CN215769507U - Safe and controllable heating device - Google Patents
Safe and controllable heating device Download PDFInfo
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- CN215769507U CN215769507U CN202120916242.0U CN202120916242U CN215769507U CN 215769507 U CN215769507 U CN 215769507U CN 202120916242 U CN202120916242 U CN 202120916242U CN 215769507 U CN215769507 U CN 215769507U
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Abstract
The utility model discloses a safe and controllable heating device, which comprises a heating module and an electric control module; the heating module comprises a heating conductor, a PTC (positive temperature coefficient) and an NTC (negative temperature coefficient), and the heating conductor is attached to the insulating heat-conducting base material; one end of the heating conductor is electrically connected with the electric control module, the other end of the heating conductor is electrically connected with one end of the PTC, and the other end of the PTC is electrically connected with the electric control module; the NTC is arranged beside the heating conductor, and two ends of the NTC are electrically connected with the electric control module. When the temperature of the PTC heater is reduced to the lower limit threshold, the electric control module is started to heat. In the process, if the NTC fails, the temperature continuously rises until the temperature reaches the PTC protection temperature, the PTC is in a high resistance state, the current greatly decreases, and the temperature protection effect is achieved. The utility model can reduce the volume and has stable power.
Description
Technical Field
The utility model relates to the technical field of automatic temperature control, in particular to a safe and controllable heating device.
Background
Most of the commercially available heating devices adopt a PTC thermistor heating scheme, and a PTC thermistor is a semiconductor resistor with temperature sensitivity, and when the temperature exceeds a certain temperature (curie temperature), the resistance value of the PTC thermistor increases in a step manner along with the rise of the temperature. The main disadvantages of this solution are large size and high cost, and the secondary disadvantages are unstable in power and affected by temperature.
SUMMERY OF THE UTILITY MODEL
In view of the above, in order to solve the above problems in the prior art, the present invention provides a safe and controllable heat generating device, which employs both PTC and NTC, and has reduced size and stable power while improving cost.
The utility model solves the problems through the following technical means:
a safe and controllable heating device comprises a heating module and an electric control module;
the heating module comprises a heating conductor, a PTC (positive temperature coefficient) and an NTC (negative temperature coefficient), and the heating conductor is attached to the insulating heat-conducting base material;
one end of the heating conductor is electrically connected with the electric control module, the other end of the heating conductor is electrically connected with one end of the PTC, and the other end of the PTC is electrically connected with the electric control module;
the NTC is arranged beside the heating conductor, and two ends of the NTC are electrically connected with the electric control module.
Further, the electric control module comprises a chip U1, a P-channel MOS transistor M1, a triode Q1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1 and a capacitor C2;
Further, the model of the chip U1 is PIC16F 1503.
Compared with the prior art, the utility model has the beneficial effects that at least:
the utility model adopts PTC and NTC, when the heating device starts heating, the PTC is in low resistance conduction state, the electric control module stops heating along with the gradual rise of temperature, if reaching the upper limit threshold of NTC temperature control, when the temperature drops to the lower limit threshold, the electric control module restarts heating until the work cycle of the product is finished. In the process, if the NTC fails, the temperature continuously rises until the temperature reaches the PTC protection temperature, the PTC is in a high-resistance state, and the current (power) is greatly reduced, so that the temperature protection effect is achieved. The utility model can reduce the volume and stabilize the power while improving the cost. At present, the drying knife is mainly applied to the interior of a knife rest and is used for drying knives, kitchen ware, tableware and the like.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a safe and controllable heat-generating device of the present invention;
fig. 2 is a circuit diagram of the electrical control module of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.
The utility model provides a safe and controllable heating device, which comprises a heating module and an electric control module, wherein the left side is the heating module and the right side is the electric control module as shown in figure 1. The two modules are connected through a wire for power supply and control.
The left heating module comprises a heating conductor, a PTC and an NTC, and the heating conductor is attached to the insulating heat-conducting base material.
