CN103929137B - A kind of circuit and its power regulating method for continuously adjusting D class power amplifier power - Google Patents
A kind of circuit and its power regulating method for continuously adjusting D class power amplifier power Download PDFInfo
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Abstract
The present invention relates to electronic technology field, discloses a kind of circuit and its power regulating method for continuously adjusting D class power amplifier power, and the circuit includes：Amplitude limiter circuit and D class power amplification circuits, the D classes power amplification circuit include integrator sub-circuit；The amplitude limiter circuit is attempted by between integrator sub-circuit input and output, and closure feedback loop is formed with integrator sub-circuit；Input using the output of the integrator sub-circuit as the amplitude limiter circuit, when the output voltage amplitude of the integrator sub-circuit is less than default limitation voltage, the amplitude limiter circuit is closed；When the output voltage amplitude of the integrator sub-circuit is equal to or more than the default limitation voltage, the amplitude limiter circuit is opened.The circuit intelligent, can input audio signal voltage it is smaller, it is not necessary to power limit when, close the electric current of each transistor in the amplitude limiter circuit automatically, reduce the power consumption of amplitude limiter circuit, simplify circuit structure.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of circuit and its power for continuously adjusting D class power amplifier power
Adjusting method.
Background technology
With the raising that people are required sound technique, a series of high-power audio power amplifiers also produce in succession.Work(
Rate amplifier abbreviation power amplifier, people are also paid special attention to when using power amplifier to the security of power amplifier, one of to require to be exactly to keep away
Exempt to burn the loudspeaker in power amplifier under emergency situations.
As shown in figure 1, it is in power amplifier that prior art, which is avoided the scheme that the loudspeaker in D class power amplifiers burns under emergency situations,
Middle design power limiting circuit, the power limit circuit reach the purpose of power limit by way of adjusting input voltage.
The power limit circuit includes amplitude limiter circuit and D class power amplification circuits, before amplitude limiter circuit is located at whole power limit circuit
End, D classes power amplification circuit are located at the rear end of whole power limit circuit, and amplitude limiter circuit is connected with D class power amplification circuits.
In use, using pressure limiting circuit in prime amplifier, pressure limiting circuit is the amplitude limiter circuit shown in Fig. 1, when the width of input signal
When degree exceedes the preset limit voltage of pressure limiting circuit, prime output signal peak value produces slicing, and this waveform passes through D class power amplifications
After power amplifier in circuit, a confined amplified signal of voltage amplitude is produced, those skilled in the art can see
Go out power amplifier output voltage to be limited inBetween.
In order to be limited prime signal voltage amplitude, it is necessary to be all restricted to ceiling voltage and minimum voltage, wherein,
MN1 and MN2 is low level clamper tube, and MP1 and MP2 are high level clamper tube, and OP1 is the amplifier of limitation low-voltage, and OP1 is specific
Circuit structure is as shown in Fig. 2 OP2 is the high-tension amplifier of limitation, and the specific circuit structures of OP2 are as shown in figure 3, work as input signal
When amplitude is less than VDD/2-Vs, OP1 output high level, pass through clamper tube MN1（Or MN2）Input signal is limited in VDD/2-
Vs;When input signal amplitude is higher than VDD/2+Vs, OP2 output low levels, pass through clamper tube MP1（Or MP2）By input signal
It is limited in VDD/2+Vs；When input signal amplitude is between VDD/2-Vs and VDD/2+Vs, OP1 output low levels, OP2 outputs
Low level, MP1, MP2, MN1, MN2 are in off state.In OP1, P1, P2 and P7 are mirror current source, P3~P6, N1
~N4 forms folded cascode Op Amp, and VB1, VB2 are bias supply, and P8 is level shift pipe, offsets MN1（Or MN2）'s
Threshold voltage.In OP2, N5, N6 and N11 are mirror current source, and N7~N10, P9~P12 form Foldable cascade fortune
Put, VB3, VB4 are bias supply, and N12 is level shift pipe, offset MP1（Or MP2）Threshold voltage.
In summary, because power limit circuit of the prior art limits using to prime signal voltage amplitude
System, it is therefore desirable to be all restricted to ceiling voltage and minimum voltage, circuit realiration is complicated.When input audio signal voltage compared with
It is small, it is not necessary to when power limits, amplitude limiter circuit stills need work, it is necessary to consume power, therefore, power limit of the prior art
Circuit processed is not intelligent.
The content of the invention
, should it is an object of the invention to provide a kind of circuit and its power regulating method for continuously adjusting D class power amplifier power
Circuit intelligent, can input audio signal voltage amplitude it is smaller, it is not necessary to power limit when, close the limit automatically
The electric current of each transistor in width circuit, reduces the power consumption of amplitude limiter circuit, simplifies circuit structure.
