CN205566627U

CN205566627U - Low -power audio frequency control system

Info

Publication number: CN205566627U
Application number: CN201620321586.6U
Authority: CN
Inventors: 林丽玲
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-04-18
Filing date: 2016-04-18
Publication date: 2016-09-07
Anticipated expiration: 2026-04-18

Abstract

The utility model discloses a low -power audio frequency control system, including triode VT1, triode VT2, resistance R1, electric capacity C1, potentiometre RP1 and speaker B, resistance R1 one end connect respectively VCC, resistance R2, triode VT3 collecting electrode and resistance R3, the resistance R2 other end connect triode VT3 base, and triode VT3 projecting pole is connecting resistance R8 and triode VT5 base respectively. The utility model discloses low -power audio frequency control system, actual measurement the biggest undistorted output voltage's virtual value is 11V, amounts to into output and is about 15W, and the quiescent power dissipation is about 40W, and the highest efficiency is 37.5%, especially adapted using widely.

Description

A kind of low-power audio control system

Technical field

This utility model relates to a kind of control system, specifically a kind of low-power audio control system.

Background technology

Make a general survey of Hi-Fi power amplifier in the market, output more than 100W with class AB amplify product in the majority, in the power amplifier of 50～100W Class A amplify product occupy considerable proportion.From the perspective of high-fidelity, that yes the most a bit is good for the margin of power, if but from the perspective of saving the energy, just it is worthy of consideration.Owing to the efficiency of pure class a audio power amplifier is the lowest, so while you appreciate beautiful music, there are about percent seventy or eighty above electric energy and become heat and dissipate.One every sound channel output is the pure class a audio power amplifier of 50W, if its efficiency in terms of 30%, then quiescent dissipation just has 330W big.Although the tone color that a lot of people are pure class a audio power amplifier is toppled over, but also tending to the duty " had a high fever " because of it and part reluctantly with what one treasures, power consumption is the most also the deadly defect of electronic tube power amplifier.

According to China's national situation, the floor space of general wage-earners is many below 20 square metres, and generally doubles as listening room with parlor or bedroom.If the sensitivity of audio amplifier is at more than 89dB, then the pure class a audio power amplifier of 10～20W just can meet and typically appreciates requirement.If in such environment, the ear of let us bears big volume for a long time in dancing hall, audition will be faded.Say again, noisy that neighbours is much troubled, the most improper.Thus, if producing some power preferable power amplifier of sound quality at about 15W, quiescent dissipation, at below 100W, has market certainly.Unfortunate this kind of power amplifier is a blank, and Japan's siren has a A20, every sound channel pure class a audio power amplifier 20W, and tonequality is celebrated, but price makes us hanging back, now, the producer of domestic production power amplifier seems unrealistically comparing, power does bigger and bigger, and weight is done heavier and heavier, but market may not be certain fine.

Utility model content

The purpose of this utility model is to provide a kind of low-power audio control system, with the problem solving to propose in above-mentioned background technology.

For achieving the above object, the following technical scheme of this utility model offer:

nullA kind of low-power audio control system，Including audion VT1、Audion VT2、Resistance R1、Electric capacity C1、Potentiometer RP1 and speaker B，Described resistance R1 one end connects power supply VCC respectively、Resistance R2、Audion VT3 colelctor electrode and resistance R3，Resistance R2 other end connecting triode VT3 base stage，Audion VT3 emitter stage connects resistance R8 and audion VT5 base stage respectively，Audion VT5 colelctor electrode connects the resistance R3 other end，Audion VT5 emitter stage connects speaker B respectively、Audion VT6 colelctor electrode and potentiometer RP1 one end，The potentiometer RP1 other end connects potentiometer RP1 slide plate respectively、Electric capacity C2 and audion VT2 base stage，Audion VT2 emitter stage connects the resistance R1 other end and audion VT1 emitter stage respectively，Audion VT1 base stage connects electric capacity C1 and resistance R4 respectively，The electric capacity C1 other end connects input signal Vi，The resistance R4 other end connects resistance R5 respectively、Resistance R6、The electric capacity C2 other end、Resistance R7、Audion VT6 emitter stage and the speaker B other end，Audion VT6 base stage connects the resistance R7 other end and audion VT4 emitter stage respectively，Audion VT4 base stage connects the resistance R5 other end and audion VT1 colelctor electrode respectively，Described resistance R6 other end connecting triode VT2 colelctor electrode.

