Electro-acoustic device charging and power supply
An electroacoustic portable device charger and direct power adaptor. Ultrasonic transducers transmit acoustic energy which is converted into electrical power for the purposes of charging portable device batteries. Specifically, a wireless personal data device (such as a mobile phone) charging pad is disclosed. Feedback control loop and phased piezo array steer acoustic wavefronts into receiver transducers without the threat of electromagnetic interference. Parameters are monitored to maximize power efficiency and transmission. Device cradles and covers can be retrofitted to accommodate piezo electronics or integrated therein.
1. A portable device charging system comprising:
a transmitter comprising:
an electroacoustic charging pad having one or more electroacoustic transmitting elements;
a power source;
a signal generator;
an amplifier;
a proximity switch; and
a first antenna;
a receiver comprising:
one or more electroacoustic receiving elements;
a battery; and,
a second antenna;
whereby, said first and second antennae are in electromagnetic communication and said electroacoustic transmitting and receiving elements are in ultrasonic communication,
said proximity switch senses a location of said receiver on said charging pad, and
said controller only activates said electroacoustic transmitting elements proximal to said location.
2. The charging system of claim 1 , wherein said power source is a direct current.
3. The charging system of claim 1 , wherein said power source is an alternating current.
4. The charging system of claim 1 , whereby signals are generated by said signal generator and amplified by said amplifier.
5. The charging system of claim 4 , whereby said amplified signals are transmitted over said one or more electroacoustic transmitting elements.
6. The charging system of claim 5 , whereby said transmitted ultrasonic signals are received by said electroacoustic receiving elements.
7. The charging system of claim 1 , wherein said controller controls a feedback control loop.
8. The charging system of claim 7 , wherein parameters utilized in said feedback control loop are transmitted over first and second antennae via electromagnetic communication.
9. The charging system of claim 1 , wherein said one or more electroacoustic transmitting elements comprise an electroacoustic material such as a piezoelectric material.
10. The charging system of claim 1 , wherein said one or more electroacoustic transmitting elements are comprised by a phased array.
11. The charging system of claim 1 , wherein said receiver is integrated into a personal data device.
12. The charging system of claim 1 , whereby said one or more electroacoustic transmitting elements transmit at a frequency between 500 kHz and 2 MHz.
13. The charging system of claim 1 , wherein said one or more electroacoustic transmitting elements and electroacoustic receiving elements are disposed less than 1 cm from one another.
14. The charging system of claim 13 , wherein said charging pad includes a charging surface comprised of an acoustic medium, said acoustic medium disposed between said one or more electroacoustic transmitting elements and electroacoustic receiving elements, the acoustic medium excluding air between said one or more electroacoustic transmitting elements and electroacoustic receiving elements.
15. The charging system of claim 14 , wherein the acoustic medium is a low loss material between the frequencies of 500 kHz and 2 MHz.
16. The charging system of claim 1 , wherein the density of said one or more electroacoustic transmitting elements is between 20-45 elements per square inch.
17. The charging system of claim 1 , further comprising a mechanical alignment stage disposed on said charging pad.
18. The charging system of claim 1 , further comprising any of: a power output monitor, rectifier, a voltage regulator, a phase delay circuit, and a clock.
19. A system for delivering energy to power or charge an electrical source, comprising:
an electrical power supply;
a transmitting ultrasound transducer that takes electrical energy from said electrical power supply and transmits an ultrasound energy wavefront in a determined direction;
a receiving ultrasound transducer, coupled to said transmitting ultrasound transducer through an acoustic coupling medium, that receives said ultrasound energy wavefront and generates a generated electrical output through transduction in said receiving ultrasound transducer;
an electronic signal conditioning circuit including a rectifier receiving said generated electrical output and outputting a conditioned electrical output;
a controller for controlling an amount of conditioned electrical output to generate a controlled electrical output; and
a battery unit receiving said controlled electrical output so as to charge said battery with electrical energy derived from said controlled electrical output.
20. The charging system of claim 17 , further comprising an acoustic coupling medium disposed in mechanical alignment flanges of said mechanical alignment stage, the acoustic coupling medium comprising a gel pad, an ultrasound coupling pad, or a liquid.