Power generation circuit using electromagnetic wave

• US 20050254183A1
• Filed: 05/03/2005
• Published: 11/17/2005
• Est. Priority Date: 05/12/2004
• Status: Active Grant

• Current Assignee: Makoto Ishida, Ablic Inc. (MinebeaMitsumi Inc.)
• Original Assignee: Makoto Ishida, Seiko Instruments Incorporated (Seiko Group)
• Inventors: Ishida, Makota, Sudo, Minoru, Sawada, Kazuaki, Takao, Hidekuni
• Granted Patent: US 7,956,593 B2
• Time in Patent Office: Days
• US Class Current: 361/18
• CPC Class Codes: H02J 50/001 Energy harvesting or scavenging
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves

Abstract

A power generation circuit using an electromagnetic wave which does not require any additional energy is provided. Power generation is performed by utilizing the electromagnetic wave existing in a space for living.

Claims

1. A power generation circuit using energy of an electromagnetic wave, comprising:

one of an antenna or a coil for receiving an electromagnetic wave;

a rectifying circuit formed on a silicon substrate, for rectifying a signal from the antenna or the coil; and

a circuit for storing an output power from the rectifying circuit,

wherein power generation is performed by utilizing the energy of the electromagnetic wave; and

the electromagnetic wave is a commercially available electromagnetic wave.

2. A power generation circuit using energy of an electromagnetic wave according to claim 1,

wherein a source and a drain of an enhanced MOS transistor are connected to an output of the storage circuit and a load respectively;

and control of connecting the storage circuit and the load is performed by utilizing a threshold voltage of the enhanced MOS transistor.

3. A power generation circuit using energy of an electromagnetic wave according to claim 1,

wherein a recess is formed in the silicon substrate;

a projecting terminal that conforms to a shape of the recess in the silicon substrate is formed on one of the antenna and the coil; and

an electrical connection is established between the antenna or the coil and an element formed on the silicon substrate by inserting the projecting terminal of the antenna into the recess in the silicon substrate.

4. A power generation circuit using energy of an electromagnetic wave according to claim 2,

wherein a recess is formed in the silicon substrate;

a projecting terminal that conforms to a shape of the recess in the silicon substrate is formed on one of the antenna and the coil; and

an electrical connection is established between the antenna or the coil and an element formed on the silicon substrate by inserting the projecting terminal of the antenna into the recess in the silicon substrate.

5. A power generation circuit using energy of an electromagnetic wave according to claims 1, wherein the electromagnetic wave exists in a space for living.

6. A power generation circuit using energy of an electromagnetic wave according to claims 2, wherein the electromagnetic wave exists in a space for living.

7. A power generation circuit using energy of an electromagnetic wave according to claims 3, wherein the electromagnetic wave exists in a space for living.

8. A power generation circuit using energy of an electromagnetic wave according to claims 4, wherein the electromagnetic wave exists in a space for living.

9. A power generation circuit using energy of an electromagnetic wave, comprising:

one of an antenna or a coil for receiving an electromagnetic wave;

a rectifying circuit formed on a silicon substrate, for rectifying a signal from one of the antenna or the coil;

a booster circuit for boosting an output of the rectifying circuit;

a storage circuit for storing an output power from the booster circuit;

a detecting circuit for detecting a voltage of the storage circuit; and

a switching circuit for connecting the storage circuit and a load,

wherein power generation is performed utilizing the energy of the electromagnetic wave; and

the switching circuit is turned on to connect the storage circuit and the load when the detecting circuit detects that the voltage of the storage circuit is equal to or greater than a defined voltage.

10. A power generation circuit using energy of an electromagnetic wave, comprising:

one of an antenna or a coil for receiving an electromagnetic wave;

a rectifying circuit formed on a silicon substrate, for rectifying a signal from one of the antenna or the coil;

a booster circuit for boosting an output of the rectifying circuit;

a storage circuit for storing an output power from the booster circuit;

a detecting circuit for detecting a voltage of the storage circuit;

a switching circuit for connecting the storage circuit and a load; and

a mono-stable multi-vibrator circuit whose input is a signal from the detector circuit,

wherein power generation is performed by utilizing the energy of the electromagnetic wave; and

the switching circuit is turned on for a defined period of time determined by the mono-stable multi-vibrator circuit when the detecting circuit detects that the voltage of the storage circuit is equal to or greater than a defined voltage to connect the storage circuit and the load.

11. A power generation circuit using energy of an electromagnetic wave, comprising:

one of a first antenna or a first coil for receiving an electromagnetic wave of a first frequency;

a first rectifying circuit formed on a silicon substrate, for rectifying a signal from one of the first antenna or the first coil;

a booster circuit for boosting an output of the first rectifying circuit;

an storage circuit for storing an output power from the booster circuit;

a switching circuit for connecting the storage circuit and a load;

one of a second antenna or a second coil for receiving an electromagnetic wave of a second frequency different from the electromagnetic wave of the first frequency received by the first antenna or the coil; and

a second rectifying circuit formed on the silicon substrate, for rectifying a signal from one of the second antenna or the second coil,

wherein one of the first antenna or the coil performs power generation by utilizing the energy of the electromagnetic wave of the first frequency;

the energy is accumulated in the storage circuit; and

the switching circuit is turned on to connect the storage circuit and the load, when power generation is performed by the second rectifying circuit after receiving the electromagnetic wave of the second frequency, which has a different frequency from the electromagnetic wave of the first frequency, by the second antenna or the second coil.

12. A power generation circuit using energy of an electromagnetic wave, comprising:

one of a first antenna or a first coil for receiving an electromagnetic wave;

a first rectifying circuit formed on a silicon substrate, for rectifying a signal from the first antenna or the first coil;

a booster circuit for boosting an output of the first rectifying circuit;

a storage circuit for storing an output power from the booster circuit;

a switching circuit for connecting the storage circuit and a load;

one of a second antenna or a second coil for receiving an electromagnetic wave having a different frequency than the frequency of the electromagnetic wave received by the first antenna;

a second rectifying circuit formed on the silicon substrate, for rectifying a signal from the second signal; and

a mono-stable multi-vibrator circuit whose input is a signal from the second rectifying circuit,

wherein one of the first antenna and the first coil performs power generation by utilizing the energy of the electromagnetic wave;

the energy is stored in the storage-circuit; and

the switching circuit is turned on for a defined period of time determined by the mono-stable multi-vibrator circuit to connect the storage circuit and the load, when power generation is performed by the second rectifier circuit after receiving an electromagnetic wave, which has a different frequency from the frequency of the electromagnetic wave received by the first antenna or the first coil, by one of the second antenna or the second coil.