Power Converter Dead-Time Control for Efficiency
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Solution Overview
Problem
Existing power converters face challenges in maintaining high power conversion efficiency across a wide variable input-power and output-power range, particularly during low-load operations, due to difficulties in properly adjusting dead time to prevent short-circuit currents and optimize efficiency.
Innovation Solution
A power converter with a feedback controller and dead-time determiner that adjusts dead time based on boundary conditions related to input and output power, operating in either continuous or discontinuous conduction modes, to maximize power conversion efficiency and prevent short-circuit currents across varying voltage ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dead time is increased to prevent short-circuit currents, then reliability is improved, but power conversion efficiency deteriorates
Solution Approach 1:
The dead time is made dynamically adjustable rather than fixed. The control unit varies the dead time duration based on operating conditions (input voltage, output voltage, load current) to optimize both reliability and efficiency at different operating points
Solution Approach 2:
The dead time parameter is changed according to operating conditions. The control unit adjusts the dead time duration based on measured input voltage, output voltage, and load current to prevent short-circuit currents while minimizing efficiency loss
2Loss of energy
If dead time is decreased to improve power conversion efficiency, then energy loss is reduced, but reliability deteriorates due to risk of short-circuit currents
Solution Approach 1:
The dead time is dynamically adjusted based on real-time operating conditions. The control unit calculates appropriate dead time duration considering input voltage, output voltage, and load current to maintain both efficiency and reliability
Solution Approach 2:
The control unit uses feedback from voltage and current sensors to continuously adjust the dead time. Measured operating parameters are fed back to the control unit which modifies dead time settings to prevent short-circuits while optimizing efficiency
3Device complexity
If constant dead time is used for all operating conditions, then device complexity is reduced, but adaptability deteriorates across wide voltage ranges
Solution Approach 1:
The dead time control transitions from static to dynamic. The control unit adjusts dead time duration based on measured operating conditions (input voltage, output voltage, load current) to adapt to wide voltage ranges and load variations
Solution Approach 2:
The dead time parameter is varied according to operating conditions. The control unit changes dead time duration based on input voltage, output voltage, and load current levels to optimize performance across different operating points
Data Source
AI summary
In a power converter, a feedback controller feedback controls a manipulated variable based on a first electrical parameter depending on input power and a feedback controlled variable determined for output power. A dead-time determiner determines a value of the dead time as a function of a boundary condition variable depending on at least one of the input power and the output power. The boundary condition represents a reference for determining whether the power converter is operating in a continuous conduction mode or a discontinuous conduction mode. The continuous conduction mode is designed for a current to be continuously flowing through an inductor included in the power converter or a load as an inductor current. The discontinuous conduction mode is designed for the inductor current to be discontinuously flowing through the inductor.