CN1362655A - 太阳能充电系统 - Google Patents
太阳能充电系统 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/1563—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators without using an external clock
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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
- H02M3/005—Conversion of dc power input into dc power output using Cuk converters
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
本发明提供了一种太阳能充电系统,包括:电压转换器,用于将太阳能电池所产生的原始电压的电压电平转换成充电电压,并利用此充电电压对电容进行充电;以及与电压转换器电连接的占空比控制电路,用于向电压转换器提供驱动时钟,以使电压转换器根据此驱动时钟进行操作。其中,占空比控制电路根据取决于太阳能电池所产生的原始电压的最大充电功率来调整驱动时钟的占空比。
Description
发明领域
本发明涉及一种太阳能充电系统,更具体地说,它涉及一种能够将从太阳能电池产生的电能高效地充入双层电容的太阳能充电系统。
现有技术说明
先进的电能系统一般都集成了含有太阳能电池和双层电容的太阳能充电系统,从而可使电能在白天产生并在夜晚消耗以适应环境及能量方面的需求。例如,在日本未决专利公报No.10-66281中就揭示出了这样一种太阳能系统。对太阳能充电系统来说,提高向电容供应已产生的能量的效率是非常重要的。
图1A的框图显示了一种含有一传统太阳能充电系统的电能系统。图1B的框图显示出了图1A中所示的传统太阳能充电系统。该传统电能系统在日本未决专利公报No.9-292851中也得到了说明。传统的太阳能充电系统70包括:太阳能电池71,整流器72(如二极管),第一DC-DC转换器73,以及双层电容74。该传统的太阳能充电系统70被连接至一个第二DC-DC转换器75。第二DC-DC转换器75与一指示器76相连。该太阳能充电系统70可保存电能。第二DC-DC转换器75接收到来自太阳能充电系统70的电能,并对其电压进行转换。具有已被转换的电压的电能被提供给指示器76以指示出电能的转换电压电平。
参考图1B,电源电压从太阳能电池71通过整流器72被提供给第一DC-DC转换器73。太阳能电池71所产生的电源电压根据日光条件而发生变化。第一DC-DC转换器73将可变的电源电压转换成预定的恒定电压电平。然后,具有预定恒定电压电平的电能被从第一DC-DC转换器73提供至双层电容74,从而使双层电容74以预定的恒定电压电平进行充电。
从理论上讲,以恒定电压电平对电容进行充电意味着太阳能电池所产生的电能约有一半可被充入电容。这就意味着,只要电容是以恒定电压电平被充电的,则电容的充电效率就会较低。
太阳能电池根据所产生的可变电源电压电平而具有一个最大功率条件。此最大功率条件取决于太阳能电池输出的电压和电流之间的关系。以预定的恒定电压电平对电容进行充电的方法不能满足该最大功率条件。
在上述情况中,需要开发出一种能够解决上述问题的新颖的太阳能充电系统。
发明概述
因此,本发明的一个目的是提供一种避免上述问题的新颖的太阳能充电系统。
本发明还有一个目的是提供一种能够在最大功率条件下对电容进行充电的新颖的太阳能充电系统。
本发明所提供的一种太阳能充电系统包括:电压转换器,它用于将太阳能电池所产生的原始电压的电压电平转换成充电电压,并可利用此充电电压对电容进行充电;以及与电压转换器电连接的占空比控制电路,它用于向电压转换器提供一驱动时钟,以使电压转换器根据此驱动时钟进行操作。其中,占空比控制电路可根据一个取决于太阳能电池所产生的原始电压的最大充电功率来调整驱动时钟的占空比。
通过以下的文字说明,本发明的上述及其它目的、特征和优点将变得更加明了。
附图的简要说明
以下将参考附图对根据本发明所述的各优选实施例进行详细说明,在附图中:
图1A的框图显示了一个含有传统太阳能充电系统的电源系统。
图1B的框图显示出了图1A所示的传统太阳能充电系统。
图2的框图显示了在本发明第一实施例中所述的一种新颖的太阳能充电系统。
图3的电路图显示了包含在图2所示太阳能充电系统之中的电压转换器电路的内部电路结构。
图4的时序图显示了图3所示电压转换器电路的驱动时钟信号、节点Na上的电压、电流I1和I3以及电压Vc2的波形。
图5的电路图显示了图2所示太阳能充电系统中所含有的占空比控制电路的内部电路结构。
图6显示出了太阳能电池的电压-电流特性曲线。
图7显示了在最大功率条件下功率随照度的变化。
图8的电路图显示了在根据本发明第二实施例所述太阳能充电系统中含有的其它电压转换器电路的内部电路结构。
优选实施例的详细说明
根据本发明第一个方面所述的一种太阳能充电系统包括:电压转换器,它用于将太阳能电池所产生的原始电压的电压电平转换成一个充电电压,并可利用此充电电压对电容进行充电;以及与电压转换器电连接的占空比控制电路,它用于向电压转换器提供一驱动时钟,以使电压转换器根据此驱动时钟进行操作。其中,占空比控制电路可根据一个取决于太阳能电池所产生的原始电压的最大充电功率,来调整驱动时钟的占空比。
驱动时钟的占空比根据由所产生的电压决定的最大充电功率而受到控制,由此,就能以太阳能电池的最大输出对电容进行充电,其中,最大输出可根据日光条件而相应改变。
最好,电压转换器电路能够产生一检测电压,并且占空比控制电路可接收一检测电压,而且除最大充电功率以外,占空比控制电路还可根据该检测的电压对占空比进行调整。
占空比控制电路还最好能够根据一个预设的拟合线来调整占空比,该拟合线是通过参考太阳能电池的最大充电功率的电压-电流特性曲线而被拟合出来的。
电压转换器电路最好还能提升太阳能电池所产生的原始电压的电压电平。
电压转换器电路最好既能提升又能降低太阳能电池所产生的原始电压的电压电平。
电容器最好由双层电容构成。第一实施例
以下将参考图2对本发明的第一实施例进行详细说明。图2的框图显示了在本发明第一实施例中的一种新颖的太阳能充电系统。
该太阳能充电系统包括:太阳能电池1,电压转换器电路2,双层电容3以及占空比控制电路4。太阳能电池1根据接收到的入射光或日光而产生一个生成电压101。太阳能电池1与电压转换器电路2的功率输入端21电连接,以用于将生成的电压101提供给电压转换器电路2。太阳能电池1与占空比控制电路4的功率输入端31电连接,以用于将生成的电压101提供给占空比控制电路4。
输入至电压转换器电路2的电流远远大于输入至占空比控制电路.4的电流。太阳能电池1所生成的电能主要是由电压转换器电路2消耗的,其剩余部分则由占空比控制电路4消耗。
电压转换器电路2含有一个检测电压输出端24。电压转换器电路2接收来自太阳能电池1的电流,并根据接收到的电流产生检测电压103,从而使检测电压103从电压转换器电路2的检测电压输出端24输出。电压转换器电路2的检测电压输出端24与占空比控制电路4的检测电压输入端33电连接,从而使检测电压103通过检测电压输入端33输入至占空比控制电路4中。
电压转换器电路2含有一个驱动时钟输入端23。占空比控制电路4含有一个驱动时钟输出端34,它与驱动时钟输入端23电连接。占空比控制电路4控制驱动时钟的占空比,并根据生成的电压101和经检测的电压103,产生具有受控占空比的驱动时钟104。具有受控占空比的驱动时钟104从驱动时钟输出端34输出,然后通过驱动时钟输入端23输入至电压转换器电路2。电压转换器电路2与驱动时钟104同步工作,以将生成的电压101转换成充电电压102。电压转换器电路2具有充电电压输出端22,从而使充电电压102从充电电压输出端22输出。电压转换器电路2的充电电压102输出端22与双层电容3电连接,从而使充电电压102提供给双层电容3,由此,双层电容3得到充电电压102的充电。
