CN103856170A - Power-stage power supply noise error elimination method of H-bridge type digital D type power amplifier - Google Patents

Power-stage power supply noise error elimination method of H-bridge type digital D type power amplifier Download PDF

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CN103856170A
CN103856170A CN201410100228.8A CN201410100228A CN103856170A CN 103856170 A CN103856170 A CN 103856170A CN 201410100228 A CN201410100228 A CN 201410100228A CN 103856170 A CN103856170 A CN 103856170A
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supply noise
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于泽琦
樊养余
袁永金
史龙飞
吕国云
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Guangzhou Shengkuang Electronic Technology Co., Ltd.
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Northwestern Polytechnical University
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Abstract

The invention discloses a power-stage power supply noise error elimination method of an H-bridge type digital D-type power amplifier. The method is used for solving the technical problem of circuit complexity of the existing H-bridge digital D type power amplifier. The method has the technical scheme that firstly, the power-stage power supply voltage is subjected to voltage division and amplitude reduction, analog-to-digital conversion and normalization processing, and normalized digital power supply noise signals are obtained; then, the normalized signal power supply noise signals are multiplied with output signals of an interpolation filter, and error signals are obtained; finally, the error signals are subtracted from the output signals of the interpolation filter, and corrected signals are obtained. The corrected signals contain the power-stage power supply noise error compensation, so the corrected signals are directly input into a sigma-delta modulator, and the power-stage power supply noise error of the H-bridge type digital D type power amplifier can be eliminated. The method has the advantages that under the condition of not changing the existing module internal structure of the original H-bridge type digital D type power amplifier, the elimination on the power-stage power supply noise error is realized, and the method is simple.

