Parallel Resonant Rectifier Circuit Impedance Matching
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Solution Overview
Problem
Existing wireless power transceiving systems face inefficiencies due to increased impedance from parasitic inductance in rectifier circuits operating at high frequencies, leading to poor rectification of AC input voltage and burden on DC/DC converters, especially when load conditions change.
Innovation Solution
A power receiving apparatus with a parallel resonant rectifier circuit and adjustable capacitive elements that match impedance generated by parasitic components, ensuring consistent output voltage across varying loads by adjusting capacitance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a full wave rectifier is used to rectify wirelessly transmitted power in a wireless power transmission method, then power supply without using an electric wire is achieved, but transmission efficiency deteriorates due to increased impedance from parasitic inductance at high frequency
Solution Approach 1:
The patent changes the operating parameters of the rectifier circuit by introducing a resonant frequency matching mechanism. The rectifier circuit is designed to operate at a specific resonant frequency where the impedance caused by parasitic inductance is minimized. By tuning the circuit parameters (capacitance and inductance values) to achieve resonance at the operating frequency, the patent reduces the harmful impedance effects and improves transmission efficiency while maintaining wireless power supply functionality
Solution Approach 2:
The patent converts the harmful effect of parasitic inductance into a beneficial resonant effect. By deliberately designing the rectifier circuit with resonant characteristics that match the wireless power transmission frequency, the parasitic inductance becomes part of the resonant system rather than a harmful component. This resonance condition minimizes impedance and maximizes power transfer efficiency, turning what was previously a detrimental factor into an advantageous feature
2Ease of operation
If electromagnetic resonance is used for wireless power transmission, then wireless power supply is enabled, but circuit efficiency remains low due to impedance increase from parasitic components at MHz operating frequency
Solution Approach 1:
The patent optimizes the circuit parameters by designing the rectifier circuit with specific capacitance and inductance values that create a resonant frequency matching the electromagnetic resonance transmission frequency. This parameter optimization ensures that the circuit operates at peak efficiency by minimizing the impedance effects of parasitic components at the MHz operating frequency
Solution Approach 2:
The patent transforms the harmful parasitic components into beneficial resonant elements. By designing the circuit so that the parasitic inductance and capacitance form a resonant system at the operating frequency, the patent converts the previously harmful impedance into a useful resonant effect that enhances power transfer efficiency while maintaining electromagnetic resonance wireless power transmission
3Speed
If a related art rectifier circuit operates at high frequency, then wireless power transmission is enabled, but rectification performance deteriorates due to increased impedance from parasitic inductance
Solution Approach 1:
The patent modifies the rectifier circuit parameters to operate optimally at high frequency by introducing resonant frequency matching. The circuit is designed with specific L and C values that create resonance at the high operating frequency, which minimizes the impedance effects of parasitic inductance and maintains reliable rectification performance despite the high-speed operation
Solution Approach 2:
The patent converts the harmful high-frequency parasitic inductance into a beneficial resonant effect. By tuning the circuit to resonate at the operating frequency, the parasitic inductance becomes a useful component of the resonant system rather than a harmful impedance, thereby maintaining reliable rectification performance at high operating frequencies
4Adaptability or versatility
If load connected to rectifier circuit output changes from maximum to minimum, then power adaptability is improved, but output voltage becomes inconsistent and DC/DC converter burden increases
Solution Approach 1:
The patent implements a feedback mechanism where the rectifier circuit continuously monitors the load conditions and adjusts its operating parameters accordingly. By detecting changes in load impedance and adjusting the resonant frequency or other circuit parameters in real-time, the patent maintains consistent output voltage across varying load conditions while improving load adaptability
Solution Approach 2:
The patent introduces dynamic adjustment capabilities to the rectifier circuit, allowing it to adapt its parameters in response to changing load conditions. This dynamic behavior enables the circuit to maintain optimal performance and consistent output voltage across a wide range of load conditions, transforming a static circuit into an adaptive system
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
Enhances power transmission efficiency by mitigating impedance issues and maintaining consistent output voltage despite changes in load conditions, thereby improving overall system performance.
Implementation Method 1
a reception resonator which receives the transmitted resonance wave
Implementation Method 2
transforms the received resonance wave into direct current power
Implementation Method 3
a parallel resonant rectifier circuit which converts the received resonance wave into direct current power
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A wireless power transceiving system (Fig. 4) includes a power transmitting apparatus (100) which converts power into a resonance wave and transmits the resonance wave, and a power receiving apparatus (200) which receives the transmitted resonance wave, and converts the resonance wave into DC power using a parallel resonant rectifier circuit (220) that is impedance matched with impedance generated in the power receiving apparatus by parasitic components at a frequency of the resonance wave.