CN217982160U - Conditioning circuit, chip and electronic equipment - Google Patents
Conditioning circuit, chip and electronic equipment Download PDFInfo
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- CN217982160U CN217982160U CN202221632879.8U CN202221632879U CN217982160U CN 217982160 U CN217982160 U CN 217982160U CN 202221632879 U CN202221632879 U CN 202221632879U CN 217982160 U CN217982160 U CN 217982160U
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Abstract
The application provides a conditioning circuit, a chip and electronic equipment, wherein the conditioning circuit is used for being connected with an external gas sensor, and the gas sensor comprises a first electrode and a second electrode; the conditioning circuit includes: the power interface is used for connecting a power supply to receive a power signal; and the first end of the switch module is connected to the first electrode, the second end of the switch module is connected to the second electrode, the control end of the switch module is connected to the power interface, and the switch module is used for switching off according to the power signal when the power supply is powered on and switching on when the power supply is powered off. This application is through making the technological means of first electrode and second electrode short circuit when gas sensor is out of work, and the electric charge of two electrode accumulations of gas sensor during operation reduces gas sensor's consumption, can solve the short technical problem of gas sensor life.
Description
Technical Field
The application relates to the technical field of electronics, in particular to a conditioning circuit, a chip and electronic equipment.
Background
The electrochemical gas sensor operates by undergoing an oxidation reaction or a reduction reaction with a measured gas and generating an electrical signal proportional to the gas concentration, and generally, the life span of the electrochemical gas sensor is generally 1 to 2 years. After the electrochemical gas sensor is put into use, the spring or the conductor between the working electrode and the counter electrode can be removed, after the measurement is finished, the working electrode and the counter electrode can not be in short circuit, and the accumulated charges at the two electrode ends can not be released, so that the power consumption of the electrochemical gas sensor is increased, the aging of the electrochemical gas sensor can be accelerated under the condition of limited service life, and the service life of the electrochemical gas sensor is shortened.
SUMMERY OF THE UTILITY MODEL
The application provides a conditioning circuit, chip and electronic equipment, its main aim at releases the electric charge of accumulation on first electrode and the second electrode when gas sensor is out of work, reduces gas sensor's consumption, effectively prolongs gas sensor's life-span.
In a first aspect, an embodiment of the present application provides a conditioning circuit, configured to be connected to an external gas sensor, where the gas sensor includes a first electrode and a second electrode; the conditioning circuit includes:
the power interface is used for connecting a power supply to receive a power signal;
and
the first end of the switch module is connected with the first electrode, the second end of the switch module is connected with the second electrode, the control end of the switch module is connected with the power interface, and the switch module is used for switching off the power supply according to the power signal when the power supply is powered on and switching on the power supply when the power supply is powered off.
Preferably, the conditioning circuit further comprises a current detection circuit, a first input end of the current detection circuit is used for connecting the first electrode, and a second input end of the current detection circuit is used for connecting the second electrode.
Preferably, the gas sensor comprises an electrochemical gas sensor, the first electrode being a reference electrode and the second electrode being a working electrode.
Preferably, the switching module comprises a P-type field effect transistor.
Preferably, the switch module comprises a PNP-type transistor.
Preferably, the switch module includes a controller, a first output end of the controller is a first end of the switch module, a second output end of the controller is a second end of the switch module, and an enable end of the controller is a control end of the switch module.
Preferably, the conditioning circuit further comprises an amplifying circuit and a voltage dividing circuit;
one end of the amplifying circuit is connected with the output end of the current detection circuit, the other end of the amplifying circuit is connected with one end of the voltage division circuit, and the amplifying circuit is used for amplifying the current when the gas sensor works;
the voltage division circuit is used for obtaining a corresponding detection signal according to the amplified current.
Preferably, the amplifying circuit comprises a current amplifier, and the voltage dividing circuit is formed by sequentially connecting a plurality of resistors in series.
In a second aspect, embodiments of the present application provide an electrochemical gas sensor comprising any one of the conditioning circuits provided in the first aspect above.
In a third aspect, an embodiment of the present application provides a chip including any one of the conditioning circuits provided in the first aspect.
