Patent ID: 6285164
Filing Date: 2001-09-04
Classification: G01R

Abstract:
An apparatus for detecting an integrated value of current flow, comprising:an integrator including an integration capacitor, to which a current sensor voltage is inputted, for outputting an output voltage corresponding to an integrated value of said current sensor voltage;a resetting circuit for clearing integration electric charges accumulated in said integration capacitor to reset said integrator when said output voltage has reached an upper threshold value or a lower threshold value;a counter for counting the number of resets of said integrator in an upper direction or in a lower direction; anda connection-polarity inverting circuit for inverting a polarity of inputting of said current sensor voltage to said integrator, a polarity of connecting of said integration capacitor to said integrator and a counting direction of said counter, alternatively, at a regular time interval and synchronously;wherein an integrated value of current flow is obtained on the basis of a count value of said counter.