Resonance Contactless Power Supply Phase Control
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Solution Overview
Problem
Existing contactless power supply devices face inefficiencies in energy transmission due to passive impedance matching loops, which can result in large and heavy devices with poor controllability and reduced energy transmission efficiency across a wide frequency range.
Innovation Solution
A resonance contactless power supply device incorporating a converter, inverter, and control circuit that generates an AC voltage with a leakage inductance resonance frequency, using a control circuit to maintain a predetermined phase difference between the AC voltage and current, thereby optimizing energy transmission efficiency through impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If passive impedance matching loops are used in contactless power supply devices, then the devices can transmit energy across a wide frequency range, but the devices become large and heavy with poor controllability and reduced energy transmission efficiency
Solution Approach 1:
The patent changes the operating parameters by using active impedance matching that dynamically adjusts the phase difference between voltage and current. The control circuit modifies the DC voltage input to the inverter to maintain a predetermined phase difference (e.g., 90 degrees), thereby optimizing energy transmission efficiency across different frequencies without requiring large passive matching loops.
2Adaptability or versatility
If passive impedance matching loops are used in contactless power supply devices, then the devices can operate across a wide frequency range, but the devices become large and heavy
Solution Approach 1:
The patent replaces the mechanical/passive impedance matching loop with an active control system. Instead of using physical inductors and capacitors to match impedance across frequencies, the system uses a control circuit that electronically adjusts the inverter's input voltage to maintain optimal phase relationships, thereby achieving frequency adaptability without heavy passive components.
3Productivity
If passive impedance matching loops are used in contactless power supply devices, then the devices can transmit energy, but the devices have poor controllability
Solution Approach 1:
The patent implements feedback control by monitoring the phase difference between the inverter's output voltage and current, and adjusting the DC voltage input accordingly. The control circuit continuously regulates the inverter's operation to maintain a predetermined phase difference, providing excellent controllability and ensuring optimal energy transmission conditions are maintained dynamically.
4Loss of energy
If active control is used to maintain phase difference, then energy transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The control circuit is designed to perform multiple functions: it monitors the inverter's output voltage and current, calculates the phase difference, adjusts the DC voltage input to maintain optimal phase relationship, and ensures efficient energy transmission. This multi-functional approach consolidates control tasks into a single integrated circuit, reducing overall system complexity despite the active control requirements.
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 enhances energy transmission efficiency by maintaining a predetermined phase difference, reducing electromagnetic interference, and improving power factor, while allowing for a compact and controllable design.
Implementation Method 1
an inverter configured to receive the adjustable DC voltage, and to generate an AC voltage with a leakage inductance resonance frequency
Implementation Method 2
Energy can be transmitted from an electric energy transmitter to an electric energy receiver in accordance with magnetic coupling characteristics of the transmitting and receiving coils of the transformer
Data Source
AI summary
A resonance contactless power supply device can include: (i) a converter configured to convert an input power signal to an adjustable DC voltage; (ii) an inverter configured to receive the adjustable DC voltage, and to generate an AC voltage with a leakage inductance resonance frequency; (iii) a first resonance circuit having a transmitting coil, and being configured to receive the AC voltage from the inverter; (iv) a second resonance circuit comprising a receiving coil that is contactlessly coupled to the transmitting coil, where the second resonance circuit is configured to receive electric energy from the transmitting coil; and (v) a control circuit configured to control the adjustable DC voltage according to a phase difference between the AC voltage and an AC current output by the inverter, such that the phase difference is maintained as a predetermined angle.