CN219351890U - Voltage control circuit and audio processing circuit - Google Patents

Voltage control circuit and audio processing circuit Download PDF

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Publication number
CN219351890U
CN219351890U CN202223217918.0U CN202223217918U CN219351890U CN 219351890 U CN219351890 U CN 219351890U CN 202223217918 U CN202223217918 U CN 202223217918U CN 219351890 U CN219351890 U CN 219351890U
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circuit
voltage
resistor
output
switching tube
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冯伟伟
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Shenzhen Pudu Technology Co Ltd
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Shenzhen Pudu Technology Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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Abstract

The present application relates to a voltage control circuit and an audio processing circuit. The voltage control circuit comprises a switch circuit and a voltage output circuit, wherein the input end of the switch circuit is connected with a voltage source, the output end of the switch circuit is connected with the input end of the voltage output circuit, and the output end of the voltage output circuit is connected with a power amplifier circuit; when the input voltage provided by the voltage source is smaller than the preset voltage, the low-level signal output by the voltage output circuit enables the power amplifier circuit to be turned off; when the input voltage is greater than or equal to the preset voltage, the high-level signal output by the voltage output circuit enables the power amplifier circuit to work normally. The voltage control circuit can restrain noise signals under the condition that the controller is not electrified.

Description

Voltage control circuit and audio processing circuit
Technical Field
The present disclosure relates to the field of circuit technologies, and in particular, to a voltage control circuit and an audio processing circuit.
Background
The power amplification chip in the audio processing circuit is used for amplifying the input audio signals and outputting the amplified audio signals through the loudspeaker. During the process of starting up or shutting down the audio processing circuit, the power amplifier circuit can pick up noise signals, so that the loudspeaker emits noise.
In the related art, in order to suppress noise signals existing in the starting or shutting process, the controller can detect the state of the switch key, and when the switch key is detected to be in the on state, the controller controls the enabling end of the audio power amplifier chip to be in the off state, so that the purpose of suppressing the noise signals is achieved.
However, the related art cannot suppress the noise signal when the controller is not powered on.
Disclosure of Invention
In view of the above, it is desirable to provide a voltage control circuit and an audio processing circuit that can suppress noise signals when a controller is not powered on.
In a first aspect, the present application provides a voltage control circuit, the voltage control circuit including a switch circuit and a voltage output circuit, an input terminal of the switch circuit being connected to a voltage source, an output terminal of the switch circuit being connected to an input terminal of the voltage output circuit, an output terminal of the voltage output circuit being connected to a power amplifier circuit;
when the input voltage provided by the voltage source is smaller than the preset voltage, the low-level signal output by the voltage output circuit enables the power amplifier circuit to be turned off;
when the input voltage is greater than or equal to the preset voltage, the high-level signal output by the voltage output circuit enables the power amplifier circuit to work normally.
In one embodiment, the switching circuit comprises a voltage stabilizing circuit and a logic conversion circuit, wherein the input end of the voltage stabilizing circuit is connected with a voltage source, the output end of the voltage stabilizing circuit is connected with the input end of the logic conversion circuit, and the output end of the logic conversion circuit is connected with the input end of the voltage output circuit;
when the input voltage is smaller than the preset voltage, the voltage stabilizing circuit and the logic conversion circuit are in a non-conducting state;
when the input voltage is greater than or equal to the preset voltage, the logic conversion circuit is in a conducting state under the voltage output by the voltage stabilizing circuit.
In one embodiment, the voltage stabilizing circuit comprises a voltage dividing circuit and a voltage stabilizer, wherein the input end of the voltage dividing circuit is connected with a voltage source, the output end of the voltage dividing circuit is connected with the input end of the voltage stabilizer, and the output end of the voltage stabilizer is connected with the logic conversion circuit;
when the input voltage is smaller than the preset voltage, the voltage stabilizer is in a non-conducting state after the voltage of the input voltage is divided by the voltage dividing circuit;
when the input voltage is greater than or equal to the preset voltage, the voltage stabilizer is in a conducting state after the voltage of the input voltage is divided by the voltage dividing circuit.
In one embodiment, the voltage dividing circuit includes a first resistor and a second resistor, a first end of the first resistor is connected with the voltage source, a second end of the first resistor is connected with a first end of the second resistor and an input end of the voltage stabilizer respectively, and a second end of the second resistor is grounded.
In one embodiment, the logic conversion circuit comprises a first switch tube, a third resistor and a fourth resistor, wherein the first end of the fourth resistor and the first end of the first switch tube are respectively connected with the voltage source, the first end of the third resistor is connected with the output end of the voltage stabilizing circuit, the second end of the third resistor is respectively connected with the second end of the fourth resistor and the second end of the first switch tube, and the third end of the first switch tube is connected with the voltage output circuit.
In one embodiment, the logic conversion circuit includes a second switching tube, a fifth resistor and a sixth resistor, wherein a first end of the fifth resistor is connected with a third end of the first switching tube, a second end of the fifth resistor is connected with a first end of the second switching tube and a first end of the sixth resistor respectively, a second end of the second switching tube is connected with the voltage output circuit, and a second end of the sixth resistor and a third end of the second switching tube are grounded.
In one embodiment, the voltage output circuit comprises a reversing circuit and a push-pull circuit, wherein the input end of the reversing circuit is connected with the output end of the switching circuit, the output end of the reversing circuit is connected with the input end of the push-pull circuit, and the output end of the push-pull circuit is connected with the power amplifier circuit;
when the switch circuit is in a non-conducting state, the reverse circuit is in a non-conducting state, and correspondingly, the push-pull circuit outputs a low level;
when the switch circuit is in a conducting state, the reversing circuit is in a conducting state, and correspondingly, the push-pull circuit outputs a high level.
