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    • 10. 发明申请
    • METHOD AND APPARATUS FOR DRIVING DEFLECTION AND HIGH VOLTAGE STAGES IN A VIDEO DISPLAY
    • 用于在视频显示器中驱动偏移和高电压阶段的方法和装置
    • WO1997004526A1
    • 1997-02-06
    • PCT/US1996012107
    • 1996-07-22
    • APPLE COMPUTER, INC.
    • APPLE COMPUTER, INC.KRAUSE, Peter
    • H03K17/60
    • H03K4/64H03K4/62H03K17/601H04N3/223H04N3/27
    • The present invention, generally speaking, provides an improved base drive arrangement for scan and/for EHT output stages in a television or video display monitor. In accordance with one aspect of the invention, by adding just a few components to an existing main base drive circuit, two power transistors may be driven, e.g., a scan output transistor and an EHT output transistor. The two power transistors are switched at the same time, allowing pulse width modulators of the scan and EHT circuits to operate on a common time base. Switching of two power transistors at the same time would usually require a quite complicated design to offset the different storage times of the two devices, thereby achieving high performance but at a considerable cost premium. The base drive circuit of the invention achieve substantial synchronization of the two transistors at minimal cost. In accordance with another aspect of the invention, a base drive circuit uses a low DC supply voltage and a resistive element in series with the main current path in order to produce a more constant maximum base current over frequency.
    • 一般而言,本发明为电视或视频显示监视器中的扫描和/或EHT输出级提供了改进的基本驱动装置。 根据本发明的一个方面,通过仅将一些组件添加到现有的主基极驱动电路中,可以驱动两个功率晶体管,例如扫描输出晶体管和EHT输出晶体管。 同时切换两个功率晶体管,允许扫描和EHT电路的脉宽调制器在公共时基上工作。 同时切换两个功率晶体管通常需要相当复杂的设计来抵消两个器件的不同存储时间,从而实现高性能,但成本高昂。 本发明的基极驱动电路以最小的成本实现了两个晶体管的实质同步。 根据本发明的另一方面,基极驱动电路使用与主电流路径串联的低DC电源电压和电阻元件,以便在频率上产生更恒定的最大基极电流。