EV Charger DAB Control for Power Pulsation Absorption

The power pulsation absorption function is segmented from the traditional single large capacitor into multiple smaller capacitors arranged in a specific circuit configuration. The patent uses multiple capacitors (including first, second, third, and fourth capacitors) that work together to absorb power pulsation, distributing the energy storage function across multiple smaller components rather than relying on one large capacitor.

The patent introduces active switching elements (switches with controlled gating) that dynamically adjust the circuit configuration based on the power pulsation conditions. The switching elements enable the capacitor network to adaptively respond to power pulsation in real-time, optimizing the absorption efficiency while maintaining compact dimensions through dynamic control rather than static oversized components.

The patent applies preliminary action by pre-charging or pre-discharging specific capacitors before the main switching event occurs. The switching elements are controlled to prepare the voltage conditions in advance, ensuring that when the actual switching happens, the voltage difference is minimized, thereby avoiding hard switching and reducing energy loss while maintaining fast switching speeds.

The patent introduces intermediary capacitor elements that act as buffers between the switching elements and the main power circuit. These intermediary capacitors absorb voltage spikes and provide smooth transition during switching events, mediating the energy transfer to prevent hard switching while enabling rapid switching operation.