In one embodiment, the reverse circuit comprises a third switching tube, a seventh resistor and an eighth resistor, wherein a first end of the seventh resistor is connected with the voltage source, a second end of the seventh resistor is respectively connected with a first end of the eighth resistor and a first end of the third switching tube, a second end of the third switching tube is connected with the push-pull circuit, and a second end of the eighth resistor and a third end of the third switching tube are grounded.
In one embodiment, the push-pull circuit comprises a fourth switching tube, a fifth switching tube and a ninth resistor, wherein the first end of the ninth resistor is connected with the voltage source, the second end of the ninth resistor is respectively connected with the first ends of the fourth switching tube and the fifth switching tube, the second end of the fourth switching tube is connected with the voltage source, and the third end of the fourth switching tube is connected with the second end of the fifth switching tube and the power amplifier circuit;
when the reverse circuit is in a conducting state, the fifth switching tube outputs a low-level signal;
when the reverse circuit is in a non-conducting state, the fourth switching tube outputs a high-level signal.
In a second aspect, the present application also provides an audio processing circuit comprising any one of the voltage control circuits of the first aspect.
The voltage control circuit comprises a switch circuit and a voltage output circuit, wherein the input end of the switch circuit is connected with a voltage source, the output end of the switch circuit is connected with the input end of the voltage output circuit, and the output end of the voltage output circuit is connected with the power amplifier circuit; when the input voltage provided by the voltage source is smaller than the preset voltage, the voltage output circuit outputs a low-level signal to the power amplifier circuit so as to close the power amplifier circuit; when the input voltage is greater than or equal to the preset voltage, the voltage output circuit outputs a high-level signal to the power amplifier circuit so that the power amplifier circuit works normally. The voltage control circuit can accurately determine whether the switch circuit is in conduction or not by comparing the input voltage provided by the voltage source with the preset voltage, so that the output level signal of the voltage output circuit can be accurately determined to be a high level signal or a low level signal, and the state of the power amplifier circuit can be accurately controlled; when the controller is not electrified, the state of the power amplifier circuit is controlled by the voltage control circuit, so that the power amplifier circuit is prevented from introducing noise signals, and the noise signals can be effectively restrained.
Drawings
FIG. 1 is a schematic diagram of a prior art audio processing circuit in one embodiment;
FIG. 2 is a schematic diagram of a voltage control circuit in one embodiment;
FIG. 3 is a schematic diagram of a voltage control circuit in one embodiment;
FIG. 4 is a schematic diagram of a voltage control circuit in one embodiment;
FIG. 5 is a schematic diagram of a voltage control circuit in one embodiment;
FIG. 6 is a schematic diagram of a voltage control circuit in one embodiment;
FIG. 7 is a schematic diagram of a voltage control circuit in one embodiment;
FIG. 8 is a schematic diagram of a voltage control circuit in one embodiment;
FIG. 9 is a schematic diagram of a voltage control circuit in one embodiment;
FIG. 10 is a schematic diagram of a voltage control circuit in one embodiment;
FIG. 11 is a schematic diagram of a voltage control circuit in one embodiment;
fig. 12 is a schematic diagram of an audio processing circuit in the present embodiment in one embodiment.
Reference numerals illustrate:
11: an audio processing circuit; 12: an audio input circuit;
13: a power amplifier chip; 14: a filter circuit;
15: a speaker; 16: a single chip microcomputer;
17: an audio source and a control chip; 21: a voltage control circuit;
22: a switching circuit; 23: a voltage output circuit;
231: an inverting circuit; 2311: a third switching tube;
2312: a seventh resistor; 2313: an eighth resistor;
232: a push-pull circuit; 2321: a fourth switching tube;
2322: a fifth switching tube; 2323: a ninth resistor;
24: a voltage source; 25: a power amplifier circuit;
26: a voltage stabilizing circuit; 261: a voltage dividing circuit;
262: a voltage stabilizer; 2611: a first resistor;
2612: a second resistor; 27: a logic conversion circuit;
271: a first switching tube; 272: a third resistor;
273: a fourth resistor; 274: a second switching tube;
275: a fifth resistor; 276: and a sixth resistor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
Prior to the description of the embodiments of the present application, the technical background of the present application will be described first.
With the continuous development of intelligent technology, audio processing devices are disposed in most terminal devices, and the terminal devices interact intelligently with other terminal devices through the audio processing devices, for example, the terminal devices can be mobile phones, intelligent wearable devices, robots, etc.
The audio processing device can send out noise signals at the moment of starting up, shutting down or hot plugging, and the use experience of a user is seriously affected. The above-mentioned audio processing device is provided with the audio processing circuit 11, and the audio processing circuit 11 includes the audio input circuit 12, the power amplifier chip 13, the filter circuit 14 and the speaker 15, and it is found that, through research, the noise signal in the scene is collected due to the enabling end of the power amplifier chip 13, which results in the terminal device sending out the noise signal at the moment of starting up, shutting down or hot plug.
In the related art, in order to reduce the noise signals, the robot may configure a singlechip 16 in the audio processing circuit 11, where the singlechip 16 and the audio input circuit 12 are both disposed in an audio source and a control chip 17, fig. 1 shows a schematic diagram of the audio processing circuit in the prior art, and in the normal power-on and power-off process, the singlechip 16 controls the enable end of the power amplification chip 13 to be in a closed state so as to suppress the noise signals in the normal power-on and power-off processes.
