CN108988293A - Thermal-shutdown circuit and data line with it - Google Patents
Thermal-shutdown circuit and data line with it Download PDFInfo
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- CN108988293A CN108988293A CN201810847280.8A CN201810847280A CN108988293A CN 108988293 A CN108988293 A CN 108988293A CN 201810847280 A CN201810847280 A CN 201810847280A CN 108988293 A CN108988293 A CN 108988293A
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- Prior art keywords
- divider resistance
- temperature
- switching element
- resistance
- thermal
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Classifications
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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
-
- 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
- H02H5/044—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 a semiconductor device to sense the temperature
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- Protection Of Static Devices (AREA)
Abstract
A kind of thermal-shutdown circuit and data line, wherein, temperature sense module exports induced voltage according to environment temperature, first path terminal of first switching element receives input voltage, first control terminal of first switching element receives induced voltage, the alternate path end of first switching element is connected with the common end of the first divider resistance and the second divider resistance, the third path end of second switch element receives input voltage, second control terminal of second switch element is connected with the alternate path end of first switching element, when the environment temperature of temperature sense module is lower than the temperature sensor of temperature sense module, the induced voltage of temperature sense module output disconnects first switching element to control second switch element conductive, when the environment temperature of temperature sense module is greater than or equal to the temperature sensor of temperature sense module, the induced electricity of temperature sense module output Pressure is connected first switching element to control the disconnection of second switch element, so that disconnecting circuit is to prevent device excess temperature from burning.
Description
Technical field
The present invention relates to the technical fields of data line, especially with regard to a kind of thermal-shutdown circuit and with its data
Line.
Background technique
Universal serial bus (Universal Serial Bus, USB) is connect computer system and external equipment one
Kind serial bus standard and a kind of technical specification of input/output interface, are widely used in PC and movement is set
The information communications product such as standby, and extend to other related fieldss such as photographic goods, DTV (set-top box), game machine.Wherein,
USB Type-C interface is a kind of USB interface gradually popularized, with universal, more equipment of getting up of USB Type-C interface
USB Type-C agreement is needed support, USB Type-C interface is usually located at the bottom of smart phone, most of the time for filling
The purposes such as electricity, data transmission, maximum feature are to support from pluggable " positive anti-plug " function of tow sides, while and it
Matching used USB data line is also thinner, lighter.
Currently, the data line of USB Type-C interface only increases positive temperature coefficient heat on the VBUS access of output end
Quick resistance (Positive Temperature Coefficient, PTC), although making cable only with PTC, cost is relatively low,
But due to individually using the protection temperature of PTC at least to continue 1-2 minutes at 100 DEG C or more, so that can not be timely and effective using PTC
Avoid Type-C interface from burning because temperature is excessively high, bring puzzlement to user.
Summary of the invention
The purpose of the present invention is to provide a kind of thermal-shutdown circuit, it can be achieved that reliable overheat protector function.
The present invention provides a kind of thermal-shutdown circuit, including temperature sense module, first switching element, second switch member
Part, the first divider resistance and the second divider resistance；
The temperature sense module is used to export induced voltage according to environment temperature；
The first switching element includes the first path terminal, alternate path end and the first control terminal, first path terminal
Input voltage is received, first control terminal receives the induced voltage, the alternate path end and first divider resistance
And the common end of second divider resistance is connected；
First divider resistance and second divider resistance are sequentially connected in series setting in first path terminal and ground connection
Between line；
The second switch element includes third path end, fourth passage end and the second control terminal, the third path end
The input voltage is received, second control terminal is connected with the alternate path end of the first switching element, the four-way
Terminal is used for output voltage；
Wherein, when the environment temperature of the temperature sense module is lower than the temperature sensor of the temperature sense module, institute
The induced voltage for stating the output of temperature sense module disconnects the first switching element, is led with controlling the second switch element
It is logical, when the environment temperature of the temperature sense module is greater than or equal to the temperature sensor of the temperature sense module, the temperature
The first switching element is connected in the induced voltage of degree induction module output, is disconnected with controlling the second switch element.
Further, the first switching element is N-channel MOS FET field-effect tube, and the second switch element is P ditch
Road MOSFET field-effect tube.
Further, the temperature sense module includes being connected on the first path terminal and the ground connection of the first switching element
The common end of third divider resistance and thermistor between line, the third divider resistance and the thermistor is used to export
The induced voltage.
Further, the thermistor is posive temperature coefficient thermistor, the third divider resistance and the positive temperature
Degree coefficient resistance is sequentially connected in series between the first path terminal and ground line of the first switching element.
