and the first The other end of the two passive clamping circuits is connected to the anode of the first freewheeling diode. The first resonance circuit includes a first absorption capacitor, a first auxiliary switch, a first resonance inductor, and a first resonance capacitor; the second resonance circuit includes a second absorption capacitor, a second auxiliary switch, a second resonance inductor, and a second resonance inductor. Two resonant capacitors.
工作时，在主开关管导通前，辅助开关先导通。辅助开关导通后主开关电流下降，最后反向二极管导通，为主开关实现零电压导通做准备。开关管关断时在吸收电容的作用下，主开关实现了零电压关断。开通前谐振电感的电流为零，辅助开关实现了零电流导通。关断前辅助开关的反向并联二极管导通，辅助开关实现了零电压关断。When working, the auxiliary switch is first turned on before the main switch tube is turned on. After the auxiliary switch is turned on, the current of the main switch drops, and finally the reverse diode is turned on, preparing for the zero voltage conduction of the main switch. When the switching tube is turned off, under the action of the absorbing capacitor, the main switch realizes zero-voltage turn-off. The current of the resonant inductor is zero before turning on, and the auxiliary switch realizes zero current conduction. The anti-parallel diode of the auxiliary switch is turned on before turning off, and the auxiliary switch realizes zero-voltage turn-off.
本发明提出了一种带耦合电感和开关电容的高增益DC-DC变换器。该变换器电压增益高、功率等级高、输入电流纹波小、主开关管的电压应力小。在辅助电路的作用下，主开关实现了零电压开通和零电压关断，辅助开关实现了零电流导通和零电压关断。由于耦合电感的交叉耦合，变换器具有自动均流能力。The invention proposes a high-gain DC-DC converter with coupled inductors and switched capacitors. The converter has high voltage gain, high power level, small input current ripple, and low voltage stress of the main switching tube. Under the action of the auxiliary circuit, the main switch realizes zero-voltage turn-on and zero-voltage turn-off, and the auxiliary switch realizes zero-current turn-on and zero-voltage turn-off. Due to the cross-coupling of coupled inductors, the converter has automatic current sharing capability.
附图说明Description of drawings
图1为本发明实施例的电路组成原理图。FIG. 1 is a schematic diagram of circuit composition of an embodiment of the present invention.
图2为本发明实施例的等效电路。FIG. 2 is an equivalent circuit of an embodiment of the present invention.
图3为本发明实施例的开关模态1[t0t1]等效电路图。Fig. 3 is an equivalent circuit diagram of switching mode 1 [t 0 t 1 ] according to an embodiment of the present invention.
图4为本发明实施例的开关模态2[t1t2]等效电路图。Fig. 4 is an equivalent circuit diagram of switching mode 2 [t 1 t 2 ] according to an embodiment of the present invention.
图5为本发明实施例的开关模态3[t2t3]等效电路图。Fig. 5 is an equivalent circuit diagram of switching mode 3 [t 2 t 3 ] according to an embodiment of the present invention.
图6为本发明实施例的开关模态4[t3t4]等效电路图。Fig. 6 is an equivalent circuit diagram of switching mode 4 [t 3 t 4 ] according to an embodiment of the present invention.
图7为本发明实施例的开关模态5[t4t5]等效电路图。Fig. 7 is an equivalent circuit diagram of switching mode 5 [t 4 t 5 ] according to an embodiment of the present invention.
图8为本发明实施例的开关模态6[t5t6]等效电路图。Fig. 8 is an equivalent circuit diagram of switching mode 6 [t 5 t 6 ] according to an embodiment of the present invention.
图9为本发明实施例的开关模态7[t6t7]等效电路图。FIG. 9 is an equivalent circuit diagram of switching mode 7[t 6 t 7 ] according to an embodiment of the present invention.
图10为本发明实施例的开关模态8[t7t8]等效电路图。Fig. 10 is an equivalent circuit diagram of switching mode 8 [t 7 t 8 ] according to an embodiment of the present invention.
图11为本发明实施例的开关模态9[t8t9]等效电路图。Fig. 11 is an equivalent circuit diagram of switching mode 9 [t 8 t 9 ] according to an embodiment of the present invention.
图12为本发明实施例的开关模态10[t9t10]等效电路图。Fig. 12 is an equivalent circuit diagram of switching mode 10 [t 9 t 10 ] according to an embodiment of the present invention.
