Source Measure Unit Controller Bandwidth Equalization
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Solution Overview
Problem
Conventional source measure units often cause overshoot and disharmonious variation in output signals when switching control modes, leading to decreased reliability in power supply due to inadequate adjustment of voltage or current.
Innovation Solution
An output control method for controllers that detects current and voltage values at multiple time points, calculates a ratio between them, and adjusts the setting parameter to equalize bandwidth in both voltage and current feedback loops when switching between control modes, ensuring harmonious signal output and preventing overshoot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional source measure unit adjusts voltage or current when output reaches a preset threshold, then the voltage or current can be adjusted to fit requirements, but overshoot occurs in the supplied voltage or current
Solution Approach 1:
The patent applies preliminary action by predicting the optimal adjustment timing before the output reaches the preset threshold. The prediction unit forecasts when adjustment should occur to prevent overshoot, rather than waiting for the threshold to be reached. This advance planning allows the control unit to adjust voltage or current at the optimal moment, ensuring precision while maintaining reliability.
2Adaptability or versatility
If a conventional source measure unit switches control loops, then the controller can adapt to different control requirements, but the output signal exhibits disharmonious variation waveform
Solution Approach 1:
The patent implements feedback by continuously monitoring the output signal characteristics during control loop switching. The prediction unit uses feedback information about the current output state to determine the optimal switching timing, ensuring that transitions occur when they will not cause disharmonious waveforms. This feedback mechanism allows the system to maintain stability while adapting to different control requirements.
3Adaptability or versatility
If a conventional source measure unit switches from voltage control mode to current control mode or vice versa, then the controller can meet different test requirements, but the bandwidth in feedback loops becomes unbalanced
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the bandwidth parameters of the feedback loops during mode switching. The prediction unit calculates the optimal bandwidth settings for both voltage and current feedback loops based on the target control mode, and the control unit implements these parameter changes to maintain balanced bandwidth. This ensures that the system can flexibly switch between modes while preserving feedback loop precision.
Data Source
AI summary
An output control method for a controller includes the following steps. At each of detection time points, the controller detects a detection voltage value and a detection current value of a load. In a voltage control mode, the controller generates a setting parameter to control the power amplifier according to part of the detection voltage values. In a current control mode, the controller generates the setting parameter to control the power amplifier according to part of the detection current values. When the controller switches to the voltage control mode or the current control mode, the controller determines a ratio between the detection current value and the detection voltage value at one of the detection time points and the setting parameter is generated according to the ratio. Therefore, the bandwidth is substantially the same no matter if the controller operates in the voltage control mode or the current control mode.