Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1980-09-15
1982-03-09
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
307252B, 307252M, 363 57, 363 58, H02M 7515, H03K 1773
Patent
active
043193188
ABSTRACT:
A circuit for commutating a thyristor (21) by shunting its current for a minimum interval, thereby removing sustaining voltage to said thyristor, then subsequently restoring voltage to said thyristor at a predetermined rate, utilizes a series combination of a commutation electronic switch (22) and an isolated dc voltage supply (23) connected in parallel with the thyristor. The voltage supply is arranged with a polarity that permits the current flowing through the thyristor in one direction to be bypassed through the series combination while the commutation switch is turned on and to reverse bias the thyristor when the commutation switch is fully on. A dv/dt control circuit (24) limits the rate of rise of voltage across the commutation switch (22) as it is turned off in response to a command input signal. The dv/dt control circuit is comprised of a constant current drive (31) and a capacitor (32) connected between the output terminal of the commutation switch and the control input terminal of the commutation switch. The thyristor may be a triac (40) with two commutation switches (42, 43), one for current of each polarity, or with a single commutation switch (55) and a bridge circuit (52-55) for selecting the polarity of the switch (56).
REFERENCES:
patent: 3694670 (1972-09-01), Marzolf
patent: 3872364 (1975-03-01), Hubner
patent: 3928775 (1975-12-01), Steigerwald
patent: 4107551 (1978-08-01), Akamatsu
SCR Manual, Fifth Edition, G.E. Co., 1977, pp. 63-67, 133 & 139-141.
German Publication "Elektrische Bahnen", 77 (1979), H. 11, by Bohm & Kruger, pp. 306-312.
Edwards Dean B.
Rippel Wally E.
Beha Jr. William H.
California Institute of Technology
LandOfFree
Voltage reapplication rate control for commutation of thyristors does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Voltage reapplication rate control for commutation of thyristors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Voltage reapplication rate control for commutation of thyristors will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1844138