CN107864435B - Audio power control method, control circuit and audio equipment - Google Patents
Audio power control method, control circuit and audio equipment Download PDFInfo
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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
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
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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
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Abstract
The invention provides a control method, a control circuit and audio equipment of audio power. The control method of the audio power comprises the following steps: the power supply detection module detects the type of an input power supply and sends a detection signal to the system control module; the input power supply type comprises an external alternating current power supply and a battery power supply; the system control module judges the type of the input power supply as an external alternating current power supply according to the detection signal and controls the power amplification module to work in a bridging mode; the output feedback module detects the output signal level and sends an output feedback signal to the system control module; the system control module judges that the output feedback signal is larger than a set value, and controls the numerical control power supply module to increase the working voltage of the power amplification module to a preset first working voltage. The invention can determine the working mode and the working voltage of the power amplification module according to the type of the input power supply and the power required by the load loudspeaker, and can achieve the purposes of improving the power amplification effect of the audio frequency and prolonging the duration of the battery.
Description
Technical Field
The present invention relates to information processing and electronic circuit technology, and more particularly to a control method for audio power, a control circuit and an audio device.
Background
When the existing sound box equipment is connected with an external power supply or is powered by a battery, the power output can be changed in two ways. The first way is: by setting the boosting module, the output voltage of the boosting module is regulated, and then the power supply voltage of the amplifier is changed to change the output power. The second way is: changing the output voltage by adopting a mode of bridging two or more power amplifiers, thereby changing the power supply voltage of the amplifiers so as to change the output power; when the sound box supplies power for an external power supply, the sound box can achieve good sound effect by improving the output power in the mode. However, when the sound box is powered by the battery, the output power is increased to limit the working time of the sound box due to the capacity of the battery, so that the user experience is greatly reduced. In the prior art, a power control circuit capable of automatically controlling output power to prolong effective working time and realize good sound effect is lacked, so that the output power is changed according to the change of listening environment.
Disclosure of Invention
The present invention aims at solving at least one of the above technical drawbacks, and particularly to a power amplifier module for increasing the power of an external ac power supply.
The invention provides a control method of audio power, which comprises the following steps:
the power supply detection module detects the type of an input power supply and sends a detection signal to the system control module; the input power supply type comprises an external alternating current power supply and a battery power supply;
the system control module judges the type of the input power supply as an external alternating current power supply according to the detection signal and controls the power amplification module to work in a bridging mode;
the output feedback module detects the output signal level and sends an output feedback signal to the system control module;
the system control module judges that the output feedback signal is larger than a set value, and controls the numerical control power supply module to increase the working voltage of the power amplification module to a preset first working voltage.
Preferably, the power supply detection module detects the input power supply type, and after sending a detection signal to the system control module, the power supply detection module further includes:
the system control module judges the input power supply type as a battery power supply according to the detection signal and controls the power amplification module to work in a single power amplifier mode.
Preferably, the power supply detection module detects the input power supply type, and after sending a detection signal to the system control module, the power supply detection module further includes:
and when the system control module judges that the input power type is changed from an external alternating current power supply to a battery power supply according to the detection signal, the numerical control power supply module is controlled to gradually reduce the working voltage of the power amplification module.
Further, the controlling the digitally controlled power module to gradually reduce the operating voltage of the power amplifying module includes:
the numerical control power supply module is controlled to gradually reduce the current working voltage to a preset second working voltage;
the control power amplification module is converted from a bridge mode to a single power amplifier mode.
Further, the controlling the digital control power module to gradually reduce the current working voltage to a preset second working voltage includes:
acquiring the current working voltage of the numerical control power supply module;
multiplying the current operating voltage by 95% to obtain the next operating voltage;
judging whether the next working voltage is smaller than a preset second working voltage, if so, controlling the numerical control power supply module to reduce the current working voltage to the preset second working voltage; otherwise, receiving the output signal level detected by the feedback module, and multiplying the output signal level by 98% to be used as a threshold value;
controlling the numerical control power supply module to reduce the current working voltage to the next working voltage;
and receiving the output signal level detected by the feedback module, and when the received current output signal level is smaller than a threshold value, taking the next working voltage as the current working voltage, and returning to the step of multiplying the current working voltage by 95% to obtain the next working voltage.
Preferably, the output feedback module detects the output signal level, and after sending the output feedback signal to the system control module, the method further includes:
the system control module judges that the output feedback signal is smaller than the set value, and controls the numerical control power supply module to set the working voltage of the power amplification module to be a third working voltage.
