CN111786640A - Automatic compression ratio control device and control method of power amplifier - Google Patents
Automatic compression ratio control device and control method of power amplifier Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/56—Modifications of input or output impedances, not otherwise provided for
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
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Abstract
The invention discloses an automatic compression ratio control device and a control method for a power amplifier, which solve the problem that the traditional power amplifier cannot continuously output sound because of overhigh temperature. The automatic compression ratio control device of the power amplifier comprises a microcontroller, and a power input terminal, a first analog-to-digital converter, a digital signal processor, a digital-to-analog converter, a power amplifier and a power output terminal of the compressor, which are electrically connected in sequence, wherein the digital signal processor and the power amplifier are both electrically connected with the microcontroller, a radiator temperature detector is arranged between the microcontroller and the power amplifier, the digital signal processor is integrated with an RMS voltage detector, a level converter, a level comparator, a gain smooth updater and a gain controller, which are electrically connected in sequence, and signals input by the first analog-to-digital converter respectively enter the RMS voltage detector and the gain controller. The invention is applied to the technical field of electronics.
Description
Technical Field
The present invention relates to a device and a method for controlling an automatic compression ratio of a power amplifier, and more particularly, to a device and a method for controlling an automatic compression ratio of a power amplifier by temperature and output power.
Background
The existing AB type power amplifier has larger dissipation power consumption to cause serious heating, an over-temperature protection circuit is often adopted to protect the power amplifier device for protecting the power amplifier device from being damaged due to overhigh temperature, and the over-temperature protection circuit can only directly cut off power amplification when the temperature exceeds a certain set critical temperature, so that power amplifier equipment cannot continue to output sound, and the interruption of sound output influences user experience.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and solve the problems of the traditional automatic compression ratio control device and the control method of the power amplifier which can not continuously output sound because of overhigh temperature.
The technical scheme adopted by the invention is as follows: the automatic compression ratio control device of the power amplifier comprises a microcontroller, and a power input terminal, a first analog-to-digital converter, a digital signal processor, a digital-to-analog converter, a power amplifier and a power output terminal of the compressor, which are electrically connected in sequence, wherein the digital signal processor and the power amplifier are both electrically connected with the microcontroller, a radiator temperature detector is arranged between the microcontroller and the power amplifier, the digital signal processor is integrated with an RMS voltage detector, a level converter, a level comparator, a gain smooth updater and a gain controller, which are electrically connected in sequence, and signals input by the first analog-to-digital converter respectively enter the RMS voltage detector and the gain controller.
Furthermore, a compression ratio input module, an activation time module, a release time module and a starting threshold module which are all electrically connected with the microcontroller are integrated on the word signal processor, the compression ratio input module, the activation time module and the release time module are all in signal connection with the gain smooth updater, and the starting threshold module is in signal connection with the level comparator.
Furthermore, an anti-aliasing filter is arranged between the power input terminal and the analog-to-digital converter, and an analog low-pass filter is arranged between the digital-to-analog converter and the power amplifier.
Furthermore, an output voltage detector and an output current detector are arranged between the microcontroller and the power output terminal in parallel, and a detection circuit module is also arranged between the output voltage detector and the microcontroller.
Furthermore, the detection circuit module comprises a signal attenuator, a full-wave rectifier, a second low-pass filter and a second analog-to-digital converter which are electrically connected in sequence.
Further, the method for controlling the automatic compression ratio of the power amplifier comprises the following steps:
a. the input terminal inputs the signal into a first analog-to-digital converter after passing through an anti-aliasing filter, and the first analog-to-digital converter converts the analog signal into a digital signal and inputs the digital signal into an RMS voltage detector;
the RMS voltage detector detects the effective value of the analog-to-digital converter according to the signal output by the analog-to-digital converter and inputs the detected value to a level converter;
c. the level converter converts the numerical value input by the RMS voltage detector into the numerical value which is the same as the unit of the starting threshold module, and the converted numerical value and the numerical value of the starting threshold module are transmitted into the level comparator to be compared with each other;
d. the gain smooth updater manually inputs the parameters of the start control time module and the release time module through the microcontroller, automatically updates the parameters of the compression ratio input module through the microcontroller, and then updates the parameters of the gain controller through the gain smooth updater;
e. when the compressor is not started, the output result of the level comparator is false, namely the output value of the level converter is smaller than the value of the starting threshold module, and the previous state is a through state, the value output to the smooth updater by the level comparator enables the gain controller to be in the through state, and the compressor is not started at this moment;
f. when the compressor starts, the output result of the level comparator is true, that is, the output value of the level shifter is greater than the value of the start threshold module, the output control gain can be obtained by the following equation: gain _ db (n) ((in _ dbu (n) -thd _ dBu) ((1/R) + thd _ dBu) -in _ dbu (n)); wherein gain _ db (n) is the compressed gain, in _ dbu (n) input level, thd _ dBu threshold level, and R is the compression ratio calculated by the microcontroller, and the gain smoothing can be calculated by the following equation env (n) (1-theta) env (n-1) + theta f (n); wherein f is 10(gain _ db (n)/20), env (n) is the smoothed gain, and the theta smoothing coefficient can be calculated by the control starting time and the release time.
