CN114567837A - Sensor microphone output protection circuit and sensor microphone - Google Patents
Sensor microphone output protection circuit and sensor microphone Download PDFInfo
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- CN114567837A CN114567837A CN202210186612.9A CN202210186612A CN114567837A CN 114567837 A CN114567837 A CN 114567837A CN 202210186612 A CN202210186612 A CN 202210186612A CN 114567837 A CN114567837 A CN 114567837A
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- 238000001514 detection method Methods 0.000 claims abstract description 55
- 230000003321 amplification Effects 0.000 claims description 25
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 25
- 230000002708 enhancing effect Effects 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 abstract description 15
- 230000005236 sound signal Effects 0.000 abstract description 8
- 230000002238 attenuated effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 239000000872 buffer Substances 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
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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
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides a sensor microphone output protection circuit and a sensor microphone. The sensor microphone comprises an amplifying output circuit, a power end and an audio output end, the amplifying output circuit is electrically connected with the power end and the audio output end respectively, the sensor microphone output protection circuit comprises a voltage detection module, a low-power trigger module and a switch module, the detection end of the voltage detection module is connected with the power end, the output end of the voltage detection module is electrically connected with the controlled end of the low-power trigger module, and the controlled end of the switch module is electrically connected with the low-power trigger module. The invention aims to eliminate abnormal audio signals output by the sensor microphone when the voltage of the sensor microphone is insufficient during power-on or the battery is attenuated and discharged.
Description
Technical Field
The invention relates to the technical field of microphones, in particular to a sensor microphone output protection circuit and a sensor microphone.
Background
With the expansion of consumer markets such as modern smart phones, TWS smart headsets, and smart homes, the demand for a sensor microphone (MEMS-Micro Electro Mechanical System) is relatively greatly increased. However, when the conventional sensor microphone is powered up, the voltage is insufficient or the battery is attenuated and discharged, which may cause failure of a plurality of internal modules, which may cause an abnormal output audio signal, and thus may cause a user to hear an unpleasant sound.
Disclosure of Invention
The invention mainly aims to provide a sensor microphone output protection circuit and a sensor microphone, aiming at eliminating abnormal audio signals output by the sensor microphone when the voltage of the sensor microphone is insufficient when the sensor microphone is electrified or the battery is attenuated and is not electrified.
In order to achieve the above object, the present invention provides a sensor microphone output protection circuit, applied to a sensor microphone, wherein the sensor microphone includes an amplification output circuit, a power supply terminal and an audio output terminal, the amplification output circuit is electrically connected to the power supply terminal and the audio output terminal, respectively, and the sensor microphone output protection circuit includes:
the detection end of the voltage detection module is connected with the power supply end;
the output end of the voltage detection module is electrically connected with the controlled end of the low-power trigger module;
the controlled end of the switch module is electrically connected with the low-power trigger module, and the switch module is used for controlling the output of the amplification output circuit or stopping the output;
the voltage detection module is used for detecting the power supply voltage accessed by the power end and outputting a corresponding voltage detection signal;
the low-power trigger module is configured to output a turn-off signal to control the switch module to act so that the amplification output circuit stops outputting when the voltage of the voltage detection signal is lower than a preset low-power voltage.
Optionally, the voltage detection module includes: the first end of the first resistor is connected with the power supply end, the second end of the first resistor is connected with the second resistor, and the second end of the second resistor is grounded.
Optionally, the low-power triggering module includes: the circuit comprises a third resistor, a first switch tube, a first phase inverter and a second phase inverter, wherein the first end of the third resistor is connected with the power supply end, the second end of the third resistor and the input end of the first switch tube are respectively connected with the input end of the second phase inverter, the output end of the second phase inverter is connected with the input end of the first phase inverter, the controlled end of the first switch tube is connected with the second end of the first resistor, and the output end of the first switch tube is grounded.
