Systems and methods for intelligent dimming control using TIRAC dimmers
First Claim
1. An apparatus for a power conversion system, the apparatus comprising:
- a process-and-drive component configured to receive an input signal associated with a TRIAC dimmer and output a drive signal to a switch to affect a current that flows through a primary winding of a power conversion system;
wherein;
the input signal includes a first pulse corresponding to a first input period, the first pulse being associated with a first pulse width; and
the first pulse width is larger than a first threshold for normal operation of the TRIAC dimmer;
wherein the process-and-drive component is further configured to;
process information associated with the first pulse width and a second threshold, the second threshold being larger than the first threshold; and
in response to the first pulse width being smaller than the second threshold, even if the first pulse width is still larger than the first threshold, maintain the drive signal at a first logic level without modulation to keep the switch open during at least the first input period.
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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
12 Claims
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1. An apparatus for a power conversion system, the apparatus comprising:
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a process-and-drive component configured to receive an input signal associated with a TRIAC dimmer and output a drive signal to a switch to affect a current that flows through a primary winding of a power conversion system; wherein; the input signal includes a first pulse corresponding to a first input period, the first pulse being associated with a first pulse width; and the first pulse width is larger than a first threshold for normal operation of the TRIAC dimmer; wherein the process-and-drive component is further configured to; process information associated with the first pulse width and a second threshold, the second threshold being larger than the first threshold; and in response to the first pulse width being smaller than the second threshold, even if the first pulse width is still larger than the first threshold, maintain the drive signal at a first logic level without modulation to keep the switch open during at least the first input period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for a power conversion system, the method comprising:
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receiving an input signal associated with a TRIAC dimmer, the input signal including a first pulse corresponding to a first input period, the first pulse being associated with a first pulse width, the first pulse width being larger than a first threshold for normal operation of the TRIAC dimmer; processing information associated with the input signal; and outputting a drive signal to a switch to affect a current that flows through a primary winding of a power conversion system; wherein the processing information associated with the input signal includes processing information associated with the first pulse width and a second threshold, the second threshold being larger than the first threshold; and wherein the outputting a drive signal to a switch to affect a current that flows through a primary winding of a power conversion system includes, in response to the first pulse width being smaller than the second threshold, even if the first pulse width is still larger than the first threshold, maintaining the drive signal at a first logic level without modulation to keep the switch open during at least the first input period.
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Specification