A High Frequency AC Power Supply Control Circuit for Electron Tube Power Amplifier

Abstract

The invention discloses a high-frequency AC power supply control circuit for an electron tube power amplifier. The high-frequency AC power supply includes a sequentially connected π-type filter circuit, a rectifier circuit, a filter circuit, a load circuit, a power-on start-up circuit and an oscillation circuit; the π-type filter circuit Connected to the mains, the output end of the power-on start-up circuit is connected to the control end of the oscillation circuit, the input end of the oscillation circuit is connected to the filter circuit, and the output end of the oscillation circuit is connected to the input end of the load circuit. Its advantage is that it adopts a new type of electronic tube filament power supply mode, and effectively solves the AC hum of various power sources in the prior art through high-efficiency, high-frequency, high-frequency AC power that neither affects sound quality nor affects the life of the electronic tube. , low power factor and low efficiency; at the same time, it also solves the technical problems that the deflection magnetic field generated by the low-voltage DC power supply affects the electron current emission, and the weakened electron emission kinetic energy affects the life of the electron tube; the key power device protection measures are comprehensive.

Description

technical field [0001] The invention relates to the field of audio power amplifiers, and more specifically relates to a power supply control circuit for filaments of electronic tube power amplifiers. Background technique [0002] In the field of audio power amplifiers (referred to as power amplifiers), at present, according to their power amplifier components, they are mainly divided into two types, namely transistor power amplifiers and tube power amplifiers. Due to its small power, the large dynamic effect of the tube power amplifier is very weak. After the appearance of the transistor power amplifier, because the transistor power amplifier has the characteristics of low cost, small size, and high power, it has a good support for pop music, especially the big dynamic. It has replaced tube amplifiers in the mainstream market. However, because the tube power amplifier also has its unique characteristics, such as the sound is natural and sweet, with "gut taste", it can repro...

AI Technical Summary

Problems solved by technology

Since the core power amplification component used in the tube power amplifier is a tube, and the power supply of the tube filament requires low voltage and high current, the above three methods of power supply have the following disadvantages: the first type of power supply has AC hum (that is, power frequency Interference); the use of the second power supply and the third power supply has the problems of low power factor and low efficiency, and the low-voltage DC power supply will generate a deflection magnetic field that will affect the electron current emission, weaken the electron emission kinetic energy and reduce the service life of the electron tube

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