Systems and methods for intelligent dimming control using TRIAC dimmers
First Claim
1. An apparatus for a power converter, the apparatus comprising:
- a drive signal generator 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 winding of a power converter;
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 under one or more conditions;
wherein the drive signal generator is further configured to;
in response to the first pulse width being smaller than a 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
11 Claims
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1. An apparatus for a power converter, the apparatus comprising:
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a drive signal generator 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 winding of a power converter; 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 under one or more conditions; wherein the drive signal generator is further configured to; in response to the first pulse width being smaller than a 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)
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11. A method for a power converter, 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 under one or more conditions; processing the input signal; and outputting a drive signal to a switch to affect a current that flows through a winding of a power converter; wherein the processing the input signal includes processing the first pulse width and a second threshold; and wherein the outputting a drive signal to a switch to affect a current that flows through a winding of a power converter includes, in response to the first pulse width being smaller than a 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