Gate Driver Power Rail Regulation Without LDO Voltage Bounce
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Solution Overview
Problem
Existing power rail generation systems for gate drivers in switching converters suffer from inefficiencies due to current imbalances, leading to inconsistent functionality and high power consumption, with LDOs consuming excess current and causing voltage bounces that affect switching efficiency and device safety.
Innovation Solution
A power rail generation system that locally generates power rail voltages for gate drivers, using a digital code and adaptive diodes to maintain a constant voltage difference from local voltages, eliminating the need for always-on LDOs and preventing voltage bounces, ensuring reliable switching operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LDOs are used to generate power rail voltages, then the power rail voltage is regulated, but the power consumption increases and voltage bounces occur
Solution Approach 1:
The patent implements periodic action by enabling the LDO only during specific switching phases (e.g., when the high-side switch is ON) rather than keeping it continuously ON. This is achieved through phase-based control signals that activate the LDO in synchronization with the switching converter operation, reducing overall power consumption while maintaining voltage regulation during critical periods
Solution Approach 2:
The patent applies dynamics by making the LDO operational state dynamic rather than static. The LDO is dynamically enabled and disabled based on real-time switching phase detection and voltage threshold monitoring, allowing the system to adapt power consumption to actual operational needs while maintaining reliable voltage regulation when required
2Reliability
If LDOs are used to generate power rail voltages, then the power rail voltage is regulated, but voltage bounces occur affecting switching efficiency
Solution Approach 1:
The patent synchronizes LDO operation with periodic switching phases, enabling voltage regulation only during phases where it is critical (e.g., when high-side switch is ON). This periodic activation prevents voltage bounces during switching transitions while maintaining regulation during stable periods, thereby preserving switching efficiency
Solution Approach 2:
The patent implements skipping by bypassing the LDO regulation during switching transition periods where voltage bounces would occur, and only activating regulation during stable operating phases. This selective skipping of LDO operation during critical switching moments prevents voltage bounce-induced efficiency losses
3Adaptability or versatility
If current imbalance is present between switching converters, then the system operates with multiple converters, but gate driver functionality becomes inconsistent
Solution Approach 1:
The patent applies local quality by providing independent voltage regulation for each gate driver circuit rather than using a shared regulation system. Each gate driver has its own LDO with locally controlled enable signals, ensuring that voltage regulation and gate driver functionality remain consistent and independent of current imbalances in other converters
Solution Approach 2:
The patent segments the power rail generation system into independent units, with each gate driver having its own dedicated LDO and control circuitry. This segmentation isolates gate driver functionality from current imbalance effects in other converters, maintaining consistent operation across multiple converters
4Reliability
If LDOs are kept always ON to regulate power rail voltage, then voltage regulation is maintained, but power consumption exceeds 2 μA DC current
Solution Approach 1:
The patent implements periodic action by enabling the LDO only during specific switching phases rather than continuously, synchronizing regulation activity with actual operational requirements to minimize DC current consumption while maintaining voltage regulation during critical periods
Solution Approach 2:
The patent applies self-service through voltage threshold monitoring circuits that automatically detect when regulation is needed and enable the LDO accordingly. The system monitors its own voltage conditions and activates regulation only when thresholds are exceeded, eliminating the need for continuous LDO operation and reducing DC current consumption below 2 μA
Data Source
AI summary
A power rail generation system is provided. The system includes a first power rail generator. The first power rail generator is configured to generate a first power rail voltage for a first gate driver. The first gate driver is configured to drive a switching operation of a first power switch of a first switching converter. The first power rail generator is further configured to regulate the first power rail voltage to have a substantially constant first voltage difference from a first local voltage during operation of the first switching converter.