Converter Dead Time Control for Power Loss Reduction
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Solution Overview
Problem
In high-frequency power conversion converter circuits, existing dead time control systems fail to adaptively adjust dead time based on changing load conditions, leading to inefficiencies due to either excessive dead time under light loads or insufficient dead time under heavy loads, resulting in increased power loss and reduced converter efficiency.
Innovation Solution
A system and method that includes a controller capable of detecting over dead-time occurrences, calculating an initial dead time value, and adjusting it in real-time using a dead time resetter, based on parameters such as input and output voltages, output power, and switching frequency, to prevent arm short phenomena and maintain optimal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large dead time is set to prevent gate malfunction under light load conditions, then reliability is improved, but converter efficiency deteriorates due to excessive dead time
Solution Approach 1:
The dead time is changed from a fixed constant value to a dynamic variable that automatically adjusts based on operating conditions. The controller detects over dead-time occurrences and varies the dead time accordingly, making the system adaptive to different load conditions and frequency variations.
Solution Approach 2:
The system implements feedback control by detecting over dead-time conditions during converter operation and using this information to adjust the dead time setting. The controller continuously monitors the converter state and modifies the dead time to maintain optimal performance across varying operating conditions.
2Device complexity
If a fixed dead time is set in the dead time generating circuit, then device complexity is reduced, but adaptability deteriorates as the dead time cannot be varied with operating conditions
Solution Approach 1:
The dead time generating circuit is enhanced to provide dynamic dead time adjustment capability. The controller varies the dead time based on detected operating conditions, enabling the circuit to adapt to different load conditions and frequency variations without requiring complete circuit redesign.
Solution Approach 2:
The system changes the dead time parameter dynamically based on operating conditions. The controller detects over dead-time occurrences and adjusts the dead time parameter accordingly, allowing the same hardware circuit to operate optimally across a wide range of conditions by varying the time parameter.
Data Source
AI summary
Provided is a system of varying a dead time of a converter, including a converter including a plurality of semiconductor switches to which a dead time is applied during an alternate switching operation; and a controller controlling ON/OFF of the plurality of semiconductor switches and setting the dead time, wherein the controller varies the dead time during an operation of the converter. According to the present invention, an over dead-time may be detected and varied to an appropriate dead time, thereby minimizing power loss of the converter and increasing efficiency thereof.