DC to DC Converter Current Equalization
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Solution Overview
Problem
DC to DC converters in display apparatuses generate heat due to unequal threshold voltages of switching elements, affecting their reliability and efficiency.
Innovation Solution
A DC to DC converter design that includes multiple switching elements and a controller to equalize duty ratios of currents flowing through these elements, using resistors, amplifiers, counters, and comparators to adjust control voltages and prevent heat generation by compensating for threshold voltage differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple switching elements are used for high-level voltage conversion, then the voltage conversion capability is improved, but heat generation increases due to threshold voltage differences
Solution Approach 1:
The patent adjusts the duty ratios of control signals for each switching element to compensate for threshold voltage differences. By dynamically changing the duty ratio parameter, the patent ensures equal current distribution across parallel switching elements, thereby preventing heat generation while maintaining high-level voltage conversion capability
Solution Approach 2:
The patent employs a controller that monitors and adjusts the duty ratios of control signals based on the operating conditions of switching elements. This feedback mechanism ensures that threshold voltage variations do not lead to unequal current distribution and heat generation, while maintaining effective high-level voltage conversion
2Stability of the object's composition
If duty ratios of control signals are not equal, then threshold voltage differences cause unequal current distribution, but equalizing duty ratios requires complex control mechanisms
Solution Approach 1:
The patent equalizes current distribution by adjusting the duty ratio parameter of control signals for each switching element. This parameter adjustment compensates for threshold voltage differences without requiring complex hardware modifications, achieving stable current distribution through controlled parameter variation
Solution Approach 2:
The controller in the patent performs multiple functions: it generates control signals for switching elements, adjusts duty ratios to compensate for threshold voltage differences, and ensures equal current distribution. This multi-functionality reduces the need for separate complex control mechanisms while achieving current equalization
Data Source
AI summary
A DC to DC converter includes: an input voltage source; an inductor connected to the input voltage source; a diode connected to the inductor; a capacitor connected to the diode; a plurality of switching elements connected to a node between the inductor and the diode in a parallel connection; and a controller configured to set duty ratios of currents flowing through the switching elements such that the duty ratios of the currents flowing through the switching elements are equal to each other.