CN108696139B - Modularized input phase number-adjustable high-boost isolation type DC-DC converter - Google Patents
Modularized input phase number-adjustable high-boost isolation type DC-DC converter Download PDFInfo
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- CN108696139B CN108696139B CN201810575184.2A CN201810575184A CN108696139B CN 108696139 B CN108696139 B CN 108696139B CN 201810575184 A CN201810575184 A CN 201810575184A CN 108696139 B CN108696139 B CN 108696139B
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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
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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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
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
Description
技术领域Technical field
本发明涉及一种隔离型直流-直流变换器，具体是一种模块化输入相数可调的高升压隔离型DC/DC变换器。The invention relates to an isolated DC-DC converter, specifically a high-boost isolated DC/DC converter with an adjustable modular input phase number.
背景技术Background technique
近年来，海上风力发电技术发展迅速，其直流汇流场中通常需要数十倍甚至更高的电压增益，所处理的功率容量更是高达数兆瓦甚至更高，现有的方案难以适用，需要增益、容量更高的变换器。In recent years, offshore wind power generation technology has developed rapidly. Its DC bus field usually requires a voltage gain of dozens of times or even higher, and the power capacity handled is as high as several megawatts or even higher. The existing solutions are difficult to apply and require Converters with higher gain and capacity.
现有技术中，传统的升压型隔离变换器，输出电压增益常通过扩大变压器初次级绕组的匝数比来实现，但一方面大容量高匝数比高频变压器的设计与制作难度均大，另一方面也存在开关器件电压及电流应力高的问题。针对以上问题目前所研究的变换器主要有三种：第一种是双全桥DC/DC变换器，该类变换器有软开关易实现，功率密度高，可提供电气隔离等优点，但该类变换器存在输出电压增益小，多模块并联时均流困难等问题；第二种是基于MMC技术的变换器，通过子模块之间的串并联来减小元器件应力以实现高升压，其高度模块化结构可实现冗余控制，系统可靠性高，但该类变换器通常需要复杂的控制策略且驱动电路较为复杂；第三种是LLC谐振型变换器，该类变换器的变压器励磁电感值对电压增益几乎无影响,大大简化了磁性元件的选择设计过程,并且可以通过取较大的励磁电感值来减小导通损耗，但该类变换器同样存在多模块并联运行时，各模块之间均流控制策略复杂的问题。In the existing technology, the output voltage gain of traditional boost-type isolation converters is often achieved by expanding the turns ratio of the primary and secondary windings of the transformer. However, on the one hand, it is difficult to design and manufacture large-capacity and high-turns-ratio high-frequency transformers. , on the other hand, there is also the problem of high voltage and current stress on switching devices. There are three main types of converters currently being studied to address the above problems: the first is a dual full-bridge DC/DC converter. This type of converter has soft switching that is easy to implement, has high power density, and can provide electrical isolation and other advantages. However, this type of converter The converter has problems such as small output voltage gain and difficulty in current sharing when multiple modules are connected in parallel; the second is a converter based on MMC technology, which reduces component stress through series and parallel connections between sub-modules to achieve high voltage boost. The modular structure can achieve redundant control and high system reliability, but this type of converter usually requires complex control strategies and the drive circuit is relatively complex; the third type is the LLC resonant converter, the transformer excitation inductance value of this type of converter It has almost no effect on the voltage gain, greatly simplifying the selection and design process of magnetic components, and the conduction loss can be reduced by taking a larger excitation inductance value. However, this type of converter also has multiple modules running in parallel. The current sharing control strategy is a complex problem.
发明内容Contents of the invention
为解决现有大容量高增益隔离型DC/DC变换器中所面临的器件电压电流应力高、输入输出增益低、多模块并联运行均流困难等问题。本发明提出一种模块化输入相数可调的高升压隔离型DC/DC变换器。该变换器可以通过调节模块化的输入相数实现变换器中元器件电流应力的调节，通过调节各模块中二极管与电容的数量可实现对变换器输入输出增益及开关器件电压应力的调节。同时各输入相自动均流的特点简化了控制及驱动电路的设计。In order to solve the problems faced by existing large-capacity and high-gain isolated DC/DC converters such as high device voltage and current stress, low input and output gain, and difficulty in current sharing in parallel operation of multiple modules. The invention proposes a modular high-boost isolation DC/DC converter with adjustable input phase number. This converter can adjust the current stress of components in the converter by adjusting the number of modular input phases. By adjusting the number of diodes and capacitors in each module, the input and output gain of the converter and the voltage stress of the switching device can be adjusted. At the same time, the automatic current sharing feature of each input phase simplifies the design of control and drive circuits.
本发明采取的技术方案为：The technical solutions adopted by the present invention are:
一种模块化输入相数可调的高升压隔离型DC/DC变换器，该变换器包含一个直流输入源，m个模块，二极管D0，输出滤波电容C0，负载RL。A high-boost isolation DC/DC converter with an adjustable modular input phase number. The converter includes a DC input source, m modules, diode D 0 , output filter capacitor C 0 , and load R L .
