Single Inductor Multi-Output DC-DC Converter Cross Regulation Control
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Solution Overview
Problem
Single-inductor multi-output (SIMO) DC-DC converters face challenges with cross regulation due to the use of a single inductor, leading to inefficiencies in voltage regulation across multiple outputs.
Innovation Solution
A SIMO DC-DC converter design that includes an inductor, a ground switch, an inductor switch, output switches, and a switch controller to monitor and control pulse widths, reducing cross regulation by maintaining energy storage and managing voltage across multiple outputs within a predetermined range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single inductor is used in SIMO DC-DC converter, then area and cost are reduced, but cross regulation occurs between multiple outputs
Solution Approach 1:
The patent segments the control of the single inductor by introducing multiple independently controllable switches (inductor switch, ground switch, and multiple output switches) that can be selectively activated. This allows the single inductor to serve multiple output channels with independent control, reducing cross-regulation while maintaining area efficiency. Each output channel can be controlled separately through its dedicated switch, enabling precise voltage regulation without requiring separate inductors for each channel.
2Reliability
If multiple inductors are used in MIMO DC-DC converter, then cross regulation is reduced, but area and cost increase
Solution Approach 1:
The patent merges multiple inductor functions into a single shared inductor component. By using one inductor that is controllably connected to multiple output channels through independent switches, the design achieves the voltage regulation stability of multi-inductor systems while reducing the total component count and area. The inductor serves multiple purposes simultaneously, providing energy storage and regulation for multiple outputs without requiring duplicate inductor components.
3Ease of manufacture
If a single inductor is used in SIMO DC-DC converter, then cost is reduced, but cross regulation occurs between multiple outputs
Solution Approach 1:
The patent changes the control parameters by introducing independent pulse width modulation (PWM) control for each output channel through dedicated switches. This allows precise adjustment of duty cycles for each output, enabling independent voltage regulation without cross-interference. The parameter control approach replaces the need for multiple physical inductors, reducing cost while maintaining regulation stability through sophisticated switching control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces cross regulation, ensuring stable voltage across multiple outputs, thereby improving the efficiency and performance of SIMO DC-DC converters.
Implementation Method 1
an inductor configured to store input energy
Implementation Method 2
output switches configured to output the energy stored in the inductor as multi-output voltages
Data Source
AI summary
Provided is a DC-DC converter including an inductor configured to store input energy, a ground switch configured to provide a ground path of the inductor in response to a first signal, an inductor switch connected in parallel to the inductor so as to maintain the energy stored in the inductor in response to a second signal, output switches configured to output the energy stored in the inductor as multi-output voltages in response to third signals, and a switch controller including a switch controller configured to determine cross regulation between the multi-outputs and generate the first to third signals for decreasing the cross regulation.