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Controlled Regenerative Switching Regulator Drive

IP.com Disclosure Number: IPCOM000082313D
Original Publication Date: 1974-Nov-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Duspiva, WS: AUTHOR [+2]

Abstract

Transistor Q1, together with rectifier CR7, inductor L1 and capacitor C3 form a switching regulator circuit. The source of power for the regulator is E bulk and the load is RL. The regenerative drive scheme is shown schematically in the drawing as transformer T1, transistors Q2, Q3, Q4, Q5 and Q6, and their associated components.

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Controlled Regenerative Switching Regulator Drive

Transistor Q1, together with rectifier CR7, inductor L1 and capacitor C3 form a switching regulator circuit. The source of power for the regulator is E bulk and the load is RL. The regenerative drive scheme is shown schematically in the drawing as transformer T1, transistors Q2, Q3, Q4, Q5 and Q6, and their associated components.

Transistor Q1 is turned on by turning on Q3 for a brief period of time (brief compared to the overall period of operation). The polarities of the windings on the transformer T1 are such that once Q1 turns on, base drive current will flow through n3 due to the current flowing through n4. This ratio of the base drive to the emitter current is equal to n4/n3. Since T1 acts as a current transformer from the emitter to base of Q1, Q3 may be turned off once Q1 is on. The time constant (R1 + R2) x C1 determines the length of time that Q3 is on and this period should be short compared to the overall duty cycle, in order to optimize the efficiency of the drive circuitry.

To turn off Q1, Q2 is turned on. This in turn causes Q5 to turn off and Q4 to saturate. For a closely coupled transformer T1, Q6 will remain "on" until the storage period of Q1 is complete. The value of C2 should be chosen so that Q4 will be on during the fall time of Q1 but no longer, in order to optimize the efficiency of the drive circuit during the time when Q1 is off.

Additional factors which directly affect the design of the...