In order to solve the above technical problems, embodiments of the present invention provide a kind of electricity for continuously adjusting D class power amplifier power
Road, including amplitude limiter circuit and D class power amplification circuits, including：
The D classes power amplification circuit includes integrator sub-circuit；The amplitude limiter circuit is attempted by the integrator electricity
Between the input and output on road；Input using the output of the integrator sub-circuit as the amplitude limiter circuit, when the integration
When the output voltage amplitude of device sub-circuit is less than default limitation voltage, the amplitude limiter circuit is closed；When integrator electricity
When the output voltage amplitude on road is equal to or more than the default limitation voltage, the amplitude limiter circuit is opened.
Embodiments of the present invention additionally provide a kind of power to the above-mentioned circuit for continuously adjusting D class power amplifier power and adjusted
Section method, is comprised the steps of：
By the control source of integrator sub-circuit output into the amplitude limiter circuit；
If the voltage magnitude of the integrator sub-circuit output is less than default limitation voltage, the amplitude limit electricity is closed
Road；
If the voltage magnitude of the integrator sub-circuit output is equal to or more than the default limitation voltage, open
The amplitude limiter circuit.
Embodiment of the present invention is in terms of existing technologies, there is provided the circuit for continuously adjusting D class power amplifier power compare
Intelligence, amplitude limiter circuit is placed in the inside of D class power amplifiers, will the amplitude limiter circuit be attempted by the input of integrator sub-circuit and output
Between, the input using the output of integrator sub-circuit as the amplitude limiter circuit, during specific works, if integrator sub-circuit is defeated
Go out voltage magnitude and be equal to or more than default limitation voltage, the transistor turns in amplitude limiter circuit, that is, start amplitude limiter circuit；If product
The output voltage amplitude of point device sub-circuit is less than default limitation voltage, and the transistor in amplitude limiter circuit turns off, that is, disconnects amplitude limit
Circuit；Therefore, the circuit can input audio signal voltage it is smaller, it is not necessary to power limit when, automatically shut down the limit
The electric current of each transistor in width circuit, so as to reduce the power consumption of amplitude limiter circuit.
Preferably, the trsanscondutance amplifier sub-circuit includes p channel transistor P1~P8 and N-channel transistor N1~N6；
The electric current mirror circuit includes p channel transistor P9, P10 and N-channel transistor N7~N9；The limiter transistor is N10；
Wherein, the P1, the P2, the P3, the P4, the P5, the P6, the P7, the P8, the P9 and
The source electrode of the P10 is all connected with supply voltage VDD；The grid of the P1, the draining of the P5, the grid of the P6 and drain electrode,
Drain electrode of the grid of the P7 with the N4 is connected；The grid of the N1, the grid of the N2 and drain electrode are with the P2's
Drain electrode is connected；The grid of the grid of the P2, the grid of the P3 and drain electrode, the drain electrode of the P4 and the P8 with the N3
Drain electrode be connected；The drain electrode phase of the P4, the P5, the grid of the P9, the grid and drain electrode of the P10 with the N8
Even；The drain electrode of the grid of the N5 and drain electrode, the grid of the N6 with the P7 is connected；The N3 and the N4 grid,
The drain electrode of the drain electrode of the N10 and grid with the P9 is connected；The N7, the N8 and the N9 grid link together
It is connected afterwards with current source；
The N1, the N2, the N5, the N6, the N7, the N8 and the N9 source grounding；The N3
First input end and the second input with the source electrode of the N4 respectively as the amplitude limiter circuit；The P8 and N6 leakage
Pole is connected together as the first output end of the amplitude limiter circuit；The drain electrode and the drain electrode of the N1 of the P1 links together
The second output end as the amplitude limiter circuit；The drain electrode of the N7 and the source electrode of the N10 are all connected with limiting voltage Vs.
Input using the output of integrator sub-circuit as amplitude limiter circuit, that is, the voltage that integrator sub-circuit is exported
N3 source electrode or N4 source electrode are input to, when the output voltage amplitude of integrator sub-circuit is less than default limitation voltage, electricity
Pressure amplitude degree is unable to reach the required amplitude of N3 and N4 conductings, and therefore, N3 and N4 are in off state, now, in N3 and N4
Portion does not have electric current by so, because other electronic devices are serially connected with N3 or N4 in whole amplitude limiter circuit
, so, it is also what no electric current passed through in other electronic devices in whole amplitude limiter circuit, thus, it can be understood that entirely
Amplitude limiter circuit is off-state, be do not have it is in harness, trsanscondutance amplifier output current be 0, amplitude limiter circuit does not interfere with work(
The normal output put；When the output voltage amplitude of integrator sub-circuit is equal to or more than default limitation voltage, voltage amplitude
Reach the required amplitude of N3 or N4 conductings, therefore, N3 or N4 can lead in the once for every half lubrication groove conductance of audio signal, this
When, have inside N3 and N4 electric current in turn by, so, due in whole amplitude limiter circuit other electronic devices be all with N3 or
What N4 was serially connected, so, in other electronic devices in whole amplitude limiter circuit, the crystal of current mirror is formed with N3 or N4
Pipe is also to have what electric current passed through in turn, thus, it can be understood that whole amplitude limiter circuit is in running order.Put by mutual conductance
Output sourcing current after big device shunts to integrator sub-circuit so that and the amplitude of integrator sub-circuit output voltage is restricted,
Pass through PWM circuit, rear class gate driver and the switching power tube of D class power amplification circuits rear end again, after low-pass filtered,
The restricted voltage signal of output amplitude, plays a part of power limit.When input signal is weak, the amplitude limiter circuit in the present invention
Work is not involved in, hardly consumes unnecessary power.The present invention realizes the purpose of continuous power regulation simultaneously, achieves more preferably
Auditory effect, the perception of client can be improved.
