Abstract: This invention provides a control device for automobile battery-charging generators, adapted to supply a plurality of sets of specifications in a highly reliable and stable form by simple switching between electrical characteristics assigning and limiting functions so as to meet various needs of users. In accordance with a voltage of a battery B, a voltage control IC regulator 120 controls a field current flowing through a field winding FL. The voltage control IC regulator 120 has a plurality of functions for assigning electrical characteristics limits or electrical characteristics beforehand. The voltage control IC regulator 120 also has switch terminals SW1 and SW2 that switch the plurality of functions that assign the electrical characteristics limits or the electrical characteristics. Electric potential levels of the switch terminals SW1 and SW2 can be changed by cutting cutoff portions CP1 and CP2 of an intermediate terminal 150 or leaving these cutoff portions connected.

Abstract: In a rectifier unit having a MOSFET, there is provided a stable MOSFET rectifying operation which is not influenced by a power generation condition from a start of an engine. An output VS obtained by adding phase voltages VU, VV, and VW and a power generation voltage VBR are compared by COM1. During a period of VBR>VS, a timing signal VT having a cycle of an electrical angle of 120 degrees is obtained. In synchronism with rising of logical products AND1 and AND2 based on a comparison result VH-ON of a phase voltage VU and a power generation voltage VB and a comparison result VL-ON of a phase voltage VU and a GND potential, flip-flops FF1 and FF2 are operated. Then, a gate signal VHGD of an upper-stream side MOSFET and a gate signal VLGD of a lower-stream side MOSFET are outputted to execute a MOSFET rectifying operation.

Abstract: A rectifier of vehicular alternator that rectifies AC electrical power into DC electrical power comprises: a rectifier that includes a plurality of MOS FETs that are used as rectifier elements; a control circuit that applies drive signals to the gates of the plurality of MOS FETs via gate drive signal lines, and that thereby commands continuity and discontinuity of the plurality of MOS FETs; and a plurality of load circuits, one connected between the gate and the source of each of the MOS FETs, for bleeding down electric charge accumulated by gate capacitance of the MOS FET if the gate drive signal line is interrupted.

Abstract: This invention provides a control device for automobile battery-charging generators, adapted to supply a plurality of sets of specifications in a highly reliable and stable form by simple switching between electrical characteristics assigning and limiting functions so as to meet various needs of users. In accordance with a voltage of a battery B, a voltage control IC regulator 120 controls a field current flowing through a field winding FL. The voltage control IC regulator 120 has a plurality of functions for assigning electrical characteristics limits or electrical characteristics beforehand. The voltage control IC regulator 120 also has switch terminals SW1 and SW2 that switch the plurality of functions that assign the electrical characteristics limits or the electrical characteristics. Electric potential levels of the switch terminals SW1 and SW2 can be changed by cutting cutoff portions CP1 and CP2 of an intermediate terminal 150 or leaving these cutoff portions connected.

Abstract: In a rectifier unit having a MOSFET, there is provided a stable MOSFET rectifying operation which is not influenced by a power generation condition from a start of an engine. An output VS obtained by adding phase voltages VU, VV, and VW and a power generation voltage VBR are compared by COM1. During a period of VBR>VS, a timing signal VT having a cycle of an electrical angle of 120 degrees is obtained. In synchronism with rising of logical products AND1 and AND2 based on a comparison result VH-ON of a phase voltage VU and a power generation voltage VB and a comparison result VL-ON of a phase voltage VU and a GND potential, flip-flops FF1 and FF2 are operated. Then, a gate signal VHGD of an upper-stream side MOSFET and a gate signal VLGD of a lower-stream side MOSFET are outputted to execute a MOSFET rectifying operation.