双层电容3储存从太阳能电池1通过电压转换器电路2而提供的电能。双层电容3比化学二次电池具有更长的充电/放电次数的寿命。
图3是图2所示太阳能充电系统中所包含的电压转换器电路的内部电路结构框图。如图3所示,电压转换器电路2可由一个升压型DC斩波电路构成。电压转换器电路2含有电容C1和C2,电感L1,二极管D1,n沟道晶体管Qn1,以及电阻R1。电压转换器电路2还具有功率输入端21,充电电压输出端22,驱动时钟输入端23,以及检测电压输出端24。
功率输入端21通过电容C1接地。功率输入端21通过电感L1与节点Na相连。节点Na通过n沟道晶体管Qn1与节点Nb相连。节点Nb也通过电阻R1接地。节点Nb直接与检测电压输出端24相连接,检测电压103通过此输出端24输出。n沟道晶体管Qn1的栅极与驱动时钟输入端23直接相连,以用于为n沟道晶体管Qn1的栅极提供驱动时钟104。
节点Na还通过二极管D1与充电电压输出端22相连。此充电电压输出端22通过电容C2接地。
图4的时序图显示了图3中的电压转换器电路的驱动时钟信号、节点Na上的电压、电流I1和I3以及电压Vc2的波形。电感L1中的电流I1按照从功率输入端21向节点Na的方向流动。n沟道晶体管Qn1中的电流I2按照从节点Na向节点Nb的方向流动。二极管D1中的电流I3从节点Na向充电电压输出端22的方向流动。电容C1具有电压Vc1,电容C2具有电压Vc2。
驱动时钟104所含有的一个周期T1由一个导通周期T2和一个截止周期T3组成。在导通周期T2中,驱动时钟104处于高电平“H”。在截止周期T3中,驱动时钟104处于低电平“L”。在导通周期T2期间,n沟道晶体管Qn1被置于导通状态,因为驱动时钟104处于高电平“H”。在截止周期T3期间,n沟道晶体管Qn1被置于截止状态,因为驱动时钟104处于低电平“L”。
在导通周期T2内,n沟道晶体管Qn1被至于导通状态,由此使节点Na具有地电位,并使二极管D1被反向偏置,从而使电流I3为0。电容C2放电以向双层电容提供电流,从而使电容C2的电压Vc2几乎线性地从高电压电平Ec降低到低电压电平Eb。
由于n沟道晶体管Qn1被置于导通状态,所以将有电流流经由电感L1、n沟道晶体管Qn1以及电阻R1所构成的闭合电路,其中电流I1等于电流I2。电流I1几乎线性地从一低电流值Aa上升至一高电流值Ab。
节点Nb所具有的电势Vb由Vb=I2×R1给出。节点Nb与节点Na具有相同的电势。检测电压103是节点Nb的电势,因为检测电压103的电压电平与节点Na电势相同的。检测电压103的电压电平几乎线性地从0升高至高电平Ea。电感L1的内部磁通量同时增大。
在截止周期T3内,n沟道晶体管Qn1被置于截止状态,由此使节点Na和节点Nb电隔离。电感L1内部的磁通量减小,而电感L1的感应电动势则与电感L1内部磁通量的减小相抵。所产生的感应电动势和电容C1的电压Vc1被加载在节点Na上,从而使节点Na具有高于Vc1的升高的电势Vc2。节点Na上提高的电势Vc2将使二极管D1正向偏置。
由于n沟道晶体管Qn1被置于截止状态,所以将有另一个电流流经由电容C1、电感L1、二极管D1以及电容C2所构成的闭合电路,其中电流I1等于电流I3。电容C2得到充电,使得电流I1几乎线性地从高电流值Ab下降至低电流值Aa。
图5的电路图显示了图2所示太阳能充电系统中所含有的占空比控制电路的内部电路结构。该占空比控制电路4含有电阻R2、R3、R4、R5、R6和R7,运算放大器Op1以及参考电压Vf1。占空比控制电路4还含有功率输入端31,控制输出端32,检测电压输入端33以及驱动时钟输出端34。