图13为本发明实施例的开关模态11[t10t11]等效电路图。Fig. 13 is an equivalent circuit diagram of switching mode 11 [t 10 t 11 ] according to an embodiment of the present invention.
图14为本发明实施例的关键波形图。Fig. 14 is a key waveform diagram of the embodiment of the present invention.
具体实施方式Detailed ways
下面通过结合附图和实施例对本发明做进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
参见图1，本发明提供的一种软开关高增益DC-DC变换器，包含两个功率管(S1、S2)，两个吸收电容(CS1、CS2)，两个辅助开关管(Sr1、Sr2)，两个谐振电感(Lr1、Lr2)，两个谐振电容(Cr1、Cr2)，两个箝位二极管(DC1、DC2)，两个箝位电容(CC1、CC2)，两个续流二极管(Df1、Df2)，两个开关电容(Cf1、Cf2)，两个输出二极管(Do1、Do2)，一个输出电容(Co)和两个三绕组耦合电感，其特征是第一耦合电感的原边绕组(L1p)的一端与第二耦合电感的原边绕组(L2p)的一端及电源(Vin)的正端相连，另一端则与第一功率管(S1)的漏极、第一箝位二极管(DC1)的阳极及第一开关电容(Cf1)的一端及第一吸收电容(CS1)的一端及第一辅助开关(Sr1)的漏极相连；第一箝位二极管(Dc1)的阴极与第一箝位电容(CC1)的一端及第二续流二极管的(Df2)的阳极相连，第一开关电容(Cf1)的另一端与第一三绕组耦合电感的第一副边绕组(L1s1)的一端相连，第一三绕组耦合电感的第一副边绕组(L1s1)的另一端与第二耦合电感的第二副边绕组(L2s2)的一端相连，第二三绕组耦合电感的第二副边绕组(L2s2)的另一端与第一续流二极管(Df1)的阴极及第一输出二极管(Do1)的阳极相连；第二三绕组耦合电感原边绕组(L2p)的另一端与第二功率开关管(S2)的漏极和第二箝位二极管(DC2)的阳极及第二开关电容的(Cf2)的一端及第二吸收电容(CS2)的一端及第二辅助开关管(Sr2)的漏极相连，第二箝位二极管(Dc2)的阴极与第二箝位电容(CC2)的一端及第一续流二极管(Df1)的阳极相连，第二开关电容(Cf2)的另一端与第二三绕组耦合电感的第一副边绕组(L2s1)的一端相连，第二三绕组耦合电感的第一副边绕组(L2s1)的另一端与第一三绕组耦合电感的第二副边绕组(L1s2)的一端相连，第一三绕组耦合电感第二副边绕组(L1s2)的另一端与第二续流二极管(Df2)的阴极及第二输出二极管(Do2)的阳极相连，第二输出二极管(Do2)的阴极与第一输出二极管(Do1)的阴极及输出电容(Co)的一端相连，输出电容(Co)的另一端与电源(Vin)的负端、第一功率开关管(S1)的源极、第二功率开关管(S2)的源极、第一吸收电容(CS1)的一端、第二吸收电容(CS2)的一端、第一谐振电容(Cr1)的一端、第二谐振电容(Cr2)的一端、第一箝位电容(CC1)的一端以及第二箝位电容(CC2)的一端共同连接在一起。Referring to Fig. 1, a soft-switching high-gain DC-DC converter provided by the present invention includes two power transistors (S 1 , S 2 ), two absorption capacitors (C S1 , C S2 ), and two auxiliary switch transistors (S r1 , S r2 ), two resonant inductors (L r1 , L r2 ), two resonant capacitors (C r1 , C r2 ), two clamping diodes (D C1 , D C2 ), two clamping capacitors (C C1 , C C2 ), two freewheeling diodes (D f1 , D f2 ), two switched capacitors (C f1 , C f2 ), two output diodes (D o1 , D o2 ), one output capacitor (C o ) and two three-winding coupled inductors, characterized in that one end of the primary winding (L 1p ) of the first coupled inductor and one end of the primary winding (L 2p ) of the second coupled inductor and the positive side of the power supply (V in ) The other end is connected to the drain of the first power transistor (S 1 ), the anode of the first clamping diode (D C1 ), one end of the first switching capacitor (C f1 ) and the first snubber capacitor (C S1 ) One end of the first auxiliary switch (S r1 ) is connected to the drain; the cathode of the first clamping diode (D c1 ) is connected to one end of the first clamping capacitor (C C1 ) and the second freewheeling diode (D f2 ) The anode of the first switched capacitor (C f1 ) is connected to one end of the first secondary winding (L 1s1 ) of the first three-winding coupled inductor, and the first secondary winding (L 1s1 ) of the first three-winding coupled inductor 1s1 ) is connected to one end of the second secondary winding (L 2s2 ) of the second coupled inductor, and the other end of the second secondary winding (L 2s2 ) of the second three-winding coupled inductor is connected to the first freewheeling diode ( The cathode