CN106598105B - A kind of temperature-control circuit and temprature control method based on mobile terminal - Google Patents
A kind of temperature-control circuit and temprature control method based on mobile terminal Download PDFInfo
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- CN106598105B CN106598105B CN201611197092.2A CN201611197092A CN106598105B CN 106598105 B CN106598105 B CN 106598105B CN 201611197092 A CN201611197092 A CN 201611197092A CN 106598105 B CN106598105 B CN 106598105B
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- resistance
- temperature
- mobile terminal
- variable resistance
- rate
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
Abstract
The present invention relates to technical field of lithium ion, a kind of temperature-control circuit and temprature control method based on mobile terminal, a kind of temperature-control circuit based on mobile terminal are especially arranged, wherein include: the first variable resistance and the second adjustable resistance；First variable resistance is in parallel with load；The second adjustable resistance is connected with power supply.In the present invention, because the first variable resistance R1 is in parallel with load, it is intended to reduce the resistance of the lithium battery C output end in temperature-control circuit, it is simultaneously that shunting processing is implemented in load by the first variable resistance R1, reduce the electric current at load both ends, avoid temperature is excessively high from damaging to load elements, pass through series connection the second adjustable resistance R2 again, improve the all-in resistance of temperature-control circuit, it avoids because the resistance of lithium battery C output end reduces the electric current of temperature-control circuit being increased, reduce the electric energy loss of temperature-control circuit, realizing prevents mobile device temperature excessively high, improve the effect of the safety in utilization of mobile device.
Description
Technical field
The present invention relates to technical field of lithium ion, be especially arranged a kind of temperature-control circuit based on mobile terminal and
Temprature control method.
Background technique
Lithium battery is the abbreviation of lithium ion battery, due to its chemical characteristic, is down to over-discharge piezoelectric voltage VDDL in cell voltage
When for 2.4~2.5V, battery enters over-discharge state, and the protection circuit of general inside battery can be at output locking shape
State.When lithium battery is started to charge from over-discharge state, in order to protect lithium battery not to be damaged, it is necessary to first carry out the pre- of low current
Charging, pre-charge current IPRE are 10~30mA, the minimum work electricity of mobile terminal for reaching 3V or so to lithium battery voltage VBAT
When cell voltage VBATMINON, mobile terminal-opening enters back into the controllable charged state of master controller.
Lithium ion battery is most widely used battery in the modern digital product such as current mobile terminal, laptop,
It can not overcharge in use, over-discharge (battery can be damaged or be allowed to scrap).Therefore, there are protection component or protection electricity on battery
Road is to prevent expensive cell damage.Lithium ion battery charging requirement is very high, it is ensured that final voltage precision within ± 1%,
Major semiconductor devices factory has developed the IC of a variety of lithium ion batteries charging, with guarantee it is safe and reliable, rapidly charge.But
Be lithium ion battery in use, there are the danger of explosion, main reason is that existing in the reaction of inside battery
The process of one " thermal runaway "." thermal runaway " is an energy positive feedback loop process: raised temperature will lead to lithium ion heating,
Lithium ion heating increases temperature, this in turn but also allows lithium ion to become hotter not only, when the temperature of lithium ion is more than predetermined temperature,
Lithium electronics just will appear the danger of explosion.
Summary of the invention
The embodiment of the present invention provides a kind of mobile device temperature-control circuit, it is intended to prevent mobile device temperature excessively high, keep away
Exempt from lithium battery and " thermal runaway " phenomenon occur, improves the safety in utilization of mobile device.
The present invention provides a kind of temperature-control circuit based on mobile terminal, wherein includes: the first variable resistance and second
Variable resistance；
First variable resistance is in parallel with load；
The second adjustable resistance is connected with power supply.
Preferably, above-mentioned a kind of temperature-control circuit based on mobile terminal, wherein first variable resistance is negative
Temperature coefficient of resistance, the second adjustable resistance are positive temperature coefficient resistor.
