CN101771428A - Temperature detection circuit and mobile communication equipment - Google Patents
Temperature detection circuit and mobile communication equipment Download PDFInfo
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- CN101771428A CN101771428A CN201010100894A CN201010100894A CN101771428A CN 101771428 A CN101771428 A CN 101771428A CN 201010100894 A CN201010100894 A CN 201010100894A CN 201010100894 A CN201010100894 A CN 201010100894A CN 101771428 A CN101771428 A CN 101771428A
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Abstract
The invention discloses a temperature detection circuit and a mobile communication equipment, comprising a divider circuit consisting of a thermal resistor and a fixed resistor connected together, wherein, the dividing point of the divider circuit is connected with a voltage detection unit; when detecting that the voltage value at the dividing point reaches the preset temperature alarm voltage valve, the voltage detection unit outputs an alarm signal to an application processor to close part of or the whole circuit in the system by the application processor in order to reduce the temperature of the whole machine. With a simple structure, the temperature detection circuit of the invention realizes timely detection of the whole system temperature and guarantees security of equipment using process, particularly applicable to the mobile communication equipment, such as the mobile phone and the PDA, with characteristics of high electricity consumption and concentrated heating when the system is in operation.
Description
Technical field
The invention belongs to the mobile communication equipment technical field, specifically, the mobile communication equipment that relates to a kind of circuit design scheme that circuit system temperature in the mobile communication equipment is detected and adopt described temperature sensing circuit design.
Background technology
Along with improving constantly and characteristics that multithreading is worked simultaneously of smart mobile phone operation dominant frequency on the market, " heating " becomes the major issue that the smart mobile phone field faces.And in recent years, constantly hear the message that transmits the battery of mobile phone blast on the market or catch fire, therefore, temperature detection and the self-protective mechanism of smart mobile phone under limiting temperature seems particularly important.
At present, the chip of majority with MCU (Micro Controller Unit) function all classified temperature protection one of as its function on the market.Usually these chips have a high temperature protection point, mostly at 120 ℃ or higher.When the temperature of chip surpassed the high temperature protection point that is provided with, MCU can close some functions step by step and cut off the power supply automatically up to all circuit of chip internal, contained the potential hazard that the continuous temperature that raises of chip is brought to complete machine with this.Yet these temperature set points are during often at chip internal short circuit or load short circuits, and a large amount of heating situations of moment chip self of generation are provided with, and they only are provided with protection scheme at chip self, rather than carry out temperature protection at complete machine.In mobile phone circuit, a lot of ancillary equipment, device such as battery, LCD display for example, its safe working temperature is usually below 60 ℃, in case surpass this temperature, the hidden danger damaging even explode may appear in the part peripheral hardware.At this moment, himself the high temperature protection point of chip with MCU function can't play a role at all, therefore, also needs to design the temperature that special temperature sensing circuit detects complete machine, thereby makes the use of mobile phone safer.
Field of mobile phones is carried out the common method of temperature detection: have a NTC thermistor at mobile phone cell inner, pull-up resistor in this NTC thermistor and the mobile phone circuit forms a bleeder circuit, when the temperature of battery raise, the resistance of NTC thermistor reduced thereupon; Otherwise when the temperature of battery reduced, the resistance of NTC thermistor then can increase.Utilize this mechanism of NTC thermistor, carry out dividing potential drop by resistance and the NTC thermistor that adopts a fixed resistance value, under the different temperatures, the resistance of NTC constantly changes, so partial pressure value also constantly changes thereupon.Utilize this partial pressure value and temperature to concern one to one, promptly can judge the current temperature value of complete machine, theory diagram is referring to shown in Figure 1.
For the sample detecting of above-mentioned partial pressure value, in the design of present mobile phone circuit, generally all be to adopt the analog to digital converter ADC interface of application processor to connect the dividing potential drop node of above-mentioned bleeder circuit, read partial pressure value and carry out temperature detection.But this design needs application processor often to start the dividing potential drop that analog to digital converter ADC goes to read NTC thermistor two ends, thereby causes the increase greatly of Overall Power Consumption.
