Voltage Regulator Architecture for Load-Change Spike Suppression
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Solution Overview
Problem
Existing voltage regulation systems experience voltage spikes due to sudden load changes, which compromise the stability of the control loop and the effectiveness of voltage regulation, as the speed of the control loop is limited and cannot adjust quickly enough to handle sudden changes in load conditions.
Innovation Solution
A voltage regulation system comprising a voltage regulator, a bias voltage generator, and switch-load circuits with common-drain transistors and decoupling capacitors, where the size of the common-drain transistors is scaled according to the ratio of load current to bias current, allowing for independent power management and reducing the impact of decoupling capacitors on the control loop stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a decoupling capacitor is added to hold regulated voltage steadier during sudden load changes, then voltage spikes are reduced, but the stability of the control loop is degraded
Solution Approach 1:
The patent segments the voltage regulation function by introducing separate common-drain transistors for each load. These transistors act as local voltage regulation units that isolate the decoupling capacitors from the main control loop, allowing each load to have its own decoupling capacitor without affecting the overall loop stability. The segmentation enables independent power management for each load while maintaining global stability.
Solution Approach 2:
The common-drain transistors serve as intermediary elements between the voltage regulator and the loads. They buffer the interaction between the decoupling capacitors and the control loop, allowing the capacitors to suppress voltage spikes at the load level while preventing these capacitors from directly affecting the stability of the main control loop. This intermediary structure resolves the contradiction by localizing the spike suppression function.
2Speed
If the control loop speed is increased to respond faster to sudden load changes, then voltage regulation effectiveness is improved, but the system complexity and stability margins are reduced
Solution Approach 1:
The patent divides the voltage regulation task into two levels: the main control loop maintains stability with moderate speed, while local common-drain transistors provide fast response at each load node. This segmentation allows the system to achieve fast response without requiring the entire control loop to operate at high speed, thus maintaining stability margins.
Solution Approach 2:
Instead of making the entire control loop excessively fast, the patent applies partial action by using common-drain transistors that inherently provide fast local response. This partial approach achieves the necessary speed for handling sudden load changes without compromising the stability of the main control loop.
Data Source
AI summary
A voltage regulation system includes a voltage regulator configured to receive a first reference voltage and output a regulated voltage; a bias voltage generator comprising a diode-connect transistor configured to receive a bias current and output a reference gate voltage; and a plurality of switch-load circuits, each of said plurality of switch-load circuits comprising a common-drain transistor configured to receive power from the regulated voltage and control from the reference gate voltage via a switch controlled by a logical signal and output a supply voltage to load with a decoupling capacitor, wherein a size of the common-drain transistor is scaled from a size of the diode-connect transistor in accordance with a ratio between a current of the load and the bias current.