Galvanically Isolated DC/DC Converter Adaptation Interval Control
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Solution Overview
Problem
Previous DC/DC converters experience unsatisfactory response time and undesired voltage peaks in the first side converter circuit when switching between power transfer states, leading to inefficient power absorption during reverse power transfer.
Innovation Solution
A galvanically isolated DC/DC converter design that alternates between two power transfer states, with the first side converter circuit being controlled to close the switch of one switching element prior to the beginning of each power transfer state, ensuring smooth current flow and reducing parasitic capacitances and inductances, thereby minimizing voltage peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the second side converter circuit switches between power transfer states, then power is transferred from the second side to the first side, but undesired voltage peaks occur in the first side converter circuit
Solution Approach 1:
The switch of the respectively other switching element is closed for an adaptation interval prior to the beginning of the power transfer state. This preliminary action prepares the first side converter circuit by establishing appropriate current flow paths before the voltage peaks can occur during state switching, thereby reducing the harmful voltage peaks while maintaining efficient power transfer
2Speed
If the switching elements operate without adaptation interval, then the circuit structure is simpler, but the response time of the first side converter circuit is unsatisfactory
Solution Approach 1:
The adaptation interval serves as a preliminary action period where the switch is closed before the power transfer state begins. This prepares the circuit in advance, improving the response time of the first side converter circuit. The control complexity is managed by implementing this as a timed interval in the switching control logic, which adds minimal complexity while significantly improving response performance
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
The solution improves power absorption properties and reduces voltage peaks in the first side converter circuit, ensuring stable and efficient power transfer from the second side to the first side DC terminals.
Implementation Method 1
a transformer circuit (30), which in turn is coupled to a second side converter circuit (240)... Via the transformer circuit (30), galvanic isolation between the pair of first side DC terminals (10) and the pair of second side terminals (60) is achieved
Data Source
AI summary
A galvanically isolated DC/DC converter includes a first and a second side converter circuit coupled between a pair of first side DC terminals and a pair of second side DC terminals, respectively. The first side converter circuit has a first and a second switching element, each including a switch and a diode. When the DC/DC converter is in power transfer operation from the second side DC terminals to the first side DC terminals, the second side converter circuit alternates between two power transfer states. A conductive state of the diode of one of the first and second switching elements is the result of one of the two power transfer states. The first side converter circuit is controlled such that the switch of the respectively other of the first and second switching elements is closed for an adaptation interval before the one of the two power transfer states starts.