Patent ID: 7180271

Claim:
A vehicle generator regulating apparatus comprising: a switching device operating to allow a field current to flow into a field coil of said vehicle generator from a battery being charged by said vehicle generator when said switching device is applied with a voltage signal; a drive circuit applying said voltage signal to said switching device when said drive circuit is supplied with a control signal; and a control circuit detecting an output voltage of said battery and supplying said control signal to said drive circuit when said output voltage is detected to be not above a predetermined voltage; said drive circuit including a charge pump circuit stepping up a DC voltage supplied from said battery to generate said voltage signal by repeatedly performing a cycle of charging and discharging a plurality of capacitors in synchronization with an oscillation signal, and an oscillator circuit supplying said oscillation signal to said charge pump circuit, said drive circuit being configured to lower a frequency of said oscillation signal when said vehicle generator is in a low power output state.