CN207869069U - A kind of CLASSD audio frequency power amplifiers pre-driver circuit and audio frequency power amplifier - Google Patents
A kind of CLASSD audio frequency power amplifiers pre-driver circuit and audio frequency power amplifier Download PDFInfo
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- CN207869069U CN207869069U CN201820171045.9U CN201820171045U CN207869069U CN 207869069 U CN207869069 U CN 207869069U CN 201820171045 U CN201820171045 U CN 201820171045U CN 207869069 U CN207869069 U CN 207869069U
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Abstract
The utility model discloses a kind of CLASSD audio frequency power amplifiers pre-driver circuit and audio frequency power amplifiers, including mutually independent two circuits；One circuit includes input terminal INP, INP is upper and is connected with the grid of p-type field-effect tube P1 and N-type field-effect tube N1, the drain electrode of the source electrode and N1 of the P1 is connect with output end, the grounded drain of P1, the source electrode of N1 is grounded, the substrate of N1 is connect with the grid of N-type field-effect tube N2, and the drain electrode of N2 is connect with output end, the source electrode ground connection of N2；Another circuit includes input terminal INN, INN is upper and is connected with the grid of p-type field-effect tube P2 and N-type field-effect tube N3, the drain electrode of the source electrode and N3 of the P2 is connect with output end, the grounded drain of P2, the source electrode of N3 is grounded, the substrate of P2 is connect with the grid of p-type field-effect tube P3, and the source electrode of P3 is connect with output end, the grounded drain of P3.
Description
Technical field
The utility model is related to a kind of driving circuits, and in particular to a kind of CLASSD audio frequency power amplifiers pre-driver circuit.
Background technology
People stand fast at always the position of A class power amplifiers in field of audio.Think that A class power amplifier sound is the most pure and fresh transparent,
With very high fidelity.But the poor efficiency of A class power amplifiers and high loss are the congenital persistent ailment that it can not overcome.B class power amplifiers
Although efficiency improves very much, actual efficiency is only 50% or so, in small portable stereo set such as vehicle power amplifier, notebook
Computer audio frequency system and professional super high power power amplifier occasion, it is relatively low unsatisfactory still to feel efficiency.So the D of ultrahigh in efficiency
Class power amplifier is just being paid attention to by various aspects because it meets the trend of the green revolution.Due to the development of integrated circuit technique, originally use
No matter the very complicated modulation circuit that discrete component makes, be not a problem technically or in price now.And
The development of digital sound technology in recent years, it has been found that in place of D classes power amplifier has many communicate with digital sound, further display out
The advantages for development of D class power amplifiers.
Existing D classes power amplifier first part is modulator, and simplest need to use amplifier composition comparator can be complete
At.Original audio signal plus the positive input terminal for being placed on amplifier after certain direct current biasing, separately one is generated by self-oscillation
Triangular wave is added to the negative input end of amplifier.When the current potential on anode is higher than negative terminal triangular wave current potential, comparator output is height
Level, it is on the contrary then export low level.If audio input signal is zero, direct current biasing triangle crest value 1/2, comparator output
Low and high level duration it is the same, output is exactly a duty ratio for the square wave of half.When there is audio signal input
When, between positive half period, the time that comparator exports high level is longer than low level, and the duty ratio of square wave is more than half；Negative half
During week, due to there is direct current biasing, so the level of comparator positive input terminal is also greater than zero, but audio frequency signal amplitude is higher than
The time of triangle wave amplitude is but greatly reduced, and duty cycle square wave is less than half.In this way, the waveform of comparator output is exactly one
A pulse width is by the modulated waveform of audio frequency signal amplitude, referred to as PWM (Pulse Width Modulation pulsewidth modulations)
Or PDM (Pulse Duration Modulation pulse length modulaitons) waveform.Audio-frequency information is modulated onto impulse waveform
In.
Second part is exactly D class power amplifiers itself, this is a pulse controlled high-current switch amplifier, and comparator is defeated
The pwm signal gone out become high voltage, high current high-power pwm signal.The maximum power that can be exported is by load, supply voltage
The electric current that is allowed to flow through with transistor determines.
