| 摘要 |
PURPOSE: A multiplied voltage generating circuit is provided to reduce weight and size of the circuit and reduce switching noise by generating multiplied power voltages having multiple double levels without using an additional boosting switching transformer. CONSTITUTION: A multiplied voltage generating circuit comprises a micro computer(22) having two output terminals(OUT20,OUT21), and which outputs first and second switching pulse signals having inverted phases through output terminals; a first switching unit(24) for switching the power voltage output from a power circuit unit(20) in accordance with the first switching pulse signal output from the micro computer, and generating a pulse signal; a second switching unit(26) for switching the power voltage output from the power circuit unit in accordance with the second switching pulse signal output from the micro computer, and generating a pulse signal; and a voltage doubler rectifier(28) for inputting pulse signals output from first and second switching units in such a manner that pulse signals have inverted phases, respectively, rectifying input signals, and outputting power voltages having multiple double levels. First and second switching units have transistors(Q21,Q22,Q23,Q24) which are turned on/off in accordance with switching pulse signals output from the micro computer and switch positive power and negative power of the power circuit unit, respectively.
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