WO2023020362A1 - Appareil de détection de fluide et son procédé de commande, et dispositif électronique - Google Patents

Appareil de détection de fluide et son procédé de commande, et dispositif électronique Download PDF

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Publication number
WO2023020362A1
WO2023020362A1 PCT/CN2022/111843 CN2022111843W WO2023020362A1 WO 2023020362 A1 WO2023020362 A1 WO 2023020362A1 CN 2022111843 W CN2022111843 W CN 2022111843W WO 2023020362 A1 WO2023020362 A1 WO 2023020362A1
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WIPO (PCT)
Prior art keywords
thermistor
voltage
ambient temperature
voltage source
wire
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PCT/CN2022/111843
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English (en)
Chinese (zh)
Inventor
李英明
陈森俊
朱梦尧
李珠莹
陈家熠
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华为技术有限公司
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Publication of WO2023020362A1 publication Critical patent/WO2023020362A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
    • G01F1/688—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow using a particular type of heating, cooling or sensing element
    • G01F1/69—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow using a particular type of heating, cooling or sensing element of resistive type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements

Definitions

  • the present application relates to the technical field of fluid measurement, in particular to a fluid detection device, a control method, and electronic equipment.
  • the vector microphone (acoustic vector sensor, AVS) has the characteristics of good frequency and space consistency of sound signal collection, strong noise suppression ability, and good long-distance sound pickup effect. It is widely used in smart terminal sound pickup technology.
  • Sensitivity is an important technical index to measure the above-mentioned microphones, such as vector microphones.
  • vector microphones are usually calibrated for sensitivity before they leave the factory.
  • the performance (such as sensitivity) of the vector microphone will be affected by the external environment (such as temperature) when the user's use environment is different, resulting in large fluctuations. In this way, when the user uses the vector microphone, it is difficult to ensure that the vector microphone works in an optimal performance state, thereby degrading the user experience.
  • Embodiments of the present application provide a fluid detection device, a control method, and electronic equipment, which are used to reduce fluctuations in the performance of a fluid detection device such as a vector microphone as the ambient temperature changes.
  • the embodiment of the present application provides a fluid detection device.
  • the fluid detection device includes a voltage source, a channel for fluid flow, at least one heating element, at least one thermistor, and a controller.
  • the heating element is electrically connected to the voltage source.
  • the thermistor is electrically connected to the voltage source; wherein, when the fluid flows in the channel, the fluid flows through the thermistor, so that the thermistor can detect the flow (such as flow rate) of fluid such as gas.
  • the thermistor is used to sense the ambient temperature of the thermistor, and the ambient temperature is related to the temperature of the thermistor itself.
  • the voltage source When the ambient temperature of the thermistor is the first ambient temperature, the voltage source at least outputs the first voltage to the thermistor; when the ambient temperature of the thermistor is the second ambient temperature, the voltage source outputs at least the first voltage to the thermistor The resistor outputs the second voltage.
  • the first ambient temperature is different from the second ambient temperature
  • the first voltage is different from the second voltage.
  • at least the first voltage can be applied to the thermistor through the voltage source, so that the fluid detection device has higher sensitivity and good signal-to-noise ratio.
  • the use environment of the fluid detection device changes, for example, when the temperature changes from the above-mentioned first ambient temperature to the second ambient temperature, at least a second voltage can be applied to the thermistor through the above-mentioned voltage source, so that the fluid detection device can still maintain a higher temperature. Sensitivity and good signal-to-noise ratio.
  • the first ambient temperature is higher than the second ambient temperature.
  • the first voltage is greater than the second voltage. In this way, when the ambient temperature drops from the first ambient temperature to the second ambient temperature, at least the voltage applied to the thermistor can be reduced from the first voltage to the second voltage. Alternatively, when the ambient temperature increases from the second ambient temperature to the first ambient temperature T1, at least the voltage applied to the thermistor can be increased from the second voltage to the first voltage. In this way, by adjusting at least the voltage applied to the thermistor, fluctuations in the performance of the fluid detection device due to the influence of the ambient temperature are reduced.
  • the fluid detection device further includes a controller.
  • the controller is electrically connected to a voltage source.
  • the thermistor is used to generate a first signal corresponding to the temperature of the thermistor; the controller is used to output a voltage control signal to the voltage source according to the first signal, so as to control the output voltage of the voltage source.
  • the controller controls the voltage source to output the first voltage; when the ambient temperature of the thermistor is the second ambient temperature, the controller controls the voltage source to output the second voltage. Voltage.
  • the controller can be a part of the application processor in the electronic equipment with the fluid detection device, or an independent digital signal processor.
  • the controller includes a processor circuit and at least one control component.
  • the processor circuit is configured to output a voltage control instruction according to the first signal.
  • the control assembly may include a voltage control circuit.
  • the voltage control circuit is electrically connected to the voltage source and the processor circuit.
  • the voltage control circuit is used for outputting a voltage control signal to the voltage source to control the voltage output by the voltage source according to the voltage control command.
  • the processor circuit can obtain the resistance of the thermistor according to the first signal, and output a voltage control instruction to the voltage control circuit according to the resistance, so that the voltage control circuit can control the output voltage of the voltage source.
  • the control assembly further includes a current acquisition circuit.
  • the current acquisition circuit is electrically connected with the voltage source and the processor circuit.
  • the current collecting circuit is used for collecting the current flowing through the thermistor and outputting it to the processor circuit.
  • the processor circuit can collect the current I output from the voltage source to the thermistor and the voltage U output by the voltage source through the current acquisition circuit to obtain the resistance R of the thermistor.
  • the ambient temperature is calculated according to the resistance, and a voltage matching the ambient temperature is provided to the thermistor through the voltage control circuit to control the voltage, so as to reduce fluctuations in the performance of the fluid detection device affected by the ambient temperature.
  • the processor circuit before acquiring the first signal, is further configured to receive a user's first mode selection operation, and output a voltage control instruction to the voltage control circuit in response to the first mode selection operation, so that the voltage source outputs The first mode initial voltage.
  • the processor circuit before acquiring the first signal, is further configured to receive the user's second mode selection operation, and output a voltage control instruction to the voltage control circuit in response to the second mode selection operation, so that the voltage source outputs the second mode initial Voltage.
  • the initial voltage of the first mode is smaller than the initial voltage of the second mode.
  • the working modes of the above-mentioned fluid detection device may include a first mode, such as a power-saving mode, and a second mode, such as a high-performance mode.
  • the processor circuit can operate the control voltage source to provide different voltages to the thermistor according to the user's mode selection, so as to meet the requirements of different modes.
  • the initial voltage of the first mode is 2V ⁇ 4V.
  • the initial voltage U1 in the first mode is less than 2V, the voltage applied to the thermistor is too small, so that the sensitivity of the fluid detection device is too low, which affects the performance of the fluid detection device.
  • the initial voltage U1 in the first mode is greater than 4V, the voltage applied to the thermistor is too large, which increases the power consumption of the fluid detection device and reduces the power saving effect.
  • the initial voltage U1 in the first mode may be 2V, 2.5V, 3V, 3.5V or 4V.
  • the initial voltage of the second mode is 5V ⁇ 12V.
  • the aforementioned second mode initial voltage U2 may be 5V, 6V, 7V, 8V, 9V, 10V, 11V or 12V.
  • the at least one thermistor includes a first thermistor and a second thermistor.
  • the first thermistor and the second thermistor serve as two branches of the bridge circuit respectively.
  • the voltage difference ⁇ u 0 output by the bridge circuit will change.
  • the resistance change of the first thermistor and the second thermistor can be converted into a voltage difference ⁇ u 0 . Therefore, sound information can be obtained by obtaining the above-mentioned voltage difference ⁇ u 0 .
  • the fluid detection device further includes a first resistor, a second resistor and an operational amplifier.
  • the first resistor and the first thermistor are connected in series between the voltage source and the ground terminal; the second resistor and the second thermistor are connected in series between the voltage source and the ground terminal.
  • the first resistor is electrically connected between the first thermistor and the ground terminal.
  • the second resistor is electrically connected between the second thermistor and the ground terminal.
  • the first input end of the operational amplifier is electrically connected between the first resistor and the first thermistor, and the second input end of the operational amplifier is electrically connected between the second resistor and the second thermistor.
  • the first thermistor, the second thermistor, the first resistor and the second resistor may form a bridge circuit.
  • the resistance values of the above-mentioned first resistor and the second resistor are constant and fixed.
  • the voltage difference ⁇ u 0 output by the bridge circuit will change.
  • the change in resistance of the first thermistor and the second thermistor is converted into a voltage difference ⁇ u 0 . Therefore, sound information can be obtained by obtaining the above-mentioned voltage difference ⁇ u 0 .
  • the operational amplifier is used to amplify the voltage difference ⁇ u 0 , so that the signal obtained by the fluid detection device, such as the microphone module, can be more easily identified.
  • the fluid detection device further includes a switch and a comparator.
  • the first input end of the comparator is electrically connected to one end of the first thermistor or the second thermistor away from the voltage source, the second input end of the comparator is used to receive a reference voltage, and the output end of the comparator outputs a control signal.
  • the switch is connected in series with the heating element, the gate terminal of the switch receives the control signal, and the switch is selectively turned on based on the control signal.
  • the comparator is used to control the switch to turn off if the voltage of the first input end of the comparator is greater than the reference voltage, so as to avoid the ambient temperature or the temperature of the thermistor from being too high (or the temperature is higher than the first warning temperature).
  • the heating element and the ground terminal are in a disconnected state, and no current flows through the heating element, so that the heating element no longer provides a temperature field to the first thermistor and the second thermistor, thereby reducing the temperature of the first thermistor. resistance and a second thermistor for temperature purposes.
  • the control switch is turned on.
  • the heating element is electrically connected to the ground terminal, and the current flows through the heating element, so that the heating element provides a temperature field to the first thermistor and the second thermistor, preventing the ambient temperature or the temperature of the thermistor from being too high. low (or the temperature is lower than the second warning temperature), to improve the sensitivity of the fluid detection device.
  • the fluid detection device further includes at least one stage of noise reduction circuit mode converter and digital signal processor.
  • the noise reduction circuit is electrically connected between the first thermistor and the first input terminal of the operational amplifier, and the noise reduction circuit is also electrically connected between the second thermistor and the second input terminal of the operational amplifier.
  • the noise reduction circuit is used to perform noise reduction processing on the voltage difference ⁇ u 0 output by the bridge circuit where the first thermistor and the second thermistor are located.
  • the input end of the analog-to-digital converter is electrically connected to the output end of the operational amplifier, and is used for converting the analog signal output by the operational amplifier into a digital signal.
  • the at least one thermistor includes a first thermistor and a second thermistor.
  • the first thermistor and the second thermistor serve as two branches of the bridge circuit respectively.
  • the voltage source includes three sub-voltage sources, namely a first sub-voltage source, a second sub-voltage source and a third sub-voltage source.
  • the first thermistor is electrically connected to the first sub-voltage source
  • the second thermistor is electrically connected to the second sub-voltage source
  • the heating element is electrically connected to the third sub-voltage source.
  • the controller includes three control components, namely a first control component, a second control component and a third control component.
  • the first control component is electrically connected to the first sub-voltage source.
  • the second control assembly is electrically connected to the second sub-voltage source.
  • the third control assembly is electrically connected to the third sub-voltage source.
  • the fluid detection device further includes a temperature detector.
  • the temperature detector is electrically connected with the controller, and the temperature detector is used to collect the temperature of the thermistor, and transmit the collected result to the controller.
  • the controller can judge whether the resistance of the thermistor calculated by the processor is accurate by judging whether the temperature of the thermistor collected by the temperature detector is within the working temperature range. Next, obtain the ambient temperature where the thermistor is located through the resistor, and obtain a voltage that matches the ambient temperature. Alternatively, the controller may obtain the ambient temperature of the thermistor directly from the temperature of the thermistor collected by the temperature detector without calculating the resistance of the thermistor, and obtain a voltage matching the ambient temperature.
  • the first signal is used to characterize the resistance of the thermistor.
  • the resistance value of the thermistor wire can be used as the first signal.
  • the first signal may be an analog signal or a digital signal.
  • the material of the thermistor wire includes platinum.
  • the thermistor wire made of platinum has a higher sensitivity to changes in resistance value according to temperature changes.
  • the fluid detection device is a microphone module, and the fluid is gas.
  • the microphone module has the same technical effect as the fluid detection device provided in the foregoing embodiments, and details are not repeated here.
  • the fluid detection device further includes a base, the base includes a groove, the heating element and the thermistor are respectively arranged on both sides of the groove, and the heating element and the thermistor adopt a suspended structure, which can better Sensing the flow of fluids such as gases.
  • the groove is a channel, or the groove is a portion of a channel.
  • the embodiment of the present application provides a control method.
  • the control method is applied to a controller in a fluid detection device, which also includes a voltage source, a channel for fluid flow, at least one heating element, and at least one thermistor.
  • the heating element is electrically connected to the voltage source
  • the thermistor is electrically connected to the voltage source; wherein when the fluid flows in the channel, the fluid flows through the thermistor.
  • the above control method includes: firstly, the controller receives a first signal generated by the thermistor and corresponding to the temperature of the thermistor.
  • the controller controls the voltage source to at least output the first voltage to the thermistor according to the first signal, and when the ambient temperature of the thermistor is the first At the second ambient temperature, the controller controls the voltage source to at least output the second voltage to the thermistor according to the first signal.
  • the first ambient temperature is different from the second ambient temperature
  • the first voltage is different from the second voltage.
  • the first ambient temperature is higher than the second ambient temperature.
  • the first voltage is greater than the second voltage.
  • the method before acquiring the first signal, further includes: receiving a user's first mode selection operation, and then, in response to the first mode selection operation, the controller controls the voltage source to output the first mode initial voltage.
  • the method before acquiring the first signal, further includes: receiving a user's second mode selection operation, and then, in response to the second mode selection operation, the controller controls the voltage source to output the second mode initial voltage.
  • the initial voltage of the first mode is 2V ⁇ 4V.
  • the initial voltage of the second mode is 5V-12V.
  • the first signal is used to characterize the resistance of the thermistor.
  • the resistance value of the thermistor wire can be used as the first signal.
  • the first signal may be an analog signal or a digital signal.
  • controlling the voltage source to at least output the second voltage to the thermistor includes: first, from the first data set, obtain the resistance value corresponding to the resistance of the thermistor according to the first signal The first ambient temperature or the second ambient temperature whose range matches; wherein, the first data set includes a plurality of resistance value ranges and a plurality of ambient temperatures; a resistance value range matches an ambient temperature, and then, from the second data set In the set, obtain the first voltage that matches the ambient temperature range where the first ambient temperature is located, and control the voltage source to output the first voltage, or, from the second data set, obtain the ambient temperature range that matches the second ambient temperature matching the second voltage, and controlling the voltage source to output the second voltage; wherein, the second data set includes multiple ambient temperature
  • the above-mentioned fluid detection device may include a computer storage medium, such as a memory.
  • the memory may store the above-mentioned first data set and second data set.
  • the performance of the fluid detection device such as the above-mentioned sensitivity, signal-to-noise ratio, and background noise, can be obtained by means of simulation or experimental testing.
  • the above-mentioned first data set and second data set constituted by the voltage applied to the thermistor. And store the above data set in the memory.
  • the controller when the controller obtains the ambient temperature, it can recall the voltage that matches the ambient temperature from the memory, and control the above-mentioned voltage source to at least provide the voltage to the thermistor, reducing the performance loss of the fluid detection device. Fluctuations caused by the influence of ambient temperature.
  • the controller is used to obtain the first signal representing the resistance of the thermistor, and obtain the first ambient temperature or the second ambient temperature matching the resistance range of the resistor from the first data set according to the first signal. temperature.
  • the controller is further configured to obtain from the second data set a first voltage that matches the ambient temperature range of the first ambient temperature, and control the voltage source to output the first voltage, or, from the second data set, obtain a voltage that matches The second voltage is matched with the ambient temperature range where the second ambient temperature is located, and the voltage source is controlled to output the second voltage.
  • the first data set includes a first subset and a second subset.
  • the first subset includes a plurality of resistance value ranges and a plurality of operating temperature ranges.
  • a range of resistance values matches an operating temperature range.
  • the second subset includes a plurality of operating temperature ranges and a plurality of ambient temperatures; an operating temperature range matches an ambient temperature.
  • the above-mentioned first subset and the second subset formed by operating temperatures corresponding to the respective ambient temperatures under different ambient temperatures are acquired. And store the above data set in the memory. Based on this, the controller is used to obtain the first ambient temperature or the second ambient temperature that matches the resistance of the thermistor according to the first signal from the first data set.
  • the first working temperature range or the second working temperature range matching the resistance value range of the resistance of the thermistor, and obtaining the first ambient temperature matching the first working temperature range from the second subset, or, from A second ambient temperature matching the second working temperature range is acquired in the second subset.
  • the embodiment of the present application provides a fluid detection device.
  • the fluid detection device comprises: a channel for fluid flow, at least one heating element, at least one thermistor and a voltage converter, wherein when the fluid flows in the channel, the fluid flows through the thermistor.
  • the heating element is electrically connected to the voltage converter.
  • the thermistor is electrically connected with the voltage converter, and the thermistor is used to generate a first signal corresponding to the temperature of the thermistor.
  • the voltage converter has a voltage terminal electrically connected to the heating element and the thermistor, and the voltage converter is used to output different voltages from the voltage terminal according to the first signal.
  • the fluid detection device has the same technical effect as the fluid detection device provided in the foregoing embodiments, which will not be repeated here.
  • the embodiment of the present application provides an electronic device.
  • the electronic equipment includes a casing and any fluid detection device as described above, and the fluid detection device is arranged in the casing.
  • the electronic device has the same technical effect as the fluid detection device provided in the foregoing embodiments, which will not be repeated here.
  • the embodiment of the present application provides a fluid detection device.
  • the fluid detection device includes a voltage source, a channel for fluid flow, at least one heating element, at least one thermistor. Wherein, the heating element is electrically connected to the voltage source.
  • the thermistor is electrically connected to the voltage source; wherein, when the fluid flows in the channel, the fluid flows through the thermistor, so that the thermistor can detect the flow (such as flow rate) of fluid such as gas.
  • the thermistor is used to sense the ambient temperature of the thermistor, and the ambient temperature is related to the temperature of the thermistor itself.
  • the voltage source When the ambient temperature of the thermistor is a third ambient temperature, the voltage source outputs a third voltage to the at least one heating element; when the ambient temperature of the thermistor is a fourth ambient temperature , the voltage source outputs a fourth voltage to the at least one heating element; wherein, the third ambient temperature is different from the fourth ambient temperature, and the third voltage is different from the fourth voltage.
  • the third ambient temperature is lower than the fourth ambient temperature; the third voltage is greater than the fourth voltage.
  • the embodiment of the present application provides a fluid detection device.
  • the fluid detection device includes a voltage source, a channel for fluid flow, at least one heating element, at least one thermistor. Wherein, the heating element is electrically connected to the voltage source.
  • the thermistor is electrically connected to the voltage source; wherein, when the fluid flows in the channel, the fluid flows through the thermistor, so that the thermistor can detect the flow (such as flow rate) of fluids such as gas.
  • the thermistor is used to sense the ambient temperature of the thermistor, and the ambient temperature is related to the temperature of the thermistor itself.
  • the at least one thermistor includes a first thermistor and a second thermistor; the first thermistor and the second thermistor serve as two branches of the bridge circuit respectively.
  • the fluid detection device also includes: a first resistor, the first resistor and the first thermistor are connected in series between the voltage source and the ground terminal; a second resistor, the second resistor and the second A thermistor is connected in series between the voltage source and the ground terminal; an operational amplifier, the first input terminal of the operational amplifier is electrically connected between the first resistor and the first thermistor, and the The second input end of the operational amplifier is electrically connected between the second resistor and the second thermistor.
  • the fluid detection device further includes: a comparator, the first input terminal of the comparator is electrically connected to one end of the first thermistor or the second thermistor away from the voltage source, and the comparator The second input end of the comparator is used to receive a reference voltage, and the output end of the comparator outputs a control signal; a switch, the switch is connected in series with the at least one heating element, and the gate end of the switch receives the control signal, so The switch is selectively turned on based on the control signal.
  • the embodiment of the present application provides a fluid detection device.
  • the fluid detection device includes a voltage source, a channel for fluid flow, at least one heating element, at least one thermistor. Wherein, the heating element is electrically connected to the voltage source.
  • the thermistor is electrically connected to the voltage source; wherein, when the fluid flows in the channel, the fluid flows through the thermistor, so that the thermistor can detect the flow (such as flow rate) of fluid such as gas.
  • the voltage source When the fluid detection device works in the first mode, the voltage source outputs fifth voltage to at least one thermistor; when the fluid detection device works in the second mode, the voltage source outputs sixth voltage to at least one thermistor.
  • the first mode is a power saving mode
  • the second mode is a high performance mode
  • the sixth voltage is greater than the fifth voltage.
  • the fluid detection device works in different modes.
  • FIG. 1A and FIG. 1B are schematic structural diagrams of a fluid detection device provided by an embodiment of the present application.
  • Fig. 2 is a schematic structural diagram of another fluid detection device provided in the embodiment of the present application.
  • FIG. 3 is a schematic diagram of a circuit structure of a microphone module provided by an embodiment of the present application.
  • FIG. 4A is a schematic structural diagram of a microphone module provided by an embodiment of the present application.
  • FIG. 4B is a schematic diagram of a circuit structure corresponding to the structure of the microphone module shown in FIG. 4A;
  • Fig. 5A is in the microphone module shown in Fig. 4A, the distance between the first thermistor wire (or, the second thermistor wire) and the third thermistor wire and the temperature of the above three thermistor wires A graph of change;
  • Fig. 5B is the distance between the first thermistor wire (or the second thermistor wire) and the third thermistor wire and the temperature of the above three thermistor wires in the microphone module shown in Fig. 4A Another graph of change;
  • FIG. 6 is a schematic diagram of another circuit structure corresponding to the structure of the microphone module shown in FIG. 4A;
  • FIG. 7 is a schematic diagram of the circuit structure of another microphone module provided by the embodiment of the present application.