Brief description of the drawings
Fig. 1 is the power limit circuit figure of D classes power amplifier in the prior art；
Fig. 2 is the particular circuit configurations figure of OP1 in D classes power amplifier in the prior art；
Fig. 3 is the particular circuit configurations figure of OP2 in D classes power amplifier in the prior art；
Fig. 4 is the circuit theory schematic diagram for continuously adjusting D class power amplifier power in first embodiment of the invention；
Fig. 5 is the circuit diagram for continuously adjusting D class power amplifier power in second embodiment of the invention；
Fig. 6 is the circuit diagram of amplitude limiter circuit in the circuit for continuously adjusted in second embodiment of the invention D class power amplifier power；
Fig. 7 is a kind of defeated of amplitude limiter circuit in the circuit for continuously adjusted in second embodiment of the invention D class power amplifier power
Enter the oscillogram of signal；
Fig. 8 is a kind of defeated of amplitude limiter circuit in the circuit for continuously adjusted in second embodiment of the invention D class power amplifier power
Enter the oscillogram of signal；
Fig. 9 is to continuously adjusting described in first embodiment and second embodiment in third embodiment of the invention
The adjusting method schematic flow sheet of the power of the circuit of D class power amplifier power.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, each reality below in conjunction with accompanying drawing to the present invention
The mode of applying is explained in detail.However, it will be understood by those skilled in the art that in each embodiment of the present invention,
In order that reader more fully understands the application and proposes many ins and outs.But even if without these ins and outs and base
Many variations and modification in following embodiment, each claim of the application technical side claimed can also be realized
Case.
First embodiment of the invention provides a kind of circuit for continuously adjusting D class power amplifier power, as shown in figure 4, this is continuous
The circuit of regulation D class power amplifier power includes amplitude limiter circuit and D class power amplification circuits.Integrator sub-circuit and regulation sub-circuit group
Into D class power amplification circuits, wherein, regulation sub-circuit includes PWM（Pulse Width Modulation, pulse width modulation）
Modulation circuit, gate driver（Gate Driver）And switching power tube；Integrator sub-circuit is used to miss input signal and output
Difference carries out integral operation, comparator and triangular-wave generator composition PWM circuit, for by integrator sub-circuit output signal
Compared with triangle wave voltage, pwm signal is produced；Gate driver is used for driving switch power tube.Amplitude limiter circuit is attempted by product
Divide between device sub-circuit and input and output, for limiting the output voltage amplitude of integrator sub-circuit.
In specific works, using the input exported as amplitude limiter circuit of integrator sub-circuit, integrator sub-circuit and limit
Width circuit forms feedback loop, when the output voltage amplitude of integrator sub-circuit is less than default limitation voltage, amplitude limit electricity
Transistor shut-off in road, that is, be disconnected amplitude limiter circuit；When the output voltage amplitude of integrator sub-circuit is equal to or more than preset
Limitation voltage when, the transistor turns in amplitude limiter circuit, that is, open amplitude limiter circuit.
Embodiment of the present invention is in terms of existing technologies, there is provided the circuit for continuously adjusting D class power amplifier power compare
Intelligence, amplitude limiter circuit is attempted by between the input of integrator sub-circuit and output, using the output of integrator sub-circuit as the limit
The input of width circuit, during specific works, if the output voltage amplitude of integrator sub-circuit is equal to or more than default limitation voltage,
Transistor turns in amplitude limiter circuit, that is, start amplitude limiter circuit；If the output voltage amplitude of integrator sub-circuit is less than default
Voltage is limited, the transistor turns in amplitude limiter circuit, that is, disconnects amplitude limiter circuit；Therefore, the circuit can be believed in the audio of input
Number voltage is smaller, it is not necessary to when power limits, the amplitude limiter circuit in the circuit is disconnected, so as to reduce the power of amplitude limiter circuit
Consumption.
Second embodiment of the invention provides a kind of concrete structure diagram for the circuit for continuously adjusting D class power amplifier power, such as Fig. 5
Shown, the circuit for continuously adjusting D class power amplifier power is made up of amplitude limiter circuit and D class power amplification circuits, wherein, amplitude limiter circuit
For the part in dotted line frame in Fig. 5, except the part composition D class power amplification circuits of amplitude limiter circuit, the D class power amplifications in Fig. 5
Circuit is same as the prior art.
