Gate circuit for hard driven GTO
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 20, 1996
Grant Date -
N/A
app pub date -
Apr 28, 1993
filing date -
Nov 2, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a circuit for hard driving a GTO, the conductor inductance (L1) and the internal inductance of the GTO (L2) form, together with a first capacitor (C1) situated in parallel via a switch (S), a series resonance circuit inside the gate circuit. In this connection, the chosen sizes of the first capacitor (C1) and of the first inductance (L1) are such that, if the first capacitor (C1) discharges via the two inductances (L1, L2), the gate current originating from the first capacitor (C1) exceeds half the value of a GTO anode current to be turned off within less than 5 .mu.s in the first quarter cycle of the series oscillatory circuit. Moreover, first means are provided which uncouple the first capacitor (C1) from the generation of the gate current after the first quarter cycle of the resonance circuit and allows the gate current to decay slowly in such a way that, at any time, it is greater than the tail current of the GTO. Finally, second means are provided in the form of a recharging circuit, which means are activated during the decay of the gate current and apply a holding current (V.sub.H) which is sufficient for blocking the gate (G) of the GTO after the decay of the gate current.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully