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    • 67. 发明申请
    • Full digital dimming ballast for a fluorescent lamp
    • 荧光灯全数字调光镇流器
    • US20050156534A1
    • 2005-07-21
    • US10758520
    • 2004-01-15
    • In-Hwan Oh
    • In-Hwan Oh
    • H05B41/282H05B41/392H05B41/36
    • H05B41/2828H05B41/392Y02B20/186Y10S315/04
    • A lamp control circuit is described, containing a power factor corrector, coupled to it a digitally controlled ballast, having power devices. The digitally controlled ballast is capable of powering a lamp. The ballast is controlled by a current feedback loop, coupled between the power devices and the digitally controlled ballast, and a voltage feedback loop, coupled between the lamp and the digitally controlled ballast. Further, a method of operating a lamp-control circuit is presented, the circuit containing a digital controller, an output stage, a current feedback loop, and a voltage feedback loop. In operation the digital controller receives a current feedback signal or a voltage feedback signal from the output stage and the lamp. In response to the received signal the digital controller generates a digital control signal and powers a lamp through the output stage according to the generated digital control signal.
    • 描述了一种灯控制电路,其包含功率因数校正器,其耦合到具有功率器件的数字控制的镇流器。 数字控制的镇流器能够为灯供电。 镇流器由耦合在功率器件和数字控制的镇流器之间的电流反馈回路控制,以及耦合在灯和数字控制的镇流器之间的电压反馈回路。 此外,提出了一种操作灯控制电路的方法,该电路包含数字控制器,输出级,电流反馈回路和电压反馈回路。 在操作中,数字控制器从输出级和灯接收电流反馈信号或电压反馈信号。 响应于接收到的信号,数字控制器产生数字控制信号,并根据产生的数字控制信号通过输出级为灯供电。
    • 68. 发明授权
    • Horizontal deflection apparatus
    • 水平偏转装置
    • US06191958B1
    • 2001-02-20
    • US09420437
    • 1999-10-18
    • In-Hwan Oh
    • In-Hwan Oh
    • H02M3335
    • H04N3/16H02M3/335
    • Disclosed is an apparatus for controlling a drive transistor of a horizontal deflection apparatus which comprises a comparator; a switching controller which compares a reference voltage coupled to a non-inverting terminal with a signal provided externally through an inverting terminal and removes noise; a switch including a first switch coupled to a constant voltage and a grounded second switch, either the first or second switch being operated according to an output of the switching controller; a diode; a capacitor; a resistor; and a base current supplier. When the constant current, generated by the constant voltage, is provided through the first switch, the constant current is provided to the base terminal of the transistor through the diode, the transistor is turned on, and the capacitor is charged to as much as a forward voltage drop of the diode, and when the first switch is turned off and the grounded second switch is turned on, the transistor is turned off to discharge the capacitor. The present invention supplies a uniform current to the base terminal or discontinues the supply of the uniform current so as to reduce switching loss of the transistor.
    • 公开了一种用于控制水平偏转装置的驱动晶体管的装置,其包括比较器; 开关控制器,其将耦合到非反相端子的参考电压与通过反相端子外部提供的信号进行比较,并去除噪声; 开关,包括耦合到恒定电压的第一开关和接地的第二开关,所述第一或第二开关根据所述开关控制器的输出而被操作; 二极管 电容器 一个电阻; 和一个基本的当前供应商。 当通过第一开关提供由恒定电压产生的恒定电流时,通过二极管将恒定电流提供给晶体管的基极,晶体管导通,并将电容器充电至 二极管的正向压降,当第一开关断开并接地第二开关导通时,晶体管截止以使电容器放电。 本发明向基极端子提供均匀的电流,或者不连续地提供均匀电流,以减小晶体管的开关损耗。