CN215817499U - Over-temperature protection circuit - Google Patents
Over-temperature protection circuit Download PDFInfo
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- CN215817499U CN215817499U CN202121255083.0U CN202121255083U CN215817499U CN 215817499 U CN215817499 U CN 215817499U CN 202121255083 U CN202121255083 U CN 202121255083U CN 215817499 U CN215817499 U CN 215817499U
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Abstract
The utility model discloses an over-temperature protection circuit, which comprises a power supply circuit, a temperature compensation circuit, a first switch circuit, a second switch circuit and a switch charging circuit, wherein when the detected temperature is less than a set value, the second switch circuit is switched off, the switch charging circuit drives the first switch circuit to be switched on, and the power supply circuit normally supplies power to electronic equipment; when the detected temperature is larger than or equal to the set value, the second switch circuit is closed, and the switch charging circuit drives the first switch circuit to be disconnected, so that the power supply circuit stops supplying power to the electronic equipment. Compared with the prior art, the utility model detects the real-time temperature of the electronic equipment during working through the temperature compensation circuit, and cuts off power supply in time when the temperature of the electronic equipment is overhigh, thereby playing the overtemperature protection effect and improving the service life and safety of the electronic equipment.
Description
Technical Field
The utility model discloses an over-temperature protection circuit, and belongs to the field of electronic circuits.
Background
Electronic devices generate heat during operation, and the heat is generally difficult to dissipate rapidly, so that the temperature of the electronic devices increases with the increase of the operating time. If the electronic equipment is left to operate continuously regardless of the temperature of the electronic equipment, the equipment is damaged due to overhigh temperature; in addition, excessive temperatures are also prone to spontaneous combustion, creating a greater risk.
SUMMERY OF THE UTILITY MODEL
The utility model provides an over-temperature protection circuit, aiming at improving the defects in the prior art and prolonging the service life and safety of electronic equipment.
The utility model relates to an over-temperature protection circuit, which comprises a power supply circuit, a temperature compensation circuit, a first switch circuit, a second switch circuit and a switch charging circuit,
the power supply circuit is used for supplying power to the electronic equipment; the first switch circuit is arranged on the power supply circuit and used for switching off/on the power supply circuit; the switch charging circuit is used for supplying power to the first switch circuit so as to drive the first switch circuit to be switched on and switched off; the temperature compensation circuit is connected with the second switch circuit, the second switch circuit is connected with the switch charging circuit, the temperature compensation circuit is used for detecting the temperature of the electronic equipment in real time,
when the detected temperature is lower than a set value, the second switch circuit is switched off, the switch charging circuit drives the first switch circuit to be switched on, and the power supply circuit normally supplies power to the electronic equipment;
when the detected temperature is larger than or equal to the set value, the second switch circuit is closed, and the switch charging circuit drives the first switch circuit to be disconnected, so that the power supply circuit stops supplying power to the electronic equipment.
Further, the temperature compensation circuit comprises a temperature sensor, a first resistor and a second resistor, wherein the input end of the temperature sensor is connected with the positive pole of the power supply circuit, the output end of the temperature sensor is connected with the input end of the second resistor, the output end of the second resistor is connected with the input end of the first resistor, and the output end of the first resistor is connected with the negative pole of the power supply circuit.
Further, the second switch circuit is set as a second MOS transistor, a G pole of the second MOS transistor is connected in parallel with the first resistor at the output end of the second resistor, an S pole of the second MOS transistor is connected to the negative pole of the power supply circuit, and a D pole of the second MOS transistor is connected to the output end of the switch charging circuit.
Further, the first switch circuit is set as a first MOS transistor, the G pole of the first MOS transistor and the D pole of the second MOS transistor are connected in parallel to the output end of the switch charging circuit, the S pole of the first MOS transistor is connected to the negative input end of the power supply circuit, and the D pole of the first MOS transistor is connected to the negative output end of the power supply circuit.
