Cirrus Logic Inc.

Koninklijke Philips Corporation N.v.

Philips Lighting Holding B.v.

Philips International, B.v.

Yanhui Xie

Michael Allan Kost

John L Melanson

Eric Jerome King

Zhaohui He

Sahil Singh

Chris Michael Franklin

Robert Thomas Grisamore

Jean Charles Pina

Poornima Mazumdar

Jean-Charles Pina

Richard Dean Putman

A system and method for providing compatibility between a load and a secondary winding of a magnetic transformer driven at its primary winding by a trailing-edge dimmer may include determining from a magnetic transformer secondary signal a period of a half-line cycle of an output signal of the dimmer, determining from the magnetic transformer secondary signal an estimated occurrence of an end of a phase-cut angle of the dimmer, and generating a driving signal to the load based on the period and the estimated occurrence of the end of the phase-cut angle. A lamp assembly may include a lamp for generating light and a controller for controlling operation of the lamp, the controller comprising a timing control circuit for determining a period of a periodic signal received by the lamp assembly.

Systems and methods for low-power lamp compatibility with a leading-edge dimmer and a magnetic transformer

In accordance with embodiments of the present disclosure, an apparatus may comprise a controller to provide compatibility between a load and a secondary winding of an electronic transformer. The controller may be configured to operate a single-stage power converter in a first power mode for a first period of time, such that the single-stage power converter is enabled to transfer energy from the secondary winding to the load during the first power mode and operate the single-stage power converter in a second power mode for a second period of time prior to the first period of time, such that the single-stage power converter is enabled to transfer energy from the secondary winding to the load during the second power mode, wherein the first power mode and the second power mode occur within a half-line cycle of an electronic transformer secondary signal present on the secondary winding.

Systems and methods for low-power lamp compatibility with a trailing-edge dimmer and an electronic transformer

A power distribution system includes controller of a switching power converter to control the switching power converter and determine one or more switching power converter control parameters. In at least one embodiment, the switching power converter utilizes a transformer to transfer energy from a primary-side of the transformer to a secondary-side of the transformer. In at least one embodiment, the switching power converter control parameters includes a secondary-side conduction time delay that represents a time delay between when the primary-side ceases conducting a primary-side current and the secondary-side begins to conduct a secondary-side current. In at least one embodiment, determining and accounting for this secondary-side conduction time delay increases the prediction accuracy of the secondary-side current value and accurate delivery of energy to a load when the controller does not directly sense the secondary-side current provided to the load.

Utilizing secondary-side conduction time parameters of a switching power converter to provide energy to a load

A power system includes a controller to control a switching power converter, and the controller is configured to automatically transition operation of the switching power converter, during each cycle of an input voltage to the switching power converter, between operating in discontinuous conduction mode and critical conduction mode.

Controlling power factor in a switching power converter operating in discontinuous conduction mode

A controller may be configured to: (i) predict based on an electronic transformer secondary signal an estimated occurrence of a high-resistance state of a trailing-edge dimmer coupled to a primary winding of an electronic transformer, wherein the high-resistance state occurs when the trailing-edge dimmer begins phase-cutting an alternating current voltage signal; (ii) operate a power converter in a trailing-edge exposure mode for a first period of time immediately prior to the estimated occurrence of the high-resistance state, such that the power converter is enabled to transfer energy from the secondary winding to the load during the trailing-edge exposure mode; and (iii) operate the power converter in a power mode for a second period of time prior to and non-contiguous with the first period of time, such that the power converter is enabled to transfer energy from the secondary winding to the load during the power mode.

In accordance with these and other embodiments of the present disclosure, a system and method for providing compatibility between a load and a secondary winding of an electronic transformer driven by a trailing-edge dimmer may include predicting based on an electronic transformer secondary signal 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 voltage signal and operating the load in a high-current mode for a period of time immediately prior to the estimated occurrence of the high-resistance state.

According to systems and methods of this disclosure, a controller may be configured to: operate in a first compatibility mode of operation, determine from an input signal of the lamp assembly during operation in the first compatibility mode whether the first compatibility mode of operation provides compatibility between the lamp assembly and a power infrastructure to which it is coupled, select the first compatibility mode of operation from a plurality of modes of operation as a compatibility mode responsive to determining that the first compatibility mode of operation provides compatibility between the lamp assembly and a power infrastructure to which it is coupled, and select a second compatibility mode of operation from the plurality of modes of operation as the compatibility mode responsive to determining that the first compatibility mode of operation does not provide compatibility between the lamp assembly and the power infrastructure to which it is coupled.

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Austin, TX, United States of America

Yanhui Xie