CN112271696A - Over-temperature protection circuit and method for electronic equipment and electronic equipment - Google Patents
Over-temperature protection circuit and method for electronic equipment and electronic equipment Download PDFInfo
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- CN112271696A CN112271696A CN202011095869.0A CN202011095869A CN112271696A CN 112271696 A CN112271696 A CN 112271696A CN 202011095869 A CN202011095869 A CN 202011095869A CN 112271696 A CN112271696 A CN 112271696A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/042—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using temperature dependent resistors
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Abstract
The invention provides an over-temperature protection circuit of electronic equipment, which comprises a heating element, a sensing module, a switch module and a control module, wherein the heating element is arranged on the sensing module; the heating element is connected with a first end of the switch module, a second end of the switch module is connected with an external interface of electronic equipment, a third end of the switch module is connected with a first end of the control module, one end of the sensing module is connected with a second end of the control module, and the other end of the sensing module is grounded; the sensing module is disposed proximate to the heating element, and the sensing module is configured to sense a temperature of the heating element. The invention also provides an over-temperature protection method of the electronic equipment and the electronic equipment. The over-temperature protection circuit and method of the electronic equipment and the electronic equipment provided by the invention realize the over-temperature protection function when the external interface is connected to the non-standard external equipment, and avoid the problem of element burnout caused by the temperature rise of the heating element.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of over-temperature protection, in particular to an over-temperature protection circuit and method for electronic equipment and the electronic equipment.
[ background of the invention ]
At present, in-process at electronic equipment use, when the accessory that inserts nonstandard, can arouse that internal circuit exceeds specification work, lead to circuit element to generate heat gradually, even burn out. In the existing circuit design, a TVS (transient diode) is usually added to protect a circuit, and the TVS can only realize overvoltage and overcurrent protection, but cannot avoid the problem that circuit elements are burnt due to the fact that the temperature of the circuit is increased due to the fact that an irregular accessory is connected.
In view of the above, it is desirable to provide a novel over-temperature protection circuit for an electronic device, a method thereof and an electronic device to overcome the above-mentioned drawbacks.
[ summary of the invention ]
The invention aims to provide an over-temperature protection circuit and method of electronic equipment and the electronic equipment, which realize the over-temperature protection function when an external interface is connected to the non-standard external equipment and avoid the problem of element burning caused by the temperature rise of a heating element.
In order to achieve the above object, in a first aspect, the present invention provides an over-temperature protection circuit for an electronic device, including a heating element, a sensing module, a switch module and a control module; the heating element is connected with a first end of the switch module, a second end of the switch module is connected with an external interface of electronic equipment, a third end of the switch module is connected with a first end of the control module, one end of the sensing module is connected with a second end of the control module, and the other end of the sensing module is grounded; the sensing module is arranged close to the heating element and is used for sensing the temperature of the heating element; when the external interface is inserted into an external device and the heating element is communicated with the external device, the sensing module transmits the sensed current temperature of the heating element to the control module, and the control module detects whether the current temperature exceeds a preset temperature threshold value every preset time period; when the current temperature is higher than the preset temperature threshold value, the control module sends a disconnected control signal to the switch module, and the switch module is disconnected.
In a preferred embodiment, the control module is further configured to send a communication control signal to the switch module when the external interface is inserted into an external device, the heating element is disconnected from the external device, and the current temperature is less than or equal to the preset temperature threshold, and the switch module is communicated.
In a preferred embodiment, the switch module is a switch chip, a common pin of the switch chip is a first end of the switch module, a normally-closed pin of the switch chip is a second end of the switch module, and an enable pin of the switch chip is a third end of the switch module.
In a preferred embodiment, the control module is a CPU, a control pin of the CPU is a first end of the control module, and a detection pin of the CPU is a second end of the control module.
In a preferred embodiment, the heating element includes a first magnetic bead, a second magnetic bead, and a third magnetic bead, and the sensing module includes a first thermistor, a second thermistor, and a third thermistor; the first thermistor is arranged close to the first magnetic bead, the second thermistor is arranged close to the second magnetic bead, and the third thermistor is arranged close to the third magnetic bead.
In a preferred embodiment, the detection pins include a first detection pin, a second detection pin and a third detection pin, one end of the first thermistor is connected to the first detection pin, one end of the second thermistor is connected to the second detection pin, and one end of the third thermistor is connected to the third detection pin.
In a preferred embodiment, the common pins include a first common pin, a second common pin, and a third common pin; the first end of the first magnetic bead is connected with the first public pin, the first end of the second magnetic bead is connected with the second public pin, and the first end of the third magnetic bead is connected with the third public pin.
In a preferred embodiment, the second end of the first magnetic bead, the second end of the second magnetic bead, and the second end of the third magnetic bead are connected to an audio output chip, and the second end of the third magnetic bead is further grounded through a TVS tube.
In a second aspect, the present invention further provides an over-temperature protection method for electronic equipment, including the following steps: the sensing module senses the current temperature of the heating element and sends the current temperature to the control module; when the external interface is inserted into the external equipment, the control module detects the current temperature, and when the current temperature is less than or equal to a preset temperature threshold value, the control module controls the switch module to be communicated, so that the heating element is communicated with the external equipment; after the heating element is communicated with the external equipment, the control module detects the current temperature every other preset time period, and controls the switch module to be disconnected when the current temperature is greater than the preset temperature threshold value, so that the heating element is disconnected with the external equipment.
In a third aspect, the present invention further provides an electronic device, including the over-temperature protection circuit of the electronic device according to any one of the above embodiments.
Compared with the prior art, the over-temperature protection circuit and the over-temperature protection method for the electronic equipment and the electronic equipment provided by the invention, by connecting the switch module between the heating element and the external interface and arranging the sensing module at the position close to the heating element, the sensing module is used for sensing the temperature of the heating element, and the sensing module and the switch module are both connected with the control module, when the external interface is inserted into the external equipment and the heating element is communicated with the external equipment, the control module can control the working state of the switch module according to the current temperature of the heating element sensed by the sensing module, if the current temperature is greater than the preset temperature threshold value, the control module controls the switch module to be switched off, and then the heating element is disconnected with the external equipment, so that the over-temperature protection function when the external interface is connected to the non-standard external equipment is realized, and the problem that the element is burnt due to the temperature rise of the heating element is avoided.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic block diagram of an over-temperature protection circuit of an electronic device according to the present invention;
FIG. 2 is a circuit diagram of an over-temperature protection circuit of an electronic device according to the present invention;
fig. 3 is a flowchart of an over-temperature protection method for an electronic device according to the present invention.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides an over-temperature protection circuit 100 for an electronic device, which includes a heating element 10, a sensing module 20, a switch module 30 and a control module 40.
The heating element 10 is connected to the first end of the switch module 20, the second end of the switch module 20 is connected to the external interface 101 of the electronic device, the third end of the switch module 20 is connected to the first end of the control module 40, one end of the sensing module 20 is connected to the second end of the control module 40, and the other end of the sensing module 20 is grounded. Specifically, the sensing module 20 is disposed near the heating element 10, and the sensing module 20 is used for sensing the temperature of the heating element 10.
When the external interface 101 is inserted into an external device and the heating element 10 is communicated with the external device (i.e., the switch module 30 is communicated), the sensing module 20 transmits the sensed current temperature of the heating element 10 to the control module 40, and the control module 40 detects whether the current temperature exceeds a preset temperature threshold value every preset time period; when the current temperature is higher than the preset temperature threshold, the control module 40 sends a disconnection control signal to the switch module 30, and the switch module 30 is disconnected, so that the heating element 10 is disconnected from the external device 101. It can be understood that, when the external interface 101 is inserted into the external device and the heating element 10 is communicated with the external device, and the current temperature is less than or equal to the preset temperature threshold, the control module 40 does not send the control signal, the heating element 10 is communicated with the external device, and the external device normally operates.
