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    • 10. 发明授权
    • Flyback transformer driving apparatus for video display appliances
    • 用于视频显示设备的反激式变压器驱动装置
    • US5644198A
    • 1997-07-01
    • US700591
    • 1996-08-14
    • Kwang Ho Park
    • Kwang Ho Park
    • H04N3/16H01F38/42H04N3/185H01J29/70
    • H04N3/185
    • A flyback transformer (FBT) driving apparatus for video display appliances which can prevent deterioration of the FBT efficiency caused by excessive horizontal frequency input. The FBT driving apparatus employs a PWM-type circuit to evenly maintain the Vcc power supply provided to the primary winding of the FBT irrespective of the excessive horizontal frequency input. The FBT driving apparatus makes use of the horizontal frequency per se in the low frequency band, while dividing the horizontal frequency by a half in the high frequency band to enable operation of the FBT by means of ordinary rectifying diodes even in the input of the high horizontal frequency and to prevent deterioration of the FBT efficiency caused by input of the high horizontal frequency.
    • 用于视频显示设备的回扫变压器(FBT)驱动装置,其可以防止由于过度的水平频率输入引起的FBT效率的劣化。 FBT驱动装置采用PWM型电路,均匀地维持提供给FBT的初级绕组的Vcc电源,而不考虑过多的水平频率输入。 FBT驱动装置在低频带中利用水平频率本身,而在高频带中将水平频率除以一半,使得即使在高输入端也可以通过普通整流二极管来操作FBT 水平频率,防止输入高水平频率引起的FBT效率降低。