However, when the power supply in the terminal device is suddenly turned off (for example, the battery is exhausted), the singlechip 16 is in a turned-off state, and cannot control the enable end of the power amplifier chip 13, and still emits a noise signal.
In order to suppress noise signals caused by hot plugging, the present application provides a voltage control circuit 21, and a technical solution of the voltage control circuit 21 provided in the present application is described in detail below.
In one embodiment, fig. 2 provides a schematic diagram of a voltage control circuit, where the voltage control circuit 21 includes a switch circuit 22 and a voltage output circuit 23, an input terminal of the switch circuit 22 is connected to a voltage source 24, an output terminal of the switch circuit 22 is connected to an input terminal of the voltage output circuit 23, and an output terminal of the voltage output circuit 23 is connected to a power amplifier circuit 25; when the input voltage provided by the voltage source 24 is smaller than the preset voltage, the low-level signal output by the voltage output circuit 23 causes the power amplifier circuit 25 to be turned off; when the input voltage is greater than or equal to the preset voltage, the high level signal output by the voltage output circuit 23 makes the power amplifier circuit 25 work normally.
In the present embodiment, the switch circuit 22 includes two states, i.e. conductive and nonconductive, and whether the switch circuit 22 is conductive is determined by the input voltage of the voltage source 24 and the preset voltage. The switch circuit 22 may be a triode switch circuit, a field effect transistor switch circuit, a touch switch circuit, a temperature control switch circuit, a single key switch circuit, a light control switch circuit, or a photoelectric switch circuit. Alternatively, the switching circuit 22 may be a circuit formed by combining a plurality of different switching circuits with other electronic components. The present embodiment is not limited to the electronic components contained inside the switch circuit 22. The voltage output circuit 23 may output a high level signal and a low level signal based on the state of the switching circuit 22. The voltage output circuit 23 may be a circuit composed of a transistor circuit, a field effect transistor circuit, and other electronic components.
In the process of powering up the power amplifier circuit 25, the input voltage of the voltage source 24 gradually rises from zero, and after the voltage rises to a certain range, the input voltage of the voltage source 24 is stable; during the power-down of the power amplifier circuit 25, the input voltage of the voltage source 24 gradually decreases from a stable voltage until the input voltage of the voltage source 24 is zero. For example, during the power-up process, after the voltage rises from 0V to 24V, a stable 24V voltage is output; during power down, the voltage drops from a steady 24V voltage to 0V.
The preset voltage may be obtained from historical experience, and may be a voltage between the highest voltage output by the voltage source 24 and 0V. For example, when the highest voltage is 29.4V, the preset voltage may be set to 16.5V. Correspondingly, when the input voltage of the voltage source 24 is smaller than 16.5V, the switch circuit 22 is not conducted, the voltage output circuit 23 outputs a low-level signal to the power amplifier circuit 25, the enabling end of the power amplifier circuit 25 is in a closed state, the power amplifier circuit 25 does not work, and the loudspeaker 15 does not emit noise; when the input voltage of the voltage source 24 is greater than or equal to 16.5V, the switch circuit 22 is turned on, the voltage output circuit 23 outputs a high-level signal to the power amplifier circuit 25, the enable end of the power amplifier circuit 25 is in an on state, and the power amplifier circuit 25 works normally.
The voltage control circuit comprises a switch circuit and a voltage output circuit, wherein the input end of the switch circuit is connected with a voltage source, the output end of the switch circuit is connected with the input end of the voltage output circuit, and the output end of the voltage output circuit is connected with the power amplifier circuit; when the input voltage provided by the voltage source is smaller than the preset voltage, the voltage output circuit outputs a low-level signal to the power amplifier circuit so as to close the power amplifier circuit; when the input voltage is greater than or equal to the preset voltage, the voltage output circuit outputs a high-level signal to the power amplifier circuit so that the power amplifier circuit works normally. The voltage control circuit can accurately determine whether the switch circuit is in conduction or not by comparing the input voltage provided by the voltage source with the preset voltage, so that the output level signal of the voltage output circuit can be accurately determined to be a high level signal or a low level signal, and the state of the power amplifier circuit can be accurately controlled; when the controller is not electrified, the state of the power amplifier circuit is controlled by the voltage control circuit, so that the power amplifier circuit is prevented from introducing noise signals, and the noise signals can be effectively restrained.
Based on the embodiment of fig. 2, the embodiment specifically describes the content of the switch circuit 22 in the embodiment, and fig. 3 provides a schematic diagram of a voltage control circuit, where the switch circuit 22 includes a voltage stabilizing circuit 26 and a logic conversion circuit 27, an input end of the voltage stabilizing circuit 26 is connected to the voltage source 24, an output end of the voltage stabilizing circuit 26 is connected to an input end of the logic conversion circuit 27, and an output end of the logic conversion circuit 27 is connected to an input end of the voltage output circuit 23; when the input voltage is smaller than the preset voltage, the voltage stabilizing circuit 26 and the logic conversion circuit 27 are in a non-conducting state; when the input voltage is greater than or equal to the preset voltage, the logic conversion circuit 27 is in a conductive state at the voltage output from the voltage stabilizing circuit 26.