The application provides a conditioning circuit, chip and electronic equipment, this conditioning circuit is used for being connected with the gas sensor that needs increase of service life, when this gas sensor is out of work, the connection of disconnection power source interface and power, signal is turned off, switch module's first end and second end are connected, gas sensor's first electrode and second electrode are connected promptly, thereby make gas sensor external connection of first electrode and second electrode switch on when out of work, release gas sensor during operation accumulated electric charge, thereby reduce gas sensor's consumption, prolong gas sensor's life.
Drawings
Fig. 1 is a schematic view of an application scenario of a conditioning circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a conditioning circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a conditioning circuit according to an embodiment of the present application;
fig. 4 is a schematic diagram illustrating a specific structure of a conditioning circuit when the switch module is a P-type fet in the embodiment of the present application;
fig. 5 is a schematic diagram illustrating a specific structure of the conditioning circuit when the switch module is a PNP transistor in the embodiment of the present application;
fig. 6 is a schematic structural diagram of a conditioning circuit according to an embodiment of the present application.
Description of the reference numerals:
a conditioning circuit, 100; a gas sensor, 110;
a power supply, 120; a first electrode, 111;
a second electrode, 112; a power interface, 101;
a switch module, 102; a current detection circuit, 103;
an amplifying circuit, 104; a voltage divider circuit 105;
output interface, 106.
The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.
Detailed Description
Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present application and are not to be construed as limiting the present application.
In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be apparent that the described embodiments are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the embodiments of the present application, at least one means one or more; plural means two or more. In the description of the present application, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, nor order.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, the terms "including," "comprising," "having," and variations thereof in this specification mean "including, but not limited to," unless expressly specified otherwise.
It is to be noted that "connected" in the embodiments of the present application may be understood as an electrical connection, and the connection of two electrical components may be a direct or indirect connection between the two electrical components. For example, a and B may be connected directly, or indirectly through one or more other electrical components.
In order to prolong the service life of the existing electrochemical gas sensor, the application provides a conditioning circuit which can be regarded as an auxiliary circuit of the gas sensor and is used for assisting the gas sensor to prolong the service life and outputting a required signal. Fig. 1 is a schematic view of an application scenario of a conditioning circuit according to an embodiment of the present disclosure, and as shown in fig. 1, the conditioning circuit 100 may be applied in a gas sensor 110. When the gas sensor 110 needs to be used, the power supply 120 connected with the power interface 101 is turned on, the first electrode 111 and the second electrode 112 are disconnected, and the gas sensor 110 works normally; when the gas sensor 110 is not needed to be used, the power supply 120 connected to the power interface 101 is turned off, and the first electrode 111 and the second electrode 112 are short-circuited, so that electric charges generated when the gas sensor 110 works are discharged, and the power consumption of the gas sensor 110 is reduced, thereby prolonging the service life of the gas sensor 110.
Fig. 2 is a schematic structural diagram of a conditioning circuit provided in an embodiment of the present application, and as shown in fig. 2, the conditioning circuit 100 is used for connecting an external gas sensor 110, where the gas sensor 110 includes a first electrode 111 and a second electrode 112; the conditioning circuit 100 includes:
a power interface 101 for connecting a power source to receive a power signal; and
a switch module 102, a first end of the switch module 102 is connected to the first electrode 111, a second end of the switch module 102 is connected to the second electrode 112, a control end of the switch module 102 is connected to the power interface 101, and the switch module 102 is configured to turn off according to the power signal when the power supply is powered on and turn on when the power supply is powered off.
The conditioning circuit 100 provided in the embodiment of the present application includes a power interface 101 and a switch module 102, where the power interface 101 is an interface for connecting the conditioning circuit 100 with a power source 120, and as an example, the power interface 101 may be a commonly-used battery interface, and the power source 120 is provided for the conditioning circuit 100 through a battery, and the battery is small, light, and cheap, so that the size of the conditioning circuit 100 can be reduced, and the cost can be reduced; as an example, the power source 120 may be a common constant voltage source or a storage battery of 5V, 12V, 15V, etc., and is fixedly connected to the power interface 101, the constant voltage source has a switch, the supply of voltage is realized by opening and closing the switch, and the stable power source 120 voltage is provided for the conditioning circuit 100 by connecting the constant voltage source, which may meet the usage requirement in some scenarios without the power source 120; the specific situation of the connection between the power interface 101 and the power source 120 can be determined according to actual situations, and the embodiment of the present application is not limited in detail herein.
