Controller for a phase cut dimmable LED driver

A non-transitory computer program product encoding instructions that when executed by one or more processors cause a dimming control process for a light system to be carried out, the process comprising:

• receiving, at a controller of a lighting driver circuit, a representation of an input voltage waveform having a phase cut angle (φcut) and a waveform zero angle (φzero), as well as a known frequency;
• acquiring, by the controller, data representative of a period of the waveform;
• determining, by the controller, a plurality of Fourier series coefficients associated with the waveform;
• extracting, by the controller, the phase cut angle (φcut) and the waveform zero angle (φzero) based on the coefficients;
• determining, by the controller, a current for one or more light emitting diodes (LEDs) based on at least one of the phase cut angle (φcut) and the waveform zero angle (φzero);
• and
• adjusting, by the controller, a duty cycle of a pulse width modulation (PWM) signal to provide the determined current to the one or more LEDs.

A lighting driver controller, comprising:

• a processor;
• a memory accessible to the processor and encoding a plurality of instructions that when executed by the processor cause a dimming control process to be carried out, the process comprising:
• receiving a representation of an input voltage waveform having a phase cut angle (φcut) and a waveform zero angle (φzero), as well as a known frequency;
• acquiring data representative of a period of the waveform;
• determining a plurality of Fourier series coefficients associated with the waveform;
• extracting the phase cut angle (φcut) and the waveform zero angle (φzero) based on the coefficients;
• determining a current for one or more light emitting diodes (LEDs) based on at least one of the phase cut angle (φcut) and the waveform zero angle (φzero);
• and
• adjusting a duty cycle of a pulse width modulation (PWM) signal to provide the determined current to the one or more LEDs.