Based on above situation, the detection that how to realize complete machine temperature in mobile phone circuit becomes a problem that is worth research, need allly multifactorly comprehensively consider complete machine cost, development difficulty, stability, mobile telephone power consumption and detection time etc.
Summary of the invention
The present invention is in order to solve existing mobile phone temp testing circuit and to adopt application processor to gather and judging system temperature, the big problem of the Overall Power Consumption that is brought thus, provide a kind of power consumption temperature sensing circuit little, simple in structure, realized timely, the reliable Detection of complete machine temperature.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of temperature sensing circuit comprises the bleeder circuit that is connected to form by thermistor and fixed resistance; The dividing potential drop node of described bleeder circuit connects a voltage detection unit, described voltage detection unit is when detecting dividing potential drop voltages at nodes value and reach the temperature alarming magnitude of voltage of setting, output alarm signal is to application processor, by the some or all of circuit in the application processor shutdown system, to reduce complete machine temperature.
Preferably, described thermistor can be the thermistor of system battery inside or the independent thermistor that is placed on system battery.
As a kind of design wherein, when described temperature sensing circuit was applied in the mobile communication equipment, described voltage detection unit can adopt the communication module in the mobile communication equipment to realize; Described communication module utilizes its ADC interface to connect the dividing potential drop node of described bleeder circuit, after reading dividing potential drop voltages at nodes value and carrying out analog-to-digital conversion process, compare with the temperature alarming magnitude of voltage of preserving, when arriving the temperature alarming magnitude of voltage, the application processor of output alarm signal to the mobile communication equipment.
Further, in order to reduce power consumption, the magnitude of voltage that described communication module reads according to its ADC interface and the degree of closeness of temperature alarming magnitude of voltage, dynamically adjust the reading frequency of its ADC interface, the absolute value of difference of following the magnitude of voltage that reads and temperature alarming magnitude of voltage is more little, the rule that the reading frequency of ADC interface is fast more.Promptly during away from the temperature alarming magnitude of voltage, reduce the reading frequency of ADC interface, to reduce energy consumption at the magnitude of voltage that reads; And during near the temperature alarming magnitude of voltage, increase the reading frequency of ADC interface at the magnitude of voltage that reads, so that when complete machine temperature arrives the limiting value of setting, communication module is output alarm signal in time, lowers the temperature rapidly with the cut-off parts circuit.
As another design, described voltage detection unit can adopt a comparator to design, wherein one road input of described comparator connects the dividing potential drop node of described bleeder circuit, other one road input receives temperature alarming voltage, the output of comparator connects application processor, compare by two-way analog voltage signal, to produce and output alarm signal input.
As the third design, described voltage detection unit can also adopt an analog to digital converter design to realize, the input that is about to analog to digital converter connects the dividing potential drop node of described bleeder circuit, read magnitude of voltage and be converted to digital signal and the temperature alarming magnitude of voltage of preservation compares, when arriving the temperature alarming magnitude of voltage, output alarm signal is to application processor.
Further again, in order to realize that no matter application processor still is that resting state can both in time respond high temperature alarm in running status, described application processor preferably connects the output of described voltage detection unit by its communication pin that is used to receive wake-up signal, receive alarm signal.
