CN212726950U - Power amplification circuit and device of voice chip and elevator - Google Patents
Power amplification circuit and device of voice chip and elevator Download PDFInfo
- Publication number
- CN212726950U CN212726950U CN202021675866.XU CN202021675866U CN212726950U CN 212726950 U CN212726950 U CN 212726950U CN 202021675866 U CN202021675866 U CN 202021675866U CN 212726950 U CN212726950 U CN 212726950U
- Authority
- CN
- China
- Prior art keywords
- resistor
- capacitor
- pwm
- voice
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model relates to a power amplification technology field discloses a power amplification circuit, device and elevator of pronunciation chip. In the technical scheme of the utility model, the power amplifying circuit of the voice chip is composed of the PWM voice output circuit, the PWM voltage reducing circuit, the power amplifying circuit and the output filter circuit which are connected in sequence, and the output filter circuit is connected with the loudspeaker; the PWM voice output circuit outputs PWM voice signals, the PWM voice signals output continuous analog quantity voice signals after voltage reduction processing, namely voltage reduction PWM voice signals, and the analog quantity voice signals are amplified by the power amplification circuit and then processed by the primary output filter circuit to drive the loudspeaker to produce sound. There is the problem that power is limited and the voice broadcast scheme is with high costs for current voice chip drive, the utility model discloses through step-down processing back output continuous analog quantity speech signal, improved drive power, and reduce the device and use, manufacturability reinforcing cost reduction.
Description
Technical Field
The utility model relates to a power amplification technical field especially relates to a power amplification circuit, device and elevator of pronunciation chip.
Background
At present, in the voice broadcast scheme in the elevator industry sedan-chair, the voice chip output signal that adopts is analog quantity usually, then carry out power amplification to the analog quantity through the pronunciation power amplifier and drive the speaker work, and this scheme is usually with higher costs, also appear another kind of PWM on the market and directly drive the voice chip of speaker work, this kind of scheme cost is lower, but receive the restriction of this kind of voice chip encapsulation, drive power is not very big usually, because the new standard in elevator industry is released, put forward higher requirement to the volume of voice broadcast, so the drive power of voice chip is required to be improved in step. Therefore, the voice chip driving power of the existing PWM direct-drive loudspeaker is limited, and the cost of the voice broadcasting scheme in the existing elevator industry is too high.
The above is only for the purpose of assisting understanding of the technical solutions of the present invention, and does not represent an admission that the above is the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides one kind, and it is with high costs to aim at solving current elevator trade voice broadcast scheme, and PWM directly drives the limited technical problem of voice chip drive power of speaker work.
In order to achieve the above object, the present invention provides a power amplifying circuit of a voice chip, which comprises a PWM voice output circuit, a PWM voltage reducing circuit, a power amplifying circuit and an output filter circuit connected in sequence, wherein the output filter circuit is connected to a speaker; wherein the content of the first and second substances,
the PWM voice output circuit is used for outputting a PWM voice signal to the PWM voltage reduction circuit;
the PWM voltage reduction circuit is used for receiving the PWM voice signal and reducing the voltage of the PWM voice signal to obtain a voltage reduction PWM voice signal;
the PWM voltage reduction circuit is also used for outputting the voltage reduction PWM voice signal to the power amplification circuit;
the power amplifying circuit is used for receiving the voltage reduction PWM voice signal and amplifying the voltage reduction PWM voice signal to obtain an amplified PWM voice signal;
the power amplifying circuit is also used for outputting the amplified PWM voice signal to the output filter circuit;
the output filter circuit is used for receiving the amplified PWM voice signal and filtering the amplified PWM voice signal to obtain a filtered PWM voice signal;
the output filter circuit is further configured to output the filtered PWM voice signal to the speaker, so that the speaker produces sound.
Optionally, the PWM voice output circuit includes a main control chip and a voice decoding chip, an asynchronous serial port output terminal of the main control chip is connected to an input terminal of the voice decoding chip, and an asynchronous serial port input terminal of the main control chip is connected to an output terminal of the voice decoding chip; wherein the content of the first and second substances,
the main control chip is used for sending a voice output signal to the voice decoding chip;
the voice decoding chip is used for decoding the voice output signal to obtain a PWM voice signal;
the voice decoding chip is also used for outputting PWM voice signals to the PWM voltage reduction circuit.
Optionally, the PWM voice output circuit further includes a first resistor, a second resistor, and a first capacitor; wherein the content of the first and second substances,
the first end of the first resistor is connected with the asynchronous serial port input end of the main control chip, the second end of the first resistor is connected with the output end of the voice decoding chip, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the power supply, the first end of the first resistor is connected with the first end of the first capacitor, and the second end of the first capacitor is grounded.
