Insulation detecting device for non-grounded power source

An insulation detecting device having a capacitor and a DC power source, insulated from a ground potential part. A voltage detecting unit, detects a voltage across the capacitor. A first switching unit connects the capacitor to the DC power source in series for a first preset time shorter than a tim...

Full description

Saved in:
Bibliographic Details
Main Authors Oshiro, Kazutoshi, Kawamura, Yoshihiro, Sone, Toshihiro, Shimada, Tadashi
Format Patent
LanguageEnglish
Published 11.07.2006
Online AccessGet full text

Cover

More Information
Summary:An insulation detecting device having a capacitor and a DC power source, insulated from a ground potential part. A voltage detecting unit, detects a voltage across the capacitor. A first switching unit connects the capacitor to the DC power source in series for a first preset time shorter than a time taken for completely charging the capacitor. A second switching unit connects the capacitor between a positive terminal of the DC power source and the ground potential part in series for a second preset time. A third switching unit connects the capacitor between a negative terminal of the DC power source and the ground potential part in series for the second preset time. A fourth switching unit connects the voltage detecting unit to the capacitor after the first to third switching units are turned off. A computing unit estimates a voltage across the power source.