CN200962580Y

CN200962580Y - Self-surge audio amplifier

Info

Publication number: CN200962580Y
Application number: CN 200620136960
Authority: CN
Inventors: 陈敏雄; 钟尚书; 黎明宗
Original assignee: Princeton Technology Corp
Current assignee: Princeton Technology Corp
Priority date: 2006-10-19
Filing date: 2006-10-19
Publication date: 2007-10-17
Anticipated expiration: 2016-10-19

Abstract

An audio amplifier comprises a plurality of audio amplifier subunits, a clock incoming source, and a reproducer. When the audio amplifier is working in the normal audio amplifying mode, a plurality of subunits of the audio amplifier will be operated under synchronizing frequency owning to a clock signal inputted by the clock incoming source and when the audio amplifier is working in a self-oscillation mode, the clock signal inputted into the subunits of the audio amplifier will be obstructed and a less distortion can be obtained by charging and discharging of the oscillating capacity repeatedly contained in the audio amplifier of the audio amplifier subunits.

Description

Can the self-audio amplifier that vibrates

Technical field

The utility model relates to a kind of audio amplifier, particularly relates to a kind of audio amplifier that can oneself vibration.

Background technology

At present general employed audio amplifier nearly all is to be that main flow is come in addition real the work with the D class A amplifier A.Adopted in the past class ab ammplifier produced is linear signal, what the D class A amplifier A was produced then is that (it mainly comprises audio signal and PWM switch signal and harmonic wave for Pulse-Width Modulation, PWM) signal in pulse width modulation.In the work of D class A amplifier A, the output stage mos field effect transistor of D class A amplifier A (Metal-Oxide SemiconductorField-Effect Transistor) can switch to utmost point Low ESR from high impedance, the time of (active region) has only the short several seconds in the service area, so the consume of the output-stage power of D class A amplifier A is far below class ab ammplifier.In addition, inductor-capacitor formula (LC) filter that the D class A amplifier A comprises itself can store enough energy in each cycle of D class A amplifier A work, so that the loud speaker that the power of switch can not connected after D class A amplifier A consume.

Yet, use at the same time under the situation of a plurality of D class A amplifier As, if the output message of each D class A amplifier A can't reach conforming synchronous effect, then be easy to produce unnecessary noise, tonequality also can be greatly affected, and if there is not the frequency of operation of suitable control D class A amplifier A, then the D class A amplifier A very easily is subjected to other and has interference of noise near frequency of operation.Continue at needs under the situation of output audio signals, continue the distortion that the input audio signals also causes before having imported audio signals easily, further influence the sound quality of whole D class A amplifier A system.

The utility model content

The utility model provides a kind of audio amplifier that can oneself vibration, comprise a plurality of consonant news amplifier groups, a clock input source and a loud speaker, the clock input source is coupled to a plurality of clock diverter switches of a plurality of consonant news amplifier groups, and loud speaker is coupled to second end of the inductance of each consonant news amplifier group in a plurality of consonant news amplifier groups.Each consonant news amplifier group comprises consonant news amplifier, a message input source, a clock diverter switch, a predriver, a transistor group, an inductance and one second electric capacity.The message input source is coupled to the message input of this consonant news amplifier.The clock diverter switch is coupled to the input end of clock of this consonant news amplifier, and predriver is coupled to the message output of this consonant news amplifier.The first input end of transistor group is coupled to first output of this predriver, and second input is coupled to second output of this predriver.First end of inductance is coupled to the output of this transistor group.First end of second electric capacity is coupled to one second end of this inductance, and the second end ground connection.This consonant news amplifier comprises one first comparator, one first resistance, one second resistance, one the 3rd resistance, one second comparator and one first electric capacity.The positive input terminal of first comparator is coupled to a reference voltage source.First end of first resistance is coupled to the negative input end of this first comparator, and second end is coupled to a message input of this consonant news amplifier.First end of second resistance is coupled to the negative input end of this first comparator.First end of the 3rd resistance is coupled to the negative input end of this first comparator, and second end is coupled to a back coupling input of this consonant news amplifier.The negative input end of second comparator is coupled to this reference voltage source, and positive input terminal then is coupled to the output of this first comparator, and output is coupled to the message output of this consonant news amplifier.First end of first electric capacity is coupled to the negative input end of this first comparator, and second end is coupled to the positive input terminal of this second comparator.