In the present embodiment, the voltage stabilizing circuit 26 is connected to the voltage source 24, the logic conversion circuit 27 is connected to the voltage output circuit 23, and the voltage stabilizing circuit 26 and the logic conversion circuit 27 constitute the switching circuit 22. The voltage stabilizing circuit 26 and the logic conversion circuit 27 both comprise a conducting state and a non-conducting state, and the states of the voltage stabilizing circuit 26 and the logic conversion circuit 27 are consistent, namely when the voltage stabilizing circuit 26 is conducted, the corresponding logic conversion circuit 27 is conducted; when the voltage stabilizing circuit 26 is not conducted, the corresponding logic conversion circuit 27 is also not conducted. The voltage stabilizing circuit 26 may include a semiconductor zener diode, an ion discharge voltage stabilizer, a magnetic saturation voltage stabilizer, a magnetic resonance voltage stabilizer, or the like. The logic conversion circuit 27 may include a level conversion circuit composed of transistors, or the like.
The switching circuit in the voltage control circuit comprises a voltage stabilizing circuit and a logic conversion circuit, wherein the input end of the voltage stabilizing circuit is connected with a voltage source, the output end of the voltage stabilizing circuit is connected with the input end of the logic conversion circuit, and the output end of the logic conversion circuit is connected with the input end of the voltage output circuit; when the input voltage is smaller than the preset voltage, the voltage stabilizing circuit and the logic conversion circuit are in a non-conducting state; when the input voltage is greater than or equal to the preset voltage, the logic conversion circuit is in a conducting state under the voltage output by the voltage stabilizing circuit. The switching circuit determines whether the switching state is conducted or not through the states of the voltage stabilizing circuit and the logic conversion circuit, and the switching circuit is conducted only when the voltage stabilizing circuit and the logic conversion circuit are both in the conducting state; any one of the voltage stabilizing circuit and the logic conversion circuit is not conducted, and the switching circuit is not conducted, so that whether the switching circuit is conducted or not can be more accurately determined, whether the power amplification circuit is conducted or not can be accurately controlled, and noise signals are effectively restrained.
Based on the embodiment of fig. 3, the present embodiment specifically describes the content of the voltage stabilizing circuit in the switch circuit in the embodiment, and fig. 4 provides a schematic diagram of a voltage control circuit, where the voltage stabilizing circuit 26 includes a voltage dividing circuit 261 and a voltage stabilizer 262, an input end of the voltage dividing circuit 261 is connected with the voltage source 24, an output end of the voltage dividing circuit 261 is connected with an input end of the voltage stabilizer 262, and an output end of the voltage stabilizer 262 is connected with the logic conversion circuit 27; when the input voltage is smaller than the preset voltage, the voltage stabilizer 262 is in a non-conducting state after the voltage division circuit 261 divides the input voltage; when the input voltage is greater than or equal to the preset voltage, the voltage regulator 262 is in a conductive state after the input voltage is divided by the voltage dividing circuit 261.
In the present embodiment, the purpose of the voltage dividing circuit 261 to divide the output voltage of the voltage source 24 is to protect the voltage regulator 262, and after the output voltage of the voltage source 24 passes through the voltage dividing circuit 261, the input voltage of the voltage regulator 262 is equal to the difference between the output voltage of the voltage source 24 and the voltage on the voltage dividing circuit 261. The voltage divider 261 may include a capacitive voltage divider and a resistive voltage divider. The resistor voltage dividing circuit can be a slide rheostat or a resistor voltage dividing circuit consisting of two resistors connected in series.
In the process of powering up the power amplifier circuit 25, the output voltage of the voltage source 24 gradually increases from zero, when the output voltage of the voltage source 24 is smaller than a preset voltage, the output voltage of the voltage source 24 is divided by the voltage dividing circuit 261, the output voltage of the voltage dividing circuit 261 is smaller than the conducting voltage of the voltage stabilizer 262, and the voltage stabilizer 262 cannot be conducted; when the output voltage of the voltage source 24 is greater than or equal to the preset voltage, the output voltage of the voltage source 24 is divided by the voltage dividing circuit 261, and then the output circuit of the voltage dividing circuit 261 is greater than the turn-on voltage of the voltage regulator 262, and the voltage regulator 262 is in a turn-on state. During the power-down process of the power amplifier circuit 25, the output voltage of the voltage source 24 gradually drops to zero, and when the output voltage of the voltage source 24 is smaller than the preset voltage, the voltage stabilizer is in a non-conducting state.
The voltage stabilizing circuit comprises a voltage dividing circuit and a voltage stabilizer, wherein the input end of the voltage dividing circuit is connected with a voltage source, the output end of the voltage dividing circuit is connected with the input end of the voltage stabilizer, and the output end of the voltage stabilizer is connected with a logic conversion circuit; when the input voltage is smaller than the preset voltage, the voltage stabilizer is in a non-conducting state after the voltage of the input voltage is divided by the voltage dividing circuit; when the input voltage is greater than or equal to the preset voltage, the voltage stabilizer is in a conducting state after the voltage of the input voltage is divided by the voltage dividing circuit. The voltage stabilizing circuit divides the output voltage of the voltage source through the voltage dividing circuit, so that the smaller the output voltage of the voltage dividing circuit is, namely the smaller the input voltage of the voltage stabilizer connected with the output end of the voltage dividing circuit is, the damage to the voltage stabilizer caused by the overlarge voltage is prevented, and the voltage stabilizer is protected from stably running in the circuit.
Based on the embodiment of fig. 4, the content of the voltage dividing circuit in the voltage stabilizing circuit in the embodiment is specifically described, and fig. 5 provides a schematic diagram of a voltage control circuit, where the voltage dividing circuit 261 includes a first resistor 2611 and a second resistor 2612, a first end of the first resistor 2611 is connected to the voltage source 24, a second end of the first resistor 2611 is connected to a first end of the second resistor 2612 and an input end of the voltage stabilizer 262, and a second end of the second resistor 2612 is grounded.