Preferably, above-mentioned a kind of temperature-control circuit based on mobile terminal, wherein further include a detection unit, use
The operating temperature of the load described in real-time detection, when Yu Suoshu operating temperature is not less than predetermined temperature, according to the operating temperature
A first control signal, second control signal output are formed,
First variable resistance is under the action of the first control signal according to described in preordering method adjustment currently
The first resistor rate of first variable resistance；
The second adjustable resistance is under the action of the second control signal according to described in preordering method adjustment currently
The second resistance rate of the second adjustable resistance.
Preferably, a kind of above-mentioned temperature-control circuit based on mobile terminal, wherein the preordering method are as follows:
Wherein, R1 is first variable resistance；
A is the first resistor rate, and the value range of a is [0,1]；
R2 is the second adjustable resistance；
B is the second resistance rate, and the value range of b is [1 ,+∞]；
U is the rated operational voltage of the mobile terminal；
I is the rated operational voltage of the mobile terminal；
R is the equivalent resistance of the load.
Preferably, a kind of above-mentioned temperature-control circuit based on mobile terminal, wherein the preordering method are as follows:
Wherein: X is the first resistor rate；
Y is the second resistance rate；
TWorkFor the operating temperature；
TIt is predeterminedFor the predetermined temperature.
On the other hand, the present invention provides a kind of temprature control method based on mobile terminal again, wherein includes:
The current operating temperature of the mobile terminal is obtained, and judges whether the operating temperature is less than the predetermined temperature
Degree；
In the operating temperature not less than formation first control signal, the second control letter in the state of the predetermined temperature
Number；
First variable resistance adjusts current described first according to preordering method under the action of the first control signal
The first resistor rate of variable resistance；
The second adjustable resistance adjusts current described second according to preordering method under the action of the second control signal
The second resistance rate of variable resistance.
Preferably, a kind of above-mentioned temprature control method based on mobile terminal, wherein the preordering method are as follows:
Wherein, R1 is first variable resistance；
A is the first resistor rate, and the value range of a is [0,1]；
R2 is the second adjustable resistance；
B is the second resistance rate, and the value range of b is [1 ,+∞]；
U is the rated operational voltage of the mobile terminal；
I is the rated operational voltage of the mobile terminal；
R is the equivalent resistance of the load.
Preferably, a kind of above-mentioned temprature control method based on mobile terminal, wherein the preordering method are as follows:
Wherein: X is the first resistor rate；
Y is the second resistance rate；
TWorkFor the operating temperature；
TIt is predeterminedFor the predetermined temperature.
Preferably, above-mentioned a kind of temprature control method based on mobile terminal, wherein first variable resistance is negative
Temperature coefficient of resistance, the second adjustable resistance are positive temperature coefficient resistor.
Compared with the prior art, the advantages of the present invention are as follows:
In the present invention, because the first variable resistance R1 is in parallel with load, it is intended to which the lithium battery C reduced in temperature-control circuit is defeated
The resistance of outlet, while being that shunting processing is implemented in load by the first variable resistance R1, the electric current at load both ends is reduced, temperature is avoided
It spends height to damage load elements, then by series connection the second adjustable resistance R2, improves the all-in resistance of temperature-control circuit, keep away
Exempt from because the resistance of lithium battery C output end reduces the electric current of temperature-control circuit to be increased.Temperature is higher, the first variable resistance
The resistance value of R1 is smaller, avoids load elements impaired by shunting processing, while the second adjustable resistance R2 resistance value improves, and promotes temperature
The all-in resistance of control circuit reduces the total current of temperature-control circuit, reduces the electric energy loss of temperature-control circuit, realizes anti-
Only mobile device temperature is excessively high, improves the effect of the safety in utilization of mobile device.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the temperature-control circuit based on mobile terminal provided in an embodiment of the present invention；
Fig. 2 is a kind of flow chart of the temprature control method based on mobile terminal provided in an embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
As shown in Figure 1, a kind of temperature-control circuit based on mobile terminal, wherein include: the first variable resistance R1 and
Two variable resistance R2；
The first variable resistance R1 is in parallel with load；Further, the first variable resistance R1 is negative temperature coefficient
Resistance, in the case where mobile terminal is in normal operating conditions, the resistance value of the first variable resistance R1 is intended to infinity.Work as movement
The temperature of terminal is under abnormal condition, and the resistivity of the first variable resistance R1 strongly reduces, i.e. the first variable resistance R1's
Resistance sharply declines, and temperature is higher, and the resistance value of the first variable resistance R1 is smaller, until the resistance value of the first variable resistance R1 is
Zero, in the state that the resistance value of the first variable resistance R1 is zero, (mobile terminal is in addition to a power supply to load by the first variable resistance R1
All circuit elements) implement short-circuit protection.