Description of drawings

Fig. 1 is the schematic diagram of audio amplifier of the present utility model.

The consonant news amplifier that Fig. 2 comprises for the audio amplifier of Fig. 1 and the schematic diagram of clock diverter switch.

The reference numeral explanation

100 audio amplifiers

102 consonants news amplifier group

104 message input sources

106 consonants news amplifier

108 predrivers

110 transistor groups

112 filter inductance

114 filter capacities

116 clock input sources

118 clock selecting switches

120 loud speakers

122,132 comparators

124,126,130 resistance

128 clock diverter switches

134 oscillating capacitances

140,142 transistors

144 voltage sources

The VREF reference voltage source

Embodiment

See also Fig. 1, it is the schematic diagram of audio amplifier 100 of the present utility model.As shown in Figure 1, audio amplifier 100 comprises a plurality of consonant news amplifier group 102, one clock input sources 116, and a loud speaker 120.Each consonant news amplifier group 102 comprises consonant news amplifier 106, one message input sources 104, one predrivers 108, one transistor groups 110, one filter inductance 112, one filter capacities 114, and a clock diverter switch 128.Message input source 104 is coupled to a message input (AUDIO IN as shown in Figure 1) of consonant news amplifier 106.Predriver 108 is coupled to a message output (AUDIO OUT as shown in Figure 1) of consonant news amplifier 106.Transistor group 110 comprises a first input end, is coupled to one first output of predriver 108, and one second input, is coupled to one second output of predriver 108.Filter inductance 112 comprises one first end, is coupled to an output of transistor group 110.Filter capacity 114 comprises one first end, is coupled to one second end of filter inductance 112, and second end of a ground connection.Wherein, filter inductance 112 is to be used for forming a filter with filter capacity 114, to filter out the frequency beyond the particular range in the output signal.Clock diverter switch 128 is coupled to a clock input (CLK IN shown in Figure 1) of consonant news amplifier 106.See also Fig. 2, it interrogates the schematic diagram of amplifier 106 and clock diverter switch 128 for the consonant that the audio amplifier 100 of Fig. 1 comprises, and please consults Fig. 1 simultaneously.Consonant news amplifier 106 comprises one first comparator, 122, one first resistance, 124, one second resistance 126, the 3rd resistance, 130, one second comparators 132, and an oscillating capacitance 134.First comparator 122 comprises a positive input terminal, is coupled to a reference voltage source VREF.One first end of first resistance 124 is coupled to a negative input end of first comparator 122, and one second end of first resistance 124 is coupled to the message input (Fig. 1 and AUDIO IN shown in Figure 2) of consonant news amplifier 106.One first end of second resistance 126 is coupled to the negative input end of first comparator 122.One first end of the 3rd resistance 130 is coupled to second end of second resistance 126, and one second end of the 3rd resistance 130 is coupled to a back coupling input (Fig. 1 and FB shown in Figure 2) of consonant news amplifier 106.One negative input end of second comparator 132 is coupled to reference voltage source VREF, one positive input terminal of second comparator 132 is coupled to an output of first comparator 122, and an output of second comparator 132 is coupled to the message output (Fig. 1 and AUDIO OUT shown in Figure 2) of consonant news amplifier 106.One first end of oscillating capacitance 134 is coupled to the negative input end of first comparator 122, and one second end of oscillating capacitance 134 is coupled to the positive input terminal of second comparator 132.Clock input source 116 is coupled to the clock diverter switch 128 of each consonant news amplifier group 102.Loud speaker 120 is coupled to second end of the filter inductance 112 of each consonant news amplifier group 102.Transistor group 110 comprises a first transistor 140 and a transistor seconds 142.The grid of the first transistor 140 is coupled to the first input end of transistor group 110, and source electrode is coupled to a voltage source 144, and drain electrode is coupled to the output of transistor group 110.The grid of transistor seconds 142 is coupled to second input of transistor group 110, source ground, and drain electrode is coupled to the output of transistor group 110.Transistor group 110 is used for forming an output amplifier stage, to amplify the signal of being exported by predriver 108.Clock input source 116 comprises a plurality of period of the day from 11 p.m. to 1 a.m clock input source CLK ₁, CLK ₂..., CLK _n, and a clock selector switch 118.Clock selecting switch 118 is coupled to a plurality of period of the day from 11 p.m. to 1 a.m clock input source CLK ₁, CLK ₂..., CLK _nA period of the day from 11 p.m. to 1 a.m clock input source, use from selecting a period of the day from 11 p.m. to 1 a.m clock input source in these a plurality of period of the day from 11 p.m. to 1 a.m clock input sources, and the clock that the period of the day from 11 p.m. to 1 a.m clock input source of selecting produces inputed to consonant news amplifier 106.

