摘要:
PROBLEM TO BE SOLVED: To provide a power generator for a vehicle, which can promptly shut off the generation of a high voltage when a load dump occurs and prevent false operation due to false detection of a power generation stop state.SOLUTION: The power generator 1 for a vehicle comprises: a field winding 102; an armature winding 101; a bridge circuit 103; a rotation detection circuit 205 for detecting the presence or absence of a rotation on the basis of a phase voltage; an excitation current control circuit 213 for keeping an output voltage to a regulated voltage when detecting the rotation; overvoltage detection circuits 214 and 105 for detecting an overvoltage when an output voltage exceeds a threshold voltage V2; a bridge-control circuit 104 for performing on-off control of a MOS transistor when detecting no overvoltage and continuing to turn on the MOS transistor when detecting the overvoltage; and a rotation-output keeping circuit 206 for, when detecting no overvoltage, outputting an output signal from the rotation detection circuit 205 toward the excitation current control circuit 213, and when detecting the overvoltage, outputting a signal for keeping the content of the rotation detection by the rotation circuit 205 at that time toward the excitation current control circuit 213.
摘要:
PROBLEM TO BE SOLVED: To realize effective protection to avoid damage due to overvoltage during load dump.SOLUTION: To identify existence of load dump, it is checked whether phase voltage of a generator device in each half-wave period exceeds a prescribed threshold. When the existence of load dump is identified, the phase voltage is reduced to a prescribed voltage smaller than the threshold using a voltage limit.