Specifically, as shown in Figure 5, the D classes power amplification circuit includes integrator sub-circuit and regulation sub-circuit；Regulator
Circuit includes PWM circuit, gate driver and switching power tube M1~M4, and integrator sub-circuit includes：Electric capacity C1~C6, electricity
Hinder R11, R12, R13, R21, R22 and R23, integrator A1 and A2；The integrator sub-circuit is second-order integrator, with amplitude limiter circuit
Form the feedback loop of closure.PWM circuit includes triangular-wave generator, comparator B1 and B2.
Wherein, R11 and R21 first end connects positive input voltage and reverse input voltage respectively；Positive input voltage
Can be positive voltage, Ke Yiyong（IN+）To represent, reverse input voltage can be negative voltage, Ke Yiyong（IN-）To represent.C1、
C2 and C3 orders are connected, and C4, C5 and C6 order are connected, R11 the second end simultaneously with C1 positive pole, A1 in-phase input end and
R12 first end is connected, and C1 positive pole is connected with the first output end of amplitude limiter circuit；R21 the second end simultaneously the positive pole with C4,
A1 inverting input and R22 first end are connected, and C4 positive pole is connected with the second output end of amplitude limiter circuit；A1's is anti-phase defeated
Go out end simultaneously with the positive pole of C1 negative pole, R13 first end and C2 to be connected, A1 in-phase output end while negative pole, R23 with C4
First end be connected with C5 positive pole, R13 the second end positive pole phase with C2 negative pole, A2 in-phase input end and C3 simultaneously
Even, R23 the second end is connected with the positive pole of C5 negative pole, A2 inverting input and C6 simultaneously；C3 negative pole, A2 it is anti-phase defeated
Go out end simultaneously with B1 in-phase input end and the first input end of amplitude limiter circuit to be connected；C6 negative pole, A2 in-phase output end are same
When be connected with B2 in-phase input end and the second input of amplitude limiter circuit；B1 inverting input and B2 inverting input are equal
It is connected with triangular-wave generator TRIP；B1 and B2 output end uses as the input of gate driver, and M1 and M2 grid are equal
Connect the output end of gate driver；M3 and M4 grid is all connected with the output end of gate driver；M1 and M2 drain electrode and the of R12
The reversed-phase output of two end phase downlink connection D class power amplification circuits, the reversed-phase output of the D class power amplification circuits can be used
VOUT- represent, M3 and M4 drain electrode and the in-phase output end of the R22 second end phase downlink connection D class power amplification circuits, the D classes
The in-phase output end of power amplification circuit can be usedTo represent；M1 connects supply voltage power power-supply with M4 source electrode
PVDD；M2 and M3 source grounding.Wherein, M1 and M4 is p channel transistor, and M2 and M3 are N-channel transistor.
As shown in fig. 6, amplitude limiter circuit includes trsanscondutance amplifier sub-circuit, electric current mirror circuit and limiter transistor, mutual conductance
Amplifier sub-circuit is connected in parallel with electric current mirror circuit, and limiter transistor is serially connected in electric current mirror circuit.Trsanscondutance amplifier
Sub-circuit includes p channel transistor P1~P8 and N-channel transistor N1~N6；Electric current mirror circuit include p channel transistor P9,
P10 and N-channel transistor N7~N9；Electric current mirror circuit can provide bias current for trsanscondutance amplifier sub-circuit, and amplitude limit is brilliant
Body pipe is N10；N3, N4 and N10 mirror image, form source follower.Wherein, P1, P2, P3, P4, P5, P6, P7, P8, P9 and
P10 source electrode is all connected with supply voltage VDD；N7, N8 and N9 grid are connected after linking together with current source；P1 grid,
P6 drain electrode is connected with N4 drain electrode；N1 grid, N2 grid and drain electrode are connected with P2 drain electrode；P2 and P3 grid is equal
It is connected with P4 drain electrode；P3 drain electrode and P8 grid are connected with N3 drain electrode；P4, P5, P9 grid, P10 grid and
Drain electrode is connected with N8 drain electrode；P6 and P7 grid is connected with P5 drain electrode；N5 grid and drain electrode, N6 grid and P7
Drain electrode be connected；The drain electrode of N3 and N4 grid, N10 and grid are connected with P9 drain electrode；N1, N2, N5, N6, N7, N8 and N9
Source grounding；N3 and N4 source electrode is respectively as the first input end and the second input of amplitude limiter circuit, first input end
It can be represented respectively with V1 and V2 with the second input；It is first defeated to be connected together as amplitude limiter circuit for P8 and N6 drain electrode
Go out end, the first output end can be represented with V01；P1 drain electrode and N1 drain electrode is connected together as the second of amplitude limiter circuit
Output end, the first output end can be represented with V02；N7 and N8 grid is connected with N9 grid；N7 drain electrode is with N10's
Source electrode is all connected with limiting voltage Vs.It is by the mirroring ratios of N1 and N2 electric current and equal by the mirroring ratios of N5 and N6 electric current
For K:1, K is the number not equal to 0.It is by the mirroring ratios of P2 and P3 electric current and by the mirroring ratios of P6 and P7 electric current
1:1.The open-loop gain for the feedback loop that can be so formed by adjusting the big minor adjustment amplitude limiter circuit of K values.