Part III need to restore the acoustic information in high-power PWM waveform.Method is very simple, it is only necessary to one
Low-pass filter.But since electric current is very big at this time, the low-pass filter resistance of reinforced concrete structure can consume energy, and cannot use, it is necessary to use
LC low-pass filters.When the pulse that duty ratio is more than half arrives, the charging time of C is more than discharge time, output electricity
It is flat to rise；When burst pulse arrives, discharge time is long, and output level declines, just consistent with the variation of the amplitude of former audio signal,
So former audio signal is resumed out.
And existing D classes power amplifier output ripple is larger, serious interference, Wen Bo has greatly improved but leads to non-overlapping control
Circuit dead time is long, and circuit dynamic range is poor.
Utility model content
Technical problem to be solved in the utility model is that existing D classes power amplifier output ripple is larger, serious interference, Wen Bo
It has greatly improved but causes non-overlapping control circuit dead time long, circuit dynamic range is poor, and it is an object of the present invention to provide a kind of
CLASSD audio frequency power amplifier pre-driver circuits, solve that existing D classes power amplifier output ripple is larger, and serious interference, Wen Bo has larger
Improvement but cause non-overlapping control circuit dead time long, the poor problem of circuit dynamic range.
The utility model is achieved through the following technical solutions：
A kind of CLASSD audio frequency power amplifiers pre-driver circuit, including mutually independent PREP circuits and PREN circuits；
The PREP circuits include input terminal INP, on the INP and are connected with p-type field-effect tube P1 and N-type field-effect tube N1
Grid, the drain electrode of the source electrode and N1 of the P1 connect with output end OTP jointly, the grounded drain of P1, the source electrode ground connection of N1, N1
Substrate connect with the grid of N-type field-effect tube N2, the drain electrode of N2 is connect with output end OTP, the source electrode of N2 ground connection；
The PREN circuits include input terminal INN, on the INN and are connected with p-type field-effect tube P2 and N-type field-effect tube N3
Grid, the drain electrode of the source electrode and N3 of the P2 connect with output end OTN jointly, the grounded drain of P2, the source electrode ground connection of N3, P2
Substrate connect with the grid of p-type field-effect tube P3, the source electrode of P3 is connect with output end OTN, the grounded drain of P3.
In PREP circuits resistance R1 is provided between the source electrode and the earth of N1 or between the drain electrode and output end OTP of N1；
In PREN circuits resistance R2 is provided between the source electrode and the earth of P2 or between the drain electrode and output end OTP of P2.
The size of P1 is 100u/0.5u, and the size of N1 is 50u/0.5u, and the size of R1=150 Ω, N2 are 10u/0.5u；
The size of N2 is 50u/0.5u, and the size of P1 is 100u/0.5u, and the size of R2=300 Ω, P2 are 10u/0.5u.
Using foregoing circuit, P1 sizes 100u/0.5u keeps PREP rising edges very fast, switch-off power pipe；N1=50u/0.5u,
It R1=150 ohm, N2 10u/0.5u, allows PREP to decline by R1 when PREP declines and relatively delays.When INP voltages are higher, pass through
N2 drop-downs accelerate PREP and decline reduction dead time at this time.N2 sizes 50u/0.5u keeps PREN failing edges very fast, switch-off power pipe；
It P1=100u/0.5u, R2=300 ohm, P2 10u/0.5u, allows PREN to rise by R2 when PREN rises and relatively delays.When INN electricity
When pressing relatively low, PREN is accelerated by P3 pull-up at this time and rises reduction dead time.
A kind of CLASSD audio frequency power amplifiers, including the input of sequentially connected two-way audio, integrator, two-way comparator, two-way
Non-overlapping control circuit, two-way power tube output stage, loudspeaker, are additionally provided between non-overlapping control circuit and power tube output stage
Pre-driver circuit, one non-overlapping control circuit two-way output respectively with the input terminal INP and PREN of PREP circuits
The input terminal INN of circuit is matched one by one, and the output end OTP of the PREP circuits connects difference with the output end OTN of PREN circuits
It is connect with power tube output stage.