The invention also provides a control circuit of audio power, comprising:
the power supply detection module is used for detecting the type of an input power supply, sending detection signals to the system control module, wherein the type of the input power supply comprises an external alternating current power supply and a battery power supply;
the system control module is used for judging the type of the input power supply as an external alternating current power supply according to the detection signal, controlling the power amplification module to work in a bridging mode, judging that the output feedback signal is larger than a set value, and controlling the numerical control power supply module to increase the working voltage of the power amplification module to a preset first working voltage;
the numerical control power supply module is used for outputting the working voltage of the power amplifying module according to the control instruction of the system control module;
the power amplification module is used for adjusting the working mode into a bridging mode according to the control instruction of the system control module;
and the output feedback module is used for detecting the output signal level of the power amplification module and sending an output feedback signal to the system control module.
Preferably, the output feedback module includes:
the voltage dividing unit is used for attenuating the voltage output by the power amplifying module so as to output an attenuated voltage dividing signal;
and the coupling unit is used for coupling the divided voltage signal into a monitoring signal matched with the voltage range of the input interface of the system control module.
Further, the coupling unit comprises a coupling capacitor, a first amplifying triode, a second amplifying triode and a linear optocoupler; one end of the coupling capacitor is connected with the voltage division signal, and the other end of the coupling capacitor is connected with the base electrode of the first amplifying triode; the emitter of the first amplifying triode is connected with the base electrode of the second amplifying triode through a linear optocoupler, and the collector is connected to the numerical control power supply module; and the emitter of the second amplifying triode is connected to the input interface of the system control module, and the collector is grounded.
Preferably, the output feedback module includes resistors R1, R2, R3, R4, R5, R6, R7, capacitors C1, C2, C3, C4, NPN transistor Q1, PNP transistor Q2, and a linear optocoupler;
one end of R1 is connected with an output signal level end, the other end is connected with one end of R2, C1 positive electrode, C2 negative electrode is connected with C2 negative electrode, C2 positive electrode is connected with one end of R3 and R4, the other end of R3 is connected with one end of R5, R6 and R7, C3 positive electrode and feedback voltage output end of a numerical control power module, the other end of R5 is connected with a collector of Q1, a base electrode of Q1 is connected with C2 positive electrode, an emitter of Q1 is connected with an input power end of a linear optocoupler, an input reference end and an output reference end of the linear optocoupler are connected with the other end of R2 and R4 and are grounded, an output power end of the linear optocoupler is connected with the other end of R6 and a base electrode of Q2, the collector of Q2 is grounded, the emitter of Q2 is connected with the other end of R7, one end of C4 and a detection end of a system control module, and the other end of C4 and the negative electrode of C3 are grounded.
Preferably, the power supply detection module includes a voltage comparator LM393, and the power supply signal and the reference voltage are respectively connected to the reverse input end and the forward input end of the same channel, and the output end of the same channel is connected to the system control module.
The invention also proposes an audio device comprising a control circuit as claimed in any one of the preceding claims.
The beneficial effects of the invention are as follows:
1. the control method of the audio power can determine the working mode and the working voltage of the power amplification module according to the input power supply type of the circuit and the power required by the load loudspeaker so as to output the adaptive power; when the input power supply type is an external alternating current power supply, the power amplification module can be set into a bridging mode so as to improve the output power of the power amplification module; and whether the working voltage of the power amplification module needs to be further improved or not can be determined according to the output feedback signal of the output feedback module so as to further improve the output power of the power amplification module and optimize the power amplification effect so as to provide better sound effect. The invention can stage and promote the power amplification effect under the active condition, and also can prolong the battery endurance time.
2. When the input power source type is a battery, the power amplification module can output smaller power so as to improve the cruising ability of the battery; when the input power type is changed from an external alternating current power supply to a battery power supply, the system control module can gradually reduce the working voltage of the power amplification module so as to avoid noise and abrupt change of audio effect caused by power supply switching.
3. The output feedback module in the audio power control circuit reduces the output signal level of the power amplification module through the voltage division unit, and isolates the direct current signal through the coupling unit, so that the monitoring precision can be improved, and the higher signal level with interference output by the power amplification module is adjusted to be a high-precision low-voltage signal matched with the system control module.
