Power Conversion Overpower Protection via Current Counting
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Solution Overview
Problem
Conventional power conversion apparatuses can output abnormal large currents due to open or short circuits, leading to excessive voltage and risk of damage to the apparatus or internal components.
Innovation Solution
A power conversion apparatus incorporating a transformer, power switch, resistors, comparison units, and a PWM control unit that monitors feedback signals to count excessive current occurrences and stops switching when a predetermined count is reached, preventing continuous high voltage or current output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power conversion apparatus continuously outputs high voltage or current, then the power output is maintained, but the risk of damaging the apparatus or load components increases due to abnormal temperature increase
Solution Approach 1:
The patent implements a feedback mechanism where a feedback signal related to the load status is continuously monitored. A comparison unit compares this feedback signal with a reference voltage to generate a comparison signal that triggers the counting unit when abnormal conditions are detected, creating a closed-loop control system that adjusts power output based on actual load conditions
Solution Approach 2:
The patent employs preliminary action by counting the number of times the feedback signal exceeds the reference voltage before actually stopping the power switch. This predetermined counting threshold allows the system to tolerate transient abnormalities while preventing continuous abnormal operation, enabling protective action before damage occurs
2Reliability
If the power conversion apparatus monitors and counts excessive current occurrences, then the protection capability is improved, but the device complexity increases due to additional comparison units and counting units
Solution Approach 1:
The patent divides the monitoring function into separate modular units: a comparison unit that evaluates the feedback signal against reference voltage, and a counting unit that tallies abnormal occurrences. This segmentation allows each unit to perform its specific function independently, making the overall system more manageable and maintainable despite increased complexity
Solution Approach 2:
The patent introduces a counting unit as an intermediary between the comparison unit and the PWM control unit. Rather than directly stopping the power switch when abnormal conditions occur, the counting unit mediates by accumulating evidence of abnormalities and only triggering protection when a threshold is reached, enabling more intelligent decision-making
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 by disabling the power switch when excessive current is detected, ensuring the apparatus and connected electronics are protected from continuous high voltage or current output.
Implementation Method 1
The transformer has a primary side and a secondary side, a first end of the primary side is configured to receive an input voltage, and the secondary side is configured to provide an output voltage
Implementation Method 2
a control terminal of the power switch receives a PWM signal
Data Source
AI summary
A power conversion apparatus and an over power protection method thereof are provided. A number of times a sensing voltage exceeding a reference voltage is counted, so as to determine whether to disable a power switch in the power conversion apparatus according to the number of times the sensing voltage exceeding the reference voltage, in which the sensing voltage corresponds to a current flowing through the power switch on a resistor.