Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1982-05-24
1984-06-26
Dixon, Harold
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315208, 315247, 315287, 315DIG4, G05F 100, H05B 3702
Patent
active
044568550
ABSTRACT:
Intensity regulator, especially a light regulator which can be adapted to the regulation of the light intensity of both compensated and uncompensated illuminators connected to the alternating-current mains. The regulator comprises one or more switch elements (S1, S2) disposed in a circuit between the mains and an illuminator (L) as well as a control logic circuit (4) for the switch element or elements, said circuit upon the intensity regulation breaking the supply current at least once on each half-cycle when current has been conducted from the O-moment of a half-cycle to the moment according to a set value. On one hand, a problem is the elimination of current peaks produced by voltage differences at a switch-on moment and, on the other hand, the arrangement of a control for the switch elements. To overcome the problem, the switch element (S1) is a double-switch two-way switch element connected in series with a load (L) and controlled on each half-cycle to break the current only from the mains towards the load but to permit the current flow in the opposite direction. The other two-way switch element (S2) is coupled parallel to load (L) and controlled on each half-cycle to block the current flow in the direction of the mains voltage but to permit the oppositely directed current flow therethrough. In order to determine the current breaking moment of the switches of the first switch element (S1), the control logic circuit is provided with an integrator, a mains voltage O-moment sensor and reference voltage setting means, whereby from the O-moment of the mains voltage, with the integrated voltage reaching a set reference voltage, the integrator provides a control data to a comparator logic for breaking the current of switch element (S1) in said direction.
REFERENCES:
patent: 4076996 (1978-02-01), Maehara et al.
patent: 4220896 (1980-09-01), Paice
patent: 4277728 (1981-07-01), Stevens
patent: 4356433 (1982-10-01), Linden
Dixon Harold
OY Helvar
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