Current limiting power amplification driving circuit for power line carrier communication

A technology of power drive circuit and power line carrier, applied in the direction of power amplifier, amplifier protection circuit layout, etc., can solve problems such as triode overload damage, and achieve the effect of avoiding circuit damage and overload damage

Inactive Publication Date: 2013-10-02
盛吉高科(北京)科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a current-limiting power amplification drive circuit for power line carrier communication, which will solve the problems of the existing power amplification drive circuit for power line carrier communication,

Method used

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  • Current limiting power amplification driving circuit for power line carrier communication
  • Current limiting power amplification driving circuit for power line carrier communication
  • Current limiting power amplification driving circuit for power line carrier communication

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Embodiment Construction

[0032] The circuit diagram of a specific embodiment of the current-limiting power amplification drive circuit for power line carrier communication of the present invention is as follows image 3 shown. The power amplifying circuit of the embodiment of the present invention includes a current-limiting and DC-blocking input circuit, a first-stage bias amplifying circuit, a second-stage current-limiting amplifying circuit, a third-stage power driving circuit, a feedback circuit and a power line carrier signal coupling circuit. The voltage at the power supply terminal VCC is V S = 12V.

[0033] The current-limiting and DC-blocking input circuit of the embodiment of the present invention includes a resistance Ri of 10Ω and a resistance of 0.47 mu The capacitor C1 and the resistor Ri of F are connected to the input terminal of the power amplifier circuit, and the capacitor C1 and the resistor Ri are connected in series to the input terminal of the first stage bias amplifier cir...

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Abstract

The invention relates to a current limiting power amplification driving circuit for power line carrier communication, which is used for realizing power amplification of a power line carrier sending signal and is coupled to a power line. The current limiting power amplification driving circuit is characterized by comprising a current limiting block input circuit, a first-stage bias amplifying circuit, a second-stage current limiting amplifying circuit, a third-stage power driving circuit, a feedback circuit and a power line carrier signal coupling circuit. The current limiting block input circuit in the circuit realizes current limiting protection over the power amplifier current input stage; the base voltage lower limit of a triode Q4 in the third-stage power driving circuit is improved by the second-stage current limiting amplifying circuit, and the maximum base current of the triode Q4 is limited, so that the power amplifier circuit is prevented from entering a working dead zone where the Q4 is connected all the time; the second-stage current limiting amplifying circuit has a current limiting effect on the third-stage power driving circuit, so that the triode therein is prevented from being damaged due to overload; and the circuit is suitable for a variable carrier load impedance condition in an actual application field.

Description

technical field [0001] The invention relates to a current-limiting power amplification drive circuit for power line carrier communication, which belongs to the technical field of power line carrier communication. Background technique [0002] Because power line carrier communication has the characteristics of no need to set up additional communication lines, automatic adaptation to user distribution, low cost, and easy networking, power line carrier communication is currently the preferred solution for low-voltage automatic meter reading communication, and it is also the main method of current distribution network communication. In order to achieve high-quality power line carrier communication effect, the design of the power amplifier drive circuit for the signal sent by power line carrier communication is one of the important issues in the research of power line carrier communication technology. The power amplifier circuit of the power line carrier communication signal need...

Claims

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Application Information

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IPC IPC(8): H03F1/52H03F3/20
Inventor 庞浩李海南都正周陈淘
Owner 盛吉高科(北京)科技有限公司
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