In the above embodiment, the voltage dividing circuit 261 may include a capacitive voltage dividing circuit and a resistive voltage dividing circuit, which is described as an example in this embodiment, where the voltage dividing circuit 261 includes a first resistor 2611 and a second resistor 2612 connected in parallel, the first resistor 2611 is connected to the voltage source 24, and the second resistor is connected in parallel to the voltage regulator 262. In the voltage dividing circuit 261, the output voltage of the voltage source 24 acts on the first resistor 2611 and the second resistor 2612, and the voltage across the voltage regulator 262 is the same as the voltage across the second resistor 2612.
The voltage dividing circuit comprises a first resistor and a second resistor, wherein the first end of the first resistor is connected with a voltage source, the second end of the first resistor is respectively connected with the first end of the second resistor and the input end of the voltage stabilizer, and the second end of the second resistor is grounded. The voltage divider circuit divides the voltage input into the voltage stabilizer through the two fixed resistors, so that the input voltage of the voltage stabilizer can be prevented from being overlarge, and the voltage stabilizer is prevented from being damaged due to overlarge input voltage.
Based on the embodiment of fig. 3, the embodiment specifically describes the content of the logic conversion circuit in the switch circuit in the embodiment, fig. 6 provides a schematic diagram of a voltage control circuit, the logic conversion circuit 27 includes a first switch tube 271, a third resistor 272 and a fourth resistor 273, the first end of the fourth resistor 273 and the first end of the first switch tube 271 are respectively connected with the voltage source 24, the first end of the third resistor 272 is connected with the output end of the voltage stabilizing circuit 26, the second end of the third resistor 272 is respectively connected with the second end of the fourth resistor 273 and the second end of the first switch tube 271, and the third end of the first switch tube 271 is connected with the voltage output circuit 23.
In this embodiment, the switching transistor refers to a dedicated transistor used instead of a mechanical switch, and the switching transistor may be a transistor and a field effect transistor, the transistor may be an electronic transistor or a bipolar transistor, and the field effect transistor may be a Junction FET (JFET), a Metal-oxide semiconductor FET (MOS-FET).
Taking the first switching tube 271 as an NMOS tube, the third resistor 272 and the fourth resistor 273 are also connected in series for dividing the output voltage of the voltage regulator 262, when the voltage regulator 262 is turned on, the voltage applied to the gate of the first switching tube 271 is smaller than the voltage applied to the source of the first switching tube 271, the first switching tube 271 is turned on, the first switching tube 271 is in the same conductive state as the voltage regulator 262, the voltage regulator 262 is turned on, and the first switching tube 271 is turned on; the regulator 262 is not turned on, and the first switching tube 271 is not turned on.
The logic conversion circuit comprises a first switch tube, a third resistor and a fourth resistor, wherein the first end of the fourth resistor and the first end of the first switch tube are respectively connected with a voltage source, the first end of the third resistor is connected with the output end of the voltage stabilizing circuit, the second end of the third resistor is respectively connected with the second end of the fourth resistor and the second end of the first switch tube, and the third end of the first switch tube is connected with the voltage output circuit. In the circuit, the output voltage of the voltage stabilizer is divided by a third resistor and a fourth resistor, so that the first switching tube is protected; meanwhile, the first switching tube is designed to have the same conducting state with the voltage stabilizer, so that voltage can pass through the voltage stabilizer and the logic conversion circuit.
Based on the embodiment of fig. 6, the content of the logic conversion circuit in the embodiment is still specifically described, fig. 7 provides a schematic diagram of a voltage control circuit, where the logic conversion circuit 27 further includes a second switch tube 274, a fifth resistor 275 and a sixth resistor 276, a first end of the fifth resistor 275 is connected to the third end of the first switch tube 271, a second end of the fifth resistor 275 is connected to the first end of the second switch tube 274 and the first end of the sixth resistor 276, a second end of the second switch tube 274 is connected to the voltage output circuit 23, and a second end of the sixth resistor 276 and a third end of the second switch tube 274 are grounded.
In this embodiment, the second switching tube 274 may be a triode, a PNP triode, an NMOS tube, or a PMOS tube. In this circuit, the second switching tube 274 is used as a triode, the fifth resistor 275 and the sixth resistor 276 are also connected in series, and are used for dividing the output voltage of the first switching tube 271, when the first switching tube 271 is turned on, the second switching tube 274, the first switching tube 271 and the voltage stabilizer 262 are in the same conduction state, the voltage stabilizer 262 is turned on, and the first switching tube 271 and the second switching tube 274 are turned on; the regulator 262 is not turned on, and the first switching tube 271 and the second switching tube 274 are not turned on.
The logic conversion circuit further comprises a second switching tube, a fifth resistor and a sixth resistor, wherein the first end of the fifth resistor is connected with the third end of the first switching tube, the second end of the fifth resistor is respectively connected with the first end of the second switching tube and the first end of the sixth resistor, the second end of the second switching tube is connected with the voltage output circuit, and the second end of the sixth resistor and the third end of the second switching tube are grounded. In the circuit, the output voltage of the first switching tube is divided by the fifth resistor and the sixth resistor, so that the second switching tube is protected; meanwhile, the second switching tube is designed to be the same as the first switching tube and the voltage stabilizer in conduction state, so that voltage can pass through the voltage stabilizer, the first switching tube and the second switching tube.
