CN116761115B - Low-cost high-efficiency playback power supply control circuit and control method - Google Patents
Low-cost high-efficiency playback power supply control circuit and control method Download PDFInfo
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- CN116761115B CN116761115B CN202311006839.1A CN202311006839A CN116761115B CN 116761115 B CN116761115 B CN 116761115B CN 202311006839 A CN202311006839 A CN 202311006839A CN 116761115 B CN116761115 B CN 116761115B
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- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 18
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/03—Connection circuits to selectively connect loudspeakers or headphones to amplifiers
Abstract
The invention discloses a low-cost high-efficiency playback power supply control circuit and a control method, wherein the playback power supply control circuit comprises a power supply control module, a sound amplifying module and a threshold value generation comparison module, wherein a power supply output signal and a sound playing input signal are input to the threshold value generation comparison module for sampling to obtain a sampling signal, and the threshold value generation comparison module amplifies the sampling signal according to the amplification factor of the sound playing input signal so as to control the power supply output signal and the sound playing input signal to be in linear correlation; the audio input signal is also input to the amplifying module, amplified by the amplifying module and then output. The final boost voltage is attached to the final output voltage of the sound amplifying module as much as possible, and the output efficiency of the sound amplifying module and the power supply time of the sound amplifying module are improved.
Description
Technical Field
The invention relates to the field of audio circuit control, in particular to a low-cost high-performance audio power supply control circuit and a control method.
Background
As the demand for portable devices and electric vehicles increases, battery powered applications increase. In the case of battery powered, a power converter is often required to convert the voltage of the battery to the desired voltage.
At present, in order to realize larger loudness in the application of the playback device, larger power is required to be output, and at the moment, the voltage of the battery needs to be raised to supply power for the playback device, but extra power consumption is generated in the process of boosting, so that the output efficiency is reduced, and the higher the boosting is, the lower the output efficiency is, and the larger the energy loss is. Meanwhile, the energy consumption loss caused by the boosting can cause the shortening of the power supply time of the playback equipment.
However, in the working process of the playback device, the power supply voltage is not always required to be in a high-voltage working state, but is required to be adjusted according to the playback requirement, the power supply converter is only required to boost the discharge device when playing loud sound, the playback requirement can be met only by low or even no boost when playing small sound, in order to enable the exhaustion brought by boost to be as small as possible, the power supply time of the playback device is longer, and the boost is required to be attached to the voltage required by sound playing as much as possible.
Disclosure of Invention
The invention aims to provide a low-cost high-performance playback power supply control circuit and a control method thereof, which are used for controlling the boost voltage to be attached to the audio output voltage output by audio playback equipment as much as possible, so as to improve the output performance and the power supply duration of the audio playback equipment.
The invention provides a low-cost high-efficiency playback power supply control circuit, which comprises a power supply control module, a sound amplifying module and a threshold value generation comparison module;
the threshold value generation comparison module comprises a sampling unit and a control unit;
the sampling unit samples the audio input signal to obtain a sampling signal,
the control unit samples a power supply output signal and controls the power supply output signal to be in linear correlation with the sampling signal;
the audio input signal is also input to the amplifying module, amplified by the amplifying module and then output.
The sampling unit comprises an inverting amplifier, a voltage rectifying circuit, a first resistor and a second resistor;
the positive input end of the reverse amplifier is connected with bias voltage; the sound-amplifying input signal is rectified by the voltage rectifying circuit and then is input to the negative input end of the reverse amplifier through the first resistor, the negative input end is connected with the output end of the reverse amplifier through the second resistor, and the output end of the reverse amplifier is connected with the through comparator;
the control unit comprises an error amplifier and a boost circuit;
the sampling signal of the sound amplification input signal is input to the negative input end of the error amplifier through the booster circuit, the positive input end of the error amplifier inputs a bias voltage, and the error amplifier controls the power supply output signal to be in linear correlation with the sampling signal of the sound amplification input signal;
the boost circuit comprises a third resistor, a fourth resistor and a fifth resistor;
the output end of the inverting amplifier is connected with one end of the third resistor, the other end of the third resistor is connected between the fourth resistor and the fifth resistor, and the negative input end of the error amplifier is also connected between the fourth resistor and the fifth resistor; the power supply output signal is connected to the negative input end of the error amplifier through the fourth resistor and is grounded through the fourth resistor and the fifth resistor;
the ratio of the resistance value of the fourth resistor to the resistance value of the third resistor is the amplification factor of the audio input signal.
Further, the power supply control module comprises a first MOS tube and a second MOS tube;
the threshold value generation comparison module controls the conduction of the first MOS tube and the second MOS tube, a power supply input signal is input to the source electrode of the first MOS tube after passing through the source electrode of the second MOS tube, and the drain electrode of the first MOS tube outputs the power supply output signal; and the drain electrode of the second MOS tube is grounded.
