High-Frequency Rectifier Circuit Resonant Switching
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Solution Overview
Problem
Conventional bridge rectifier circuits experience increased switching loss and decreased power conversion efficiency at high frequencies above MHz, leading to heat energy generation and reduced component lifespan, necessitating additional cooling measures and increased costs.
Innovation Solution
A rectifying circuit for high-frequency power supply that incorporates a bridge rectifier circuit with a matching functional circuit and a smoothing functional circuit, enabling partial resonant switching to reduce switching loss and achieve high power conversion efficiency by matching the resonance condition of the reception antenna and smoothing the rectified voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional bridge rectifier circuit is used at high frequency, then the rectification function is achieved, but the switching loss of diodes increases and power conversion efficiency decreases
Solution Approach 1:
The patent changes the operating parameters of the rectifier circuit by introducing resonance conditions. The matching circuit adjusts the resonant frequency to match the operating frequency, transforming the rectifier operation from non-resonant to resonant state. This parameter change enables partial resonant switching that reduces switching loss and improves power conversion efficiency to 90% or more
Solution Approach 2:
The patent utilizes electromagnetic resonance (analogous to mechanical vibration principles) to reduce switching losses. By matching the resonant frequency of the LC circuit with the operating frequency, the circuit achieves resonant switching conditions where the reactive components naturally oscillate, reducing the energy loss during switching transitions of the diodes
2Reliability
If conventional rectifier circuit is used, then rectification is achieved, but heat energy is generated causing temperature rise and reduced component lifespan
Solution Approach 1:
The patent converts the harmful heat energy that would normally be lost during rectification into useful resonant energy. By operating in resonant mode, the energy that would be dissipated as heat is instead stored and reused in the resonant oscillation of the LC circuit, significantly reducing temperature rise and extending component lifespan
3Device complexity
If conventional rectifier circuit is used, then rectification function is provided, but additional cooling measures are needed increasing cost and device size
Solution Approach 1:
The patent merges the matching circuit and smoothing circuit functions directly into the rectifier circuit operation. The matching functional circuit and smoothing functional circuit are integrated with the bridge rectifier, eliminating the need for separate cooling systems. This consolidation achieves both high power conversion efficiency (90% or more) and simplified device configuration
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 proposed solution achieves high power conversion efficiency of 90% or more, reducing heat generation and extending component lifespan, while eliminating the need for additional cooling measures and minimizing circuit size, weight, and cost.
Implementation Method 1
a matching functional circuit that matches a resonance condition to that of the reception antenna for power transmission
Implementation Method 2
a smoothing functional circuit that smooths the voltage rectified by the bridge rectifier circuit into a direct voltage
Data Source
AI summary
A rectifying circuit for high-frequency power supply that rectifies an alternating voltage at a high frequency exceeding 2 MHz, the rectifying circuit for high-frequency power supply including a bridge rectifier circuit that rectifies the alternating voltage inputted from a reception antenna for power transmission, a matching functional circuit that matches a resonance condition to that of the reception antenna for power transmission, and a smoothing functional circuit that smooths the voltage rectified by the bridge rectifier circuit into a direct voltage, in which the rectifying circuit for high-frequency power supply causes the bridge rectifier circuit to perform partial resonant switching in a switching operation at the time of rectification by using the matching functional circuit and the smoothing functional circuit.