CN1930925A - 利用太阳能电池的灯驱动器 - Google Patents
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Abstract
一种能够驱动气体放电灯(L)的太阳能供电的灯驱动器(100、200)包括:半桥逆变器(130),其包括:串联耦合在第一参考节点(V1)和第二参考节点(mass)之间的两个可控开关(131、132)的第一支路;串联耦合在所述第一参考节点(V1)和所述第二参考节点(mass)之间的两个缓冲电容器(133、134)的第二支路;连接在一方面在所述两个可控开关(131、132)之间的第一节点(D)与另一方面在所述两个缓冲电容器(133、134)之间的第二节点(E)之间的输出支路(DE);升压转换器(110),具有直接连接到所述两个可控开关(131、132)之间的所述第一节点(D)上的输出(115)。
Description
技术领域
本发明通常涉及能够驱动气体放电灯,具体为高频气体放电灯,更具体地为高频TL灯的灯驱动器。更具体地,本发明涉及能够通过太阳能电池供电的灯驱动器。
背景技术
气体放电灯一般是公知的。通常,它们包括以气密方式密封住放电室的发光管、电离填充物和一对彼此相对位于放电室内的电极,每个电极连接到相关的导电体,这些导电体通过灯管从放电室延迟到外部。工作中,电压施加到所述电极上,在所述电极之间形成气体放电,导致灯电流在电极之间流动。
放电灯典型地是由电子镇流器或提供交流电的驱动器来驱动的。已经分别开发出灯驱动器和太阳能供电设备。典型地,灯驱动器被开发成用于从电力网供电,并包括:
-输入,用于接收交流电源;
-整流器,用于将电源电压整流成直流电压;
-直流/直流升压转换器,用于接收整流后的电压,并用于将该电压转换成更高的电压,通常也用于执行对电源电流的功率因数校正;
-半桥逆变器,用于将所述高直流电压逆变成具有适当幅值的交流电(灯电流)。
逆变器起电流源的作用。典型地,逆变器在大约40-50kHz的数量级工作。因此,原则上,灯工作时的灯电流具有恒定的幅值,但会以对称方式在非常短的时间(整流周期)内规律地改变其方向,即,在每个电流周期的50%的时间内电极作为阴极工作,而在每个电流周期的另外50%的时间内电极作为阳极工作。
另一方面,能够接收太阳能并产生输出电压的典型的太阳能电压源包括:
-至少一个光生伏打电池,能够接收光并产生输出电流;
-升压转换器,接收来自于光生伏打电池的输出电流,并产生输出电压。
典型地,由太阳能电压源提供的电能被用来对电池或其它类型的蓄电池(例如,电力网的输电线路)进行充电,并且电池被用来作为用于电气设备的电源。
在灯驱动器中,希望能够直接使用太阳能来驱动放电灯。因此,已经开发出太阳能供电灯驱动器,其组合了典型的太阳能电压源的各个部件和典型的放电灯驱动器的各个部件。图1是示意性地示出现有技术中的太阳能供电灯驱动器1的方框图,其包括三级,即,升压转换器10、脉宽调制逆变器20和半桥逆变器30。
升压转换器10包括至少一个光生伏打电池11、一端耦合到光生伏打电池11输出端的电感器12、耦合在电感器12的第二端和参考电压(mass)之间的可控开关13和整流元件14,该整流元件14的一端耦合到所述电感器12和所述开关13之间的节点A,另一端耦合到升压转换器10的输出端15。
脉宽调制逆变器20包括具有两个可控开关21和22的第一支路,这两个开关串联耦合在所述升压转换器输出端15和所述参考电压(mass)之间;所述两个可控开关21和22之间的节点被标记为B。该脉宽调制逆变器20包括具有两个可控开关23和24的第二支路,这两个开关串联耦合在所述升压转换器输出端15和所述参考电压(mass)之间;所述两个可控开关23和24之间的节点被标记为C。
半桥逆变器30包括具有两个可控开关31和32的第三支路,这两个开关串联耦合在所述升压转换器输出端15和所述参考电压(mass)之间;所述两个可控开关31和32之间的节点被标记为D。半桥逆变器30包括具有两个电容器33和34的第四支路,这两个电容器串联耦合在所述升压转换器输出端15和所述参考电压(mass)之间;所述两个电容器33和34之间的节点被标记为E。半桥逆变器30还包括灯L、电容器35和电感器36的设置,这三个元件串联耦合在逆变器30的所述两个节点D和E之间。
