CN202887024U - Thermal control circuit with high temperature alarm function - Google Patents
Thermal control circuit with high temperature alarm function Download PDFInfo
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- CN202887024U CN202887024U CN 201220465393 CN201220465393U CN202887024U CN 202887024 U CN202887024 U CN 202887024U CN 201220465393 CN201220465393 CN 201220465393 CN 201220465393 U CN201220465393 U CN 201220465393U CN 202887024 U CN202887024 U CN 202887024U
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Abstract
The utility model discloses a thermal control circuit with a high temperature alarm function, comprising a high temperature alarm circuit, a temperature measurement bridge circuit, a comparison amplification circuit, a following circuit and a constant current source. The output terminal of the temperature measurement bridge circuit is connected with the input terminal of the comparison amplification circuit; the output terminal of the comparison amplification circuit is connected with the input terminal of the following circuit; the comparison amplification circuit is in series with the following circuit through a second resistor R29; the output terminal of the following circuit is connected with the constant current source; and the following circuit is in series with the constant current source through a third resistor R30. According to the technology scheme provided in the utility model, the thermal control circuit with a high temperature alarm function is advantageous in that the structure is simple, the number of employed components is small, no interference is generated to the exterior, the temperature control precision is high, etc., and the thermal control circuit with a high temperature alarm function can be widely applied in the fields such as electronics, communication and medical fields.
Description
Technical field
The utility model relates to circuit field, in particular to a kind of temperature control circuit with the high temperature alarm function.
Background technology
The general more complicated of temperature control circuit in the prior art, energy consumption are high, regulation and control sensitivity is low, and adopt exchanges temperature controls more, even if use direct temperature control, also be to adopt pulse direct current, direct current is carried out frequency modulation or amplitude modulation, and sort circuit is not only complicated, and very large to controlled device and external interference.
The utility model content
The purpose of this utility model is to overcome the above problem that prior art exists, and a kind of temperature control circuit with the high temperature alarm function is provided.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the utility model is achieved through the following technical solutions:
A kind of temperature control circuit with the high temperature alarm function, comprise high temperature alarm circuit, the thermometric bridge circuit, compare amplifying circuit, follow circuit and constant current source, the output terminal of described thermometric bridge circuit is connected with the described relatively input end of amplifying circuit, the described relatively output terminal of amplifying circuit is connected with the input end of described follow circuit, also connect by the second resistance R 29 between described relatively amplifying circuit and the described follow circuit, the output terminal of described follow circuit is connected with described constant current source, connects by the 3rd resistance R 30 between described follow circuit and the constant current source.
Further, described thermometric bridge circuit is comprised of three resistance, a slide rheostat and an electric capacity, described thermometric bridge circuit is connected with thermistor, the 7th resistance R 34, the 8th resistance R 35, the 9th resistance R 36, the first slide rheostat RP3 serial connection, described the 7th resistance R 34 and the 8th resistance R 35 are connected on the supply voltage, described thermometric bridge circuit ground connection.
Further, described relatively amplifying circuit is comprised of a resistance, two electric capacity and an operational amplifier, and 2 pin of operational amplifier U19A are connected on the 8th resistance R 35 place wires, and 3 pin are connected on the 7th resistance R 34 place wires; The 7th capacitor C 30 1 terminates on the described supply voltage, an end ground connection; 8 pin of described operational amplifier U19A are connected on the supply voltage and 4 pin ground connection, are parallel with the first resistance R 28 and the second capacitor C 22 on the described operational amplifier U19A.
Further, described follow circuit is comprised of an operational amplifier, and 5 pin of operational amplifier U19B link to each other with the second resistance R 29 and 6 pin are connected on 7 pin by a wire, and 8 pin of described arithmetical unit U19B link to each other with supply voltage, 4 pin ground connection.
Further, described constant current source is by two resistance, four electric capacity, operational amplifier, triode and become by the temperature control set of devices, 3 pin of operational amplifier U20A are connected with the 3rd resistance R 30 and are connected to the 3rd capacitor C 23 at the wire that links to each other, an end ground connection of described the 3rd capacitor C 23; 4 pin ground connection and 8 pin of described operational amplifier U20A are connected with supply voltage, on 2 pin of described operational amplifier U20A and 1 pin and be connected to the 4th capacitor C 24, described operational amplifier U20A is connected with the 4th resistance R 31 and is connected to the 5th capacitor C 25 at the wire that links to each other, one end ground connection of described the 5th capacitor C 25, described the 4th resistance R 31 links to each other with 2 pin of the first triode Q6,3 pin of described the first triode Q6 link to each other with supply voltage and are connected to the 6th capacitor C 26 at the wire that links to each other, one end ground connection of described the 6th capacitor C 26,1 pin of described the first triode Q6 is connected by the temperature control device with described, and is connected to the 5th resistance R 32 described between by temperature control device and described the 4th capacitor C 24.
Further, described high temperature alarm circuit is by a resistance, a slide rheostat, an electric capacity, an operational amplifier, a diode and a triode form, 5 pin of operational amplifier U20B are connected with the second slide rheostat RP4, the termination power voltage other end ground connection of described the second slide rheostat RP4,6 pin of described operational amplifier U20B are connected with the end that described the first slide rheostat RP3 is connected with thermistor, 8 pin of described operational amplifier U20B are connected on the supply voltage and at the wire that links to each other and are connected to the 8th capacitor C 33, one end ground connection of described the 8th capacitor C 33, the 4 pin ground connection of described operational amplifier U20B, 7 pin of described operational amplifier U20B are connected with 2 pin of the second triode Q7A, 3 pin of described the second triode Q7A and diode D6, one termination power voltage of the 6th resistance R 33 serial connections and the 6th resistance R 33, the 1 pin ground connection of described the second triode Q7A.
Further, described operational amplifier U19A and U19B are two groups of circuit of a device, and this device one has eight pin, 1,2,3rd, U19A, 5,6, the 7th, U19B, 4 pin ground connection wherein, 8 pin connect power supply, and same U20A and U20B are two groups of circuit of a device, this device one has eight pin, 1,2, the 3rd, U20A, 5,6, the 7th, U20B, 4 pin ground connection wherein, 8 pin connect power supply.
Further, the variation of described thermometric bridge measurement temperature, be electric signal with the change transitions of temperature, export described the first operational amplifier U19A to and amplify processing, enter follower through the described relatively output terminal of amplifying circuit again, enter described constant current source after following processing, drive describedly by the temperature control device, describedly fed back to described constant current source after being changed by the temperature control device temperature.
Further, thermistor NTC in the described thermometric bridge circuit is with by the temperature variation of temperature control device change in resistance being occured, the second slide rheostat RP4 in the described high temperature alarm circuit is preset in the resistance of a fixed temperature, when described thermistor temp raises, resistance descends, the magnitude of voltage that inputs to described four-operational amplifier U20B negative terminal descends, when dropping to when being lower than the positive terminal voltage of described four-operational amplifier U20B, namely surpass preset temperature, this moment four-operational amplifier U20B and described the second triode Q7A work thereafter, the LED lamp that links to each other with described the second triode Q7A collector is lighted, the function that reaches a high temperature and report to the police.
The beneficial effects of the utility model are:
Adopt technical solutions of the utility model, simple in structure, use that components and parts are less, externally noiseless and temperature-controlled precision can be widely used in the fields such as electronics, communication, medical treatment than advantages of higher.
Above-mentioned explanation only is the general introduction of technical solutions of the utility model, for can clearer understanding technological means of the present utility model, and can be implemented according to the content of instructions, below with preferred embodiment of the present utility model and cooperate accompanying drawing to be described in detail as follows.Embodiment of the present utility model is provided in detail by following examples and accompanying drawing thereof.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, consists of the application's a part, and illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not consist of improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the utility model schematic diagram;
Fig. 2 is the framework synoptic diagram.
Number in the figure explanation: 1, high temperature alarm circuit, 2, the thermometric bridge circuit, 3, amplifying circuit relatively, 4, follow circuit, 5, constant current source, 6, by the temperature control device.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the utility model in detail.
With reference to shown in Figure 1, a kind of temperature control circuit with the high temperature alarm function, comprise high temperature alarm circuit 1, thermometric bridge circuit 2, compare amplifying circuit 3, follow circuit 4 and constant current source 5, the output terminal of described thermometric bridge circuit 2 is connected with the described relatively input end of amplifying circuit 3, the described relatively output terminal of amplifying circuit 3 is connected with the input end of described follow circuit 4, also connect by the second resistance R 29 between described relatively amplifying circuit 3 and the follow circuit 4, the output terminal of described follow circuit 4 is connected with described constant current source 5, connects by the 3rd resistance R 30 between described follow circuit and the constant current source.
Further, described thermometric bridge circuit 2 is comprised of three resistance, a slide rheostat and an electric capacity, described thermometric bridge circuit 2 is connected with thermistor, the 7th resistance R 34, the 8th resistance R 35, the 9th resistance R 36, the first slide rheostat RP3 serial connection, described the 7th resistance R 34 and the 8th resistance R 35 are connected on the supply voltage, described thermometric bridge circuit 2 ground connection.
Further, described relatively amplifying circuit 3 is comprised of a resistance, two electric capacity and an operational amplifier, and 2 pin of operational amplifier U19A are connected on the 8th resistance R 35 place wires, and 3 pin are connected on the 7th resistance R 34 place wires; The 7th capacitor C 30 1 terminates on the described supply voltage, an end ground connection; 8 pin of described operational amplifier U19A are connected on the supply voltage and 4 pin ground connection, are parallel with the first resistance R 28 and the second capacitor C 22 on the described operational amplifier U19A.
Further, described follow circuit 4 is comprised of an operational amplifier, and 5 pin of operational amplifier U19B link to each other with the second resistance R 29 and 6 pin are connected on 7 pin by a wire, and 8 pin of described arithmetical unit U19B link to each other with supply voltage, 4 pin ground connection.
Further, described constant current source 5 is by two resistance, four electric capacity, operational amplifier, triode and become by the temperature control set of devices, 3 pin of operational amplifier U20A are connected with the 3rd resistance R 30 and are connected to the 3rd capacitor C 23 at the wire that links to each other, an end ground connection of described the 3rd capacitor C 23; 4 pin ground connection and 8 pin of described operational amplifier U20A are connected with supply voltage, on 2 pin of described operational amplifier U20A and 1 pin and be connected to the 4th capacitor C 24, described operational amplifier U20A is connected with the 4th resistance R 31 and is connected to the 5th capacitor C 25 at the wire that links to each other, one end ground connection of described the 5th capacitor C 25, described the 4th resistance R 31 links to each other with 2 pin of the first triode Q6,3 pin of described the first triode Q6 link to each other with supply voltage and are connected to the 6th capacitor C 26 at the wire that links to each other, one end ground connection of described the 6th capacitor C 26,1 pin of described the first triode Q6 is connected by temperature control device 6 with described, and is connected to the 5th resistance R 32 described between by temperature control device 6 and described the 4th capacitor C 24.
Further, described high temperature alarm circuit 1 is by a resistance, a slide rheostat, an electric capacity, an operational amplifier, a diode and a triode form, 5 pin of operational amplifier U20B are connected with the second slide rheostat RP4, the termination power voltage other end ground connection of described the second slide rheostat RP4,6 pin of described operational amplifier U20B are connected with the end that described the first slide rheostat RP3 is connected with thermistor, 8 pin of described operational amplifier U20B are connected on the supply voltage and at the wire that links to each other and are connected to the 8th capacitor C 33, one end ground connection of described the 8th capacitor C 33, the 4 pin ground connection of described operational amplifier U20B, 7 pin of described operational amplifier U20B are connected with 2 pin of the second triode Q7A, 3 pin of described the second triode Q7A and diode D6, one termination power voltage of the 6th resistance R 33 serial connections and the 6th resistance R 33, the 1 pin ground connection of described the second triode Q7A.
Further, described operational amplifier U19A and U19B are two groups of circuit of a device, and this device one has eight pin, 1,2,3rd, U19A, 5,6, the 7th, U19B, 4 pin ground connection wherein, 8 pin connect power supply, and same U20A and U20B are two groups of circuit of a device, this device one has eight pin, 1,2, the 3rd, U20A, 5,6, the 7th, U20B, 4 pin ground connection wherein, 8 pin connect power supply.
Further, the variation that described thermometric bridge circuit 2 is measured temperature, be electric signal with the change transitions of temperature, export described the first operational amplifier U19A to and amplify processing, enter follower through the described relatively output terminal of amplifying circuit 3 again, enter described constant current source 5 after following processing, drive describedly by temperature control device 6, describedly fed back to described constant current source 5 after temperature control device 6 temperature variation.
Further, thermistor NTC in the described thermometric bridge circuit 2 is with by the temperature variation of temperature control device 6 change in resistance being occured, the second slide rheostat RP4 of 1 li of described high temperature alarm circuit is preset in the resistance of a fixed temperature, when described thermistor temp raises, resistance descends, the magnitude of voltage that inputs to described four-operational amplifier U20B negative terminal descends, when dropping to when being lower than the positive terminal voltage of described four-operational amplifier U20B, namely surpass preset temperature, this moment four-operational amplifier U20B and described the second triode Q7A work thereafter, the LED lamp that links to each other with described the second triode Q7A collector is lighted, the function that reaches a high temperature and report to the police.
The above is preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (9)
1. temperature control circuit with the high temperature alarm function, comprise high temperature alarm circuit (1), thermometric bridge circuit (2), compare amplifying circuit (3), follow circuit (4) and constant current source (5), the output terminal of described thermometric bridge circuit (2) is connected with the described relatively input end of amplifying circuit (3), the described relatively output terminal of amplifying circuit (3) is connected with the input end of described follow circuit (4), also connect by the second resistance R 29 between described relatively amplifying circuit (3) and the described follow circuit (4), the output terminal of described follow circuit (4) is connected with described constant current source (5), connects by the 3rd resistance R 30 between described follow circuit (4) and the described constant current source (5).
2. the temperature control circuit with the high temperature alarm function according to claim 1, it is characterized in that: described thermometric bridge circuit (2) is comprised of three resistance, a slide rheostat and an electric capacity, described thermometric bridge circuit (2) is connected with thermistor, the 7th resistance R 34, the 8th resistance R 35, the 9th resistance R 36, the first slide rheostat RP3 serial connection, described the 7th resistance R 34 and the 8th resistance R 35 are connected on the supply voltage, described thermometric bridge circuit (2) ground connection.
3. the temperature control circuit with the high temperature alarm function according to claim 1, it is characterized in that: described relatively amplifying circuit (3) is comprised of a resistance, two electric capacity and an operational amplifier, 2 pin of operational amplifier U19A are connected on the 8th resistance R 35 place wires, and 3 pin are connected on the 7th resistance R 34 place wires; The 7th capacitor C 30 1 terminates on the described supply voltage, an end ground connection; 8 pin of described operational amplifier U19A are connected on the supply voltage and 4 pin ground connection, are parallel with the first resistance R 28 and the second capacitor C 22 on the described operational amplifier U19A.
4. the temperature control circuit with the high temperature alarm function according to claim 3, it is characterized in that: described follow circuit (4) is comprised of an operational amplifier, 5 pin of operational amplifier U19B link to each other with the second resistance R 29 and 6 pin are connected on 7 pin by a wire, 8 pin of described arithmetical unit U19B link to each other with supply voltage, 4 pin ground connection.
5. the temperature control circuit with the high temperature alarm function according to claim 1, it is characterized in that: described constant current source (5) is by two resistance, four electric capacity, operational amplifier, triode and become by the temperature control set of devices, 3 pin of operational amplifier U20A are connected with the 3rd resistance R 30 and are connected to the 3rd capacitor C 23 at the wire that links to each other, an end ground connection of described the 3rd capacitor C 23; 4 pin ground connection and 8 pin of described operational amplifier U20A are connected with supply voltage, on 2 pin of described operational amplifier U20A and 1 pin and be connected to the 4th capacitor C 24, described operational amplifier U20A is connected with the 4th resistance R 31 and is connected to the 5th capacitor C 25 at the wire that links to each other, one end ground connection of described the 5th capacitor C 25, described the 4th resistance R 31 links to each other with 2 pin of the first triode Q6,3 pin of described the first triode Q6 link to each other with supply voltage and are connected to the 6th capacitor C 26 at the wire that links to each other, one end ground connection of described the 6th capacitor C 26,1 pin of described the first triode Q6 is connected by temperature control device (6) with described, and is connected to the 5th resistance R 32 described between by temperature control device (6) and described the 4th capacitor C 24.