Further, first divider resistance, the second divider resistance, posive temperature coefficient thermistor and third partial pressure electricity
Resistance value size relation between resistance are as follows:
In formula, R1Indicate the resistance value of first divider resistance, R2Indicate the resistance value of second divider resistance, R3It indicates
The resistance value of the third divider resistance, RPTCIndicate resistance value of the posive temperature coefficient thermistor lower than temperature sensor when.
Further, the thermistor is negative tempperature coefficient thermistor, the negative tempperature coefficient thermistor and institute
Third divider resistance is stated to be sequentially connected in series between the first path terminal and ground line of the first switching element.
Further, first divider resistance, the second divider resistance, negative tempperature coefficient thermistor and third partial pressure electricity
Resistance value size relation between resistance are as follows:
In formula, R1Indicate the resistance value of first divider resistance, R2Indicate the resistance value of second divider resistance, R3It indicates
The resistance value of the third divider resistance, RNTCIndicate resistance value of the negative tempperature coefficient thermistor lower than temperature sensor when.
Further, the temperature sensor of the thermistor is 70-80 DEG C, and the impedance response time is less than 1s.
It further, further include electric capacity of voltage regulation, the electric capacity of voltage regulation is connected to the first control of the first switching element
Between end and ground line.
The present invention also provides a kind of data lines, including thermal-shutdown circuit as described above.
In the embodiment of the present invention, thermal-shutdown circuit includes temperature sense module, first switching element, second switch member
Part, the first divider resistance and the second divider resistance can have by temperature sense module, the first divider resistance and the second divider resistance
The on-off of effect control first switching element and second switch element, thus realize the function of overheat protector, it is simple and reliable for structure.This
Outside, it is connected due to the second control terminal of second switch element and the first divider resistance with the common end of the second divider resistance, so that
Second switch element when environment temperature is normal can not by temperature sense module export induced voltage influence of fluctuations and protect
It keeps steady and determines conducting, ensure that the stability of circuit.
Detailed description of the invention
Fig. 1 is the electrical block diagram of thermal-shutdown circuit in first embodiment of the invention.
Fig. 2 is the electrical block diagram of thermal-shutdown circuit in second embodiment of the invention.
Specific embodiment
It is of the invention to reach the technical means and efficacy that predetermined goal of the invention is taken further to illustrate, below in conjunction with
Attached drawing and preferred embodiment, to a specific embodiment of the invention, structure, feature and its effect, detailed description is as follows.
Fig. 1 is the electrical block diagram of thermal-shutdown circuit in first embodiment of the invention.As shown in Figure 1, this implementation
The thermal-shutdown circuit 10 of example may include temperature sense module 11, first switching element Q1, second switch element Q2, the first partial pressure
Resistance R1, the second divider resistance R2 and electric capacity of voltage regulation C1.
Temperature sense module 11 is used to export induced voltage according to environment temperature.
First switching element Q1 includes the first path terminal, alternate path end and the first control terminal, first switching element Q1's
First path terminal receives input voltage vin, and the first control terminal of first switching element Q1 receives what temperature sense module 11 exported
Induced voltage, the common end phase at the alternate path end of first switching element Q1 and the first divider resistance R1 and the second divider resistance R2
Even.Specifically, in the present embodiment first switching element Q1 be N-channel MOS FET field-effect tube, above-mentioned first path terminal i.e. this
The drain electrode of effect pipe, the above-mentioned alternate path end i.e. source electrode of the field-effect tube, the above-mentioned first control terminal i.e. grid of the field-effect tube
Pole.
Electric capacity of voltage regulation C1 be connected to first switching element Q1 the first control terminal and ground line GND between, play filtering, surely
The effect of pressure.
Second switch element Q2 includes third path end, fourth passage end and the second control terminal, second switch element Q2's
Third path end receives input voltage vin, and the second control terminal of second switch element Q2 and the second of first switching element Q1 are led to
Terminal is connected, and the fourth passage end of second switch element Q2 is used for output voltage Vout.Specifically, second switch in the present embodiment
Element Q2 is P-channel MOSFET field-effect tube, and the above-mentioned third path end i.e. source electrode of the field-effect tube, above-mentioned fourth passage end is
The drain electrode of the field-effect tube, the above-mentioned second control terminal i.e. grid of the field-effect tube.
First divider resistance R1 and the second divider resistance R2 are sequentially connected in series the first access that first switching element Q1 is arranged in
Between end and ground line GND, by configuring the resistance value of the first divider resistance R1 and the second divider resistance R2, second switch can be made
Element Q2 conducting.