Optionally, the amplifying output circuit includes a BIAS module, a second switch tube and a third switch tube, the BIAS module is respectively connected to the controlled end of the second switch tube and the controlled end of the third switch tube, the input end of the second switch tube is connected to the power supply end, the output end of the third switch tube is grounded, the output end of the second switch tube and the input end of the third switch tube are respectively connected to the audio output end, and the switch module includes: a fourth switching tube and a fifth switching tube;
the input end of the fourth switching tube is electrically connected with the BIAS module, the output end of the fourth switching tube is connected with the controlled end of the second switching tube, and the controlled end of the fourth switching tube is connected with the output end of the first phase inverter; the input end of the fifth switch tube is electrically connected with the BIAS module, the output end of the fifth switch tube is connected with the controlled end of the third switch tube, and the controlled end of the fifth switch tube is connected with the input end of the first phase inverter.
Optionally, the switch module further includes: a sixth switching tube and a seventh switching tube;
the input end of the sixth switching tube is connected with the power supply end, the output end of the sixth switching tube is connected with the controlled end of the second switching tube, and the controlled end of the sixth switching tube is connected with the input end of the first phase inverter;
the input end of the seventh switching tube is connected with the controlled end of the third switching tube, the output end of the seventh switching tube is grounded, and the controlled end of the seventh switching tube is connected with the output end of the first phase inverter.
Optionally, the sensor microphone output protection circuit further includes:
the signal enhancement module is respectively connected with the low-power trigger module and the controlled end of the switch module;
and the signal enhancement module is used for enhancing the signal intensity of the turn-off signal and then outputting the enhanced turn-off signal.
Optionally, the sensor microphone output protection circuit further includes:
the voltage pull-down module is electrically connected with the voltage detection module and the low-power trigger module respectively;
and the voltage pull-down module is used for pulling down the voltage of the voltage detection signal when the turn-off signal is received.
Optionally, the sensor microphone output protection circuit further includes:
the signal enhancement module is respectively connected with the low-power trigger module and the controlled end of the switch module;
the signal enhancement module is used for enhancing the signal intensity of the turn-off signal and then outputting the enhanced turn-off signal;
the signal enhancement module comprises a third phase inverter and a fourth phase inverter, wherein the input end of the fourth phase inverter is connected with the input end of the first switch tube, the input end of the third phase inverter is connected with the output end of the fourth phase inverter, and the output end of the third phase inverter is connected with the input end of the second phase inverter.
Optionally, the sensor microphone output protection circuit further includes:
the voltage pull-down module is electrically connected with the voltage detection module and the low-power trigger module respectively;
the voltage pull-down module is used for pulling down the voltage of the voltage detection signal when the turn-off signal is received;
the voltage pull-down module comprises a fourth resistor and an eighth switch tube, a first end of the fourth resistor and an input end of the eighth switch tube are respectively connected with the power supply end, a second end of the fourth resistor and an output end of the eighth switch tube are respectively connected with a first end of the first resistor, and a controlled end of the eighth switch tube is connected with an output end of the third phase inverter.
The invention also provides a sensor microphone, which comprises an amplification output circuit, a power supply end, an audio output end and the sensor microphone output protection circuit, wherein the sensor microphone output protection circuit is electrically connected with the power supply end and the amplification output circuit respectively.
