Patent ID: 6304474
Filing Date: 2001-10-16
Classification: H02M

Abstract:
A chopper circuit for generating a chopper voltage from electrical power of a power source, this chopper voltage being generated between a first line and a second line, the chopper circuit comprising:a comparator for detecting an electromotive force, which compares a voltage of the first line with a voltage of an input terminal to which electrical power of the power source is supplied;a switching section for charging provided between the first line and the input terminal, which, in a case in which a comparison result from the comparator is that the voltage of the input terminal is equal to or greater than a prescribed voltage, causes current to flow in one direction;a switching section for a closed loop, provided between the second line and the input terminal, comprising a switching element and a unidirectional element connected in parallel with the switching element, which causes current to flow in one direction; anda controller controlling the switching element of the switching section,wherein the controller comprises:a closed-loop controller setting a shorted period based on a clock signal, which, in a case in which the switching section for charging is off during the shorted period, sets the switching section for a closed loop to on until the end of the shorted period, anda closed-loop inhibiting controller, which, in a case in which chattering occurs in the switching section for charging, forcibly sets the switching section for the closed loop to the off state for a given amount of time.