The switch module 102 includes a first end, a second end and a control end, the first end of the switch module 102 is connected to the first electrode 111 of the gas sensor 110, the second end of the switch module 102 is connected to the second electrode 112 of the gas sensor 110, the control end of the switch module 102 is connected to the power interface 101, if the power signal connected to the control end of the switch module 102 is turned off, that is, the voltage at the control end of the switch module 102 is 0, the first end and the second end of the switch module 102 are turned on, and if the voltage at the control end of the switch module 102 is the power voltage, the first end and the second end of the switch module 102 are turned off. The switch module 102 may be an analog circuit formed by assembling components such as a diode, a triode, a field effect transistor, a resistor, a power supply and the like according to a circuit design rule; the switch module 102 may also be a digital circuit formed by connecting digital devices such as a clock chip, a trigger, and a selector according to a digital circuit connection rule, for example, the switch module 102 may be a Programmable embedded processor 320, which is commonly referred to as a single chip microcomputer (scm), a Field Programmable Gate Array (FPGA), and the like, and explained by taking the scm as an example, a signal input end of the scm is connected to the power interface 101 as a control end, two signal output ends are respectively connected to the first electrode 111 and the second electrode 112, and if a voltage of the control end is a low level, the first end and the second end are controlled to be conducted, so that the first electrode 111 and the second electrode 112 are connected together to realize charge release. The switch module 102 may be determined according to actual conditions, and the embodiment of the present application is not specifically limited herein.
The gas sensor 110 included in the embodiment of the present application is a sensor for detecting a gas concentration, and generates a current proportional to the gas concentration when detecting the gas concentration, and calculates the gas concentration from a correspondence relationship between the magnitude of the current and the gas concentration. When the conditioning circuit 100 is used to assist the gas sensor 110, when the gas sensor 110 works, the power switch connected to the power interface 101 is turned on, and the control end of the switch module 102 receives a power-on signal from the power supply, and then the first end and the second end are controlled to be disconnected, that is, the first electrode 111 and the second electrode 112 of the gas sensor 110 are externally disconnected, so that the gas sensor 110 works normally; when the gas sensor 110 does not work, the power switch connected to the power interface 101 is turned off, and the control terminal of the switch module 102 controls the external conductive connection of the first terminal and the second terminal, that is, the first electrode 111 and the second electrode 112 of the gas sensor 110 are externally conductive, so as to discharge charges accumulated when the gas sensor 110 works, thereby reducing the power consumption of the gas sensor 110 and prolonging the service life of the gas sensor 110.
The application provides a conditioning circuit 100, this conditioning circuit 100 is used for being connected with the gas sensor 110 that needs the extension life, when this gas sensor 110 is out of work, disconnect power interface 101 and the connection of power, the mains signal is closed, the first end and the second end of switch module 102 are connected, namely first electrode 111 and the second electrode 112 of gas sensor 110 are connected, thereby make gas sensor 110 external connection of first electrode 111 and second electrode 112 switch on when out of work, release the electric charge that gas sensor 110 accumulated when working, thereby reduce the power consumption of gas sensor 110, prolong the life of gas sensor 110.
On the basis of the foregoing embodiment, preferably, fig. 3 is a schematic structural diagram of a conditioning circuit provided in an embodiment of the present application, and as shown in fig. 3, the conditioning circuit 100 further includes a current detection circuit 103, a first input end of the current detection circuit 103 is used for connecting the first electrode 111, and a second input end of the current detection circuit 103 is used for connecting the second electrode 112.
The conditioning circuit 100 provided in the embodiment of the present application is mainly applied to the gas sensor 110, the gas sensor 110 is for measuring a gas concentration, and the gas concentration is calculated according to a current magnitude, therefore, the conditioning circuit 100 further includes a current detection circuit 103 in the embodiment of the present application, a first input end of the current detection circuit 103 is connected to the first electrode 111 of the gas sensor 110, a second input end of the current detection circuit 103 is connected to the second electrode 112 of the gas sensor 110, and when the gas sensor 110 operates, the current detection circuit 103 measures a current magnitude of the gas sensor 110 during operation, and obtains a corresponding current signal magnitude. The current detection circuit 103 may be a current detection analog circuit or a current detection chip, and may be determined specifically according to an actual situation, and the embodiment of the present application is not specifically limited herein.
The current that produces gas sensor 110 through current detection circuit 103 in this application embodiment measures, can obtain the electric current size, when needs calculate the gas concentration that awaits measuring, directly just can calculate according to the computational formula according to this electric current size, convenient and fast.
