Power Supply Device Power Control for Image Heating Apparatus
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Solution Overview
Problem
Conventional methods for calculating the maximum power suppliable to an image heating device in image forming apparatuses require additional current or voltage detection circuits, increasing the cost of the apparatus.
Innovation Solution
An image forming apparatus with a power supply device that includes a rectifying and smoothing unit, a transformer with primary, secondary, and auxiliary windings, a switching unit, and control units to detect and transmit information about the maximum power value based on detected current and voltage, allowing the secondary control unit to control power supply to the heater without additional detection circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional current or voltage detection circuits are added to calculate the maximum power suppliable to the image heating device, then the power control accuracy is improved, but the device complexity and cost increase
Solution Approach 1:
The patent merges the power detection function into the existing switching power supply device by utilizing its built-in current detection unit and voltage detection unit. The maximum power calculation is performed by integrating the product of detected current and voltage values over time within the power supply device itself, eliminating the need for separate detection circuits in the image heating device.
Solution Approach 2:
The switching power supply device is designed to perform multiple functions: it not only supplies power to the image heating device but also detects current and voltage, calculates the maximum suppliable power, and transmits this information to the image heating device. This multi-functionality reduces the need for additional dedicated components.
2Adaptability or versatility
If additional current or voltage detection circuits are added to calculate the maximum power suppliable to the image heating device, then the power control capability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent merges the power detection function into the existing switching power supply device by utilizing its built-in current detection unit and voltage detection unit. The maximum power calculation is performed by integrating the product of detected current and voltage values over time within the power supply device itself, eliminating the need for separate detection circuits in the image heating device.
Solution Approach 2:
The switching power supply device performs self-detection of current and voltage, self-calculation of maximum suppliable power, and self-transmission of this information to the image heating device. This self-service approach eliminates the need for additional detection circuits and reduces manufacturing costs.
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
Enables calculation of the maximum power suppliable to the image heating device without the need for separate current or voltage detection circuits, reducing the cost and complexity of the apparatus while maintaining effective power control.
Implementation Method 1
a rectifying and smoothing unit configured to rectify and smooth an AC voltage from the AC power source to generate an input voltage
Implementation Method 2
a transformer including a primary winding, a secondary winding, and an auxiliary winding, a switching unit connected to the primary winding of the transformer, the primary winding configured to receive the input voltage
Implementation Method 3
a feedback unit configured to output a feedback voltage according to an output voltage induced in the secondary winding of the transformer
Data Source
AI summary
The image forming apparatus is characterized in that information about an input voltage detected on the primary side of a transformer is transmitted from a primary-side switching control unit to a secondary-side controller for controlling a heating device, and the controller controls the temperature of a heater of the heating device based on the transmitted information.