Maximum power point tracking device for energy harvesting system

Abstract

The invention discloses a maximum power point tracking device for an energy harvesting system. The maximum power point tracking device comprises an energy collection device, an inductor, a PMOS transistor MP, an NMOS transistor MN, a load capacitor C, a pulse generation circuit, a switch control unit, a time delay unit, a logic gate, a driving stage, a comparator, a Voc sampling module and an MPPoutput module. According to the device, the switch control and current conversion technology is adopted, and the effective maximum power sampling and tracking time is reduced. The fast boost converterbased on the current holding technology is adopted, large input capacitance can be avoided, and the energy loss in the sampling process can be reduced while the area is reduced. Compared with a traditional maximum power point tracking device, the maximum power point tracking device is simple in structure, the tracking time can be remarkably shortened, and the power conversion efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design and manufacture, and relates to a maximum power point tracking device for an energy harvesting system. Background technique [0002] Maximum power point tracking devices (MPPT) are generally used in energy harvesting systems, often used in power management units. The function of maximum power point tracking is to identify the maximum available power from the front-end energy harvesting device in the energy harvesting system, which is used to extend the service life of the device. Common maximum power point tracking methods include P&O and FOCV. Among them, the FOCV method is often used in low-power applications. The main principle is to find the maximum power point through the linear relationship between the open circuit voltage, the output voltage Voc, and the MPP voltage. [0003] In traditional energy harvesting applications, the discontinuous conduction mode requires the po...

AI Technical Summary

Problems solved by technology

However, the large input capacitance of the MPPT input limits the fast sampling and calculation of Voc; in the continuous conduction mode, although the input capacitance is small, the maximum power point current in the inductor is large, and this current needs to be quickly drained during the sampling process. The current size of the discharge is proportional to the output power of the system, so it is difficult to achieve effective fast sampling and tracking

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