其中m个模块如下：Among them, m modules are as follows:
模块一包括:电感L1，功率开关S1，功率开关S1漏源极电容CVT1，辅助开关STC1，箝位电容CC1，漏感LK1，隔离变压器T1，二极管D12、D13···D1n，电容C12、C13···C1n。电感L1的一端接输入电源的正极，另一端连接漏感LK1的一端，同时与功率开关S1的漏极及箝位辅助开关STC1的源极相连，功率开关S1的源极与箝位电容CC1另一端相连然后接地，辅助开关STC1的漏极与箝位电容CC1一端相连，漏感LK1的另一端与变压器T1一次侧的一端相连，变压器T1二次侧一端与二极管D21的阳极及电容C12、C13···C1n的另一端相连，同时与滤波电容Co以及负载RL的另一端相连。二极管D12的阴极与电容C12的一端相连，二极管D13的阴极与电容C13的一端相连，...，以此类推二极管D1n的阴极与电容C1n的一端相连。Module 1 includes: inductor L 1 , power switch S 1 , power switch S 1 drain-source capacitor C VT1 , auxiliary switch S TC1 , clamp capacitor C C1 , leakage inductance L K1 , isolation transformer T 1 , diodes D 12 , D 13 ···D 1n , capacitance C 12 , C 13 ···C 1n . One end of the inductor L 1 is connected to the positive pole of the input power supply, and the other end is connected to one end of the leakage inductance L K1 . It is also connected to the drain of the power switch S 1 and the source of the clamp auxiliary switch S TC1 . The source of the power switch S 1 is connected to The other end of the clamping capacitor C C1 is connected to ground, the drain of the auxiliary switch S TC1 is connected to one end of the clamping capacitor C C1 , the other end of the leakage inductance L K1 is connected to one end of the primary side of the transformer T 1 , and the secondary side of the transformer T 1 One end is connected to the anode of diode D 21 and the other end of capacitors C 12 , C 13 ···C 1n , and at the same time, it is connected to the other end of filter capacitor C o and load R L. The cathode of diode D 12 is connected to one end of capacitor C 12 , the cathode of diode D 13 is connected to one end of capacitor C 13 ,..., and so on, the cathode of diode D 1n is connected to one end of capacitor C 1n .
模块二包括:电感L2，功率开关S2，功率开关S2漏源极电容CVT2，辅助开关STC2，箝位电容CC2，漏感LK2，隔离变压器T2，二极管D21、D22···D2n，电容C21、C22···C2n。电感L2的一端接输入电源的正极，另一端连接漏感LK2的一端，同时与功率开关S2的漏极及箝位辅助开关STC2的源极相连，功率开关S2的源极与箝位电容CC2另一端相连然后接地，辅助开关STC2的漏极与箝位电容CC2一端相连，漏感LK2的另一端与变压器T2一次侧的一端相连，变压器T2二次侧一端与电容C21、C22···C2n的另一端相连，二极管D21的阴极与电容C21的一端相连，二极管D22的阴极与电容C22的一端相连，...，以此类推二极管D2n的阴极与电容C2n的一端相连。Module 2 includes: inductor L 2 , power switch S 2 , power switch S 2 drain-source capacitor C VT2 , auxiliary switch S TC2 , clamp capacitor C C2 , leakage inductance L K2 , isolation transformer T 2 , diodes D 21 , D 22 ···D 2n , capacitance C 21 , C 22 ···C 2n . One end of the inductor L 2 is connected to the positive pole of the input power supply, and the other end is connected to one end of the leakage inductance L K2 . It is also connected to the drain of the power switch S 2 and the source of the clamp auxiliary switch S TC2 . The source of the power switch S 2 is connected to The other end of the clamping capacitor C C2 is connected to ground, the drain of the auxiliary switch S TC2 is connected to one end of the clamping capacitor C C2 , the other end of the leakage inductance L K2 is connected to one end of the primary side of the transformer T 2 , and the secondary side of the transformer T 2 One end is connected to the other end of the capacitor C 21 , C 22 ···C 2n , the cathode of the diode D 21 is connected to one end of the capacitor C 21 , the cathode of the diode D 22 is connected to one end of the capacitor C 22 ,..., with this By analogy, the cathode of diode D 2n is connected to one end of capacitor C 2n .
模块三包括:电感L3，功率开关S3，功率开关S3漏源极电容CVT3，辅助开关STC3，箝位电容CC3，漏感LK3，隔离变压器T3，二极管D31、D32···D3n，电容C31、C32···C3n。电感L3的一端接输入电源的正极，另一端连接漏感LK3的一端，同时与功率开关S3的漏极及箝位辅助开关STC3的源极相连，功率开关S3的源极与箝位电容CC3另一端相连然后接地，辅助开关STC3的漏极与箝位电容CC3一端相连，漏感LK3的另一端与变压器T3一次侧的一端相连，变压器T3二次侧一端与电容C31、C32···C3n的另一端相连，二极管D31的阴极与电容C31的一端相连，二极管D32的阴极与电容C32的一端相连，...，以此类推二极管D3n的阴极与电容C3n的一端相连。 Module three includes: inductor L 3 , power switch S 3 , power switch S 3 drain-source capacitor C VT3 , auxiliary switch S TC3 , clamp capacitor C C3, leakage inductance L K3 , isolation transformer T 3 , diodes D 31 , D 32 ···D 3n , capacitance C 31 , C 32 ···C 3n . One end of the inductor L 3 is connected to the positive pole of the input power supply, and the other end is connected to one end of the leakage inductance L K3 . It is also connected to the drain of the power switch S 3 and the source of the clamp auxiliary switch S TC3 . The source of the power switch S 3 is connected to The other end of the clamping capacitor C C3 is connected to ground, the drain of the auxiliary switch S TC3 is connected to one end of the clamping capacitor C C3 , the other end of the leakage inductance L K3 is connected to one end of the primary side of the transformer T 3 , and the secondary side of the transformer T 3 One end is connected to the other end of the capacitor C 31 , C 32 ···C 3n , the cathode of the diode D 31 is connected to one end of the capacitor C 31 , the cathode of the diode D 32 is connected to one end of the capacitor C 32 ,..., with this By analogy, the cathode of diode D 3n is connected to one end of capacitor C 3n .
