Lamp transformer for use with an electronic dimmer and method for use thereof for reducing acoustic noise
First Claim
1. A method for reducing acoustic noise produced during use of a lamp dimmer, the method comprising:
- (a) detecting that a dimmer is present, and if so;
i) detecting whether the dimmer is a leading edge dimmer or a trailing edge dimmer, ii) if the dimmer is a leading edge dimmer, reducing the rate of rise of the leading edge, and iii) if the dimmer is a trailing edge dimmer, reducing the rate of fall of the trailing edge.
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Accused Products
Abstract
A controller for reducing acoustic noise produced during use of a leading edge dimmer, includes a leading edge controller responsive to an input voltage fed thereto for producing a control signal upon detection of a leading edge, and a linear switch coupled to the leading edge controller and responsive to the control signal for linearly switching the input voltage so that a rate of rise of the leading edge is decreased. A trailing-edge controller may be coupled to a leading-trailing edge detector and responsive to detection of a trailing edge dimmer for disabling the leading edge controller and decreasing a rate of decline of the trailing edge of the input voltage.
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Citations
20 Claims
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1. A method for reducing acoustic noise produced during use of a lamp dimmer, the method comprising:
(a) detecting that a dimmer is present, and if so;
i) detecting whether the dimmer is a leading edge dimmer or a trailing edge dimmer, ii) if the dimmer is a leading edge dimmer, reducing the rate of rise of the leading edge, and iii) if the dimmer is a trailing edge dimmer, reducing the rate of fall of the trailing edge. - View Dependent Claims (2)
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3. A controller for reducing acoustic noise produced during use of a leading edge dimmer, the controller comprising:
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a leading edge controller responsive to an input voltage fed thereto for producing a control signal upon detection of a leading edge, and a linear switch coupled to the leading edge controller and responsive to the control signal for linearly switching the input voltage so that a rate of rise of the leading edge is decreased. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An electronic transformer including a controller for reducing acoustic noise produced during use of a leading edge dimmer, the controller comprising:
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a leading edge controller responsive to an input voltage fed thereto for producing a control signal upon detection of a leading edge, and a linear switch coupled to the leading edge controller and responsive to the control signal for linearly switching the input voltage so that a rate of rise of the leading edge is decreased. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification