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An Application of Pulse Modulation to Power Supply Miniaturization

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2 Author(s)
Calkin, E.T. ; Bell Telephone Laboratories, Inc., Whippany, N. J. ; Judd, F.F.

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.

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Applications and Industry, IEEE Transactions on  (Volume:83 ,  Issue: 75 )