......以此类推；...and so on;
模块m包括:电感Lm，功率开关Sm，功率开关Sm漏源极电容CVTm，辅助开关STCm，箝位电容CCm，漏感LKm，隔离变压器Tm，二极管Dm1、Dm2···Dnm，电容Cm1、Cm2···Cnm。电感Lm的一端接输入电源的正极，另一端连接漏感LKm的一端，同时与功率开关Sm的漏极及箝位辅助开关STCm的源极相连，功率开关Sm的源极与箝位电容CCm另一端相连然后接地，辅助开关STCm的漏极与箝位电容CCm一端相连，漏感LKm的另一端与变压器Tm一次侧的一端相连，变压器Tm副边一端依次连接在电容Cm1、Cm2···Cnm的另一端，二极管Dm1的阴极与电容Cm1的一端相连，二极管Dm2的阴极与电容Cm2的一端相连，...，以此类推二极管Dmn的阴极与电容Cmn的一端相连。二极管Dmn的阴极与电容Cmn的一端之间的节点与二极管D0的阳极相连。Module m includes: inductor L m , power switch S m , power switch S m drain-source capacitance C VTm , auxiliary switch S TCm , clamp capacitor C Cm , leakage inductance L Km , isolation transformer T m , diodes D m1 , D m2 ···D nm , capacitance C m1 , C m2 ···C nm . One end of the inductor L m is connected to the positive pole of the input power supply, and the other end is connected to one end of the leakage inductance L Km . It is also connected to the drain of the power switch S m and the source of the clamp auxiliary switch S TCm . The source of the power switch S m is connected to The other end of the clamping capacitor C Cm is connected to ground, the drain of the auxiliary switch S TCm is connected to one end of the clamping capacitor C Cm , the other end of the leakage inductance L Km is connected to one end of the primary side of the transformer T m , and one end of the secondary side of the transformer T m Connect to the other ends of the capacitors C m1 and C m2 ...C nm in turn, the cathode of the diode D m1 is connected to one end of the capacitor C m1 , the cathode of the diode D m2 is connected to one end of the capacitor C m2 ,..., so By analogy, the cathode of the diode D mn is connected to one end of the capacitor C mn . The node between the cathode of the diode D mn and one end of the capacitor C mn is connected to the anode of the diode D 0 .
模块与模块之间的连接关系为：第一个模块中变压器T1二次侧一端与电容C12另一端之间的节点接模块二中二极管D21的阳极，第一个模块中二极管D12阴极与C12一端之间的节点接模块二中二极管D22的阳极，第一个模块中二极管D13阴极与C13一端之间的节点接模块二中二极管D23的阳极，...，以此类推，第一个模块中二极管D1n的阴极与电容C1n一端之间的节点接模块二中二极管D2n的阳极。The connection relationship between modules is: the node between one end of the secondary side of the transformer T 1 in the first module and the other end of the capacitor C 12 is connected to the anode of the diode D 21 in the second module, and the diode D 12 in the first module The node between the cathode and one end of C 12 is connected to the anode of diode D 22 in module two. The node between the cathode of diode D 13 and one end of C 13 in the first module is connected to the anode of diode D 23 in module two,..., By analogy, the node between the cathode of the diode D 1n in the first module and one end of the capacitor C 1n is connected to the anode of the diode D 2n in the second module.
第二个模块中二极管D21阴极与C21一端之间的节点接模块三中二极管D31的阳极，第二个模块中二极管D22阴极与C22一端之间的节点接模块三中二极管D32阳极，...，以此类推，第二个模块中二极管D2n阴极与C2n一端之间的节点接模块三中二极管D3n阳极。The node between the cathode of diode D 21 and one end of C 21 in the second module is connected to the anode of diode D 31 in module three. The node between the cathode of diode D 22 and one end of C 22 in the second module is connected to diode D in module three. 32 anode,..., and so on, the node between the cathode of diode D 2n in the second module and one end of C 2n is connected to the anode of diode D 3n in module three.
以此类推，第m-1个模块中二极管Dm-11阴极与电容Cm-11一端之间的节点接模块m中二极管Dm1的阳极，第m-1个模块中二极管Dm-12阴极与电容Cm-12一端之间的节点接模块m中二极管Dm2的阳极，...，以此类推，第m-1个模块中二极管Dm-1n的阴极与电容Cm-1n一端之间的节点接模块m中二极管Dmn的阳极。By analogy, the node between the cathode of the diode D m-11 in the m-1th module and one end of the capacitor C m-11 is connected to the anode of the diode D m1 in the module m, and the diode D m-12 in the m-1th module The node between the cathode and one end of the capacitor C m-12 is connected to the anode of the diode D m2 in module m,..., and so on, the cathode of the diode D m-1n in the m-1th module is connected to the capacitor C m-1n The node between one end is connected to the anode of the diode D mn in module m.
第m个模块中二极管Dm1阴极与电容Cm1一端之间的节点接模块一中二极管D12的阳极，第m个模块中二极管Dm2阴极与电容Cm2一端之间的节点接模块一中二极管D13的阳极，...，以此类推，第m个模块中二极管Dmn-1阴极与电容Cmn-1一端之间的节点接模块一中二极管D1n的阳极。The node between the cathode of diode D m1 and one end of capacitor C m1 in the m-th module is connected to the anode of diode D 12 in module one. The node between the cathode of diode D m2 and one end of capacitor C m2 in the m-th module is connected to module one. The anode of diode D 13 ,..., and so on, the node between the cathode of diode D mn-1 in the m-th module and one end of capacitor C mn-1 is connected to the anode of diode D 1n in module one.
负载RL与C0并联，负载RL一端接二极管D0的阴极，另一端接到模块一中压器T1二次侧一端与电容C12另一端之间的节点。二极管D0的阳极与二极管Dmn的阴极与电容Cmn的一端之间的节点相连。模块与模块之间的变压器一次侧的另一端接到一起，二次侧的另一端也接在一起。The load R L is connected in parallel with C 0. One end of the load R L is connected to the cathode of the diode D 0 , and the other end is connected to the node between the secondary side end of the module one medium voltage device T 1 and the other end of the capacitor C 12 . The anode of the diode D 0 is connected to a node between the cathode of the diode D mn and one end of the capacitor C mn . The other ends of the primary side of the transformer between modules are connected together, and the other ends of the secondary side are also connected together.
该变换器m个功率开关S1、S2...Sm的栅极分别接各自的控制器，m个辅助开关STC1、STC2...STCm的栅极也分别接各自的控制器，下标为奇数的功率开关S1、S3、...控制信号一致，下标为偶数的功率开关S2、S4、...控制信号一致，且两者相位相差180°，辅助箝位开关与所对应支路的功率开关互补导通。The gates of the m power switches S 1 , S 2 ...S m of the converter are respectively connected to their respective controllers, and the gates of the m auxiliary switches S TC1 , S TC2 ...S TCm are also connected to their respective controls. The control signals of the power switches S 1 , S 3 ,... whose subscripts are odd numbers are consistent, and the control signals of the power switches S 2 , S 4 ,... whose subscripts are even numbers are consistent, and the phase difference between the two is 180°. The auxiliary clamp switch is complementary to the power switch of the corresponding branch.