Description

For the power stage power supply noise error cancelling method of H bridge-type numeral D class power amplifier
Technical field
The present invention relates to a kind of power stage power supply noise error cancelling method, particularly relate to a kind of power stage power supply noise error cancelling method for H bridge-type numeral D class power amplifier.
Background technology
With reference to Fig. 1.Numeral D class power amplifier is due to its power-efficient high and be convenient to and digital audio source Interface Matching, is more and more subject to the favor of consumer electronics product.Numeral D class power amplifier is made up of interpolator, sigma-delta modulator, digital PWM (Pulse Width Modulation, pulse width modulation) generator, power stage and simulation low-pass filter conventionally.First the digital audio and video signals of numeral D class power amplifier input is converted to the digital signal of the low precision of high speed through interpolator and sigma-delta modulator, convert pwm signal to by digital PWM generator again, then power stage is amplified this pwm signal to export to simulation low-pass filter, and the radio-frequency component of the last high-power pwm signal of simulation low-pass filter filtering drives loud speaker sounding.
Because the DC power supply of power stage is made up of rectifier, simulation low-pass filter and pressurizer conventionally, the precision of power stage DC power supply is higher, the volume of its simulation low-pass filter and pressurizer is larger, so in order to save cost and to dwindle small product size, without the DC power supply of pressurizer usually for digital D class power amplifier.Due under identical supply power voltage, the power output of H bridge-type power stage is four times of monofocal power stage, so high power digital D class power amplifier uses H bridge-type power stage conventionally.Shown in H bridge-type numeral D class power amplifier structure schematic diagram accompanying drawing 1.In the time that the use of H bridge-type numeral D class power amplifier is powered for power stage without the DC power supply of pressurizer, thereby the power supply noise of power stage power supply will produce error with input signal intermodulation, makes the hydraulic performance decline of H bridge-type numeral D class power amplifier.But most H bridge-type numeral D class power amplifier is all pure open loop structure and does not contain power supply error elimination function in the market, they cannot eliminate the error that power stage power supply noise produces output signal.Minority high-performance H bridge-type numeral D class power amplifier contains feedback loop to eliminate power stage power supply noise error, in the feedback loop of these H bridge-type numerals D class power amplifier, the output signal of power stage is often input to the input of sigma-delta modulator or digital PWM generator or power stage as feedback signal, because feedback signal is high frequency, high-power signal, so the design of these H bridge-type numerals D class power amplifier is more complicated.
Summary of the invention
In order to overcome the deficiency of existing H bridge-type numeral D class power amplifier complexity, the invention provides a kind of power stage power supply noise error cancelling method for H bridge-type numeral D class power amplifier.First the method carries out the dividing potential drop range of decrease, analog-to-digital conversion and normalized to power stage supply voltage, obtains normalized digital power noise signal; Then normalized digital power noise signal and interpolation filter output signal are multiplied each other and obtain error signal; Finally deduct the signal after this error signal is proofreaied and correct by interpolation filter output signal.Because the signal after this correction contains power stage power supply noise error compensation amount, so it is directly inputted to the power stage power supply noise error that can eliminate H bridge-type numeral D class power amplifier in sigma-delta modulator.Method provided by the present invention can, in the situation that not changing the existing inside modules structure of original H bridge-type numeral D class power amplifier, complete the elimination to power stage power supply noise error, and the method realization be simple, and error concealment effect is remarkable.
The technical solution adopted for the present invention to solve the technical problems is: a kind of power stage power supply noise error cancelling method for H bridge-type numeral D class power amplifier, is characterized in adopting following steps:
The first step: to power stage DC power supply voltage (V dD+ V n(t)) utilizing resistance to carry out the dividing potential drop range of decrease obtains
Figure BDA0000478178130000021
then right exclude DC component
Figure BDA0000478178130000023
after output to an ADC and obtain digitized power supply noise V' n(kT aDC).
Wherein, V dDfor desirable power stage power supply voltage, V n(t) be power stage power supply noise, G is constant, T aDCfor the sampling period of ADC output digit signals, k ∈ Z, t ∈ R;
Second step: according to the figure place L of first step ADC used and ADC full scale input peak-to-peak voltage value V fS, calculate normalized power stage power supply noise V by following formula " n(kT aDC):
V N ′ ′ ( kT ADC ) = V FS 2 L ( V DD G ) V N ′ ( kT ADC ) - - - ( 1 )
The 3rd step: V " n(kT aDC) be input in linear interpolation device obtain V " n(kT s), make sampling period of normalized power stage power supply noise be converted to the sampling period identical with the sampling period Ts of the sigma-delta modulator input signal of digital D class power amplifier;
The 4th step: utilize following formula to obtain the signal x after the error correction of power stage power supply noise sDM(kT s):
x SDM(kT s)=y IF(kT s)-V” N(kT s)×y IF(kT s)?（2）
Wherein, y iF(kT s) be the interpolation filter output signal of digital D class power amplifier; V " n(kT s) be normalized power stage power supply noise signal.By x sDM(kT s) be directly inputted in sigma-delta modulator, complete the power stage power supply noise error concealment of H bridge-type numeral D class power amplifier.
The invention has the beneficial effects as follows: first the method carries out the dividing potential drop range of decrease, analog-to-digital conversion and normalized to power stage supply voltage, obtain normalized digital power noise signal; Then normalized digital power noise signal and interpolation filter output signal are multiplied each other and obtain error signal; Finally deduct the signal after this error signal is proofreaied and correct by interpolation filter output signal.Because the signal after this correction contains power stage power supply noise error compensation amount, so it is directly inputted to the power stage power supply noise error that can eliminate H bridge-type numeral D class power amplifier in sigma-delta modulator.Method provided by the present invention can, in the situation that not changing the existing inside modules structure of original H bridge-type numeral D class power amplifier, complete the elimination to power stage power supply noise error, and the method realization be simple, and error concealment effect is remarkable.
Below in conjunction with the drawings and specific embodiments, the present invention is elaborated.
Accompanying drawing explanation
Fig. 1 is background technology H bridge-type numeral D class power amplifier structure schematic diagram;
