CN112271696B - Over-temperature protection circuit and method of electronic equipment and electronic equipment - Google Patents
Over-temperature protection circuit and method of electronic equipment and electronic equipment Download PDFInfo
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- CN112271696B CN112271696B CN202011095869.0A CN202011095869A CN112271696B CN 112271696 B CN112271696 B CN 112271696B CN 202011095869 A CN202011095869 A CN 202011095869A CN 112271696 B CN112271696 B CN 112271696B
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- 230000001052 transient effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 description 5
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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; the heating element is connected with the first end of the switch module, the second end of the switch module is connected with an external interface of the electronic equipment, the third end of the switch module is connected with the first end of the control module, one end of the sensing module is connected with the 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. The invention also provides an over-temperature protection method of the electronic equipment and the electronic equipment. The over-temperature protection circuit and method for the electronic equipment and the electronic equipment provided by the invention realize the over-temperature protection function when the external interface is connected with the external equipment which is not standardized, and avoid the problem of element burnout caused by the temperature rise of the heating element.
Description
[ field of technology ]
The present invention relates to the field of over-temperature protection technologies, and in particular, to an over-temperature protection circuit and method for an electronic device, and an electronic device.
[ background Art ]
At present, when an irregular accessory is connected in the using process of the electronic equipment, the internal circuit is caused to work in an over-specification mode, so that the circuit element is gradually heated and even burnt. In the existing circuit design, a TVS (transient diode) is added to protect a circuit, and the TVS can only realize overvoltage and overcurrent protection, but the problem that circuit elements burn out due to the fact that the temperature of the circuit is increased caused by the fact that irregular accessories are connected cannot be avoided.
In view of the foregoing, it is desirable to provide a novel over-temperature protection circuit and method for an electronic device, and an electronic device for overcoming the above-mentioned drawbacks.
[ 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 with an irregular 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 of an electronic device, including a heating element, a sensing module, a switch module and a control module; the heating element is connected with the first end of the switch module, the second end of the switch module is connected with an external interface of the electronic equipment, the third end of the switch module is connected with the first end of the control module, one end of the sensing module is connected with the 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 or not every preset time period; when the current temperature is greater than the preset temperature threshold, the control module sends an off control signal to the switch module, and the switch module is turned off.
In a preferred embodiment, the control module is further configured to send a control signal for communication 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 communicated.
In a preferred embodiment, the switch module is a switch chip, the common pin of the switch chip is a first end of the switch module, the normally closed pin of the switch chip is a second end of the switch module, and the 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 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 beads, the second thermistor is arranged close to the second magnetic beads, and the third thermistor is arranged close to the third magnetic beads.
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 common pin, the first end of the second magnetic bead is connected with the second common pin, and the first end of the third magnetic bead is connected with the third common 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 grounded through a TVS.
In a second aspect, the present invention also provides an over-temperature protection method for an electronic device, 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 connection interface is inserted into external connection equipment, the control module detects the current temperature, and when the current temperature is smaller 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 connection equipment; after the heating element is communicated with the external equipment, the control module detects the current temperature every preset time period, and when the current temperature is greater than the preset temperature threshold value, the switch module is controlled to be disconnected, so that the heating element is disconnected with the external equipment.
In a third aspect, the present invention further provides an electronic device, including an over-temperature protection circuit of the electronic device according to any one of the foregoing embodiments.
Compared with the prior art, the over-temperature protection circuit and method for the electronic equipment and the electronic equipment are characterized in that the switch module is connected between the heating element and the external interface, the sensing module is arranged at the position close to the heating element and is used for sensing the temperature of the heating element, 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, and if the current temperature is greater than the preset temperature threshold, the control module controls the switch module to be disconnected, so that the heating element is disconnected with the external equipment, the over-temperature protection function when the external interface is connected with the external equipment in an irregular manner is realized, and the problem that the heating element is burnt out due to the temperature rise of the heating element is avoided.
In order to make the above objects, features and advantages of the present invention more 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 that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic block diagram of an overheat protection circuit of an electronic device provided by 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 provided by the present invention.
[ detailed description ] of the invention
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The components of the 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 invention, as 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 made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
Referring to fig. 1, the present invention provides an over-temperature protection circuit 100 of 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 with a first end of the switch module 20, a second end of the switch module 20 is connected with an external interface 101 of the electronic device, a third end of the switch module 20 is connected with a first end of the control module 40, one end of the sensing module 20 is connected with a 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 plugged 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 greater than the preset temperature threshold, the control module 40 sends an off control signal to the switch module 30, and the switch module 30 is turned off, 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 out a control signal, the heating element 10 is kept communicated with the external device, and the external device works normally.
Therefore, in the over-temperature protection circuit 100 of the electronic device provided by the invention, the switch module 30 is connected between the heating element 10 and the external interface 101, and the sensing module 20 is arranged 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 with the control module 40, when the external interface 101 is inserted into the external device and the heating element 10 is communicated with 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, and 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 into the non-standard external device, and avoiding the problem of burning of the element due to the temperature rise of the heating element 10.
Further, the control module 40 is further configured to, 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), send a control signal to the switch module 30 when 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 plugged 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 a control signal, the heating element 10 is kept disconnected from the external device, and the external device does not work.
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 close to the first magnetic bead L1, the second thermistor R2 is close to the second magnetic bead L2, the third thermistor R3 is 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 pins of the switch chip U1 include a first common pin COM1, a second common pin COM2, and a third common pin COM3. The first end of the first magnetic bead L1 is connected with the first public pin COM1, the first end of the second magnetic bead L2 is connected with the second public pin COM2, the first end of the third magnetic bead is connected with the third public 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 also connected with an 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 through the three magnetic beads, the switch chip U1 and the external interface 101. The external device can be, for example, a sound box or an earphone, and the three magnetic beads are used for eliminating electromagnetic waves with specific interference frequencies in the audio signal through heat loss. The second end of the third magnetic bead L3 is also connected with a TVS tube D and then grounded, and the TVS tube D is used for realizing overvoltage and overcurrent protection of a 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 the three normally-closed pins are connected to the external connection interface 101. The switch chip U1 further includes a power supply pin VCC, where the power supply pin VCC is used to connect to a system power supply VSYS to realize power supply of the switch chip U1.
Further, the control module 40 is a CPU (Central Processing Unit ), 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 pin of CPU includes first detection pin ADC1, second detection pin ADC2 and third detection pin ADC3, and first detection pin ADC1 is connected to first thermistor R1's one end, and second detection pin ADC2 is connected to second thermistor R2's one end, and third detection pin ADC3 is connected to third thermistor R2's one end, and first thermistor R1, second thermistor R2 and third thermistor R3's the other end all ground connection.
The principle of the over-temperature protection circuit 100 of the electronic device shown in fig. 2 is as follows: when the external interface 101 is plugged into an external device and the initial working state of the switch chip U1 is communication, the first thermistor R1, the second thermistor R2 and the third thermistor R3 transmit the 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 an off control signal (low level signal) to the enable pin EN of the switch chip U1, the switch chip U1 stops working, and further the disconnection of the heating element 10 from the external device 101 is realized. It can be understood that if the initial working state of the switch chip U1 is communication, 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 is kept in communication with the external device, and the external device works normally.
Further, when the external interface 101 is inserted into the external device and the initial working state of the switch chip U1 is off, and the current temperature is less than or equal to the preset temperature threshold, the control pin CTRL of the CPU sends a 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 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 initial working 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 is kept disconnected from the external device, and the external device does not work.
Referring to fig. 3, the invention also provides an over-temperature protection method of the electronic device, which comprises 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 connection interface is inserted into external connection equipment, the control module detects the current temperature, and when the current temperature is smaller 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 connection equipment. After the external interface is connected with the external device, whether the current temperature exceeds a preset temperature threshold is detected, if so, the control switch module is disconnected, and then the heating element is disconnected with 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 external equipment is realized.
Step S30: after the heating element is communicated with the external equipment, the control module detects the current temperature every preset time period, and when the current temperature is greater than the preset temperature threshold value, the switch module is controlled to be disconnected, 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 maintains the working state of communication, 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 not limited to, a mobile phone, a tablet computer, a notebook computer, etc., and the electronic device includes an external interface 101, which can be connected to the 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 of the over-temperature protection method of the electronic device provided by the present invention, and the same or similar beneficial effects can be achieved.
In summary, according to the over-temperature protection circuit 100, the method and the electronic device of the electronic device provided by the invention, the switch module 30 is connected between the heating element 10 and the external interface 101, and the sensing module 20 is arranged 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 with the control module 40, when the external interface 101 is inserted into the external device and the heating element 10 is communicated with 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 into the external device without specification, and avoiding the problem of element burnout caused by the temperature rise of the heating element 10.
The foregoing description is only of embodiments of the present invention, and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (7)
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 the first end of the switch module, the second end of the switch module is connected with an external interface of the electronic equipment, the third end of the switch module is connected with the first end of the control module, one end of the sensing module is connected with the second end of the control module, and the other end of the sensing module is grounded; the switch module is connected between the heating element and the external interface, the sensing module is arranged close to the heating element, and the sensing module 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 or not every preset time period; when the current temperature is greater than the preset temperature threshold, the control module sends an off control signal to the switch module, and the switch module is turned off;
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 beads, the second thermistor is arranged close to the second magnetic beads, and the third thermistor is arranged close to the third magnetic beads;
the switch module is a switch chip, and a common pin of the switch chip is a first end of the switch module; the common pins comprise 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 common pin, the first end of the second magnetic bead is connected with the second common pin, and the first end of the third magnetic bead is connected with the third common pin; the second ends of the first magnetic beads, the second ends of the second magnetic beads and the second ends of the third magnetic beads are connected with an audio output chip, and the second ends of the third magnetic beads are grounded through a TVS (transient voltage suppressor).
2. The overheat protection circuit of claim 1, wherein the control module is further configured to send a 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 claim 1, wherein 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 overheat protection circuit of 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 overheat protection circuit of claim 4, wherein the detection pins comprise 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.
6. An over-temperature protection method for 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; the sensing module is arranged close to the heating element;
when the external connection interface is inserted into external connection equipment, the control module detects the current temperature, and when the current temperature is smaller 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 connection equipment; the switch module is connected between the heating element and the external interface;
after the heating element is communicated with the external equipment, the control module detects the current temperature every preset time period, and when the current temperature is greater than the preset temperature threshold value, the switch module is controlled to be disconnected, so that the heating element is disconnected with the external equipment;
the heating element is connected with the first end of the switch module, the second end of the switch module is connected with an external interface of the electronic equipment, the third end of the switch module is connected with the first end of the control module, one end of the sensing module is connected with the second end of the control module, and the other end of the sensing module is grounded;
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 beads, the second thermistor is arranged close to the second magnetic beads, and the third thermistor is arranged close to the third magnetic beads;
the switch module is a switch chip, and a common pin of the switch chip is a first end of the switch module; the common pins comprise 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 common pin, the first end of the second magnetic bead is connected with the second common pin, and the first end of the third magnetic bead is connected with the third common pin; the second ends of the first magnetic beads, the second ends of the second magnetic beads and the second ends of the third magnetic beads are connected with an audio output chip, and the second ends of the third magnetic beads are grounded through a TVS (transient voltage suppressor).
7. An electronic device comprising an overtemperature protection circuit of an electronic device as claimed in any one of claims 1-5.
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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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