本发明所提一种模块化输入相数可调的高升压隔离型DC/DC变换器，技术效果如下：The invention proposes a modular high-boost isolation DC/DC converter with adjustable input phase number. The technical effects are as follows:
1、输入输出增益高且可调，开关器件电压电流应力低且可调。其中：1. The input and output gain is high and adjustable, and the voltage and current stress of the switching device is low and adjustable. in:
输出电压与输入电压的比值为： The ratio of output voltage to input voltage is:
开关管电压应力为： The voltage stress of the switch tube is:
二极管的电压应力为： The voltage stress of the diode is:
输出二极管的电压应力为： The voltage stress of the output diode is:
开关管的电流应力为： The current stress of the switching tube is:
二极管的电流应力 Diode current stress
其中：D为占空比；m为输入相数；n为模块中的二极管、或者电容数量；N为变压器参数比。Among them: D is the duty cycle; m is the number of input phases; n is the number of diodes or capacitors in the module; N is the transformer parameter ratio.
2、各个模块之间可实现自动均流，控制策略及驱动电路简单。2. Automatic current sharing can be achieved between each module, and the control strategy and drive circuit are simple.
3、所有开关管实现了零电压导通，二极管实现了零电流关断，变换器工作效率较高。3. All switch tubes realize zero-voltage conduction, and the diodes realize zero-current turn-off, and the converter has high working efficiency.
附图说明Description of the drawings
图1是本发明电路原理总图。Figure 1 is a general diagram of the circuit principle of the present invention.
图2是本发明为n＝2，m＝4的电路拓扑图。Figure 2 is a circuit topology diagram of the present invention where n=2, m=4.
图3是本发明主开关S1、S2驱动信号、电压、电流波形图。Figure 3 is a waveform diagram of the driving signals, voltage and current of the main switches S 1 and S 2 of the present invention.
图4是本发明辅助开关STC1、STC2驱动信号、电压、电流波形图。Figure 4 is a waveform diagram of the driving signals, voltage and current of the auxiliary switches S TC1 and S TC2 of the present invention.
图5是本发明箝位电容VCC1、VCC2电压波形和输入、输出电压波形图。Figure 5 is a diagram of the voltage waveforms of the clamping capacitors V CC1 and V CC2 and the input and output voltage waveforms of the present invention.
图6是本发明电感IL1、IL2电流及漏感ILK1、ILK2电流波形图。Figure 6 is a waveform diagram of the currents of the inductors I L1 and IL2 and the currents of the leakage inductors I LK1 and I LK2 of the present invention.
图7是本发明电容C21～C42电压波形图。Figure 7 is a voltage waveform diagram of capacitors C 21 to C 42 of the present invention.
图8是本发明二极管D21、D31电压电流波形图。Figure 8 is a voltage and current waveform diagram of diodes D 21 and D 31 of the present invention.
具体实施方式Detailed ways
下面结合附图对本发明作进一步详细说明。The present invention will be further described in detail below in conjunction with the accompanying drawings.
如图2所示，一种模块化的4输入相数隔离型DC/DC变换器，它包含4个模块，4个输入相，4个电感L1、L2、L3、L4，4个功率开关S1、S2、S3、S4，4个功率开关漏源极电容CVT1、CVT2、CVT3、CVT4，4个辅助开关STC1、STC2、STC3、STC4，4个箝位电容CC1、CC2、CC3、CC4，4个变压器，8个电容C0、C12、C21、C31、C41、C22、C32、C42，8个二极管D0、D12、D21、D31、D41、D22、D32、D42；As shown in Figure 2, a modular 4-input phase isolated DC/DC converter contains 4 modules, 4 input phases, 4 inductors L 1 , L 2 , L 3 , L 4 , 4 power switches S 1 , S 2 , S 3 , S 4 , 4 power switch drain-source capacitances C VT1 , C VT2 , C VT3 , C VT4 , and 4 auxiliary switches S TC1 , S TC2 , S TC3 , S TC4 , 4 clamping capacitors C C1 , C C2 , C C3 , C C4 , 4 transformers, 8 capacitors C 0 , C 12 , C 21 , C 31 , C 41 , C 22 , C 32 , C 42 , 8 diodes D 0 , D 12 , D 21 , D 31 , D 41 , D 22 , D 32 , D 42 ;
其中：4个模块中，Among them: among 4 modules,
模块一包括:电感L1，功率开关S1，功率开关S1漏源极电容CVT1，辅助开关STC1，箝位电容CC1，漏感LK1，隔离变压器T1，二极管D12，电容C12。电感L1的一端接输入电源的正极，另一端连接漏感LK1的一端，同时与功率开关S1的漏极及箝位辅助开关STC1的源极相连，功率开关S1的源极与箝位电容CC1另一端相连然后接地，辅助开关STC1的漏极与箝位电容CC1一端相连，漏感LK1的另一端与变压器T1一次侧的一端相连，变压器T1二次侧一端与二极管D21的阳极及电容C12的另一端相连，同时与滤波电容Co以及负载RL的另一端相连。二极管D12的阴极与电容C12的一端相连。 Module 1 includes: inductor L 1 , power switch S 1 , power switch S 1 drain-source capacitor C VT1 , auxiliary switch S TC1 , clamp capacitor C C1, leakage inductance L K1 , isolation transformer T 1 , diode D 12 , capacitor C12 . One end of the inductor L 1 is connected to the positive pole of the input power supply, and the other end is connected to one end of the leakage inductance L K1 . It is also connected to the drain of the power switch S 1 and the source of the clamp auxiliary switch S TC1 . The source of the power switch S 1 is connected to The other end of the clamping capacitor C C1 is connected to ground, the drain of the auxiliary switch S TC1 is connected to one end of the clamping capacitor C C1 , the other end of the leakage inductance L K1 is connected to one end of the primary side of the transformer T 1 , and the secondary side of the transformer T 1 One end is connected to the anode of the diode D 21 and the other end of the capacitor C 12 , and at the same time, it is connected to the filter capacitor C o and the other end of the load RL . The cathode of diode D 12 is connected to one end of capacitor C 12 .
