Power Supply Apparatus with Dual Feedback Control for Inkjet Printers
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Solution Overview
Problem
Conventional switching power supplies for inkjet printers face challenges in precisely controlling printhead driving voltage while maintaining motor driving voltage stability, leading to issues with high-speed print operations and image quality.
Innovation Solution
A power supply apparatus with a transformer having multiple windings and DC voltage generation units, where the motor driving voltage is generated by superimposing a voltage on the printhead driving voltage, and both voltages are fed back using DC coupling, allowing adjustable feedback factors for optimal control during print operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional switching power supply is used with single feedback control, then circuit arrangement is simple, but printhead driving voltage control precision deteriorates
Solution Approach 1:
The feedback control is segmented into two independent control loops: one for printhead driving voltage and another for motor driving voltage. Each loop has its own feedback factor and control IC, allowing independent optimization of control precision for each voltage without increasing overall system complexity
Solution Approach 2:
The feedback factors for printhead and motor voltages are made dynamically adjustable based on operation mode. During print operations, the printhead voltage feedback factor is increased for precise control, while during conveyance operations, the motor voltage feedback factor is increased for stable control
2Manufacturing precision
If printhead driving voltage is precisely controlled, then image quality improves, but motor driving voltage stability deteriorates
Solution Approach 1:
The system dynamically switches between two feedback factor configurations based on operation mode. In print mode, high feedback factor for printhead voltage ensures precise control for image quality. In conveyance mode, high feedback factor for motor voltage ensures stability for reliable operation
Solution Approach 2:
The feedback factors are changed as parameters based on operation state. The control system selects appropriate feedback factors for each voltage output according to whether the printer is performing print operations or conveyance operations, optimizing both image quality and motor stability
3Productivity
If single feedback factor is used for both voltages, then control circuit is simple, but print operation speed deteriorates
Solution Approach 1:
The control circuit is segmented into two independent control loops with separate feedback factors for printhead and motor voltages. This allows optimized control for high-speed print operations while maintaining circuit simplicity through modular design
Solution Approach 2:
The feedback factors are dynamically adjusted based on operation mode to enable high-speed print operations. During printing, the printhead voltage feedback is optimized for rapid response and precision, enabling faster print speeds
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 precise control of printhead driving voltage and stability of motor driving voltage, improving print quality and throughput by managing feedback factors based on print operation sequences.
Implementation Method 1
a transformer having a primary winding, a first secondary winding, and a second secondary winding
Data Source
AI summary
The power supply includes a transformer for generating a first output voltage by a first secondary winding, and a superimposing voltage by a second secondary winding, and a driver. Furthermore, the circuit includes first and second rectifying and smoothing circuits for respectively rectifying and smoothing the first output voltage and superimposing voltage, and an adder for adding the rectified and smoothed superimposing voltage on the rectified and smoothed first output voltage to output a second output voltage. The first and second output voltages are fed back respectively by DC coupling, the fed-back first and second output voltages are respectively adjusted by first and second feedback factors, and the adjusted feedback components are combined and amplified to be applied to the driver for PWM-control.