4. The power amplification module in the audio power control circuit can be expanded to comprise a multi-stage power amplification unit and can also be expanded to receive multiple paths of audio inputs; when the system is applied to audio equipment, the system can be compatible with various audio input modes, can realize multi-stage amplification of audio signals through the system control module, and has wide adaptation range.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a flow chart of a first embodiment of a control method of the present invention;
FIG. 2 is a schematic flow chart of a preferred embodiment of the control method of the present invention;
FIG. 3 is a schematic diagram of the module connection of an embodiment of the control circuit according to the present invention;
FIG. 4 is a schematic diagram of a circuit embodiment of the output feedback module according to the present invention;
FIG. 5 is a schematic diagram of a circuit embodiment of a power detection module according to the present invention;
fig. 6 is a schematic diagram of an embodiment of an audio device according to the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In a first embodiment shown in fig. 1, in combination with the module connection schematic diagram shown in fig. 3, the present invention proposes a method for controlling audio power, which includes the following steps:
s10: the power supply detection module 1 detects the type of input power supply and sends a detection signal to the system control module 2; the input power supply type comprises an external alternating current power supply and a battery power supply;
s20: the system control module 2 judges the input power supply type as an external alternating current power supply according to the detection signal, and controls the power amplification module 4 to work in a bridging mode;
s30: the output feedback module 5 detects the output signal level and sends an output feedback signal to the system control module 2;
s40: when the system control module 2 judges that the output feedback signal is larger than the set value, the numerical control power supply module 3 is controlled to gradually increase the working voltage of the power amplification module 4 to a preset first working voltage.
The external alternating current power supply can be a civil 220V alternating current power supply or a 110V alternating current power supply, and can also be a high-capacity alternating current storage battery power supply. When the power detection module 1 judges that the input power type is an external alternating current power supply, the system control module 2 judges that the power amplification module 4 can work at a larger working voltage so as to improve the power amplification effect of the audio; therefore, the system control module 2 outputs a power amplifier control signal to the power amplifier module 4, so that the power amplifier module 4 operates in the bridge mode. The bridge mode of the power amplification module is to output the amplification circuits of the two audio channels to a group of speakers at the same time so as to improve the audio undistorted output voltage value of the power amplifier, thereby improving the power of the power amplifier.
While the power amplification module 4 works in the bridge mode, the output feedback module 5 detects the output signal level of the power amplification module 4 in real time so as to monitor the output power of the power amplification module 4 and send the output feedback signal to the system control module 2; the system control module 2 continues to judge whether the output feedback signal is larger than a set value, if so, the output power of the power amplifying circuit is larger, and the output voltage of the numerical control power supply module 3 can be further improved to ensure the working voltage of the power amplifying module 4; therefore, the system control module 2 outputs a power control signal to the nc power module 3 to step up the output voltage of the nc power module 3. The higher the output voltage of the numerical control power supply module 3 is, the larger the output power of the power amplification module 4 is, and the output signal level detected by the output feedback module 5 is correspondingly improved; when the numerical control power supply module 3 is judged to reach the preset maximum output voltage, the output voltage can be stopped from being increased, the working voltage of the power amplification module 4 is kept to be the preset first working voltage, so that the power amplification module 4 outputs a stable high-power amplification signal, and the amplification effect of audio power is improved.
The set value of the output feedback signal can be set according to the actual circuit parameters of the power amplification module 4, can also be set according to the rated voltage and other parameters of the numerical control power supply module 3, and can also be selected in combination with the setting of the output feedback module 5. The preset first working voltage may be the maximum output voltage value of the digitally controlled power module 3, or may be a voltage value lower than the maximum output voltage, so as to prolong the service life of the digitally controlled power module 3.
In another embodiment of the present invention, when the system control module 2 determines that the input power type is battery power according to the detection signal, the power amplification module 4 can be controlled to operate in the single power amplifier mode to save the power consumption of the power amplification module to the maximum extent, and the output voltage of the nc power module 3 (i.e. the operating voltage of the power amplification module 4) can be preset to be the fourth operating voltage. Of course, the working voltage or working current of the power amplifier in the power amplifying module 4 can be reduced, so as to reduce the power consumption of each power amplifier, and further reduce the overall power consumption of the power amplifying module 4.
To ensure continuous playback of audio, the input power types may be switched. When the input power supply is switched from a battery power supply to an external alternating current power supply, the output voltage of the numerical control power supply module 3 can be gradually increased, so that the working voltage of the power amplification module is increased, and the power amplification effect is improved; meanwhile, the battery power supply can be charged. When the system control module 2 judges that the input power type is changed from an external alternating current power supply to a battery power supply according to the detection signal, the power consumption of the power amplification module 4 needs to be reduced as soon as possible, so that the battery power supply is prevented from being exhausted in a short time; meanwhile, in order to give consideration to abrupt change of audio sound effect, the system control module 2 in the invention controls the numerical control power supply module 3 to gradually reduce the working voltage of the power amplification module 4 so as to gradually reduce the output power of the power amplification module.
