Transformer Voltage Detection Circuit Design
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Solution Overview
Problem
Existing power converter control circuits require additional feedback input terminals to detect input voltage, which complicates the design and increases the number of components needed.
Innovation Solution
A detection circuit that utilizes a current output circuit, current-to-voltage circuit, sample-and-hold circuit, and pulse generator to generate a pulse signal correlated to the input voltage applied to the transformer, eliminating the need for a separate feedback input terminal by using the voltage-detection terminal to detect the transformer's voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate feedback input terminal is added to detect input voltage, then voltage detection capability is improved, but device complexity increases
Solution Approach 1:
The voltage detection terminal is designed to serve dual purposes: detecting reflected voltage for regulation and detecting input voltage for control. By making the detection terminal universal, the patent eliminates the need for a separate feedback input terminal while maintaining both detection capabilities, thus reducing device complexity without sacrificing measurement precision
Solution Approach 2:
The patent combines the function of detecting reflected voltage and input voltage into a single voltage detection terminal. The detection circuit integrates multiple detection functions that were previously separated, merging the feedback input terminal's functionality with the voltage detection terminal to reduce the overall number of components and simplify the device structure
2Measurement precision
If additional feedback input terminals are added, then voltage detection accuracy is improved, but the number of components increases
Solution Approach 1:
The voltage detection terminal is designed to serve dual purposes: detecting reflected voltage for regulation and detecting input voltage for control. By making the detection terminal universal, the patent eliminates the need for a separate feedback input terminal while maintaining both detection capabilities, thus reducing device complexity without sacrificing measurement precision
Solution Approach 2:
The patent combines the function of detecting reflected voltage and input voltage into a single voltage detection terminal. The detection circuit integrates multiple detection functions that were previously separated, merging the feedback input terminal's functionality with the voltage detection terminal to reduce the overall number of components and simplify the device structure
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
Simplifies the power converter design by eliminating the need for additional feedback input terminals, reducing component count and improving reliability through direct correlation of the output signal with the input voltage.
Implementation Method 1
A current-to-voltage circuit is coupled to the current output circuit to generate a voltage signal in response to the current signal
Implementation Method 2
A sample-and-hold circuit generates an output signal by sampling the voltage signal. The operation of the sample-and-hold circuit provides low pass filtering to the output signal
Data Source
AI summary
A circuit and a method for detecting a voltage of a transformer are provided. The circuit includes a current output circuit coupled to a winding of a transformer to generate a current signal. A current-to-voltage circuit is coupled to the current output circuit to generate a voltage signal in response to the current signal. A sample-and-hold circuit generates an output signal by sampling the voltage signal. An input voltage is applied to the transformer. The output signal is correlated to the input voltage of the transformer.