CN103490608B - 电磁干扰发射抑制器 - Google Patents
电磁干扰发射抑制器 Download PDFInfo
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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
- H02M1/12—Arrangements for reducing harmonics from ac 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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- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4258—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a regulated and galvanically isolated DC output voltage
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
提出了一种电磁干扰发射抑制器,其通过将低频调制或抖动应用至开关电路的开关信号的反馈中,使能够经由将较高次谐波发射转化至低于150KHz的标准EMI带宽之下的频率范围来抑制由开关电路的高频开关产生的EMI。当开关电路的开关或较高次谐波产生元件接入主电源或从主电源汲取功率时,以仅应用低频调制的形式,通过使用不连续的调制用在开关电路的输出信号上最小的叠加的纹波来实现EMI抑制。
Description
相关申请的交叉引用
本专利申请要求于2012年6月11日提交,题名为“电磁干扰发射抑制器”的序列号为61/658,245的共同待决的美国临时申请在35U.S.C.119(e)下的优先权。本申请通过引用整体并入序列号为61/658,245的美国临时申请。
技术领域
本发明设计电源领域。更具体地,本申请涉及具有调制控制的功率转换器系统。
背景技术
每个连接于电力电源的电气设备都被要求不能污染或传输高频噪声给电源。电气设备允许的电气发射量由联邦通讯委员会(FCC)严格管制。由于较高运行频率允许电源组件尺寸减小并且允许成本的降低,常规的电源设计已迁移至使用较高运行频率。运行于较高频率的缺点在于增加了产生的较高次谐波或电磁干扰(EMI)。
降低EMI的常规方法致力于将开关电路的开关频率降低到由FCC制定的150KHz的标准EMI带宽限制之下。这种方案的缺点在于增加了电源中磁性组件的尺寸。其他降低EMI的方法仅仅增加额外的滤波器组件以降低不需要的频率谐波。该第二种方案的缺点在于增加了电源的重量、尺寸和成本。降低谐波或EMI的大尖峰的另一方案是使用缓冲电路。缓冲电路虽然有效降低EMI,却牺牲了功率转换器的效率。在又一方案中,通过使用采取离散谐波谱并将EMI散布在连续频率范围内的抖动(jitter)来降低EMI。常规系统通过将噪声注入转换器的栅极驱动或控制器来使用抖动。将噪声注入转换器的栅极驱动具有使输出电压信号失真的缺点。另外,将噪声直接注入栅极驱动仅仅将抖动应用至转换器开关信号的上升和下降沿。另外,由于抖动贯穿开关信号的周期是连续的、在放大器带宽外部、并且在开关电路的调节回路外部被注入,因此该抖动在开关电路的输出端导致不需要的高次纹波。相应的,通过连续将抖动直接注入至栅极驱动电路,常规功率转换器抑制了反馈回路的效率以及包括零电压开关和开关信号的采样的其他特征。
发明内容
一种EMI发射抑制系统、装置和方法,包括频率调制元件,当开关元件从主电源汲取功率时,频率调制元件调制开关元件的频率以便降低主电源上的EMI发射。当开关元件不从主电源汲取功率时频率调制元件停止调制以便降低负载上的纹波。因此,EMI发射抑制系统能够最小化主电源上的EMI发射,同时不在负载上输出超额的纹波。
附图说明
参考附图将描述若干实施例,其中相似的组件具有相似的附图标记。示例实施例旨在说明,而不是限制发明。附图包括以下图:
