Synchronous DC-DC Converter Adaptive Dead Time Control
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Solution Overview
Problem
Synchronous DC-DC converters face inefficiencies due to suboptimal dead time, leading to increased switching losses and reduced battery life, as the existing technologies fail to effectively manage the dead time interval between switching elements to prevent shoot-through and parasitic diode conduction.
Innovation Solution
A synchronous DC-DC converter design that includes a clock signal generator, gate driving part, and controller to generate delay clock signals and control signals, optimizing the dead time interval by using adaptive delay units and logic gates to prevent simultaneous switching of switching elements, thereby minimizing parasitic diode conduction and enhancing power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dead time is introduced to prevent simultaneous on-state of switching elements, then switching loss and stress are reduced, but power efficiency deteriorates due to extended off-state duration
Solution Approach 1:
The patent implements dynamic dead time adjustment by using a delay generator that adaptively modifies the dead time duration based on operating conditions. The controller dynamically changes the delay period between switching elements, transitioning from a fixed dead time to a variable dead time that optimizes performance across different load and frequency conditions, thereby resolving the contradiction between protection and efficiency.
Solution Approach 2:
The patent changes the dead time parameter from a fixed value to a variable value through the delay generator. By adjusting the delay period parameter based on operating conditions (such as load current and switching frequency), the system optimizes the balance between preventing shoot-through and minimizing power loss during the dead time interval.
2Use of energy by moving object
If the dead time is reduced to improve power efficiency, then energy loss decreases, but the risk of shoot-through and parasitic diode conduction increases
Solution Approach 1:
The patent employs feedback mechanisms where the controller monitors operating conditions and adjusts the dead time accordingly. The delay generator receives feedback about the switching state and load conditions, then dynamically modifies the dead time to maintain optimal values that prevent shoot-through while minimizing energy loss.
Solution Approach 2:
The system transitions from static dead time to dynamic dead time adjustment, where the delay period continuously adapts to operating conditions. This dynamic approach allows the system to use minimal dead time under light loads (improving efficiency) while automatically increasing dead time under heavy loads or during transient conditions (maintaining protection).
3Device complexity
If fixed dead time is used to simplify control, then device complexity is reduced, but power efficiency deteriorates due to inability to optimize under varying conditions
Solution Approach 1:
The patent implements a self-adjusting control system where the delay generator automatically modifies dead time based on its own monitoring of switching conditions. The controller serves itself by dynamically optimizing the dead time parameter without requiring external intervention or complex external control circuits, thereby maintaining relatively simple device architecture while achieving adaptive optimization.
Data Source
AI summary
Disclosed is a synchronous DC-DC converter including: a clock signal generator which generates a clock signal; a gate driving part which is connected to the clock signal generator and outputs a first delay clock signal and a second delay clock signal with respect to the clock signal; a switching part which is connected to the gate driving part and includes a first switching element and a second switching element which are complementarily switched according to each of the first delay clock signal and the second delay clock signal; and a controller which is connected to the switching part and generates a control signal which is usable by the gate driving part in order to control a dead time between the first switching element and the second switching element.