The invention comprises a voltage detection module, a low-power trigger module and a switch module. The switch module is used for controlling the output or stopping the output of the amplification output circuit, the voltage detection module is used for detecting the power supply voltage accessed by the power supply end and outputting a corresponding voltage detection signal, and the low-power trigger module is configured to output a turn-off signal to control the switch module to act when the voltage of the voltage detection signal is lower than a preset low-power voltage, so that the amplification output circuit stops outputting. Therefore, in practical application, when the voltage of the sensor microphone is insufficient during power-on or the battery is exhausted, the amplifying and outputting circuit can be controlled to stop outputting in time, so that the audio output end is changed into a high-resistance state, the sensor microphone is in a mute state, abnormal audio signals output by the sensor microphone are eliminated, and a user cannot hear unpleasant sounds. Meanwhile, the amplifying output circuit is controlled to stop outputting in low power, so that the amplifying output circuit is ensured not to have leakage current, and the working stability and reliability of the amplifying output circuit are effectively ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a block diagram of a sensor microphone output protection circuit according to an embodiment of the present invention;
FIG. 2 is a block diagram of another embodiment of a sensor microphone output protection circuit according to the present invention;
FIG. 3 is a block diagram of a sensor microphone output protection circuit according to another embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of an embodiment of a sensor microphone output protection circuit according to the present invention;
FIG. 5 is a schematic circuit diagram of another embodiment of the sensor microphone output protection circuit according to the present invention;
fig. 6 is a specific circuit diagram of a sensor microphone output protection circuit according to another embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
20 | Low- |
| 30 | |
40 | |
| 50 | Voltage pull-down module |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
With the expansion of consumer markets such as modern smart phones, TWS smart headsets, and smart homes, the demand for a sensor microphone (MEMS-Micro Electro Mechanical System) is relatively greatly increased. However, when the conventional sensor microphone is powered up, the voltage is insufficient or the battery is attenuated and discharged, which may cause failure of a plurality of internal modules, which may cause an abnormal output audio signal, and thus may cause a user to hear an unpleasant sound.
Therefore, the invention provides an output protection circuit of a sensor microphone, which is applied to the sensor microphone.
Referring to fig. 1, in an embodiment of the present invention, a sensor microphone output protection circuit includes:
the voltage detection module 10, the detection end of the voltage detection module 10 is connected with the power supply end;
the output end of the voltage detection module 10 is electrically connected with the controlled end of the low-power trigger module 20;
the controlled end of the switch module 30 is electrically connected with the low-power trigger module 20, and the switch module 30 is used for controlling the output of the amplification output circuit or stopping the output;
the voltage detection module 10 is used for detecting the power supply voltage accessed by the power supply end and outputting a corresponding voltage detection signal;
and the low-power trigger module 20 is configured to output a turn-off signal to control the switch module 30 to act so that the amplifying output circuit stops outputting when the voltage of the voltage detection signal is lower than a preset low-power voltage.
In this embodiment, optionally, the voltage detection module 10 may be implemented by a resistor divider circuit, the low-voltage trigger module 20 may be implemented by a main controller, for example, an MCU, a DSP (Digital Signal processor), an FPGA (Field Programmable Gate Array), and the like, and the main controller may be provided therein with an ADC detection module, a calculation module, and a processing module. In this way, the main controller can determine the voltage value of the power supply voltage accessed by the current power supply end by detecting the voltage value divided and output by the resistance voltage dividing circuit and the resistance ratio in the resistance voltage dividing circuit. The switch module 30 may adopt a switch tube such as a MOS tube, a triode, an IGBT tube, or a relay, and the switch module 30 may be disposed in the content of the amplification output circuit, for example, referring to fig. 4, the switch module 30 is disposed between the BIAS module and a push-pull circuit composed of the second switch tube and the third switch tube, so that when the main controller determines that the voltage of the voltage detection signal is lower than the preset low voltage, that is, it can be determined that the current power supply voltage is in an abnormal state, the switch module 30 is controlled to be in a disconnection state by outputting a turn-off signal, and the amplification output circuit is controlled to stop outputting, so that the audio output end is in a high impedance state. The preset low-voltage can be set by research personnel according to the resistance value ratio in the resistance voltage dividing circuit and the voltage value when the power supply voltage is in an abnormal state. Similarly, when the main controller determines that the voltage of the voltage detection signal is higher than the preset low voltage, it may be determined that the current power supply voltage is in a normal state, and then the output close signal controls the switch module 30 to be in a close state, so as to control the amplification output circuit to normally output the audio signal through the audio output terminal.
Alternatively, referring to fig. 4, the voltage detection module 10 includes: first resistance R1, second resistance R2, first end and the power end VDD of first resistance R1 are connected, and the second end and the second resistance R2 of first resistance R1 are connected, and the second end ground of second resistance R2.
The low-power trigger module 20 includes: the power supply circuit comprises a third resistor R3, a first switch tube Q1, a first phase inverter F1 and a second phase inverter F2, wherein the first end of the third resistor R3 is connected with a power supply end VDD, the second end of the third resistor R3 and the input end of a first switch tube Q1 are respectively connected with the input end of a second phase inverter F2, the output end of a second phase inverter F2 is connected with the input end of a first phase inverter F1, the controlled end of the first switch tube Q1 is connected with the second end of the first resistor, and the output end of the first switch tube Q1 is grounded.
The amplifying output circuit comprises a BIAS module, a second switch tube Q2 and a third switch tube Q3, the BIAS module is respectively connected with a controlled end of the second switch tube Q2 and a controlled end of the third switch tube Q3, an input end of the second switch tube Q2 is connected with a power supply end VDD, an output end of the third switch tube Q3 is grounded, an output end of the second switch tube Q2 and an input end of the third switch tube Q3 are respectively connected with an audio output end, and the switch module 30 comprises: a fourth switching tube Q4 and a fifth switching tube Q5;
an input end BIAS module of a fourth switching tube Q4 is electrically connected, an output end of the fourth switching tube Q4 is connected with a controlled end of a second switching tube Q2, and a controlled end of a fourth switching tube Q4 is connected with an output end of a first phase inverter F1; an input end BIAS module of the fifth switching tube Q5 is electrically connected, an output end of the fifth switching tube Q5 is connected with a controlled end of the third switching tube Q3, and the controlled end of the fifth switching tube Q5 is connected with an input end of the first phase inverter F1.
The first switch tube Q1, the third switch tube Q3, and the fifth switch tube Q5 are NMOS tubes, the second switch tube Q2 and the fourth switch tube Q4 are PMOS tubes, and the preset low voltage is the starting voltage of the first switch tube Q1, and the resistance values of the first resistor R1 and the second resistor R2 can be set by the starting voltage of the first switch tube Q1 of research personnel, so that when the power supply voltage is in an abnormal state, the voltage value of the voltage detection signal cannot reach the starting voltage of the first switch tube Q1.
The normal power supply voltage of VDD is 3V, the turn-on voltage is 0.7V, and the resistances of the first resistor R1 and the second resistor R2 are 100K Ω.
When the supply voltage of VDD is 3V, and the first resistor R1 and the second resistor R2 divide the voltage, a voltage detection signal with a voltage of 1.5V is output, so that the first switch tube Q1 can be turned on, and the second end of the third resistor R3 is directly grounded, at this time, the level of the second end of the third resistor R3 is low, and after passing through the first inverter F1, the voltage detection signal is converted into a high level signal, and the high level signal is output to the controlled end of the fifth switch tube Q5 through the second output terminal VL, so that the fifth switch tube Q5 is in a conducting state. Meanwhile, after passing through the second inverter F1, the first output terminal VLB outputs a low level signal to the controlled terminal of the fourth switching transistor Q4, so that the fourth switching transistor Q4 is in a conducting state. The close signal is a low level signal output through the first output terminal VLB and a high level signal output through the second output terminal VL.
When the supply voltage of VDD is abnormal, for example, 1.2V, the first resistor R1 and the second resistor R2 divide the voltage, and then output a voltage detection signal with a voltage of 0.6V, so that the first switch tube Q1 is in an off state. At this time, the voltage of the second end of the third resistor R3 is pulled up to the voltage value of the power supply voltage, that is, 1.2V, and outputs a low level signal (0V) through the second output terminal VL after passing through the first inverter F1, and outputs a high level signal (1.2V) through the first output terminal VLB after passing through the second inverter F2, and at this time, the fourth switch tube Q4 and the fifth switch tube Q5 are both in an off state, so that the BIAS module cannot control the second switch tube Q2 and the third switch tube Q3, and the output operation of the amplification output circuit is stopped, and the audio output terminal is in a high impedance state. The shutdown signal is a low level signal output through the first output terminal VL and a high level signal output through the second output terminal VLB. Therefore, in practical application, when the voltage of the sensor microphone is insufficient during power-on or the battery is exhausted, the amplifying output circuit can be controlled to stop outputting in time, the audio output end is changed into a high-resistance state, the sensor microphone is in a mute state, abnormal audio signals output by the sensor microphone are eliminated, and a user cannot hear unpleasant sound. Meanwhile, the amplifying output circuit is controlled to stop outputting in low power, so that the amplifying output circuit is ensured not to have leakage current, and the working stability and reliability of the amplifying output circuit are effectively ensured.