Further, the step d of automatically updating the parameters of the compression ratio input module by the microcontroller comprises the following steps: d1. the output voltage detector and the output current detector are both transmitted to the microcontroller for compression ratio processing after passing through the detection circuit module; d2. the automatic compression ratio is controlled by temperature and output power, and the compression ratio is automatically calculated in a microcontroller according to the following equation, wherein R is K1+ K2 (T-T0) + K3 (P-P0), K1, K2 and K3 are self-defined coefficients, T is the temperature of a radiator, T0 is the starting temperature, P is the output power, P0 is the starting output power, when T < T0, (T-T0) <0, the temperature does not affect the ratio R, the compression ratio R is kept unchanged, and when T > T0, (T-T0) >0, the temperature of the radiator automatically controls the compression ratio R; when P < P0, (P-P0) <0, the temperature does not affect the ratio R, the compression ratio R is kept unchanged, and when P > P0, (P-P0) >0, the output power automatically controls the compression ratio R.
Further, in the step d1, the output voltage detector and the output current detector are attenuated by the signal attenuator in the detection circuit module, input to the full-wave rectifier for full-wave rectification, input to the low-pass filter two, input to the second analog-to-digital converter, and output to the microcontroller through the second analog-to-digital converter for compression ratio processing
The invention has the beneficial effects that: the invention is implemented by combining software and hardware, the signal input by the input terminal of the compressor is input to the analog-to-digital converter through the anti-aliasing filtering of analog low pass, the signal is input to the digital signal processor from the analog-to-digital converter for processing, the processed signal is output to the digital-to-analog converter, the digital-to-analog converter is output to the analog low pass filter and is reduced into an analog signal, the analog signal is output through the power amplifier, and the input and the storage of each manual parameter are controlled by the microcontroller.
Drawings
FIG. 1 is a schematic diagram of the principles of the present invention;
FIG. 2 is a schematic diagram of controlling gain;
fig. 3 is a schematic diagram of a detection circuit module.
Detailed Description
As shown in fig. 1 to fig. 3, in this embodiment, the present invention includes an automatic compression ratio control apparatus and a control method for a power amplifier, where the automatic compression ratio control apparatus for a power amplifier includes a microcontroller 1, and a power input terminal 2, a first analog-to-digital converter 3, a digital signal processor 4, a digital-to-analog converter 5, a power amplifier 6, and a power output terminal 7 of a compressor, which are electrically connected in sequence, the digital signal processor 4 and the power amplifier 6 are both electrically connected to the microcontroller 1, a heat sink temperature detector 8 is disposed between the microcontroller 1 and the power amplifier 6, an RMS voltage detector 41, a level converter 42, a level comparator 43, a gain smoothing and updating device 44, and a gain controller 45, which are electrically connected in sequence, are integrated on the digital signal processor 4, and signals input by the first analog-to-digital converter 3 enter the RMS voltage detector 41 and the gain controller 45, respectively.
In this embodiment, the digital signal processor further integrates a compression ratio input module 46, an activation time module 47, a release time module 48 and a start threshold module 49, all of which are electrically connected to the microcontroller 1, the compression ratio input module 46, the activation time module 47 and the release time module 48 are all in signal connection with the gain smoothing updater 44, the start threshold module 49 is in signal connection with the level comparator 43, the start value of the start threshold module 49 is a threshold for starting the compressor, the compression ratio input module 46 is a ratio of the magnitude of the compressor decay, the input activation time of the activation time module 47 is a time required for the compressor to rise or decay to a target level, the input release time of the release time module 48 is a release time required for the compressor to recover to a unit gain, the gain smoothing updater 44 is used for updating gain smoothing, abrupt noise caused by abrupt changes in the compressor start-up time parameter has been overcome.
In this embodiment, an anti-aliasing filter 9 is further disposed between the power input terminal 2 and the analog-to-digital converter, and an analog low-pass filter 10 is further disposed between the digital-to-analog converter 5 and the power amplifier 6.
In this embodiment, an output voltage detector 11 and an output current detector 12 are connected in parallel between the microcontroller 1 and the power output terminal 7, and a detection circuit module is further disposed between the microcontroller 1 and the output voltage detector 11 and the output current detector 12.
