High-frequency alternating-current power supply control circuit of electron tube power amplifier

Abstract

The invention discloses a high-frequency alternating-current power supply control circuit of an electron tube power amplifier. A high-frequency alternating-current power supply comprises a [pi]-type filter circuit, a rectifying circuit, a filter circuit, a load circuit, a power-on starting circuit and an oscillating circuit which are connected in sequence, wherein the [pi]-type filter circuit is connected with commercial power, the output end of the power-on starting circuit is connected with the control end of the oscillating circuit, the input end of the oscillating circuit is connected withthe filter circuit, and the output end of the oscillating circuit is connected with the input end of the load circuit. The high-frequency alternating-current power supply control circuit has the advantages that: a novel electron tube filament power supply mode is adopted, and the problems of alternating current hum, low power factor and low efficiency of various power supplies in the prior art are effectively solved through a high-frequency alternating current power supply which has high efficiency and high frequency and does not influence the tone quality and the service life of the electrontube; and meanwhile, the technical problems that electron current emission is influenced by a deflection magnetic field generated by a low-voltage direct-current power supply and the service life ofan electron tube is influenced by weakening electron emission kinetic energy are solved; and key power device protection measures are detailed.

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. 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 reproduce cl...

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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