CN218273128U - Temperature and humidity detection circuit based on duty ratio, control circuit and electronic equipment - Google Patents

Temperature and humidity detection circuit based on duty ratio, control circuit and electronic equipment Download PDF

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Publication number
CN218273128U
CN218273128U CN202221637849.6U CN202221637849U CN218273128U CN 218273128 U CN218273128 U CN 218273128U CN 202221637849 U CN202221637849 U CN 202221637849U CN 218273128 U CN218273128 U CN 218273128U
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temperature
module
humidity
signal
resistor
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姚卫
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Guangzhou Shiyuan Electronics Thecnology Co Ltd
Guangzhou Shirui Electronics Co Ltd
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Guangzhou Shiyuan Electronics Thecnology Co Ltd
Guangzhou Shirui Electronics Co Ltd
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Abstract

The application relates to the field of temperature and humidity detection, and provides a temperature and humidity detection circuit based on duty ratio, a control circuit and an electronic device, which comprise a temperature and humidity signal detection module, an isolation module, an oscillation module and an output module; the output end of the temperature and humidity signal detection module is connected with the input end of the isolation module, and the temperature and humidity signal detection module is used for sending a temperature and humidity voltage signal to the isolation module; the output end of the isolation module is connected with the input end of the oscillation module; the isolation module is used for sending a first alternating current signal obtained by carrying out signal isolation processing on the temperature and humidity voltage signal to the oscillation module; the output end of the oscillation module is connected with the input end of the output module; the oscillation module is used for sending a second alternating current signal after the oscillation processing is carried out on the first alternating current signal to the output module; the output module is used for carrying out reverse processing on the second alternating current signal and outputting a duty ratio detection signal for indicating and adjusting the temperature and humidity signals, so that the complexity of the circuit is simplified, and the sensitivity and the stability are enhanced.

Description

Temperature and humidity detection circuit based on duty ratio, control circuit and electronic equipment
Technical Field
The utility model relates to a temperature and humidity measurement field, in particular to are temperature and humidity measurement circuit, temperature and humidity control circuit and electronic equipment based on duty cycle.
Background
With the development of science and technology and the improvement of the quality of life of people, people pursue equipment with higher reliability and more intelligence, and under the premise, the product with strong reliability and high sensitivity is urgently needed to ensure the reliability in industry and life. However, the conventional temperature detection circuit structure is susceptible to power supply voltage, and has low stability and reliability.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems in the related art, the application provides a temperature and humidity detection circuit based on duty ratio, which simplifies the complexity of the temperature and humidity detection circuit, enhances the sensitivity and stability of the temperature and humidity detection circuit, and effectively improves the working efficiency.
According to a first aspect of an embodiment of the present application, a temperature and humidity detection circuit based on a duty ratio is provided, which includes a temperature and humidity signal detection module, an isolation module, an oscillation module, and an output module;
the output end of the temperature and humidity signal detection module is connected with the input end of the isolation module, and the temperature and humidity signal detection module is used for sending temperature and humidity voltage signals to the isolation module;
the output end of the isolation module is connected with the input end of the oscillation module; the isolation module is used for sending a first alternating current signal obtained by carrying out signal isolation processing on the temperature and humidity voltage signal to the oscillation module;
the output end of the oscillation module is connected with the input end of the output module; the oscillation module is used for sending a second alternating current signal obtained by oscillating the first alternating current signal to the output module;
the output module is used for carrying out reverse processing on the second alternating current signal and outputting a duty ratio detection signal for indicating and adjusting the temperature and humidity signal.
