CN211403266U - Constant temperature control circuit based on baking equipment - Google Patents
Constant temperature control circuit based on baking equipment Download PDFInfo
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- CN211403266U CN211403266U CN202020313122.7U CN202020313122U CN211403266U CN 211403266 U CN211403266 U CN 211403266U CN 202020313122 U CN202020313122 U CN 202020313122U CN 211403266 U CN211403266 U CN 211403266U
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Abstract
The utility model discloses a constant temperature control circuit based on baking equipment, it includes constant temperature control circuit, constant temperature control circuit include zero cross detection circuit, go up thermistor detection circuit, control module down, the live wire end of being connected with alternating current power supply, zero line end, parallelly connect in the heating pipe control circuit between live wire end and zero line end, heating pipe control circuit includes heating pipe control circuit and heating pipe control circuit down. The utility model discloses can the real-time detection temperature variation to through real-time change heating coefficient, generate heat so that the temperature more tends the user to set for about controlling respectively, in order to reach the purpose of accurate accuse temperature.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to an electric toothbrush technical field, it is specific, relate to a constant temperature control circuit based on baking equipment.
[ background of the invention ]
The oven is a sealed electric appliance for baking food or drying products, and is divided into a household electric appliance and an industrial oven, and the household oven can be used for processing some wheaten foods, such as an oven, a bread maker and the like.
At present, an oven and a bread maker are necessary for kitchens in western food countries such as Europe and America, a relay control mode is adopted in the heating process of the traditional oven and bread maker, the relay cannot be frequently switched on and off, the service life is short, the phenomenon of uneven vertical heating of food exists when the control mode is used for heating, and the baked food is not ideal; or, the phenomena of temperature overshoot, overhigh temperature and uneven heating in the bread fermentation process exist, the dough fermentation effect is poor, and the bread baked by the bread is uneven inside and outside, which is not ideal.
In addition, the circuit cost of the existing baking oven control is high, and the control circuit does not flexibly adjust the heating device of the baking oven in a larger range.
[ Utility model ] content
The utility model aims at providing a can real-time detection temperature variation to through real-time change heating coefficient, generate heat so that the temperature more tends the user to set for about independent control respectively, in order to reach the thermostatic control circuit based on baking equipment of accurate accuse temperature.
In order to achieve the main purpose, the utility model provides a constant temperature control circuit based on baking equipment comprises a constant temperature control circuit arranged in the baking equipment, the constant temperature control circuit comprises a zero-crossing detection circuit, an upper thermistor detection circuit, a lower thermistor detection circuit, a control module, a live wire end connected with an alternating current power supply, a zero line end, and a heating pipe control circuit connected in parallel between the live wire end and the zero line end, the heating pipe control circuit comprises an upper heating pipe control circuit and a lower heating pipe control circuit which are arranged in the baking equipment in a distributed manner, the input end of the zero-crossing detection circuit is connected between the live wire end and the zero line end, the output end of the zero-crossing detection circuit is connected to the interrupt input end of the control module, the input ends of the upper thermistor detection circuit and the lower thermistor detection circuit respectively detect temperature signals changing along with the temperature in the baking equipment, the output ends of the upper thermistor detection circuit and the lower thermistor detection circuit are respectively connected to the input end of the control module, and the control module outputs PWM signals to the upper heating pipe control circuit and the lower heating pipe control circuit according to temperature signals detected by the upper thermistor detection circuit and the lower thermistor detection circuit so as to control the upper heating pipe control circuit and the lower heating pipe control circuit to carry out power output.
The control module comprises a control chip and an analog-to-digital conversion circuit arranged in the control chip.
According to a further scheme, the upper thermistor detection circuit comprises a first thermistor, the lower thermistor detection circuits comprise second thermistors, and the control chip detects voltage values of the first thermistor and the second thermistor respectively; the analog-to-digital conversion circuit performs A/D conversion on the detected voltage value and then sends the voltage value to the control chip, and the control chip generates PWM signals for controlling the power output of the upper heating tube control circuit and the lower heating tube control circuit according to the voltage value after the A/D conversion.
In a further aspect, the zero-crossing detection circuit includes a first resistor, a first diode, a first photocoupler, a first transistor, and a first capacitor, a first end of the first resistor is connected to the live wire end, a second end of the first resistor is connected to a first input end of the first photocoupler, an anode of the first diode is connected between the zero line end and a second output end of the first photocoupler, a cathode of the first diode is connected to a first input end of the first photocoupler, a second resistor is connected between a first output end of the first photocoupler and a base of the first transistor, a second output end of the first photocoupler is connected in series with an emitter of the first transistor and then grounded, and a collector of the first transistor is connected to an interrupt input end of the control module, the first capacitor is connected in parallel between the collector and the emitter of the first transistor.
The upper heating pipe control circuit comprises a second transistor, a second photoelectric coupler and a first heating pipe, wherein the base electrode of the second transistor is electrically connected with the control module, the collector electrode of the second transistor is electrically connected with the first input end of the second photoelectric coupler, and the output end of the second photoelectric coupler is electrically connected with the first heating pipe.
The lower heating pipe control circuit comprises a third transistor, a third photoelectric coupler and a second heating pipe, wherein the base electrode of the third transistor is electrically connected with the control module, the collector electrode of the third transistor is electrically connected with the first input end of the third photoelectric coupler, and the output end of the third photoelectric coupler is electrically connected with the second heating pipe.
In a further scheme, the first heating pipe and the second heating pipe are both bidirectional thyristors.
According to a further scheme, the constant temperature control circuit further comprises an overcurrent protection circuit, an overvoltage protection circuit and an overheat protection circuit, and the overcurrent protection circuit, the overvoltage protection circuit and the overheat protection circuit are electrically connected with the control module respectively.
In a further scheme, the control chip is MC81F 4316.
Therefore, the utility model discloses a constant temperature control circuit is mainly by upper and lower heating pipe control circuit, zero cross detection circuit, upper and lower thermistor detection circuit and control chip constitute, come the temperature sensing through upper and lower two temperature-sensing probe, can obtain the voltage value that corresponds temperature variation, rethread control chip carries out AD conversion and obtains the real-time AD value that corresponds, rethread PID algorithm control silicon controlled rectifier break-make heating, can change the heating coefficient in real time, go to generate heat from top to bottom respectively independent control, solve food about inhomogeneous problem and make the temperature more tend to the user and set for, reach accurate accuse temperature.
In addition, the input power supply is connected with the zero-crossing detection circuit, the zero-crossing detection circuit generates a zero-crossing signal, and the heating pipe control circuit controls the bidirectional thyristor according to the zero-crossing signal, so that the output power of the heating device connected with the heating pipe control circuit is flexibly adjusted in a large range.
[ description of the drawings ]
Fig. 1 is a schematic diagram of an embodiment of a thermostatic control circuit based on a baking device of the present invention.
Fig. 2 is a schematic circuit diagram of a control chip in an embodiment of a thermostatic control circuit based on a baking device.
Fig. 3 is a schematic circuit diagram of a zero-crossing detection circuit in an embodiment of a thermostatic control circuit based on a baking device.
Fig. 4 is a schematic circuit diagram of an upper heating pipe control circuit in an embodiment of a thermostatic control circuit based on a baking device.
Fig. 5 is a schematic circuit diagram of a lower heating pipe control circuit in an embodiment of a thermostatic control circuit based on a baking device of the present invention.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.
Referring to fig. 1, the constant temperature control circuit based on the baking device of the present invention comprises a constant temperature control circuit installed in the baking device, the constant temperature control circuit comprises a zero-crossing detection circuit 11, an upper thermistor detection circuit 12, a lower thermistor detection circuit 13, a control module 10, a fire wire end (L) connected with an ac power supply, a zero wire end (N), and a heating pipe control circuit connected in parallel between the fire wire end and the zero wire end, the heating pipe control circuit comprises an upper heating pipe control circuit 14 and a lower heating pipe control circuit 15 for being distributed and installed in the baking device, an input end of the zero-crossing detection circuit 11 is connected between the fire wire end and the zero wire end, an output end of the zero-crossing detection circuit 11 is connected to an interrupt input end (intro) of the control module 10, an input end of the upper thermistor detection circuit 12 and the lower thermistor detection circuit 13 respectively detect temperature signals varying with the temperature in the baking, the output ends of the upper thermistor detection circuit 12 and the lower thermistor detection circuit 13 are respectively connected to the input end of the control module 10, and the control module 10 outputs a PWM signal to the upper heating tube control circuit 14 and the lower heating tube control circuit 15 according to the temperature signals detected by the upper thermistor detection circuit 12 and the lower thermistor detection circuit 13 to control the upper heating tube control circuit 14 and the lower heating tube control circuit 15 to perform power output.
