| 摘要 |
PURPOSE: A horizontal deflection circuit of a display apparatus is to prevent the horizontal deflection circuit from being damaged when a user changes a frequency mode and to quickly reduce an output duty width of a pulse width modulation circuit when high frequency is changed into low frequency. CONSTITUTION: A horizontal deflection circuit comprises a horizontal output circuit(240) supplying a sawtooth current to a deflection coil, a voltage control circuit(230) for controlling a voltage applied to the horizontal output circuit, a synchronous processor(210) outputting a control signal by receiving a frequency of a synchronous signal, a pulse width modulation circuit(220) for controlling current quantity flowing in the voltage control circuit depending on the control signal of the synchronous processor, a feedback circuit(250) for feeding back the voltage, which is applied from the voltage control circuit to the horizontal output circuit, to the pulse width modulation circuit, and a stabilizing circuit(100), provided between the synchronous processor and the pulse width modulation circuit, for controlling a direct current to be applied to the pulse width modulation circuit, depending on the change of frequency applied to the synchronous processor. |
