CN109038487A - A kind of temperature protection circuit and charging base for charging base - Google Patents
A kind of temperature protection circuit and charging base for charging base Download PDFInfo
- Publication number
- CN109038487A CN109038487A CN201811259963.8A CN201811259963A CN109038487A CN 109038487 A CN109038487 A CN 109038487A CN 201811259963 A CN201811259963 A CN 201811259963A CN 109038487 A CN109038487 A CN 109038487A
- Authority
- CN
- China
- Prior art keywords
- temperature
- charging base
- electronic product
- charging
- charge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000001514 detection method Methods 0.000 claims abstract description 32
- 238000013021 overheating Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 15
- 230000005611 electricity Effects 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 27
- 230000008569 process Effects 0.000 abstract description 25
- 238000013461 design Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 206010053615 Thermal burn Diseases 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000001535 kindling effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
-
- H02J7/0088—
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of temperature protection circuits and charging base for charging base, including temperature sensing circuit, comparison circuit and charge protection chip；The temperature sensing circuit carries out temperature detection to the electronic product of connection charging base, and according to the corresponding detection voltage of temperature rise variation output；The comparison circuit receives the detection voltage and is compared with reference voltage, to generate temperature protection signal when the temperature of the electronic product is more than secure threshold；The charge protection chip connects the comparison circuit, and the voltage output of charging base is turned off when receiving the temperature protection signal of comparison circuit output, carries out overheating protection to electronic product.Charging base of the invention can during the charging process electronic product temperature rise be more than secure threshold when, automatically shut down the voltage output of charging base, and after the temperature of electronic product restores normal, charging process can be restored automatically, so that the charging process of electronic product is more safe and reliable.
Description
Technical field
The invention belongs to charging unit technical fields, specifically, being to be related to a kind of circuit applied to charging base to set
Meter.
Background technique
With the fast development of electronic technology, wearing class of electronic devices is increasingly various, such as smartwatch, Intelligent bracelet
Deng bringing great convenience to daily life.Current wearing class of electronic devices, built-in rechargeable battery are equipment
Circuit system power supply, and can use external charger (plug-type or pedestal type) be rechargeable battery charge accumulation of energy.
As battery capacity is continuously increased in wearing class of electronic devices, charging current is also increased with it, inevitably
The temperature that will lead to wearable device in charging process constantly increases.And current charger is in the process to charge for wearable device
In, corresponding over-voltage and overcurrent protection measure are detected and formulated only for charge power supply and charging current, for charging temperature
There is no corresponding defencive functions for degree, just there is wearable device in this way because temperature rise of charging is excessively high and scald user, equipment itself damage
It is bad even to cause the hidden danger such as equipment kindling, seriously affected user using safe.
Summary of the invention
The present invention proposes one kind and is suitable for make up the defect that existing charger does not have charging temperature defencive function
The temperature protection circuit of charging base can use the temperature rise of charging base detection electronic product during the charging process, and to electricity
Sub- product carries out overheating protection.
In order to solve the above technical problems, the present invention is achieved by the following scheme:
In one aspect, the invention proposes a kind of temperature protection circuits for charging base, including temperature sensing circuit, ratio
Compared with circuit and charge protection chip；The temperature sensing circuit carries out temperature detection to the electronic product of connection charging base, and
According to the corresponding detection voltage of temperature rise variation output；The comparison circuit receives the detection voltage and is compared with reference voltage
Compared with to generate temperature protection signal when the temperature of the electronic product is more than secure threshold；The charge protection chip connection
The comparison circuit turns off the voltage output of charging base when receiving the temperature protection signal of comparison circuit output, to electricity
Sub- product carries out overheating protection.
Preferably, be provided with thermistor and divider resistance in the temperature sensing circuit, the thermistor with point
Piezoresistance connects to form potential-divider network, passes through the divider node output of the potential-divider network detection voltage.
Preferably, by the potential-divider network be connected to charging base conversion generate required by electronic product charge power supply with
Between ground, by being divided to the charge power supply, to generate the detection voltage.
A kind of preferred circuit as the comparison circuit designs, and the present invention is provided with one in the comparison circuit and compares
The non-inverting input terminal of device, the comparator connects the charge power supply by the divider resistance, and passes through the thermistor
Ground connection, the thermistor are the thermistor of negative temperature coefficient, and the inverting input terminal connection of the comparator is described with reference to electricity
Pressure exports the effective temperature protection signal of low level.