Referring to fig. 2, the control module 10 includes a control chip U1 and an analog-to-digital conversion circuit built in the control chip U1, the upper thermistor detection circuit 12 includes a first thermistor, the lower thermistor detection circuits 13 each include a second thermistor, and the control chip U1 detects voltage values of the first thermistor and the second thermistor respectively; the analog-to-digital conversion circuit performs A/D conversion on the detected voltage value and then sends the voltage value to the control chip U1, and the control chip U1 generates PWM signals for controlling the power output of the upper heating tube control circuit 14 and the lower heating tube control circuit 15 according to the voltage value after the A/D conversion. Preferably, the control chip U1 is MC81F 4316.
Referring to fig. 3, the zero-cross detection circuit 11 includes a first resistor R1, a first diode D1, a first photocoupler U2, a first transistor Q1, a first capacitor C1, a first end of the first resistor R1 is connected to the live wire end, a second end of the first resistor R1 is connected to a first input end of the first photocoupler U1, an anode of the first diode D1 is connected between the neutral wire end and a second output end of the first photocoupler U1, a cathode of the first diode D1 is connected to a first input end of the first photocoupler U1, a first output end of the first photocoupler U1 and a base of the first transistor Q1 are connected to each other by a second resistor R2, a second output end of the first photocoupler U1 and an emitter of the first transistor Q1 are connected in series and then grounded, a collector of the first transistor Q1 is connected to an interrupt input end of the control module 10, and a collector of the first capacitor C1 is connected in parallel to a collector of the first transistor Q1, Between the emitters. It can be seen that the temperature detected by the thermistor detection circuit is fed back to the control chip U1, and the conduction angle of the transistor and the thyristor is controlled by the zero-crossing detection circuit 11.
Referring to fig. 4, the upper heater pipe control circuit 14 includes a second transistor Q2, a second photocoupler U3, and a first heater pipe TR1, a base of the second transistor Q2 is electrically connected to the control module 10, a collector of the second transistor Q2 is electrically connected to a first input terminal of the second photocoupler U3, and an output terminal of the second photocoupler U3 is electrically connected to the first heater pipe TR 1.
Referring to fig. 5, the lower heater pipe control circuit 15 includes a third transistor Q3, a third photo coupler U4, and a second heater pipe TR2, wherein a base of the third transistor Q3 is electrically connected to the control module 10, a collector of the third transistor Q3 is electrically connected to a first input terminal of the third photo coupler U4, and an output terminal of the third photo coupler U4 is electrically connected to the second heater pipe TR 2.
Preferably, the first heating pipe TR1 and the second heating pipe TR2 are both triacs. Therefore, the heating device is controlled by the silicon controlled component, and the output power of the heating device can be flexibly adjusted in a large range.
Therefore, the upper heating pipe control circuit 14 and the lower heating pipe control circuit 15 which are arranged in the baking device in a distributed mode, the heating pipe control circuits which are the same are arranged in the baking device in an upper and a lower mode, the silicon controlled rectifier is controlled by the zero-crossing signal, the temperature of the upper and the lower heating devices is independently controlled, different modes can be selected for heating different foods, and the program automatically completes the full process control.
In this embodiment, the constant temperature control circuit further includes an overcurrent protection circuit 16, an overvoltage protection circuit 17, and an overheat protection circuit 18, and the overcurrent protection circuit 16, the overvoltage protection circuit 17, and the overheat protection circuit 18 are electrically connected to the control module 10, respectively. It is visible, the utility model discloses possess simultaneously and overflow, multiple safety protection measures such as excessive pressure, overheated.
In practical application, two voltage values which are correspondingly changed are obtained through the resistance value change of the upper thermistor and the lower thermistor, and then the control chip U1 is used for AD conversion to obtain the upper practical AD value and the lower practical AD value. And then, comparing the two obtained actual AD values with the two AD values set by the program, and calculating the heating ratio coefficient by adopting a PID algorithm after determining the difference value between the two actual AD values and the two AD values set by the program.
