Single-Ended Wireless Power Circuit With Auxiliary ZVS Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional wireless power supply devices face complexity and high costs due to the need for multiple devices in their configuration, particularly when changing the amount of power transmitted while maintaining a predetermined frequency range, which can lead to increased switching losses and heat generation.
Innovation Solution
A single-ended wireless power supply device with a transmission coil, a switching device, a resonance capacitor, an auxiliary switching device, and a voltage limiting capacitor, where the auxiliary switching device is connected in series with the voltage limiting capacitor to control resonance voltage, allowing zero voltage switching with reduced configuration complexity and switching losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a full bridge inverter with multiple semiconductor switching devices is used, then the wireless power supply device can supply power bidirectionally, but the configuration becomes complex and the device size increases
Solution Approach 1:
The patent extracts and removes unnecessary components from the conventional full bridge inverter configuration. By eliminating the need for multiple switching devices and complex control circuits, the invention achieves bidirectional power supply capability with a simplified single switching device configuration, directly resolving the contradiction between versatility and complexity.
Solution Approach 2:
The single switching device in the patent is designed to perform multiple functions that traditionally required separate components. The switching device operates in different modes (zero voltage switching, resonance control) to achieve both bidirectional power flow and frequency regulation, embodying the multi-functionality principle that reduces device complexity while maintaining versatility.
2Adaptability or versatility
If the amount of power to be transmitted is changed while maintaining frequency within a predetermined range, then power transmission flexibility is improved, but the switching device may be turned on when resonance voltage is not zero, causing increased switching losses
Solution Approach 1:
The patent implements dynamic control of the switching device turn-on timing based on real-time resonance voltage detection. The control system dynamically adjusts the switching instant to coincide with zero voltage points, even when power transmission levels change, thereby maintaining zero voltage switching conditions and minimizing switching losses while preserving power transmission flexibility.
Solution Approach 2:
The invention incorporates feedback mechanisms that monitor resonance voltage and use this information to control the switching device timing. This feedback loop ensures that the switching device is always turned on at the optimal moment (when resonance voltage is zero), preventing energy losses during switching transitions while allowing flexible power transmission adjustment.
3Adaptability or versatility
If a DC-DC converter is added to change the voltage supplied to the inverter, then the amount of power to be transmitted can be changed while maintaining frequency, but the configuration becomes complex and expensive
Solution Approach 1:
The patent merges the functions of voltage control and power transmission adjustment into the existing resonance circuit and switching device control. Instead of adding a separate DC-DC converter stage, the invention combines multiple functions (voltage regulation, frequency control, power adjustment) into the single switching device and resonance capacitor system, thereby achieving power variability without increasing configuration complexity or cost.
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
Enables zero voltage switching with low switching loss and flexible power transmission while simplifying the device configuration, reducing heat generation, and maintaining the frequency within a predetermined range, thus addressing the complexity and cost issues of conventional systems.
Implementation Method 1
a resonance capacitor connected in parallel to at least one of the transmission coil or the switching device
Implementation Method 2
a transmission coil and a switching device connected in series to a DC power supply
Implementation Method 3
a voltage limiting capacitor connected in parallel to the transmission coil or the switching device to limit a resonance voltage generated by the transmission coil and the resonance capacitor
Data Source
AI summary
A wireless power supply device (1) includes a first turn-on control circuit (31) to control a turn-on timing of a switching device (SW), and a second turn-on control circuit (32) to control a turn-on timing of an auxiliary switching device (SWS), and the switching device (SW) and the auxiliary switching device (SWS) are operable to perform a zero voltage switching operation.