Therefore, the over-temperature protection circuit 100 of the electronic device according to the present invention is provided with a switch module 30 connected between the heat generating element 10 and the external interface 101, and a sensing module 20 is disposed at a position close to the heating element 10, the sensing module 20 is used for sensing the temperature of the heating element 10, and the sensing module 20 and the switch module 30 are both connected to the control module 40, when the external interface 101 is inserted into the external device and the heating element 10 is connected to the external device, the control module 40 can control the operating state of the switch module 30 according to the current temperature of the heating element 10 sensed by the sensing module 20, if the current temperature is greater than the preset temperature threshold, the control module 40 controls the switch module 30 to be turned off, and then the heating element 10 is disconnected with the external equipment 101, so that the over-temperature protection function is realized when the external interface 101 is connected to the external equipment without specification, and the problem that the element is burnt due to the temperature rise of the heating element 10 is avoided.
Further, the control module 40 is further configured to send a connected control signal to the switch module 30 when the external interface 101 is inserted into the external device and the heating element 10 is disconnected from the external device (i.e., the switch module 30 is disconnected), and the current temperature is less than or equal to the preset temperature threshold, and the switch module 30 is connected, so that the heating element 10 is connected with the external device 101, and the external device works normally. It can be understood that, when the external interface 101 is inserted into the external device and the heating element 10 is disconnected from the external device, and the current temperature is greater than the preset temperature threshold, the control module 40 does not send the control signal, the heating element 10 and the external device are kept disconnected, and the external device does not operate.
Referring to fig. 2, in the present embodiment, the heating element 10 includes a first magnetic bead L1, a second magnetic bead L2, and a third magnetic bead L3, and the sensing module 20 includes a first thermistor R1, a second thermistor R2, and a third thermistor R3. Specifically, the first thermistor R1 is disposed close to the first magnetic bead L1, the second thermistor R2 is disposed close to the second magnetic bead L2, the third thermistor R3 is disposed close to the third magnetic bead L3, and the first thermistor R1, the second thermistor R2, and the third thermistor R3 are respectively used for sensing the temperatures of the first magnetic bead L1, the second magnetic bead L2, and the third magnetic bead L3.
Further, the switch module 30 is a switch chip U1, a common pin of the switch chip U1 is a first end of the switch module 30, a normally closed pin of the switch chip U1 is a second end of the switch module 30, and an enable pin EN of the switch chip U1 is a third end of the switch module 30.
Specifically, the common pin of the switch chip U1 includes a first common pin COM1, a second common pin COM2, and a third common pin COM 3. The first end of the first magnetic bead L1 is connected with the first common pin COM1, the first end of the second magnetic bead L2 is connected with the second common pin COM2, the first end of the third magnetic bead is connected with the third common pin COM3, and the second end of the first magnetic bead L1, the second end of the second magnetic bead L2 and the second end of the third magnetic bead L3 are further connected with the audio output chip. It can be understood that when the external interface 101 is connected to the external device and the switch chip U1 is connected, the audio output chip outputs audio from the external device through the three magnetic beads, the switch chip U1 and the external interface 101. The external device may be, for example, a sound box or an earphone, and the three magnetic beads are used for eliminating electromagnetic waves of a specific interference frequency in the audio signal through heat loss. The second end of the third magnetic bead L3 is also connected with the TVS tube D and then grounded, and the TVS tube D is used for realizing overvoltage and overcurrent protection of the circuit.
In this embodiment, the normally closed pins of the switch chip U1 include a first normally closed pin NC1, a second normally closed pin NC2, and a third normally closed pin NC3, and all of the three normally closed pins are connected to the external interface 101. Switch chip U1 also includes supply pin VCC, and supply pin VCC is used for connecting system power VSYS to realize switch chip U1's power supply.
Further, the control module 40 is a Central Processing Unit (CPU), a control pin CTRL of the CPU is a first end of the control module 40, and a detection pin of the CPU is a second end of the control module CPU. Specifically, the detection pins of the CPU include a first detection pin ADC1, a second detection pin ADC2 and a third detection pin ADC3, one end of the first thermistor R1 is connected to the first detection pin ADC1, one end of the second thermistor R2 is connected to the second detection pin ADC2, one end of the third thermistor R2 is connected to the third detection pin ADC3, and the other ends of the first thermistor R1, the second thermistor R2 and the third thermistor R3 are all grounded.
