High Voltage Power Supply Delay Circuit for Overshoot Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High voltage power supplies in laser printers and replicators experience sudden overshoot in output voltage when power is initially supplied, leading to potential damage to devices and reduced image formation quality.
Innovation Solution
Incorporating a power input delay unit that delays the output of the power signal to the comparison unit by a predetermined time after the power signal is initially provided, using a controller to generate a PWM signal and a logic control signal to activate transistors that control the flow of the power signal, preventing sudden overshoot by synchronizing the power signal with the transition to a logic HIGH state of the PWM signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the power signal is immediately supplied to the comparison unit when power is initially provided, then the system responds quickly, but a sudden overshoot phenomenon occurs in the high voltage output when the PWM signal transitions to HIGH state
Solution Approach 1:
The power signal is delayed by a predetermined time using a delay circuit before being supplied to the comparison unit. This preliminary timing adjustment ensures that the power signal arrives at the comparison unit just before the PWM signal transitions to HIGH state, preventing voltage overshoot while maintaining quick response
2Stability of the object's composition
If the power signal is delayed to prevent overshoot, then voltage stability improves, but the system response time increases
Solution Approach 1:
The delay time is precisely adjusted to a predetermined value that optimizes the timing between power signal arrival and PWM signal transition. This parameter optimization ensures minimal delay while preventing overshoot, achieving both voltage stability and fast response
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
Prevents sudden overshoot in high voltage output, minimizing damage to components in image forming apparatuses by ensuring the power signal is supplied only when the PWM signal transitions to a logic HIGH state, thereby stabilizing the output voltage and extending the lifespan of high voltage rollers and improving image formation.
Implementation Method 1
An input unit 20 converts the PWM signal provided from the controller 10 into a DC voltage using a RC low pass filter
Implementation Method 2
The HVPS transforms a DC input voltage of 24 [V] into a high voltage in the range of several hundreds to several thousands of volts using a transformer
Implementation Method 3
A rectification unit 50 rectifies the high voltage type signal of the transformation unit 40 and finally outputs a high voltage signal of a DC type
Data Source
AI summary
Provided is a high voltage power supply which includes a controller to provide a PWM signal and a power signal, an input unit to receive the PWM signal provided from the controller, a comparison unit to control output of the power signal supplied from the controller by comparing a signal filtered to a DC voltage by the input unit to a voltage reference signal, a transformation unit to transform the power signal output from the comparison unit, and a rectification unit to rectify the signal output by the transformation unit, wherein the high voltage power supply further includes a power input delay unit to delay the supply of the power signal to the comparison unit by a predetermined time from when the power supplied from the controller for input into the comparison unit. The high voltage power supply can prevent components of a device from being damaged due to sudden voltage surge in an output power output from an output terminal, which can occur when a time at which a PWM signal is transitioned to a HIGH state. The power signal is delayed with respect to a time at which a high voltage driving power 24 [V] is initially supplied.