功率输入端31通过电阻R2与节点Nc相连。节点Nc通过电阻R4与运算放大器Op1的一个反相输入端相连。运算放大器Op1的同相输入端通过参考电压Vf1接地。运算放大器Op1的输出端与节点Nd相连。节点Nd通过电阻R5与运算放大器Op1反相输入端相连。节点Nd还通过电阻R6与节点Ne相连。节点Ne直接与控制输出端32相连。节点Ne还通过电阻R7与检测电压输入端33相连。控制输出端32也通过电阻R7与检测电压输入端33相连。
占空比控制电路4含有一个未在图5中示出的驱动时钟发生电路,该驱动时钟发生电路与控制输出端32相连。时钟控制电压105通过控制输出端32被提供给驱动时钟发生电路。
节点Nc的电势Vc由下式给出:
Vc=R3/(R2+R3)Vi (1)其中,Vi是太阳能电池所产生的生成电压101的电压。
运算放大器Op1利用与参考电压Vf1的电势差来执行电势Vc的反相放大。
节点Nd的电势Vd由下式给出:
Vd={(R4+R5)/R4}Vf1-(R5/R4)Vi (2)
在电压转换器电路2中,节点Nb的电势Vb被与流经n沟道晶体管Qn1的电流I2成正比地产生。电势Vb作为检测电压103而被从检测电压输出端24提供给占空比控制电路4的检测电压输入端33,从而在节点Ne上产生了电势Ve。
Ve=(Vb-Vd)×R6/(R6+R7) (3)
占空比控制电路4将电势Ve作为时钟控制电压105提供给驱动时钟发生电路,以使驱动时钟发生电路根据时钟控制电压105通过控制占空比来产生驱动时钟104。
驱动时钟发生电路根据电势为Ve的时钟控制电压105识别出电流I1。上限Ab和下限Aa已被预先设定好,从而使电流I1的平均值对应于一个输入电流,这样就能使太阳能电池通过提供最大充电功率以获得最大输出。驱动时钟发生电路根据电流I1的变化来控制驱动时钟104的占空比。
驱动时钟104被设定成高电平,并且驱动时钟发生电路监视电流I1。如果电流I1超过上限Ab,则驱动时钟发生电路将驱动时钟104设定成处于低电平,驱动时钟发生电路由此计时。如果该时间超过一预定值,则驱动时钟发生电路将驱动时钟104设定成高电平。
占空比控制电路4根据生成电压101和检测电压103识别出电压转换器电路2所消耗的功率,并产生一个带有受控占空比的时钟控制电压105。
图6显示出了太阳能电池的电压一电流特性曲线。此电压-电流特性是在四种照度S1、S2、S3和S4下被测得的。太阳能电池分别显示了四种照度S1、S2、S3和S4下的最大功率W1、W2、W3和W4。照度根据日光条件而会有较大的变化。太阳能电池的最大功率在很大程度上取决于照度。
图7显示了在最大功率条件下功率随照度的变化。图7中,实线代表最大功率条件下功率的特性曲线。虚线则代表一个与最大功率上的特性曲线相符的预设线性拟合直线。最大输出的特性曲线由四个最大输出功率W1、W2、W3和W4点给出。拟合线则通过假设在最大输出条件下电压和电流具有正比关系而获得。
如上所述,占空比控制电路4含有未在图中示出的驱动时钟发生电路。时钟控制电压通过一个输入端被输入至占空比控制电路4的驱动时钟发生电路。当最大输出电流在加载生成电压101的情况下流经负载时,太阳能电池1将为负载提供最大输出功率。在最大输出的特性曲线上,最大输出电流代表生成电压101的一个交叉点。
占空比控制电路4的驱动时钟发生电路根据时钟控制电压105的电势Ve控制驱动时钟104的导通周期T2。电压转换器电路2消耗由电流I2和电流I3组成的电流I1。
太阳能电池1所提供的主要电能由电压转换器电路2消耗。占空比控制电路4控制电压转换器电路2,从而使消耗的功率在线性拟合直线上移动。
根据本实施例所述,驱动时钟的占空比根据由生成电压决定的最大充电功率而受到控制,由此可以以太阳能电池的最大输出对电容充电。而最大输出则可根据日光条件而发生改变。第二实施例
以下将参考附图对本发明的第二实施例进行详细说明。图8的电路图显示了在根据本发明第二实施例所述太阳能充电系统中含有的其它电压转换器电路的内部电路结构。第二实施例与第一实施例的唯一不同之处在于其电压转换器电路的电路结构。