模块二包括:电感L2，功率开关S2，功率开关S2漏源极电容CVT2，辅助开关STC2，箝位电容CC2，漏感LK2，隔离变压器T2，二极管D21、D22，电容C21、C22。电感L2的一端接输入电源的正极，另一端连接漏感LK2的一端，同时与功率开关S2的漏极及箝位辅助开关STC2的源极相连，功率开关S2的源极与箝位电容CC2另一端相连然后接地，辅助开关STC2的漏极与箝位电容CC2一端相连，漏感LK2的另一端与变压器T2一次侧的一端相连，变压器T2二次侧一端与电容C21、C22的另一端相连，二极管D21的阴极与电容C21的一端相连，二极管D22的阴极与电容C22的一端相连。Module 2 includes: inductor L 2 , power switch S 2 , power switch S 2 drain-source capacitor C VT2 , auxiliary switch S TC2 , clamp capacitor C C2 , leakage inductance L K2 , isolation transformer T 2 , diodes D 21 , D 22 , capacitor C 21 , C 22 . One end of the inductor L 2 is connected to the positive pole of the input power supply, and the other end is connected to one end of the leakage inductance L K2 . It is also connected to the drain of the power switch S 2 and the source of the clamp auxiliary switch S TC2 . The source of the power switch S 2 is connected to The other end of the clamping capacitor C C2 is connected to ground, the drain of the auxiliary switch S TC2 is connected to one end of the clamping capacitor C C2 , the other end of the leakage inductance L K2 is connected to one end of the primary side of the transformer T 2 , and the secondary side of the transformer T 2 One end is connected to the other ends of the capacitors C 21 and C 22 , the cathode of the diode D 21 is connected to one end of the capacitor C 21 , and the cathode of the diode D 22 is connected to one end of the capacitor C 22 .
模块三包括:电感L3，功率开关S3，功率开关S3漏源极电容CVT3，辅助开关STC3，箝位电容CC3，漏感LK3，隔离变压器T3，二极管D31、D32，电容C31、C32。电感L3的一端接输入电源的正极，另一端连接漏感LK3的一端，同时与功率开关S3的漏极及箝位辅助开关STC3的源极相连，功率开关S3的源极与箝位电容CC3另一端相连然后接地，辅助开关STC3的漏极与箝位电容CC3一端相连，漏感LK3的另一端与变压器T3一次侧的一端相连，变压器T3二次侧一端与电容C31、C32的另一端相连，二极管D31的阴极与电容C31的一端相连，二极管D32的阴极与电容C32的一端相连。 Module three includes: inductor L 3 , power switch S 3 , power switch S 3 drain-source capacitor C VT3 , auxiliary switch S TC3 , clamp capacitor C C3, leakage inductance L K3 , isolation transformer T 3 , diodes D 31 , D 32 , capacitor C 31 , C 32 . One end of the inductor L 3 is connected to the positive pole of the input power supply, and the other end is connected to one end of the leakage inductance L K3 . It is also connected to the drain of the power switch S 3 and the source of the clamp auxiliary switch S TC3 . The source of the power switch S 3 is connected to The other end of the clamping capacitor C C3 is connected to ground, the drain of the auxiliary switch S TC3 is connected to one end of the clamping capacitor C C3 , the other end of the leakage inductance L K3 is connected to one end of the primary side of the transformer T 3 , and the secondary side of the transformer T 3 One end is connected to the other ends of the capacitors C 31 and C 32 , the cathode of the diode D 31 is connected to one end of the capacitor C 31 , and the cathode of the diode D 32 is connected to one end of the capacitor C 32 .
模块四包括:电感L4，功率开关S4，功率开关S4漏源极电容CVT4，辅助开关STC4，箝位电容CC4，漏感LK4，隔离变压器T4，二极管D41、D42，电容C41、C42。电感L4的一端接输入电源的正极，另一端连接漏感LK4的一端，同时与功率开关S4的漏极及箝位辅助开关STC4的源极相连，功率开关S4的源极与箝位电容CC4另一端相连然后接地，辅助开关STC4的漏极与箝位电容CC4一端相连，漏感LK4的另一端与变压器T4一次侧的一端相连，变压器T4副边一端依次连接在电容C41、C42的另一端，二极管D41的阴极与电容C41的一端相连，二极管D42的阴极与电容C42的一端相连。二极管D42的阴极与电容C42的一端之间的节点与二极管D0的阳极相连。Module four includes: inductor L 4 , power switch S 4 , power switch S 4 drain-source capacitor C VT4 , auxiliary switch S TC4 , clamp capacitor C C4 , leakage inductance L K4 , isolation transformer T 4 , diodes D 41 , D 42 , capacitor C 41 , C 42 . One end of the inductor L 4 is connected to the positive pole of the input power supply, and the other end is connected to one end of the leakage inductance L K4 . It is also connected to the drain of the power switch S 4 and the source of the clamp auxiliary switch S TC4 . The source of the power switch S 4 is connected to The other end of the clamping capacitor C C4 is connected to ground, the drain of the auxiliary switch S TC4 is connected to one end of the clamping capacitor C C4 , the other end of the leakage inductance L K4 is connected to one end of the primary side of the transformer T 4 , and one end of the secondary side of the transformer T 4 The other ends of the capacitors C 41 and C 42 are connected in sequence, the cathode of the diode D 41 is connected to one end of the capacitor C 41 , and the cathode of the diode D 42 is connected to one end of the capacitor C 42 . The node between the cathode of diode D 42 and one end of capacitor C 42 is connected to the anode of diode D 0 .
模块与模块之间的连接关系为：第一个模块中变压器T1二次侧一端与电容C12另一端之间的节点接模块二中二极管D21的阳极，第一个模块中二极管D12阴极与C12一端之间的节点接模块二中二极管D22的阳极。The connection relationship between modules is: the node between one end of the secondary side of the transformer T 1 in the first module and the other end of the capacitor C 12 is connected to the anode of the diode D 21 in the second module, and the diode D 12 in the first module The node between the cathode and one end of C 12 is connected to the anode of diode D 22 in module two.