Another preferred circuit as the comparison circuit designs, and the present invention is provided with one in the comparison circuit
The inverting input terminal of comparator, the comparator connects the charge power supply by the divider resistance, and passes through the temperature-sensitive
Resistance eutral grounding, the thermistor are the thermistor of positive temperature coefficient, and the non-inverting input terminal of the comparator connects the ginseng
Voltage is examined, the effective temperature protection signal of low level is exported.
It is dynamic in order to enable the temperature protection signal exported by comparator to control charge protection chip execution overheating protection
To make, the input terminal that the present invention designs the charge protection chip receives the charge power supply, and output end connects the charging interface,
Enable end is separately connected the output end of the charge power supply and the comparator；The charge protection chip high level is enabled,
The temperature of the electronic product is lower than controlled charge power supply when secure threshold and enters enabled state, controls the input terminal
It is connected to output end, charge power supply is transmitted to charging interface, charged for electronic product；Have in comparator output low level
When the temperature protection signal of effect, controls the input terminal and output end disconnects, block conveying of the charge power supply to charging interface, adopt
The temperature rise that electronic product is limited with the mode for terminating charging realizes temperature protection to electronic product.
One kind as the charge power supply preferably generates mode, and rectification circuit and straight is provided in the charging base
Conversion circuit is flowed, the AC power source for accessing charging base is rectified into DC power supply and exported to direct current conversion electricity by the rectification circuit
Road generates the charge power supply to convert.
In order to further enhance the safety of electronic product charging process, charge protection chip of the invention has current limliting
End, one configuration resistance of connection, the current threshold of charge protection chip is adjusted by the resistance value of regulating allocation resistance；The charger
Shield chip turns off the voltage of charging base when detecting that the charging current for flowing through charge protection chip is greater than the current threshold
Output stops charging process, avoids the excessive temperature rise for causing electronic product of charging current excessively high, arranges using thermometric+current limliting is dual
Apply the charging safety for ensuring electronic product.
In order to avoid charging process frequent start-stop, electronic product is damaged, the present invention is excellent in the output end of the comparison circuit
Choosing connection delay capacitor, the capacitance by adjusting delay capacitor adjust the delay time of overheating protection movement.
On the other hand, it the invention also provides a kind of charging base, including shell and lays on the shell and uses
In the charging interface of connection electronic product, it is packaged with temperature sensing circuit, comparison circuit and charge protection core in the housing
Piece；The temperature sensing circuit carries out temperature detection to the electronic product of connection charging base, and changes output phase according to temperature rise
The detection voltage answered；The comparison circuit receives the detection voltage and is compared with reference voltage, to produce in the electronics
Temperature protection signal is generated when the temperature of product is more than secure threshold；The charge protection chip connects the comparison circuit, is connecing
The voltage output that charging base is turned off when receiving the temperature protection signal of comparison circuit output, carries out overheat guarantor to electronic product
Shield.
In order to improve the sensitivity to electronic product temperature rise detection, the present invention is provided with heat in the temperature sensing circuit
Quick resistance, preferably by thermistor installation on the housing and at the position of the neighbouring charging interface, in electronics
When product is connected on the charging interface of charging base, the temperature change of electronic product can be promptly and accurately sensed.
Compared with prior art, the advantages and positive effects of the present invention are: charging base of the invention can charge
Real-time monitoring is carried out to the temperature change of electronic product in journey, and can be when the temperature rise of electronic product is more than secure threshold, automatically
The voltage output for turning off charging base, avoids the safety that electronic product causes during large current charge because temperature rise is excessively high
Hidden danger, so that the temperature of electronic product can maintain within the acceptable range, to be obviously improved electricity during the charging process always
The safety and reliability of sub- product charging process.In addition, charging base of the invention restores normal in the temperature of electronic product
Afterwards, charging process can be restored automatically, charge power supply is continued to output as electronic product charging, protected increasing temperature for charging base
While protective function, the intelligent level of charging base is improved, improves the usage experience of user.The present invention is using hardware electricity
Road realizes the temperature protection function of charging base, and independent of software control, therefore the reliability of circuit work is higher.
