Piezoelectric Transformer Power Supply Frequency Interference
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Solution Overview
Problem
High-voltage power supply units using piezoelectric transformers in electrophotographic image forming apparatuses face interference issues between driving frequencies, leading to decreased output precision and image quality, making it difficult to achieve downsizing and high image quality simultaneously without experimental measurements.
Innovation Solution
Incorporating a frequency-dividing circuit in the power supply apparatus that divides the operating frequency generated by a voltage-controlled oscillator to drive the piezoelectric transformer, ensuring the operating frequency is higher than the driving frequency, thereby reducing interference between piezoelectric transformers and enhancing image quality without experimental measures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If piezoelectric transformers are used to generate high voltage, then the power supply apparatus becomes compact and lightweight, but interference between driving frequencies decreases output precision and image quality
Solution Approach 1:
The patent divides the operating frequency into multiple segments by using a frequency-dividing circuit. The voltage-controlled oscillator generates an operating frequency that is then divided by a frequency-dividing circuit to produce a driving frequency, creating a frequency relationship that prevents interference while maintaining compact piezoelectric transformer design
Solution Approach 2:
The patent changes the frequency parameter relationship between the voltage-controlled oscillator and the piezoelectric transformer by ensuring the operating frequency is higher than the driving frequency. This parameter change eliminates interference between multiple piezoelectric transformers while preserving the benefits of using piezoelectric transformers for compactness and weight reduction
2Volume of moving object
If multiple piezoelectric transformers operate at close frequencies, then the power supply apparatus can be downsized, but interference between driving frequencies deteriorates image quality
Solution Approach 1:
The patent applies frequency segmentation by dividing the operating frequency from the voltage-controlled oscillator into a lower driving frequency for the piezoelectric transformer. This segmentation creates a frequency relationship that prevents harmful interference between multiple transformers while allowing compact design
Solution Approach 2:
The patent takes preliminary anti-action by designing the frequency relationship before interference occurs. The frequency-dividing circuit is configured to ensure the operating frequency is always higher than the driving frequency, preventing interference between multiple piezoelectric transformers before it can affect image quality
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
The solution effectively suppresses interference between driving frequencies, enabling downsizing and high image quality in the power supply apparatus, while eliminating the need for experimental measurements to achieve these results.
Implementation Method 1
generation of a high voltage using a flat, light-weight, high-output piezoelectric transformer
Implementation Method 2
a frequency-dividing circuit which divides the operating frequency generated by a voltage-controlled oscillator in at least one power supply circuit
Data Source
AI summary
A power supply apparatus with a plurality of power supply circuits each having a piezoelectric transformer and a voltage-controlled oscillator which generates a signal at an operating frequency used to drive the piezoelectric transformer in accordance with a control signal, includes a frequency-dividing circuit which divides the operating frequency generated by a voltage-controlled oscillator in at least one power supply circuit, and outputs a signal at a driving frequency to drive a piezoelectric transformer in the one power supply circuit. When at least one power supply circuit and remaining power supply circuits output voltages, the operating frequency generated by the voltage-controlled oscillator in the one power supply circuit is controlled to be higher than the operating frequency generated by the voltage-controlled oscillator in another power supply circuit.