| 摘要 |
A power supply system of a display apparatus and a control method thereof comprising a DC (Direct current) converter to convert an AC (Alternating Current) voltage into a DC voltage; a PWM (Pulse Width Modulator) to generate a PWM signal; a transformer to receive the DC voltage of the DC converter and to output an AC voltage according to the PWM signal from the PWM; an output circuit to lower the AC voltage from the transformer and to supply the lowered voltage to various components; a sync signal supplier to generate a sync signal having a frequency equal to a frequency of a horizontal sync signal, which is externally input, to generate the PWM signal synchronized to the horizontal sync signal and to supply the sync signal to the PWM; and a controller to determine a power saving mode depending on whether the horizontal sync signal or a vertical sync signal is externally input, and to control the sync signal supplier to generate the sync signal having a frequency equal to the frequency of the horizontal sync signal by outputting a corresponding signal of the power saving mode and a clamp signal generated from the input horizontal sync signal to the sync signal supplier to supply power according to the determined power saving mode. With this configuration, the power supply system of a display apparatus the control method thereof provides a simply implemented circuit, thereby reducing cost and consuming less power.
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