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1. 发明授权

US06977648B1 System and method for providing back-lighting to a keypad 有权
标题翻译：用于向小键盘提供背光的系统和方法
公开(公告)号：US06977648B1
公开(公告)日：2005-12-20
申请号：US09182626
申请日：1998-10-29
申请人： David E. Wang , Mahmoud Azartash , Larry D. Bradley , Richard J. Kerr
发明人： David E. Wang , Mahmoud Azartash , Larry D. Bradley , Richard J. Kerr
IPC分类号： G09G5/00 , H04M1/02 , H04M1/22
CPC分类号： H04M1/22 , H04M1/0214 , H04M1/23
摘要： A system for providing a first signal to a flip circuit and receiving a second signal from the flip circuit over an electrical path adapted for use with a keypad having a keypad lighting circuit. The system includes a first circuit for providing the first signal to the flip circuit via a first electrical path, the first signal having alternating first and second states. A second circuit generates a second signal. A third circuit receives the second signal via the first electrical path. The second signal is received during the second state of the first signal. In a more specific embodiment, the first and second states are continuously alternating states. The first signal provides power to the flip circuit when the first signal is in the first state. The first circuit further includes a signal generator for adjusting a duty cycle of the first signal. The signal generator includes a voltage source, a switching circuit connected to the voltage source, and a control circuit connected to the switching circuit. The control circuit causes the switching circuit to output the first signal having first and second states at the duty cycle. The switching circuit includes a transistor having a control terminal connected to the control circuit. One terminal is connected to the voltage source and another terminal is connected to the electrical path. The second circuit includes a keypad. The flip circuit includes at least one light source to illuminate the keypad. The light source is powered by the first signal during the first state thereof. The second signal is generated by the keypad during the second state of the first signal. The keypad includes a plurality of resistive elements connected in a resistive ladder network. Each resistive element corresponds to a respective key of the keypad. A computer processes the second signal to ascertain which key is depressed.
摘要翻译：一种用于向倒装电路提供第一信号并通过适于与具有键盘照明电路的键盘一起使用的电气路径从翻盖电路接收第二信号的系统。该系统包括用于经由第一电路向第一信号提供第一信号的第一电路，第一信号具有交替的第一和第二状态。第二电路产生第二信号。第三电路经由第一电路接收第二信号。在第一信号的第二状态期间接收第二信号。在更具体的实施例中，第一和第二状态是连续交替状态。当第一信号处于第一状态时，第一信号向翻盖电路供电。第一电路还包括用于调整第一信号的占空比的信号发生器。信号发生器包括电压源，连接到电压源的开关电路和连接到开关电路的控制电路。控制电路使开关电路以占空比输出具有第一和第二状态的第一信号。开关电路包括具有连接到控制电路的控制端子的晶体管。一个端子连接到电压源，另一个端子连接到电气路径。第二电路包括键盘。翻盖电路包括至少一个照明键盘的光源。光源在其第一状态期间由第一信号供电。在第一信号的第二状态期间，第二信号由键盘产生。键盘包括连接在电阻梯形网络中的多个电阻元件。每个电阻元件对应于键盘的相应键。计算机处理第二信号以确定哪个键被按下。

