CN117728782A - Self-adaptive audio power amplification circuit and chip capable of matching external boosting - Google Patents
Self-adaptive audio power amplification circuit and chip capable of matching external boosting Download PDFInfo
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- CN117728782A CN117728782A CN202311733579.8A CN202311733579A CN117728782A CN 117728782 A CN117728782 A CN 117728782A CN 202311733579 A CN202311733579 A CN 202311733579A CN 117728782 A CN117728782 A CN 117728782A
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Abstract
The invention discloses a matched external boosting self-adaptive audio power amplifying circuit, which comprises an audio power amplifier chip, a boosting chip, a first resistor, a second resistor and a boosting peripheral circuit, wherein the boosting chip comprises a switch control pin and a voltage feedback pin, and the audio power amplifier chip comprises a power voltage control pin and a current output pin. Three ends of the boost peripheral circuit are respectively and electrically connected with a power supply, a switch control pin, a first resistor and a connection part of the power voltage control pin; the voltage feedback pin and the current output pin are electrically connected with the joint of the first resistor and the second resistor; the two resistors are connected in series, and the second resistor is grounded; the audio power amplifier chip also comprises a first control circuit and/or a second control circuit, the current change of the current output pins is controlled by the two control circuits, the parallel equivalent resistance of the first resistor and/or the second resistor is changed, and the regulation voltage of the power voltage control pins is regulated by the boosting chip and the boosting peripheral circuit.
Description
Technical Field
The invention relates to the technical field of audio power amplification, in particular to a matched external boosting self-adaptive audio power amplification circuit and a chip.
Background
In recent years, an audio power amplifier integrated with a built-in boost module has been widely used, wherein the voltage output by the boost module changes with the amplitude of the input audio, that is, the boost adaptive mode, but the voltage directly jumps, so that a great overshoot current is generated. In addition, the boost module is integrated in the audio power amplifier, the internal circuit is relatively easy to construct and realize, but the boost module is built in, so that a user cannot independently maintain and select the boost module, and the boost module is poor in flexibility and controllability in selection and use.
Disclosure of Invention
The invention mainly solves the technical problems of poor controllability of a boosting module and extremely large overshoot current generated by direct voltage jump, and provides a matched external boosting self-adaptive audio power amplifying circuit.
In order to solve the technical problems, the invention adopts a technical scheme that the invention provides a matched external boost self-adaptive audio power amplifying circuit, which comprises an audio power amplifier chip, a boost chip, a first resistor, a second resistor and a boost peripheral circuit,
the boost chip comprises a switch control pin and a voltage feedback pin, and the audio power amplifier chip comprises a power voltage control pin and a current output pin; the first end of the boosting peripheral circuit is electrically connected with a power supply, the second end of the boosting peripheral circuit is electrically connected with a switch control pin, and the third end of the boosting peripheral circuit is electrically connected with the first end of the first resistor and the power voltage control pin respectively; the voltage feedback pin is respectively and electrically connected with the second end of the first resistor and the first end of the second resistor; the current output pin is electrically connected with the first end of the second resistor, and the second end of the second resistor is grounded;
the audio power amplifier chip further comprises a first control circuit and/or a second control circuit, the audio power amplifier chip controls the current change of the current output pin through the first control circuit and/or the second control circuit, the parallel equivalent resistance of the first resistor and/or the parallel equivalent resistance of the second resistor is changed, and then the regulation and control voltage of the power voltage control pin is regulated through the boosting chip and the boosting peripheral circuit.
In some embodiments, the first control circuit includes a first resistor control network, a first smoothing circuit, a third resistor, a first operational amplifier, a second operational amplifier, a first PMOS transistor, a second PMOS transistor, and a third PMOS transistor;
the first end of the first resistor control network is electrically connected with the non-inverting input end of the first operational amplifier and the drain electrode of the first PMOS tube, a first smoothing circuit is arranged between the second end of the first resistor control network and the inverting input end of the second operational amplifier, the third end of the first resistor control network is grounded, the output end of the first operational amplifier is electrically connected with the grid electrode of the first PMOS tube, the source electrode of the first PMOS tube is electrically connected with the source electrode of the second PMOS tube and the source electrode of the third PMOS tube and is commonly connected with the power supply end of the audio power amplifier chip, the grid electrodes of the second PMOS tube and the third PMOS tube are both electrically connected with the output end of the second operational amplifier, the drain electrode of the second PMOS tube and the non-inverting input end of the second operational amplifier are both electrically connected with the first end of the third resistor, the second end of the third resistor is grounded, and the drain electrode of the third PMOS tube is electrically connected with the current output pin.
