公开(公告)号：US3885201A

公开(公告)日：1975-05-20

申请号：US47386074

申请日：1974-05-28

Applicant: RCA CORP

Inventor： FERNSLER RONALD EUGENE

IPC: H04N3/20 ,  H04N5/44

CPC classification number: H04N3/20

Abstract: A fail-safe high voltage protection circuit for a television receiver includes means for rectifying pulses developed in the high voltage transformer for developing a direct current voltage proportional thereto for providing an additional bias voltage for the automatic frequency control (AFC) transistor. If the developed high voltage pulse becomes excessive, the corresponding increased bias supplied to the AFC transistor causes an increase in the horizontal oscillator frequency resulting in an unviewable raster.

Abstract translation: 用于电视接收机的故障安全高压保护电路包括用于整流在高压变压器中产生的脉冲的装置，用于形成与其成比例的直流电压，以为自动频率控制（AFC）晶体管提供额外的偏置电压。 如果开发的高电压脉冲变得过大，则提供给AFC晶体管的相应增加的偏置导致水平振荡器频率的增加，导致不可观察的光栅。