  • FIG. 8 is a schematic diagram of another circuit structure corresponding to the structure of the microphone module shown in FIG. 4A;
  • FIG. 10 is a flowchart of a method for controlling a microphone module provided in an embodiment of the present application.
  • FIG. 11A is a schematic diagram of a mode selection of the electronic device shown in FIG. 9;
  • FIG. 11B is a schematic diagram of the curve relationship between the vibration frequency of the particle and the sensitivity of the microphone module during the sound wave transmission process provided by the embodiment of the present application;
  • FIG. 12 is a schematic structural diagram of another microphone module provided by the embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of another microphone module provided by the embodiment of the present application.
  • FIG. 14 is a schematic diagram of specific steps of S102 in FIG. 10;
  • FIG. 15 is a schematic diagram of the circuit structure of another microphone module provided by the embodiment of the present application.
  • FIG. 16 is a schematic diagram of the circuit structure of another microphone module provided by the embodiment of the present application.
  • FIG. 17 is a schematic diagram of the circuit structure of another microphone module provided by the embodiment of the present application.
  • FIG. 18 is a schematic diagram of the circuit structure of another microphone module provided by the embodiment of the present application.
  • 01-fluid detection device 11-heating element; 12-thermistor; 10-substrate; 100-groove; 30-voltage source; 40-controller; 101-electrode; 200-bridge circuit; 20a-first heat Sensitive resistance wire; 20b-the second thermistor wire; Ra-the first resistance; Rb-the second resistance; 20c-the third thermistor wire; 30a-the first sub-voltage source; 30b-the second sub-voltage source; 30c-third sub-voltage source; 03-electronic equipment; 300-housing; 301-display screen; 302-button; 50-memory; 401-control component; 402-processor circuit; 401a-first control circuit; -voltage control circuit in the first control assembly; 420a-current acquisition circuit in the first control assembly; 401b-second control circuit; 410b-voltage control circuit in the second control assembly; 420b-in the second control assembly Current acquisition circuit; 401c-voltage control circuit in the third
  • first”, second, etc. are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features.
  • a feature defined as “first”, “second”, etc. may expressly or implicitly include one or more of that feature.
  • connection should be understood in a broad sense, for example, “connection” can be a fixed connection, a detachable connection, or an integral body; it can be a direct connection, or It can be connected indirectly through an intermediary.
  • electrical connection can be understood as “coupling”, and “electrical connection” can be an electrical connection by direct contact or an electrical connection through an intermediary.
  • the fluid is an air flow as an example for illustration.
  • the fluid detection device may include a substrate 10 and at least one heating element 11 and at least one thermistor 12 disposed on the substrate 10 (a heating element 11 and a thermistor 12 are illustrated in FIG. 1A as an example).
  • the substrate 10 may be a silicon substrate, and a groove 100 may be formed on the substrate 10, and the groove 100 may be formed by etching or other processes.
  • the heating element 11 and the thermistor 12 are straddled on both sides of the groove 100 , and the heating element 11 and the thermistor 12 are arranged side by side, for example, the heating element 11 and the thermistor 12 are arranged in parallel.
  • the groove 100 can serve as a channel for the airflow L1. Fluid such as the airflow L1 flows in the channel, and the thermistor 12 is located in the channel to detect the flow of the fluid. When fluids such as airflow L1 pass through the groove 100, they can flow from the heating element 11 to the thermistor 12, or the airflow can flow from the thermistor 12 to the heating element 11 through the groove 100, and the groove 100 can act as a propagating sound wave (or airflow) channel.
  • the groove 100 may serve as a part of the passage of the air flow L1.
  • the fluid detection device 01 further includes a packaging cover 10a.
  • the outline of the packaging cover 10a is indicated by a dotted line.
  • the package cover 10a includes a groove 100a corresponding to the groove 100. When the substrate 10 and the package cover 10a are packaged together, the package cover 10a is buckled on the substrate 10, the groove 100a faces the groove 100, and the groove 100a A channel is formed with the groove 100, and fluids such as airflow L1 can flow in the channel.
  • the fluid detection device includes a hollow pipe, and the hollow part inside the pipe serves as a channel for propagating sound waves (or airflow).
  • a voltage can be applied to the heating element 11 , which generates heat to provide a temperature field to the thermistor 12 .
  • the distance between the heating element 11 and the thermistor 12 may be less than or equal to 300 ⁇ m.
  • the thermistor 12 can receive the temperature field generated by the heating element 11 .
  • the thermistor 12 can be used to generate a first signal corresponding to the temperature of the thermistor 12 under the action of the above-mentioned temperature field, and the temperature of the thermistor 12 reflects the ambient temperature where the thermistor 12 is located.
  • the purpose of measuring the flow rate and flow rate of the gas is achieved.
  • the purpose of measuring the flow velocity and flow rate of the gas can be achieved by detecting the first signal of the thermistor 12, so that the fluid detection device 01 can be used as a microphone (or microphone) for detecting sound waves.
  • the above-mentioned thermistor 12 may be a thermistor wire.
  • the heating element 11 When the heating element 11 is energized, the generated temperature field acts on the thermistor wire (ie, the thermistor 12 ).
  • the resistance of the thermistor wire changes under the action of the airflow, so that the above-mentioned first signal for characterizing the resistance of the thermistor wire can be generated.
  • the resistance of the thermistor wire is different.
  • the temperature change of the thermistor wire is related to the flow velocity of the gas flow, so the purpose of measuring the flow velocity and flow rate of the gas can be achieved by detecting the resistance value of the thermistor wire.
  • the above-mentioned thermistor 12 and the heating element 11 may both be thermistor wires, and the heating element 11 may also serve as a thermistor.
  • the thermistor is a first thermistor wire 20 a as shown in FIG. 2
  • the heating element 11 is a second thermistor wire 20 b as shown in FIG. 2 .
  • the temperature generated can be 100K-600K, so the first thermistor wire 20a and the second thermistor wire 20b can both be generate a temperature field.
  • the first thermistor wire 20a when the air flow sequentially flows through the first thermistor wire 20a and the second thermistor wire 20b, or when the air flow sequentially flows through the second thermistor wire 20b and the first thermistor wire 20a, the first thermistor wire 20a
  • the resistance values of the first thermistor wire 20a and the second thermistor wire 20b change under the action of the airflow.
  • the thermistor may generate a first signal indicative of the resistance of the first thermistor wire 20a and/or the second thermistor wire 20b.
  • the above-mentioned airflow flowing through the first thermistor wire 20a and the second thermistor wire 20b will cause the temperature field distribution of the fluid detection device 01 to change, thereby generating a temperature gradient, so that the gap between the two thermistor wires produce a temperature difference.
  • the resistance of the thermistor wire is different.
  • the above-mentioned temperature difference is related to the flow velocity of the gas flow, so the purpose of measuring the flow velocity and flow rate of the gas can be achieved by detecting the resistance values of the two thermistor wires.
  • the first thermistor wire 20a and the second thermistor wire 20b can both be used as heating wires providing a temperature field, or both can be used as sensitive wires whose resistance changes according to temperature conversion.
  • the groove 100 can be used as a channel for the airflow L1, or the groove 100 can be used as a part of the channel, and fluids such as the airflow L1 flow in the channel.
  • the fluid detection device 01 in FIG. 2 may also include the packaging cover 10a in FIG. 1B .
  • the materials and dimensions of the first thermistor wire 20a and the second thermistor wire 20b may be the same. So any thermistor wire in the first thermistor wire 20a and the second thermistor wire 20b can be used as the above-mentioned thermistor 12, and another resistance wire is used as the heating element 11; or, the first thermistor wire 20a and The second thermistor wires 20b serve as heating elements of each other, and the first thermistor wires 20a and the second thermistor wires 20b are used together as a thermistor. At this time, the resistance value of any one or both of the first thermistor wire 20a and the second thermistor wire 20b under the action of the airflow can be represented by the above-mentioned first signal.
  • the above-mentioned thermistor wire may have a positive temperature coefficient effect (positive temperature coefficient, PTC). In this case, the resistance of the above-mentioned thermistor wire increases as the temperature increases.
  • the above-mentioned thermistor wire may have a negative temperature coefficient effect (negative temperature coefficient, NTC). In this case, the resistance of the above-mentioned thermistor wire decreases as the temperature increases.
  • NTC negative temperature coefficient
  • the following embodiments are all described by taking the thermistor wire having a positive temperature coefficient effect and the thermistor wire being a resistance wire as an example.
  • the thermistor 12 is the first thermistor wire 20a as shown in Figure 2
  • the heating element 11 is the second thermistor wire 20b as shown in Figure 2
  • to the first thermistor Voltage is applied to the resistance wire 20a and the second thermistor wire 20b
  • the resistance values of the first thermistor wire 20a and the second thermistor wire 20b can change under the action of airflow. Therefore, in order to apply a voltage to the first thermistor wire 20a and the second thermistor wire 20b, and to control the magnitude of the applied voltage, as shown in FIG.
  • the device 40 and the electrode 101 provided on the above-mentioned substrate 10 the electrode 101 is electrically connected with the first thermistor wire 20a and the second thermistor wire 20b.
  • controller 40 may be a part of a processor such as an application processor (application processor, AP) in the electronic device having the fluid detection device 01, or may be a digital signal processor (digital signal processor) independent of the application processor. digital signal processing, DSP).
  • a processor such as an application processor (application processor, AP) in the electronic device having the fluid detection device 01, or may be a digital signal processor (digital signal processor) independent of the application processor. digital signal processing, DSP).
  • the first thermistor wire 20 a and the second thermistor wire 20 b can be electrically connected to the voltage source 30 through the electrode 101 .
  • the voltage source 30 can apply a voltage to the first thermistor wire 20a and the second thermistor wire 20b through the electrode 101, and the voltage source 30 can apply a voltage value to the first thermistor wire 20a and the second thermistor wire 20b. same or different.
  • the controller 40 may be electrically connected with the voltage source 30 .
  • the voltage source 30 can at least apply the first voltage U1 to the first thermistor wire 20a as the thermistor 12 to compensate the first thermistor. Due to fluctuations in performance parameters such as sensitivity and noise caused by temperature changes of the resistance wire 20a, the fluid detection device 01 has higher sensitivity and a good signal-to-noise ratio.
  • the use environment of the fluid detection device 01 changes, for example, when the temperature changes from the first ambient temperature T1 to the second ambient temperature T2, at least the first thermistor wire 20a as the thermistor 12 can be supplied by the above-mentioned voltage source 30
  • the second voltage U2 is applied to compensate the fluctuation of performance parameters such as sensitivity and noise of the first thermistor wire 20a due to temperature changes, so that the fluid detection device 01 can still maintain a high sensitivity and a good signal-to-noise ratio.
  • gas such as air
  • particles or called particles, particles in English
  • the purpose of collecting sound signals can be achieved by obtaining the vector information of particle vibration velocity (or particle vibration velocity) of the gas (such as air) medium.
