CN215601022U - Electronic equipment and over-temperature protection circuit thereof - Google Patents
Electronic equipment and over-temperature protection circuit thereof Download PDFInfo
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- CN215601022U CN215601022U CN202120090605.XU CN202120090605U CN215601022U CN 215601022 U CN215601022 U CN 215601022U CN 202120090605 U CN202120090605 U CN 202120090605U CN 215601022 U CN215601022 U CN 215601022U
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Abstract
The utility model discloses electronic equipment and an over-temperature protection circuit thereof, wherein the over-temperature protection circuit comprises a temperature detection module, a software protection module and a hardware protection module, wherein the input ends of the software protection module and the hardware protection module are connected with the output end of the temperature detection module, and the output ends of the software protection module and the hardware protection module are connected with a power supply switch of a heating head of the electronic equipment; the temperature detection module is used for sensing the temperature of the heating head and outputting a voltage signal corresponding to the temperature; the software protection module is used for controlling the working state of the power supply switch according to the voltage signal so as to perform software over-temperature protection; the hardware protection module is used for triggering the power supply switch to act according to the voltage signal so as to perform hardware over-temperature protection. Therefore, the software and hardware are synchronously subjected to over-temperature protection, double guarantees can be provided, and the reliability of the over-temperature protection is improved.
Description
Technical Field
The utility model relates to the technical field of printers, in particular to electronic equipment and an over-temperature protection circuit thereof.
Background
In the circuit design process of electronic equipment, some devices or peripherals which generate heat seriously need to be protected. How to distinguish heating under the normal operating condition and heating under the abnormal condition and protect heating under the abnormal condition in time needs to be realized through the over-temperature protection circuit design. The over-temperature protection needs to be ensured to be timely and effective, otherwise, the temperature is continuously increased, and safety accidents are easily caused. For example, the heating head of the thermal printer core needs to continuously heat the thermal paper so that the thermal paper displays the printed content, however, if the machine is abnormal, the heating head of the printer core continuously heats for a long time, the temperature can exceed the ignition point of the paper, the machine is ignited, the shell is melted, and serious safety accidents can also be caused.
In the related art, the Temperature detection is performed by connecting a constant value resistor and an NTC (Negative Temperature Coefficient) resistor in series, dividing a constant voltage, and connecting the divided voltage to an ADC (Analog-to-Digital Converter) interface of the main control chip. The NTC resistor is placed at a position where temperature is required to be detected, and due to the characteristics of the NTC resistor, when the temperature rises, the resistance value thereof is reduced, and when the temperature falls, the resistance value thereof is increased, thereby causing the voltage division to change. The main control chip reads the voltage division change through the ADC port, and further converts the temperature change, and then judges whether to start over-temperature protection or not and whether to cut off the power supply circuit or not according to a preset temperature threshold value.
However, the above method completely depends on detection, identification and judgment of software, and in an over-temperature state, once software fails (such as system runaway and downtime), detection and judgment cannot be made any more, and over-temperature protection cannot be started in time, so that over-temperature damage of a device and even safety accidents occur.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first objective of the present invention is to provide an over-temperature protection circuit for electronic equipment, which can implement software and hardware synchronous over-temperature protection, provide dual guarantees, and improve reliability of over-temperature protection.
A second object of the present invention is to provide an electronic device.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides an over-temperature protection circuit for an electronic device, including: the temperature detection device comprises a temperature detection module, a software protection module and a hardware protection module, wherein the input end of the software protection module and the input end of the hardware protection module are connected with the output end of the temperature detection module, and the output end of the software protection module and the output end of the hardware protection module are connected with a power supply switch of a heating head of the electronic equipment; the temperature detection module is used for sensing the temperature of the heating head and outputting a voltage signal corresponding to the temperature; the software protection module is used for controlling the working state of the power supply switch according to the voltage signal so as to perform software over-temperature protection; the hardware protection module is used for triggering the power supply switch to act according to the voltage signal so as to perform hardware over-temperature protection.