The second adjustable resistance R2 connects with power supply, and the power supply is lithium battery C, and further, described second is variable
Resistance R2 is positive temperature coefficient resistor, in the case where mobile terminal is in normal operating conditions, the resistance value of the second adjustable resistance R2
It is intended to zero.When the temperature of mobile terminal is under abnormal condition, the resistivity of the second adjustable resistance R2 is steeply risen, i.e., and
The resistance of two variable resistance R2 sharply increases, and temperature is higher, and the resistance value of the second adjustable resistance R2 is bigger.Until second can power transformation
The resistance value for hindering R2 is infinity, in the state that the resistance value of the second adjustable resistance R2 is infinitely great, at entire temperature-control circuit
In off state, temperature controlled electric current is zero at this time, i.e., power consumption is zero, then it is zero that electric energy, which is converted into the conversion ratio of thermal energy, greatly
The temperature of mobile terminal is reduced greatly.
In the present invention, because the first variable resistance R1 is in parallel with load, it is intended to which the lithium battery C reduced in temperature-control circuit is defeated
The resistance of outlet, while being that shunting processing is implemented in load by the first variable resistance R1, the electric current at load both ends is reduced, temperature is avoided
It spends height to damage load elements, then by series connection the second adjustable resistance R2, improves the all-in resistance of temperature-control circuit, keep away
Exempt from because the resistance of lithium battery C output end reduces the electric current of temperature-control circuit to be increased.Temperature is higher, the first variable resistance
The resistance value of R1 is smaller, avoids load elements impaired by shunting processing, while the second adjustable resistance R2 resistance value improves, and promotes temperature
The all-in resistance of control circuit reduces the total current of temperature-control circuit, reduces the electric energy loss of temperature-control circuit, that is, reduces steady
Determine the temperature of control circuit.
As further preferred embodiment, above-mentioned a kind of temperature-control circuit based on mobile terminal, wherein also wrap
A detection unit is included, for the operating temperature of load described in real-time detection, when Yu Suoshu operating temperature is not less than predetermined temperature, root
A first control signal, second control signal output are formed according to the operating temperature,
The first variable resistance R1 adjusts current institute under the action of the first control signal according to preordering method
State the first resistor rate of the first variable resistance R1；
The second adjustable resistance R2 adjusts current institute under the action of the second control signal according to preordering method
State the second resistance rate of the second adjustable resistance R2.
Further, the preordering method are as follows:
Wherein, R1 is first variable resistance；
A is the first resistor rate, and the value range of a is [0,1]；
R2 is the second adjustable resistance；
B is the second resistance rate, and the value range of b is [1 ,+∞]；
U is the rated operational voltage of the mobile terminal；
I is the rated operational voltage of the mobile terminal；
R is the equivalent resistance of the load.
When the first resistor rate a, the second resistance rate b meet 1 condition of above-mentioned formula, then in temperature elevation process
In, the electric current for loading both ends is in steady state, and proof load is in steady-working state.
Embodiment two
In above-mentioned implementation one, realize that load both ends electric current is in steady state by formula one, but the calculating of formula one
Relative complex (generalling use iterative calculation method to calculate one by one), then calculating speed is relatively slow, is based on this, the present invention provides again
A kind of temperature-control circuit based on mobile terminal reduces computation complexity, improves computational efficiency.