Based on said temperature testing circuit structure, the present invention provides a kind of mobile communication equipment that adopts described temperature sensing circuit design again, comprise battery, application processor and communication module, by the thermistor in the battery or be independent of the external thermistor of battery and the fixed resistance in the mobile communication equipment constitutes bleeder circuit, utilize thermistor constantly to change the characteristic of its resistance with the variation of complete machine temperature, produce the magnitude of voltage of reflection variations in temperature, and then export by the dividing potential drop node of described bleeder circuit; Utilize the voltage detection unit of low-power consumption then, such as gathering described dividing potential drop voltages at nodes value, and then compare with the temperature alarming voltage of setting by devices such as the comparator of existing communication module or additional configuration in the mobile communication equipment or analog to digital converters; When the magnitude of voltage that reads arrives described temperature alarming voltage, produce the application processor that alarm signal exports mobile communication equipment to, with the some or all of circuit in the notice application processor cut-out system in time,, reduce complete machine temperature to reduce system power dissipation as early as possible.
Compared with prior art, advantage of the present invention and good effect are: temperature sensing circuit of the present invention is simple in structure, under the prerequisite that does not increase or increase few system power dissipation, realized the timely detection of system's complete machine temperature, guaranteed the safety of equipment use, in the mobile communication equipment that power consumption is big when especially being fit to be applied to system works, heating is concentrated, such as mobile phone, palmtop PC PDA etc.
After reading the detailed description of embodiment of the present invention in conjunction with the accompanying drawings, other characteristics of the present invention and advantage will become clearer.
Description of drawings
Fig. 1 is the theory diagram of existing mobile phone temp detection method;
Fig. 2 is the theory diagram of temperature sensing circuit proposed by the invention;
Fig. 3 is the circuit theory diagrams of first kind of embodiment of temperature sensing circuit proposed by the invention;
Fig. 4 is the circuit theory diagrams of second kind of embodiment of temperature sensing circuit proposed by the invention;
Fig. 5 is the circuit theory diagrams of the third embodiment of temperature sensing circuit proposed by the invention;
Fig. 6 is the circuit theory diagrams of the 4th kind of embodiment of temperature sensing circuit proposed by the invention;
Fig. 7 is the circuit theory diagrams of the 5th kind of embodiment of temperature sensing circuit proposed by the invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.
The characteristics that power consumption is big, heating is concentrated when the present invention is directed to mobile communication equipment work make every effort to build form do not increase under the prerequisite of system power dissipation as far as possible by simple circuit, realize the complete machine temperature testing mechanism of system.
Fig. 2 is the structure schematic diagram of temperature sensing circuit proposed by the invention, its design philosophy is: utilize the resistance R 1 of a fixed resistance value in a thermistor and the system to constitute bleeder circuit, make up described bleeder circuit such as adopting NTC thermistor NTC1 built-in in the system battery or being independent of the independent NTC thermistor NTC2 that is provided with of battery, as shown in Figure 2.One end ground connection of NTC thermistor, the other end is by wherein one tunnel DC power supply Vio in the fixed resistance R1 connected system, being used to of its dividing potential drop node output reflects that the magnitude of voltage that system's complete machine temperature changes can adopt the voltage detection unit of a low-power consumption to gather in real time or read, and then compare with predefined temperature alarming magnitude of voltage, when rising along with complete machine temperature, the resistance of NTC thermistor NTC1 or NTC2 reduces gradually, thereby make when dividing potential drop voltages at nodes value drops to the temperature alarming magnitude of voltage of setting gradually, the voltage detection unit output alarm signal is to application processor, with the partial circuit in the control system or whole down circuitry, and then reduction system power dissipation, make that thus complete machine temperature descends rapidly, to avoid that circuit system is caused damage, make the use of equipment safer.
Certainly, described thermistor also can adopt the PTC thermistor that raises gradually with temperature rising resistance to design described bleeder circuit, this moment, dividing potential drop voltages at nodes value presented the trend that raises and increase gradually with complete machine temperature, when designed voltage detection unit is elevated to the temperature alarming magnitude of voltage that sets gradually at the magnitude of voltage that reads, to the application processor output alarm signal.But, adopt this bleeder circuit design can cause the further increase of system power dissipation, therefore the further rising of temperature is not advised using.
Be example below with the mobile phone, thermistor adopts the form of NTC thermistor, elaborates the concrete establishment structure and the course of work thereof of described temperature sensing circuit by a plurality of specific embodiments.