In use, when the environment temperature of temperature sense module 11 is lower than the temperature sensor of temperature sense module 11
When, the induced voltage that temperature sense module 11 exports disconnects first switching element Q1, to control second switch element Q2 conducting,
When the environment temperature of temperature sense module 11 is greater than or equal to the temperature sensor of temperature sense module 11, temperature sense module 11
First switching element Q1 is connected in the induced voltage of output, to control second switch element Q2 disconnection.
Specifically, in the present embodiment, temperature sense module 11 includes the first access for being connected on first switching element Q1
Third divider resistance R3 and thermistor R4 between end and ground line GND, the public affairs of third divider resistance R3 and thermistor R4
End is for exporting induced voltage altogether, and the temperature sensor of the thermistor R4 in the present embodiment is 70-80 DEG C, and the impedance response time is small
In 1s, so as to incude the variation of environment temperature quickly with timely protector part.In the present embodiment, thermistor R4 is positive temperature
Spend coefficient resistance, third divider resistance R3 and posive temperature coefficient thermistor are sequentially connected in series the of first switching element Q1
Between one path terminal and ground line GND, wherein for the above-mentioned on-off function for realizing thermal-shutdown circuit 10, the in the present embodiment
One divider resistance R1, the second divider resistance R2, posive temperature coefficient thermistor (thermistor R4) and third divider resistance R3 it
Between resistance value size relation are as follows:
In formula, R1Indicate the resistance value of the first divider resistance R1, R2Indicate the resistance value of the second divider resistance R2, R3Indicate third
The resistance value of divider resistance R3, RPTCIndicate resistance value when posive temperature coefficient thermistor is lower than temperature sensor.In addition, the first partial pressure
The resistance value size relation of resistance R1 and the second divider resistance R2 can be according to the size of input voltage vin and second switch element Q2
Pressure resistance is configured, and second switch element Q2 need to only be made to keep saturation conduction and not breakdown.
In this way, being N-channel MOS FET field-effect tube, second switch element Q2 by first switching element Q1 in this present embodiment
For P-channel MOSFET field-effect tube, when the environment temperature of temperature sense module 11 is lower than the temperature sensor of temperature sense module 11
When, due toSo that the first control terminal (grid) received induced voltage of first switching element Q1 is small
In or equal to first switching element Q1 alternate path end (source electrode) voltage and make first switching element Q1 disconnect, at this point, second
The voltage of the second control terminal (grid) of switch element Q2 is less than the voltage of third path end (source electrode), and second switch element Q2 is led
It is logical, further, since the second control terminal of second switch element Q2 and the first divider resistance R1 and the second divider resistance R2's is public
End is connected, and allows second switch element Q2 to keep stablizing conducting, to guarantee the normal use of device.When temperature sense mould
When the environment temperature of block 11 is greater than or equal to the temperature sensor of temperature sense module 11, posive temperature coefficient thermistor (temperature-sensitive electricity
Resistance R4) resistance value ramp so that the first control terminal (grid) the received induced voltage of first switching element Q1 is higher than the
Alternate path end (source electrode) voltage of one switch element Q1 and make first switching element Q1 be connected, at this point, output voltage Vin is direct
It is added on the second divider resistance R2, so that the voltage of the second control terminal (grid) of second switch element Q2 is equal to third path end
The voltage of (source electrode), second switch element Q2 is disconnected, so that disconnecting circuit is to avoid device because of temperature in environment temperature exception
It is excessively high and burn.
It follows that in the present embodiment, passing through temperature sense module 11, the first divider resistance R1 and the second divider resistance
R2 just can reliably control the on-off of first switching element Q1 and second switch element Q2, thus realize the function of overheat protector,
Structure is simple, further, since the second control terminal of second switch element Q2 and the first divider resistance R1 and the second divider resistance R2
Common end be connected, allow second switch element Q2 when environment temperature is normal not by temperature sense module 11 export sense
It answers the influence of fluctuations of voltage and keeps stablizing conducting, ensure that the stability of circuit.
Fig. 2 is the electrical block diagram of thermal-shutdown circuit in second embodiment of the invention.As shown in Fig. 2, this implementation
The structure and principle and the structure and principle of current foldback circuit 10 of the thermal-shutdown circuit 20 of example are essentially identical, and difference exists
In the thermistor R4 in the temperature sense module 21 of the present embodiment is negative tempperature coefficient thermistor, and negative temperature coefficient is warm
Quick resistance and third divider resistance R3 are sequentially connected in series between the first path terminal and ground line GND of first switching element Q1.
