公开(公告)号：US08803617B2

公开(公告)日：2014-08-12

申请号：US13598251

申请日：2012-08-29

申请人： Jin Liang ,  David Grant ,  Larry Wofford

发明人： Jin Liang ,  David Grant ,  Larry Wofford

IPC分类号： H03K3/03

CPC分类号： H03K3/0322

摘要： Oscillator circuitry having a switching inverting amplifier arranged in a ring oscillator configuration of at least two stages. A bias generator for supplying the amplifiers of neighboring stages, is responsive to an enable signal to supply the amplifiers only when the enable signal is asserted. A first pair of transistors, coupled to an input of one of the amplifiers and the other coupled to an output of the amplifier, the transistors being driven in common by the enable signal such that when the enable signal is deasserted the transistors of the pair are turned on to impose conflicting levels at the input and the output such that the amplifier is forced to switch.

摘要翻译： 振荡器电路具有以至少两级的环形振荡器配置布置的开关反相放大器。 用于提供相邻级的放大器的偏置发生器仅在使能信号被断言时响应于使能信号来提供放大器。 第一对晶体管，耦合到放大器之一的输入端，另一个耦合到放大器的输出端，晶体管由使能信号共同驱动，使得当使能信号被置为无效时，该对晶体管是 打开在输入和输出上施加相冲突的电平，使得放大器被迫切换。

公开(公告)号：US20130057352A1

公开(公告)日：2013-03-07

申请号：US13598251

申请日：2012-08-29

申请人： Jin Liang ,  David Grant ,  Larry Wofford

发明人： Jin Liang ,  David Grant ,  Larry Wofford

IPC分类号： H03K3/03

CPC分类号： H03K3/0322

摘要： Oscillator circuitry having a switching inverting amplifier arranged in a ring oscillator configuration of at least two stages. A bias generator for supplying the amplifiers of neighboring stages, is responsive to an enable signal to supply the amplifiers only when the enable signal is asserted. A first pair of transistors, coupled to an input of one of the amplifiers and the other coupled to an output of the amplifier, the transistors being driven in common by the enable signal such that when the enable signal is deasserted the transistors of the pair are turned on to impose conflicting levels at the input and the output such that the amplifier is forced to switch.

摘要翻译： 振荡器电路具有以至少两级的环形振荡器配置布置的开关反相放大器。 用于提供相邻级的放大器的偏置发生器仅在使能信号被断言时响应于使能信号来提供放大器。 第一对晶体管，耦合到放大器之一的输入端，另一个耦合到放大器的输出端，晶体管由使能信号共同驱动，使得当使能信号被置为无效时，该对晶体管是 打开在输入和输出上施加相冲突的电平，使得放大器被迫切换。

公开(公告)号：US5581170A

公开(公告)日：1996-12-03

申请号：US512309

申请日：1995-08-08

申请人： Robert A. Mammano ,  Larry Wofford ,  Winthrop H. McClure ,  Burt L. Price

发明人： Robert A. Mammano ,  Larry Wofford ,  Winthrop H. McClure ,  Burt L. Price

IPC分类号： H02J7/00

CPC分类号： H02J7/0019

摘要： A battery protector for providing overvoltage and undervoltage protection to one or more series-connected cells. The battery protector includes a voltage detection and comparison circuit, providing an overvoltage signal indicative of whether the voltage across any of the cells is greater than an overvoltage threshold level and an undervoltage signal indicative of whether the voltage across any of the cells is less than an undervoltage threshold level, and a switch connected in series with the current path between the cells and a charger and/or load. In one embodiment, the switch is a four-terminal FET and a bias control circuit is provided for selectively connecting the body region of the FET to ensure that current does not flow through the parasitic FET diodes. A second control circuit responsive to the overvoltage and undervoltage signals controls conduction of the switch, causing the switch to close if any of the following conditions occur: (1) the overvoltage and undervoltage signals do not indicate an overvoltage or undervoltage condition, respectively; (2) the overvoltage signal indicates an overvoltage condition, but the cells are attempting to discharge; or (3) the undervoltage signal indicates an undervoltage condition, but the charger is attempting to charge the cells.