In this embodiment, the detection circuit module includes a signal attenuator 13, a full-wave rectifier 14, a second low-pass filter 15, and a second analog-to-digital converter 16, which are electrically connected in sequence.
In the present embodiment, the control method of the automatic compression ratio control apparatus includes the steps of:
a. the input terminal inputs the signal into the first analog-to-digital converter 3 after passing through the anti-aliasing filter 9, the first analog-to-digital converter 3 converts the analog signal into a digital signal and inputs the digital signal into the RMS voltage detector 41;
the rms voltage detector 41 detects the effective value of the signal output from the analog-to-digital converter and inputs the detected value to the level shifter 42;
c. the level shifter 42 converts the value inputted from the RMS voltage detector 41 into a value having the same unit as that of the start threshold module 49, and transmits the converted value and the value of the start threshold module 49 to the level comparator 43 for comparison;
d. the gain smooth updater 44 manually inputs the parameters of the start control time module 47 and the release time module 48 through the microcontroller 1, automatically updates the parameters of the compression ratio input module 46 through the microcontroller 1, and then the gain smooth updater 44 updates the parameters of the gain controller 45;
e. when the compressor is not started, the output result of the level comparator 43 is false, that is, the output value of the level shifter 42 is smaller than the value of the start threshold module 49, and the previous state is the through state, the level comparator 43 outputs the value of the smooth updater to make the gain controller 45 be the through state, and at this time, the compressor is not started;
f. when the compressor starts up, the output of the level comparator 43 is true, i.e. the output value of the level shifter 42 is greater than the value of the start threshold module 49, then the output control gain can be obtained by the following equation: gain _ db (n) ((in _ dbu (n) -thd _ dBu) ((1/R) + thd _ dBu) -in _ dbu (n)); wherein gain _ db (n) is the compressed gain, in _ dbu (n) input level, thd _ dBu threshold level, and R is the compression ratio calculated by the microcontroller 1, and the gain smoothing can be calculated by the following equation env (n) (1-theta) env (n-1) + theta f (n); wherein f is 10(gain _ db (n)/20), env (n) is the smoothed gain, and the theta smoothing coefficient can be calculated by the control starting time and the release time.
In this embodiment, the microcontroller 1 automatically updating the parameters of the compression ratio input module 46 in step d includes the following steps: d1. the output voltage detector 11 and the output current detector 12 are both transmitted to the microcontroller 1 through the detection circuit module to be subjected to compression ratio processing; d2. the automatic compression ratio is controlled by temperature and output power, and the compression ratio is automatically calculated in the microcontroller 1 according to the following equation, wherein R is K1+ K2 (T-T0) + K3 (P-P0), wherein K1, K2 and K3 are self-defined coefficients, T is the temperature of the radiator, T0 is the starting temperature, P is the output power, P0 is the starting output power, when T < T0, (T-T0) <0, the temperature does not affect the ratio R, the compression ratio R is kept unchanged, and when T > T0, (T-T0) >0, the temperature of the radiator automatically controls the compression ratio R; when P < P0, (P-P0) <0, the temperature does not affect the ratio R, the compression ratio R is kept unchanged, and when P > P0, (P-P0) >0, the output power automatically controls the compression ratio R.
In this embodiment, in step d1, the output voltage detector 11 and the output current detector 12 are attenuated by the signal attenuator 13 in the detection circuit module, and then input to the full-wave rectifier 14 for full-wave rectification, then input to the low-pass filter two 15, and then input to the second analog-to-digital converter 16, and finally output to the microcontroller 1 through the second analog-to-digital converter 16 for compression ratio processing.
The invention is applied to the technical field of electronics.
While the embodiments of the present invention have been described in terms of practical embodiments, they are not to be construed as limiting the meaning of the present invention, and modifications of the embodiments and combinations with other embodiments will be apparent to those skilled in the art in light of the present description.
Claims (8)
1. An automatic compression ratio control device of a power amplifier, characterized in that: it comprises a microcontroller (1), and a power input terminal (2), a first analog-to-digital converter (3), a digital signal processor (4), a digital-to-analog converter (5), a power amplifier (6) and a power output terminal (7) which are electrically connected in sequence, the digital signal processor (4) and the power amplifier (6) are both electrically connected with the microcontroller (1), a radiator temperature detector (8) is arranged between the microcontroller (1) and the power amplifier (6), the digital signal processor (4) is integrated with an RMS voltage detector (41), a level converter (42), a level comparator (43), a gain smooth updater (44) and a gain controller (45) which are electrically connected in turn, the signal input by the first analog-to-digital converter (3) enters the RMS voltage detector (41) and the gain controller (45), respectively.