图1图示根据某些实施例的EMI抑制系统的功能框图。
图2图示根据某些实施例的EMI抑制系统的电路图。
具体实施方式
本申请的实施例针对EMI发射抑制系统、设备和方法。本领域的普通技术人员将会意识到EMI发射抑制系统、设备和方法的下列详细描述仅是示意性的,而不是为了以任何方式限制。EMI发射抑制系统、设备和方法的其他实施例将使得益于本公开的本领域技术人员很容易想起它们。
现将详细参考在附图中图示的EMI发射抑制系统、设备和方法的实施方式。贯穿附图和下列详细描述中,将使用相同的附图标记指代相同或相似的部件。为了清楚,并非所描述的实施方式的所有普通特征均被示出和描述。当然,将理解的是,在任何这种实际的实施方式的研发过程中,必须就特定的实施方式做出多种决定,以达成开发者的特定目标,诸如符合应用以及与商务有关的限制,并且这些具体的目标将从一个实施方式到另一个实施方式、并且从一个开发者到另一个开发者而变化。另外,将理解的是,这些开发工作可能是复杂的并且耗费时间的,但对于得益于本公开的本领域的普通技术人员这将仍然是工程的普通任务。
在此描述EMI发射抑制系统、设备和方法的实施例。EMI发射系统、设备和方法能够通过较高次谐波发射传输至低于150KHz的标准EMI带宽之下的频率范围来抑制由开关电路的高频开关产生的EMI。较高次谐波发射的传输是通过将低频调制或抖动应用至开关电路的开关信号的反馈上来实现的。另外,能够通过不连续调制用输出信号上最小的增加的纹波的来实现EMI抑制,不连续调制的形式为当开关或开关电路的较高次谐波产生元件接入主电源或从主电源汲取功率时仅应用低频调制。因此,当与主电源耦合时,应用低频调制以便影响开关电路的开关脉冲的上升和下降沿,从而充分地减小主电源上来自开关电路的EMI噪声。相反地,当没有接入主电源或从主电源汲取功率时,暂停低频调制以便充分地减小开关电路输出上的纹波。
图1图示了根据某些实施例的EMI抑制系统100的功能框图。如图1中所示,系统100包括电源102、开关元件104、输出电路106、反馈元件108和频率调制元件110。电源102与开关元件104耦合,开关元件104与输出电路106电气耦合。反馈元件108在负载106和频率调制元件110之间电气耦合,频率调制元件110与开关元件104电气耦合。可替换地,反馈元件108能够在输出电路106和开关元件104之间直接耦合,和/或频率调制元件110能够与开关元件104、反馈元件108或与两者电气耦合。
电源102可以包括诸如主线路或插头插座的AC电源。可替换地,电源102可以包括DC电源。开关元件104可以包括诸如反激转换器的功率转换器电路。可替换地,开关元件104可包括其他类型电路,该其他类型的电路包括开关元件或以别的方式产生EMI发射的电路。例如,开关元件104可以包括正向转换器、推挽转换器、半桥转换器、全桥转换器和/或其他本领域众所周知的开关模式电源的配置。频率调制元件110可以包括信号或时钟发生器。可替换地,频率调制元件110可以包括其他本领域众所周知的能够在信号中引入低频抖动的信号发生或调制元件。在某些实施例中,频率调制元件110能够与开关元件104、输出电路106和/或反馈元件108集成以形成单独的集成电路。可替换地,频率调制元件110可以包括能够与诸如开关元件、输出电路和/或反馈电路的一个或多个分开的电路耦合的独立的集成电路。因此,频率调制元件110能够提供的优势为频率调制元件110与现有的集成电路耦合以改善它们的EMI抑制特性。
在运行中,开关元件104周期性地与电源102耦合,或从电源102吸取功率,并且对耦合到输出电路106的负载供应所期望的输出电压/信号。反馈元件108检测输出电压Vout,或输出电压Vout的代表值,并且调整开关元件104的输出以便将输出电压Vout保持在期望的范围内,从而调节输出电压Vout。在某些实施例中,反馈元件108调整开关元件104的占空比以便控制输出电压Vout。频率调制元件110检测何时开关元件104从电源102吸取功率或与电源102耦合,并且将低频调制或抖动应用到从反馈元件108接收到的信号上,从而将由开关元件104导致的并暴露给电源102的EMI最小化。频率调制元件110还检测何时开关元件104没有从电源102吸取功率或没有直接耦合到电源102,并中止或停止将低频调制或抖动应用在开关元件信号上以最小化应用于负载的输出电压/信号上的纹波。在某些实施例中,频率调制元件110在开关元件104的反馈回路中完成检测和调制。因此,仅当开关元件104耦合到电源102时应用抖动,并且系统100可以最小化从开关元件104传输至电源102的EMI量,同时还可以最小化从频率调制元件110的抖动感应至输出电压/信号上的纹波量。
