Digital High Voltage Control Using ASIC and PWM
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Solution Overview
Problem
Conventional high voltage power supplies for image forming apparatuses employ analog control methods, leading to errors due to component defects, increased manufacturing costs, and difficulty in controlling output voltage, while requiring a large number of components and complex structures.
Innovation Solution
An ASIC chip-based digital control method is used to generate high voltage, incorporating a switching part, digital controlling part, and digital interfacing part to control the output voltage through a power transforming part, allowing for precise digital control and reduced component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an analog control method is used in conventional high voltage power supplies, then the control of output voltage is difficult and component defects cause errors, but the structure is simpler without digital interfaces
Solution Approach 1:
The patent replaces the analog control system with a digital control system. The digital controller receives PWM signals and generates digital control signals to drive the power transforming part, substituting analog voltage control with digital pulse width modulation control. This improves measurement precision and control accuracy while managing complexity through integrated digital circuitry.
Solution Approach 2:
The patent changes the control parameter from analog voltage levels to digital PWM duty cycles. The digital controller adjusts the duty cycle of PWM signals to control the output voltage, providing precise control through digital parameter adjustment rather than analog voltage variation. This enables accurate voltage control through programmable digital parameters.
2Ease of manufacture
If conventional analog control components are used, then manufacturing costs increase and component count increases, but the design is more straightforward without digital integration
Solution Approach 1:
The patent merges the digital controller, PWM signal generator, and power control circuitry into an integrated digital control system. The digital controller unit combines multiple functions (signal reception, processing, and switching control) into a single integrated component, reducing the total component count and simplifying manufacturing assembly while managing internal complexity through integration.
Solution Approach 2:
The digital controller serves multiple functions: receiving PWM control signals, generating digital control signals, driving the power transforming part, and providing feedback control. This multi-functional integration reduces the need for separate dedicated components for each function, lowering overall system complexity and manufacturing cost.
3Quantity of substance
If a digital control method is implemented with ASIC chip, then output voltage control precision improves and component count reduces, but the device complexity increases due to digital circuit integration
Solution Approach 1:
The patent implements an ASIC (Application-Specific Integrated Circuit) that integrates the digital controller, PWM generation logic, and power control functions into a single chip. This merging of multiple digital control functions into one integrated circuit dramatically reduces the component count on the PCB while managing complexity through sophisticated internal circuit integration.
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 digital control method enables efficient and precise control of high voltage output, reducing component count, manufacturing time, and heat generation, while allowing for compact design and flexible control of multiple channels.
Implementation Method 1
a power transforming part to transform a low voltage into a high voltage
Data Source
AI summary
An apparatus to generate a high voltage includes an outputting part having a power transforming part formed with a primary and a secondary coil, a switching part to control an output voltage induced in the secondary coil of the power transforming part, by interrupting a current in the primary coil of the power transforming part, a digital controlling part to control an interruption operation of the switching part according to a time constant determining a wave form of the output voltage of the power transforming part and a control reference value determining a level of the output voltage, and a digital interfacing part to convert input control data having first and second forms into the time constant and the control reference value, respectively, and to provide the time constant and the control reference value to the digital controlling part.