Optionally, the PWM voice output circuit further includes a third resistor, a fourth resistor, and a second capacitor; wherein the content of the first and second substances,
the first end of the fourth resistor is connected with the asynchronous serial port output end of the main control chip, the second end of the fourth resistor is connected with the input end of the voice decoding chip, the second end of the fourth resistor is connected with the first end of the second capacitor, the second end of the second capacitor is grounded, the first end of the fourth resistor is connected with the first end of the third resistor, and the second end of the third resistor is connected with the power supply.
Optionally, the PWM voltage reduction circuit includes a fifth resistor, a sixth resistor, a seventh resistor, a third capacitor, a fourth capacitor, a fifth capacitor, and a sixth capacitor; wherein the content of the first and second substances,
the first end of the fifth resistor is connected with the PWM voice output circuit, the second end of the fifth resistor is connected with the first end of the seventh resistor, the first end of the sixth resistor is connected with the PWM voice output circuit, the second end of the sixth resistor is connected with the second end of the seventh resistor, the first end of the seventh resistor is connected with the first end of the third capacitor, the second end of the third capacitor is grounded, the second end of the seventh resistor is connected with the first end of the fourth capacitor, the second end of the fourth capacitor is grounded, the first end of the third capacitor is connected with the first end of the fifth capacitor, the first end of the fourth capacitor is connected with the first end of the sixth capacitor, and the second end of the fifth capacitor is connected with the power amplification circuit, and the second end of the sixth capacitor is connected with the power amplification circuit.
Optionally, the power amplification circuit includes a power amplification chip, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, and a seventh capacitor; wherein the content of the first and second substances,
a first end of the eighth resistor is connected with the PWM step-down circuit, a second end of the eighth resistor is connected with a first end of the seventh capacitor, a first end of the ninth resistor is connected with the PWM step-down circuit, a second end of the ninth resistor is connected with a first end of the seventh capacitor, and a first end of the seventh capacitor is connected with an input end of the power amplification chip;
a first end of the tenth resistor is connected to the PWM step-down circuit, a second end of the tenth resistor is connected to a second end of the seventh capacitor, a first end of the eleventh resistor is connected to the PWM step-down circuit, a second end of the eleventh resistor is connected to a second end of the seventh capacitor, and a second end of the seventh capacitor is connected to the input terminal of the power amplifier chip.
Optionally, the power amplification circuit further includes a twelfth resistor, a thirteenth resistor, and an eighth capacitor; wherein the content of the first and second substances,
the first end of the twelfth resistor is connected with the PWM voice output circuit, the second end of the twelfth resistor is connected with the control end of the power amplification chip, the second end of the twelfth resistor is connected with the first end of the thirteenth resistor, the second end of the thirteenth resistor is grounded, the first end of the thirteenth resistor is connected with the first end of the eighth capacitor, and the second end of the eighth capacitor is grounded.
Optionally, the output filter circuit includes a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a first diode, a second diode, a third diode, and a fourth diode; wherein the content of the first and second substances,
a first end of the ninth capacitor is connected with the power amplification circuit, a second end of the ninth capacitor is grounded, a first end of the tenth capacitor is connected with the power amplification circuit, a second end of the tenth capacitor is grounded, a first end of the ninth capacitor is connected with a first end of the eleventh capacitor, a second end of the eleventh capacitor is grounded, a first end of the tenth capacitor is connected with a first end of the twelfth capacitor, and a second end of the twelfth capacitor is grounded;
the first end of the ninth capacitor is connected with the anode of the first diode and the cathode of the second diode respectively, the cathode of the first diode is connected with a power supply, the anode of the second diode is grounded, the first end of the tenth capacitor is connected with the cathode of the third diode and the anode of the fourth diode respectively, the anode of the third diode is grounded, and the cathode of the fourth diode is connected with the power supply.
In order to achieve the above object, the present invention further provides a power amplifier of a voice chip, wherein the power amplifier of the voice chip comprises the power amplifier circuit of the voice chip as described above.
In order to achieve the above object, the utility model discloses still provide an elevator, the elevator includes as above the power amplification device of pronunciation chip.
