DC-DC Converter Pull-Up Down Current Injection Settling Time
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Solution Overview
Problem
Conventional DC-DC converters face a tradeoff between settling time and output voltage ripple, with smaller inductance reducing settling time but increasing ripple, and additional charging paths are difficult to control effectively.
Innovation Solution
The DC-DC converter incorporates a pull-up and pull-down circuit that provide currents proportional to the inductor current, allowing for controlled charging and discharging to reduce settling time without using a smaller inductor, thereby alleviating ripple issues and simplifying circuit response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the inductance of the inductor is reduced to shorten settling time, then the settling time decreases, but the output voltage ripple increases
Solution Approach 1:
The patent introduces a current injection circuit as an intermediary component that injects a controlled current into the output node. This current injection acts as a mediator to accelerate the voltage transition during settling without requiring reduction of the inductor value, thereby avoiding the increase in output voltage ripple that would result from using a smaller inductor.
2Loss of time
If an additional charging path is added to shorten settling time, then the settling time decreases, but the circuit response becomes difficult to control
Solution Approach 1:
The current injection circuit is controlled by a control unit that receives feedback signals from the DC-DC converter system. This feedback mechanism allows the control unit to dynamically adjust the injection current based on the actual system state, ensuring stable and controllable circuit response while achieving faster settling time.
Solution Approach 2:
The patent changes the operating parameters of the system by dynamically adjusting the injection current magnitude and timing based on system conditions. This parameter control approach enables precise management of the additional charging path's effect, maintaining circuit response controllability while achieving reduced settling time.
Data Source
AI summary
A DC-DC converter includes an inductor, a switch module, and a pull-up circuit or a pull-down circuit. The inductor has a first node and a second node, and the second node is coupled to an output node of the DC-DC converter. The switch module is arranged for selectively connecting an input voltage or a ground voltage to the first node of the inductor according to a driving signal. The pull-up circuit is arranged for selectively providing a first current to the output node of the DC-DC converter. The pull-down circuit is arranged for selectively sinking a second current from the output node of the DC-DC converter. In addition, the first current or the second current is determined based on an inductor current flowing through the inductor.