Fig. 2 is the H bridge-type numeral D class power amplifier structure schematic diagram adopting after the inventive method;
Fig. 3 is the correction module structural representation of the embodiment of the present invention;
Fig. 4 is the test macro schematic diagram of the embodiment of the present invention;
Fig. 5 is the output spectrum of test macro H bridge-type numeral D class power amplifier in the time that correction module does not enable of Fig. 4;
Fig. 6 is the output spectrum of test macro H bridge-type numeral D class power amplifier in the time that correction module enables of Fig. 4;
Fig. 7 be Fig. 4 test macro respectively in the time that correction module does not enable and enables H bridge-type numeral D class power amplifier output THD+N with the test result of input sinusoidal test signal frequency change.
Embodiment
With reference to Fig. 2-7.The present invention is as follows for the power stage power supply noise error cancelling method concrete steps of H bridge-type numeral D class power amplifier:
The numeral of H bridge-type shown in accompanying drawing 1 D class power amplifier is adopted after power stage power supply noise error cancelling method of the present invention, and its structural representation as shown in Figure 2.
Contrast accompanying drawing 1 and accompanying drawing 2 are known, applying H bridge-type after power stage power supply noise error cancelling method provided by the present invention numeral D class power amplifier compares original structure and has only increased power supply noise Real-Time Monitoring circuit and correction module, and do not change the existing modules of original structure, thereby improved the applicability of the method that the invention provides.
From accompanying drawing 2, power stage power supply noise error cancelling method provided by the invention is realized by power supply noise Real-Time Monitoring circuit and two modules of correction module in actual applications.Respectively this two module is described below.
Power supply noise Real-Time Monitoring circuit is by resistance R 1, R 2, buffer circuit and ADC(Analog-to-Digital Converter, analog to digital converter) composition, its effect is monitoring power stage power supply noise and exports digitized power stage power supply noise.First power supply noise Real-Time Monitoring circuit utilizes resistance R 1and R 2to power stage supply voltage (V dD+ V n(t)) carry out dividing potential drop and obtain the power stage supply voltage after the range of decrease
Figure BDA0000478178130000041
then be input in buffer circuit, the power stage supply voltage of buffer circuit after to the range of decrease excludes DC component
Figure BDA0000478178130000042
and for driving ADC that an optimum genertor impedance and enough output currents are provided, the output signal of final buffer circuit is input to ADC, is converted to digitized power stage power supply noise V ' n(kT aDC) output in the correction module of digital D class power amplifier.
Correction module uses full-digital circuit to realize, and its structural representation as shown in Figure 3.Due to H bridge-type numeral D class power amplifier in audio bandwidth approximately linear and the contained main frequency composition of power stage power supply noise much smaller than the operating frequency of sigma-delta modulator in digital D class power amplifier, so correction module can utilize precompensation principle to eliminate the power stage power supply noise error of H bridge-type numeral D class power amplifier.Correction module is the digitlization power stage power supply noise V ' to input first n(kT aDC) utilize following formula to be normalized:
V N ′ ′ ( kT ADC ) = V FS 2 L V DD ( R 2 R 1 + R 2 ) V N ′ ( kT ADC ) - - - ( 1 )
Wherein V fSthe full scale that is respectively ADC in power supply noise Real-Time Monitoring circuit with L is inputted peak-to-peak voltage value and figure place.Then normalized power stage power supply noise V " n(kT aDC) make its sample frequency f by linear interpolation device aDC=1/T aDCbe converted to the sample frequency f identical with sigma-delta modulator input signal in digital D class power amplifier s=1/T s.Finally utilize following formula to obtain the signal x after the error correction of power stage power supply noise sDM(kT s):
X sDM(kT s)=y iF(kT s)-V " n(kT s) × y iF(kT s) (2) wherein y iF(kT s) be the interpolation filter output signal of digital D class power amplifier; V " n(kT s) be normalized power stage power supply noise signal.Due to x sDM(kT s) contain power stage power supply noise error compensation amount, so it is directly inputted to the power stage power supply noise error concealment that can complete H bridge-type numeral D class power amplifier in sigma-delta modulator.
Build test macro as shown in Figure 4 to verify the beneficial effect of the power stage power supply noise error cancelling method for H bridge-type numeral D class power amplifier provided by the present invention, the wherein power stage power supply (V of the numeral of the H bridge-type based on method provided by the present invention D class power amplifier dD+ V n(t)) use the non-voltage stabilizing linear DC of 55V power supply, because used power supply is formed by industrial frequency AC electric rectification, filtering, so it contains power frequency supply noise.
In the case of test signal be amplitude be-sinusoidal signal that 1dBFS, frequency are 1kHz, in the time that correction module does not enable, in accompanying drawing 4, the output spectrum of H bridge-type numeral D class power amplifier is as shown in Figure 5; In the time that correction module enables, in accompanying drawing, the output spectrum of H bridge-type numeral D class power amplifier as shown in Figure 6.From accompanying drawing 5, because power stage contains power frequency supply noise, the output spectrum of H bridge-type numeral D class power amplifier when correction module does not enable contains frequency input signal composition (f in=1kHz) and power supply noise frequency content (f noise=50Hz) intermodulation composition (f iMD=mf in± nf noise, m, n=1,2,3......), the amplitude maximum that wherein three intermodulation compositions (being 1100Hz and 900Hz) are located, its be about-52dBFS, and be greater than input signal harmonic frequency composition (f h=if in, i=2,3,4......) amplitude.And from accompanying drawing 6, because correction module enables, the situation when amplitude of the intermodulation composition being caused by input signal and power supply noise does not enable far below correction module, now three intermodulation become be about-92dBFS of the amplitude of office, far below the amplitude of input signal harmonic frequency composition.Comparison diagram 5 and Fig. 6 are known, and method provided by the invention has significantly reduced the output error being caused by power stage power supply noise.Accompanying drawing 7 has provided respectively in the time that correction module does not enable and enables, the output THD+N(Total Harmonic Distortion+Noise of H bridge-type numeral D class power amplifier in accompanying drawing 4, total harmonic distortion plus noise) with the test result (amplitude of input sinusoidal test signal is-1dBFS) of inputting sinusoidal test signal frequency change.From accompanying drawing 7, for using in the situation of non-voltage stabilizing power stage power supply, method provided by the present invention can significantly improve the signal fidelity of H bridge-type numeral D class power amplifier.

