专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US5808422A Lamp ballast with lamp rectification detection circuitry 失效
标题翻译：灯镇流器带灯整流检测电路
公开(公告)号：US5808422A
公开(公告)日：1998-09-15
申请号：US645545
申请日：1996-05-10
申请人： Sreeraman Venkitasubrahmanian , Clint Mason , Yongping Xia , Feng-Kang Hu , Jaap Schlejen
发明人： Sreeraman Venkitasubrahmanian , Clint Mason , Yongping Xia , Feng-Kang Hu , Jaap Schlejen
IPC分类号： H05B41/24 , H05B41/298 , H05B37/02
CPC分类号： H05B41/2985
摘要： 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.
摘要翻译：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。

2. 发明授权

US5382881A Ballast stabilization circuitry for eliminating moding or oscillation of the current envelope in gas discharge lamps and method of operating 失效
标题翻译：用于消除气体放电灯中的电流包络的调制或振荡的镇流器稳定电路及其操作方法
公开(公告)号：US5382881A
公开(公告)日：1995-01-17
申请号：US997989
申请日：1992-12-28
申请人： Thomas Farkas , Sreeraman Venkitasubrahmanian
发明人： Thomas Farkas , Sreeraman Venkitasubrahmanian
IPC分类号： H05B41/02 , H05B41/24 , H05B41/298 , H05B41/392 , G05F1/00
CPC分类号： H05B41/392 , H05B41/2988 , Y10S315/05 , Y10S315/07
摘要： A ballast stabilization arrangement is provided for minimizing or eliminating lamp current oscillation, or moding, of gas discharge lamps, such as fluorescent lamps, and a method for carrying out this arrangement is described. This is carried out by adding a frequency response zero to the current circuitry in a ballast. An example of this circuitry includes a feedback network where a sensed lamp current signal is compared with a reference signal by an error amplifier having a resistance placed in series with its feedback capacitance to implement the zero in the frequency response of the control circuit.
摘要翻译：提供了一种用于最小化或消除诸如荧光灯的气体放电灯的灯电流振荡或调制的镇流器稳定装置，并且描述了用于执行这种布置的方法。这通过在镇流器中的当前电路添加频率响应零来实现。该电路的示例包括反馈网络，其中感测到的灯电流信号与具有与其反馈电容串联的电阻的误差放大器与参考信号进行比较，以实现控制电路的频率响应中的零。

3. 发明授权

US06628091B2 Electronic switch for a bi-level fluorescent lamp fixture 失效
公开(公告)号：US06628091B2
公开(公告)日：2003-09-30
申请号：US09867261
申请日：2001-05-29
申请人： John Griffin , Romel Panlilio , Sreeraman Venkitasubrahmanian
发明人： John Griffin , Romel Panlilio , Sreeraman Venkitasubrahmanian
IPC分类号： G05F100
CPC分类号： H05B41/42 , H05B41/2827
摘要： The present invention provides electronic switching for a bi-level fluorescent lamp fixture that allows power to be switched on and off to a group of lamps in a fixture when more or less illumination is needed in an area. The power can be switched without the need to power down the fixture when switching from high level with all lamps illuminated to a low level with only part of the lamps illuminated. The lamp current or frequency can be adjusted to save power when only part of the lamps are illuminated.

4. 发明授权

US6100647A Lamp ballast for accurate control of lamp intensity 失效
标题翻译：灯泡镇流器，用于精确控制灯具强度
公开(公告)号：US6100647A
公开(公告)日：2000-08-08
申请号：US221957
申请日：1998-12-28
申请人： Demetri J. Giannopoulos , Ihor T. Wacyk , Sreeraman Venkitasubrahmanian
发明人： Demetri J. Giannopoulos , Ihor T. Wacyk , Sreeraman Venkitasubrahmanian
IPC分类号： H05B41/24 , H05B41/392 , H05B37/02
CPC分类号： H05B41/3925 , Y10S315/04 , Y10S315/07
摘要： 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.
摘要翻译：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。

