Boost Converter Average Current Control for Limited Input Power
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Solution Overview
Problem
Boost converters with limited input current sources, such as USB Type-C cables, often fail to efficiently utilize the available power due to peak or valley current regulation, leading to inefficient energy use, especially during startup or short-circuit conditions.
Innovation Solution
A boost converter with an average current control circuit that regulates the DC input current, using an ISO FET control circuit and a PWM circuit to adjust the duty cycle of the switching transistor based on the average inductor current, ensuring efficient energy use and stable operation during varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If peak or valley current regulation is used in boost converters, then the converter can operate with simple control circuits, but the available power from limited input current sources (such as USB Type-C cables) is not efficiently utilized
Solution Approach 1:
The patent changes the control parameter from peak/valley current regulation to average input current regulation. The average input current control circuit monitors and regulates the average current drawn from the input source, allowing the converter to efficiently utilize available power while maintaining simple circuit implementation. This parameter change enables optimal energy extraction from limited sources like USB Type-C cables.
2Use of energy by moving object
If average input current control is implemented to efficiently utilize limited power sources, then energy utilization efficiency is improved, but the control circuit complexity increases
Solution Approach 1:
The patent introduces an intermediary average input current control circuit that simplifies the control architecture. This control circuit acts as a mediator between the input current source and the switching regulator, providing average current regulation without requiring complex multi-stage control circuits. The intermediary circuit enables efficient energy utilization while maintaining relatively simple overall system complexity.
3Ease of operation
If conventional current regulation methods are used, then the control implementation is straightforward, but stable operation during startup or short-circuit conditions cannot be ensured
Solution Approach 1:
The patent implements feedback control through the average input current control circuit, which continuously monitors the input current and adjusts the duty cycle accordingly. This feedback mechanism ensures stable operation during startup and short-circuit conditions by preventing excessive current draw, while maintaining straightforward control implementation through direct average current measurement and regulation.
4Device complexity
If the duty cycle is not dynamically adjusted based on average inductor current, then the switching control is simple, but efficient energy use and stable operation during varying conditions cannot be achieved
Solution Approach 1:
The patent implements dynamic duty cycle adjustment based on average inductor current feedback. The control circuit dynamically modifies the switching duty cycle in response to changing load conditions and input voltage levels, enabling efficient energy conversion while maintaining relatively simple switching control architecture. This dynamic adaptation ensures optimal performance across varying operating conditions.
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 enables efficient use of limited input current, maintaining stable output voltage and managing startup or short-circuit conditions by dynamically controlling the average inductor current, thereby optimizing energy utilization and ensuring reliable operation.
Implementation Method 1
an inductor having a first end and a second end, the first end of the inductor coupled to the switch node
Implementation Method 2
a switching transistor coupled between the switch node and ground, a gate of the switching transistor coupled to a switching control signal
Data Source
AI summary
A voltage converter having a voltage input and a voltage output, the voltage converter including a first and second transistors and an average current control circuit. The first transistor has a first control input, a first current terminal, and a second current terminal. The first current terminal is adapted to be coupled to a switch node. The second transistor has a second control input, a third current terminal, and a fourth current terminal. The third current terminal is adapted to be coupled to an inductor. The average current control circuit is coupled to the third current terminal and the fourth current terminal. The average current control circuit is configured to determine an average current level of current flowing through the second transistor and to control a voltage on the first control input of the first terminal based on the determined average current level.