CN216253227U - Audio power supply circuit structure - Google Patents
Audio power supply circuit structure Download PDFInfo
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- CN216253227U CN216253227U CN202122572588.6U CN202122572588U CN216253227U CN 216253227 U CN216253227 U CN 216253227U CN 202122572588 U CN202122572588 U CN 202122572588U CN 216253227 U CN216253227 U CN 216253227U
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Abstract
The utility model discloses an audio power circuit structure which comprises a direct-current power supply, a boost conversion module, a feedback module and an audio signal conditioning module, wherein the direct-current power supply, the boost conversion module, the feedback module and the audio signal conditioning module are sequentially electrically connected to form a branch circuit, and the feedback module is also electrically connected with the boost conversion module to form a feedback branch circuit of the boost conversion module; the automatic switching module is used for controlling the feedback module to work or not work; the output end of the boost conversion module is used for being electrically connected with the audio power amplifier, and the input end of the audio signal conditioning module is used for inputting audio signals. The utility model solves the problems that the on-off of the feedback branch of the boost conversion module is difficult to control according to the voltage condition, the on-off switching is difficult to realize conveniently, the circuit complexity and the volume are reduced, and the like in the prior art.
Description
Technical Field
The utility model relates to the technical field of audio power amplification, in particular to an audio power circuit structure.
Background
In modern audio power amplifier systems, the efficiency of the power supply is of great concern for the purpose of energy conservation because people are in green sustainable development. In addition, in the wireless audio power amplifier system, because easily carry, convenient to use receives consumer's favor, and battery duration, because the user experience of wireless audio amplifier is directly influenced, therefore power efficiency is an important index that the consumer pays close attention to always.
When a lithium battery or other low-voltage equipment is used as a power supply, the voltage of the battery needs to be boosted by the boost conversion module to supply power to the power amplifier, and the setting of the power supply voltage of the power amplifier needs to be balanced between the audio quality and the system power consumption, because if the voltage setting is too low and the peak power is high, the top-lacking distortion of an audio signal can be caused, and the tone quality is influenced; if the voltage setting is too high, excessive losses may result when the peak power is low. In order to reduce system loss and prolong the endurance time of the battery on the premise of ensuring tone quality, the idea of adding feedback to the boost conversion module can be adopted, however, the difficult problems are how to control the on-off of the feedback branch circuit according to the voltage condition, how to conveniently realize on-off switching, and how to reduce the circuit complexity and the size.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model provides an audio power circuit structure, which solves the problems that the switching on and off of a feedback branch of a boost conversion module is difficult to control according to the voltage condition, the switching on and off is difficult to realize conveniently, the complexity and the volume of a circuit are reduced, and the like in the prior art.
The technical scheme adopted by the utility model for solving the problems is as follows:
an audio power circuit structure comprises a direct current power supply, a boost conversion module, a feedback module and an audio signal conditioning module, wherein the direct current power supply, the boost conversion module, the feedback module and the audio signal conditioning module are sequentially electrically connected to form a branch circuit, and the feedback module is also electrically connected with the boost conversion module to form a feedback branch circuit of the boost conversion module; the automatic switching module is used for controlling the feedback module to work or not work; the output end of the boost conversion module is used for being electrically connected with the audio power amplifier, and the input end of the audio signal conditioning module is used for inputting audio signals.
Due to the existence of the feedback module and the audio signal conditioning module, the boost conversion module can be used for converting the boost signal into the audio signal. The output voltage of the boost conversion module can be automatically adjusted according to the amplitude of the input audio, namely when the input audio signal rises, the output voltage of the boost conversion module rises; when the signal falls back, the output voltage of the boost conversion module is reduced, so that the power loss of the system can be reduced on the premise of ensuring the tone quality, the endurance time of a battery or other power supply equipment is prolonged, and the energy waste is reduced. The self-switching module is used for controlling the feedback module to work or not work, and the feedback branch is cut off when the feedback module does not work, so that the switching is convenient and fast; meanwhile, the feedback module can be controlled to work or not work by adopting the self-switching module, the circuit complexity is low, and the occupied space and the volume of the circuit module are reduced. Therefore, the problems that the prior art is difficult to control the on-off of the feedback branch of the boost conversion module according to the voltage condition, the on-off switching is difficult to realize conveniently, the circuit complexity and the size are reduced and the like are solved.
As a preferred technical solution, the dc power supply, the self-switching module, the audio signal conditioning module, and the feedback module are electrically connected in sequence to form another branch.
