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    • 2. 发明授权
    • Coded communication system and method for controlling an electric lamp
    • 用于控制电灯的编码通信系统和方法
    • US5872429A
    • 1999-02-16
    • US824024
    • 1997-03-25
    • Yongping XiaSreeraman VenkitasubrahmanianRaj JayaramanThomas Farkas
    • Yongping XiaSreeraman VenkitasubrahmanianRaj JayaramanThomas Farkas
    • H05B37/02H05B41/282H05B41/298H05B41/392
    • H05B41/2828H05B37/0263H05B41/2981H05B41/3921Y10S315/04
    • A communication method particularly suited for lighting control employs encoding of perturbations in a voltage signal having a fundamental period with a nominal waveform. A control period includes a pre-selected number of fundamental periods of the voltage signal. Different control commands are indicated by imposing a selected perturbation, such as a phase cut, on the nominal waveform with a respective occurrence signature within the control period. The control commands are decoded from the voltage signal by detecting the occurrence signature of the perturbations within each control period. Decoding is accomplished by differentiating the nominal waveform to detect encoded perturbations. The technique is particularly suited for two-wire dimming applications for gas discharge lamps, in which the voltage signal carrying the encoded commands is the sinusoidal mains voltage powering the ballast, since the encoded perturbations may be small enough so that lamp flicker is avoided even with encoded signals on the line voltage. In a favorable embodiment for dimming, no perturbations are introduced on the line voltage unless a change in the operating characteristic, for example the light level, of the electric lamp is desired. This has the advantage that when lamp operation is to be kept constant, no distortions are imposed on the mains voltage, so that flicker of the lamp(s) is completely avoided and there are no adverse effects to the power factor, THD or component stress.
    • 特别适用于照明控制的通信方法使用具有标称波形的基本周期的电压信号中的扰动编码。 控制周期包括电压信号的预选数量的基本周期。 通过在控制周期内具有相应的发生签名在标称波形上施加选择的扰动(例如相位切除)来指示不同的控制命令。 通过检测每个控制周期内扰动的发生特征,从电压信号对控制命令进行解码。 通过区分标称波形来检测编码的扰动来完成解码。 该技术特别适用于气体放电灯的双线调光应用,其中携带编码命令的电压信号是为镇流器供电的正弦电源电压,因为编码的扰动可能足够小,以便避免灯闪烁,即使使用 编码信号的线路电压。 在用于调光的有利实施例中,除非需要电灯的工作特性(例如光级)的改变,否则不会在线路电压上引入扰动。 这样做的优点在于,当灯管运行保持恒定时,不会对电源电压造成失真,从而完全避免了灯的闪烁,并且对功率因数,THD或分量应力没有不利影响 。
    • 3. 发明授权
    • Electronic ballast with interface circuitry for multiple dimming inputs
    • 具有多个调光输入接口电路的电子镇流器
    • US5691605A
    • 1997-11-25
    • US512868
    • 1995-08-09
    • Yongping XiaJoshua ZhuSreeraman VenkitasubrahmanianRaj JayaramanThomas Farkas
    • Yongping XiaJoshua ZhuSreeraman VenkitasubrahmanianRaj JayaramanThomas Farkas
    • H05B41/38H05B37/02H05B41/285H05B41/36H05B41/392H02B37/02
    • H05B41/2855H05B37/0263H05B41/2985H05B41/36H05B41/3921H05B41/3924Y10S315/04
    • A lamp controller includes an interface circuit, or receiver, which receives an input signal and decodes control signals supplied from a transmitting device, such as a power line wall controller, according to at least two of the following communication techniques: phase angle control, step control, and coded control. The receiver tests the input signal and identifies which type of control technique is employed by the wall controller connected to the lamp controller. The receiver then decodes the control command from the input signal. In a disclosed embodiment, the lamp controller is gas discharge lamp dimming ballast having a two wire input for connection to the hot dimmed and neutral leads of the power line controller. The ballast has an improved topology in which a pre-conditioner supplies a substantially constant DC voltage to a ballast stage including an inverter, a resonant tank output and a control circuit. The dim signal output by the receiver is independent of the DC rail voltage and, in combination with the maintenance of a substantially constant DC rail voltage, permits of improved dimming control while providing the ease of installation of a two wire ballast.
