money.cnn.com— A Pennsylvania entrepreneur has developed technology that gives you all the battery juice you need directly from the air.
Mar 30, 2007View in Crawl 4
* sigh * does anyone know basic science anymore?Electromagnetic waves(radio) are composed of two perpendicular force fields. One of the forces is the magnetic field and the other is the electric field.Michael Faraday(and probably others) found out that magnetism and electricity were initimate. Move an electric charge(and the field around it) and a magnetic field pops into existance. Move a magnetic field around a thing that can hold a charge(a conductor) and an electric field pops into existance.light/radio/xrays/photons/infrared/gamma/microwaves are simply electric and magnetic fields. The simple theory of electromagnetic wave propagation is that at some instant in time a photon has only a magnetic field, but there is nothing to hold this in place so it collapses(moves), this makes a perpendicular electric field, but it has nothing "holding" it up, so it collapses, but this induces another magnetic field, which collapses.... etc. This propagates at the speed of light.Generators move magnets around conductors and make electric fields which push elecrons through the conductor.Motors move electrons through conductors and move magnets.Radios tap the electric field and amplify them so you can hear what information is being carried.
To answer your questions...The energy conversion process from radio waves to electricity is 90% efficient. A brief brush up on thermodynamics for you. First law states energy must be conserved. Secondly, the second law of thermodynamics states that over time temperature, pressure, and density will tend to even themselves out over time in a physical system. Finally, 3rd law states that no system can reach a temperature of absolute zero in a finite number of steps, or more concisely, no system can ever reach absolute zero. None of these laws dictate the efficiency of a system.Yes there is enough power in the air for this device to work. The device works on the principle of resonance. This means a small input generates a large output which makes the device more efficient. So a small amount of RF in the air can be enough to power small electronic devices or recharge their batteries.And finally, yes it is possible to tune this device to multiple frequencies. If you place taps on an inductor at varying distances along its total length you will tune into different frequencies based on the varying inductance of the different portions of the overall inductor. That is basically how this device works. It is just an inductor (coil of wire) with wires soldered to it along its length in strategic locations to tune into RF frequencies that want to be used for power. Read the patent.
You missed what I was saying. First of all the 2nd law of thermodynamics covers matter and temperature equilibrium over time and not conversion of RF energy into electricity. Secondly, a wireless power device that works by capturing RF energy from the air will not capture 90% of the energy that was transmitted by the transmitter. It will capture 90% of the RF energy that it intercepts, however. Of course transmitters will transmit energy in multiple directions and a lot of it will be wasted. But the conversion from RF to DC electricity is still 90% efficient even if power is wasted from the transmitter in directions away from the wireless power device's antenna.Finally concerning resonance,In the wireless charger design, alternating current from the mains is converted to this resonant frequency and sent into the circuit. The current travels round the circuit, generating a magnetic field as it passes through the inductor loop and an electric field as it passes through the capacitor. This pulsing magnetic field extends up to 5 metres around the device.The magnetic field created by the wireless charger is relatively weak, meaning it consumes little power. However, if a mobile gadget fitted with a similar circuit, with the same resonant frequency, is brought into the room, the charger's magnetic field induces an electric current in the gadget's inductor loop.This current travels round the mobile device's circuit, constantly switching between electrical and magnetic states, just as in the charger's circuit. As a result, the two circuits start to "resonate" together. This increases the transmission of electromagnetic energy via induction and that energy is used to charge up the gadget.The electrical waves created on antennas typically have a fixed wavelength. If the length of the antenna is wisely chosen it's possible to make it resonate. An antenna will still transmit even if the length is not ideal for resonance. However, less of the power input to the transmitter will actually show up as useful output signal. In other words, the efficiency of the system will be significantly lower.If the receiving device and the transmitting device both have resonant circuits at the same frequency and they both transmit and receive, they will effectively increase each other by accumulating that transmitted energy in each other's circuit which continually increases the transmitted power as long as the two devices are within range of one another up to a maximum value.<a class="user" href="http://www.intuitor.com/resonance/abcRes.html">http://www.intuitor.com/resonance/abcRes.html</a>
Really, it's not even through air. Electromagnetic waves travel through spacetime. Also, this technology is called induction. It's the same thing that powers RFID chips. Not sure what's so revolutionary about this... sounds like marketing hype to me.John - unlocked cell phones - unlocked phones - cell phone accessories<a class="user" href="http://www.cellular-blowout.com">http://www.cellular-blowout.com</a>
s1ngular1ty1Mar 31, 2007
Yes power falls off inversely proportional to the square of the distance between you and the source. Which is pretty freaking fast.