图2图示了根据某些实施例的EMI抑制系统200的示意图。该示意图与图1中的功能框图基本相似,除了于此描述的附加细节。然而,可以理解的是可替换的电路可以用于实施图1的功能框图。如图2所示,EMI抑制系统200包括电源202、开关元件204、输出电路206、反馈元件208和频率调制元件210。系统200被配置为接收AC电压信号并提供适于诸如笔记本电脑、手机和其他设备的众多低电压应用的调节的DC输出电压Vout。在某些实施例中,输出电压Vout可以在5-40V的范围内。可替换地,输出电压Vout可以小于5V或大于40V。在某些实施例中,系统200包括在单独的集成电路中。可替换地,抑制系统200的一个或多个组件可以为分开的集成电路从而系统200可由多个集成电路电气耦合在一起而形成。
电源202包括与整流器212电气耦合的AC电源功率信号,以产生与开关元件204和反馈元件208两者电气耦合的未调节的DC输入电压Vin。输出电路206包括二极管D1和电容器C1。可替换地,输出电路206可以包括其包含半波或全波整流器的输出整流器电路。反馈元件208提供代表输出电压Vout的反馈电压Vfb。频率调制元件210包括信号发生器或时钟发生器222和一个或多个缓冲器216。开关元件204包括变压器T1、晶体管218、一个或多个电阻器R1、R2、R3、控制器设备214、求和设备220以及一个或多个缓冲器216。可替换地,开关元件204的一个或多个求和设备220、控制器设备214和/或缓冲器216能够是频率调制元件210的一部分,而不是开关元件204的一部分。实际上,可以理解的是,电源202、开关元件204、输出电路206、反馈元件208和/或频率调制元件210中的一个或多个组件可以定位于或重叠在202-210其他元件中一个或多个之上。
变压器T1的第一端电气耦合在从电源202接收的输入电压Vin和晶体管218的漏极端之间。变压器T1的第二端跨二极管D1和输出电路206的电容器C1电气耦合。晶体管218的源极端电气耦合于反馈元件208和电阻器R3,电阻器R3电气耦合于地。控制器设备214的Q输出线通过一个或多个缓冲器216电气耦合于晶体管218的栅极端和频率调制元件210的信号发生器222的输入。控制器设备214的S输入线通过另一缓冲器216电气耦合于求和设备220的输出。求和设备220的输入电气耦合于反馈元件208、信号发生器222的输出以及位于电阻器R1和R2之间的参考电压节点Vref,电阻器R1和R2在输入电压Vin和地之间电气串联。求和设备220可以是比较器、误差放大器或其他在参考电压Vref和反馈电压Vfb之间调制差别或误差从而输出调制的误差信号的装置。在某些实施例中,变压器T1为反激变压器。可替换地,变压器T1可以是本领域众所周知的其他类型的变压器或负载隔离电路。在某些实施例中,信号发生器222以预定频率生成时钟信号,诸如在2.0至9.0KHz的范围内。可替换地,预定的频率可以小于2.0KHz,大于9.0KHz,或其他本领域众所周知的预定频率。在某些实施例中,晶体管218为诸如N型金属氧化物半导体场效应晶体管(MOSFET)的场效应晶体管。可替换地,晶体管218可以为本领域众所周知的其他类型的晶体管或开关电路。例如,开关元件204可以包括可变频率转换器,从而能够根据系统200的输出功率需求调整开关元件204的运行带宽。在某些实施例中,控制器设备214为SR-NOR锁存触发器。可替换地,控制器214可为本领域众所周知的能够调节晶体管218的运行占空比的其他类型触发器、脉宽调制电路或信号逻辑电路。
