In February Patently Apple published a report titled "Apple, Samsung in Race to deliver Wireless Charging Systems." In that report we noted that a recent Apple patent revealed a new idea covering a virtual charging around a desktop that could charge multiple devices at one time. We also pointed out that Samsung co-developed a receiving circuit for wireless chargers based on magnetic resonance. Today's patent report briefly covers Samsung's patent pending invention regarding wireless charging.
Samsung's Patent Background
Wireless power transfer, also referred to as wireless energy transfer or wireless charging, to electronic devices is becoming a global standard. The benefits of wireless power transfer (WPT) compared to wired power transfer can be summarized as follows:
Convenience: Users should not need to carry multiple wired chargers with them to charge devices such as laptops, mobile phones, tablets, notebooks, and the like. Instead, a wireless charger can be placed in areas such as conference rooms, coffee shop tables, airport waiting areas, at home, and so forth, and users can charge their electronic devices by simply placing the device close to a wireless charger, without having to use a wired connection. Standardization of the WPT systems will allow for charging of multiple devices, possibly of different make and model, from the same wireless charger, leading to a universal charging standard.
Practicality: The number of physical power outlets available in areas such as conference rooms, coffee shops, airport waiting areas, and the like is limited, thus restricting the number of users that have access to them. A wireless power transfer system overcomes this issue and offers fast and easy charging to multiple users simultaneously.
Transparency: Wireless power can penetrate various objects such as wood, plastic, paper and cloth, making power transfer possible to locations where physical wire access is either not recommended or impossible, such as implant devices, under water, moving while charging, and the like.
Green: Wireless power transfer is in accordance with the Universal Charging Solution (UCS) proposed by the International Telecommunication Union, a United Nations branch. In essence, UCS recommends the same charger to be used for all future handsets, regardless of make and model, yielding a 50 percent reduction in standby energy consumption, elimination of 51,000 tons of redundant chargers, and a subsequent reduction of 13.6 million tons in greenhouse gas emissions each year (source: the website of International Telecommunication Union).
Samsung's invention involves an apparatus which includes a transmit resonator that includes at least two loop resonators that generate a magnetic field in the near-field zone (non-radiative), the at least two loop resonators being disposed in such that the magnetic field produced by each is substantially orthogonal to that produced by the other at a certain or specific portion of the zone.
Specifically, the at least two loop resonators are oriented substantially perpendicular to each other. The apparatus also includes a power divider configured to split a signal into at least two sub-signals fed to the at least two resonators with amplitude weighting coefficients.
Another apparatus associated with this invention includes a receiver resonator including at least two loop resonators capable of resonating in the presence of an external non-radiative magnetic field, the at least two loop resonators being disposed in such that the magnetic field received by each is substantially orthogonal to that received by the other. Specifically, the at least two loop resonators are oriented substantially perpendicular to each other. A power combiner is configured to combine sub-signals received from the at least two loop resonators.
Samsung's invention includes a method that includes controlling the polarization of a magnetic field in the near-field zone, by shifting phases of the signals in at least one of the two loop resonators, in order to optimize the received power with respect to polarization of the generated magnetic field in the near-field zone. The method further includes combining sub-signals generated from the at least two loop resonators.
Samsung's patent FIG. 3 illustrates a transmitter and a receiver operating under the linear polarization mode; FIG. 4 depicts how the linearly polarized magnetic field oscillates with time on a straight line but at different orientations depending on the location in the space around the resonator.
Our Cover graphic covers Samsung's patent FIG. 2 which illustrates a block diagram for the wireless power transmission.
Samsung filed their patent application back in Q1 2013 in the US and in Q2 2012 in Korea. Considering that this is a patent application, the timing of such a product to market is unknown at this time.
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