Dead angle compensation using inductor in DC-to-DC converter

An analysis of a circuit for dead angle compensation in a DC-to-DC converter controlled by a magnetic amplifier is presented. This circuit suppresses the dead angle so that the core loss can be reduced without spoiling the current surge suppression characteristics of the magnetic amplifier. The magnetizing characteristics of the core containing the saturation inductance and the reverse recovery of the diode are modeled. The control characteristics of the converter with the compensation circuit can then be expressed analytically and the limit of compensation derived theoretically. It is found that there is a condition of the inductor in the circuit for which the head angle caused by the recovery of the diode is reduced to zero. Compensation is limited by the saturation inductance of the core. Therefore, a core of good rectangularity has to be used at high frequency.<
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