Title:
PHASE-DIFFERENCE DETECTING CIRCUIT
Document Type and Number:
Japanese Patent JPH07311228
Kind Code:
A
Abstract:
PURPOSE: To provide a phase-difference detecting circuit, wherein the phases of an inverter and a commercial power supply are aligned.
CONSTITUTION: An inverter output-voltage waveform Vi is subtrated from a commercial voltage waveform Vc, with a subtracting circuit 10. The output of the circuit 10 is converted into the square wave with a comparator 5. The inverter output-voltage waveform Vi is processed with an amplifier circuit 20 and a comparator 2. This phase-difference detecting circuit is constituted of these parts. Furthermore, the outputs of the comparator 5 and the comparator 2 are inputted into delay circuits 3 and 6, respectively, and the outputs of the delay circuits 3 and 6 are compared and operated in a comparator 7.
Inventors:
MATSUNAGA KAZUYOSHI
Application Number:
JP10635494A
Publication Date:
November 28, 1995
Filing Date:
May 20, 1994
Export Citation:
Assignee:
FUJI ELECTRIC CO LTD
International Classes:
G01R25/00; G05F5/02; H02J3/38; H02M7/493; H02P5/74; (IPC1-7): G01R25/00; G05F5/02; H02J3/38; H02M7/48; H02P7/74
Attorney, Agent or Firm:
Iwao Yamaguchi
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