Device detection using harmonics
First Claim
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1. An apparatus comprising:
- a wireless-power-providing (WPP) circuit configured to provide wireless power to a WPP-compliant wireless device, the wireless-power-providing circuit including;
a transmitter circuit configured to;
generate, in a wireless-power-providing mode, a first radio frequency (RF) signal at a first frequency, the first RF signal inductively coupling the transmitter circuit to the compliant wireless device; and
generate a second RF signal at a second frequency;
a detection circuit configured to detect a presence of a WPP-noncompliant wireless device, the detection circuit including;
a receiver circuit configured to detect a third RF signal at a third frequency that is a harmonic of the second frequency; and
a control circuit configured to;
control, for the wireless-power-providing mode, the generation each of the first RF signal and the second RF signal by the transmitter circuit; and
reduce, in response to detecting the third RF signal, a signal strength for the first RF signal;
wherein the control circuit is further configured to cause the transmitter circuit to generate the second RF signal for a burst having a duration that is set based upon a setup time for generation of the third RF signal by the noncompliant wireless device and a hold time for the detection circuit to detect the third RF signal.
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Abstract
Wireless power is provided to a WPP-compliant wireless device by generating a first radio frequency (RF) signal at a first frequency. The transmitter circuit is inductively coupled to the compliant wireless device using the first RF signal. A second RF signal is generated at a second frequency. The presence of a WPP-noncompliant wireless device is detected by detecting a third RF signal at a third frequency that is a harmonic of the second frequency. The non-compliant wireless device is protected by reducing, in response to detecting the third RF signal, a signal strength for the first RF signal.
10 Citations
16 Claims
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1. An apparatus comprising:
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a wireless-power-providing (WPP) circuit configured to provide wireless power to a WPP-compliant wireless device, the wireless-power-providing circuit including; a transmitter circuit configured to; generate, in a wireless-power-providing mode, a first radio frequency (RF) signal at a first frequency, the first RF signal inductively coupling the transmitter circuit to the compliant wireless device; and generate a second RF signal at a second frequency; a detection circuit configured to detect a presence of a WPP-noncompliant wireless device, the detection circuit including; a receiver circuit configured to detect a third RF signal at a third frequency that is a harmonic of the second frequency; and a control circuit configured to; control, for the wireless-power-providing mode, the generation each of the first RF signal and the second RF signal by the transmitter circuit; and reduce, in response to detecting the third RF signal, a signal strength for the first RF signal; wherein the control circuit is further configured to cause the transmitter circuit to generate the second RF signal for a burst having a duration that is set based upon a setup time for generation of the third RF signal by the noncompliant wireless device and a hold time for the detection circuit to detect the third RF signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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providing wireless power to a wireless-power-providing (WPP)-compliant wireless device by, in a WPP mode; generating, using a transmitter circuit, a first radio frequency (RF) signal at a first frequency; and inductively coupling the transmitter circuit to the compliant wireless device using the first RF signal; generating, using the transmitter circuit, a second RF signal at a second frequency; detecting, using a detection circuit, a presence of a WPP-noncompliant wireless device by detecting a third RF signal at a third frequency that is a harmonic of the second frequency; and protecting, using a control circuit, the noncompliant wireless device by reducing, in response to detecting the third RF signal, a signal strength for the first RF signal; further comprising periodically polling for the presence of the non-compliant wireless device in response to providing wireless power to the compliant wireless device; wherein the generating the second RF signal includes generating RF bursts having a duration that is set based upon a setup time for generation of the third RF signal by the non-compliant wireless device and a hold time for detecting the third RF signal. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. An apparatus comprising:
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a wireless-power-providing (WPP) circuit configured to provide wireless power to a WPP-compliant wireless device, the wireless-power-providing circuit including; a transmitter circuit configured to; generate, in a wireless-power-providing mode, a first radio frequency (RF) signal at a first frequency, the first RF signal inductively coupling the transmitter circuit to the compliant wireless device; and generate a second RF signal at a second frequency; a detection circuit configured to detect a presence of a WPP-noncompliant wireless device, the detection circuit including; a receiver circuit configured to detect a third RF signal at a third frequency that is a harmonic of the second frequency; and a control circuit configured to; control, for the wireless-power-providing mode, the generation each of the first RF signal and the second RF signal by the transmitter circuit and reduce, in response to detecting the third RF signal, a signal strength for the first RF signal; wherein the detection circuit is further configured to detect an absence of the non-compliant wireless device by detecting an absence of the third RF signal; and wherein the control circuit is further configured to increase, in response to detecting the absence of the third RF signal, the signal strength for the first RF signal.
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Specification