  • the above-mentioned fluid detection device 01 can also be applied in a sound system as a microphone (microphone, MIC) module to detect sound.
  • the microphone module can also include a substrate 10 as shown in FIG. 1A , at least one heating element 11 and at least one thermistor 12 or a substrate 10 as shown in FIG. 2 , a first thermistor wire 20a , the second thermistor wire 20b, the voltage source 30, the controller 40 and the electrode 101.
  • the connection method and functions of the above components are the same as above, and will not be repeated here.
  • the thermistor 12 is the first thermistor wire 20a as shown in Figure 2, and the heating element 11 is the second thermistor wire 20b as shown in Figure 2, to the first thermistor wire 20a and The second thermistor wire 20b applies a voltage.
  • the sound wave passes through the first thermistor wire 20a and the second thermistor wire 20b (two-wire model, that is, the fluid detection device 01 includes two thermistor wires)
  • the first thermistor wire The resistance values of the first thermistor wire 20a and the second thermistor wire 20b can be changed under the action of sound waves.
  • a voltage is applied to the first thermistor wire 20a and the second thermistor wire 20b as shown in FIG. field.
  • the reciprocating motion of the particle forms a convective heat transfer of the particle, thereby transferring the heat from across the groove 100
  • the first thermistor wire 20a on both sides is transferred to the second thermistor wire 20b (or, the second thermistor wire 20b is transferred to the first thermistor wire 20a).
  • the temperature of the first thermistor wire 20a when the sound is transmitted from the side of the first thermistor wire 20a, the temperature of the first thermistor wire 20a will decrease. In some embodiments, when the sound is transmitted from the first thermistor wire 20a to the second thermistor wire 20b, the temperature of the second thermistor wire 20b will increase. In some embodiments, when the sound is transmitted from the side of the second thermistor wire 20b, the temperature of the second thermistor wire 20b will decrease. In some embodiments, when the sound is transmitted from the second thermistor wire 20b to the first thermistor wire 20a, the temperature of the first thermistor wire 20a will increase.
  • the temperature field distribution of the fluid detection device 01 will change, and a temperature gradient will be generated, so that a temperature difference will be generated between the two first thermistor wires 20a and the second thermistor wire 20b.
  • the resistance values of the first thermistor wire 20a and the second thermistor wire 20b are different.
  • the size of the above temperature difference is related to the vibration velocity of the particle.
  • the resistance change of the first thermistor wire 20a and/or the second thermistor wire 20b can be converted into a voltage change, that is, a voltage difference ⁇ u 0 .
  • the resistance value of the first thermistor wire 20a and/or the second thermistor wire 20b changes with temperature
  • the second end b2 of the first thermistor wire 20a and the second thermistor wire 20b will The voltage difference ⁇ u 0 between the second terminals c2 changes.
  • the resistance value change of the first thermistor wire 20a and/or the second thermistor wire 20b can be converted into a voltage difference ⁇ u 0 . Therefore, sound information can be obtained by obtaining the above-mentioned voltage difference ⁇ u 0 .
  • f is the particle vibration frequency
  • ⁇ T(f) is the function of the temperature change ⁇ T on the thermistor wire with respect to the frequency f
  • ⁇ T(0) is the frequency f is 0, that is, the temperature at DC Change
  • ⁇ T(0) can be obtained by formula (4).
  • f hc is the frequency change caused by parameters such as the size and heat capacity of the thermistor wire; f D is the frequency change caused by parameters such as air thermal diffusivity; D is the thermal diffusivity of the medium; Lh is the thermistor wire (such as resistance ⁇ 1 is the density of air; ⁇ 2 is the density of the thermistor wire; P is the power of the thermistor wire; k is the thermal conductivity of the medium (for example, air); The distance between two thermistor wires; ly is the length of the thermistor wire (such as resistance wire); ⁇ is Euler's constant (0.577); v is the vibration velocity of particles in the medium; U is applied to the thermistor wire The voltage; ⁇ 3 is the resistivity of the thermistor wire 20.
  • the microphone module 02 is a three-wire model (that is, the microphone module 02 includes three thermistor wires).
  • the third thermistor wire 20c is located between the first thermistor wire 20a and the second thermistor wire 20b to heat the first thermistor wire 20a and the second thermistor wire 20b.
  • the first thermistor wire 20a and the second thermistor wire 20b may be arranged symmetrically with respect to the third thermistor wire 20c.
  • the first end g1 of the third thermistor wire 20 c can be electrically connected to the voltage source 30
  • the second end g2 of the third thermistor wire 20 c can be grounded.
  • the difference between the third thermistor wire 20c and the first thermistor wire 20a and the second thermistor wire 20b is that the third thermistor wire 20c is not connected to the bridge circuit 200 .
  • the voltage source 30 can apply a voltage to the third thermistor wire 20c
  • the heat generated by the third thermistor wire 20c can be applied to the first thermistor wire 20a and the second thermistor wire 20b.
  • the temperature change ⁇ T can achieve the purpose of improving the sensitivity of the microphone module.
  • the distance between the first thermistor wire 20 a or the second thermistor wire 20 b and the third thermistor wire 20 c may be less than or equal to 300 ⁇ m. In this way, the first thermistor wire 20a and the second thermistor wire 20b can receive the temperature field generated by the third thermistor wire 20c.
  • the first thermistor wire 20a and the second thermistor wire 20b are used as sensitive wires to convert the resistance value into a voltage difference ⁇ u 0 .
  • the third thermistor wire 20c can be used as a heating wire, providing a temperature field to the first thermistor wire 20a and the second thermistor wire 20b through self-heating. It should be noted that the materials and dimensions of the first thermistor wire 20a and the second thermistor wire 20b may be the same. In addition, the third thermistor wire 20c may be made of the same material and dimension as the first thermistor wire 20a.
  • a higher voltage can be provided to the third thermistor wire 20c to increase the third thermal resistance.
  • the third thermistor wire 20c may be different from the first thermistor wire 20a in material and dimension.
  • the material and size specifications of the third thermistor wire 20c can be adjusted so that the first thermistor wire When the resistance wire 20a, the second thermistor wire 20b and the third thermistor wire 20c receive the same voltage, the heat generated by the third thermistor wire 20c is higher.
  • the microphone module 02 includes the first thermistor wire 20a, the second thermistor wire 20b, and the third thermistor wire 20c
  • the first thermistor wire 20a (or, the second thermistor wire
  • the distance between 20b) and the third thermistor wire 20c (unit ⁇ m), and the temperature (unit K) variation curves of the above three thermistor wires are shown in FIG. 5A and FIG. 5B .
  • the abscissa where point A3 is located is 0 ⁇ m
  • this point A3 represents that the temperature of the third thermistor wire 20c located in the middle is 960K, and the temperature of the third thermistor wire 20c is the highest, and point A3 temperature is at the highest point.
  • the temperature decreases.
  • the positive coordinate indicates the distance from the third thermistor wire 20c in the first direction X
  • the negative coordinate indicates the distance from the third thermistor wire 20c in the direction opposite to the first direction X.
  • the first thermistor wire 20a (or, the second thermistor wire 20b) and the third thermistor wire 20c increases, the first thermistor wire 20a (or, the second thermistor wire 20b) The temperature of the wire 20b) decreases.
  • the medium particle will reciprocate during the propagation of the sound, for example, the medium particle will not only move from the first thermistor wire 20a toward the direction of the second thermistor wire 20b (for example, from the left end to the right end of FIG. 4A ), It will also move from the second thermistor wire 20b toward the direction of the first thermistor wire 20a (for example, from the right end to the left end). Therefore, when the second thermistor wire 20b of the medium particle moves toward the direction of the first thermistor wire 20a, it can be obtained in the same way that the temperature of the second thermistor wire 20b will drop, and the first thermistor wire will The heat of wire 20a is increased.
  • the above is based on the microphone module 02 as a three-wire model (that is, including the first thermistor wire 20a, the second thermistor wire 20b and the third thermistor wire 20c) as an example, combined with the thermistor wire
  • the above-mentioned first thermistor wire 20a and the second thermistor wire 20b can be used as sensitive wires , to be converted into a voltage difference ⁇ u 0 through the change of the resistance value, and can also be used as a heating wire to provide a temperature field through self-heating.
  • the change law of the temperature of the thermistor wire and the distance between the thermistor wires is the same as that described above, and will not be repeated here repeat.
  • the difference is that the distance of the abscissa of the above curve is the distance between the first thermistor wire 20a and the second thermistor wire 20b.
  • the microphone module 02 when the microphone module 02 is a three-wire model, the microphone module 02 includes a heating wire (for example, the third thermistor wire 20c) located in the middle, and two heating wires respectively located on both sides of the heating wire.
  • Sensitive wires for example, the first thermistor wire 20a and the second thermistor wire 20b.
  • two or more sensitive wires connected in parallel may be arranged on one side of the heating wire, and the number of sensitive wires on both sides of the heating wire may be the same.
  • the present application does not limit the number of sensitive wires, as long as all the sensitive wires can be connected to the bridge circuit 200 shown in FIG. 4B .
  • the resistance value of the thermistor wire as the sensitive wire can be changed under the action of the air flow, such as the sound wave signal.
  • the above-mentioned microphone module 02 may be called a hot-wire vector microphone module or a vector sensor (acoustic vector sensor, AVS) module.
  • the AVS module Compared with the rocker-type vector microphone module with poor frequency response consistency and the ciliated vector microphone module with difficult process processing, the AVS module has the advantages of high signal-to-noise ratio and high processing efficiency, which can be applied to industrial measurement. Simple and other advantages.
  • Wire 20c is connected to the same voltage source 30 .
  • the microphone module 02 further includes a controller 40 connected to the voltage source 30, as shown in FIG.
  • the above-mentioned first signal of at least one thermistor wire in the third thermistor wire 20c (for characterizing the resistance value of the thermistor wire), and control the voltage source 30 according to the first signal under the first ambient temperature T1,
  • the first voltage U1 is output, and at the second ambient temperature T1, the first voltage U1 is output and the second voltage U2 is output.
  • the above-mentioned voltage source 30 can supply the first thermistor wire 20a, the second thermistor wire 20b and the third thermistor wire 20c. Any one, two or three apply the first voltage U1, so that the microphone module 02 has higher sensitivity and good signal-to-noise ratio.
  • the first thermistor wire 20a and the second thermistor wire can be supplied by the above-mentioned voltage source 30 Any one, two or three of the thermistor wire 20b and the third thermistor wire 20c apply the second voltage U2, so that the microphone module 02 can still maintain a high sensitivity and a good signal-to-noise ratio.
  • the above is based on the microphone module 02 as a three-wire model, that is, including three thermistor wires of the first thermistor wire 20a, the second thermistor wire 20b and the third thermistor wire 20c.
  • the control method of the controller 40 is described with an example.
  • the microphone module 02 is a two-wire model as shown in FIG.
  • the first thermistor wire 20a and the second thermistor wire 20b may receive the same voltage output from the voltage source 30 at the same ambient temperature, and the specific control process will not be repeated here.
