DC-DC Converter Load Switching for Pulse Skip Flicker Control
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Solution Overview
Problem
Mobile communication terminals experience unstable battery power and flicker phenomena during pulse skip mode, particularly in GSM schemes, due to inefficient power conversion in DC-DC converters.
Innovation Solution
A DC-DC converter with a resistor unit, boost circuit, and buck circuit that senses input power voltage and adjusts the load of the output terminal by connecting a set resistor to the first output terminal when the input power voltage is within a specific range, thereby reducing or eliminating pulse skip mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If pulse skip mode is used to increase efficiency, then energy efficiency is improved, but battery power stability deteriorates
Solution Approach 1:
The DC-DC converter dynamically switches between pulse skip mode and continuous conduction mode based on the input voltage level. When input voltage is high, pulse skip mode is used for efficiency; when input voltage drops below a threshold, continuous conduction mode is activated to maintain stable output, thus resolving the contradiction between efficiency and stability
Solution Approach 2:
The converter changes its operating parameters (switching mode) based on the input voltage condition. By monitoring input voltage and adjusting the conduction mode accordingly, the system optimizes both efficiency and stability under different operating conditions
2Productivity
If pulse skip mode is used during low driving voltage, then switching operations are reduced, but flicker phenomenon occurs in display unit
Solution Approach 1:
The system changes the operating mode parameter based on input voltage conditions. When input voltage is sufficient, pulse skip mode reduces switching operations for efficiency; when input voltage is low, continuous conduction mode is used to maintain stable power delivery to the display, eliminating flicker
Solution Approach 2:
The converter monitors input voltage levels and uses this feedback to determine the appropriate operating mode. This feedback mechanism ensures that the display receives stable power under varying input conditions, preventing flicker while maintaining efficiency when possible
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 stabilizes battery power and prevents flicker in the display unit by converting input power into suitable first and second power supplies, ensuring continuous operation during calls by switching between discontinuous and continuous modes.
Implementation Method 1
a boost circuit boosting the input power to generate the first power and outputting the first power to the first output terminal
Implementation Method 2
a buck circuit bucking the input power to generate a second power and outputting the second power to a second output terminal
Data Source
AI summary
A DC-DC converter for converting an input power to generate a first power and for outputting the first power to a first output terminal, the DC-DC converter including: a resistor unit for electrically connecting a set resistor to the first output terminal when the voltage of input power is in a specific range, and a mobile communication terminal using the same. Here, the DC-DC converter is capable of reducing or removing a pulse skip mode by increasing a load of an output end if it is determined that the voltage of the input power is in the specific range, by sensing the input power.