Resonant Power Converter Dead-Time Control for Load Changes
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Solution Overview
Problem
Existing power converters experience a decrease in power conversion efficiency when the state of the load changes.
Innovation Solution
A power converter design incorporating a first DC terminal, a second DC terminal, a power converter circuit with parallel-connected switching elements, bidirectional switches, resonant capacitors, and resonant inductors, along with a controller that performs control operations to manage dead times and charge/discharge a regenerative capacitor based on detected potential thresholds, ensuring efficient power conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional power converter circuits are used, then basic power conversion function is achieved, but power conversion efficiency decreases when load state changes
Solution Approach 1:
The patent implements dynamic control of switching elements by adjusting dead time based on detected current directions. The control unit dynamically modifies the timing of switching element operations in response to changing load conditions, enabling the circuit to adapt its behavior and maintain optimal efficiency across different operating states.
Solution Approach 2:
The patent incorporates a detection mechanism that monitors current flow directions through the coil and provides feedback to the control unit. This feedback enables the system to sense load state changes and adjust its operation accordingly, preventing efficiency degradation when operating conditions vary.
2Loss of energy
If switching elements operate without coordinated dead time control, then circuit operation is simple, but power conversion efficiency decreases
Solution Approach 1:
The control unit pre-establishes dead time intervals between the activation of different switching elements before actual power switching occurs. This preliminary timing coordination prevents simultaneous conduction of opposing switches, eliminating short-circuit risks and reducing energy losses without requiring complex real-time decision-making during operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances power conversion efficiency by maintaining optimal operation across varying load states through advanced control mechanisms.
Implementation Method 1
the controller performs a first control operation. The first control operation includes causing a high-level period of a control signal for each of the plurality of bidirectional switches to overlap with the dead time
Implementation Method 2
The regenerative capacitor has a third terminal and a fourth terminal. The third terminal of the regenerative capacitor is connected to either the first DC terminal or the second DC terminal
Implementation Method 3
The plurality of bidirectional switches are provided one to one for the plurality of switching circuits. Each of the plurality of bidirectional switches has a first terminal thereof connected to the connection node between the first switching element and the second switching element
Data Source
AI summary
In a power converter, a controller performs a first control operation including causing a high-level period of a control signal for each bidirectional switch, corresponding to one of a plurality of switching circuits, out of a plurality of bidirectional switches, to overlap with a dead time and setting a beginning of the high-level period at a point in time earlier than a beginning of the dead time by an additional time. If a potential detected at a fourth terminal of a regenerative capacitor is less than a first threshold value, the controller performs a second control operation including controlling the plurality of bidirectional switches to raise a potential at the fourth terminal of the regenerative capacitor. If the potential detected is greater than a second threshold value, the controller controls the plurality of bidirectional switches to lower the potential at the fourth terminal of the regenerative capacitor.