According to the over-temperature protection circuit of the electronic equipment, the input end of the software protection module and the input end of the hardware protection module are connected with the output end of the temperature detection module, the output end of the software protection module and the output end of the hardware protection module are connected with the power supply switch of the heating head of the electronic equipment, the temperature of the heating head is sensed through the temperature detection module, a voltage signal corresponding to the temperature is output, the working state of the power supply switch is controlled through the software protection module according to the voltage signal to perform software over-temperature protection, and meanwhile, the power supply switch is triggered through the hardware protection module according to the voltage signal to perform hardware over-temperature protection. Therefore, even if the software is abnormal and cannot be detected and judged, the hardware protection module can take effect in time and compares the abnormal with a preset threshold value of the hardware to judge whether the over-temperature problem exists or not, and if the abnormal heating occurs, the power supply circuit can be cut off in time to prevent the over-temperature problem. The over-temperature protection circuit of the electronic equipment can realize synchronous over-temperature protection of software and hardware, can provide double guarantees and improves the reliability of the over-temperature protection.
In one embodiment of the present invention, the temperature detection module includes: one end of the first resistor is connected with a first preset power supply; and one end of the thermistor is respectively connected with the other end of the first resistor and the output end of the temperature detection module, and the other end of the thermistor is grounded.
In one embodiment of the utility model, the thermistor is a negative temperature coefficient thermistor.
In one embodiment of the utility model, the software protection module comprises: and an ADC port of the first controller is connected with the output end of the temperature detection module, and a control port of the first controller is connected with the power supply switch.
In one embodiment of the utility model, the software protection module further comprises: and one end of the first capacitor is connected with the ADC port of the first controller, and the other end of the first capacitor is grounded.
In one embodiment of the utility model, the software protection module comprises: the input end of the AD conversion unit is connected with the output end of the temperature detection module; and the acquisition port of the second controller is connected with the output end of the AD conversion unit, and the control port of the second controller is connected with the power supply switch.
In one embodiment of the utility model, the hardware protection module comprises: the negative input end of the comparator is connected with the output end of the temperature detection module; the output end of the reference voltage providing unit is connected with the positive input end of the comparator; one end of the second resistor is connected with the output end of the comparator, and the other end of the second resistor is connected with a second preset power supply; one end of the second capacitor is connected with the other end of the second resistor, and the other end of the second capacitor is grounded; the control end of the first switch tube is connected with the output end of the comparator, the first end of the first switch tube is connected with the power supply switch, and the second end of the first switch tube is grounded.
In one embodiment of the present invention, the reference voltage providing unit includes: one end of the third resistor is connected with a third preset power supply; and one end of the fourth resistor is respectively connected with the other end of the third resistor and the positive input end of the comparator, and the other end of the fourth resistor is grounded.
In one embodiment of the present invention, a power supply switch includes: the first end of the second switching tube is connected with the power supply of the heating head, the second end of the second switching tube is connected with the power supply end of the heating head, and the control end of the second switching tube is respectively connected with the output end of the software protection module and the output end of the hardware protection module; and the first end of the third switching tube is connected with the second end of the second switching tube, the second end of the third switching tube is grounded, and the control end of the third switching tube is respectively connected with the output end of the software protection module and the output end of the hardware protection module.
In order to achieve the above object, a second aspect of the present invention provides an electronic device, including the over-temperature protection circuit of the electronic device.
According to the electronic equipment provided by the embodiment of the utility model, through the over-temperature protection circuit of the electronic equipment, even if software is abnormal and cannot be detected and judged, the hardware protection module can take effect in time and is compared with a threshold value preset by hardware to judge whether an over-temperature problem exists or not, and if abnormal heating occurs, the power supply circuit can be cut off in time to prevent the over-temperature problem from occurring. The electronic equipment provided by the embodiment of the utility model can realize the synchronous over-temperature protection of software and hardware, can provide double guarantees, and improves the reliability of the over-temperature protection.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
FIG. 1 is a schematic diagram of an over-temperature protection circuit of an electronic device according to one embodiment of the utility model;
FIG. 2 is a schematic diagram of a power supply switch according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of a power switch according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of an electronic device according to one embodiment of the utility model.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.