As further program of the utility model: described input signal Vi is audio signal.

As further program of the utility model: described power supply VCC voltage is 15V.

As this utility model further scheme: the amplification of described audion VT1 is β 1=100, the amplification β 2=110 of audion VT2, the amplification β 3=80 of audion VT3, the amplification β 4=100 of audion VT4, the amplification β 6=90 of the amplification β 5=70 of audion VT5, audion VT6.

Compared with prior art, the beneficial effects of the utility model are: this utility model low-power audio control system, and the virtual value of actual measurement maximum nondistortion output voltage is 11V, it is converted into output and is about 15W, quiescent dissipation is about 40W, and peak efficiency is 37.5%, is especially suitable for promoting the use of.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of low-power audio control system.

Detailed description of the invention

Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of this utility model protection.

nullRefer to Fig. 1，In this utility model embodiment，A kind of low-power audio control system，Including audion VT1、Audion VT2、Resistance R1、Electric capacity C1、Potentiometer RP1 and speaker B，Described resistance R1 one end connects power supply VCC respectively、Resistance R2、Audion VT3 colelctor electrode and resistance R3，Resistance R2 other end connecting triode VT3 base stage，Audion VT3 emitter stage connects resistance R8 and audion VT5 base stage respectively，Audion VT5 colelctor electrode connects the resistance R3 other end，Audion VT5 emitter stage connects speaker B respectively、Audion VT6 colelctor electrode and potentiometer RP1 one end，The potentiometer RP1 other end connects potentiometer RP1 slide plate respectively、Electric capacity C2 and audion VT2 base stage，Audion VT2 emitter stage connects the resistance R1 other end and audion VT1 emitter stage respectively，Audion VT1 base stage connects electric capacity C1 and resistance R4 respectively，The electric capacity C1 other end connects input signal Vi，The resistance R4 other end connects resistance R5 respectively、Resistance R6、The electric capacity C2 other end、Resistance R7、Audion VT6 emitter stage and the speaker B other end，Audion VT6 base stage connects the resistance R7 other end and audion VT4 emitter stage respectively，Audion VT4 base stage connects the resistance R5 other end and audion VT1 colelctor electrode respectively，Described resistance R6 other end connecting triode VT2 colelctor electrode；Described input signal Vi is audio signal；Described power supply VCC voltage is 15V；The amplification of described audion VT1 is β 1=100, the amplification β 4=100 of the amplification β 3=80 of the amplification β 2=110 of audion VT2, audion VT3, audion VT4, the amplification β 6=90 of the amplification β 5=70 of audion VT5, audion VT6.