On the basis of the embodiment of fig. 2, the embodiment will be described in detail with respect to the specific content of the voltage output circuit 23 in the embodiment, and fig. 8 provides a schematic diagram of a voltage control circuit, where the voltage output circuit 23 includes a reverse circuit 231 and a push-pull circuit 232, an input end of the reverse circuit 231 is connected to an output end of the switch circuit 22, an output end of the reverse circuit 231 is connected to an input end of the push-pull circuit 232, and an output end of the push-pull circuit 232 is connected to the power amplifier circuit 25; when the switch circuit 22 is in a non-conductive state, the reverse circuit 231 is in a non-conductive state, and correspondingly, the push-pull circuit 232 outputs a low level; when the switch circuit 22 is in the on state, the reverse circuit 231 is in the on state, and correspondingly, the push-pull circuit 232 outputs a high level.
In the present embodiment, the voltage output circuit 23 includes a reverse circuit 231 and a push-pull circuit 232, and the reverse circuit 231 may be an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) having reverse blocking capability, a resonant circuit, a bidirectional switch, a matrix converter, or the like.
The push-pull circuit 232 can accelerate the control speed in the process of signal control or driving, the push-pull circuit 232 can comprise a PNP triode and an NPN triode, the PNP triode and the NPN triode are connected in parallel, the upper position and the lower position of the PNP triode and the NPN triode are different, two push-pull circuit structures can be formed, one structure is provided with the PNP triode at the upper part, the NPN triode is provided with the NPN triode at the lower part, the other structure is provided with the NPN triode at the upper part, and the PNP triode is provided with the PNP triode at the lower part.
The voltage output circuit comprises a reversing circuit and a push-pull circuit, wherein the input end of the reversing circuit is connected with the output end of the switching circuit, the output end of the reversing circuit is connected with the input end of the push-pull circuit, and the output end of the push-pull circuit is connected with the power amplifier circuit; when the switch circuit is in a non-conducting state, the reverse circuit is in a non-conducting state, and correspondingly, the push-pull circuit outputs a low level; when the switch circuit is in a conducting state, the reversing circuit is in a conducting state, and correspondingly, the push-pull circuit outputs a high level. In the circuit, the on state of the switching circuit is accurately determined by designing the reverse circuit, so that the output signal of the push-pull circuit can be accurately determined, the power amplifier circuit can be further controlled, the noise signal is prevented from being introduced into the power amplifier circuit, and the noise signal can be effectively restrained.
Based on the embodiment of fig. 7, the embodiment will be further described with reference to the content of the inverting circuit 231 in the voltage output circuit of the embodiment, and fig. 9 provides a schematic voltage control circuit, where the inverting circuit 231 includes a third switching tube 2311, a seventh resistor 2312 and an eighth resistor 2313, the first end of the seventh resistor 2312 is connected to the voltage source 24, the second end of the seventh resistor 2312 is connected to the first end of the eighth resistor 2313 and the first end of the third switching tube 2311, the second end of the third switching tube 2311 is connected to the push-pull circuit 232, and the second end of the eighth resistor 2313 and the third end of the third switching tube 2311 are grounded.
In this embodiment, the third switch 2311 may be an NPN transistor, a PNP transistor, an NMOS transistor, or a PMOS transistor. In this circuit, the third switching tube 2311 is described as a PNP triode, the seventh resistor 2312 and the eighth resistor 2313 are also connected in series, and are used for dividing the output voltage of the second switching tube 274, when the second switching tube 274 is turned on, the third switching tube 2311 is not turned on, and the third switching tube 2311 is turned on in reverse to the conduction states of the second switching tube 274, the first switching tube 271 and the voltage regulator 262, the first switching tube 271 and the second switching tube 274 are turned on, and correspondingly, the third switching tube 2311 is not turned on; the voltage regulator 262, the first switching tube 271 and the second switching tube 274 are not turned on, and correspondingly, the third switching tube 2311 is turned on.
The reversing circuit comprises a third switching tube, a seventh resistor and an eighth resistor, wherein the first end of the seventh resistor is connected with a voltage source, the second end of the seventh resistor is respectively connected with the first end of the eighth resistor and the first end of the third switching tube, the second end of the third switching tube is connected with the push-pull circuit, and the second end of the eighth resistor and the third end of the third switching tube are grounded. The reversing circuit divides the output voltage of the second switching tube through a seventh resistor and an eighth resistor to protect the third switching tube; meanwhile, the third switching tube is designed to be opposite to the switching circuit in conduction state, and the reverse circuit is designed to be conducted under the condition that the switching circuit is not conducted; in the case where the switching circuit is conductive, the inverter circuit is not conductive.
Based on the embodiment of fig. 7, the embodiment still specifically describes the content of the push-pull circuit 232 in the voltage output circuit of the embodiment, fig. 10 provides a schematic diagram of a voltage control circuit, where the push-pull circuit 232 includes a fourth switching tube 2321, a fifth switching tube 2322 and a ninth resistor 2323, a first end of the ninth resistor 2323 is connected to a voltage source, a second end of the ninth resistor 2323 is connected to the fourth switching tube 2321 and a first end of the fifth switching tube 2322, a second end of the fourth switching tube 2321 is connected to the voltage source 24, and a third end of the fourth switching tube 2321 is connected to a second end of the fifth switching tube 2322 and the power amplifier circuit 25; when the reverse circuit 231 is in the on state, the fifth switching tube 2322 outputs a low-level signal; the fourth switching tube 2321 outputs a high-level signal when the inverting circuit 231 is in a non-conductive state.