在运行中,开关元件204的控制器设备214的输出Q将开关控制信号或驱动信号输出至晶体管218的栅极端,从而导致晶体管218重复地导通和关断。当开关控制信号为高时,激活晶体管218的通道,导致来自电源202的电流将通过变压器T的初级绕组和晶体管218被汲取,通过反馈回路208并且通过电阻器R3接地。当控制信号为低时,停用晶体管218的通道,防止电流流动通过晶体管218和初级绕组P1,并且跨初级绕组P1的电压上升,并且功率被传输至输出电路206。求和设备220接收来自反馈元件208的反馈信号,并将反馈信号的反馈电压Vfb与参考电压Vref相比较以便产生被输入至控制器214的输入S的误差信号,并且调节开关控制信号的占空比从而维持期望的输出电压Vout。因此,开关元件204调节输出电压Vout。
当开关控制信号为高从而开关元件204接入电源202时,信号发生器222输出低频调制或抖动信号至求和设备220,从而误差信号被调制,并且调制的误差信号被输入至控制器设备214,从而根据低频调制/抖动信号调制相对应的开关控制信号。因此,由于开关控制信号的调制基本获取了在开关频率上的EMI尖峰,并且在频谱上减低和分散EMI尖峰,由开关元件204在电源202上导致的EMI充分降低。当开关控制信号为低从而开关元件204不再接入电源并且储存在变压器T1中的功率被传递至输出电路206时,误差信号不再用低频调制信号进行调制。在某些实施例中,信号发生器222仅当开关元件204接入电源202时生成低频调制信号。在其他的实施例中,信号发生器222持续生成低频调制信号,但是仅当开关元件204接入电源202时,低频调制信号才被求和设备220用于调制误差信号。由于选择性地调制误差信号,从而选择性地调制开关控制信号,由调制的开关控制信号导致的负载上的纹波也被最小化。相应的,EMI发射抑制系统200提供的优势为保持在电源202上污染的EMI的最大降少量同时也最小化在输出电路206上的纹波。
本文所描述的EMI发射抑制系统、设备和方法具有众多优势。具体地,系统通过开关元件,通过使用反馈回路中的低频调制来调制开关元件的频率从而最小化电源上的EMI发射输出。另外,系统通过使用仅当开关元件接入电源时才调制控制信号的不连续调制来最小化由低频调制导致的负载上的纹波输出。因此,本文所描述的EMI发射抑制器具有众多优势。
以上在调制用于调节输出电压的控制信号的方面描述了EMI发射抑制系统、设备和方法。可以理解的是EMI发射抑制系统、设备和方法可以替换地被应用于非调节的应用。这类可替换的应用可以包括或可以不包括反馈元件。调制信号可被应用至由开关元件使用的参考信号或其它信号以生成调制的控制信号。
本申请已按照结合细节的具体实施例进行了描述以助于理解EMI发射抑制系统、设备和方法的构造和运行的原理。在多个图中示出和描述的许多组件可以互换以实现需要的结果,并且应当理解本说明书也包含这些互换。同样地,本文对具体实施例和其细节的参考不旨在用以限制于此所附的权利要求书的范围。对于本领域技术人员来说,可在不背离本申请的精神和范围情况下对所选择的实施例做出改动。
Claims (21)
1.一种用于功率转换的装置,包括:
a.功率转换电路,被耦合至电源,并且被配置为用于输出调节的输出电压,其中所述功率转换电路包括被配置为选择性地从所述电源汲取功率的开关元件,其中当开关元件接通时,从所述电源汲取功率,并且当所述开关元件关断时,不从所述电源汲取功率;以及
b.控制器,耦合至所述开关元件,并且被配置为供应驱动信号至所述开关元件,其中当所述开关元件接通并且从所述电源汲取功率时根据低频调制信号调制所述驱动信号,并且当所述开关元件关断并且不从所述电源汲取功率时停止根据所述低频调制信号的调制。
2.根据权利要求1所述的装置,其中用所述低频调制信号调制的所述驱动信号充分地降低了对应于所述开关元件的开关的电磁干扰。
3.根据权利要求1所述的装置,进一步包括反馈元件,所述反馈元件被耦合至所述控制器并且被配置为对所述控制器提供代表输出电压的反馈电压。
4.一种用于转换由电源供应的功率并且供应调节的输出电压的功率转换器,所述功率转换器包括:
a.包括初级绕组和次级绕组的变压器,其中所述初级绕组耦合至所述电源;
