Abstract: A battery charging apparatus that controls charging of a battery by an alternating-current generator, the battery charging apparatus has a first switch element connected to a first battery terminal to which a positive electrode side of the battery is connected in a normal connection of the battery at a first end thereof and to a first generator terminal to which a first output of the alternating-current generator is connected at a second end thereof, and a second switch element connected to the first battery terminal at a first end thereof and to a second generator terminal to which a second output of the alternating-current generator is connected at a second end thereof.

Abstract: The battery charging apparatus 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, and 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. In a case where 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.

Abstract: In a battery charger, the rectifier includes rectifying elements provided for respective three phases. The rectifier supplies, for the respective phases, currents for rectifying three-phase AC voltages so as to charge a battery. A voltage detector detects whether or not the battery is charged. Switching units are provided for the respective rectifying elements, and rectify the AC voltages to charge the battery in the off-state. Switch controllers output gate signals in accordance with a timing of zero-cross detection upon receiving a detection signal indicating that all the gate signals for turning on and off the respective switching units for the respective phases are supplied in the order of the phases.

Abstract: An example battery charging circuit includes a rectifier circuit for rectifying a three-phase AC voltage outputted from an electric power generator and generating a charge voltage for charging a battery. A voltage detection circuit detects that the voltage of the battery exceeds a predetermined voltage. A switching circuit, in an off-state, charges the battery through the rectifying circuit and, in an on-state, short-circuits the electric power generator through the rectifier circuit. A switch control circuit brings the switching circuit into the on-state, when it is detected by the voltage detection circuit that the voltage of the battery exceeds the predetermined voltage. A control circuit allows the switch control circuit to subsequently perform a control for bringing the switching circuit into the off-state.

Abstract: There is provided a battery charging technique by which various battery charging control can be achieved even when power consumption of a battery is small. In a battery charger, in order not to turn OFF a power switch even when an ACG starting detection circuit recognizes that an output of a generator is not generated in a state in which the power consumption of the battery is small and the voltage of the battery is not dropping, a voltage of the battery in addition to phase terminal signals of a three-phase alternating-current generator is inputted to the ACG starting detection circuit, and the ACG starting detection circuit controls not to turn OFF the power switch when the output of the three-phase alternating-current generator is generated or when the voltage of the battery is equal to or higher than a predetermined voltage.

Abstract: Provided is a battery charging technique by which high efficiency of the battery charging can be always controlled no matter how the power consumption of the battery is changed. In a battery charger, a charging control circuit holds a charge/non-charge state of a battery during an arbitrary period of time in order to prevent the unbalance of phase voltages due to occurrence of transition between the charge/non-charge states during a short period of time and the reduction of the efficiency of the battery charging. Further, zero-crossing erroneous detection in a phase voltage of the output of a three-phase alternating-current generator due to noises is prevented.

Abstract: In a battery charger, the rectifier includes rectifying elements provided for respective three phases. The rectifier supplies, for the respective phases, currents for rectifying three-phase AC voltages so as to charge a battery. A voltage detector detects whether or not the battery is charged. Switching units are provided for the respective rectifying elements, and rectify the AC voltages to charge the battery in the off-state. Switch controllers output gate signals in accordance with a timing of zero-cross detection upon receiving a detection signal indicating that all the gate signals for turning on and off the respective switching units for the respective phases are supplied in the order of the phases.

Abstract: A battery charging circuit comprises: a rectifier circuit (2) for rectifying a three-phase AC voltage outputted from an electric power generator (1) and generating a charge voltage for charging a battery (B); a voltage detection circuit (4) for detecting that the voltage of the battery (B) exceeds a predetermined voltage; a switching circuit (3) for, in an off-state, charging the battery (B) through the rectifier circuit (2) and, in an on-state, short-circuiting the electric power generator (1) through the rectifier circuit (2); a switch control circuit (5) for, when it is detected by the voltage detection circuit (4) that the voltage of the battery (B) exceeds the predetermined voltage, bringing the switching circuit (3) into the on-state; and a control circuit (6) for allowing the switch control circuit (5) to subsequently perform a control for bringing the switching circuit (3) into the off-state.