An overheat protection circuit for an electronic device and an electronic device provided by an embodiment of the present invention are described below with reference to the drawings. The electronic apparatus in the present application is an electronic apparatus having a heating head (heating device), and may be a thermal printer having a heating head.
Fig. 1 is a schematic diagram of an over-temperature protection circuit of an electronic device according to an embodiment of the present invention, and referring to fig. 1, the over-temperature protection circuit 100 of the electronic device includes: a temperature detection module 101, a software protection module 102 and a hardware protection module 103.
The input end of the software protection module 102 and the input end of the hardware protection module 103 are both connected with the output end of the temperature detection module 101, and the output end of the software protection module 102 and the output end of the hardware protection module 103 are both connected with a power supply switch U3 of a heating head of the electronic equipment; the temperature detection module 101 is used for sensing the temperature of the heating head and outputting a voltage signal corresponding to the temperature; the software protection module 102 controls the working state of the power supply switch U3 according to the voltage signal to perform software over-temperature protection; the hardware protection module 103 is used for triggering the power supply switch U3 to act according to the voltage signal to perform hardware over-temperature protection.
That is to say, the software protection module 102 and the hardware protection module 103 are both connected to the temperature detection module 101 and the power supply switch U3, so as to perform software and hardware synchronous protection on the electronic device through the software protection module 102 and the hardware protection module 103, and thus even if one of them fails to perform protection, the other can perform protection, so that the protection is more reliable.
Specifically, the temperature detection module 101 may be correspondingly placed near a device requiring temperature detection, such as a heating head of an electronic apparatus, and the temperature of the heating head is sensed by the temperature detection module 101 and a voltage signal corresponding to the temperature is output. On one hand, the voltage signal is transmitted to the software protection module 102, the software protection module 102 calculates the temperature of the heating head according to the voltage signal, and judges whether the temperature exceeds a preset temperature threshold, if the temperature exceeds the preset temperature threshold, the power supply switch U3 is controlled to be in a disconnected state, so that the electronic equipment is subjected to software over-temperature protection; on the other hand, the voltage signal is also transmitted to the hardware protection module 103, the hardware protection module 103 compares the voltage signal through a hardware circuit, and when the voltage signal exceeds a voltage signal corresponding to a preset temperature threshold, the power supply switch U3 is controlled to be in an off state, so as to perform hardware over-temperature protection on the electronic device.
Because the software protection module 102 and the hardware protection module 103 can both perform over-temperature protection on the electronic device, even if one of the software protection modules fails to perform protection, the other software protection module can also perform protection, for example, even if the software is abnormal and cannot be detected and judged, the hardware protection module can also take effect in time and compare with a threshold value preset by hardware to judge whether an over-temperature problem exists, if abnormal heating occurs, the power supply circuit can be cut off in time, the over-temperature problem is prevented, a dual protection effect is achieved, and the protection is more reliable.
In one embodiment, as shown in fig. 1, the temperature detection module 101 includes: the temperature detection circuit comprises a first resistor R1 and a thermistor RT, wherein one end of the first resistor R1 is connected with a first preset power supply VCC1, one end of the thermistor RT is respectively connected with the other end of the first resistor R1 and the output end of the temperature detection module 101, and the other end of the thermistor RT is grounded.
Specifically, the thermistor RT is an NTC resistor, which can be placed near a device that needs to detect temperature according to actual requirements, for example, near a heating head of an electronic device, and detects the temperature of the heating head through the thermistor RT, and when the temperature of the heating head changes, the resistance of the thermistor RT will change, so that the voltage at the output end of the temperature detection module 101 changes, and further the software protection module 120 and the hardware protection module 103 perform over-temperature protection based on the voltage signal at the output end of the temperature detection module 101.
In one embodiment, as shown in FIG. 1, the software protection module 102 includes: an ADC port of the first controller U1 and the first controller U1 is connected to an output terminal of the temperature detection module 101, and a control port of the first controller U1 is connected to the power supply switch U3. Wherein, the control port may be a GPIO interface.
