Wireless power source

• US 8,760,009 B2
• Filed: 05/25/2011
• Issued: 06/24/2014
• Est. Priority Date: 05/25/2011
• Status: Expired due to Fees

• Current Assignee: Samuel Gong
• Original Assignee: Samuel Gong
• Inventors: Gong, Samuel
• Primary Examiner(s): Deberadinis, Robert L.
• Application Number:
  US13/115,853
• Publication Number:
  US 20120299388A1
• Time in Patent Office: 1,126 Days
• Field of Search: 307/104
• US Class Current: 307/104
• 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 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type

Abstract

A wireless power transmission system includes a transmitting portion and a receiving portion. The transmitting portion includes an inductive coil as a transmitting antenna. The inductive coil will have 20-40 turns. A control circuit includes a field-effect transistor, a signal generator, and a capacitor with a resistor in parallel connection with the capacitor. The capacitor is typically a 1.5 microFarad Mylar® film capacitor. The resistor will be 2-4 ohms. The field-effect transistor may be a Metal Oxide Semiconductor Field Effect Transistor (MOSFET). The receiving unit has at least one loop stick antenna located at a distance from a center of the coil of up to twice a diameter of the coil. The circuit is tunable between 6 kHz and 10 kHz. 8 kHz has been found to be optimal. The inductive transmitting coil is closely coupled. The loop stick antennae of the receiving portion may have an iron core or a ferrite core.

Claims

1. A wireless power transmission system comprising:

a transmitting unit, said transmitting unit comprising;

an inductive coil, said inductive coil serving as a transmitting antenna;

a circuit comprising a field-effect transistor, a signal generator, and a

capacitor with a resistor in parallel connection with the capacitor, said

circuit being tunable between 6 khz and 10 khz; and

a receiving unit, said receiving unit having at least one loop stick antenna disposed at a distance from a center of said coil of up to twice a diameter of said coil.

2. The wireless power transmission system, as described in claim 1, wherein said field-effect transistor is an N channel Metal-Oxide-Semiconductor Field-effect Transistor.

3. The wireless power transmission system, as described in claim 1, wherein said signal generator is a square wave generator.

4. The wireless power transmission system, as described in claim 1, wherein said capacitor is a 1.5 microFarad Mylar film capacitor.

5. The wireless power transmission system, as described in claim 1, wherein said resistor ranges in value from 2-4 ohms.

6. The wireless power transmission system, as described in claim 1, wherein said inductive coil is closely coupled.

7. The wireless power transmission system, as described in claim 1, wherein said inductive coil has 20-40 turns.

8. The wireless power transmission system, as described in claim 1, wherein optimal tuning for said circuit is 8 khz.

9. The wireless power transmission system, as described in claim 1, wherein said at least one loop stick antenna has an iron core.

10. The wireless power transmission system, as described in claim 1, wherein said at least one loop stick antenna has a ferrite core.

11. The wireless power transmission system, as described in claim 9, wherein said iron core is approximately 1 in.×

0.5 in.×

3 in.