In this embodiment, the fourth switching tube 2321 is taken as an NPN triode, the fifth switching tube 2322 is a PNP triode, and the fourth switching tube 2321 is arranged above, and the fifth switching tube 2322 is arranged below. When voltage is input from the first ends of the fourth switching tube 2321 and the fifth switching tube 2322, current flows in the fourth switching tube 2321 arranged above, the fourth switching tube 2321 is conducted, the fifth switching tube 2322 is not conducted, and the fourth switching tube 2321 outputs a high-level signal to the power amplifier circuit 25; when a voltage is input from the third terminal of the fourth switching tube 2321 and the first terminal of the fifth switching tube 2322, the fourth switching tube 2321 is not turned on, the fifth switching tube 2322 is turned on, and the fifth switching tube 2322 outputs a low-level signal to the power amplifying circuit 25.
The push-pull circuit comprises a voltage control circuit schematic diagram, and comprises a fourth switching tube, a fifth switching tube and a ninth resistor, wherein the first end of the ninth resistor is connected with a voltage source, the second end of the ninth resistor is respectively connected with the first ends of the fourth switching tube and the fifth switching tube, the second end of the fourth switching tube is connected with the voltage source, and the third end of the fourth switching tube is connected with the second end of the fifth switching tube and a power amplifier circuit; when the reverse circuit is in a conducting state, the fifth switching tube outputs a low-level signal; when the reverse circuit is in a non-conducting state, the fourth switching tube outputs a high-level signal. The push-pull circuit can output a high-level signal when the reverse circuit is not conducted and output a low-level signal when the reverse circuit is conducted, so that the power amplifier circuit can be effectively controlled, the noise signal is prevented from being introduced into the power amplifier circuit, and the noise signal can be effectively restrained.
Fig. 11 shows a schematic diagram of a voltage control circuit, and fig. 11 includes a voltage control circuit 21 and a power amplifier circuit 25, in which the switch circuit 22 is composed of a plurality of resistors, zener diodes, NMOS transistors and transistors in the voltage control circuit 21.
The voltage stabilizing circuit 26 in the switch circuit 22 includes two resistors and a voltage stabilizing diode, the two resistors are a first resistor 2611 and a second resistor 2612, the first resistor 2611 and the second resistor 2612 form a voltage dividing circuit 261, and the voltage stabilizer 262 is the voltage stabilizing diode in the figure. The first end of the first resistor 2611 is connected to the voltage source 24, the second end of the first resistor 2611 is connected to the first end of the second resistor 2612 and the input end of the voltage regulator 262, and the second end of the second resistor 2612 is grounded.
The logic conversion circuit 27 in the switch circuit 22 includes four resistors, namely a third resistor 272, a fourth resistor 273, a fifth resistor 275 and a sixth resistor 276, an NMOS transistor, namely a first switch tube 271, and a triode, namely a second switch tube 274. The first end of the fourth resistor 273 and the first end of the first switching tube 271 are respectively connected with the voltage source 24, the first end of the third resistor 272 is connected with the output end of the voltage stabilizing circuit 26, the second end of the third resistor 272 is respectively connected with the second end of the fourth resistor 273 and the second end of the first switching tube 271, the third end of the first switching tube 271 is respectively connected with the first end of the fifth resistor 275 and the first end of the sixth resistor 276, the second end of the fifth resistor 275 and the second end of the sixth resistor 276 are connected with the first end of the second switching tube 274, the second end of the second switching tube 274 is connected with the voltage output circuit 23, and the second end of the sixth resistor 276 and the third end of the second switching tube 274 are grounded.
The inverting circuit 231 in the voltage output circuit 23 includes a triode and two resistors, the triode is a third switching tube 2311, the two resistors are a seventh resistor 2312 and an eighth resistor 2313, the first end of the seventh resistor 2312 is connected to the voltage source 24, the second end of the seventh resistor 2312 is connected to the first end of the eighth resistor 2313 and the first end of the third switching tube 2311, the second end of the third switching tube 2311 is connected to the push-pull circuit 232, and the second end of the eighth resistor 2313 and the third end of the third switching tube 2311 are grounded.
The push-pull circuit 232 in the voltage output circuit 23 comprises a resistor and two triodes, wherein one resistor is a ninth resistor 2323, the two triodes are a fourth switching tube 2321 and a fifth switching tube 2322 respectively, a first end of the ninth resistor 2323 is connected with a voltage source, a second end of the ninth resistor 2323 is connected with the first ends of the fourth switching tube 2321 and the fifth switching tube 2322 respectively, a second end of the fourth switching tube 2321 is connected with the voltage source 24, and a third end of the fourth switching tube 2321 is connected with a second end of the fifth switching tube 2322 and the power amplifier circuit 25; when the reverse circuit 231 is in the on state, the fifth switching tube 2322 outputs a low-level signal; the fourth switching tube 2321 outputs a high-level signal when the inverting circuit 231 is in a non-conductive state.
In addition, two resistors may be provided between the voltage output circuit 23 and the power amplifier circuit 25, one for dividing the voltage output from the voltage output circuit 23 and one for dividing the output current.
In one embodiment, fig. 12 provides an audio processing circuit including an audio input circuit, a voltage control circuit, and a power amplifier circuit, the voltage control circuit being a circuit shown in any of the voltage control circuits described above.
In this embodiment, the voltage control circuit 21 and the single-chip microcomputer 16 are combined to control the audio processing circuit 11, under the condition that the audio processing circuit 11 is in a normal working state, the single-chip microcomputer 16 is used to control the enabling pin of the power amplification chip 13, and during the starting, shutdown or hot plug process of the audio processing circuit 11, the voltage control circuit 21 in this scheme is used to control the enabling pin of the power amplification chip 13, and the single-chip microcomputer 16 is combined with the voltage control circuit 21 to inhibit noise signals transmitted through the enabling end of the power amplification chip 13, so that noise signals of terminal equipment can be inhibited.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not thereby to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.

