Temperature, humidity and pressure detection circuit and device

Abstract

The utility model discloses a temperature, humidity and pressure detection circuit and device, and relates to the technical field of sensors. The temperature, humidity and pressure detection circuit comprises a controller, a pressure detection sensor, a temperature and humidity detection sensor and a power supply control switch. The pulse signal output end of the controller is electrically connected with the control end of the power supply control switch; the input end of the power supply control switch is electrically connected with an external power supply end, and the output end of the power supply control switch is electrically connected with a power supply signal end of the pressure detection sensor; the pressure signal output end of the pressure detection sensor is electrically connected with the pressure signal input end of the controller; the humiture signal output end of the humiture detection sensor is electrically connected with the humiture signal input end of the controller. According to the technical scheme, intermittent power supply to the pressure detection sensor is achieved through the pulse signals output by the controller, interference of heating of the temperature, humidity and pressure detection circuit on relative humidity detection is effectively reduced, and therefore the accuracy and stability of relative humidity measurement are improved.

Description

TECHNICAL FIELD

[0001] The utility model embodiment relates to sensor technical field, especially, it relates to a temperature and humidity pressure detection circuit, device. BACKGROUND

[0002] At present, environmental temperature and humidity pressure sensor is widely used in meteorological detection, industrial control, medical equipment and other fields, usually adopts temperature and humidity sensing unit and pressure sensing unit to work cooperatively to measure temperature, humidity and air pressure and other parameters of environment. Among them, the measurement of relative humidity not only depends on the absolute content of water molecules in the air, but also needs to combine temperature information to calculate to obtain accurate humidity value.

[0003] When the pressure sensing unit in the environmental temperature and humidity pressure sensor works, its heat will cause the temperature of the temperature and humidity sensing unit to rise, thereby affecting the calculation accuracy of the temperature and humidity sensing unit on the relative humidity. Therefore, at present, it is urgent to solve the technical problem that there is error in the measurement value of relative humidity when the environmental temperature and humidity pressure sensor measures. UTILITY MODEL CONTENT

[0004] The utility model provides a temperature and humidity pressure detection circuit, device to realize the intermittent power supply of pressure detection sensor, thereby improve the accuracy and stability of relative humidity measurement.

[0005] The utility model discloses a temperature and humidity pressure detection circuit in the first aspect, temperature and humidity pressure detection circuit includes: controller, pressure detection sensor, temperature and humidity detection sensor and power supply control switch;

[0006] The pulse signal output end of the controller is electrically connected with the control end of the power supply control switch;

[0007] The input end of the power supply control switch is electrically connected with the external power source end, and the output end of the power supply control switch is electrically connected with the power signal end of the pressure detection sensor;

[0008] The pressure signal output end of the pressure detection sensor is electrically connected with the pressure signal input end of the controller;

[0009] The temperature and humidity signal output end of the temperature and humidity detection sensor is electrically connected with the temperature and humidity signal input end of the controller.

[0010] Optionally, the power supply control switch includes a switch transistor;

[0011] The gate of the switch transistor is electrically connected with the pulse signal output end of the controller; The first pole of the switch transistor is electrically connected with the external power source end, and the second pole of the switch transistor is electrically connected with the power signal end of the pressure detection sensor.

[0012] Optionally, the power supply control switch further comprises a gate resistor.

[0013] A first end of the gate resistor is electrically connected to the external power supply end, and a second end of the gate resistor is electrically connected to the gate of the switch transistor.

[0014] Optionally, the pressure detection sensor comprises a pressure detection chip and a filter capacitor.

[0015] A power supply signal end of the pressure detection chip is electrically connected to the output end of the power supply control switch, a ground end of the pressure detection chip is grounded, and a pressure signal output end of the pressure detection chip is electrically connected to a pressure signal input end of the controller.

[0016] A first end of the filter capacitor is electrically connected to the pressure signal output end of the pressure detection chip, and a second end of the filter capacitor is grounded.

[0017] Optionally, the temperature and humidity detection sensor comprises a temperature and humidity detection chip.

[0018] A power supply input end of the temperature and humidity detection chip is electrically connected to the external power supply end, a ground end of the temperature and humidity detection chip is grounded, and a temperature and humidity signal output end of the temperature and humidity detection chip is electrically connected to a temperature and humidity signal input end of the controller.

[0019] Optionally, a clock signal input end of the temperature and humidity detection chip is electrically connected to a clock signal output end of the controller.

[0020] The utility model discloses a second aspect provides a kind of temperature and humidity pressure detection device, temperature and humidity pressure detection device includes: shell, be set in the printed circuit board of shell and the temperature and humidity pressure detection circuit as described above;

[0021] The temperature and humidity pressure detection circuit is arranged on the first side surface of the printed circuit board.

[0022] The temperature and humidity pressure detection circuit is electrically connected with the external power supply end by the printed circuit board.

[0023] Optionally, the controller, the pressure detection sensor and the temperature and humidity detection sensor are sequentially arranged on the printed circuit board along a first direction.

[0024] Optionally, the temperature and humidity pressure detection device further comprises a sampling window placed on the shell.

[0025] In the direction perpendicular to the first side surface of the printed circuit board, the sampling window overlaps the temperature and humidity detection sensor.

[0026] Optionally, the printed circuit board is provided with a hollow structure.

[0027] The hollow structure is located at least between the pressure detection sensor and the temperature and humidity detection sensor.

[0028] The technical scheme of the utility model discloses a controller, pressure detection sensor, temperature and humidity detection sensor and power supply control switch are arranged in the temperature and humidity pressure detection circuit, the pressure signal output end of pressure detection sensor is electrically connected with the pressure signal input end of controller, so that pressure detection sensor can output the environmental pressure signal measured to the controller, the temperature and humidity signal output end of temperature and humidity detection sensor is electrically connected with the temperature and humidity signal input end of controller, so that temperature and humidity detection sensor can output the environmental temperature signal and environmental relative humidity signal measured to the controller, so that the controller can acquire the temperature, relative humidity and pressure parameters of environment in real time, and can carry out data processing and storage to the temperature, relative humidity and pressure parameters of environment acquired in real time. In addition, the pulse signal output end of controller is electrically connected with the control end of power supply control switch, the input end of power supply control switch is electrically connected with external power supply end, and the output end of power supply control switch is electrically connected with the power signal end of pressure detection sensor, so that the on-off of power supply control switch can be periodically controlled by the pulse signal outputted by controller, and the intermittent power supply of pressure detection sensor can be realized by adjusting the on-off of power supply control switch, which significantly reduces the power consumption and heat accumulation of pressure detection sensor, and further reduces the influence of power consumption and heat accumulation of pressure detection sensor on the environmental relative humidity detection of temperature and humidity detection sensor, thereby improving the accuracy and stability of environmental relative humidity measurement.

[0029] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the utility model, nor is it used to limit the scope of the utility model. Other features of the utility model will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed in the embodiment description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0031] Figure 1 The structural diagram of a temperature and humidity pressure detection circuit provided by the utility model embodiment is shown in the figure.

[0032] Figure 2 The circuit connection diagram of a temperature and humidity pressure detection circuit provided by the utility model embodiment is shown in the figure.

[0033] Figure 3A structure schematic view of a temperature and humidity pressure detection device provided by the utility model;

[0034] Figure 4 A structure schematic view of another temperature and humidity pressure detection device provided by the utility model.

[0035] In the drawing: 1. Controller; 2. Pressure detection sensor; 3. Temperature and humidity detection sensor; 4. Power supply control switch; 5. External power supply end; 101. Pulse signal output end of the controller; 102. Pressure signal input end of the controller; 103. Temperature and humidity signal input end of the controller; 104. Clock signal output end of the controller; 201. Power signal end of the pressure detection sensor; 202. Pressure signal output end of the pressure detection sensor; 203. Ground end of the pressure detection sensor; 301. Temperature and humidity signal output end of the temperature and humidity detection sensor; 302. Power input end of the temperature and humidity detection sensor; 303. Ground end of the temperature and humidity detection sensor; 304. Clock signal input end of the temperature and humidity detection sensor; 401. Control end of the power supply control switch; 402. Input end of the power supply control switch; 403. Output end of the power supply control switch; U1. Pressure detection chip; U2. Temperature and humidity detection chip; C1. Filter capacitor; Q1. Switching transistor; R1. Gate resistor; 6. Shell; 7. Printed circuit board; 8. Power port; 9. Sampling window; 10. Sealing ring; 11. Hollow structure. DETAILED DESCRIPTION

[0036] In order to enable the personnel in the technical field to better understand the utility model scheme, the technical scheme in the utility model embodiments will be clearly and completely described below in combination with the drawings in the utility model embodiments. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the personnel in the technical field without making creative labor should belong to the scope of protection of the utility model.

[0037] It should be noted that the terms "first", "second" and the like in the specification and claims of the utility model and the above-described drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to the clearly listed steps or units, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0038] Figure 1 This is a schematic diagram of a temperature, humidity, and pressure detection circuit provided in an embodiment of the present invention. Figure 1 As shown, the temperature, humidity, and pressure detection circuit includes a controller 1, a pressure sensor 2, a temperature and humidity sensor 3, and a power supply control switch 4. The pulse signal output terminal 101 of the controller 1 is electrically connected to the control terminal 401 of the power supply control switch 4; the input terminal 402 of the power supply control switch 4 is electrically connected to the external power supply terminal 5; the output terminal 403 of the power supply control switch 4 is electrically connected to the power signal terminal 201 of the pressure sensor 2; the pressure signal output terminal 202 of the pressure sensor 2 is electrically connected to the pressure signal input terminal 102 of the controller 1; and the temperature and humidity signal output terminal 301 of the temperature and humidity sensor 3 is electrically connected to the temperature and humidity signal input terminal 103 of the controller 1.

[0039] The controller 1 can output a pulse signal from the pulse signal output terminal 101 to the control terminal 401 of the power supply control switch 4, thereby periodically controlling the on / off state of the power supply control switch 4. This allows for intermittent power supply to the pressure sensor 2, which, compared to continuous power supply, effectively reduces power consumption and heat accumulation. Simultaneously, the controller 1 can receive the ambient pressure signal detected by the pressure sensor 2 through the pressure signal input terminal 102, and the ambient temperature and relative humidity signals detected by the temperature and humidity sensor 3 through the temperature and humidity signal input terminal 103. This enables the controller 1 to acquire real-time parameters such as ambient temperature, relative humidity, and pressure, and to process and store these parameters. Furthermore, the controller 1 can communicate with display devices, embedded systems, or the cloud to transmit data for further analysis or remote monitoring. For example, controller 1 may include a microcontroller chip, such as STM32 series microcontroller chips, ESP32 microcontroller chips and ATmega328P microcontroller chips, etc. The specific model can be selected according to the actual application requirements, and this utility model does not make specific limitations in this regard.

[0040] The pressure detection sensor 2 is used to measure the ambient pressure, and can include a Micro-Electro-Mechanical Systems (MEMS) pressure sensor or a piezoresistive pressure sensor. For example, the piezoresistive pressure sensor converts the resistance change caused by the pressure deformation of the sensitive diaphragm into a voltage signal through a Wheatstone bridge, and outputs the measured ambient pressure signal to the controller 1 through the pressure signal output end 202 after signal conditioning. The working current of the piezoresistive pressure sensor is about 10 mA, which is the main source of power consumption in the temperature and humidity pressure detection circuit. Therefore, the pressure detection sensor 2 is the main heat generating element in the temperature and humidity pressure detection circuit, and needs to be intermittently powered by the power supply control switch 4 to reduce the influence of power consumption and heat accumulation of the detection sensor 2 on the temperature and humidity detection sensor 3.

[0041] The temperature and humidity detection sensor 3 is used to measure the ambient temperature and relative humidity, and can include a capacitive temperature and humidity sensor and a digital temperature and humidity sensor. For example, the capacitive temperature and humidity sensor detects the moisture content in the air by the change of the dielectric constant of the humidity-sensitive dielectric material, and detects the ambient temperature by the temperature sensor built-in the capacitive temperature and humidity sensor, and then determines the ambient relative humidity, and can output the measured ambient temperature signal and ambient relative humidity signal to the controller 1 through the temperature and humidity signal output end 301. The working current of the temperature and humidity detection sensor 3 is only in the order of μA, and the power consumption is low. It can be understood that the temperature and humidity detection sensor 3 needs to determine the ambient relative humidity according to the moisture content in the air and the current ambient temperature, so the measurement of the ambient relative humidity is greatly affected by the ambient temperature, and the accuracy of the ambient relative humidity measurement requires higher stability of the ambient temperature. It can also be understood that the temperature and humidity detection sensor 3 can output the ambient temperature signal and the ambient relative humidity signal to the controller 1 through the Inter-Integrated Circuit (I 2 C) method, that is, in each sampling period, the temperature and humidity detection sensor 3 can transmit the measured ambient temperature signal and ambient relative humidity signal to the controller 1 through the temperature and humidity signal output end 301 at the same time, and the controller 1 can analyze the data received by the temperature and humidity signal input end 103 to determine the temperature and relative humidity of the current environment, reducing the communication time and improving the sampling efficiency.

[0042] The power supply control switch 4 is used to control the power supply state of the pressure detection sensor 2. For example, the power supply control switch 4 can include a MOS transistor or a relay or other electronic switching device. Specifically, the control end 401 of the power supply control switch 4 is electrically connected to the pulse signal output end 101 of the controller 1, the input end 402 of the power supply control switch 4 is electrically connected to the external power supply end 5, and the output end 403 of the power supply control switch 4 is electrically connected to the power signal end 201 of the pressure detection sensor 2. The pulse signal output by the controller 1 includes a high level signal and a low level signal. In an example embodiment, when the pulse signal output by the controller 1 is a low level signal, the power supply control switch 4 is turned on, so that the power supply control switch 4 can provide the power signal provided by the external power supply end 5 to the pressure detection sensor 2. At this time, the pressure detection sensor 2 receives power supply and starts to measure the ambient pressure, and can transmit the measured ambient pressure value to the controller 1. When the pulse signal output by the controller 1 is a high level signal, the power supply control switch 4 is turned off. At this time, the pressure detection sensor 2 cannot receive power supply from the external power supply end 5, and the pressure detection sensor 2 will stop measuring the ambient pressure.

[0043] It can be understood that the pulse signal output by the controller 1 can adjust the power supply time of the pressure detection sensor 2 in a sampling period. For example, the sampling period of the temperature and humidity pressure detection circuit is 1s, the controller 1 outputs a low level signal in the first 50ms of each sampling period to make the pressure detection sensor 2 powered on and complete the measurement of the ambient pressure, and outputs a high level signal in the remaining 950ms of each sampling period to turn off the power supply of the pressure detection sensor 2. Therefore, the power supply time of the pressure detection sensor 2 only accounts for 5% of the sampling period. Compared with the mode of continuously supplying power to the pressure detection sensor 2 in a sampling period, the power consumption and heat accumulation of the pressure detection sensor 2 are significantly reduced, the influence of the power consumption and heat accumulation of the pressure detection sensor 2 on the relative humidity detection of the temperature and humidity detection sensor 3 is reduced, and the accuracy and stability of the relative humidity measurement are improved. It can also be understood that the response time of the pressure detection sensor 2 is short. For example, the response time of the pressure detection sensor 2 can be 1ms. After the pressure detection sensor 2 is powered on, the pressure detection sensor 2 can complete the measurement of the ambient pressure in a very short time and output to the controller 1. Therefore, before the power supply of the pressure detection sensor 2 is stopped, the temperature and humidity pressure detection circuit has completed the measurement and storage of the ambient pressure value in a sampling period, ensuring the accuracy of the measurement of the temperature and humidity pressure detection circuit.

[0044] The embodiment sets the controller, the pressure detection sensor, the temperature and humidity detection sensor and the power supply control switch in the temperature and humidity pressure detection circuit, electrically connects the pressure signal output end of the pressure detection sensor with the pressure signal input end of the controller, so that the pressure detection sensor can output the measured environmental pressure signal to the controller, electrically connects the temperature and humidity signal output end of the temperature and humidity detection sensor with the temperature and humidity signal input end of the controller, so that the temperature and humidity detection sensor can output the measured environmental temperature signal and environmental relative humidity signal to the controller, so that the controller can acquire the temperature, relative humidity and pressure and the like of the environment in real time, and can process and store the acquired temperature, relative humidity and pressure and the like of the environment in real time. In addition, the pulse signal output end of the controller is electrically connected with the control end of the power supply control switch, the input end of the power supply control switch is electrically connected with the external power supply end, and the output end of the power supply control switch is electrically connected with the power signal end of the pressure detection sensor, so that the on-off of the power supply control switch can be periodically controlled by the pulse signal output by the controller, and the intermittent power supply of the pressure detection sensor can be realized by adjusting the on-off of the power supply control switch, so that the power consumption and heat accumulation of the pressure detection sensor are significantly reduced, and the influence of the power consumption and heat accumulation of the pressure detection sensor on the temperature and humidity detection sensor when detecting the environmental relative humidity is reduced, so that the accuracy and stability of the environmental relative humidity measurement are improved.

[0045] Optionally, Figure 2 The circuit connection diagram of the temperature and humidity pressure detection circuit provided by the embodiment of the utility model is shown in Figure 2 The power supply control switch 4 includes a switching transistor Q1; the gate of the switching transistor Q1 is electrically connected with the pulse signal output end 101 of the controller 1; the first pole of the switching transistor Q1 is electrically connected with the external power supply end 5, and the second pole of the switching transistor Q1 is electrically connected with the power signal end 201 of the pressure detection sensor 2.

[0046] The switching transistor Q1 includes a P-channel transistor and an N-channel transistor, when the source voltage of the P-channel transistor is higher than the gate voltage, the P-channel transistor will form a conductive channel, and when the source voltage of the N-channel transistor is lower than the gate voltage, the N-channel transistor will form a conductive channel. The first pole of the switching transistor Q1 can be specifically understood as one of the source or drain of the switching transistor Q1, and the second pole of the switching transistor Q1 can be specifically understood as the other of the source or drain of the switching transistor Q1. In an exemplary embodiment, still referring to Figure 2The switch transistor Q1 is a P-channel transistor, the first electrode of the switch transistor Q1 is the source electrode of the switch transistor Q1, and the second electrode of the switch transistor Q1 is the drain electrode of the switch transistor Q1. Specifically, the gate electrode of the switch transistor Q1 is electrically connected to the pulse signal output end 101 of the controller 1, the source electrode of the switch transistor Q1 is electrically connected to the external power supply end 5, and the second electrode of the switch transistor Q1 is electrically connected to the power supply signal end 201 of the pressure detection sensor 2. The voltage of the source electrode of the switch transistor Q1 is the voltage provided by the external power supply end 5. For example, the voltage of the source electrode of the switch transistor Q1 can be 5V. When the pulse signal output by the controller 1 is a low-level signal, for example, when the low-level signal output by the controller 1 is 3V, the gate voltage of the switch transistor Q1 is 3V. At this time, the switch transistor Q1 is turned on, so that the switch transistor Q1 can provide the 5V power supply signal provided by the external power supply end 5 to the pressure detection sensor 2. At this time, the pressure detection sensor 2 receives power and starts to measure the ambient pressure, and can transmit the measured ambient pressure value to the controller 1. When the pulse signal output by the controller 1 is a high-level signal, for example, when the low-level signal output by the controller 1 is 5V, the gate voltage of the switch transistor Q1 is 5V. At this time, the switch transistor Q1 is turned off. At this time, the pressure detection sensor 2 cannot receive power from the external power supply end 5, and the pressure detection sensor 2 will stop measuring the ambient pressure. By periodically controlling the on-off of the switch transistor Q1 through the pulse signal output by the controller 1, intermittent power supply to the pressure detection sensor 2 is realized, which significantly reduces the power consumption and heat accumulation of the pressure detection sensor 2, thereby reducing the influence of the power consumption and heat accumulation of the pressure detection sensor 2 on the relative humidity detection of the temperature and humidity detection sensor 3, thereby improving the accuracy and stability of the relative humidity measurement.

[0047] Optionally, the power supply control switch 4 further comprises a gate resistor R1, and the first end of the gate resistor R1 is electrically connected to the external power supply end 5, and the second end of the gate resistor R1 is electrically connected to the gate electrode of the switch transistor Q1.

[0048] The gate resistor R1 is used to control the charging and discharging rate of the gate of the switching transistor Q1. Specifically, the first end of the gate resistor R1 is electrically connected to the external power supply end 5, and the second end of the gate resistor R1 is electrically connected to the gate of the switching transistor Q1. When the pulse signal output by the controller 1 is a low-level signal, the switching transistor Q1 is turned on. At this time, the gate resistor R1 can limit the charging efficiency of the gate of the switching transistor Q1, avoiding the switching transistor Q1 from being turned on too quickly. When the pulse signal output by the controller 1 is a high-level signal, the switching transistor Q1 is turned off. At this time, the gate resistor R1 can limit the discharging efficiency of the gate of the switching transistor Q1. When the charging and discharging rate of the switching transistor Q1 is too fast, a large current generated thereby can impact the gate of the switching transistor Q1, resulting in an increase in the loss of the switching transistor Q1. By limiting the charging and discharging efficiency of the switching transistor Q1 through the gate resistor R1, the oscillation of the gate of the switching transistor Q1 can be suppressed, the switching of the switching transistor Q1 can be more stable, the risk of false triggering can be reduced, and the safety and stability of the temperature and humidity pressure detection circuit can be improved.

[0049] Optionally, the pressure detection sensor 2 comprises a pressure detection chip U1 and a filter capacitor C1. The power signal end 201 of the pressure detection chip U1 is electrically connected to the output end 403 of the power supply control switch 4, the ground end 203 of the pressure detection chip U1 is grounded, and the pressure signal output end 202 of the pressure detection chip U1 is electrically connected to the pressure signal input end 102 of the controller 1. The first end of the filter capacitor C1 is electrically connected to the pressure signal output end 202 of the pressure detection chip U1, and the second end of the filter capacitor C1 is grounded.

[0050] The pressure detection chip U1 is used to measure the environmental pressure. Specifically, the power signal end 201 of the pressure detection chip U1 is electrically connected to the output end 403 of the power supply control switch 4, the ground end 203 of the pressure detection chip U1 is grounded, and the pressure signal output end 202 of the pressure detection chip U1 is electrically connected to the pressure signal input end 102 of the controller 1. After the pressure detection chip U1 receives the power signal provided by the power supply control switch 4, it starts to measure the environmental pressure and can output the measured environmental pressure value to the controller 1 through the pressure signal output end 202, so that the controller 1 can obtain the pressure parameter of the environment in real time and can perform data processing and storage on the obtained pressure parameter of the environment in real time. In addition, the first end of the filter capacitor C1 is electrically connected to the pressure signal output end 202 of the pressure detection chip U1, and the second end of the filter capacitor C1 is grounded, so that the filter capacitor C1 can filter out the high-frequency noise and interference in the pressure signal output by the pressure detection chip U1, making the pressure signal output by the pressure detection chip U1 more stable, thereby improving the accuracy of the environmental pressure measurement.

[0051] Optionally, the temperature and humidity detection sensor 3 comprises a temperature and humidity detection chip U2; a power input end 302 of the temperature and humidity detection chip U2 is electrically connected with the external power supply end 5, a grounding end 303 of the temperature and humidity detection chip U2 is grounded, and a temperature and humidity signal output end 301 of the temperature and humidity detection chip U2 is electrically connected with the temperature and humidity signal input end 103 of the controller 1.

[0052] The temperature and humidity detection chip U2 is used for measuring the ambient temperature and the relative humidity. For example, the temperature and humidity detection chip U2 can be a temperature and humidity detection chip based on the capacitive effect. Specifically, the power input end 302 of the temperature and humidity detection chip U2 is electrically connected with the external power supply end 5, the grounding end 303 of the temperature and humidity detection chip U2 is grounded, and the temperature and humidity signal output end 301 of the temperature and humidity detection chip U2 is electrically connected with the temperature and humidity signal input end 103 of the controller 1. In this way, the temperature and humidity detection chip U2 can detect the water content in the air and the ambient temperature, determine the relative humidity of the environment, and output the measured ambient temperature signal and the relative humidity signal of the environment to the controller 1 through the temperature and humidity signal output end 301. The controller 1 can acquire the temperature and the relative humidity of the environment in real time, and can process and store the acquired temperature and relative humidity of the environment.

[0053] Optionally, a clock signal input end 304 of the temperature and humidity detection chip U2 is electrically connected with the clock signal output end 104 of the controller 1.

[0054] Specifically, controller 1 sends a clock signal to the clock signal input terminal 304 of temperature and humidity detection chip U2 via clock signal output terminal 104, thereby controlling the sampling period and output signal period of temperature and humidity detection chip U2. For example, when controller 1 does not send a clock signal to temperature and humidity detection chip U2, temperature and humidity detection chip U2 is in standby mode and does not sample or output temperature and humidity signals to controller 1. When controller 1 sends a clock signal to temperature and humidity detection chip U2, temperature and humidity detection chip U2 can measure the ambient temperature and relative humidity according to a set timing sequence, and can send ambient temperature and relative humidity signals to controller 1 according to the set timing sequence. Simultaneously, controller 1 can receive and analyze the ambient temperature and relative humidity signals input by temperature and humidity detection chip U2 according to the timing sequence set by the clock signal, thereby determining the current ambient temperature and relative humidity, avoiding data loss or data transmission asynchrony issues. Understandably, by transmitting the clock signal, the temperature and humidity detection chip U2 can be ensured to accurately sample and transmit data once within each sampling cycle. For example, when the sampling cycle of the temperature, humidity, and pressure detection circuit is 1 second, the timing of the clock signal controlling the sampling and data transmission of the temperature and humidity detection chip U2 is also set to 1 second. This allows the temperature and humidity detection chip U2 to measure the ambient temperature and relative humidity once every 1 second and send the ambient temperature and relative humidity signals to the controller 1 once every 1 second. Simultaneously, the controller 1 can receive and analyze the ambient temperature and relative humidity signals input by the temperature and humidity detection chip U2 once every 1 second, enabling the controller 1 to acquire the ambient temperature and relative humidity parameters in real time within each sampling cycle. Precisely controlling the sampling and output timing of the temperature and humidity monitoring chip U2 using the clock signal ensures the synchronization and accuracy of data transmission, while also reducing power consumption and improving the accuracy of the temperature, humidity, and pressure detection circuit measurements.

[0055] Optional, Figure 3 A schematic diagram of a temperature, humidity and pressure detection device provided in an embodiment of this utility model is shown below. Figure 3 As shown, the temperature and humidity detection device includes a housing 6, a printed circuit board 7 disposed inside the housing 6, and a temperature, humidity and pressure detection circuit as described in the above embodiment; the temperature, humidity and pressure detection circuit is disposed on the first side surface of the printed circuit board 7; the temperature, humidity and pressure detection circuit is electrically connected to an external power supply terminal through the printed circuit board 7.

[0056] The temperature and humidity pressure detection circuit comprises a controller 1, a pressure detection sensor 2, a temperature and humidity detection sensor 3 and a power supply control switch 4. The temperature and humidity pressure detection circuit is arranged on the first side surface of the printed circuit board 7, that is, the elements in the temperature and humidity pressure detection circuit are electrically connected through the printed circuit board and are integrally packaged in the shell 6. In an optional embodiment, the controller 1, the pressure detection sensor 2 and the temperature and humidity detection sensor 3 are arranged in sequence on the printed circuit board 7 along the first direction X. Specifically, the controller 1, the pressure detection sensor 2 and the temperature and humidity detection sensor 3 can be fixed on the printed circuit board 7 by surface mounting technology or through-hole mounting technology to realize signal transmission between the controller 1, the pressure detection sensor 2 and the temperature and humidity detection sensor 3 and ensure the stability of the structure of the temperature and humidity detection device. The first direction X can be determined according to actual needs, and the utility model does not make specific limitation here. For example, referring to Figure 3 , the first direction X can be a vertical direction. In addition, the temperature and humidity pressure detection circuit is electrically connected with an external power supply end through the printed circuit board 7, so that the external power supply end can supply power to the temperature and humidity pressure detection circuit and ensure the normal work of the temperature and humidity pressure detection circuit. For example, the printed circuit board 7 can be electrically connected with the external power supply end through a power supply port 8, wherein the power supply port 8 can adopt a pin, a terminal or a gold finger structure. It can also be understood that the printed circuit board 7 can also be connected with a vehicle-mounted system through the power supply port 8, so that the controller 1 can transmit the data such as temperature, relative humidity and pressure of the environment obtained in real time to the vehicle-mounted system for further analysis or remote monitoring.

[0057] Optionally, referring to Figure 3 , the temperature and humidity pressure detection device comprises a sampling window 9 arranged on the shell 6; in the direction perpendicular to the first side surface of the printed circuit board 7, the sampling window 9 overlaps the temperature and humidity detection sensor 3.

[0058] Specifically, the sampling window 9 is arranged on the shell 6. The sampling window 9 allows external environment air to enter, and in the direction perpendicular to the first side surface of the printed circuit board 7, the sampling window 9 overlaps the temperature and humidity detection sensor 3, so that the temperature and humidity detection sensor 3 and the pressure detection sensor 2 can directly contact with the external air through the sampling window 9, so that the temperature and humidity detection sensor 3 and the pressure detection sensor 2 can sample the real environment data, thereby improving the accuracy and stability of the measurement of the temperature and humidity pressure detection circuit. For example, the sampling window 9 can be closed by a waterproof and dustproof breathable film to prevent dust, liquid or other pollutants from entering the temperature and humidity pressure detection device, thereby prolonging the service life of the temperature and humidity pressure detection device.

[0059] In addition, the shell 6 of the temperature and humidity pressure detection device is further provided with a sealing ring 10, the sealing ring 10 can enhance the sealing performance of the temperature and humidity pressure detection device, for example, the sealing ring 10 can be made of silica gel or rubber and the like. The sealing ring 10 can prevent dust, moisture and other particles from entering the inside of the temperature and humidity pressure detection device, and can reduce the influence of external airflow interference and mechanical vibration, improve the stability and durability of the temperature and humidity pressure detection device, and further improve the accuracy and stability of the temperature and humidity pressure detection circuit measurement.

[0060] Optionally, as shown in Figure 4 The printed circuit board 7 is provided with a hollow structure 11; the hollow structure 11 is located at least between the pressure detection sensor 2 and the temperature and humidity detection sensor 3.

[0061] Specifically, the hollow structure 11 is arranged between the pressure detection sensor 2 and the temperature and humidity detection sensor 3 on the printed circuit board 7, the hollow structure 11 can optimize the heat conduction path between the pressure detection sensor 2 and the temperature and humidity detection sensor 3, when the hollow structure 11 is not arranged, the heat generated by the pressure detection sensor 2 during work will be quickly conducted to the temperature and humidity detection sensor 3 along the printed circuit board 7, and the heat insulation effect is poor. By arranging the hollow structure 11, the heat transfer path between the pressure detection sensor 2 and the temperature and humidity detection sensor 3 becomes narrow and long, which increases the difficulty of heat diffusion and forms a good heat insulation effect, reduces the influence of the power consumption and heat accumulation of the pressure detection sensor 2 on the temperature and humidity detection sensor 3 when detecting the relative humidity of the environment, thereby improving the accuracy and stability of the relative humidity measurement of the environment. On the premise of ensuring that the hollow structure 11 can form a good heat insulation effect, the width of the hollow structure 11 in the first direction X along the arrangement of the pressure detection sensor 2 and the temperature and humidity detection sensor 3 can be determined according to actual needs, and the present application does not make specific limitation, for example, the width of the hollow structure 11 in the first direction X along the arrangement of the pressure detection sensor 2 and the temperature and humidity detection sensor 3 can be greater than or equal to 3mm.

[0062] The temperature and humidity pressure detection device described above includes the temperature and humidity pressure detection circuit provided by any embodiment of the present application, and has the corresponding functions and advantages of the temperature and humidity pressure detection circuit. The technical details not described in detail in the present embodiment can be referred to the temperature and humidity pressure detection circuit provided by any embodiment of the present application.

[0063] Since the temperature and humidity pressure detection device includes the temperature and humidity pressure detection circuit in the embodiments of the present application, based on the temperature and humidity pressure detection circuit described in the embodiments of the present application, those skilled in the art can understand the specific implementation of the temperature and humidity pressure detection device of the present application and its various forms, so the beneficial effects of the temperature and humidity pressure detection device how to realize the temperature and humidity pressure detection circuit in the embodiments of the present application will not be introduced in detail. As long as the temperature and humidity pressure detection device including the temperature and humidity pressure detection circuit in the embodiments of the present application is implemented by those skilled in the art, it belongs to the scope of the present application.

[0064] The above specific implementation does not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A temperature and humidity pressure detection circuit, characterized by, include: Controller, pressure sensor, temperature and humidity sensor, and power control switch; The pulse signal output terminal of the controller is electrically connected to the control terminal of the power supply control switch; The input terminal of the power supply control switch is electrically connected to an external power source, and the output terminal of the power supply control switch is electrically connected to the power signal terminal of the pressure detection sensor. The pressure signal output terminal of the pressure detection sensor is electrically connected to the pressure signal input terminal of the controller. The temperature and humidity signal output terminal of the temperature and humidity detection sensor is electrically connected to the temperature and humidity signal input terminal of the controller.

2. The temperature-humidity-pressure detection circuit according to claim 1, wherein The power supply control switch includes a switching transistor; The gate of the switching transistor is electrically connected to the pulse signal output terminal of the controller; the first terminal of the switching transistor is electrically connected to the external power supply terminal, and the second terminal of the switching transistor is electrically connected to the power signal terminal of the pressure detection sensor.

3. The temperature-humidity-pressure detection circuit according to claim 2, wherein The power supply control switch also includes a gate resistor; The first end of the gate resistor is electrically connected to the external power supply terminal, and the second end of the gate resistor is electrically connected to the gate of the switching transistor.

4. The temperature-humidity-pressure detection circuit according to claim 1, wherein The pressure detection sensor includes a pressure detection chip and a filter capacitor; The power signal terminal of the pressure detection chip is electrically connected to the output terminal of the power supply control switch, the ground terminal of the pressure detection chip is grounded, and the pressure signal output terminal of the pressure detection chip is electrically connected to the pressure signal input terminal of the controller. The first end of the filter capacitor is electrically connected to the pressure signal output terminal of the pressure detection chip, and the second end of the filter capacitor is grounded.

5. The temperature-humidity-pressure detection circuit according to claim 1, wherein The temperature and humidity detection sensor includes a temperature and humidity detection chip; The power input terminal of the temperature and humidity detection chip is electrically connected to the external power supply terminal, the ground terminal of the temperature and humidity detection chip is grounded, and the temperature and humidity signal output terminal of the temperature and humidity detection chip is electrically connected to the temperature and humidity signal input terminal of the controller.

6. The temperature and humidity pressure detection circuit according to claim 5, wherein The clock signal input terminal of the temperature and humidity detection chip is electrically connected to the clock signal output terminal of the controller.

7. A temperature and humidity pressure detection device, characterized by, include: The housing, the printed circuit board disposed within the housing, and the temperature, humidity, and pressure detection circuit as described in any one of claims 1-6; The temperature, humidity and pressure detection circuit is disposed on the first side surface of the printed circuit board; The temperature, humidity, and pressure detection circuit is electrically connected to an external power supply via the printed circuit board.

8. The temperature-humidity-pressure detection apparatus according to claim 7, wherein The controller, the pressure sensor, and the temperature and humidity sensor are arranged sequentially on the printed circuit board along the first direction.

9. The temperature-humidity-pressure detection apparatus according to claim 7, wherein Also includes: The sampling window is located on the outer casing; In a direction perpendicular to the first side surface of the printed circuit board, the sampling window overlaps with the temperature and humidity detection sensor.

10. The temperature-humidity-pressure detection apparatus according to claim 8, wherein The printed circuit board has a hollow structure. The hollow structure is located at least between the pressure sensor and the temperature and humidity sensor.

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