US 12,003,114 B2Granted

Series/series resonant topology for wireless power transfer

AssigneeVirginia Tech Intellectual Properties, Inc.

InventorsKeyao Sun, Jun Wang, Rolando Burgos, Dushan Boroyevich

Life of this patent

Estimating the term…

Loading patent…

Abstract

Aspects of an efficient compensation network for reducing reactive power in a wireless power transfer (WPT) system are disclosed. The compensation network comprises a series/series (S/S) constant current (CC) source, a reactive power compensation capacitor, and a constant current (CC)-to-constant voltage (CV) network. In an example, the S/S CC source comprises a first capacitor connected in series with a first inductor on a primary side of a transformer and a second inductor on a secondary side of the transformer. The S/S CC source converts an input voltage signal of the WPT system into a constant alternating current (AC) current signal. In an example, the CC-to-CV network comprises at least a third capacitor and a third inductor. The CC-to-CV network converts the constant AC current signal into a constant AC voltage signal.

Claims20

Dependent claims

A wireless power transfer (WPT) system comprising:

a compensation network for reducing reactive power in the WPT system, the compensation network comprising:
a series/series (S/S) constant current (CC) source comprising a transformer and a S/S compensation network for the transformer, the S/S compensation network consisting of a first compensation capacitor and a second compensation capacitor, the first compensation capacitor being connected in series with a first inductor on a primary side of the transformer and the second compensation capacitor being connected in series with a second inductor on a secondary side of the transformer, the first compensation capacitor, the first inductor and a mutual inductance of the transformer configured for resonant operation at a defined frequency, the S/S CC source converting an input voltage signal of the WPT system into a constant alternating current (AC) current signal at the defined frequency;
and
a constant current (CC)-to-constant voltage (CV) network comprising at least a third capacitor and a third inductor, the CC-to-CV network configured for resonant operation at the defined frequency, the CC-to-CV network converting the constant AC current signal into a constant AC voltage signal at the defined frequency.

1 more element

A method for reducing reactive power in a wireless power transfer (WPT) system, the method comprising:

providing a compensation network comprising:
a series/series (S/S) constant current (CC) source comprising a transformer and a S/S compensation network for the transformer, the S/S compensation network consisting of a first compensation capacitor and a second compensation capacitor, the first compensation capacitor being connected in series with a first inductor on a primary side of the transformer and the second compensation capacitor being connected in series with a second inductor on a secondary side of the transformer, the first compensation capacitor, the first inductor and a mutual inductance of the transformer configured for resonant operation at a defined frequency;
and
a constant current (CC)-to-constant voltage (CV) network comprising at least a third capacitor and a third inductor, the CC-to-CV network configured for resonant operation at the defined frequency;
with the S/S CC source, converting an input voltage signal of the WPT system into a constant alternating current (AC) current signal at the defined frequency;
and
with the CC-to-CV network, converting the constant AC current signal into a constant AC voltage signal at the defined frequency.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/913,066Filed 26 Jun 2020
Published: US 2021/0408923 A130 Dec 2021
Granted: 4 Jun 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H02J 50/12
Using inductive coupling: of the resonant type
H02M 1/0058
Transistor switching losses: by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current…
H02M 1/4266
Arrangements for improving power factor of AC input: using passive elements
H02M 3/33573
Having several active switching elements: full-bridge at primary side of an isolation transformer