Thermopile Temperature Detection Circuit Digital Correction

The patent replaces the mechanical/analog circuit adjustment system with a digital processing system. The A/D converter converts analog signals to digital values, and a processor then performs digital calculations using stored coefficients to determine temperature. This substitution enables higher precision temperature detection across wide temperature ranges while maintaining manageable device complexity through software-based correction algorithms.

The patent changes the operating parameters from pure analog gain adjustment to digital value processing with multiple correction coefficients. By storing first coefficients for converting detection voltages to temperatures and second coefficients for correcting detection errors, the system achieves accurate temperature measurement across extended ranges. The processor dynamically applies these parameter changes based on detected temperature ranges.

The patent performs preliminary actions by pre-storing multiple sets of correction coefficients in memory before actual temperature detection occurs. These coefficients are prepared in advance for different temperature ranges and thermopile characteristics. During operation, the processor simply retrieves and applies the appropriate pre-prepared coefficients, enabling rapid adaptation to different thermopile properties without complex real-time calculations.

The patent implements feedback mechanisms where the processor continuously monitors detection values and adjusts temperature calculations by applying appropriate correction coefficients. The system uses feedback from the detection circuit to select which set of coefficients to apply, and continuously refines temperature measurements by comparing detected values against stored reference data, thereby adapting to different thermopile properties.