公开(公告)号：US3912977A

公开(公告)日：1975-10-14

申请号：US47178374

申请日：1974-05-20

Applicant: RCA CORP

Inventor： FILLMORE RICHARD PLUMB

IPC: H02H7/00 ,  G04G9/00 ,  G09G3/18 ,  H02H3/24 ,  H02H3/50 ,  H02H7/10

CPC classification number: H02H3/243 ,  G04G9/0047 ,  G09G3/18 ,  H02H3/50

Abstract: When the oscillator which supplies the alternating drive voltage for a liquid crystal display fails, the circuit of the present application removes the direct current operating voltage from the liquid crystal driver transistors. The oscillator drives a voltage converter which produces the operating voltage. A transistor in series with the line carrying the operating voltage is controlled by the operating voltage developed by the converter so that when the oscillator fails and the converter goes off, the transistor cuts off.

公开(公告)号：US3702943A

公开(公告)日：1972-11-14

申请号：US3702943D

申请日：1971-11-05

Applicant: RCA CORP

Inventor： HEUNER ROBERT CHARLES ,  FILLMORE RICHARD PLUMB

IPC: H03K5/02 ,  H03K17/14 ,  H03K19/0948 ,  H03K5/20

CPC classification number: H03K5/023 ,  H03K17/145 ,  H03K19/0948

Abstract: Two field-effect transistors interconnected in such a way that the output voltage produced by the first, which is a function of its voltage threshold, controls the conductivity of the second. One transistor may be reverse biased source-to-substrate to maintain its threshold voltage higher than that of the other. A small change in voltage level may be detected by this circuit by causing that change concurrently to reduce the source-tosubstrate reverse bias of the first transistor and to reverse bias the source-to-substrate of the second transistor.

Abstract translation: 两个场效应晶体管以这样的方式相互连接，使得由其电压阈值的函数的第一个产生的输出电压控制第二个的电导率。 一个晶体管可以是反向偏置的源到衬底，以使其阈值电压比另一个更高。 该电路可以通过同时引起该变化来降低第一晶体管的源到衬底反向偏置并反向偏置第二晶体管的源极到衬底，可以检测电压电平的小的变化。

公开(公告)号：US3913006A

公开(公告)日：1975-10-14

申请号：US47155374

申请日：1974-05-20

Applicant: RCA CORP

Inventor： FILLMORE RICHARD PLUMB

IPC: G04G19/02 ,  H02M3/156 ,  H02P13/18 ,  G04C3/00

CPC classification number: G04G19/02 ,  H02M3/156

Abstract: A circuit for regulating the voltage across a capacitor which is charged by a pulse driven voltage converter. In the present circuit the voltage across the capacitor is sampled during each pulse period. The width of the pulse employed to drive the converter is then adjusted in response to this voltage to the lowest value required to replace the charge lost by the capacitor since the preceding pulse.