Claims (10)

1. The voltage control circuit is characterized by comprising a switch circuit and a voltage output circuit, wherein the input end of the switch circuit is connected with a voltage source, the output end of the switch circuit is connected with the input end of the voltage output circuit, and the output end of the voltage output circuit is connected with a power amplifier circuit;
when the input voltage provided by the voltage source is smaller than the preset voltage, the low-level signal output by the voltage output circuit enables the power amplifier circuit to be turned off;
when the input voltage is greater than or equal to the preset voltage, the high-level signal output by the voltage output circuit enables the power amplifier circuit to work normally.
2. The circuit of claim 1, wherein the switching circuit comprises a voltage stabilizing circuit and a logic conversion circuit, wherein an input terminal of the voltage stabilizing circuit is connected to the voltage source, an output terminal of the voltage stabilizing circuit is connected to an input terminal of the logic conversion circuit, and an output terminal of the logic conversion circuit is connected to an input terminal of the voltage output circuit;
when the input voltage is smaller than the preset voltage, the voltage stabilizing circuit and the logic conversion circuit are in a non-conducting state;
when the input voltage is greater than or equal to the preset voltage, the logic conversion circuit is in a conducting state under the voltage output by the voltage stabilizing circuit.
3. The circuit of claim 2, wherein the voltage stabilizing circuit comprises a voltage dividing circuit and a voltage stabilizer, wherein an input end of the voltage dividing circuit is connected with the voltage source, an output end of the voltage dividing circuit is connected with an input end of the voltage stabilizer, and an output end of the voltage stabilizer is connected with the logic conversion circuit;
when the input voltage is smaller than the preset voltage, the voltage stabilizer is in a non-conducting state after the voltage division circuit divides the input voltage;
when the input voltage is greater than or equal to the preset voltage, the voltage stabilizer is in a conducting state after the voltage division circuit divides the input voltage.
4. The circuit of claim 3, wherein the voltage divider circuit comprises a first resistor and a second resistor, a first end of the first resistor is connected to the voltage source, a second end of the first resistor is connected to a first end of the second resistor and an input end of the voltage regulator, respectively, and a second end of the second resistor is grounded.
5. The circuit of claim 2, wherein the logic conversion circuit comprises a first switch tube, a third resistor and a fourth resistor, wherein a first end of the fourth resistor and a first end of the first switch tube are respectively connected with the voltage source, a first end of the third resistor is connected with an output end of the voltage stabilizing circuit, a second end of the third resistor is respectively connected with a second end of the fourth resistor and a second end of the first switch tube, and a third end of the first switch tube is connected with the voltage output circuit.
6. The circuit of claim 5, wherein the logic conversion circuit further comprises a second switch tube, a fifth resistor and a sixth resistor, a first end of the fifth resistor is connected to a third end of the first switch tube, a second end of the fifth resistor is connected to a first end of the second switch tube and a first end of the sixth resistor, a second end of the second switch tube is connected to the voltage output circuit, and a second end of the sixth resistor and a third end of the second switch tube are grounded.
7. The circuit according to any one of claims 1 to 6, wherein the voltage output circuit comprises a reverse circuit and a push-pull circuit, an input end of the reverse circuit is connected with an output end of the switch circuit, an output end of the reverse circuit is connected with an input end of the push-pull circuit, and an output end of the push-pull circuit is connected with the power amplifier circuit;
when the switch circuit is in a non-conducting state, the reverse circuit is in a conducting state, and correspondingly, the push-pull circuit outputs a low level;
when the switch circuit is in a conducting state, the reversing circuit is in a non-conducting state, and correspondingly, the push-pull circuit outputs a high level.
8. The circuit of claim 7, wherein the inverting circuit comprises a third switching tube, a seventh resistor, and an eighth resistor, a first end of the seventh resistor is connected to the voltage source, a second end of the seventh resistor is connected to the first end of the eighth resistor and the first end of the third switching tube, respectively, a second end of the third switching tube is connected to the push-pull circuit, and a second end of the eighth resistor and a third end of the third switching tube are grounded.
9. The circuit of claim 7, wherein the push-pull circuit comprises a fourth switching tube, a fifth switching tube and a ninth resistor, wherein a first end of the ninth resistor is connected with the voltage source, a second end of the ninth resistor is respectively connected with the first ends of the fourth switching tube and the fifth switching tube, a second end of the fourth switching tube is connected with the voltage source, and a third end of the fourth switching tube is connected with the second end of the fifth switching tube and the power amplifier circuit;
when the reverse circuit is in a conducting state, the fifth switching tube outputs a low-level signal;
and when the reverse circuit is in a non-conducting state, the fourth switching tube outputs a high-level signal.
10. An audio processing circuit comprising a voltage control circuit as claimed in any one of claims 1 to 9.
CN202223217918.0U 2022-11-30 2022-11-30 Voltage control circuit and audio processing circuit Active CN219351890U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202223217918.0U CN219351890U (en) 2022-11-30 2022-11-30 Voltage control circuit and audio processing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202223217918.0U CN219351890U (en) 2022-11-30 2022-11-30 Voltage control circuit and audio processing circuit

Publications (1)

Publication Number Publication Date
CN219351890U true CN219351890U (en) 2023-07-14

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