Device and Method of Non-Contact Energy Transmission

• US 20070267918A1
• Filed: 04/29/2005
• Published: 11/22/2007
• Est. Priority Date: 04/30/2004
• Status: Active Grant

• Current Assignee: Geir Gyland
• Original Assignee: Geir Gyland
• Inventors: Gyland, Geir
• Granted Patent: US 8,125,208 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H01F 38/08 High-leakage transformers or inductances
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02M 3/01 Resonant DC/DC converters
• CPC Class Codes: H02M 3/33571 Half-bridge at primary side of an isolation transformer
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A device and method for non-contact transmission of electrical energy by means of a transformer (1) comprising at least a primary side (2) and at least a secondary side (8), and where resonance is set up in a circuit comprising the primary winding (4) of the transformer (1) and a capacitor (14) connected in series with the primary winding (4).

Claims

1. A transformer device comprising at least a primary side and at least a secondary side separate from the primary side, for transmission of electrical energy without electrical connection, where the primary winding of the transformer is connected in series with a capacitor, and where the capacitor, mainly together with the leakage inductance of the transformer, forms a resonant circuit, wherein the resonant circuit is connected to a frequency controllable current source.

2. A device in accordance with claim 1, wherein the frequency controllable current source is controlled by means of a feedback loop from the load on the secondary side of the transformer.

3. A device in accordance with claim 1, wherein the resonant circuit has a frequency impressed on it, which is higher than the frequency of resonance.

4. A method of non-contact transmission of electric energy by means of a transformer comprising at least a primary side and at least a secondary side, where resonance is set up in a circuit comprising the primary winding of the transformer and a capacitor connected in series with the primary winding, wherein the resonant circuit is connected to a frequency controlled source of current.

5. A method in accordance with claim 4, wherein the resonant circuit is used as a selective filter to convert a square-wave signal into a predominantly sinusoidal signal.

6. A method in accordance with claim 4, wherein the frequency impressed on the primary winding of the transformer is controlled by means of a feedback loop that communicates with the secondary side of the transformer.