Lighting apparatus including a current bleeder module for sinking current during dimming of the lighting apparatus and methods of operating the same
First Claim
Patent Images
1. A lighting apparatus, comprising:
- an input power terminal;
a light source element coupled to the input power terminal; and
a current bleeder module that is connected to the input power terminal and comprises a detector circuit that is configured to detect a change in voltage per unit of time of a phase cut input power signal received at the input power terminal, the current bleeder module being configured, responsive to the change in voltage per unit of time of the phase cut input power signal, to draw a current from the input power terminal during a first portion of a period of the phase cut input power signal and being configured as an open circuit so as not to draw current from the input power terminal during a second portion of the period of the phase cut input power signal.
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Abstract
A lighting apparatus includes an input power terminal, a light source element coupled to the input power terminal, and a current bleeder module that is connected to the input power terminal and is configured to draw a current from the input power terminal responsive to a phase cut input power signal received at the input power terminal during a first portion of a period of the phase cut input power signal and is configured as an open circuit so as not to draw current from the input power terminal during a second portion of the period of the phase cut input power signal.
47 Citations
28 Claims
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1. A lighting apparatus, comprising:
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an input power terminal; a light source element coupled to the input power terminal; and a current bleeder module that is connected to the input power terminal and comprises a detector circuit that is configured to detect a change in voltage per unit of time of a phase cut input power signal received at the input power terminal, the current bleeder module being configured, responsive to the change in voltage per unit of time of the phase cut input power signal, to draw a current from the input power terminal during a first portion of a period of the phase cut input power signal and being configured as an open circuit so as not to draw current from the input power terminal during a second portion of the period of the phase cut input power signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method, comprising:
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generating a phase cut input power signal responsive to a power signal; and detecting a change in voltage per unit of time of a phase cut input power signal; and drawing a current from an input power terminal during a first portion of a period of the phase cut input power signal and not drawing current from the input power terminal during a second portion of the period of the phase cut input power signal, responsive to the change in voltage per unit of time of the phase cut input power signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 27, 28)
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25. A method, comprising:
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generating a constant polarity phase cut input power signal responsive to a power signal; and drawing a current from an input power terminal during a first portion of a period of the constant polarity phase cut input power signal and not drawing current from the input power terminal during a second portion of the period of the constant polarity phase cut input power signal.
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26. A method, comprising:
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generating a leading edge phase cut input power signal responsive to a power signal; and drawing a current from an input power terminal during a first portion of a period of the leading edge phase cut input power signal and not drawing current from the input power terminal during a second portion of the period of the leading edge phase cut input power signal.
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Specification