Adaptive Current Control Timing and Responsive Current Control for Interfacing with a Dimmer
First Claim
1. A method comprising:
- predicting a time period during a cycle of a phase-cut input voltage to a power converter system that is expected to occur in advance of a leading edge of the phase-cut input voltage; and
during the cycle of the phase-cut input voltage, actively controlling a decreasing transition rate of a current conducted through a dimmer at least by the predicted time period that is expected to occur in advance of the leading edge of the phase-cut input voltage.
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Accused Products
Abstract
In at least one embodiment, an electronic system adapts current control timing for half line cycle of a phase-cut input voltage and responsively controls a dimmer current in a power converter system. The adaptive current control time and responsive current control provides, for example, interfacing with a dimmer. The electronic system and method include a dimmer, a switching power converter, and a controller to control the switching power converter and controls a dimmer current. In at least one embodiment, the controller determines a predicted time period from a zero crossing until a leading edge of a phase-cut input voltage and then responsively controls the dimmer current to, for example, reduce current and voltage perturbations (referred to as “ringing”), improve efficiency, and reduce an average amount of power handled by various circuit components.
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Citations
28 Claims
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1. A method comprising:
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predicting a time period during a cycle of a phase-cut input voltage to a power converter system that is expected to occur in advance of a leading edge of the phase-cut input voltage; and during the cycle of the phase-cut input voltage, actively controlling a decreasing transition rate of a current conducted through a dimmer at least by the predicted time period that is expected to occur in advance of the leading edge of the phase-cut input voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus comprising:
a controller configured to; predict a time period during a cycle of a phase-cut input voltage to a power converter system that is expected to occur in advance of a leading edge of the phase-cut input voltage; and during the cycle of the phase-cut input voltage, actively control a decreasing transition rate of a current conducted through a dimmer at least by the predicted time period that is expected to occur in advance of the leading edge of the phase-cut input voltage. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An apparatus comprising:
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a switching power converter; a controller coupled to the switching power converter and configured to; predict a time period during a cycle of a phase-cut input voltage to a power converter system that is expected to occur in advance of a leading edge of the phase-cut input voltage; and during the cycle of the phase-cut input voltage, actively control a decreasing transition rate of a current conducted through a dimmer at least by the predicted time period that is expected to occur in advance of the leading edge of the phase-cut input voltage; and a load coupled to the switching power converter. - View Dependent Claims (28)
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Specification