In some embodiments, the first resistor control network includes a plurality of boost control voltage dividing resistors and boost control on-off switches, the boost control voltage dividing resistors are sequentially connected in series, a first end of each boost control voltage dividing resistor is connected with one boost control on-off switch in parallel, and the other ends of the plurality of parallel boost control on-off switches are electrically connected together to serve as a second end of the first resistor control network; wherein, the first end of the first lifting voltage dividing resistor of the header is used as the first end of the first resistor control network; the second end of the last boost control voltage dividing resistor at the tail part is used as the third end of the first resistor control network to be grounded; the first resistor control network is used for selectively regulating and outputting different voltages to the second operational amplifier.
In some embodiments, the first smoothing circuit further includes a fourth resistor and a first capacitor, a first end of the fourth resistor is electrically connected to a second end of the first resistor control network, a second end of the fourth resistor is electrically connected to an inverting input end of the second operational amplifier and a first end of the first capacitor, respectively, a second end of the first capacitor is grounded, and the fourth resistor and the first capacitor are used for smoothing a voltage output by the first resistor control network.
In some embodiments, the second control circuit includes a second resistor control network, a second smoothing circuit, a fifth resistor, a third operational amplifier, a fourth operational amplifier, a first NMOS transistor, a second NMOS transistor, and a third NMOS transistor;
the first end of the second resistance control network is electrically connected with the non-inverting input end of the third operational amplifier and the drain electrode of the first NMOS tube, a second smoothing circuit is arranged between the second end of the second resistance control network and the inverting input end of the fourth operational amplifier, the third end of the second resistance control network is electrically connected with the inverting input end of the third operational amplifier and the first end of the fifth resistance, the third end of the second resistance control network is commonly connected with the power supply end of the audio power amplifier chip, the grid electrode of the first NMOS tube is electrically connected with the output end of the third operational amplifier, the source electrode of the first NMOS tube is grounded, the second end of the fifth resistance is electrically connected with the non-inverting input end of the fourth operational amplifier and the drain electrode of the second NMOS tube, the grid electrode of the second NMOS tube is electrically connected with the output end of the fourth operational amplifier and the grid electrode of the third NMOS tube, the sources of the second NMOS tube and the third NMOS tube are grounded, and the drain electrode of the third NMOS tube is electrically connected with the current output pin.
In some embodiments, the second resistor control network includes a plurality of voltage-dividing resistors with drop control and drop control on-off switches, the plurality of voltage-dividing resistors with drop control are connected in series in turn, a second end of each voltage-dividing resistor with drop control on-off switch is connected in parallel, and the other ends of the plurality of parallel voltage-dividing resistors with drop control on-off switches are electrically connected together to serve as a second end of the second resistor control network; wherein, the first end of the first drop-controlled voltage dividing resistor of the head is used as the third end of the second resistor control network; the second end of the last voltage-dividing resistor of the tail is also used as the first end of the second resistor control network; the second resistance control network is used for selectively regulating and outputting different voltages to the fourth operational amplifier.
In some embodiments, the second smoothing circuit further includes a sixth resistor and a second capacitor, a first end of the sixth resistor is electrically connected to a second end of the second resistor control network, a second end of the sixth resistor is electrically connected to an inverting input end of the fourth operational amplifier and a first end of the second capacitor, respectively, a second end of the second capacitor is grounded, and the sixth resistor and the second capacitor are used for smoothing a voltage output by the second resistor control network.
