Semiconductor Bypass Switch Using Anti-Fuse MOSFET Burnout
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Solution Overview
Problem
In electronics, when one device in a series string fails, such as LED lights or heaters, the entire string loses power, leading to increased wiring and component costs, as well as reliability issues, due to the 'Christmas tree light problem', where parallel wiring is often used to avoid this but increases costs and redundancy.
Innovation Solution
A semiconductor-based circuit bypass device allows series wiring by using anti-fuse semiconductors that short out to maintain power to other devices in the series when one fails, using a high impedance initially and then decreasing to allow current bypass, enabling continuous operation of connected loads like LED lighting fixtures and heaters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If devices are wired in series to minimize copper costs and eliminate circuit redundancies, then wiring costs and component costs decrease, but when one device fails the entire string loses power and reliability decreases
Solution Approach 1:
A bypass device is introduced as an intermediary component connected in parallel with each series device. This bypass device includes a trigger mechanism and a low-impedance path that activates when the series device fails, allowing current to continue flowing through the bypass path and keeping the rest of the series circuit operational.
Solution Approach 2:
The bypass device is pre-configured with a trigger mechanism that detects device failure beforehand. When a series device fails, the trigger automatically activates the low-impedance bypass path, cushioning the impact of the failure and preventing it from shutting down the entire series circuit.
2Reliability
If parallel wiring is used to maintain power to other devices when one fails, then reliability improves, but wiring costs and component costs increase
Solution Approach 1:
The bypass device is segmented into distinct functional components: a trigger mechanism that detects device failure and a separate low-impedance bypass path that activates upon failure. This segmentation allows the bypass function to be integrated with each series device, eliminating the need for complete parallel wiring of all devices.
Solution Approach 2:
The bypass device transitions from a high-impedance off state during normal operation to a low-impedance on state when triggered by device failure. This dynamic impedance change allows the circuit to maintain series wiring configuration during normal operation (saving copper) while automatically providing parallel bypass paths when needed (maintaining reliability).
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 solution minimizes copper costs, eliminates circuit redundancies, and improves reliability by allowing series connections while ensuring that other devices remain powered even if one fails, reducing the need for costly parallel wiring and enhancing system reliability.
Implementation Method 1
The semiconductor device includes a conduction segment, a gate, and a drain. The gate is connected to the drain via a diode voltage drop and a resistance. When a high voltage that exceeds the reverse voltage across the diode is applied between the plus and minus terminals, the high voltage asserts a voltage between the gate and the conduction segment that exceeds a voltage rating of the conduction segment, thereby destroying the conduction segment and forming a low impedance between the plus and minus terminals.
Data Source
AI summary
An anti-fuse having two electrical connections is constructed by adding at least one zener diode and resistor to a power MOSFET. When the voltage across the two electrical connections exceeds the zener diode voltage and the maximum gate voltage of the MOSFET, the MOSFET burns out. This shorts out the device which can be used to bypass an LED or other load when that load burns out and forms an open circuit.