Method and apparatus for varying the power in a load connected t

Electricity: power supply or regulation systems – Output level responsive – Phase controlled switching using electronic tube or a three...

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323237, 323320, 327457, 327447, G05F 1455

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active

053732243

ABSTRACT:
A method for regulating the power in a load connected to the mains through a controlled switch and a device for implementing the method. The method includes the following steps: detecting a mains synchronization pulse, which determines the start of a cycle, within a fixed time interval of the preceding cycle; as soon as the pulse has been detected, waiting for the end of the fixed interval, then counting down a first time interval that substantially corresponds to a selected time interval; at the end of the first time interval, triggering the switch on and counting down a second time interval that ends before the normal arrival of the next synchronization pulse; and at the end of the second time interval, counting down the fixed time interval within which the next synchronization pulse must be detected.

REFERENCES:
patent: 4771224 (1988-09-01), Elms
patent: 5159657 (1992-10-01), Runggaldier et al.

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