In another embodiment, referring to fig. 5, the switch module 30 may further include a sixth switch tube Q6 and a seventh switch tube Q7;
the input end of a sixth switching tube Q6 is connected with a power supply end VDD, the output end of the sixth switching tube Q6 is connected with the controlled end of a second switching tube Q2, and the controlled end of a sixth switching tube Q6 is connected with the input end of a first phase inverter F1;
the input end of the seventh switching tube Q7 is connected with the controlled end of the third switching tube Q3, the output end of the seventh switching tube Q7 is grounded, and the controlled end of the seventh switching tube Q7 is connected with the output end of the first inverter.
As can be seen from the above, when the power supply voltage is normal, the low level signal output by the first output terminal VLB and the high level signal output by the second output terminal VL make the sixth switching tube Q6 and the seventh switching tube Q7 in the off state, and the normal operation of the BIAS module, that is, the normal output operation of the amplifying output circuit, is not affected.
When the power supply voltage is abnormal, the high level signal output by the first output terminal VLB and the low level signal output by the second output terminal VL may cause the sixth switching tube Q6 and the seventh switching tube Q7 to be in an on state, so as to pull up the voltage at the controlled terminal of the second switching tube Q2 to the power supply voltage (i.e., a high level voltage), and pull down the voltage at the controlled terminal of the third switching tube Q3 to ground (i.e., a low level voltage), so as to ensure that the second switching tube Q2 and the third switching tube Q3 can be completely controlled to be in an off state, and meanwhile, if the circuit line is disconnected, the signal output by the first output terminal VLB may not be normally output to the controlled terminal of the fourth switching tube Q4. At this time, the sixth switching tube Q6 can be turned on only by the low level signal output from the second output terminal VL, so that the second switching tube Q2 is kept in the off state, and the amplifying output circuit can stop the output operation. Therefore, the arrangement effectively improves the reliability and stability of the work of the sensor microphone output protection circuit.
The present invention includes a voltage detection module 10, a low power trigger module 20, and a switch module 30. The switch module 30 is configured to control the output or stop the output of the amplification output circuit, the voltage detection module 10 is configured to detect a power supply voltage accessed by a power supply terminal and output a corresponding voltage detection signal, and the low-power trigger module 20 is configured to output a shutdown signal to control the switch module 30 to operate when the voltage of the voltage detection signal is lower than a preset low-power voltage, so that the amplification output circuit stops outputting. Therefore, in practical application, when the voltage of the sensor microphone is insufficient during power-on or the battery is exhausted, the amplifying and outputting circuit can be controlled to stop outputting in time, so that the audio output end is changed into a high-resistance state, the sensor microphone is in a mute state, abnormal audio signals output by the sensor microphone are eliminated, and a user cannot hear unpleasant sounds. Meanwhile, the amplifying output circuit is controlled to stop outputting in low power, so that the amplifying output circuit is ensured not to have leakage current, and the working stability and reliability of the amplifying output circuit are effectively ensured.
Referring to fig. 2, in an embodiment of the present invention, the sensor microphone output protection circuit further includes:
the signal enhancement module 40, the signal enhancement module 40 is respectively connected with the controlled ends of the low-power trigger module 20 and the switch module 30;
and the signal enhancement module 40 is used for enhancing the signal strength of the shutdown signal and then outputting the shutdown signal.
In this embodiment, the signal enhancement module 40 may be implemented by an amplifier, a buffer, or the like, and the signal enhancement module 40 may provide a shaping function for the signal to enhance the signal strength of the shutdown signal and then output the shutdown signal to the switch module 30, so that the shutdown signal is not depleted due to parasitic capacitance on a wiring line during transmission. Through the arrangement, the signal intensity of the turn-off signal can be effectively improved, and the working stability and reliability of the sensor microphone output protection circuit are further improved.
Optionally, in an embodiment, referring to fig. 6, the signal enhancement module 40 includes a third inverter F3 and a fourth inverter F4, an input terminal of the fourth inverter F3 is connected to an input terminal of the first switch Q1, an input terminal of the third inverter F3 is connected to an output terminal of the fourth inverter F4, and an output terminal of the third inverter F3 is connected to an input terminal of the second inverter F2.
In the present embodiment, the first inverter F1 and the second inverter F2 constitute one set of buffers, and the third inverter F3 and the fourth inverter F4 constitute another set of buffers;
as can be seen from the foregoing embodiments, when the voltage of the voltage detection signal is higher than the preset low voltage, the first switch tube Q1 can be turned on, and output a turn-off signal as a low-level signal, and after the signal is enhanced by the fourth inverter F4 and the third inverter F3, the enhanced low-level signal is converted by the second inverter F2, passes through the second output terminal VL to the controlled terminal of the fifth switch tube Q5 and the controlled terminal of the seventh switch tube Q7, and is converted by the first inverter F1, and passes through the first output terminal VLB to the controlled terminal of the fourth switch tube Q4 and the controlled terminal of the sixth switch tube Q6, so as to disconnect the connection path between the BIAS module and the controlled terminal of the second switch tube Q2 and the controlled terminal of the third switch tube Q3 in the amplification output circuit, thereby making the audio output terminal in a high-impedance state.
Referring to fig. 3, in an embodiment of the present invention, the sensor microphone output protection circuit further includes:
the voltage pull-down module 50, the voltage pull-down module 50 is electrically connected with the voltage detection module 10 and the low-power trigger module 20 respectively;
and the voltage pull-down module 50 is configured to pull down the voltage of the voltage detection signal when receiving the shutdown signal.
In this embodiment, referring to fig. 6, the voltage pull-down module 50 includes a fourth resistor R4 and an eighth switch Q8, a first end of the fourth resistor R4 and an input end of the eighth switch Q8 are respectively connected to the power supply terminal VDD, a second end of the fourth resistor R4 and an output end of the eighth switch Q8 are respectively connected to the first end of the first resistor R1, and a controlled end of the eighth switch Q8 is connected to an output end of the third inverter F3.
The eighth switching tube Q8 is a PMOS tube, the first switching tube Q1 is an NMOS tube, VDD normal voltage is 3V, low voltage is 1.2V, and resistance values of the first resistor R1, the second resistor R2, and the third resistor R3 are all 100K for example;
when the voltage of VDD is normal, the first resistor R1 and the second resistor R2 divide the voltage of VDD and output a voltage detection signal with a voltage of 1.5V to control the Q1 to be in a conducting state, so that the level of the second end of the third resistor R3 is low, and after passing through a set of buffers, a low level signal is output to the controlled end of the eighth switch Q8, so that the eighth switch Q8 is in a conducting state, at this time, the fourth resistor R4 is shorted by the eighth switch Q8 in the conducting state, otherwise, the first switch Q1 is in the conducting state, that is, the normal operation of the amplification output circuit is not affected.
