A is classified by working frequency:
Power frequency transformer: working frequency is 50Hz or 60Hz
IF transformer: operating frequency is 400Hz or 1KHz
Audio transformer: operating frequency is 20Hz or 20KHz
Super audio transformer: above 20KHz, no more than 100KHz
High-frequency transformer: The operating frequency is usually above KHz to over 100 KHz.
B is classified by purpose:
Power transformer: a transformer used to supply the power required by electronic equipment
Audio Transformer: Transformer for audio amplifier circuits and audio equipment
Pulse transformer: A transformer that operates in a pulse circuit. The waveform is generally a unipolar rectangular pulse wave.
Special transformer: Transformer with special function, such as parametric transformer, voltage regulator transformer, super isolation transformer, transmission line transformer, leakage transformer
Switching power supply transformer: transformer used in switching power supply circuit
Communication transformer: used for transformers in the communication network that are isolated and filtered
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