After the detailed description of embodiment of the present invention is read in conjunction with the figure, other features and advantages of the invention will become more
Add clear.
Detailed description of the invention
Fig. 1 is a kind of circuit theory frame of embodiment of the temperature protection circuit for charging base proposed by the invention
Figure；
Fig. 2 is a kind of physical circuit functional block diagram of embodiment of temperature protection circuit shown in FIG. 1；
Fig. 3 is the physical circuit functional block diagram of another embodiment of temperature protection circuit shown in FIG. 1.
Specific embodiment
A specific embodiment of the invention is described in more detail with reference to the accompanying drawing.
The present embodiment adds temperature protection electricity to increase temperature protection function on charging base in charging base
Road, as shown in Figure 1, including temperature sensing circuit, comparison circuit and charge protection chip etc..In the present embodiment, the charging
Pedestal can be to be also possible to that other are built-in with for mobile phone, tablet computer etc. for the charging base of wearing class of electronic devices charging
The charging base of the electronic product charging of rechargeable battery.Wherein, it is configured with temperature-sensing element in temperature sensing circuit, preferably installs
It can just fit with electronic product on the shell of charging base and when electronic product is put into charging base or close to electricity
The position of sub- product, such as at the position of the charging interface of charging base, in order to which temperature-sensing element can be accurately and in time
The temperature rise variation for the electronic product being inserted into charging base is perceived, and enables the temperature sensing circuit according to detecting
Product temperature generates corresponding detection voltage Vo, output to comparison circuit.It is produced previously according to temperature sensing circuit in electronics
The temperature of product reaches the detection voltage generated when secure threshold and determines reference voltage VREF, using comparison circuit to practical application
The detection voltage Vo and reference voltage V of temperature sensing circuit output in the processREFIt is compared, with super in the temperature of electronic product
Effective temperature protection signal V is generated when crossing its secure thresholdEN, it is sent to charge protection chip.The charge protection chip connects
It connects in charging base for conveying charge power supply VCHGPower supply output line road in, receiving comparison circuit output it is effective
Temperature protection signal VENWhen, the power supply output line road is automatically cut off, to turn off the voltage output of charging base, using terminating
The mode of charging realizes overheating protection to electronic product, it is ensured that the charging safety of electronic product.
In the present embodiment, the charge power supply VCHGIt can be by the rectification circuit being built in charging base and pressure stabilizing electricity
Electric main is converted and is generated in road.That is, connecting electric main using charging base, receiving 220V AC power source and being transmitted to rectification
Circuit is sent to DC converting circuit to rectify generation high-voltage DC power supply.The DC converting circuit may include transformation
The high-voltage DC power supply that rectification circuit exports is converted into electricity by the DC voltages processing circuit such as device, filter circuit and voltage regulator circuit
Low-voltage dc power supply needed for sub- product charging, such as the charge power supply V of+5V or+9V or+12VCHG, via charge protection chip
It is sent to charging interface.The charging interface be mounted on it is on the shell of charging base and exposed, when electronic product is placed in charging
When in pedestal, the charging interface of electronic product can just be docked with the charging interface on charging base, receive charging base output
Charge power supply VCHG, it is the rechargeable battery charging accumulation of energy inside electronic product.
In the temperature protection circuit of the present embodiment, reference voltage VREFDivider resistance be can use to the charge power supply
VCHGPartial pressure obtains.As shown in Fig. 2, divider resistance R107 and R105 can be laid in the internal circuit board of charging base, will divide
One end of piezoresistance R107 is grounded by divider resistance R105, and the other end is directly connected to charge power supply VCHGOr pass through current limliting electricity
Hinder R101 connection charge power supply VCHG.The resistance value for configuring divider resistance R107 and R105, makes the centre of divider resistance R107 and R105
Voltage at node is equal to reference voltage VREF.By the intermediate node of divider resistance R107 and R105 be connected to comparison circuit or
It is connected to comparison circuit via resistance R115, provides reference voltage V for comparison circuitREF。
In the temperature sensing circuit of the present embodiment, it is preferred to use thermistor cooperates divider resistance as temperature-sensing element
R106, R110 constitute potential-divider network, are connected to charge power supply VCHGBetween ground, by charge power supply VCHGIt is divided, with
Generate the detection voltage Vo for being able to reflect electronic product temperature change, output to the comparison circuit.One as the present embodiment
Kind preferred design, the thermistor can select the thermistor RT101 of negative temperature system, as shown in Figure 2；It can also be with
The thermistor RT102 of positive temperature coefficient is selected, as shown in Figure 3.