In some embodiments, the boost peripheral circuit includes an inductor, a zener diode, and a third capacitor, wherein a first end of the inductor is electrically connected to the power supply, a second end of the inductor is electrically connected to the switch control pin and an anode of the zener diode, a cathode of the zener diode is electrically connected to a first end of the first resistor, the power voltage control pin, and an anode of the third capacitor, respectively, and a cathode of the third capacitor is grounded.
Based on the same inventive concept, the invention also provides an audio power amplifier chip, which comprises a power voltage control pin, a current output pin, a first control circuit and/or a second control circuit.
The current output pin is used for being connected with a voltage feedback pin of an external boost chip, and the power voltage control pin is used for being connected with a switch control pin of the boost chip.
The audio power amplifier chip controls the current change of the current output pin through the first control circuit and/or the second control circuit, and then adjusts the regulation voltage of the power voltage control pin through the voltage feedback pin.
In some embodiments, one end of the first control circuit is connected to the power supply end of the audio power amplifier chip, the other end of the first control circuit is connected to the current output pin, and n+1 parallel control-lifting current branches are arranged in the middle; one end of the second control circuit is grounded, the other end of the second control circuit is connected with a current output pin, n+1 parallel control-reducing current branches are arranged in the middle, and n is more than or equal to 1.
The beneficial effects of the invention are as follows: the invention provides a matched external boosting self-adaptive audio power amplifying circuit, an audio power amplifying chip injects current through a current output pin, and changes the parallel equivalent resistance of a first resistor and/or the parallel equivalent resistance of a second resistor, so that the voltage regulation and control of a power voltage control pin is regulated through a boosting chip and a boosting peripheral circuit, the step-type change of the current and the voltage is realized, meanwhile, the external boosting chip is convenient for a user to freely select for matching, and the flexibility and the controllability are strong.
Drawings
FIG. 1 is a circuit diagram of one embodiment of a matched external boost adaptive audio power amplifier circuit of the present invention;
FIG. 2 is a schematic diagram illustrating the principle of a first control circuit and a second control circuit of an embodiment of the matched external boost adaptive audio power amplifier circuit of the present invention;
FIG. 3 is a schematic diagram illustrating a first control circuit of an embodiment of the matched external boost adaptive audio power amplifier circuit according to the present invention;
FIG. 4 is a schematic diagram illustrating a second control circuit of an embodiment of the matched external boost adaptive audio power amplifier circuit according to the present invention;
FIG. 5 is a schematic diagram of voltage variation versus current variation versus matching external boost adaptive audio power amplifier circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the connection of a first control circuit of an embodiment of the matched external boost adaptive audio power amplifier circuit of the present invention;
FIG. 7 is a schematic diagram of a smooth variation of local voltage and current according to an embodiment of the present invention;
fig. 8 is a schematic diagram of connection of a second control circuit matching an embodiment of an external boost adaptive audio power amplifier circuit according to the present invention.
Detailed Description
In order that the invention may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all 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. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
Fig. 1 shows an embodiment of a matched external boost adaptive audio power amplifier circuit according to the present invention, which includes an audio power amplifier chip 1, a boost chip 2, a first resistor R1, a second resistor R2, and a boost peripheral circuit 3.
The boost chip 2 includes a switch control pin SW and a voltage feedback pin FB, the audio power amplifier chip 1 includes a power voltage control pin PVDD and a current output pin IADJ, a first end 31 of the boost peripheral circuit is electrically connected to the power supply, a second end 32 of the boost peripheral circuit is electrically connected to the switch control pin SW, and a third end 33 of the boost peripheral circuit is electrically connected to the first end of the first resistor R1 and the power voltage control pin PVDD, respectively. The voltage feedback pin FB is respectively and electrically connected with the second end of the first resistor R1 and the first end of the second resistor R2, the current output pin IADJ is electrically connected with the first end of the second resistor R2, and the second end of the second resistor R2 is grounded.
It should be noted that, for the boost chip 2, the output voltage is regulated and controlled by changing, and is limited by the boost chip 2 having multiple types, and the output voltage may be regulated and controlled in the boost direction or in the buck direction, so for the current output pin IADJ of the audio power amplifier chip 1, it is necessary to be able to adapt to the difference in the boost or buck regulation direction, and thus, multiple regulation requirements can be satisfied.
