Maximum power point tracking device for energy harvesting system

A technology of maximum power point and energy harvesting, applied in control/regulation systems, regulating electrical variables, instruments, etc., can solve problems such as difficult fast sampling and tracking, limit Voc fast sampling and calculation, etc., to improve power conversion efficiency, The effect of simple structure and reduced area

CN112051884AActive Publication Date: 2020-12-08NINGBO UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-12-08

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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.
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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...

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Embodiment Construction

[0022] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but it is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered by the present invention. within the scope of protection.

[0023] The present invention provides a maximum power point tracking device for an energy harvesting system, such as figure 1 As shown, the maximum power point tracking device includes an energy harvesting device, an inductor, a PMOS transistor MP, an NMOS transistor MN, a load capacitor C, a pulse generating circuit, a switch control unit, a delay unit, a logic gate, a driver stage, a comparator, Voc sampling and MPP output module, where:

[0024] The output end of the energy harvesting device is respectively connected to the input end of the inductor...