The utility model compared with prior art, has the following advantages and advantages：
1, a kind of CLASSD audio frequency power amplifiers pre-driver circuit of the utility model, audio frequency power amplifier output ripple is smaller, interference
It is less；
2, a kind of CLASSD audio frequency power amplifiers pre-driver circuit of the utility model, non-overlapping control circuit dead time is short,
Circuit dynamic range is larger.
Description of the drawings
Attached drawing described herein is used for providing further understanding the utility model embodiment, constitutes the one of the application
Part does not constitute the restriction to the utility model embodiment.In the accompanying drawings：
Fig. 1 is the utility model electrical block diagram；
Fig. 2 is the utility model pre-driver electrical block diagram；
Fig. 3 is tradition D class power amplifier structural schematic diagrams；
Fig. 4 is traditional modified D class power amplifier structural schematic diagrams；
Fig. 5 is the utility model OUTP, OUTN output waveform diagram；
Fig. 6 is tradition D class power amplifier OUTP, OUTN output waveform diagrams.
Specific implementation mode
To make the purpose of this utility model, technical solution and advantage be more clearly understood, with reference to embodiment and attached drawing,
The utility model is described in further detail, and the exemplary embodiment and its explanation of the utility model are only used for explaining this
Utility model is not intended to limit the scope of the present invention.
Embodiment 1
As shown in Figure 1, 2, a kind of CLASSD audio frequency power amplifiers pre-driver circuit of the utility model, including it is mutually independent
PREP circuits and PREN circuits；
The PREP circuits include input terminal INP, on the INP and are connected with p-type field-effect tube P1 and N-type field-effect tube N1
Grid, the drain electrode of the source electrode and N1 of the P1 connect with output end OTP jointly, the grounded drain of P1, the source electrode ground connection of N1, N1
Substrate connect with the grid of N-type field-effect tube N2, the drain electrode of N2 is connect with output end OTP, the source electrode of N2 ground connection；
The PREN circuits include input terminal INN, on the INN and are connected with p-type field-effect tube P2 and N-type field-effect tube N3
Grid, the drain electrode of the source electrode and N3 of the P2 connect with output end OTN jointly, the grounded drain of P2, the source electrode ground connection of N3, P2
Substrate connect with the grid of p-type field-effect tube P3, the source electrode of P3 is connect with output end OTN, the grounded drain of P3.
In PREP circuits resistance R1 is provided between the source electrode and the earth of N1 or between the drain electrode and output end OTP of N1；
In PREN circuits resistance R2 is provided between the source electrode and the earth of P2 or between the drain electrode and output end OTP of P2.
The size of P1 is 100u/0.5u, and the size of N1 is 50u/0.5u, and the size of R1=150 Ω, N2 are 10u/0.5u；
The size of N2 is 50u/0.5u, and the size of P1 is 100u/0.5u, and the size of R2=300 Ω, P2 are 10u/0.5u.
Embodiment 2
A kind of CLASSD audio frequency power amplifiers of the utility model, difference from Example 1 is, including sequentially connected two-way
Audio input, integrator, two-way comparator, the non-overlapping control circuit of two-way, two-way power tube output stage, loudspeaker, feature exist
In being additionally provided with pre-driver circuit between non-overlapping control circuit and power tube output stage, one non-overlapping control electricity
The two-way output on road is matched with the input terminal INN of input terminal INP and the PREN circuit of PREP circuits one by one respectively, the PREP electricity
The output end OTN connections of output end OTP and the PREN circuit on road are connect with power tube output stage respectively.
Embodiment 3
As shown in Figure 3,4, the present embodiment is the comparative example of embodiment 1, and Fig. 2 is traditional pre-driver circuit, by
PMOS tube P1, P2 and NMOS tube N1, N2 composition.Fig. 3 is that the circuit P1, N1, P2, N2 after optimization go here and there have R1 respectively, R2, R3, R4.
R1, R2, R3, R4 make node1, node2, node3, and node4 voltage rising edges and failing edge are relatively slow, therefore OUTP, OUTN are defeated
It is smaller to go out ripple.