Further, the software protection module 102 further includes: one end of the first capacitor C1, the first capacitor C1 is connected to the ADC port of the first controller U1, the other end of the first capacitor C1 is grounded, and the voltage signal output by the temperature detection module 101 is filtered through the first capacitor C1, so as to ensure the stability of the signal.
In another embodiment, the software protection module 102 includes: an AD conversion unit and a second controller (neither shown), wherein an input end of the AD conversion unit is connected with an output end of the temperature detection module 101; the acquisition port of the second controller is connected with the output end of the AD conversion unit, and the control port of the second controller is connected with the power supply switch U3.
That is, in the present application, the voltage signal output by the temperature detection module 101 may be converted into a digital signal by an ADC module built in the controller, or the voltage signal output by the temperature detection module 101 may be converted into a digital signal by an external AD conversion unit, so that the controller obtains and determines the temperature of the heating head based on the digital signal, thereby implementing the software over-temperature protection. For example, referring to fig. 1, when the resistance of the thermistor RT changes due to a temperature change of the heater head, the ADC port of the first controller U1 detects that the voltage at the output end of the temperature detection module 101 changes, and the temperature of the heater head can be obtained through conversion and compared with a preset temperature threshold, and if the temperature exceeds the preset temperature threshold, the control port, such as a GPIO interface, outputs a low-level signal to the power supply switch U3, so that the power supply switch U3 is in an off state to perform software over-temperature protection on the electronic device.
In one embodiment, as shown in fig. 1, the hardware protection module 103 includes: the circuit comprises a comparator U2, a reference voltage providing unit RV, a second resistor R2, a second capacitor C2 and a first switch tube Q1. The negative input end (-) of the comparator U2 is connected with the output end of the temperature detection module 101; the output end of the reference voltage providing unit RV is connected with the positive input (+) of the comparator U2; one end of a second resistor R2 is connected with the output end of the comparator U2, and the other end of the second resistor R2 is connected with a second preset power supply VCC 2; one end of a second capacitor C2 is connected with the other end of the second resistor R2, and the other end of the second capacitor C2 is grounded; the control terminal of the first switch tube Q1 is connected to the output terminal of the comparator U2, the first terminal of the first switch tube Q1 is connected to the power supply switch U3, and the second terminal of the first switch tube Q1 is grounded.
Specifically, when the voltage at the positive input terminal of the comparator U2 is greater than the voltage at the negative input terminal, that is, the voltage signal corresponding to the preset temperature threshold value provided by the reference voltage providing unit RV is greater than the voltage signal output by the temperature detecting module 101, the comparator U2 outputs a high level signal, and conversely, the comparator U2 outputs a low level signal. The first switch tube Q1 may be an NMOS tube, the G pole of the NMOS tube is connected to the output end of the comparator U2, the D pole is connected to the power supply switch U3, and the S pole is grounded, wherein when the voltage Vgs between the G pole and the S pole of the NMOS tube is greater than 0V, the NMOS tube is turned on; when the voltage Vgs between the G pole and the S pole of the NMOS tube is 0V, the NMOS tube is cut off. The POWER switch U3 may be a load switch with an enable signal, and as shown in fig. 2, the POWER _ EN signal is an enable signal for controlling the POWER switch U3, when the enable signal is a low level signal, the POWER switch U3 is in an off state, and the POWER supply VCC stops supplying POWER to the heat generating source, such as a heater head; when the enable signal is a high level signal, the power supply switch U3 is in a closed state, and the power supply VCC supplies power to the heat generating source, such as the heater head, through the power supply switch U3. Therefore, when the temperature of the heating head increases, the voltage signal at the output terminal of the temperature detection module 101 will decrease (the thermistor RT is an NTC resistor), and when it is lower than the voltage signal corresponding to the preset temperature threshold value provided by the reference voltage providing unit RV, the comparator U2 outputs a high level signal, the NMOS transistor is turned on, the power supply switch U3 receives a low level signal, the power supply switch U3 is in an off state, and the power supply VCC stops supplying power to the heating source, such as the heating head, so as to perform hardware over-temperature protection on the electronic device.
