A standing wave ratio detection and high power protection circuit with adaptive control

Abstract

The invention relates to a standing wave ratio detection and high-power protection circuit with adaptive control, including a signal isolator, a power amplifier tube protection circuit, a three-stage power amplifier tube, a high-power high-isolation isolator, and an automatic calibration detection circuit , forward output coupler, reverse output coupler, the signal isolator, power amplifier tube protection circuit, three-stage power amplifier tube, forward output coupler, high-power high-isolation isolator, reverse output coupler The devices are connected in turn, the input ends of the automatic calibration detection circuit are respectively connected to the forward output coupler and the reverse output coupler, and the output ends are respectively connected to the power amplifier tube protection circuit and the three-stage power amplifier tube. Compared with the prior art, the invention has the advantages of high safety, wide application range, strong adaptability and the like.

Description

technical field [0001] The invention relates to a standing wave ratio detection and high-power protection circuit, in particular to a standing wave ratio detection and high-power protection circuit with adaptive control. Background technique [0002] 1. In the communication system, the standing wave is the main index to measure the degree of impedance mismatch, and the excessive standing wave ratio will affect the communication distance, reduce the quality of information transmission, and cause a system problem in the radio frequency circuit. The power amplifier located at the front end of the wire The deterioration of the standing wave ratio is a sensitive part. When the reflected power returns to the amplifier, it will cause damage to the high power amplifier. In order to prevent this phenomenon, it is very important to protect the high power amplifier. [0003] 2. The most important indicator in the antenna feeder system is also the VSWR. Therefore, in the construction a...

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Problems solved by technology

[0004] Regarding the above two phenomena, in the current repeater station, the protection of the power amplifier itself is mainly realized through the isolator / circulator, and the reverse isolation of the isolator on the market is generally about 15-20dB, while For high-power repeaters, a 20dB isolator is not enough to guarantee damage to the amplifier in harsh conditions; and for antennas, a simple standing wave alarm can no longer meet the daily maintenance and installation needs of real operators

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