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    • 4. 发明公开
    • 전원공급회로
    • 电源电路
    • KR1020090123021A
    • 2009-12-01
    • KR1020097022597
    • 2008-03-18
    • 다이킨 고교 가부시키가이샤
    • 나카모토료우하시모토마사후미시마타니게이스케요시사카게이이치가토우마사카즈
    • H02M7/12H02M7/48
    • H02M7/2176H02M1/12H02M5/44
    • A power supply circuit is provided with a switching element (S) for short-circuiting output power of a diode bridge circuit (12); a zero-cross detecting section (5a) for detecting a point where an input voltage is at a reference value or lower; a timer section (5d) which starts counting from a time when such point is detected; and a PAM waveform output section (5c) for switching the switching element (S) in prescribed timing by using such count so that the waveform of the input current becomes sine wave. The power supply circuit is also provided with a correcting section (5e) which corrects the initial value of the count of the timer section (5d) when there is a difference between the detection interval of the zero-cross detecting section (5a) and an average value so far, by the quantity of such difference.
    • 电源电路设置有用于短路二极管电桥电路(12)的输出功率的开关元件(S); 检测输入电压为基准值以下的点的零交叉检测部(5a); 定时器部分(5d),其从检测到这样的点开始计时; 以及PAM波形输出部(5c),用于通过使用这样的计数使规定的定时切换开关元件(S),使得输入电流的波形成为正弦波。 电源电路还设置有校正部分(5e),当校正部分(5d)的检测间隔与零交叉检测部分(5a)的检测间隔之间存在差异时,校正部分(5e)校正定时器部分(5d)的计数的初始值 到目前为止的平均值,这个差异的数量。