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Method and apparatus for controlling injection for frequency response measurements

A technology of frequency and controller, applied in the injection field of control frequency response measurement, which can solve problems such as easy to generate errors and unable to explain potential disturbances of the system

Active Publication Date: 2022-08-09
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although power supply designers prepare models of the power converter circuits they design and examine the frequency response from these models to confirm stability, these models cannot account for all potential disturbances of the system and can be prone to error

Method used

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  • Method and apparatus for controlling injection for frequency response measurements
  • Method and apparatus for controlling injection for frequency response measurements
  • Method and apparatus for controlling injection for frequency response measurements

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Embodiment Construction

[0014] To ensure the stability and desired performance of the facility, the control engineer implements a compensator to adjust the input to the facility, thus constructing a closed loop system. The choice of compensator is determined by the need for a system that is stable and also meets the desired performance characteristics (eg, settling time, overshoot, etc.). The frequency response of the open-loop gain (GH) is a widely accepted parameter for determining system stability, but can be difficult to measure because the facility (H) is unknown. Designers can create mathematical models to obtain H information. However, theoretical models cannot account for all potential disturbances and / or variations of the system (eg, parasitic effects) and can be prone to errors. The frequency response of the facility circuit H can be directly measured by injecting small signal perturbations into a closed or open loop system and sweeping the injection frequency across the range of interest ...

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Abstract

The present invention relates to methods and apparatus to control injection for frequency response measurements. An example method includes calculating the gain of the circuit (125, 330). The gain is calculated (150, 320) based on the measured response of the circuit to the injected first disturbance at the first frequency. A second frequency (135, 355) at which a second disturbance will be injected into the circuit is identified. The amplitude at which the second disturbance will be injected into the circuit at the second frequency is calculated (140, 360). The amplitude is calculated based on measurement noise (140, 410) and the gain (140, 430, 440) of the circuit at the first frequency. The second disturbance is injected into the circuit using the second frequency and the amplitude (150, 320).

Description

technical field [0001] The present invention relates generally to frequency response measurements, and more particularly to methods and apparatus for controlling injection of frequency response measurements. Background technique [0002] Power supply designers strive to design stable power converters. Although power supply designers prepare models for the designed power converter circuits and examine the frequency response from these models to confirm stability, these models cannot account for all potential disturbances of the system and can be prone to errors. Therefore, power supply designers prefer to measure the frequency response of the power supply circuit to verify the model method and to ensure the stability of the power supply circuit. Additionally, for power stages whose models can be computationally complex, a black-box approach based only on frequency response measurements can be used to verify the stability of the system. SUMMARY OF THE INVENTION [0003] In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
CPCG05B13/042G01R27/28G01R31/42G01R23/16
Inventor M·巴德瓦杰
Owner TEXAS INSTR INC