Digital Power Supply Control Device Stabilizing Output Voltage
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Solution Overview
Problem
The existing digital power supply control techniques face instability and reduced noise resistance due to frequent changes in amplification factors and bit accuracy, leading to unstable output voltage and decreased performance when noise occurs.
Innovation Solution
A control device that selects mode signals corresponding to different amplification factors based on frequency measurements of index values within predetermined ranges, maintaining the current mode when frequencies are below thresholds and adjusting the mode signal when frequencies exceed thresholds, thereby stabilizing the output voltage and improving noise resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the amplification factor is frequently adjusted to match A/D conversion range, then the signal range utilization is improved, but the output voltage stability deteriorates
Solution Approach 1:
The patent implements periodic sampling of the input signal to determine maximum and minimum values over a defined period, rather than continuously adjusting the amplification factor. This periodic measurement approach allows the system to adapt to signal range changes while maintaining stability during each measurement period, resolving the contradiction between adaptability and stability.
Solution Approach 2:
The system performs preliminary measurements of the input signal's maximum and minimum values before adjusting the amplification factor. By提前 (in advance) determining the signal range through maximum/minimum detection circuits, the system can pre-calculate the appropriate amplification factor to apply, avoiding frequent unstable adjustments and ensuring smooth transitions that maintain output stability.
2Measurement precision
If the bit accuracy is frequently changed, then the A/D conversion precision is improved, but the noise resistance deteriorates
Solution Approach 1:
The patent applies periodic action by maintaining a fixed bit accuracy setting over defined periods rather than frequently changing it. The system periodically evaluates whether a bit accuracy change is needed based on accumulated maximum/minimum signal values, but only makes changes when clearly warranted. This periodic approach improves precision when needed while maintaining noise resistance during stable periods.
Solution Approach 2:
The system implements feedback mechanisms where the maximum and minimum detection circuits continuously monitor the input signal range and provide feedback to the amplification factor calculation unit. This feedback loop allows the system to intelligently determine when bit accuracy changes are necessary, making informed decisions that improve conversion precision without unnecessary changes that would reduce noise resistance.
3Speed
If the amplification factor is adjusted based on single-cycle maximum and minimum values, then the response speed is improved, but the control accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by performing maximum and minimum value detection over a defined period before finalizing the amplification factor adjustment. Rather than reacting to single-cycle fluctuations, the system preliminarily accumulates signal data to determine the true signal range, then applies the amplification factor based on this comprehensive measurement. This ensures both timely response and high control accuracy.
Solution Approach 2:
The system implements dynamic behavior by adapting the measurement period and adjustment frequency based on signal characteristics. When signals are stable, the system uses longer measurement periods for higher accuracy. When signals change rapidly, the system shortens the period to maintain response speed. This dynamic adaptation resolves the contradiction between response speed and control accuracy.
Data Source
AI summary
In a digital control power supply, a mode control unit measures a first frequency and a second frequency for a difference between a second digital value and a target value. Based on the measured first frequency and second frequency and a predetermined threshold set to the first and second frequencies, the mode control unit determines whether an amplification factor for use in amplification processing by an amplifier is maintained at a current amplification factor or is changed to an amplification factor which is larger or smaller by 1 than the current amplification factor. This contributes to an improvement in noise resistance of the digital control power supply and prevents an output voltage from being unstable.