CN215419571U - Over-temperature prevention detection and protection circuit - Google Patents
Over-temperature prevention detection and protection circuit Download PDFInfo
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- CN215419571U CN215419571U CN202121961467.4U CN202121961467U CN215419571U CN 215419571 U CN215419571 U CN 215419571U CN 202121961467 U CN202121961467 U CN 202121961467U CN 215419571 U CN215419571 U CN 215419571U
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Abstract
The utility model discloses an anti-over-temperature detection and protection circuit which comprises a power supply circuit, an MCU circuit, a signal sampling circuit and a load control and working circuit, wherein the power supply circuit comprises a rectifier bridge, the rectifier bridge is connected between a live wire and a zero wire, a voltage stabilizing diode ZD1, a capacitor C2, an electrolytic capacitor EC2, a diode ZD2, an electrolytic capacitor EC1 and a capacitor C1 are sequentially connected between the live wire and the zero wire, a polystyrene capacitor CB1, a resistor R1 and a resistor R2 are connected in series on the live wire, a resistor R3 is connected in parallel on a polystyrene capacitor CB1, the load control and working circuit comprises a load, a relay RLY1 and a triode Q1, the signal sampling circuit comprises a resistor R6, a resistor R7, a diode D6 and a diode D7, and the MCU circuit comprises a chip U1. The utility model has the advantages that: the use of parts is less, and repeated starting of the load is prevented.
Description
Technical Field
The utility model relates to the technical field of over-temperature prevention detection and protection circuits, in particular to an over-temperature prevention detection and protection circuit.
Background
Among the present heating load controller, at not having NTC temperature detection circuit, the dry combustion method who singly utilizes the temperature controller break-make to control the load that generates heat can produce because of the temperature drop, and the temperature controller resets, and load repetitive heating problem leads to:
the service life of the temperature controller is shortened;
the service life of the heater is shortened due to the repeated dry burning of the heating load;
the temperature controller repeatedly works at high temperature under the problems of shortened service life and the like, so that the risk of runaway is caused, and the heating load always works.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing an over-temperature prevention detection and protection circuit which uses few parts and prevents repeated starting of a load.
In order to solve the technical problems, the technical scheme provided by the utility model is as follows: an over-temperature prevention detection and protection circuit comprises a power supply circuit, an MCU circuit, a signal sampling circuit and a load control and working circuit, wherein the power supply circuit comprises a rectifier bridge, the rectifier bridge is connected between a live wire and a zero wire, a voltage stabilizing diode ZD1, a capacitor C2, an electrolytic capacitor EC2, a diode ZD2, an electrolytic capacitor EC1 and a capacitor C1 are sequentially connected between the live wire and the zero wire, a polystyrene capacitor CB1, a resistor R1 and a resistor R2 are connected in series on the live wire, a resistor R3 is connected in parallel on the polystyrene capacitor CB1, the load control and working circuit comprises a load, a relay RLY1 and a triode Q1, a diode D5 is connected on a collector electrode of the triode Q1, a diode D5 is connected in parallel with a relay RLY1, the relay RLY1 is connected with the live wire, an emitter electrode of the triode Q1 is grounded, a resistor R1 is connected between a base electrode and an emitter electrode of a triode Q1, the load is connected with the zero line, the load passes through the temperature controller and is connected with relay RLY1, signal sampling circuit includes resistance R6, resistance R7, diode D6 and diode D7, resistance R6 is connected with the 5V power, diode D7 ground connection, resistance R7 and diode D6 establish ties and are connected with the load, the MCU circuit includes chip U1, No. 1 pin and the 5V power of chip U1 are connected, No. 8 pin ground connection, it has electric capacity C3 to connect between No. 1 pin and No. 8 pin of chip U1, No. 2 pin of chip U1 passes through resistance R4 and is connected with triode Q1's base, No. 7 pin and the diode D6 of chip U1 are connected.
Compared with the prior art, the utility model has the advantages that: the over-temperature prevention detection and protection circuit comprises a power supply circuit, an MCU circuit, a signal sampling circuit and a load control and working circuit, wherein the power supply circuit provides power for the MCU circuit and the load control and working circuit, a relay RLY1 is attracted under a load working mode, a live wire input by AC flows through a relay RLY1, enters a load through a temperature controller and then returns to a zero line input by the AC, a load heating closed loop is formed, at the moment, a closed loop is formed in the signal sampling circuit due to load working, and the MCU detects that a signal in the signal sampling circuit is a 50HZ/60HZ zero-crossing square wave signal; when the temperature reaches the dry burning protection temperature, the temperature controller is disconnected, and the signal detection circuit loses the alternating current characteristic, so that the electric signal detected by the MCU on the signal sampling circuit is in a continuous high level; the MCU sends a signal for turning off the relay RLY1, so that the problem that the temperature controller resets due to temperature drop to cause the load to work again is solved.
As an improvement, the voltage stabilizing diode ZD1 is connected with a 12V power supply.
As a modification, the capacitor C1 is connected with a 5V power supply and a ground at two ends.
Drawings
Fig. 1 is a circuit diagram of a power supply circuit of an over-temperature prevention detection and protection circuit according to the present invention.
Fig. 2 is a circuit diagram of an MCU circuit of the over-temperature prevention detection and protection circuit of the present invention.
FIG. 3 is a circuit diagram of a signal sampling circuit of the over-temperature protection and detection circuit according to the present invention.
