Browse Prior Art Database

Universal Commutating Regulator

IP.com Disclosure Number: IPCOM000081851D
Original Publication Date: 1974-Aug-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Calvo, R: AUTHOR [+3]

Abstract

This circuit provides multiple, individually regulated voltages of positive and negative polarities. The basic concept is to charge an inductor from the available voltage source and then to commutate the inductor's energy to the various outputs.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Universal Commutating Regulator

This circuit provides multiple, individually regulated voltages of positive and negative polarities. The basic concept is to charge an inductor from the available voltage source and then to commutate the inductor's energy to the various outputs.

Inductor L is charged with energy from a source E when transistors Q1 and Q2 are turned on. Then, by turning off transistor Q1 while leaving Q2 on, point X will go negative due to the inductive kick of L. By turning on Q3, capacitor C1 can be charged to some negative value. The length of time that Q3 is on will determine the voltage to which C1 will charge (V1). The control circuit senses V1 and turns off Q3 when C1 is charged to the desired level. The control then turns on Q1 again to recharge L (Q2 still on). Once the inductor is recharged, Q1 is turned off and Q4 turned on so that the inductor now charges C2. Thus, both negative output capacitors will be charged.

Similarly, by turning off Q2 (with Q1 on) after charging the inductor, and then turning on Q5, C3 will be charged by the inductor through Q1 and Q5. Likewise, C4 is charged by turning on Q1 and Q6. Thus, both positive output capacitors may be charged.

The energy stored in L per cycle is:

(Image Omitted)

It is not necessary that the inductor current drop to zero before recharging: in fact, lower peak currents will result if it does not.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]