CN107181412A - A kind of modified phase-shifted full-bridge converter circuit - Google Patents
A kind of modified phase-shifted full-bridge converter circuit Download PDFInfo
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- CN107181412A CN107181412A CN201710469514.5A CN201710469514A CN107181412A CN 107181412 A CN107181412 A CN 107181412A CN 201710469514 A CN201710469514 A CN 201710469514A CN 107181412 A CN107181412 A CN 107181412A
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from DC input or output
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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
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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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- Dc-Dc Converters (AREA)
Abstract
本发明公开了一种改进型移相全桥变换器电路，包括第一至第四MOSFET，第一、第二变压器，第一至第三电容，第一至第四二极管，电阻，电感。所述改进型移相全桥变换器电路可应用于各类移相全桥变换器，在增加了开关管实现软开关范围的同时，在整个开关周期内保持原边功率向二次侧传递，显著地抑制了整流桥寄生振荡，降低了输出电压纹波，实现了变换器的效率提升。
The invention discloses an improved phase-shifting full-bridge converter circuit, comprising first to fourth MOSFETs, first and second transformers, first to third capacitors, first to fourth diodes, resistors and inductors . The improved phase-shifted full-bridge converter circuit can be applied to various types of phase-shifted full-bridge converters. While increasing the switching tube to realize the soft switching range, the primary side power is kept transmitted to the secondary side during the entire switching cycle. The parasitic oscillation of the rectifier bridge is significantly suppressed, the output voltage ripple is reduced, and the efficiency of the converter is improved.
Description
技术领域technical field
本发明专利公开了一种改进型移相全桥变换器电路，涉及电力电子技术领域。The patent of the invention discloses an improved phase-shifting full-bridge converter circuit, which relates to the technical field of power electronics.
背景技术Background technique
随着电力电子技术的发展，开关电源的性能也在不断提高。为了实现电源的高频化、小型化、数字化的发展趋势，软开关技术已广泛地应用在开关电源领域，成为了电力电子领域的一个非常重要的研究方向。With the development of power electronics technology, the performance of switching power supply is also improving. In order to realize the development trend of high frequency, miniaturization and digitalization of power supply, soft switching technology has been widely used in the field of switching power supply, and has become a very important research direction in the field of power electronics.
传统的移相全桥软开关变换器具有结构简单、损耗小、控制方便、性能稳定等优点，这使得移相全桥变换器非常适合中高功率应用场合。然而，传统的移相全桥软开关变换器依然存在着一些问题，一是在轻载工作情况下，变换器无法实现系统的ZVS特性，从而导致系统效率降低，电磁干扰变高。二是变换器整流过程中的寄生振荡增加了器件的电压应力和输出电压纹波。三是在变换器的续流期间，导通损耗也显著增加。因此，无论从研究还是应用的角度，开发性能更优秀的移相全桥变换器，都具有重要的意义。The traditional phase-shifted full-bridge soft-switching converter has the advantages of simple structure, low loss, convenient control, and stable performance, which makes the phase-shifted full-bridge converter very suitable for medium and high power applications. However, there are still some problems in the traditional phase-shifted full-bridge soft-switching converter. First, the converter cannot realize the ZVS characteristic of the system under light-load operation conditions, resulting in lower system efficiency and higher electromagnetic interference. The second is that the parasitic oscillation in the rectification process of the converter increases the voltage stress of the device and the output voltage ripple. The third is that during the freewheeling period of the converter, the conduction loss also increases significantly. Therefore, it is of great significance to develop a phase-shifted full-bridge converter with better performance, no matter from the research or application point of view.
发明内容Contents of the invention
本发明专利所要解决的技术问题是：为克服现有技术中存在的不足，提供一种改进型移相全桥变换器电路，可以实现所有开关管的零电压开关，增加了变换器实现软开关技术的工作范围，同时抑制整流桥寄生振荡，显著降低了输出电压纹波，实现变换器的效率提升。The technical problem to be solved by the patent of the present invention is: in order to overcome the deficiencies in the prior art, provide an improved phase-shifted full-bridge converter circuit, which can realize zero-voltage switching of all switching tubes, and increase the converter to realize soft switching While suppressing the parasitic oscillation of the rectifier bridge, the output voltage ripple is significantly reduced, and the efficiency of the converter is improved.
