Rectifier Impedance Changer Prevents Reverse Voltage Breakdown
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rectifying devices for converting high-frequency power to direct current power face reliability issues due to excessive reverse voltage applied to the rectifying element, which can lead to device breakdown, especially when power density fluctuations occur.
Innovation Solution
A rectifying device incorporating a rectifier and an impedance changer, where the impedance changer's impedance varies inversely with the absolute value of direct current power, effectively acting as a short circuit when the voltage exceeds the rectifying element's reverse withstand voltage, preventing excessive reverse voltage from being applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reverse voltage of the constant voltage diode is set to the same value as the reverse withstand voltage of the rectifying element, then the voltage suppression function is maximized, but the rectifying element experiences excessive reverse voltage and the device may break down
Solution Approach 1:
The patent introduces a constant voltage diode as an intermediary protective element connected in parallel with the rectifying element. This mediator clamps the reverse voltage to a safe level (reverse withstand voltage of the rectifying element minus a margin), preventing the harmful high reverse voltage from reaching the rectifying element while allowing the rectifier to operate at high voltage during normal rectification mode
Solution Approach 2:
The patent changes the voltage parameter by using the constant voltage diode to clamp the reverse voltage to a specific safe value. The constant voltage diode's reverse breakdown voltage is carefully selected to be slightly lower than the rectifying element's reverse withstand voltage, creating a parameter threshold that protects the rectifying element from excessive reverse voltage while maintaining efficient rectification operation
2Reliability
If the reverse voltage of the constant voltage diode is set lower than the reverse withstand voltage of the rectifying element to ensure protection, then breakdown is prevented, but the voltage utilization efficiency decreases
Solution Approach 1:
The patent optimizes the voltage parameter by setting the constant voltage diode's reverse breakdown voltage to a specific value that is slightly lower than the rectifying element's reverse withstand voltage. This parameter selection ensures adequate protection margin while minimizing the impact on voltage utilization during normal operation, as the clamping only activates during reverse voltage conditions
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 enhances the reliability of the rectifying device and rectenna apparatus by preventing reverse voltage exceeding the rectifying element's withstand voltage, thereby ensuring stable operation even under fluctuating power conditions.
Implementation Method 1
Impedance of the impedance changer varies while having a negative correlation with respect to an absolute value of voltage of the direct current power
Data Source
AI summary
The rectifying device converts high-frequency power input from an input terminal into direct current power and outputs the direct current power from an output terminal. The rectifying device includes a rectifier that converts the high-frequency power into the direct current power, and an impedance changer having one end connected to a connection point of the rectifier and the output terminal and the other end to which reference voltage is applied such that impedance varies while having a negative correlation with respect to an absolute value of voltage of the direct current power. When the absolute value of the voltage of the direct current power is greater than a predetermined value that is lower than reverse withstand voltage of the rectifying element included in the rectifier, the impedance of the impedance changer as viewed from the rectifier is a value regarded as corresponding to a short circuit.