According to a second aspect of the embodiments of the present application, there is provided a temperature and humidity control circuit based on a duty ratio, including: the temperature and humidity control circuit comprises a temperature and humidity detection circuit based on duty ratio, a microprocessor and a temperature and humidity regulation circuit;
the temperature and humidity detection circuit based on the duty ratio comprises a temperature and humidity signal detection module, an isolation module, an oscillation module and an output module;
the output end of the temperature and humidity signal detection module is connected with the input end of the isolation module, and the temperature and humidity signal detection module is used for sending temperature and humidity voltage signals to the isolation module;
the output end of the isolation module is connected with the input end of the oscillation module; the isolation module is used for sending a first alternating current signal obtained by carrying out signal isolation processing on the temperature and humidity voltage signal to the oscillation module;
the output end of the oscillation module is connected with the input end of the output module; the oscillation module is used for sending a second alternating current signal obtained by oscillating the first alternating current signal to the output module;
the output module is used for carrying out reverse processing on the second alternating current signal and outputting a duty ratio detection signal used for indicating and adjusting the temperature and humidity signal.
The input end of the microprocessor is connected with the output end of the output module, and the microprocessor is used for analyzing the duty ratio detection signal, generating a control signal and sending the control signal to the temperature and humidity adjusting circuit.
According to a third aspect of an embodiment of the present application, there is provided an electronic device, including a temperature and humidity control circuit based on a duty ratio; the temperature and humidity control circuit based on the duty ratio comprises a temperature and humidity detection circuit based on the duty ratio, a microprocessor and a temperature and humidity adjusting circuit; the temperature and humidity detection circuit based on the duty ratio comprises a temperature and humidity signal detection module, an isolation module, an oscillation module and an output module;
the output end of the temperature and humidity signal detection module is connected with the input end of the isolation module, and the temperature and humidity signal detection module is used for sending temperature and humidity voltage signals to the isolation module;
the output end of the isolation module is connected with the input end of the oscillation module; the isolation module is used for sending a first alternating current signal obtained by carrying out signal isolation processing on the temperature and humidity voltage signal to the oscillation module;
the output end of the oscillation module is connected with the input end of the output module; the oscillation module is used for sending a second alternating current signal obtained by oscillating the first alternating current signal to the output module;
the output module is used for carrying out reverse processing on the second alternating current signal and outputting a duty ratio detection signal for indicating and adjusting the temperature and humidity signal.
In the embodiment of the application, temperature and humidity voltage signals are collected through the temperature and humidity signal detection module, filtering and isolation of the signals are realized through the isolation module, oscillation processing of the signals is realized through the oscillation module, reverse processing of the signals is realized through the output module, duty ratio detection signals used for indicating and adjusting the temperature and humidity signals are output, complexity of a temperature and humidity detection circuit based on duty ratio is simplified, sensitivity and stability of the detection circuit are enhanced, and working efficiency is effectively improved.
For a better understanding and practice, the invention is described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of a temperature and humidity detection circuit based on duty ratio according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a temperature and humidity signal detection module of a temperature and humidity detection circuit based on a duty ratio according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an isolation module of a temperature and humidity detection circuit based on a duty cycle according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an oscillation module of a temperature and humidity detection circuit based on a duty ratio according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an output module of a temperature and humidity detection circuit based on a duty cycle according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a temperature and humidity control circuit based on a duty cycle according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if as used herein may be interpreted as" at "8230; \8230when" or "when 8230; \823030, when" or "in response to a determination", depending on the context.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a temperature and humidity detection circuit based on duty ratio according to an embodiment of the present disclosure; the temperature and humidity detection circuit based on the duty ratio comprises a temperature and humidity signal detection module 1, an isolation module 2, an oscillation module 3 and an output module 4.
The output end 101 of the temperature and humidity signal detection module is connected with the input end 201 of the isolation module, and the temperature and humidity signal detection module 1 is used for sending temperature and humidity voltage signals to the isolation module 2.
The output end 202 of the isolation module is connected with the input end 301 of the oscillation module; the isolation module 2 is used for transmitting the first alternating current signal subjected to signal isolation processing on the temperature and humidity voltage signal to the oscillation module 3.
The output end 302 of the oscillation module is connected with the input end 401 of the output module; the oscillation module 3 is configured to send a second ac signal obtained by oscillating the first ac signal to the output module 4.
The output module 4 is used for performing reverse processing on the second alternating current signal and outputting a duty ratio detection signal for indicating and adjusting the temperature and humidity signal.
When the temperature or the humidity around the temperature and humidity signal detection module 1 changes, the temperature and humidity signal detection module 1 generates a temperature and humidity voltage signal, the output end 101 of the temperature and humidity signal detection module sends the temperature and humidity voltage signal to the input end 201 of the isolation module 2, and the isolation module 2 performs signal isolation processing on the temperature and humidity voltage signal, so that signal filtering and isolation are realized, and the temperature and humidity voltage signal after signal isolation processing is obtained and serves as a first alternating current signal. The isolation module 2 sends the first alternating current signal to the input end 301 of the oscillation module through the output end 202 of the isolation module, and the oscillation module 3 performs oscillation processing on the received first alternating current signal, so that square waves in the first alternating current signal are extracted, and a second alternating current signal is obtained. The oscillation module 3 sends a second alternating current signal to the input end 401 of the output module through the output end 302, and the output module 4 performs reverse processing on the received second alternating current signal to obtain a duty ratio detection signal for indicating and adjusting a temperature and humidity signal, so that temperature or humidity detection is realized. The complexity of the temperature and humidity detection circuit based on the duty ratio is simplified, the sensitivity and the stability of the detection circuit are enhanced, and the working efficiency is effectively improved.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a temperature and humidity signal detection module of a temperature and humidity detection circuit based on a duty cycle according to an embodiment of the present application.
In an embodiment, the temperature and humidity signal detection module 1 includes a temperature and humidity signal acquisition circuit 11 and a first resistor 12; the first end of the temperature and humidity signal acquisition circuit is connected with the power supply through a first resistor 12, and is also connected with the input end 201 of the isolation module; the second end of the temperature and humidity signal acquisition circuit is connected with the ground. When the temperature or humidity around the temperature and humidity signal detection module 1 changes, the temperature and humidity signal acquisition circuit 11 acquires temperature and humidity voltage signals,
in an embodiment, the temperature and humidity signal collecting circuit 11 includes a temperature and humidity sensitive resistor 13, a second resistor 14, and a third resistor 15; a first end of the temperature and humidity sensitive resistor 13 connected with the second resistor 14 in series is connected with the first resistor 12 and the input end 201 of the isolation module, and a second end of the temperature and humidity sensitive resistor 13 connected with the second resistor 14 in series is grounded; two ends of the third resistor 15 are respectively connected with the first end and the second end of the temperature and humidity sensitive resistor 13 and the second resistor 14 which are connected in series.
When the ambient temperature or humidity changes, the resistance of the temperature/humidity sensitive resistor 13 changes, and the temperature/humidity signal detection module 1 generates a temperature/humidity voltage signal U O Specifically, U O The values of (A) are:
U O ＝{(R X +R 1 )R 3 /(R X +R 1 +R 3 )/[(R X +R 1 )R 3 /(R X +R 1 +R 3 )+R 2 }*VCC
in the formula, R X Is the corresponding resistance value R of the temperature and humidity sensitive resistor 13 1 Is the corresponding resistance value, R, of the first resistor 12 2 Is the corresponding resistance value, R, of the second resistor 14 3 The resistance value of the third resistor 15 is shown, and VCC is the voltage of the power supply.
The two ends of the third resistor 15 are connected with the first end and the second end of the temperature and humidity sensitive resistor 13 and the second resistor 14 which are connected in series respectively, and the temperature and humidity sensitive resistor 13 and the third resistor 15 are connected in parallel to prevent the resistance value of the temperature and humidity sensitive resistor 13 from being too large, so that the voltage amplitude of the voltage signal output by the temperature and humidity signal detection module 1 approaches to the power supply voltage, the oscillation module 3 at the rear stage cannot start oscillation, and the working stability is improved.
In an embodiment, the temperature and humidity signal detecting module 1 further includes a first diode 16 and a second diode 17; the cathode of the first diode 16 is connected to the power supply, the anode of the first diode 16 is connected to the cathode of the second diode 17 and the second resistor 14, respectively, the cathode of the second diode 17 is connected to the second resistor 14, and the anode of the second diode 17 is connected to the ground.
The first diode 16 and the second diode 17 play a role in current backflow, and specifically, when the resistance values of the temperature and humidity sensitive resistor 13 change, the first diode 16 and the second diode 17 are turned on when the voltage of the collection point corresponding to the first diode 16 and the second diode 17 is higher than the power supply voltage or lower than the ground voltage.
In an embodiment, the temperature and humidity signal detection module 1 further includes a first capacitor 18, and two ends of the first capacitor 18 are respectively connected to the first end and the second end of the temperature and humidity signal acquisition circuit. The second resistor 14 and the first capacitor 18 constitute a low-pass filter for suppressing high-frequency noise in the voltage signal.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an isolation module 2 of a temperature and humidity detection circuit based on a duty cycle according to an embodiment of the present application.
In one embodiment, the isolation module 2 comprises a first operational amplifier 21; the positive input end of the first operational amplifier is connected with the output end 101 of the temperature and humidity signal detection module, the negative input end of the first operational amplifier is connected with the output end of the first operational amplifier 21, and the output end of the first operational amplifier 21 is connected with the input end 301 of the oscillation module.
The first operational amplifier 21 adopts an LM358AQ operational amplifier, and because of the characteristics of the LM358AQ operational amplifier, the resistances at the positive and negative ends are infinite, which is equivalent to an open circuit, so that the impedance variable of the later stage is not introduced into the former stage, and a good isolation effect is achieved. In an optional embodiment, the two filter capacitors 212 are respectively incorporated into the positive power input stage 211 of the first operational amplifier and grounded, so that power supply ripples can be well filtered, and the stable operation of the first operational amplifier 21 is ensured.
The first operational amplifier 21 obtains the temperature and humidity voltage signal sent by the temperature and humidity signal detection module 1 through the positive input end, and performs signal isolation processing on the temperature and humidity voltage signal to generate a first alternating current signal, and the first alternating current signal is sent to the oscillation module 3 through the output end of the first operational amplifier 21.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an oscillation module 3 of a temperature and humidity detection circuit based on a duty cycle according to an embodiment of the present disclosure.
In one embodiment, the oscillation module 3 includes a second operational amplifier 31, a fourth resistor 32, a fifth resistor 33, a second capacitor 34, and a sixth resistor 35.
The positive input terminal of the second operational amplifier is connected to the output terminal 202 of the isolation module via the fourth resistor 32; the output end of the second operational amplifier is connected with the negative input end of the second operational amplifier through a fifth resistor 33; the negative input of the second operational amplifier is connected to ground via a second capacitor 34; the output end of the second operational amplifier is connected with the input end 401 of the output module; one end of the sixth resistor 35 is connected to the fourth resistor 32, and the other end of the sixth resistor 35 is connected to the input end 401 of the output module.
The second operational amplifier 31 adopts an LM358AQ operational amplifier, and forms an RC oscillation circuit through a peripheral circuit constructed by the second operational amplifier 31, the fourth resistor 32, the fifth resistor 33, the second capacitor 34 and the sixth resistor 35, and oscillates the first alternating current signal to generate a second alternating current signal, which is a voltage signal including a square wave and a sawtooth wave; specifically, a positive feedback manner is adopted, a part of the voltage signal output by the second operational amplifier 31 is positively fed back to the input end to form oscillation, and since the charging and discharging of the two ends of the second capacitor 34 are connected with the negative input end of the second operational amplifier, that is, a voltage comparator is formed with the positive input end of the second operational amplifier, since the voltage of the two ends of the second capacitor 34 is small, the charging rate is much greater than the discharging rate, a square wave with a certain duty ratio can be generated, so that a second alternating current signal is generated, and is sent to the output module 4 through the output end of the second operational amplifier.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an output module 4 of a temperature and humidity detection circuit based on a duty cycle according to an embodiment of the present disclosure.
In one embodiment, the output module 4 includes a transistor 41, a seventh resistor 42, a third capacitor 43, and an eighth resistor 44.
The base of the triode 41 is connected with the output end 302 of the oscillation module, the collector of the triode 41 is connected with the power supply through the seventh resistor 42, and the emitter of the triode 41 is connected with the ground; one end of third capacitor 43 is connected to the emitter of transistor 41; the other end of the third capacitor 43 is connected to the collector of the transistor 41 via an eighth resistor 44.
Through a triode 41 and a peripheral circuit formed by a seventh resistor 42, a third capacitor 43 and an eighth resistor 44, the second alternating current signal is subjected to reverse processing, and a duty ratio detection signal for indicating a temperature and humidity regulation signal is generated, specifically:
by connecting the base of the triode 41 with the oscillation module 3, the output of the oscillation module 3 is judged to be low level or high level according to the square wave with a certain duty ratio in the second alternating current signal. Specifically, when the oscillation module 3 outputs a low level, the transistor 41 is not turned on, and the anode of the third capacitor 43 is at a high level; the positive electrode of the third capacitor 43 is connected to the eighth resistor 44. When the oscillation module 3 outputs a high level, the transistor 41 is turned on, the anode of the third capacitor 43 is at a low level, and due to the charging and discharging characteristics of the third capacitor 43, the time for the anode of the third capacitor 43 to display the level is accumulated, so that a square wave with a duty ratio larger than that of the square wave in the second alternating current signal is generated as a duty ratio detection signal, and the eighth resistor 44 is connected in series with the third capacitor 43, so that the power supply ripple and the high-level noise are suppressed, and the duty ratio detection signal can be generated more accurately.
In one embodiment, the output module 4 further includes a ninth resistor 45 and a tenth resistor 46; one end of the ninth resistor 45 is connected to the output end 302 of the oscillation module; the other end of the ninth resistor 45 is connected with the base of the triode 41 respectively; one end of the tenth resistor 46 is connected to the base of the transistor 41, and the other end of the tenth resistor 46 is connected to ground.
In order to prevent transistor 41 from burning out due to excessive current when transistor 41 is turned on, a ninth resistor 45 is connected in series with the base of transistor 41 to limit the current that transistor 41 is turned on, thereby protecting transistor 41.
By providing the tenth resistor 46 as the pull-down resistor of the output module 4 and providing the ninth resistor 45 and the tenth resistor 46 to form a voltage dividing circuit, the level state is low when the anode of the third capacitor 43 is initially set, thereby preventing an erroneous operation and improving the stability of the output module 4.
The working process of the temperature and humidity detection circuit based on the duty ratio is specifically described as follows:
when the humidity in the air is very high, the resistance value of the temperature and humidity sensitive resistor 13 is relatively small, the divided voltage is reduced, the temperature and humidity signal detection module 1 generates a temperature and humidity voltage signal according to the change of the voltage of the temperature and humidity sensitive resistor 13, sends the temperature and humidity voltage signal to the isolation module 2, generates a first alternating current signal after isolation processing, sends the first alternating current signal to the oscillation module 3, generates a second alternating current signal after oscillation processing, sends the second alternating current signal to the output module 4, and accumulates the time for displaying a low level by the anode of the third capacitor 43 according to the charge and discharge characteristics of the third capacitor 43 after reverse processing, so that a duty ratio detection signal for indicating and adjusting the temperature and humidity signal is generated, a waveform with a larger duty ratio can be obtained at the anode of the third capacitor 43, and then detection data of the temperature and humidity signal can be obtained by obtaining the accumulation time of the level in the duty ratio detection signal.
When the humidity in the air is very low, the resistance value of the temperature and humidity sensitive resistor 13 is relatively very high, the divided voltage is increased, the temperature and humidity signal detection module 1 generates a temperature and humidity voltage signal according to the change of the voltage of the temperature and humidity sensitive resistor 13, sends the temperature and humidity voltage signal to the isolation module 2, generates a first alternating current signal after isolation processing, sends the first alternating current signal to the oscillation module 3, generates a second alternating current signal after oscillation processing, sends the second alternating current signal to the output module 4, and accumulates the time when the anode of the third capacitor 43 displays a high level according to the charge-discharge characteristic of the third capacitor 43, namely the charge rate is much higher than the discharge rate, so as to generate a duty ratio detection signal for indicating and adjusting the temperature and humidity signal; therefore, a waveform with a small duty ratio can be obtained at the positive electrode of the third capacitor 43, and further, the detection data of the temperature and humidity signal can be obtained by obtaining the accumulation time of the level in the duty ratio detection signal.
The microprocessor can generate corresponding control signals according to the detection data of the temperature and humidity signals, and the control signals are sent to the temperature and humidity adjusting circuit to carry out temperature and humidity adjusting work.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a temperature and humidity control circuit based on a duty cycle according to an embodiment of the present application.
The embodiment of the application also provides a temperature and humidity control circuit based on duty cycle, include: a temperature and humidity detection circuit 5 based on duty ratio, a microprocessor 6 and a temperature and humidity adjusting circuit 7.
The temperature and humidity detection circuit 5 based on the duty ratio comprises a temperature and humidity signal detection module 1, an isolation module 2, an oscillation module 3 and an output module 4.
The output end 101 of the temperature and humidity signal detection module is connected with the input end 201 of the isolation module, and the temperature and humidity signal detection module 1 is used for sending temperature and humidity voltage signals to the isolation module 2.
The output end 202 of the isolation module is connected with the input end 301 of the oscillation module; the isolation module 2 is used for transmitting the first alternating current signal subjected to signal isolation processing on the temperature and humidity voltage signal to the oscillation module 3.
The output end 302 of the oscillation module is connected with the input end 401 of the output module; the oscillation module 3 is configured to send the second ac signal obtained by oscillating the first ac signal to the output module 4.
The output module 4 is used for performing reverse processing on the second alternating current signal and outputting a duty ratio detection signal for indicating and adjusting the temperature and humidity signal.
The input end 601 of the microprocessor is connected with the output end 402 of the output module, and the microprocessor 6 is used for analyzing the duty ratio detection signal, generating a control signal and sending the control signal to the temperature and humidity adjusting circuit 7.
The microprocessor 6 is a central processing unit composed of one or a few large-scale integrated circuits, the chip model of the microprocessor 6 includes but is not limited to STM32\ GD32\ STC51 series \ MM32 series, the microprocessor 6 analyzes the duty ratio detection signal output by the output module 4, generates a control signal and sends the control signal to the temperature and humidity adjusting circuit 7, specifically, the microprocessor 6 acquires the high-level accumulated time in the duty ratio detection signal as duty ratio detection data, generates a corresponding control signal according to the duty ratio detection data, and sends the control signal to the temperature and humidity adjusting circuit 7. In an optional embodiment, the temperature and humidity adjusting circuit 7 may include a relay and an amplifying circuit, and the relay and the amplifying circuit in the temperature and humidity adjusting circuit 7 are controlled to control the motor, the heating wire, and other functional components, so as to adjust the temperature and humidity.
The circuit structures of the temperature and humidity signal detection module 1, the isolation module 2, the oscillation module 3 and the output module 4 are completely the same as those described above, and are not described herein again.
Referring to fig. 7, fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
The embodiment of the application also provides electronic equipment, which comprises a temperature and humidity control circuit based on the duty ratio; the temperature and humidity control circuit based on the duty ratio comprises a temperature and humidity detection circuit 5 based on the duty ratio, a microprocessor 6 and a temperature and humidity adjusting circuit 7; the temperature and humidity detection circuit 5 based on the duty ratio comprises a temperature and humidity signal detection module 1, an isolation module 2, an oscillation module 3 and an output module 4.
The output end 101 of the temperature and humidity signal detection module is connected with the input end 201 of the isolation module, and the temperature and humidity signal detection module 1 is used for sending temperature and humidity voltage signals to the isolation module 2.
The output end 202 of the isolation module is connected with the input end 301 of the oscillation module; the isolation module 2 is used for transmitting the first alternating current signal subjected to signal isolation processing on the temperature and humidity voltage signal to the oscillation module 3.
The output end 302 of the oscillation module is connected with the input end 401 of the output module; the oscillation module 3 is configured to send a second ac signal obtained by oscillating the first ac signal to the output module 4.
The output module 4 is configured to perform reverse processing on the second ac signal, and output a duty ratio detection signal for indicating adjustment of the temperature and humidity signal.
The input end 601 of the microprocessor is connected with the output end 402 of the output module, and the microprocessor 6 is used for analyzing the duty ratio detection signal, generating a control signal and sending the control signal to the temperature and humidity adjusting circuit 7.
The circuit structures of the temperature and humidity signal detection module 1, the isolation module 2, the oscillation module 3, the output module 4, the microprocessor 6 and the temperature and humidity adjustment circuit 7 are completely the same as those described above, and are not described herein again.
The present invention is not limited to the above embodiment, and if various modifications or variations of the present invention are not departed from the spirit and scope of the present invention, provided they fall within the scope of the claims and the equivalent technical scope of the present invention, then the present invention is also intended to include such modifications and variations.

Claims (11)

1. The utility model provides a temperature and humidity detection circuit based on duty cycle which characterized in that: the temperature and humidity signal detection module comprises a temperature and humidity signal detection module, an isolation module, an oscillation module and an output module;
the output end of the temperature and humidity signal detection module is connected with the input end of the isolation module, and the temperature and humidity signal detection module is used for sending temperature and humidity voltage signals to the isolation module;
the output end of the isolation module is connected with the input end of the oscillation module; the isolation module is used for sending a first alternating current signal obtained by carrying out signal isolation processing on the temperature and humidity voltage signal to the oscillation module;
the output end of the oscillation module is connected with the input end of the output module; the oscillation module is used for sending a second alternating current signal obtained by oscillating the first alternating current signal to the output module;
the output module is used for carrying out reverse processing on the second alternating current signal and outputting a duty ratio detection signal for indicating and adjusting the temperature and humidity signal.
2. The duty cycle based temperature and humidity sensing circuit of claim 1, wherein:
the temperature and humidity signal detection module comprises a temperature and humidity signal acquisition circuit and a first resistor;
the first end of the temperature and humidity signal acquisition circuit is connected with a power supply through the first resistor, and is also connected with the input end of the isolation module; and the second end of the temperature and humidity signal acquisition circuit is connected with the ground.
3. The duty cycle based temperature and humidity sensing circuit of claim 2, wherein:
the temperature and humidity signal acquisition circuit comprises a temperature and humidity sensitive resistor, a second resistor and a third resistor;
a first end of the temperature and humidity sensitive resistor connected with the second resistor in series is connected with the first resistor and the input end of the isolation module, and a second end of the temperature and humidity sensitive resistor connected with the second resistor in series is grounded; and two ends of the third resistor are respectively connected with the first end and the second end of the temperature and humidity sensitive resistor which is connected with the second resistor in series.
4. The duty cycle based temperature and humidity sensing circuit of claim 3, wherein:
the temperature and humidity signal detection module further comprises a first diode and a second diode;
the cathode of the first diode is connected with the power supply, the anode of the first diode is respectively connected with the cathode of the second diode and the second resistor, the cathode of the second diode is connected with the second resistor, and the anode of the second diode is connected with the ground.
5. The duty cycle based temperature and humidity sensing circuit of claim 3, wherein:
the temperature and humidity signal detection module further comprises a first capacitor, and two ends of the first capacitor are connected with the first end and the second end of the temperature and humidity signal acquisition circuit respectively.
6. The duty cycle based temperature and humidity sensing circuit of claim 1, wherein:
the isolation module comprises a first operational amplifier;
the positive input end of the first operational amplifier is connected with the output end of the temperature and humidity signal detection module, the negative input end of the first operational amplifier is connected with the output end of the first operational amplifier, and the output end of the first operational amplifier is connected with the input end of the oscillation module.
7. The duty cycle based temperature and humidity sensing circuit of claim 1, wherein:
the oscillation module comprises a second operational amplifier, a fourth resistor, a fifth resistor, a second capacitor and a sixth resistor;
the positive input end of the second operational amplifier is connected with the output end of the isolation module through the fourth resistor; the output end of the second operational amplifier is connected with the negative input end of the second operational amplifier through the fifth resistor; the negative input end of the second operational amplifier is connected with the ground through the second capacitor; the output end of the second operational amplifier is connected with the input end of the output module; one end of the sixth resistor is connected with the fourth resistor, and the other end of the sixth resistor is connected with the input end of the output module.
8. The duty cycle based temperature and humidity sensing circuit of claim 1, wherein:
the output module comprises a triode, a seventh resistor, a third capacitor and an eighth resistor;
the base electrode of the triode is connected with the output end of the oscillation module, the collector electrode of the triode is connected with a power supply through the seventh resistor, and the emitting electrode of the triode is connected with the ground;
one end of the third capacitor is connected with the emitting electrode of the triode; the other end of the third capacitor is connected with the collector of the triode through the eighth resistor.
9. The duty cycle based temperature and humidity sensing circuit of claim 8, wherein:
the output module further comprises a ninth resistor and a tenth resistor; one end of the ninth resistor is connected with the output end of the oscillation module; the other end of the ninth resistor is connected with the base electrode of the triode respectively; one end of the tenth resistor is connected with the base electrode of the triode, and the other end of the tenth resistor is connected with the ground.
10. A temperature and humidity control circuit based on duty ratio is characterized by comprising: the temperature and humidity detection circuit based on the duty ratio, the microprocessor and the temperature and humidity adjusting circuit;
the temperature and humidity detection circuit based on the duty ratio comprises a temperature and humidity signal detection module, an isolation module, an oscillation module and an output module;
the output end of the temperature and humidity signal detection module is connected with the input end of the isolation module, and the temperature and humidity signal detection module is used for sending temperature and humidity voltage signals to the isolation module;
the output end of the isolation module is connected with the input end of the oscillation module; the isolation module is used for sending a first alternating current signal obtained by carrying out signal isolation processing on the temperature and humidity voltage signal to the oscillation module;
the output end of the oscillation module is connected with the input end of the output module; the oscillation module is used for sending a second alternating current signal obtained by oscillating the first alternating current signal to the output module;
the output module is used for carrying out reverse processing on the second alternating current signal and outputting a duty ratio detection signal for indicating and adjusting a temperature and humidity signal;
the input end of the microprocessor is connected with the output end of the output module, and the microprocessor is used for analyzing the duty ratio detection signal, generating a control signal and sending the control signal to the temperature and humidity adjusting circuit.
11. An electronic device, comprising a temperature and humidity control circuit based on a duty cycle; the temperature and humidity control circuit based on the duty ratio comprises a temperature and humidity detection circuit based on the duty ratio, a microprocessor and a temperature and humidity adjusting circuit; the temperature and humidity detection circuit based on the duty ratio comprises a temperature and humidity signal detection module, an isolation module, an oscillation module and an output module;
the output end of the temperature and humidity signal detection module is connected with the input end of the isolation module, and the temperature and humidity signal detection module is used for sending temperature and humidity voltage signals to the isolation module;
the output end of the isolation module is connected with the input end of the oscillation module; the isolation module is used for sending a first alternating current signal obtained by carrying out signal isolation processing on the temperature and humidity voltage signal to the oscillation module;
the output end of the oscillation module is connected with the input end of the output module; the oscillation module is used for sending a second alternating current signal obtained by oscillating the first alternating current signal to the output module;
the output module is used for carrying out reverse processing on the second alternating current signal and outputting a duty ratio detection signal used for indicating and adjusting the temperature and humidity signal.
CN202221637849.6U 2022-06-28 2022-06-28 Temperature and humidity detection circuit based on duty ratio, control circuit and electronic equipment Active CN218273128U (en)

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CN202221637849.6U CN218273128U (en) 2022-06-28 2022-06-28 Temperature and humidity detection circuit based on duty ratio, control circuit and electronic equipment

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Application Number Priority Date Filing Date Title
CN202221637849.6U CN218273128U (en) 2022-06-28 2022-06-28 Temperature and humidity detection circuit based on duty ratio, control circuit and electronic equipment

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CN218273128U true CN218273128U (en) 2023-01-10

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