LED lighting systems and methods for constant current control in various operation modes
First Claim
1. A system for providing at least an output current to one or more light emitting diodes, the system comprising:
- a signal-amplification and voltage-to-current-conversion component configured to receive at least a sensed signal and generate a first current signal, the sensed signal being associated with an inductor current flowing through an inductor coupled to a first switch;
a current-signal generator configured to generate a second current signal;
a capacitor coupled to the current-signal generator, and coupled through a second switch to the signal-amplification and voltage-to-current-conversion component, the capacitor being configured to generate a voltage signal;
a comparator configured to process information associated with the voltage signal and the sensed signal and generate a comparison signal based on at least information associated with the voltage signal and the sensed signal;
a modulation-signal generator configured to receive at least the comparison signal and generate a modulation signal; and
a gate driver configured to receive the modulation signal and output a drive signal to the first switch;
wherein;
the drive signal is associated with at least one or more switching periods, each of the one or more switching periods including at least an on-time period for the first switch; and
the first current signal represents the inductor current;
wherein for each of the one or more switching periods,the first current signal is configured to discharge or charge the capacitor during only the on-time period; and
the second current signal is configured to charge or discharge the capacitor during only the on-time period.
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Accused Products
Abstract
System and method for providing at least an output current to one or more light emitting diodes. The system includes a control component configured to receive at least a demagnetization signal, a sensed signal and a reference signal and to generate a control signal based on at least information associated with the demagnetization signal, the sensed signal and the reference signal, and a logic and driving component configured to receive at least the control signal and output a drive signal to a switch based on at least information associated with the control signal. The switch is connected to a first diode terminal of a diode and a first inductor terminal of an inductor. The diode further includes a second diode terminal, and the inductor further includes a second inductor terminal.
92 Citations
5 Claims
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1. A system for providing at least an output current to one or more light emitting diodes, the system comprising:
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a signal-amplification and voltage-to-current-conversion component configured to receive at least a sensed signal and generate a first current signal, the sensed signal being associated with an inductor current flowing through an inductor coupled to a first switch; a current-signal generator configured to generate a second current signal; a capacitor coupled to the current-signal generator, and coupled through a second switch to the signal-amplification and voltage-to-current-conversion component, the capacitor being configured to generate a voltage signal; a comparator configured to process information associated with the voltage signal and the sensed signal and generate a comparison signal based on at least information associated with the voltage signal and the sensed signal; a modulation-signal generator configured to receive at least the comparison signal and generate a modulation signal; and a gate driver configured to receive the modulation signal and output a drive signal to the first switch; wherein; the drive signal is associated with at least one or more switching periods, each of the one or more switching periods including at least an on-time period for the first switch; and the first current signal represents the inductor current; wherein for each of the one or more switching periods, the first current signal is configured to discharge or charge the capacitor during only the on-time period; and the second current signal is configured to charge or discharge the capacitor during only the on-time period. - View Dependent Claims (2, 3, 4)
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5. A method for providing at least an output current to one or more light emitting diodes, the method comprising:
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receiving at least a sensed signal, the sensed signal being associated with an inductor current flowing through an inductor coupled to a switch; processing information associated with the sensed signal; generating a first current signal based on at least the information associated with the sensed signal; generating a second current signal; processing information associated with the first current signal and the second current signal; generating a voltage signal, by at least a capacitor, based on at least the information associated with the first current signal and the second current signal; processing information associated with the voltage signal and the sensed signal; generating a comparison signal based on at least the information associated with the voltage signal and the sensed signal; receiving at least the comparison signal; generating a modulation signal based on at least information associated with the comparison signal; receiving the modulation signal; and outputting a drive signal based on at least information associated with the modulation signal; wherein; the drive signal is associated with at least one or more switching periods, each of the one or more switching periods including at least an on-time period; and the first current signal represents the inductor current; wherein for each of the one or more switching periods, the process for processing information associated with the first current signal and the second current signal includes; discharging or charging the capacitor with the first current signal during only the on-time period; and charging or discharging the capacitor with the second current signal during only the on-time period.
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Specification