CN216869646U - Explosion-proof type temperature and humidity sensor - Google Patents
Explosion-proof type temperature and humidity sensor Download PDFInfo
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- CN216869646U CN216869646U CN202220467969.XU CN202220467969U CN216869646U CN 216869646 U CN216869646 U CN 216869646U CN 202220467969 U CN202220467969 U CN 202220467969U CN 216869646 U CN216869646 U CN 216869646U
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Abstract
The utility model discloses an explosion-proof temperature and humidity sensor which comprises a probe circuit, an explosion-proof power supply circuit and a communication circuit, wherein the probe circuit is connected with the explosion-proof power supply circuit; the explosion-proof power supply circuit comprises a one-way conduction diode D1, capacitors C4, C6, C8, a voltage stabilizer C5, diodes D4, D5 and D7, wherein the anode of the one-way conduction diode D1 is communicated with a 12V power supply, the cathode of the one-way conduction diode D1 is connected with the anode of the capacitor C4 and then connected with the input end of a voltage stabilizer C5, and the input end of the voltage stabilizer C5 is sequentially connected with the anode of the capacitor C6 and then sequentially connected with the anodes of the diodes D4, D5 and D7 through one end of a capacitor C8. The temperature sensitive element U3 provided by the utility model omits a conventional ad acquisition circuit, so that the cost is reduced, the detonation probability of a discrete circuit is reduced, and the intrinsic safety explosion-proof performance of the circuit is improved; the working current of the capacitance humidity sensitive element U4 is microampere level, the required energy is extremely low, and the explosion-proof performance of the intrinsic safety circuit is improved; d1 is a unidirectional diode, which effectively prevents ac current from flowing from the external circuit.
Description
Technical Field
The utility model relates to an explosion-proof temperature and humidity sensor which is suitable for the technical field of sensing.
Background
The temperature and humidity sensor mostly uses a temperature and humidity integrated probe as a temperature measuring element, collects temperature and humidity signals, converts the temperature and humidity signals into current signals or voltage signals which are in linear relation with the temperature and humidity after being processed by circuits such as voltage stabilization filtering, operational amplification, nonlinear correction, V/I conversion, constant current and reverse protection and the like, and outputs the current signals or the voltage signals, and can also directly output interfaces such as 485 or 232 through a main control chip.
The existing temperature and humidity sensor is not provided with an explosion-proof protection unit either in a power supply circuit or a probe circuit, so that the explosion-proof performance is poor and the service life is short.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an explosion-proof temperature and humidity sensor.
The technical solution for realizing the purpose of the utility model is as follows: an explosion-proof temperature and humidity sensor comprising:
the probe circuit is used for acquiring and uploading temperature and humidity;
the explosion-proof power circuit is used for supplying power to the probe circuit; and
the communication circuit is used for communicating the probe circuit with external equipment;
the explosion-proof power supply circuit comprises a unidirectional conducting diode D1, capacitors C4, C6, C8, a voltage stabilizer C5, diodes D4, D5 and D7, wherein the anode of the unidirectional conducting diode D1 is communicated with a 12V power supply, the cathode of the unidirectional conducting diode D1 is connected with the anode of the capacitor C4 and then connected with the input end of the voltage stabilizer C5, the input end of the voltage stabilizer C5 is sequentially connected with the anode of the capacitor C6 and then sequentially connected with the anodes of the diodes D4, D5 and D7 through one end of the capacitor C8, and the anodes of the diodes D7, D5 and D4 are sequentially connected and then sequentially connected with the cathodes of the capacitors C6, the voltage stabilizer C5 and the capacitor C4 and then grounded.
Further, the probe circuit comprises a temperature sensing element U3, a single chip microcomputer JP1 and a capacitance humidity sensing element U4, and the temperature sensing element U3 and the capacitance humidity sensing element U4 are respectively connected with the single chip microcomputer JP 1.
Further, the model of the temperature sensitive element U3 is 18B 20.
Further, the communication circuit comprises a communication chip JP2 and a TVS bidirectional lightning protection diode D9, the TVS bidirectional lightning protection diode D9 is connected with the communication chip JP2, and the communication chip JP2 is connected with a single chip microcomputer JP 1.
Further, the diodes D4, D5, and D7 are all clamping warm-pressing diodes.
Further, the capacitors C4 and C6 are polar capacitors, and the capacitor C8 is a non-polar capacitor.
Compared with the prior art, the utility model has the remarkable advantages that: the temperature sensing element U3 converts the environment temperature into a digital temperature signal, and directly uploads the digital temperature signal to the singlechip JP1 through the No. 2 pin of U3, so that the temperature signal is read, a conventional ad acquisition circuit is omitted, the cost is reduced, the detonation probability of a discrete circuit is reduced, and the intrinsic safety explosion-proof performance of the circuit is improved; the capacitance humidity-sensitive element U4 measures the environment humidity and uploads the environment humidity to the single chip microcomputer JP1, the working current is microampere, the required energy is extremely low, and the explosion-proof performance of the intrinsically safe circuit is improved; d1 is a one-way conduction diode, so that alternating current is effectively prevented from flowing from an external circuit, and the integral intrinsic safety explosion-proof performance of the circuit is improved; the TVS bidirectional lightning protection diode D9 is arranged on the communication circuit, so that peak surge and pulse flowing in from an external circuit are effectively prevented, and the integral intrinsic safety explosion-proof performance of the circuit is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments of the present invention or the prior art are briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
Referring to fig. 1, an explosion-proof temperature and humidity sensor comprises a probe circuit, an explosion-proof power circuit and a communication circuit, wherein the probe circuit comprises a temperature-sensitive element U3, a single chip microcomputer JP1, a capacitance humidity-sensitive element U4, a connector JP3, a light-emitting diode D8, resistors R1, R3 and R8, a 1 st pin of the temperature-sensitive element U3 is grounded, a 2 nd pin of the temperature-sensitive element U3 is connected with R1, R3 and D8 and then connected with a 7 th pin of the single chip microcomputer JP1, 4 th, 5 th and 6 th pins of the single chip microcomputer JP1 are connected with the connector JP3, the R8 is connected with one end of the capacitance humidity-sensitive element U4 and then connected with a 12 th pin of the single chip microcomputer JP1, a 4 th pin of the connector JP3 is connected between the capacitance humidity-sensitive element U4 and the single chip microcomputer 1, and the other end of the capacitance humidity-sensitive element U4 is grounded. The model of the single chip microcomputer JP1 is PICI6F688, the model of the temperature sensing element U3 is 18B20, and the model of the connector JP3 is HEADER4X 2.
The temperature sensing element U3 converts the environment temperature into a digital temperature signal, and directly uploads the digital temperature signal to the singlechip JP1 through the No. 2 pin of U3, so that the temperature signal is read, a conventional ad acquisition circuit is omitted, the cost is reduced, the detonation probability of a discrete circuit is reduced, and the intrinsic safety explosion-proof performance of the circuit is improved; the capacitor humidity sensor U4 measures the environment humidity and uploads to singlechip JP1, and operating current is microampere level, and required energy is extremely low, promotes the explosion-proof performance of this ampere of circuit.
The explosion-proof power supply circuit comprises a unidirectional conduction diode D1, capacitors C4, C6, C8, a voltage stabilizer C5, diodes D4, D5 and D7, wherein the anode of the unidirectional conduction diode D1 is communicated with a 12V power supply, the cathode of the unidirectional conduction diode D1 is connected with the anode of the capacitor C4 and then connected with the input end of a voltage stabilizer C5, the input end of the voltage stabilizer C5 is sequentially connected with the anode of the capacitor C6 and then sequentially connected with the anodes of the diodes D4, D5 and D7 through one end of a capacitor C8, the anodes of the diodes D7, D5 and D4 are sequentially connected and then sequentially connected with the cathodes of the capacitors C6, the voltage stabilizer C5 and the capacitor C4 through the other end of a capacitor C8 and then grounded, and the explosion-proof power supply circuit is used for supplying power to the probe circuit, wherein D1 is a unidirectional conduction diode, thereby effectively preventing the AC from flowing from an external line and improving the whole intrinsic safety explosion-proof performance of the circuit. The capacitors C4 and C6 are polar capacitors, the capacitor C8 is a nonpolar capacitor, and the diodes D4, D5 and D7 are clamping temperature-voltage diodes, so that the voltage can be limited to be within 5.5v, and the overvoltage and overcurrent of the circuit caused by overvoltage are guaranteed.
The communication circuit comprises a communication chip JP2 and a TVS bidirectional lightning protection diode D9, the anode of the TVS bidirectional lightning protection diode D9 is connected with the 7 th pin of the communication chip JP2, the cathode of the TVS bidirectional lightning protection diode D9 is connected with the 6 th pin of the communication chip JP2, the communication chip JP2 is connected with a single chip microcomputer JP1, the communication chip JP2 is an RS485 communication chip, and the model number of the communication chip JP2 is 75LBCI 84. Realize probe circuit and external equipment through communication circuit and communicate, D9 is TVS two-way lightning protection diode, effectively prevents the spike surge and the pulse that flow into from the external line, promotes the whole intrinsic safety explosion-proof performance of circuit.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. An explosion-proof type temperature and humidity sensor, its characterized in that includes:
the probe circuit is used for acquiring and uploading temperature and humidity;
the explosion-proof power circuit is used for supplying power to the probe circuit; and
the communication circuit is used for communicating the probe circuit with external equipment;
the explosion-proof power supply circuit comprises a unidirectional conducting diode D1, capacitors C4, C6, C8, a voltage stabilizer C5, diodes D4, D5 and D7, wherein the anode of the unidirectional conducting diode D1 is communicated with a 12V power supply, the cathode of the unidirectional conducting diode D1 is connected with the anode of the capacitor C4 and then connected with the input end of the voltage stabilizer C5, the input end of the voltage stabilizer C5 is sequentially connected with the anode of the capacitor C6 and then sequentially connected with the anodes of the diodes D4, D5 and D7 through one end of the capacitor C8, and the anodes of the diodes D7, D5 and D4 are sequentially connected and then sequentially connected with the cathodes of the capacitors C6, the voltage stabilizer C5 and the capacitor C4 and then grounded.
2. The explosion-proof temperature and humidity sensor as claimed in claim 1, wherein the probe circuit comprises a temperature sensing element U3, a single chip microcomputer JP1 and a capacitance humidity sensing element U4, and the temperature sensing element U3 and the capacitance humidity sensing element U4 are respectively connected with the single chip microcomputer JP 1.
3. The explosion-proof temperature and humidity sensor as claimed in claim 2, wherein the temperature sensitive element U3 is 18B 20.
4. The explosion-proof temperature and humidity sensor as recited in claim 1, wherein the communication circuit comprises a communication chip JP2 and a TVS bidirectional lightning protection diode D9, the TVS bidirectional lightning protection diode D9 is connected with the communication chip JP2, and the communication chip JP2 is connected with a single chip microcomputer JP 1.
5. The explosion-proof temperature and humidity sensor according to claim 1, wherein the diodes D4, D5 and D7 are all clamping temperature and voltage diodes.
6. The explosion-proof temperature and humidity sensor as claimed in claim 1, wherein the capacitors C4 and C6 are polar capacitors, and the capacitor C8 is a non-polar capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220467969.XU CN216869646U (en) | 2022-03-04 | 2022-03-04 | Explosion-proof type temperature and humidity sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220467969.XU CN216869646U (en) | 2022-03-04 | 2022-03-04 | Explosion-proof type temperature and humidity sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216869646U true CN216869646U (en) | 2022-07-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220467969.XU Active CN216869646U (en) | 2022-03-04 | 2022-03-04 | Explosion-proof type temperature and humidity sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216869646U (en) |
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2022
- 2022-03-04 CN CN202220467969.XU patent/CN216869646U/en active Active
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