5. 发明授权

US5872429A Coded communication system and method for controlling an electric lamp 失效
标题翻译：用于控制电灯的编码通信系统和方法
公开(公告)号：US5872429A
公开(公告)日：1999-02-16
申请号：US824024
申请日：1997-03-25
申请人： Yongping Xia , Sreeraman Venkitasubrahmanian , Raj Jayaraman , Thomas Farkas
发明人： Yongping Xia , Sreeraman Venkitasubrahmanian , Raj Jayaraman , Thomas Farkas
IPC分类号： H05B37/02 , H05B41/282 , H05B41/298 , H05B41/392
CPC分类号： H05B41/2828 , H05B37/0263 , H05B41/2981 , H05B41/3921 , Y10S315/04
摘要： 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.
摘要翻译：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。

6. 发明授权

US5850127A EBL having a feedback circuit and a method for ensuring low temperature lamp operation at low dimming levels 失效
标题翻译： EBL具有反馈电路和用于在低调光水平下确保低温灯操作的方法
公开(公告)号：US5850127A
公开(公告)日：1998-12-15
申请号：US644094
申请日：1996-05-10
申请人： Joshua Zhu , Sreeraman Venkitasubrahmanian
发明人： Joshua Zhu , Sreeraman Venkitasubrahmanian
IPC分类号： H05B41/298 , H05B41/392 , H05B37/02
CPC分类号： H05B41/3921 , H05B41/2988 , Y10S315/04
摘要： A dimming ballast lamp includes a lamp, a ballast circuit for converting AC input power to AC output power, a dimming interface circuit for generating a dimming control signal having a voltage level indicative of a selected dimming level of the lamp and a dimming circuit responsive to the dimming control signal for controlling operation of the ballast circuit. A feedback control circuit detects the lamp voltage and produces a feedback control signal in response to the lamp voltage exceeding a perscribed threshold voltage level. The dimming circuit, responsive to the feedback control signal, controls operation of the ballast circuit so as to increase lamp current thereby increasing the dimming level of the lamp, ensuring low temperature ignition of the lamp and protecting against lamp shutdown.
摘要翻译：调光镇流器灯包括灯，用于将AC输入功率转换为AC输出功率的镇流器电路;调光接口电路，用于产生具有指示灯的选定调光电平的电压电平的调光控制信号，以及响应于用于控制镇流器电路的操作的调光控制信号。反馈控制电路检测灯电压并且响应于灯电压超过被摄阈值电压电平而产生反馈控制信号。调光电路响应于反馈控制信号，控制镇流器电路的运行，从而增加灯电流，从而增加灯的调光电平，确保灯的低温点火并防止灯关闭。

7. 发明申请

US20060097666A1 Symmetric cancelling anti-striation circuit 失效
标题翻译：对称消除反纹路电路
公开(公告)号：US20060097666A1
公开(公告)日：2006-05-11
申请号：US10537008
申请日：2003-11-18
申请人： Sreeraman Venkitasubrahmanian , Ramakrishnan Venkatraman , Amr Ghazala
发明人： Sreeraman Venkitasubrahmanian , Ramakrishnan Venkatraman , Amr Ghazala
IPC分类号： H05B39/00 , H05B41/00
CPC分类号： H05B41/2985 , H05B41/2858 , H05B41/2988
摘要： A striation correction circuit 300 is arranged to apply a first striation correction current to the first fluorescent lamp L1 and a second striation correction current to the second fluorescent lamp L2. A first voltage appearing across the first fluorescent tube L1 due to the first striation correction current is substantially similar in magnitude but has inverted polarity with respect to a second voltage across the second fluorescent tube L2 due to the second striation correction current. Detection of an end-of-life condition of a fluorescent lamp is facilitated.
摘要翻译：条纹校正电路300被布置成将第一条纹校正电流施加到第一荧光灯L 1，并且向第二荧光灯L 2施加第二条纹校正电流。由于第一条纹校正电流，出现在第一荧光管L 1上的第一电压在幅度上基本相似，但由于第二条纹校正电流而相对于第二荧光管L 2上的第二电压具有反相极性。荧光灯的寿命终止状态的检测变得容易。

