CN210725359U - Constant temperature heating circuit - Google Patents
Constant temperature heating circuit Download PDFInfo
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- CN210725359U CN210725359U CN201920992001.7U CN201920992001U CN210725359U CN 210725359 U CN210725359 U CN 210725359U CN 201920992001 U CN201920992001 U CN 201920992001U CN 210725359 U CN210725359 U CN 210725359U
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- temperature
- state relay
- constant temperature
- leakage protector
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Abstract
The utility model discloses a constant temperature heating circuit, which comprises a leakage protector, a temperature controller, a solid state relay, a thermocouple and a heating plate, wherein, the power end of the temperature controller is connected with commercial power after passing through the leakage protector, and the SSR control signal output end of the temperature controller is connected with the SSR control signal input end of the solid state relay; one output end of the solid-state relay is connected to the mains supply after passing through the leakage protector, and the other output end of the solid-state relay is connected with one power supply end of the heating plate; the other power end of the heating plate is connected to the mains supply after passing through the leakage protector; the thermocouple is used for detecting the temperature of the heating plate and sending a temperature signal to the temperature controller. The utility model discloses a constant temperature heating circuit uses through temperature controller, solid state relay and thermocouple cooperation, samples the temperature is automatic to instant monitoring can improve the temperature regulation precision.
Description
Technical Field
The embodiment of the utility model relates to a circuit structure particularly, relates to a constant temperature heating circuit.
Background
The constant temperature heating table is an important auxiliary device in the field of electronic processing and manufacturing, particularly in the surface mounting technology, and is common equipment in the fields of biology, heredity, medical health, environmental protection, teaching and the like.
In the patent application No. 2014103420156, entitled thermostatic heating plate and laboratory bench, a heating circuit is disclosed, which includes a thermistor RT, a sliding resistor RP and fixed resistors R1 and R2 to form a dc single-arm bridge, and the resistance value of the sliding resistor RP is set to a fixed resistance value according to a preset temperature range of 32-38 ℃. When the temperature of the aluminum heat-conducting shell 31 decreases, the resistance value of the thermistor RT changes, so that the difference between the resistance values of the thermistor RT and the sliding resistor RP gradually increases, the output voltage of the bridge, i.e., the input voltage of the high-resistance operational amplifier LF, gradually increases, and the high-resistance operational amplifier LF amplifies the input voltage. When the temperature of the aluminum heat conducting shell 31 is reduced to a certain value, and the voltage amplified by the high-resistance operational amplifier LF reaches the breakdown voltage of the zener diode ZD, the zener diode ZD is turned on, at this time, the light emitting diode LED is turned on to emit light, and at the same time, the collector and emitter of the power transistor Q are turned on, and the power resistor R4 starts to heat. As the temperature of the aluminum heat-conducting casing 31 rises, the resistance value of the thermistor RT gradually decreases, the difference between the resistance values of the thermistor RT and the sliding resistor RP gradually decreases, and the output voltage of the bridge, i.e., the input voltage of the high-resistance operational amplifier LF gradually decreases. When the temperature of the aluminum heat conducting shell 31 rises to a certain value, the voltage value amplified by the high-resistance operational amplifier LF is smaller than the breakdown voltage of the zener diode ZD, the zener diode ZD is turned off, the light emitting diode LED is turned off, the collector and the emitter of the power triode Q are disconnected, and the power resistor R4 stops heating.
Through analysis, the heating circuit disclosed by the invention patent application controls the temperature through the sliding resistor RP, and the practice shows that the temperature is not accurately adjusted due to the fact that the resistance value of the sliding resistor RP is artificially adjusted.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an adjust accurate constant temperature heating circuit to the above-mentioned defect among the prior art.
In order to realize the purpose of the utility model, the utility model adopts the following technical scheme: a constant temperature heating circuit comprises a leakage protector, a temperature controller, a solid state relay, a thermocouple and a heating plate, wherein a power supply end of the temperature controller is connected to mains supply after passing through the leakage protector, and an SSR control signal output end of the temperature controller is connected with an SSR control signal input end of the solid state relay; one output end of the solid-state relay is connected to the mains supply after passing through the leakage protector, and the other output end of the solid-state relay is connected with one power supply end of the heating plate; the other power end of the heating plate is connected to the mains supply after passing through the leakage protector; the thermocouple is used for detecting the temperature of the heating plate and sending a temperature signal to the temperature controller.
Furthermore, the utility model discloses still provide following subsidiary technical scheme:
the constant temperature heating circuit further comprises a time relay and a buzzer, the power end of the time relay is connected with the mains supply after passing through the leakage protector, one power end of the buzzer is connected with the mains supply after passing through the leakage protector, and the other power end of the buzzer is connected with the output end of the time relay.
The time relay is of an electrified delay type.