电压转换器电路2A可由一个升压型DC斩波电路构成。电压转换器电路2A含有电容C1、C2和C3,电感L1和L2,二极管D1,n沟道晶体管Qn1,以及电阻R1。电压转换器电路2A还具有功率输入端21,充电电压输出端22,驱动时钟输入端23,以及检测电压输出端24。
功率输入端21通过电容C1接地。功率输入端21通过电感L1与节点Na相连。节点Na通过n沟道晶体管Qn1与节点Nb相连。节点Nb也通过电阻R1接地。节点Nb直接与检测电压输出端24相连接,检测电压103通过此输出端24输出。n沟道晶体管Qn1的栅极与驱动时钟输入端23直接相连,以用于为n沟道晶体管Qn1的栅极提供驱动时钟104。
节点Na还通过电容C3与节点Nc相连。节点Nc通过电感L2接地。节点Nc还通过二极管D1与充电电压输出端22相连。此充电电压输出端22通过电容C2接地。
电压转换器电路2A通过升高或降低电压电平来调整生成电压101,以产生充电电压102。由于电压转换器电路2A既能升高也能降低生成电压101的电压电平,所以增大了生成电压101和充电电压102的可接受范围,进而放宽了太阳能电池1和双层电容3的选择条件。
根据本实施例所述,驱动时钟的占空比根据由生成电压决定的最大充电功率而受到控制,由此,就能以太阳能电池的最大输出对电容进行充电,其中,最大输出可根据日光条件而相应改变。
作为对上述实施例的可能的修改,可以在占空比控制电路4中集成入一个用于改变电压转换器电路的电路类型的微电脑,这样就可在该微电脑的控制下找到来自生成电压101的最大输出上的输入电流。
虽然以上参考了几个优选实施例对本发明作了说明,但是应该明白,这些实施例仅用来说明本发明,而并不是对本发明的限制。本领域技术人员在阅读完本文之后会立刻明白,可对本发明进行等价材料和技术上的各种修改和替代,并且这些修改和替代都属于所附权利要求的范围和精神之内。
Claims (6)
1.一种太阳能充电系统,其特征在于包括:
电压转换器,用于将太阳能电池所产生的原始电压的电压电平转换成充电电压,并利用上述充电电压对电容进行充电:以及
与上述电压转换器电连接的占空比控制电路,用于为上述电压转换器提供驱动时钟,以使上述电压转换器根据上述驱动时钟进行操作,
其中,上述占空比控制电路根据最大充电功率来调整上述驱动时钟的占空比,该最大充电功率取决于太阳能电池所产生的上述原始电压。
2.如权利要求1所述的太阳能充电系统,其特征在于,上述电压转换器电路产生检测电压,上述占空比控制电路接收检测电压,并且上述占空比控制电路根据除上述最大充电功率以外的上述检测电压对上述占空比进行调整。
3.如权利要求1所述的太阳能充电系统,其特征在于,上述占空比控制电路,根据预设的拟合线来调整上述占空比,该拟合线是通过参考太阳能电池的最大充电功率的电压-电流特性曲线而被拟合出来的。
4.如权利要求1所述的太阳能充电系统,其特征在于,上述电压转换器电路能够提升上述太阳能电池所产生的上述原始电压的上述电压电平。
5.如权利要求1所述的太阳能充电系统,其特征在于,上述电压转换器电路既能提升又能降低上述太阳能电池所产生的上述原始电压的上述电压电平。
6.如权利要求1所述的太阳能充电系统,其特征在于,上述电容器由双层电容构成。
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US6429621B1 (en) | 2002-08-06 |
CA2366352C (en) | 2005-08-16 |
JP2002199614A (ja) | 2002-07-12 |
US20020084767A1 (en) | 2002-07-04 |
CA2366352A1 (en) | 2002-06-28 |
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