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    • 1. 发明申请
    • LED Control Method and Apparatus
    • LED控制方法和装置
    • US20150015149A1
    • 2015-01-15
    • US13939354
    • 2013-07-11
    • Zhijun Zhang
    • Zhijun Zhang
    • H05B33/08
    • H05B33/0821Y02B20/342Y02B20/348
    • An LED control circuit designed for providing stable voltage to LED loads, which is comprised of a bridge rectifier connected with the power supply, at least one LED branch circuit comprised of LED control units in series connection with a current-regulating element. Each LED control unit is comprised of a zener diode parallelly connected with LED working elements made of an LED and a serially connected current limiting resistor. The forward voltage drop of the zener diode closely approximates the desired working voltage of the LED loads, and thus each LED control unit plays the role of a voltage regulator. When voltage of an LED control unit is below the stabilized voltage of the zener diode, the brightness of LED is continuously adjustable. When an LED branch circuit is put under the control of a constant current control module, the current flowing through each LED can be stabilized.
    • 一种LED控制电路,设计用于向与LED电源连接的桥式整流器提供的LED负载提供稳定的电压,至少一个LED分支电路由与LED电流调节元件串联连接的LED控制单元组成。 每个LED控制单元包括与由LED组成的LED工作元件并联连接的齐纳二极管和串联连接的限流电阻器。 齐纳二极管的正向压降非常接近LED负载的所需工作电压,因此每个LED控制单元起到电压调节器的作用。 当LED控制单元的电压低于齐纳二极管的稳定电压时,LED的亮度可以连续调节。 当LED分支电路处于恒定电流控制模块的控制下时,流过每个LED的电流可以稳定。
    • 3. 发明授权
    • Antennas for handheld electronic devices
    • 手持电子设备天线
    • US08138977B2
    • 2012-03-20
    • US11890865
    • 2007-08-07
    • Zhijun ZhangFletcher R. RothkopfRobert W. SchlubRuben Caballero
    • Zhijun ZhangFletcher R. RothkopfRobert W. SchlubRuben Caballero
    • H01Q1/24
    • H01Q1/243H01Q1/36H01Q1/38H01Q9/0414H01Q9/42H01Q21/28
    • Handheld electronic devices are provided that contain wireless communications circuitry. The wireless communications circuitry may include antenna structures. An antenna may be located in an upper right corner of the handheld device as the handheld device is operated in a portrait mode. When the handheld device is rotated counterclockwise and operated in a landscape mode, the antenna is located in an unobstructed upper left corner of the device. The antenna may be formed from a strip of conductor. A proximal end of the strip of conductor may be connected to a transmission line. A distal end of the strip of conductor may be routed away from housing surfaces by bends formed in the strip. A printed circuit board in the handheld electronic device may have a hole. The distal end of the strip of conductor may be located adjacent to the hole.
    • 提供了包含无线通信电路的手持电子设备。 无线通信电路可以包括天线结构。 当手持设备以肖像模式操作时,天线可以位于手持设备的右上角。 当手持设备逆时针旋转并以横向模式操作时,天线位于设备的无障碍左上角。 天线可以由导体条形成。 导体条的近端可以连接到传输线。 导体条带的远端可以通过形成在条带中的弯曲而远离壳体表面。 手持电子设备中的印刷电路板可以具有孔。 导体条的远端可以位于邻近孔的位置。
    • 4. 发明授权
    • Multiband antenna for handheld electronic devices
    • 用于手持电子设备的多频带天线
    • US07768462B2
    • 2010-08-03
    • US11895053
    • 2007-08-22
    • Zhijun ZhangRobert W. SchlubRobert J. HillRuben Caballero
    • Zhijun ZhangRobert W. SchlubRobert J. HillRuben Caballero
    • H01Q1/24H01Q1/48
    • H01Q21/28H01Q1/243H01Q9/0457H01Q9/26H01Q13/106
    • A handheld electronic device is provided that contain wireless communications circuitry. The wireless communications circuitry may include antenna structures. A first antenna may handle first and second communications bands. A second antenna may handle additional communications bands. The first and second antennas may be located at opposite ends of the handheld electronic device. Conductive structures in the handheld electronic device may form an antenna ground plane. The antenna ground plane may have portions defining an antenna slot. An L-shaped antenna resonating element may be located adjacent to the slot. In the first communications band, the L-shaped antenna resonating element may serve as a non-radiating coupling stub that excites the antenna slot. In the second communications band, the L-shaped antenna resonating element may transmit and receive radio-frequency signals.