The technical proposal of the utility model is that the power amplifying circuit of the voice chip is composed of a PWM voice output circuit, a PWM voltage reducing circuit, a power amplifying circuit and an output filter circuit which are connected in sequence, and the output filter circuit is connected with a loudspeaker; the PWM voice output circuit outputs a PWM voice signal to the PWM voltage reduction circuit for voltage reduction, and the voltage reduction PWM voice signal is obtained and output to the power amplification circuit; the power amplifying circuit amplifies the voltage reduction PWM voice signal to obtain an amplified PWM voice signal and outputs the amplified PWM voice signal to the output filter circuit; the output filter circuit filters the amplified PWM voice signal to obtain a filtered PWM voice signal, and outputs the filtered PWM voice signal to the loudspeaker so as to enable the loudspeaker to sound. There is the problem that power is limited and current elevator trade voice broadcast scheme is with high costs for the voice chip drive of current PWM direct drive speaker work, the utility model discloses PWM voice output circuit output PWM speech signal steps down to PWM step-down circuit, PWM speech signal outputs step-down PWM speech signal after PWM step-down circuit handles, step-down PWM speech signal is continuous analog quantity speech signal, analog quantity speech signal passes through one-level output filter circuit after the amplification through power amplifier circuit and handles, drive speaker sound production, drive power has been improved, and reduce the device and use, the manufacturability reinforcing, cost reduction, thereby it is with high costs to have solved current elevator trade voice broadcast scheme, PWM direct drive speaker work's the limited technical problem of voice chip drive power.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a functional block diagram of an embodiment of a power amplifier circuit of a voice chip according to the present invention;
fig. 2 is a schematic diagram of a circuit structure of an embodiment of the power amplifier circuit of the voice chip of the present invention.
The reference numbers illustrate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a power amplification circuit of pronunciation chip.
Referring to fig. 1, in the embodiment of the present invention, the power amplifying circuit of the voice chip includes a PWM voice output circuit 100, a PWM voltage reducing circuit 200, a power amplifying circuit 300, and an output filter circuit 400, which are connected in sequence, where the output filter circuit 400 is connected to a speaker; wherein the content of the first and second substances,
the PWM voice output circuit 100 is configured to output a PWM voice signal to the PWM voltage reduction circuit 200. In this embodiment, the PWM voice output circuit 100 may include a main control chip and a voice decoding chip, and the main control chip may communicate with the voice decoding chip through a UART serial port, so as to control the voice decoding chip to output a PWM voice signal, and the voice playing content of the voice decoding chip is controlled by the main control chip, and the voice decoding chip outputs a differential PWM form voice, i.e., a PWM voice signal.
The PWM step-down circuit 200 is configured to receive the PWM voice signal, and step down the PWM voice signal to obtain a step-down PWM voice signal. In this embodiment, the PWM voltage-reducing circuit 200 may be a PWM voltage-reducing filter circuit, the PWM voltage-reducing circuit 200 receives a PWM voice signal, the PWM voice signal may be a set of PWM voice signal, including a PWM voice positive signal and a PWM voice negative signal, the PWM voltage-reducing circuit 200 may include a voltage-reducing circuit composed of a resistor and an RC filter circuit composed of a resistor and a capacitor, the PWM voice signal is reduced and filtered through the voltage-reducing circuit and the RC filter circuit, the voltage-reducing PWM voice signal is obtained, the PWM voltage-reducing circuit 200 may also adopt other types of voltage-reducing circuits and filter circuits, which is not limited in this embodiment.
It should be noted that, the PWM voice signal is processed by the PWM step-down circuit 200 and then outputs a step-down PWM voice signal, and the step-down PWM voice signal is a continuous analog voice signal.
The PWM step-down circuit 200 is further configured to output the step-down PWM voice signal to the power amplifying circuit 300. In this embodiment, the PWM step-down circuit 200 outputs the step-down PWM voice signal to the power amplifying circuit 300 for amplification, and the step-down PWM voice signal may be a set of step-down PWM voice signals, including a step-down PWM voice positive signal and a step-down PWM voice negative signal.
The power amplifying circuit 300 is configured to receive the step-down PWM voice signal, and amplify the step-down PWM voice signal to obtain an amplified PWM voice signal. In this embodiment, the power amplifier circuit 300 may include a power amplifier chip and a peripheral circuit of the power amplifier chip, and amplify the step-down PWM voice signal by the power amplifier chip to obtain an amplified PWM voice signal, where the amplified PWM voice signal may be a set of amplified PWM voice signals, including an amplified PWM voice positive signal and an amplified PWM voice negative signal.
The power amplifying circuit 300 is further configured to output the amplified PWM voice signal to the output filter circuit 400. In this embodiment, the power amplifier circuit 300 outputs the amplified PWM voice signal to the output filter circuit 400, and the amplified PWM voice signal may be a set of amplified PWM voice signals, including an amplified PWM voice positive signal and an amplified PWM voice negative signal.
The output filter circuit 400 is configured to receive the amplified PWM voice signal, and filter the amplified PWM voice signal to obtain a filtered PWM voice signal. In this embodiment, the PWM voice signal is processed by the PWM voltage-reducing circuit 200 and then outputs a voltage-reducing PWM voice signal, the voltage-reducing PWM voice signal is a continuous analog voice signal, and the analog voice signal is amplified by the power amplifying circuit 300 and then processed by the first-stage output filter circuit 400, so as to drive the speaker to produce sound.
The output filter circuit 400 is further configured to output the filtered PWM voice signal to the speaker, so that the speaker produces sound.
