Power Converter Switching Sections Node Voltage Detection
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Solution Overview
Problem
Power converters face inefficiencies due to significant gate drive losses at low loads and resistive losses at high loads, which are not adequately minimized by existing technologies.
Innovation Solution
A power converter design featuring a controller-driven switching system with alternating sections of switches, where a detection circuit measures node voltage to deactivate the second switching section at high loads, reducing overall losses by minimizing the use of switches during low-load operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If switching sections are deactivated at low loads to reduce gate drive losses, then low-load efficiency improves, but the converter's ability to handle high loads is reduced
Solution Approach 1:
The detection circuit provides continuous feedback on inductor current levels to the control logic. When current exceeds a predetermined threshold, the system activates additional switching sections to handle the increased load. When current drops below the threshold, sections are deactivated to reduce losses. This feedback mechanism ensures the converter automatically adapts its configuration to match actual load demands, maintaining both efficiency and load handling capability.
Data Source
AI summary
A power converter (10) includes a controller (12) configured to generate a switching signal. A first section (14) is coupled to the controller (12) and has first and second switches (26,30). The first section (14) is configured such that the first and second switches (26,30) operate in an alternating manner in response to the switching signal. A second section (16) is coupled to the controller (12) and has third and fourth switches (50,54). The second section (16) is configured such that the third and fourth switches (50,54) operate in an alternating manner in response to the switching signal. The first and second sections (14,16) are coupled to a node (88). A detection circuit (18) is coupled to the second section (16). The detection circuit (18) is configured to measure a voltage at the node between the operation of the third and fourth switches (50,54) and deactivate the second section when the voltage is above a predetermined threshold.