Dual Voltage-Current Decoding Circuit for Wireless Power Stability
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Solution Overview
Problem
Existing wireless charging technologies face decoding errors due to heavy or light loads and coil position offsets, leading to inconsistent charging states and disconnections in mobile devices, as they rely solely on voltage decoding which fails under heavy loads or light loads.
Innovation Solution
A circuit for signal decoding in RFID or wireless power charging that incorporates both voltage and current decoding using an upper and lower switch, an L-C resonant circuit, voltage decoding circuit, current decoding circuit, and control circuit, which includes peak detectors, current sensing resistors, amplifiers, and comparators to provide feedback data for accurate decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If voltage decoding is used in wireless charging, then decoding simplicity is maintained, but decoding accuracy deteriorates under heavy loads or light loads
Solution Approach 1:
The decoding function is segmented into two independent decoding circuits: a voltage decoding circuit and a current decoding circuit. Each circuit handles decoding independently, allowing the system to select the appropriate decoding result based on load conditions, thereby maintaining decoding accuracy across different operating scenarios without significantly increasing overall system complexity.
Solution Approach 2:
The system changes the decoding parameter dynamically by switching between voltage-based decoding and current-based decoding depending on load conditions. Under heavy loads, current decoding is used; under light loads, voltage decoding is used. This parameter change approach ensures accurate decoding across different operating conditions while keeping each individual decoding circuit relatively simple.
2Measurement precision
If dual voltage and current decoding is implemented, then decoding accuracy under various loads is improved, but device complexity increases
Solution Approach 1:
The decoding function is segmented into two independent decoding circuits: a voltage decoding circuit and a current decoding circuit. Each circuit handles decoding independently, allowing the system to select the appropriate decoding result based on load conditions, thereby maintaining decoding accuracy across different operating scenarios without significantly increasing overall system complexity.
Solution Approach 2:
The system implements feedback mechanisms where the control unit monitors load conditions and selectively accepts decoding results from either the voltage decoding circuit or the current decoding circuit. This feedback-based selection ensures that only accurate decoding results are used, improving overall system reliability while managing complexity through intelligent control.
3Device complexity
If only voltage decoding is used, then circuit simplicity is maintained, but charging stability deteriorates under heavy loads
Solution Approach 1:
The decoding function is segmented into two independent decoding circuits: a voltage decoding circuit and a current decoding circuit. Each circuit handles decoding independently, allowing the system to select the appropriate decoding result based on load conditions, thereby maintaining decoding accuracy across different operating scenarios without significantly increasing overall system complexity.
Solution Approach 2:
The system changes the decoding parameter dynamically by switching between voltage-based decoding and current-based decoding depending on load conditions. Under heavy loads, current decoding is used; under light loads, voltage decoding is used. This parameter change approach ensures accurate decoding across different operating conditions while keeping each individual decoding circuit relatively simple.
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
The solution ensures successful decoding regardless of load conditions, preventing disconnections and maintaining stable charging by using both voltage and current feedback, thus improving the reliability of wireless charging systems.
Implementation Method 1
an L-C resonant circuit, a voltage decoding circuit coupled to the resonant decoding terminal of the L-C resonant circuit
Implementation Method 2
When the coil L101 of the receiver receives a transmitted magnetic power, after a rectifying process
Data Source
AI summary
A circuit for signal decoding in RFID or wireless power charging is provided in the present invention. The implement of the present invention is to add a current sense resistor connected to an upper switch or a lower switch the up arm switch or low arm switch to decode the signal on the current sense resistor. Since the error would occur in the original voltage decoder of the wireless power or RFID when the load is heavy and voltage signal swing is large, such that the charge status and then the off-line status cyclically occur and then the charge status . . . occurs in cycle when the mobile device is charging under charge. Since the present invention uses the voltage and current for decoding at the same time, the decoding would be succeed whenever the load is light or heavy.