In the embodiment, the power amplifying circuit of the voice chip is composed of a PWM voice output circuit 100, a PWM voltage reducing circuit 200, a power amplifying circuit 300 and an output filter circuit 400 which are connected in sequence, and the output filter circuit 400 is connected with a speaker; the PWM voice output circuit 100 outputs a PWM voice signal to the PWM voltage reduction circuit 200 for voltage reduction, obtains a voltage reduction PWM voice signal, and outputs the voltage reduction PWM voice signal to the power amplification circuit 300; the power amplifying circuit 300 amplifies the step-down PWM voice signal to obtain an amplified PWM voice signal and outputs the amplified PWM voice signal to the output filter circuit 400; the output filter circuit 400 filters the amplified PWM voice signal to obtain a filtered PWM voice signal, and outputs the filtered PWM voice signal to the speaker so that the speaker sounds. For the voice chip drive that current PWM directly drives speaker work there is the problem that power is limited and current elevator trade voice broadcast scheme is with high costs, PWM voice output circuit 100 in this embodiment outputs PWM speech signal and steps down to PWM step-down circuit 200, PWM speech signal outputs step-down PWM speech signal after PWM step-down circuit 200 handles, step-down PWM speech signal is continuous analog quantity speech signal, analog quantity speech signal is through one-level output filter circuit 400 processing again after the amplification of power amplifier circuit 300, the drive speaker sound production, drive power has been improved, and reduce the device and use, the manufacturability reinforcing, cost reduction, thereby it is with high costs to have solved current elevator trade voice broadcast scheme, the limited technical problem of voice chip drive power of PWM speaker work directly drives.
Further, referring to fig. 2, the PWM voice output circuit 100 includes a main control chip U1 and a voice decoding chip U2, an asynchronous serial port output terminal UART _ TX of the main control chip U1 is connected to an input terminal RX of the voice decoding chip U2, and an asynchronous serial port input terminal UART _ RX of the main control chip U1 is connected to an output terminal TX of the voice decoding chip U2; wherein the content of the first and second substances,
the main control chip U1 is used for sending a voice output signal to the voice decoding chip U2;
the voice decoding chip U2 is configured to decode the voice output signal to obtain a PWM voice signal;
the voice decoding chip U2 is further configured to output a PWM voice signal to the PWM voltage reduction circuit 200.
It should be noted that the main control chip U1 may communicate with the voice decoding chip U2 through a UART serial port, the main control chip U1 sends a voice output signal to the voice decoding chip U2 through an asynchronous serial port output terminal UART _ TX, the voice decoding chip U2 decodes the voice output signal to obtain a PWM voice signal, so that the main control chip U1 controls the voice decoding chip U2 to output a PWM voice signal, the voice playing content of the voice decoding chip U2 is controlled by the main control chip U1, and the voice decoding chip U2 outputs a differential PWM voice, that is, a PWM voice signal.
It should be understood that the voice decoding chip U2 may further include a reset circuit, a clock circuit, a DAT file interface circuit, etc. (not shown), and the DAT file may be a data file or other type of file, which is not limited in this embodiment.
Specifically, a FLASH memory can be embedded in the voice decoding chip U2, so that the voice file can be erased and written in many times, the main control chip U1 does not need to store the voice file by an external SD card, port resources of the main control chip U1 can be saved, the problems of field application loss and card slot damage of the SD card are solved, and a voice program can not be directly burned into the SD card through a terminal such as a computer. The communication mode with the main control chip U1 adopts UART serial port mode, the control of the voice decoding chip U2 can be satisfied only by occupying two port resources of the main control chip U1, the port resource of the main control chip U1 is saved, meanwhile, the voice decoding chip U2 can support reading of different voice version identities, so that whether the burned voice file is correct or not can be checked, because the voice decoding chip U2 can support UART serial port to update voice files, the voice decoding chip U2 can be burned by the main control chip U1 (the main control chip U1 plays a role of transparent transmission), therefore, the main control chip U1 updates the main program and the voice decoding chip U2 updates the voice file through the UART serial port of the main control chip U1, finally realizes the unification of the burning tools, in addition, the voice decoding chip U2 also supports a burning tool provided by a supplier and burns a voice file to the voice decoding chip U2 through a burning port. Because main control chip U1, pronunciation decoding chip U2, pronunciation power amplifier and on-chip resistance-capacitance can all adopt the paster device, reduce the device quantity, need not manually place the SD card, manufacturability reinforcing, the cost also greatly reduces.
Further, referring to fig. 2, the PWM voice output circuit 100 further includes a first resistor R1, a second resistor R2, and a first capacitor C1; wherein the content of the first and second substances,
the first end of the first resistor R1 is connected with an asynchronous serial port input end UART _ RX of the main control chip U1, the second end of the first resistor R1 is connected with an output end TX of the voice decoding chip U2, the second end of the first resistor R1 is connected with the first end of the second resistor R2, the second end of the second resistor R2 is connected with a power supply, the first end of the first resistor R1 is connected with the first end of the first capacitor C1, and the second end of the first capacitor C1 is grounded.
