CN-114079425-B - Protection method and device for radio frequency power amplifier of transmitter

Abstract

The invention discloses a protection method and a protection device for a radio frequency power amplifier of a transmitter, wherein the transmitter is set to be the maximum working power, the working current of the radio frequency power amplifier is measured and recorded, the maximum current limit of the system is obtained according to the error vector amplitude of the system and the working current of the radio frequency power amplifier, an electronic fuse circuit is configured, and the current limit value of the electronic fuse circuit is set to be the maximum current limit of the system. The method provided by the invention can protect the final power amplifier of the transmitter, and is simple, fast, efficient and low in cost.

Inventors

• LIN ZHIRONG

Assignees

• 广东新岸线科技有限公司

Dates

Publication Date

20260508

Application Date

20200819

Claims (4)

1. 1. A method for protecting a radio frequency power amplifier of a transmitter, comprising: The transmitter is set to be at maximum working power, and the working current I 1 of a final-stage power amplifier of the transmitter is measured and recorded; The radio frequency power amplifier is powered by a first power supply alone, the working current of the system is set to be I 1 , the transmitter is set to be maximum working power, and the current obtained by measuring that the error vector magnitude EVM is equal to a preset error vector magnitude threshold value EVM 1 is the maximum current limiting I 2 of the system; configuring an electronic fuse circuit, setting the current limiting value of the electronic fuse circuit as I 2 , testing the system at high and low temperatures, and judging whether the maximum current I 2 measured value is accurate or not according to the system performance index parameter; The electronic fuse circuit is connected between the radio frequency power amplifier and the first power supply of the power supply.
2. 2. The method of protecting a transmitter radio frequency power amplifier of claim 1, further comprising: Limiting the maximum power of the input end of the power amplifier through a limiter; the power amplifier is protected from the antenna end by a circulator connected between the output of the amplifier and the antenna.
3. 3. A transmitter radio frequency power amplifier protection device, comprising: The acquisition module is used for acquiring the maximum current limiting I 2 of the system under the maximum working power of the transmitter, and comprises the following steps: the first measuring unit is used for measuring and recording the working current I 1 of the radio frequency power amplifier of the transmitter under the maximum working power; The second measuring unit is used for setting the working current of the system to be I 1 when the radio frequency power amplifier of the transmitter singly uses the first power supply to supply power, and measuring and recording the current of the system under the maximum working power of the transmitter; the system comprises a first measuring unit, a second measuring unit, a determining unit, an electronic fuse circuit, a radio frequency power amplifier and a power supply unit, wherein the first measuring unit is used for obtaining a working current of the system maximum current limiting I 2 when the error vector amplitude EVM is equal to a preset error vector amplitude threshold EVM 1 ; And the detection unit is used for setting the current limit value of the electronic fuse circuit as I 2 when the determination unit determines that the maximum current limit I 2 of the system is reached, testing the system at high and low temperatures, judging whether the measured value of the maximum current I 2 is accurate or not according to the system performance index, and re-measuring the maximum current limit I 2 of the system when the system performance index parameter does not reach the standard.
4. 4. The transmitter radio frequency power amplifier protection device of claim 3, further comprising: the limiter is connected to the input end of the radio frequency power amplifier so as to limit the maximum power of the power amplifier; And the circulator is connected between the output end of the radio frequency power amplifier and the antenna, so that the power amplifier is free from the influence of the antenna end.

Description

Protection method and device for radio frequency power amplifier of transmitter Technical Field The invention belongs to the technical field of wireless communication, and particularly relates to a protection method and device for a radio frequency power amplifier of a transmitter. Background Radio frequency power amplifiers (RF PAs) are an important component of various wireless transmitters. In the front-stage circuit of the transmitter, the power of the radio frequency signal generated by the modulation oscillation circuit is very small, and the radio frequency signal can be fed to an antenna to radiate after a series of amplification-buffer stages, intermediate amplification stages and final power amplification stages are needed to obtain enough radio frequency power. In order to obtain a sufficiently large rf output power, an rf power amplifier must be employed. However, in the outdoor use process of the base station equipment, equipment circuits such as a radio frequency power amplifier and the like are damaged due to antenna load faults and lightning stroke conditions, meanwhile, the cost of radio frequency protection devices such as a limiter and a circulator is high, the use is limited in some low-cost schemes, and certain related instruments and debugging experience are needed when the limiter and the circulator are added into the circuits, so that the debugging is complex. Disclosure of Invention In view of the above, the invention provides a protection method and a device for a transmitter radio frequency power amplifier, which can protect a final power amplifier, and simultaneously has the advantages of simple debugging, simplicity, high efficiency, low cost and capability of meeting the long-term stable working requirement of equipment. A method of protecting a transmitter radio frequency power amplifier, comprising: The transmitter is set to be the maximum working power, and the working current I 1 of the radio frequency power amplifier is measured and recorded; obtaining a maximum current limit I 2 of the system according to the error vector amplitude of the system and the working current I 1 of the radio frequency power amplifier; And configuring an electronic fuse circuit, and setting the current limiting value of the electronic fuse circuit as the system maximum current limiting I 2. The radio frequency power amplifier is a final-stage power amplifier of the transmitter; When the maximum current limit I 2 of the system is obtained through measurement, the radio frequency power amplifier is powered by a first power supply alone, the working current of the system is set to be I 1, the transmitter is set to be the maximum working power, and the current when the error vector magnitude EVM obtained through measurement is equal to the preset error vector magnitude threshold value EVM 1 is the maximum current limit I 2 of the system. And configuring an electronic fuse circuit, setting the current limiting value of the electronic fuse circuit as I 2, testing the system at high and low temperatures, judging whether the maximum current I 2 measured value is accurate or not according to the system performance index parameter, and re-measuring the maximum current limiting I 2 of the system when the system performance index parameter does not meet the requirement. The electronic fuse circuit is connected between the radio frequency power amplifier and the first power supply of the power supply; optionally, limiting the maximum power at the input of the power amplifier by a limiter; The power amplifier is protected from the antenna end by the circulator connected between the amplifier output and the antenna. A transmitter radio frequency power amplifier protection device comprising: The acquisition module is used for acquiring the maximum current limiting I 2 of the system under the maximum working power of the transmitter; And the electronic fuse circuit is connected between the radio frequency power amplifier and a power supply of the radio frequency power amplifier, and the current limiting value of the electronic fuse circuit is the maximum current limiting I 2 of the system. The acquisition module comprises: the first measuring unit is used for measuring and recording the working current I 1 of the radio frequency power amplifier of the transmitter under the maximum working power; The second measuring unit is used for setting the working current of the system to be I 1 when the radio frequency power amplifier of the transmitter singly uses the first power supply to supply power, and measuring and recording the current of the system under the maximum working power of the transmitter; And the determining unit is used for determining that the working current obtained by the second measuring unit is the maximum current limiting I 2 of the system when the error vector magnitude EVM is equal to the preset error vector magnitude threshold value EVM 1. And the detection unit is used for setting the curren