Gate Driver IC Disconnection Detection via Dual Diode Threshold Comparison

The feedback signal determination is segmented into multiple independent comparison operations. Instead of using a single threshold value, the invention compares the feedback signal against multiple threshold values (first threshold and second threshold) to determine different states (first level, second level, third level). This segmentation allows the system to detect disconnection abnormalities that would be indistinguishable with a single threshold.

The invention changes the parameter of threshold values from a single fixed value to multiple variable thresholds. By introducing first and second thresholds with different values, the system can distinguish between normal signal variations and actual disconnection abnormalities. The comparison unit dynamically evaluates the feedback signal against these multiple threshold parameters to achieve reliable abnormality detection.

The comparison unit is designed to perform multiple functions: it compares the feedback signal against multiple thresholds, determines multiple signal levels, and detects various abnormality types (power supply disconnection, ground line disconnection, signal line disconnection). This multi-functional design achieves reliable abnormality detection without proportionally increasing circuit complexity, as the same hardware structure handles multiple detection tasks.

The drive circuit uses its own feedback signal for self-diagnosis and abnormality detection. The feedback signal, which normally serves to convey drive circuit status to the timing controller, is also utilized by the comparison unit to detect disconnection abnormalities. This self-service approach enables the system to monitor its own health without requiring additional external monitoring hardware.