Power Supply Error Detection via Frequency Comparison
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Solution Overview
Problem
Existing power supply systems face challenges in detecting input and load errors at low costs, particularly due to the diversification of power sources and the need for cost-effective methods.
Innovation Solution
A power supply apparatus with a transformer that isolates the primary and secondary sides, converting input voltage to output voltage through driving frequency control, includes a generation unit for pulse signals, a detection unit for frequency detection, and a determination unit that compares detected frequencies to stored information to identify input or load errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage detection circuit and current detection circuit are used to detect input and load errors, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the error detection function from separate voltage and current detection circuits and integrates it into the existing frequency detection mechanism. By utilizing the driving frequency information already present in the power supply system, the patent eliminates the need for additional detection circuits while maintaining error detection capability.
Solution Approach 2:
The frequency detection unit serves multiple functions: it monitors the driving frequency for output power control and simultaneously detects input voltage errors and load errors by comparing frequency deviations against predetermined thresholds. This multi-functional approach reduces overall system complexity.
2Reliability
If separate voltage detection and current detection circuits are implemented, then error detection capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the input voltage error detection and load error detection functions into a single frequency detection and comparison mechanism. By combining these detection capabilities into one integrated system rather than using separate circuits, manufacturing costs are reduced while maintaining comprehensive error detection.
3Adaptability or versatility
If driving frequency is controlled to change output voltage, then power supply adaptability is improved, but frequency detection precision requirements increase
Solution Approach 1:
The patent establishes predetermined threshold values for frequency comparison before operation begins. These thresholds are set to account for normal frequency variations during voltage control, providing a buffer that prevents false error detections while maintaining sensitivity to actual errors.
Solution Approach 2:
The patent changes the detection parameter from direct voltage or current measurement to frequency-based detection. By monitoring driving frequency deviations and comparing them against predetermined thresholds, the system achieves error detection with adequate precision for the intended application without requiring ultra-precise frequency measurement 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
This solution enables cost-effective detection of input and load errors by accurately determining frequency variations, allowing for timely error identification and prevention of operational issues in image forming apparatuses.
Implementation Method 1
a transformer configured to isolate a primary side from a secondary side and being configured to convert an input voltage into an output voltage different from the input voltage
Implementation Method 2
a generation unit configured to generate a pulse signal based on a voltage induced on the secondary side of the transformer
Data Source
AI summary
The power supply apparatus comprising a generation unit configured to generate a pulse signal, a memory unit configured to store information set in advance on the driving frequency, and a determination unit configured to determine an error of the input voltage and an error of a load, to a piece of the information stored in the memory unit, a driving frequency detected by the detection unit under a state where a load is connected to the convertor, and based on a result of comparing, to a piece of the information stored in the memory unit, a driving frequency detected by the detection unit under a state where the load is not connected to the convertor.