DC-DC Converter Startup via Sequential Power Segment Activation
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Solution Overview
Problem
Conventional DC-DC converters experience significant input voltage droop, in-rush current, and output voltage jumps during startup due to component variations and limitations in feedback control, leading to potential system shutdown and malfunction.
Innovation Solution
A DC-DC converter system with multiple power segments that can be dynamically controlled to limit in-rush current and voltage droop by sequentially activating FET switches in a PWM-controlled manner, using feedback from the output voltage to manage the ramp-up process and prevent excessive current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional feedback control with error comparator is used during startup, then output voltage regulation is achieved, but significant input voltage droop and in-rush current occur due to low feedback voltage and component variation
Solution Approach 1:
The power stage is divided into multiple parallel power segments (first power segment, second power segment, etc.) that can be independently controlled. During startup, only the first power segment is initially activated to limit in-rush current, and additional segments are progressively enabled as output voltage stabilizes, thereby reducing input voltage droop while maintaining regulation capability.
2Power
If all power segments are activated simultaneously during startup, then maximum power delivery is achieved, but output voltage jumps and system malfunction occur
Solution Approach 1:
The controller enables power segments in a predetermined sequence during startup rather than simultaneously. The first power segment is enabled initially, and subsequent segments are enabled only after specific conditions are met (such as output voltage reaching certain thresholds or time delays), preventing output voltage jumps and allowing gradual power buildup.
3Object-generated harmful factors
If multiple power segments are sequentially activated to limit in-rush current, then input voltage droop is reduced, but device complexity increases
Solution Approach 1:
The controller monitors output voltage and uses feedback signals to determine when to enable additional power segments. This feedback mechanism automatically manages the complexity of sequential activation, enabling the system to reduce input voltage droop through controlled segment activation without requiring complex external control circuitry.
Data Source
AI summary
Generally, this disclosure provides methods and systems for improved startup for DC-DC converters that reduce input voltage droop, in-rush current and output voltage jumps. The system may include a power stage circuitry including a plurality of power segments coupled in parallel, the power stage circuitry is coupled between an input voltage and output stage circuitry and configured to deliver power to a load coupled to the output stage circuitry. The system may further include PWM and power stage controller circuitry configured to sequentially and progressively activate the plurality of power segments to limit an input in-rush current from the input voltage during a ramp up period and output voltage at the output stage circuitry.