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US 12,604,377 B2Granted
Light driver with improved dimming profile
AssigneeErp Power, LLC
InventorsMichael Archer, Louis Chen, James H. Mohan
Life of this patent
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Abstract
A light driver includes a pulse generator circuit configured to generate a pulsed signal based on a rectified input line voltage, a dimming detection circuit configured to determine whether phase-cut dimming is present at an input of the light driver based on the pulsed signal and to generate a phase-cut detection signal, and an input selection circuit configured to apply a first voltage or a second voltage to a reference input of a power factor correction (PFC) circuit of the light driver based on the phase-cut detection signal.
Claims18
A light driver comprising:
- a power factor correction (PFC) circuit having a reference input and configured to receive a PFC input voltage;
- a second voltage divider configured to generate a first voltage based on a rectified input line voltage;
- a third voltage divider configured to generate a second voltage based on the PFC input voltage;
- a dimming detection circuit configured to determine whether phase-cut dimming is present at an input of the light driver based on an input line voltage of the light driver and to generate a phase-cut detection signal;
- and
- an input selection circuit comprising a switching circuit configured to receive the first voltage and the second voltage, and to selectively apply one of the first voltage and the second voltage to the reference input of the PFC circuit based on the phase-cut detection signal.
3 more elements
Dependencies are inferred from the claim text.