Wireless power receiver circuit and method for measuring available power
A wireless power and receiver technology, applied in the field of wireless power supply system, can solve the problems of power supply system collapse, wireless power converter drop, and influence on power conversion, etc., to achieve a good feeling effect
Active Publication Date: 2017-03-01
MEDIATEK SINGAPORE PTE LTD SINGAPORE
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Problems solved by technology
However, assuming that the receiver device can only draw 0.5 watts of power from the wireless power source, and the device to be charged needs to use 1 watt of power to charge its battery device, it means that this charging behavior will cause the power supply system to collapse
At this point, the voltage at the output of the wireless power converter will drop, causing charging to terminate
Then, charging may resume, leading to limit-cycling behavior
In addition, the overload of the wireless power source will also affect the power conversion of other devices in the system
Method used
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[0015] The invention discloses a method for a wireless power receiver to independently measure instantaneous available power. The receiver can use this information to intelligently control its power draw to ensure a good experience for the user.
[0016] figure 1 A simplified schematic diagram of a wireless power receiver circuit 2 is shown. The wireless power receiver circuit 2 includes an electromagnetic resonator, a rectifier circuit and a load connected in sequence. The electromagnetic resonator includes one or more inductive elements forming a receiver coil and passive elements forming a matching network. In this implementation manner, the electromagnetic resonator includes an inductor L2 (ie, receiver coil) and capacitors C2a and C2b connected in parallel. The capacitors C2a and C2b form the matching network, and the matching network can output AC power at its output terminal. Specifically, the power coupled to the inductor L2 by the source inductor (not shown in the...
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The present invention provides a wireless power receiver circuit, including: an electromagnetic resonator, including a receiver coil for receiving a power source and a matching network, and the matching network outputs an AC power; a rectifier circuit for AC power from the electromagnetic resonator is converted to DC power; and an available power indicator for measuring power rectified by the rectifier circuit to estimate the wireless power receiver circuit based on the measurement result The instantaneous available power, and judge whether the instantaneous available power is enough to drive a load circuit. The present invention also provides a method of measuring available power for use in the wireless power receiver circuit.
Description
technical field [0001] The present invention relates to a wireless power supply system, in particular to a resonant wireless power receiver circuit capable of independently measuring instantaneous available power and a method for measuring available power. Background technique [0002] In a resonant wireless power (RWP) system, multiple power receiver devices can simultaneously receive power from a single source through near-field magnetic coupling. The coupling factor or mutual inductance between each receiver coil and the source coil can vary according to the relative position and orientation of the coils. Even though the receiver coils are not directly coupled to each other, each receiver coil can still affect the power conversion of other receiver coils through interactions with the source coil. There must be a limit to the amount of power that can be transferred from the source to the receiver. Thus, the available (or available) power delivered to any receiver at a gi...
Claims
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IPC IPC(8): H02J50/10G01R21/133
CPCH02J7/025G01R21/133G01R29/0871H02J50/12H02M7/066
Inventor 阿南德·萨慕斯派翠克史丹利里尔
Owner MEDIATEK SINGAPORE PTE LTD SINGAPORE