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    • 64. 发明专利
    • Automatic volume control
    • GB1125678A
    • 1968-08-28
    • GB582467
    • 1967-02-07
    • WILLIAM ROSS AIKEN
    • G05F1/12G05F1/44G05F1/652H03G1/00H03G3/20H03G3/30H03G7/06H03G11/02
    • 1,125,678. Automatic volume control. W. R. AIKEN. 7 Feb., 1967, No. 5824/67. Heading H4R. An automatic volume control arrangement 10 comprises a line 14 to which is applied an input such as a speech signal 42; a variable attenuator constituted by a fixed resistor 12 and a photo-sensitive resistor 16; an output line 20; a lamp 22 for illuminating the resistor 16; a power circuit for the lamp 22 including a transistor 24 which is regulated, in response to output variations, by a first control signal derived from the output line 20 by way of a potentiometer 30, a rectifier having a tansistor 32, and a line 33; and a circuit, including the series connection of a resistor 40 and a capacitor 40, from which is derived a second control signal of lesser value than the first, this second signal being held at the control transistor 24 for a predetermined duration upon decline of the said first control voltage. In operation, when the input signal increases suddenly the first control voltage likewise increases suddenly to cause transistor 24 to conduct strongly, whereby the brightness of the lamp rapidly increases and the output is attenuated; the control current surge also charges capacitor 36, but because of the presence of resistor 40, the capcitor voltage will not reach the magnitude of the first control voltage. After the output signal has dropped to its desired level, the initial surge of control current disappears, but the capacitor 36 then discharges and maintains a somewhat lower and gradually decreasing control voltage at the base of transistor 24 so that the flow of current through the lamp 22 is maintained for a limited time at the level required to hold the output within the desired limits, thereby preventing premature release of the control exercised on the input signal. A rheostat 26, is connected across the collector/emitter circuit of transistor 24 and is so adjusted that the lamp 22 is held on the threshold of illumination when no control signal is present on the base of the transistor.
    • 70. 发明公开
    • IMPROVED METHOD OF DETECTING SWITCHING POWER SUPPLY OUTPUT CURRENT
    • VERBESSERTES VERFAHREN ZUR ERKENNUNG DES AUSGANGSSTROMS EINES SCHALTNETZTEILS
    • EP1595189A4
    • 2010-11-24
    • EP04707758
    • 2004-02-03
    • JAM TECHNOLOGIES LLC
    • KIRN LARRY
    • G05F1/652G05F1/10G05F1/40G05F1/44G05F1/56G05F1/613G05F1/618G05F1/656G05F3/00G05F3/16H02M3/156H02M3/158
    • H02M3/156H02M2001/0009
    • A method and apparatus for detecting output current in switching power supplies forgoes the need for any resistor or other components in series with the load. A method according to the invention includes the steps of inferring the peak current through the inductor as a function of input voltage and inductor charge time, and deriving the current available to the load based upon the flyback voltage during discharge of the inductor. Although a disclosed example is based upon a buck/boost topology, other converter topologies are anticipated. In terms of apparatus, in a switching power supply of the type wherein a switching device is used to charge an inductor that discharges to a load, the invention provides devices arranged for detecting output current without the need for a resistor or other component in series with the load. In the preferred embodiment, these devices include electrical components operative to generate a signal indicative of peak inductor current, and a switch for switching the signal to provide a waveform, the integral of which is proportional to peak inductor current multiplied by the duty cycle of the discharge of the inductor. Circuitry is further used for comparing the waveform to a fixed reference so as to output a signal indicative of load current.
    • 用于检测开关电源中的输出电流的方法和装置禁止对负载串联的任何电阻器或其它部件的需要。 根据本发明的方法包括以下步骤:根据输入电压和电感器充电时间推断通过电感器的峰值电流,并且基于在电感器放电期间的反激电压导出可用于负载的电流。 虽然所公开的示例基于降压/升压拓扑,但是预期其它转换器拓扑。 在装置方面,在使用开关装置对放电到负载的电感器进行充电的开关电源中,本发明提供了用于检测输出电流而不需要电阻器或其它与 负载。 在优选实施例中,这些器件包括可用于产生指示峰值电感器电流的信号的电气部件,以及用于切换信号以提供波形的开关,该波形的积分与峰值电感器电流乘以乘法器的占空比成比例 电感放电。 电路进一步用于将波形与固定基准进行比较,以输出表示负载电流的信号。