本发明专利为解决上述技术问题采用以下技术方案：The patent of the present invention adopts the following technical solutions to solve the above-mentioned technical problems:
一种改进型移相全桥变换器电路，包括第一至第四MOSFET，第一、第二变压器，第一至第三电容，第一至第四二极管，电阻，电感，其中，An improved phase-shifting full-bridge converter circuit, comprising first to fourth MOSFETs, first and second transformers, first to third capacitors, first to fourth diodes, resistors, and inductors, wherein,
所述第一MOSFET的漏极分别与输入端正极、第二MOSFET的漏极相连接，第一MOSFET的源极分别与第三MOSFET的漏极、第一电容的一端相连接，第三MOSFET的源极分别与输入端负极、第一变压器的初级绕组的一端、第四MOSFET的源极相连接，第二MOSFET的源极分别与第四MOSFET的漏极、第二电容的一端相连接，第一电容的另一端与第二变压器的第一次级绕组的一端相连接，第二变压器的第一次级绕组的另一端与第二变压器的第二次级绕组的一端、第二变压器的初级绕组的一端相连接，第二变压器的初级绕组的另一端与第一变压器的初级绕组的另一端相连接，第二电容的另一端与第二变压器的第二次级绕组的另一端相连接，所述第一二极管的阴极与第二二极管的阴极、电感的一端相连接，第一二极管的阳极与第一变压器次级绕组的一端、第三二极管的阴极相连接，第二二极管的阳极与第一变压器次级绕组的另一端、第四二极管的阴极相连接，第三二极管的阳极与第四二极管的阳极、第三电容的一端、电阻的一端相连接并接地，电感的另一端与第三电容的另一端、电阻的另一端相连接。The drain of the first MOSFET is respectively connected to the anode of the input terminal and the drain of the second MOSFET, the source of the first MOSFET is respectively connected to the drain of the third MOSFET and one end of the first capacitor, and the third MOSFET The source is respectively connected to the negative pole of the input terminal, one end of the primary winding of the first transformer, and the source of the fourth MOSFET, and the source of the second MOSFET is respectively connected to the drain of the fourth MOSFET and one end of the second capacitor. The other end of a capacitor is connected to one end of the first secondary winding of the second transformer, the other end of the first secondary winding of the second transformer is connected to one end of the second secondary winding of the second transformer, and the primary One end of the winding is connected, the other end of the primary winding of the second transformer is connected with the other end of the primary winding of the first transformer, and the other end of the second capacitor is connected with the other end of the second secondary winding of the second transformer, The cathode of the first diode is connected with the cathode of the second diode and one end of the inductor, and the anode of the first diode is connected with one end of the secondary winding of the first transformer and the cathode of the third diode , the anode of the second diode is connected to the other end of the secondary winding of the first transformer and the cathode of the fourth diode, the anode of the third diode is connected to the anode of the fourth diode, and one end of the third capacitor One end of the resistor is connected to ground, and the other end of the inductor is connected to the other end of the third capacitor and the other end of the resistor.
本发明与现有技术相比的主要技术特点是：The main technical characteristics of the present invention compared with prior art are:
变换器具有较高的电压增益，有利于减少次级匝数、整流二极管电压应力。The converter has a higher voltage gain, which is beneficial to reduce the number of secondary turns and the voltage stress of the rectifier diode.
滞后臂电流峰值高于超前臂电流峰值，并且能根据占空比进行动态调整，实现了ZVS储存能量的自适应调整。此外，结电容彻底放电所需要的能量显著减小。因此，初级侧的开关管都能在宽范围内实现零电压开关。The current peak value of the lagging arm is higher than the peak value of the super-forearm current, and can be dynamically adjusted according to the duty cycle, realizing the adaptive adjustment of ZVS stored energy. In addition, the energy required to completely discharge the junction capacitance is significantly reduced. Therefore, the switching tubes on the primary side can realize zero-voltage switching in a wide range.
在整个开关周期内保持原边功率向二次侧传递的连续性，有效地降低了整流电压的振荡，解决了传统移相全桥变换器的环流问题。The continuity of the primary side power transmission to the secondary side is maintained during the entire switching cycle, which effectively reduces the oscillation of the rectified voltage and solves the circulating current problem of the traditional phase-shifted full-bridge converter.
