发明名称 |
EFFECTIVE VALUE DETECTING CIRCUIT |
摘要 |
PURPOSE:To obtain an output corresponding to an effective value, by producing a square output signal obtained by squaring each instantaneous value of an input alternating signal to perform DC reproduction by making the square output signal pass through a clamping circuit and then carrying out the filtering of a low band and a pass band. CONSTITUTION:An input alternating signal 1 (Asintheta) is squared by the square characteristics of FET8 and 9 of a squaring circuit part 2 and then added through an analog adding circuit 15. Thus a DC component (A<2>/2).cos2theta is obtained through a coupled capacitor 16. This signal is made to pass through a clamping circuit 3 to obtain a signal 7 of K.(A<2>/2).(cos2theta+1). Then a DC signal 5 is obtained through a low-pass filter 4. The signal 5 is equal to K.A<2>/2 to correspond to an effective value (A<2>/2)<1/2>. |
申请公布号 |
JPS5853205(A) |
申请公布日期 |
1983.03.29 |
申请号 |
JP19810152519 |
申请日期 |
1981.09.25 |
申请人 |
FUJITSU KK |
发明人 |
YAMAMOTO YOUJI;MIDORIKAWA MASAHIRO |
分类号 |
G01R19/02;H03D1/18;(IPC1-7):03D1/18 |
主分类号 |
G01R19/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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