The invention also provides a low-cost high-efficiency sound playing power supply control method, which adopts the low-cost high-efficiency sound playing control equipment, and comprises the following steps:
the sampling unit samples the audio input signal to obtain a sampling signal,
the control unit samples a power supply output signal and controls the power supply output signal to be in linear correlation with the sampling signal;
the audio input signal is also input to the amplifying module, amplified by the amplifying module and then output.
Further, the value of the sampling signal is；
Wherein Ain is the size of the audio input signal, vd is the bias voltage connected to the positive input end of the inverting amplifier, and k is the amplification factor.
Further, the power supply output signal has a value of；
Wherein Vref is a reference voltage value connected to the positive input end of the error amplifier, R4 is a resistance value of the fourth resistor, R3 is a resistance value of the third resistor, R5 is a resistance value of the fifth resistor, vs is a value of the sampling signal, and G is an amplification factor of the audio input signal.
Further, ifWhen->When vout=vin, where Ain is a value of an audio input signal, vin is a power supply input signal, and Vout is a power supply output signal;
obtaining the productWhere Vd is the bias voltage that is applied to the positive input of the inverting amplifier.
Further, when Vs is 0, the power supply output signal outputs a maximum value, where the maximum value is:
。
compared with the prior art, the invention has at least the following beneficial effects:
the invention sets a threshold value generation comparing module in the playback power supply control circuit, which comprises a sampling unit and a control unit, wherein the sampling unit samples the playback input signal to obtain a sampling signal, and the control unit samples the power supply output signal and controls the power supply output signal to be in linear correlation with the sampling signal; the audio output signal and the power supply output signal are attached as far as possible, and the output efficiency of the sound amplifying module and the power supply duration of the sound amplifying module are improved.
Furthermore, the threshold value generation comparison module provided by the invention has a simple structure, can realize the improvement of output efficiency only by the reverse amplifier, the voltage rectification circuit, the error amplifier and the resistor, and has lower preparation cost.
Drawings
FIG. 1 is a block diagram of a sound reproducing power supply control circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a sound reproducing power supply control circuit according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a voltage rectifying circuit according to an embodiment of the invention;
fig. 4 is a control effect diagram of the playback power supply voltage in the first embodiment of the invention.
Detailed Description
In the following, a low cost and high performance playback power control circuit and control method of the present invention are shown in the drawings, wherein preferred embodiments of the present invention are described, it being understood that those skilled in the art can modify the invention described herein while still achieving the advantageous effects of the invention. Accordingly, the following description is to be construed as broadly known to those skilled in the art and not as limiting the invention.
The invention is more particularly described by way of example in the following paragraphs with reference to the drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
Example 1
The embodiment provides a playback power control circuit with low cost and high efficiency, and concretely referring to fig. 1, the playback power control circuit comprises a power supply control module, a sound amplifying module and a threshold value generation comparison module;
the threshold value generation comparison module comprises a sampling unit and a control unit;
the sampling unit samples the audio input signal Ain to obtain a sampling signal,
the control unit samples a power supply output signal Vout and controls the power supply output signal Vout to be in linear correlation with the sampling signal;
the audio input signal Ain is also input to the amplifying module, amplified by the amplifying module and then output.
The power supply output signal Vout is sampled such that the final output voltage value of the threshold generation comparison module is correlated with Vout.
Referring to fig. 2, specifically, the sampling unit includes an inverting amplifier 2, a voltage rectifying circuit, a first resistor R1 and a second resistor R2.
The positive input end of the reverse amplifier 2 is connected with a bias voltage Vd; after being rectified by the voltage rectifying circuit, the audio input signal Ain is input to the negative input end of the reverse amplifier 2 through the first resistor R1, and the negative input end is connected with the output end of the reverse amplifier 2 through the second resistor R2.
The power control module boosts a certain time due to the current limit of the power input signal Vin. Therefore, in order to ensure that the power supply output signal Vout is of a magnitude that meets the output requirements of the amplifying module, it is necessary to make the final power supply output signal Vout larger than the power supply voltage required by the amplifying module. Thus, the present example finally outputs a signal of magnitude through the inverting amplifier 2So that the final output supply output signal Vout can be greater than the supply voltage required by the loudspeaker module.
Referring to fig. 3, in a specific example, the voltage rectifying circuit includes a comparator C1, an inverting amplifier, a sixth resistor R6, a seventh resistor R7, a first switch S1 and a second switch S2.
