Power supply processing circuit

Abstract

This invention relates to a power supply process circuit including a rectifying and filtering circuit rectifying and filtering AC commercial power to get stable pulse DC power, a start-up protection circuit, a phase-change circuit and a bridge self-oscillation circuit connected with the rectifying and filtering circuit, in which, the pulse DC power is loaded on said start-up protection circuit and th balance bridge circuit to start up the phase-change circuit by the start-up protection circuit to further start up the bridge self-oscillation circuit to amplify and filter the pulse DC power loaded on itself, then the feed-back winding of the phase change circuit is coupled with the self-oscillation circuit to get electric signals, and the phase-change circuit loads said signals on the bridge self-oscillation circuit to control and balance the bridge circuit to amplify and filter the DC power loaded on itself.

Description

technical field [0001] The invention relates to a power processing circuit, in particular to a power processing circuit capable of purifying, stabilizing and transforming the power. Background technique [0002] As we all know, power pollution will cause serious harm to electrical equipment, such as interfering with the normal operation of communication equipment, causing data loss, affecting the performance of radar systems, and causing image disorder, and its impact on audio systems is beyond help. Taking the electronic tube amplifier in the audio system as an example, the current power supply of the electronic tube amplifier on the market is powered by the mains (frequency is 50 Hz), and it is directly and simply processed by a power supply device composed of a transformer, a diode bridge and a capacitor. It is directly supplied to the tube amplifier circuit. In this process, since it is impossible to completely filter out the noise in the AC mains, and then "pollute" th...

AI Technical Summary

Problems solved by technology

However, the transformer has many disadvantages. First, not only does the weight and volume of the transformer need to be large in order to obtain a high transformation ratio, causing the amplifier to become very bulky, but the transformer also limits the output frequency range of the amplifier; secondly, due to the large inductive reactance of the transformer , its own line resistance, so the internal resistance of the power supply to the amplifier circuit is large, and the characteristics of the inductive reactance itself make the speed of the power supply to the amplifier seriously insufficient, which is manifested in the amplitude distortion of the large signal; again, the transformer coil and magnetic core The loss in the power supply (usually the power loss is about 15%-20% after the power supply is transformed by the transformer), which reduces the efficiency of the amplifier

Of course, there is also a method of using a switching power supply. Compared with a transformer, a switching power supply can improve the signal, but because it needs to use a complex control circuit, it is expensive and has limited power.

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