Patent ID: 7482816
Filing Date: 2009-01-27
Classification: G01R,H02J

Abstract:
1. A voltage monitor configured to detect a voltage applied to both ends of a first capacitor and both ends of a second capacitor, the first and second capacitors being connected in series, a storage section containing at least the first and second capacitors, the voltage monitor comprising: a charging circuit configured to apply a charging voltage to the storage section; a monitoring section including; a controller configured to output a selection signal to select one of the first, second and third input terminals to the selector switch, configured to calculate application voltages to the both ends of the first capacitor and the both ends of the second capacitor according to an output from the selector switch, and configured to calculate ambient temperature of the storage section according to the temperature output, wherein the resistance values of the plurality of resistors composing the first and second voltage-dividing sections are set so that the output from the selector switch shows an abnormal voltage when a short-circuit has occurred between the first and second input terminals, and the controller detects the short-circuit between the first and second input terminals from the application voltages to the both ends of the first capacitor and the both ends of the second capacitor, the application voltages being calculated from the abnormal voltage, and the controller detects a short-circuit between the first and third input terminals from a calculated voltages applied to the both ends of the first capacitor and the both ends of the second capacitor according to an abnormal voltage at the first input terminal caused by occurrence of the short-circuit between the first and third input terminals.