  • the first end b1 of the first thermistor wire 20a is electrically connected to the first sub-voltage source 30a
  • the first end c1 of the second thermistor wire 20b is electrically connected to the second sub-voltage source 30b.
  • both the first sub-voltage source 30 a and the second sub-voltage source 30 b are electrically connected to the controller 40 .
  • the controller 40 can obtain the external ambient temperature according to the change of the resistance value of the thermistor, and apply to the first thermistor wire 20a and/or the second thermistor wire respectively through different voltage sources.
  • the voltage of 20b is controlled so that the performance of the microphone module 02 will not fluctuate greatly as the ambient temperature changes.
  • the output voltages of the first sub-voltage source 30a and the second sub-voltage source 30b can be the same, so that, compared with the scheme of using two thermistor wires to share one voltage source, it can be The loads of the first sub-voltage source 30a and the second sub-voltage source 30b are reduced to achieve the purpose of reducing power consumption.
  • the microphone module 02 when the microphone module 02 is a three-wire model (that is, includes the first thermistor wire 20a, the second thermistor wire 20b and the third thermistor wire 20c) , as shown in FIG. 8 , the microphone module 02 may include three voltage sources, which are respectively a first sub-voltage source 30a, a second sub-voltage source 30b and a third sub-voltage source 30c.
  • the first end b1 of the first thermistor wire 20a is electrically connected to the first sub-voltage source 30a
  • the first end c1 of the second thermistor wire 20b is electrically connected to the second sub-voltage source 30b
  • the third thermistor wire The first terminal g1 of 20c is connected to the third sub-voltage source 30c.
  • a voltage source can also have multiple output terminals, and different output terminals can be electrically connected to different components, such as thermistor wires, thermistors or heating elements, and different output terminals can output the same voltage or different voltages to power different components.
  • the first output terminal of the voltage source supplies power to the first thermistor wire 20a
  • the second output terminal of the voltage source supplies power to the second thermistor wire 20b.
  • the same output terminal of a voltage source can be connected to different components to provide the same voltage for different components.
  • a voltage source can supply the same voltage to two thermistors at the same time.
  • the voltage source may be a voltage converter or the like.
  • the first sub-voltage source 30 a , the second sub-voltage source 30 b and the third sub-voltage source 30 c are all electrically connected to the controller 40 .
  • the controller 40 can respectively control the voltages applied to the first thermistor wire 20a, the second thermistor wire 20b and the third thermistor wire 20c through different voltage sources according to the external ambient temperature. Control to enable microphone module 02 performance.
  • the above-mentioned fluid detection device 01 can be applied to any electronic device with voice recognition or voice communication functions.
  • the electronic device may be a TV with relatively high power, a desktop computer, an all-in-one machine, an intelligent audio device, a vehicle-mounted voice recognition device, and the like.
  • the electronic device may also be a tablet computer, a mobile phone, a smart watch, etc. with less power.
  • the television 03 may include a housing 300 , a display screen 301 inside the housing 300 , and a microphone module 02 disposed below the display screen.
  • the electronic device 03 has the same technical effect as the microphone module 02 provided in the foregoing embodiments, so the electronic device with the above-mentioned microphone module 02, when the temperature of the environment used by the user is different, the performance of the microphone module 02 will not vary with Large fluctuations due to changes in ambient temperature.
  • the microphone module 02 can be located at any position of the TV set, for example, it can be located at the lower frame (as shown in FIG. 9 ), the upper frame, the left frame, the right frame or behind the display screen 301 of the TV set.
  • the control method of the controller 40 includes S100-S102 as shown in FIG. 10 .
  • the working modes of the above-mentioned microphone module 02 may include a first mode (eg power saving mode) and a second mode (eg high performance mode).
  • the power-saving mode the power consumption of the microphone module 02 is small, but the electrical signal output by the microphone module 02 is small (for example, the voltage difference ⁇ u 0 in FIG. 8 is small, and/or, the voltage source supplies the heating element and/or the power supply voltage provided by the thermistor is small), at this time the performance (eg, sensitivity) of the microphone module 02 is poor.
  • the high-performance mode the power consumption of the microphone module 02 is relatively large, but the electrical signal output by the microphone module 02 is relatively large (for example, the voltage difference ⁇ u 0 in FIG. The power supply voltage provided by the heating element and/or the thermistor is relatively large), at this time, the performance of the microphone module 02 is relatively good.
  • the above-mentioned microphone module 02 when the above-mentioned microphone module 02 is applied to a TV, when the TV is playing images and sounds, and there is no need for calls and voice recognition, the user has lower requirements for the sensitivity of the microphone module 02 . At this time, the above-mentioned microphone module 02 can work in the power saving mode. Alternatively, when the TV is performing voice recognition or voice calls, the user has higher requirements on the sensitivity of the microphone module 02 . At this time, the above-mentioned microphone module 02 can work in a high-performance mode.
  • the user can select the working mode of the microphone module 02 according to needs, or the electronic device can automatically determine to enter the power saving mode or High performance mode.
  • the user can use the remote control of the TV, as shown in FIG. Power saving mode and high performance mode to choose. For example, if the selection button 302 is on the left side, it means that the working mode of the microphone module 02 is turned on, and if the selection button 302 is on the right side, it means that the working mode of the microphone module 02 is off.
  • the power saving mode or high performance mode can also be selected for the TV through the mobile phone.
  • the electronic device may automatically determine to enter the power saving mode or the high performance mode according to one or more of currently running software, programs or functions. For example, when the user turns on the voice call function of the electronic device, or the electronic device is using its own microphone for voice passing, the microphone module 02 automatically enters the high-performance mode; When the voice is awakened, the microphone module 02 is in power-saving mode. When the electronic device is awakened by voice (for example, the user calls the wake-up word "Xiaoyi Xiaoyi" to wake up the intelligent voice system), the electronic device needs to recognize the user's semantics, and the microphone module Group 02 automatically enters high performance mode.
  • voice for example, the user calls the wake-up word "Xiaoyi Xiaoyi" to wake up the intelligent voice system
  • the electronic device needs to recognize the user's semantics, and the microphone module Group 02 automatically enters high performance mode.
  • the selection key 302 corresponding to the high-performance mode shown in FIG. 11A is located on the left side, so that the high-performance mode is turned on.
  • the execution of the above S100 by the controller 40 specifically includes: the controller 40 receives the user's above-mentioned second mode selection operation, and in response to the second mode selection operation, controls the voltage source, such as the first sub-mode shown in FIG. 8
  • the voltage source 30a, the second sub-voltage source 30b and the third sub-voltage source 30c output the second mode initial voltage U2.
  • FIG. 11B is a curve relationship between the vibration frequency of the particle and the sensitivity of the microphone module 02 during the sound wave transmission process.
  • the obtained curves for example, curve 1, curve 2 and curve 3 are different.
  • the voltage U applied to the first thermistor wire 20a and the second thermistor wire 20b by the curve 1, the curve 2 and the curve 3 increases sequentially.
  • the vibration frequency of the particle is constant, such as 2000 Hz
  • the greater the voltage U applied to the first thermistor wire 20a and the second thermistor wire 20b The higher the sensitivity of the microphone module 02, the better the performance of the microphone module 02.
  • the smaller the voltage U applied to the first thermistor wire 20 a and the second thermistor wire 20 b the lower the sensitivity of the microphone module 02 and the worse the performance of the microphone module 02 .
  • the relationship between the voltage U applied to the first thermistor wire 20a and the second thermistor wire 20b and the performance of the microphone module 02 can also be as follows Table 1 shows.
  • the initial voltage U2 of the second mode provided to the above-mentioned thermistor wire in the high-performance mode can be greater than that in the power-saving mode
  • the initial voltage U1 of the first mode is supplied to the above-mentioned thermistor wire.
  • the initial voltage U1 in the first mode may be 2V ⁇ 4V.
  • the initial voltage U1 of the first mode is less than 2V, the voltage applied to the thermistor wire is too small, so that the sensitivity of the microphone module 02 is too low, which affects the performance of the microphone module 02 .
  • the initial voltage U1 in the first mode is greater than 4V, the voltage applied to the thermistor wire is too large, which increases the power consumption of the microphone module 02 and reduces the power saving effect.
  • the initial voltage U1 in the first mode may be 2V, 2.5V, 3V, 3.5V or 4V.
  • the initial voltage U2 of the second mode may be 5V ⁇ 12V.
  • the initial voltage U2 of the second mode is less than 5V, the voltage applied to the thermistor wire is too small, so that the sensitivity of the microphone module 02 is too low, which is not conducive to the high performance standard of the microphone module 02 .
  • the initial voltage U2 of the second mode is greater than 12V, the voltage applied to the thermistor wire is too large, which increases the power consumption of the microphone module 02, and the thermistor wire heats up severely, increasing the possibility of the thermistor wire failing. risk.
  • the aforementioned second mode initial voltage U2 may be 5V, 6V, 7V, 8V, 9V, 10V, 11V or 12V.
  • the user controls the position of the selection button 302 in the setting interface of the TV display screen 301 shown in FIG.
  • the mode selection operation is described by taking the selection of the power saving mode or the high performance mode as an example.
  • the user may also directly press the mode button provided on the remote control of the television to perform the above-mentioned first mode selection operation or second mode selection operation.
  • the TV set when the TV set can be electrically connected to the user's mobile terminal, such as a mobile phone or a tablet computer, in a wireless manner, the user can also control and select a button in the mobile phone operation interface to perform the above-mentioned A first mode selection operation or a second mode selection operation.
  • the user's mobile terminal such as a mobile phone or a tablet computer
  • the user can also control and select a button in the mobile phone operation interface to perform the above-mentioned A first mode selection operation or a second mode selection operation.
  • This application is not limited to this.
  • the microphone module 02 may further include a memory 50 as shown in FIG. 12 ,
  • the memory 50 is electrically connected to the controller 40 .
  • the first mode initial voltage U1 and the second mode initial voltage U2 are stored in the memory 50 .
  • the controller 40 when the controller 40 receives the first mode selection operation issued by the user, it can respond to the first mode selection operation, obtain the first mode initial voltage U1 from the memory 50, and control the first sub-voltage source 30a , the second sub-voltage source 30b and the third sub-voltage source 30c output the first-mode initial voltage U1 to the thermistor wires electrically connected to them.
  • the controller 40 when the controller 40 receives the second mode selection operation issued by the user, it can respond to the second mode selection operation, obtain the second mode initial voltage U2 from the memory 50, and control the first sub-voltage source 30a, the second sub-voltage source 30a, The second sub-voltage source 30b and the third sub-voltage source 30c output the aforementioned second-mode initial voltage U2 to the thermistor wires electrically connected to them.
  • the controller 40 may include at least one control component (such as a first control component 401a, a second control component 401b, and a third control component 401c), and a processor circuit 402.
  • at least one control component such as a first control component 401a, a second control component 401b, and a third control component 401c
  • any one or more of the first control component 401a, the second control component 401b and the third control component 401c may include a voltage control circuit.
  • the voltage control circuit 410 a in the first control component 401 a is electrically connected to the first sub-voltage source 30 a and the processor circuit 402 .
