Universal led dimmer with extended application range

A power supply circuitry comprising:

• an internal voltage source;
• a detection circuit configured to detect a type of a dimmer control that is electrically coupled to the power supply circuitry,
• wherein the type is based on whether the detection circuit senses an input voltage provided by the dimmer control, the type being a sink type if voltage is detected and a source type if no voltage is detected;
• a configuration circuit configured to
• turn off the internal voltage source in response to a determination that the dimmer control is of the sink type, which causes the internal voltage source to refrain from generating voltage that would interfere with the input voltage that acts as a dimming control signal, and
• turn on the internal voltage source in response to a determination that the dimmer control is of the source type, which causes the internal voltage source to generate voltage that acts as the dimming control signal;
• wherein a voltage level of the dimming control signal is detected by a microcontroller that generates a series of pulse-width modulation (PWM) signals to drive a load.

A method comprising:

• determining, by a detection circuit, whether an input voltage is provided by a dimmer control;
• in response to a determination that the input voltage is detected,
• establishing, by the detection circuit, that the dimmer control is of a sink type;
• deactivating, by a configuration circuit, an internal voltage source;
• and
• directing, by the configuration circuit, the input voltage to a microprocessor as a dimming control signal;
• and
• in response to a determination that the input voltage is not detected,
• establishing, by the detection circuit, that the dimmer control is of a source type;
• activating, by the configuration circuit, the internal voltage source;
• and
• directing, by the configuration circuit, voltage generated by the internal voltage source to the microprocessor as the dimming control signal.