DC-DC Regulator Protection Path Segmentation
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Solution Overview
Problem
Conventional non-isolated dc-dc converters face inefficiencies due to protection switches experiencing full voltage and current stresses, leading to increased power losses and reduced reliability in telecommunication power systems.
Innovation Solution
A high efficiency non-isolated dc-dc switching regulator system is implemented, featuring a protection device with a switching element connected between the switching mode power converter and the voltage bus, reducing current and power losses by placing the protection device between the intermediate point and the third voltage bus, thereby minimizing stress on the protection switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protection switches are placed in the main power path of the dc-dc converter, then protection function is achieved, but full voltage and current stresses cause extra power losses
Solution Approach 1:
The patent segments the power path into two separate paths: a main power path for normal operation and a protection path for fault conditions. The protection switch is placed only in the protection path, not in the main power path, so it only handles fault currents rather than full operating currents, significantly reducing power losses while maintaining protection functionality.
Solution Approach 2:
The patent introduces an intermediary configuration where the protection switch operates through a separate protection path rather than directly in the main power path. This intermediary structure allows the protection switch to perform its protective function without bearing the full voltage and current stresses of normal operation, thereby reducing power losses.
2Ease of operation
If protection device is placed between input voltage bus and buck dc-dc converter, then inrush current is limited, but protection switch endures full voltage stress
Solution Approach 1:
The patent segments the protection function into a separate protection path that handles inrush current limiting and fault protection, distinct from the main power path. The protection switch in this segmented structure only encounters voltage stress during fault conditions or inrush current events, not during normal operation, thereby reducing overall voltage stress exposure.
3Reliability
If protection switches handle full voltage and current stresses, then comprehensive protection is provided, but device size and power loss increase
Solution Approach 1:
The patent segments the protection functionality into a dedicated protection path separate from the main power path. This segmentation allows the protection switch to be optimized for protection functions only, handling fault currents and voltages rather than full operating parameters, thereby reducing the required device size while maintaining comprehensive protection.
Solution Approach 2:
The patent applies local quality by designing the protection path with components optimized specifically for protection functions. The protection switch in this localized protection path only needs to handle fault conditions, allowing it to be smaller and more efficient than a switch designed to handle full operating voltage and current continuously.
Data Source
AI summary
A power regulator includes an input capacitor connected between a first voltage bus and an intermediate point, an output capacitor connected between a second voltage bus and the intermediate point, a plurality of switches and an inductor connected between the input capacitor and the output capacitor, wherein a source of one switch of the plurality of switches is connected to the intermediate point and a protection device connected between the intermediate point and a third voltage bus.