As shown in connection with fig. 2, 3, 4, the audio power amplifier chip 1 further comprises a first control circuit 11 and/or a second control circuit 12. One end of the first control electric circuit 11 is connected to a power supply end VDD (which is the power supply end of the audio power amplifier chip 1), the other end outputs IADJ, and n+1 parallel current branches are arranged in the middle; one end of the second control circuit 12 is grounded, the other end outputs IADJ, and n+1 parallel current branches are arranged in the middle. Here, n.gtoreq.1.
Specifically, the audio power amplifier chip 1 realizes the current step change of the current output pin IADJ through the sequential closing of n+1 control switches Kup to Kupn in the first control circuit 11, changes the parallel equivalent resistance Rup of the first resistor R1, and further makes the power voltage control pin through the boost chip 2 and the boost peripheral circuit 3The regulated voltage of PVDD drops. At this time, equivalent resistancePower voltage of power voltage control pinReferring to fig. 3, when the current of the current output pin IADJ increases, the corresponding equivalent resistance Rup decreases, which causes the power voltage PVDD of the power voltage control pin to decrease.
Specifically, the audio power amplifier chip 1 realizes the current step change of the current output pin IADJ by sequentially closing n+1 control switches Kdn to Kdnn in the second control circuit 12, and changes the parallel equivalent resistance Rdown of the second resistor R2, so that the regulated voltage of the power voltage control pin PVDD is increased by the boost chip 2 and the boost peripheral circuit 3. At this time, voltage vref=v (FB), equivalent resistancePower voltage of power voltage control pinReferring to fig. 4, when the current of the current output pin IADJ increases, the corresponding equivalent resistance Rdown decreases, so that the power voltage PVDD of the power voltage control pin increases.
Therefore, the audio power amplifier chip 1 outputs current at the current output pin IADJ, and the parallel equivalent resistance Rup of the first resistor R1 and/or the parallel equivalent resistance Rdown of the second resistor R2 are changed, so that the regulation voltage output by the external boost chip 2 is changed and regulated. Thus, when the audio power amplifier chip 1 detects the change of the input audio amplitude through the audio amplitude detection circuit inside the audio power amplifier chip 1, the adjusting and controlling current can be correspondingly output at the current output pin IADJ, and the voltage of the power voltage control pin PVDD of the audio power amplifier chip 1 can be adjusted and controlled through the adjusting and controlling voltage output by the external boosting chip 2. Therefore, the external boost chip 2 of various different types can be freely matched, and the function of self-adaptive regulation of audio power amplification is realized.
With reference to fig. 5, it can be seen that the trend of the current change output after passing through the audio power amplifier chip 1 and the regulation voltage change of the power voltage control pin PVDD regulated by the boost chip 2 and the boost peripheral circuit 3 realizes the step-by-step change, and avoids the overshoot voltage or current generated by directly generating large voltage or current change without the step change.
The matching external boosting self-adaptive audio power amplifying circuit has the advantages that the boosting chip 2 is externally connected with the audio power amplifier chip 1, so that a customer can conveniently and freely select boosting chips 2 of different external types to match while the self-adaptive function is realized, and the flexibility and the controllability are strong.
In some embodiments, the implementation of the first control circuit 11 in fig. 2 is as shown in fig. 6, where the first control circuit 11 includes a first resistor control network 111, a first smoothing circuit 112, and a third resistor R set1 The first operational amplifier A1, the second operational amplifier A2, the first PMOS tube P1, the second PMOS tube P2 and the third PMOS tube P3.
