Wireless Power Feeder Frequency Synchronization Circuit
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Solution Overview
Problem
Existing wireless power transmission systems face efficiency declines due to component complexity and positional deviations between power feed and receive coils, leading to increased component counts and complicated control systems.
Innovation Solution
A wireless power feeder system with a simplified control circuit comprising a phase delay circuit, magnetic sensor, and AC current generation circuit that adjusts the frequency of the AC current in the power feed coil to match the frequency of the AC current in the power receive coil, ensuring efficient power transmission even with coil misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If voltage detection circuit, current detection circuit, and multiplication circuit are used to detect input power and find maximum oscillation frequency, then power transmission efficiency is improved, but the number of components increases and control circuit becomes complicated
Solution Approach 1:
The patent extracts only the essential function needed for frequency control by removing unnecessary detection circuits. Instead of using voltage detection circuit, current detection circuit, and multiplication circuit to calculate input power, the invention directly detects the frequency of the power receive coil and uses this information to control the oscillation frequency of the power feed coil, achieving efficient power transmission with a simplified control circuit.
Solution Approach 2:
The system uses the power receive coil itself to generate the frequency reference signal. The power receive coil's resonant frequency automatically serves as the control reference for the power feed coil's oscillation frequency, eliminating the need for external detection circuits and complex control logic.
2Measurement precision
If peak hold circuits and multiplication circuit are added to detect maximum input power, then oscillation frequency accuracy is improved, but device complexity increases
Solution Approach 1:
The patent removes peak hold circuits and multiplication circuit from the system. Instead of detecting input power and calculating maximum oscillation frequency through complex circuits, the invention directly uses the power receive coil's resonant frequency as the reference, achieving accurate frequency control with minimal components.
3Loss of energy
If frequency of AC current in power feed coil is not synchronized with power receive coil, then power transmission efficiency declines due to mutual inductance changes, but adding complex control circuit to synchronize frequencies increases device complexity
Solution Approach 1:
The patent implements a feedback mechanism where the frequency detection circuit detects the resonant frequency of the power receive coil, and this detected frequency is fed back to control the oscillation frequency of the power feed coil. This ensures continuous frequency synchronization and maintains high power transmission efficiency without requiring complex control circuits.
Solution Approach 2:
The control circuit serves multiple functions: it detects the resonant frequency of the power receive coil, generates the oscillation signal for the power feed coil, and adjusts the frequency based on feedback. This multi-functionality eliminates the need for separate detection and control circuits, reducing overall system complexity.
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 system achieves efficient power transmission by synchronizing the frequency of the AC current in the power feed coil with the power receive coil, maintaining high efficiency despite deviations in coil distance and position, without the need for a complex control circuit.
Implementation Method 1
power transmission by a non-contact method from a primary side coil (power feed coil) to a secondary side coil (power receive coil) using an electromagnetic induction
Implementation Method 2
a magnetic sensor which is biased by the delayed AC voltage and detects a magnetic field generated by the power receive coil
Implementation Method 3
a phase delay circuit which generates a delayed AC voltage in which the phase of an output AC voltage is delayed
Implementation Method 4
control circuit which performs power feed from the power feed coil to the power receive coil on the basis of magnetic coupling between the power feed coil and the power receive coil
Data Source
AI summary
A wireless power feeder which performs power feed by a non-contact method to a wireless power receiver having a power receive coil, this wireless power feeder having a power feed coil; and a control circuit having a phase delay device which generates a delayed AC voltage where the phase of the output AC voltage is delayed; a magnetic sensor biased by the delayed AC voltage and detects a magnetic field generated by power receive coil; phase detection circuits which generate phase difference instruction voltages corresponding to a phase difference between an output voltage from the magnetic sensor and a comparison voltage, on the basis of the output voltage and the comparison voltage; and AC current generation circuits which generate the output AC voltage having a frequency based on the phase difference instruction voltage, and generate the AC current having a frequency corresponding to the frequency of the output AC voltage.