公开(公告)号：DE2225094A1

公开(公告)日：1973-01-11

申请号：DE2225094

申请日：1972-05-24

Applicant: IBM

Inventor： GUNN JOHN BATTISCOMBE

IPC: H02M3/07 ,  H02M3/10

Abstract: Transformerless high DC to low DC voltage conversion is achieved by alternately charging a plurality of capacitors in series from the input voltage source, and discharging them in parallel into the load. The charging and discharging are effected by transistor switches, which are in turn controlled by the voltage across one of the plurality of capacitors. Charging stops, and discharging begins, when this voltage rises above a first predetermined value; discharging stops, and charging begins, when this voltage falls below a second, lower, predetermined value. During charging, voltage across the load is maintained by a permanently connected reservoir capacitor. The difference between the predetermined voltage values, and hence the ripple on the output voltage, is preselected by certain circuit constants, whereas the mean of the two values is controlled by comparing the DC component of the output voltage with a reference value, so as to maintain the DC load voltage constant despite variations in load current.

公开(公告)号：DE1228316B

公开(公告)日：1966-11-10

申请号：DEJ0021001

申请日：1961-12-12

Applicant: IBM

Inventor： GUNN JOHN BATTISCOMBE

IPC: H03B19/05

公开(公告)号：DE3064246D1

公开(公告)日：1983-08-25

申请号：DE3064246

申请日：1980-06-24

Applicant: IBM

Inventor： GHEZ RICHARD ANGELO ,  GUNN JOHN BATTISCOMBE ,  HAMMER ROBERT ,  VAN VECHTEN JAMES ALDEN

IPC: C23F1/00 ,  C23F1/04

Abstract: A pressure differential is provided across substrate 1 having hole 21A-G to be etched to a specific dimension by means of an etchant which forms menisci extending across each hole opening 22A-G. The etchant is retained in each hole due to its surface tension and under the pressure differential is drawn partly through hole openings 22A-G. When hole openings 22A-G reach the specific desired dimension, the etchant is drawn out of the holes by the pressure differential and etching stops.

公开(公告)号：DE2249646A1

公开(公告)日：1973-06-07

申请号：DE2249646

申请日：1972-10-11

Applicant: IBM

Inventor： GUNN JOHN BATTISCOMBE ,  STAPLES JOHN LEROY

IPC: G01R19/14 ,  G01R31/08 ,  H01Q1/00 ,  G01R31/00

Abstract: A procedure is described for locating the source of electrical noise generated in any branch of an electrical power distribution network. A noise probe, consisting of a small coil mounted in an insulated housing which is held near a power supply line to inductively couple to the magnetic field of the noise current present in that line, is employed to find the source of electrical noise.