CN1459216A - 光源控制设备 - Google Patents

光源控制设备 Download PDF

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CN1459216A
CN1459216A CN02800705A CN02800705A CN1459216A CN 1459216 A CN1459216 A CN 1459216A CN 02800705 A CN02800705 A CN 02800705A CN 02800705 A CN02800705 A CN 02800705A CN 1459216 A CN1459216 A CN 1459216A
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light
light source
display
equipment according
equipment
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CN100367827C (zh
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S·穆图
张劲
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Signify Holding BV
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Koninklijke Philips Electronics NV
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H05B45/24—Controlling the colour of the light using electrical feedback from LEDs or from LED modules
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/39—Circuits containing inverter bridges
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/385—Switched mode power supply [SMPS] using flyback topology

Abstract

本发明披露了一种用于控制和调节用于零售陈列系统的陈列光的设备，该设备包括与多个光源关联、用于调节光源以选择性地陈列特定产品的计算机。根据对多种产品中的每种产品规定最佳照明条件的预存表和反馈实际照明条件的反馈回路，调节这些光源。

Description

光源控制设备
本发明涉及商业陈列系统等，更具体地说，本发明涉及用于照亮这种商业陈列系统等的改进型设备。本发明特别可以应用于在零售环境下使用的商业冷藏系统，例如零售陈列冰柜。
基于红-绿-蓝(RGB)的白色发光二极管(“LED”)的发光过程在本技术领域内众所周知，它可以应用于背照LCD显示板、照亮商业冰柜、标记等。对于这些应用，可以采用线性电源或开关型电源驱动LED。采用线性电源的整个系统的效率低，而采用开关型电源克服了此问题。由于存在3种LED光源，所以根据适当电流控制方案，利用3个独立电源驱动LED。在此配置中，每个电源可以含有独立AC/DC变换器、功率因数校正单元、隔离变压器以及DC/AC变换器系统。在此方案中，由于有3个独立AC/DC变换器、功率因数校正单元和隔离变压器，所以存在冗余。此外，还要求单独控制电源内的各变换器。此方案会增加成本、提高控制的复杂度并降低性能。
在此说明的现有技术的另一个问题是，精确控制所发出的每种光的量。更具体地说，由红、绿和蓝发光二极管发出的光的组合产生的光的颜色主要由混合在一起的每种光的相对量确定。每种光的光源对寿命和温度以及其它因素具有不同的敏感度。因此，要保持适当量的每种颜色的光使得最终产生总光量合适即使有可能也是非常困难的。
当前系统中未解决的另一个问题是，在陈列箱或零售陈列冷藏设备内，用于陈列特定产品的光的种类和光量影响顾客的购买决定。现在没有哪种技术总能确保利用最佳光照条件陈列每种特定产品。
根据本发明可以克服现有技术的上述以及其它问题，本发明涉及适用于商业陈列照明系统的LED电流驱动器。根据本发明，各驱动器以互相之间的特定比例驱动红、绿和蓝LED。反馈回路将颜色信息和光强信息送到微处理器，微处理器调节红、绿、蓝各自的光量以实现规定的照明光强和照明颜色。
在增强型实施例中，提供了计算机和存储器，以根据要陈列的特定产品或一天中的特定时间，确定所使用的光的光强和颜色。具体地说，计算机调节光的颜色和/或光强以在特定时间优化陈列，或者对特定产品进行优化陈列。在一个典型实施例中，利用微处理器控制AC分布电源系统将LED驱动电流送到白LED照明器以照亮商业冰柜。该AC分布系统含有：前端AC/DC变换器，可以进行功率因数校正；高频逆变器；隔离变压器；以及3个DC/AC变换器，具有RGB驱动电流控制系统。单个前端AC/DC变换器系统转换AC电源并保持恒DC链路电压作为高频DC/AC逆变器的输入。AC/DC变换器还在AC电网上进行功率因数校正。高频变换器将DC电压转换为AC电压，并利用LED驱动电流控制，对3个AC/DC变换器提供电源。
微处理器系统控制功率变换器系统。除了对LED照明器产生的白色光进行控制外，微处理器系统还对该变换器系统提供集总闭环控制和PWM的生成。该方法对LED驱动器系统提供了一种综合解决方案。微处理器系统的控制算法被设计为模块化并具有多处理特性，以提供微处理器系统的有效控制能力。
微处理器系统还可以选择性地连接到用户计算机，该计算机根据冰柜内陈列的食品进行了编程。在将特定食品陈列在冰柜内时，根据编程的用户优先权，商场内的计算机选择该系统应该产生的适当白色点和照明程度。该计算机在合适的时间将此信息送到微处理器系统，微处理器控制驱动系统产生要求的颜色和照明程度。因此，可以自动选择用于陈列食品的颜色和照明程度。计算机还可以以这样的方式开启或停止冰柜驱动器，即在不需要时，自动关闭冰柜内的光，从而节省了电能。
在另一个增强型实施例中，该系统设计为从诸如手持键盘或条形码扫描器的输入装置接收数据。
图1示出本发明典型实施例的总体方框图；
图2示出与本发明一起使用的分布式电源的示意图；
图3示出根据本发明典型实施例用于驱动发光二极管的分布式电源的第二实施例；以及