Further, the switch charging circuit comprises a third resistor and a fourth resistor, an input end of the third resistor is connected with the anode of the power supply circuit, an output end of the third resistor is connected with an input end of the fourth resistor, and an output end of the fourth resistor is set as an output end of the switch charging circuit.
The power supply circuit further comprises a first clamping circuit, wherein the first clamping circuit comprises a first capacitor, a second capacitor and a first voltage-stabilizing triode, the input ends of the first capacitor, the second capacitor and the first voltage-stabilizing triode are connected with the output end of the switch charging circuit in parallel, and the output ends of the first capacitor, the second capacitor and the first voltage-stabilizing triode are connected with the negative electrode of the power supply circuit in parallel.
The power supply circuit further comprises a second clamping circuit, the second clamping circuit comprises a third capacitor and a second voltage-stabilizing triode, the input ends of the third capacitor and the second voltage-stabilizing triode are connected with the output end of the second resistor in parallel, and the output ends of the third capacitor and the second voltage-stabilizing triode are connected with the negative electrode of the power supply circuit in parallel.
The power supply circuit is provided with a rectifier circuit, and the rectifier circuit is arranged on the power supply circuit and used for converting alternating current at the input end of the power supply circuit into direct current at the output end.
The utility model has the following beneficial effects:
the over-temperature protection circuit detects the real-time temperature of the electronic equipment during working through the temperature compensation circuit, and cuts off power supply in time when the temperature of the electronic equipment is overhigh, so that the over-temperature protection effect is achieved, and the service life and the safety of the electronic equipment are improved.
Drawings
FIG. 1 is a block diagram of an over-temperature protection circuit according to the present invention;
fig. 2 is a circuit diagram of the over-temperature protection circuit according to the present invention.
Detailed Description
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Referring to fig. 1, an embodiment of the utility model discloses an over-temperature protection circuit, which includes a power supply circuit, a temperature compensation circuit, a first switch circuit, a second switch circuit, and a switch charging circuit.
The power supply circuit is used for supplying power to the electronic equipment; the first switch circuit is arranged on the power supply circuit and used for switching off/on the power supply circuit; the switch charging circuit is used for supplying power to the first switch circuit so as to drive the first switch circuit to be switched on and switched off; the temperature compensation circuit is connected with the second switch circuit, the second switch circuit is connected with the switch charging circuit, and the temperature compensation circuit is used for detecting the temperature of the electronic equipment in real time. When the detected temperature is lower than a set value, the second switch circuit is switched off, the switch charging circuit drives the first switch circuit to be switched on, and the power supply circuit normally supplies power to the electronic equipment; when the detected temperature is larger than or equal to the set value, the second switch circuit is closed, and the switch charging circuit drives the first switch circuit to be disconnected, so that the power supply circuit stops supplying power to the electronic equipment.
Specifically, referring to fig. 2, the power supply circuit includes an input terminal (L, N) for connecting to a commercial power and an output terminal (Vin +, Vin-) for connecting to an electronic device, an anode L of the input terminal is connected to an anode Vin + of the output terminal, and a cathode N of the input terminal is connected to a cathode Vin-of the output terminal.
The temperature compensation circuit comprises a temperature sensor H1, a first resistor R1 and a second resistor R2, wherein the input end of the temperature sensor H1 is connected with the anode of the power supply circuit, the output end of the temperature sensor H1 is connected with the input end of the second resistor R2, the output end of the second resistor R2 is connected with the input end of the first resistor R1, and the output end of the first resistor R1 is connected with the cathode of the power supply circuit.
The second switching circuit is a second MOS transistor Q2, the G-pole of the second MOS transistor Q2 is connected in parallel with the first resistor R1 to the output terminal of the second resistor R2, the S-pole of the second MOS transistor Q2 is connected to the negative electrode of the power supply circuit, and the D-pole of the second MOS transistor Q2 is connected to the output terminal of the switching charging circuit.