One end of the heating conductor is electrically connected with the electric control module, the other end of the heating conductor is electrically connected with one end of the PTC, and the other end of the PTC is electrically connected with the electric control module.
The NTC is arranged beside the heating conductor, and two ends of the NTC are electrically connected with the electric control module.
The PTC and heat conductor are electrically connected by soldering (e.g., SMT pad soldering). The NTC and the electric control module are electrically communicated through welding (such as SMT patch welding).
The heating conductor is used for heating and drying, and the PTC is also called a restorable fuse and is used for greatly reducing current when the temperature is too high so as to reduce heating; the NTC is used for feeding back the temperature to the right electrical control module in real time. The right side electric control module is used for power supply and temperature control.
The electric control module is started, the heating conductor starts to heat, the PTC is in a low-resistance conduction state, the electric control module stops heating along with the gradual rise of the temperature if the temperature reaches the NTC temperature control upper limit threshold value, and the electric control module restarts heating until the working cycle of the product is finished when the temperature is reduced to the lower limit threshold value. In the process, if the NTC fails, the temperature continuously rises until the temperature reaches the PTC protection temperature, the PTC is in a high-resistance state, and the current (power) is greatly reduced, so that the temperature protection effect is achieved.
As shown in fig. 2, the electrical control module includes a chip U1, a P-channel MOS transistor M1, a transistor Q1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1, and a capacitor C2;
In this embodiment, the model of the chip U1 is PIC16F 1503.
The utility model adopts PTC and NTC, which can reduce volume and stabilize power while improving cost. At present, the drying knife is mainly applied to the interior of a knife rest and is used for drying knives, kitchen ware, tableware and the like.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (3)
1. A safe and controllable heating device is characterized by comprising a heating module and an electric control module;
the heating module comprises a heating conductor, a PTC (positive temperature coefficient) and an NTC (negative temperature coefficient), and the heating conductor is attached to the insulating heat-conducting base material;
one end of the heating conductor is electrically connected with the electric control module, the other end of the heating conductor is electrically connected with one end of the PTC, and the other end of the PTC is electrically connected with the electric control module;
the NTC is arranged beside the heating conductor, and two ends of the NTC are electrically connected with the electric control module.
2. The safe and controllable heating device according to claim 1, wherein the electric control module comprises a chip U1, a P-channel MOS transistor M1, a transistor Q1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1 and a capacitor C2;
pin 1 of chip U1 is connected with one end of capacitor C1 and power supply 5V respectively, another end of capacitor C1 is grounded, pin 9 of chip U1 is connected with one end of resistor R6 and one end of NTC respectively, another end of resistor R6 is connected with power supply 5V, another end of NTC is grounded, pin 10 of chip U1 is connected with one end of resistor R5 and another end of PTC respectively, pin 11 of chip U1 is connected with one end of resistor R3 and one end of resistor R4 respectively, another end of resistor R3 is connected with base of triode Q1, emitter of triode Q1 is connected with another end of resistor R4, one end of capacitor C2 and another end of resistor R5 respectively and grounded, collector of triode Q1 is connected with one end of resistor R2, another end of resistor R2 is connected with one end of resistor R1 and G pole of MOS tube M1 respectively, another end of resistor R1 is connected with S pole of MOS tube M1 and power supply VCC, another end of MOS tube M1 is connected with heating conductor C and one end of MOS tube C1 respectively, pin 14 of chip U1 is connected to ground.
3. The safe and controllable heat-generating device according to claim 2, wherein the chip U1 has a model number of PIC16F 1503.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120916242.0U CN215769507U (en) | 2021-04-29 | 2021-04-29 | Safe and controllable heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120916242.0U CN215769507U (en) | 2021-04-29 | 2021-04-29 | Safe and controllable heating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215769507U true CN215769507U (en) | 2022-02-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120916242.0U Active CN215769507U (en) | 2021-04-29 | 2021-04-29 | Safe and controllable heating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215769507U (en) |
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2021
- 2021-04-29 CN CN202120916242.0U patent/CN215769507U/en active Active
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