An Application of Pulse Modulation to Power Supply Miniaturization

A significant improvement in the miniaturization of an a-c to d-c power supply has been achieved by a circuit which combines pulse-amplitude and pulse-duration modulation to provide constant area pulses. The modulation is obtained in an inverter-regulator circuit which employs a saturating 2-core high-frequency transformer and gate turn-off semiconductor switches. The principal contributions to miniaturization are the elimination of the 60-cycle power transformer and the reduction in size of the filter circuit components.