The audio input signal Ain is input to the input end of the inverting amplifier through the sixth resistor R6, and the seventh resistor R7 is connected in parallel with the input end and the output end of the inverting amplifier; the audio input signal Ain is amplified by the inverting amplifier and then is input to the negative input end of the comparator C1, and the negative input end of the comparator C1 is connected with the first output end of the comparator C1 through the first switch S1; the audio input signal Ain is also input to the positive input end of the comparator C1, and the positive input end of the comparator C1 is connected with the second output end of the comparator C1 through the second switch S2; the first switch S1 and the second switch S2 output the audio input signal Ain to the inverting amplifier 2.
In this example, the voltage rectifying circuit full-wave rectifies the audio input signal Ain to obtain a signal having a magnitude ofIs provided.
Further, referring to fig. 2 again, the control unit includes an error amplifier 1 and a boost circuit;
the sampling signal of the audio input signal Ain is input to the negative input end of the error amplifier 1 through the boost circuit, the positive input end of the error amplifier 1 inputs a reference voltage Vref, and the error amplifier 1 controls the power supply output signal Vout.
The booster circuit includes a third resistor R3, a fourth resistor R4, and a fifth resistor R5.
The output end of the inverting amplifier 2 is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected between the fourth resistor R4 and the fifth resistor R5, and the negative input end of the error amplifier 1 is also connected between the fourth resistor R4 and the fifth resistor R5; the power supply output signal Vout is connected to the negative input end of the error amplifier 1 through the fourth resistor R4, and is grounded through the fourth resistor R4 and the fifth resistor R5.
In this example, the power control module ultimately outputs a power of the magnitudeWherein Vref is a reference voltage value connected to the positive input end of the error amplifier 1, R4 is the resistance value of the fourth resistor, R3 is the resistance value of the third resistor, R5 is the resistance value of the fifth resistor, and Vs is the sampling signal. It will be appreciated that->Since the resistance of the fourth resistor R4 is G times that of the third resistor R3, the power supply output signals Vout and +.>The linear correlation, corresponding to the amplification G, may correspond to the amplitude of the audio-visual input signal Vin. So that the final audio output voltage Aout is as close to the power supply output voltage Vout as possible.
Further, the power supply control module includes a first MOS transistor M1 and a second MOS transistor M2.
The power supply input signal Vin is input to the source electrode of the first MOS transistor M1 after passing through the source electrode of the second MOS transistor M2, and the drain electrode of the first MOS transistor M1 outputs the power supply output signal Vout; the drain electrode of the second MOS tube M2 is grounded.
Referring to fig. 4, let the amplification factor of the amplifying module be G, and the final output signal of the amplifying module beThe larger the audio input signal Ain is, the larger the audio output signal Aout is, and the larger the power supply output signal Vout is, the power supply output signal Vout is according to ∈x according to the audio input signal Ain>The setting of (2) is used for boosting, so that the final playback requirement is met, the boosting amplitude of the power supply output signal Vout is reduced as much as possible, and the efficiency loss is reduced. The audio output signal Aout and the power supply output signal Vout are attached as much as possible, so as to improve the output efficiency of the amplifying module and the power supply duration of the amplifying module.
Example two
The present embodiment provides a low-cost and high-performance playback power control method, which adopts the playback power control device in the first embodiment, and the method includes:
the sampling unit samples the audio input signal Ain to obtain a sampling signal,
the control unit samples a power supply output signal Vout and controls the power supply output signal Vout to be in linear correlation with the sampling signal;
the audio input signal Ain is also input to the amplifying module, amplified by the amplifying module and then output.
When the system is in a straight-through state, the first MOS tube M1 of the power supply control module is conducted, the second MOS tube M2 of the power supply control module is closed, at the moment, the power supply control module does not boost the voltage of the sound amplifying module, and the efficiency of the sound amplifying module is highest.
When the system needs to boost, the first MOS tube M1 is conducted, the second MOS tube M2 is also conducted, and the error amplifier 1 controls the power supply control module to boost the sound amplifying module.
Specifically, the value of the sampling signal isWherein Ain is the audio input signal, vd is the bias voltage connected to the positive input end of the inverting amplifier 2, and k is the amplification factor. The value of the power supply output signal Vout is +.>. Wherein Vref is a reference voltage value connected to the positive input end of the error amplifier 1, and R4 is the resistance of the fourth resistorThe value R3 is the resistance of the third resistor, R5 is the resistance of the fifth resistor, vs is the value of the sampling signal, and G is the amplification factor of the audio input signal, namely the amplification factor of the amplifying module.