  • the voltage control circuit 410b in the second control component 401b is electrically connected to the second sub-voltage source 30b and the processor circuit 402 .
  • the voltage control circuit 410c in the third control component 401c is electrically connected to the third sub-voltage source 30c and the processor circuit 402 . Any one of the above voltage control circuits is used to control the output voltage of the voltage source electrically connected to the voltage control circuit according to the voltage control instruction output by the processor circuit 402.
  • the processor circuit 402 in the controller 40 can obtain the first mode initial voltage from the memory 50 in response to the first mode selection operation. U1, and output voltage control instructions to the voltage control circuits in the first control component 401a, the second control component 401b and the third control component 401c.
  • the voltage control circuit 410a in the first control component 401a controls the first sub-voltage source 30a electrically connected to it to output the first-mode initial voltage U1 according to the voltage control instruction.
  • the voltage control circuit 410b in the second control component 401b controls the second sub-voltage source 30b electrically connected to it to output the first mode initial voltage U1 according to the voltage control instruction.
  • the voltage control circuit 410c in the third control component 401c controls the third sub-voltage source 30c electrically connected to it to output the first mode initial voltage U1 according to the voltage control instruction.
  • the processor circuit 402 in the controller 40 may acquire the second mode initial voltage U2 from the memory 50 in response to the second mode selection operation, And output voltage control instructions to the voltage control circuits in the first control component 401a, the second control component 401b and the third control component 401c.
  • the voltage control circuit 410a in the first control component 401a controls the first sub-voltage source 30a electrically connected to it to output the above-mentioned second-mode initial voltage U2 according to the voltage control instruction.
  • the voltage control circuit 410b in the second control component 401b controls the second sub-voltage source 30b electrically connected to it to output the above-mentioned second-mode initial voltage U2 according to the voltage control instruction.
  • the voltage control circuit 410c in the third control component 401c controls the third sub-voltage source 30c electrically connected to it to output the above-mentioned second-mode initial voltage U2 according to the voltage control instruction.
  • the control process of the microphone module 02 also includes the following S101 and S102.
  • the thermistor can generate a first signal corresponding to the temperature, and the first signal is used to represent the resistance value of the thermistor.
  • the microphone module 02 including two thermistors as the first thermistor wire 20a and the second thermistor wire 20b as an example, the resistance of the first thermistor wire 20a or the second thermistor wire 20b Values can vary depending on temperature.
  • the first signal can also be the voltage difference ⁇ u 0 in the bridge circuit
  • the voltage difference ⁇ u 0 can represent the resistance value of the thermistor
  • the change of the voltage difference ⁇ u 0 reflects the resistance value of the thermistor The change.
  • the first signal may also be the voltage value of the second end b2 of the first thermistor wire 20a, and/or, the voltage value of the second end c2 of the second thermistor wire 20b, the first
  • the change of the voltage value of the second end b2 of the thermistor wire 20a can reflect the change of the resistance value of the first thermistor wire 20a
  • the change of the voltage value of the second end c2 of the second thermistor wire 20b can reflect the change of the resistance value of the second thermistor wire 20b.
  • the variation of the resistance value of the two thermistor wires 20b is the variation of the resistance value of the two thermistor wires 20b.
  • any one of the first control component 401 a , the second control component 401 b and the third control component 401 c in the controller 40 further includes a current acquisition circuit.
  • the current collection circuit 420a in the first control component 401a is electrically connected to the first sub-voltage source 30a, and the current collection circuit 420a is used to collect the current output from the first sub-voltage source 30a to the first thermistor wire 20a.
  • the current collection circuit 420b in the second control component 401b is electrically connected to the second sub-voltage source 30b, and the current collection circuit 420b is used to collect the current output from the second sub-voltage source 30b to the second thermistor wire 20b.
  • the current collection circuit 420c in the third control component 401c is electrically connected to the third sub-voltage source 30c, and the current collection circuit 420c is used to collect the current output from the third sub-voltage source 30c to the second thermistor wire 20c.
  • the processor circuit 402 electrically connected to each of the above-mentioned current acquisition circuits can calculate the first The resistance Ra of the thermistor wire 20a.
  • the processor circuit 402 can also calculate the resistance Rb of the second thermistor wire 20b according to the voltage output by the second sub-voltage source 30b and the current collected by the current collection circuit 420b in the second control assembly 401b.
  • the processor circuit 402 can obtain the same, so the resistance Ra of the first thermistor wire 20a or the resistance Ra of the second thermistor wire 20a
  • the resistance Rb of the thermistor wire 20b can be used as the resistance obtained by the processor circuit 402 .
  • the temperature of the resistance wire 20a drops as shown in FIG. 5B .
  • the temperature of the first thermistor wire 20a drops to Ta- ⁇ T.
  • the particle convective heat transfer formed by the reciprocating motion of the medium particle will be transferred to the second thermistor wire 20b on the side away from the sound wave, so that the heat of the second thermistor wire 20b will increase, as shown in Figure 13 for example , the temperature of the second thermistor wire 20b increases to Tb+ ⁇ T.
  • the sound waves will cause the temperature of the first thermistor wire 20a and the second thermistor wire 20b to be different, thereby As a result, the actual resistance value (Ra- ⁇ R) of the first thermistor wire 20a is different from the actual resistance value (Ra+ ⁇ R) of the second thermistor wire 20b.
  • the processor circuit 402 needs to calculate the actual resistance value of the first thermistor wire 20a (Ra- ⁇ R) is added to the actual resistance value (Ra+ ⁇ R) of the second thermistor wire 20b and the average value is calculated as the above resistance. Therefore, the influence of the resistance change ⁇ R of the first thermistor wire 20a or the second thermistor wire 20b caused by the sound wave on the calculated resistance can be eliminated.
  • control the voltage source to output the first voltage at the first ambient temperature, and output the second voltage at the second ambient temperature.
  • the processor circuit 402 outputs a voltage control command to the voltage control circuit 410b in the second control component 401b, so that the second sub-voltage source 30b electrically connected to the voltage control circuit 410b outputs the second sub-voltage source 30b under the first ambient temperature T1.
  • a voltage U1 at a second ambient temperature T2, outputs a second voltage U2.
  • the first thermistor wire 20a and the second thermistor wire 20b are at the same ambient temperature.
  • the received temperature is the same.
  • both the first thermistor wire 20a and the second thermistor wire 20b receive the first voltage U1
  • the first thermistor wire 20a and the second thermistor wire 20b both receive the above-mentioned second voltage U2.
  • the above-mentioned first voltage U1 may be greater than the second voltage U2.
  • the voltage applied to the first thermistor wire 20a and the second thermistor wire 20b can be reduced from the first voltage U1 to The second voltage U2.
  • the voltage applied to the first thermistor wire 20a and the second thermistor wire 20b can be increased from the second voltage U2 to The first voltage U1. In this way, by adjusting the voltage applied to the first thermistor wire 20a and the second thermistor wire 20b, fluctuations in the performance of the microphone module 02 caused by the ambient temperature are reduced.
  • the third control assembly 401c can control the voltage output by the third sub-voltage source 30c to be the same as the voltage output by the first sub-voltage source 30a and the second sub-voltage source 30b, so that under the same ambient temperature, the third thermistor wire 30c It is the same as the voltage received by the first thermistor wire 20a and the second thermistor wire 20b.
  • the above description is made by taking the example in which the first thermistor wire 20a and the second thermistor wire 20b are respectively electrically connected to different control components. Since the above-mentioned first thermistor wire 20a and the second thermistor wire 20b have the same material and dimensions, the first thermistor wire 20a and the second thermistor wire 20b receive same temperature. Therefore, the voltage control circuit 410a in the first control assembly 401a electrically connected to the first thermistor wire 20a and the voltage control circuit 410b in the second control assembly 401b electrically connected to the second thermistor wire 20b can be shared. Moreover, the first sub-voltage source 30a and the second sub-voltage source 30b may also be shared.
  • the processor circuit 402 may store the first data set DS1 shown in Table 2 and the first data set DS1 shown in Table 3 in the memory 50 of the microphone module 02 before executing the above S102.
  • the first data set DS1 may include multiple resistance value ranges, such as (R1 ⁇ R2), (R2 ⁇ R3), (R3 ⁇ R4) and (R4 ⁇ R5) ... and multiple environmental Temperature, for example, Tes1, Tes2, Tes3 and Tes4....
  • a range of resistance values matches an ambient temperature.
  • the resistance value range (R1 ⁇ R2) matches the ambient temperature Tes1
  • the resistance value range (R2 ⁇ R3) matches the ambient temperature Tes2
  • the resistance value range (R2 ⁇ R3) matches the ambient temperature Tes3
  • the resistance value range (R4 ⁇ R5) match the ambient temperature Tes4.
  • the second data set DS2 includes a plurality of ambient temperature ranges, such as (Tes1 ⁇ Tes2), (Tes2 ⁇ Tes3), (Tes3 ⁇ Tes4) and (Tes4 ⁇ Tes5) ... and a plurality of voltages, For example Uo1, Uo2, Uo3 and Uo4....
  • An ambient temperature range matches a voltage, for example, the ambient temperature range (Tes1 ⁇ Tes2) matches the voltage Uo1, the ambient temperature range (Tes2 ⁇ Tes3) matches the voltage Uo2, and the ambient temperature range (Tes3 ⁇ Tes4) matches the voltage Uo3 Matching, the ambient temperature range (Tes4 ⁇ Tes5) matches the voltage Uo4.
  • the execution of the above S102 by the processor circuit 402 shown in FIG. 13 may include S201 and S202 shown in FIG. 14 .
  • the processor circuit 402 may obtain and obtain the temperature of the thermistor (for example, the first thermistor wire 20a or the second thermistor wire 20b) from the first data set DS1 shown in Table 2 when executing S101. Resistors are located in a resistance value range that matches the ambient temperature. For example, when the above-mentioned resistor is in the resistance range (R1-R2), the processor circuit 402 may acquire the ambient temperature Tes1 matching the resistance range (R1-R2) as the first ambient temperature. Alternatively, when the above-mentioned resistor is in the resistance range (R3-R3), the processor circuit 402 may acquire the ambient temperature Tes2 matching the resistance range (R2-R3) as the second ambient temperature.
  • the thermistor for example, the first thermistor wire 20a or the second thermistor wire 20b
  • the performance of the microphone module 02 can be tested by means of simulation or experimental testing. Under different ambient temperatures, a data set composed of operating temperatures corresponding to the respective ambient temperatures is obtained. And store the above data set in the memory 50.
  • the processor circuit 402 can obtain the working temperature matching the real-time impedance according to the calculated real-time impedance, and then further obtain the ambient temperature matching the working temperature from the working temperature, and the ambient temperature is closer to the thermal The actual temperature of the environment where the sensitive wire is actually located.
  • the voltage is called from the second ambient temperature data set DS2 to improve the accuracy of the finally obtained voltage.
  • the following is a detailed example of the above-mentioned data set having the resistance value of the thermistor wire, the ambient temperature and the working temperature.
  • the above-mentioned first data set DS1 may include the first subset DS1a shown in Table 4 and the second subset DS1b shown in Table 5.