In one embodiment, as shown in fig. 1, the reference voltage providing unit RV may include: the circuit comprises a third resistor R3 and a fourth resistor R4, wherein one end of the third resistor R3 is connected with a third preset power supply VCC3, one end of the fourth resistor R4 is connected with the other end of the third resistor R3 and the positive input end of a comparator U2, and the other end of the fourth resistor R4 is grounded.
It should be understood that, the first resistor R1 and the thermistor RT are connected in parallel and then connected to the negative input terminal of the comparator U2, and the third resistor R3 and the fourth resistor R4 are connected in parallel and then connected to the positive input terminal of the comparator U2, the resistance values of the first resistor R1 and the third resistor R3 are kept consistent, and the resistance value of the fourth resistor R4 determines the preset temperature threshold of the hardware protection module 103, so that the resistance value of the fourth resistor R4 can be set according to the preset temperature threshold, and the temperature range of the thermistor RT can be selected according to actual requirements, as shown in table 1, wherein the resistance value of the thermistor RT (NTC resistor) is 30k at normal temperature.
TABLE 1
| Temperature/. degree.C | -10 | -5 | 0 | 5 | 10 | 15 | 20 | 25 |
| Resistance value/k omega | 175.07 | 132.29 | 100.99 | 77.85 | 60.57 | 47.53 | 37.61 | 30.00 |
| Temperature/. degree.C | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 |
| Resistance value/k omega | 24.11 | 19.51 | 15.89 | 13.03 | 10.75 | 8.92 | 7.45 | 6.25 |
| Temperature/. degree.C | 70 | 75 | 80 | 85 | 90 | 95 | 100 | |
| Resistance value/k omega | 5.27 | 4.47 | 3.80 | 3.25 | 2.79 | 2.41 | 2.09 |
Further, as a specific example, when the resistance value of the fourth resistor R4 is 3.6k, when the heating tip of the electronic device is at a normal temperature, the voltage signal at the negative input terminal of the comparator U2 is greater than the voltage signal at the positive input terminal, at this time, the output terminal OUT of the comparator U2 outputs a low level signal, the NMOS transistor is turned off, the enable signal of the power supply switch U3 is a high level signal, the power supply switch U3 is in a closed state, and the power supply VCC supplies power to the heating source, such as the heating tip, through the power supply switch U3. When the temperature rises to reduce the resistance of the thermistor RT (NTC resistor) to below 3.6K (it is shown from table 1 that when the temperature is 82 ℃ -83 ℃, the resistance of the thermistor RT is about 3.6K, that is, the preset temperature threshold of the heating head in the over-temperature protection circuit is 82 ℃ -83 ℃), the voltage signal of the negative input end of the comparator U2 is smaller than the voltage signal of the positive input end, at this time, the comparator U2 outputs a high level signal, the NMOS transistor is turned on, the enable signal of the power supply switch U3 is a low level signal, the power supply switch U3 is in an off state, and the power supply VCC stops supplying power to the heating source such as the heating head, thereby realizing the hardware over-temperature protection of the electronic device. In addition, as can also be seen from this example, the preset temperature threshold of the hardware over-temperature protection is determined by the resistance value of the fourth resistor R4, and the larger the resistance value is, the lower the temperature point of the over-temperature protection is; the smaller the resistance value, the higher the temperature point of the over-temperature protection.