The constant temperature heating circuit also comprises a cooling fan, and the cooling fan and the heating plate are mutually connected in parallel.
The power end of the temperature controller is connected in series with a power switch and a power indicator lamp.
One output end of the solid-state relay is connected with a heating switch and a heating indicator lamp in series.
The model of the temperature controller is CH 102.
The solid-state relay is a normally open type single-phase alternating current solid-state relay.
The solid state relay is model number ZYG-D4820.
The thermocouple is model number WRNT-291.
Compared with the prior art, the utility model discloses a constant temperature heating circuit includes earth-leakage protector, temperature controller, solid state relay, thermocouple and hot plate, and wherein, earth-leakage protector inserts live wire and zero line for overload and short-circuit protection, the thermocouple detects the temperature of hot plate and gives the temperature controller with temperature signal, temperature controller re-control solid state relay, solid state relay control hot plate, finally realize the temperature control of hot plate. The utility model discloses a constant temperature heating circuit uses through temperature controller, solid state relay and thermocouple cooperation, samples the temperature is automatic to instant monitoring can improve the temperature regulation precision.
Drawings
In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments or related technologies will be briefly introduced below, and it is obvious that the drawings in the following description only relate to some embodiments of the present invention and are not limiting to the present invention.
Fig. 1 is a circuit diagram of a constant temperature heating circuit according to a preferred embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the following detailed description of the present invention, taken in conjunction with the accompanying drawings and the detailed description, is given in a non-limiting manner.
Referring to fig. 1, the constant temperature heating circuit includes a leakage protector 1, a temperature controller 2, a solid state relay 3, a thermocouple 4, a heating plate 5, a cooling fan 6, a time relay 7 and a buzzer 8.
The earth leakage protector 1 is used for overload and short-circuit protection. In this embodiment, the leakage protector 1 is a miniature circuit breaker of ABB brand model S203-D32, which includes an L input terminal, an L output terminal, an N input terminal and an N output terminal, wherein the L input terminal is connected to the live wire, and the N input terminal is connected to the zero wire.
The temperature controller 2 is used for sending a switch command and controlling the operation of the solid-state relay 3 and the heating plate 5 to achieve the ideal temperature. In this embodiment, the model of the temperature controller 2 is CH102, the 1 st pin thereof is connected with the L output terminal of the earth leakage protector 1, the 2 nd pin thereof is connected with the N output terminal of the earth leakage protector 1, and the 1 st and 2 nd pins are power supply terminals and are connected to the commercial power after passing through the earth leakage protector 1. A power switch S1 and a power indicator L1 are connected in series to a circuit between the 1 st pin of the temperature controller 2 and the L output terminal of the earth leakage protector 1. The 11 th pin and the 12 th pin of the temperature controller 2 are respectively connected with a thermocouple 4, the thermocouple 4 is used for detecting the temperature of the heating plate 5, generating a temperature signal and sending the temperature signal to the temperature controller 2, and the temperature controller 2 generates physical deformation in the switch according to the change of the temperature signal sent by the thermocouple 4 and sends a switch command. In this embodiment, the thermocouple is of the type WRNT-291.
The solid relay 3 is used for receiving a switch command sent by the temperature controller 2 and controlling the on-off of the power supply of the heating plate 5 so as to achieve an ideal temperature. In the present embodiment, the solid-state relay 3 is a normally open single-phase ac solid-state relay, and is selected from models ZYG-D4820. The 3 rd pin of the solid-state relay 3 is connected with the 7 th pin of the temperature controller 2, the 4 th pin of the solid-state relay 3 is connected with the 3 rd pin of the temperature controller 2, the 3 rd and 4 th pins of the solid-state relay 3 are SSR control signal input ends respectively, and the 7 th and 3 rd pins of the temperature controller 2 are SSR control signal output ends. The 1 st pin of solid-state relay 3 is connected with one of them power end of hot plate 5, and the 2 nd pin of solid-state relay 3 is connected with the L output of earth-leakage protector 1. A heating switch S2 and a heating indicator lamp L2 are also connected in series on the circuit between the No. 2 pin of the solid-state relay 3 and the L output end of the earth leakage protector 1. The other power end of the heating plate 5 is connected with the N output end of the leakage protector 1. When the pins 3 and 4 of the solid-state relay 3 receive the control signal and the heating switch S2 is closed, the pins 1 and 2 of the solid-state relay 3 are closed, the power supply of the heating plate 5 is turned on, and heating is started.
The cooling fan 6 is used for cooling the leakage protector 1, the temperature controller 2, the solid-state relay 3, the time relay 7 and the buzzer 8. One power end of the cooling fan 6 is connected with the N output end of the earth leakage protector 1, and the other power end is connected with the 1 st pin of the solid-state relay 3, that is, the cooling fan 6 and the heating plate 5 are connected in parallel.