When the voltage of VDD is abnormal, for example, the voltage is low voltage 1.2V, at this time, due to the low voltage, the first switching tube Q1 is in a closed state, at this time, the voltage of the second end of the third resistor R3 is 1.2V, after passing through a set of buffers, the eighth switching tube Q8 is controlled to be in an open state, at this time, the fourth resistor R4, the first resistor R1 and the second resistor R2 divide the voltage together, the voltage of the second end of the first resistor R1 is further pulled down, that is, at an instant when the voltage of VDD is abnormal, the voltage of the controlled end of the first switching tube Q1 is pulled down to 0.3V, so that it can be completely ensured that the first switching tube Q1 is completely turned off. Therefore, through the arrangement, when the power supply voltage of the power supply end VDD is low, the first switch tube Q1 can be ensured not to be conducted, the situation that the first switch tube Q1 is possibly in a conducting state after abnormal voltage is divided by the first resistor R1 and the second resistor R2 is prevented, and the working reliability and stability of the sensor microphone output protection circuit are effectively improved.
The invention also provides a sensor microphone, which comprises an amplification output circuit, a power supply end, an audio output end and the output protection circuit of any one of the sensor microphones, wherein the output protection circuit of the sensor microphone is electrically connected with the power supply end and the amplification output circuit respectively.
The amplifying output circuit comprises a BIAS module, a second switching tube and a third switching tube, wherein the BIAS module is respectively connected with a controlled end of the second switching tube and a controlled end of the third switching tube, an input end of the second switching tube is connected with a power supply end, an output end of the third switching tube is grounded, and an output end of the second switching tube and an input end of the third switching tube are respectively connected with an audio output end.
It should be noted that, because the sensor microphone of the present invention is based on the sensor microphone output protection circuit, the embodiment of the sensor microphone of the present invention includes all technical solutions of all embodiments of the sensor microphone output protection circuit, and the achieved technical effects are also completely the same, and are not described herein again.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A sensor microphone output protection circuit is applied to a sensor microphone, the sensor microphone comprises an amplification output circuit, a power end and an audio output end, the amplification output circuit is respectively electrically connected with the power end and the audio output end, and the sensor microphone output protection circuit is characterized by comprising:
the detection end of the voltage detection module is connected with the power supply end;
the output end of the voltage detection module is electrically connected with the controlled end of the low-power trigger module;
the controlled end of the switch module is electrically connected with the low-power trigger module, and the switch module is used for controlling the output of the amplification output circuit or stopping the output;
the voltage detection module is used for detecting the power supply voltage accessed by the power end and outputting a corresponding voltage detection signal;
the low-power trigger module is configured to output a turn-off signal to control the switch module to act so that the amplification output circuit stops outputting when the voltage of the voltage detection signal is lower than a preset low-power voltage.
2. The sensor microphone output protection circuit of claim 1, wherein the voltage detection module comprises: the first end of the first resistor is connected with the power supply end, the second end of the first resistor is connected with the second resistor, and the second end of the second resistor is grounded.
3. The sensor microphone output protection circuit of claim 2, wherein the low-power trigger module comprises: the power supply circuit comprises a third resistor, a first switch tube, a first phase inverter and a second phase inverter, wherein the first end of the third resistor is connected with the power supply end, the second end of the third resistor and the input end of the first switch tube are respectively connected with the input end of the second phase inverter, the output end of the second phase inverter is connected with the input end of the first phase inverter, the controlled end of the first switch tube is connected with the second end of the first resistor, and the output end of the first switch tube is grounded.
4. The output protection circuit of claim 3, wherein the amplifying output circuit comprises a BIAS module and a second switch tube and a third switch tube, the BIAS module is connected to the controlled terminal of the second switch tube and the controlled terminal of the third switch tube, respectively, the input terminal of the second switch tube is connected to the power terminal, the output terminal of the third switch tube is grounded, and the output terminal of the second switch tube and the input terminal of the third switch tube are connected to the audio output terminal, respectively, wherein the switch module comprises: a fourth switching tube and a fifth switching tube;
the input end of the fourth switching tube is electrically connected with the BIAS module, the output end of the fourth switching tube is connected with the controlled end of the second switching tube, and the controlled end of the fourth switching tube is connected with the output end of the first phase inverter; the input end of the fifth switch tube is electrically connected with the BIAS module, the output end of the fifth switch tube is connected with the controlled end of the third switch tube, and the controlled end of the fifth switch tube is connected with the input end of the first phase inverter.