The first end 1111 of the first resistor control network is electrically connected to the non-inverting input end of the first operational amplifier A1 and the drain electrode of the first PMOS tube P1, a first smoothing circuit 112 is arranged between the second end 1112 of the first resistor control network and the inverting input end of the second operational amplifier A2, the third end 1113 of the first resistor control network is grounded, the output end of the first operational amplifier A1 is electrically connected to the grid electrode of the first PMOS tube P1, the source electrode of the first PMOS tube P1 is electrically connected to the source electrode of the second PMOS tube P2 and the source electrode of the third PMOS tube P3, and is commonly connected to the power supply end VDD of the audio power amplifier chip 1, the grid electrodes of the second PMOS tube P2 and the third PMOS tube P3 are electrically connected to the output end of the second operational amplifier A2, and the drain electrode of the second PMOS tube P2 and the non-inverting input end of the second operational amplifier A2 are electrically connected to the third resistor R set1 A third resistor R set1 The second end of the third PMOS tube P3 is grounded, and the drain electrode of the third PMOS tube P3 is electrically connected with a current output pin IADJ of the audio power amplifier chip.
In this embodiment, the current flowing through the second PMOS transistor P2The third PMOS tube P3 and the second PMOS tube P2 output current to the current output pin IADJ output I of the audio power amplifier chip 1 through the set proportion ADJ For externally connecting to the voltage feedback pin FB of the boost chip 2.
IN the present embodiment, VR is a built-IN reference voltage of the audio power amplifier chip 1, and different voltages vset_in may be set according to the magnitude of the audio input amplitude through the first resistance control network 111.
As shown in fig. 6, in some embodiments, the first resistor control network 111 includes n+1 up-controlled voltage dividing resistors and n+1 up-controlled on-off switches, where n+1 up-controlled voltage dividing resistors Rs 0-Rsn are sequentially connected in series, a first end of each up-controlled voltage dividing resistor is connected in parallel to one up-controlled on-off switch, and the other ends of n+1 up-controlled on-off switches Kup 0-Kupn connected in parallel are electrically connected together as the second end 1112 of the first resistor control network; wherein, the first end of the first rising control voltage dividing resistor Rsn is used as the first end 1111 of the first resistor control network; the second end of the last voltage-dividing resistor Rs0 at the tail is grounded as the third end 1113 of the first resistor control network; the first resistor control network 111 outputs different voltages vset_in to the second operational amplifier A2, and when the boost voltage value is adjusted according to the magnitude of the audio input, the on-off switches Kup to Kupn are turned on and off as required, thereby forming the required voltage vset_in to the second operational amplifier A2.
In some embodiments, the first smoothing circuit 112 further includes a fourth resistor R4 and a first capacitor C1, wherein a first end of the fourth resistor R4 is electrically connected to the second end 1112 of the first resistor control network, a second end of the fourth resistor R4 is electrically connected to the inverting input terminal of the second operational amplifier A2 and the first end of the first capacitor C1, respectively, and a second end of the first capacitor C1 is grounded. The VSET_IN is subjected to delay filtering through the fourth resistor R and the first capacitor C, so that the output voltage VSET is changed as smoothly as possible, and abrupt change is avoided.
With reference to FIG. 7, it can be seen that the voltage VSET_IN before passing through the first smoothing circuit 112 and passing through the first planeVoltage VSET after slide 112 and finally I ADJ The voltage VSET after passing through the first smoothing circuit 112 and the final I can be seen ADJ And obviously shows a smooth change trend.
In some embodiments, the implementation of the second control circuit 12 in fig. 2 is as shown in fig. 8, where the second control circuit 12 includes a second resistor control network 121, a second smoothing circuit 122, and a fifth resistor R set2 The third operational amplifier A3, the fourth operational amplifier A4, the first NMOS transistor N1, the second NMOS transistor N2 and the third NMOS transistor N3.
The first end 1211 of the second resistance control network is electrically connected with the non-inverting input end of the third operational amplifier A3 and the drain electrode of the first NMOS tube N1, the second smoothing circuit 122 is arranged between the second end 1212 of the second resistance control network and the inverting input end of the fourth operational amplifier A4, and the third end 1213 of the second resistance control network is electrically connected with the power supply end VDD of the audio power amplifier chip 1 and the fifth resistor R set2 One end of the built-in reference voltage source VR1 of the audio power amplifier chip 1 is connected to the power supply terminal VDD, and the other end is connected to the inverting input terminal of the third operational amplifier A3, so that the voltage of the inverting input terminal of the third operational amplifier A3 is VDD-VR1. The grid electrode of the first NMOS tube N1 is electrically connected with the output end of the third operational amplifier A3, the source electrode of the first NMOS tube N1 is grounded, and the fifth resistor R set2 The second end of the second NMOS tube N2 is electrically connected with the non-inverting input end of the fourth operational amplifier A4 and the drain electrode of the second NMOS tube N2, the grid electrode of the second NMOS tube N2 is electrically connected with the output end of the fourth operational amplifier A4 and the grid electrode of the third NMOS tube N3, the sources of the second NMOS tube N2 and the third NMOS tube N3 are grounded, and the drain electrode of the third NMOS tube N3 is electrically connected with the current output pin of the audio power amplifier chip.
