Voltage Regulator Deglitch Circuit for Overshoot Filtering
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Solution Overview
Problem
Power regulation in battery-operated devices faces challenges due to rapid power fluctuations and voltage oscillations, making it difficult for voltage regulation circuitry to provide stable power to integrated circuits.
Innovation Solution
A multi-phase DC-DC switching voltage regulator with a bypass switch and a deglitch circuit that determines overvoltage conditions and operates switches based on smoothed indicators to manage voltage overshoots, allowing for efficient power management by selectively entering bypass mode when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If voltage regulation circuitry responds immediately to voltage overshoot indicators, then voltage stability is improved, but transient false indications cause unnecessary bypass switch operations and increased voltage oscillations
Solution Approach 1:
The deglitch circuit performs preliminary filtering of voltage overshoot indicators before they reach the controller. By removing transient indications in advance, the circuit prevents false bypass switch operations while maintaining the ability to respond to genuine voltage overshoot conditions, thus improving both voltage stability and reliability
Solution Approach 2:
The deglitch circuit acts as an intermediary between the overvoltage comparator and the controller. It smooths the voltage overshoot indicators by removing transient spikes, providing a cleaner signal to the controller that enables more reliable decision-making about when to activate the bypass switch
2Stability of the object's composition
If the bypass switch is activated frequently to correct voltage overshoot, then voltage regulation is improved, but battery life is reduced due to increased power consumption
Solution Approach 1:
The system uses feedback from the deglitch circuit to intelligently control bypass switch activation. By providing smoothed voltage overshoot indicators, the feedback mechanism ensures the bypass switch is activated only when genuinely needed, avoiding unnecessary operations that would consume battery power while still maintaining proper voltage regulation
Solution Approach 2:
The deglitch circuit changes the temporal parameters of the voltage overshoot indicator by filtering out transient indications. This parameter transformation converts noisy, frequent signals into smoother, more reliable indicators, reducing the frequency of bypass switch activations and thereby extending battery life while maintaining voltage regulation
3Reliability
If transient indications are removed from voltage overshoot signals, then false operations are reduced, but response time to genuine overshoot conditions increases
Solution Approach 1:
The deglitch circuit applies partial filtering to the voltage overshoot indicator, removing only transient false indications while preserving genuine overshoot signals. This selective filtering approach maintains adequate response time to real voltage overshoot conditions while eliminating false alarm operations
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 effectively stabilizes output voltage by reducing oscillations and extending battery life by managing voltage fluctuations, ensuring stable power delivery to integrated circuits.
Implementation Method 1
an output inductor having a first end coupled to a node between the high side switch and the low side switch and a second end coupled to a load
Implementation Method 2
a multi-phase DC-DC switching voltage regulator with a plurality of parallel phases coupled to an output capacitor and a load in parallel
Data Source
AI summary
A deglitch circuit, or look-back, may be used to reduce or avoid reacting to a transient overvoltage situation by a voltage regulator. The voltage regulator may delay reacting to an overvoltage situation unless the overvoltage situation persists for more than a first programmable number of cycles.