Light-Emitting Device Driving Circuit for Low-Power Deep-Skin PPG

The patent implements dynamic current adjustment by dividing the light-emitting device into multiple groups that can be independently controlled. Different groups emit light at different current levels according to predetermined sequences, enabling the system to adaptively adjust driving current based on detection needs rather than maintaining a fixed high current level throughout operation.

The patent employs periodic action through predetermined current sequences where different light-emitting device groups are activated in alternating periods. This allows the system to cycle between different current levels for different groups, achieving deep skin detection capability when needed while reducing overall power consumption during non-critical periods.

The patent applies local quality by assigning different current levels to different groups of light-emitting devices based on their specific operational requirements. Instead of uniformly supplying maximum current to all devices, the system selectively applies appropriate current levels to each group, ensuring that only the necessary portion of the system operates at maximum power while other portions operate at lower, more efficient levels.

The patent implements parameter changes by dynamically adjusting the driving current parameters for different light-emitting device groups according to predetermined sequences. This allows the system to change operational parameters (current levels) based on detection requirements, achieving both reliability in extreme scenarios and improved power supply efficiency through optimized parameter selection.