HV System Discharge via Residual Current Detection

The patent segments the discharge process into two distinct phases: first discharging only the Cy capacitance (between critical HV potential and ground) to quickly eliminate touch voltage danger, then separately discharging the Cx capacitance (between HV potentials) to restore system operation. This segmentation resolves the contradiction by prioritizing safety through rapid Cy discharge while handling the time-consuming Cx discharge as a separate, non-critical step.

The patent applies partial action by discharging only the necessary portion of the total capacitance (Cy capacitance) required to eliminate the immediate safety hazard, rather than discharging the entire Cx capacitance. This partial discharge achieves the safety goal in milliseconds, while the remaining Cx discharge is performed separately without compromising safety.

The discharge process is segmented into priority-based stages: Cy capacitance discharge is executed first with high priority to quickly reduce touch voltage and minimize energy transfer time, while Cx capacitance discharge is performed subsequently with lower priority. This segmentation achieves acceptable energy loss while dramatically reducing the critical time parameter.

The patent rushes through the critical Cy capacitance discharge phase to quickly eliminate the safety hazard, accepting that not all energy is discharged immediately. The less critical Cx capacitance discharge is then completed in a relaxed timeframe, effectively skipping the time-consuming portion of energy discharge until after safety is secured.