    • 提供了一种包含无线通信电路的手持式电子设备。 无线通信电路可以包括天线结构。 第一天线可以处理第一和第二通信频带。 第二天线可以处理额外的通信频带。 第一和第二天线可以位于手持电子设备的相对端。 手持电子设备中的导电结构可以形成天线接地平面。 天线接地平面可以具有限定天线槽的部分。 L形天线谐振元件可以位于与槽相邻的位置。 在第一通信频带中,L形天线谐振元件可以用作激发天线槽的非辐射耦合短线。 在第二通信频带中,L形天线谐振元件可以发射和接收射频信号。
    • 5. 发明授权
    • Tunable antennas for handheld devices
    • 手持设备的可调谐天线
    • US07671804B2
    • 2010-03-02
    • US11516433
    • 2006-09-05
    • Zhijun ZhangRuben Caballero
    • Zhijun ZhangRuben Caballero
    • H01Q1/38
    • H01Q1/243H01Q5/371H01Q9/0421H01Q9/0442
    • A compact tunable antenna for a handheld electronic device and methods for calibrating and using compact tunable antennas are provided. The antenna can have multiple ports. Each port can have an associated feed and ground. The antenna design can be implemented with a small footprint while covering a large bandwidth. The antenna can have a radiating element formed from a conductive structure such as a patch or helix. The antenna can be shaped to accommodate buttons and other components in the handheld device. The antenna may be connected to a printed circuit board in the handheld device using springs, pogo pins, and other suitable connecting structures. Radio-frequency switches and passive components such as duplexers and diplexers may be used to couple radio-frequency transceiver circuitry to the different feeds of the antenna. Antenna efficiency can be enhanced by avoiding the use of capacitive loading for antenna tuning.
    • 提供了一种用于手持电子设备的紧凑型可调谐天线以及用于校准和使用紧凑型可调谐天线的方法。 天线可以有多个端口。 每个端口可以具有相关联的馈电和接地。 天线设计可以实现小占地面积,同时覆盖大的带宽。 天线可以具有由诸如贴片或螺旋之类的导电结构形成的辐射元件。 天线可以被成形为容纳手持设备中的按钮和其他部件。 天线可以使用弹簧,弹簧针和其它合适的连接结构连接到手持设备中的印刷电路板。 可以使用射频开关和诸如双工器和双工器的无源组件来将射频收发器电路耦合到天线的不同馈送。 通过避免使用电容负载来天线调谐,可以提高天线效率。
    • 6. 发明授权
    • Method for implementing mobile number portability
    • US07082307B2
    • 2006-07-25
    • US10321256
    • 2002-12-17
    • Yabin ZhouJian LuoZhijun Zhang
    • Yabin ZhouJian LuoZhijun Zhang
    • H04Q7/22
    • H04W8/28
    • A scheme is provided for realizing Mobile Number Portability (MNP) by utilizing a signaling flow of prior mobile network standards such that no modification to the main apparatuses, such as VMSC, GMSC, and HLR, and the like, of the prior networks is required; only a NPDB+ apparatus is required and added, that is, a combination of NPDB and NPHLR. A user of Number portability from an original or home network to a second or other network will be a user of Number Portability out (NP out) among the users of the second network. The number section of the user belongs in the network, and it is able to assign a virtual roaming number to identify the situation of Number Portability (NP) of the user. A user of Number Portability from the second network to the home network is a user of Number Portability in (NP in) among the users of the home network. The NPDB+ apparatus is newly built to store the data of MNP mobile users who enter the home network and to accomplish the associated functions without any modification to the structure of the network. The distribution technology is used for storing the data of the NPDB+. The database is of high reliability such that the circuitous voice circuits do not existed, and the metering between the networks is easy. The newly added apparatus NPDB+ is superimposed on the prior networks, when there are less users during an early period, and only small amount of construction is required. The expansion of the capacity of the networks can be completed by adding portions of an apparatus based on the development condition of MNP services. The expansiveness of the networks is excellent, particularly, it is suitable for the mobile operating agents who have very large scale prior networks.