Flyback Power Converter Multi-Purpose Circuit Protection
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Solution Overview
Problem
Household power converters often lack comprehensive protection mechanisms against abnormal operation conditions such as over-voltage, brownout, and over-temperature, which can lead to device damage or safety hazards.
Innovation Solution
A power converter with a flyback topology and a multi-purpose circuit that provides over-voltage protection (OVP), brownout protection, and over-temperature protection (OTP) using a quasi-resonant control scheme, valley detection, and a combination of resistors, thermistors, and diodes to regulate output voltage and detect abnormal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple protection mechanisms (OVP, brownout protection, OTP) are implemented in a power converter, then the reliability and safety of the power converter is improved, but the device complexity increases due to the need for multiple detection circuits and control logic
Solution Approach 1:
The patent implements a multi-purpose circuit that integrates multiple protection functions (over-voltage protection, brownout protection, over-temperature protection) into a single circuit module. This circuit uses a unified detection mechanism that monitors different parameters (voltage, temperature) and triggers appropriate protection responses, thereby providing comprehensive protection while minimizing the increase in device complexity through functional integration
2Reliability
If comprehensive protection mechanisms are added to the power converter, then the safety and reliability are improved, but the manufacturing cost and ease of manufacture deteriorate due to additional components and assembly steps
Solution Approach 1:
The patent merges multiple protection functions into a single multi-purpose circuit module that can be integrated into the power converter. By combining the detection and control logic for over-voltage, brownout, and over-temperature protections into one unified structure, the patent reduces the total number of discrete components and simplifies the manufacturing process while maintaining comprehensive protection capabilities
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
Effectively prevents damage to the power converter and ensures user safety by automatically shutting down the power conversion process during abnormal conditions, maintaining stable output voltage and temperature control.
Implementation Method 1
a combination of resistors, thermistors, and diodes to regulate output voltage and detect abnormal conditions
Implementation Method 2
a combination of resistors, thermistors, and diodes to regulate output voltage and detect abnormal conditions
Data Source
AI summary
A power converter capable of performing over-voltage protection and over-temperature protection converts an input voltage into an output voltage. A power switch is connected in series with a primary winding between the input voltage and an input ground. A power controller with a multi-function pin controls the power switch to control a winding current through the primary winding. The power converter has a multi-purpose circuit with first and second resistors, a rectifier and a thermistor. A connection node makes the first and second resistors connected in series between two ends of an auxiliary winding. The rectifier and the thermistor are connected in parallel between the multi-function pin and the connection node. The power controller can perform over-voltage protection and over-temperature protection via the multi-purpose circuit and the multi-function pin.