Wireless Power Rectifier Circuit Series Resonance Impedance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless power transfer systems face challenges in maintaining stable voltage supply and efficiency when transferring power to multiple devices with varying resistance values, leading to increased size and heat dissipation issues in both transmitting and receiving devices.
Innovation Solution
The system employs a power transmitting device with a resonance capacitor and alternating current voltage generating circuit, and multiple power receiving devices with resonance capacitors and rectifier circuits, utilizing electromagnetic field resonance coupling to stabilize voltage and improve efficiency by configuring the rectifier circuit in series or parallel with the resonance mechanism, and adjusting coupling coefficients based on load resistance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If one power transmitting device supplies power to multiple power receiving devices with different resistance values, then the system achieves versatility in powering multiple devices, but the receiving voltage varies among devices leading to instability
Solution Approach 1:
The patent implements dynamic impedance adjustment in the power receiving devices. Each receiving device includes an impedance adjustment circuit that dynamically modifies its input impedance based on the operating conditions and load requirements. This dynamic adjustment allows each device to optimize its voltage gain and maintain stable receiving voltage despite variations in load resistance, thereby resolving the contradiction between versatility and voltage stability.
2Stability of the object's composition
If voltage converter is added to stabilize receiving voltage, then voltage stability is improved, but the size of power receiving device increases
Solution Approach 1:
The patent changes the electrical parameters (impedance) of the power receiving devices rather than adding physical voltage conversion hardware. By adjusting the impedance parameter dynamically, the system achieves voltage stabilization through parameter optimization instead of mechanical/voltage conversion components. This approach maintains voltage stability while avoiding the size increase that would result from adding voltage converters.
3Reliability
If transmitting power is increased to avoid power deficiency, then power supply reliability is improved, but the size of power transmitting device increases
Solution Approach 1:
The patent implements feedback mechanisms where power receiving devices communicate their power requirements and receiving conditions to the power transmitting device. The transmitting device uses this feedback information to dynamically adjust its transmitting power level, providing just enough power to meet the needs of connected devices without excessive over-provisioning. This feedback-based power management ensures reliable power supply while preventing unnecessary size increase of the transmitting device.
4Adaptability or versatility
If voltage conversion ratio is increased to handle excess power, then power management flexibility is improved, but heat dissipation and device size increase
Solution Approach 1:
The patent converts the potential harm of excess power reception into a beneficial situation by implementing impedance adjustment that prevents power excess in the first place. By dynamically adjusting the input impedance of power receiving devices, the system ensures that devices receive only the power they need, converting what would be a harmful excess power condition into a beneficial efficient power transfer scenario. This eliminates the need for high voltage conversion ratios and the associated heat dissipation problems.
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 configuration ensures stable voltage supply and high efficiency in wireless power transfer to multiple devices, reducing size and heat dissipation by optimizing voltage gain and coupling coefficients for each device.
Implementation Method 1
a power transmitting resonance mechanism and a power receiving resonance mechanism form an electromagnetic resonance field to wirelessly transfer power using electromagnetic field resonance coupling
Implementation Method 2
magnetic field coupling by mutual inductance
Implementation Method 3
a power receiving resonance mechanism together with the power receiving coil, and a power receiving rectifier circuit connected to the power receiving coil
Implementation Method 4
electric field coupling by mutual capacitance form electromagnetic field resonance coupling
Implementation Method 5
a power receiving rectifier circuit connected to the power receiving coil and configured to rectify the alternating-current voltage to a direct-current output voltage
Data Source
AI summary
A power receiving rectifier circuit is configured in series with a power receiving resonance mechanism. A first power receiving device has a load with a small equivalent resistance value, and the frequency response of a voltage gain thereof, which is the ratio of direct-current output to input voltage, is double-peaked. A second power receiving device has a load with a large equivalent resistance value, and a single-peaked frequency response of a voltage gain thereof. For the first power receiving device, by setting a coupling coefficient between power receiving and transmitting coils, the voltage gain is determined by the positional relationship between one of the frequencies at maximum voltage gain and the operating frequency, whereas for second power receiving device, the frequency at maximum voltage gain is determined close to the operating frequency, and the voltage gain is determined by setting a coupling coefficient between power receiving and transmitting coils.