During specific works, the first input end using R11 first end as integrator sub-circuit, R21 input is made
For the second input of integrator sub-circuit, the input signal of the first input end of integrator sub-circuit inputs the same of A1 through R11
Phase input, the signal of A1 reversed-phase output output input A2 in-phase input end through R13 all the way, and another way is fed back to through C1
A1 in-phase input end, the signal of A2 inverting input output enter the first input end of amplitude limiter circuit, another way warp all the way
C3 feeds back to A2 in-phase input end；Similarly,
The input signal of second input of integrator sub-circuit inputs A1 inverting input through R21, and A1's is same mutually defeated
The signal for going out end output inputs A2 inverting input through R23 all the way, and another way feeds back to A1 inverting input through C4, A2's
The signal of in-phase input end output enters the second input of amplitude limiter circuit all the way, and another way feeds back to A2 anti-phase input through C6
End.
When amplitude limiter circuit is connected into integrator sub-circuit and gate driver sub-circuit, specific connection method is：Limit
The first input end of width circuit is connected with C3 negative pole and A2 reversed-phase output simultaneously, wherein, the first input of amplitude limiter circuit
End can be N3 source electrode；Second input of amplitude limiter circuit is connected with C6 negative pole and A2 in-phase output end, amplitude limiter circuit
The second input can be N4 source electrode；First output end of amplitude limiter circuit is connected with C1 positive pole；The second of amplitude limiter circuit
Output end is connected with C4 positive pole.
Circuit in following compares figure 5 and Fig. 6 carries out letter to the course of work of the circuit for continuously adjusting D class power amplifier power
Single description.Because integrator A2 differential output signal is full symmetric signal, therefore amplitude limiter circuit is only needed to signal
Upper half cycle or lower half time limit system, control mode are more succinct.By taking the lower half time limit width to signal as an example, work as integration
Device A2 output voltage amplitude is when limiting within voltage, the input of A2 output voltage as transistor N3 or N4, Wu Fada
The magnitude of voltage required to N3 or N4 conductings, therefore, N3 or N4 are off state, and accordingly, other in amplitude limiter circuit are brilliant
Body pipe is also at off state, that is to say, that amplitude limiter circuit is off, and the circuit for continuously adjusting D class power amplifier power is defeated
Go out distortionless amplified signal；When the output voltage amplitude of integrator sub-circuit is more than or equal to default limitation voltage, A2
Input of the output voltage as transistor N3 or N4, the required magnitude of voltage of N3 or N4 conductings, therefore, N3 or N4 can be met
In the conduction state, accordingly, other transistors in amplitude limiter circuit can also be switched on, that is to say, that amplitude limiter circuit is opened
Dynamic, in the presence of loop negative-feedback, the output voltage of integrator sub-circuit is limited in setting voltage.
If the PWM circuit modulated signal TRIP of D class power amplifiers triangle crest value is Vt, power power-supply PVDD power supply
Voltage is Vp, then the voltage gain from integrator output terminal to the circuit output end for the power power for continuously adjusting D class power amplifiers is A
=Vp/Vt, when the default limitation voltage of amplitude limiter circuit is VSWhen, those skilled in the art can extrapolate the defeated of power amplifier
It is (VDD/2-V to go out ceiling voltage amplitudeS)×Vp/ Vt, corresponding input audio signal amplitude areThe input audio signal amplitude is the voltage amplitude of input audio signal, when input audio letter
When number being less than this amplitude, amplitude limiter circuit does not work, and when input audio signal is more than or equal to this amplitude, amplitude limiter circuit will open
It is dynamic.Reasonable adjusting VSValue, it is possible to control output voltage amplitude (VDD/2-VS)×Vp/VtValue, so also can by work(
Rate amplifier is limited in different power outputs.In addition, VSValue can continuously be adjusted, that is to say, that company can be passed through
Continuous regulation VSMagnitude of voltage, the power of the circuit of the D class power amplifier power can be continuously adjusted.
In the structure of the amplitude limiter circuit shown in Fig. 6, P1~P8 and N1~N6 form trsanscondutance amplifier, P9~P10 with
And N7~N9 composition current mirrors, provide bias current, Vs termination setting limitation voltages, N3, N4 and N10 mirror for trsanscondutance amplifier
Picture, source follower is formed, those skilled in the art can be seen that in the presence of feedback loop, V1 and V2 source
Pole tension is limited in Vs+VgsN10-VgsN3 ≈ Vs.Wherein, VgsN10 represents voltage added between N10 source electrode and grid
Maximum, the maximum of added voltage between VgsN3 expressions N10 source electrode and grid.Because V1 and V2 signals are that integrator is poor
Divide output signal, therefore, work as VS<During VDD/2, N3 pipes and N4 pipes can only turn in turn within every half of audio signal cycle, existing
The course of work of the trsanscondutance amplifier sub-circuit is analyzed in two kinds of situation：
1st, assume that default limitation voltage is VS, preset when the input voltage amplitude of input trsanscondutance amplifier sub-circuit is less than
Limitation voltage when, i.e., V1 magnitude of voltage is more than VSWhen,（That is V1>VSOr V2>VS）, V1 voltage magnitude is less than VS, such as Fig. 7 institutes
Show, corresponding input audio signal amplitude is less thanInside without electric current by, therefore, P1~
P8, N1~N6 pipes are without electric current by the way that trsanscondutance amplifier output current is 0, and amplitude limiter circuit does not interfere with the normal of power amplifier
Output.
