| 摘要 |
PURPOSE: An automatic power supplier is provided to reduce power consumption by detecting power character of a load and automatically authorizing optimal voltage. CONSTITUTION: An automatic power supplier includes a variable voltage unit(106) that receives direct current voltage which has variable value according to a control signal. A load resistance detecting unit(120) detects load resistance. A load current detecting unit(118) detects load current. A polarity inverting unit(112) inverts the polarity of the output voltage of the variable voltage unit(106) according to a control signal. A micro controller(116) controls the variable voltage unit(106) to authorize low voltage to the load, to detect any variation of load current, and to increase authorized voltage up to the point of load current saturation while discriminating the polarity and increasing voltage step by step when the load resistance detecting unit(120) detects load resistance. Then the micro controller(116) controls the variable voltage unit(106) the optimal voltage by increasing or decreasing authorized voltage according to the variation of load current.
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