Power Supply Apparatus Voltage Ripple Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional high voltage power supply apparatuses for electrophotography systems exhibit significant variations in output voltage ripple due to feedback control mechanisms, leading to inefficiencies in voltage regulation, particularly when load resistance and output current vary.
Innovation Solution
A power supply apparatus featuring a transformer with insulated primary and secondary sides, a switching element, a control unit that outputs pulse signals to drive the switching element, and a comparing unit to adjust the frequency or on-duty ratio of the pulse signal based on target voltage, ensuring the output voltage is maintained at the desired level by cutting off input to the switching element when the output voltage exceeds the target.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback control is implemented to maintain output voltage, then voltage regulation is achieved, but ripple variation increases significantly with changing voltage and current levels
Solution Approach 1:
The patent applies dynamics by making the oscillating frequency of the switching element variable rather than fixed. The control unit adjusts the oscillating frequency dynamically based on the detected output voltage level and target voltage, allowing the system to adapt to changing load conditions and minimize ripple variation across different operating points
Solution Approach 2:
The patent changes the parameter of oscillating frequency based on operating conditions. The control unit determines the appropriate oscillating frequency according to the detected output voltage and target voltage, thereby optimizing the power supply performance and suppressing ripple variation under different voltage and current levels
2Power
If output voltage is increased to meet high voltage requirements, then electrophotography function is enabled, but ripple becomes smaller and control precision is affected
Solution Approach 1:
The system dynamically adjusts the oscillating frequency based on the output voltage level. When output voltage is high, the control unit modifies the frequency to maintain optimal control precision, preventing the ripple reduction issue that would otherwise degrade voltage control accuracy at high voltage levels
3Device complexity
If simple and low-cost power supply configuration is used, then device complexity is reduced, but ripple suppression capability deteriorates
Solution Approach 1:
The patent suppresses ripple in a simple power supply configuration by changing the oscillating frequency parameter dynamically. The control unit adjusts frequency based on detected voltage and target voltage, enabling effective ripple suppression without adding complex hardware circuits, thus maintaining low device complexity while improving power 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
This solution effectively suppresses output voltage ripple variations, maintaining stable voltage regulation across different load conditions and resistance levels, even in simple and low-cost power supply configurations.
Implementation Method 1
a transformer (T101) having a primary side and a secondary side which are insulated from each other
Implementation Method 2
a switching element (Q101) which switches a primary current (Ip) of the transformer (T101), the switching element (Q101) being connected to the primary side of the transformer (T101)
Implementation Method 3
a power supply apparatus (200) includes a comparator (CP101), and performs feedback control of the output voltage output from an output 1
Data Source
AI summary
The power supply apparatus includes a switching element configured to drive a transformer, a primary side and a secondary side of the transformer being insulated from each other, a control unit configured to output a pulse signal for driving the switching element, and a comparing unit configured to compare a target voltage of an output voltage that is output from the secondary side of the transformer and the output voltage, and to control the output voltage to be the target voltage, wherein the comparing unit cuts off an input of the pulse signal to the switching element in a case where the output voltage is larger than the target voltage, and wherein the control unit determines a frequency or an on-duty ratio of the pulse signal according to the target voltage.