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Dual Mode Switching Regulator

IP.com Disclosure Number: IPCOM000082482D
Original Publication Date: 1974-Dec-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Duspiva, WS: AUTHOR [+2]

Abstract

The configuration composed of Q1, D1, the primary of L1 and C1 is that of a direct-coupled switching regulator. Secondary windings N2, N3, N4 ... are added to L1 so as to provide additional regulated output voltages V2, V3, V4 ... transformer coupled to the regulator. N2, N3 and N4 are used in the flyback mode, so as to provide energy to output filter capacitors C2, C3, C4 when the switching device Q1 turns OFF during each cycle. This energy is part of the energy built up in inductor L1 during the ON time of Q1.

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Dual Mode Switching Regulator

The configuration composed of Q1, D1, the primary of L1 and C1 is that of a direct-coupled switching regulator. Secondary windings N2, N3, N4 ... are added to L1 so as to provide additional regulated output voltages V2, V3, V4 ... transformer coupled to the regulator. N2, N3 and N4 are used in the flyback mode, so as to provide energy to output filter capacitors C2, C3, C4 when the switching device Q1 turns OFF during each cycle. This energy is part of the energy built up in inductor L1 during the ON time of Q1.

Output voltages V2, V3, V4 are related to the output of the direct path, V1, by the following expressions:.

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Thus regulation of the additional voltages V2, V3 and V4 is accomplished as a result of regulation of V1.

The basic design considerations must include an assurance that the energy stored in L1, when Q1 is ON, is capable of powering the loads across V2, V3 and V4 without bringing the current through N1 to zero. This current is required to forward bias free-wheeling diode D1, so as to provide the relation of V2, V3 and V4 to V1 according to the above equations.

So long as these relationships are maintained, a single pulse-width modulator (PWM) control suffices to regulate all of the outputs.

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