of D f1 ) is connected to the anode of the first output diode (D o1 ); the other end of the second three-winding coupling inductor primary winding (L 2p ) is connected to the drain of the second power switch tube (S 2 ) and the second The anode of the clamping diode (D C2 ) is connected to one end of the second switch capacitor (C f2 ), one end of the second snubber capacitor (C S2 ) and the drain of the second auxiliary switch tube (S r2 ), and the second clamp The cathode of the bit diode (D c2 ) is connected to one end of the second clamping capacitor (C C2 ) and the anode of the first freewheeling diode (D f1 ), and the other end of the second switching capacitor (C f2 ) is connected to the second third winding One end of the first secondary winding (L 2s1 ) of the coupled inductor is connected, and the other end of the first secondary winding (L 2s1 ) of the second three-winding coupled inductor is connected to the second secondary winding (L 1s2 ), the other end of the second secondary winding (L 1s2 ) of the first three-winding coupling inductor is connected to the cathode of the second freewheeling diode (D f2 ) and the anode of the second output diode (D o2 ), and the second The cathode of the second output diode (D o2 ) is connected to the first output The cathode of the diode (D o1 ) is connected to one end of the output capacitor (C o ), and the other end of the output capacitor (C o ) is connected to the negative end of the power supply (V in ), the source of the first power switch tube (S 1 ), The source of the second power switch tube (S 2 ), one end of the first snubber capacitor (C S1 ), one end of the second snubber capacitor (C S2 ), one end of the first resonant capacitor (C r1 ), the second resonant capacitor One end of (C r2 ), one end of the first clamping capacitor (C C1 ) and one end of the second clamping capacitor (C C2 ) are commonly connected together.
上述的第一耦合电感的原边(L1p)与电源(Vin)正端的连接端和第一耦合电感副边第二绕组(L1s1)与第一开关电容(Cf1)的连接端以及第一耦合电感第二副边绕组(L1s2)与第二续流二极管(Df2)阴极的连接端为第一耦合电感的同名端；第二耦合电感的原边绕组(L2p)与电源(Vin)正端的连接端和第二耦合电感的第一副边绕组(L2s1)与第二开关电容(Cf2)的连接端以及第二耦合电感的第二副边绕组(L2s2)与第一续流二极管(Df1)阴极的连接端为第二耦合电感的同名端。The connection terminal between the primary side (L 1p ) of the above-mentioned first coupled inductor and the positive terminal of the power supply (V in ), the connection terminal between the secondary winding (L 1s1 ) of the first coupled inductor and the first switched capacitor (C f1 ), and The connection end of the second secondary winding (L 1s2 ) of the first coupled inductor and the cathode of the second freewheeling diode (D f2 ) is the terminal of the same name of the first coupled inductor; the primary winding (L 2p ) of the second coupled inductor is connected to the power supply (V in ) connection terminal of the positive terminal and the connection terminal of the first secondary winding (L 2s1 ) of the second coupled inductor and the second switching capacitor (C f2 ) and the second secondary winding (L 2s2 ) of the second coupled inductor The terminal connected to the cathode of the first freewheeling diode (D f1 ) is the same-named terminal of the second coupling inductor.
