| 摘要 |
PURPOSE:To always compensate a rectification by correcting a current flowed to an auxiliary winding in response to excess or insufficient value of a rectification compensating amount and the magnitude of the value. CONSTITUTION:The outputs of a current detector 13 and a rotating speed detector 14 are input to a multiplier 15, and the result is input to a gate signal generator 16. The switching frequency and the conduction rate of a current controller are controlled by the obtained gate signal to control a current flowed to an auxiliary winding 8. The position of a sparkless zone varies as the operating time is elapsed, and when exceeding a rectification compensating range, a spark is generated from a brush 11. The excess or insufficient value of the rectification compensating amount and the magnitude of the amount are detected by a search coil 19, and a rectification compensating amount correcting circuit 20 outputs a correcting voltage in response to the output of the coil 19. Thus, the optimum rectification compensation can be always performed. |