The principle of the over-temperature protection circuit 100 of the electronic device shown in fig. 2 is as follows: when the external device is inserted into the external interface 101 and the initial operating state of the switch chip U1 is on, the first thermistor R1, the second thermistor R2 and the third thermistor R3 transmit the sensed current temperatures of the first magnetic bead L1, the second magnetic bead L2 and the third magnetic bead L3 to the first detection pin ADC1, the second detection pin ADC2 and the third detection pin ADC3 of the CPU, the CPU detects whether the current temperature exceeds a preset temperature threshold value every preset time period, and when the current temperature is greater than the preset temperature threshold value, the control pin CTRL of the CPU sends a disconnected control signal (low level signal) to the enable pin EN of the switch chip U1, the switch chip U1 stops operating, and the heating element 10 is disconnected from the external device 101. It can be understood that, if the initial operating state of the switch chip U1 is "on" and the current temperature is less than or equal to the preset temperature threshold, the control pin CTRL of the CPU does not send a control signal, the heating element 10 and the external device are kept "on" and the external device operates normally.
Further, when the external device 101 is inserted into the external device, the switch chip U1 is in the off state in the initial working state, and the current temperature is less than or equal to the preset temperature threshold, the control pin CTRL of the CPU sends a connected control signal (high level signal) to the switch chip U1, and the switch chip U1 is connected, so that the heating element 10 is connected to the external device 101, and the external device normally works. It can be understood that when the external device is inserted into the external interface 101, the initial operating state of the switch chip U1 is off, and the current temperature is greater than the preset temperature threshold, the control pin CTRL of the CPU does not send a control signal, the heating element 10 remains off from the external device, and the external device does not operate.
Referring to fig. 3, the present invention further provides an over-temperature protection method for an electronic device, including the following steps:
step S10: the sensing module senses the current temperature of the heating element and transmits the current temperature to the control module. Specifically, the sensing module is arranged close to the heating element, one end of the sensing module is connected with the control module, and the sensing module can sense the current temperature of the heating element and transmit the current temperature to the control module.
Step S20: when the external interface is inserted into the external equipment, the control module detects the current temperature, and when the current temperature is less than or equal to a preset temperature threshold value, the control switch module is communicated, so that the heating element is communicated with the external equipment. That is, after the external interface is connected to the external device, it is first detected whether the current temperature exceeds a preset temperature threshold, and if so, the switch module is controlled to be disconnected, so that the heating element is disconnected from the external device. Specifically, the heating element is connected with the first end of the switch module, the second end of the switch module is connected with the external interface, the third end of the switch module is connected with the control module, and the control module can control the connection or disconnection of the switch module, so that the connection or disconnection of the heating element and the external equipment is realized.
Step S30: after the heating element is communicated with the external equipment, the control module detects the current temperature every other preset time period, and controls the switch module to be disconnected when the current temperature is greater than the preset temperature threshold value, so that the heating element is disconnected with the external equipment. It can be understood that if the current temperature is less than or equal to the preset temperature threshold, the switch module keeps the connected working state, and the external equipment works normally.
The invention also provides an electronic device comprising the over-temperature protection circuit 100 of any one of the electronic devices. It is understood that the electronic device may be, but is not limited to, a terminal such as a mobile phone, a tablet computer, a notebook computer, etc., and the electronic device includes an external interface 101 capable of accessing to an external device.
It should be noted that all embodiments of the over-temperature protection circuit 100 of the electronic device provided by the present invention are applicable to the electronic device using the over-temperature protection method of the electronic device provided by the present invention, and can achieve the same or similar beneficial effects.
In summary, according to the over-temperature protection circuit 100, the method and the electronic device of the electronic device provided by the present invention, the switch module 30 is connected between the heating element 10 and the external interface 101, the sensing module 20 is disposed at a position close to the heating element 10, the sensing module 20 is used for sensing the temperature of the heating element 10, and both the sensing module 20 and the switch module 30 are connected to the control module 40, when the external interface 101 is inserted into the external device and the heating element 10 is connected to the external device, the control module 40 can control the working state of the switch module 30 according to the current temperature of the heating element 10 sensed by the sensing module 20, if the current temperature is greater than the preset temperature threshold, the control module 40 controls the switch module 30 to be disconnected, so that the heating element 10 is disconnected from the external device 101, thereby realizing the over-temperature protection function when the external interface 101 is connected to an external device without specification, the problem of component burnout due to the temperature rise of the heating component 10 is avoided.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An over-temperature protection circuit of electronic equipment is characterized by comprising a heating element, a sensing module, a switch module and a control module; the heating element is connected with a first end of the switch module, a second end of the switch module is connected with an external interface of electronic equipment, a third end of the switch module is connected with a first end of the control module, one end of the sensing module is connected with a second end of the control module, and the other end of the sensing module is grounded; the sensing module is arranged close to the heating element and is used for sensing the temperature of the heating element;
when the external interface is inserted into an external device and the heating element is communicated with the external device, the sensing module transmits the sensed current temperature of the heating element to the control module, and the control module detects whether the current temperature exceeds a preset temperature threshold value every preset time period; when the current temperature is higher than the preset temperature threshold value, the control module sends a disconnected control signal to the switch module, and the switch module is disconnected.