b.耦合于所述次级绕组的输出电路,其中所述输出电路被配置为输出输出电压;
c.耦合于所述初级绕组的开关,其中当所述开关为开,从所述电源汲取功率,并且当所述开关为关,不从所述电源汲取功率;
d.被配置为生成低频调制信号的信号发生器;
e.被配置为供应代表在所述输出电路处的所述输出电压的反馈信号的反馈元件;
f.耦合于所述信号发生器和所述反馈元件的调制电路,其中所述调制电路被配置为接收所述低频调制信号,所述反馈信号,和参考信号作为输入,并且输出误差信号;以及
g.耦合于所述调制电路和所述开关的控制器电路,其中所述控制器电路被配置为接收所述误差信号并且生成用于驱动所述开关的驱动信号,进一步其中当所述开关接通并且从所述电源汲取功率时,使用所述低频调制信号调制所述误差信号,并且在所述开关关断并且没有从所述电源汲取功率时,不使用所述低频调制信号调制所述误差信号。
5.根据权利要求4所述的功率转换器,其中所述控制器电路被配置为使用由所述低频调制信号调制的所述误差信号生成所述驱动信号,从而充分地降低在所述开关的开关频率中的谐波分布。
6.根据权利要求4所述的功率转换器,其中所述调制电路包括求和电路。
7.根据权利要求4所述的功率转换器,其中所述调制电路包括误差放大器。
8.根据权利要求4所述的功率转换器,其中所述低频调制信号的频率在2-9Khz的范围内。
9.根据权利要求4所述的功率转换器,其中所述控制器电路被配置为生成用于控制所述开关的占空比的脉宽调制信号。
10.根据权利要求4所述的功率转换器,其中所述开关包括晶体管。
11.根据权利要求4所述的功率转换器,其中所述调制电路被配置为当没有从所述电源汲取功率时停止使用所述低频调制信号调制所述误差信号。
12.根据权利要求4所述的功率转换器,其中所述信号发生器被配置为当没有从所述电源汲取功率时停止生成所述低频调制信号。
13.一种用于转换由电源供应的功率并且供应调节的输出电压的功率转换器,所述功率转换器包括:
a.被配置为以预定频率生成低频调制信号的频率调制电路;
b.耦合至所述频率调制电路的求和电路,其中所述求和电路被配置为接收所述低频调制信号、参考信号和反馈信号,并且输出误差信号;
c.被配置为接收所述求和电路的所述误差信号并且生成驱动信号的控制器电路;
d.被配置为接收所述驱动信号的开关电路,其中当所述开关电路接通时,从所述电源汲取功率,并且当所述开关电路关断时,不从所述电源汲取功率,其中当所述开关电路接通并且从所述电源汲取功率时,使用所述低频调制信号调制所述误差信号,并且在所述开关电路关断并且没有从所述电源汲取功率时,不使用所述低频调制信号调制所述误差信号;以及
e.耦合于所述开关电路的输出电路,所述输出电路被配置为输出所述调节的电压信号,其中所述控制器电路使用所述调制的误差信号用以充分地降低所述开关电路的开关频率中的谐波分布。
14.根据权利要求13所述的功率转换器,其中所述预定频率包括在2-9Khz范围内的频率。
15.根据权利要求13所述的功率转换器,其中所述控制器电路被配置为生成用于控制所述开关电路的占空比的脉宽调制信号。
16.根据权利要求13所述的功率转换器,进一步包括被配置为供应所述反馈信号至所述求和电路的反馈元件,其中所述反馈信号代表在所述输出电路处的输出电压。
17.根据权利要求13所述的功率转换器,其中所述求和电路包括运算放大器。
18.根据权利要求13所述的功率转换器,其中所述开关电路包括晶体管。
19.根据权利要求13所述的功率转换器,其中所述频率调制电路包括信号发生器。
20.根据权利要求13所述的功率转换器,其中所述求和电路被配置为当所述开关电路没有从所述电源汲取功率时停止使用所述低频调制信号调制所述误差信号。
21.根据权利要求13所述的功率转换器,其中所述频率调制电路被配置为当所述开关电路没有从所述电源汲取功率时停止生成所述低频调制信号。
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US9203292B2 (en) | 2015-12-01 |
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