A Power Overshoot Protection Circuit for Digital TV Power Amplifier

A power amplifier and digital TV technology, applied in the direction of amplifier protection circuit layout, etc., can solve the problems of affecting the peak power protection threshold, difficult accurate and effective protection, loss of meaning of protection, etc., to achieve smooth random fluctuations, avoid misoperation, and optimize The effect of the time constant

Inactive Publication Date: 2016-01-06
SUNWAVE COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above characteristics will affect the selection of the peak power protection threshold: if the level standard during the frame header period is used as the threshold, it is possible that the protection will not be activated until the average power during the frame body period increases by more than 3dB, and the meaning of protection will be lost
If the level during the frame body is used as the threshold, it is easy to trigger a false action when the frame header appears
Therefore, for digital TV broadcasting standards, it is difficult to achieve accurate and effective protection by using existing over-excitation or overload protection schemes.

Method used

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  • A Power Overshoot Protection Circuit for Digital TV Power Amplifier
  • A Power Overshoot Protection Circuit for Digital TV Power Amplifier
  • A Power Overshoot Protection Circuit for Digital TV Power Amplifier

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. While the invention will be described in conjunction with the preferred embodiments, it will be understood that it is not intended to limit the invention to the described embodiments. On the contrary, the invention is to cover alternatives, modifications and equivalents, which may be included within the scope of the invention as defined by the appended claims.

[0024] The power overshoot protection circuit proposed by the present invention, such as figure 2 As shown, it includes an average power detection circuit 21 and an overshoot detection circuit 22.

[0025] The input signal 23 of the average power detection circuit is taken from the directional coupler at the input end or output end of the power amplifier, and is used for overshoot detection of excitation power or load reflected power respectively. The average power detection circuit can be real...

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Abstract

The invention discloses a power overshoot protection circuit for a digital television power amplifier, which comprises a power detection circuit and an overshoot detection circuit, wherein the time constant of the power detection circuit is controlled by an external discrete device, and the power detection circuit is used for selecting the time constant to ensure that power overshoot of digital television signals of different modes can be detected; and the overshoot detection circuit comprises a see-saw amplifier with a high pass characteristic, a hysteresis comparator, a reference voltage source and a reset circuit. The power overshoot protection circuit has the beneficial effects that the time constant of the power detection circuit is optimally designed, the smooth function is taken on the random fluctuation of the signal amplitude, meanwhile, the characteristic of power overshoot is kept, so that the false operation due to the pseudorandomness of the digital television signal can be avoided, the detection of the power overshoot can be realized; the circuit is simple; the cost is low; and the power overshoot protection circuit can be conveniently suitable for an emitting system power amplifier adopting the China digital television standard.

Description

technical field [0001] The invention relates to a power overshoot protection circuit, more specifically, it relates to a power overshoot protection circuit for a digital TV power amplifier. Background technique [0002] In medium-power (hundred watts) and high-power (several kilowatts) digital TV wireless transmission systems, the RF power amplifier is in a high-energy, high-heat working state, and is one of the components with a high failure rate. Once the RF power amplifier fails, the transmission power will drop or even disappear, resulting in bad or off-broadcast accidents. In the RF power amplifier, the final high-power transistor is the most easily damaged part. The main causes of damage to high-power transistors include: overheating, overdrive, and overload. [0003] The overheating time of the transistor due to the failure of the heat dissipation system is generally on the order of seconds. By monitoring the working status of the heat dissipation system and the tem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/52
Inventor 刘宁靳会蕊张小龙黄传彬
Owner SUNWAVE COMM
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