A kind of temperature-control circuit based on mobile terminal, wherein include: the first variable resistance R1 and the second adjustable resistance
R2；
The first variable resistance R1 is in parallel with load；Further, the first variable resistance R1 is negative temperature coefficient
Resistance；
The second adjustable resistance R2 connects with power supply, and the power supply is lithium battery C, and further, described second is variable
Resistance R2 is positive temperature coefficient resistor；
Detection unit, for the operating temperature of load described in real-time detection, Yu Suoshu operating temperature is not less than predetermined temperature
When, a first control signal, second control signal output are formed according to the operating temperature,
The first variable resistance R1 adjusts current institute under the action of the first control signal according to preordering method
State the first resistor rate of the first variable resistance R1；
The second adjustable resistance R2 adjusts current institute under the action of the second control signal according to preordering method
State the second resistance rate of the second adjustable resistance R2.
Wherein, the preordering method are as follows:
Wherein: X is the first resistor rate；
Y is the second resistance rate；
TWorkFor the operating temperature；
TIt is predeterminedFor the predetermined temperature.
In the present embodiment, calculate to form the first resistor rate, the second resistance by predetermined temperature and operating temperature
Rate substantially reduces computation complexity, improves protection efficiency.
Embodiment three
As shown in Fig. 2, on the other hand, the present invention provides a kind of temprature control method based on mobile terminal again, wherein packet
It includes:
Step S110, the current operating temperature of the mobile terminal is obtained, and judges whether the operating temperature is less than institute
State predetermined temperature；
Step S120, Yu Suoshu operating temperature is not less than forming first control signal, the in the state of the predetermined temperature
Two control signals；
Step S130, the first variable resistance adjusts currently under the action of the first control signal according to preordering method
The first resistor rate of first variable resistance；
Step S140, the second adjustable resistance adjusts currently under the action of the second control signal according to preordering method
The second resistance rate of the second adjustable resistance.
As further preferred embodiment, above-mentioned a kind of temprature control method based on mobile terminal, wherein described
Preordering method are as follows:
Wherein, R1 is first variable resistance；
A is the first resistor rate, and the value range of a is [0,1]；
R2 is the second adjustable resistance；
B is the second resistance rate, and the value range of b is [1 ,+∞]；
U is the rated operational voltage of the mobile terminal；
I is the rated operational voltage of the mobile terminal；
R is the equivalent resistance of the load.
As further preferred embodiment, above-mentioned a kind of temprature control method based on mobile terminal, wherein described
Preordering method are as follows:
Wherein: X is the first resistor rate；
Y is the second resistance rate；
TWorkFor the operating temperature；
TIt is predeterminedFor the predetermined temperature.
As further preferred embodiment, above-mentioned a kind of temprature control method based on mobile terminal, wherein described
First variable resistance is negative temperature coefficient resister, and the second adjustable resistance is positive temperature coefficient resistor.
Product provided by any embodiment of the invention can be performed in the above method, has and executes the corresponding functional module of product
And beneficial effect.Therefore the working principle of temprature control method is repeated no more herein.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (5)
1. a kind of temperature-control circuit based on mobile terminal characterized by comprising the first variable resistance and second can power transformation
Resistance；
First variable resistance is in parallel with load；
The second adjustable resistance is connected with power supply；
It further include a detection unit, for the operating temperature of load described in real-time detection, Yu Suoshu operating temperature is not less than predetermined
When temperature, a first control signal, second control signal output are formed according to the operating temperature,
First variable resistance adjusts current described first according to preordering method under the action of the first control signal
The first resistor rate of variable resistance；
The second adjustable resistance adjusts current described second according to preordering method under the action of the second control signal
The second resistance rate of variable resistance, in which:
The preordering method are as follows:
Wherein, R1 is first variable resistance；
A is the first resistor rate, and the value range of a is [0,1]；
R2 is the second adjustable resistance；
B is the second resistance rate, and the value range of b is [1 ,+∞]；
U is the rated operational voltage of the mobile terminal；
I is the rated operational voltage of the mobile terminal；
R is the equivalent resistance of the load.
