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A Control System with Fast Response Automatic Level Control Loop

A technology of automatic level and control loop, applied in transmission system, electrical components, etc., can solve problems such as slow response speed and poor stability

Active Publication Date: 2021-06-29
BEIJING MAXWELL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For this reason, the embodiment of the present invention provides a control system that responds quickly to the automatic level control loop to solve the problems of slow response speed and poor stability of the existing automatic level control loop

Method used

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  • A Control System with Fast Response Automatic Level Control Loop
  • A Control System with Fast Response Automatic Level Control Loop
  • A Control System with Fast Response Automatic Level Control Loop

Examples

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Embodiment 1

[0024] This embodiment discloses a fast response automatic level control loop control system, including: a preset voltage module 1 and an automatic level control ALC loop module 2, the ALC loop module 2 changes when the input signal , the front-end analog attenuator 3 works in the previous control voltage state, the output of the front-end analog attenuator 3 is sampled by the directional coupler 4, after sampling, it is converted into a real-time dynamic voltage by the loop detector 5, and the real-time dynamic voltage is transmitted to the loop Operational amplifier, the loop operational amplifier adjusts its output voltage through proportional calculation or integral form, and then provides it to the front-end analog attenuator 3 to form a closed loop. The front-end analog attenuator 3 adjusts its own gain value according to the latest real-time control voltage, and the ALC loop forms Dynamic loop, until the voltage value corresponding to the required output power set by the...

Embodiment 2

[0052]When the dynamic range of the input signal is not large, and the mean value detection independent of the modulation signal is required, and the peak-to-average value of the signal is relatively large, the detector in the ALC loop needs to use the mean value detector and cooperate with an external capacitor. Because the average detector itself contains an averaging part, its time response speed is slow, and when the external capacitor performs low video filtering on signals with a peak-to-average ratio, its time response time is even slower. In order to meet the requirements of fast real-time signal power control, it is necessary to introduce the above-mentioned new preset voltage module 1 to the ALC loop to ensure that the difference between the initial attenuation state and the final value of the front-end analog attenuator 3 is relatively small before the ALC loop works. small. It is necessary to set the preset voltage value through the voltage corresponding to the inp...

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Abstract

The embodiment of the present invention discloses a fast response automatic level control loop control system, including: a preset voltage module and an automatic level control ALC loop module, and the front-end analog attenuation of the ALC loop module when the input signal changes The output of the device is sampled by a directional coupler. After sampling, it is converted into a real-time dynamic voltage by a loop detector. The real-time dynamic voltage is transmitted to the loop operational amplifier. The loop operational amplifier adjusts its output voltage through proportional calculation or integral form, and then provides Form a closed loop for the front-end analog attenuator. The front-end analog attenuator adjusts its own gain value according to the latest real-time control voltage. The ALC loop forms a dynamic loop until it is adjusted to the voltage corresponding to the required output power set at the loop op amp. Value, the preset voltage module loads the preset voltage to the ALC loop, so that the ALC loop quickly works near the attenuation value and quickly enters a stable state. The invention solves the problems of slow response speed and poor stability of the existing automatic level control loop.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of automatic control, and in particular to a control system for a fast-response automatic level control loop. Background technique [0002] When the radio frequency link channel receives or transmits signals, it will encounter the situation that the dynamic range of the input signal changes rapidly, and the reaction to the hardware link will make the output signal also have a large dynamic range. In some applications, it is required that the output power can continue to keep the output stable at a certain fixed value when the input signal changes in a large dynamic range, and the link needs to be introduced into the ALC circuit part of the automatic loop gain control circuit. When it works normally, it can ensure that the output signal power is stable at a fixed value within a certain range. [0003] In some networking applications, there are multiple communication nodes in the sys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7085
CPCH04B1/7085
Inventor 李梁张江林
Owner BEIJING MAXWELL TECH
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