  • the first subset DS1a may include multiple resistance value ranges (R1 ⁇ R2), (R2 ⁇ R3), (R3 ⁇ R4) and (R4 ⁇ R5)...and multiple operating temperature ranges (Tw1-Tw2), (Tw2-Tw3), (Tw3-Tw4), and (Tw4-Tw5)....
  • a resistance value range matches an operating temperature range, for example, the resistance value range (R1 ⁇ R2) matches the operating temperature range (Tw1 ⁇ Tw2), the resistance value range (R2 ⁇ R3) matches the operating temperature range (Tw2 ⁇ Tw3) Matching, the resistance value range (R3-R4) matches the working temperature range (Tw3-Tw4), and the resistance value range (R4-R5) matches the working temperature range (Tw4-Tw5).
  • the second subset DS1b includes multiple operating temperature ranges (Tw1 ⁇ Tw2), (Tw2 ⁇ Tw3), (Tw3 ⁇ Tw4) and (Tw4 ⁇ Tw5) ... and multiple ambient temperatures, for example , Tes1, Tes2, Tes3 and Tes4... .
  • a working temperature range matches an ambient temperature, for example, the temperature range (Tw1 ⁇ Tw2) matches the ambient temperature Tes1, the temperature range (Tw2 ⁇ Tw3) matches the ambient temperature Tes2, and the temperature range (Tw,3 ⁇ Tw4) matches the The ambient temperature Tes3 matches, and the temperature range (Tw4-Tw5) matches the ambient temperature Tes4.
  • the execution of the above S201 by the processor circuit 402 in the controller 40 may include:
  • the processor circuit 402 can acquire the working temperature matching the resistance value range of the resistor from the first subset DS1a shown in Table 4. For example, when the above-mentioned resistance is in the resistance value range (R1-R2), the processor circuit 402 can obtain the working temperature range (Tw1-Tw2) matching the resistance value range (R1-R2) as the first working temperature range . Or, when the above-mentioned resistance is in the resistance value range (R3-R3), the processor circuit 402 can acquire the working temperature range (Tw2-Tw3) matching the resistance value range (R2-R3) as the second working temperature range .
  • the processor circuit 402 obtains the ambient temperature Tes1 matching the first working temperature range (Tw1-Tw2) from the second subset DS1b shown in Table 5 as the first ambient temperature, or, from the second subset DS1b
  • the second ambient temperature Tes1 matching the second working temperature range (Tw2 ⁇ Tw3) is obtained from the second subset DS1b.
  • the processor circuit 402 in the controller 40 can pass the collected resistance and obtain the first data set DS1 (including the first subset DS1a and the second subset DS1a) stored in the memory 50.
  • the subset DS1b the ambient temperature matching the resistance is retrieved. Therefore, the accuracy of the resistance value will ultimately affect the accuracy of the acquired ambient temperature.
  • the microphone module 02 may further include a temperature detector 51 .
  • the temperature detector 51 is electrically connected to the controller 40, and is arranged near the second thermistor wire 20b (or, the first thermistor wire 20a), and the temperature detector 51 is used to collect the second thermistor wire 20b (or, the first thermistor wire 20a ), and transmit the collected signal to the processor circuit 402 in the controller 40 .
  • the signal collected by the temperature detector 51 may be the first signal.
  • the processor circuit 402 in the controller 40 obtains the first operating temperature range or the second operating temperature range matching the resistance value range of the resistor from the first subset DS1a, and then obtains the first operating temperature range or the second operating temperature range from the second subset DS1b Before obtaining the first ambient temperature matching the first operating temperature range, or obtaining the second ambient temperature matching the second operating temperature range from the second subset, the processor circuit 402 is also used to determine whether the temperature detector 51 Collect whether the temperature of the thermistor wire is within the first working temperature range or the second working temperature range.
  • the processor circuit 402 is used to obtain the ambient temperature matching the working temperature range from the second subset DS1b including:
  • the first ambient temperature matching the first working temperature range is obtained from the second subset DS1b, or obtained from the second subset A second ambient temperature matching the second operating temperature range.
  • the processor circuit 402 obtains the resistance of the thermistor wire again.
  • the processor circuit 402 retrieves the working environment temperature range from the memory 50 according to the acquired resistance, it can determine whether the temperature of the thermistor wire collected by the temperature detector 51 falls within the working environment temperature range . If the temperature falls within the working environment temperature range, it means that the resistance obtained by the processor circuit 402 is accurate, so that the ambient temperature matching the ambient temperature range can be continuously obtained according to the above ambient temperature range.
  • the processor circuit 402 may execute the following S202 to obtain a voltage that matches the ambient temperature.
  • the above is based on the processor circuit 402 in the controller 40 judging whether the temperature of the thermistor wire collected by the temperature detector 51 is within the working temperature range to determine the thermal temperature calculated by the processor circuit 402. Whether the resistance of the resistance wire is accurate is judged.
  • the ambient temperature of the thermistor wire is obtained through the resistance of the thermistor wire, and the following S202 is executed to obtain a voltage matching the ambient temperature.
  • the processor circuit 402 can obtain the ambient temperature of the thermistor wire directly through the temperature of the thermistor wire collected by the temperature detector 51 without calculating the resistance of the thermistor wire, And execute the following S202 to obtain the voltage matching the ambient temperature.
  • the processor circuit 402 in the controller 40 acquires the voltage Uo1 matching the first ambient temperature range (Tes1-Tes2) from the second data set DS2 shown in Table 3 during the process of executing the above S202 , as the first voltage, and control the above-mentioned voltage sources, such as the first sub-voltage source 30a, the second sub-voltage source 30b and the third sub-voltage source 30c shown in FIG.
  • the second thermistor wire 20b and the third thermistor wire 20c output the aforementioned voltage Uo1.
  • the processor circuit 402 in the controller 40 acquires the voltage Uo2 matching the second ambient temperature range (Tes2-Tes1) from the second data set DS2 shown in Table 3 during the process of executing the above S202, As the second voltage, and control the above-mentioned voltage sources, such as the first sub-voltage source 30a, the second sub-voltage source 30b and the third sub-voltage source 30c shown in FIG.
  • the thermistor wire 20b and the third thermistor wire 20c output the aforementioned voltage Uo2.
  • the voltage received by the thermistor wire is the voltage Uo1 as the first voltage U1
  • the voltage received by the thermistor wire is the voltage Uo2 as the second voltage U2.
  • the degree of temperature change ⁇ T of the thermistor wire is proportional to the thermal diffusivity D of the medium.
  • formula (5) that the greater the temperature change ⁇ T of the thermistor wire, the greater the voltage difference ⁇ u 0 at the output terminals of the first thermistor wire 20a and the second thermistor wire 20b.
  • the voltage difference ⁇ u 0 is proportional to the sensitivity of the microphone module 02 . Therefore, the higher the thermal diffusivity D of the medium where the microphone module 02 is located, that is, the higher the ambient temperature, the higher the sensitivity of the microphone module 02 .
  • the temperature of the environment where the microphone module 02 is located cannot be unlimitedly high. When the ambient temperature is too high, the thermistor wire will be damaged, so that the microphone module 02 cannot work normally.
  • the processor circuit 402 can also be based on the voltage output by the third sub-voltage source 30c, and the first The current collected by the current collection circuit 420c in the third control component 401c is used to calculate the resistance Rc of the third thermistor wire 20c.
  • the temperature of the above three thermistor wires can be obtained by obtaining the resistance Rc of the third thermistor wire 20c.
  • a warning signal such as a buzzer or a flashing light, can be sent to remind the user that the temperature of the microphone module 02 is too high, and the microphone module 02 can be properly turned off, or the high-performance mode can be switched to save electric mode.
  • the voltage at the second end of the first thermistor wire 20a or the second thermistor wire 20b can be detected.
  • the voltage is too large, the first thermistor wire 20a and the second thermistor wire 20b
  • the temperature of the second thermistor wire 20b is higher, and it is possible to stop applying voltage to the third thermistor wire 20c, and the third thermistor wire 20c is no longer applied to the first thermistor wire 20a and the second thermistor wire 20b.
  • a temperature field is provided so as to reduce the temperature of the first thermistor wire 20a and the second thermistor wire 20b.
  • the third control component 401c and the third voltage source 30c electrically connected to the third thermistor wire 20c may not be provided in the above-mentioned microphone module 02 .
  • the third thermistor wire 20c may share a voltage source with the first thermistor wire 20a or the second thermistor wire 20b.
  • the above-mentioned microphone module 02 may include a switch (taking a switch M as an example), an inductor L and a comparator 60 .
  • the above switch can be connected in series with the third thermistor wire 20c as a heating element.
  • the gate terminal of the switch receives the control signal, and the switch is selectively turned on based on the control signal.
  • the switch when the switch is a switch tube M, the first pole k1 of the switch tube M is electrically connected to the second end g2 of the third thermistor wire 20c, and the second pole k2 of the switch tube M is grounded.
  • the first end l1 of the inductor L is electrically connected to the second end c2 of the second thermistor wire 20b (or, the second end b2 of the first thermistor wire 20a ).
  • the first end m1 of the capacitor C is electrically connected to the second end l2 of the inductor L, and the second end m2 of the capacitor C is grounded.
  • the inductor L and the capacitor C can form a filter circuit for filtering signals.
  • the first input end of the comparator 60 (for example, the end marked with “+”) is electrically connected to the second end l2 of the inductor L.
  • the second input terminal of the comparator 60 (for example, the terminal marked with “-”) is used to receive the reference voltage Vref.
  • the output terminal of the comparator 60 is electrically connected with the gate terminal k3 of the switch tube M, for example, the gate.
  • the comparator 60 is used to output a control signal to the gate of the switch tube M to control the switch tube M to cut off if the voltage V0 of the first input terminal of the comparator 60 is greater than the reference voltage Vref.
  • the voltage at the first input end of 60 is lower than the reference voltage Vref, and then a control signal is output to the gate end of the switch tube M to control the switch tube M to be turned on.
  • the comparator 60 is also electrically connected to the first working voltage terminal VDD and the second working voltage terminal VSS. There is a voltage difference between the first working voltage terminal VDD and the second working voltage terminal VSS to drive the comparator 60 to work.
  • the above-mentioned switching tube M can be a field effect transistor (field effect transistor, EFT), the first pole k1 of the switching tube M can be a source (source), the second pole k2 can be a drain (drain), or the switching tube M The first pole k1 can be a drain, and the second pole k2 can be a source.
  • the switch tube M can be an N-type transistor or a P-type transistor.
  • the switch tube M is a P-type transistor
  • the comparison result of the comparator 60 is V1>Vref
  • the current applied to the second thermistor wire 20b and the first thermistor wire 20a The voltage is larger, the temperature of the second thermistor wire 20b and the first thermistor wire 20a is too high, in order to avoid the failure of the second thermistor wire 20b and the first thermistor wire 20a, the comparator 60 can output High level, at this time the switch tube M is cut off.
  • the third thermistor wire 20c is disconnected from the ground terminal GND, and no current flows through the third thermistor wire 20c, so that the third thermistor wire 20c no longer flows to the first thermistor wire.