Embodiment 4
As shown in Figure 5,6, using MATLAB to the utility model proposes CLASSD audio frequency power amplifiers and tradition CLASSD work(
Putting capable emulation into, Fig. 4 is OUTP in the utility model, and the output waveform of OUTN, Fig. 5 is the OUTP of tradition CLASSD power amplifiers,
OUTN output waveforms；, it is apparent that the output waveform of OUTP in the utility model, OUTN are relative to traditional CLASSD power amplifiers
OUTP, output ripple of the OUTN output waveforms in rising edge end and failing edge starting end be significantly smaller.
Above-described specific implementation mode, to the purpose of this utility model, technical solution and advantageous effect carried out into
One step is described in detail, it should be understood that the foregoing is merely specific embodiment of the present utility model, is not used to limit
Determine the scope of protection of the utility model, within the spirit and principle of the utility model, any modification for being made equally is replaced
It changes, improve, should be included within the scope of protection of this utility model.
Claims (4)
1. a kind of CLASSD audio frequency power amplifiers pre-driver circuit, which is characterized in that including mutually independent PREP circuits and PREN
Circuit；
The PREP circuits include input terminal INP, on the INP and are connected with the grid of p-type field-effect tube P1 and N-type field-effect tube N1
The drain electrode of pole, the source electrode and N1 of the P1 is connect with output end OTP jointly, the grounded drain of P1, the source electrode ground connection of N1, the lining of N1
Bottom is connect with the grid of N-type field-effect tube N2, and the drain electrode of N2 is connect with output end OTP, the source electrode ground connection of N2；
The PREN circuits include input terminal INN, on the INN and are connected with the grid of p-type field-effect tube P2 and N-type field-effect tube N3
The drain electrode of pole, the source electrode and N3 of the P2 is connect with output end OTN jointly, the grounded drain of P2, the source electrode ground connection of N3, the lining of P2
Bottom is connect with the grid of p-type field-effect tube P3, and the source electrode of P3 is connect with output end OTN, the grounded drain of P3.
2. a kind of CLASSD audio frequency power amplifiers pre-driver circuit according to claim 1, which is characterized in that in PREP circuits
It is provided with resistance R1 between the source electrode and the earth of middle N1 or between the drain electrode and output end OTP of N1；The source of P2 in PREN circuits
Resistance R2 is provided between pole and the earth or between the drain electrode of P2 and output end OTP.
3. a kind of CLASSD audio frequency power amplifiers pre-driver circuit according to claim 2, which is characterized in that the size of P1 is
The size of 100u/0.5u, N1 are 50u/0.5u, and the size of R1=150 Ω, N2 are 10u/0.5u；The size of N2 is 50u/0.5u,
The size of P1 is 100u/0.5u, and the size of R2=300 Ω, P2 are 10u/0.5u.
4. a kind of CLASSD audio frequency power amplifiers, including the input of sequentially connected two-way audio, integrator, two-way comparator, two-way are non-
Overlapping control circuit, two-way power tube output stage, loudspeaker, which is characterized in that non-overlapping control circuit and power tube output stage it
Between be additionally provided with pre-driver circuit, the two-way output of a non-overlapping control circuit respectively with the input terminal INP of PREP circuits
It is matched one by one with the input terminal INN of PREN circuits, the output end OTN of output end OTP and the PREN circuit of the PREP circuits connects
It connects and is connect respectively with power tube output stage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820171045.9U CN207869069U (en) | 2018-01-31 | 2018-01-31 | A kind of CLASSD audio frequency power amplifiers pre-driver circuit and audio frequency power amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820171045.9U CN207869069U (en) | 2018-01-31 | 2018-01-31 | A kind of CLASSD audio frequency power amplifiers pre-driver circuit and audio frequency power amplifier |
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| CN207869069U true CN207869069U (en) | 2018-09-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110267162A (en) * | 2019-06-18 | 2019-09-20 | 福州大学 | Audio digital to analog converter based on System Generator |
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2018
- 2018-01-31 CN CN201820171045.9U patent/CN207869069U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110267162A (en) * | 2019-06-18 | 2019-09-20 | 福州大学 | Audio digital to analog converter based on System Generator |
| CN110267162B (en) * | 2019-06-18 | 2021-06-29 | 福州大学 | Audio digital-to-analog converter based on System Generator |
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| GR01 | Patent grant | ||
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Granted publication date: 20180914 Termination date: 20190131 |