In the present embodiment, the current flowing through the second NMOS transistor N2The third NMOS tube N3 and the second NMOS tube N2 output current to the current output pin IADJ output I of the audio power amplifier chip 1 through the set proportion ADJ For externally connecting to the voltage feedback pin FB of the boost chip 2.
As shown IN fig. 8, IN the present embodiment, VR1 is a built-IN reference voltage of the audio power amplifier chip 1, the voltage of the inverting input terminal of the third operational amplifier A3 is VDD-VR1, and different voltages vset_in1 can be set according to the magnitude of the audio input amplitude through the second resistance control network 121.
As shown in fig. 8, in some embodiments, the second resistor control network 121 includes n+1 drop voltage dividing resistors and n+1 drop on/off switches, where n+1 drop voltage dividing resistors Rss0 to Rssn are sequentially connected in series, a drop on/off switch is connected in parallel to a second end of each drop voltage dividing resistor, and the other ends of n+1 parallel drop on/off switches Kdn0 to Kdnn are electrically connected together as a second end 1212 of the second resistor control network; wherein a first end of the first drop-controlled voltage divider resistor Rss0 of the header serves as a third end 1213 of the second resistor control network; the second end of the last drop-control voltage-dividing resistor Rssn at the tail part is also used as a first end 1211 of a second resistor control network; the second resistance control network 121 is used for selectively regulating and outputting different voltages to the fourth operational amplifier A4. The second resistance control network 121 outputs different voltages vset_in1 to the fourth operational amplifier A4, and when the boost voltage value is adjusted according to the magnitude of the audio input amplitude, the on-off switches Kdn to Kdnn are turned on and off as needed, thereby forming the required voltages vset_in1 to the fourth operational amplifier A4.
IN some embodiments, the second smoothing circuit 122 further includes a sixth resistor R6 and a second capacitor C2, where a first end of the sixth resistor R6 is electrically connected to the second end 1212 of the second resistor control network, and a second end of the sixth resistor R6 is electrically connected to the inverting input end of the fourth operational amplifier A4 and the first end of the second capacitor C2, respectively, and a second end of the second capacitor C2 is grounded, and vset_in1 is subjected to delay filtering by the sixth resistor R6 and the second capacitor C2, so as to ensure that the voltage VSET1 that changes output as smoothly as possible changes as slowly as possible, and changes as smoothly as possible, without abrupt changes.
As shown in fig. 1, in some embodiments, the boost peripheral circuit 3 includes an inductor L1, a zener diode D1 and a third capacitor C3, the zener diode D1 is used for stabilizing an output voltage, a first end of the inductor L1 is electrically connected to a power supply, a second end of the inductor L1 is electrically connected to the switch control pin SW and an anode of the zener diode D1, respectively, a cathode of the zener diode D1 is electrically connected to a first end of the first resistor R1, the power voltage control pin PVDD and an anode of the third capacitor C3, respectively, a cathode of the third capacitor C3 is grounded, and the third capacitor C3 is used for further stabilizing a voltage after passing through the zener diode D1.
Based on the same inventive concept, the present invention further provides an audio power amplifier chip 1, which includes a power voltage control pin PVDD and a current output pin IADJ, and further includes a first control circuit 11 and/or a second control circuit 12 (the embodiments shown in fig. 2, fig. 6 and fig. 8 are not described herein again), where the audio power amplifier chip 1 can be implemented with an external boost chip 2.