2. a kind of temperature-control circuit based on mobile terminal according to claim 1, which is characterized in that described first can
Power transformation resistance is negative temperature coefficient resister, and the second adjustable resistance is positive temperature coefficient resistor.
3. a kind of temperature-control circuit based on mobile terminal characterized by comprising the first variable resistance and second can power transformation
Resistance；
First variable resistance is in parallel with load；
The second adjustable resistance is connected with power supply；
It further include a detection unit, for the operating temperature of load described in real-time detection, Yu Suoshu operating temperature is not less than predetermined
When temperature, a first control signal, second control signal output are formed according to the operating temperature,
First variable resistance adjusts current described first according to preordering method under the action of the first control signal
The first resistor rate of variable resistance；
The second adjustable resistance adjusts current described second according to preordering method under the action of the second control signal
The second resistance rate of variable resistance, in which: the preordering method are as follows:
Wherein: X is the first resistor rate；
Y is the second resistance rate；
TWorkFor the operating temperature；
TIt is predeterminedFor the predetermined temperature.
4. a kind of temprature control method based on mobile terminal characterized by comprising
The current operating temperature of the mobile terminal is obtained, and judges whether the operating temperature is less than predetermined temperature；
In the operating temperature not less than formation first control signal, second control signal in the state of the predetermined temperature；
It is variable that first variable resistance adjusts current described first according to preordering method under the action of the first control signal
The first resistor rate of resistance；
It is variable that the second adjustable resistance adjusts current described second according to preordering method under the action of the second control signal
The second resistance rate of resistance, wherein the preordering method are as follows:
Wherein, R1 is first variable resistance；
A is the first resistor rate, and the value range of a is [0,1]；
R2 is the second adjustable resistance；
B is the second resistance rate, and the value range of b is [1 ,+∞]；
U is the rated operational voltage of the mobile terminal；
I is the rated operational voltage of the mobile terminal；
R is the equivalent resistance of the load.
Alternatively, the preordering method are as follows:
Wherein: X is the first resistor rate；
Y is the second resistance rate；
TWorkFor the operating temperature；
TIt is predeterminedFor the predetermined temperature.
5. a kind of temprature control method based on mobile terminal according to claim 4, which is characterized in that described first can
Power transformation resistance is negative temperature coefficient resister, and the second adjustable resistance is positive temperature coefficient resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611197092.2A CN106598105B (en) | 2016-12-22 | 2016-12-22 | A kind of temperature-control circuit and temprature control method based on mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611197092.2A CN106598105B (en) | 2016-12-22 | 2016-12-22 | A kind of temperature-control circuit and temprature control method based on mobile terminal |
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| Publication Number | Publication Date |
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| CN106598105A CN106598105A (en) | 2017-04-26 |
| CN106598105B true CN106598105B (en) | 2019-09-24 |
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| CN103208824B (en) * | 2012-01-16 | 2016-12-07 | 华为终端有限公司 | A kind of charging circuit and charger |
| CN104377660B (en) * | 2013-08-13 | 2019-11-26 | 中兴通讯股份有限公司 | A kind of mobile terminal charging temperature guard method and device |
| CN104617571B (en) * | 2015-01-20 | 2018-01-09 | 长沙飞波通信技术有限公司 | A kind of electronic electric equipment over-voltage and over-current protector |
| CN106249800B (en) * | 2016-09-22 | 2017-11-07 | 苏州佳世达电通有限公司 | Overheating protection circuit and the electronic installation with overheat protective function |
| CN107037839A (en) * | 2016-11-11 | 2017-08-11 | 上海与德信息技术有限公司 | A kind of mobile device temperature-control circuit |
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