Patent ID: 7719239
Filing Date: 2010-05-18
Classification: H02H

Abstract:
1. A generator control circuit comprising: a field discharge transistor having a source connected to a first terminal of a generator field winding which carries a generator field current; a free-wheeling diode having a cathode connected to a drain of said field discharge transistor and an anode connected to a second terminal of said generator field winding; a resistor connected between said first generator field winding terminal and said field discharge transistor drain, wherein when said field discharge transistor is in an on state, said generator field current bypasses said resistor; and when said field discharge transistor is in an off state, said generator field current passes through and is dissipated by said resistor; a pulse width modulator (PWM) transistor having a drain connected to said second generator field winding terminal; and a PWM controller connected to a gate of said PWM transistor.