Method and apparatus for power loss calibration in wireless power systems
A power and transmit power technology, applied in the field of foreign object detection, which can solve the problem of difficulty in accurately determining when the loss is
Active Publication Date: 2022-04-08
TEXAS INSTR INC
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Problems solved by technology
However, as described further below, several measurement limitations make it difficult to determine exactly when losses are caused by foreign objects, or when losses are caused by otherwise acceptable losses within the transmission system
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[0014] Corresponding numerals and symbols in the different figures generally refer to corresponding parts unless otherwise indicated. The drawings are not necessarily drawn to scale.
[0015] The term "coupled" may include established connections with intermediate elements, and there may be additional elements and various connections between any elements "coupled".
[0016] figure 1 is a block diagram of a simplified wireless power transfer system 100 . The transmission unit 110 includes a transmitter 114 , a power source 112 and a coil 116 . The power supply 112 may be a direct current (DC) power source derived from a power outlet. The voltage of the power supply 112 is typically in the range of about 5 volts to about 24 volts. Coil 116 is part of a resonant circuit that includes one or more capacitors (not shown), which may be connected in series and / or in parallel with coil 116 . Transmitter 114 converts the DC voltage provided by power supply 112 to alternating curren...
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The present invention relates to methods and apparatus for power loss calibration in wireless power systems. In the depicted example, the integrated circuit (334) includes a communication (334B) and control unit (334A). The communication and control unit (334) controls the inverter (332), which applies the AC output signal to the transmission coil (316) for reception by the receiver. The communication and control unit causes the inverter to supply the first transmission power and the second transmission power to the transmission coil, and in response to the first transmission power and the second transmission power, the communication unit receives the first power reception signal and the second power from the receiver receive signal. The communication and control unit determines a first gain and a first offset using the first transmit power, the first power. When the third transmission power greater than the second transmission power is transmitted by the transmission coil, the communication and control unit uses the first transmission power, the first power reception signal, the third transmission power and the third power reception signal to determine the second gain and the second offset.
Description
technical field [0001] The present invention relates generally to wireless power transfer, and more particularly to foreign object detection in wireless power transfer. Background technique [0002] Wireless transfer of power is very useful, such as in charging of battery operated devices. One of the more popular applications of this technology is to charge cellular phones. The cell phone (receiver) is placed on the powered transmitter such that the tuning coil in the receiver is aligned with the tuning coil in the transmitter. The alignment coil acts as a transformer to transfer power wirelessly from the transmitter to the receiver. The energy received by the phone is used to charge the battery in the phone. [0003] One of the most challenging aspects for wireless power transfer is preventing metal objects (foreign objects) from heating in the magnetic field (ie, between the coils of the transmitter and receiver). The Wireless Power Consortium (WPC) has been trying to ...
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IPC IPC(8): H02J50/60
CPCH02J50/80H02J50/12H02J50/60H04B5/79
Inventor E·G·奥廷格K·N·西达巴图拉
Owner TEXAS INSTR INC