CN213814430U - Low-cost constant temperature control circuit - Google Patents
Low-cost constant temperature control circuit Download PDFInfo
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- CN213814430U CN213814430U CN202120104311.8U CN202120104311U CN213814430U CN 213814430 U CN213814430 U CN 213814430U CN 202120104311 U CN202120104311 U CN 202120104311U CN 213814430 U CN213814430 U CN 213814430U
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Abstract
The utility model discloses a low-cost constant temperature control circuit, which comprises a power input end unit, a detection unit and an execution unit, wherein the power input end unit provides electric energy for the whole constant temperature control circuit, the detection unit generates a resistance value which changes relatively with the temperature of a controlled object and provides the resistance value for the execution unit, the execution unit controls the charging and discharging speed of a capacitor according to the changed resistance value provided by the detection unit, through the matching among the power input end unit, the detection unit and the execution unit, when the detection temperature is more than the sudden change value of the resistance value of a thermistor, the execution unit controls a bidirectional thyristor to be closed, so that an electric heating element stops working, thereby realizing the purpose that the controlled object keeps constant temperature, the scheme has no main control chip, does not need program control, has no main control chip power circuit, is easy to design, has small volume and low cost, and can be widely used for modern technologies and products, has good economic benefit.
Description
Technical Field
The utility model relates to an automatic control technical field especially relates to a low-cost constant temperature control circuit.
Background
At present, a constant temperature control circuit mainly comprises a power supply unit, a main control unit, an execution unit and the like. The power supply unit provides electric energy for the whole circuit, the detection unit is generally a temperature sensor, the sensor feeds back the real-time temperature of a target object to the main control unit, the main control unit identifies the temperature signal fed back by the detection unit and calculates different control signals according to a program written in the inner part of an internal controller chip, the execution unit is generally composed of a power amplifier and an electric heating unit, and the heating resistor outputs different powers according to the change of voltage so as to keep the temperature constant. The mode of controlling the temperature needs to be controlled by a main control chip, the use of the main control chip increases the hardware quantity and cost of the circuit, a software program needs to be designed in the main control chip, the design difficulty and the software cost of the circuit are increased, the main control chip generally needs +5V working voltage, a specially designed power circuit is needed to supply the main control chip, and the complexity of the circuit is increased. Accordingly, there is a need in the marketplace for a thermostat control circuit that is easy to design, low in components, small in size, and low in cost.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the defects of the traditional technology and providing a low-cost constant temperature control circuit.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the constant temperature control circuit with low cost comprises a power supply input end unit, a detection unit and an execution unit;
the power supply input end unit provides electric energy for the whole constant temperature control circuit;
the detection unit generates a resistance value which changes in correlation with the temperature of the controlled object and provides the resistance value to the execution unit;
the execution unit controls the charging and discharging speed of the capacitor according to the changed resistance value provided by the detection unit, the bidirectional trigger diode is conducted when the capacitor is charged to reach the conduction voltage of the bidirectional trigger diode in each half power supply period, the bidirectional trigger diode is triggered to conduct after being conducted, the conduction degree of the bidirectional thyristor is controlled by the charging speed of the capacitor, and then the working voltage of the electric heating element is adjusted in real time through the bidirectional thyristor. When the temperature of the controlled object reaches the temperature of the thermistor resistance value mutation, the thermistor resistance value is rapidly increased to be close to infinity, at the moment, the capacitor cannot be charged, the bidirectional trigger diode cannot be triggered to be conducted, and the electric heating element stops working, so that the temperature of the controlled object is controlled to be in the temperature state of the thermistor resistance value mutation.
In the above scheme, the power input end unit is a 220V ac power supply unit; and a first end of the alternating current power supply unit is connected with a first end of the electric heating element, and the other end of the alternating current power supply unit is connected with an A2 main electrode of the bidirectional controllable silicon and a first end of the capacitor.
In the above scheme, the detection unit is a thermistor, a first end of the thermistor is connected with a second end of the electric heating element and a main electrode a1 of the triac, and a second end of the thermistor is connected with a first end of the current limiting resistor.
Preferably, the thermistor is a positive temperature coefficient conductive polymer material, the resistivity of the PTC material is rapidly increased to a limit value at a certain transition temperature, the conductor-insulator mutual transition occurs, and the thermistor with the resistance value mutation at the corresponding temperature can be selected according to different preset temperatures in a specific circuit, so that the constant temperature control requirements of different temperatures are met.
In the above scheme, the execution unit includes an electric heating element, a bidirectional thyristor, a bidirectional trigger diode, a current-limiting resistor, and a capacitor, a second end of the electric heating element is connected to a main electrode of the bidirectional thyristor a1 and a first end of the thermistor, a gate of the bidirectional thyristor G is connected to the first end of the bidirectional trigger diode, and a second end of the bidirectional trigger diode is connected to a second end of the capacitor and a second end of the current-limiting resistor.
Compared with the prior art, the utility model discloses possess following advantage:
the utility model discloses a cooperation between power input end unit, detecting element and the execution unit, when the detection temperature is greater than thermistor resistance value sudden change value, execution unit control bidirectional thyristor closes, makes electric heating element stop work to realize controlled object and keep the homothermal purpose;
the scheme has no main control chip, no program control, no main control chip power supply circuit, easy design, small volume and low cost, can be widely applied to modern processes and products, and has good economic benefit.
Drawings
Fig. 1 is a schematic structural diagram of a low-cost thermostatic control circuit provided by the present invention.
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.