FIG. 4 is a circuit diagram of a load control and operation loop of an over-temperature prevention detection and protection circuit according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
With reference to the attached drawing, an over-temperature prevention detection and protection circuit comprises a power supply circuit, an MCU circuit, a signal sampling circuit and a load control and working circuit, wherein the power supply circuit comprises a rectifier bridge, the rectifier bridge is connected between a live wire and a zero wire, a zener diode ZD1, a capacitor C2, an electrolytic capacitor EC2, a diode ZD2, an electrolytic capacitor EC1 and a capacitor C1 are sequentially connected between the live wire and the zero wire, a polystyrene capacitor CB1, a resistor R1 and a resistor R2 are connected in series on the live wire, a resistor R3 is connected in parallel on the polystyrene capacitor CB1, the load control and working circuit comprises a load, a relay RLY1 and a triode Q1, a diode D5 is connected on a collector of the triode Q1, a diode D5 is connected in parallel with the relay RLY1, the relay RLY1 is connected with the live wire, an emitter of the triode Q1 is grounded, a resistor R1 is connected between a base and an emitter of a triode Q1, the load is connected with the zero line, the load passes through the temperature controller and is connected with relay RLY1, signal sampling circuit includes resistance R6, resistance R7, diode D6 and diode D7, resistance R6 is connected with the 5V power, diode D7 ground connection, resistance R7 and diode D6 establish ties and are connected with the load, the MCU circuit includes chip U1, No. 1 pin and the 5V power of chip U1 are connected, No. 8 pin ground connection, it has electric capacity C3 to connect between No. 1 pin and No. 8 pin of chip U1, No. 2 pin of chip U1 passes through resistance R4 and is connected with triode Q1's base, No. 7 pin and the diode D6 of chip U1 are connected.
The voltage stabilizing diode ZD1 is connected with a 12V power supply.
The capacitor C1 is connected with a 5V power supply and the ground at two ends.
The working principle of the utility model is as follows: the over-temperature prevention detection and protection circuit comprises a power supply circuit, an MCU circuit, a signal sampling circuit and a load control and working circuit, wherein the power supply circuit provides power for the MCU circuit and the load control and working circuit, under a load working mode, a relay RLY1 is attracted, a live wire input by an AC flows through a relay RLY1, enters a load through a temperature controller and then returns to a zero line input by the AC, a load heating closed loop is formed, at the moment, a closed loop is formed in the signal sampling circuit due to load working, and the MCU detects that a signal in the signal sampling circuit is a 50HZ/60HZ zero-crossing square wave signal. When the temperature reaches the dry-burning protection temperature, the temperature controller is disconnected, the signal detection circuit is provided with an electric signal with continuous high level due to the loss of the alternating current characteristic, and the signal sampling circuit is detected by the MCU. The MCU sends a signal for turning off the relay RLY1, so that the problem that the temperature controller resets due to temperature drop to cause the load to work again is solved.
The present invention and its embodiments have been described, without limitation, and the embodiments shown in the drawings are only one embodiment of the present invention, and the actual configuration is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (3)
1. The utility model provides a prevent overtemperature detection and protection circuit, includes power supply circuit, MCU circuit, signal sampling circuit and load control and work circuit, its characterized in that: the power supply circuit comprises a rectifier bridge, the rectifier bridge is connected between a live wire and a zero wire, a voltage stabilizing diode ZD1, a capacitor C2, an electrolytic capacitor EC2, a diode ZD2, an electrolytic capacitor EC1 and a capacitor C1 are sequentially connected between the live wire and the zero wire, a polystyrene capacitor CB1, a resistor R1 and a resistor R2 are connected on the live wire in series, a resistor R3 is connected on the polystyrene capacitor CB1 in parallel, the load control and working circuit comprises a load, a relay RLY1 and a triode Q1, a diode D5 is connected on a collector of the triode Q1, the diode D5 is connected with a relay RLY1 in parallel, the relay RLY1 is connected with the live wire, an emitter of the triode Q1 is grounded, a resistor R1 is connected between a base and an emitter of the triode Q1, the load is connected with the zero wire, the load is connected with a relay RLY 54 through a temperature controller, and the signal sampling circuit comprises a resistor R6, a resistor R1 and a resistor R1, Resistance R7, diode D6 and diode D7, resistance R6 is connected with the 5V power, diode D7 ground connection, resistance R7 and diode D6 are established ties and are connected with the load, the MCU circuit includes chip U1, chip U1's No. 1 pin is connected with the 5V power, No. 8 pin ground connection, it has electric capacity C3 to connect between chip U1's No. 1 pin and No. 8 pin, chip U1's No. 2 pin is connected with triode Q1's base through resistance R4, chip U1's No. 7 pin is connected with diode D6.
2. The over-temperature prevention detection and protection circuit of claim 1, wherein: the voltage stabilizing diode ZD1 is connected with a 12V power supply.
3. The over-temperature prevention detection and protection circuit of claim 1, wherein: the capacitor C1 is connected with a 5V power supply and the ground at two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121961467.4U CN215419571U (en) | 2021-08-20 | 2021-08-20 | Over-temperature prevention detection and protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121961467.4U CN215419571U (en) | 2021-08-20 | 2021-08-20 | Over-temperature prevention detection and protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215419571U true CN215419571U (en) | 2022-01-04 |
Family
ID=79663897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121961467.4U Active CN215419571U (en) | 2021-08-20 | 2021-08-20 | Over-temperature prevention detection and protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215419571U (en) |
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2021
- 2021-08-20 CN CN202121961467.4U patent/CN215419571U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No. 365, Dongkeng Avenue South, Dongkeng Town, Dongguan City, Guangdong Province, 523000 Patentee after: Meispu Electronics Co.,Ltd. Address before: No. 365, Dongkeng Avenue South, Dongkeng Town, Dongguan City, Guangdong Province, 523000 Patentee before: DONGGUAN CITY MAISI PU ELECTRONICS CO.,LTD. |
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| CP01 | Change in the name or title of a patent holder |