Wireless Power Receiver Control Circuit for Standard Identification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless power receivers face challenges in automatically determining the standard compliance of power transmitters without communication, as different standards use distinct frequencies and modulation techniques, leading to communication failures until protocols are established.
Innovation Solution
A control circuit in the wireless power receiver that includes a frequency detecting part, a modulation detecting part, and a standard determining part, which measures signal frequencies and detects FSK modulation to automatically identify the standard by setting specific detection periods and threshold frequencies, allowing the receiver to determine the standard based on detected frequencies and FSK presence or absence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the power receiver uses communication protocols to determine standard compliance, then accurate standard identification can be achieved, but communication failures occur until protocols are established
Solution Approach 1:
The patent applies preliminary action by performing frequency detection and FSK modulation detection before establishing communication protocols. The receiver detects the transmitter's operating frequency and checks for FSK modulation in advance, allowing it to identify the wireless power standard (PMA-1, PMA-3, PMA-4, or Qi) before attempting protocol-based communication. This preliminary standard identification ensures that subsequent communication uses the correct protocol, preventing communication failures.
2Reliability
If the power receiver automatically determines the standard without communication, then communication failures are avoided, but determination accuracy may be insufficient without protocol exchange
Solution Approach 1:
The patent employs feedback by using the results of frequency detection and FSK modulation detection to accurately determine the wireless power standard. The system detects the operating frequency, checks for FSK modulation presence, and uses this feedback information to identify whether the transmitter complies with PMA-1, PMA-3, PMA-4, or Qi standards. This feedback-based determination method achieves high accuracy without requiring preliminary communication protocol exchange.
3Adaptability or versatility
If multiple standards are supported, then versatility is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by detecting variations in frequency and modulation type to identify different wireless power standards. Instead of implementing separate communication protocols for each standard, the system changes its detection parameters (frequency range, modulation detection) based on the identified standard. This allows the receiver to support multiple standards (PMA-1, PMA-3, PMA-4, Qi) while maintaining relatively simple circuitry, as the same hardware detects different parameters to identify and adapt to various standards.
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
Enables the wireless power receiver to accurately and automatically determine the standard compliance of the power transmitter, preventing erroneous determinations and ensuring seamless power transfer across different standards.
Implementation Method 1
The reception coil 302 receives the power signal S2 of the transmission coil 202
Implementation Method 2
The rectification circuit 304/the smoothing capacitor 306 rectifies/smooths a current IRX induced in the reception coil 302 to convert the current IRX to a DC voltage VRECT
Implementation Method 3
The control signal S3 is transmitted from the reception coil 302 (secondary coil) to the transmission coil 202 in the form of an FSK (Frequency Shift Keying) or ASK (Amplitude Shift Keying) signal by using backscatter modulation
Data Source
AI summary
A control circuit of a wireless power receiver where the wireless power receiver includes a reception coil, a rectification circuit that rectifies a current of the reception coil, and a smoothing capacitor connected to an output of the rectification circuit. The control circuit includes a frequency detecting part configured to determine a frequency of a signal received by the reception coil in a detection period after a lapse of predetermined first time from a predetermined start timing before a lapse of predetermined second time; a modulation detecting part configured to determine whether the signal received by the reception coil is subjected to FSK (Frequency Shift Keying); and a standard determining part configured to determine a standard that a wireless power transmitter complies with, depending on the frequency detected by the frequency detecting part and the presence or absence of FSK.