Energy storage inductor zero crossing

How can a zero-crossing point model be used to predict inductor current?

By establishing a model for predicting the zero-crossing points of the inductor current, the current at the beginning and end of each stage can be accurately estimated. In comparison to traditional methods, the proposed approach eliminates the need for ZCD auxiliary circuits and current sensors.

Does GaN transistor-based Totem Pole power factor correction have a discontinuous conduction mode?

Abstract: A digital control scheme for GaN transistor-based totem pole power factor correction (PFC) is proposed in this paper. At the zero crossing, the totem pole PFC has a discontinuous conduction mode (DCM) current section because of its driving method and circuit structure.

How does a zero-crossing converter work?

The zero-crossing prediction is achieved solely by sampling the input and output voltages, resulting in a simplified hardware circuit design. Furthermore, the extended conduction time of the SR enables the realization of full-range ZVS, enhancing the converter’s flexibility in complex operating conditions.

What is inductor current observer?

In , an inductor current observer is employed to replace the current sensor, allowing estimation of the current based on input and output voltages. The optimal switching frequency can be calculated using this approach. However, the dead time optimization is not addressed.

Why do synchronous rectifiers reduce inductor current?

The inductor current is not reduced to less than zero because turning off the synchronous switch causes the current to pass through the body diode. This control technology can improve efficiency by stably operating the synchronous rectifiers even for only a brief period before the DCM level is reached.

How to calculate inductor current IL?

In the converter, the inductor current iL can be estimated by observing the linear charging or discharging behavior of the inductor when switches Q1 or Q2 are turned on. During the two dead time, resonates with L. This resonance allows Coss for the estimation of the inductor current from an energy perspective.