Voltage Regulator Pass-Hold Network for Fast Dynamic Response
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Solution Overview
Problem
Conventional voltage regulators with droop control suffer from slow dynamic voltage response due to the conflict between droop control and dynamic voltage response, requiring complex tuning and being prone to aging issues, which hinders fast power mode switching and overall power efficiency.
Innovation Solution
A modulator with a pass/hold network is implemented to temporarily inhibit the droop function during dynamic voltage response, allowing for quick voltage adjustments by holding the droop current steady until the new voltage level is reached, thereby avoiding the need for customer tuning and addressing aging component drifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If droop control is implemented in voltage regulators, then load transient response is improved, but dynamic voltage response becomes slow due to conflict between droop control and VID switching
Solution Approach 1:
The patent implements a pass/hold network that dynamically switches between two operational modes: pass mode for normal droop control operation and hold mode for fast dynamic voltage response. The network uses control signals (HOLD, STRT, STOP) to transition the droop control circuit between these states, enabling the system to adapt its behavior based on whether a VID transition is occurring. This dynamic switching resolves the contradiction by allowing both droop control functionality and fast VID response without permanent conflict.
Solution Approach 2:
The patent employs preliminary action by detecting VID transitions in advance and preemptively switching the droop control to hold mode before the actual voltage adjustment completes. The STRT signal is generated when a VID transition is detected, which triggers the pass/hold network to enter hold mode and freeze the droop current. This preliminary switching prevents the droop control from interfering with the upcoming voltage change, enabling faster response while maintaining load transient performance.
2Reliability
If conventional droop control is used, then load transient response is maintained, but complex tuning and aging issues arise
Solution Approach 1:
The pass/hold network operates autonomously based on control signals generated from VID transition detection. When a VID transition is detected, the network automatically switches to hold mode without requiring external tuning or adjustment. The system self-manages the conflict between droop control and dynamic response by internally generating the HOLD control signal based on the STRT and STOP signals. This eliminates the need for complex customer tuning while maintaining both load transient response and fast dynamic voltage response.
3Reliability
If droop control is active during VID transitions, then voltage regulation is maintained, but power mode switching speed is reduced
Solution Approach 1:
The patent segments the droop control operation into distinct phases: pass mode for normal operation and hold mode for VID transitions. The pass/hold network divides the control signal path, allowing the droop current to be frozen during VID transitions while maintaining the regulatory function through the held value. This segmentation enables the system to maintain voltage regulation reliability while eliminating the time loss associated with continuous droop control adjustments during mode switching.
Data Source
AI summary
A dynamic voltage response network for a switching regulator with droop control providing a droop control signal includes a voltage identification setting network, a pass and hold system, and a reset network. The voltage identification setting network initiates a hold condition and adjusts an output voltage reference in response to a change in a voltage identification input. The pass and hold system passes the droop control signal during a pass condition and holds the droop control signal during the hold condition. The reset network resets the pass and hold system to the pass condition in response to a reset signal. The reset signal may be provided in response to a variety of conditions, such as load transients, proximity between the developed droop control signal and the held droop control signal, timeout after the output voltage reference is adjusted, among other reset conditions.