    • 灯控制器包括接口电路或接收器,接口电路或接收器根据以下通信技术中的至少两个接收输入信号和解码从诸如电力线壁控制器的发送设备提供的控制信号:相位角控制,步骤 控制和编码控制。 接收机测试输入信号,并识别连接到灯控制器的墙壁控制器采用哪种类型的控制技术。 然后,接收器从输入信号解码控制命令。 在公开的实施例中,灯控制器是具有两线输入的气体放电灯调光镇流器,用于连接到电力线控制器的热调光和中性线。 镇流器具有改进的拓扑结构,其中预调节器向包括逆变器,谐振回路输出和控制电路的镇流器提供基本上恒定的DC电压。 由接收器输出的暗信号与直流轨道电压无关,并且与基本上恒定的直流轨电压的维持相结合,允许改进的调光控制,同时提供双线镇流器的易于安装。
    • 5. 发明授权
    • Electronic ballast with interface circuitry for phase angle dimming
control
    • 具有接口电路的电子镇流器,用于相位角调光控制
    • US5559395A
    • 1996-09-24
    • US414859
    • 1995-03-31
    • Sreeraman VenkitasubrahmanianThomas FarkasRaj JayaramanYongping Xia
    • Sreeraman VenkitasubrahmanianThomas FarkasRaj JayaramanYongping Xia
    • H05B37/02H05B41/285H05B41/36H05B41/392
    • H05B41/2985H05B37/0263H05B41/2855H05B41/36H05B41/3921H05B41/3924Y10S315/04
    • A gas discharge lamp dimming ballast has a two wire input for connection to the hot dimmed and neutral leads of a phase control dimmer. The ballast has an improved topology in which a pre-conditioner supplies a substantially constant DC voltage to a ballast stage including an inverter, a resonant tank output and a control circuit. A dimming interface circuit derives a dimming signal having a voltage equal to the average value of the rectified output voltage of a full-bridge rectifier feeding the pre-conditioner circuit. The dim signal is independent of the DC rail voltage and, in combination with the maintenance of a substantially constant DC rail voltage, permits of improved dimming control while providing the ease of installation of a two wire ballast. The response time of the interface circuit relative to the pre-conditioner is selected to avoid power imbalances. The ballast also includes an EMI filter and circuitry to prevent capacitive hold-up by the EMI filter of the rectified voltage to preserve the conduction angle for the interface circuit.
    • 气体放电灯调光镇流器具有两线输入,用于连接到相位控制调光器的热调光和中性线。 镇流器具有改进的拓扑结构,其中预调节器向包括逆变器,谐振回路输出和控制电路的镇流器提供基本上恒定的DC电压。 调光接口电路导出具有等于馈送预调节器电路的全桥整流器的整流输出电压的平均值的电压的调光信号。 昏暗的信号与直流轨道电压无关,并且与基本上恒定的直流轨道电压的维持相结合,允许改进的调光控制,同时提供双线镇流器的易于安装。 选择接口电路相对于预调节器的响应时间以避免电源不平衡。 镇流器还包括EMI滤波器和电路,用于防止EMI滤波器对整流电压的电容性保持,以保持接口电路的导通角。
    • 6. 发明授权
    • Lamp ballast with lamp rectification detection circuitry
    • 灯镇流器带灯整流检测电路
    • US5808422A
    • 1998-09-15
    • US645545
    • 1996-05-10
    • Sreeraman VenkitasubrahmanianClint MasonYongping XiaFeng-Kang HuJaap Schlejen
    • Sreeraman VenkitasubrahmanianClint MasonYongping XiaFeng-Kang HuJaap Schlejen
    • H05B41/24H05B41/298H05B37/02
    • H05B41/2985
    • A ballast for a gas discharge lamp includes a detection circuit which detects an operating state of the lamp in which the lamp current for the column discharge of one polarity is different from the lamp current for the column discharge of the other polarity by detecting the DC component of the voltage across the discharge lamp. The detection circuit includes (i) a device coupled such that a DC voltage is imposed there across when the lamp current is different for the column discharge according to one polarity verses the other polarity, and (ii) a sensing circuit for sensing the DC voltage across the device. The device may be a capacitive device, and in a particularly inexpensive implementation, is a DC blocking capacitor or a ballast capacitor. The sense circuit senses when the DC voltage across the device exceeds a threshold value, which may corresponds to fully-rectified state of the lamp or more favorably, to a lesser state of imbalance. In another embodiment, the variance in the DC voltage across the lamp is detected at the midpoint of a bridge inverter. A control circuit changes the output of the ballasting circuit when the DC voltage exceeds the threshold value to turn off the lamp or to recurrently cycle the lamp on and off to signal the user that the lamp needs to be changed.