kurtu5Mar 31, 2007
* sigh * does anyone know basic science anymore?Electromagnetic waves(radio) are composed of two perpendicular force fields. One of the forces is the magnetic field and the other is the electric field.Michael Faraday(and probably others) found out that magnetism and electricity were initimate. Move an electric charge(and the field around it) and a magnetic field pops into existance. Move a magnetic field around a thing that can hold a charge(a conductor) and an electric field pops into existance.light/radio/xrays/photons/infrared/gamma/microwaves are simply electric and magnetic fields. The simple theory of electromagnetic wave propagation is that at some instant in time a photon has only a magnetic field, but there is nothing to hold this in place so it collapses(moves), this makes a perpendicular electric field, but it has nothing "holding" it up, so it collapses, but this induces another magnetic field, which collapses.... etc. This propagates at the speed of light.Generators move magnets around conductors and make electric fields which push elecrons through the conductor.Motors move electrons through conductors and move magnets.Radios tap the electric field and amplify them so you can hear what information is being carried.
jimbo100Mar 31, 2007
@quomen: Carcinogenic dear, carcinogenic
s1ngular1ty1Mar 31, 2007
Actually radios tap into the magnetic portion of an electromagnetic wave via induction via an antenna.
s1ngular1ty1Apr 3, 2007
To answer your questions...The energy conversion process from radio waves to electricity is 90% efficient. A brief brush up on thermodynamics for you. First law states energy must be conserved. Secondly, the second law of thermodynamics states that over time temperature, pressure, and density will tend to even themselves out over time in a physical system. Finally, 3rd law states that no system can reach a temperature of absolute zero in a finite number of steps, or more concisely, no system can ever reach absolute zero. None of these laws dictate the efficiency of a system.Yes there is enough power in the air for this device to work. The device works on the principle of resonance. This means a small input generates a large output which makes the device more efficient. So a small amount of RF in the air can be enough to power small electronic devices or recharge their batteries.And finally, yes it is possible to tune this device to multiple frequencies. If you place taps on an inductor at varying distances along its total length you will tune into different frequencies based on the varying inductance of the different portions of the overall inductor. That is basically how this device works. It is just an inductor (coil of wire) with wires soldered to it along its length in strategic locations to tune into RF frequencies that want to be used for power. Read the patent.
s1ngular1ty1Apr 7, 2007
You missed what I was saying. First of all the 2nd law of thermodynamics covers matter and temperature equilibrium over time and not conversion of RF energy into electricity. Secondly, a wireless power device that works by capturing RF energy from the air will not capture 90% of the energy that was transmitted by the transmitter. It will capture 90% of the RF energy that it intercepts, however. Of course transmitters will transmit energy in multiple directions and a lot of it will be wasted. But the conversion from RF to DC electricity is still 90% efficient even if power is wasted from the transmitter in directions away from the wireless power device's antenna.Finally concerning resonance,In the wireless charger design, alternating current from the mains is converted to this resonant frequency and sent into the circuit. The current travels round the circuit, generating a magnetic field as it passes through the inductor loop and an electric field as it passes through the capacitor. This pulsing magnetic field extends up to 5 metres around the device.The magnetic field created by the wireless charger is relatively weak, meaning it consumes little power. However, if a mobile gadget fitted with a similar circuit, with the same resonant frequency, is brought into the room, the charger's magnetic field induces an electric current in the gadget's inductor loop.This current travels round the mobile device's circuit, constantly switching between electrical and magnetic states, just as in the charger's circuit. As a result, the two circuits start to "resonate" together. This increases the transmission of electromagnetic energy via induction and that energy is used to charge up the gadget.The electrical waves created on antennas typically have a fixed wavelength. If the length of the antenna is wisely chosen it's possible to make it resonate. An antenna will still transmit even if the length is not ideal for resonance. However, less of the power input to the transmitter will actually show up as useful output signal. In other words, the efficiency of the system will be significantly lower.If the receiving device and the transmitting device both have resonant circuits at the same frequency and they both transmit and receive, they will effectively increase each other by accumulating that transmitted energy in each other's circuit which continually increases the transmitted power as long as the two devices are within range of one another up to a maximum value.<a class="user" href="http://www.intuitor.com/resonance/abcRes.html">http://www.intuitor.com/resonance/abcRes.html</a>
zolushkatykvaMay 6, 2007
Perfect! Almost all people think so
sportfan98May 25, 2007
Really, it's not even through air. Electromagnetic waves travel through spacetime. Also, this technology is called induction. It's the same thing that powers RFID chips. Not sure what's so revolutionary about this... sounds like marketing hype to me.John - unlocked cell phones - unlocked phones - cell phone accessories<a class="user" href="http://www.cellular-blowout.com">http://www.cellular-blowout.com</a>
netfreezJul 31, 2007
good comment about Tesla, I have read about it dating back to high school.<a class="user" href="http://www.netfreez.com">http://www.netfreez.com</a>
superzornAug 16, 2007
Amazing. Things never change. <a class="user" href="http://travelsphere.blogspot.com">http://travelsphere.blogspot.com</a>
orkutsmorkutAug 16, 2007
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cellphonecameraJun 22, 2010
This is a good start for a wireless charging capabilities if this is true. Cell Phone Reviews<a class="user" href="http://www.shopscellphone.com" rel="nofollow">http://www.shopscellphone.com</a>