Multi-Level Converter Mode Switching for Efficiency
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Solution Overview
Problem
Existing DC-DC converters face inefficiencies due to detection/response delays and incompatibilities between different topologies, limiting the effectiveness of efficiency control schemes across various converter types, particularly between two-level and multi-level converter topologies.
Innovation Solution
A power converter system that switches between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) using a control circuit to manage output pulses across multiple input-side voltage levels, allowing for adaptive operation and increased charge per pulse in DCM compared to CCM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If efficiency control schemes are applied to DC-DC converters, then efficiency is improved, but detection/response delays and topology incompatibilities worsen the effectiveness of the control scheme
Solution Approach 1:
The patent changes the operating parameters of the converter by switching between CCM and DCM based on load conditions. In DCM, the converter delivers more charge per pulse, which is particularly effective at light loads where detection delays have less impact. This parameter change allows the system to maintain efficiency across different operating conditions despite the inherent detection/response delays in the control circuit.
2Loss of energy
If efficiency control schemes are designed for specific DC-DC converter topologies, then efficiency is improved for that topology, but compatibility across different topologies deteriorates
Solution Approach 1:
The patent creates a universal efficiency control scheme that works across different DC-DC converter topologies by using mode switching between CCM and DCM. The control method is topology-agnostic, focusing on the conduction mode rather than specific circuit architecture. This allows the same control strategy to be applied to two-level, three-level, and other multi-level converter topologies, achieving both efficiency improvement and broad compatibility.
3Stability of the object's composition
If CCM operation is used, then continuous power delivery is maintained, but charge per pulse is reduced compared to DCM
Solution Approach 1:
The patent dynamically switches between CCM and DCM based on load conditions and mode switch triggers. At light loads, DCM is activated to deliver more charge per pulse, improving efficiency. At heavier loads, CCM is maintained for continuous power delivery. This dynamic adaptation allows the system to optimize between continuous operation and charge per pulse delivery depending on the operating conditions.
Data Source
AI summary
A power converter device includes a set of switches configured to switch between at least three input-side voltage levels to provide output pulses. The power converter device also includes a control circuit for the set of switches, wherein the control circuit configured to selectively switch the power converter device between a continuous conduction mode of operation (CCM) having a first charge per pulse and a discontinuous conduction mode of operation (DCM) having a second charge per pulse, the second charge per pulse being greater than the first charge per pulse.