High Voltage Power Supply Circuit Topology for Image Forming Apparatus
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Solution Overview
Problem
Conventional image forming apparatuses require multiple high voltage power supplies with different specifications, leading to increased cost and circuit size due to the number of components and independent power supply circuits, necessitating a reduction in the number of power supplies while maintaining high voltage output functionality.
Innovation Solution
A high voltage power supply configuration that includes a first output unit for a predetermined polarity, multiple rectification units to separate current paths for secondary and ITB cleaning units, allowing sharing of power supplies and reducing the number of components and circuit area by using a multistage voltage doubler rectification circuit and voltage resonance circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple independent high voltage power supplies are used for secondary transfer and ITB cleaning functions, then voltage output functionality is maintained, but device complexity and circuit size increase
Solution Approach 1:
A single high voltage power supply is designed to perform multiple functions by switching between different output modes. The power supply can output positive high voltage for secondary transfer, negative high voltage for ITB cleaning, and zero voltage for other operations, replacing what would traditionally require separate dedicated power supplies for each function.
Solution Approach 2:
The patent combines the secondary transfer power supply and ITB cleaning power supply into one integrated high voltage power supply unit. This merging reduces the total number of power supply circuits, decreases circuit board area, and simplifies the overall system architecture while maintaining all required voltage output capabilities.
2Manufacturing precision
If multiple independent high voltage power supplies are used, then voltage accuracy is maintained, but manufacturing cost increases
Solution Approach 1:
The single power supply incorporates voltage detection circuits and control mechanisms that ensure accurate voltage output regardless of whether it is operating in positive high voltage mode, negative high voltage mode, or zero voltage mode. This universal design maintains voltage accuracy requirements while reducing the cost of manufacturing multiple separate power supply units.
3Adaptability or versatility
If multiple independent high voltage power supplies are used, then functional independence is maintained, but circuit area increases
Solution Approach 1:
The patent integrates multiple power supply functions into a single circuit unit, significantly reducing the circuit board area occupied by power supply components. The merged design shares common elements such as voltage detection circuits, control logic, and power switching mechanisms, while maintaining functional independence through electronic control.
Solution Approach 2:
The patent transitions from a spatial arrangement of multiple independent power supply circuits to a temporal arrangement where a single power supply switches between different output states. This dimensional change from space to time allows functional independence to be maintained through time-multiplexed operation rather than spatial separation.
4Device complexity
If a single high voltage power supply is used, then device complexity is reduced, but control complexity increases
Solution Approach 1:
The power supply incorporates voltage detection circuits that continuously monitor the output voltage and provide feedback to the control mechanism. This feedback ensures that the power supply accurately switches between positive high voltage, negative high voltage, and zero voltage states, maintaining voltage accuracy while simplifying the overall device architecture.
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 configuration reduces the number of power supplies, decreases circuit size and cost, while maintaining the functionality of supplying high voltages, and allows for efficient toner transfer and cleaning processes without compromising voltage accuracy requirements.
Implementation Method 1
a plurality of rectification units connected to the output of the first high voltage output unit; a second high voltage output unit that is connected to one of the plurality of rectification units and outputs a high voltage having a polarity opposite to the predetermined polarity
Implementation Method 2
multistage voltage doubler rectification circuit
Implementation Method 3
voltage resonance circuit
Data Source
AI summary
A high voltage power supply including a first high voltage output unit that outputs a high voltage having a predetermined polarity, and including second and third high voltage output units that output a high voltage having a polarity opposite to the predetermined polarity. Rectification units that are connected to the first high voltage output unit separate a current path to the second high voltage output unit from a current path to the third high voltage output unit.