    • 用于气体放电灯的镇流器包括检测电路,该检测电路通过检测DC分量来检测一极性的列排出的灯电流与用于另一极性的列放电的灯电流不同的灯的工作状态 的放电灯两端的电压。 检测电路包括(i)耦合的器件,使得当灯电流根据一种极性与另一极性相反的列电压不同时,直流电压被施加到该电极上,以及(ii)用于感测直流电压的感测电路 跨设备。 该装置可以是电容性装置,并且在特别廉价的实施方式中,是直流阻塞电容器或镇流电容器。 感测电路感测器件上的直流电压何时超过阈值,其可以对应于灯的完全整流状态或更有利地达到较小的不平衡状态。 在另一个实施例中,在桥式逆变器的中点处检测灯两端的直流电压的变化。 当直流电压超过阈值时,控制电路改变镇流电路的输出,以关闭灯泡或打开或关闭灯泡,以便向用户发出指示灯需要改变的信号。
    • 8. 发明授权
    • Lamp ballast for accurate control of lamp intensity
    • 灯泡镇流器,用于精确控制灯具强度
    • US6100647A
    • 2000-08-08
    • US221957
    • 1998-12-28
    • Demetri J. GiannopoulosIhor T. WacykSreeraman Venkitasubrahmanian
    • Demetri J. GiannopoulosIhor T. WacykSreeraman Venkitasubrahmanian
    • H05B41/24H05B41/392H05B37/02
    • H05B41/3925Y10S315/04Y10S315/07
    • An electronic ballast for an electron discharge lamp includes a resonant inverter driven by a high frequency switching signal supplied by a drive circuit which is substantially comprised in an integrated circuit, the lamp being connected in an output circuit of the inverter and powered thereby. The lamp intensity is controlled by changing the switching signal frequency, thereby changing the power supplied to the lamp. In order to prevent parasitic capacitance of remote wiring between the ballast and the lamp from causing inaccuracies in determination of the power being supplied to the lamp, the ballast takes into account the phase difference between lamp current and voltage in making such determination. For example, by deriving the product of rectified lamp voltage and rectified lamp current, and using the arithmetic summation of such products during each operating cycle as a measure of lamp power.
    • 一种用于电子放电灯的电子镇流器包括由基本上包括在集成电路中的驱动电路提供的高频开关信号驱动的谐振逆变器,该灯被连接在逆变器的输出电路中并由此供电。 通过改变开关信号频率来控制灯的强度,从而改变提供给灯的功率。 为了防止镇流器和灯之间的远程布线的寄生电容在确定供应给灯的功率方面产生不准确性,在进行这种确定时,镇流器考虑了灯电流和电压之间的相位差。 例如,通过得出整流灯电压和整流灯电流的乘积,并且在每个操作周期中使用这些产品的算术求和作为灯功率的量度。