Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1977-11-21
1979-06-12
Shoop, William M.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363131, H02M 118
Patent
active
041582241
ABSTRACT:
A method and an apparatus consisting of at least one inverter for converting a d.c. supply voltage to an alternating voltage for application across a load. More specifically, an inverter is disclosed consisting of two power darlington transistors having their collectors connected to an input of a load, a power supply having upper and lower supply voltage outputs connected to the emitters of the two transistors, and unique drive circuitry for alternately biasing each of the transistors on and off through control of their respective base terminals with voltages equal to or referenced to the upper and lower supply voltage outputs. The drive circuitry does not utilize transformers and incorporates circuitry which prevents simultaneous conduction of the two transistors. Also disclosed is an apparatus in which a separate inverter is connected across each of the three windings of a three phase synchronous motor, each inverter being controlled by a separate square wave clock pulse which is 120 degrees out of phase with the other two clock pulses.
REFERENCES:
patent: 3492496 (1970-01-01), Callan
patent: 3506846 (1970-04-01), Niemann
patent: 3518457 (1970-06-01), Herrmann et al.
patent: 3585407 (1971-06-01), Vinson
patent: 3649851 (1972-03-01), Cohen
patent: 3725679 (1973-04-01), Darrow
patent: 3751682 (1973-08-01), Howe
patent: 4051426 (1977-09-01), Wood
Kreyer Lawrence
Matherly Thomas G.
Shoop William M.
Unilog Systems Corporation
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