Transistor group 110 shown in Figure 1 only is a preferred embodiment of the present utility model, and any other embodiment that can be used to place of transistor group 110 still belongs to category of the present utility model.Predriver 108 shown in Figure 1 also is common predriver, therefore predriver 108 is replaced by other assembly that has with predriver 108 identical functions and does not also constitute the disengaging fact of the present utility model.The consonant news amplifier 106 of Fig. 1 is a D class A amplifier A, and consonant shown in Figure 2 news amplifier 106 only be a preferred embodiment of the present utility model, so consonant is interrogated amplifier 106 can be used to implement the assembly of function of D class A amplifier A or circuit with other and substitute and also be contained in category of the present utility model.

Audio amplifier 100 of the present utility model comprises two kinds of mode of operations, a kind of is the message amplification mode, is used for the message of input is converted to the pulse width modulation signal, and another kind is self-oscillation mode, under the state of not importing audio signals, form oneself's vibration, to obtain lower distortion.

Audio amplifier 100 of the present utility model is when carrying out the message amplification mode, except meeting is interrogated in the amplifier group 102 by message input source 104 input audio signals to consonants, also can be by clock input source 116 inputs one clock signal, with the frequency of operation of control consonant news amplifier group 102.By the conducting of clock diverter switch 128 or close, choose the consonant news amplifier group 102 (also can choose whole consonant news amplifier groups 102) of desiring to operate in normal message amplification mode, then by clock input source 116 input clock signals, so that clock diverter switch 128 is in conducting state, this moment, consonant was interrogated the state that amplifier group 102 is in clock synchronization.Thus, when last output pulse width modulating signal and and then when sounding by loud speaker 120, each the output pulse width modulating signal that concentrates on loud speaker 120 can not produce noise, and better tone quality is arranged also for synchronously.In an embodiment of the present utility model, the message that message input source 104 is imported is square-wave signal, to help the frequency of operation of each consonant news amplifier group 102 of Synchronization Control.

Clock input source 116 employed period of the day from 11 p.m. to 1 a.m clock input sources can be chosen by clock selecting switch 118, so that each consonant of Synchronization Control news amplifier group 102 can be according to different situations, are in the frequency of proper handling.For instance, sometimes if consonant is interrogated the frequency of operation of amplifier group 102 too in the wireless signal near the general broadcast channel, then very easily be subjected to it and disturb, therefore can select a better suited period of the day from 11 p.m. to 1 a.m clock input source to avoid this type of interference by the switching of clock selecting switch 118.