脉宽调制逆变器20还包括电感器25,其与交流电力网输入/输出36串联耦合在逆变器20的所述两个节点B和C之间。如果太阳能不够用,就会从交流电力网接收能量来给灯L供电。如果可利用的太阳能多于灯L消耗的能量,则剩余的能量被反馈到电力网。
典型地由MOSFET实现的所述开关是由开关控制器来驱动的,为了简明起见,图1中没有示出该开关控制器。
现有技术中的这种太阳能供电的灯驱动器1具有几个缺点。该设备具有大量元件,即,至少具有7个开关并至少具有3个电感器。此外,因为有三个转换级,所以从光生伏打电池11到灯L有相当多的能量损耗。
本发明的主要目的是减少这些缺点。更具体地,本发明的目的是提供一种具有减少了的元件数量以及提高的效率的太阳能供电的灯驱动器。
发明内容
根据本发明的主要方面,升压转换器的输出直接连接到半桥逆变器/转换器的两个可控开关之间的节点上,电力网输入/输出并联连接到灯和串联电感器的串联设置上,这样,允许完全省略掉脉宽调制逆变器级,而同时允许维持驱动器的性能。
附图说明
将参考附图通过接下来的描述进一步解释本发明的这些和其它方面、特征和优点,附图中相同的附图标记表示相同或相近的部件,在附图中:
图1是示意性地示出现有技术中的太阳能供电的灯驱动器的通常设计的方框图;
图2是示意性地示出根据本发明的太阳能供电的灯驱动器的第一实施例的通常设计的方框图;
图3是示意性地示出根据本发明的太阳能供电的灯驱动器的第二实施例的通常设计的方框图。
具体实施方式
图2示意性地示出了根据本发明的太阳能供电的灯驱动器100的第一实施例的方框图,其包括升压级110和半桥逆变器130。
升压转换器110包括至少一个光生伏打电池111,电感器112,该电感器112的一端耦合到光生伏打电池111的输出端,其另一端耦合到整流元件114(用二极管来表示)的第一端(在这种情况下为阳极),该整流元件114的一端(在这种情况下为阴极)耦合到升压转换器110的输出端115。
半桥逆变器130包括具有两个可控开关131和132的第一支路,这两个开关串联耦合在第一参考电压V1和第二参考电压(mass)之间;所述两个可控开关131和132之间的节点被标记为D。半桥逆变器130包括具有两个缓冲电容器133和134的第二支路,这两个电容器串联耦合在所述第一参考电压V1和所述第二参考电压(mass)之间;所述两个电容器133和134之间的节点被标记为E。半桥逆变器130还包括连接在逆变器130的所述两个节点D和E之间的输出支路DE。在所示的实施例中,输出支路DE包括串联耦合在逆变器130的所述两个节点D和E之间的灯L、电容器135和电感器136的设置。在这点上,注意,灯L实际上不是逆变器130的一部分;逆变器130包括用于接收灯L的灯输出,但对于本领域的技术人员会很清楚的这些细节没有在图2中说明。
由于参考电压V1不是由外部电源提供的,而是通过两个开关131和132的升压转换操作从电力网和/或从太阳能电池得到的,所以下文中第一开关131和第一缓冲电容器133之间的节点将被表示成“第一参考节点”。同样,下文中第二开关132和第二缓冲电容器134(mass)之间的节点将被表示成“第二参考节点”。
半桥逆变器130还包括电感器137,该电感器137与交流电力网输入/输出138串联耦合在逆变器130的所述两个节点D和E之间,即,并联到灯L、电容器135和电感器136的串联设置上。如果太阳能不够用,就会从交流电力网接收能量来给灯L供电。在这种情况下,开关作为倍压升压转换器来工作,其将能量存储在电容器133和134中。同时,这些开关作为从这些电容器133和134供电的逆变器来工作,传送能量到灯136。这两个能流可以用PWM和FM的混合独立地由驱动开关131和132来控制(给出必需的两个自由度)。如果可利用的太阳能多于由灯L消耗的能量,则剩余的能量被反馈到电力网138。
典型地由MOSFET实现的所述开关是由开关控制器140驱动的。
