Predictive Voltage Regulator Transient Response
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Solution Overview
Problem
Voltage regulators in integrated circuits face challenges with transient response during rapid changes in current loading, leading to spikes or fluctuations in the regulated voltage, which can limit the effectiveness of the target circuit.
Innovation Solution
A circuit and method that include a voltage regulator and a current loading circuit with predictive logic to apply a current load during pre- and post-loading intervals, reshaping the output current waveform and reducing the magnitude of current load transitions, thereby minimizing voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large power MOSFET is used in the voltage regulator to handle high current, then the current handling capability is improved, but the gate capacitance increases which slows down the transient response
Solution Approach 1:
The patent applies preliminary action by predicting future current load demands based on detected patterns and proactively adjusting the power MOSFET gate voltage before the actual load change occurs. This anticipatory control prepares the regulator in advance, allowing it to respond faster to load transitions without being limited by the MOSFET's inherent gate capacitance charging time.
Solution Approach 2:
The patent replaces the traditional reactive feedback control mechanism with a predictive control system that uses pattern detection and timing circuits to anticipate load changes. This substitution of the control mechanism allows the system to overcome the physical limitations of MOSFET gate capacitance by acting before the mechanical/electrical inertia of the large MOSFET becomes a bottleneck.
2Stability of the object's composition
If the feedback loop time constant is increased to improve stability, then the steady-state regulation is improved, but the transient response becomes slower
Solution Approach 1:
The patent uses preliminary action by detecting patterns in the target circuit's operation that precede current load changes and triggering early adjustments to the power MOSFET gate voltage. This anticipatory mechanism allows the system to prepare for load transitions before they occur, effectively decoupling the transient response speed from the feedback loop time constant and maintaining stability while improving response.
Solution Approach 2:
The patent enhances the traditional feedback mechanism by adding a predictive component that monitors target circuit activity patterns and feeds forward control signals to the power MOSFET gate driver. This combined feedback-forward control system maintains the stability benefits of the feedback loop while adding the speed improvement of predictive action, resolving the contradiction between stability and transient response.
3Speed
If the voltage regulator responds quickly to load changes, then the transient response is improved, but voltage spikes and fluctuations occur during transitions
Solution Approach 1:
The patent applies preliminary action by predicting upcoming load changes based on detected patterns in target circuit operation and proactively adjusting the power MOSFET gate voltage before the load transition occurs. This anticipatory control smooths the transition by preparing the regulator in advance, achieving fast response without causing voltage spikes or fluctuations that would result from reactive adjustments.
Solution Approach 2:
The patent uses preliminary anti-action by detecting patterns that indicate upcoming load increases and applying counteracting control signals to the power MOSFET gate driver before the load change occurs. This preemptive counter-action prevents the voltage drops or spikes that would normally occur during rapid load transitions, maintaining voltage stability while achieving fast transient response.
4Device complexity
If a simple voltage regulator design is used, then the device complexity is reduced, but the ability to handle rapidly changing loads is worsened
Solution Approach 1:
The patent introduces an intermediary pattern detection and prediction circuit that monitors target circuit activity and generates control signals for the power MOSFET gate driver. This intermediary layer adds predictive capability to the regulator without requiring complete redesign of the core voltage regulation architecture, maintaining relative simplicity while significantly improving the ability to handle rapid load changes through anticipatory control.
Data Source
AI summary
A circuit and a method for supplying a regulated voltage to a target circuit characterized by fast changes in current loading are described. A voltage regulator supplies the regulated voltage to an output node. A current loading circuit is connected to the output node of the voltage regulator. Logic causes the current loading circuit to apply a current load to the output node during a pre-loading interval starting in advance of an event that increases current loading in the target circuit and ending upon occurrence of the event. Logic is included to cause the current loading circuit to apply a current load to the output node during a post-loading interval starting upon occurrence of an event that decreases current loading in the target circuit.