Title:
CROSS CURRENT DETECTION CIRCUIT
Document Type and Number:
Japanese Patent JP2929466
Kind Code:
B2
Abstract:
PURPOSE: To detect a cross current of an inverter by a method wherein an output voltage and an output current from the inverter are differentiated and respective differential waveforms are converted into the square-wave pulses of the output voltage and the output current and the logical conjunction of both the converted square-wave pulses is outputted.
CONSTITUTION: An output voltage and an output current from an inverter 2 are differentiated by first and second differential circuits (CR filters) 3 and 4 and respective differential waveforms are converted into the square-wave pulses of the output voltage and the output current by first and second comparing circuits 5 and 6. In accordance with the logic of a logical conjunction signal outputted from a logical conjunction circuit 7, the existence of a cross current is judged by the logical conjunction of both the converted square-wave pulses. With this constitution, the cross current can be detected securely without employing PLL.
Inventors:
KUBOTA ZENICHI
Application Number:
JP18384693A
Publication Date:
August 03, 1999
Filing Date:
July 26, 1993
Export Citation:
Assignee:
KYOSAN SEISAKUSHO KK
International Classes:
G05F1/10; G01R29/00; G05F1/67; H02J3/38; H02J9/06; H02M7/493; H02M7/77; H03K19/173; (IPC1-7): H02J9/06; G01R29/00; H02J3/38
Attorney, Agent or Firm:
Hiroshi Arafune (1 person outside)