Dual Chopper Circuit Control for Stable Input Current
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing control methods for switching power supply circuits, particularly in modes 4 and 5, result in variation of the input current due to the operation and suspension of step-up switching converters, which affects efficiency.
Innovation Solution
A control device with a mode controller and operation controller that shifts operation modes between chopper circuits based on input current, power levels, and temperature, ensuring that both chopper circuits perform chopping operations when power is high to reduce current and temperature-related losses, and suspend operations when power is low to minimize switching losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If one step-up switching converter is suspended and the other operates repeatedly (modes 4 and 5), then power source efficiency is improved at low load currents, but variation of input current is created
Solution Approach 1:
The patent applies periodic action by implementing intermittent chopping operations in the second chopper circuit during low power conditions. The control device periodically activates and deactivates the second chopper circuit based on power level detection, creating a rhythmic operational pattern that reduces switching losses while managing input current characteristics through controlled periodicity rather than continuous operation
Solution Approach 2:
The patent changes operational parameters by switching between different operational modes (first, second, and third modes) based on power level. At low power levels, it transitions to the second mode where the second chopper circuit operates intermittently with adjusted chopping duty ratios, thereby adapting the system's operational characteristics to minimize energy loss while managing current variation through parameter adjustment
Data Source
AI summary
A mode controller shifts, along with increase in an electric power in first and second of chopper circuits and, operation modes of the first and the second of the chopper circuits from a first mode to a third mode via a second mode. An operation controller causes, in the first mode, the first of chopper circuit to perform an chopping operation, and the second of chopper circuit to suspend the chopping operation, in the second mode, causes the first and the second of chopper circuits to alternatively perform the chopping operations, and in the third mode causes both of the first and the second of chopper circuits to perform the chopping operations.