所述一种升压型变换器等效电路如图2所示，第一、二耦合电感副边的漏感归算到原边，分别用Lka、Lka表示，变换器有二十二个工作模态，如图3～13所示。由于电路的对称性，仅对其中的十一个模态进行分析：The equivalent circuit of a step-up converter is shown in Figure 2. The leakage inductances of the secondary side of the first and second coupled inductors are calculated to the primary side, which are represented by L ka and L ka respectively. The converter has 22 A working mode, as shown in Figure 3-13. Due to the symmetry of the circuit, only eleven of these modes are analyzed:
模态1[t0t1]:功率开关管(S1)、(S2)处于开通状态，输出二极管(Do1)、(Do2)都是反向偏置，箝位二极管(Dc1)、(Dc2)以及续流二极管(Df1)、(Df2)处于关断状态，输入电压对励磁电感(L1p)，(L2p)及各自漏感(Lka)，(Lka)线性充电。Mode 1[t 0 t 1 ]: The power switches (S 1 ), (S 2 ) are in the on state, the output diodes (D o1 ), (D o2 ) are both reverse biased, and the clamping diode (D c1 ), (D c2 ) and freewheeling diodes (D f1 ), (D f2 ) are in the off state, the input voltage has an effect on the excitation inductance (L 1p ), (L 2p ) and their respective leakage inductance (L ka ), (L ka ) linear charge.
模态2[t1t2]:在t1时刻，(S1)关断，第一耦合电感的励磁电感和漏感对第一吸收电容(CS1)线性充电。t1时刻，吸收电容的电压为零，主开关管实现了零电压关断。Mode 2 [t 1 t 2 ]: At time t 1 , (S 1 ) is turned off, and the excitation inductance and leakage inductance of the first coupled inductor linearly charge the first snubber capacitor (C S1 ). At time t 1 , the voltage of the absorbing capacitor is zero, and the main switching tube realizes zero-voltage turn-off.
模态3[t2t3]:在t2时刻，第一箝位管(DC1)反向压降降至零并开始导通，第一耦合电感的原边电流对第一箝位电容(CC1)充电，第一功率管S1依然关断，且其漏源电压被第一箝位电容(CC1)箝置，第一三绕组耦合电感漏感(Lka)中的能量转移到第一箝位电容(CC1)中。Mode 3[t 2 t 3 ]: At time t 2 , the reverse voltage drop of the first clamping transistor (D C1 ) drops to zero and starts to conduct, the primary current of the first coupled inductor has an effect on the first clamping capacitor (C C1 ) charging, the first power transistor S 1 is still off, and its drain-source voltage is clamped by the first clamp capacitor (C C1 ), the energy transfer in the leakage inductance (L ka ) of the first three-winding coupled inductor into the first clamp capacitor (C C1 ).
模态4[t3t4]:在t3时刻，第一输出二极管(Do1)开始导通，第一开关电容(Cf1)中的能量开始向负载转移。同时第二续流二极管(Df2)导通，第一箝位电容(CC1)中的能量转移到第二开关电容(Cf2)中。Mode 4 [t 3 t 4 ]: At time t 3 , the first output diode (D o1 ) starts to conduct, and the energy in the first switched capacitor (C f1 ) starts to transfer to the load. At the same time, the second freewheeling diode (D f2 ) is turned on, and the energy in the first clamping capacitor (C C1 ) is transferred to the second switching capacitor (C f2 ).
模态5[t4t5]：在t4时刻，第一箝位二极管(DC1)关断。Mode 5 [t 4 t 5 ]: At instant t 4 , the first clamping diode (D C1 ) is turned off.
模态6[t5t6]：在t5时刻，第一辅助开关管(Sr1)导通。主开关(S1)漏源电压开始谐振下降，第一辅助开关管(Sr1)的电流谐振上升，在第一谐振电感(Lr1)的作用下，第一辅助开关管(Sr1)实现了零电流导通。第一输出二极管(Do1)、第二续流二极管(Df2)的电流开始下降。Mode 6 [t 5 t 6 ]: at time t 5 , the first auxiliary switch (S r1 ) is turned on. The drain-source voltage of the main switch (S 1 ) begins to resonantly decrease, and the current of the first auxiliary switch (S r1 ) rises resonantly. Under the action of the first resonant inductance (L r1 ), the first auxiliary switch (S r1 ) realizes zero current conduction. The currents of the first output diode (D o1 ) and the second freewheeling diode (D f2 ) start to drop.