The self-switch module controls the feedback module to work or not work by controlling the audio signal conditioning module, so that the control is more convenient; and the output of the direct current power supply is used as the working voltage, so that the size is further reduced.
As a preferable technical solution, the self-switching module includes an NPN-type transistor Q1, a resistor R8, and a zener diode DZ1, a base of the transistor Q1 is grounded via the zener diode DZ1, a collector of the transistor Q1 is electrically connected to the dc power supply, an emitter of the transistor Q1 is electrically connected to the audio signal conditioning module, one end of the resistor R8 is electrically connected to the collector of the transistor Q1, and the other end of the resistor R8 is electrically connected to the base of the transistor Q1.
The circuit structure has the advantages of fewer electronic elements, simple structure, convenience in control and small occupied space.
As a preferred technical scheme, the feedback module includes an MOS transistor, a gate of the MOS transistor is electrically connected to the audio signal conditioning module, and a drain of the MOS transistor is electrically connected to the boost conversion module to form a feedback branch of the boost conversion module.
The voltage division function can be better realized by utilizing the variable resistance characteristic of the MOS tube.
As a preferred technical solution, the audio signal conditioning module includes a sound channel amplifying module, a peak signal detecting circuit, and a feedback amplifier, which are electrically connected in sequence, wherein the sound channel amplifier is used for inputting and amplifying an audio signal, and the feedback amplifier is electrically connected to the feedback module.
This facilitates amplification, detection, processing of the input audio signal and automatic adjustment of the output voltage of the feedback amplifier in accordance with the magnitude of the audio signal.
As a preferred technical solution, the sound channel amplifying module includes a follower, a left sound channel amplifier, and a right sound channel amplifier, an input end of the left sound channel amplifier is used to input a left sound channel audio signal, an input end of the right sound channel amplifier is used to input a right sound channel audio signal, an output end of the left sound channel amplifier and an output end of the right sound channel amplifier are respectively electrically connected to an input end of the follower, and an output end of the follower is electrically connected to the peak signal detecting circuit.
This facilitates the amplification, detection, processing of the left and right channel audio signals and automatically adjusts the output voltage of the feedback amplifier according to the magnitude of the audio signal.
As a preferred technical solution, the left channel amplifier and the right channel amplifier both include an operational amplifier, and the left channel amplifier and the right channel amplifier constitute an in-phase amplifying circuit for respectively performing signal amplification on a left channel audio signal and a right channel audio signal.
The circuit structure is simple and convenient and is easy to realize.
As a preferred technical solution, the boost conversion module includes a chip LT3959, and the feedback module is electrically connected to an FXB pin of the chip LT3959 to form a feedback branch of the boost conversion module.
The chip LT3959 has excellent amplification performance and wide application.
As a preferred technical solution, the dc power supply is a lithium battery.
Lithium batteries are portable, easy to carry and install, and have a high stored energy density.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model is convenient and fast to switch; meanwhile, the feedback module can be controlled to work or not work by adopting the self-switching module, the circuit complexity is low, and the occupied space and the volume of the circuit module are reduced. Therefore, the problems that the prior art is difficult to control the on-off of the feedback branch of the boost conversion module according to the voltage condition, the on-off switching is difficult to realize conveniently, the circuit complexity and the size are reduced and the like are solved.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a first portion of a circuit configuration diagram of the present invention;
FIG. 3 is a second portion of the circuit configuration of the present invention;
FIG. 4 is a third part of the circuit configuration of the present invention;
fig. 5 is a graph of the output characteristics of the MOS transistor in example 3.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
Example 1
As shown in fig. 1 to 5, an audio power circuit structure includes a dc power supply, a boost conversion module, a feedback module, and an audio signal conditioning module, where the dc power supply, the boost conversion module, the feedback module, and the audio signal conditioning module are sequentially electrically connected to form a branch, and the feedback module is further electrically connected to the boost conversion module to form a feedback branch of the boost conversion module; the automatic switching module is used for controlling the feedback module to work or not work; the output end of the boost conversion module is used for being electrically connected with the audio power amplifier, and the input end of the audio signal conditioning module is used for inputting audio signals.
