| 摘要 |
The present invention relates to a broadband switching drive compensating circuit for a video display device, which comprises a horizontal size detecting unit for detecting a horizontal size; a horizontal frequency detecting unit for detecting a horizontal frequency; a first DC voltage generating unit for generating a first DC voltage according to the detected horizontal size; a second DC voltage generating unit for generating a second DC voltage according to the detected horizontal frequency; a driving current compensating unit for altering a B+1 driving current according to the generated first and second DC voltages; and a horizontal deflection unit for switching a horizontal output transistor according to the altered B+1 driving current and then supplying a sawtooth current to a horizontal deflection coil. In a multi-mode video display device having a broadband frequency, the driving conditions of a switching power transistor is compensated according to the changes of the horizontal size and the horizontal frequency for establishing the driving conditions of the switching power transistor to the optimum conditions, to thereby perform the stable switching operations of the switching power transistor.
|
