Phase controlled dimmer using a narrow band quadrature...

Details Phase controlled dimmer using a narrow band quadrature... Phase controlled dimmer using a narrow band quadrature...

2011-06-07

2011-06-07

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

C329S308000, C315S194000

Reexamination Certificate

active

07956694

ABSTRACT:
A modified Costas control loop (80) using switched analog low pass filters (R2, C1, C2) (R3, C3, C4) and rectangular to polar conversion (341) computes an angular phase reference error that is processed by a digital loop filter (342) to control a counter (441) and a state machine (442) that are used to control the gating of a controllably conductive circuit (84) interposed between an AC source (81) and a phase-controlled load (83) such as a dimmable lamp.

REFERENCES:
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patent: 4797599 (1989-01-01), Ference
patent: 5065107 (1991-11-01), Kumar et al.
patent: 5315270 (1994-05-01), Leonowich
patent: 5430356 (1995-07-01), Ference
patent: 6091205 (2000-07-01), Newman
patent: 6380692 (2002-04-01), Newman
patent: 7019469 (2006-03-01), Thurk

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