当将根据本发明的第一太阳能供电的灯驱动器100与如图1中所说明的现有技术中的驱动器1进行比较时,立即会很明显的是,本发明的驱动器100具有更少的元件,特别是具有更少的开关:只有两个开关,即,第一开关131和第二开关132,在本实施例中已经足够了。第一开关131执行上部逆变器开关(比较现有技术中的开关21和23)和上部半桥开关(比较现有技术中的开关31)的双重功能。第二开关132执行升压开关(比较现有技术中的开关13)、下部逆变器开关(比较现有技术中的开关22和24)和下部半桥开关(比较现有技术中的开关32)的三重功能。
开关控制器140产生用于控制两个开关131和132到它们的导通或不导通状态的控制信号,注意,如对于本领域的技术人员一般所公知的,这两个开关不同时导通。开关控制器140适用于用频率调制(FM)和脉宽调制(PWM)的组合来驱动这两个开关。更具体地,开关控制器140适用于将这两个开关131和132的开关频率设置成能够得到确定所需的灯电流,并将开关的占空比(即,开关的导通时间对整个开关周期的比率)设置成能够得到确定所需的电力网电流。优选地,这些开关被控制成在电源周期中能保持固定的开关频率。
这样选择开关131、132的开关频率以及去耦电容器135的阻抗,使得灯L不能直接由电力网138供电。典型地,电力网的频率在50-60Hz的数量级,开关的工作频率被选定成高于该电力网的频率,优选地是不低于20kHz。在灯L是高频TL灯的情况下,在40-50kHz数量级的工作频率是适当的。
通过选择电力网的频率和开关工作频率之间具有较大的差距,可以相对较容易地选择用于去耦电容器135的适当的值,使得其对于电力网的频率具有相对较大的阻抗,而对于开关工作频率具有相对较低的阻抗。这样会防止电力网电流直接流到灯L,同时允许灯L从缓冲电容器接收到高频电流。同样,可以相对较容易地选择用于与电力网138串联的电感器137的适当的值,使得其具有较大的阻抗,用以防止高频成分到达电力网。
图3示意性地示出了根据本发明的太阳能供电的灯驱动器200的第二实施例,其基本上与第一实施例100相同,只是升压级110增加了附加开关113,其连接在一方面在电感器112和整流元件114之间的节点A与另一方面的第二参考节点(mass)之间。该附加开关113的功能相应于现有技术中驱动器1的升压转换器10中的开关13。
当设计灯驱动器时,有三个在理论上应同时被优化的重要性能参数:
1a-如果没有可用的太阳能或太阳能不够用(例如在夜间)且驱动器消耗来自电力网的能量时的电力质量;理想的是,电力质量包含值为1的功率因数和小于30%的总谐波失真;
1b-在太阳能过剩的情况下(即,更多的日光和/或很少或没有灯功率消耗)提供给电力网的电力的电力质量;
2-恒定的灯功率,即,无纹波且无闪烁的灯输出;
3-最大功率点跟踪,即,设置成始终从太阳能电池得到最大的功率。
在如图1中所说明的现有技术中的驱动器1中,其包括三个被独立驱动的单独的转换器级,升压转换器级10的设置被优化成满足第三个参数(最大功率点跟踪)的要求,半桥级30的设置被优化成满足第二个参数(无纹波且无闪烁的灯输出)的要求,逆变器级20的设置被优化成满足第一个参数(电力质量)的要求。
在图3的实施例中,其包括基本上可以被单独控制的三个开关,其可以单独地优化所有这三个所述的参数。在图2的实施例中,其优点在于,它只包括两个开关,这看起来只有两个所述的参数可以被单独地优化。但是,在图2中,可以一起改变这两个开关的开关频率,并单独地改变每个开关的占空比。平均占空比控制电力网的电流,而占空比之差可以改变地控制两个缓冲电容器133、134上的电压平衡。该电压平衡影响下部开关的必需的占空比和频率,这样间接地影响了最大功率点跟踪。
对本领域的技术人员应很清楚的是,本发明并不局限于上面所讨论的示例性实施例,而是在如所附的权利要求中所限定的本发明的保护范围内各种改变和修改都是可以的。
例如,与灯L、电容器135和电感器136的串联设置并联地,或取代该串联设置,可以连接驱动整流器的变压器,使得根据本发明的驱动器100、200还可以提供电池充电器输出。
Claims (14)
1、能够驱动气体放电灯(L)的太阳能供电的灯驱动器(100、200),包括:
-半桥逆变器(130),其包括:
--串联耦合在第一参考节点(V1)和第二参考节点(mass)之间的两个可控开关(131、132)的第一支路;