2nd, when the input voltage amplitude for inputting trsanscondutance amplifier sub-circuit is more than default limitation voltage（That is V1<VSOr
V2<VS）, as shown in figure 8, corresponding input audio signal amplitude is more thanNow N3 pipes or N4
Pipe leads in every half of audio signal cycle lubrication groove conductance, example, and N3 is turned in the upper half cycle, and N4 is turned in the lower half cycle.This
The technical staff in field can extrapolate N3 pipes（Or N4 pipes）In the electric current that passes through be IN3,N4=gmN3,N4×(VS-V1), wherein,
gmN3,N4Represent N3 pipes（Or N4 pipes）Mutual conductance, therefore, P1~P8, N1~N3 or P5~P8, N4~N6 pipes have electric current wheel circulation
Cross, pass through VO2 after trsanscondutance amplifier（Or VO1）Output current be IO2=gmN3,N4×(VS-V1)×K（K is current mirror image ratio
Example）, the electric current is to integrator shunting so that the amplitude of integrator sub-circuit output voltage is limited in more than Vs, then is adjusted by PWM
Circuit, rear class gate driver and switching power tube M1~M4 processed, the restricted voltage signal of output amplitude after LPF,
Play a part of power limit.
Input using the output of integrator sub-circuit as amplitude limiter circuit, that is, the voltage that integrator sub-circuit is exported
N3 source electrode or N4 source electrode are input to, when the output voltage amplitude of integrator sub-circuit is less than default limitation voltage, electricity
Pressure amplitude degree is unable to reach the required amplitude of N3 and N4 conductings, and therefore, N3 and N4 are in off state, now, in N3 and N4
Portion does not have electric current by so, because other electronic devices are serially connected with N3 or N4 in whole amplitude limiter circuit
, so, it is also what no electric current passed through in other electronic devices in whole amplitude limiter circuit, thus, it can be understood that entirely
Amplitude limiter circuit is off-state, be do not have it is in harness, trsanscondutance amplifier output current be 0, amplitude limiter circuit does not interfere with work(
The normal output put；When the output voltage amplitude of integrator sub-circuit is equal to or more than default limitation voltage, voltage amplitude
The required amplitude of N3 or N4 conductings is reached, therefore, N3 or N4 can take turns conductance in the once for every half of input audio signal
It is logical, now, there is electric current in turn by so, because other electronic devices are all in whole amplitude limiter circuit inside N3 or N4
It is serially connected with N3 or N4, so, in other electronic devices in whole amplitude limiter circuit, current mirror is formed with N3 or N4
Transistor in and have what electric current passed through in turn, thus, it can be understood that whole amplitude limiter circuit is in running order.It is logical
The output sourcing current crossed after trsanscondutance amplifier to integrator sub-circuit shunt so that the amplitude of integrator sub-circuit output voltage by
To limitation, then by PWM circuit, rear class gate driver and switching power tube, after LPF, output amplitude is limited
The voltage signal of system, plays a part of power limit.When input signal is weak, the amplitude limiter circuit in the present invention is not involved in work,
Hardly consume unnecessary power.The present invention realizes the purpose of continuous power regulation simultaneously, achieves more preferably auditory effect,
The perception of client can be improved.
It is seen that present embodiment is the system embodiment corresponding with first embodiment, present embodiment can be with
First embodiment is worked in coordination implementation.The relevant technical details mentioned in first embodiment still have in the present embodiment
Effect, in order to reduce repetition, is repeated no more here.Correspondingly, the relevant technical details mentioned in present embodiment are also applicable in
In first embodiment.
Third embodiment of the present invention provides a kind of power regulating method, this method be used to adjusting first embodiment and
The circuit for continuously adjusting D class power amplifier power described in second embodiment, as shown in figure 9, the method includes the steps of：
901st, the control source for exporting integrator sub-circuit is into amplitude limiter circuit.
902nd, whether the voltage magnitude of decision integrator sub-circuit output is less than default limitation voltage.
If the voltage magnitude of integrator sub-circuit output is less than default limitation voltage, step 903 is performed；If integration
The voltage magnitude of device output is equal to or more than default limitation voltage, performs step 904.
903rd, amplitude limiter circuit is closed.
904th, amplitude limiter circuit is opened.