In another embodiment of the present invention, the controlling the digitally controlled power module 3 to gradually reduce the operating voltage of the power amplifying module 4 may specifically include the following two steps:
the numerical control power supply module is controlled to gradually reduce the current working voltage to a preset second working voltage;
the control power amplification module 4 is converted from a bridge mode to a single power amplifier mode.
In the first embodiment of the present invention, when the input power source type is the external ac power source, the power amplifying module 4 works in the bridge mode, and the numerical control power module 3 sets the working voltage of the power amplifying module 4 to the preset first working voltage; if the current operating voltage is the first operating voltage, and the input power type is switched to the battery power, the nc power module 3 outputs the fourth operating voltage, and at this time, the operating voltage of the power amplifying module 4 is reduced from the first operating voltage to the fourth operating voltage. In order to avoid the abrupt change of the sound effect caused by the abrupt change of the voltage, the present working voltage is gradually reduced to the preset second working voltage, and then the power amplifying module 4 working in the bridge mode is switched to the single power amplifier mode, so that the gradual transition of the sound effect is realized, and the instant discharge of the battery power supply is not excessively large. The second operating voltage may be greater than the fourth operating voltage, and when the power amplifying module 4 is switched to the single power amplifier mode, the output voltage of the digitally controlled power module 3 may be gradually reduced again until the fourth operating voltage, and the fourth operating voltage may be kept continuously supplied.
The step-down voltage value may be preset, for example, by gradually decreasing the current operating voltage to a preset second operating voltage: presetting a voltage value of which the preset amplitude is reduced each time so as to gradually reduce the output voltage of the numerical control power supply module 3 in an arithmetic progression; or, each time, taking the voltage value of the preset percentage of the current working voltage as the next working voltage, so that the output voltage of the numerical control power supply module 3 is gradually reduced in an equal ratio array; or, reducing the output voltage in combination with the preset time.
In another embodiment of the present invention, the system control module 2 may gradually decrease the output voltage of the nc power module 3 according to the signal fed back by the output feedback module 5, specifically: the controlling the digital control power module 3 to gradually reduce the current working voltage to a preset second working voltage includes:
acquiring the current working voltage of the numerical control power supply module 3;
multiplying the current operating voltage by 95% to obtain the next operating voltage;
judging whether the next working voltage is smaller than a preset second working voltage, if so, controlling the numerical control power supply module 3 to reduce the current working voltage to the preset second working voltage; otherwise, receiving the output signal level detected by the output feedback module 5, and multiplying the output signal level by 98% to be used as a threshold value;
controlling the numerical control power supply module 3 to reduce the current working voltage to the next working voltage;
and receiving the output signal level detected by the output feedback module 5, and when the received current output signal level is smaller than a threshold value, taking the next working voltage as the current working voltage, and returning to the step of multiplying the current working voltage by 95% to obtain the next working voltage.
Because the level change trend detected by the output feedback module 5 can lag behind the output voltage change trend of the numerical control power supply module 3, the embodiment can detect the level reduction amplitude of the output signal of the power amplification module 4 in real time through the output feedback module 5, and determine whether the output voltage of the numerical control power supply module 3 needs to be continuously and gradually regulated down; the percentage values in this embodiment may be set according to the circumstances, and are not limited to the specific percentage values described above.
When the system control module 2 determines that the input power type is an external ac power supply and the output feedback signal fed back by the output feedback module 5 is smaller than the set value, it indicates that the output power of the power amplifying circuit is smaller, and the output voltage of the numerical control power module 3 does not need to be increased to the first working voltage, so the invention further provides an embodiment, which is shown in fig. 2: the digitally controlled power module 3 is controlled to set the operating voltage of the power amplifying module 4 to a third operating voltage. The third working voltage is a set voltage when the external ac power supply supplies power and the power amplifying module 4 works in the bridge mode, and may be greater than the fourth working voltage and less than the first working voltage, or may be greater than or equal to the second working voltage, preferably may be half of the first working voltage.
Based on the embodiments of the control method for audio power, the present invention also proposes a preferred embodiment shown in fig. 2, which specifically includes the following steps:
s10: the power supply detection module detects the type of an input power supply;
s20: the system control module judges whether the input power supply type is an external alternating current power supply, if yes, the S31 is executed, and if not, the S32 is executed;
s31: the power amplification module works in a bridging mode and continues to execute the step S40;
s32: setting the power amplification module to a single power amplifier mode;
s40: the system control module judges whether the output feedback signal is larger than a set value, if so, the S51 is executed, and if not, the S52 is executed;
s51: the numerical control power supply module gradually increases the working voltage of the power amplifying module to a preset first working voltage;
s52: and the numerical control power supply module outputs a third working voltage.