--串联耦合在所述第一参考节点(V1)和所述第二参考节点(mass)之间的两个缓冲电容器(133、134)的第二支路;
--连接在一方面在所述两个可控开关(131、132)之间的第一节点(D)与另一方面在所述两个缓冲电容器(133、134)之间的第二节点(E)之间的输出支路(DE);
-升压转换器(110),具有直接连接到所述两个可控开关(131、132)之间的所述第一节点(D)上的输出(115)。
2、根据权利要求1的驱动器,其中,输出支路(DE)包括灯(L)输出、去耦电容器(135)和电感器(136)的串联设置。
3、根据权利要求1的驱动器,其中,输出支路(DE)包括电感器(137)和交流电力网输入/输出(138)的串联设置。
4、根据权利要求1的驱动器,其中,输出支路(DE)包括灯(L)输出、去耦电容器(135)和电感器(136)的第一串联设置,还包括电感器(137)和交流电力网输入/输出(138)的第二串联设置,所述第二串联设置并联连接到所述第一串联设置。
5、根据权利要求4的驱动器,其中,开关控制器(140)适用于以高于电力网频率的开关频率驱动所述两个开关(131、132),优选地以不低于20kHz的开关频率,更优选地以40-50kHz数量级的开关频率。
6、根据权利要求5的驱动器,其中,所述去耦电容器(135)对于电力网频率具有相对较大的阻抗,并且对于开关工作频率具有相对较低的阻抗。
7、根据权利要求5的驱动器,其中,所述电感器(137)对于开关工作频率具有相对较大的阻抗,并且对于电力网频率具有相对较低的阻抗。
8、根据权利要求1的驱动器,其中,输出支路(DE)包括驱动整流器的变压器。
9、根据权利要求1的驱动器,还包括开关控制器(140),适用于产生用于控制所述两个开关(131、132)到它们的导通或不导通状态的控制信号,该开关控制器(140)适用于用频率调制(FM)和脉宽调制(PWM)的组合来驱动所述两个开关。
10、根据权利要求9的驱动器,其中,开关控制器(140)适用于设置该两个开关(131、132)的开关频率,使得获得确定所需的灯电流,并适用于设置开关的占空比,使得获得确定所需的电力网电流。
11、根据权利要求10的驱动器,其中,开关控制器(140)适用于维持固定的开关频率。
12、根据权利要求10的驱动器,其中,开关控制器(140)适用于设置用于该两个开关(131、132)的共用开关频率,并适用于设置用于该两个开关(131、132)的各自的占空比。
13、根据权利要求1的驱动器,其中,升压转换器(110)包括至少一个光生伏打电池(111),一端耦合到光生伏打电池(111)的输出端而另一端耦合到整流元件(114)的第一端的升压电感器(112),其中该整流元件具有耦合到升压转换器(110)的输出(115)的输出端。
14、根据权利要求13的驱动器,其中,升压转换器(110)还包括附加可控开关(113),该附加可控开关连接在一方面在升压电感器(112)和整流元件(114)之间的节点A与另一方面的第二参考节点(mass)之间。
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US11177663B2 (en) | 2016-04-05 | 2021-11-16 | Solaredge Technologies Ltd. | Chain of power devices |
Also Published As
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ATE407543T1 (de) | 2008-09-15 |
EP1728413B1 (en) | 2008-09-03 |
US20070138970A1 (en) | 2007-06-21 |
WO2005089030A1 (en) | 2005-09-22 |
EP1728413A1 (en) | 2006-12-06 |
DE602005009510D1 (de) | 2008-10-16 |
JP2007526608A (ja) | 2007-09-13 |
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