附图说明Description of drawings
图1是本发明专利的电路连接示意图，其中：Q1、Q2、Q3、Q4分别为第一至第四MOSFET，C1、C2、C0分别为第一至第三电容，Tm、Taux分别为第一、第二变压器，np为第一变压器的初级绕组，ns为第一变压器的次级绕组，n3为第二变压器的初级绕组，n1为第二变压器的第一次级绕组，n2为第二变压器的第二次级绕组，Llk为Tm的漏感，Lm为Taux的励磁电感，Taux和Tm的变比分别是n1:n2:n3＝1:1:n和np:ns＝1:n，D1、D2、D3、D4分别为第一至第四二极管，R为电阻，L0为电感。Figure 1 is a schematic diagram of the circuit connection of the patent of the present invention, wherein: Q 1 , Q 2 , Q 3 , and Q 4 are respectively the first to fourth MOSFETs, C 1 , C 2 , and C 0 are respectively the first to third capacitors, T m , Taux are the first and second transformers respectively, n p is the primary winding of the first transformer, n s is the secondary winding of the first transformer, n 3 is the primary winding of the second transformer, n 1 is the second The first secondary winding of the transformer, n 2 is the second secondary winding of the second transformer, L lk is the leakage inductance of T m , L m is the excitation inductance of T aux , the transformation ratios of T aux and T m are n 1 :n 2 :n 3 =1:1:n and n p :n s =1:n, D 1 , D 2 , D 3 , D 4 are respectively the first to fourth diodes, R is a resistor, L 0 is the inductance.
图2是本发明的移相全桥变换器电路的主要工作波形示意图。FIG. 2 is a schematic diagram of main working waveforms of the phase-shifted full-bridge converter circuit of the present invention.
图3～8是本发明的移相全桥变换器的等效电路结构示意图。3-8 are schematic diagrams of the equivalent circuit structure of the phase-shifted full-bridge converter of the present invention.
具体实施方式detailed description
下面详细描述本发明专利的实施方式，所述实施方式的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施方式是示例性的，仅用于解释本发明专利，而不能解释为对本发明专利的限制。凡根据本发明主要技术方案的精神实质所做的修饰，都应涵盖在本发明的保护范围之内。Embodiments of the present invention patents are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are only used to explain the patent of the present invention, and cannot be construed as limiting the patent of the present invention. All modifications made according to the spirit of the main technical solutions of the present invention shall fall within the protection scope of the present invention.
下面结合附图对本发明专利的技术方案做进一步的详细说明：Below in conjunction with accompanying drawing, the technical scheme of the patent of the present invention is described in further detail:
一种改进型移相全桥变换器电路，包括第一至第四MOSFET，第一、第二变压器，第一至第三电容，第一至第四二极管，电阻，电感，其中，An improved phase-shifting full-bridge converter circuit, comprising first to fourth MOSFETs, first and second transformers, first to third capacitors, first to fourth diodes, resistors, and inductors, wherein,
所述第一MOSFET的漏极分别与输入端正极、第二MOSFET的漏极相连接，第一MOSFET的源极分别与第三MOSFET的漏极、第一电容的一端相连接，第三MOSFET的源极分别与输入端负极、第一变压器的初级绕组的一端、第四MOSFET的源极相连接，第二MOSFET的源极分别与第四MOSFET的漏极、第二电容的一端相连接，第一电容的另一端与第二变压器的第一次级绕组的一端相连接，第二变压器的第一次级绕组的另一端与第二变压器的第二次级绕组的一端、第二变压器的初级绕组的一端相连接，第二变压器的初级绕组的另一端与第一变压器的初级绕组的另一端相连接，第二电容的另一端与第二变压器的第二次级绕组的另一端相连接，所述第一二极管的阴极与第二二极管的阴极、电感的一端相连接，第一二极管的阳极与第一变压器次级绕组的一端、第三二极管的阴极相连接，第二二极管的阳极与第一变压器次级绕组的另一端、第四二极管的阴极相连接，第三二极管的阳极与第四二极管的阳极、第三电容的一端、电阻的一端相连接并接地，电感的另一端与第三电容的另一端、电阻的另一端相连接。The drain of the first MOSFET is respectively connected to the anode of the input terminal and the drain of the second MOSFET, the source of the first MOSFET is respectively connected to the drain of the third MOSFET and one end of the first capacitor, and the third MOSFET The source is respectively connected to the negative pole of the input terminal, one end of the primary winding of the first transformer, and the source of the fourth MOSFET, and the source of the second MOSFET is respectively connected to the drain of the fourth MOSFET and one end of the second capacitor. The other end of a capacitor is connected to one end of the first secondary winding of the second transformer, the other end of the first secondary winding of the second transformer is connected to one end of the second secondary winding of the second transformer, and the primary One end of the winding is connected, the other end of the primary winding of the second transformer is connected with the other end of the primary winding of the first transformer, and the other end of the second capacitor is connected with the other end of the second secondary winding of the second transformer, The cathode of the first diode is connected with the cathode of the second diode and one end of the inductor, and the anode of the first diode is connected with one end of the secondary winding of the first transformer and the cathode of the third diode , the anode of the second diode is connected to the other end of the secondary winding of the first transformer and the cathode of the fourth diode, the anode of the third diode is connected to the anode of the fourth diode, and one end of the third capacitor One end of the resistor is connected to ground, and the other end of the inductor is connected to the other end of the third capacitor and the other end of the resistor.