6. the temperature control circuit with the high temperature alarm function according to claim 1, it is characterized in that: described high temperature alarm circuit (1) is by a resistance, a slide rheostat, an electric capacity, an operational amplifier, a diode and a triode form, 5 pin of operational amplifier U20B are connected with the second slide rheostat RP4, the termination power voltage other end ground connection of described the second slide rheostat RP4,6 pin of described operational amplifier U20B are connected with the end that described the first slide rheostat RP3 is connected with thermistor, 8 pin of described operational amplifier U20B are connected on the supply voltage and at the wire that links to each other and are connected to the 8th capacitor C 33, one end ground connection of described the 8th capacitor C 33, the 4 pin ground connection of described operational amplifier U20B, 7 pin of described operational amplifier U20B are connected with 2 pin of the second triode Q7A, 3 pin of described the second triode Q7A and diode D6, one termination power voltage of the 6th resistance R 33 serial connections and the 6th resistance R 33, the 1 pin ground connection of described the second triode Q7A.
7. according to claim 3 or 4 described temperature control circuits with the high temperature alarm function, it is characterized in that: described operational amplifier U19A and U19B are two groups of circuit of a device, and this device one has eight pin, 1,2,3rd, U19A, 5,6, the 7th, U19B, 4 pin ground connection wherein, 8 pin connect power supply, and same U20A and U20B are two groups of circuit of a device, this device one has eight pin, 1,2, the 3rd, U20A, 5,6, the 7th, U20B, 4 pin ground connection wherein, 8 pin connect power supply.
8. according to claim 1 and 2 or 3 or 4 or 5 described temperature control circuits with the high temperature alarm function, it is characterized in that: described thermometric bridge circuit (2) is measured the variation of temperature, be electric signal with the change transitions of temperature, export described the first operational amplifier U19A to and amplify processing, enter follower through the described relatively output terminal of amplifying circuit (3) again, enter described constant current source (5) after following processing, drive describedly by temperature control device (6), describedly fed back to described constant current source (5) after temperature control device (6) temperature variation.
9. according to claim 1 or 6 described temperature control circuits with the high temperature alarm function, it is characterized in that: the thermistor NTC in the described thermometric bridge circuit (2) is with by the temperature variation of temperature control device (6) change in resistance being occured, the second slide rheostat RP4 that described high temperature alarm circuit (1) is inner is preset in the resistance of a fixed temperature, when described thermistor temp raises, resistance descends, the magnitude of voltage that inputs to described four-operational amplifier U20B negative terminal descends, when dropping to when being lower than the positive terminal voltage of described four-operational amplifier U20B, namely surpass preset temperature, this moment four-operational amplifier U20B and described the second triode Q7A work thereafter, the LED lamp that links to each other with described the second triode Q7A collector is lighted, the function that reaches a high temperature and report to the police.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220465393 CN202887024U (en) | 2012-09-13 | 2012-09-13 | Thermal control circuit with high temperature alarm function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220465393 CN202887024U (en) | 2012-09-13 | 2012-09-13 | Thermal control circuit with high temperature alarm function |
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| Publication Number | Publication Date |
|---|---|
| CN202887024U true CN202887024U (en) | 2013-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220465393 Expired - Fee Related CN202887024U (en) | 2012-09-13 | 2012-09-13 | Thermal control circuit with high temperature alarm function |
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| Country | Link |
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| CN (1) | CN202887024U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103385294A (en) * | 2013-06-29 | 2013-11-13 | 苏州吉康电子科技有限公司 | Constant temperature sour milk fermentation case |
| CN103792983A (en) * | 2014-01-15 | 2014-05-14 | 中国科学院苏州生物医学工程技术研究所 | Current adjustable and limitable circuit with sudden stop and slow starting functions |
-
2012
- 2012-09-13 CN CN 201220465393 patent/CN202887024U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103385294A (en) * | 2013-06-29 | 2013-11-13 | 苏州吉康电子科技有限公司 | Constant temperature sour milk fermentation case |
| CN103792983A (en) * | 2014-01-15 | 2014-05-14 | 中国科学院苏州生物医学工程技术研究所 | Current adjustable and limitable circuit with sudden stop and slow starting functions |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130417 Termination date: 20180913 |