Flyback Power Converter Multi-Function Detection Pin
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current power conversion apparatuses require multiple detection pins for over temperature, over voltage, and over current protection, increasing the cost and complexity of PWM control chips due to their single-function design.
Innovation Solution
A flyback-based power conversion apparatus with a multi-function detection pin and a detection auxiliary circuit that synchronously performs over temperature and over voltage protection using a shared detection pin, reducing the need for multiple detection pins and circuitry by utilizing a thermistor and resistors to adjust detection voltages based on environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple independent detection pins are used for over temperature, over voltage, and over current protection, then detection reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements a multi-function detection pin that can perform over temperature protection (OTP), over voltage protection (OVP), and over current protection (OCP) detection through a single pin. The detection auxiliary circuit switches between different detection modes using control signals, allowing one pin to replace multiple independent detection pins while maintaining comprehensive protection functionality
Solution Approach 2:
The patent merges multiple detection functions (OTP, OVP, OCP) into a unified detection system that shares common circuitry including the detection pin, comparator, and control logic. The detection auxiliary circuit combines temperature sensing, voltage detection, and current detection pathways that converge to a single detection pin interface, reducing overall system complexity
2Reliability
If multiple independent detection pins are used for protection functions, then detection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The detection pin is designed to universally handle multiple protection detection tasks through software-controlled switching rather than hardware multiplication. The same physical pin and associated circuitry are reused across different protection functions, directly reducing component count and manufacturing cost while preserving detection accuracy through dedicated detection pathways for each function
Solution Approach 2:
The patent changes the operational parameters of the detection pin by switching between different detection modes (temperature, voltage, current) based on system state. The detection auxiliary circuit adjusts its configuration dynamically, changing which sensing elements are active and how the detection voltage is generated, allowing one pin to adapt to multiple detection requirements without sacrificing accuracy
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 allows for simultaneous detection and protection against over temperature, over voltage, and over current, reducing the overall cost of the control chip while maintaining effective protection mechanisms, thereby improving the efficiency and cost-effectiveness of power conversion.
Implementation Method 1
utilizing a thermistor and resistors to adjust detection voltages based on environmental conditions
Implementation Method 2
The flyback power conversion circuit receives an input voltage and converts the input voltage in response to a pulse width modulation (PWM) signal, so as to generate and provide a direct current (DC) output voltage
Data Source
AI summary
A power conversion apparatus including a flyback power conversion circuit, a control chip and a detection auxiliary circuit is provided. The flyback power conversion circuit receives and converts an input voltage into a DC output voltage. The control chip generates a PWM signal in response to a power supplying requirement to control the operation of the flyback power conversion circuit, wherein the control chip has a single multi-function detection pin. The detection auxiliary circuit assists the control chip to obtain a first detection voltage via the multi-function detection pin, such that the control chip performs a detection of an over temperature protection (OTP) and a detection of an over voltage protection (OVP) synchronously according to the first detection voltage. The first detection voltage is related to the DC output voltage or a thermal voltage of an environment temperature.