Power Transmission System With Input Power Minimization
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Solution Overview
Problem
Power transmission systems face efficiency decreases when load conditions change, particularly in mobile electronic devices, due to variable impedance, and existing solutions often require additional circuits that hinder miniaturization and thinning.
Innovation Solution
A power transmission system with a power transmission apparatus and a power receiving apparatus, where the transmission apparatus includes a resonance circuit and a power conversion circuit that adjusts output power based on detected input power, minimizing input power and eliminating the need for special circuits in the receiving apparatus, allowing efficient power transmission regardless of load changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a power receiving apparatus includes a special circuit for setting load resistance to maximize efficiency, then power transmission efficiency is improved, but the device size increases and miniaturization is inhibited
Solution Approach 1:
The patent extracts the load resistance setting function from the power receiving apparatus and relocates it to the power transmission apparatus. Specifically, the transmission-side controller detects input power to the power conversion circuit and adjusts the output power of the power conversion circuit to minimize input power, thereby maximizing transmission efficiency without requiring any special circuits in the receiving apparatus.
Solution Approach 2:
The transmission-side controller performs multiple functions: it controls the power conversion circuit to convert input voltage to output voltage, detects input power, and adjusts output power to minimize input power for efficiency optimization. This multi-functionality eliminates the need for separate efficiency optimization circuits in the receiving apparatus.
2Loss of energy
If the load resistance is set for maximum efficiency at rated power, then efficiency is optimized at rated load, but efficiency decreases when load varies from rated power
Solution Approach 1:
The patent implements dynamic adjustment of the output power of the power conversion circuit based on real-time detection of input power. The transmission-side controller continuously monitors input power and adjusts the output power to minimize input power, enabling the system to adapt to varying load conditions and maintain high efficiency across different operating points rather than being optimized only for rated power.
Solution Approach 2:
The system employs feedback control where the transmission-side controller detects input power to the power conversion circuit and uses this information to adjust the output power. This closed-loop feedback mechanism ensures that the system operates at optimal efficiency by continuously adapting to changes in load conditions.
3Power
If high power is always input to the power conversion circuit, then sufficient power is available for transmission, but loss increases and transmission efficiency decreases
Solution Approach 1:
The system performs self-optimization where the transmission-side controller automatically detects input power and adjusts output power to minimize input power requirements. This self-service mechanism ensures that the minimum necessary power is input to the power conversion circuit, reducing losses while maintaining sufficient power for transmission without requiring external optimization circuits.
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 high power transmission efficiency by minimizing input power and simplifying the power receiving apparatus, enabling miniaturization and thinning while maintaining efficient power delivery across varying load conditions.
Implementation Method 1
When electric field coupling or magnetic field coupling between a transmission-side coupling portion and a receiving-side coupling portion is provided, power is transmitted from a power transmission apparatus to a power receiving apparatus
Implementation Method 2
When electric field coupling or magnetic field coupling between a transmission-side coupling portion and a receiving-side coupling portion is provided, power is transmitted from a power transmission apparatus to a power receiving apparatus
Implementation Method 3
a receiving-side resonance circuit that is connected to a receiving-side coupling component or includes the receiving-side coupling component and is configured to resonate at the same resonance frequency as that of the transmission-side resonance circuit
Data Source
AI summary
A power transmission system is disclosed in which power is transmitted from a power transmission apparatus to a power receiving apparatus by electric field coupling between active and passive electrodes. The power transmission apparatus includes a step-up/down circuit for stepping up or down a direct voltage and an inverter circuit for converting the direct voltage into an alternating voltage that is output to the active and passive electrodes. The power transmission apparatus controls the step-up/down circuit to sweep a transformation ratio M=Vo1/Vin and detects the ratio M when an input power Pin of the step-up/down circuit is a minimum. The power transmission apparatus drives the step-up/down circuit to obtain the ratio M and perform the power transmission. As a result, there is provided a power transmission system capable of efficiently performing power transmission regardless of the change in a load in the power receiving apparatus.