Therefore, the invention discloses a self-adaptive audio power amplifier circuit matched with external boosting, the audio power amplifier chip injects current through a current output pin, the parallel equivalent resistance of a first resistor and/or the parallel equivalent resistance of a second resistor are changed, the voltage regulation and control of a power voltage control pin is further regulated through a boosting chip and a boosting peripheral circuit, the self-adaptive function is realized, a user can conveniently and freely select the external boosting chip to match, the flexibility and the controllability are high, and in addition, the smooth boosting is realized by utilizing the principle of step-by-step rising and falling and setting a smoothing circuit.
The foregoing is only illustrative of the present invention and is not to be construed as limiting the scope of the invention, and all equivalent changes made by the description of the invention and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the invention.
Claims (10)
1. The self-adaptive audio power amplifier circuit matched with external boosting is characterized by comprising an audio power amplifier chip, a boosting chip, a first resistor, a second resistor and a boosting peripheral circuit;
the boost chip comprises a switch control pin and a voltage feedback pin, and the audio power amplifier chip comprises a power voltage control pin and a current output pin; the first end of the boosting peripheral circuit is electrically connected with a power supply, the second end of the boosting peripheral circuit is electrically connected with the switch control pin, and the third end of the boosting peripheral circuit is respectively electrically connected with the first end of the first resistor and the power voltage control pin; the voltage feedback pin is respectively and electrically connected with the second end of the first resistor and the first end of the second resistor; the current output pin is electrically connected with the first end of the second resistor, and the second end of the second resistor is grounded;
the audio power amplifier chip further comprises a first control circuit and/or a second control circuit, the audio power amplifier chip controls the current change of the current output pin through the first control circuit and/or the second control circuit, and changes the parallel equivalent resistance of the first resistor and/or the parallel equivalent resistance of the second resistor, so that the regulation and control voltage of the power voltage control pin is regulated through the boosting chip and the boosting peripheral circuit.
2. The matched external boost adaptive audio power amplifier circuit of claim 1, wherein the first control circuit comprises a first resistor control network, a first smoothing circuit, a third resistor, a first operational amplifier, a second operational amplifier, a first PMOS transistor, a second PMOS transistor, and a third PMOS transistor;
the first end of the first resistor control network is electrically connected with the non-inverting input end of the first operational amplifier and the drain electrode of the first PMOS tube, the first smoothing circuit is arranged between the second end of the first resistor control network and the inverting input end of the second operational amplifier, the third end of the first resistor control network is grounded, the output end of the first operational amplifier is electrically connected with the grid electrode of the first PMOS tube, the source electrode of the first PMOS tube is electrically connected with the source electrode of the second PMOS tube and the source electrode of the third PMOS tube, and is commonly connected with the power supply end of the audio power amplifier chip, the drain electrodes of the second PMOS tube and the third PMOS tube are both electrically connected with the output end of the second operational amplifier, the non-inverting input end of the second PMOS tube and the non-inverting input end of the second operational amplifier are both electrically connected with the first end of the third resistor, the second end of the third resistor is grounded, and the drain electrode of the third PMOS tube is electrically connected with the current output pin.
3. The matched external boost self-adaptive audio power amplifying circuit according to claim 2, wherein the first resistor control network comprises a plurality of boost control voltage dividing resistors and boost control on-off switches, the boost control voltage dividing resistors are sequentially connected in series, a first end of each boost control voltage dividing resistor is connected with one boost control on-off switch in parallel, and the other ends of the boost control on-off switches which are connected in parallel are electrically connected together to serve as a second end of the first resistor control network; wherein a first end of a first one of the lifting voltage dividing resistors of the header is used as a first end of the first resistor control network; the second end of the last lifting voltage dividing resistor at the tail is used as the third end of the first resistor control network to be grounded; the first resistor control network is used for selectively regulating and controlling different voltages to be output to the second operational amplifier.
4. The matched external boost adaptive audio power amplifier circuit of claim 3, wherein the first smoothing circuit further comprises a fourth resistor and a first capacitor, a first end of the fourth resistor is electrically connected to a second end of the first resistor control network, a second end of the fourth resistor is electrically connected to an inverting input end of the second operational amplifier and a first end of the first capacitor, respectively, a second end of the first capacitor is grounded, and the fourth resistor and the first capacitor are used for smoothing a voltage output by the first resistor control network.
