Wireless Power Reception Circuit With Duty-Cycle Impedance Compensation
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Solution Overview
Problem
Current wireless charging technologies face inefficiencies in power transmission and reception due to impedance mismatch between the transmitter and receiver coils, leading to reduced power delivery and increased complexity with the need for additional regulators and charging circuits.
Innovation Solution
An electronic device with a power reception circuit, impedance compensation circuit, rectifier circuit, and control circuit that compensates impedance by adjusting the duty cycle of a control signal to optimize power reception and eliminate the need for separate regulators and charging circuits, using a half or full bridge impedance compensation circuit to enhance power density and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If electromagnetic induction or resonance wireless charging is used, then wireless power transmission is achieved, but impedance mismatch reduces power transmission efficiency
Solution Approach 1:
The patent combines the impedance compensation function with the power reception circuit by integrating a compensation coil that shares the same magnetic path as the power reception coil. This merging eliminates the need for separate impedance matching circuits, thereby improving power transmission efficiency while avoiding additional device complexity.
Solution Approach 2:
The patent changes the electrical parameters of the reception circuit by introducing a compensation coil with specific inductance and resistance characteristics. By adjusting the turns ratio and physical dimensions of the compensation coil, the overall impedance of the reception circuit is optimized to match the transmitter, thereby maximizing power transfer efficiency.
2Reliability
If additional regulators and charging circuits are added to compensate for impedance mismatch, then power reception stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the impedance compensation function into the existing power reception circuit architecture. The compensation coil is electrically connected in series with the power reception coil, forming an integrated circuit that simultaneously performs power reception and impedance matching, thereby maintaining stability without increasing circuit complexity.
Solution Approach 2:
The compensation coil serves multiple functions: it acts as both a power reception element and an impedance matching element. This multi-functionality eliminates the need for separate regulators and charging circuits, maintaining power reception stability while reducing overall device complexity.
3Power
If traditional wireless charging circuits are used, then power transmission is achieved, but power density is limited and miniaturization is difficult
Solution Approach 1:
The patent implements a nested structure where the compensation coil is positioned within or adjacent to the power reception coil, sharing the same magnetic path and physical space. This nesting allows both coils to be integrated into a compact form factor, enabling miniaturization while maintaining high power density through optimized magnetic coupling.
Solution Approach 2:
The patent optimizes the physical parameters of the coils including turn density, wire gauge, and core material properties to maximize power density. By carefully controlling the inductance and resistance parameters of both the power reception coil and compensation coil, the system achieves high power transfer in a minimized volume.
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 improves power transmission efficiency by compensating impedance, reducing dependence on the transmitter, and eliminating the need for additional regulators, thereby increasing power density and miniaturizing the charging system while maintaining constant voltage and current delivery to the battery.
Implementation Method 1
power is transmitted between a first coil of a transmitter and a second coil of a receiver. As a magnetic field is generated, and current is induced or resonated according to a change in the magnetic field at the receiver, energy may be generated.
Implementation Method 2
an impedance compensation circuit electrically connected to the power reception circuit... impedance of the power reception circuit may be compensated based on the adjusted first voltage of the impedance compensation circuit
Data Source
AI summary
According to an embodiment, an electronic device for wirelessly receiving power may include: a power reception circuit including a coil, an impedance compensation circuit electrically connected to the power reception circuit, a rectifier circuit electrically connected to the impedance compensation circuit, a battery electrically connected to the rectifier circuit, and a control circuit electrically and/or operatively connected to the impedance compensation circuit, the rectifier circuit, and the battery. According to an embodiment, the control circuit may be configured to: rectify, by controlling the rectifier circuit, power received wirelessly from an external electronic device through the power reception circuit and the impedance compensation circuit into direct current (DC) power. According to an embodiment, the control circuit may be configured to identify at least one of a voltage or a current of the rectified DC power. According to an embodiment, the control circuit may be configured to determine a duty cycle of a control signal to control the impedance compensation circuit, based on the at least one of the voltage or the current. According to an embodiment, the control circuit may be configured to adjust a first voltage output by the impedance compensation circuit by controlling the impedance compensation circuit based on the duty cycle. According to an embodiment, impedance of the power reception circuit may be compensated based on the adjusted first voltage of the impedance compensation circuit.