Bidirectional Surge Protection Circuit for Integrated Circuits
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Solution Overview
Problem
Conventional protection circuits for integrated circuits can only achieve either reverse connection protection or surge protection, leading to complexity and resource wastage when separate circuits are used for each, failing to effectively protect against both negative and positive surge voltages.
Innovation Solution
A protection circuit comprising a first and second gate drive circuit, a transistor, diode, and control circuit that discharges input voltage based on threshold voltages to prevent damage from reverse connection and surge voltages, integrating both surge and reverse connection protection in a single circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate protection circuits are used for positive surge protection and negative surge protection, then comprehensive surge protection is achieved, but the circuit becomes complicated and the electrical appliance size increases
Solution Approach 1:
The patent combines positive surge protection and negative surge protection into a single integrated protection circuit. The circuit uses a unified structure with transistors, diodes, and resistors that can handle both positive and negative voltage surges simultaneously, eliminating the need for separate protection circuits and reducing overall circuit complexity.
Solution Approach 2:
The protection circuit is designed with multi-functional components that can respond to both positive and negative surge conditions. The circuit includes bidirectional protection mechanisms where the same circuit elements can clamp both positive and negative voltage spikes, making the protection system universal rather than specialized for single-direction surges.
2Device complexity
If only one type of surge protection (positive or negative) is implemented, then the circuit remains simple, but the electrical appliance is vulnerable to the other type of surge
Solution Approach 1:
The patent merges positive and negative surge protection capabilities into a single circuit architecture. The circuit uses complementary transistor pairs and bidirectional clamping mechanisms that provide both protection functions simultaneously without requiring separate circuit paths, thus maintaining simplicity while achieving comprehensive protection.
Solution Approach 2:
The circuit design converts the potential harm of complex bidirectional protection into a benefit by using symmetric circuit topologies where the same components provide dual protection. The harmful complexity is transformed into a beneficial unified structure that naturally handles both positive and negative surges through its inherent symmetry and complementary component arrangement.
Data Source
AI summary
A protection circuit is provided. A control circuit receives an input voltage. In a case that the input voltage is lower than a negative threshold voltage, the control circuit outputs a first control voltage to a surge bleeder circuit through a first output end of the control circuit, to control the surge bleeder circuit to discharge the input voltage and output a first bleeder current. In a case that the input voltage is higher than a positive threshold voltage, the control circuit outputs a second control voltage to the surge bleeder circuit through a second output end of the control circuit, to control the surge bleeder circuit to discharge the input voltage and output a second bleeder current.