According to the invention, the input power type is detected through the power detection module 1, so that the output voltage of the numerical control power module 3 is controlled through the system control module 2, and therefore, the whole circuit outputs smaller power amplifier power in a battery power supply mode, and the duration of a battery is prolonged; when the external alternating current power supply supplies power, the power amplification module 4 can be set to increase the power amplification power in a bridging mode, and whether the output voltage of the numerical control power supply module 3 needs to be further increased or not is judged according to the output level signal of the power amplification module 4, so that the power amplification power is further increased, and the power amplification effect is enhanced.
The invention also proposes a control circuit for audio power, as in the embodiment shown in fig. 3, comprising:
the power supply detection module 1 is used for detecting an input power supply type, sending detection signals to the system control module, wherein the input power supply type comprises an external alternating current power supply and a battery power supply;
the system control module 2 is used for judging the input power supply type as an external alternating current power supply according to the detection signal, controlling the power amplification module to work in a bridging mode, judging that the output feedback signal is larger than a set value, and controlling the numerical control power supply module to increase the working voltage of the power amplification module to a preset first working voltage;
the numerical control power supply module 3 is used for outputting the working voltage of the power amplifying module 4 according to the control instruction of the system control module;
the power amplification module 4 is used for adjusting the working mode into a bridging mode according to the control instruction of the system control module;
and the output feedback module 5 is used for detecting the output signal level of the power amplification module 4 and sending an output feedback signal to the system control module 2.
When the input power type detected by the power detection module 1 is an external alternating current power supply, the system control module 2 outputs a control instruction of a power control signal to the numerical control power supply module 3, so that the numerical control power supply module 3 outputs a preset output voltage, and simultaneously outputs a control instruction of a power amplification control signal to the power amplification module 4, so that the power amplification module 4 works in a bridging mode, and the output power of the power amplification module is improved; meanwhile, the output feedback module 5 can detect the output signal level in real time so as to monitor the output power of the power amplification module 4, and send the output feedback signal to the system control module 2, and the system control module 2 judges whether the output voltage of the numerical control power supply module 3 needs to be further improved; if the output voltage of the nc power module 3 needs to be further increased, the system control module 2 outputs a power control signal to the nc power module 3 again, so that the nc power module 3 increases the working voltage of the power amplifying module 4. The higher the output voltage of the numerical control power supply module 3 is, the larger the output power of the power amplification module 4 is, and the output feedback signal detected by the output feedback module 5 is correspondingly improved; when the output feedback signal reaches a preset maximum value or the output voltage of the numerical control power supply module 3 reaches the preset maximum value, the system control module 2 keeps the power amplification voltage output by the numerical control power supply module 3 at the current first working voltage so that the power amplification module 4 outputs a stable high-power amplification signal; therefore, the audio power control circuit can automatically adjust the output power of the power amplification module 4 according to different input power sources so as to meet different requirements of battery power supply and external alternating current power supply.
Referring to the embodiment shown in fig. 4, the output feedback module 5 in the control circuit of the present invention may include:
a voltage dividing unit 51 for attenuating the voltage output from the power amplifying module to output an attenuated divided voltage signal;
and a coupling unit 52, configured to couple the divided voltage signal to a monitor signal that matches the input interface voltage range of the system control module.
The output feedback signal of the power amplification module 4 can be connected to a point D in fig. 4, and after voltage division and attenuation, the point E is connected to a corresponding port of the system control module 2, so as to reduce the output voltage of the output feedback module 5 to a range that can be recognized by the system control module 2; if the power amplification module 4 includes two paths of amplifying output units, the output ends of the two paths of amplifying output units may be respectively connected to the circuits of fig. 4, so as to respectively obtain output feedback signals of the two paths of amplifying output units.
The voltage dividing unit 51 may be implemented by a plurality of voltage dividing resistors connected in series, the coupling unit may be implemented by a coupling capacitor, and in order to improve the measurement accuracy of the output feedback signal, the invention proposes a specific circuit shown in fig. 4, where the voltage dividing unit 51 is implemented by two resistors R1 and R2 connected in series, and the voltage dividing signal is led out from between the two resistors; the coupling unit 52 includes a coupling capacitor (in the illustrated embodiment, the coupling capacitor is composed of two coupling capacitors C1 and C2 connected in series), a first amplifying transistor Q1, a second amplifying transistor Q2, and a linear optocoupler F; one end of the coupling capacitor is connected with the led out voltage division signal, and the other end of the coupling capacitor is connected with the base electrode of the first amplifying triode Q1; the emitter of the first amplifying triode Q1 is connected with the base of the second amplifying triode Q2 through a linear optocoupler F, and the collector is connected to the numerical control power supply module; the emitter of the second amplifying triode Q2 is connected to the input interface of the system control module 2, and the collector is grounded.