In an ideal state, the amplification factor of the amplifying module is not considered, the value of k is set to be 1, the value of Vd is set to be 0, and the power supply output signal Vout and the audio output signal Aout can be completely attached. However, the specific values of k and Vd are also affected by the boosting speed, and k can only be set as close to 1 as possible, and Vd is set as close to 0. In a specific example, if the boost speed is higher, the smaller the value of k is, the smaller Vd is, and at this time, the smaller the margin provided by the threshold value generation comparison module is. When the boosting speed is slower, the larger the value of k is set, the larger Vd is, and at the moment, the margin provided by the threshold value generation comparison module is larger. The above arrangement meets the output requirement of the sound amplifying module, and makes the power supply output signal Vout and the sound amplifying output signal Aout fit as much as possible.
In this example, when k=1,. When the audio input signal Ain is smaller, the power supply control module is in a straight-through mode, and at the moment, the system does not need to boost, and the output requirement of the audio amplifying module can be met>The magnitude of the power supply output signal Vout is just the magnitude of the power supply input signal Vin.
Then the first time period of the first time period,。
it is thus possible to obtain,。
from the following componentsWhen Vs is 0, the power supply output signal Vout outputs a maximum value, which is: />。
Combined standAnd->Available, vd=vout_max/G.
The technical effects achieved by the present embodiment are the same as those achieved by the playback power supply control circuit of the first embodiment, and are not described herein.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (7)
1. The playback power supply control circuit with low cost and high efficiency is characterized by comprising a power supply control module, a sound amplifying module and a threshold value generation comparison module;
the threshold value generation comparison module comprises a sampling unit and a control unit;
the sampling unit samples the audio input signal to obtain a sampling signal,
the control unit samples a power supply output signal and controls the power supply output signal to be in linear correlation with the sampling signal;
the sound input signal is also input to the sound amplifying module, amplified by the sound amplifying module and then output;
the sampling unit comprises an inverting amplifier, a voltage rectifying circuit, a first resistor and a second resistor;
the positive input end of the reverse amplifier is connected with bias voltage; the sound input signal is rectified by the voltage rectifying circuit and then is input to the negative input end of the reverse amplifier through the first resistor, and the negative input end is also connected with the output end of the reverse amplifier through the second resistor;
the control unit comprises an error amplifier and a boost circuit;
the sampling signal of the sound amplification input signal is input to the negative input end of the error amplifier through the booster circuit, the positive input end of the error amplifier inputs a reference voltage, and the error amplifier controls the power supply output signal to be in linear correlation with the sampling signal of the sound amplification input signal;
the boost circuit comprises a third resistor, a fourth resistor and a fifth resistor;
the output end of the inverting amplifier is connected with one end of the third resistor, the other end of the third resistor is connected between the fourth resistor and the fifth resistor, and the negative input end of the error amplifier is also connected between the fourth resistor and the fifth resistor; the power supply output signal is connected to the negative input end of the error amplifier through the fourth resistor and is grounded through the fourth resistor and the fifth resistor;
the ratio of the resistance value of the fourth resistor to the resistance value of the third resistor is the amplification factor of the audio input signal.
2. The playback power supply control circuit with low cost and high performance as set forth in claim 1, wherein the power supply control module comprises a first MOS tube and a second MOS tube;
the threshold value generation comparison module controls the conduction of the first MOS tube and the second MOS tube, a power supply input signal is input to the source electrode of the first MOS tube after passing through the source electrode of the second MOS tube, and the drain electrode of the first MOS tube outputs the power supply output signal; and the drain electrode of the second MOS tube is grounded.
3. A low cost high performance playback power control method employing a low cost high performance playback power control circuit as recited in any one of claims 1-2, the method comprising:
the sampling unit samples the audio input signal to obtain a sampling signal,
the control unit samples a power supply output signal and controls the power supply output signal to be in linear correlation with the sampling signal;
the audio input signal is also input to the amplifying module, amplified by the amplifying module and then output.
4. The method for controlling a low cost and high performance playback power supply of claim 3,
the value of the sampling signal is；
Wherein Ain is the sound amplification input signal, vd is the bias voltage of the positive input end of the inverting amplifier in the sampling unit, and k is the amplification factor.
5. The method of claim 4, wherein the power supply output signal has a value of；
Wherein Vref is a reference voltage value of a positive input end of an error amplifier in the control unit, R4 is a resistance value of a fourth resistor in a boost circuit of the control unit, R3 is a resistance value of a third resistor in the boost circuit of the control unit, R5 is a resistance value of a fifth resistor in the boost circuit of the control unit, vs is the sampling signal, and G is the amplification factor of the audio input signal.
6. The method of claim 5, wherein ifWhen->When vout=vin, wherein Ain is an audio input signal, vin is a power supply input signal, and Vout is a power supply output signal;
obtaining the productWherein Vd is bias voltage connected to the positive input end of the inverting amplifier.
7. The method of claim 5, wherein,
when Vs is 0, the power supply output signal outputs a maximum value, the maximum value being:
。
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