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1. 发明授权

US4468726A Optically-triggered half-frequency AC converter 失效
标题翻译：光触发式半频交流转换器
公开(公告)号：US4468726A
公开(公告)日：1984-08-28
申请号：US376899
申请日：1982-05-10
申请人： Louis J. L. Daigle , Donald C. Paine , Anthony J. Bednarczyk
发明人： Louis J. L. Daigle , Donald C. Paine , Anthony J. Bednarczyk
IPC分类号： H02M7/525 , H02P27/02 , H02M5/257
CPC分类号： H02M7/525 , H02P27/02 , Y10S323/902
摘要： An optically-triggered converter directly changes the frequency of an incoming voltage waveform to half frequency thereby causing an induction motor, driving a ventilation fan or the like, to operate at half speed. At this lower speed, the induction motor consumes significantly less power. A center-tapped power transformer is used to lower the magnitude of the incoming voltage waveform and a number of optically-triggered thyristor switches are connected between the transformer secondary and the induction motor. The novel trigger circuit includes a synchronous motor connected to receive the input voltage waveforms so that a cylinder attached thereto is rotated in synchronism with the input voltage waveforms. The optically-triggered thyristors are circumferentially positioned about the rotating cylinder and are triggered by a light pulse emerging through an aperture in the cylinder sidewall. The arrangement of the thyristors around the cylinder is selected so that the thyristors are enabled in a predetermined sequence forming fundamental three-phase half-frequency waveforms which are then presented to the induction motor.
摘要翻译：光触发转换器将输入电压波形的频率直接改变为半频，从而使感应电动机，驱动通风扇等以半速运行。在这种较低的速度下，感应电动机的功率明显减少。中心抽头电源变压器用于降低输入电压波形的幅度，并且多个光触发晶闸管开关连接在变压器次级和感应电动机之间。新颖的触发电路包括一个同步电动机，其连接以接收输入电压波形，使得附接到其上的汽缸与输入电压波形同步地旋转。光触发晶闸管围绕旋转圆筒周向定位，并且由通过气缸侧壁中的孔出现的光脉冲触发。选择晶闸管围绕圆柱体的布置，使得晶闸管以预定的顺序启用，形成基本的三相半频波形，然后将其提供给感应电动机。

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