It is easy to understand that the power source may be a +5V power source, the PWM voice output circuit 100 may further include a first resistor R1, a second resistor R2 and a first capacitor C1, the main control chip U1 may communicate with the voice decoding chip U2 through a UART serial port, the main control chip U1 may receive a signal fed back by the voice decoding chip U2 through an asynchronous serial port input terminal UART _ RX, and the first resistor R1, the second resistor R2 and the first capacitor C1 may constitute a signal receiving circuit of the main control chip U1.
Further, referring to fig. 2, the PWM voice output circuit 100 further includes a third resistor R3, a fourth resistor R4, and a second capacitor C2; wherein the content of the first and second substances,
the first end of fourth resistance R4 with main control chip U1's asynchronous serial port output UART _ TX is connected, the second end of fourth resistance R4 with voice decoding chip U2's input RX is connected, the second end of fourth resistance R4 with second electric capacity C2's first end is connected, second electric capacity C2's second end ground connection, the first end of fourth resistance R4 with the first end of third resistance R3 is connected, the second end of third resistance R3 is connected with the power.
It should be noted that the power supply may be a +5V power supply, the PWM voice output circuit 100 may further include a third resistor R3, a fourth resistor R4, and a second capacitor C2, the main control chip U1 may communicate with the voice decoding chip U2 through a UART serial port, the main control chip U1 may send a voice output signal to the voice decoding chip U2 through an asynchronous serial port output terminal UART _ TX, and the third resistor R3, the fourth resistor R4, and the second capacitor C2 may form an output signal circuit of the main control chip U1.
Further, referring to fig. 2, the PWM buck circuit 200 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6; wherein the content of the first and second substances,
a first end of the fifth resistor R5 is connected to the PWM voice output circuit 100, a second end of the fifth resistor R5 is connected to a first end of the seventh resistor R7, a first end of the sixth resistor R6 is connected to the PWM voice output circuit 100, a second end of the sixth resistor R6 is connected to a second end of the seventh resistor R7, a first end of the seventh resistor R7 is connected to a first end of the third capacitor C3, a second end of the third capacitor C3 is grounded, a second end of the seventh resistor R7 is connected to a first end of the fourth capacitor C4, a second end of the fourth capacitor C4 is grounded, a first end of the third capacitor C3 is connected to a first end of the fifth capacitor C5, a first end of the fourth capacitor C4 is connected to a first end of the sixth capacitor C6, and a second end of the fifth capacitor C5 is connected to the power amplifier circuit 300, a second end of the sixth capacitor C6 is connected to the power amplifier circuit 300.
It should be understood that the PWM voltage-reducing circuit 200 may include a voltage-reducing circuit composed of a resistor and an RC filter circuit composed of a resistor and a capacitor, and the voltage-reducing PWM voice signal is obtained by reducing and filtering the voltage of the PWM voice signal through the voltage-reducing circuit and the RC filter circuit, and the PWM voice signal is processed by the PWM voltage-reducing circuit 200 to output the voltage-reducing PWM voice signal, where the voltage-reducing PWM voice signal is a continuous analog voice signal. The PWM step-down circuit 200 may include a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6, wherein the fifth resistor R5 and the sixth resistor R6 may form a step-down circuit, the seventh resistor R7, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, and the sixth capacitor C6 may form an RC filter circuit, and the PWM step-down circuit 200 may also employ other types of step-down circuits and filter circuits, which is not limited in this embodiment.
Further, referring to fig. 2, the power amplification circuit 300 includes a power amplification chip U3, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, and a seventh capacitor C7; wherein the content of the first and second substances,
a first end of the eighth resistor R8 is connected to the PWM buck circuit 200, a second end of the eighth resistor R8 is connected to a first end of the seventh capacitor C7, a first end of the ninth resistor R9 is connected to the PWM buck circuit 200, a second end of the ninth resistor R9 is connected to a first end of the seventh capacitor C7, and a first end of the seventh capacitor C7 is connected to the input terminal of the power amplifier chip U3;
a first end of the tenth resistor R10 is connected to the PWM step-down circuit 200, a second end of the tenth resistor R10 is connected to the second end of the seventh capacitor C7, a first end of the eleventh resistor R11 is connected to the PWM step-down circuit 200, a second end of the eleventh resistor R11 is connected to the second end of the seventh capacitor C7, and a second end of the seventh capacitor C7 is connected to the input terminal of the power amplifier chip U3.
It should be noted that the power amplifier circuit 300 may include a power amplifier chip U3, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, and a seventh capacitor C7, where the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, and the seventh capacitor C7 constitute a peripheral circuit of the power amplifier chip U3, and the step-down PWM voice signal is amplified by the power amplifier chip U3 to obtain an amplified PWM voice signal, where the amplified PWM voice signal may be a set of amplified PWM voice signals including an amplified PWM voice positive signal and an amplified PWM voice negative signal.