It specifically, is to realize overheat protector function, it is the first divider resistance R1 in the present embodiment, the second divider resistance R2, negative
Resistance value size relation between temperature coefficient thermistor R4 (thermistor R4) and third divider resistance R3 are as follows:
In formula, R1Indicate the resistance value of the first divider resistance R1, R2Indicate the resistance value of the second divider resistance R2, R3Indicate third
The resistance value of divider resistance R3, RNTCIndicate resistance value when negative tempperature coefficient thermistor is lower than temperature sensor.In addition, the first partial pressure
The resistance value size relation of resistance R1 and the second divider resistance R2 can be according to the size of input voltage vin and second switch element Q2
Pressure resistance is configured, and second switch element Q2 need to only be made to keep saturation conduction and not breakdown.
In this way, being N-channel MOS FET field-effect tube, second switch element Q2 by first switching element Q1 in this present embodiment
For P-channel MOSFET field-effect tube, when the environment temperature of temperature sense module 21 is lower than the temperature sensor of temperature sense module 21
When, due toSo that the first control terminal (grid) received induced voltage of first switching element Q1 is small
In or equal to first switching element Q1 alternate path end (source electrode) voltage and make first switching element Q1 disconnect, at this point, second
The voltage of the second control terminal (grid) of switch element Q2 is less than the voltage of third path end (source electrode), and second switch element Q2 is led
It is logical, further, since the second control terminal of second switch element Q2 and the first divider resistance R1 and the second divider resistance R2's is public
End is connected, and allows second switch element Q2 to keep stablizing conducting, to guarantee the normal use of device.When temperature sense mould
When the environment temperature of block 21 is greater than or equal to the temperature sensor of temperature sense module 21, negative tempperature coefficient thermistor (temperature-sensitive electricity
Hinder R4) the decline of resistance value straight line so that the first control terminal (grid) the received induced voltage of first switching element Q1 is higher than the
Alternate path end (source electrode) voltage of one switch element Q1 and make first switching element Q1 be connected, at this point, output voltage Vin is direct
It is added on the second divider resistance R2, so that the voltage of the second control terminal (grid) of second switch element Q2 is equal to third path end
The voltage of (source electrode), second switch element Q2 is disconnected, so that disconnecting circuit is to avoid device because of temperature in environment temperature exception
It is excessively high and burn.
The embodiment of the present invention also provides a kind of data line, including thermal-shutdown circuit as described above.It should be noted that
The data line of the embodiment of the present invention includes but is not limited to all kinds of USB data lines, particularly, by taking USB Type-C data line as an example,
Input voltage vin and VBUS signal and GND signal that ground line GND signal is on USB Type-C data line respectively, and temperature
Thermistor R4 in induction module will be disposed close at the position of USB Type-C interface accurately to detect USB Type-C
The temperature of interface effectively plays the effect for preventing USB Type-C interface excess temperature from burning.
In the thermal-shutdown circuit of the embodiment of the present invention, pass through temperature sense module, the first divider resistance and second point
The on-off of first switching element and second switch element can be effectively controlled in piezoresistance, to realize the function of overheat protector, structure
It is simple and reliable, in addition, the common end phase of the second control terminal of second switch element and the first divider resistance and the second divider resistance
Even, pass through the resistance according to the size of input voltage and the pressure resistance of second switch element to the first divider resistance and the second divider resistance
Value size relation is configured, the sense that may make second switch element not exported by temperature sense module when environment temperature is normal
It answers the influence of fluctuations of voltage and keeps stablizing conducting, ensure that the stability of circuit.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
It is right according to the technical essence of the invention for the equivalent embodiment of equivalent variations, but without departing from the technical solutions of the present invention
Any simple modification, equivalent change and modification made by above embodiments, all of which are still within the scope of the technical scheme of the invention.
Claims (10)
1. a kind of thermal-shutdown circuit, which is characterized in that including temperature sense module, first switching element, second switch element,
First divider resistance and the second divider resistance；
The temperature sense module is used to export induced voltage according to environment temperature；
The first switching element includes the first path terminal, alternate path end and the first control terminal, and first path terminal receives
Input voltage, first control terminal receive the induced voltage, the alternate path end and first divider resistance and institute
The common end for stating the second divider resistance is connected；
First divider resistance and second divider resistance are sequentially connected in series setting in first path terminal and ground line
Between；
The second switch element includes third path end, fourth passage end and the second control terminal, and the third path end receives
The input voltage, second control terminal are connected with the alternate path end of the first switching element, the fourth passage end
For output voltage；
Wherein, when the environment temperature of the temperature sense module is lower than the temperature sensor of the temperature sense module, the temperature
The induced voltage of degree induction module output disconnects the first switching element, to control the second switch element conductive, when
When the environment temperature of the temperature sense module is greater than or equal to the temperature sensor of the temperature sense module, the temperature sense
The first switching element is connected in the induced voltage of module output, is disconnected with controlling the second switch element.
