Wireless Charging Rectifier Circuit With Redundant Diodes
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Solution Overview
Problem
Existing wireless charging rectifier circuits for ventricular assist devices suffer from low safety and reliability due to potential diode failures leading to short circuits or overloads, which can cause abnormal device operation and pose safety risks to patients.
Innovation Solution
A redundant rectification design is implemented using first and second diodes in parallel, where the first diode serves as the main rectifier and the second diode acts as a backup, along with filter circuits to ensure continuous rectification and filtering even when a first diode fails, enhancing reliability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single diode is used in the bridge rectifier circuit, then the device structure is simple, but the reliability is low due to potential diode failures leading to short circuits or overloads
Solution Approach 1:
The patent applies beforehand cushioning by configuring second diodes in parallel with first diodes before any failure occurs. These second diodes remain inactive during normal operation but automatically activate to provide backup rectification paths when first diodes fail, preventing short circuits and overloads before they can cause device damage. This preemptive redundancy design ensures continuous safe operation without requiring real-time monitoring or complex control mechanisms.
Solution Approach 2:
The patent implements local quality by creating non-uniform diode configurations within the bridge rectifier circuit. Specifically, certain bridge arms are equipped with both first and second diodes in parallel, while other arms have only single diodes. This selective redundancy approach targets critical positions where diode failure would have the most severe consequences, optimizing reliability while minimizing the increase in device complexity.
2Reliability
If redundant diodes are added in parallel, then the reliability improves, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the bridge rectifier circuit into multiple independent bridge arms, with each arm potentially having its own redundant diode configuration. This modular approach allows the reliability improvement to be localized to specific critical areas rather than requiring redundant components throughout the entire circuit. Each segment can be independently analyzed and optimized, making the overall system more manageable despite the added complexity.
3Reliability
If diode failure occurs, then the device may experience short circuit or overload, but adding backup diodes increases manufacturing cost
Solution Approach 1:
The patent applies partial or excessive action by implementing redundancy only in specific bridge arms rather than in all arms. This selective approach provides sufficient reliability improvement for critical positions while avoiding the excessive cost and manufacturing complexity that would result from full redundancy throughout the entire bridge rectifier circuit. The design achieves an optimal balance between operational safety and manufacturing feasibility.
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 redundant rectification and filtering design improves the reliability and safety of the wireless charging rectifier circuit, ensuring stable power supply to the ventricular assist device and reducing heat generation, thereby ensuring patient safety and extending device lifespan.
Implementation Method 1
each of four bridge arms of the bridge rectifier circuit is respectively connected to a first diode and at least one second diode which are connected to each other in parallel, and the at least one second diode is configured to perform rectification when the parallel first diode fails
Implementation Method 2
a wireless charging rectifier circuit, which is configured to rectify and filter an alternating current signal of the ventricular assist device
Data Source
AI summary
A wireless charging rectifier circuit, a wireless charging device and a ventricular assist device, the wireless charging rectifier circuit comprising a first filter circuit, a bridge rectifier circuit and a second filter circuit which are connected in sequence, each bridge arm of four bridge arms of the bridge rectifier circuit being connected to a first diode and at least one second diode which are connected in parallel, and the at least one second diode being used to perform rectification when the first diode connected in parallel fails.