Power Apparatus Voltage Error Integral Monitoring
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Solution Overview
Problem
In digitally controlled switching power supplies, it is difficult for users to detect deterioration of the power circuit before a breakdown occurs, leading to unexpected failures and increased maintenance costs.
Innovation Solution
A power apparatus that includes a power circuit, a memory, and a processor to calculate an integral value of the error between the output voltage and a target voltage, determine a duty ratio, and generate a warning signal when the calculated slope exceeds a threshold, allowing for early detection of power circuit deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional power supply monitoring is used, then the power supply operates normally, but deterioration cannot be detected before breakdown
Solution Approach 1:
The system performs preliminary detection of power circuit deterioration by monitoring the integral value during normal operation before breakdown occurs. The processor calculates the integral value of voltage error and compares it against thresholds to detect deterioration trends in advance, enabling preventive maintenance before actual failure happens.
Solution Approach 2:
The system implements feedback monitoring by continuously measuring the integral value of the difference between actual output voltage and target voltage, then feeding this information back to the processor for analysis. The processor compares the calculated integral value against reference thresholds and generates warnings when deterioration is detected, creating a closed-loop monitoring system.
2Reliability
If no deterioration detection system is implemented, then the device complexity is low, but unexpected failures occur increasing maintenance costs
Solution Approach 1:
The power supply system performs self-diagnosis by using its own existing voltage error signal (already present during normal PWM control operation) to detect deterioration. The processor calculates the integral value of the voltage error that already exists in the control loop, eliminating the need for separate dedicated sensing components and keeping the system self-sufficient.
Solution Approach 2:
The system detects deterioration by monitoring changes in the integral value parameter over time. The processor calculates the integral value at different operating points and compares these values to detect trends indicating deterioration. This parameter-based approach transforms an existing control parameter (voltage error integral) into a diagnostic indicator without adding physical sensors.
Data Source
AI summary
A power apparatus includes a power circuit configured to receive an input voltage and generate an output voltage, a memory, and a processor coupled to the memory and the processor configured to calculate an integral value of an error between the output voltage and a target voltage of the power circuit, calculate a duty ratio based on the integral value, the power circuit being controlled according to the calculated duty ratio so that the output voltage becomes the target voltage, calculate a slope of the integral value with respect to an output current of the power circuit, and generate a first warning signal when the calculated slope exceeds a first warning threshold in a case where the calculated slope is different from an initial value.