第二个模块中二极管D21阴极与C21一端之间的节点接模块三中二极管D31的阳极，第二个模块中二极管D22阴极与C22一端之间的节点接模块三中二极管D32阳极。The node between the cathode of diode D 21 and one end of C 21 in the second module is connected to the anode of diode D 31 in module three. The node between the cathode of diode D 22 and one end of C 22 in the second module is connected to diode D in module three. 32 anode.
第三个模块中二极管D31阴极与电容C31一端之间的节点接模块四中二极管D41的阳极，第三个模块中二极管D32阴极与电容C32一端之间的节点接模块四中二极管D42的阳极。The node between the cathode of diode D 31 and one end of capacitor C 31 in the third module is connected to the anode of diode D 41 in module four. The node between the cathode of diode D 32 and one end of capacitor C 32 in the third module is connected to module four. Anode of diode D 42 .
第四个模块中二极管D41阴极与电容C41一端之间的节点接模块一中二极管D12的阳极。The node between the cathode of the diode D 41 in the fourth module and one end of the capacitor C 41 is connected to the anode of the diode D 12 in the first module.
负载RL与C0并联，负载RL一端接二极管D0的阴极，另一端接到模块一中压器T1二次侧一端与电容C12另一端之间的节点。二极管D0的阳极与二极管D42的阴极与电容C42的一端之间的节点相连。模块与模块之间的变压器一次侧的另一端接到一起，二次侧的另一端也接在一起。The load R L is connected in parallel with C 0. One end of the load R L is connected to the cathode of the diode D 0 , and the other end is connected to the node between the secondary side end of the module one medium voltage device T 1 and the other end of the capacitor C 12 . The anode of diode D 0 is connected to a node between the cathode of diode D 42 and one end of capacitor C 42 . The other ends of the primary side of the transformer between modules are connected together, and the other ends of the secondary side are also connected together.
2、根据1所述4个功率开关S1、S2、S3、S4的栅极分别接各自的控制器，功率开关S1、S3控制信号一致，功率开关S2、S4控制信号一致，且两者相位相差180°。2. According to 1, the gates of the four power switches S 1 , S 2 , S 3 and S 4 are respectively connected to their respective controllers. The control signals of power switches S1 and S3 are consistent, and the control signals of power switches S2 and S4 are consistent, and The two are 180° out of phase.
为简化其分析过程，均假设：①电感电流IL1、IL2、IL3、IL4连续；②电容C0～C8足够大，其上电压保持不变；③所有器件都是理想器件，不考虑寄生参数等的影响；④箝位电容与漏感间的谐振周期远大于开关关断时间，且忽略箝位电容上的电压纹波；⑤有源开关全采用交错控制策略，而且开关占空比D>0.5；⑥辅助开关STC1、STC2、STC3、STC4与各自支路的主开关互补导通，且主开关与相应的辅助开关在切换时留有足够的死区时间。In order to simplify the analysis process, it is assumed that: ① the inductor currents IL1 , IL2 , IL3 and IL4 are continuous; ② the capacitors C 0 ~ C 8 are large enough and the voltage on them remains unchanged; ③ all devices are ideal devices. The influence of parasitic parameters, etc. is not considered; ④ The resonance period between the clamping capacitor and the leakage inductance is much longer than the switch off time, and the voltage ripple on the clamping capacitor is ignored; ⑤ All active switches adopt an interleaved control strategy, and the switch occupies The air ratio D>0.5; ⑥ The auxiliary switches S TC1 , S TC2 , S TC3 , and S TC4 are complementary to the main switches of their respective branches, and there is sufficient dead time between the main switch and the corresponding auxiliary switch when switching.
根据功率开关状态的不同，在一个开关周期TS内可以将电路分为21种工作状态(由于其他输入相回路状态相同，这里只分析第一输入相的工作状态)：According to the different power switching states, the circuit can be divided into 21 working states within a switching cycle T S (since the other input phase loop states are the same, only the working state of the first input phase is analyzed here):
(1)状态1(t0～t1)。功率开关S1、S2均导通，此时输入电源通过功率开关S1、S2分别向电感L1、L2充电，IL1、IL2在输入电源Uin的激励下线性上升；变压器次级二极管D21、D31、D41、D11、D22、D32、D42、D0均关断，辅助开关VTC1、VTC2均关断，箝位电容CC1、CC2上的电压均保持不变，输出滤波电容CO独自向负载供电，输出电压uo下降。(1) State 1 (t 0 ~ t 1 ). The power switches S 1 and S 2 are both turned on. At this time, the input power charges the inductors L 1 and L 2 respectively through the power switches S 1 and S 2 . IL1 and IL2 rise linearly under the stimulation of the input power supply Uin; the transformer The stage diodes D 21 , D 31 , D 41 , D 11 , D 22 , D 32 , D 42 and D 0 are all turned off, the auxiliary switches V TC1 and V TC2 are all turned off, and the clamping capacitors C C1 and C C2 The voltages remain unchanged, the output filter capacitor C O supplies power to the load alone, and the output voltage u o drops.
(2)状态2(t1～t2)。在t1时刻功率开关S1的驱动信号关断，功率开关S2保持导通，电感电流IL2在输入电源的激励下继续线性上升；电感电流IL1向开关S1的漏源极电容CVT1充电，由于电容CVT1的存在，限制了开关S1漏源极电压的上升速度，可以有效降低开关S1的关断损耗；该过程持续到电容CVT1上的电压上升至uo/(8N)结束，其中n为变压器变比。(2) State 2 (t 1 ~ t 2 ). At time t 1 , the drive signal of power switch S 1 is turned off, power switch S 2 remains on, and the inductor current I L2 continues to rise linearly under the stimulation of the input power supply; the inductor current I L1 flows to the drain-source capacitance C of switch S 1 VT1 is charging. Due to the existence of capacitor C VT1 , the rise speed of the drain-source voltage of switch S 1 is limited, which can effectively reduce the turn-off loss of switch S 1 ; this process continues until the voltage on capacitor C VT1 rises to u o /( 8N) ends, where n is the transformer ratio.