2. 发明授权

US06765370B2 System and method for bi-directional power conversion in a portable device 失效
标题翻译：用于便携式设备中的双向电力转换的系统和方法
公开(公告)号：US06765370B2
公开(公告)日：2004-07-20
申请号：US10150302
申请日：2002-05-17
申请人： Larry D. Bradley
发明人： Larry D. Bradley
IPC分类号： G05F1652
CPC分类号： H02M3/1582 , H02J7/00
摘要： A system and a method are provided for bi-directional power conversion in a portable device. The system uses a single inductor to perform both buck and boost power conversion operations and a controller to supply signals to two switches, enabling electric current paths. The system includes a battery connected to ground and to an inductor terminal. The first switch has a terminal connected to a portable device power bus, a second terminal connected to a second inductor terminal, and an input to accept a control signal. The second switch has a terminal connected to the second inductor terminal, a second terminal connected to a portable device ground, and an input to accept a control signal. Controller inputs accept the bus voltage and the battery voltage and outputs supply power conversion control signals to the switches in response to evaluating the bus and battery voltages. The controller supplies buck power conversion control signals to: close the first switch and open the second switch to build up voltage across the inductor to reduce the voltage supplied to the battery by an external power supply connected to the bus; and to open the first switch and close the second switch to discharge the inductor built-up voltage to the battery. The controller supplies boost power conversion control signals to open the first switch and close the second switch to build up voltage across the inductor and to close the first switch and open the second switch to add the inductor built-up voltage to the voltage supplied by the battery to the bus.
摘要翻译：提供了一种用于便携式设备中的双向电力转换的系统和方法。该系统使用单个电感器执行降压和升压功率转换操作，以及控制器向两个开关提供信号，从而实现电流通路。该系统包括连接到地和连接到电感器端子的电池。第一开关具有连接到便携式设备电源总线的端子，连接到第二电感器端子的第二端子和接受控制信号的输入端。第二开关具有连接到第二电感器端子的端子，连接到便携式设备地的第二端子和接受控制信号的输入端。响应评估总线和电池电压，控制器输入接受总线电压和电池电压，并向开关输出电源电源转换控制信号。控制器提供降压功率转换控制信号：关闭第一个开关并打开第二个开关，以在整个电感上建立电压，以减少由连接到总线的外部电源提供给电池的电压; 并打开第一个开关并关闭第二个开关，以将电感器累积电压放电到电池。控制器提供升压功率转换控制信号以打开第一开关并闭合第二开关以在整个电感器上建立电压并闭合第一开关并打开第二开关以将电感器累积电压加到由电池到公车。

3. 发明授权

US6031362A Method and apparatus for feedback control of switch mode power supply output to linear regulators 有权
标题翻译：用于反馈控制开关模式电源输出到线性稳压器的方法和装置
公开(公告)号：US6031362A
公开(公告)日：2000-02-29
申请号：US311759
申请日：1999-05-13
申请人： Larry D. Bradley
发明人： Larry D. Bradley
IPC分类号： G05F1/577 , H02M3/335 , G05F1/40
CPC分类号： H02M3/33561 , G05F1/577
摘要： A method and apparatus for using feedback to control the output voltage of a Switch Mode Power Supply (SMPS) that is used as the input voltage to subsequent Low Drop Out (LDO) linear voltage regulators. A multiplexer and Analog to Digital Converter (ADC) are used to successively sample the output voltages of multiple parallel LDO regulators. The digitized voltage values are input to a digital processor that compares the LDO regulator output voltages with acceptable limits previously stored in memory. The digitized voltage values are used by the digital processor to control the output voltage of a SMPS that is used as the input voltage to the LDO regulators. The output voltage of the SMPS, and thus the input of the LDO regulators, is reduced to the minimum value that retains full performance of the LDO regulators. Operating each LDO regulator at full regulation ensures full performance of the LDO regulators. Minimizing the input voltage to the LDO regulators maximizes the efficiency of the total power supply. When integrated into a battery powered cellular phone, the invention maximizes efficiency thereby maximizing telephone talk time and standby time.
摘要翻译：一种使用反馈来控制开关模式电源（SMPS）的输出电压的方法和装置，该开关模式电源用作随后的低压降（LDO）线性稳压器的输入电压。多路复用器和模数转换器（ADC）用于连续采样多个并联LDO稳压器的输出电压。数字化电压值被输入到数字处理器，其将LDO调节器输出电压与先前存储在存储器中的可接受限制进行比较。数字化电压值由数字处理器用于控制用作LDO稳压器的输入电压的SMPS的输出电压。 SMPS的输出电压以及LDO稳压器的输入降低到保持LDO稳压器全面性能的最小值。在每个LDO调节器全面运行的情况下，可以确保LDO稳压器的全面性能。将LDO稳压器的输入电压降至最低，从而最大限度地提高总电源的效率。当集成到电池供电的蜂窝电话中时，本发明使效率最大化，从而最大化电话通话时间和待机时间。

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