Power Supply Frequency Synchronization for Image Forming Apparatus
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Solution Overview
Problem
Existing power supply apparatuses for image forming devices face frequency interference issues due to unsynchronized output power frequencies, leading to image irregularities and abnormalities.
Innovation Solution
A power supply apparatus that includes a clock signal generating unit, a calculating unit for synchronizing first, second, and third frequencies, an AC voltage output unit, and a DC voltage output unit, which generates synchronized AC and DC voltages to prevent frequency interference and ensure stable output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AC voltage frequency and drive frequency of the oscillation circuit are controlled to be integral multiples, then banding based on frequency interference is prevented, but frequency interference may still occur in the output power because the frequencies are not synchronized
Solution Approach 1:
The patent merges the frequency control of the AC voltage output unit and the oscillation circuit by introducing a common clock signal. The calculating unit computes a synchronized frequency that is an integral multiple of both the AC voltage frequency and the oscillation circuit drive frequency, ensuring both frequencies are harmonized to a single reference clock, thereby eliminating frequency interference while maintaining system reliability
Solution Approach 2:
The patent introduces a clock signal and a calculating unit as intermediaries between the AC voltage output unit and the oscillation circuit. The clock signal serves as a common reference, and the calculating unit acts as a mediator that computes the synchronized frequency relationship, ensuring that both output frequencies are coordinated without direct coupling, thus preventing frequency interference
2Reliability
If frequency synchronization is implemented to prevent image abnormalities, then image quality improves, but the device complexity increases due to additional clock signal generation and frequency calculation units
Solution Approach 1:
The clock signal generating unit and calculating unit serve multiple functions: they generate the clock signal, calculate the synchronized frequency, and provide reference frequencies to both the AC voltage output unit and the oscillation circuit. This multi-functional design achieves frequency synchronization without requiring separate control circuits for each frequency source, thereby improving image quality while limiting the increase in device complexity
3Device complexity
If the frequencies are not synchronized, then the device complexity is reduced, but frequency interference occurs leading to image abnormalities
Solution Approach 1:
The patent applies preliminary action by calculating the synchronized frequency in advance using the calculating unit before the AC voltage and oscillation signals are generated. The clock signal and calculated frequency relationship are established beforehand, ensuring that when the output units operate, frequency interference is already prevented, thus eliminating image abnormalities without requiring complex real-time adjustment mechanisms
Data Source
AI summary
A power supply apparatus includes a clock signal generating unit that generates a clock signal with a clock frequency, a calculating unit that calculates a frequency at which a first frequency, a second frequency, and a third frequency are synchronized based on the clock frequency, an AC voltage output unit that outputs an AC voltage of the second frequency based on a signal of the first frequency, a DC voltage output unit outputting a DC voltage based on a signal of the third frequency, and an output unit that outputs based on the AC voltage and the DC voltage.