Further, after by the control source that integrator sub-circuit exports to the step in amplitude limiter circuit, in amplitude limit
Following steps are performed in circuit：
Level shift is carried out to default limitation voltage using limiter transistor；Using trsanscondutance amplifier sub-circuit by amplitude limit
Voltage difference between the input voltage of circuit and default limitation voltage is converted to electric current, and the input of prime integrator is divided
Stream；Using electric current mirror circuit be limited width circuit provide bias current.
The specific attachment structure and operation principle of each circuit and sub-circuit may be referred to the first embodiment party in present embodiment
Associated description in formula and second embodiment, therefore not to repeat here.
Embodiment of the present invention in terms of existing technologies, using integrator sub-circuit output as the defeated of amplitude limiter circuit
Enter, during specific works, when the output voltage amplitude of integrator sub-circuit is equal to or more than default limitation voltage, start amplitude limit
Circuit；When the output voltage amplitude of integrator sub-circuit is less than default limitation voltage, amplitude limiter circuit is disconnected；Therefore, the electricity
Road can input audio signal voltage it is smaller, it is not necessary to power limit when, turn off each transistor in the amplitude limiter circuit
Electric current, so as to reduce the power consumption of amplitude limiter circuit.
It will be understood by those skilled in the art that the respective embodiments described above are to realize the specific embodiment of the present invention,
And in actual applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (5)
1. a kind of circuit for continuously adjusting D class power amplifier power, including amplitude limiter circuit and D class power amplification circuits, it is characterised in that
The D classes power amplification circuit includes integrator sub-circuit；The amplitude limiter circuit is attempted by the integrator sub-circuit
Between input and output；Input using the output of the integrator sub-circuit as the amplitude limiter circuit, when integrator
When the output voltage amplitude of circuit is less than default limitation voltage, the amplitude limiter circuit is closed；When the integrator sub-circuit
When output voltage amplitude is equal to or more than the default limitation voltage, the amplitude limiter circuit is opened；
Wherein, the amplitude limiter circuit includes trsanscondutance amplifier sub-circuit, electric current mirror circuit and limiter transistor, and the mutual conductance is put
Big device sub-circuit is used to the difference for inputting the voltage and the default limitation voltage of the amplitude limiter circuit being converted to current value,
And the input to the integrator sub-circuit shunts；It is the trsanscondutance amplifier sub-circuit that the electric current mirror circuit, which is used for,
Bias current is provided, the limiter transistor is used to carry out level shift to the default limitation voltage.
2. the circuit according to claim 1 for continuously adjusting D class power amplifier power, it is characterised in that the trsanscondutance amplifier
Sub-circuit includes p channel transistor P1~P8 and N-channel transistor N1~N6；The electric current mirror circuit includes P-channel crystal
Pipe P9, P10 and N-channel transistor N7~N9；The limiter transistor is N10；
Wherein, the P1, the P2, the P3, the P4, the P5, the P6, the P7, the P8, the P9 and described
P10 source electrode is all connected with supply voltage VDD；It is the grid of the P1, the draining of the P5, the grid of the P6 and drain electrode, described
Drain electrode of the P7 grid with the N4 is connected；The drain electrode of the grid of the N1, the grid and drain electrode of the N2 with the P2
It is connected；Leakage of the grid of the grid of the P2, the grid of the P3 and drain electrode, the drain electrode of the P4 and the P8 with the N3
Extremely it is connected；The drain electrode of the P4, the P5, the grid of the P9, the grid and drain electrode of the P10 with the N8 is connected；Institute
The drain electrode of N5 grid and drain electrode, the grid of the N6 with the P7 is stated to be connected；It is the N3 and the N4 grid, described
The drain electrode of N10 drain electrode and grid with the P9 is connected；The N7, the N8 and the N9 grid link together after with
Current source is connected；
The N1, the N2, the N5, the N6, the N7, the N8 and the N9 source grounding；The N3 and institute
State N4 first input end and second input of the source electrode respectively as the amplitude limiter circuit；The P8 and N6 drain electrode connects
The first output end being connected together as the amplitude limiter circuit；The drain electrode and the drain electrode of the N1 of the P1 is connected together as
Second output end of the amplitude limiter circuit；The drain electrode of the N7 and the source electrode of the N10 are all connected with limiting voltage Vs.
3. the circuit according to claim 2 for continuously adjusting D class power amplifier power, it is characterised in that pass through the P2 and institute
State P3 electric current mirroring ratios and by the mirroring ratios of the P6 and the electric current of the P7 be 1:1.
