Title:
PHASE DETECTING FILTER CIRCUIT
Document Type and Number:
Japanese Patent JP3404538
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To make a phase detecting filter circuit, smaller, lighter and at a lower cost as well as more reliable and more easily adjustable.
SOLUTION: This filter circuit comprises resistors, capacitors and reactors, an AC power voltage being added to a circuit to which the first reactor, the first capacitor and the second capacitor are directly connected and a circuit to which the second reactor and the resistor are connected in series being connected in parallel to the second capacitor to provide the same input and output property as that of the circuit with voltage at both ends of the resistor as an output signal. In this case, it is constituted of only electronic circuits op22, 23, 25, 26 with integrating function and electronic circuits op21, 24, 26 with adding function so that the integration constant of the electron circuit op23 having integrating function to operate equal to the reactor and the capacitor can be determined by a semi-fixed resistor vr22.
Inventors:
Satoshi Inarita
Satoshi Horie
Koji Kishimoto
Nanun Minoru
Satoshi Horie
Koji Kishimoto
Nanun Minoru
Application Number:
JP12323297A
Publication Date:
May 12, 2003
Filing Date:
April 25, 1997
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
G01R25/00; H02M7/06; H03H11/04; (IPC1-7): G01R25/00; H03H11/04
Domestic Patent References:
| JP1236725A | ||||
| JP55125081A | ||||
| JP4737147A |
Attorney, Agent or Firm:
Shigeru Sasaoka (1 person outside)
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