When selecting the thermistor RT101 of negative temperature system to design the temperature sensing circuit, as shown in Fig. 2, can be with
One end of thermistor RT101 is grounded, the other end passes through current limliting by concatenated divider resistance R106, R110(or further
Resistance R101) it is connected to charge power supply VCHG.Select one of divider node connection between resistance RT101, R106, R110
Comparison circuit provides detection voltage Vo for comparison circuit.In Fig. 2, the divider node between resistance R106, R110 is selected to export institute
State detection voltage Vo, comparison circuit is sent to by resistance R113, with reference voltage VREFIt is compared.
In the present embodiment, the comparison circuit preferably use comparator U101 cooperate the connection of simple peripheral circuit and
At as shown in Figure 2.Detection voltage Vo is received using the non-inverting input terminal IN+ of comparator U101, utilizes the reverse phase of comparator U101
Input terminal IN- receives reference voltage VREF, and can divide in the non-inverting input terminal IN+ and inverting input terminal IN- of comparator U101
Not Lian Jie filter capacitor C109 and C110, be linked into the detection voltage Vo and reference voltage V of comparator U101 to improveREFIt is steady
It is qualitative, then promote the reliability of the temperature protection movement of charging base.
The thermistor RT101 of the negative temperature system is increased and resistance value reduction with the temperature of electronic product, is thus made
Obtain the detection voltage Vo by exporting at the divider node of resistance R106, R110 reduces as the temperature of electronic product increases.
When the temperature of electronic product is lower than secure threshold, Vo > VREF, comparator U101 is because the current potential of its non-inverting input terminal IN+ is higher than it
The current potential of inverting input terminal IN- and export high level signal, be transmitted to the enable end EN of charge protection chip U102.The present embodiment
Charge protection chip U102 high level it is enabled, the enable end EN of charge protection chip U102 can further be passed through to pull-up electricity
Resistance R108 is connected to charge power supply VCHG, and the input terminal IN of charge protection chip U102 is connected to charge power supply VCHG, output
End OUT is connected to the power pins VBUS of the charging interface of charging base.When comparator U101 exports high level signal, charging
The enabled operation of chip U102 is protected, its input terminal IN is controlled and is connected to its output end OUT, by charge power supply VCHGIt is sent to charging
The power pins VBUS of interface, for the electronic product charging being inserted into charging base.
Electronic product can be accompanied by temperature rise phenomenon during the charging process, as the temperature of electronic product increases, detect voltage
Vo reduces therewith.When the temperature for the electronic product being inserted into charging base is more than secure threshold, Vo < VREF, comparator U101
The effective temperature protection letter of low level is exported because the current potential of its non-inverting input terminal IN+ is lower than the current potential of its inverting input terminal IN-
Number VEN, the current potential of the enable end EN of charge protection chip U102 is dragged down, control charge protection chip U102 is out of service, by it
Input terminal IN and output end OUT is disconnected, and cuts off charge power supply VCHGTransmission to charging interface, that is, turn off the voltage of charging base
Output, stops the charging process of electronic product, and the temperature for reducing electronic product is reached with this, realizes to electronic product overheating protection
Purpose.
As the temperature of electronic product declines, detection voltage Vo is risen with it, when the temperature of electronic product is lower than safety threshold
After value, detection voltage Vo is increased beyond reference voltage VREF.At this point, comparator U101 exports high level signal, control charging again
It protects chip U102 to enable operation again, restores the voltage output of charging base, continue as electronic product charging.