Claims (1)

1. for a power stage power supply noise error cancelling method for H bridge-type numeral D class power amplifier, it is characterized in that comprising the following steps:
The first step: to power stage DC power supply voltage (V dD+ V n(t)) utilizing resistance to carry out the dividing potential drop range of decrease obtains
Figure FDA0000478178120000011
then right
Figure FDA0000478178120000012
exclude DC component
Figure FDA0000478178120000013
after output to an ADC and obtain digitized power supply noise V ' n(kT aDC);
Wherein, V dDfor desirable power stage power supply voltage, V n(t) be power stage power supply noise, G is constant, T aDCfor the sampling period of ADC output digit signals, k ∈ Z, t ∈ R;
Second step: according to the figure place L of first step ADC used and ADC full scale input peak-to-peak voltage value V fS, calculate normalized power stage power supply noise V by following formula " n(kT aDC):
V N ′ ′ ( kT ADC ) = V FS 2 L ( V DD G ) V N ′ ( kT ADC ) - - - ( 1 )
The 3rd step: V " n(kT aDC) be input in linear interpolation device obtain V " n(kT s), make sampling period of normalized power stage power supply noise be converted to the sampling period identical with the sampling period Ts of the sigma-delta modulator input signal of digital D class power amplifier;
The 4th step: utilize following formula to obtain the signal x after the error correction of power stage power supply noise sDM(kT s):
x SDM(kT s)=y IF(kT s)-V” N(kT s)×y IF(kT s)?（2）
Wherein, y iF(kT s) be the interpolation filter output signal of digital D class power amplifier; V " n(kT s) be normalized power stage power supply noise signal; By x sDM(kT s) be directly inputted in sigma-delta modulator, complete the power stage power supply noise error concealment of H bridge-type numeral D class power amplifier.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109861648A (en) * 2019-01-15 2019-06-07 郑州轻工业学院 It is a kind of for exempting from the power stage errors bearing calibration of filtering figure D class power amplifier
CN110672936A (en) * 2019-09-11 2020-01-10 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） High-voltage capacitor inductance calibration method and device
CN111049481A (en) * 2018-10-15 2020-04-21 半导体元件工业有限责任公司 Audio amplifier with multiple sigma-delta modulators to drive an output load

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CN102037642A (en) * 2008-05-21 2011-04-27 硅实验室公司 Predictive feedback compensation for PWM switching amplifiers

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Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111049481A (en) * 2018-10-15 2020-04-21 半导体元件工业有限责任公司 Audio amplifier with multiple sigma-delta modulators to drive an output load
CN111049481B (en) * 2018-10-15 2024-05-10 半导体元件工业有限责任公司 Audio amplifier with multiple sigma-delta modulators to drive output loads
CN109861648A (en) * 2019-01-15 2019-06-07 郑州轻工业学院 It is a kind of for exempting from the power stage errors bearing calibration of filtering figure D class power amplifier
CN110672936A (en) * 2019-09-11 2020-01-10 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） High-voltage capacitor inductance calibration method and device

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