Power Factor Correction Circuit for Energy Saving Modes
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Solution Overview
Problem
Conventional power supply devices in image forming devices face limitations in efficiency enhancement, even when output voltage is interrupted for energy saving modes, due to continuous energization of the power supply unit.
Innovation Solution
A power supply device incorporating a rectification circuit, a power factor improvement circuit that boosts and smooths voltage with a capacitor, a DC-DC converter for voltage stepping, a detection circuit for voltage conditions, and a switch circuit to temporarily activate the power factor improvement circuit during energy saving modes, optimizing voltage conditions for increased efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the output voltage from the power supply section is interrupted in energy saving mode, then the power supply load is reduced to low load or no load state and efficiency is increased, but continuous energization of the power supply unit limits further efficiency improvement
Solution Approach 1:
The power factor improvement circuit is operated periodically instead of continuously. The operation control circuit activates this circuit at specific intervals based on the output voltage from the DC-DC converter, creating a periodic on-off pattern that reduces overall energy consumption while maintaining necessary power factor correction functionality.
Solution Approach 2:
The operating state of the power factor improvement circuit is made dynamic rather than static. The operation control circuit adjusts the circuit's operation status based on real-time detection of voltage conditions, allowing the system to adapt between active and inactive states according to actual power supply needs.
2Reliability
If the power factor improvement circuit is continuously operated, then power factor correction is maintained, but power consumption increases and efficiency decreases
Solution Approach 1:
The operation control circuit uses feedback from the voltage detection circuit to determine when to activate the power factor improvement circuit. The detection circuit monitors the output voltage from the DC-DC converter and provides this information to the control circuit, which then adjusts the power factor improvement circuit's operation accordingly, creating a closed-loop control system.
Solution Approach 2:
The power factor improvement circuit operates periodically based on detected voltage conditions rather than continuously. This periodic operation maintains power factor correction reliability when needed while reducing power consumption during periods when correction is less critical.
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 configuration enhances the efficiency of the power supply by intermittently reactivating the power factor improvement circuit, reducing power consumption and increasing overall power supply efficiency during sleep modes.
Implementation Method 1
a rectification circuit that is supplied with AC power from an AC power supply
Implementation Method 2
a power factor improvement circuit that boosts an output voltage of the rectification circuit
Implementation Method 3
smooths a boosted voltage with a capacitor
Implementation Method 4
a DC-DC converter that steps down the DC output voltage to a prescribed first voltage
Data Source
AI summary
A power supply device includes a rectification circuit that is supplied with AC power from an AC power supply, a power factor improvement circuit that boosts an output voltage of the rectification circuit, smooths a boosted voltage with a capacitor, and thereby generates a DC output voltage outputted to a load circuit, a DC-DC converter that steps down the DC output voltage to a prescribed first voltage, a DC output voltage detection circuit that detects whether or not the DC output voltage satisfies a prescribed condition, and a switch circuit that temporarily puts the power factor improvement circuit in an operating state by use of the first voltage each time the prescribed condition is satisfied in a period in which the power factor improvement circuit is in a stopped state due to an energy saving mode of the load circuit.