2. The over-temperature protection circuit of electronic equipment according to claim 1, wherein the control module is further configured to send a connection control signal to the switch module when the external interface is plugged into an external device and the heating element is disconnected from the external device, and the current temperature is less than or equal to the preset temperature threshold, and the switch module is connected.
3. The over-temperature protection circuit of an electronic device according to claim 1, wherein the switch module is a switch chip, a common pin of the switch chip is a first terminal of the switch module, a normally-closed pin of the switch chip is a second terminal of the switch module, and an enable pin of the switch chip is a third terminal of the switch module.
4. The over-temperature protection circuit of an electronic device according to claim 3, wherein the control module is a CPU, a control pin of the CPU is a first end of the control module, and a detection pin of the CPU is a second end of the control module.
5. The over-temperature protection circuit of claim 4, wherein the heating element comprises a first magnetic bead, a second magnetic bead, and a third magnetic bead, and the sensing module comprises a first thermistor, a second thermistor, and a third thermistor; the first thermistor is arranged close to the first magnetic bead, the second thermistor is arranged close to the second magnetic bead, and the third thermistor is arranged close to the third magnetic bead.
6. The over-temperature protection circuit of an electronic device according to claim 5, wherein the detection pin comprises a first detection pin, a second detection pin and a third detection pin, one end of the first thermistor is connected to the first detection pin, one end of the second thermistor is connected to the second detection pin, and one end of the third thermistor is connected to the third detection pin.
7. The over-temperature protection circuit of an electronic device according to claim 5, wherein the common pin comprises a first common pin, a second common pin, and a third common pin; the first end of the first magnetic bead is connected with the first public pin, the first end of the second magnetic bead is connected with the second public pin, and the first end of the third magnetic bead is connected with the third public pin.
8. The over-temperature protection circuit of an electronic device according to claim 5, wherein a second end of the first magnetic bead, a second end of the second magnetic bead, and a second end of the third magnetic bead are connected to an audio output chip, and a second end of the third magnetic bead is further grounded through a TVS tube.
9. An over-temperature protection method of electronic equipment is characterized by comprising the following steps:
the sensing module senses the current temperature of the heating element and sends the current temperature to the control module;
when the external interface is inserted into the external equipment, the control module detects the current temperature, and when the current temperature is less than or equal to a preset temperature threshold value, the control module controls the switch module to be communicated, so that the heating element is communicated with the external equipment;
after the heating element is communicated with the external equipment, the control module detects the current temperature every other preset time period, and controls the switch module to be disconnected when the current temperature is greater than the preset temperature threshold value, so that the heating element is disconnected with the external equipment.
10. An electronic device comprising the over-temperature protection circuit of the electronic device according to any one of claims 1 to 8.
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| CN202011095869.0A CN112271696B (en) | 2020-10-14 | 2020-10-14 | Over-temperature protection circuit and method of electronic equipment and electronic equipment |
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| CN202011095869.0A CN112271696B (en) | 2020-10-14 | 2020-10-14 | Over-temperature protection circuit and method of electronic equipment and electronic equipment |
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| US20100315752A1 (en) * | 2009-06-15 | 2010-12-16 | Stanley Rabu | Thermal protection circuits and structures for electronic devices and cables |
| CN204030555U (en) * | 2014-07-16 | 2014-12-17 | 普联技术有限公司 | The high-frequency circuit of a kind of magnetic bead protective circuit and electromagnetism interference |
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