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A power amplifier protection circuit and method

A technology for protecting circuits and comparing circuits, applied in the field of circuits, can solve problems such as protection lag and failure to achieve protection effects, and achieve the effect of avoiding damage

Active Publication Date: 2019-01-22
36TH RES INST OF CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a protection circuit and method to solve the technical problems of the existing protection circuit, protection lag, and failure to achieve the expected protection effect

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  • A power amplifier protection circuit and method
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Embodiment Construction

[0039] The design concept of the present invention is: aiming at the problem that the current power amplifier protection measures do not achieve the desired protection effect in practical applications, after analysis, it is known that the main reason for failing to meet protection expectations is that all current protection circuit designs are based on hindsight. That is to say, the fault can only be detected after the power amplifier has already experienced a serious fault state, and then corresponding measures can be taken, which brings hysteresis, making the power amplifier continue to run for a period of time under the serious fault state, thus causing damage .

[0040] Take the case of a large standing wave fault as an example. Excessive reflected power (large standing wave) caused by poor matching or output cable contact is the most harmful fault condition to the power amplifier. At present, there are two mainstream large standing wave protection circuit designs, one i...

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Abstract

The invention discloses a power amplifier protection circuit and a method. The circuit comprises a first stage comparison circuit and a second stage comparison circuit connected in series with the first stage comparison circuit. The first stage comparison circuit comprises a first operational amplifier, which is used for receiving the power detection voltage value corresponding to the current timeof input and the power detection voltage value of the preset time before the current time, comparing the power detection voltage value and the preset time, obtaining the difference value between thetwo, and outputting the difference value as one of the inputs of the second stage comparison circuit. The second stage comparison circuit includes a second comparator for receiving a difference valueoutput by the first stage comparison circuit and receiving a preset difference threshold value, and comparing the difference value with the difference threshold value, and outputting an alarm when thedifference value is greater than the difference threshold value. Therefore, when the detected voltage difference exceeds the preset difference threshold value in a certain period of time, the alarm is carried out, and the fault protection measures are taken in advance to avoid damage to the power amplifier equipment, thus solving the problem of equipment damage that troubles the power amplifier for a long time.

Description

technical field [0001] The invention relates to the field of circuit technology, in particular to a power amplifier protection circuit and method. Background technique [0002] As an important component of communication and special communication systems, the stability and reliability of the power amplifier (ie, power amplifier) ​​is directly related to the working effect of the entire system. However, since the power amplifier is a high-power device, it has the inherent characteristics of high-power devices, such as large current, high temperature, and load sensitivity during operation. The stability and reliability of the work are subject to many external factors, such as temperature, frequency changes, etc. Impact. Any abnormalities in the equipment connected before and after the power amplifier and the environment may be "magnified" into serious failures or even damage the power amplifier. Therefore, all power amplifiers are designed without exception with a large numbe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/52H03F3/21H03F3/45
CPCH03F1/52H03F3/21H03F3/45071
Inventor 邹炜
Owner 36TH RES INST OF CETC