Referring to the specific circuit embodiment shown in fig. 4, the present invention further proposes a control circuit for audio power, including: the system comprises a power detection module 1, a system control module 2, a numerical control power module 3, a power amplification module 4 and an output feedback module 5; the output end of the power supply detection module 1 is connected with the detection end of the system control module 2, and the control power supply end of the system control module 2 is connected with the control input end of the numerical control power supply module 3; the power amplifier control end of the system control module 2 is connected with the power amplifier module 4, the power amplifier voltage output end of the numerical control power module 3 is connected with the power input point of the power amplifier module 4, the output level end of the power amplifier module 4 is connected with the input end of the output feedback module 5, and the output end of the output feedback module 5 is connected with the system control module 2; wherein,
the output feedback module comprises resistors R1, R2, R3, R4, R5, R6 and R7, capacitors C1, C2, C3 and C4, an NPN triode Q1 (serving as a first amplifying triode Q1), a PNP triode Q2 (serving as a second amplifying triode Q2) and a linear optocoupler; one end of R1 is connected with an output signal level end, the other end is connected with one end of R2, C1 positive electrode, C2 negative electrode is connected with C2 negative electrode, C2 positive electrode is connected with one end of R3 and R4, the other end of R3 is connected with one end of R5, R6 and R7, C3 positive electrode and feedback voltage output end of numerical control power module 3, the other end of R5 is connected with the collector of Q1, the base of Q1 is connected with C2 positive electrode, the emitter of Q1 is connected with the input power end of a linear optocoupler, the input reference end and the output reference end of the linear optocoupler are connected with the other end of R2 and R4 and are grounded, the output power end of the linear optocoupler is connected with the other end of R6 and the base of Q2, the collector of Q2 is grounded, the emitter of Q2 is connected with the other end of R7, one end of C4 and the detection end of system control module 2, and the other end of C4 and the negative electrode of C3 are grounded.
The output signal level end is the signal output end level of the power amplification module, and is reduced after being divided by R1 and R2 so as to be convenient for subsequent isolation and amplification treatment; the capacitors C1, C2 and C3 can be high-capacity electrolytic capacitors, and the capacitor C4 can be a low-capacity capacitor without positive and negative electrodes; the feedback voltage output end of the numerical control power supply module 3 is used for providing working voltage for the signal detection module 5, and the detection end of the system control module 2 is used for receiving the feedback signal processed by the output feedback module 5. The control circuit adopting the structure can enable the level output by the power amplification module 4 to be attenuated after being divided and then to be isolated by the linear optocoupler, so that the problem of accurately detecting the feedback signal can be solved.
In this embodiment, the signals of the first amplifying triode Q1 and the second amplifying triode Q2 are isolated by the linear optocoupler F, so that the high voltage output by the power amplifying module 4 is isolated from the circuit of the microprocessor connected to the system control module 2, and the functions of protecting and improving the detection precision are achieved. After the output feedback signal passes through a voltage dividing circuit formed by a resistor R1 and a resistor R2, the level of the output signal is reduced and attenuated, the interference of a direct current signal is eliminated after passing through a capacitor C1/C2, the output feedback signal is coupled to an amplifying circuit formed by a first amplifying triode Q1, a linear optocoupler is driven to work, the resistance value of the linear optocoupler is linearly reduced along with the increase of the emitter current of the first amplifying triode Q1, so that the base current of a second amplifying triode Q2 is changed, the emitter current of the second amplifying triode Q2 is correspondingly changed, the output voltage of an E point is also changed along with the change, and the changed voltage is output to a corresponding interface in a system control module 2, so that the output feedback signal of each amplifying output unit in a power amplifying module 4 is obtained.
