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Negative voltage protection circuit

A protection circuit and negative pressure technology, applied in the direction of amplifier protection circuit layout, etc., can solve the problems of accelerating discharge speed, burning out of power amplifier tubes, increasing circuit complexity, etc.

Active Publication Date: 2021-10-19
KINGSIGNAL TECHNOLOGY CO LTD
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] However, in this process, the gate voltage loses the required negative voltage protection first, and then the conditional switch turns off the leakage voltage. Generally, there is a filter capacitor with a large capacitance at the leakage voltage, and it takes a long time for the leakage voltage to drop from being turned off to zero. for a long time, see for example Figure 5 , the drain of the power amplifier tube is powered off at t1, but the drain voltage is completely reduced to 0V at t2, and the time difference between t1 and t2 is 10ms, and the power amplifier tube may still be burned out
In order to solve this problem, a discharge circuit is added to the leakage voltage to speed up the discharge speed after the drain is closed. This not only increases the complexity of the circuit, but also reduces the reliability of the circuit. When the negative pressure is pulled down instantly, the power amplifier tube may still be burnt out

Method used

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Embodiment Construction

[0052] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the application are given in the drawings. However, the present application can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this application more thorough and comprehensive.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application.

[0054] It can be understood that the terms "first", "second" and the like used in this application may be...

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Abstract

The invention relates to a negative voltage protection circuit. On one hand, a drain voltage control module disconnects a conductive path between a drain power supply and a drain of a power amplifier tube according to a first voltage, a second voltage and a drain switching signal, so that timely disconnection of the drain voltage can be realized through the first voltage, the second voltage and the drain switching signal; and on the other hand, when the received second voltage is changed into 0V, a voltage buffer module reduces the voltage change rate of an output sixth voltage, and finally, the time required for the drain electrode of the power amplifier tube to be powered off and the drain voltage to be reduced to be 0 is far shorter than the time required for the sixth voltage of the grid electrode of the power amplifier tube to be reduced to be 0, namely, when the drain electrode of the power amplifier tube is powered off and the drain voltage becomes 0, the sixth voltage only changes by a small amount, and the grid voltage is always under the safe negative voltage protection, so that the protection of the power amplifier tube is realized.

Description

technical field [0001] The invention relates to the technical field of power amplifier tube control, in particular to a negative pressure protection circuit. Background technique [0002] Based on the requirements of 5G communication, the frequency band of the base station amplifier is getting higher and higher, but usually the higher the frequency band of the power tube, the lower the efficiency. The number of channels of the 5G base station is generally more than 4 channels, and even up to 64 channels. Based on the increasingly higher requirements for the frequency band of power tubes, traditional power tubes can no longer meet the requirements of high efficiency, so more and more base station amplifiers use GaN power amplifier tubes. The efficiency of the GaN power amplifier tube is higher than that of the traditional LDMOS tube, but if the GaN power amplifier tube is turned on for leakage voltage without negative voltage protection on the gate, it will burn out in an ins...

Claims

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Application Information

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IPC IPC(8): H03F1/52
CPCH03F1/52
Inventor 牛斌简春兵胡业芳陈发亮
Owner KINGSIGNAL TECHNOLOGY CO LTD
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