CN102064708A - 电流输入型并联谐振直/直变换器及方法 - Google Patents

电流输入型并联谐振直/直变换器及方法 Download PDF

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CN102064708A
CN102064708A CN2010102534984A CN201010253498A CN102064708A CN 102064708 A CN102064708 A CN 102064708A CN 2010102534984 A CN2010102534984 A CN 2010102534984A CN 201010253498 A CN201010253498 A CN 201010253498A CN 102064708 A CN102064708 A CN 102064708A
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CN102064708B (zh
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徐�明
孙巨禄
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FSP Powerland Technology Inc
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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
    • H02M3/337—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 in push-pull configuration
    • H02M3/3376—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 in push-pull configuration with automatic control of output voltage or current
    • 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
    • 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

Abstract

本发明公布了一种电流输入型并联谐振直/直变换器及方法，所述变换器包括逆变电路、谐振网络、变压器、全波整流电路和输出滤波电路，逆变电路串接谐振网络后分别接变压器原边绕组的两端，变压器副边绕组的一次绕组的同名端和变压器副边绕组的二次绕组的异名端分别接全波整流电路的输入端，全波整流电路的输出端和变压器副边绕组的中间端分别接输出滤波电路的输入端。所述方法，首先采用逆变电路将输入直流电压逆变为正负交变的方波电流；其次采用谐振网络将方波电流变换为正弦电流；然后采用变压器将正弦电流变换为正弦电压；最后，将正弦电压经过全波整流电路整流后，经输出滤波电路产生直流输出电压。本发明结构简单、工作稳定可靠。

Description

电流输入型并联谐振直/直变换器及方法
技术领域
本发明涉及一种电流输入型并联谐振直/直变换器及方法，属于谐振式DC/DC变换电路的技术领域。
背景技术
LLC谐振式DC/DC变换器因其简单而高效的特点正被广泛应用于许多功率电换电源中，比如计算机电源适配器。但是，其尚存的一些问题依然限制着或阻碍着在一些领域的应用，比如通信和服务器电源领域。这些问题包括：同步整流管(SR)的可靠驱动；输出电容上的大电流纹波；多机并联时的限流运行等。为了解决上述问题，IC芯片解决商和电源制造业正在投入大量的精力。例如，迄今为止，工业界还只能依赖于“智能驱动IC”来解决SR的驱动问题，但依然存在动态条件下的可靠工作问题。
发明内容
本发明目的是针对现有技术存在的缺陷提供一种电流输入型并联谐振直/直变换器及方法。
本发明为实现上述目的，采用如下技术方案：
本发明一种电流输入型并联谐振直/直变换器，包括逆变电路、谐振网络、变压器、全波整流电路和输出滤波电路，逆变电路串接谐振网络后分别接变压器原边绕组的两端，变压器副边绕组的一次绕组的同名端和变压器副边绕组的二次绕组的异名端分别接全波整流电路的输入端，全波整流电路的输出端和变压器副边绕组的中间端分别接输出滤波电路的输入端。
优选地，所述滤波电路包括输出滤波电感和输出滤波电容，滤波电感的一端接全波整流电路的输出端，滤波电感的另一端接输出滤波电容的一端，输出滤波电容的另一端接变压器副边绕组的中间端。
一种电流输入型并联谐振直/直变换方法，首先，采用逆变电路将输入直流电压逆变为正负交变的方波电流；其次，采用谐振网络将方波电流变换为正弦电流；然后，采用变压器将正弦电流变换为正弦电压；最后，将正弦电压经过全波整流电路整流后，经输出滤波电路产生直流输出电压。
本发明原边开关管和副边二极管(或SR)的电压为正弦半波。这将大大改善DC/DC电路的EMI性能。同时，由于输出滤波电感的引入，使得输出滤波电容的纹波电流大大减小。另外，副边同步整流管的驱动可以直接利用原边的PWM驱动信号，而无需像“智能驱动IC”那样去检测SR的电流来决定SR的开通和关断。从而避免了特殊工况下的误驱动问题。
附图说明
图1：本发明电路原理图；
图2：本发明仿真波形图。
具体实施方式
如图1所示，一种电流输入型并联谐振直/直变换器，包括逆变电路1、谐振网络2、变压器T、全波整流电路3和输出滤波电路4，逆变电路1串接谐振网络2后分别接变压器T原边绕组的两端，变压器T副边绕组的一次绕组的同名端和变压器T副边绕组的二次绕组的异名端分别接全波整流电路3的输入端，全波整流电路3的输出端和变压器T副边绕组的中间端分别接输出滤波电路4的输入端。
其中，所述滤波电路4包括输出滤波电感LO和输出滤波电容CO，滤波电感LO的一端接全波整流电路3的输出端，滤波电感LO的另一端接输出滤波电容CO的一端，输出滤波电容CO的另一端接变压器T副边绕组的中间端。
一种电流输入型并联谐振直/直变换方法，首先采用逆变电路1将输入直流电压逆变为正负交变的方波电流；其次采用谐振网络2将方波电流变换为正弦电流；然后采用变压器T将正弦电流变换为正弦电压；最后将正弦电压经过全波整流电路3整流后，经输出滤波电路4产生直流输出电压。
该电路的输入为一直流电流源。通过Q1～Q4的交替导通将该直流电流逆变为一正负交变的方波。该方波电流被用来激励后面的谐振网络L1-C1以及变压器及负载。由于谐振网络的作用，变压器的原边将产生一个与方波电流同频的正弦电压。该正弦电压经D1；D2整流后，经LO-CO滤波，产生直流输出电压。
如图2所示，Q1～Q4的开关频率被固定在L1-C1的谐振频率点。为了调节输出电压，可以通过前级调节直流输入电流源的幅值，或控制逆变输出电流(即谐振网络的激励电流)为准方波电流，通过占空比的调制调解准方波电流的死区时间，从而达到控制准方波电流的基波分量的目的。下图为开关占空比位50％情况下的仿真波形。Q1和Q4的驱动信号可以通过隔离传输直接驱动D1。Q2和Q3的驱动信号可以通过隔离传输直接驱动D2。

Claims (3)

1.一种电流输入型并联谐振直/直变换器，其特征在于包括逆变电路(1)、谐振网络(2)、变压器(T)、全波整流电路(3)和输出滤波电路(4)，逆变电路(1)串接谐振网络(2)后分别接变压器(T)原边绕组的两端，变压器(T)副边绕组的一次绕组的同名端和变压器(T)副边绕组的二次绕组的异名端分别接全波整流电路(3)的输入端，全波整流电路(3)的输出端和变压器(T)副边绕组的中间端分别接输出滤波电路(4)的输入端。
2.根据权利要求1所述的电流输入型并联谐振直/直变换器，其特征在于所述滤波电路(4)包括输出滤波电感(LO)和输出滤波电容(CO)，滤波电感(LO)的一端接全波整流电路(3)的输出端，滤波电感(LO)的另一端接输出滤波电容(CO)的一端，输出滤波电容(CO)的另一端接变压器(T)副边绕组的中间端。
3.一种电流输入型并联谐振直/直变换方法，其特征在于：首先，采用逆变电路(1)将输入直流电压逆变为正负交变的方波电流；其次，采用谐振网络(2)将方波电流变换为正弦电流；然后，采用变压器(T)将正弦电流变换为正弦电压；最后，将正弦电压经过全波整流电路(3)整流后，经输出滤波电路(4)产生直流输出电压。
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