Phase Detecting Device Standby Power Reduction
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Solution Overview
Problem
Existing phase detecting devices for image forming apparatuses consume excessive power in standby mode and exhibit nonuniformities in detecting zero-crossing points of AC voltage due to variations in manufacturing and sensitivity differences between phase detectors for positive and negative polarities.
Innovation Solution
A phase detecting device with a power input unit that includes a full-wave rectifier and a power switch, which selectively cuts off AC power in standby mode to reduce consumption and uses a single phase detector to accurately detect zero-crossing points from rectified AC voltage, ensuring consistent phase control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a phase detecting device with separate phase detectors for positive and negative polarities is used, then zero-crossing points can be detected for both polarities, but manufacturing variations and sensitivity differences cause nonuniformities in detection accuracy
Solution Approach 1:
The patent merges the detection of both positive and negative polarities into a single phase detector by using full-wave rectification. The rectified AC voltage converts both positive and negative half-cycles into uniform positive voltage waves, allowing one detector to accurately identify zero-crossing points for both polarities without suffering from manufacturing variations between multiple detectors.
Solution Approach 2:
The patent changes the voltage parameter by applying full-wave rectification to the AC input signal. This transformation converts the bipolar AC voltage into unipolar rectified voltage, fundamentally altering the signal characteristics so that a single phase detector can handle both polarities uniformly, thereby improving detection consistency.
2Productivity
If phase detectors remain active in standby mode to maintain detection capability, then phase control can be quickly resumed, but excessive power is consumed during standby periods
Solution Approach 1:
The patent implements dynamic power management by making the phase detecting device operable in both active and standby modes. A power control unit dynamically switches the device between these modes based on operational requirements, allowing the system to reduce power consumption during standby while maintaining the capability to quickly resume phase detection when needed.
Solution Approach 2:
The patent employs periodic activation of the phase detecting device rather than continuous operation. During standby mode, the device is deactivated to save power, and only activated periodically or on-demand when phase control is required, thus reducing overall energy consumption while maintaining operational readiness.
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
The solution reduces power consumption in standby mode and enhances the accuracy of phase control by using a single phase detector for both polarities, improving the reliability and cost-effectiveness of the phase detecting device.
Implementation Method 1
a power input unit that includes a full-wave rectifier
Data Source
AI summary
A phase detecting device includes a power input unit that receives an AC voltage; a phase detector that detects zero-crossing points of the AC voltage, and outputs a phase detecting signal when the zero-crossing points of the AC voltage are detected; and a power switch that selectively cuts off a flow of AC into the power input unit in response to a mode control signal.