Multi-Phase Power Converter Voltage Stability
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Solution Overview
Problem
Conventional power converters struggle to maintain a stable output voltage across a wide input voltage range, leading to insufficient power delivery to electronic components, especially when the input voltage fluctuates between 40V and 54V.
Innovation Solution
A power converter design featuring multiple phase conversion circuits in cascade connection, including main switches, capacitors, freewheeling switches, and bridge arm circuits, controlled by a control circuit to maintain output voltage stability and efficiency, with adjustable duty cycles and phase differences to manage input voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the input voltage range is increased from 12V to 54V to reduce bus loss and cost, then the power conversion efficiency is improved, but the output voltage stability deteriorates
Solution Approach 1:
The patent implements dynamic duty cycle adjustment for the main switches in each phase conversion circuit. The control circuit dynamically changes the duty cycle based on the input voltage magnitude to maintain stable output voltage. When input voltage is high (40V-54V), the duty cycle is reduced; when input voltage is low, the duty cycle is increased, thereby compensating for input voltage fluctuations and maintaining output stability.
Solution Approach 2:
The patent changes the operating parameters of the power converter by adjusting the duty cycle of main switches according to input voltage conditions. This parameter change allows the converter to adapt to wide input voltage ranges (40V-54V) while maintaining consistent output voltage, resolving the contradiction between energy efficiency and output stability.
2Device complexity
If the duty cycle of main switches is fixed to simplify control, then the device complexity is reduced, but the soft-starting capability is lost
Solution Approach 1:
The patent implements preliminary action by gradually increasing the duty cycle of main switches from zero during the startup phase. This soft-starting approach prevents inrush current and voltage spikes, protecting the circuit components. The control circuit automatically adjusts the duty cycle in a controlled manner during startup, then transitions to normal operation with dynamic duty cycle adjustment based on input voltage.
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 effectively maintains the output voltage at a set value, enhancing power conversion efficiency and enabling soft-starting of the output voltage, ensuring reliable power delivery to electronic components despite input voltage variations.
Implementation Method 1
Each of the N phase conversion circuits includes a first main switch, a second main switch, a second capacitor, a freewheeling switch, an inductor and a bridge arm circuit
Implementation Method 2
A first terminal of the first capacitor is electrically connected with the second positive terminal. A second terminal of the first capacitor is electrically connected with the second negative terminal
Data Source
AI summary
A power converter includes a first positive terminal, a first negative terminal, a second positive terminal, a second negative terminal, a first capacitor and N phase conversion circuits. The first capacitor is connected between the second positive terminal and the second negative terminal. Each phase conversion circuit includes a first main switch, a second main switch, a second capacitor, a freewheeling switch, an inductor and a bridge arm circuit. The first main switch is electrically connected with the first positive terminal. The second capacitor is electrically connected with the first main switch and the second main switch. The freewheeling switch is electrically connected between the second main switch and the second negative terminal. The inductor is electrically connected with the second main switch. The second main switch is also electrically connected with the first main switch of an adjacent phase conversion circuit.