Maximum power output circuit for an EHC and design method thereof

• US 9,899,876 B2
• Filed: 04/17/2015
• Issued: 02/20/2018
• Est. Priority Date: 03/13/2015
• Status: Active Grant

• Current Assignee: Shanghai JIAO TONG University
• Original Assignee: Shanghai JIAO TONG University
• Inventors: Liu, Yadong, Hu, Chenlin, Xie, Xiaolei, Sheng, Gehao, Jiang, Xiuchen
• Primary Examiner(s): Houston, Adam
• Application Number:
  US14/689,843
• Publication Number:
  US 20160268812A1
• Time in Patent Office: 1,040 Days
• Field of Search: 307 91, 307104
• CPC Class Codes: H02J 11/00 Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted
• CPC Class Codes: H02J 50/001 Energy harvesting or scavenging
• CPC Class Codes: H02J 50/10 using inductive coupling

Abstract

A maximum power output circuit for EHC and its design method are presented. The circuit is comprised of a magnetic core, that is, a primary coil and a secondary coil, with a load resistor and a capacitor parallel connected at the two ends of the secondary coil. The circuit enables the EHC to be always working at the maximum power output, thus realizing maximum power output of the energy harvesting power source.

Claims

1. A maximum power output circuit for an energy harvesting coil, comprising

a primary coil, the primary coil being a magnetic core having an outer parameter D₀, an inner diameter D_i, a width h, a density w, a weight W, an effective permeability μ

, a maximum power output P_max, and a fixed volume V,

a secondary coil, the secondary coil being wound around the primary coil with N₂ number of turns,

a load resistor having a resistance R, and

a capacitor having a capacitance C,

wherein the load resistor and the capacitor are separately parallel connected to two ends of the secondary coil;

the magnetic core has the fixed volume V being

2. A method for designing the maximum power output circuit for the energy harvesting coil of claim 1, comprising

setting a power density index λ

under a minimum working current;

calculating the magnetization current I_μ

, under the minimum working current according to a maximum output power of the energy harvesting coil as follows;