CN211509303U - Automatic heat preservation lunch-box control circuit - Google Patents
Automatic heat preservation lunch-box control circuit Download PDFInfo
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- CN211509303U CN211509303U CN201921859675.6U CN201921859675U CN211509303U CN 211509303 U CN211509303 U CN 211509303U CN 201921859675 U CN201921859675 U CN 201921859675U CN 211509303 U CN211509303 U CN 211509303U
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Abstract
The utility model discloses an automatic lunch-box control circuit keeps warm, including the power VCC, the temperature detect module, central processing module, relay control module, heating power J2, power VCC and temperature detect module, central processing module, relay control module is connected respectively, the temperature detect module output is connected with central processing module input, central processing module output is connected with relay control module, relay control module is connected with heating power J2, the system during operation, detect the inside temperature value of lunch-box through thermocouple temperature measurement module, central processing module further controls relay control module's heating power, realize that the inside temperature of lunch-box is less than or when being higher than the default automatic start heating circuit, keep the inside temperature stability of lunch-box.
Description
Technical Field
The utility model relates to an automatic heat preservation lunch-box control circuit.
Background
The heat-insulating lunch box is characterized by that a heat-insulating shell is added on the exterior of general lunch box, and its interior and exterior layers are filled with foamed plastics, and its interior layer is plated with metal film. The heat loss is reduced from three aspects of conduction, radiation and convection. An electric heating device is additionally arranged between the lunch box and the shell to supplement the heat loss and keep the meal at a certain higher temperature, but the heat preservation time of the lunch box becomes a trouble.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides an automatic heat preservation lunch-box control circuit.
The utility model discloses a following technical scheme can realize.
The utility model provides a pair of automatic lunch-box control circuit keeps warm, including power VCC, temperature detection module, central processing module, relay control module, heating power supply J2, the power VCC is connected respectively with temperature detection module, central processing module, relay control module, and the temperature detection module output is connected with central processing module input, and the central processing module output is connected with relay control module, and relay control module is connected with heating power supply J2.
The temperature detection module comprises a galvanic couple J1 and a temperature detection chip U1, wherein a pin 2 of the galvanic couple J1 is respectively connected with a pin 1 and a pin 2 of the temperature detection chip U1 and is grounded, a pin 1 of the galvanic couple J1 is connected with a pin 3 of the temperature detection chip U1, and a pin 4 of the temperature detection chip U1 is grounded.
The central processing module is a single chip microcomputer U2, pins 1-3 of the single chip microcomputer U2 are respectively connected with pins 7-5 of a temperature detection chip U1, pins 31 and 40 of the single chip microcomputer U2 are connected with a power supply VCC, and pin 20 of the single chip microcomputer U2 is grounded.
The relay control module comprises a triode Q1, a relay K1, a resistor R1, the base of a triode Q1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with a pin 21 of a single chip microcomputer U2, the collector of the triode Q1 is grounded, the emitter of the triode Q1 is connected with one end of a relay K1 coil, the other end of the relay K1 coil is connected with a power VCC, a normally open contact of the relay K1 is connected with a pin 2 of a heating power supply J2, and a common contact of the relay K1 is connected with a pin 1 of the heating power supply J2.
The model of the single chip microcomputer U2 is STC89C52, and the model of the temperature detection chip U1 is MAX 6675.
The beneficial effects of the utility model reside in that: when the system works, the temperature value in the lunch box is detected through the thermocouple temperature measuring module, the central processing module further controls the heating power supply of the relay control module, the heating circuit is automatically started when the temperature in the lunch box is lower than or higher than a preset value, and the temperature in the lunch box is kept stable.
Drawings
Fig. 1 is a circuit principle of the present invention.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, the automatic heat preservation lunch box control circuit comprises a power supply VCC, a temperature detection module, a central processing module, a relay control module and a heating power supply J2, wherein the power supply VCC is respectively connected with the temperature detection module, the central processing module and the relay control module, the output end of the temperature detection module is connected with the input end of the central processing module, the output end of the central processing module is connected with the relay control module, and the relay control module is connected with the heating power supply J2.
The temperature detection module comprises a galvanic couple J1 and a temperature detection chip U1, wherein a pin 2 of the galvanic couple J1 is respectively connected with a pin 1 and a pin 2 of the temperature detection chip U1 and is grounded, a pin 1 of the galvanic couple J1 is connected with a pin 3 of the temperature detection chip U1, and a pin 4 of the temperature detection chip U1 is grounded.
