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Audio transformer classification, function and working principle

163.com | 08/06/2021

Audio transformers are low-frequency transformers, which are mainly used for long-distance broadcast transmission constant-voltage power amplifiers with low sound quality requirements. The transformer connected to the speaker is an audio transformer, and it is also called a power amplifier output transformer. Let's take a look at the classification, function and working principle of audio transformers.

The working principle of audio transformer

Audio transformer is in the audio work, the frequency response of the frequency band in the audio transformer is uniform, so that when the audio is output through the current, it does not cause a signal. The transformer can reduce the interference during audio transportation.

The power transformer works at a fixed frequency, such as 50Hz, 60Hz, etc. The audio transformer works in a wider frequency band, such as the audio frequency range of 50~2000Hz. The leakage inductance and distributed capacitance of the transformer are negligible in the power transformer, and in the audio transformer, especially at the high frequency end, it becomes the main factor that determines its electrical indicators, so certain measures need to be taken to reduce the leakage inductance and Distributed capacitance.

Audio transformer is an integral part of the audio amplifier, so it is necessary to determine the main parameters of the transformer, but also to study the relationship between the amplifier and the audio transformer.

According to the position and function in the amplifier, it can be divided into input transformer, output transformer, inter-line transformer, inter-stage transformer, etc. There are other special transformers used in special occasions.

Audio transformer classification

frequency transformers can be divided into 3 categories according to their position in the electronic circuit.

Connected between the output circuit and the load is called the output transformer;

The one connected between the signal source and the input of the amplifier is called the input transformer;

is connected between the output circuit of the previous stage and the input circuit of the next stage is called an inter-stage transformer.

When using, pay attention to the matching of front and rear impedance to avoid signal distortion due to reflection. In order to make the load get the maximum power, the load impedance should be the same as the impedance required by the power amplifier stage after transformation through the impedance of the output transformer, and it should not be too large or too small. After the audio signal is amplified by the audio transformer, although the voltage can be increased, the power is reduced due to the loss of the transformer. In this way, it cannot drive a larger load. Therefore, audio transformers cannot replace electronic audio signal amplifiers.

Audio transformer function

Audio transformer can realize voltage converter conversion like a power transformer, and can also realize audio signal coupling. There are four main functions of audio transformers:

Output transformer: Used in audio equipment and playback equipment, it plays an impedance transformation role in the circuit.

Input transformer: The main function is when the sound signal is input, and it acts as an impedance transformation in the circuit.

Inter-stage transformer: The common inter-stage transformer can make all levels of work units in the amplifier reconcile.

Line-to-line transformer: Line-to-line transformers are often used in cable broadcasting equipment. Because there are often many high-power amplifiers on the working unit of cable broadcasting, and the line is long, long-distance audio transmission will cause audio distortion.

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