2. thermal-shutdown circuit as described in claim 1, which is characterized in that the first switching element is N-channel MOS FET
Field-effect tube, the second switch element are P-channel MOSFET field-effect tube.
3. thermal-shutdown circuit as described in claim 1, which is characterized in that the temperature sense module is described including being connected on
Third divider resistance and thermistor between the first path terminal and ground line of first switching element, the third divider resistance
Common end with the thermistor is for exporting the induced voltage.
4. thermal-shutdown circuit as claimed in claim 3, which is characterized in that the thermistor be positive temperature coefficient thermal electricity
Resistance, the third divider resistance and the posive temperature coefficient thermistor are sequentially connected in series to be led to the first of the first switching element
Between terminal and ground line.
5. thermal-shutdown circuit as claimed in claim 4, which is characterized in that first divider resistance, the second divider resistance,
Resistance value size relation between posive temperature coefficient thermistor and third divider resistance are as follows:
In formula, R1Indicate the resistance value of first divider resistance, R2Indicate the resistance value of second divider resistance, R3Described in expression
The resistance value of third divider resistance, RPTCIndicate resistance value of the posive temperature coefficient thermistor lower than temperature sensor when.
6. thermal-shutdown circuit as claimed in claim 3, which is characterized in that the thermistor is negative temperature coefficient thermistor power
Resistance, the negative tempperature coefficient thermistor and the third divider resistance are sequentially connected in series to be led to the first of the first switching element
Between terminal and ground line.
7. thermal-shutdown circuit as claimed in claim 6, which is characterized in that first divider resistance, the second divider resistance,
Resistance value size relation between negative tempperature coefficient thermistor and third divider resistance are as follows:
In formula, R1Indicate the resistance value of first divider resistance, R2Indicate the resistance value of second divider resistance, R3Described in expression
The resistance value of third divider resistance, RNTCIndicate resistance value of the negative tempperature coefficient thermistor lower than temperature sensor when.
8. thermal-shutdown circuit as claimed in claim 3, which is characterized in that the temperature sensor of the thermistor is 70-80
DEG C, the impedance response time is less than 1s.
9. thermal-shutdown circuit as described in claim 1, which is characterized in that further include electric capacity of voltage regulation, the electric capacity of voltage regulation connects
It connects between the first control terminal and ground line of the first switching element.
10. a kind of data line, which is characterized in that including thermal-shutdown circuit as in one of claimed in any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810847280.8A CN108988293B (en) | 2018-07-27 | 2018-07-27 | Over-temperature protection circuit and data line with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810847280.8A CN108988293B (en) | 2018-07-27 | 2018-07-27 | Over-temperature protection circuit and data line with same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108988293A true CN108988293A (en) | 2018-12-11 |
| CN108988293B CN108988293B (en) | 2020-06-02 |
Family
ID=64552017
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810847280.8A Active CN108988293B (en) | 2018-07-27 | 2018-07-27 | Over-temperature protection circuit and data line with same |
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| Country | Link |
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| CN (1) | CN108988293B (en) |
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| WO2020176157A1 (en) * | 2019-02-27 | 2020-09-03 | Google Llc | Usb type-c port short protection |
| WO2020253606A1 (en) * | 2019-06-18 | 2020-12-24 | 维沃移动通信有限公司 | Connector |
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| WO2020176157A1 (en) * | 2019-02-27 | 2020-09-03 | Google Llc | Usb type-c port short protection |
| US11233386B2 (en) | 2019-02-27 | 2022-01-25 | Google Llc | USB Type-C port short protection |
| US11784485B2 (en) | 2019-02-27 | 2023-10-10 | Google Llc | USB Type-C port short protection |
| WO2020253606A1 (en) * | 2019-06-18 | 2020-12-24 | 维沃移动通信有限公司 | Connector |
| EP3989373A4 (en) * | 2019-06-18 | 2022-07-27 | Vivo Mobile Communication Co., Ltd. | Connector |
| US12015225B2 (en) | 2019-06-18 | 2024-06-18 | Vivo Mobile Communication Co., Ltd. | Connector |
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| Publication number | Publication date |
|---|---|
| CN108988293B (en) | 2020-06-02 |
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