Patent ID: 7327545

Claim:
An electric generation control device of an electric generator having a stator winding and a field winding, the electric generation control device comprising: excitation switching means, composed of a pair of arms in four arms forming a H bridge circuit, configured to perform ON and OFF switching between the field winding of the electric generator driven by revolution of an engine and charging means supplying a current to the field winding; regeneration switching means, composed of another pair of arms in the four arms forming the H bridge circuit, configured to charge the current flowing in the field winding to the charging means during OFF state of the excitation switching means; and control means configured to the operation of the excitation switching means and the regeneration switching means so that when one arm of the pair of the arms in the excitation switching means falls in a short failure, another arm in the excitation switching means performs the operation of the one arm fallen in the short failure, and so that when one arm of the pair of the arms in the regeneration switching means falls in a short failure, the ON and OFF switching operation of the arms in the excitation switching means is halted, and another arm in the regeneration switching means performs the ON and OFF switching instead of the excitation switching means.