8. 发明授权

US5691605A Electronic ballast with interface circuitry for multiple dimming inputs 失效
标题翻译：具有多个调光输入接口电路的电子镇流器
公开(公告)号：US5691605A
公开(公告)日：1997-11-25
申请号：US512868
申请日：1995-08-09
申请人： Yongping Xia , Joshua Zhu , Sreeraman Venkitasubrahmanian , Raj Jayaraman , Thomas Farkas
发明人： Yongping Xia , Joshua Zhu , Sreeraman Venkitasubrahmanian , Raj Jayaraman , Thomas Farkas
IPC分类号： H05B41/38 , H05B37/02 , H05B41/285 , H05B41/36 , H05B41/392 , H02B37/02
CPC分类号： H05B41/2855 , H05B37/0263 , H05B41/2985 , H05B41/36 , H05B41/3921 , H05B41/3924 , Y10S315/04
摘要： 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.
摘要翻译：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。

9. 发明授权

US5519313A Temperature-compensated voltage regulator 失效
标题翻译：温度补偿电压调节器
公开(公告)号：US5519313A
公开(公告)日：1996-05-21
申请号：US43418
申请日：1993-04-06
申请人： Stephen L. Wong , Sreeraman Venkitasubrahmanian
发明人： Stephen L. Wong , Sreeraman Venkitasubrahmanian
IPC分类号： G05F3/18 , G05F3/26 , G05F3/16 , G05F3/20
CPC分类号： G05F3/267 , Y10S323/907
摘要： A temperature-compensated voltage regulator includes a field effect transistor voltage buffer which receives a high-voltage input and provides a low-voltage output, and a voltage generator having a series connection of a zener diode and at least one p-n junction diode for generating a reference voltage. The voltage generator is coupled between the low-voltage output of the voltage buffer and the input of a current mirror, with the output of the current mirror being coupled to the gate electrode of the field effect transistor in the voltage buffer. Additionally, the output of the current mirror is coupled to the low-voltage output of the voltage buffer by a resistor. The resulting voltage regulator circuit features high performance in a simple, economical configuration.
摘要翻译：温度补偿电压调节器包括接收高电压输入并提供低电压输出的场效应晶体管电压缓冲器，以及具有齐纳二极管和至少一个pn结二极管的串联连接的电压发生器，用于产生参考电压。电压发生器耦合在电压缓冲器的低电压输出和电流镜的输入之间，电流镜的输出与电压缓冲器中的场效应晶体管的栅电极耦合。此外，电流镜的输出通过电阻耦合到电压缓冲器的低电压输出。所得到的稳压电路在简单，经济的配置中具有高性能。

10. 发明授权

US5272392A Current limited power semiconductor device 失效
标题翻译：电流限制功率半导体器件
公开(公告)号：US5272392A
公开(公告)日：1993-12-21
申请号：US987892
申请日：1992-12-04
申请人： Stephen L. Wong , Sreeraman Venkitasubrahmanian
发明人： Stephen L. Wong , Sreeraman Venkitasubrahmanian
IPC分类号： G05F3/24 , H02H7/00 , H02H9/02 , H03K17/06 , H03K17/082 , H03K17/14 , H03K3/01 , H03K3/26
CPC分类号： H03K17/063 , H03K17/0822 , H03K17/145
摘要： A current limit circuit for protection of an intelligent power switch includes a series circuit of a sense transistor and a sense resistor coupled to the power semiconductor transistor switch so that the sense resistor current is a fraction of, and is proportional to, the power transistor current. A pull-down transistor is coupled to the control electrode of the power transistor switch. A feedback circuit including a series connection of a diode-connected transistor and a reference V source is coupled between the sense resistor and the control electrode of the pull down transistor. The feedback circuit produces a voltage level shift and the circuit provides an accurate limit on the power transistor current independent of any variations in threshold voltage.
摘要翻译：用于保护智能功率开关的电流限制电路包括感测晶体管和耦合到功率半导体晶体管开关的检测电阻器的串联电路，使得检测电阻器电流是功率晶体管电流的一部分，并且与功率晶体管电流成比例。下拉晶体管耦合到功率晶体管开关的控制电极。包括二极管连接的晶体管和参考V源的串联连接的反馈电路耦合在检测电阻和下拉晶体管的控制电极之间。反馈电路产生电压电平偏移，并且电路提供功率晶体管电流的精确限制，与阈值电压的任何变化无关。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式