下面以附图1为主电路结构，结合附图2～8叙述本发明的具体工作原理。由附图2可知整个变换器在一个开关周期有12种开关模态，分别是[t0～t1]、[t1～t2]、[t2～t3]、[t3～t4]、[t4～t5]、[t5～t6]、[t6～t7]、[t7～t8]、[t8～t9]、[t9～t10]、[t10～t11]、[t11～t12](见附图2)，其中，[t0～t6]为前半周期，[t6～t12]为后半周期。下面对各开关模态的工作情况进行具体分析。Below with accompanying drawing 1 main circuit structure, in conjunction with accompanying drawing 2～8 narrate concrete working principle of the present invention. It can be seen from Figure 2 that the entire converter has 12 switching modes in one switching cycle, which are [t 0 ～t 1 ], [t 1 ～t 2 ], [t 2 ～t 3 ], [t 3 ～t 4 ], [t 4 ～t 5 ], [t 5 ～t 6 ], [t 6 ～t 7 ], [t 7 ～t 8 ], [t 8 ～t 9 ], [t 9 ～t 10 ] . _ _ _ _ _ _ _ The working conditions of each switch mode are analyzed in detail below.
在分析之前，作如下假设：1)所有器件均为理想器件；2)隔直电容C1、C2看作幅值为0.5Vin的恒压源；3)四个MOSFET的结电容均为Coss；4)忽略Tm的漏感Llk和Taux的励磁电感Lm；5)输出滤波电感L0看作恒流源。Before the analysis, make the following assumptions: 1) All devices are ideal devices; 2) DC blocking capacitors C 1 and C 2 are regarded as constant voltage sources with an amplitude of 0.5V in ; 3) The junction capacitances of the four MOSFETs are C oss ; 4) Neglect the leakage inductance L lk of T m and the exciting inductance L m of T aux ; 5) The output filter inductance L 0 is regarded as a constant current source.
开关模态1[t0～t1]Switch mode 1[t 0 ～t 1 ]
Q1、Q2、D1-D4导通。变压器Taux初级绕组上的电压为0，iLm达到反向最大值-Im。变压器Tm的初级绕组两端的电压为0.5Vin，流过的电流为nI0，整流电压为0.5nVin。Q 1 , Q 2 , D 1 -D 4 are turned on. The voltage on the primary winding of the transformer T aux is 0 and i Lm reaches the reverse maximum value -I m . The voltage across the primary winding of the transformer T m is 0.5V in , the current flowing through it is nI 0 , and the rectified voltage is 0.5nV in .
开关模态2[t1～t2]Switch mode 2[t 1 ～t 2 ]
在t1时刻，Q2关断。Q2、Q4的结电容通过恒流源ilea线性放电。超前臂电压vlea从Vin下降到零，同时vp从0.5Vin下降到0.5nVin，变压器Taux的励磁电感Lm两端的电压从零开始下降。At time t1 , Q2 turns off. The junction capacitances of Q 2 and Q 4 are linearly discharged through the constant current source i lea . The super forearm voltage v lea drops from V in to zero, at the same time v p drops from 0.5V in to 0.5nV in , and the voltage across the excitation inductance L m of the transformer T aux starts to drop from zero.
开关模态3[t2～t3]Switch mode 3[t 2 ～t 3 ]
在t2时刻，vlea下降到零，Q4的寄生二极管正向偏置，Q4零电压导通。vp和vrec分别保持为0.5nVin和0.5n2Vin。因此，在模态3的持续期间内，原边功率保持向二次侧传递。Lm两端的电压保持在-Vin，iLm从-Im增加到+Im。At t2 moment, V lea drops to zero, the parasitic diode of Q 4 is forward biased, and Q 4 turns on with zero voltage. v p and v rec are kept at 0.5nV in and 0.5n 2 V in respectively. Therefore, during the duration of mode 3, the primary side power keeps transferring to the secondary side. The voltage across L m remains at -V in , and i Lm increases from -I m to +I m .