On the basis of the above embodiment, preferably, the gas sensor 110 includes an electrochemical gas sensor, the first electrode 111 is a reference electrode, and the second electrode 112 is a working electrode.
Specifically, the gas sensor 110 in the embodiment of the present application is specifically an electrochemical gas sensor, and the first electrode 111 refers to a reference electrode of the electrochemical gas sensor, and the second electrode 112 refers to a working electrode of the electrochemical gas sensor.
The electrochemical gas sensor generally comprises a counter electrode and a working electrode, wherein an oxidation reaction or a reduction reaction is carried out on the working electrode to generate charged ions and electrons, the charged ions and the electrons are transferred to the counter electrode through electrolyte, the reduction reaction or the oxidation reaction is carried out on the counter electrode to generate current which is in direct proportion to the gas concentration, and the corresponding ambient gas concentration can be obtained by measuring the current of a sensor loop. However, in practice, the potential of the sensing electrode cannot be kept constant due to continuous electrochemical reaction on the surface of the electrode, and after a long time, the potential can cause the performance degradation of the electrochemical gas sensor, and a reference electrode is introduced into the electrochemical gas sensor for improving the performance of the electrochemical gas sensor. A reference electrode is mounted in the electrolyte adjacent to the working electrode, and a fixed, steady constant potential is applied to the working electrode, which can be maintained at a fixed voltage value at all times. The molecules of the gas to be detected react with the working electrode, and the current on the counter electrode is measured, and the current magnitude is usually directly related to the concentration of the gas to be detected.
When the conditioning circuit 100 is used for assisting an electrochemical gas sensor, when the electrochemical gas sensor measures the concentration of a gas to be measured, the switch of the power supply 120 is turned on, the control end of the switch module 102 is connected with the power supply interface 101, the first end of the switch module 102 is disconnected from the second end of the switch module 102, that is, the external connection between the working electrode and the reference electrode of the electrochemical gas sensor is disconnected, and the electrochemical gas sensor normally works. The gas to be measured is subjected to oxidation reaction or reduction reaction on the working electrode to generate charged ions and electrons, the charged ions and the electrons are transferred to the counter electrode through electrolyte, reduction reaction or oxidation reaction is carried out on the counter electrode to generate current in direct proportion to the gas concentration, and the gas concentration to be measured can be calculated by measuring the current. When the electrochemical gas sensor does not work, the power interface 101 is disconnected from the power source 120, the first end and the second end of the switch module 102 are conducted, that is, the working electrode and the reference electrode of the electrochemical gas sensor are conducted, that is, the reference electrode and the external connection of the working electrode are always conducted when the electrochemical gas sensor does not work, so that the counter electrode is conducted with the working electrode through the reference electrode, the counter electrode and the working electrode can release charges accumulated when the electrochemical gas sensor works, the power consumption of the electrochemical gas sensor is reduced, and the service life of the electrochemical gas sensor is prolonged.
The application provides a conditioning circuit 100, when this electrochemistry gas sensor is out of work, disconnect power interface 101 and power 120's connection, make switch module 102 first end and second end switch on, electrochemistry gas sensor working electrode switches on with the reference electrode promptly, that is to say at electrochemistry gas sensor external connection of reference electrode and working electrode when out of work switch on always, the counter electrode switches on with the working electrode through the reference electrode, thereby counter electrode and working electrode can release the electric charge that electrochemistry gas sensor during operation accumulated, thereby reduce electrochemistry gas sensor's consumption, increase of service life.
On the basis of the above embodiments, preferably, the switch module 102 includes a P-type field effect transistor.
As an implementation manner, fig. 4 is a schematic structural diagram of a conditioning circuit when a switch module is a P-type field effect transistor in this embodiment, as shown in fig. 4, when the switch module 102 is a P-type field effect transistor, a gate of the field effect transistor is a control terminal of the switch module 102, a source of the field effect transistor is a first terminal of the switch module 102, a drain of the field effect transistor is a second terminal of the switch module 102, and a voltage of a reference electrode is greater than a threshold voltage of the P-type field effect transistor. When the electrochemical gas sensor works, the power interface 101 is connected with the power supply 120, the voltage of the grid g is greater than the voltage of the source s, the source s and the drain d are disconnected, and the electrochemical gas sensor works normally; when the electrochemical gas sensor does not work, the power interface 101 is disconnected from the power supply 120, the voltage of the grid g is 0 and is smaller than the voltage of the source s, and the voltage of the reference electrode is larger than the threshold voltage of the field effect transistor, namely the voltage difference between the voltage of the source s and the voltage of the grid g is larger than the threshold voltage, and the source s and the drain d are conducted, so that charges accumulated when the electrochemical gas sensor works can be released, the power consumption of the electrochemical gas sensor is reduced, and the service life of the electrochemical gas sensor is prolonged.
