Resonant Converter Pulse Frequency Modulation Controller
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Solution Overview
Problem
General resonant converters face challenges in quickly controlling input power during abnormal conditions like overloads or output terminal shorts due to delay times in low pass filters, leading to suboptimal drive stability.
Innovation Solution
A resonant converter design incorporating a square wave generator, resonator, and output unit with a pulse frequency modulation controller that compares voltages and adjusts switch frequencies to manage power effectively, preventing circuit damage during high-power inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a low pass filter is used to acquire average input power, then measurement precision is improved, but response speed deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the relationship between rectified voltage and input power in a lookup table during normal operation. When abnormal conditions occur, the controller can immediately query the pre-prepared table without performing real-time complex calculations, thus achieving both measurement precision and fast response speed simultaneously.
Solution Approach 2:
The patent implements dynamics by switching between different control strategies based on operating conditions. During normal operation, the system uses standard power measurement methods. When abnormal conditions are detected (such as overload or short circuit), the system dynamically transitions to using the pre-calculated lookup table approach, optimizing the response speed while maintaining measurement accuracy.
2Speed
If switching frequency is increased to quickly control input power, then response speed is improved, but drive stability deteriorates
Solution Approach 1:
The patent uses preliminary action by pre-calculating the appropriate switching frequencies and duty cycles for various input power levels and storing them in a lookup table. When high power input is detected, the controller can immediately retrieve the pre-determined optimal switching parameters without real-time calculation, achieving fast response while maintaining drive stability through pre-optimized parameters.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting switching frequency and duty cycle based on the retrieved lookup table data. The system changes these parameters according to the current operating conditions, allowing fast response to high power inputs while maintaining stability through carefully selected parameter values that were pre-optimized for different operating scenarios.
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 enables stable operation and prevents circuit damage during high-power inputs or overloads by quickly processing changes in input power, improving drive stability compared to traditional resonant converters.
Implementation Method 1
a resonator including a first coil of a primary coil of a transformer, and generating a resonance waveform corresponding to the first square wave
Implementation Method 2
a transformer, and maintains the DC output voltage that is output through an output terminal coupled to a secondary coil of the transformer
Data Source
AI summary
A resonant converter includes a square wave generator including a first switch and a second switch, and generating a first square wave corresponding to an input voltage by alternately turning on/off the first and second switches; a resonator including a first coil of a primary coil of a transformer, and generating a resonance waveform corresponding to the first square wave; and an output unit including a second coil of a secondary coil of the transformer, and outputting a voltage corresponding to a current generated in the second coil corresponding to the resonance waveform. The square wave generator includes a pulse frequency modulation controller for turning on/off the first and second switches, comparing a first voltage linearly increased while the second switch maintains the turn-on state and a second voltage corresponding to an integration value on the time of the current flowing to the second switch when the second switch is turned off, and changing on/off drive frequencies of the first and second switches according to a comparison result. Therefore, a resonant converter driven with safety is realized.