Flyback Power Converter Multi-Function Pin Detection
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Solution Overview
Problem
Current power conversion apparatuses with PWM control chips require multiple isolated detection pins for over temperature, over voltage, and over current protection, increasing production costs due to the need for separate function detections.
Innovation Solution
A flyback-based power conversion apparatus and method utilizing a control chip with a multi-function detection pin, assisted by a voltage-current detection auxiliary circuit, to perform AC input voltage detection, over temperature protection, and over voltage protection in separate phases, reducing the number of detection pins needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple isolated detection pins are used for over temperature, over voltage, and over current protection, then the detection functions are complete and reliable, but the production cost of the control chip increases
Solution Approach 1:
The patent applies multi-functionality by designing a single detection pin that can perform multiple detection functions (over temperature, over voltage, and over current protection) through different detection phases. The control chip uses one detection pin to sequentially execute different detection tasks by switching between detection modes, thereby reducing the number of pins required while maintaining comprehensive protection capabilities.
2Reliability
If various function detections are implemented through the PWM control chip, then the protection coverage is comprehensive, but the production cost increases
Solution Approach 1:
The patent merges multiple detection functions into a single detection pin by implementing a unified detection mechanism that can switch between different detection modes. The control chip integrates over temperature, over voltage, and over current detection capabilities within one pin, combining what would traditionally require separate pins into a single multi-functional interface.
3Measurement precision
If separate detection pins are used for each protection function, then the detection precision for each function is ensured, but the device complexity increases
Solution Approach 1:
The patent reduces device complexity by making the detection pin universal - capable of performing multiple detection functions sequentially. Instead of having separate dedicated pins for each protection function, the system uses one multi-functional pin that can be configured for different detection tasks through phase switching, thereby simplifying the overall chip structure while maintaining detection precision.
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
This approach allows a single multi-function detection pin to handle multiple protection functions, reducing manufacturing costs and enhancing the efficiency of power conversion while protecting the apparatus from damage due to over current, temperature, and voltage conditions.
Implementation Method 1
The transformer includes a primary winding, a secondary winding and an auxiliary winding, wherein a common polarity terminal of the primary winding of the transformer is configured to receive the alternating current (AC) input voltage
Implementation Method 2
An anode of the first diode is coupled to an opposite polarity terminal of the secondary winding of the transformer, and a cathode of the first diode is configured to generate the DC output voltage
Data Source
AI summary
A flyback-based power conversion apparatus and a power conversion method thereof are provided. By switching first and second detection switches disposed in a control chip and coupled to a multi-function pin of the control chip at different timings, the present invention applies a collocation of a voltage-current detection auxiliary circuit and a current detection circuit at a certain timing to execute a detection of the AC input voltage received by a flyback power conversion circuit, and the present invention applies a collocation of the auxiliary voltage-current detection circuit, an over temperature protection unit and an over voltage protection unit at another timing to execute detections of an over temperature protection and an over voltage protection. As the result, a single multi-function detection pin of the control pin is corresponding to a plurality of related function detections, so as to reduce the production cost of manufacturing the control chip.