SYNCHRONIZING CIRCUIT FOR POWER SWITCHING FREQUENCY OF MONITOR

摘要

PURPOSE: A circuit for synchronizing a power supply frequency of a monitor is provided to simplify the configuration of a circuit by removing a power supply noise generated from a switching mode power supply of a monitor, and by simultaneously providing a horizontal frequency of a low-voltage level to the power supply. CONSTITUTION: A synchronizing circuit unit(80) is composed of an opto coupler instead of a switching transformer. The synchronizing circuit unit(80) receives a horizontal frequency for synchronizing a switching frequency not from an automatic frequency control circuit unit(20) but from a horizontal oscillation unit(30). The synchronizing circuit unit(80) is operated by an output signal of the horizontal oscillation unit(30) of a monitor. In addition, the circuit unit(80) outputs a waveform of a frequency synchronized with the horizontal frequency to a switching mode power supply(10).