The power detection module 1 of the present invention may employ the voltage comparator LM393 as a core element of the detection circuit. When no external alternating current power supply exists, the input power supply signal is lower than the reference voltage (the reference voltage can be set to be 2.5V), the output of the voltage comparator LM393 is high level, at the moment, the whole circuit works in a low power mode, the power amplification module 4 is in a non-bridging state, and the numerical control power supply module 3 outputs low voltage; conversely, when the external ac power is supplied, the input power signal is higher than the reference voltage, and the output of the voltage comparator LM393 is at a low level; at this time, the system control module 2 controls the power amplifying module 4 to switch to the bridge mode, and controls the output voltage of the nc power supply module 3 to rise to the first operating voltage according to the output feedback signal. The specific circuit can be as shown in fig. 5: the power supply signal and the reference voltage are respectively connected into a reverse input end A and a forward input end B of the same channel, the magnitude of the power supply signal and the reference voltage can be obtained through the voltage comparison result of the reverse input end A and the forward input end B, so that the power supply signal is judged to be an external alternating current power supply or a battery power supply, and the judgment result is connected into the system control module 2 through a point C. The voltage comparator LM393 is a dual channel voltage comparison, and may further extend other voltage comparison functions.
In the output feedback module and the power supply detection module shown in fig. 4 and fig. 5, if r1=9.1k, r2=1k, c1=c2=100deg.F, the linear optocoupler is LCR0202, and when the battery supplies power through the circuit, the output power of the power amplification module 4 can be only 1/16 of the output power of the external ac power supply, thereby greatly prolonging the endurance of the battery and increasing the playing time of the battery supply; when an alternating current power supply is externally connected, the output power of the circuit can be adjusted to be 16 times of the power supplied by the battery. Of course, the output power multiples of the battery power supply and the external ac power supply in the present invention may be designed in other multiple relationships according to the specific parameters in the circuit, the chip selection of the digitally controlled power module 3, and the design of the power amplification module 4, and are not limited to 16 times as described in the present example.
According to the above control method and control circuit of audio power, the present invention also proposes an audio device comprising any one of the control circuits.
As shown in fig. 6, in an embodiment of the audio device according to the present invention, the power amplification module may include a first power amplification unit 41 and a second power amplification unit 42 to amplify multi-channel audio respectively, and an output control unit 43 capable of controlling bridging between the first power amplification unit 41 and the second power amplification unit 42, so as to adjust the first power amplification unit 41 and the second power amplification unit 42 to a bridging mode when the input power type is external ac power, and increase the output power of the power amplification module 4.
The control circuit may further comprise an audio signal processing module 6 for receiving audio signals, the output of the audio signal processing module 6 being connected to the input of the power amplifying module 4 for amplifying the received audio signals and broadcasting them through a speaker system 7. The power amplification module 4 may further include a circuit protection unit 44 for protecting the circuit from overload or short circuit to automatically turn off the power amplification module 4 when an abnormality occurs in the circuit.
The control circuit may further comprise an input switching module 8 for switching multiple input audio frequencies, and an output end of the input switching module 8 is connected to an input end of the audio signal processing module 6. The input switching module 8 may include an analog input unit 81 for receiving an external analog audio signal, a coaxial/fiber optic input unit 82 for receiving a coaxial or fiber optic audio signal, a bluetooth/WIFI input unit 83 for receiving a bluetooth or WIFI audio signal, an intelligent voice input unit 84 for receiving an external voice input, and the like.
The control circuit of the present invention may further include a battery module 12 for supplying battery power to the system control module 2, a charging module 11 for charging the battery module 12; the charging module 11 is also connected with an alternating current-direct current conversion module 13 and is connected with the system control module 2 through the power supply detection module 1. When the control circuit of the invention is externally connected with an alternating current power supply, the battery module 12 can be charged, and when the external alternating current power supply is lost, the battery module 12 directly supplies power to the system control module 2. The system control module 2 may also be connected with a power indication module 91 for indicating the type of the input power and an audio signal indication module 92 for prompting the audio input source.
The control method, the control circuit and the audio equipment can boost the output voltage through the numerical control power supply module 3 or bridge the power amplifying units in the power amplifying module 4 so as to improve the output power of the power amplifying module 4, and can change the output power by combining the two modes. Meanwhile, the power supply detection module 1 and the output feedback module 5 are further arranged in the circuit for detecting the input power supply type and the output level state of the power amplification module 4 in real time, and automatically controlling and changing the output power according to the detection result.
Through this patent circuit, during battery power supply, power amplifier output only is 1/16 of maximum power, very big extension battery's duration increases battery power supply broadcast time, and when external power supply, this patent circuit can output battery power supply's maximum 16 output, provides powerful output, has taken into account battery power supply's continuous broadcast time well, and when external power supply, through improving output, realizes good audio.