If thermistor to be used to the thermistor RT102 of positive temperature coefficient instead, as shown in figure 3, in order to obtain low level
Effective temperature protection signal VEN, then need will test the inverting input terminal IN- that voltage Vo is transmitted to comparator U101, will refer to
Voltage VREFIt is transmitted to the non-inverting input terminal IN+ of comparator U101, the output end VOUT of comparator U101 is connected to charge protection
The enable end EN of chip U102.Since the thermistor RT102 of positive temperature coefficient is with the raising of temperature, resistance value is gradually increased,
Thus the detection voltage Vo exported at the divider node by resistance R106, R110 is caused to increase with the temperature of electronic product
Increase.When the temperature of electronic product is lower than secure threshold, Vo < VREF, comparator U101 output high level signal, holding charging
The enabled operating status for protecting chip U102, by charge power supply VCHGIt is exported by charging interface to electronic product, is electronic product
Charging.When the temperature of electronic product is higher than secure threshold, Vo > VREF, the comparator U101 output effective temperature protection of low level
Signal VEN, the current potential of the enable end EN of charge protection chip U102 is dragged down, keeps charge protection chip U102 out of service, control is filled
Electric protection chip U102 disconnects input terminal IN and output end OUT, turns off the voltage output of charging base, realizes to electronic product
Temperature protection.
After electronic product terminates charging process, temperature can be gradually reduced, and detection voltage Vo is gradually reduced, when electronics produces
When the temperature of product is lower than secure threshold, Vo < VREF, at this point, comparator U101 exports high level signal again, control charge protection
Chip U102 enables operation again, restores the voltage output of charging base, continues as electronic product charging.
In order to avoid charging base frequently executes overheating protection movement, the present embodiment is preferably in the defeated of the comparator U101
Outlet VOUT connection delay capacitor CT, that is, be grounded the output end VOUT of comparator U101 by delay capacitor CT, such as Fig. 2, figure
Shown in 3, by adjusting the capacitance of delay capacitor CT, the delay time of adjustable overheating protection movement.
Concrete operating principle is: when the voltage of the inverting input terminal IN- of comparator U101 is higher than its non-inverting input terminal IN+
When voltage, comparator U101 exports the effective temperature protection signal V of low levelENWhen, that is, the output end VOUT of comparator U101 exists
It is pulled down to ground inside it.At this point, due to being full of charge, and the spy that there is capacitor its both end voltage cannot be mutated in delay capacitor CT
Property, so that the enable end EN of charge protection chip U102 still maintains high level, continue current charging process.Thereafter,
Delay capacitor CT is discharged by the output end VOUT of comparator U101, causes the current potential of the enable end EN of charge protection chip U102
It gradually decreases, after delay time t1, the current potential of enable end EN is reduced to low level, turns off the voltage output of charging base, ties
The charging process of beam electrons product.In delay time t1, if the temperature of electronic product declines, be reduced to secure threshold hereinafter,
Then comparator U101 exports high level signal again, charges for delay capacitor CT, keeps the enable end of charge protection chip U102
The current potential of EN is always height, continues the charging process of electronic product, will not cause to charge because of the of short duration temperature rise of electronic product
Process frequent start-stop plays certain protective effect to electronic product.
Similarly, when charging base because the temperature of electronic product is excessively high turn off its voltage output after, if the temperature of electronic product
Degree reduces, and when being restored to secure threshold or less, comparator U101 exports high level again.At this point, depositing due to delay capacitor CT
, the enable end EN of charge protection chip U102 still keeps low potential, not to electronic product export charge power supply VCHG, Zhi Daoyan
When time t2 after, the voltage on delay capacitor CT gradually rises, and becomes the current potential of the enable end EN of charge protection chip U102
High level, and then restore the charging process of electronic product.In delay time t2, if the temperature of electronic product rises again, surpass
Secure threshold is crossed, then the output end VOUT of comparator U101 switchs to low level again, and control delay capacitor CT electric discharge keeps charging
Protect chip U102 enable end EN current potential be always it is low, continue turn off charging base voltage output, will not be produced because of electronics
The of short duration temperature drop of product and lead to charging process frequent start-stop, avoid frequent charge from damaging electronic product.
In addition, the present embodiment proposes the dual measure of thermometric+current limliting, common true in order to further increase temperature protection effect
Determine the charging process of charging base.Specifically, the charge protection chip U102 design temperature with metering function is selected to protect
Circuit, that is, the charge protection chip U102 has current limliting end ILIM, by configuring resistance R111 ground connection.Regulating allocation resistance
The current threshold of the adjustable charge protection chip U102 of the resistance value of R111, when charge protection chip U102 detects that flow through its defeated
When the charging current of outlet OUT is greater than the current threshold, no matter whether the temperature of electronic product is more than secure threshold, is controlled
Its input terminal IN and output end OUT is disconnected, and is turned off the voltage output of charging base, is stopped the charging process of electronic product, avoid
The temperature rise for causing electronic product because charging current is excessive is excessively high, realizes the duplicate protection of temperature control and current limliting.
