Wireless Power Receiver Collision Avoidance via Signal Modulation
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in enabling multiple wireless power receivers to communicate effectively with a wireless power transmitter to control power transfer without collisions, as they often receive the same wireless power signal and lack efficient methods to transmit control messages without interfering with each other.
Innovation Solution
A method and system where wireless power receivers can demodulate, decode, and modulate wireless power signals to transmit control messages, determining if a second packet is transmittable based on the transmission period and length of the first packet, and adjusting the modulation to include the second packet or indicate non-transmittability, while using a controller to manage the process and ensure no collision occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple wireless power receivers receive the same wireless power signal simultaneously, then power transfer efficiency is improved, but communication collision occurs between receivers
Solution Approach 1:
The patent segments the communication process by dividing receivers into different groups based on their power consumption characteristics. Each group is assigned specific time slots for communication, preventing simultaneous transmissions that would cause collisions. This segmentation allows multiple receivers to share the same wireless power signal while maintaining reliable communication through temporal separation.
2Adaptability or versatility
If wireless power receivers transmit control messages using the wireless power signal, then communication capability is improved, but signal collision occurs between multiple receivers
Solution Approach 1:
The patent implements periodic action by assigning different time slots to different receivers for transmitting control messages. Each receiver transmits its control message only during its designated time slot, creating a periodic communication pattern. This approach enables full communication capability for all receivers while eliminating signal collisions through temporal separation of transmissions.
3Adaptability or versatility
If a wireless power transmitter transfers power to multiple receivers, then power distribution versatility is improved, but communication management complexity increases
Solution Approach 1:
The patent applies local quality by assigning different communication parameters (time slots, frequency channels, or code sequences) to different receivers based on their individual characteristics and power consumption patterns. This localized differentiation allows the transmitter to manage multiple receivers efficiently without requiring complex centralized coordination, as each receiver operates with its own optimized communication parameters.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows multiple wireless power receivers to transmit control messages to the transmitter using the received wireless power signal, enabling controlled power management and preventing collisions, thus effectively managing power transfer among multiple receivers.
Implementation Method 1
receive a wireless power signal generated by a power transmitter
Implementation Method 2
a demodulation unit configured to demodulate the received wireless power signal
Implementation Method 3
a modulation unit configured to modulate the received wireless power signal
Data Source
Figure 1~2(b)
Figure 3
Figure 4(a)~4(b)
AI summary
The present specification discloses as one embodiment a power receiver for transmitting a message by using a power transmission signal. The power receiver comprises: a power reception portion for receiving the wireless power signal that is formed by a power transmitter; a demodulation portion for demodulating the received wireless power signal; a modulation portion for modulating the received wireless power signal; and a control portion for decoding a first packet from the wireless power signal that is demodulated by means of the demodulation portion, for determining whether a second packet that does not collide with the first packet which has been decoded can be transmitted, and for modulating the received wireless power signal so as to comprise the second packet by controlling the modulation portion, when transmission is possible according to the result of the determination.