As can be seen from the above, the temperature detection of the software is realized by the ADC port of the first controller U1 or the second controller and the ADC conversion unit, and the temperature detection of the hardware is realized by comparing the positive input terminal and the negative input terminal of the comparator U2. Meanwhile, the over-temperature protection of the software directly controls the power supply switch U3, while the over-temperature protection of the hardware controls the first switch tube Q1, and when the first switch tube Q1 is in the off state, the enable signal of the power supply switch U3 is at a high level, and when the first switch tube Q1 is in the on state, the enable signal of the power supply switch U3 is at a low level. Therefore, the over-temperature protection circuit 100 realizes the functions of simultaneous temperature detection and over-temperature protection of software and hardware. Wherein, if the software of controller appears unusually if the condition of running to death, when leading to the controller can't carry out temperature detection and excess temperature control, will make no matter how high the temperature of heating head rises, the control port of controller all maintains at the high level, power supply switch U3 is in the conducting state always, it is likely to lead to the temperature to rise constantly and to appear the device damage even the accident to continue to take place, and in this application, because the detection circuitry of hardware has been increased, consequently when the temperature is too high, comparator U2 will output the high level signal, make first switch tube Q1 conduct, power supply switch U3 receives the low level signal, power supply switch U3 is in the disconnect state, prevent to continue to supply power for the heating head and heat the intensification and lead to the damage.
In one embodiment, as shown in fig. 3, the power switch U3 may include a second switch Q2 and a third switch Q3, a first end of the second switch Q2 is connected to the power supply VCC of the heater head, a second end of the second switch Q2 is connected to the power supply VPOWER of the heater head, and a control end of the second switch Q2 is connected to the output end of the software protection module 102 and the output end of the hardware protection module 103, respectively; a first end of the third switching tube Q3 is connected to a second end of the second switching tube Q2, a second end of the third switching tube Q3 is grounded, and a control end of the third switching tube Q3 is connected to an output end of the software protection module 102 and an output end of the hardware protection module 103, respectively.
In this example, when the enable signal, POWER _ EN, of the POWER switch U3 is a low level signal, the second switch Q2 is in an off state, the third switch Q3 is in an on state, and the POWER supply stops supplying POWER to the heat generating source, such as a heating head, while performing rapid discharge through the third switch Q3; when the enable signal of the POWER switch U3, that is, POWER _ EN, is a high level signal, the second switch Q2 is in a conducting state, the third switch Q3 is in a disconnecting state, and the POWER supply VCC supplies POWER to a heat source such as a heating head through the POWER switch U3. Therefore, the power supply switch can realize on-off control of the power supply loop.
In summary, according to the over-temperature protection circuit of the electronic device in the embodiment of the present invention, the input end of the software protection module and the input end of the hardware protection module are both connected to the output end of the temperature detection module, the output end of the software protection module and the output end of the hardware protection module are both connected to the power supply switch of the heating head of the electronic device, the temperature detection module senses the temperature of the heating head and outputs a voltage signal corresponding to the temperature, the software protection module controls the operating state of the power supply switch according to the voltage signal to perform software over-temperature protection, and the hardware protection module triggers the power supply switch to operate according to the voltage signal to perform hardware over-temperature protection. Therefore, even if the software is abnormal and cannot be detected and judged, the hardware protection module can take effect in time and compares the abnormal with a preset threshold value of the hardware to judge whether the over-temperature problem exists or not, and if the abnormal heating occurs, the power supply circuit can be cut off in time to prevent the over-temperature problem. The over-temperature protection circuit of the electronic equipment can realize synchronous over-temperature protection of software and hardware, can provide double guarantees and improves the reliability of the over-temperature protection.
FIG. 4 is a schematic diagram of an electronic device according to one embodiment of the utility model. Referring to fig. 4, the electronic device 1000 includes the over-temperature protection circuit 100 of the electronic device.