The foregoing is only a partial embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (9)
1. A method for controlling audio power, comprising:
the power supply detection module detects the type of an input power supply and sends a detection signal to the system control module; the input power supply type comprises an external alternating current power supply and a battery power supply;
the system control module judges the type of the input power supply as a battery power supply according to the detection signal and controls the power amplification module to work in a single-power amplifier mode;
the system control module judges the type of the input power supply as an external alternating current power supply according to the detection signal and controls the power amplification module to work in a bridging mode;
the output feedback module detects the output signal level and sends an output feedback signal to the system control module;
the system control module judges that the output feedback signal is larger than a set value, and controls the numerical control power supply module to increase the working voltage of the power amplification module to a preset first working voltage.
2. The control method according to claim 1, wherein the power detection module detects an input power type, and further comprises, after transmitting a detection signal to the system control module:
and when the system control module judges that the input power type is changed from an external alternating current power supply to a battery power supply according to the detection signal, the numerical control power supply module is controlled to gradually reduce the working voltage of the power amplification module.
3. The control method according to claim 2, wherein the controlling the digitally controlled power module to step down the operating voltage of the power amplification module includes:
the numerical control power supply module is controlled to gradually reduce the current working voltage to a preset second working voltage;
the control power amplification module is converted from a bridge mode to a single power amplifier mode.
4. The control method according to claim 3, wherein the controlling the digitally controlled power module to gradually decrease the current operating voltage to a preset second operating voltage includes:
acquiring the current working voltage of the numerical control power supply module;
multiplying the current operating voltage by 95% to obtain the next operating voltage;
judging whether the next working voltage is smaller than a preset second working voltage, if so, controlling the numerical control power supply module to reduce the current working voltage to the preset second working voltage; otherwise, receiving the output signal level detected by the output feedback module, and multiplying the output signal level by 98% to be used as a threshold value;
controlling the numerical control power supply module to reduce the current working voltage to the next working voltage;
and receiving the output signal level detected by the output feedback module, and when the received current output signal level is smaller than a threshold value, taking the next working voltage as the current working voltage, and returning to the step of multiplying the current working voltage by 95% to obtain the next working voltage.
5. The control method according to claim 1, wherein the output feedback module detects an output signal level, and further comprising, after transmitting the output feedback signal to the system control module:
the system control module judges that the output feedback signal is smaller than the set value, and controls the numerical control power supply module to set the working voltage of the power amplification module to be a third working voltage.
6. A control circuit for audio power, comprising:
the power supply detection module is used for detecting the type of an input power supply, sending detection signals to the system control module, wherein the type of the input power supply comprises an external alternating current power supply and a battery power supply;
the system control module is used for judging the type of the input power supply as an external alternating current power supply according to the detection signal, controlling the power amplification module to work in a bridging mode, judging that the output feedback signal is larger than a set value, and controlling the numerical control power supply module to increase the working voltage of the power amplification module to a preset first working voltage;
the system control module is also used for judging the type of the input power supply to be a battery power supply according to the detection signal and controlling the power amplification module to work in a single power amplifier mode;
the numerical control power supply module is used for outputting the working voltage of the power amplifying module according to the control instruction of the system control module;
the power amplification module is used for adjusting the working mode into a bridging mode according to the control instruction of the system control module;
and the output feedback module is used for detecting the output signal level of the power amplification module and sending an output feedback signal to the system control module.
7. The control circuit of claim 6, wherein the output feedback module comprises:
the voltage dividing unit is used for attenuating the voltage output by the power amplifying module so as to output an attenuated voltage dividing signal;
and the coupling unit is used for coupling the divided voltage signal into a monitoring signal matched with the voltage range of the input interface of the system control module.
8. The control circuit of claim 6, wherein the output feedback module comprises resistors R1, R2, R3, R4, R5, R6, R7, capacitors C1, C2, C3, C4, NPN transistor Q1, PNP transistor Q2, and a linear optocoupler;
one end of R1 is connected with an output signal level end, the other end is connected with one end of R2, C1 positive electrode, C2 negative electrode is connected with C2 negative electrode, C2 positive electrode is connected with one end of R3 and R4, the other end of R3 is connected with one end of R5, R6 and R7, C3 positive electrode and feedback voltage output end of a numerical control power module, the other end of R5 is connected with a collector of Q1, a base electrode of Q1 is connected with C2 positive electrode, an emitter of Q1 is connected with an input power end of a linear optocoupler, an input reference end and an output reference end of the linear optocoupler are connected with the other end of R2 and R4 and are grounded, an output power end of the linear optocoupler is connected with the other end of R6 and a base electrode of Q2, the collector of Q2 is grounded, the emitter of Q2 is connected with the other end of R7, one end of C4 and a detection end of a system control module, and the other end of C4 and the negative electrode of C3 are grounded.
9. An audio device characterized in that it comprises a control circuit as claimed in any one of claims 6-8.
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