Referring to the attached drawings, the low-cost constant temperature control circuit comprises a power supply input end unit, a detection unit and an execution unit;
the power supply input end unit provides electric energy for the whole constant temperature control circuit, and the detection unit generates a resistance value which changes in correlation with the temperature of the controlled object and provides the resistance value to the execution unit;
the execution unit controls the charging and discharging speed of the capacitor according to the changed resistance value provided by the detection unit, the bidirectional trigger diode is conducted when the capacitor is charged to reach the conduction voltage of the bidirectional trigger diode in each half power supply period, the bidirectional trigger diode is triggered to conduct after being conducted, the conduction degree of the bidirectional thyristor is controlled by the charging speed of the capacitor, and then the working voltage of the electric heating element is adjusted in real time through the bidirectional thyristor. When the temperature of the controlled object reaches the temperature of the thermistor resistance value mutation, the thermistor resistance value is rapidly increased to be close to infinity, at the moment, the capacitor cannot be charged, the bidirectional trigger diode cannot be triggered to be conducted, and the electric heating element stops working, so that the temperature of the controlled object is controlled to be in the state of the thermistor resistance value mutation temperature;
the power supply input end unit is a 220V alternating current power supply unit, a first end of the alternating current power supply unit is connected with a first end of the electric heating element, and the other end of the alternating current power supply is connected with an A2 main electrode of the bidirectional thyristor and a first end of the capacitor;
the detection unit is a thermistor, the first end of the thermistor is connected with the second end of the electric heating element and the A1 main electrode of the bidirectional thyristor, and the second end of the thermistor is connected with the first end of the current limiting resistor;
the thermistor is a positive temperature coefficient conductive polymer material, and the resistivity of the PTC material is rapidly increased to a limit value at a certain transition temperature, so that the mutual transition of a conductor and an insulator occurs;
the specific circuit can select the thermistor with the sudden change of the resistance value at the corresponding temperature according to different preset temperatures, so that the constant temperature control requirements of different temperatures are met;
the execution unit comprises an electric heating element, a bidirectional controllable silicon, a bidirectional trigger diode, a current limiting resistor and a capacitor, wherein the second end of the electric heating element is connected with a main electrode of the bidirectional controllable silicon A1 and the first end of the thermistor, the gate level of the bidirectional controllable silicon G is connected with the first end of the bidirectional trigger diode, and the second end of the bidirectional trigger diode is connected with the second end of the capacitor and the second end of the current limiting resistor.
Now, the operation principle of the present invention is described as follows:
the utility model discloses a cooperation between power input end unit, detecting element and the execution unit, when the detection temperature is greater than thermistor resistance value sudden change value, execution unit control bidirectional thyristor closes, makes electric heating element stop work to the realization is controlled the object and is kept homothermal purpose.
In the present invention, unless otherwise expressly stated or limited, the terms "sliding", "rotating", "fixed", "provided", and the like are to be understood in a broad sense, e.g. as welded connections, as bolted connections, or as integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (5)
1. A low-cost constant temperature control circuit comprises a power supply input end unit, a detection unit and an execution unit, and is characterized in that the power supply input end unit provides electric energy for the whole constant temperature control circuit, the detection unit generates a resistance value which changes in correlation with the temperature of a controlled object and provides the resistance value to the execution unit, the execution unit controls the charging and discharging speed of a capacitor according to the changed resistance value provided by the detection unit, the detection unit is a thermistor, and the first end of the thermistor is connected with the second end of an electric heating element and an A1 main electrode of a bidirectional thyristor; the second end of the thermistor is connected with the first end of the current-limiting resistor, the execution unit comprises an electric heating element, a bidirectional thyristor, a bidirectional trigger diode, a current-limiting resistor and a capacitor, the second end of the electric heating element is connected with a main electrode of the bidirectional thyristor A1 and the first end of the thermistor, a gate of the bidirectional thyristor G is connected with the first end of the bidirectional trigger diode, and the second end of the bidirectional trigger diode is connected with the second end of the capacitor and the second end of the current-limiting resistor.
2. The low-cost thermostatic control circuit according to claim 1, wherein the power input terminal unit is a 220V ac power supply unit; the first end of the alternating current power supply unit is connected with the first end of the electric heating element; the other end of the alternating current power supply is connected with the A2 main electrode of the bidirectional triode thyristor and the first end of the capacitor.
3. A low cost thermostatic control circuit according to claim 1, wherein the thermistor is a positive temperature coefficient conductive polymer material.
4. A low cost thermostatic control circuit according to claim 1, wherein when the temperature of the controlled object reaches the temperature of the abrupt change of the thermistor resistance, the thermistor resistance rapidly increases to approach infinity.
5. The low-cost thermostatic control circuit according to claim 1, wherein the diac is turned on when the capacitor is charged to a conducting voltage of the diac in each half power cycle, the diac is turned on after the diac is turned on, the capacitor charging speed controls the conducting degree of the triac, and the operating voltage of the electric heating element is adjusted in real time by the triac.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120104311.8U CN213814430U (en) | 2021-01-15 | 2021-01-15 | Low-cost constant temperature control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120104311.8U CN213814430U (en) | 2021-01-15 | 2021-01-15 | Low-cost constant temperature control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213814430U true CN213814430U (en) | 2021-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120104311.8U Active CN213814430U (en) | 2021-01-15 | 2021-01-15 | Low-cost constant temperature control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213814430U (en) |
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2021
- 2021-01-15 CN CN202120104311.8U patent/CN213814430U/en active Active
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