Resonance Suppression Circuit for Power Plugging Voltage Spikes
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Solution Overview
Problem
Parasitic components in circuits form serial resonant circuits during rapid power plugging and unplugging, leading to excessive harmonic voltages that can damage circuit components, and existing snubber circuits require complex adjustments for different circuit states.
Innovation Solution
A protection circuit with a voltage dividing circuit, comparators, and a delay and logic circuit that automatically detects voltage states to control the switch between the power voltage and a reference voltage, suppressing resonance amplitude by discharging current, and can be integrated into a chip to reduce external components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a snubber circuit composed of capacitors and resistors is used to eliminate voltage waveform generated by resonance, then the risk of component damage is reduced, but additional external circuit components are required and adjustment operations are needed for different circuit states
Solution Approach 1:
The protection circuit automatically detects resonance states through voltage division and comparison, then self-activates to suppress resonance by controlling the switch without requiring external adjustment operations. The circuit serves itself by monitoring its own state and taking corrective action autonomously.
Solution Approach 2:
The circuit changes the operating state of the switch between on and off based on detected voltage parameters. By dynamically adjusting the switch state according to resonance conditions, the circuit adapts to different operating states without requiring manual reconfiguration of external components.
2Reliability
If a snubber circuit is used to suppress resonance spikes, then component damage risk is reduced, but adjustment operations are required for different circuit states
Solution Approach 1:
The protection circuit autonomously monitors voltage parameters and automatically activates resonance suppression without requiring user intervention. The circuit detects when resonance occurs through the voltage dividing circuit and comparators, then self-corrects by controlling the switch state accordingly.
Solution Approach 2:
The circuit employs feedback through comparators that continuously monitor divided voltages against reference levels. When resonance conditions are detected, the feedback mechanism triggers the switch control to suppress the resonance, creating a closed-loop system that automatically responds to circuit conditions.
3Reliability
If traditional snubber circuits are implemented, then resonance suppression is achieved, but additional external circuit components increase device area
Solution Approach 1:
The protection circuit merges multiple functions into a single integrated system: voltage division, comparison, state detection, and switch control are combined in one circuit block. This consolidation eliminates the need for separate external snubber components while maintaining resonance suppression capability.
Solution Approach 2:
The protection circuit serves multiple functions simultaneously: it monitors voltage parameters, detects resonance states, controls the power switch, and suppresses voltage spikes. This multi-functional design replaces traditional dedicated snubber circuits, reducing the overall device area while providing 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
The protection circuit effectively reduces the risk of component damage by controlling resonance states and can be implemented with minimal external components, facilitating integration and programmable adjustments for various power supply applications.
Implementation Method 1
a voltage dividing circuit (110), a first comparator (CM1), a first switch (S1), a second comparator (CM2) and a delay and logic circuit (120)... The voltage dividing circuit (110) divides a power voltage (VP) to generate a first divided voltage (VD1) and a second divided voltage (VD2)
Implementation Method 2
The first comparator (CM1) is coupled to the voltage dividing circuit (110)... configured to compare a reference voltage (VBG) and the first divided voltage (VD1) to generate a first comparison result (CR1)... The second comparator (CM2) coupled to the voltage dividing circuit (110)... configured to compare the reference voltage (VBG) and the second divided voltage (VD2) to generate a second comparison result (CR2)
Implementation Method 3
When a first state or a second state occurs, the first switch (S1) is turned on to conduct part of current of the power voltage (VP) to a reference voltage terminal... When a third state or a fourth state occurs, the first switch (S1) changes from turn-on to turn-off
Implementation Method 4
The delay and logic circuit (120) is coupled to the first comparator (CM1) and the second comparator (CM2)... receives the first comparison result (CR1) and the second comparison result (CR2)... after a delay time (Td) counted by the delay and logic circuit (120)
Data Source
AI summary
A protection circuit including a voltage dividing circuit, a first comparator, a first switch, a second comparator, and a delay and logic circuit is provided. The voltage dividing circuit generates a first divided voltage and a second divided voltage based on a power voltage. The first comparator is configured to compare a reference voltage and the first divided voltage to generate a first comparison result. The second comparator is configured to compare the reference voltage and the second divided voltage to generate a second comparison result. The delay and logic circuit receives the first comparison result and the second comparison result. Wherein, according to a plurality of different states of the first comparison result and the second comparison result, the first switch is turned on to conduct part of current of the power voltage to a reference voltage terminal, or the first switch changes from turn-on to turn-off.