谐振周期为：The resonance period is:
其中 in
模态7[t6t7]:在t6时刻，第一输出二极管(Do1)和第二续流二极管(Df2)关断。此时，第一吸收电容(CS1)和第一谐振电容(Cr1)串联起来与第一谐振电感(Lr1)谐振。谐振周期为：Mode 7 [t 6 t 7 ]: At time t 6 , the first output diode (D o1 ) and the second freewheeling diode (D f2 ) are turned off. At this time, the first absorption capacitor (C S1 ) and the first resonant capacitor (C r1 ) are connected in series to resonate with the first resonant inductor (L r1 ). The resonance period is:
模态8[t7t8]:在t7时刻，第一吸收电容(Cs1)的电压谐振到零，第一功率开关管(S1)的反向并联二极管导通。第一谐振电感(Lr1)与第一谐振电容(Cr1)谐振。Mode 8 [t 7 t 8 ]: at time t 7 , the voltage of the first snubber capacitor (C s1 ) resonates to zero, and the antiparallel diode of the first power switch tube (S 1 ) conducts. The first resonant inductor (L r1 ) resonates with the first resonant capacitor (C r1 ).
谐振周期为：The resonance period is:
模态9[t8t9]:在t8时刻，第一功率开关管(S1)导通，由于反向二极管已导通，第一功率管(S1)实现了零电压导通。Mode 9[t 8 t 9 ]: at time t 8 , the first power switch (S 1 ) is turned on, and since the reverse diode has been turned on, the first power switch (S 1 ) realizes zero-voltage conduction.
模态10[t9t10]:在t9时刻，第一谐振电感(Lr1)的电流谐振到零并反向增大，第一辅助开关管(Sr1)的反向并联二极管导通。Mode 10[t 9 t 10 ]: At time t 9 , the current of the first resonant inductor (L r1 ) resonates to zero and increases in reverse, and the antiparallel diode of the first auxiliary switching tube (S r1 ) conducts .
模态11[t10t11]:在t10时刻，第一辅开关管(Sr1)导通，由于其反向并联二极管已经导通，因此，第一辅助开关管(Sr1)实现了零电压关断。Mode 11[t 10 t 11 ]: At time t 10 , the first auxiliary switching tube (S r1 ) is turned on, and since its anti-parallel diode has been turned on, the first auxiliary switching tube (S r1 ) realizes Zero voltage shutdown.
所述变换器的电压增益为：The voltage gain of the converter is:
其中T为主开关的周期，T1为主开关导通至辅助开关导通的时间。in T is the period of the main switch, and T1 is the time from when the main switch is turned on to when the auxiliary switch is turned on.
参见图3～13，均流的实现过程为：设第一、二功率开关管S1、S2导通占空分别比为D1、D2，两个耦合电感的两个副边绕组对各自原边绕组的匝数比都为N，则第一支路1的电压增益为：Referring to Figures 3-13, the realization process of current sharing is as follows: set the conduction duty ratios of the first and second power switch tubes S 1 and S 2 to D 1 and D 2 respectively, and the two secondary windings of the two coupled inductors are The turns ratio of each primary winding is N, then the voltage gain of the first branch 1 is:
同样，可以得到第二支路2的电压增益为：Similarly, the voltage gain of the second branch 2 can be obtained as:
可见Vo1＝Vo2，所以两个支路在各自占空比不等的情况下依然可实现自均流。It can be seen that V o1 =V o2 , so the two branches can still achieve self-leveling current when their respective duty ratios are not equal.
图14为该变换器工作时的关键波形图。Figure 14 is the key waveform diagram when the converter works.
本发明利用两个三绕组耦合电感的漏感来控制二极管中电流下降速率，从而解决二极管在关断时的反向恢复问题。利用两个三绕组耦合电感的第二、三绕组实现了变换器的高增益输出，利用两个开关电容则更进一步拓展了变换器的电压输出，也降低了功率器件的电压应力，整个变换器功率损耗小，结构较为简洁。The invention uses the leakage inductance of two three-winding coupling inductors to control the current drop rate in the diode, thereby solving the reverse recovery problem of the diode when it is turned off. The second and third windings of the two three-winding coupled inductors realize the high-gain output of the converter, and the use of two switched capacitors further expands the voltage output of the converter and reduces the voltage stress of the power device. The entire converter The power loss is small and the structure is relatively simple.
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