The central processing module is a singlechip U2, pins 1-3 of the singlechip U2 are respectively connected with pins 7-5 of the temperature detection chip U1, pins 31 and 40 of the singlechip U2 are connected with a power supply VCC, and pin 20 of the singlechip U2 is grounded.
The relay control module comprises a triode Q1, a relay K1, a resistor R1, the base of a triode Q1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with a pin 21 of a single chip microcomputer U2, the collector of the triode Q1 is grounded, the emitter of the triode Q1 is connected with one end of a relay K1 coil, the other end of the relay K1 coil is connected with a power VCC, a normally open contact of the relay K1 is connected with a pin 2 of a heating power supply J2, and a common contact of the relay K1 is connected with a pin 1 of the heating power supply J2.
The model of the singlechip U2 is STC89C52, and the model of the temperature detection chip U1 is MAX 6675.
The utility model discloses the theory of operation: when the system works, the temperature value in the lunch box is detected through the thermocouple temperature measuring module, the chip U1 converts the measured temperature value into a digital signal, the digital signal is sent to the pin 3 of the singlechip U2 through the pin 5, and the singlechip U2 judges whether the temperature value exceeds a set value at the moment according to an internal program and further controls the relay control module; if the temperature value is lower than the set value, a pin 21 of the single chip microcomputer U2 outputs TTL logic low level, the triode Q1 is conducted, the coil of the relay K1 is electrified, the normally open contact of the relay K1 is closed, the heating power supply is switched on, the heating circuit is conducted, and the lunch box enters a heating state; on the contrary, when the temperature in the lunch box is higher than the set value, the singlechip U2 controls the heating power supply to be disconnected, and the lunch box is in a non-heating state, so that the temperature in the lunch box is stable.
Claims (4)
1. The utility model provides an automatic lunch-box control circuit that keeps warm which characterized in that: including power VCC, temperature detect module, central processing module, relay control module, heating power supply J2, power VCC is connected respectively with temperature detect module, central processing module, relay control module, and the temperature detect module output is connected with central processing module input, and central processing module output is connected with relay control module, and relay control module is connected with heating power supply J2.
2. The automatic heat-preservation lunch box control circuit as claimed in claim 1, wherein: the temperature detection module comprises a galvanic couple J1 and a temperature detection chip U1, wherein a pin 2 of the galvanic couple J1 is respectively connected with a pin 1 and a pin 2 of the temperature detection chip U1 and is grounded, a pin 1 of the galvanic couple J1 is connected with a pin 3 of the temperature detection chip U1, and a pin 4 of the temperature detection chip U1 is grounded.
3. The automatic heat-preservation lunch box control circuit as claimed in claim 1, wherein: the central processing module is a single chip microcomputer U2, pins 1-3 of the single chip microcomputer U2 are respectively connected with pins 7-5 of a temperature detection chip U1, pins 31 and 40 of the single chip microcomputer U2 are connected with a power supply VCC, and pin 20 of the single chip microcomputer U2 is grounded.
4. The automatic heat-preservation lunch box control circuit as claimed in claim 1, wherein: the relay control module comprises a triode Q1, a relay K1, a resistor R1, the base of a triode Q1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with a pin 21 of a single chip microcomputer U2, the collector of the triode Q1 is grounded, the emitter of the triode Q1 is connected with one end of a relay K1 coil, the other end of the relay K1 coil is connected with a power VCC, a normally open contact of the relay K1 is connected with a pin 2 of a heating power supply J2, and a common contact of the relay K1 is connected with a pin 1 of the heating power supply J2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921859675.6U CN211509303U (en) | 2019-10-31 | 2019-10-31 | Automatic heat preservation lunch-box control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921859675.6U CN211509303U (en) | 2019-10-31 | 2019-10-31 | Automatic heat preservation lunch-box control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211509303U true CN211509303U (en) | 2020-09-15 |
Family
ID=72408145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921859675.6U Expired - Fee Related CN211509303U (en) | 2019-10-31 | 2019-10-31 | Automatic heat preservation lunch-box control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211509303U (en) |
-
2019
- 2019-10-31 CN CN201921859675.6U patent/CN211509303U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20200915 Termination date: 20211031 |