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公开(公告)号：US4910439A
公开(公告)日：1990-03-20
申请号：US134498
申请日：1987-12-17
IPC分类号： H05B41/28
CPC分类号： H05B41/2806 , Y02B20/22
摘要： A high intensity discharge electrodeless lamp having a segmented excitation coil and capacitor configuration offers minimum light obstruction and RF losses while providing maximum impedance matching and heat transfer from the coil to a heat sink. The excitation coil includes at least two pairs of interconnected windings, each pair disposed concentrically in its own plane. The windings are clustered in a toroidal shape, the center of which is positioned to surround the arc envelope of a high intensity discharge lamp containing an ionizable gas activatable by RF energy. The coil windings are of large cross-sectional area and the capacitors have short leads, so as to minimize EMI and power losses and facilitate heat condition to heat sink means. The windings are configured to follow the contours of the magnetic field lines created by current flow through the total coil.
摘要翻译： 具有分段激励线圈和电容器配置的高强度放电无电极灯提供最小的光阻塞和RF损耗，同时提供最大阻抗匹配和从线圈到散热器的热传递。 励磁线圈包括至少两对互连绕组，每对绕组彼此同心地设置在其自身的平面内。 绕组聚集成环形形状，其中心定位成围绕包含可由RF能激发的可离子化气体的高强度放电灯的电弧包络。 线圈绕组的横截面积大，电容器具有短导线，从而将EMI和功率损耗降至最低，并有利于散热装置的加热条件。 绕组构造成跟随由流过整个线圈的电流产生的磁场线的轮廓。
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公开(公告)号：US6157276A
公开(公告)日：2000-12-05
申请号：US134764
申请日：1998-08-14
申请人： Robert Arvin Hedeen , William Alan Edelstein , Sayed-Amr El-Hamamsy , Kenneth Gordon Herd , Robert Adolph Ackermann
发明人： Robert Arvin Hedeen , William Alan Edelstein , Sayed-Amr El-Hamamsy , Kenneth Gordon Herd , Robert Adolph Ackermann
IPC分类号： A61B5/055 , G01R33/3815 , G01R33/385 , H01F6/00
CPC分类号： G01R33/3854 , G01R33/3815 , Y10S505/879 , Y10S505/893 , Y10S505/898
摘要： An MR magnet assembly includes a cylindrical vessel for housing a superconducting magnet and having a vacuum between its inner and outer walls. The vessel defines a magnet bore for receiving a patient to be imaged. A gradient coil assembly is mounted in the bore adjacent the inner wall of the magnet assembly. To reduce gradient coil noise, the inner wall is constructed of a non-conductive material which does not support eddy currents.
摘要翻译： MR磁体组件包括用于容纳超导磁体并且在其内壁和外壁之间具有真空的圆柱形容器。 容器限定用于接收待成像的患者的磁体孔。 梯度线圈组件安装在与磁体组件的内壁相邻的孔中。 为了减少梯度线圈噪声，内壁由不支持涡流的非导电材料构成。
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公开(公告)号：US5517086A
公开(公告)日：1996-05-14
申请号：US403087
申请日：1995-03-13
CPC分类号： H05B41/28
摘要： A modified valley fill circuit, including a main ballasting inductor for supplying an electrolytic capacitor, has an additional charging winding on the main ballasting inductor for charging the electrolytic capacitor to a predetermined voltage which maximizes the power factor of the input current by optimizing the conduction angle of the input current. In a discharge lamp ballast, the modified valley fill circuit reduces the lamp current crest factor by controlling the frequency with a lamp current control loop.
摘要翻译： 包括用于提供电解电容器的主要镇流电感器的改进的谷底填充电路在主镇流感应器上具有额外的充电绕组，用于将电解电容器充电到预定电压，其通过优化导通角来最大化输入电流的功率因数 的输入电流。 在放电灯镇流器中，通过用灯电流控制回路控制频率，改进的谷底填充电路降低灯电流波峰因数。
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公开(公告)号：US5463285A
公开(公告)日：1995-10-31
申请号：US209290
申请日：1994-03-14
申请人： Sayed-Amr El-Hamamsy
发明人： Sayed-Amr El-Hamamsy
CPC分类号： H05B41/2806 , H03J2200/10 , Y02B20/22 , Y10S315/04
摘要： The resolution .DELTA.C of a binary capacitance ladder having a plurality of N branches is precisely determined by appropriately selecting the value of a fixed capacitor in each branch relative to the parasitic capacitance of a corresponding series-connected switch. The capacitance of each respective branch varies by 2.sup.n-1 .DELTA.C, where n is the number of the branch, adjacent branches being numbered sequentially. The total capacitance is variable between C.sub.Total and C.sub.Total -(2.sup.N -1).DELTA.C in steps of .DELTA.C, where C.sub.Total is the sum of the capacitances in the ladder with all switches closed, and C.sub.Total -(2.sup.N -1).DELTA.C is the capacitance of the ladder with all switches open. For any particular branch of the ladder, the switch capacitance may be further controlled by adding a fixed capacitance in parallel with the respective switch. Such a variable capacitance is useful as a tuning capacitor in an electrodeless HID lamp ballast.