2. The automatic compression ratio control apparatus of a power amplifier according to claim 1, characterized in that: the digital signal processor is further integrated with a compression ratio input module (46), an activation time module (47), a release time module (48) and a starting threshold module (49) which are all electrically connected with the microcontroller (1), the compression ratio input module (46), the activation time module (47) and the release time module (48) are all in signal connection with the gain smooth updater (44), and the starting threshold module (49) is in signal connection with the level comparator (43).
3. The automatic compression ratio control apparatus of a power amplifier according to claim 2, characterized in that: an anti-aliasing filter (9) is further arranged between the power input terminal (2) and the analog-to-digital converter, and an analog low-pass filter (10) is further arranged between the digital-to-analog converter (5) and the power amplifier (6).
4. The automatic compression ratio control apparatus of a power amplifier according to claim 3, characterized in that: an output voltage detector (11) and an output current detector (12) are arranged between the microcontroller (1) and the power output terminal (7) in parallel, and a detection circuit module is further arranged between the output voltage detector (11) and the output current detector (12) and the microcontroller (1).
5. The automatic compression ratio control apparatus of a power amplifier according to claim 4, characterized in that: the detection circuit module comprises a signal attenuator (13), a full-wave rectifier (14), a second low-pass filter (15) and a second analog-to-digital converter (16) which are electrically connected in sequence.
6. A control method of an automatic compression ratio control apparatus including the power amplifier of claim 5, characterized by comprising the steps of:
a. the input terminal inputs the signal into a first analog-to-digital converter (3) after passing through an anti-aliasing filter (9), and the first analog-to-digital converter (3) converts the analog signal into a digital signal and inputs the digital signal into an RMS voltage detector (41);
an RMS voltage detector (41) detects the effective value of the analog-to-digital converter according to the output signal of the analog-to-digital converter and inputs the detected value to a level converter (42);
c. the level converter (42) converts the value input by the RMS voltage detector (41) into the value with the same unit as that of the starting threshold module (49), and the converted value and the value of the starting threshold module (49) are transmitted into the level comparator (43) to be compared;
d. the gain smooth updater (44) manually inputs the parameters of the start control time module (47) and the release time module (48) through the microcontroller (1), automatically updates the parameters of the compression ratio input module (46) through the microcontroller (1), and then the gain smooth updater (44) updates the parameters of the gain controller (45);
e. when the compressor is not started, the output result of the level comparator (43) is false, namely the output value of the level converter (42) is smaller than the value of the starting threshold module (49), and the previous state is a through state, the value output to the smooth updater by the level comparator (43) enables the gain controller (45) to be in the through state, and the compressor is not started at the moment;
f. when the compressor starts, the output result of the level comparator (43) is true, that is, the output value of the level shifter (42) is greater than the value of the start threshold module (49), then the output control gain can be obtained by the following equation: gain _ db (n) ((in _ dbu (n) -thd _ dBu) ((1/R) + thd _ dBu) -in _ dbu (n)); wherein gain _ db (n) is the compressed gain, in _ dbu (n) input level, thd _ dBu threshold level, and R is the compression ratio calculated by the microcontroller (1), and gain smoothing may be calculated by the following equation, (1-theta) env (n-1) + theta f (n); wherein f is 10(gain _ db (n)/20), env (n) is the smoothed gain, and the theta smoothing coefficient can be calculated by the control starting time and the release time.
7. The automatic compression ratio control method of a power amplifier according to claim 6, characterized in that: the microcontroller (1) in step d automatically updating the parameters of the compression ratio input module (46) comprises the following steps:
d1. the output voltage detector (11) and the output current detector (12) are transmitted to the microcontroller (1) through the detection circuit module to be subjected to compression ratio processing; d2. the automatic compression ratio is controlled by temperature and output power, and the compression ratio is automatically calculated in the microcontroller (1) according to the following equation, wherein R is K1+ K2 (T-T0) + K3 (P-P0), K1, K2 and K3 are self-defined coefficients, T is the temperature of a radiator, T0 is the starting temperature, P is the output power, P0 is the starting output power, when T < T0, (T-T0) <0, the temperature does not affect the ratio R, the compression ratio R is kept unchanged, and when T > T0, (T-T0) >0, the temperature of the radiator automatically controls the compression ratio R; when P < P0, (P-P0) <0, the temperature does not affect the ratio R, the compression ratio R is kept unchanged, and when P > P0, (P-P0) >0, the output power automatically controls the compression ratio R.
8. The automatic compression ratio control method of a power amplifier according to claim 7, characterized in that: in the step d1, the output voltage detector (11) and the output current detector (12) are attenuated by the signal attenuator (13) in the detection circuit module, input to the full-wave rectifier (14) for full-wave rectification, then input to the low-pass filter II (15), input to the second analog-to-digital converter (16), and finally output to the microcontroller (1) through the second analog-to-digital converter (16) for compression ratio processing.
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