Due to the existence of the feedback module and the audio signal conditioning module, the boost conversion module can be used for converting the boost signal into the audio signal. The output voltage of the boost conversion module can be automatically adjusted according to the amplitude of the input audio, namely when the input audio signal rises, the output voltage of the boost conversion module rises; when the signal falls back, the output voltage of the boost conversion module is reduced, so that the power loss of the system can be reduced on the premise of ensuring the tone quality, the endurance time of a battery or other power supply equipment is prolonged, and the energy waste is reduced. The self-switching module is used for controlling the feedback module to work or not work, and the feedback branch is cut off when the feedback module does not work, so that the switching is convenient and fast; meanwhile, the feedback module can be controlled to work or not work by adopting the self-switching module, the circuit complexity is low, and the occupied space and the volume of the circuit module are reduced. Therefore, the problems that the prior art is difficult to control the on-off of the feedback branch of the boost conversion module according to the voltage condition, the on-off switching is difficult to realize conveniently, the circuit complexity and the size are reduced and the like are solved.
As a preferred technical solution, the dc power supply, the self-switching module, the audio signal conditioning module, and the feedback module are electrically connected in sequence to form another branch.
The self-switch module controls the feedback module to work or not work by controlling the audio signal conditioning module, so that the control is more convenient; and the output of the direct current power supply is used as the working voltage, so that the size is further reduced.
As a preferable technical solution, the self-switching module includes an NPN-type transistor Q1, a resistor R8, and a zener diode DZ1, a base of the transistor Q1 is grounded via the zener diode DZ1, a collector of the transistor Q1 is electrically connected to the dc power supply, an emitter of the transistor Q1 is electrically connected to the audio signal conditioning module, one end of the resistor R8 is electrically connected to the collector of the transistor Q1, and the other end of the resistor R8 is electrically connected to the base of the transistor Q1.
The circuit structure has the advantages of fewer electronic elements, simple structure, convenience in control and small occupied space.
As a preferred technical scheme, the feedback module includes an MOS transistor, a gate of the MOS transistor is electrically connected to the audio signal conditioning module, and a drain of the MOS transistor is electrically connected to the boost conversion module to form a feedback branch of the boost conversion module.
The voltage division function can be better realized by utilizing the variable resistance characteristic of the MOS tube.
Example 2
As shown in fig. 1 to fig. 5, as a further optimization of embodiment 1, this embodiment includes all the technical features of embodiment 1, and in addition, this embodiment further includes the following technical features:
as a preferred technical solution, the audio signal conditioning module includes a sound channel amplifying module, a peak signal detecting circuit, and a feedback amplifier, which are electrically connected in sequence, wherein the sound channel amplifier is used for inputting and amplifying an audio signal, and the feedback amplifier is electrically connected to the feedback module.
This facilitates amplification, detection, processing of the input audio signal and automatic adjustment of the output voltage of the feedback amplifier in accordance with the magnitude of the audio signal.
As a preferred technical solution, the sound channel amplifying module includes a follower, a left sound channel amplifier, and a right sound channel amplifier, an input end of the left sound channel amplifier is used to input a left sound channel audio signal, an input end of the right sound channel amplifier is used to input a right sound channel audio signal, an output end of the left sound channel amplifier and an output end of the right sound channel amplifier are respectively electrically connected to an input end of the follower, and an output end of the follower is electrically connected to the peak signal detecting circuit.
This facilitates the amplification, detection, processing of the left and right channel audio signals and automatically adjusts the output voltage of the feedback amplifier according to the magnitude of the audio signal.
As a preferred technical solution, the left channel amplifier and the right channel amplifier both include an operational amplifier, and the left channel amplifier and the right channel amplifier constitute an in-phase amplifying circuit for respectively performing signal amplification on a left channel audio signal and a right channel audio signal.
The circuit structure is simple and convenient and is easy to realize.
As a preferred technical solution, the boost conversion module includes a chip LT3959, and the feedback module is electrically connected to an FXB pin of the chip LT3959 to form a feedback branch of the boost conversion module.
The chip LT3959 has excellent amplification performance and wide application.
As a preferred technical solution, the dc power supply is a lithium battery.
Lithium batteries are portable, easy to carry and install, and have a high stored energy density.
Example 3
As shown in fig. 1 to 5, this embodiment includes all the technical features of embodiment 1 and embodiment 2, and this embodiment provides a more detailed implementation manner on the basis of embodiment 1 and embodiment 2.
