Frequency converted dimming signal generation
First Claim
1. A lighting control circuit comprising:
- a duty cycle detection circuit configured to generate a first periodic waveform having a detection circuit duty cycle and detection circuit frequency corresponding to an input waveform duty cycle and input waveform frequency;
an averaging circuit responsive to the duty cycle detection circuit and configured to generate a first signal having a voltage level corresponding to the detection circuit duty cycle;
a waveform generator configured to output a second periodic waveform having a waveform generator frequency different from the input waveform frequency; and
a comparator circuit configured to compare the second periodic waveform with the first signal to generate a comparator waveform having a comparator circuit duty cycle corresponding to the input waveform duty cycle and a comparator circuit frequency corresponding to the waveform generator frequency.
4 Assignments
0 Petitions
Accused Products
Abstract
There is provided a lighting control circuit comprising a duty cycle detection circuit, an averaging circuit, a waveform generator and a comparator circuit. The duty cycle detection circuit generates a first periodic waveform having a duty cycle and frequency corresponding to an input waveform duty cycle and frequency. The averaging circuit generates a first signal having a voltage level corresponding to the duty cycle of the first periodic waveform. The waveform generator outputs a second periodic waveform having a frequency different from the input waveform frequency. The comparator circuit compares the second periodic waveform with the first signal to generate an output waveform having a duty cycle corresponding to the input waveform duty cycle and a frequency corresponding to the frequency of the second periodic waveform. Also, there are provided methods.
133 Citations
32 Claims
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1. A lighting control circuit comprising:
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a duty cycle detection circuit configured to generate a first periodic waveform having a detection circuit duty cycle and detection circuit frequency corresponding to an input waveform duty cycle and input waveform frequency; an averaging circuit responsive to the duty cycle detection circuit and configured to generate a first signal having a voltage level corresponding to the detection circuit duty cycle; a waveform generator configured to output a second periodic waveform having a waveform generator frequency different from the input waveform frequency; and a comparator circuit configured to compare the second periodic waveform with the first signal to generate a comparator waveform having a comparator circuit duty cycle corresponding to the input waveform duty cycle and a comparator circuit frequency corresponding to the waveform generator frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A lighting control circuit comprising:
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means for generating a first periodic waveform having a first waveform duty cycle and first waveform frequency corresponding to an input waveform duty cycle and input waveform frequency; means for generating a first signal having a voltage level corresponding to the first waveform duty cycle; means for outputting a second periodic waveform having a second waveform frequency different from the input waveform frequency; and means for comparing the second periodic waveform with the first signal to generate a comparison waveform having a comparison waveform duty cycle corresponding to the input waveform duty cycle and a comparison waveform frequency corresponding to the second waveform frequency. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of controlling lighting, comprising:
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generating a first periodic waveform having a first waveform duty cycle and first waveform frequency corresponding to an input waveform duty cycle and input waveform frequency; generating a first signal having a voltage level corresponding to the first waveform duty cycle; outputting a second periodic waveform having a second waveform frequency different from the input waveform frequency; and comparing the second periodic waveform with the first signal to generate a comparison waveform having a comparison waveform duty cycle corresponding to the input waveform duty cycle and a comparison waveform frequency corresponding to the second waveform frequency. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification