CN210776344U - Digital temperature control meter - Google Patents
Digital temperature control meter Download PDFInfo
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- CN210776344U CN210776344U CN201922095426.0U CN201922095426U CN210776344U CN 210776344 U CN210776344 U CN 210776344U CN 201922095426 U CN201922095426 U CN 201922095426U CN 210776344 U CN210776344 U CN 210776344U
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Abstract
The utility model relates to the field of temperature control instruments, and discloses a digital temperature control meter, which comprises a temperature sensor, a self-correcting zero amplifier, a single chip microcomputer, a feedback time proportional operator, a temperature adjusting device, a rotary coding temperature setting device, a touch screen and a power module, wherein the output end of the temperature sensor is connected with the input end of the self-correcting zero amplifier, the self-correcting zero amplifier is bidirectionally connected with the single chip microcomputer, and the feedback time proportional operator is bidirectionally connected with the single chip microcomputer; the power supply module comprises a voltage input end, a first resistor, a first voltage-regulator tube, a second resistor, a first triode, a fourth capacitor, a second triode, a first capacitor, a second voltage-regulator tube, a second capacitor, a low-dropout linear voltage regulator, a third capacitor and a voltage output end. Implement the utility model discloses a digit temperature control table has following beneficial effect: the circuit structure is simpler, the cost is lower, convenient maintenance can improve the security and the reliability of circuit.
Description
Technical Field
The utility model relates to a temperature control instrument field, in particular to digital temperature control table.
Background
Temperature measurement is one of the most common non-electrical measurements in industrial systems and daily life, and temperature is also one of the main controlled parameters. With the increasing development of microelectronics, great progress has been made in temperature sensors, operational amplifiers, to a/D converters and display technologies, and the emergence of various (linear, digital) large-scale integrated circuits and integrated temperature sensors has made it possible to develop highly reliable, compact, digitized, and inexpensive temperature control meters. Fig. 1 is a schematic circuit diagram of a power supply portion of a conventional digital temperature control meter, and it can be seen from fig. 1 that the power supply portion of the conventional digital temperature control meter uses many components, has a complex circuit structure and high hardware cost, and is inconvenient to maintain. In addition, since the power supply portion of the conventional digital temperature control table lacks a corresponding circuit protection function, for example: the lack of a circuit interference prevention function results in poor safety and reliability of the circuit.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a circuit structure comparatively simple, the cost is lower, convenient maintenance, can improve the security of circuit and the digital temperature control table of reliability.
The utility model provides a technical scheme that its technical problem adopted is: constructing a digital temperature control table, which comprises a temperature sensor, a self-correcting zero amplifier, a single chip microcomputer, a feedback time proportional operator, a temperature adjusting device, a rotary coding temperature setting device, a touch screen and a power module, wherein the output end of the temperature sensor is connected with the input end of the self-correcting zero amplifier, the self-correcting zero amplifier is bidirectionally connected with the single chip microcomputer, the feedback time proportional operator is bidirectionally connected with the single chip microcomputer, the output end of the feedback time proportional operator is connected with the input end of the temperature adjusting device, the rotary coding temperature setting device is bidirectionally connected with the single chip microcomputer, and the output end of the single chip microcomputer is connected with the touch screen;
the power supply module comprises a voltage input end, a first resistor, a first voltage-regulator tube, a second resistor, a first triode, a fourth capacitor, a second triode, a first capacitor, a second voltage-regulator tube, a second capacitor, a low-dropout linear voltage regulator, a third capacitor and a voltage output end, wherein the voltage input end is respectively connected with one end of the first resistor, one end of the second resistor and a collector electrode of the second triode, the other end of the first resistor is respectively connected with a base electrode of the first triode and a cathode of the first voltage-regulator tube, the other end of the second resistor is connected with a collector electrode of the first triode, an emitter electrode of the first triode is connected with a base electrode of the second triode through the fourth capacitor, and an emitter electrode of the second triode is respectively connected with one end of the first capacitor and a cathode of the second voltage-regulator tube, One end of the second capacitor is connected with the input end of the low-dropout linear regulator, the anode of the first voltage-regulator tube is respectively connected with the other end of the first capacitor and the anode of the second voltage-regulator tube, the output end of the low-dropout linear regulator is respectively connected with one end of the third capacitor and one end of the voltage output end, and the other end of the second capacitor is respectively connected with the grounding end of the low-dropout linear regulator, the other end of the third capacitor and the other end of the voltage output end.
In the digital temperature control table of the present invention, the capacitance of the fourth capacitor is 290 pF.
In the digital temperature control meter of the present invention, the power module further includes a third diode, an anode of the third diode is connected to one end of the second resistor, and a cathode of the third diode is connected to a collector of the second triode.
In the digital temperature control table of the present invention, the third diode has a model of S-822T.
In the digital temperature control table of the present invention, the first triode is an NPN type triode.
In the digital temperature control meter of the present invention, the second triode is an NPN type triode.
Implement the utility model discloses a digit temperature control table has following beneficial effect: because the temperature sensor, the self-correcting zero amplifier, the singlechip, the feedback time proportion arithmetic unit, the temperature adjusting device, the rotary coding temperature setting device, the touch screen and the power module are arranged, the power module comprises a voltage input end, a first resistor, a first voltage-regulator tube, a second resistor, a first triode, a fourth capacitor, a second triode, a first capacitor, a second voltage-regulator tube, a second capacitor, a low-voltage-difference linear voltage regulator, a third capacitor and a voltage output end, compared with the power supply part of the traditional digital temperature control table, the used components are fewer, and because some components are saved, the hardware cost can be reduced, in addition, fourth electric capacity is used for preventing the interference between first triode and the second triode, consequently the utility model discloses circuit structure is comparatively simple, the cost is lower, convenient maintenance, can improve the security and the reliability of circuit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic circuit diagram of the power supply portion of a conventional digital temperature control meter;
FIG. 2 is a schematic structural diagram of an embodiment of the digital temperature control table of the present invention;
fig. 3 is a schematic circuit diagram of the power supply module in the embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the embodiment of the digital temperature control table of the present invention, the schematic structure of the digital temperature control table is shown in fig. 2. In 2, the digital temperature control table comprises a temperature sensor 1, a self-correcting zero amplifier 2, a single chip microcomputer 3, a feedback time proportion arithmetic unit 4, a temperature adjusting device 5, a rotary coding temperature setting device 6, a touch screen 7 and a power supply module 8, wherein the output end of the temperature sensor 1 is connected with the input end of the self-correcting zero amplifier 2, the self-correcting zero amplifier 2 is bidirectionally connected with the single chip microcomputer 3, the feedback time proportion arithmetic unit 4 is bidirectionally connected with the single chip microcomputer 3, the output end of the feedback time proportion arithmetic unit 4 is connected with the input end of the temperature adjusting device 5, the rotary coding temperature setting device 6 is bidirectionally connected with the single chip microcomputer 3, and the output end of the single chip microcomputer 3 is connected with the touch screen 7.
The temperature sensor 1 is used for detecting the ambient temperature and the temperature adjusting device 5 is used for adjusting the temperature. The single chip microcomputer 3 and the self-correcting zero amplifier 2 form a signal acquisition part, the single chip microcomputer 3 and the rotary coding temperature setting device 6 form a temperature setting part, and the single chip microcomputer 3 realizes nonlinear time proportion control, measured temperature display, set temperature display and output indication. The self-correcting zero amplifier 2 can eliminate clutter signals, realize self-correcting zero and reduce the requirement of temperature control on an operational amplifier.
The feedback time proportional arithmetic unit 4 controls the temperature by adopting nonlinear time proportional control, is realized by programming of the singlechip 3, and adjusts the working time of the temperature adjusting device 5, thereby realizing the purpose of temperature control. Various parameters can be input through the touch screen 7, and various parameters of the equipment can also be displayed. The digital temperature control meter is set by matching the rotary encoder with the single chip microcomputer 3, and a nonlinear time proportion control model is realized by programming the single chip microcomputer, so that the traditional temperature control operation habit and advantages are reserved.
In this embodiment, the temperature sensor 1, the self-correcting zero amplifier 2, the single chip microcomputer 3, the feedback time proportional operator 4, the temperature adjusting device 5, the rotary encoding temperature setting device 6 and the touch screen 7 are all implemented by adopting a structure in the prior art, and the working principle of the device is also the working principle in the prior art, which is not described in detail herein.
Fig. 3 is a schematic circuit diagram of the power module in this embodiment, in fig. 3, the power module 8 includes a voltage input terminal Vin, a first resistor R1, a first regulator D1, a second resistor R2, a first transistor Q1, a fourth capacitor C4, a second transistor Q2, a first capacitor C1, a second regulator D2, a second capacitor C2, a low dropout regulator U1, a third capacitor C3, and a voltage output terminal Vo, where the voltage input terminal Vin is connected to one end of the first resistor R1, one end of the second resistor R2, and a collector of the second transistor Q2, the other end of the first resistor R1 is connected to a base of the first transistor Q1 and a cathode of the first regulator D1, the other end of the second resistor R2 is connected to a collector of the first transistor Q1, an emitter of the first transistor Q1 is connected to a base of the second transistor Q5956 through a fourth capacitor C82 4, and an emitter of the second transistor Q8653 is connected to an emitter of the first transistor Q8653, The cathode of the second voltage-regulator tube D2, one end of the second capacitor C2 and the input end of the low dropout linear regulator U1 are connected, the anode of the first voltage-regulator tube D1 is respectively connected with the other end of the first capacitor C1 and the anode of the second voltage-regulator tube D2, the output end of the low dropout linear regulator U1 is respectively connected with one end of the third capacitor C3 and one end of the voltage output end Vo, and the other end of the second capacitor C2 is respectively connected with the grounding end of the low dropout linear regulator U1, the other end of the third capacitor C3 and the other end of the voltage output end Vo.
In this embodiment, compared with the power supply part of the traditional digital temperature control meter, the power module 8 has fewer used components, simpler circuit structure and convenient maintenance, and can reduce the hardware cost due to the saving of some components. In addition, the fourth capacitor C4 is a coupling capacitor for preventing interference between the first transistor Q1 and the second transistor Q2, so that the safety and reliability of the circuit can be improved. The power module 8 uses the fourth capacitor C4 as a coupling element, so that the operating point of the next stage is not affected by the previous stage, i.e., the operating point of the second transistor Q2 is not affected by the first transistor Q1. The fourth capacitor C4 is an inter-stage coupling capacitor, and functions to isolate the dc bias circuits of the front and rear stages of the first transistor Q1 and the second transistor Q2, so as to prevent the static operating points of the front and rear stages from affecting each other. The working principle of the method utilizes the working principle of interstage coupling electricity in the prior art, and the mastiff is not described herein. It should be noted that, in the present embodiment, the capacitance value of the fourth capacitor C4 is 290 pF. Of course, in practical applications, the capacitance value of the fourth capacitor C4 may be adjusted accordingly, that is, the capacitance value of the fourth capacitor C4 may be increased or decreased accordingly.
In this embodiment, the first transistor Q1 is an NPN transistor, and the second transistor Q2 is an NPN transistor. Certainly, in practical applications, the first transistor Q1 and the second transistor Q2 may both adopt PNP transistors, but the circuit structure is also changed accordingly.
In this embodiment, the power module 8 further includes a third diode D3, an anode of the third diode D3 is connected to one end of the second resistor R2, and a cathode of the third diode D3 is connected to a collector of the second transistor Q2. The third diode D3 is a current limiting diode, and is used for current limiting protection of the collector current of the second transistor Q2. The current limiting protection principle is as follows: when the collector current of the second triode Q2 is large, the third diode D3 can reduce the collector current of the second triode Q2 to keep the second triode Q2 in a normal working state, so that the device in the circuit is not burned out due to the large current, and the safety and reliability of the circuit are further enhanced. It should be noted that in the present embodiment, the third diode D3 has a model number S-822T. Of course, in practical applications, the third diode D3 may also be another type of diode with similar functions.
In short, in this embodiment, the power module 8 uses fewer components and parts, has a simpler circuit structure, is convenient to maintain, and can reduce hardware cost due to the fact that some components and parts are saved, compared with the power supply part of the traditional digital temperature control meter. In addition, since the power module 8 is provided with a coupling capacitor, the safety and reliability of the circuit can be improved.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A digital temperature control meter is characterized by comprising a temperature sensor, a self-correcting zero amplifier, a single chip microcomputer, a feedback time proportional arithmetic unit, a temperature adjusting device, a rotary coding temperature setting device, a touch screen and a power supply module, wherein the output end of the temperature sensor is connected with the input end of the self-correcting zero amplifier, the self-correcting zero amplifier is bidirectionally connected with the single chip microcomputer, the feedback time proportional arithmetic unit is bidirectionally connected with the single chip microcomputer, the output end of the feedback time proportional arithmetic unit is connected with the input end of the temperature adjusting device, the rotary coding temperature setting device is bidirectionally connected with the single chip microcomputer, and the output end of the single chip microcomputer is connected with the touch screen;
the power supply module comprises a voltage input end, a first resistor, a first voltage-regulator tube, a second resistor, a first triode, a fourth capacitor, a second triode, a first capacitor, a second voltage-regulator tube, a second capacitor, a low-dropout linear voltage regulator, a third capacitor and a voltage output end, wherein the voltage input end is respectively connected with one end of the first resistor, one end of the second resistor and a collector electrode of the second triode, the other end of the first resistor is respectively connected with a base electrode of the first triode and a cathode of the first voltage-regulator tube, the other end of the second resistor is connected with a collector electrode of the first triode, an emitter electrode of the first triode is connected with a base electrode of the second triode through the fourth capacitor, and an emitter electrode of the second triode is respectively connected with one end of the first capacitor and a cathode of the second voltage-regulator tube, One end of the second capacitor is connected with the input end of the low-dropout linear regulator, the anode of the first voltage-regulator tube is respectively connected with the other end of the first capacitor and the anode of the second voltage-regulator tube, the output end of the low-dropout linear regulator is respectively connected with one end of the third capacitor and one end of the voltage output end, and the other end of the second capacitor is respectively connected with the grounding end of the low-dropout linear regulator, the other end of the third capacitor and the other end of the voltage output end.
2. The digital temperature control table of claim 1, wherein the capacitance value of said fourth capacitor is 290 pF.
3. The digital temperature control meter of claim 1, wherein the power module further comprises a third diode, an anode of the third diode is connected to one end of the second resistor, and a cathode of the third diode is connected to a collector of the second transistor.
4. The digital temperature control gauge of claim 3, wherein the third diode is type S-822T.
5. The digital temperature control table of any of claims 1-4, wherein the first transistor is an NPN transistor.
6. The digital temperature control table according to any of claims 1 to 4, wherein the second transistor is an NPN transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922095426.0U CN210776344U (en) | 2019-11-27 | 2019-11-27 | Digital temperature control meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922095426.0U CN210776344U (en) | 2019-11-27 | 2019-11-27 | Digital temperature control meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210776344U true CN210776344U (en) | 2020-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922095426.0U Active CN210776344U (en) | 2019-11-27 | 2019-11-27 | Digital temperature control meter |
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| CN (1) | CN210776344U (en) |
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2019
- 2019-11-27 CN CN201922095426.0U patent/CN210776344U/en active Active
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