Embodiment one, referring to shown in Figure 3, mobile phone circuit at present embodiment, for under the prerequisite that does not increase the mobile phone hardware cost, realization is to effective detection of mobile phone temp,, realize the timing of the dividing potential drop node place magnitude of voltage of bleeder circuit is detected as voltage detection unit by the communication module of mobile phone inside.
As shown in Figure 3, built-in NTC thermistor NTC1 makes up the required bleeder circuit of temperature sensing circuit in the employing battery of mobile phone.The end ground connection of thermistor NTC1, the other end connects the ID terminal of battery.The ID terminal of battery connects in the cell phone system wherein one road galvanic current source by fixed resistance R1, carry out direct current power source supplying power Vio such as the GPIO mouth that is used for application processor, the ID terminal of battery is specifically designed to the ADC interface that reads analog voltage signal in the dividing potential drop node connection communication module as bleeder circuit simultaneously.Described communication module reads dividing potential drop voltages at nodes value by its ADC interface, represents with V1, i.e. the partial pressure value at temperature-sensitive resistance NTC1 two ends is to obtain the temperature of current battery indirectly.Communication module (is the pairing numerical value of temperature alarming voltage by magnitude of voltage V1 that will read and the temperature alarming magnitude of voltage Vref that preserves in advance, the pairing magnitude of voltage of limiting temperature just) compares, judge so that whether complete machine temperature is reached the limit of temperature.
For power saving, communication module not can state of temperature real-time inform application processor, but only when the magnitude of voltage V1 that reads arrives temperature alarming magnitude of voltage Vref, output alarm signal is to the application processor of mobile phone, and notice application processor mobile phone Current Temperatures is too high.At this moment, the circuitry cuts order that application processor meeting basis is set is in advance sent partial circuit or whole circuit in the control command cut-out cell phone system, to reduce power consumption, reduces temperature, guarantees the fail safe of mobile phone use.
In order to reach the purpose of design of further reduction system power dissipation, present embodiment preferably carries out particular design to the frequency that communication module reads dividing potential drop voltages at nodes value V1, be communication module magnitude of voltage V1 that can read according to its ADC interface and the degree of closeness of temperature alarming magnitude of voltage Vref, dynamically adjust the reading frequency of its ADC interface.In general, the absolute value of difference that should follow the magnitude of voltage V1 that reads and temperature alarming magnitude of voltage Vref is more little, the rule that the reading frequency of communication module ADC interface is fast more.Promptly during away from temperature alarming magnitude of voltage Vref, reduce the reading frequency of ADC interface, to reduce energy consumption at the magnitude of voltage V1 that reads; And at the magnitude of voltage V1 that reads during near temperature alarming magnitude of voltage Vref, increase the reading frequency of ADC interface, so that when complete machine temperature arrived the limiting temperature of setting, communication module is output alarm signal in time, with notice application processor cut-off parts or all circuit, coolings rapidly.
The notion of introducing absolute value is for following consideration:
For the bleeder circuit that adopts the design of NTC thermistor as shown in Figure 3, because system is when operate as normal, V1＞Vref in the overwhelming majority time, therefore at V1 during much larger than Vref, can set a slower reading frequency, such as reading primary voltage value V1 per 10 seconds, reach the purpose of design that reduces power consumption.And when V1 reduces gradually and approaches Vref, during such as V1-Vref=1, in order to realize timely warning, should set a reading frequency faster, such as reading primary voltage value V1 per 1 second, can when reaching the limit of temperature, complete machine temperature make a response in time to guarantee application processor.
And for the bleeder circuit that adopts the design of PTC thermistor since in most times of the normal operation of system V1＜Vref, therefore during much smaller than Vref, can set a slower reading frequency and reach the purpose of design that reduces power consumption at V1.And when V1 increases gradually and approaches Vref, during such as V1-Vref=-1, should set a reading frequency faster, guarantee the response speed of application processor execution power-off protection.
