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AB-class audio amplifier power protector

A protection device and audio technology, applied in the direction of amplifier protection circuit layout, etc., can solve problems such as poor consistency, inaccurate protection function, complex structure of protection circuit, etc., to improve reliability and service life, reduce the probability of burning out, and obviously The effect of economic benefits

Active Publication Date: 2013-06-05
WUXI YOUDA ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The peripheral discrete component protection circuit has a complex structure, poor consistency, and the protection function is not accurate enough; the dedicated power amplifier protection circuit has more functions than the discrete component circuit, and the implementation accuracy is higher, and the consistency has been greatly improved, but an additional IC is required

Method used

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  • AB-class audio amplifier power protector
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Embodiment Construction

[0013] Such as figure 1 shown, Upper tube protection: R1 is an aluminum wire resistor, when the output current has a small voltage drop on it, T3, T4, R1, R3 form a micro current source, T4 current is very small, and the voltage drop on resistor R5 is less than Vbe, so T6 has no current, The collector of T6 is connected to the drive current of the output upper tube, and the drive current remains unchanged at this time; when the output current increases, the voltage drop of the aluminum wire resistance R1 becomes larger, the base potential of T3 decreases, the current of T4 becomes larger, and the voltage drop of R5 becomes larger. T5 and T6 are turned on, and the current of T6 is the same as the current of T4. This current is provided by the output upper tube drive current, so the output drive current decreases, and the output current decreases. After the feedback of this loop, it reaches a balance value, which is the upper tube Protection current value. Resistors R3, R4, ...

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Abstract

The invention provides an AB-class audio amplifier power protector, comprising an aluminum wire resistor for detecting currents of output tubes, a micro-current source circuit of a low-voltage transfer current and a current threshold detection module as well as a module for controlling an output drive current. The audio amplifier power protector is mainly characterized in that the aluminum wire resistor is used to detect an output current and starts an overcurrent protection function; and the differential pressure of output tube CEs is used to control the output overvoltage protection of the output current. An output overcurrent protection module mainly uses the reduction voltage of the current of the output tubes on the aluminum wire resistor to actuate the micro current source output current to be enlarged; when the current is more than a threshold value, a current mirror works and outputs part of drive current after the output tubes are pulled off, thus realizing the restriction ofthe output current; and the output overvoltage protection uses two divider resistors which are connected between the output tube CEs in parallel, when the voltage on the low resistor is enlarged, theoutput current of the micro current source module is changed, thus reducing output of the drive current, thereby avoiding that the output tubes output too large currents when the differential pressure is too large.

Description

technical field [0001] The invention is a power protection device for high-power amplifiers realized by detecting output tube current, and belongs to the technical field of integrated circuit design. Background technique [0002] Audio amplifiers are widely used in electronic systems such as home theaters, audio systems, stereo players, and servo amplifiers. While people are pursuing high-fidelity audio power amplifiers, they also hope that the power amplifiers have large output power and high efficiency. [0003] The output current of high-power audio power amplifiers is greater than 1A, and the greater the power, the greater the output current. When a large current flows through the output power tube for a long time, especially when an output short circuit occurs, the output power tube will burn out. Therefore, there must be an overcurrent protection circuit to limit the maximum output current and protect the output tube. Secondly, under different voltage conditions, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/52
Inventor 滕龙张艳丽盛慧红
Owner WUXI YOUDA ELECTRONICS
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