According to the electronic equipment provided by the embodiment of the utility model, through the over-temperature protection circuit of the electronic equipment, even if software is abnormal and cannot be detected and judged, the hardware protection module can take effect in time and is compared with a threshold value preset by hardware to judge whether an over-temperature problem exists or not, and if abnormal heating occurs, the power supply circuit can be cut off in time to prevent the over-temperature problem from occurring. The electronic equipment provided by the embodiment of the utility model can realize the synchronous over-temperature protection of software and hardware, can provide double guarantees, and improves the reliability of the over-temperature protection.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; 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 meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. An over-temperature protection circuit for an electronic device, comprising: the temperature detection device comprises a temperature detection module, a software protection module and a hardware protection module, wherein the input end of the software protection module and the input end of the hardware protection module are connected with the output end of the temperature detection module, and the output end of the software protection module and the output end of the hardware protection module are connected with a power supply switch of a heating head of the electronic equipment;
the temperature detection module is used for sensing the temperature of the heating head and outputting a voltage signal corresponding to the temperature;
the software protection module is used for obtaining the temperature of the heating head according to the voltage signal and controlling the power supply switch to be switched off to perform software over-temperature protection when the temperature exceeds a preset temperature threshold value;
the hardware protection module is used for triggering the power supply switch to be switched off when the voltage signal exceeds the voltage signal corresponding to the preset temperature threshold value so as to perform hardware over-temperature protection; the hardware protection module comprises: the negative input end of the comparator is connected with the output end of the temperature detection module; the output end of the reference voltage providing unit is connected with the positive input end of the comparator; the control end of the first switch tube is connected with the output end of the comparator, the first end of the first switch tube is connected with the power supply switch, and the second end of the first switch tube is grounded.
2. The over-temperature protection circuit of an electronic device according to claim 1, wherein the temperature detection module comprises:
one end of the first resistor is connected with a first preset power supply;
and one end of the thermistor is respectively connected with the other end of the first resistor and the output end of the temperature detection module, and the other end of the thermistor is grounded.
3. The over-temperature protection circuit for an electronic device according to claim 2, wherein the thermistor is a negative temperature coefficient thermistor.
4. The over-temperature protection circuit of an electronic device according to claim 1, wherein the software protection module comprises: and an ADC port of the first controller is connected with the output end of the temperature detection module, and a control port of the first controller is connected with the power supply switch.
5. The over-temperature protection circuit of an electronic device of claim 4, wherein the software protection module further comprises: and one end of the first capacitor is connected with the ADC port of the first controller, and the other end of the first capacitor is grounded.
6. The over-temperature protection circuit of an electronic device according to claim 1, wherein the software protection module comprises:
the input end of the AD conversion unit is connected with the output end of the temperature detection module;
and the acquisition port of the second controller is connected with the output end of the AD conversion unit, and the control port of the second controller is connected with the power supply switch.
7. The over-temperature protection circuit of an electronic device of claim 1, wherein the hardware protection module further comprises:
one end of the second resistor is connected with the output end of the comparator, and the other end of the second resistor is connected with a second preset power supply;
and one end of the second capacitor is connected with the other end of the second resistor, and the other end of the second capacitor is grounded.
8. The over-temperature protection circuit of an electronic device according to claim 7, wherein the reference voltage providing unit includes:
one end of the third resistor is connected with a third preset power supply;
and one end of the fourth resistor is respectively connected with the other end of the third resistor and the positive input end of the comparator, and the other end of the fourth resistor is grounded.
9. The over-temperature protection circuit of an electronic device according to claim 1, wherein the power supply switch comprises:
a first end of the second switching tube is connected with a power supply of the heating head, a second end of the second switching tube is connected with a power supply end of the heating head, and a control end of the second switching tube is respectively connected with an output end of the software protection module and an output end of the hardware protection module;
and the first end of the third switching tube is connected with the second end of the second switching tube, the second end of the third switching tube is grounded, and the control end of the third switching tube is respectively connected with the output end of the software protection module and the output end of the hardware protection module.
10. An electronic device characterized by comprising the over-temperature protection circuit of the electronic device according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120090605.XU CN215601022U (en) | 2021-01-13 | 2021-01-13 | Electronic equipment and over-temperature protection circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120090605.XU CN215601022U (en) | 2021-01-13 | 2021-01-13 | Electronic equipment and over-temperature protection circuit thereof |
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| Publication Number | Publication Date |
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| CN215601022U true CN215601022U (en) | 2022-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120090605.XU Active CN215601022U (en) | 2021-01-13 | 2021-01-13 | Electronic equipment and over-temperature protection circuit thereof |
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| CN (1) | CN215601022U (en) |
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