Method and system of controlling effective value of alternating

Details Method and system of controlling effective value of alternating Method and system of controlling effective value of alternating

1979-04-13

1981-06-02

Pellinen, A. D.

Electricity: power supply or regulation systems

Output level responsive

Phase controlled switching using electronic tube or a three...

323246, G05F 1455

Patent

active

042713870

ABSTRACT:
In a method and system of controlling the effective value of alternating current supplied to a load through controlled semiconductor switching elements which are connected in parallel opposition, circuits are provided to produce data ##EQU1## where .DELTA.I represents an increment of the load current, .DELTA..alpha. an increment of the ignition angle .alpha. and I.sub.90 the effective value of the load current at an ignition angle of 90.degree.. .DELTA..alpha. is calculated according to an equation ##EQU2## where K is a constant smaller than 1. Then .DELTA..alpha. is added to an ignition angle .alpha..sub.1 in a preceding half cycle to determine a new ignition angle which is used to control the controlled semiconductor switching elements.

REFERENCES:
patent: 4000455 (1976-12-01), Gyueyi et al.
patent: 4147910 (1979-04-01), Kiuchi et al.
patent: 4158164 (1979-06-01), Nutz

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