Specifically, the buck PWM voice signal input to the power amplification chip U3 may include a buck PWM voice positive signal and a buck PWM voice negative signal, the eighth resistor R8 is connected in parallel with the ninth resistor R9, and the eighth resistor R8 is connected in parallel with the ninth resistor R9 to form an input signal circuit of the buck PWM voice positive signal; the tenth resistor R10 and the eleventh resistor R11 are connected in parallel, and the tenth resistor R10 and the eleventh resistor R11 are connected in parallel to form an input signal circuit of the buck PWM voice negative signal.
Further, referring to fig. 2, the power amplifying circuit 300 further includes a twelfth resistor R12, a thirteenth resistor R13, and an eighth capacitor C8; wherein the content of the first and second substances,
a first end of the twelfth resistor R12 is connected to the PWM voice output circuit 100, a second end of the twelfth resistor R12 is connected to the control end SHUTDOWN of the power amplification chip U3, a second end of the twelfth resistor R12 is connected to the first end of the thirteenth resistor R13, a second end of the thirteenth resistor R13 is grounded, a first end of the thirteenth resistor R13 is connected to the first end of the eighth capacitor C8, and a second end of the eighth capacitor C8 is grounded.
It is easy to understand that the power amplifying circuit 300 may further include a twelfth resistor R12, a thirteenth resistor R13, and an eighth capacitor C8; the twelfth resistor R12, the thirteenth resistor R13, and the eighth capacitor C8 may form a control circuit of the power amplification chip U3, a first end of the twelfth resistor R12 is connected to the PWM voice output circuit 100, a second end of the twelfth resistor R12 is connected to the control end SHUTDOWN of the power amplification chip U3, specifically, a first end of the twelfth resistor R12 is connected to the control end SHUTDOWN of the main control chip U1 in the PWM voice output circuit 100, and the main control chip U1 may control the power amplification chip U3.
It should be understood that the Windows System may be provided with a program named shutdown.exe, and may be used for SHUTDOWN operation (in the Windows \ System 32), in general, SHUTDOWN of the Windows System may be implemented by calling the program shutdown.exe, and the program may also be used to terminate the SHUTDOWN operation in the plan, the main control chip U1 may receive the program instruction of shutdown.exe, and according to the program instruction of shutdown.exe, the control terminal SHUTDOWN of the main control chip U1 may be used to control the power amplification chip U3.
Further, referring to fig. 2, the output filter circuit 400 includes a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4; wherein the content of the first and second substances,
a first end of the ninth capacitor C9 is connected to the power amplifier circuit 300, a second end of the ninth capacitor C9 is grounded, a first end of the tenth capacitor C10 is connected to the power amplifier circuit 300, a second end of the tenth capacitor C10 is grounded, a first end of the ninth capacitor C9 is connected to a first end of the eleventh capacitor C11, a second end of the eleventh capacitor C11 is grounded, a first end of the tenth capacitor C10 is connected to a first end of the twelfth capacitor C12, and a second end of the twelfth capacitor C12 is grounded;
the first end of the ninth capacitor C9 is connected to the anode of the first diode D1 and the cathode of the second diode D2, respectively, the cathode of the first diode D1 is connected to the power supply, the anode of the second diode D2 is grounded, the first end of the tenth capacitor C10 is connected to the cathode of the third diode D3 and the anode of the fourth diode D4, the anode of the third diode D3 is grounded, and the cathode of the fourth diode D4 is connected to the power supply.
It should be noted that the power supply may be a +5V power supply, the PWM voice signal is processed by the PWM step-down circuit 200 and then outputs a step-down PWM voice signal, the step-down PWM voice signal is a continuous analog voice signal, and the analog voice signal is amplified by the power amplification circuit 300 and then processed by the primary output filter circuit 400, so as to drive the speaker to produce sound. Output filter circuit 400 receives the amplified PWM voice signal and filters the amplified PWM voice signal to obtain a filtered PWM voice signal, which may be a set of filtered PWM voice signals including a filtered PWM voice positive signal and a filtered PWM voice negative signal.
Specifically, the output filter circuit 400 may include a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4; the ninth capacitor C9, the eleventh capacitor C11, the first diode D1 and the second diode D2 may constitute a first output filter circuit in the output filter circuit 400, for outputting the filtered PWM voice positive signal to the speaker; the tenth capacitor C10, the twelfth capacitor C12, the third diode D3 and the fourth diode D4 may constitute a second output filter circuit in the output filter circuit 400, for outputting the filtered PWM voice negative signal to the speaker; the output filter circuit 400 outputs the filtered PWM speech signal to the speaker to sound the speaker.