If the boost conversion module outputs voltage, the boost conversion module can automatically adjust according to the input audio amplitude of the power amplifier, namely when the input audio signal rises, the output voltage of the boost conversion module rises; when the signal falls back, the output voltage of the boost conversion module is reduced, so that the power loss of the system can be reduced on the premise of ensuring the tone quality, and the endurance time of a battery or other power supply equipment is prolonged.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a main switch is connected behind the battery to control the on-off of the whole system. The main switch is divided into a boost conversion module and an audio signal conditioning part at the back, the audio signal conditioning part is controlled by a self-switching circuit, when the voltage of the battery is too low, the self-switching circuit is switched off, the audio signal part does not work, and when the voltage of the battery is higher, the audio signal conditioning part works. In the boost conversion module part of the battery, a boost chip with a voltage feedback control function is adopted, and the function can change the output voltage of the boost conversion module in real time through the voltage of a feedback pin. In the audio signal conditioning part, the audio signal input end, namely the front end signal input part of the audio power amplifying circuit, the audio signals of the left and right sound channels are respectively amplified through the amplifier, then the two paths of amplified audio signals are connected in parallel, the front and back stages of the signals are isolated for the following follower, the peak value detection is carried out on the isolated double-sound-channel aliasing signals through the peak value detection circuit, the peak value voltage value of the double-sound-channel aliasing signals is obtained, the amplifier is used for properly scaling the peak value voltage and then controlling the grid electrode of the MOS tube, so that the MOS tube works in a deep linear region, the MOS tube serves as a variable resistor, the characteristic that the resistance of the MOS tube is variable is used for connecting the MOS tube and the constant value resistor in series to divide the voltage and then integrating the divided voltage into the feedback control pin of the boost conversion module, and the function of changing the output voltage of the boost conversion module is achieved.
The utility model has the beneficial effects that: the system loss can be reduced on the premise of ensuring the tone quality, the endurance time of the battery is greatly prolonged, and the energy waste is reduced.
In the attached drawings of the specification, a position 1 is a power supply input position of the whole system, a position 2 is a system power supply switch, a triode (a position 3) is conducted after the switch is pressed down, at the moment, a voltage exists at a position 4, the voltage value of the voltage is approximately equal to the voltage at the power supply input position, and the signal peak value detection and MOS (metal oxide semiconductor) part starts to work. The position 5 is a low-power consumption synchronous boosting power supply chip, a boosting conversion module is formed by a peripheral circuit of the low-power consumption synchronous boosting power supply chip, the position 7 is an input end of the boosting conversion module, the input voltage is 1.6V-12V, the position 8 is an output end of the boosting conversion module, the output voltage range is 8V-20V, the specific voltage is determined by a peak value of an input audio signal, the linear error is lower than 1%, the position 6 is an FBX end output feedback pin of the boosting conversion module, the output voltage is subjected to voltage division through a resistor of the pin and then fed back to the chip, and the output voltage is controlled. The audio power amplifier is connected with an external loudspeaker to realize audio output. The amplifiers (position 9 and position 10) constitute in-phase amplifying circuits, which respectively amplify the positive electricity parts of the left and right sound channel audio frequencies, and the negative electricity parts are directly zero voltage. Then, the peak voltage is received together by a peak detection circuit constituted by an operational amplifier (position 11), and the peak voltage is reflected by charging and discharging the capacitor 12. Then the peak voltage is accessed from the in-phase end of the operational amplifier (position 13), the output end of the operational amplifier (position 13) is connected to the grid electrode of the MOS tube (position 14), the MOS tube (position 14) divides the voltage through a series resistor, and the divided voltage is fed back to the inverting input end of the operational amplifier (position 13). The source-drain series resistance of the MOS tube (position 14) and the amplification factor of a front-end circuit are set, so that the MOS tube (position 14) meets the working condition Ugs-Uth > > Uds of a deep linear region, the Uds value in the region is small, and the channel resistance is basically controlled only by Ugs. When Ugs is constant, Id is linear with Uds, and the region is approximated by a set of straight lines. In this case, the field effect transistor D, S corresponds to a variable resistance controlled by the voltage Ugs. The output characteristic curve of the MOS transistor is shown in fig. 5, which is an output characteristic curve of a common MOS transistor, and the appearance is only for explaining the principle of the design scheme, and is not an output curve of the actual embodiment.
At this time, if the peak value of the signal becomes large, the non-inverting input terminal of the operational amplifier (position 13) becomes large, and the output of the operational amplifier (position 13) becomes large, that is, Ugs of the MOS transistor (position 14) becomes large, and the channel resistance of the MOS transistor becomes small, as can be seen from the boosting formula Vout of LT3959 chip manual being 1.6V (1+ R2/R1), R1 in the above formula is the equivalent resistance of the MOS transistor (position 14), the resistance (position 15), the resistance (position 16) are connected in series and then connected in parallel with the resistance (position 18), and R2 in the above formula is the resistance (position 17), and at this time, the resistance of the MOS transistor decreases, so that R1 decreases, and the output voltage (position 8) of the boost conversion module increases. Conversely, when the peak value of the signal decreases, the output voltage of the boost converter module (position 8) decreases. The output voltage of the boost converter module (position 8) thus varies linearly with the audio signal peak.