In the present embodiment, described communication module can be by the corresponding connection of the corresponding interface with application processor of UART interface or GPIO interface, to be used to transmit alarm signal.Certainly, present embodiment is not limited in above giving an example to the transmission form of alarm signal.
Adopt embodiment one described design, the problem that the standby current that can allow application processor break away to read magnitude of voltage V1 to be caused increases, and can the operating time of complete machine not exerted an influence.Shortcoming is the debug process relative complex, needs communication module to obtain temperature information earlier, order data that regeneration is corresponding with it or pulse signal notice application processor; Secondly, at present many mobile phones only just can be realized the start operation of mobile phone by charger, and this circuit structure is not having under the situation of battery, can't the temperature of complete machine be read.
In order to solve in the effective detection that does not have complete machine temperature under the situation of battery, can adopt design shown in Figure 4, being about to NTC thermistor NTC1 breaks away from from battery, independently NTC thermistor NTC2 and fixed resistance R1 form bleeder circuit by one, its dividing potential drop node is directly connected on the ADC interface of communication module, utilize the ADC interface that reads voltage specially of communication module to carry out the detection of magnitude of voltage V1, thereby obtain the temperature of current battery indirectly.
In like manner, consider that the communication module in this circuit is preferred only when Current Temperatures reaches the limiting condition of setting, just passes through its UART interface or GPIO interface output alarm signal, notifies application processor current state of temperature for power saving.In addition, communication module reads the frequency of dividing potential drop voltages at nodes value V1 and also preferably follows above-mentioned rule, i.e. magnitude of voltage V1 that reads according to its ADC interface and the degree of closeness of temperature alarming magnitude of voltage Vref, the mode of dynamically adjusting the reading frequency of its ADC interface designs.
Adopt design shown in Figure 4,, can the temperature of complete machine be detected no matter whether have battery; Shortcoming is the debug process relative complex, and needs to increase an extra NTC thermistor NTC2, thereby makes the hardware cost of complete machine increase.
Embodiment two, referring to shown in Figure 5, present embodiment is used for reference the design philosophy that the dynamic adjustment ADC interface that proposes among the embodiment one reads the partial pressure value V1 of bleeder circuit, come the software program of application processor is revised in right amount, can adopt existing temperature sensing circuit structure like this, promptly utilize the ADC interface of application processor in the mobile phone directly to read dividing potential drop voltages at nodes value V1 in the bleeder circuit, the timing of carrying out the circuitry Current Temperatures detects.
Adopt this design principle simple, need judge state of temperature owing to only relate to chip of application processor, therefore debugging is simple, in stable condition.Shortcoming is that the ADC interface of application processor need periodically carry out the detection of magnitude of voltage V1, even thereby under mobile phone is in holding state, also need periodically to start its ADC interface and remove to read magnitude of voltage V1, thereby improved the standby current of mobile phone, reduced the service time of complete machine.
And embodiment one adopts communication module to carry out the detection of magnitude of voltage V1, then can utilize communication module under mobile phone is in holding state, to need time opening, carry out the characteristic of information interaction with the base station, carry out the process that reads of magnitude of voltage V1 simultaneously, thereby help further to reduce the stand-by power consumption of complete machine.
Embodiment three, and referring to shown in Figure 6, the mobile phone circuit of present embodiment adopts comparator to come the design voltage detecting unit.After the resistance R 1 of the ID terminal of battery and fixed resistance value is connected to form bleeder circuit, be connected to simultaneously independently on the voltage comparator, in-phase input end such as comparator, the inverting input of comparator connects reference level, be the pairing temperature alarming voltage of temperature alarming magnitude of voltage, represent with Vref equally.The output of comparator connects application processor, and for example the GPIO mouth of application processor transmits alarm signal.