(3)状态3(t2～t3)。在t2时刻开关S1漏源极电容CVT1上的电压上升至uo/(8N)，二极管D21、D22导通，变压器二次侧感应电流通过D21给电容C21充电，同时通过二极管D22给电容C22充电，电容C12放电。漏感电流ILK1开始上升，但由于漏感Lk1的存在，ILK1上升速度受限，因此二极管D21、D22实现了近似零电流导通。电感电流IL1继续为电容CVT1充电，该过程持续到电容CVT1上的电压上升至UCC1结束。由于电容CVT1非常小，所以从漏感电流开始上升到电容CVT1端电压为UCC1的过程很短，因此在电路性能分析时可以忽略该过程的影响，认为漏感电流ILk1上升的时刻与电容CVT1端电压被电容CC1箝位的时刻一致。(4)状态4(t3～t4)。在t3时刻电容CVT1端电压上升至UCC1，辅助开关STC1的体二极管导通，由于箝位电容CC1相对电容CVT1来说很大，因此大部分电感电流IL1流入箝位电容CC1中，开关管S1漏源极电压被箝位在UCC1，且从此刻开始漏感Lk1、箝位电容CC1以及变压器次级电容将会形成一个谐振电路，由于变压器次级电容设计时足够大，其电压纹波可以忽略，因此在分析其谐振过程时可以等效为一个恒定的电压源。这个谐振周期与漏感Lk1和箝位电容CC1的值有关(忽略电容CVT1的影响)，且谐振周期必须足够大，以保证电路的可靠工作。该谐振过程会持续到t4时刻(辅助开关STC1驱动信号到来)结束。(3) State 3 (t 2 ~ t 3 ). At time t 2 , the voltage on the drain-source capacitor C VT1 of the switch S 1 rises to u o /(8N), the diodes D 21 and D 22 are turned on, and the induced current on the secondary side of the transformer charges the capacitor C 21 through D 21. At the same time Capacitor C 22 is charged through diode D 22 and capacitor C 12 is discharged. The leakage inductance current I LK1 begins to rise, but due to the existence of the leakage inductance L k1 , the rising speed of I LK1 is limited, so the diodes D 21 and D 22 achieve approximately zero current conduction. The inductor current I L1 continues to charge the capacitor C VT1 , and this process continues until the voltage on the capacitor C VT1 rises to U CC1 . Since the capacitor C VT1 is very small, the process from when the leakage inductance current starts to rise to the voltage at the terminal of the capacitor C VT1 reaches U CC1 is very short. Therefore, the influence of this process can be ignored during circuit performance analysis. It is considered that the moment when the leakage inductance current I Lk1 rises It coincides with the moment when the voltage at the capacitor C VT1 is clamped by the capacitor C C1 . (4) State 4 (t3~t4). At time t3, the voltage at the capacitor C VT1 rises to U CC1 and the body diode of the auxiliary switch S TC1 is turned on. Since the clamping capacitor C C1 is large relative to the capacitor C VT1 , most of the inductor current I L1 flows into the clamping capacitor C. In C1 , the drain-source voltage of switch S1 is clamped at U CC1 , and from this moment on, the leakage inductance L k1 , the clamping capacitor C C1 and the secondary capacitance of the transformer will form a resonant circuit. Due to the design of the secondary capacitance of the transformer is large enough, its voltage ripple can be ignored, so it can be equivalent to a constant voltage source when analyzing its resonance process. This resonance period is related to the value of the leakage inductance L k1 and the clamping capacitor C C1 (ignoring the influence of the capacitor C VT1 ), and the resonance period must be large enough to ensure reliable operation of the circuit. This resonance process will continue until the end of time t 4 (the arrival of the auxiliary switch S TC1 driving signal).
(5)状态5(t4～t5)。在t4时刻辅助开关STC1的驱动信号到来，因其体二极管已提前导通，故辅助开关STC1实现零电压开通；该状态下漏感电流ILk1近似线性上升，该过程持续到ILk1上升至电感电流IL1时结束。(5) State 5 (t 4 ~ t 5 ). At time t 4 , the driving signal of auxiliary switch S TC1 arrives. Because the body diode has been turned on in advance, auxiliary switch S TC1 realizes zero-voltage turn-on; in this state, the leakage inductance current I Lk1 rises approximately linearly, and this process continues until I Lk1 It ends when it rises to the inductor current I L1 .
(6)状态6(t5～t6)。在t5时刻漏感电流ILk1上升至电感电流IL1，箝位电容电压uCC1停止上升并开始向漏感Lk1进行放电，漏感电流ILk1继续上升，该过程持续到辅助开关STC1关断时结束。(6) State 6 (t 5 ~ t 6 ). At time t 5 , the leakage inductance current I Lk1 rises to the inductor current I L1 , the clamping capacitor voltage u CC1 stops rising and begins to discharge to the leakage inductance L k1 , and the leakage inductance current I Lk1 continues to rise, and this process continues until the auxiliary switch S TC1 Ends at shutdown.
(7)状态7(t6～t7)。在t6时刻辅助开关STC1的驱动信号关闭，电容CVT1的存在限制了开关STC1端电压的上升速率，可以有效降低开关STC1的关断损耗，之后箝位电容CC1退出谐振电路，此时仅余开关S1漏源极电容CVT1独立向漏感Lk1谐振放电，该状态持续到电容CVT1上电压下降至uo/(8N)结束。(7) State 7 (t 6 ~ t 7 ). At time t 6 , the driving signal of the auxiliary switch S TC1 is turned off. The existence of the capacitor C VT1 limits the rising rate of the voltage at the switch S TC1 , which can effectively reduce the turn-off loss of the switch S TC1 . After that, the clamping capacitor C C1 exits the resonant circuit. At this time, only the drain-source capacitor C VT1 of the switch S 1 independently discharges resonantly to the leakage inductance L k1 . This state continues until the voltage on the capacitor C VT1 drops to uo/(8N).