摘要翻译： 具有多个N个分支的二进制电容梯的分辨率DELTA C通过相对于相应的串联开关的寄生电容适当地选择每个分支中的固定电容器的值来精确地确定。 每个分支的电容变化为2n-1个DELTA，其中n是分支的数量，相邻的分支依次编号。 总共电容在DELTA C之间CTotal和CTotal-（2N-1）DELTA C之间是可变的，其中CTotal是梯形图中所有开关闭合的电容之和，CTotal-（2N-1）DELTA C 所有开关的梯子电容都开启。 对于梯子的任何特定分支，可以通过与相应开关并联地添加固定电容来进一步控制开关电容。 这种可变电容可用作无电极HID灯镇流器中的调谐电容器。
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15.发明授权
公开(公告)号：US5446350A
公开(公告)日：1995-08-29
申请号：US228826
申请日：1994-04-18
CPC分类号： H05B41/2806 , Y02B20/22
摘要： An impedance matching circuit for a self-oscillating electrodeless fluorescent lamp ballast of the type having an inductor connected in series with the parallel combination of a capacitor and the lamp's drive coil includes an additional capacitor connected in series with the drive coil. The capacitance value chosen for the additional capacitor is dependent on: stresses on the parallel capacitor; matching the impedance of the ballast; and the impact of the capacitor on the loaded coil phase angle. The additional capacitor reduces the phase angle presented to the ballast, thereby lowering the sensitivity of the ballast to component and lamp variations. In addition, the overall impedance of the network is reduced, such that the required inductance of the series inductor is reduced; hence, the inductor can have fewer turns and lower conduction losses. The current in inductor for the required power level is lower, resulting in a further reduction in conduction losses as well as a reduction in core losses due to lower flux in the core. Still further, a reduction of stresses on the inductor results in a reduced operating temperature, and hence increased efficiency, reliability and ballast life.
摘要翻译： 具有与电容器和灯的驱动线圈的并联组合串联的电感器的自振荡无电极荧光灯镇流器的阻抗匹配电路包括与驱动线圈串联连接的附加电容器。 为附加电容选择的电容值取决于：并联电容器上的应力; 匹配镇流器的阻抗; 以及电容对负载线圈相位角的影响。 额外的电容器可以降低镇流器的相位角，从而降低镇流器对零件和灯泡变化的灵敏度。 此外，网络的整体阻抗减小，使得串联电感器所需的电感减小; 因此，电感器可以具有较少的匝数和较低的传导损耗。 对于所需功率电平，电感中的电流较低，导致传导损耗进一步降低，以及由于芯中的较低通量引起的磁芯损耗的减小。 此外，电感器上的应力减小导致工作温度降低，因此提高了效率，可靠性和镇流器寿命。
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公开(公告)号：US5012161A
公开(公告)日：1991-04-30
申请号：US295624
申请日：1989-01-05
CPC分类号： H02M1/425 , H05B41/28 , H02M2001/4275 , Y02B70/126
摘要： A power factor correction circuit employs a metal oxide varistor in series with a filter capacitor. The varistor provides a low-impedance path for pre-charging the filter capacitor, thus enabling the avoidance of high inrush current to circuit devices, while the filter capacitor energizes the circuit when the capacitor voltage exceeds the AC source voltage. The circuit is insensitive to normal line transients. One application is for use in a gas discharge lamp ballast.
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公开(公告)号：US09128202B2
公开(公告)日：2015-09-08
申请号：US12107719
申请日：2008-04-22
IPC分类号： G01V1/22
CPC分类号： G01V1/223
摘要： A method of collecting data from wireless sensor units arranged in a network. The method may comprise the steps of initiating distribution of control signals to the wireless sensor units, acquiring data with the wireless sensor units by sensing one or more physical parameters, each of the wireless sensor units transmitting the acquired data in response to the control signals; and each of the wireless sensor units transmitting of at least a portion of the acquired data according to a prioritizing algorithm associated with each respective wireless sensor unit.
摘要翻译： 从布置在网络中的无线传感器单元收集数据的方法。 该方法可以包括以下步骤：启动向无线传感器单元分配控制信号，通过感测一个或多个物理参数与无线传感器单元获取数据，每个无线传感器单元响应于控制信号发送所获取的数据; 并且所述无线传感器单元中的每一个根据与每个相应无线传感器单元相关联的优先级算法来发送所获取的数据的至少一部分。
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公开(公告)号：US08217803B2
公开(公告)日：2012-07-10
申请号：US12107735
申请日：2008-04-22
IPC分类号： G08C19/16
CPC分类号： G01V1/223
摘要： A wireless network is provided, that may comprise wireless sensor units organized in chains of wireless sensor units. Each wireless sensor unit may comprise plural sensors and at least a wireless transceiver connected to communicate by wires or wirelessly with the plural sensors. Each chain of wireless sensor units may include a terminal wireless sensor unit and intermediate wireless sensor units, each intermediate wireless sensor unit being configured to relay data along the chain of intermediate wireless sensor units towards the terminal wireless sensor unit. The terminal wireless sensor unit in each chain of wireless sensor units is adapted to communicate wirelessly with at least one backhaul unit of plural backhaul units; and the backhaul units are adapted to communicate with a central computer.
