Method and system for layout optimization of secondary coil for wireless power transfer

• US 10,325,718 B2
• Filed: 02/12/2016
• Issued: 06/18/2019
• Est. Priority Date: 06/29/2015
• Status: Active Grant

• Current Assignee: Korea Advanced Institute of Science and Technology
• Original Assignee: Korea Advanced Institute of Science and Technology
• Inventors: Jang, In Gwun, Lee, Seung Beop
• Primary Examiner(s): Thangavelu, Kandasamy
• Application Number:
  US15/043,131
• Publication Number:
  US 20160379753A1
• Time in Patent Office: 1,222 Days
• CPC Class Codes: G06F 30/36 Circuit design at the analogue level
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/12 of the resonant type

Abstract

Disclosed is a method for optimizing a layout of a secondary coil for a wireless power transfer. The method includes reconstructing a secondary coil based on a fixed grid, corresponding to a design domain, to set a relative turn of each fixed grid and obtaining at least one or more of an electromagnetic measure and a physical measure of the secondary coil to optimize a layout of the secondary coil; applying an effective turn to the optimized layout of the secondary coil to perform post-processing; and deriving a layout of a physical coil about the secondary coil. The effective turn corresponds to a difference between the relative turns existing at a same position.

Claims

1. A method for optimizing a layout of a secondary coil for a wireless power transfer, the method comprising:

reconstructing, by one or more processors, a secondary coil based on a fixed grid, corresponding to a design domain, to set a relative turn of each fixed grid and obtaining at least one or more of an electromagnetic measure and a physical measure of the secondary coil to optimize a layout of the secondary coil;

applying, by the one or more processors, an effective turn to the optimized layout of the secondary coil to perform post-processing;

deriving, by the one or more processors, a layout of a physical coil about the secondary coil; and

developing the secondary coil according to the derived layout,

wherein the electromagnetic measure comprises at least one or more of a transfer efficiency, a transfer capacity, an induced voltage, and an electromagnetic field, and the physical measure comprises at least one or more of a mass, a volume, and a size of the secondary coil, and

wherein the effective turn corresponds to one-half a sum of differences between the relative turns at a given position.

2. The method of claim 1, further comprising:

obtaining an objective function for minimizing or maximizing at least one or more of the electromagnetic measure and the physical measure of the secondary coil.

3. The method of claim 1, further comprising:

obtaining a constraint including at least one or more of an upper limit and a lower limit of the electromagnetic and physical measures of the secondary coil.

4. The method of claim 1, wherein the optimizing of the layout of the secondary coil comprises:

form the fixed grid corresponding to the design domain;

obtaining physical coil turns by reconstructing the secondary coil based on the fixed grids and setting the relative turn of each fixed grid; and

obtaining the electromagnetic measure and the physical measure of the secondary coil to optimize the layout of the secondary coil.

5. The method of claim 1, wherein the optimizing of the layout of the secondary coil comprises:

optimizing the layout of the secondary coil by calculating the physical measure of secondary coil through the effective turn and calculating the electromagnetic measure of the secondary coil through Maxwell equations.

6. The method of claim 1, wherein the applying of the effective turn to the optimized layout of the secondary coil to perform the post-processing comprises:

applying the effective turn to the optimized layout of the secondary coil to calculate the physical measure of the secondary coil; and

applying the effective turn to the optimized layout of the secondary coil to evaluate the electromagnetic measure of the secondary coil.

7. The method of claim 1, wherein the applying of the effective turn to the optimized layout of the secondary coil to perform the post-processing comprises:

calculating smooth boundary representation to minimize a difference between fixed grid-based coil representation and physical coil implementation.

8. The method of claim 1, wherein the deriving comprises:

post-processing the secondary coil composed of the fixed grid so as to have a coil having a smooth boundary; and

calculating a physical characteristic value and an electromagnetic characteristic value of the secondary coil expressed with the smooth boundary.

9. A system for optimizing a layout of a secondary coil for a wireless power transfer, the system comprising:

one or more processors; and

a non-transitory computer-readable memory coupled to the one or more processors and storing instructions thereon executable by the one or more processors, the instructions including;

an optimization module reconstructing a secondary coil based on a fixed grid, corresponding to a design domain, to set a relative turn of each fixed grid and obtaining at least one or more of an electromagnetic measure and a physical measure of the secondary coil to optimize a layout of the secondary coil; and

an analysis module applying an effective turn, corresponding to one-half a sum of differences between relative turns at a given position, to the optimized layout of the secondary coil to perform post-processing,

wherein the electromagnetic measure comprises at least one or more of a transfer efficiency, a transfer capacity, an induced voltage, and an electromagnetic field, and the physical measure comprises at least one or more of a mass, a volume, and a size of the secondary coil,

wherein the optimization module derives a layout of a physical layout about the secondary coil by analyzing at least one or more of the electromagnetic measure and the physical measure of the secondary coil based on a result of the post-processing received from the analysis module, and

wherein the secondary coil is developed according to the derived layout.

10. The system of claim 9, wherein the optimization module comprises:

an object function setting unit obtaining an objective function for minimizing or maximizing at least one or more of the electromagnetic measure and the physical measure of the secondary coil.

11. The system of claim 9, wherein the optimization module comprises:

a constraint setting unit obtaining a constraint including at least one or more of an upper limit and a lower limit of the electromagnetic and physical measures of the secondary coil.

12. The system of claim 9, wherein the optimization module comprises:

a fixed grid generation unit forming the fixed grid corresponding to the design domain;

a relative turn setting unit obtaining physical coil turns by reconstructing the secondary coil based on the fixed grids and setting the relative turn of each fixed grid; and

a layout unit obtaining the electromagnetic measure and the physical measure of the secondary coil to optimize the layout of the secondary coil.

13. The system of claim 9, wherein the optimization module optimizes the layout of the secondary coil by calculating the physical measure of secondary coil through the effective turn and calculating the electromagnetic measure of the secondary coil through Maxwell equations.

14. The system of claim 9, wherein the analysis module comprises:

a physical measure evaluation unit applying the effective turn to the optimized layout of the secondary coil to calculate the physical measure of the secondary coil; and

an electromagnetic measure evaluation unit applying the effective turn to the optimized layout of the secondary coil to evaluate the electromagnetic measure of the secondary coil.

15. The system of claim 14, wherein the electromagnetic measure evaluation unit represents an equivalent closed loop based on the post-processing to calculate the electromagnetic measure.