1
Hamilton Billy Harold, Meszar John Robert, Ostapiak Roman, Schroeder Robert Edward, Untamo Peter Pentti: Serially-connected converters having multiple regulation modes for use in supplying serially-connected loads on long lines. Bell Telephone Laboratories Incorporated, Wisner Wilford L, June 18, 1974: US3818307 (37 worldwide citation)

These serially connected converters have multiple regulation modes including a new normal mode in which the current-versus-voltage characteristic has a substantial negative slope. This mode produces better load sharing among the serially connected converters than would a constant-current mode of ope ...


2
Bishop John Daniel, Judd Frank Fuller, Schroeder Robert Edward, Untamo Peter Pentti: Balanced current regulator with current-balance-responsive feedback control circuit. Bell Telephone Laboratories Incorporated, November 30, 1971: US3624405 (15 worldwide citation)

A current regulator to supply two balanced regulated currents of opposite polarity utilizes separate sum and difference current-sensing transformers to generate feedback control signals. These feedback signals control the operation level of a saturable reactor which regulates the drive signal to the ...


3
Untamo Peter Pentti: Parallel inverter with saturable reactor current control. Bell Telephone Laboratories Incorporated, Logan H L, April 23, 1974: US3806792 (7 worldwide citation)

Control of the output current of a parallel type of power inverter is achieved through the addition of a pair of diodes and saturable reactor structure having a pair of cores. Each of the cores has a pair of gate windings which are serially connected with the inverter switching devices, respectively ...