摘要翻译： 用于向一个或多个串联电池提供过压和欠压保护的电池保护器。 电池保护器包括电压检测和比较电路，提供指示跨过任何单元的电压是否大于过电压阈值电平的过电压信号，以及指示跨过任何单元的电压是否小于 欠压阈值电平，以及与电池与充电器和/或负载之间的电流路径串联连接的开关。 在一个实施例中，开关是四端子FET，并且提供偏置控制电路用于选择性地连接FET的体区，以确保电流不流过寄生FET二极管。 响应于过电压和欠压信号的第二控制电路控制开关的导通，如果出现以下情况，则开关闭合：（1）过电压和欠压信号分别不表示过压或欠压状态; （2）过电压信号表示过压状态，但电池正试图放电; 或（3）欠压信号表示欠电压状态，但充电器正试图对电池充电。

公开(公告)号：US6150714A

公开(公告)日：2000-11-21

申请号：US157284

申请日：1998-09-18

申请人： William M. Andreycak ,  Robert Monroe ,  Chuck Payne ,  Larry Wofford

发明人： William M. Andreycak ,  Robert Monroe ,  Chuck Payne ,  Larry Wofford

IPC分类号： H01L23/495 ,  H01L23/48

CPC分类号： H01L23/495 ,  H01L2224/05554 ,  H01L2224/05599 ,  H01L2224/48247 ,  H01L2224/49171 ,  H01L2224/85399 ,  H01L24/48 ,  H01L24/49 ,  H01L2924/00014 ,  H01L2924/01037 ,  H01L2924/14 ,  H01L2924/30107 ,  H01L2924/3011

摘要： An electronic device includes a conductive member disposed within an insulative package. The conductive member is formed from a lead frame used to form the interconnection pins for the device. The conductive member includes an elongated, folded sense element portion having a known resistance. The sense element portion is disposed between two sets of conductive lead portions extending from the conductive member forming pins used to provide a current to the device for sensing. An integrated circuit disposed within the package includes a differential amplifier having differential inputs connected to bond pads on the integrated circuit. The bond pads are connected to spaced-apart tap points of the sense element via conductive bond wires, so that the combination of the sense element and the differential amplifier forms a trans-impedance amplifier. The gain of the differential amplifier is controlled to be proportional to the magnitude of a reference voltage generated by a bandgap voltage reference circuit. The reference voltage varies with temperature such that the overall gain of the trans-impedance amplifier is constant over temperature. The nominal gain of the differential amplifier is established by an on-chip resistance, which is trimmed using fuse-programmable trim cells that are programmed via operational package pins during a pre-operation trim procedure.

摘要翻译： 电子设备包括设置在绝缘封装内的导电构件。 导电构件由用于形成用于器件的互连引脚的引线框架形成。 导电构件包括具有已知电阻的细长折叠的感测元件部分。 感测元件部分设置在两个导电引线部分之间，这两组导电部分从导电部件形成用的引脚延伸，用于向该器件提供电流以进行感测。 布置在封装内的集成电路包括差分放大器，其差分输入连接到集成电路上的接合焊盘。 接合焊盘通过导电接合线连接到感测元件的间隔开的抽头点，使得感测元件和差分放大器的组合形成跨阻抗放大器。 差分放大器的增益被控制成与由带隙电压参考电路产生的参考电压的幅度成比例。 参考电压随温度变化，使得跨阻放大器的总体增益在温度范围内是恒定的。 差分放大器的额定增益由片内电阻建立，片上电阻使用在预操作调整过程中通过操作封装引脚编程的熔丝可编程微调单元进行修整。

公开(公告)号：US20050018453A1

公开(公告)日：2005-01-27

申请号：US10625265

申请日：2003-07-23

申请人： Larry Wofford ,  Michael Madigan ,  Thomas Mathes

发明人： Larry Wofford ,  Michael Madigan ,  Thomas Mathes

IPC分类号： H02M1/00 ,  H02M1/12 ,  H02M1/32

CPC分类号： H02M1/32 ,  H02M2001/0022 ,  H02M2001/0025

摘要： A system and method are disclosed to limit a maximum duty cycle and/or provide a volt-second clamp for a pulse-width modulated (PWM) signal. Depending on the circuit topology, this approach can limit the absolute duty cycle or operate as a volt-second clamp in which the duty cycle is limited as a function of a variable input control voltage, such as a line voltage. The duty cycle can be selectively programmed by setting one or more external reference components, such as one or more respective resistors. Additionally, through component matching, desired clamping can be achieved with a high level of accuracy.