Operation principle of the present utility model is: refer to Fig. 1, differential amplifier circuit is formed by VT1, VT2, R5 is the collector load resistor of VT1, VT1 and to promote between level VT4 be direct-coupling, the push-pull circuit that output stage is made up of NPN type high power transistor VT5, VT6 that two models are identical, outlet tube VT6 is common emitter circuit for speaker B, VT5 is then emitter output circuit, is asymmetric amplification the most herein.VT4 and peripheral cell composition thereof collect-penetrate partition type phase inverter, a pair signal equal in magnitude, in opposite direction is exported respectively by its collector and emitter, VT4 is emitter output circuit for outlet tube VT6, voltage amplification factor is less than 1, is added to output from the signal of VT4 colelctor electrode output and promotes the base stage of pipe VT3.nullFor AC signal，R8 is that the emitter junction resistance with VT3 is in parallel，VT3 and VT5 forms same polarity Darlington formula multiple tube，Therefore the upper arm recommending amplification is by one-level total radio amplifier (VT4) and two grades of emitter output circuit (VT3、VT5) constitute，The underarm of push-pull circuit is then to be made up of one-level emitter output circuit (VT4) and one-level total radio amplifier (VT6)，Visible is asymmetric push-pull amplifier circuit，Therefore when selecting amplifier tube，The current amplification factor of these several pipes also need not match，In this utility model, the amplification of audion VT1 is β 1=100，The amplification β 2=110 of audion VT2，The amplification β 3=80 of audion VT3，The amplification β 4=100 of audion VT4，The amplification β 5=70 of audion VT5，The amplification β 6=90 of audion VT6，That is，Pipe bigger for β value is given priority in arranging for as VT4 and VT6，The open-loop voltage amplification of this power amplifier is about 550，Magnifying power for closed-loop voltage is determined by R4 and R5，The virtual value of this utility model actual measurement maximum nondistortion output voltage is 11V，It is converted into output and is about 15W，Quiescent dissipation is about 40W，Therefore peak efficiency is 37.5%.

It is obvious to a person skilled in the art that this utility model is not limited to the details of above-mentioned one exemplary embodiment, and in the case of without departing substantially from spirit or essential attributes of the present utility model, it is possible to realize this utility model in other specific forms.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims rather than described above, it is intended that all changes fallen in the implication of equivalency and scope of claim included in this utility model.Should not be considered as limiting involved claim by any reference in claim.

In addition, it is to be understood that, although this specification is been described by according to embodiment, but the most each embodiment only comprises an independent technical scheme, this narrating mode of description is only for clarity sake, description should can also be formed, through appropriately combined, other embodiments that it will be appreciated by those skilled in the art that as an entirety, the technical scheme in each embodiment by those skilled in the art.

Claims

null1. a low-power audio control system，Including audion VT1、Audion VT2、Resistance R1、Electric capacity C1、Potentiometer RP1 and speaker B，It is characterized in that，Described resistance R1 one end connects power supply VCC respectively、Resistance R2、Audion VT3 colelctor electrode and resistance R3，Resistance R2 other end connecting triode VT3 base stage，Audion VT3 emitter stage connects resistance R8 and audion VT5 base stage respectively，Audion VT5 colelctor electrode connects the resistance R3 other end，Audion VT5 emitter stage connects speaker B respectively、Audion VT6 colelctor electrode and potentiometer RP1 one end，The potentiometer RP1 other end connects potentiometer RP1 slide plate respectively、Electric capacity C2 and audion VT2 base stage，Audion VT2 emitter stage connects the resistance R1 other end and audion VT1 emitter stage respectively，Audion VT1 base stage connects electric capacity C1 and resistance R4 respectively，The electric capacity C1 other end connects input signal Vi，The resistance R4 other end connects resistance R5 respectively、Resistance R6、The electric capacity C2 other end、Resistance R7、Audion VT6 emitter stage and the speaker B other end，Audion VT6 base stage connects the resistance R7 other end and audion VT4 emitter stage respectively，Audion VT4 base stage connects the resistance R5 other end and audion VT1 colelctor electrode respectively，Described resistance R6 other end connecting triode VT2 colelctor electrode.
Low-power audio control system the most according to claim 1, it is characterised in that described input signal Vi is audio signal.
Low-power audio control system the most according to claim 1, it is characterised in that described power supply VCC voltage is 15V.
Low-power audio control system the most according to claim 1, it is characterized in that, the amplification of described audion VT1 is β 1=100, the amplification β 2=110 of audion VT2, the amplification β 3=80 of audion VT3, the amplification β 6=90 of the amplification β 5=70 of the amplification β 4=100 of audion VT4, audion VT5, audion VT6.