Chip Protection Circuit Using Transformer Induction
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Solution Overview
Problem
Electronic devices, such as chips, are vulnerable to damage from external factors like ESD and lightning, necessitating an effective protection mechanism.
Innovation Solution
A chip protection circuit comprising a transformer circuit, a first protection circuit with a diode, and a second protection circuit, which directs induced currents and surge signals to ground, preventing damage by leveraging transformer-induced currents and TVS diodes to bypass harmful signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a chip protection circuit is added to protect against surge signals, then the reliability of the chip is improved, but the device complexity increases
Solution Approach 1:
The patent implements a nested protection structure where the first protection circuit (diode to ground) is contained within the transformer circuit, and the second protection circuit (surge protective device) is positioned at the output side. This multi-layer nested arrangement provides comprehensive protection while organizing components in a structured manner that manages complexity.
Solution Approach 2:
The transformer circuit serves as an intermediary component between the surge signal input and the chip. It couples the surge signals from the first side to the second side while isolating the chip from direct surge exposure. The center tap terminal acts as an intermediate connection point that facilitates controlled signal transfer and protection.
2Reliability
If multiple protection circuits are used to handle different surge signals, then the protection effectiveness is improved, but the manufacturing cost increases
Solution Approach 1:
The transformer circuit performs multiple functions: it couples surge signals from different terminals, provides galvanic isolation, and enables the first protection circuit to shunt induced currents to ground. This multi-functionality reduces the need for separate dedicated components for each protection function, thereby controlling manufacturing costs.
Solution Approach 2:
The protection circuit is segmented into distinct functional modules: the transformer circuit for signal coupling and isolation, the first protection circuit (diode) for handling induced currents, and the second protection circuit for protecting against differential surge signals. This segmentation allows for optimized component selection and assembly, improving ease of manufacture while maintaining comprehensive protection.
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
Effectively protects chips from surge signals by diverting induced currents and surge signals to ground, preventing damage and ensuring the safe operation of electronic devices.
Implementation Method 1
the at least one first terminal and the at least one second terminal at the first side receiving a first surge signal, the at least one center tap terminal at the first side generates at least one induced current according to the first surge signal
Implementation Method 2
The first protection circuit comprises a diode. One terminal of the diode is coupled to the center tap terminal at the first side and another terminal of the diode is coupled to the ground. the at least one induced current is guided to the ground via the diode
Data Source
AI summary
A chip protection circuit applied to a chip. The chip protection circuit comprises a transformer circuit, a first protection circuit and a second protection circuit. The transformer circuit has a first side and a second side. Each of the first side and the second side is disposed with first terminals, second terminals and center tap terminals. Three center tap terminal is coupled to a ground. The first protection circuit comprises a diode having a terminal coupled to the center tap terminal at the first side and another terminal coupled to the ground. The second protection circuit comprises input terminals and output terminals. The input terminals of the second protection circuit are coupled to the first terminal and the second terminals at the second side. The output terminals of the second protection circuit are coupled to the chip.