Two pole of electrostatic protection can also be separately connected in the input terminal IN and output end OUT of the charge protection chip U102
Pipe D107, D102 protect charging base to inhibit electrostatic impact.
The present invention in charging base by increasing a small amount of simple electronic device, by the way of pure hardware circuit design
So that charging base has the function of temperature protection, not only overheating protection can be executed to the electronic product in charging process,
And after the temperature of electronic product restores normal, charging base can restore the charging process of electronic product, intelligent journey automatically
Degree is high, safe and reliable.
Certainly, the above description is not a limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the those of ordinary skill in domain is made within the essential scope of the present invention, also should belong to this hair
Bright protection scope.
Claims (10)
1. a kind of temperature protection circuit for charging base characterized by comprising
Temperature sensing circuit carries out temperature detection to the electronic product of connection charging base, and changes output phase according to temperature rise
The detection voltage answered；
Comparison circuit receives the detection voltage and is compared with reference voltage, with super in the temperature of the electronic product
Temperature protection signal is generated when crossing secure threshold；
Charge protection chip connects the comparison circuit, the shutdown when receiving the temperature protection signal of comparison circuit output
The voltage output of charging base carries out overheating protection to electronic product.
2. the temperature protection circuit according to claim 1 for charging base, which is characterized in that in the temperature detection
Thermistor and divider resistance are provided in circuit, the thermistor connect to form potential-divider network with divider resistance, by dividing
The divider node output of the pressure network network detection voltage.
3. the temperature protection circuit according to claim 2 for charging base, which is characterized in that the potential-divider network connects
It connects between the charge power supply and ground for the required by electronic product that charging base conversion generates, by dividing the charge power supply
Pressure, to generate the detection voltage.
4. the temperature protection circuit according to claim 3 for charging base, which is characterized in that in the comparison circuit
In be provided with a comparator, wherein
The non-inverting input terminal of the comparator connects the charge power supply by the divider resistance, and passes through the thermistor
Ground connection, the thermistor are the thermistor of negative temperature coefficient, and the inverting input terminal connection of the comparator is described with reference to electricity
Pressure exports the effective temperature protection signal of low level；
Alternatively,
The inverting input terminal of the comparator connects the charge power supply by the divider resistance, and passes through the thermistor
Ground connection, the thermistor are the thermistor of positive temperature coefficient, and the non-inverting input terminal connection of the comparator is described with reference to electricity
Pressure exports the effective temperature protection signal of low level.
5. the temperature protection circuit according to claim 4 for charging base, which is characterized in that the charge protection core
The input terminal of piece receives the charge power supply, and output end connects the charging interface, and enable end is separately connected the charge power supply
With the output end of the comparator；The charge protection chip high level is enabled, is lower than safety in the temperature of the electronic product
Controlled charge power supply when threshold value and enter enabled state, control the input terminal and be connected to output end；In the comparator
When exporting the effective temperature protection signal of low level, controls the input terminal and output end disconnects.
6. the temperature protection circuit according to any one of claim 1 to 5 for charging base, which is characterized in that institute
Charge protection chip is stated with current limliting end, one configuration resistance of connection adjusts charge protection core by the resistance value of regulating allocation resistance
The current threshold of piece；The charge protection chip is detecting the charging current for flowing through charge protection chip greater than the current threshold
When value, the voltage output of charging base is turned off.
7. the temperature protection circuit according to any one of claim 1 to 5 for charging base, which is characterized in that
The output end of the comparison circuit is connected with delay capacitor, and the capacitance by adjusting delay capacitor adjusts overheating protection movement
Delay time.
8. the temperature protection circuit according to any one of claim 3 to 5 for charging base, which is characterized in that
Rectification circuit and DC converting circuit are provided in the charging base, the rectification circuit will access the alternating current of charging base
Source is rectified into DC power supply and exports to DC converting circuit, generates the charge power supply by DC converting circuit conversion.
9. a kind of charging base, the charging interface including shell and laying on the shell and for connecting electronic product is special
Sign is, is encapsulated in the housing just like the temperature protection electricity described in any item of the claim 1 to 8 for charging base
Road.