In order to achieve the above object, the present invention further provides a power amplifier of a voice chip, wherein the power amplifier of the voice chip comprises the power amplifier circuit of the voice chip. The specific structure of the power amplification circuit of the voice chip refers to the above embodiments, and since the power amplification device of the voice chip adopts all the technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.
In order to achieve the above object, the utility model discloses still provide an elevator, the elevator includes as above the power amplification device of pronunciation chip. The specific structure of the power amplifying device of the voice chip refers to the above embodiments, and the elevator adopts all technical solutions of all the above embodiments, so that the power amplifying device at least has all beneficial effects brought by the technical solutions of the above embodiments, and is not described in detail herein.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A power amplifying circuit of a voice chip is characterized in that the power amplifying circuit of the voice chip comprises a PWM voice output circuit, a PWM voltage reduction circuit, a power amplifying circuit and an output filter circuit which are sequentially connected, wherein the output filter circuit is connected with a loudspeaker; wherein the content of the first and second substances,
the PWM voice output circuit is used for outputting a PWM voice signal to the PWM voltage reduction circuit;
the PWM voltage reduction circuit is used for receiving the PWM voice signal and reducing the voltage of the PWM voice signal to obtain a voltage reduction PWM voice signal;
the PWM voltage reduction circuit is also used for outputting the voltage reduction PWM voice signal to the power amplification circuit;
the power amplifying circuit is used for receiving the voltage reduction PWM voice signal and amplifying the voltage reduction PWM voice signal to obtain an amplified PWM voice signal;
the power amplifying circuit is also used for outputting the amplified PWM voice signal to the output filter circuit;
the output filter circuit is used for receiving the amplified PWM voice signal and filtering the amplified PWM voice signal to obtain a filtered PWM voice signal;
the output filter circuit is further configured to output the filtered PWM voice signal to the speaker, so that the speaker produces sound.
2. The power amplifier circuit of the voice chip as claimed in claim 1, wherein the PWM voice output circuit comprises a main control chip and a voice decoding chip, an asynchronous serial port output terminal of the main control chip is connected to an input terminal of the voice decoding chip, and an asynchronous serial port input terminal of the main control chip is connected to an output terminal of the voice decoding chip; wherein the content of the first and second substances,
the main control chip is used for sending a voice output signal to the voice decoding chip;
the voice decoding chip is used for decoding the voice output signal to obtain a PWM voice signal;
the voice decoding chip is also used for outputting PWM voice signals to the PWM voltage reduction circuit.
3. The power amplifier circuit of the voice chip according to claim 2, wherein the PWM voice output circuit further comprises a first resistor, a second resistor, and a first capacitor; wherein the content of the first and second substances,
the first end of the first resistor is connected with the asynchronous serial port input end of the main control chip, the second end of the first resistor is connected with the output end of the voice decoding chip, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the power supply, the first end of the first resistor is connected with the first end of the first capacitor, and the second end of the first capacitor is grounded.
4. The power amplifier circuit of the voice chip according to claim 3, wherein the PWM voice output circuit further comprises a third resistor, a fourth resistor, and a second capacitor; wherein the content of the first and second substances,
the first end of the fourth resistor is connected with the asynchronous serial port output end of the main control chip, the second end of the fourth resistor is connected with the input end of the voice decoding chip, the second end of the fourth resistor is connected with the first end of the second capacitor, the second end of the second capacitor is grounded, the first end of the fourth resistor is connected with the first end of the third resistor, and the second end of the third resistor is connected with the power supply.
5. The power amplification circuit of the voice chip of any one of claims 1 to 4, wherein the PWM voltage reduction circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, a third capacitor, a fourth capacitor, a fifth capacitor and a sixth capacitor; wherein the content of the first and second substances,
the first end of the fifth resistor is connected with the PWM voice output circuit, the second end of the fifth resistor is connected with the first end of the seventh resistor, the first end of the sixth resistor is connected with the PWM voice output circuit, the second end of the sixth resistor is connected with the second end of the seventh resistor, the first end of the seventh resistor is connected with the first end of the third capacitor, the second end of the third capacitor is grounded, the second end of the seventh resistor is connected with the first end of the fourth capacitor, the second end of the fourth capacitor is grounded, the first end of the third capacitor is connected with the first end of the fifth capacitor, the first end of the fourth capacitor is connected with the first end of the sixth capacitor, and the second end of the fifth capacitor is connected with the power amplification circuit, and the second end of the sixth capacitor is connected with the power amplification circuit.