图4示出用于选择照明系统的特定颜色的用户接口。
图1示出根据本发明典型实施例用于基于RGB LED的冰柜驱动器的微处理器控制的AC电源系统的总图。前端AC/DC变换器10、高频DC/AC变换器20以及用于提供RGB LED驱动电流的3个负载端AC/DC变换器30、31和32提供电源。该系统包括红、绿和蓝LED光源120、130和140。每个红、绿和蓝LED光源均由多个适当串联和/或并联配置的LED构成。
光源内还有对白色光进行闭环反馈控制的诸如光敏二极管的光传感器和热沉温度传感器(未示出)。将光源的光输出送到混合光学元件和光纤系统，以将该光传送到冰柜或类似环境中。然而，可以采用传送光的任何适当装置。
微处理器系统50控制该系统。微处理器系统利用反馈系统62将变量送到微处理器50。将控制信号送到PWM处理与隔离61用于控制DC/AC变换器20，如图所示。通过调节所产生的PWM信号的振幅和/或占空比，调节送到每个驱动器30至32的功率。
微处理器系统与用户接口和消息显示系统64相连。或者通过红外通信或者通过串行/并行端口52，微处理器系统还与可选计算机51或计算机网络53相连。
前端AC/DC变换器10的主要功能是将AC电压变换为DC电压。此外，使AC/DC变换器10在可能具有常规电压输入的AC电网进行功率因数校正。前端AC/DC变换器10基于回扫或升压拓扑结构。
微处理器50实现用于输出电压和AC电网功率因数校正的反馈控制系统，微处理器50通过PWM处理与隔离器61输出所需控制信号。微处理器50还产生PWM选通信号。为此，除了DC链路电压外，线电流也是反馈变量之一，它示于62。
然后，微处理器50直接将PWM选通信号送到AC/D变换器10。可选地，还可以在外部实现功率因数校正和PWM处理功能。在这种情况下，AC/DC变换器含有用于进行PFC和PWM处理的必要功能块。
将AC/DC变换器系统的输出连接到高频DC/AC变换器系统20的输入部分。DC/AC变换器系统将DC电压变换为高频AC电压。或者利用谐振变换器拓扑结构，或者利用矩形波变换器拓扑结构实现DC/AC变换器。例如，图2示出基于谐振变换器拓扑结构的DC/AC变换器系统。在图2中，谐振变换器系统基于与谐振回路201相连的半桥式变换器系统202。可选地，也可以采用全桥式配置。将该变换器的输出送到其输出与高频隔离变压器203相连的适当谐振回路。然后，该变压器驱动变换器30至32，如图所示。
对于特定应用，可以做某些简化。例如，在光输出电平不高时，可以采用一些单级电路。图3示出图2所示电源系统的另一个实施例。图3所示的装置包括利用唯一功率因数校正过程运行的、并联的3个回扫变换器。在这种情况下，以输入电压的线路频率实现AC分布系统。该系统也由微处理器50控制。
回头参考图1，将AC/DC变换器30至32的输出连接到RGB LED光源，并将调节后的驱动电流送到LED光源120、120和140。可以将恒DC电流或PWM电流脉冲送到RGB LED光源。为了根据公知技术控制白色光的颜色和照明程度，利用白色光控制系统确定DC电流的振幅或PWM电流脉冲的占空比。该控制系统也可以由微处理器实现。
如图1所示，适当光传感器40和热沉温度传感器41用于检测LED的光输出和热沉温度。通过反馈电路62，将这些参数送到微处理器50。微处理器50计算白色照明器的颜色和照明程度。然后，微处理器50求得要求的LED驱动电流或PWM选通脉宽。然后，控制AC/DC变换器提供要求的LED驱动电流。
为了将反馈信号输入到微处理器系统，采用了反馈电路62。反馈电路62包括用于将反馈信号直接送到微处理器系统50内的模数转换器161的检测与调节电路。反馈变量可以包括：LED120、130和140输出的LED光输出、传感器41输出的热沉温度、LED驱动电流、DC链路电源和/或线电流。
反馈电路还包括故障检测电路，在出现故障时，该故障检测电路就产生中断。将故障检测电路的输出直接连接到微处理器系统内的不可掩蔽的中断。
微处理器50直接提供PWM选通信号，该PWM选通信号首先通过隔离电路61。将隔离电路的输出送到AC/DC变换器10、DC/AC变换器20以及LED驱动器30、31和32内的专用MOSFET驱动器。
微处理器50还与用户接口系统63相连，用于手动选择白色发光二极管的颜色和照明程度。图4示出用户接口系统的典型实施例，该用户接口系统包括开关401至403以及开关解码逻辑电路404。在开关闭合时，解码逻辑电路404检测到开关闭合，并输出数字形式的数据。利用红外通信或通过电缆或其它装置，将解码逻辑输出连接到微处理器。用户接口63还包括用于启动或停止该系统的ON/OFF开关401，而且开关401还用于选择颜色和照明程度。
微处理器50还与消息显示系统64相连，消息显示系统64用于显示微处理器系统的状态，例如选择颜色、系统状况以及照明程度。
微处理器50可以包括：至少一个CPU或DSP 160；诸如模数转换器和数模转换器的模拟接口装置161；诸如串行输入/输出、红外端口、JTAG接口、数字端口的数字接口162；以及诸如存储器、定时器以及时钟的其它装置163。如果要在微处理器系统内实现所有控制功能和PWM处理，则可以采用具有一个以上微处理器的多处理器系统。
将用于检测光、LED驱动电流以及DC链路电压的反馈电路62的输出输入到模数转换器161，模数转换器161将模拟信号转换为控制算法使用的数字信号。
微处理器系统还与计算机51相连，计算机51内含有关于食品以及将要陈列在冰柜内的食品的时间、日期的信息。还对计算机进行编程以根据要陈列的食品选择适当白色点和照明程度。通过红外端口，或者通过串行端口或并行端口或者JTAG连接器，微处理器系统可以与该计算机相连。对微处理器系统适当配备有合适的接口系统来处理这种连通性。然后，根据要处理的食品，该计算机提供关于白色发光二极管的颜色和照明程度的信息。因此，可以自动选择白色发光二极管的颜色和照明程度，并根据食品自动产生适当白色光。
该计算机还含有关于商场营业时间的信息。因此，可以在商场开始营业时它启动冰柜LED光源，而在商场停止营业时关闭该驱动器。这种设计自动节省能源。
可选地，计算机或者在本机存储所有产品的数据库，或者访问所有产品的数据库，而不存储使用时间。在用户将产品放入冰柜时，他或她利用可选条形码阅读器、手持键盘或其它类似装置将它扫描到计算机内。然后，该计算机通过查表，根据该产品的存储信息，设置照明程度和颜色。
尽管以上对本发明优选实施例进行了说明，但是本技术领域内的技术人员可以设想对其做各种调整和附加。这些调整属于所附权利要求所述的本发明范围。

