System and method for measuring load of vehicle using optimal resonant frequency search wireless power transmission system
AssigneeBanf Co., Ltd.
InventorsYoung Sun KIM, Sung Han YOU, Ji Young SONG
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Abstract
The present invention provides a system and method for measuring the load of a vehicle using an optimal resonant frequency search wireless power transmission system, wherein a wireless power transmission system, which has maximum power transmission efficiency due to effectively searching for an optimal resonant frequency by varying system frequency, is provided in order to supply wireless power to various sensors mounted on wheels and wheel housings, etc. of the vehicle, and the load can be accurately and effectively measured by using the wireless power transmission system without additional sensors or devices.
Claims14
A method of measuring a load of a vehicle using an optimal resonant frequency search wireless power transmission system, in a method of measuring a load using a magnetic resonant wireless power transmission system that is installed in a vehicle having a vehicle height that varies according to the load of the vehicle including a loaded cargo, and is provided with a power transmission unit (Tx) and a power reception unit (Rx),
- the method comprising:
- (a) searching for an optimal resonant frequency according to a change in a power transmission distance using a system frequency variation according to a change in the load of the vehicle;
- (b) deriving an optimal resonant frequency variation relationship according to the change in the power transmission distance;
- and
- (c) calculating an amount of change in power transmission distance from the variation relationship, and deriving the load from the amount of change in power transmission distance.
A system for measuring a load of a vehicle using an optimal resonant frequency search wireless power transmission system, in a system for measuring a load using a magnetic resonant wireless power transmission system that is provided with a power transmission unit (Tx) and a power reception unit (Rx) installed in a vehicle having a vehicle height that varies according to the load of the vehicle including a loaded cargo,
- wherein the system includes the power transmission unit (Tx) provided with an AC/DC conversion circuit, a DC/RF conversion circuit, a matching circuit, a control circuit, and a communication circuit, and the power reception unit (Rx), which is mounted inside a tire and includes a matching circuit, a rectification circuit, a stabilization circuit, a DC/DC conversion circuit, a control circuit, and a communication circuit to receive power from the power transmission unit (Tx),
- the system comprising:
- an optimal resonant frequency search wireless power transmission system configured to search for and determine an optimal resonant frequency by varying a system frequency;
- and
- a load measurement unit configured to derive an optimal frequency variation relationship according to a change in power transmission distance caused by a load change of the vehicle using a frequency variation at a time of the load change, and to measure the load from an amount of change in power transmission distance calculated from the variation relationship.
Dependencies are inferred from the claim text.