Systems and methods for intelligent dimming control using TRIAC dimmers
First Claim
1. A system for a power converter, the system comprising:
- a first signal generator configured to receive an input signal and output a drive signal to a switch to affect a current that flows through a winding of a power converter;
wherein;
the drive signal is associated with a first modulation period for a first input period and a second modulation period for a second input period;
wherein the first signal generator is further configured to;
determine the first modulation period for the first input period;
change the drive signal between a first logic level and a second logic level at a modulation frequency during the first modulation period;
determine the second modulation period for the second input period; and
change the drive signal between the first logic level and the second logic level at the modulation frequency during the second modulation period;
wherein;
a first pulse corresponds to a first pulse width;
a second pulse corresponds to a second pulse width;
the first modulation period corresponds to a first duration; and
the second modulation period corresponds to a second duration.
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Abstract
Systems and methods for dimming control using TRIAC dimmers are provided. An example apparatus for a power conversion system includes: a process-and-drive component configured to receive an input signal and output a drive signal to a switch to affect a current that flows through a primary winding of a power conversion system. The input signal includes a first pulse associated with a first input period and a second pulse associated with a second input period. The drive signal is associated with a first modulation period for the first input period and a second modulation period for the second input period. The process-and-drive component is further configured to: determine the first modulation period for the first input period; change the drive signal between a first logic level and a second logic level at a modulation frequency during the first modulation period; determine the second modulation period for the second input period.
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Citations
23 Claims
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1. A system for a power converter, the system comprising:
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a first signal generator configured to receive an input signal and output a drive signal to a switch to affect a current that flows through a winding of a power converter; wherein; the drive signal is associated with a first modulation period for a first input period and a second modulation period for a second input period; wherein the first signal generator is further configured to; determine the first modulation period for the first input period; change the drive signal between a first logic level and a second logic level at a modulation frequency during the first modulation period; determine the second modulation period for the second input period; and change the drive signal between the first logic level and the second logic level at the modulation frequency during the second modulation period; wherein; a first pulse corresponds to a first pulse width; a second pulse corresponds to a second pulse width; the first modulation period corresponds to a first duration; and the second modulation period corresponds to a second duration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for a power converter, the system comprising:
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a first signal generator configured to receive an input signal and output a drive signal to a switch to affect a current that flows through a winding of a power converter; wherein; the drive signal is associated with one or more modulation periods and a first modulation period, the one or more modulation periods corresponding to one or more input periods respectively, the first modulation period corresponding to a first input period; and one or more input pulses are associated with one or more pulse widths respectively; wherein the first signal generator is further configured to; select a first smallest pulse width from the one or more pulse widths; determine a first duration of the first modulation period based at least in part on the first smallest pulse width; and change the drive signal between a first logic level and a second logic level at a modulation frequency during the first modulation period. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for a power converter, the method comprising:
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receiving an input signal; and outputting a drive signal to a switch to affect a current that flows through a winding of a power converter, the drive signal being associated with a first modulation period for a first input period and a second modulation period for a second input period; wherein the outputting a drive signal to a switch to affect a current that flows through a winding of a power converter includes; determining the first modulation period for the first input period; determining the second modulation period for the second input period; changing the drive signal between a first logic level and a second logic level at a modulation frequency during the first modulation period; and changing the drive signal between the first logic level and the second logic level at the modulation frequency during the second modulation period; wherein; a first pulse corresponds to a first pulse width; a second pulse corresponds to a second pulse width; the first modulation period corresponds to a first duration; and the second modulation period corresponds to a second duration.
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23. A method for a power converter, the method comprising:
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receiving an input signal; and outputting a drive signal to a switch to affect a current that flows through a winding of a power converter, the drive signal being associated with one or more modulation periods and a first modulation period; wherein; the one or more modulation periods correspond to one or more input periods respectively; the first modulation period corresponds to a first input period; and one or more input pulses are associated with one or more pulse widths respectively; wherein the outputting a drive signal to a switch to affect a current that flows through a winding of a power converter includes; selecting a smallest pulse width from the one or more pulse widths; determining a duration of the first modulation period based at least in part on the smallest pulse width; and changing the drive signal between a first logic level and a second logic level at a modulation frequency during the first modulation period.
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Specification