Wireless power transfer in-band communication system
First Claim
1. A wireless charging in-band communication system, the wireless charging in-band communication system being used for performing communication between a load device and a source device, the wireless charging in-band communication system comprising:
- a transmitter module that is positioned within the load device and formats a message using CRC calculation and attaches the results of the CRC calculation to the message for message error detection, the transmitter module includes a channel encoding module for message error correction, and a modulation module that performs biphase modulation for DC balanced signals and impedance switching to change reflected impedance seen by the source device, and a synchronization module that prepends the message with a synchronization sequence having Golay complementary codes; and
a receiver module that is positioned within the source device and receives the message from the transmitter module, the receiver module includes an impedance sensing circuit to detect changes in the reflected impedance of the transmitter module, the receiver module includes a front end filter used for pulse shaping and noise rejection, a preamble detection block having a Golay complementary code correlator used for message detection, synchronization, and equalization coefficient estimation and selection, and a decoding module that performs biphase demodulation with error correction with a DC offset being estimated as the average value of the signal over the length of the message before channel decoding, the decoding module performs equalization, error correction channel decoding, and error detection (CRC);
wherein the message is transmitted outward by the transmitter module through changing the reflected impedance, and the message transmitted by the transmitter module is a message corresponding to usage related to power transfer, so as to affect power transfer control of the source device; and
the synchronization module provides a gap between the preamble and message, for timing adjustments in the receiver module.
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Accused Products
Abstract
A wireless charging in-band communication system includes a transmitter module that formats a message using CRC calculation and attaches the results of the CRC calculation to the message for message error detection. The transmitter includes channel encoding for message error correction. A modulation module performs biphase modulation for DC balanced signals and impedance switching to change reflected impedance seen by the source. A synchronization module prepending the message with a synchronization sequence having Golay complementary codes. Moreover, the in-band communication includes a receiver module that receives the message from the transmitter module. The receiver module includes an impedance sensing circuit to detect changes in the reflected impedance of the transmitter module. The receiver module includes a front end filter used for pulse shaping and noise rejection. A preamble detection block includes a Golay complementary code correlator used for message detection, synchronization, and equalization coefficient estimation and selection. A decoding module performs biphase demodulation with error correction with a DC offset being estimated as the average value of the signal over the length of the message before channel decoding Also, the decoding module performs equalization, error correction channel decoding,and error detection (CRC).
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Citations
55 Claims
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1. A wireless charging in-band communication system, the wireless charging in-band communication system being used for performing communication between a load device and a source device, the wireless charging in-band communication system comprising:
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a transmitter module that is positioned within the load device and formats a message using CRC calculation and attaches the results of the CRC calculation to the message for message error detection, the transmitter module includes a channel encoding module for message error correction, and a modulation module that performs biphase modulation for DC balanced signals and impedance switching to change reflected impedance seen by the source device, and a synchronization module that prepends the message with a synchronization sequence having Golay complementary codes; and a receiver module that is positioned within the source device and receives the message from the transmitter module, the receiver module includes an impedance sensing circuit to detect changes in the reflected impedance of the transmitter module, the receiver module includes a front end filter used for pulse shaping and noise rejection, a preamble detection block having a Golay complementary code correlator used for message detection, synchronization, and equalization coefficient estimation and selection, and a decoding module that performs biphase demodulation with error correction with a DC offset being estimated as the average value of the signal over the length of the message before channel decoding, the decoding module performs equalization, error correction channel decoding, and error detection (CRC); wherein the message is transmitted outward by the transmitter module through changing the reflected impedance, and the message transmitted by the transmitter module is a message corresponding to usage related to power transfer, so as to affect power transfer control of the source device; and the synchronization module provides a gap between the preamble and message, for timing adjustments in the receiver module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of performing the operations of a wireless charging in-band communication system, the wireless charging in-band communication system being used for performing communication between a load device and a source device, the method comprising:
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formatting a message using CRC calculation and attaching the results of the CRC calculation to the message for message error detection; performing biphase modulation for DC balanced signals using a modulation module of a transmitter module, including impedance switching to change reflected impedance seen by the source device, wherein the transmitter module is positioned within the load device; prepending the message with a synchronization sequence having Golay complementary codes using a synchronization module; receiving the message from the transmitter module using a receiver module, wherein the receiver module is positioned within the source device; providing an impedance sensing circuit to detect changes in the reflected impedance of the transmitter module; providing a front end filter used for pulse shaping and noise rejection; using a Golay complementary code correlator for message detection, synchronization, and equalization coefficient estimation and selection; performing biphase demodulation with error correction with a DC offset being estimated as the average value of the signal over the length of the message before channel decoding using a biphase demodulator module; and performing equalization, error correction channel decoding, and error detection (CRC); wherein the message is transmitted outward by the transmitter module through changing the reflected impedance, and the message transmitted by the transmitter module is a message corresponding to usage related to power transfer, so as to affect power transfer control of the source device; and the synchronization module provides a gap between the preamble and message, for timing adjustments in the receiver module. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A transmitter module, used in a wireless charging system, for performing in-band communication with a receiver module in the wireless charging system to provide a message to the receiver module, the transmitter module comprising:
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a check module, arranged for attaching check calculation results of the message to the message to generate an attached result, for message error detection; an encoding module, arranged for performing channel encoding on the attached result to generate an encoded result; a modulation module, arranged for performing modulation on the encoded result, including performing impedance switching to provide the message to the receiver module by changing reflected impedance seen by the receiver module; and a synchronization module, arranged for prepending the message with a synchronization sequence having specific codes; wherein the message is transmitted outward by the transmitter module through changing the reflected impedance, and the message transmitted by the transmitter module is a message corresponding to usage related to power transfer, so as to affect power transfer control of the receiver module; and the synchronization module provides a gap between the preamble and message, for timing adjustments in the receiver module. - View Dependent Claims (30, 31, 32, 33)
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34. A receiver module, used in a wireless charging system, for performing in-band communication with a transmitter module in the wireless charging system to receive a message provided by the transmitter module, the receiver module comprising:
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an impedance sensing circuit, arranged for detecting changes in the reflected impedance of the transmitter module, wherein the message is included by the changes in the reflected impedance; a front end filter, coupled to the impedance sensing circuit, arranged for performing pulse shaping and noise rejection; a preamble detection block, coupled to the front end filter, arranged for performing message detection, synchronization, and equalization coefficient estimation; and a decoding module, coupled to the front end filter, arranged for performing equalization, decoding, and error detection; wherein the message is transmitted outward by the transmitter module through changing the reflected impedance, and the message transmitted by the transmitter module is a message corresponding to usage related to power transfer, so as to affect power transfer control of the receiver module; and wherein a synchronization module in the transmitter module prepends the message with a synchronization sequence having specific codes, and the preamble detection block adjusts timing during a gap between the preamble and message. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42)
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43. A method of performing the operations of a transmitter module in a wireless charging in-band communication system, wherein the wireless charging in-band communication system comprises the transmitter module and a receiver module, the transmitter module performs in-band communication with the receiver module to provide a message to the receiver module, and the method comprises:
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attaching check calculation results of the message to the message to generate an attached result, for message error detection; utilizing a modulation module to perform modulation according to the attached result, including performing impedance switching to provide the message to the receiver module by changing reflected impedance seen by the receiver module; and utilizing a synchronization module to prepend the message with a synchronization sequence having specific codes; wherein the message is transmitted outward by the transmitter module through changing the reflected impedance, and the message transmitted by the transmitter module is a message corresponding to usage related to power transfer, so as to affect power transfer control of the receiver module; and the synchronization module provides a gap between the preamble and message, for timing adjustments in the receiver module. - View Dependent Claims (44, 45, 46, 47)
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48. A method of performing the operations of a receiver module in a wireless charging in-band communication system, wherein the wireless charging in-band communication system comprises a transmitter module and the receiver module, the receiver module performs in-band communication with the transmitter module to receive a message provided by the receiver module, and the method comprises:
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providing an impedance sensing circuit to detect changes in the reflected impedance of the transmitter module, wherein the message is included by the changes in the reflected impedance; providing a front end filter to perform pulse shaping and noise rejection; performing message detection, synchronization, and equalization coefficient estimation, comprising adjusting timing during a gap between the preamble and message; and performing equalization, channel decoding, and error detection; wherein the message is transmitted outward by the transmitter module through changing the reflected impedance, and the message transmitted by the transmitter module is a message corresponding to usage related to power transfer, so as to affect power transfer control of the receiver module; and a synchronization module in the transmitter module prepends the message with a synchronization sequence having specific codes, and provides a gap between the preamble and message. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55)
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Specification