开关模态4[t3～t4]Switch mode 4[t 3 ～t 4 ]
在t3时刻，Q1关断。此时，iLm上升到正向最大值+Im。输出滤波电感等效到初级侧，因此，电流保持恒定。Q1、Q3的结电容通过恒流源ilag线性放电。vlag、vp开始下降，当vp下降到零，模态4结束。At time t3 , Q1 turns off. At this time, i Lm rises to the positive maximum value +I m . The output filter inductor is equivalent to the primary side, therefore, the current remains constant. The junction capacitances of Q 1 and Q 3 are discharged linearly through the constant current source i lag . v lag and v p start to drop, when v p drops to zero, mode 4 ends.
开关模态5[t4～t5]Switch mode 5[t 4 ～t 5 ]
在t4时刻，vp下降到零，滞后臂中点电压vlag为Vin/(1+n)，整流侧电压跌落为零，所有整流二极管同时导通。变压器Tm的初级绕组和次级绕组两端的电压均为零。初级侧结电容与漏感发生谐振。At time t 4 , v p drops to zero, the midpoint voltage v lag of the lagging arm is V in /(1+n), the voltage on the rectifier side drops to zero, and all rectifier diodes are turned on at the same time. The voltage across the primary and secondary windings of the transformer Tm is zero. The primary side junction capacitance resonates with the leakage inductance.
开关模态6[t5～t6]Switch mode 6[t 5 ～t 6 ]
在t5时刻，vlag下降到零。Q3的体二极管导通，Q3能够零电压导通。整流二极管保持导通，vAB保持为零。Llk两端的电压为-0.5Vin，使ip线性下降。在t6时刻，ip达到-nI0，同时D1、D4关断，D2、D3保持导通，Lm两端的电压为零，iLm达到正向最大值。 At time t5, v lag drops to zero. The body diode of Q3 conducts, and Q3 is able to turn on with zero voltage. The rectifier diode remains on and v AB remains zero. The voltage across L lk is -0.5V in , making i p drop linearly. At time t 6 , i p reaches -nI 0 , at the same time D 1 and D 4 are turned off, D 2 and D 3 are kept on, the voltage across L m is zero, and i Lm reaches the positive maximum value.
后半周期[t6～t12]的工作原理与前半周期[t0～t6]基本相同，只是电流、电压反方向变化，因此不再多述。The working principle of the second half period [t 6 ～t 12 ] is basically the same as that of the first half period [t 0 ～t 6 ], except that the current and voltage change in the opposite direction, so it will not be described further.
由以上描述可知，本发明提出的改进型移相全桥变换器具有如下优点：It can be seen from the above description that the improved phase-shifted full-bridge converter proposed by the present invention has the following advantages:
变换器具有较高的电压增益，有利于减少次级匝数、整流二极管电压应力。The converter has a higher voltage gain, which is beneficial to reduce the number of secondary turns and the voltage stress of the rectifier diode.
滞后臂电流峰值高于超前臂电流峰值，并且能根据占空比进行动态调整，实现了ZVS储存能量的自适应调整。此外，结电容彻底放电所需要的能量显著减小。因此，初级侧的开关管都能在宽范围内实现零电压开关。The current peak value of the lagging arm is higher than the peak value of the super-forearm current, and can be dynamically adjusted according to the duty cycle, realizing the adaptive adjustment of ZVS stored energy. In addition, the energy required to completely discharge the junction capacitance is significantly reduced. Therefore, the switching tubes on the primary side can realize zero-voltage switching in a wide range.
在整个开关周期内保持原边功率向二次侧传递的连续性，有效地减小了电感电流纹波和整流电压的振荡，解决了常规移相全桥变换器存在的环流问题。During the whole switching cycle, the continuity of the power transmission from the primary side to the secondary side is maintained, which effectively reduces the ripple of the inductor current and the oscillation of the rectified voltage, and solves the problem of circulating current in the conventional phase-shifted full-bridge converter.
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| CN108964475A (en) * | 2018-08-16 | 2018-12-07 | 汕头大学 | A kind of novel Zero-voltage switch full-bridge direct current converter |
| CN109842182A (en) * | 2019-01-08 | 2019-06-04 | 上海瞻芯电子科技有限公司 | Power supply system |
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