  • 20a and the second thermistor wire 20b provide a temperature field, so as to reduce the temperature of the first thermistor wire 20a and the second thermistor wire 20b.
  • the comparison result of the comparator 60 is V1 ⁇ Vref
  • the voltages applied to the second thermistor wire 20b and the first thermistor wire 20a are relatively small, and the second thermistor wire 20b and the first thermistor wire
  • the temperature of the thermistor wire 20a will not cause failure of the second thermistor wire 20b and the first thermistor wire 20a.
  • the comparator 60 can output a low level, and the switch M is turned on at this moment.
  • the third thermistor wire 20c is electrically connected to the ground terminal GND, and the current flows through the third thermistor wire 20c, so that the third thermistor wire 20c flows to the first thermistor wire 20a and the first thermistor wire 20a.
  • the second thermistor wire 20b provides a temperature field to improve the sensitivity of the microphone module 02 .
  • the switching tube M is an N-type transistor
  • the comparison result of the comparator 60 when the comparison result of the comparator 60 is V1>Vref, the current applied to the second thermistor wire 20b and the first thermistor wire 20a If the voltage is large, the temperature of the second thermistor wire 20b and the first thermistor wire 20a is too high.
  • the comparator 60 can output a low level, and the switch tube M is turned off at this time.
  • the comparison result of the comparator 60 is V1 ⁇ Vref
  • the voltages applied to the second thermistor wire 20b and the first thermistor wire 20a are relatively small, and the second thermistor wire 20b and the first thermistor wire
  • the temperature of the thermistor wire 20a will not cause failure of the second thermistor wire 20b and the first thermistor wire 20a.
  • the comparator 60 can output a high level, and the switch M is turned on at this moment.
  • the microphone module 02 may further include an operational amplifier 61 .
  • the microphone module 02 may further include a noise reduction circuit 62 , an analog to digital converter (analog to digital converter, ADC) 63 and a digital signal processor 64 as shown in FIG. 18 .
  • the noise reduction circuit 62 is electrically connected between the second end b2 of the first thermistor wire 20a and the first input end of the operational amplifier 61, and the noise reduction circuit 62 is also electrically connected to the second end b2 of the second thermistor wire 20b. Between the two terminals c1 and the second input terminal of the operational amplifier.
  • the noise reduction circuit 62 is used to perform noise reduction processing on the voltage difference ⁇ u 0 .
  • the noise reduction circuit 62 may include multi-stage sub-noise reduction circuits, and the sub-noise reduction circuits may reduce noise step by step to improve the noise reduction effect.
  • the input end of the analog-to-digital converter 63 is electrically connected to the output end of the operational amplifier 61 , and the analog-to-digital converter 63 is used to convert the analog signal output by the operational amplifier 61 into a digital signal.
  • the input terminal of the digital signal processor 64 is electrically connected with the output terminal of the analog-to-digital converter 63 .
  • the digital signal processor 64 is configured to perform at least one of noise reduction processing, reverberation cancellation processing (for example, elimination of ambient reverberation) or echo cancellation processing on the digital signal output by the analog-to-digital converter 63 .
  • the controller 40 in the microphone module 02 controls the voltage source to output different voltages according to the different ambient temperatures of the thermistor wire, so as to reduce the fluctuation of the performance of the microphone module 02 affected by the ambient temperature.
  • the microphone module 02 provided in other embodiments of the present application may include a controller 40 , a voltage converter 70 , and at least two of the above-mentioned at least one heating element and at least one thermistor.
  • the heating element may be a first thermistor wire 20a
  • the thermistor may be a second thermistor wire 20b.
  • the controller 40 may be electrically connected with the voltage converter 70 .
  • the voltage converter 70 has a voltage terminal 701, which is electrically connected to the first thermistor wire 20a and the second thermistor wire 20b.
  • the voltage converter 70 is used to output different voltages according to the above-mentioned first signal.
  • the voltage converter 70 can output the first voltage U1 at the first ambient temperature T1 and output the second voltage U2 at the second ambient temperature T2 according to the first signal.
  • the first thermistor wire 20a and the second thermistor wire 20b are used to receive the acoustic wave signal and the voltage terminal 701 of the voltage converter 70 to output an electrical signal, the first thermistor wire 20a and the second thermistor wire
  • the resistance of the wire 20b is used to change under the action of the acoustic wave signal.
  • the controller 40 can obtain the resistance of the thermistor wire, and retrieve a voltage matching the real-time resistance value from the memory 50 according to the resistance.
  • the specific process of obtaining the voltage by the controller 40 is the same as that described above, and will not be repeated here.
  • the controller 40 can control the ratio of the output voltage of the voltage converter 70 to the input voltage according to the obtained voltage, so that the voltage converter 70 can output the voltage obtained by the controller 40 to be applied to the first A thermistor wire 20a and a second thermistor wire 20b.
  • the technical effect of the microphone module 02 having the above-mentioned voltage converter 70 is the same as that described above, and will not be repeated here.
  • the microphone module 02 with the above-mentioned voltage converter 70 may also include the above-mentioned operational amplifier, at least one stage of noise reduction circuit, an analog-to-digital converter, and a digital signal processor.
  • the connection relationship and functions of the operational amplifier, noise reduction circuit, analog-to-digital converter, and digital signal processor are the same as those described above, and will not be repeated here.
  • the microphone module 02 includes two thermistor wires, such as the first thermistor wire 20 a and the second thermistor wire 20 b .
  • the microphone module 02 may further include the above-mentioned third thermistor wire 20c.
  • the technical effect of the third thermistor wire 20c is the same as that described above, and will not be repeated here.
  • the switch tube M when the switch tube M is an N-type transistor, in order to avoid failure of the second thermistor wire 20b and the first thermistor wire 20a due to excessive temperature, when the comparator 60 When the comparison result of V1 is less than but close to the reference voltage Vref, the switch tube M can be controlled to be turned on, and the voltage applied to the third thermistor wire 20c can be reduced to reduce the heat of the third thermistor wire 20c, Therefore, the heat received by the second thermistor wire 20b and the first thermistor wire 20a from the third thermistor wire 20c is reduced.
  • the switch tube M when the temperature of the second thermistor wire 20b and the first thermistor wire 20a is low, that is, when the comparison result of the comparator 60 is that V1 is much smaller than the reference voltage Vref, while the switch tube M can be controlled to be turned on, the voltage applied to the third thermistor wire 20c can be increased to increase the heat of the third thermistor wire 20c, thereby increasing the heat of the second thermistor wire 20b and the first thermal resistance wire 20b.
  • the sensitive wire 20a receives heat from the third thermistor wire 20c.
  • the fluid detection device 01 such as the microphone module 02
  • the fluid detection device 01 is the above-mentioned two-wire model (that is, includes the first thermistor wire 20a and the second thermistor wire 20b), or is the above-mentioned In the case of the three-wire model (that is, including the first thermistor wire 20a, the second thermistor wire 20b, and the third thermistor wire 20c)
  • the temperature of the environment where the fluid detection device 01 is located changes, it can A thermistor wire 20a and a second thermistor wire 20b provide a fixed voltage.
  • the switch tube M is controlled to be off or on, or when the switch tube M is turned on, the control is applied to the third thermistor wire. 20c for the purpose of adjusting the temperature of the second thermistor wire 20b and the first thermistor wire 20a.
  • the specific adjustment process is the same as that described above, and will not be repeated here.
  • an embodiment of the present application provides a computer-readable storage medium.
  • the computer-readable medium includes computer instructions, and when the computer instructions are run on the controller 40, the controller 40 is made to execute any one of the above-mentioned control methods.
  • the technical effects of the computer-readable storage medium are the same as those described above, and will not be repeated here.
  • the embodiment of the present application also provides a computer program product.
  • the computer program product includes computer instructions, and when the computer instructions are run on the controller 40, the controller 40 is made to execute any one of the above-mentioned control methods.
  • the technical effect of the computer program product is the same as that described above, and will not be repeated here.
  • all or part of them may be implemented by software, hardware, firmware or any combination thereof.
  • a software program When implemented using a software program, it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • computer-executed instructions When computer-executed instructions are loaded and executed on a computer, the processes or functions according to the embodiments of the present application are generated in whole or in part.
  • a computer can be a general purpose computer, special purpose computer, computer network, or other programmable device.
  • Computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, e.g.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer, or may contain one or more data storage devices such as servers and data centers that can be integrated with the medium.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, or a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (solid state disk, SSD)), etc.

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  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

Les modes de réalisation de la présente demande se rapportent au domaine technique de la mesure de fluide. L'invention concerne un appareil de détection de fluide et son procédé de commande, et un dispositif électronique, qui sont utilisés pour réduire les fluctuations des performances de l'appareil de détection de fluide en fonction du changement de température ambiante. L'appareil de détection de fluide comprend une source de tension, au moins un élément chauffant, au moins une thermistance et un dispositif de commande. La thermistance génère un premier signal correspondant à la température de la thermistance. Lorsque la température ambiante de la thermistance est une première température ambiante, la source de tension délivre au moins une première tension à la thermistance, et lorsque la température ambiante de la thermistance change de la première température ambiante à une seconde température ambiante, la source de tension délivre au moins une seconde tension à la thermistance, de telle sorte qu'un module de microphone peut toujours maintenir une performance relativement élevée.
PCT/CN2022/111843 2021-08-20 2022-08-11 Appareil de détection de fluide et son procédé de commande, et dispositif électronique WO2023020362A1 (fr)

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CN202110961300.6A CN115942213A (zh) 2021-08-20 2021-08-20 一种流体检测装置及控制方法、电子设备

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CN117594895B (zh) * 2024-01-18 2024-03-29 深圳市特普生科技有限公司 电池温度监测组件、电池系统及电池温度监测方法

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US6539791B1 (en) * 1998-10-02 2003-04-01 Weber Guenther Method and apparatus for measuring flow based on heat transfer from a flowing medium
US20050092078A1 (en) * 2003-10-31 2005-05-05 Degree C Pulsed thermistor sensor
CN103080703A (zh) * 2010-09-08 2013-05-01 日立汽车系统株式会社 气体流量测量装置
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CN106383248A (zh) * 2016-10-27 2017-02-08 广东奥迪威传感科技股份有限公司 基于热敏电阻的测速装置
CN111164419A (zh) * 2017-09-26 2020-05-15 Tdk株式会社 气体传感器

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6539791B1 (en) * 1998-10-02 2003-04-01 Weber Guenther Method and apparatus for measuring flow based on heat transfer from a flowing medium
US20050092078A1 (en) * 2003-10-31 2005-05-05 Degree C Pulsed thermistor sensor
CN103080703A (zh) * 2010-09-08 2013-05-01 日立汽车系统株式会社 气体流量测量装置
TW201546455A (zh) * 2014-03-20 2015-12-16 Varian Semiconductor Equipment 熱敏電阻式測量系統
CN106383248A (zh) * 2016-10-27 2017-02-08 广东奥迪威传感科技股份有限公司 基于热敏电阻的测速装置
CN111164419A (zh) * 2017-09-26 2020-05-15 Tdk株式会社 气体传感器

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