The first switch circuit is set as a first MOS transistor Q1, the G pole of the first MOS transistor Q1 and the D pole of the second MOS transistor Q2 are connected in parallel to the output end of the switch charging circuit, the S pole of the first MOS transistor Q1 is connected to the negative input end of the power supply circuit, and the D pole of the first MOS transistor Q1 is connected to the negative output end of the power supply circuit.
The switch charging circuit comprises a third resistor R3 and a fourth resistor R4, the input end of the third resistor R3 is connected with the anode of the power supply circuit, the output end of the third resistor R3 is connected with the input end of the fourth resistor R4, and the output end of the fourth resistor R4 is set as the output end of the switch charging circuit.
The power supply circuit further comprises a first clamping circuit, wherein the first clamping circuit comprises a first capacitor C1, a second capacitor C2 and a first voltage-stabilizing triode ZD1, the input ends of the first capacitor C1, the second capacitor C2 and the first voltage-stabilizing triode ZD1 are connected with the output end of the switch charging circuit in parallel, and the output ends of the first capacitor C1, the second capacitor C2 and the first voltage-stabilizing triode ZD1 are connected with the negative electrode of the power supply circuit in parallel. The first clamping circuit limits the voltage at two ends of the first MOS transistor Q1 to be within the trigger voltage range thereof, and prevents the first MOS transistor Q1 from being damaged due to overhigh voltage, thereby playing an overvoltage protection role for the first MOS transistor Q1.
The power supply circuit further comprises a second clamping circuit, the second clamping circuit comprises a third capacitor C3 and a second voltage-stabilizing triode ZD2, the input ends of the third capacitor C3 and the second voltage-stabilizing triode ZD2 are connected with the output end of the second resistor R2 in parallel, and the output ends of the third capacitor C3 and the second voltage-stabilizing triode ZD2 are connected with the negative electrode of the power supply circuit in parallel. The second clamping circuit limits the voltage at two ends of the second MOS transistor Q2 to be within the trigger voltage range thereof, and prevents the second MOS transistor Q2 from being damaged due to overhigh voltage, thereby playing an overvoltage protection role for the second MOS transistor Q2.
The power supply circuit is characterized by further comprising a rectifying circuit, wherein the rectifying circuit is arranged on the power supply circuit and used for converting alternating current at the input end of the power supply circuit into direct current at the output end. The rectifying circuit comprises a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4.
When the temperature compensation circuit works normally, the temperature of the electronic equipment is low, the temperature detected by the temperature sensor H1 is less than a set value, at the moment, the load voltage of the first resistor R1 in the temperature compensation circuit is less than the trigger voltage of the second MOS tube Q2, and the second MOS tube Q2 is disconnected; the switch charging circuit is communicated with the first MOS tube Q1 to enable the first MOS tube Q1 to be conducted. When the temperature detected by the temperature sensor H1 is greater than or equal to a set value along with the temperature rise of the electronic device, the resistance of the temperature sensor H1 is reduced, so that the load voltage of the first resistor R1 in the temperature compensation circuit rises and is greater than or equal to the trigger voltage of the second MOS transistor Q2, and the second MOS transistor Q2 is triggered to be turned on; the switch charging circuit is connected with the second MOS tube Q2, so that the first MOS tube Q1 is disconnected.