On the basis of the above embodiments, preferably, the switch module 102 includes a PNP type triode.
As an implementation manner, fig. 5 is a schematic diagram of a specific structure of the conditioning circuit when the switch module is a PNP transistor in this embodiment, as shown in fig. 5, when the switch module 102 is a PNP transistor, a base of the transistor is a control terminal of the switch module 102, an emitter of the transistor is a first terminal of the switch module 102, a collector of the transistor is a second terminal of the switch module 102, and a voltage of the reference electrode is greater than a threshold voltage of the transistor. When the electrochemical gas sensor works, the power interface 101 is connected with the power supply 120, and because the voltage of the power supply 120 is greater than the voltage of the reference electrode, the voltage of the emitter e is less than the voltage of the base b, the emitter e and the collector c are disconnected, and the electrochemical gas sensor works normally; when the electrochemical gas sensor does not work, the power interface 101 is disconnected from the power supply 120, the voltage of the base electrode b is 0 and is smaller than the voltage of the emitter electrode e, and the voltage of the reference electrode is larger than the threshold voltage of the field effect transistor, namely, the voltage difference between the voltage of the emitter electrode e and the voltage of the base electrode b is larger than the threshold voltage of the triode, the emitter electrode e and the collector electrode c are conducted, so that charges accumulated when the electrochemical gas sensor works can be released, the power consumption of the electrochemical gas sensor is reduced, and the service life of the electrochemical gas sensor is prolonged.
It should be noted that, the threshold voltage of a general triode is 0.7V, so the voltage of the reference electrode only needs to be greater than 0.7V.
The embodiment of the application realizes the switch module 102 through a P-type field effect transistor or a PNP-type triode, realizes the function of the switch module 102 through one component, and has the advantages of low cost, small size and simple structure.
On the basis of the foregoing embodiment, preferably, the switch module 102 includes a controller, a first output end of the controller is a first end of the switch module 102, a second output end of the controller is a second end of the switch module 102, and an enable end of the controller is a control end of the switch module 102.
As an implementation manner, in the embodiment of the present application, the switch module 102 includes a controller, the controller includes an enable terminal, a first output terminal, and a second output terminal, the enable terminal of the controller is a control terminal of the switch module 102, the first output terminal of the controller is a first terminal of the switch module 102, and the second output terminal of the controller is a second terminal of the switch module 102. When the enable end of the controller receives a high level, the first output end and the second output end are controlled to be disconnected, and when the enable end of the controller receives a low level, the first output end and the second output end are controlled to be connected in a conducting mode. The controller may be an analog circuit formed by assembling electronic components according to a circuit design rule, or may be a digital circuit formed by connecting digital components according to a digital circuit connection rule, for example, the controller may be a digital processor, which is a final execution unit for information processing and program operation, and is generally implemented by a small microprocessor with simple functions, and common small microprocessors have models of a 51-chip microcomputer, an 8086 and the like. The determination may be specifically performed according to an actual situation, and this is not specifically limited in the embodiment of the present application.
The embodiment of the present application provides a specific structure of the switch module 102, and the controller controls whether the working electrode and the reference electrode of the electrochemical gas sensor are conducted or not according to the corresponding power signal. The switch module 102 may be implemented using digital circuitry; the switch module 102 may be implemented using an analog circuit, if the control accuracy of the electrochemical gas sensor is not high and the control cost is required.
On the basis of the above embodiment, preferably, as shown in fig. 3, the conditioning circuit 100 further includes an amplifying circuit 104 and a voltage dividing circuit 105, one end of the amplifying circuit 104 is connected to the output end of the current detecting circuit 103, the other end of the amplifying circuit 104 is connected to one end of the voltage dividing circuit 105, and the other end of the voltage dividing circuit 105 is grounded, wherein: the amplifying circuit 104 is used for amplifying the current of the electrochemical gas sensor during operation; the voltage dividing circuit 105 is configured to obtain a corresponding detection signal according to the amplified current.