When audio amplifier 100 of the present utility model is carried out self-oscillation mode, to close the mode of clock diverter switch 128, the clock signal that is input into each consonant news amplifier group 102 is isolated, and the audio signals that will before import is feedback to consonant news amplifier 106 in the feedback signal that output produced of transistor group 110, with the charge and discharge that oscillating capacitance 134 is repeated, form oneself's vibration.When carrying out self-oscillation mode, the frequency of oscillation of consonant news amplifier group 102 is to determine jointly with oscillating capacitance 134 by the 3rd resistance 130, therefore the oneself's vibration that continues can make the intensity and the frequency of output audio signals remain in certain scope, to realize the effect than low distortion.

Audio amplifier of the present utility model is under normal message amplification mode, and each consonant news amplification group is in addition synchronous with unified clock signal, when asynchronous, can produce the shortcoming of noise with the frequency of operation that solves a plurality of D class A amplifier As.By the situation of looking at any time suitable choose different period of the day from 11 p.m. to 1 a.m clock input sources, audio amplifier of the present utility model can avoid having the interference of noise of similar frequency.Audio amplifier of the present utility model is under self-oscillation mode, can come charge and discharge that oscillating capacitance is repeated by the feedback signal that audio signals produced of previous input, so that the intensity and the frequency of output audio signals remain in certain scope, and realization is than the effect of low distortion.

The above only is preferred embodiment of the present utility model, and all equalizations of doing according to claim of the present utility model change and modify, and all should belong to covering scope of the present utility model.

Claims

One kind can oneself vibration audio amplifier, it is characterized in that comprising:

A plurality of consonant news amplifier groups, each consonant news amplifier group comprises:

One consonant news amplifier comprises:

One first comparator, its positive input terminal is coupled to a reference voltage source;

One first resistance, its first end is coupled to the negative input end of this first comparator, and second end is coupled to a message input of this consonant news amplifier;

One second resistance, its first end is coupled to the negative input end of this first comparator;

One the 3rd resistance, its first end is coupled to the negative input end of this first comparator, and second end is coupled to a back coupling input of this consonant news amplifier;

One second comparator, its negative input end is coupled to this reference voltage source, and positive input terminal is coupled to the output of this first comparator, and output is coupled to the message output of this consonant news amplifier; And

One first electric capacity, its first end is coupled to the negative input end of this first comparator, and second end is coupled to the positive input terminal of this second comparator;

One message input source is coupled to the message input that this consonant is interrogated amplifier;

One clock diverter switch is coupled to the input end of clock that this consonant is interrogated amplifier;

One predriver is coupled to the message output that this consonant is interrogated amplifier;

One transistor group, its first input end are coupled to first output of this predriver, and second input is coupled to second output of this predriver;

One inductance, its first end is coupled to the output of this transistor group; And

One second electric capacity, its first end are coupled to one second end of this inductance, and the second end ground connection;

One clock input source is coupled to a plurality of clock diverter switches that these a plurality of consonants are interrogated the amplifier groups; And

One loud speaker is coupled to second end that these a plurality of consonants are interrogated the inductance of each consonant news amplifier group in amplifier groups.
2. audio amplifier as claimed in claim 1 is characterized in that this transistor group comprises:

One the first transistor, its grid is coupled to the first input end of this transistor group, and source electrode is coupled to a voltage source, and drain electrode is coupled to the output of this transistor group; And

One transistor seconds, its grid are coupled to second input of this transistor group, source ground, and drain electrode is coupled to the output of this transistor group.
3. audio amplifier as claimed in claim 1 is characterized in that this clock input source comprises:

A plurality of period of the day from 11 p.m. to 1 a.m clock input sources; And

One clock selector switch is coupled to the period of the day from 11 p.m. to 1 a.m clock input source in these a plurality of period of the day from 11 p.m. to 1 a.m clock input sources, uses from selection one period of the day from 11 p.m. to 1 a.m clock input source in these a plurality of period of the day from 11 p.m. to 1 a.m clock input sources, and imports the clock of the period of the day from 11 p.m. to 1 a.m clock input source generation of selecting.