| 摘要 |
A regulated chopped DC power supply comprising an alternator with a stator and a rotor, the alternator having a three-phase winding for providing a high voltage output (0 &cir& /1, 0 &cir& /2, 0 &cir& /3) and a star-connected three-phase winding for providing a low voltage output. Control means (14) for commutating rectifier means (12) connected to the high voltage output (0 &cir& /1, 0 &cir& /2, 0 &cir& /3) of the alternator to produce a regulated chopped dc output (52) for powering electrical appliances. Regulating means (15) for regulating rectified low voltage output (B<+>) of the low voltage winding of the alternator. The regulating means (15) being operable in two modes, a car mode in which the rectified low voltage output (B<+>) is connected to a battery (124) for charging said battery and energising the alternator excitation winding (134) at battery voltage, and in a power mode in which the battery (124) is disconnected from the rectified low voltage output (B<+>), and the excitation winding (134) is energised from the star point (N) of the low voltage winding of the alternator, this excitation being used to boost the power output (B<+>) for use in welding, etc. |