(8)状态8(t7～t8)。在t7时刻电容CVT1上的电压下降至uo/(8N)，漏感Lk1端电压反向，漏感电流ILk1达到最大值并于此刻开始下降，电容CVT1通过漏感Lk1继续放电，该过程持续到电容CVT1上的电压下降至0。(8) State 8 (t 7 ~ t 8 ). At time t 7 , the voltage on the capacitor C VT1 drops to uo/(8N), the voltage at the leakage inductance L k1 reverses, the leakage inductance current I Lk1 reaches the maximum value and begins to decrease at this moment, and the capacitor C VT1 continues through the leakage inductance L k1 Discharge, this process continues until the voltage on the capacitor C VT1 drops to 0.
(9)状态9(t8～t9)。在t8时刻电容CVT1上电压下降至0，主开关S2的体二极管导通，漏感Lk1端电压为-uo/(8N)，漏感电流ILk1线性下降，电感电流IL1、IL2在输入电源uin的激励下线性上升；该过程持续到主开关S1的驱动信号开通时结束。(9) State 9 (t 8 ~ t 9 ). At time t 8 , the voltage on the capacitor C VT1 drops to 0, the body diode of the main switch S 2 is turned on, the voltage at the leakage inductance L k1 is -uo/(8N), the leakage inductance current I Lk1 decreases linearly, and the inductor current I L1 , I L2 rises linearly under the excitation of the input power supply u in ; this process continues until the drive signal of the main switch S 1 is turned on.
(10)状态10(t9～t10)。在t9时刻主开关S1的驱动信号开通，由于其体二极管已经导通，主开关S1实现了零电压开通，漏感电流ILk1继续线性下降，该过程持续到漏感电流ILk1下降至电感电流IL1时结束。(10) State 10 (t 9 ~ t 10 ). At time t 9 , the driving signal of the main switch S 1 is turned on. Since its body diode has been turned on, the main switch S 1 realizes zero-voltage turn-on, and the leakage inductance current I Lk1 continues to decrease linearly. This process continues until the leakage inductance current I Lk1 decreases. It ends when the inductor current I L1 is reached.
(11)状态11(t10～t11)。在t10时刻漏感电流ILk1下降至电感电流IL1，主开关S1的电流在此时反向，该过程持续到漏感电流ILk1下降至0时结束。变压器次级二极管D21、D22的电流也随之下降至0。值得注意的是受漏感电流ILk1下降速率的控制，二极管D21、D22的电流下降速率也得到了有效控制，实现了近似零电流关断，可以有效降低二极管的反向恢复损耗。在t10时刻之后，次级二极管D21、D31、D41、D11、D22、D32、D42、D0均反向截止，主开关S1、S2均导通，电感电流IL1、IL2在输入电源uin的激励下线性上升，与状态1一致。(11) State 11 (t 10 ~ t 11 ). At time t 10 , the leakage inductance current I Lk1 drops to the inductor current IL1 , and the current of the main switch S1 is reversed at this time. This process continues until the leakage inductance current I Lk1 drops to 0 and ends. The currents of the transformer secondary diodes D 21 and D 22 also drop to 0. It is worth noting that controlled by the decreasing rate of leakage inductance current I Lk1 , the current decreasing rate of diodes D 21 and D 22 is also effectively controlled, achieving approximately zero current turn-off, which can effectively reduce the reverse recovery loss of the diode. After time t 10 , the secondary diodes D 21 , D 31 , D 41 , D 11 , D 22 , D 32 , D 42 , and D 0 are all reversely cutoff, the main switches S 1 and S 2 are all turned on, and the inductor current I L1 and I L2 rise linearly under the stimulation of the input power supply u in , consistent with state 1.
第二输入相中，主开关S2、辅助开关STC2的开关切换状态与主开关S1、辅助开关STC1的开关切换状态相似。第二输入相与第四输入相同时运行，状态一致。不再赘述。In the second input phase, the switching states of the main switch S 2 and the auxiliary switch S TC2 are similar to the switching states of the main switch S 1 and the auxiliary switch S TC1 . When the second input phase is the same as the fourth input phase, it operates and the states are consistent. No longer.
第三输入相与第一输入相同时运行，状态3时二极管D41、D42导通，变压器二次侧感应电流通过D41给电容C41充电，电容C31放电，同时通过二极管D42给电容C42充电，电容C32放电。The third input phase operates when the same as the first input. In state 3, diodes D 41 and D 42 are turned on. The induced current on the secondary side of the transformer charges capacitor C 41 through D 41 , and discharges capacitor C 31. At the same time, it passes through diode D 42 to Capacitor C 42 is charged and capacitor C 32 is discharged.
通过上述分析，可以看出该变换器实现了自动均流，且180°相移的并联交错控制方式通过四个输入电感分担输入电流，在实现高升压的同时能有效的减小元器件的电流应力，开关损耗。抑制了开关管的电压尖峰的同时实现了二极管零电流关断。Through the above analysis, it can be seen that the converter achieves automatic current sharing, and the parallel interleaved control method with 180° phase shift shares the input current through four input inductors, which can effectively reduce the cost of components while achieving high voltage boost. Current stress, switching losses. While suppressing the voltage spike of the switching tube, zero current turn-off of the diode is achieved.
仿真参数：所有开关频率f＝50kHz，变压器变比N＝1，主开关占空比D＝0.7，输入电压uin＝30V，输出电压u0接近800V，功率P0＝1200W。可以看出流过4个电感的电流相等，每个模块自动均流。实现开关管的零电压导通，二极管实现了零电流关断，并限制了其电压应力尖峰。Simulation parameters: all switching frequency f = 50kHz, transformer ratio N = 1, main switch duty cycle D = 0.7, input voltage u in = 30V, output voltage u 0 close to 800V, power P 0 = 1200W. It can be seen that the current flowing through the four inductors is equal, and each module automatically shares the current. Realizing zero-voltage conduction of the switching tube, the diode realizes zero-current turn-off and limits its voltage stress peak.
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| CN106849681A (en) * | 2017-04-11 | 2017-06-13 | 厦门大学 | A kind of high-gain isolated active clamping Sofe Switch DC DC converters |
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