Its operation principle is: when the variations in temperature of battery causes the magnitude of voltage V1 at thermistor NTC1 two ends to be reduced to temperature alarming voltage Vref, the output level generation saltus step of comparator, thereby produce the GPIO mouth that low level alarm signal transfers to application processor, surpassed limiting temperature with notice application processor Current Temperatures, should the cut-off parts circuit to reduce complete machine temperature.
After the connected mode of voltage V1, Vref and comparator input terminal was exchanged, then application processor should carry out the outage action of high temperature protection again after the alarm signal of the saltus step from low to high that receives comparator output.
The advantage of this design comprises: at first, can realize that real-time state of temperature detects, because the output level of comparator is converted to hardware mechanisms, and can be in running order always and the standby of complete machine do not exerted an influence; Secondly, the ripe scheme of comparator is numerous, and cost is also low; Its three, the comparator scheme has only taken a GPIO mouth of application processor, application processor only can learn by the current level state of judging the GPIO mouth whether Current Temperatures exceeds standard, and debug process is simple and reliable.
The shortcoming of this programme is: at first, additionally increased device, caused the rising of complete machine hardware cost; Secondly, comparator only can be realized unidirectional temperature detection (promptly or high temperature detects, or low temperature detection); Once more, the comparator scheme can only judge whether Current Temperatures exceeds standard, and can not learn what value actual temp has reached; At last, this circuit is not having under the situation of battery, can't the temperature of complete machine be read, but can adopt the mode of Fig. 4 design thermal resistance NTC2 to solve this problem.
Embodiment four, and referring to shown in Figure 7, the mobile phone circuit of present embodiment adopts an independently analog to digital converter, and promptly the ADC chip designs described voltage detection unit.
After the resistance R 1 of the ID terminal of battery and fixed resistance value is connected to form bleeder circuit, be connected to the input of ADC chip simultaneously, the output of ADC chip connects application processor, the transmission current temperature value.Specifically can pass through I
2C bus or UART serial signal line realize being connected between ADC chip and the application processor.
Its operation principle is: the ADC chip reads dividing potential drop voltages at nodes value V1 in the bleeder circuit in real time, compares with its inner temperature alarming magnitude of voltage Vref that preserves in advance, whether reaches the limit of temperature to judge complete machine temperature.When the magnitude of voltage V1 that reads when the ADC chip arrived temperature alarming magnitude of voltage Vref, the ADC chip produced an interruption, passes through I thereupon
2C bus or UART serial signal line feed back to application processor with Current Temperatures, inform the temperature regime that the application processor mobile phone is current; Perhaps directly produce one and interrupt alarm signal, the notice application processor is carried out the outage action of high temperature protection immediately.
The advantage of this design is: at first, the ADC chip can be in running order always owing to its extremely low power consumption, can realize that therefore real-time state of temperature detects; Secondly the ADC chip only just produces after state of temperature exceeds set point and interrupts; and by interface notice application processor; the parameter that application processor returns according to the ADC chip decides takes for which kind of safeguard measure, the whole mechanism little power consumption, and debug process is simple and reliable.
The shortcoming of this programme is: at first, increased the hardware cost of complete machine; Secondly, this circuit is not having under the situation of battery, can't the temperature of complete machine be read; Certainly, can adopt the mode of Fig. 4 design thermal resistance NTC2 to solve this problem equally.
In order to realize that no matter application processor still is that holding state can both in time respond the high temperature alarm signal in running status, described application processor preferably adopts its communication pin that is used to receive wake-up signal under holding state to connect the output of the voltage detection unit of the various embodiments described above, to receive the alarm signal of voltage detection unit output.
Certainly; the above only is several preferred implementation of the present invention; should be noted that; for those skilled in the art; under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a temperature sensing circuit is characterized in that: comprise the bleeder circuit that is connected to form by thermistor and fixed resistance; The dividing potential drop node of described bleeder circuit connects a voltage detection unit, described voltage detection unit is when detecting dividing potential drop voltages at nodes value and reach the temperature alarming magnitude of voltage of setting, output alarm signal is to application processor, by the some or all of circuit in the application processor shutdown system.