The time relay 7 and the buzzer 8 are used for calculating the heating time and playing a timing alarm role. In the embodiment, the time relay 7 is of an electrified delay type, and the selected type is AH 3-3. The 7 th pin and the 8 th pin of the time relay 7 are respectively connected with the L output end of the earth leakage protector 1, the 2 nd pin of the time relay 7 is connected with the N output end of the earth leakage protector 1, the 6 th pin of the time relay 7 is connected with one of the power supply ends of the buzzer 8, and the other power supply end of the buzzer 8 is connected with the N output end of the earth leakage protector 1. After the timing time of the time relay 7 is over, the 8 th pin and the 6 th pin are connected, the two power ends of the buzzer 8 are connected with the commercial power, and an alarm sound is sent out to remind the user.
The working process of the constant temperature heating circuit of the embodiment is as follows: powering up; the power switch S1 and the heating switch S2 are closed, and the earth leakage protector 1, the temperature controller 2, the solid relay 3, the thermocouple 4, the heating plate 5, the cooling fan 6, the time relay 7 and the buzzer 8 are electrified to start working; adjusting the timing time of the time relay 7; setting a constant temperature through the temperature controller 2, and sending a control signal to the solid-state relay 3 by the temperature controller 2; the heating plate 5 is continuously heated, and the thermocouple 4 detects the temperature of the heating plate 5 in real time; when the temperature of the heating plate 5 reaches a set value, the temperature controller 2 stops sending a control signal to the solid-state relay 3, the heating plate 5 loses power, and the temperature rise is stopped; when the temperature of the heating plate 5 is lower than a set value, the temperature controller 2 starts to send a control signal to the solid-state relay 3, the heating plate 5 is electrified and starts to heat up, and therefore the constant temperature state in a certain range can be kept; after the timing time of the time relay 7 is over, the buzzer 8 gives out an alarm sound to remind a user, and the work within too long time is avoided. Because the thermocouple 4 temperature measurement is sensitive, and the temperature controller 2 accuse temperature is sensitive, and 3 actions of solid state relay are sensitive, have avoided the error of artificial regulation, can realize that the accuse temperature is accurate, adjusts the temperature accurately.
It should be noted that the above-mentioned preferred embodiments are only for illustrating the technical concepts and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention accordingly, and the protection scope of the present invention cannot be limited thereby. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (10)
1. A constant temperature heating circuit, characterized in that: comprises a leakage protector, a temperature controller, a solid relay, a thermocouple and a heating plate, wherein,
the power supply end of the temperature controller is connected to commercial power after passing through the leakage protector, and the SSR control signal output end of the temperature controller is connected with the SSR control signal input end of the solid-state relay;
one output end of the solid-state relay is connected to the mains supply after passing through the leakage protector, and the other output end of the solid-state relay is connected with one power supply end of the heating plate;
the other power end of the heating plate is connected to the mains supply after passing through the leakage protector;
the thermocouple is used for detecting the temperature of the heating plate and sending a temperature signal to the temperature controller.
2. The constant temperature heating circuit according to claim 1, wherein: the power supply end of the time relay is connected with the commercial power after passing through the leakage protector, one power supply end of the buzzer is connected with the commercial power after passing through the leakage protector, and the other power supply end of the buzzer is connected with the output end of the time relay.
3. The constant temperature heating circuit according to claim 2, wherein: the time relay is of an electrified delay type.
4. The constant temperature heating circuit according to claim 1, wherein: the heating plate is connected with the heating plate in parallel.
5. The constant temperature heating circuit according to claim 1, wherein: and a power switch and a power indicator lamp are connected in series with the power end of the temperature controller.
6. The constant temperature heating circuit according to claim 1, wherein: and a heating switch and a heating indicator lamp are connected in series on one output end of the solid-state relay.
7. The constant temperature heating circuit according to claim 1, wherein: the model of the temperature controller is CH 102.
8. The constant temperature heating circuit according to claim 1, wherein: the solid-state relay is a normally open type single-phase alternating current solid-state relay.
9. The constant temperature heating circuit according to claim 8, wherein: the model of the solid-state relay is ZYG-D4820.
10. The constant temperature heating circuit according to claim 1, wherein: the model of the thermocouple is WRNT-291.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920992001.7U CN210725359U (en) | 2019-06-28 | 2019-06-28 | Constant temperature heating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920992001.7U CN210725359U (en) | 2019-06-28 | 2019-06-28 | Constant temperature heating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210725359U true CN210725359U (en) | 2020-06-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920992001.7U Expired - Fee Related CN210725359U (en) | 2019-06-28 | 2019-06-28 | Constant temperature heating circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210725359U (en) |
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2019
- 2019-06-28 CN CN201920992001.7U patent/CN210725359U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200609 Termination date: 20210628 |
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| CF01 | Termination of patent right due to non-payment of annual fee |