For example, when the two actual AD values are much larger than the two programmed AD values (the larger the AD value, the lower the temperature, the smaller the AD value, and the higher the temperature), the control chip U1 provides 100% PWM signals respectively, so that the thyristors of the upper and lower heating pipes are all turned on to operate, and the heating pipes are all heated. If the two actual AD values are close to or equal to the set AD values, a small heating ratio coefficient is given by the control chip U1 to respectively work the thyristors of the upper heating pipe and the lower heating pipe, so that the heating pipes work with small power. If the actual AD value is smaller or much smaller than the AD value set by the program, the control chip U1 gives a very small heating coefficient to enable the silicon controlled rectifier to work or to enable the silicon controlled rectifier to stop working, and after the temperature is reduced, the AD value is changed newly, and the PID algorithm is adopted at this time to change the heating coefficient in real time to enable the temperature of the oven to tend to a set straight line.
Specifically, in the fermentation process of the bread maker, the heating pipe generates heat at low power of 200W (the power is changed through silicon controlled rectifier) in the early stage, the changed voltage value is obtained through the change of the thermistor, and then the actual AD value is obtained through AD conversion of the control chip U1. After the real-time AD value is obtained, the real-time AD value is compared with a fermentation AD value set by a program, a PID algorithm is adopted to calculate a heating ratio coefficient needing to be heated, when the temperature is close to the fermentation temperature, the power is slowly reduced, and when the temperature reaches the fermentation temperature, a heating pipe is controlled to be heated by a heating ratio coefficient to keep a constant temperature. Therefore, the heating power is changed by adopting a PID algorithm and silicon controlled rectifier control, so that the problem of fermentation temperature overshoot is solved.
In the process of toasting bread, the heating pipe generates heat with full power 1000W in earlier stage, obtains the voltage value of change through thermistor change, and then carries out AD conversion through control chip U1, obtains actual AD value and compares with the AD value of settlement, adopts PID algorithm, calculates the heating ratio system that actually needs the heating and controls the silicon controlled rectifier heating. And real-time PID algorithm is adopted according to the variable quantity of the thermistor, and the heating ratio coefficient is changed in real time.
Therefore, the PID algorithm is adopted and combined with the controllable silicon, so that the controllable silicon can be frequently switched on and off for heating, the heating pipe can be frequently switched on and off and the power of the heating pipe can be changed in the bread baking process, the temperature is more towards a straight line, and the phenomena of overhigh temperature and overlow temperature can be avoided.
From this, the utility model discloses a constant temperature control circuit is mainly by upper and lower heating pipe control circuit 15, zero cross detection circuit 11, upper and lower thermistor detection circuit 13 and control chip U1 constitute, come the temperature sensing through upper and lower two temperature-sensing probe, can obtain the magnitude of voltage that corresponds temperature variation, rethread control chip U1 carries out AD conversion and obtains corresponding real-time AD value, rethread PID algorithm control silicon controlled rectifier break-make heating, can change heating coefficient in real time, it generates heat from top to bottom to go independent control respectively, solve food about inhomogeneous problem and make the temperature more tend the user to set for, reach accurate accuse temperature.
In addition, the input power supply is connected with the zero-crossing detection circuit 11, the zero-crossing detection circuit 11 generates a zero-crossing signal, and the heating tube control circuit controls the bidirectional thyristor according to the zero-crossing signal, so that the output power of the heating device connected with the heating tube control circuit is flexibly adjusted in a large range.
It should be noted that the above is only the preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and all the insubstantial modifications made by using the design concept of the present invention also fall within the protection scope of the present invention.
Claims (9)
1. The utility model provides a constant temperature control circuit based on baking equipment, is including installing the constant temperature control circuit in baking equipment, its characterized in that:
the constant temperature control circuit comprises a zero-crossing detection circuit, an upper thermistor detection circuit, a lower thermistor detection circuit, a control module, a live wire end, a zero line end and a heating pipe control circuit, wherein the live wire end and the zero line end are connected with an alternating current power supply, the heating pipe control circuit is connected between the live wire end and the zero line end in parallel, the heating pipe control circuit comprises an upper heating pipe control circuit and a lower heating pipe control circuit which are arranged in the baking device in a distributed mode, the input end of the zero-crossing detection circuit is connected between the live wire end and the zero line end, the output end of the zero-crossing detection circuit is connected to the interrupt input end of the control module, the input ends of the upper thermistor detection circuit and the lower thermistor detection circuit respectively detect temperature signals changing along with the temperature in the baking device, and the output ends of the upper thermistor detection circuit and the lower thermistor detection circuit, the control module outputs PWM signals to the upper heating pipe control circuit and the lower heating pipe control circuit according to the temperature signals detected by the upper thermistor detection circuit and the lower thermistor detection circuit so as to control the upper heating pipe control circuit and the lower heating pipe control circuit to output power.
