Self-Protection Circuit Switching for Bidirectional Spike Suppression
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Solution Overview
Problem
Existing circuit protection methods, such as using parasitic capacitors or semiconductors, are ineffective in protecting circuits from both one-way and bidirectional spikes, and they can interfere with normal circuit operation.
Innovation Solution
A self-protection circuitry is designed with a first transistor circuit, a switch circuit, and a control circuit. The control circuit controls the switch circuit to be conducted before power is supplied to the transistor circuit and cut off after power is continuously supplied, thereby preventing damage from spikes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a parasitic capacitor or semiconductor is used to guide spikes to ground, then protection against spikes is improved, but the circuit operation is affected during normal operation
Solution Approach 1:
The control circuit activates the switch circuit in advance before power is supplied to the transistor circuit. This preliminary action ensures the protection path is ready before any potential spike can occur, allowing the parasitic capacitor to be connected to ground only when needed for protection, and disconnected during normal operation to avoid interference
Solution Approach 2:
The switch circuit dynamically changes the connection state of the parasitic capacitor based on the power supply status. During power supply initialization, the switch connects the parasitic capacitor to ground for spike protection. During normal operation, the switch disconnects it to avoid affecting circuit performance. This dynamic switching resolves the contradiction between protection and normal operation
2Reliability
If a parasitic capacitor is continuously connected to protect against spikes, then protection reliability is improved, but bidirectional spike protection is lost
Solution Approach 1:
The switch circuit enables dynamic reconfiguration of the parasitic capacitor connection. By controlling the switch to connect or disconnect the parasitic capacitor from the control terminal based on power supply status, the circuit can adapt to different operational states and protect against both one-way and bidirectional spikes, rather than being fixed in one configuration
3Reliability
If the switch circuit is always conducted to provide protection, then spike protection is improved, but interference with normal circuit operation increases
Solution Approach 1:
The switch circuit operates periodically based on the power supply status rather than continuously. It is conducted during power supply initialization when protection is most needed, and cut off during normal operation when the circuit is stable. This periodic switching provides protection when necessary while eliminating interference during normal operation
Data Source
AI summary
A self-protection circuitry is configured to receive a first power source. The self-protection circuitry includes a first transistor circuit, a first switch circuit, and a control circuit. The first transistor circuit includes a first input terminal, a first output terminal, and a first control terminal. The first output terminal is electrically connected to a ground terminal, and the first input terminal is configured to receive the first power source. The first switch circuit is electrically connected to the first control terminal and the first input terminal. The control circuit is electrically connected to the first switch circuit, and is configured to: before the first power source supplies power to the first transistor circuit, control the first switch circuit to be 10 conducted, and after the first power source continuously supplies power to the first transistor circuit, control the first switch circuit to be cut off.