Device for collecting energy wirelessly

• US 9,601,928 B2
• Filed: 03/14/2014
• Issued: 03/21/2017
• Est. Priority Date: 03/14/2013
• Status: Active Grant

• Current Assignee: Choon Sae Lee
• Original Assignee: Choon Sae Lee
• Inventors: Lee, Choon Sae
• Primary Examiner(s): Tan, Richard
• Application Number:
  US14/210,740
• Publication Number:
  US 20140265618A1
• Time in Patent Office: 1,103 Days
• Field of Search: 307/104
• US Class Current: 1/1
• CPC Class Codes: H02J 50/05 using capacitive coupling
• CPC Class Codes: H02J 50/12 of the resonant type

Abstract

A device for collecting energy has first, second and third capacitive plates, each spaced from, substantially parallel to, and electromagnetically coupled to each other. An inductor is coupled between two of the plates, and a load resistance is inductively coupled to the inductor for drawing energy from electromagnetic field excitation between the plates. In a further embodiment, the inductor includes a first inductor coupled in series with a second inductor, and the load resistance is inductively coupled to the second inductor for drawing energy from electromagnetic field excitation between the plates, and the device further includes a first capacitor coupled in parallel with and spaced apart from the first inductor, and a second capacitor coupled between the first and second capacitive plates. In a still further embodiment, energy is collected by a coaxial transmission feed line.

Claims

1. A device for collecting energy, the device comprising:

a first capacitive plate;

a second capacitive plate spaced from, substantially parallel to, and electromagnetically coupled to the first capacitive plate;

an inductor coupled between the first capacitive plate and the second capacitive plate;

a first capacitor coupled between the first capacitive plate and the second capacitive plate;

a transmission line coupled to the first capacitive plate and extending through a hole defined in the second capacitive plate for drawing energy from electromagnetic field excitation between the first capacitive plate and the second capacitive plate; and

a second capacitor coupled in series with the transmission line between the first capacitive plate and the second capacitive plate.

2. The device of claim 1 further comprising:

a third capacitive plate spaced from, substantially parallel to, and electromagnetically coupled to the first capacitive plate; and

a third capacitor coupled between the first capacitive plate and the third capacitive plate.

3. The device of claim 1, further comprising:

wherein the first capacitive plate and the second capacitive plate are sized and spaced, and the first capacitor and the inductor are sized, for facilitating resonance at a first frequency for facilitating energy collection at a second frequency.

4. The device of claim 1, further comprising a load resistance coupled to the transmission line, wherein the load resistance is at least one of a cell phone, a portable computer, a security sensor, a radio-frequency identification (RFID) tag, a cordless keyboard, and a cordless mouse.

5. A device for collecting energy, the device comprising:

a first capacitive plate;

a second capacitive plate spaced from, substantially parallel to, and electromagnetically coupled to the first capacitive plate;

a first load resistor and a first inductor connected in series between the first capacitive plate and the second capacitive plate; and

a second load resistor and a second inductor and a capacitor connected in series between the first capacitive plate and the second capacitive plate;

wherein the first inductor and the second inductor form a transformer having a mutual coupling factor m; and

wherein the first load resistor, the first inductor, the second load resistor, the second inductor, the capacitor, and the mutual coupling factor m are selected so that net current flowing between the first capacitive plate and the second capacitive plate is substantially zero and total impedance between the first capacitive plate and the second capacitive plate is as large as reasonably possible.

6. The device of claim 5, wherein the first load resistor and the first inductor are serially connected via a conducting wire positioned between the first capacitive plate and the second capacitive plate.

7. The device of claim 5, wherein the second load resistor, the second inductor, and the capacitor are serially connected via a conducting wire positioned between the first capacitive plate and the second capacitive plate.

8. The device of claim 5, wherein the first load resistor and the first inductor are serially connected via a first conducting wire, the second load resistor, the second inductor, and the capacitor are serially connected via a second conducting wire, and the first conducting wire and the second conducting wire are spaced apart.