Charge-Blocking WPT Circuit for Zero-Current Resonance Tracking
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Solution Overview
Problem
Conventional wireless power transfer systems require complex auxiliary circuits and measurement controls for resonance frequency tracking, leading to increased costs, reduced real-time performance, and decreased robustness due to variable resonance states.
Innovation Solution
A wireless power transfer system employing zero current switching (ZCS) operation under charge-blocking oscillation, utilizing a transmitter terminal with a resonance capacitor and coil, and a control switch to manage energy transfer through charge-blocking oscillation, eliminating the need for external drive signals and additional circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional external drive signal control is used for resonance frequency tracking, then the operating frequency can be controlled, but the system requires a large count of auxiliary circuits and measurement controls, increasing device complexity and cost
Solution Approach 1:
The system uses self-oscillating operation where the WPT system generates its own oscillation based on resonance parameters, eliminating the need for external drive signals and complex auxiliary circuits. The system automatically tracks resonance frequency through intrinsic oscillation characteristics, reducing device complexity while maintaining tracking reliability
Solution Approach 2:
The invention extracts and removes the external drive signal control mechanism and associated auxiliary circuits from the system. By using natural resonance oscillation, the system eliminates complex measurement and control circuits, achieving simpler device architecture with improved robustness
2Productivity
If conventional external drive signal control is used, then frequency control is possible, but real-time tracking performance deteriorates due to complex control requirements
Solution Approach 1:
The self-oscillating system automatically adjusts its frequency based on resonance conditions without requiring complex real-time control circuits. The intrinsic oscillation mechanism provides natural real-time tracking performance by responding directly to changes in resonance parameters, eliminating the need for sophisticated control hardware
3Loss of energy
If external drive signals are used for operation, then the system can maintain stable operation, but switching losses increase and efficiency decreases
Solution Approach 1:
The system employs periodic charge-blocking oscillation where the switch operates at zero current crossing points of the resonant oscillation. This periodic self-oscillating action ensures that switching occurs naturally when current is zero, minimizing switching losses while maintaining stable operation through the inherent periodicity of resonance
Solution Approach 2:
The system changes the operating mode from external drive signal control to self-oscillating charge-blocking operation. This parameter change in the control mechanism enables zero current switching, significantly reducing switching losses while the resonance characteristics maintain operational stability
4Measurement precision
If conventional WPT operation is used, then energy transmission can be achieved, but resonance frequency tracking accuracy is limited by complex control requirements
Solution Approach 1:
The self-oscillating system inherently tracks resonance frequency through its natural oscillation characteristics without requiring external measurement and control circuits. The oscillation frequency automatically aligns with resonance parameters, achieving high tracking accuracy through the system's intrinsic behavior rather than complex measurement hardware
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 approach achieves efficient and stable energy transmission with reduced switching losses, enhanced reliability, and improved applicability by isolating the operating frequency from drive frequency, thus optimizing energy transfer efficiency and system performance.
Implementation Method 1
the receiver coil is coupled with the transmitter coil to produce a magnetic field coupling
Implementation Method 2
The resonance is a physical phenomenon that can occur not only by an external driving but also by self-oscillating. As an energy transmission process of the WPT, the resonance may transmit the energy through the self-oscillating. The operating frequency of the self-oscillating WPT is determined by a resonance parameter and is approximately equal to the natural resonance frequency
Data Source
AI summary
The present disclosure relates to a field of wireless power transfer technology. The present disclosure relates to a wireless power transfer system for zero current switching (ZCS) operation under charge-blocking oscillation, comprising a power supply, a transmitter terminal, and a receiver terminal, the transmitter terminal having a resonance capacitor and a transmitter coil, the receiver terminal having a receiver coil. The transmitter terminal further comprises: an equivalent resistor, the equivalent resistor being connected in series with the transmitter coil and then in parallel with the resonance capacitor to form a charge-blocking oscillation circuit; a control switch, the control switch being connected with both terminals of the power supply after being connected in series with the charge-blocking oscillation circuit A self-oscillating is achieved by utilizing charge-blocking. By blocking the resonant cavity after charging, an energy is closed inside the closed-loop resonance circuit, and the energy will oscillate. Compared with a conventional self-oscillating wireless power transfer (WPT) based on a negative resistor, some improvements in the present disclosure have a fewer count of switching devices and do not require any additional circuit design, thus having a better cost and robustness.