Specifically, the conditioning circuit 100 is configured to condition a current signal and output a required conditioning signal, where the conditioning signal may be a voltage signal or a current signal, and is generally output after a series of processing is performed on a sensor output current, and when a voltage signal is required to be output, the conditioning circuit 100 further includes an amplifying circuit 104 and a voltage dividing circuit 105, where one end of the amplifying circuit 104 is connected to an output end of the current detecting circuit 103, the other end of the amplifying circuit 104 is connected to one end of the voltage dividing circuit 105, the other end of the voltage dividing circuit 105 is grounded, and after the amplifying circuit 104 amplifies the current, the amplifying circuit 105 outputs a corresponding voltage signal. In the embodiment of the present application, the amplifying circuit 104 may be a basic amplifying circuit, which has a very low input resistance, generally only a few ohms to a few dozens of ohms, but has a very high output resistance, and has the advantages of simple structure, convenience for integration, and the like, and the integrated circuit mostly adopts this coupling manner; the amplifier may also be an amplifier, which may be determined according to actual conditions, and the embodiment of the present application is not specifically limited herein. The voltage divider circuit 105 may be designed according to the voltage dividing principle, where the series voltage division means that in the series circuit, the currents on the resistors are equal, the sum of the voltages at the two ends of each resistor is equal to the total voltage of the circuit, and it is known that the voltage on each resistor is less than the total voltage of the circuit, so the series resistor divides the voltage.
In the embodiment of the present application, the amplifying circuit 104 and the voltage dividing circuit 105 obtain the voltage signal, so that the conditioning circuit 100 can adapt to various application scenarios, and the practicability of the conditioning circuit 100 is enhanced.
Fig. 6 is a schematic structural diagram of a conditioning circuit according to an embodiment of the present disclosure, and as shown in fig. 6, the conditioning circuit 100 includes a power interface 101, a PMOS transistor, a current detection circuit 103, an amplification circuit 104, and a voltage division circuit 105, where the power interface 101 is configured to be connected to a power source 120, a gate of the PMOS transistor is connected to the power interface 101, a source of the PMOS transistor is connected to a reference electrode of an electrochemical gas sensor, a drain of the PMOS transistor is connected to a working electrode of the electrochemical gas sensor, a first input end of the current detection circuit 103 is connected to a counter electrode, and a second input end is connected to the reference electrode, and the current detection circuit 103 is configured to measure a current magnitude of the electrochemical gas sensor during operation and obtain a corresponding current signal; one end of the amplifying circuit 104 is connected to the output end of the current detecting circuit 103, and the other end of the amplifying circuit 104 is connected to one end of the voltage dividing circuit 105; the conditioning circuit 100 further includes an output interface 106, and the other end of the voltage divider 105 may be connected to the output interface 106 for outputting a voltage signal, or the output interface 106 may also be connected to the other end of the amplifier circuit 104 for outputting a current signal.
When the electrochemical gas sensor does not work, the power interface 101 is disconnected from the power supply 120, so that the voltage of the grid g of the PMOS tube is 0, the voltage of the source s is the voltage of the reference electrode, the voltage of the grid g of the PMOS tube is smaller than the voltage of the source s, the voltage of the reference electrode is larger than the threshold voltage of the field effect tube, namely, the voltage difference between the voltage of the source s and the voltage of the grid g is larger than the threshold voltage, and the source s and the drain d are connected, so that charges accumulated when the electrochemical gas sensor works can be released, the power consumption of the electrochemical gas sensor is reduced, and the service life of the electrochemical gas sensor is prolonged; the switch module 102 is realized by a P-type field effect transistor, and one component realizes the function of the switch module 102, so that the switch module has the advantages of low cost, small volume and simple structure; the current generated by the electrochemical gas sensor is measured through the current detection circuit 103, so that the current can be obtained, and when the concentration of the gas to be measured needs to be calculated, the concentration can be calculated directly according to the current according to a calculation formula, so that the method is convenient and quick; the voltage signal is obtained through the amplifying circuit 104 and the voltage dividing circuit 105, so that the conditioning circuit 100 can adapt to various application scenes, and the practicability of the conditioning circuit 100 is enhanced.
On the basis of the above embodiment, preferably, the amplifying circuit 104 includes a current amplifier, and the voltage dividing circuit 105 is formed by sequentially connecting a plurality of resistors in series.