10. charging base according to claim 9, which is characterized in that the temperature sensing circuit includes thermistor, institute
Thermistor installation is stated on the housing and at the position of the neighbouring charging interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811259963.8A CN109038487A (en) | 2018-10-26 | 2018-10-26 | A kind of temperature protection circuit and charging base for charging base |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811259963.8A CN109038487A (en) | 2018-10-26 | 2018-10-26 | A kind of temperature protection circuit and charging base for charging base |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109038487A true CN109038487A (en) | 2018-12-18 |
Family
ID=64614077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811259963.8A Withdrawn CN109038487A (en) | 2018-10-26 | 2018-10-26 | A kind of temperature protection circuit and charging base for charging base |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109038487A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110120691A (en) * | 2019-04-15 | 2019-08-13 | 出门问问信息科技有限公司 | A kind of charging base |
| CN111614138A (en) * | 2020-05-25 | 2020-09-01 | 维沃移动通信有限公司 | Interface protection circuit and electronic equipment |
| CN111611130A (en) * | 2020-05-13 | 2020-09-01 | 上海龙旗科技股份有限公司 | Method, system and equipment for preventing burning of target interface |
| CN111835069A (en) * | 2020-07-24 | 2020-10-27 | 维沃移动通信有限公司 | Charging device |
-
2018
- 2018-10-26 CN CN201811259963.8A patent/CN109038487A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110120691A (en) * | 2019-04-15 | 2019-08-13 | 出门问问信息科技有限公司 | A kind of charging base |
| CN111611130A (en) * | 2020-05-13 | 2020-09-01 | 上海龙旗科技股份有限公司 | Method, system and equipment for preventing burning of target interface |
| CN111611130B (en) * | 2020-05-13 | 2021-11-05 | 上海龙旗科技股份有限公司 | Method, system and equipment for preventing burning of target interface |
| CN111614138A (en) * | 2020-05-25 | 2020-09-01 | 维沃移动通信有限公司 | Interface protection circuit and electronic equipment |
| CN111835069A (en) * | 2020-07-24 | 2020-10-27 | 维沃移动通信有限公司 | Charging device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109038487A (en) | A kind of temperature protection circuit and charging base for charging base | |
| US20160336779A1 (en) | Charging Method, Alternating Current Adaptor, Charging Management Device and Terminal | |
| CN107431351B (en) | Soft short circuit overvoltage protection for data line in fast charging USB charger | |
| US11114876B2 (en) | Battery safety mechanism for battery fault conditions | |
| CN105826894B (en) | The charging short-circuit protection and power-supply device of power-supply device | |
| CN109804527A (en) | Charger | |
| US20180254644A1 (en) | Techniques for charger control | |
| MX2014007543A (en) | Service voltage load protection in an electric utility meter. | |
| CN109066888A (en) | A kind of charging control circuit and electronic product with temperature protection | |
| CN106451577A (en) | Power source for monitoring device in high-tension switch cabinet | |
| CN208849443U (en) | A kind of temperature protection circuit and charging base for charging base | |
| CN110829372A (en) | Intelligent anti-harmonic-eliminating PT comprehensive protection device and protection method thereof | |
| CN105870984A (en) | Charge control circuit, charge control method and power management integrated circuit | |
| CN106405217B (en) | The power loss measuring system and method for harmonic filter in HVDC transmission system | |
| CN110120691A (en) | A kind of charging base | |
| CN102332697B (en) | The transient electrical measured in aircraft power distribution is movable | |
| CN103606886A (en) | A novel intelligentized leakage relay | |
| CN208568115U (en) | A kind of CT takes electric temperature measuring equipment | |
| CN206250780U (en) | Monitoring device power supply in high-tension switch cabinet | |
| CN202696482U (en) | Power supply circuit for leakage circuit breaker | |
| CN209963797U (en) | Charging protection circuit and charging system | |
| CN110873821A (en) | Function design of electricity meter capable of preventing electricity stealing during zero line dropping measurement | |
| CN109212345A (en) | A kind of non-intrusive electrical load monitoring device | |
| CN103052149A (en) | Terminal and method for realizing power adaptability | |
| CN207504276U (en) | A kind of multifunction wiring board |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20181218 |