| 摘要 |
PURPOSE: An electric source supplying device of a variable switching mode is provided to minimize the influence of EMI by using a circuit device which changes the output timing and the frequency of the electric source switching pulse signal. CONSTITUTION: An electric source supplying device of a variable switching mode comprises an EMI filter(11), a rectifier(12), a transformer(13), a rectifier(14), a switching device(18), a pulse generating device(17), an initial driving circuit(15), a frequency setting circuit(16), a frequency changing circuit(19). The frequency changing circuit(19) changes periodically changes the setting value of the frequency setting circuit(16).
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