Power Reception Device Voltage Stabilization via Capacitor Buffering
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Solution Overview
Problem
Wireless power supply systems face instability due to sudden changes in the magnetic field intensity, leading to voltage deviations that can cause unstable operation and damage to load circuits.
Innovation Solution
A power reception device with a rectifier circuit, a transistor, and a gate driver circuit that uses a capacitor to control the transistor's gate voltage, limiting the output voltage in response to sudden increases, thereby stabilizing the voltage supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless power supply is implemented using magnetic field transmission, then convenience is greatly increased, but power supply stability deteriorates due to sudden changes in magnetic field intensity
Solution Approach 1:
The patent introduces a capacitor as an intermediary element connected between the rectifier circuit output and the load circuit. This capacitor acts as a buffer that mediates between the unstable received voltage and the load circuit, absorbing voltage spikes and preventing them from directly affecting the load, thus maintaining power supply stability while preserving wireless convenience
Solution Approach 2:
The capacitor is positioned in advance between the rectifier and load circuit to provide beforehand cushioning against voltage fluctuations. By pre-establishing this energy storage element, the system is prepared to absorb sudden voltage increases before they can damage the load circuit, ensuring protective coverage is already in place when magnetic field intensity changes occur
2Power
If a large magnetic field is applied to the reception-side device, then more power is received, but voltage spikes cause unstable operation and damage to load circuits
Solution Approach 1:
The capacitor serves as a protective intermediary between the power reception circuit and the load circuit. When large magnetic fields induce voltage spikes, the capacitor absorbs these excess voltage variations before they reach the load circuit, allowing high power reception while filtering out harmful voltage fluctuations that would otherwise cause instability or damage
Solution Approach 2:
By placing the capacitor in advance in the circuit path between the rectifier and load, the system prepares a cushioning mechanism that will absorb voltage spikes before they can harm the load circuit. This beforehand protection allows the device to safely receive high power without risking damage from transient voltage increases
3Reliability
If conventional voltage limiting methods are used, then voltage can be controlled, but responsiveness to sudden voltage increases is insufficient
Solution Approach 1:
The capacitor acts as a passive intermediary that responds instantaneously to voltage changes through its inherent electrical characteristics. Unlike active control circuits that require detection and processing time, the capacitor immediately absorbs voltage spikes through its capacitance, providing both voltage control and high-speed responsiveness simultaneously
Solution Approach 2:
The patent replaces complex active voltage control mechanisms with a simple passive capacitor-based approach. This substitution eliminates the need for voltage detection, processing, and active regulation components, achieving both voltage control and instantaneous responsiveness through the capacitor's inherent ability to absorb voltage transients
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 effectively limits the output voltage with high responsiveness to sudden increases, ensuring stable operation and preventing damage to load circuits.
Implementation Method 1
Wireless power supply can be achieved by performing power transmission through the medium of a magnetic field, for example
Implementation Method 2
a capacitor having a first end connected to the drain of the transistor and a second end connected to the gate of the transistor
Data Source
AI summary
A power reception device has: a rectifier circuit that generates a direct current voltage by having applied thereto an alternating current voltage, and has first and second output terminals that output the direct current voltage; a transistor, the drain and source of which are connected to the first and second output terminals; a gate driver circuit that controls the gate voltage of the transistor according to the voltage between the first and second output terminals; and a capacitor that has a first end that is connected to the drain of the transistor and a second end that is connected to the gate of the transistor.