Solid-State Lighting With An Adapted Control Voltage

A light-emitting diode (LED) luminaire, comprising:

• one or more LED arrays;
• a full-wave rectifier configured to convert a line voltage from alternate-current (AC) mains into a first direct-current (DC) voltage;
• an input filter configured to suppress an electromagnetic interference (EMI) noise;
• a power switching driver comprising a transformer having a primary side and a secondary side, which is separated from the primary side, and a power factor correction (PFC) and control circuit, the power switching driver coupled to the full-wave rectifier, via the input filter, and configured to convert the first DC voltage into a second DC voltage with an output current driving the one or more LED arrays;
• and
• a detection and control circuit comprising a voltage sensing circuit, a current sensing circuit, a voltage regulator circuit, an optocoupler circuit, and a pair of low-voltage input/output ports receiving an external voltage, the detection and control circuit configured to extract an electrical signal from the second DC voltage, the output current driving the one or more LED arrays, and the external voltage and to couple an optical feedback signal to the power switching driver;
• wherein:
• the optocoupler circuit comprises an LED and a first photo-detector;
• the LED is configured to receive the electrical signal from both the voltage sensing circuit and the current sensing circuit and to illuminate the first photo-detector;
• the first photo-detector is configured to receive the optical feedback signal and to control the power switching driver;
• a combination of the LED and the first photo-detector is configured to prevent the detection and control circuit from electrically affecting an operation in the primary side of the transformer;
• and
• the power switching driver is further configured to dynamically adjust the output current driving the one or more LED arrays in response to the optical feedback signal.