Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1984-07-17
1986-01-28
Wong, Peter S.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
318762, 363 37, H02M 7515
Patent
active
045675554
ABSTRACT:
In a current type GTO inverter, commutation surge voltage is inevitably generated from an inductive load whenever each GTO is turned off. The commutation surge voltage thus generated is once stored in a capacitor (C.sub.1) through a diode surge voltage rectifier (5) and then restored to the DC source terminals (3A, 3B) of the GTO bridge-connected inverter (3) through a pair of other GTOs (G.sub.7, G.sub.8) turned on during steady state intervals of inverter commutation. Magnetic energy stored in a reactor (Lr.sub.1, Lr.sub.2) in motor-driving operation is recharged to the capacitor (C.sub.1) through the diode surge voltage rectifier (5) after the GTOs (G.sub.7, G.sub.8) have been turned off; the motor kinetic energy stored in the capacitor (C.sub.1) through diodes (D.sub.8, D.sub.9) in motor-braking operation is regenerated to the AC source side of the inverter (3) through a pair of other GTOs (G.sub.9, G.sub.10) when the voltage across the capacitor (C.sub.1) exceeds a predetermined value, and magnetic energy stored in the reactor (Lr.sub.1, Lr.sub.2) in motor-braking operation is recharged to the capacitor (C.sub.1) through diodes (D.sub.12, D.sub.13) after the GTOs (G.sub.9, G.sub.10) have been turned off. The circuit operation is stable at higher frequency range because no vibration circuits are provided, and the energy conversion efficiency is high because every energy loss is effectively restored to the inverter or the power source side.
REFERENCES:
patent: 3825813 (1974-07-01), Wirtz
patent: 4072882 (1978-02-01), Wiart et al.
patent: 4087851 (1978-05-01), Klautschek
patent: 4326246 (1982-04-01), Winkler et al.
Hashimoto Hitoshi
Matsuse Kohki
Suzuki Toshiaki
Kabushiki Kaisha Meidensha
Rebsch D. L.
Wong Peter S.
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