摘要翻译： 公开了限制最大占空比的系统和方法和/或为脉冲宽度调制（PWM）信号提供伏秒钳位。 根据电路拓扑结构，该方法可以限制绝对占空比或作为伏特钳位操作，其中占空比受到可变输入控制电压（如线路电压）的函数的限制。 可以通过设置一个或多个外部参考组件（例如一个或多个相应电阻器）来选择性地编程占空比。 另外，通过部件匹配，可以以高精度实现期望的夹紧。

公开(公告)号：US06433514B1

公开(公告)日：2002-08-13

申请号：US09678545

申请日：2000-10-04

申请人： Winthrop H. McClure ,  Roman Korsunsky ,  Larry Wofford

发明人： Winthrop H. McClure ,  Roman Korsunsky ,  Larry Wofford

IPC分类号： H02J700

CPC分类号： H01M10/4257 ,  H01M10/0525 ,  H01M10/48 ,  H02J7/0029

摘要： A battery protection circuit includes a moisture detection circuit, a temperature sensing circuit, and a high-temperature battery discharge circuit. The moisture detection circuit includes a pair of conductive traces closely spaced on a substrate such that a resistive path is formed between the traces when moisture forms on the substrate. The traces are connected between the positive battery terminal and a pull-down current source. When moisture forms on the substrate, pull-up current flows between the traces, and a resulting voltage change on one of the traces is detected by circuit element such as a logic inverter. The temperature sensing circuit includes a voltage reference circuit that generates a proportional-to-temperature voltage and temperature-independent voltage reference signals corresponding to various predetermined temperatures. A measuring circuit operates during a sampling interval to compare each temperature-dependent voltage to the proportional-to-temperature voltage and to store the result of each comparison until a subsequent temperature sampling interval. The measuring circuit includes multiplexing circuitry used to sequentially select each temperature-dependent voltage during a sampling interval. The high-temperature discharge circuit connects a discharge load across the battery when the voltage of the battery is above a high voltage threshold and the temperature of the battery is above the high temperature threshold. When no external charger is active, the discharge current flowing through this load works to reduce battery voltage. helping to prolong battery life.

摘要翻译： 电池保护电路包括湿度检测电路，温度检测电路和高温电池放电电路。 水分检测电路包括在衬底上紧密间隔开的一对导电迹线，使得当在衬底上形成湿气时，在迹线之间形成电阻路径。 迹线连接在正电池端子和下拉电流源之间。 当衬底上形成湿气时，上拉电流在迹线之间流动，并且其中一条迹线上产生的电压变化由诸如逻辑反相器的电路元件检测。 温度检测电路包括产生与各种预定温度相对应的比例温度电压和与温度无关的电压参考信号的电压参考电路。 测量电路在采样间隔期间运行，以将每个温度相关电压与比例温度电压进行比较，并将每个比较的结果存储到随后的温度采样间隔。 测量电路包括用于在采样间隔期间依次选择每个温度依赖电压的多路复用电路。 当电池的电压高于高电压阈值并且电池的温度高于高温阈值时，高温放电电路将电池的放电负载连接在电池两端。 当没有外部充电器有效时，流经该负载的放电电流可以降低电池电压。 有助于延长电池寿命。

公开(公告)号：US5414342A

公开(公告)日：1995-05-09

申请号：US054843

申请日：1993-04-29

申请人： Robert A. Mammano ,  Larry Wofford

发明人： Robert A. Mammano ,  Larry Wofford

IPC分类号： H02M3/335 ,  G05F1/44

CPC分类号： H02M3/33507

摘要： A pulse width modulator voltage feedforward circuit which includes a gating circuit for providing a control signal to a charge circuit which charges an integration circuit with a current proportional to an input voltage. The integration circuit provides an output ramp signal waveform having a slope proportional to the input voltage value. The gating circuit also provide a control signal to a discharge circuit, to thus alternately charge and discharge the integration circuit. The gating circuit insures that a minimum deadtime for a transformer reset will occur regardless of input voltage variations by preventing a fixed frequency signal provided by an oscillator from beginning a new ramp waveform signal period until the integration circuit is discharged to a minimum reference voltage level.

摘要翻译： 一种脉宽调制器电压前馈电路，其包括用于向充电电路提供控制信号的选通电路，该充电电路以与输入电压成正比的电流对积分电路充电。 积分电路提供具有与输入电压值成比例的斜率的输出斜坡信号波形。 选通电路还向放电电路提供控制信号，从而交替地对积分电路进行充电和放电。 选通电路确保通过防止振荡器提供的固定频率信号开始新的斜坡波形信号周期，直到积分电路放电到最小参考电压电平，无论输入电压变化如何，都会发生变压器复位的最小死区时间。