Wireless Power Receiver Gate Voltage Control
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Solution Overview
Problem
Existing wireless charging systems face inefficiencies due to variations in load-modulated signal strength, leading to reduced charging efficiency and potential safety issues when the signal magnitude exceeds or falls below a specific range, affecting both capacitor noise and demodulation sensitivity.
Innovation Solution
An electronic device equipped with a wireless power-receiving circuit, a rectifying circuit, and a sensing circuit, along with a processor that controls the gate voltage of Field Effect Transistors (FET) elements connected to the rectifying circuit, to maintain the magnitude of the modulated signal within a constant range, ensuring optimal load-modulation and efficient power reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the load-modulated signal strength is increased to improve demodulation sensitivity, then communication reliability improves, but capacitor noise increases and wireless charging efficiency decreases
Solution Approach 1:
The patent implements a feedback mechanism where the receiver measures the magnitude of the load-modulated signal and communicates this information back to the transmitter. The transmitter then adjusts its load modulation depth based on this feedback to maintain the signal magnitude within an optimal range, preventing both excessive noise and insufficient demodulation sensitivity.
Solution Approach 2:
The patent dynamically changes the load modulation depth parameter based on measured signal conditions. When the signal magnitude is too high, the modulation depth is reduced; when it's too low, the modulation depth is increased. This parameter adjustment resolves the contradiction by adapting the system to maintain optimal performance across varying conditions.
2Reliability
If the load-modulated signal strength is increased to improve communication reliability, then signal detection improves, but wireless charging efficiency decreases
Solution Approach 1:
The receiver measures the load-modulated signal magnitude and provides feedback to the transmitter. Based on this feedback, the transmitter adjusts its modulation depth to maintain optimal signal strength for communication while minimizing impact on power transfer efficiency.
Solution Approach 2:
The system transitions from static load modulation to dynamic load modulation where the modulation depth is continuously adjusted based on real-time signal measurements. This dynamic adaptation allows the system to maintain reliable communication without sacrificing charging efficiency under varying operating conditions.
3Object-generated harmful factors
If the load-modulated signal strength is decreased to reduce capacitor noise, then noise levels decrease, but demodulation sensitivity deteriorates
Solution Approach 1:
The system uses feedback from signal magnitude measurements to adjust modulation depth. When noise becomes excessive, the modulation depth is reduced to lower noise levels, but not so much that demodulation sensitivity is compromised. The feedback loop ensures the signal remains within an optimal range.
Solution Approach 2:
The load modulation depth parameter is dynamically changed based on measured signal conditions. The system finds and maintains an optimal balance point where the signal is strong enough for reliable demodulation but not so strong as to generate excessive capacitor noise.
4Reliability
If the load modulation depth is increased to improve signal magnitude, then communication reliability improves, but power transfer efficiency decreases
Solution Approach 1:
The receiver measures the signal magnitude resulting from load modulation and feeds this information back to the transmitter. The transmitter uses this feedback to adjust its modulation depth, ensuring reliable communication while minimizing energy loss and maintaining high power transfer efficiency.
Solution Approach 2:
Instead of applying full load modulation depth continuously, the system applies partial modulation depth adjusted to the actual signal conditions. This prevents excessive action that would waste energy while still achieving sufficient signal magnitude for reliable communication.
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 stabilizes the load-modulated signal strength, enhancing charging efficiency and reducing capacitor noise, while ensuring safe and effective power transmission by adjusting the FET resistance to maintain the signal within a predetermined range.
Implementation Method 1
a wireless coil for receiving power from an external electronic device
Implementation Method 2
a rectifying circuit for converting an electrical signal received from the external electronic device into a direct-current signal
Data Source
AI summary
Provided in various embodiments are an electronic device for receiving wireless power and an operating method of the electronic device, the electronic device comprising: a power receiving circuit including a wireless coil for receiving power from an external electronic device and a rectifying circuit for converting, into a direct current signal, an electric signal received from the external electronic device; a sensing circuit for determining a state of the electronic device by checking a signal applied to the wireless power receiving circuit by means of the external electronic device; and a processor, wherein the processor can be set so as to receive an output signal of the sensing circuit and control, on the basis of the output signal, a gate voltage of at least one field effect transistor (FET) element connected to an input terminal of the rectifying circuit. Other various embodiments are possible.