In summary, the over-temperature protection circuit of the utility model detects the real-time temperature of the electronic device during operation through the temperature compensation circuit, and cuts off power supply in time when the temperature of the electronic device is too high, so as to achieve the over-temperature protection effect, and improve the service life and safety of the electronic device.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the utility model. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the utility model. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. An over-temperature protection circuit is characterized by comprising a power supply circuit, a temperature compensation circuit, a first switch circuit, a second switch circuit and a switch charging circuit,
the power supply circuit is used for supplying power to the electronic equipment; the first switch circuit is arranged on the power supply circuit and used for switching off/on the power supply circuit; the switch charging circuit is used for supplying power to the first switch circuit so as to drive the first switch circuit to be switched on and switched off; the temperature compensation circuit is connected with the second switch circuit, the second switch circuit is connected with the switch charging circuit, the temperature compensation circuit is used for detecting the temperature of the electronic equipment in real time,
when the detected temperature is lower than a set value, the second switch circuit is switched off, the switch charging circuit drives the first switch circuit to be switched on, and the power supply circuit normally supplies power to the electronic equipment;
when the detected temperature is larger than or equal to the set value, the second switch circuit is closed, and the switch charging circuit drives the first switch circuit to be disconnected, so that the power supply circuit stops supplying power to the electronic equipment.
2. The over-temperature protection circuit of claim 1, wherein the temperature compensation circuit comprises a temperature sensor, a first resistor and a second resistor, an input terminal of the temperature sensor is connected to the positive pole of the power supply circuit, an output terminal of the temperature sensor is connected to an input terminal of the second resistor, an output terminal of the second resistor is connected to an input terminal of the first resistor, and an output terminal of the first resistor is connected to the negative pole of the power supply circuit.
3. The over-temperature protection circuit as claimed in claim 2, wherein the second switching circuit is configured as a second MOS transistor, a G-pole of the second MOS transistor is connected in parallel with the first resistor to the output terminal of the second resistor, an S-pole of the second MOS transistor is connected to the negative pole of the power supply circuit, and a D-pole of the second MOS transistor is connected to the output terminal of the switching charging circuit.
4. The over-temperature protection circuit as claimed in claim 3, wherein the first switching circuit is configured as a first MOS transistor, a G-pole of the first MOS transistor is connected in parallel with a D-pole of the second MOS transistor to the output terminal of the switching charging circuit, an S-pole of the first MOS transistor is connected to the negative input terminal of the power supply circuit, and a D-pole of the first MOS transistor is connected to the negative output terminal of the power supply circuit.
5. The over-temperature protection circuit as claimed in claim 4, wherein the switch charging circuit comprises a third resistor and a fourth resistor, an input terminal of the third resistor is connected to the positive electrode of the power supply circuit, an output terminal of the third resistor is connected to an input terminal of the fourth resistor, and an output terminal of the fourth resistor is set as an output terminal of the switch charging circuit.
6. The over-temperature protection circuit of claim 5, further comprising a first clamping circuit, wherein the first clamping circuit comprises a first capacitor, a second capacitor and a first voltage-stabilizing transistor, wherein input terminals of the first capacitor, the second capacitor and the first voltage-stabilizing transistor are connected in parallel with an output terminal of the switching charging circuit, and output terminals of the first capacitor, the second capacitor and the first voltage-stabilizing transistor are connected in parallel with a negative electrode of the power supply circuit.
7. The over-temperature protection circuit of claim 5, further comprising a second clamping circuit, wherein the second clamping circuit comprises a third capacitor and a second voltage-stabilizing transistor, wherein the input terminals of the third capacitor and the second voltage-stabilizing transistor are connected in parallel with the output terminal of the second resistor, and the output terminals of the third capacitor and the second voltage-stabilizing transistor are connected in parallel with the negative electrode of the power supply circuit.
8. The over-temperature protection circuit of claim 1, further comprising a rectifier circuit disposed on the power supply circuit for converting ac power at an input of the power supply circuit to dc power at an output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121255083.0U CN215817499U (en) | 2021-06-04 | 2021-06-04 | Over-temperature protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121255083.0U CN215817499U (en) | 2021-06-04 | 2021-06-04 | Over-temperature protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215817499U true CN215817499U (en) | 2022-02-11 |
Family
ID=80175428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121255083.0U Active CN215817499U (en) | 2021-06-04 | 2021-06-04 | Over-temperature protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215817499U (en) |
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2021
- 2021-06-04 CN CN202121255083.0U patent/CN215817499U/en active Active
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