TRAILING EDGE DIMMER COMPATIBILITY WITH DIMMER HIGH RESISTANCE PREDICTION

• US 20130342123A1
• Filed: 08/28/2013
• Published: 12/26/2013
• Est. Priority Date: 11/16/2010
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Cirrus Logic Incorporated
• Inventors: Melanson, John L., King, Eric J.
• Granted Patent: US 9,155,163 B2
• Time in Patent Office: Days
• US Class Current: 315/200.R
• CPC Class Codes: H05B 39/048 with reverse phase control
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/3575 by means of dummy loads or bleeder circuits, e.g. for dimmers
• CPC Class Codes: H05B 45/3725 Switched mode power supply [SMPS]
• CPC Class Codes: H05B 45/38 using boost topology
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

In at least one embodiment, an electronic system includes a controller, and the controller provides compatibility between an electronic light source and a trailing edge dimmer. In at least one embodiment, the controller is capable of predicting an estimated occurrence of a trailing edge of a phase cut AC voltage and accelerating a transition of the phase cut AC voltage from the trailing edge to a predetermined voltage threshold. In at least one embodiment, the controller predicts an estimated occurrence of the trailing edge of the phase cut AC voltage on the basis of actual observations from one or more previous cycles of the phase cut AC voltage.

Claims

1. An apparatus comprising:

a controller to provide compatibility between a lamp and a trailing edge dimmer, wherein the controller is capable to;

predict an estimated occurrence of a high resistance state of the trailing edge dimmer, wherein the high resistance state occurs when the trailing edge dimmer begins phase cutting an alternating current (AC) voltage signal;

operate in a high current mode based on the estimated predicted occurrence of the high resistance state of the trailing edge dimmer; and

operate in a low impedance mode after the AC voltage signal reaches a low voltage threshold.

2-40. -40. (canceled)