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2. 发明授权

US4096542A Controller for video tape recorder 失效
标题翻译：录像机控制器
公开(公告)号：US4096542A
公开(公告)日：1978-06-20
申请号：US781611
申请日：1977-03-28
申请人： Frank Pappas , John L. Rennick
发明人： Frank Pappas , John L. Rennick
IPC分类号： H02H3/12 , H04N7/00
CPC分类号： H02H3/12 , Y10T307/951
摘要： A controller for initiating operation of a video tape recorder and for terminating operation when its power consumption drops to a predetermined level utilizes a power transfer circuit for coupling the recorder to a source of energizing potential. A normally open switch, included in the transfer circuit, responds to an actuating signal developed by an operational amplifier, which amplifier is activated by an enabling signal from a preset clock. Thereafter, the amplifier is controlled by a derived signal having an amplitude proportional to the current drawn by the recorder. When the energizing current for the recorder drops below a predetermined level, the derived control signal is now of insufficient amplitude to maintain the amplifier in an operating condition, as a result, the actuating signal for switch is interrupted and operation of the recorder is terminated.
摘要翻译：用于启动录像机操作的控制器，并且当其功耗降到预定值时终止操作，利用功率传输电路将记录器耦合到通电电位源。包括在传送电路中的常开开关响应由运算放大器开发的致动信号，该放大器由来自预设时钟的使能信号激活。此后，放大器由具有与记录器所绘制的电流成比例的幅度的导出信号控制。当记录器的通电电流下降到预定水平以下时，导出的控制信号现在振幅不足以将放大器维持在工作状态，结果，开关的启动信号被中断，并且记录器的操作终止。

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