5. The sensor microphone output protection circuit of claim 4, wherein the switch module further comprises: a sixth switching tube and a seventh switching tube;
the input end of the sixth switching tube is connected with the power supply end, the output end of the sixth switching tube is connected with the controlled end of the second switching tube, and the controlled end of the sixth switching tube is connected with the input end of the first phase inverter;
the input end of the seventh switching tube is connected with the controlled end of the third switching tube, the output end of the seventh switching tube is grounded, and the controlled end of the seventh switching tube is connected with the output end of the first phase inverter.
6. The sensor microphone output protection circuit of claim 1, further comprising:
the signal enhancement module is respectively connected with the low-power trigger module and the controlled end of the switch module;
and the signal enhancement module is used for enhancing the signal intensity of the turn-off signal and then outputting the enhanced turn-off signal.
7. The sensor microphone output protection circuit of claim 1, further comprising:
the voltage pull-down module is electrically connected with the voltage detection module and the low-power trigger module respectively;
and the voltage pull-down module is used for pulling down the voltage of the voltage detection signal when the turn-off signal is received.
8. The sensor microphone output protection circuit of claim 5, further comprising:
the signal enhancement module is respectively connected with the low-power trigger module and the controlled end of the switch module;
the signal enhancement module is used for enhancing the signal intensity of the turn-off signal and then outputting the enhanced turn-off signal;
the signal enhancement module comprises a third phase inverter and a fourth phase inverter, wherein the input end of the fourth phase inverter is connected with the input end of the first switch tube, the input end of the third phase inverter is connected with the output end of the fourth phase inverter, and the output end of the third phase inverter is connected with the input end of the second phase inverter.
9. The sensor microphone output protection circuit of claim 8, wherein the sensor microphone output protection circuit further comprises:
the voltage pull-down module is electrically connected with the voltage detection module and the low-power trigger module respectively;
the voltage pull-down module is used for pulling down the voltage of the voltage detection signal when the turn-off signal is received;
the voltage pull-down module comprises a fourth resistor and an eighth switch tube, a first end of the fourth resistor and an input end of the eighth switch tube are respectively connected with the power supply end, a second end of the fourth resistor and an output end of the eighth switch tube are respectively connected with a first end of the first resistor, and a controlled end of the eighth switch tube is connected with an output end of the third phase inverter.
10. A sensor microphone, characterized in that the sensor microphone comprises an amplification output circuit, a power supply terminal and an audio output terminal, and a sensor microphone output protection circuit according to any one of claims 1 to 9, which is electrically connected to the power supply terminal and the amplification output circuit, respectively.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210186612.9A CN114567837B (en) | 2022-02-28 | 2022-02-28 | Sensor microphone output protection circuit and sensor microphone |
| PCT/CN2022/141623 WO2023160202A1 (en) | 2022-02-28 | 2022-12-23 | Sensor microphone output protection circuit and sensor microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210186612.9A CN114567837B (en) | 2022-02-28 | 2022-02-28 | Sensor microphone output protection circuit and sensor microphone |
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| CN114567837A true CN114567837A (en) | 2022-05-31 |
| CN114567837B CN114567837B (en) | 2024-04-26 |
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| CN202210186612.9A Active CN114567837B (en) | 2022-02-28 | 2022-02-28 | Sensor microphone output protection circuit and sensor microphone |
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| CN (1) | CN114567837B (en) |
| WO (1) | WO2023160202A1 (en) |
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| WO2023160202A1 (en) * | 2022-02-28 | 2023-08-31 | 歌尔微电子股份有限公司 | Sensor microphone output protection circuit and sensor microphone |
| CN117977784A (en) * | 2024-03-28 | 2024-05-03 | 深圳市力生美半导体股份有限公司 | Switching power supply circuit, power management device and control method thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2023160202A1 (en) | 2023-08-31 |
| CN114567837B (en) | 2024-04-26 |
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