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    • 72. 发明申请
    • Methods and apparatuses for operating devices with solar power
    • 用于操作具有太阳能发电装置的方法和装置
    • US20080084117A1
    • 2008-04-10
    • US11544103
    • 2006-10-06
    • Wendell B. SanderDaniel A. WarrenAaron Leiba
    • Wendell B. SanderDaniel A. WarrenAaron Leiba
    • H02J3/32
    • H02J7/35H02J3/385Y10T307/516
    • Solar power tracking techniques are described herein. In one aspect of the invention, a solar power tracking apparatus includes, but is not limited to, a voltage converter and a controller coupled to the voltage converter. The voltage converter includes an input capable of being coupled to a solar power source and an output capable of being coupled to an electronic load, such as, for example, a portable electronic device. The voltage converter is configured to monitor or detect an amount of power drawn by the electronic load at the output of the voltage converter. In response to the monitored power drawn, the controller is configured to control the voltage converter to reduce amount of power to be drawn subsequently if the monitored amount of power exceeds a predetermined threshold. As a result, the output voltage from the solar power source is maintained within a predetermined range. Other methods and apparatuses are also described.
    • 本文描述了太阳能跟踪技术。 在本发明的一个方面,一种太阳能发电跟踪装置包括但不限于与电压转换器耦合的电压转换器和控制器。 电压转换器包括能够耦合到太阳能电源的输入端和能够耦合到例如便携式电子设备的电子负载的输出端。 电压转换器被配置为监视或检测在电压转换器的输出处由电子负载拉出的功率量。 响应于所监视的电力消耗,控制器被配置为如果监视的功率量超过预定阈值,则控制电压转换器以减少随后抽取的功率量。 结果,来自太阳能电源的输出电压保持在预定范围内。 还描述了其它方法和装置。
    • 73. 发明授权
    • Efficient, precise RF modulation using multiple amplifier stages
    • 使用多个放大器级的高效,精确的RF调制
    • US06690233B2
    • 2004-02-10
    • US09746530
    • 2000-12-21
    • Wendell B. Sander
    • Wendell B. Sander
    • H03F368
    • H03C5/00H03F1/0222H03F1/0294
    • The present invention, generally speaking, provides a highly efficient RF power amplifier having a large output dynamic range. The amplifier avoid the large power dissipation that occurs in the LINC combiner at lower output levels. In general, this is achieved by using power-controlled switch-mode power amplifiers to vary output power at large power outputs, and reverting to LINC only at low output powers. Thus the present invention achieves the desirable combination of high efficiency at all output powers, while maintaining the fine output power control of the LINC method. More particularly, the power amplifier is based on a highly efficient structure in which amplitude modulation/power control of the output of an RF amplifier is achieved by operating the amplifier in switch mode and varying the power supply of the amplifier, as described more fully in U.S. patent application Ser. No. 09/637,269 entitled High-Efficiency Modulating RF Amplifier, filed Aug. 10, 2000 and incorporated herein by reference. Such an amplifier behaves quite linearly at high power but may exhibit non-linearity at lower output powers. Good linearity throughout a wide dynamic range, and particularly at low output power, may be achieved by phasing and combining the outputs of two (or more) such amplifiers. At high and medium power, the outputs are combined in-phase, allowing for low-loss, high-efficiency operation. At low power, the outputs are phased such that power subtraction occurs. In this manner, each amplifier may be operated at a power level that exhibits good linearity while producing an output signal of a lower power level that would normally fall within a region of substantial non-linearity.
    • 本发明一般地提供了具有大输出动态范围的高效RF功率放大器。 放大器避免了LINC组合器在较低输出电平下发生的大功耗。 一般来说,这是通过使用功率控制开关模式功率放大器来改变大功率输出的输出功率而实现的,并且仅在低输出功率下才能还原到LINC。 因此,在保持LINC​​方法的精细输出功率控制的同时,本发明在所有输出功率下实现了高效率的期望组合。 更具体地,功率放大器基于高效率的结构,其中通过以开关模式操作放大器并改变放大器的电源来实现RF放大器的输出的幅度调制/功率控制,如下文更全面地描述的 美国专利申请 2000年8月10日提交的题为“高效率调制RF放大器”的No.09 / 637,269,并入本文作为参考。 这种放大器在高功率下行为相当线性,但是在较低的输出功率下可能呈现非线性。 可以通过两个(或多个)这样的放大器的输出相位和组合来实现在宽动态范围内,特别是在低输出功率下的良好线性度。 在高功率和中等功率下,输出同相并联,允许低损耗,高效率的操作。 在低功率时,输出被分阶段实现功率相减。 以这种方式,每个放大器可以以显示良好线性度的功率电平工作,同时产生通常落在基本非线性区域内的较低功率电平的输出信号。
    • 74. 发明授权
    • PLL bandwidth switching
    • US06580329B2
    • 2003-06-17
    • US09834247
    • 2001-04-11
    • Wendell B. Sander
    • Wendell B. Sander
    • H03L785
    • H03L7/107H03L7/0898H03L7/10H03L7/1072
    • The present invention, generally speaking, provides for bandwidth switching of a PLL in a simple, effective manner. In accordance with one embodiment, a phase lock loop includes a controlled oscillator responsive to a control voltage for producing an output signal of some output frequency; a comparator responsive to a feedback signal derived from the output signal and to a reference signal for producing at least one error signal; a charge pump circuit including multiple pairs of unidirectional current sources (or, alternatively, multiple bidirectional current sources); a control circuit responsive to a control signal for activating one or more pairs of unidirectional current sources, at the same time deactivating one or more pairs of unidirectional current sources; and a loop filter responsive to the multiple pairs of unidirectional current sources for producing the control voltage governing the output frequency. In accordance with another embodiment of the invention, a phase lock loop includes a controlled oscillator responsive to a control voltage for producing an output signal of some output frequency; a comparator responsive to a feedback signal derived from the output signal and to a reference signal for producing at least one error signal; a charge pump circuit coupled to a loop filter at at least one circuit node, the loop filter being responsive to at least the charge pump circuit for producing the control voltage; a logic driver coupled to said circuit node through a resistor; and a control circuit responsive to at least one control signal for controlling a state of the logic driver. Preferably, the logic driver is a tri-state device.