Fly-Buck Converter Reference Voltage Slew Rate Control
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Solution Overview
Problem
Existing fly-buck converters for switched mode power supplies cannot independently configure the slew rates of the reference signal voltage, as the required voltage range is defined by the recipient circuit, limiting control accuracy and dynamic performance.
Innovation Solution
An isolated fly-buck converter with a voltage buffer and resistive elements configured to buffer and output a voltage indicative of the input voltage, allowing independent control of rising and falling slew rates through separate resistive paths for charging and discharging the capacitive elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fly-buck converter is used to generate reference voltage, then power conversion is achieved, but the slew rates of the reference signal voltage cannot be independently configured
Solution Approach 1:
The patent divides the single reference voltage generation function into separate charging and discharging paths with independent slew rate control. The charging path includes a first resistive element and first capacitive element, while the discharging path includes a second resistive element and second capacitive element. This segmentation allows independent configuration of rising and falling slew rates without increasing overall system complexity.
Solution Approach 2:
The patent implements dynamic slew rate control by using different resistive and capacitive elements for charging and discharging phases. The first and second resistive elements can have different resistance values, and the first and second capacitive elements can have different capacitance values, enabling independent optimization of rising and falling edge rates according to specific application requirements.
2Measurement precision
If the voltage range is defined by the recipient circuit, then compatibility is ensured, but control accuracy is limited
Solution Approach 1:
The patent enables precise control of reference voltage parameters including slew rates, voltage levels, and timing characteristics through independent selection of resistive and capacitive element values. The charging path uses a first resistive element and first capacitive element with specific values to achieve precise rising edge control, while the discharging path uses a second resistive element and second capacitive element for precise falling edge control, maintaining accuracy across different voltage ranges.
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
Enables precise control of the reference signal voltage with independently configurable slew rates, improving the dynamic performance and accuracy of switched mode power supplies.
Implementation Method 1
a first rectifying element that is connected to the secondary winding so as to prevent current flowing through the secondary winding during the forward phase
Implementation Method 2
the input voltage sensing circuit comprising a second capacitive element and a second rectifying element connected in series, the input voltage sensing circuit being connected across the secondary winding such that the second rectifying element prevents current from flowing through the input voltage sensing circuit during the fly-buck phase
Implementation Method 3
wherein the output of the voltage buffer is connected to ground via a first resistive element in series with a parallel combination of a second resistive element and a third capacitive element
Data Source
AI summary
An isolated fly-buck converter is provided for converting an input voltage to an output voltage, and for generating a voltage indicative of the input voltage. The isolated fly-buck converter comprises on its secondary side an input voltage sensing circuit for generating the voltage indicative of the input voltage, the input voltage sensing circuit comprising a capacitive element and a rectifying element connected in series. The input voltage sensing circuit is connected across a secondary winding of the isolated fly-buck converter such that the rectifying element prevents current from flowing through the input voltage sensing circuit during the fly-buck phase of operation of the converter. The input voltage sensing circuit also has a voltage buffer arranged to buffer a voltage which is indicative of a sum of the output voltage of the converter and the voltage over the capacitive element, and output the buffered voltage or a voltage based on the buffered voltage as the voltage that is indicative of the input voltage. The output of the voltage buffer is connected to ground via a first resistive element in series with a parallel combination of a second resistive element and a third capacitive element.