Claims (10)

1.用于对要被混合而形成预定颜色的光的多个光源进行控制的设备，所述设备包括：
多色传感器，用于检测每个所述光源发出的光量；
存储装置，用于存储指示期望每个所述光源发出的光量的预定值；
处理器，用于将检测的每个所述光源发出的光量与要求的每个所述光源发出的光量进行比较，并根据比较结果对所述光源的电源的输入值进行调节。
2.根据权利要求1所述的设备，其中被调节的所述值是脉宽调制(PWM)信号。
3.根据权利要求2所述的设备，其中被调节的所述PWM值至少是所述PWM信号的振幅或占空比之一。
4.根据权利要求1所述的设备，其中所述处理器与独立计算机相连，所述计算机包括用于根据测量条件和预定输入控制所述光源发出的光量的数据和软件。
5.根据权利要求4所述的设备，其中通过输入将要利用预定颜色的所述光陈列的产品，获得所述测量条件，并且所述预定输入是表示利用其陈列所述产品的预定颜色的存储值。
6.根据权利要求4所述的设备，其中所述测量条件是时间。
7.根据权利要求2所述的设备，其中调节所述PWM信号以控制预定颜色和以所述颜色发出的光的光强。
8.根据权利要求1所述的、至少用于调节颜色和为了陈列要销售的产品而需发出的光强之一的设备，所述设备包括：
存储值表，所述存储值表示用于各种待陈列产品的多个光源中的每个光源的期望相对值；
外部接口，用于从输入装置接收表示将要利用所述光陈列的产品的信息；以及
控制逻辑，用于执行查表，并调节各光源的相对光强从而使所述光源发出所述要求存储值。
9.根据权利要求8所述的设备，其中所述输入装置是条形码扫描器。
10.根据权利要求1所述的设备，该设备进一步包括DC/AC变换器，用于独立调节多个发光二极管(LED)驱动器中的每个发光二极管驱动器的输出电流。
CNB028007050A 2001-03-16 2002-03-14 光源控制设备 Expired - Lifetime CN100367827C (zh)

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CN100367827C (zh) 2008-02-06
ATE369721T1 (de) 2007-08-15
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