Method and device for obtaining conduction angle, method and device for driving LED
AssigneeOsram Gesellschaft Mit Beschraenkter Haftung
InventorsLuca Bordin, Yuli Chen, Shijun Nie, Wei Tan
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Abstract
In various embodiments, a method for obtaining a conduction angle of a trailing edge dimmer is provided. The method may include determining a time point t0 when the trailing edge dimmer starts to be conductive; determining an earliest time point t1 when a deviation from an ideal waveform appears; and determining the conduction angle t1-t0 of the trailing edge dimmer based on the earliest time point t1 when the deviation from the ideal waveform appears and the time point t0 when the trailing edge dimmer starts to be conductive.
Claims12
A method for obtaining a conduction angle of a trailing edge dimmer, the method comprising:
- determining a time point t0 when the trailing edge dimmer starts to be conductive;
- determining an earliest time point t1 when a deviation from an ideal waveform appears;
- and
- determining the conduction angle t1-t0 of the trailing edge dimmer based on the earliest time point t1 when the deviation from the ideal waveform appears and the time point t0 when the trailing edge dimmer starts to be conductive.
An LED driving method, comprising:
- determining a type of a dimmer;
- obtaining a conduction angle of a leading edge dimmer, when it is determined that the dimmer connected is the leading edge dimmer;
- obtaining a conduction angle of a trailing edge dimmer with a method for obtaining a conduction angle of a trailing edge dimmer, when it is determined that the dimmer connected is the trailing edge dimmer, the method comprising:
- determining a time point t0 when the trailing edge dimmer starts to be conductive;
- determining an earliest time point t1 when a deviation from an ideal waveform appears;
- and
- determining the conduction angle t1-t0 of the trailing edge dimmer based on the earliest time point t1 when the deviation from the ideal waveform appears and the time point t0 when the trailing edge dimmer starts to be conductive;
- and
- generating a dimming signal according to the obtained conduction angle of the dimmer.
A conduction angle obtaining device for a trailing edge dimmer, the device comprising:
- a conducting time point determiner, which is configured to determine a time point t0 when the trailing edge dimmer starts to be conductive;
- a phase cutting point determiner, which is configured to determine an earliest time point t1 when a deviation from an ideal waveform appears;
- and
- a conduction angle determiner, which is configured to determine the conduction angle t1-t0 of the trailing edge dimmer based on the earliest time point t1 when the deviation from the ideal waveform appears and the time point t0 when the trailing edge dimmer starts to be conductive.
An LED driving device, comprising:
- a dimmer type determiner, which is configured to determine a type of a dimmer;
- a conduction angle obtaining device for a leading edge dimmer, which is configured to obtain a conduction angle of a leading edge dimmer, when it is determined that the dimmer connected is the leading edge dimmer;
- a conduction angle obtaining device for a trailing edge dimmer, which is configured to obtain a conduction angle of a trailing edge dimmer, when it is determined that the dimmer connected is the trailing edge dimmer, the conduction angle obtaining device comprising:
- a conducting time point determiner, which is configured to determine a time point t0 when the trailing edge dimmer starts to be conductive;
- a phase cutting point determiner, which is configured to determine an earliest time point t1 when a deviation from an ideal waveform appears;
- a conduction angle determiner, which is configured to determine the conduction angle t1-t0 of the trailing edge dimmer based on the earliest time point t1 when the deviation from the ideal waveform appears and the time point t0 when the trailing edge dimmer starts to be conductive;
- and
- a dimming circuit, which is configured to generate a dimming signal according to the obtained conduction angle of the dimmer.
Dependencies are inferred from the claim text.