5. The matched external boost adaptive audio power amplifier circuit of claim 1, wherein the second control circuit comprises a second resistor control network, a second smoothing circuit, a fifth resistor, a third operational amplifier, a fourth operational amplifier, a first NMOS transistor, a second NMOS transistor, and a third NMOS transistor;
the first end of the second resistance control network is electrically connected with the non-inverting input end of the third operational amplifier and the drain electrode of the first NMOS tube, the second smoothing circuit is arranged between the second end of the second resistance control network and the inverting input end of the fourth operational amplifier, the third end of the second resistance control network is electrically connected with the inverting input end of the third operational amplifier and the first end of the fifth resistance and is commonly connected with the power supply end of the audio power amplifier chip, the grid electrode of the first NMOS tube is electrically connected with the output end of the third operational amplifier, the source electrode of the first NMOS tube is grounded, the second end of the fifth resistance is electrically connected with the non-inverting input end of the fourth operational amplifier and the drain electrode of the second NMOS tube, the grid electrode of the second NMOS tube is electrically connected with the output end of the fourth operational amplifier and the grid electrode of the third NMOS tube, the source electrodes of the second NMOS tube and the third NMOS tube are both grounded, and the drain electrode of the third NMOS tube is electrically connected with the current output pin.
6. The matched external boost self-adaptive audio power amplifying circuit according to claim 5, wherein the second resistor control network comprises a plurality of drop control voltage dividing resistors and drop control on-off switches, the drop control voltage dividing resistors are sequentially connected in series, the second end of each drop control voltage dividing resistor is connected with one drop control on-off switch in parallel, and the other ends of the drop control on-off switches connected in parallel are electrically connected together to serve as the second end of the second resistor control network; wherein, the first end of the first drop control voltage dividing resistor of the head is used as the third end of the second resistor control network; the second end of the last drop control voltage dividing resistor at the tail part is also used as the first end of the second resistor control network; the second resistance control network is used for selecting, regulating and outputting different voltages to the fourth operational amplifier.
7. The matched external boost adaptive audio power amplifier circuit of claim 6, wherein the second smoothing circuit further comprises a sixth resistor and a second capacitor, the first end of the sixth resistor is electrically connected to the second end of the second resistor control network, the second end of the sixth resistor is electrically connected to the inverting input of the fourth operational amplifier and the first end of the second capacitor, respectively, the second end of the second capacitor is grounded, and the sixth resistor and the second capacitor are used for smoothing the voltage output by the second resistor control network.
8. The matched external boost adaptive audio power amplification circuit of any one of claims 1-7, wherein the boost peripheral circuit comprises an inductor, a zener diode, and a third capacitor, a first end of the inductor is electrically connected to the power supply, a second end of the inductor is electrically connected to the switch control pin and the positive pole of the zener diode, a negative pole of the zener diode is electrically connected to the first end of the first resistor, the power voltage control pin, and the positive pole of the third capacitor, respectively, and a negative pole of the third capacitor is grounded.
9. An audio power amplifier chip, wherein the audio power amplifier chip comprises a power voltage control pin, a current output pin, a first control circuit and/or a second control circuit;
the current output pin is used for being connected with a voltage feedback pin of an external boost chip, and the power voltage control pin is used for being connected with a switch control pin of the boost chip;
the audio power amplifier chip controls the current change of the current output pin through the first control circuit and/or the second control circuit, and then adjusts the regulation voltage of the power voltage control pin through the voltage feedback pin.
10. The audio power amplifier chip of claim 9, wherein one end of the first control circuit is connected to a power supply end of the audio power amplifier chip, the other end of the first control circuit is connected to the current output pin, and n+1 parallel current-raising branches are arranged in the middle of the first control circuit; one end of the second control circuit is grounded, the other end of the second control circuit is connected with the current output pin, n+1 parallel control-reducing current branches are arranged in the middle of the second control circuit, and n is more than or equal to 1.
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| CN117728782B (en) | 2024-06-21 |
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