2. temperature sensing circuit according to claim 1 is characterized in that: described thermistor is the thermistor of system battery inside or the independent thermistor that is placed on system battery.
3. temperature sensing circuit according to claim 2 is characterized in that: described temperature sensing circuit is applied in the mobile communication equipment, and described voltage detection unit is the communication module in the mobile communication equipment; Described communication module utilizes its ADC interface to connect the dividing potential drop node of described bleeder circuit, after reading dividing potential drop voltages at nodes value and carrying out analog-to-digital conversion process, compare with the temperature alarming magnitude of voltage of preserving, when arriving the temperature alarming magnitude of voltage, the application processor of output alarm signal to the mobile communication equipment.
4. temperature sensing circuit according to claim 3, it is characterized in that: the magnitude of voltage that described communication module reads according to its ADC interface and the degree of closeness of temperature alarming magnitude of voltage, dynamically adjust the reading frequency of its ADC interface, the absolute value of difference of following the magnitude of voltage that reads and temperature alarming magnitude of voltage is more little, the rule that the reading frequency of ADC interface is fast more.
5. temperature sensing circuit according to claim 2, it is characterized in that: described voltage detection unit is a comparator, wherein one road input of described comparator connects the dividing potential drop node of described bleeder circuit, other one road input receives temperature alarming voltage, the output of comparator connects application processor, output alarm signal.
6. temperature sensing circuit according to claim 2, it is characterized in that: described voltage detection unit is an analog to digital converter, input connects the dividing potential drop node of described bleeder circuit, read magnitude of voltage and be converted to digital signal and the temperature alarming magnitude of voltage of preservation compares, when arriving the temperature alarming magnitude of voltage, output alarm signal is to application processor.
7. according to each described temperature sensing circuit in the claim 1 to 6, it is characterized in that: described application processor connects the output of described voltage detection unit by its communication pin that is used to receive wake-up signal, receives alarm signal.
8. a mobile communication equipment comprises battery and application processor, it is characterized in that: also be provided with the bleeder circuit that is connected to form by thermistor and fixed resistance in described mobile communication equipment; The dividing potential drop node of described bleeder circuit connects a voltage detection unit, described voltage detection unit is when detecting dividing potential drop voltages at nodes value and reach the temperature alarming magnitude of voltage of setting, output alarm signal is to application processor, by the some or all of circuit in the application processor shutdown system.
9. mobile communication equipment according to claim 8 is characterized in that: described voltage detection unit is the communication module in the mobile communication equipment; Described communication module utilizes its ADC interface to connect the dividing potential drop node of described bleeder circuit, after reading dividing potential drop voltages at nodes value and carrying out analog-to-digital conversion process, compares with the temperature alarming magnitude of voltage of preserving; The magnitude of voltage that described communication module reads according to its ADC interface and the degree of closeness of temperature alarming magnitude of voltage, dynamically adjust the reading frequency of its ADC interface, the absolute value of difference of following the magnitude of voltage that reads and temperature alarming magnitude of voltage is more little, the rule that the reading frequency of ADC interface is fast more; When the magnitude of voltage that reads arrived the temperature alarming magnitude of voltage, output alarm signal was to application processor.
10. mobile communication equipment according to claim 8, it is characterized in that: described voltage detection unit is a comparator or analog to digital converter, the dividing potential drop node that connects described bleeder circuit, reading magnitude of voltage compares with temperature alarming voltage, when arriving temperature alarming voltage, output alarm signal is to application processor.
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Address after: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Applicant after: Qingdao Hisense Mobile Communication Technology Co., Ltd. Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Applicant before: Qingdao Hisense Mobile Communication Technology Co., Ltd. |
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Application publication date: 20100707 |