Power Supply Apparatus Burst Mode Oscillation Control
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Solution Overview
Problem
Conventional current resonance switching power sources for large-format printers face challenges in reducing power consumption, as the oscillation operation count tends to increase, making it difficult to implement power savings effectively.
Innovation Solution
A power supply apparatus that operates in two modes, using a current resonance circuit with a transformer, oscillator, reference voltage sources, and a controller to adjust oscillation frequency and secondary side voltage based on comparison results, extending the burst period and reducing the oscillation operation period to lower power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the feedback signal is evaluated by using two thresholds and the error amplifier with high gain, then the secondary side voltage fluctuation falls within a predetermined small range, but the oscillation operation count per unit time increases, making it difficult to reduce power consumption
Solution Approach 1:
The patent applies dynamics by making the threshold selection adaptive rather than fixed. The controller dynamically switches between first and second thresholds based on the detected secondary side voltage, allowing the system to adjust its control characteristics in real-time. This dynamic approach enables broader voltage fluctuation acceptance during burst mode while maintaining precision when needed, thereby reducing unnecessary oscillation operations and lowering power consumption.
Solution Approach 2:
The patent changes the parameter of threshold values based on operating conditions. By selecting from multiple threshold values (first threshold and second threshold) depending on the secondary side voltage level, the system optimizes the balance between voltage control precision and power consumption. This parameter change strategy allows the oscillation operation count to be reduced while still maintaining acceptable voltage regulation.
2Loss of energy
If the time ratio of oscillation operation period to burst period is made small, then the self-consumption power ratio is reduced and efficiency is improved, but the secondary side voltage stabilization becomes more difficult
Solution Approach 1:
The patent uses dynamic threshold selection to maintain voltage stabilization effectiveness even when the oscillation duty ratio is reduced. By adaptively choosing appropriate thresholds based on the secondary side voltage state, the controller ensures that voltage stabilization remains reliable while allowing for extended burst periods that reduce self-consumption power ratio.
Solution Approach 2:
The patent employs periodic burst mode operation with optimized duty ratios. By controlling the oscillation operation to occur in periodic bursts rather than continuously, and by optimizing the duty ratio within these bursts using adaptive threshold comparison, the system achieves both reduced power loss and maintained voltage stabilization through the periodic nature of the control action.
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 significantly extends the burst period, reducing the oscillation operation period to burst period ratio, thereby achieving a substantial reduction in power consumption and improving efficiency in large-format printers.
Implementation Method 1
a current resonance circuit, viewed from a primary side, as an input and a secondary side, as an output
Implementation Method 2
an oscillator configured to perform an oscillation operation to the transformer
Implementation Method 3
a direct voltage obtained by rectifying a received AC voltage
Data Source
AI summary
In a conventional current resonance switching power source, the burst period of a burst operation could not be sufficiently prolonged, and the efficiency characteristics were insufficient in a light load. In order to improve this, an embodiment of the present invention generates, upon operating in the burst mode, a control signal in accordance with a comparison result of a first reference voltage and a secondary side voltage of a transformer and a comparison result of a second reference voltage and the secondary side voltage of the transformer. Subsequently, the oscillation operation timing of an oscillator that performs an oscillation operation to the transformer and the oscillation frequency that changes the voltage excited on the secondary side of the transformer are controlled based on the control signal.