2. The thermostatic control circuit of claim 1, wherein:
the control module comprises a control chip and an analog-to-digital conversion circuit arranged in the control chip.
3. The thermostat control circuit of claim 2, wherein:
the upper thermistor detection circuit comprises a first thermistor, the lower thermistor detection circuits comprise second thermistors, and the control chip detects the voltage values of the first thermistor and the second thermistor respectively;
the analog-to-digital conversion circuit performs A/D conversion on the detected voltage value and then sends the voltage value to the control chip, and the control chip generates PWM signals for controlling the power output of the upper heating tube control circuit and the lower heating tube control circuit according to the voltage value after the A/D conversion.
4. The thermostatic control circuit of claim 1, wherein:
the zero-crossing detection circuit comprises a first resistor, a first diode, a first photoelectric coupler, a first transistor and a first capacitor, wherein the first end of the first resistor is connected to the live wire end, the second end of the first resistor is connected to the first input end of the first photoelectric coupler, the anode of the first diode is connected between the zero wire end and the second output end of the first photoelectric coupler, the cathode of the first diode is connected to the first input end of the first photoelectric coupler, a second resistor is connected between the first output end of the first photoelectric coupler and the base of the first transistor, the second output end of the first photoelectric coupler is connected with the emitter of the first transistor in series and then is grounded, the collector of the first transistor is connected to the interrupt input end of the control module, and the first capacitor is connected with the collector of the first transistor in parallel and connected with the collector of the first transistor in parallel, Between the emitters.
5. The thermostat control circuit according to any one of claims 1 to 4, characterized in that:
the upper heating pipe control circuit comprises a second transistor, a second photoelectric coupler and a first heating pipe, wherein the base of the second transistor is electrically connected with the control module, the collector of the second transistor is electrically connected with the first input end of the second photoelectric coupler, and the output end of the second photoelectric coupler is electrically connected with the first heating pipe.
6. The thermostatic control circuit of claim 5, wherein:
the lower heating pipe control circuit comprises a third transistor, a third photoelectric coupler and a second heating pipe, wherein the base electrode of the third transistor is electrically connected with the control module, the collector electrode of the third transistor is electrically connected with the first input end of the third photoelectric coupler, and the output end of the third photoelectric coupler is electrically connected with the second heating pipe.
7. The thermostatic control circuit of claim 6, wherein:
the first heating pipe and the second heating pipe are both bidirectional thyristors.
8. The thermostat control circuit according to any one of claims 1 to 4, characterized in that:
the constant temperature control circuit further comprises an overcurrent protection circuit, an overvoltage protection circuit and an overheat protection circuit, wherein the overcurrent protection circuit, the overvoltage protection circuit and the overheat protection circuit are respectively and electrically connected with the control module.
9. A thermostatic control circuit according to claim 2 or 3, wherein:
the control chip is MC81F 4316.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020313122.7U CN211403266U (en) | 2020-03-13 | 2020-03-13 | Constant temperature control circuit based on baking equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020313122.7U CN211403266U (en) | 2020-03-13 | 2020-03-13 | Constant temperature control circuit based on baking equipment |
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| CN211403266U true CN211403266U (en) | 2020-09-01 |
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| CN202020313122.7U Active CN211403266U (en) | 2020-03-13 | 2020-03-13 | Constant temperature control circuit based on baking equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117812860A (en) * | 2023-12-25 | 2024-04-02 | 广州荣硕电子科技股份有限公司 | Temperature control system and industrial oven |
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2020
- 2020-03-13 CN CN202020313122.7U patent/CN211403266U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117812860A (en) * | 2023-12-25 | 2024-04-02 | 广州荣硕电子科技股份有限公司 | Temperature control system and industrial oven |
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