摘要翻译： 提供无线网络，其可以包括以无线传感器单元链为单位组织的无线传感器单元。 每个无线传感器单元可以包括多个传感器和至少一个无线收发器，该无线收发器被连接以通过电线或与多个传感器无线地通信 每个无线传感器单元链可以包括终端无线传感器单元和中间无线传感器单元，每个中间无线传感器单元被配置为沿着中间无线传感器单元链向数据终端无线传感器单元中继数据。 无线传感器单元链中的终端无线传感器单元适于与多个回程单元的至少一个回程单元进行无线通信; 并且回程单元适于与中央计算机通信。
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公开(公告)号：US5488269A
公开(公告)日：1996-01-30
申请号：US386572
申请日：1995-02-10
IPC分类号： H05B41/24 , H02J3/18 , H02M1/00 , H02M1/42 , H02M3/155 , H02M7/12 , H02M7/217 , H05B41/28 , H05B41/282 , G05F1/00
CPC分类号： H02M1/4241 , H05B41/28 , Y02B70/126
摘要： A multi-resonant boost power factor correction circuit includes a full-wave rectifier; a high frequency filter capacitance coupled across the input terminals of the full-wave rectifier; a series half-bridge converter; a diode connected between the output of the rectifier and the dc bus voltage such that its cathode is connected to a dc bus; a capacitance coupled between the output of the rectifier and the junction between the series-connected switching devices of the half-bridge converter; a resonant load circuit connected to the junction between the switching devices, including a resonant inductor, a resonant capacitor and a load, such as a fluorescent discharge lamp; and a driver circuit for alternately switching the switching devices via a dead time control for selecting a dead time after one of the devices switches off and the other device switches on. The multi-resonant boost high power factor circuit meets the IEC standard for low harmonic content on input current, thus operating with a very high power factor, and operates with a minimal number of circuit components. In addition, the circuit meets lamp current crest factor specifications for fluorescent discharge lamp ballasts and requires lower voltage power devices.
摘要翻译： 多谐振升压功率因数校正电路包括全波整流器; 耦合在全波整流器的输入端上的高频滤波电容; 一系列半桥转换器; 连接在整流器的输出端和直流母线电压之间的二极管，使得其阴极连接到直流总线; 耦合在整流器的输出端和半桥转换器的串联连接的开关器件之间的接点之间的电容; 连接到开关器件之间的连接处的谐振负载电路，包括谐振电感器，谐振电容器和诸如荧光放电灯的负载; 以及驱动电路，用于经由死区时间控制交替切换开关装置，用于在所述装置中的一个关闭并且另一装置接通之后选择死区时间。 多谐振升压高功率因数电路符合IEC标准，用于低谐波含量的输入电流，因此以非常高的功率因数运行，并以最少数量的电路组件运行。 此外，该电路符合荧光放电灯镇流器的灯电流峰值因数规格，并且需要较低电压的功率器件。
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公开(公告)号：US5481161A
公开(公告)日：1996-01-02
申请号：US386570
申请日：1995-02-10
IPC分类号： H05B41/392 , H05B37/02
CPC分类号： H05B41/3925
摘要： A fixed duty ratio, variable frequency, square wave generator includes an astable multivibrator having a pair of resistors coupled in series between a supply voltage terminal and a capacitor, such as of a type implemented with a 555 timer, and further includes a JFET connected between the capacitor and ground. In a current-controlled version, the anode of a diode is connected to the gate of the JFET, and the cathode of the diode is connected to a sensing resistor for sensing current in a load. The multivibrator generates a ramp voltage across the capacitor which varies between predetermined fractions of the supply voltage with a fixed duty ratio. The capacitor of the multivibrator charges and discharges through the series connection of the resistors and the JFET channel resistance with charging and discharging times that vary with the input voltage to the JFET, thereby varying the generator frequency.
摘要翻译： 固定占空比，可变频率，方波发生器包括具有串联耦合在电源电压端子和电容器之间的一对电阻器的非稳态多谐振荡器，例如由555定时器实现的类型，并且还包括JFET， 电容器和地。 在电流控制版本中，二极管的阳极连接到JFET的栅极，二极管的阴极连接到感测电阻器，用于感测负载中的电流。 多谐振荡器产生电容器两端的斜坡电压，该斜坡电压在电源电压的预定分数与固定占空比之间变化。 多谐振荡器的电容器通过电阻器的串联连接和JFET通道电阻进行充电和放电，充电和放电时间随JFET的输入电压而变化，从而改变发生器频率。
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