Synchronous Boost Regulator Active Negative Current Modulation

The patent introduces an active negative current modulation circuit as an intermediary mechanism that detects negative inductor current and actively counteracts it by controlling the high-side switch. This active control approach replaces the passive RC snubber, achieving oscillation suppression without the continuous energy dissipation inherent in passive damping components.

The patent replaces the passive mechanical/electrical damping system (RC snubber) with an active electronic control system that uses sensing and feedback mechanisms. The active negative current modulation circuit monitors inductor current and dynamically adjusts switch operation, substituting the static passive damping approach with a dynamic active control approach that maintains power efficiency.

The patent employs feedback mechanisms where the negative current detection circuit continuously monitors the inductor current and provides feedback to the control circuit. When reverse current is detected, the system adjusts the high-side switch conduction time to prevent excessive voltage stress, maintaining voltage regulation while protecting the low-side transistor.

The patent implements dynamic control of the high-side switch conduction time based on real-time inductor current conditions. Under light load conditions where reverse current occurs, the system dynamically adjusts the switch timing to limit negative current, thereby reducing voltage stress on the low-side transistor while maintaining adequate voltage regulation.