It should be noted that, in this embodiment, preferably, the output voltage of the dc power supply is 1.6 to 12V, and the output voltage of the boost conversion module is 8 to 12V; when the output voltage of the direct current power supply is lower than 2.5V, the audio signal conditioning module does not work; when the audio signal conditioning module does not work, the output voltage of the boost conversion module is fixed to be 12V.
As described above, the present invention can be preferably realized.
All features disclosed in all embodiments in this specification, or all methods or process steps implicitly disclosed, may be combined and/or expanded, or substituted, in any way, except for mutually exclusive features and/or steps.
The foregoing is only a preferred embodiment of the present invention, and the present invention is not limited thereto in any way, and any simple modification, equivalent replacement and improvement made to the above embodiment within the spirit and principle of the present invention still fall within the protection scope of the present invention.
Claims (6)
1. An audio power circuit structure is characterized by comprising a direct current power supply, a boost conversion module, a feedback module and an audio signal conditioning module, wherein the direct current power supply, the boost conversion module, the feedback module and the audio signal conditioning module are sequentially electrically connected to form a branch circuit, and the feedback module is also electrically connected with the boost conversion module to form a feedback branch circuit of the boost conversion module; the automatic switching module is used for controlling the feedback module to work or not work; the output end of the boost conversion module is used for being electrically connected with the audio power amplifier, and the input end of the audio signal conditioning module is used for inputting audio signals.
2. The audio power circuit structure of claim 1, wherein said dc power supply, said self-switching module, said audio signal conditioning module, and said feedback module are electrically connected in sequence to form another branch.
3. The audio power circuit structure of claim 2, wherein said self-switching module comprises an NPN-type transistor Q1, a resistor R8, and a zener diode DZ1, wherein a base of the transistor Q1 is grounded via the zener diode DZ1, a collector of the transistor Q1 is electrically connected to said dc power supply, an emitter of the transistor Q1 is electrically connected to said audio signal conditioning module, one end of the resistor R8 is electrically connected to the collector of the transistor Q1, and the other end of the resistor R8 is electrically connected to the base of the transistor Q1.
4. The audio power circuit structure of claim 3, wherein the feedback module comprises an MOS transistor, a gate of the MOS transistor is electrically connected to the audio signal conditioning module, and a drain of the MOS transistor is electrically connected to the boost conversion module to form a feedback branch of the boost conversion module.
5. The audio power circuit structure of claim 4, wherein the audio signal conditioning module comprises a sound channel amplifying module, a peak signal detecting circuit, and a feedback amplifier, which are electrically connected in sequence, the sound channel amplifying module is configured to input and amplify an audio signal, and the feedback amplifier is electrically connected to the feedback module.
6. The audio power circuit structure of claim 5, wherein the channel amplifying module includes a follower, a left channel amplifier, and a right channel amplifier, an input terminal of the left channel amplifier is used for inputting a left channel audio signal, an input terminal of the right channel amplifier is used for inputting a right channel audio signal, an output terminal of the left channel amplifier and an output terminal of the right channel amplifier are electrically connected to an input terminal of the follower, respectively, and an output terminal of the follower is electrically connected to the peak signal detecting circuit.
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| CN202122572588.6U CN216253227U (en) | 2021-10-25 | 2021-10-25 | Audio power supply circuit structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114025285A (en) * | 2021-10-25 | 2022-02-08 | 成都信息工程大学 | High-efficient audio power |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114025285A (en) * | 2021-10-25 | 2022-02-08 | 成都信息工程大学 | High-efficient audio power |
| CN114025285B (en) * | 2021-10-25 | 2023-09-15 | 成都信息工程大学 | High-efficiency audio power supply |
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Effective date of registration: 20230908 Address after: Building C, No.888, Huanhu West 2nd Road, Lingang New District, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai Patentee after: Shanghai Yichengyou Microelectronics Co.,Ltd. Address before: No.24, Xuefu Road Section 1, Southwest Airport Economic Development Zone, Shuangliu District, Chengdu, Sichuan 610225 Patentee before: CHENGDU University OF INFORMATION TECHNOLOGY |
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