4. the circuit according to claim 2 for continuously adjusting D class power amplifier power, it is characterised in that the D classes power amplification
Circuit also includes regulation sub-circuit；
The integrator sub-circuit includes：Electric capacity C1~C6, resistance R11, R12, R13, R21, R22 and R23, operational amplifier A 1
And A2；The regulation sub-circuit includes triangular-wave generator TRIP, comparator B1 and B2；Gate driver and switching power tube M1~
M4；
Wherein, the R11 and the R21 first end connect positive input voltage and reverse input voltage respectively；The C1, institute
C2 and C3 orders are stated to be connected, the C4, the C5 and C6 orders are connected, the second end of the R11 simultaneously with it is described
The first end of C1 positive pole, the in-phase input end of the A1 and the R12 is connected, the positive pole of the C1 and the amplitude limiter circuit
First output end is connected；The second end of the R21 simultaneously with the positive pole of the C4, the inverting input of the A1 and the R22
First end be connected, the positive pole of the C4 is connected with the second output end of the amplitude limiter circuit；The reversed-phase output of the A1 is same
When be connected with the positive pole of the negative pole of the C1, the first end of the R13 and the C2, the in-phase output end of the A1 simultaneously with institute
State C4 negative pole, the first end of the R23 is connected with the positive pole of the C5, the second end of the R13 is simultaneously negative with the C2
Pole, the in-phase input end of the A2 are connected with the positive pole of the C3, the second end of the R23 while the negative pole with the C5, institute
The inverting input for stating A2 is connected with the positive pole of the C6；The negative pole of the C3, the A2 reversed-phase output simultaneously with it is described
B1 in-phase input end and the first input end of the amplitude limiter circuit are connected；The in-phase output end of the negative pole of the C6, the A2
It is connected simultaneously with the in-phase input end of the B2 and the second input of the amplitude limiter circuit；The inverting input of the B1 and institute
The inverting input for stating B2 is connected with the TRIP；Input of the B1 and the B2 output end as the gate driver
End uses, and the switching power tube M1 and the M2 grid are all connected with the output end of the gate driver；The switch power
Pipe M3 and the M4 grid are all connected with the output end of the gate driver；The M1 and M2 drain electrode is with the R12's
The reversed-phase output of D class power amplification circuits described in second end phase downlink connection, the M3 and M4 drain electrode is with the R22's
The in-phase output end of D class power amplification circuits described in second end phase downlink connection；The M1 connects power electricity with the source electrode of the M4
Source PVDD；The M2 and the M3 source grounding.
5. a kind of power regulating method of the circuit as claimed in claim 1 for continuously adjusting D class power amplifier power, its feature exist
In comprising the steps of：
By the control source of integrator sub-circuit output into the amplitude limiter circuit；
Level shift is carried out to the default limitation voltage of the amplitude limiter circuit using limiter transistor；
Using trsanscondutance amplifier sub-circuit by the integrator sub-circuit output voltage with it is described it is default limitation voltage voltage
Difference is converted to electric current, and the input to the integrator sub-circuit shunts；
Using electric current mirror circuit bias current is provided for the amplitude limiter circuit；
If the voltage magnitude of the integrator sub-circuit output is less than default limitation voltage, the amplitude limiter circuit is closed；
If the voltage magnitude of integrator sub-circuit output is equal to or more than the default limitation voltage, described in unlatching
Amplitude limiter circuit.
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| CN104779921B (en) * | 2015-02-11 | 2019-02-19 | 矽力杰半导体技术(杭州)有限公司 | A kind of class-D amplifier and its control method |
| CN112994631A (en) * | 2019-12-02 | 2021-06-18 | 华润微集成电路(无锡)有限公司 | Circuit structure for adaptive half-wave modulation control of class-D power amplifier |
| CN111901725B (en) * | 2020-07-22 | 2022-02-01 | 上海艾为电子技术股份有限公司 | Audio power amplifier circuit and power limiting method thereof |
| CN113783534B (en) * | 2021-09-15 | 2022-05-17 | 武汉市聚芯微电子有限责任公司 | Feedback type audio power amplifying circuit, audio amplifying device and electronic device |
| CN113541480A (en) * | 2021-09-15 | 2021-10-22 | 武汉市聚芯微电子有限责任公司 | Voltage-stabilizing power regulating circuit, power regulating device and electronic device |
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| CN102549919A (en) * | 2009-08-19 | 2012-07-04 | 高通股份有限公司 | Protection circuit for power amplifier |
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| JP3922182B2 (en) * | 2002-12-27 | 2007-05-30 | ヤマハ株式会社 | Amplifier circuit |
| CN1525639A (en) * | 2003-02-26 | 2004-09-01 | 李相前 | A low distortion Class D amplifier |
| CN101453194B (en) * | 2007-11-30 | 2011-05-04 | 无锡华润矽科微电子有限公司 | Non-filter circuit construction for D type power amplifier and processing method thereof |
| JP5228840B2 (en) * | 2008-11-27 | 2013-07-03 | ヤマハ株式会社 | amplifier |
| CN203278752U (en) * | 2013-05-23 | 2013-11-06 | 四川湖山电器有限责任公司 | Dynamic amplitude limiting protector of audio power amplifier |
| CN103269206B (en) * | 2013-05-28 | 2016-08-24 | 上海贝岭股份有限公司 | A kind of output limiter circuit of amplifier |
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| CN102549919A (en) * | 2009-08-19 | 2012-07-04 | 高通股份有限公司 | Protection circuit for power amplifier |
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