6. The power amplification circuit of the voice chip of any one of claims 1 to 4, wherein the power amplification circuit comprises a power amplification chip, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor and a seventh capacitor; wherein the content of the first and second substances,
a first end of the eighth resistor is connected with the PWM step-down circuit, a second end of the eighth resistor is connected with a first end of the seventh capacitor, a first end of the ninth resistor is connected with the PWM step-down circuit, a second end of the ninth resistor is connected with a first end of the seventh capacitor, and a first end of the seventh capacitor is connected with an input end of the power amplification chip;
a first end of the tenth resistor is connected to the PWM step-down circuit, a second end of the tenth resistor is connected to a second end of the seventh capacitor, a first end of the eleventh resistor is connected to the PWM step-down circuit, a second end of the eleventh resistor is connected to a second end of the seventh capacitor, and a second end of the seventh capacitor is connected to the input terminal of the power amplifier chip.
7. The power amplifier circuit of the speech chip according to claim 6, wherein the power amplifier circuit further comprises a twelfth resistor, a thirteenth resistor and an eighth capacitor; wherein the content of the first and second substances,
the first end of the twelfth resistor is connected with the PWM voice output circuit, the second end of the twelfth resistor is connected with the control end of the power amplification chip, the second end of the twelfth resistor is connected with the first end of the thirteenth resistor, the second end of the thirteenth resistor is grounded, the first end of the thirteenth resistor is connected with the first end of the eighth capacitor, and the second end of the eighth capacitor is grounded.
8. The power amplifier circuit of the voice chip according to any one of claims 1 to 4, wherein the output filter circuit comprises a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a first diode, a second diode, a third diode, and a fourth diode; wherein the content of the first and second substances,
a first end of the ninth capacitor is connected with the power amplification circuit, a second end of the ninth capacitor is grounded, a first end of the tenth capacitor is connected with the power amplification circuit, a second end of the tenth capacitor is grounded, a first end of the ninth capacitor is connected with a first end of the eleventh capacitor, a second end of the eleventh capacitor is grounded, a first end of the tenth capacitor is connected with a first end of the twelfth capacitor, and a second end of the twelfth capacitor is grounded;
the first end of the ninth capacitor is connected with the anode of the first diode and the cathode of the second diode respectively, the cathode of the first diode is connected with a power supply, the anode of the second diode is grounded, the first end of the tenth capacitor is connected with the cathode of the third diode and the anode of the fourth diode respectively, the anode of the third diode is grounded, and the cathode of the fourth diode is connected with the power supply.
9. A power amplifier of a voice chip, characterized in that the power amplifier of the voice chip comprises the power amplifier circuit of the voice chip as claimed in any one of claims 1 to 8.
10. An elevator, characterized in that the elevator comprises a power amplification device of the voice chip of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021675866.XU CN212726950U (en) | 2020-08-12 | 2020-08-12 | Power amplification circuit and device of voice chip and elevator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021675866.XU CN212726950U (en) | 2020-08-12 | 2020-08-12 | Power amplification circuit and device of voice chip and elevator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212726950U true CN212726950U (en) | 2021-03-16 |
Family
ID=74921225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021675866.XU Active CN212726950U (en) | 2020-08-12 | 2020-08-12 | Power amplification circuit and device of voice chip and elevator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212726950U (en) |
-
2020
- 2020-08-12 CN CN202021675866.XU patent/CN212726950U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103098039B (en) | High-speed peripheral device interconnection bus port collocation method and equipment | |
| CN103309408A (en) | Function extension combination module for intelligent terminal | |
| CN108062950A (en) | The Dongle equipment and voice awakening method that a kind of voice wakes up | |
| CN212726950U (en) | Power amplification circuit and device of voice chip and elevator | |
| CN100426597C (en) | Connector of mobile device and digital products and method thereof | |
| CN105355223A (en) | Novel wireless audio playback system and initialization method therefor | |
| CN209233999U (en) | A kind of phantom power for microphone power | |
| CN212990674U (en) | Elevator voice broadcast circuit, device and instruction board in sedan-chair | |
| CN100489762C (en) | Loudspeaker box control driving method and system thereof | |
| CN201207726Y (en) | Simple power amplifier having automatically switching function | |
| CN209059183U (en) | A kind of ED detection device and system | |
| CN206283664U (en) | A kind of multifunction speech card for intelligent robot system | |
| CN210958759U (en) | Audio power amplification system for electronic toll collection | |
| CN210777014U (en) | Multifunctional voice playing module | |
| CN103840426B (en) | One kind rises voltage protection circuit | |
| CN205140516U (en) | Novel wireless audio playback system | |
| CN210515279U (en) | 260Pin interface core board | |
| CN2906824Y (en) | Electronic voice card | |
| CN203193615U (en) | TCAS transmitter capable of realizing whisper calling function with lower-power consumption | |
| CN211454287U (en) | Intelligent touch panel control circuit with voice function and equipment | |
| CN202275452U (en) | USB customer evaluation device | |
| US20070005162A1 (en) | Lighting audio playing apparatus | |
| CN201293910Y (en) | Multimedia projection combined machine | |
| CN208126185U (en) | A kind of industrial intelligent controlling terminal | |
| CN201974781U (en) | Mouse card reader |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |