Gating control for a static switching arrangement with improved dynamic response
AssigneeGeneral Electric Company
InventorFred W. Kelley, Jr.
Life of this patent
Estimating the term…
Abstract
To control the gating angles and hence the subsequent conduction angles of a complementary pair of alternately fired controllable electric valves, there is provided during intermittent intervals when neither valve is conducting a gating control signal which depends on the sum of a control signal indicative of a desired conduction angle, an on-time indicating signal indicative of the actual conduction angle of the last conducting valve, and an off-time indicating signal that varies with the duration of the non-conducting interval. Each time the gating control signal reaches a predetermined threshold level, the next to conduct valve is fired.
Claims8
A gating control for a complementary pair of alternately conducting controllable electric valves which are cyclically fired at gating angles that can be varied to control the subsequent conduction angel of each valve in turn, said gating control comprising:
- a. first means for supplying a control signal having a magnitude indicative of the conduction angles desired for said valves;
- b. second means for developing an on-time indicating signal having a magnitude during each of the intermittent intervals when neither valve is conducting that is proportional to the actual conduction angle of the last conducting valve;
- c. third means for developing an off-time indicating signal that varies in magnitude as a function of the duration of each of said intermittent non-conducting intervals;
- d. summing means connected to said first, second, and third means and effective during each non-conducting interval for providing a gating control signal the magnitude of which depends on the sum of all three of said signals;
- and
- e. means responsive to said gating control signal for initiating the firing of the next to conduct valve when said gating control signal reaches a predetermined threshold level.
Dependencies are inferred from the claim text.