In one embodiment, the amplifying circuit 104 includes a current amplifier, which is typically an integrated chip and can be directly used. The voltage dividing circuit 105 is formed by connecting a plurality of resistors in series in sequence, one end of the voltage dividing circuit 105 is connected with the output end of the current amplifier, and the other end of the voltage dividing circuit 105 is grounded.
The embodiment of the present application further provides a chip, which includes the conditioning circuit 100 described above. The Chip (IC) may be, but is not limited to, an SOC (System on Chip) Chip or an SIP (System in package) Chip. The chip can solve the technical problem of short service life of the electrochemical gas sensor by a technical means of short-circuiting the reference electrode and the working electrode when the electrochemical gas sensor does not work.
The embodiment of the application also provides electronic equipment, which comprises an equipment main body and the chip arranged in the equipment theme. The electronic device may be, but is not limited to, a weight scale, a body fat scale, a nutrition scale, an infrared electronic thermometer, a pulse oximeter, a body composition analyzer, a mobile power supply, a wireless charger, a quick charger, a vehicle charger, an adapter, a display, a USB (Universal Serial Bus) docking station, a stylus pen, a true wireless headset, a screen in an automobile, an intelligent wearable device, a mobile terminal, and an intelligent home device. The intelligent wearable device comprises but is not limited to an intelligent watch, an intelligent bracelet and a cervical vertebra massager. Mobile terminals include, but are not limited to, smart phones, laptops, tablets, point of sale (POS) machines. The intelligent household equipment comprises but is not limited to an intelligent socket, an intelligent electric cooker, an intelligent sweeper and an intelligent lamp. The electronic equipment can solve the technical problem of short service life of the electrochemical gas sensor by a technical means of short-circuiting the reference electrode and the working electrode when the electrochemical gas sensor does not work.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present application, and they should be construed as being included in the present application.
Claims (10)
1. A conditioning circuit for connection to an external gas sensor, the gas sensor comprising a first electrode and a second electrode; the conditioning circuit includes:
the power interface is used for connecting a power supply to receive a power signal; and
the first end of the switch module is connected with the first electrode, the second end of the switch module is connected with the second electrode, the control end of the switch module is connected with the power interface, and the switch module is used for switching off the power supply according to the power signal when the power supply is powered on and switching on the power supply when the power supply is powered off.
2. The conditioning circuit of claim 1 further comprising a current sense circuit having a first input for connection to the first electrode and a second input for connection to the second electrode.
3. The conditioning circuit of claim 1 wherein the gas sensor comprises an electrochemical gas sensor, the first electrode being a reference electrode and the second electrode being a working electrode.
4. The conditioning circuit of any of claims 1 to 3 wherein the switching module comprises a P-type field effect transistor.
5. The conditioning circuit of any of claims 1 to 3 wherein the switching module comprises a PNP transistor.
6. The conditioning circuit according to any of claims 1 to 3 wherein the switch module comprises a controller, the first output of the controller is the first terminal of the switch module, the second output of the controller is the second terminal of the switch module, and the enable terminal of the controller is the control terminal of the switch module.
7. The conditioning circuit of claim 2, wherein the conditioning circuit further comprises an amplifying circuit and a voltage divider circuit;
one end of the amplifying circuit is connected with the output end of the current detection circuit, the other end of the amplifying circuit is connected with one end of the voltage division circuit, and the amplifying circuit is used for amplifying the current when the gas sensor works;
the voltage division circuit is used for obtaining a corresponding detection signal according to the amplified current.
8. The conditioning circuit of claim 7 wherein the amplifying circuit comprises a current amplifier and the voltage divider circuit comprises a plurality of resistors connected in series.
9. A chip comprising the conditioning circuit of any of claims 1 to 8.
10. An electronic device comprising a device body and the chip of claim 9 provided in the device body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221632879.8U CN217982160U (en) | 2022-06-28 | 2022-06-28 | Conditioning circuit, chip and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221632879.8U CN217982160U (en) | 2022-06-28 | 2022-06-28 | Conditioning circuit, chip and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217982160U true CN217982160U (en) | 2022-12-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221632879.8U Active CN217982160U (en) | 2022-06-28 | 2022-06-28 | Conditioning circuit, chip and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217982160U (en) |
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2022
- 2022-06-28 CN CN202221632879.8U patent/CN217982160U/en active Active
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