Patent ID: 9337673
Filing Date: 2016-05-10
CPC Classification: H02J,H02M

Claim Text:
1. A battery charging apparatus that controls charging of a battery by an alternating-current generator, comprising: a first generator terminal to which a first output of the alternating-current generator is connected; a second generator terminal to which a second output of the alternating-current generator is connected; a first battery terminal to which a positive electrode side of the battery is connected in a normal connection condition of the battery; a second battery terminal to which a negative electrode side of the battery is connected in the normal connection condition of the battery, the battery and a fuse being connected in series with each other between the first battery terminal and the second battery terminal; a rectifying circuit that has a first switch element connected to the first battery terminal at a first end thereof and to the first generator terminal at a second end thereof, a second switch element connected to the first battery terminal at a first end thereof and to the second generator terminal at a second end thereof, a first rectifying element connected to the first generator terminal at a first end thereof and to the second battery terminal at a second end thereof, and a second rectifying element connected to the second generator terminal at a first end thereof and to the second battery terminal at a second end thereof, rectifies an output current of the alternating-current generator and outputs the rectified output current to the first battery terminal; a detecting circuit that detects a reverse connection condition of the battery in which the negative electrode side of the battery is connected to the first battery terminal and the positive electrode side of the battery is connected to the second battery terminal, and controls either of the first switch element and the second switch element based on a detection result; and a controlling circuit that controls the first switch element and the second switch element of the rectifying circuit to rectify the output current of the alternating-current generator, wherein in a case when the controlling circuit stops controlling the first switch element and the second switch element, and the first switch element and the second switch element are turned off, the detecting circuit forcedly turns on at least one of the first switch element and the second switch element when the detecting circuit detects the reverse connection condition of the battery.