CN110132444A - Temperature sensing circuit - Google Patents
Temperature sensing circuit Download PDFInfo
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- CN110132444A CN110132444A CN201810129269.8A CN201810129269A CN110132444A CN 110132444 A CN110132444 A CN 110132444A CN 201810129269 A CN201810129269 A CN 201810129269A CN 110132444 A CN110132444 A CN 110132444A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention provides a kind of temperature sensing circuit, it include: controllable current source module, current source regulation module, thermistor and ADC module, wherein, controllable current source module has multiple electric current gears, the electric current of one of gear is exported under the control of current source regulation module, which generates a detectable voltage signals on thermistor；Current source regulation module goes control controllable current source module to export the electric current of one of gear of multiple electric current gears, detectable voltage signals is made to meet the input range of ADC module for exporting control signal according to detectable voltage signals；ADC module, for releasing temperature according to detectable voltage signals are counter when detectable voltage signals meet input range.The present invention can expand temperature detection range.
Description
Technical field
The present invention relates to field of circuit technology more particularly to a kind of temperature sensing circuits.
Background technique
In order to guarantee the work safety of cell phone apparatus, intelligent terminal or battery etc., can temperature to these equipment into
Row detection.What application was most at present is realized by electric resistance partial pressure scheme, and specific temperature sensing circuit is as shown in Figure 1, pull-up
Resistance R1 and NTC (negative temperature coefficient) thermistor series connection is between power supply VCC and ground, and ADC module is according to NTC thermistor
On voltage VOUT, current temperature counter can be released, to realize temperature detection.
In the implementation of the present invention, inventor's discovery at least has the following technical problems in the prior art:
Since power supply and pull-up resistor are fixed, when range of temperature is larger, the resistance value of thermistor is one
A very wide range is also a very wide range so as to cause the voltage value in NTC thermistor, it is possible to have exceeded ADC
The detection range of module, therefore the detectable temperature range of existing temperature sensing circuit is smaller.
Summary of the invention
Temperature sensing circuit provided by the invention can expand temperature detection range.
The present invention provides a kind of temperature sensing circuit, comprising: controllable current source module, current source regulation module, temperature-sensitive electricity
Resistance and ADC module, wherein
The controllable current source module has multiple electric current gears, exports under the control of the current source regulation module
The electric current of one of gear；
One end of the thermistor is grounded, and the other end is connect with the output end of the controllable current source module, utilizes institute
The electric current for stating the output of controllable current source module generates a detectable voltage signals；
The current source regulation module, for exporting control signal, the control signal according to the detectable voltage signals
The electric current for exporting one of gear of multiple electric current gears for controlling the controllable current source module, makes the detection voltage
Signal meets the input range of the ADC module；
The ADC module, when for meeting the input range of the ADC module when the detectable voltage signals, according to institute
State that detectable voltage signals are counter to release temperature.
Optionally, the controllable current source module includes a plurality of current source branch in parallel, and different current source branch is used
In the electric current of output different stalls, the input of current source branch described in each item is terminated at a bit, forms the first common end, and described the
One common end connects to power supply, and the output of current source branch described in each item is terminated at a bit, the second common end of formation, and described second
Common end is connect with the thermistor.
Optionally, using a wherein current source branch for a plurality of current source branch as benchmark branch, the benchmark branch
The output electric current on road is benchmark electric current, a part of branch in remaining each current source branch on the basis of the reference current,
Output electric current is successively increased, another part branch is sequentially reduced output electric current on the basis of the reference current.
Optionally, the current source branch includes current source and N-type metal-oxide-semiconductor, the input terminal of the current source and the electricity
Source connection, the output end of the current source are connect with the drain electrode of the N-type metal-oxide-semiconductor, described in the grid access of the N-type metal-oxide-semiconductor
The control signal of current source regulation module output, the source electrode of the N-type metal-oxide-semiconductor are connect with the thermistor.
Optionally, the current source regulation module includes first voltage comparator, second voltage comparator and logical operation
Unit, wherein
The first voltage comparator is used for the detectable voltage signals and first threshold signal, when the detection
When voltage signal is less than the first threshold signal, the first voltage comparator exports high level signal, when the detection electricity
When signal being pressed to be greater than the first threshold signal, the first voltage comparator exports low level signal；
The second voltage comparator is used for the detectable voltage signals and second threshold signal, when the detection
When voltage signal is greater than the second threshold signal, the second voltage comparator exports high level signal, when the detection electricity
When signal being pressed to be less than the second threshold signal, the second voltage comparator exports low level signal, wherein first threshold
Value signal is less than the second threshold signal；
The logical unit, level signal and second electricity for being exported according to the first voltage comparator
The level signal of comparator output is pressed, the control signal including one group of level signal is generated, the control signal is more for connecting
A wherein current source branch for current source branch described in item.
Optionally, the logical unit is also used to export the control including one group of level signal by default
Signal, the control signal is for connecting the benchmark branch.
Optionally, the controllable current source module and the current source regulation module are integrated in a chip.
Temperature sensing circuit provided by the invention selects a wherein branch connection from a plurality of current source branch, makes this
The voltage that current source branch generates on thermistor meets the input range of ADC module, by the switching of current source branch,
It can guarantee within the scope of a very wide temperature, the voltage value on thermistor meets the input range of ADC module always, with
The prior art is compared, and is solved the problems, such as that temperature detection section is narrow, is expanded temperature detection range.Further, due to will be hot
Quick ohmically voltage value is limited in a most reasonable range, and temperature detecting precision is high.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of existing temperature sensing circuit；
Fig. 2 is the structural schematic diagram of one embodiment of temperature sensing circuit of the invention；
Fig. 3 is the structural schematic diagram of another embodiment of temperature sensing circuit of the invention；
Fig. 4 is the structural schematic diagram of the further embodiment of temperature sensing circuit of the invention；
Fig. 5 is the operation principle schematic diagram of temperature sensing circuit of the invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
It is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The embodiment of the present invention provides a kind of temperature sensing circuit, as shown in Figure 2, comprising: controllable current source module 21, electric current
Source adjustment module 22, thermistor 23 and ADC module 24, wherein
Controllable current source module 21 has multiple electric current gears, by the control of current source regulation module 22, in current source tune
Save the electric current that one of gear is exported under the control of module 22；
Thermistor 23 using negative temperature coefficient (NTC) thermistor, thermistor 23 one end ground connection, the other end with
The output end of controllable current source module 21 connects, and generates a detection voltage using the electric current that controllable current source module 21 exports and believes
Number VOUT；
Current source regulation module 22, for exporting control signal CUR_SEL, control letter according to detectable voltage signals VOUT
Number CUR_SEL is used to control the electric current for one of gear that controllable current source module 21 exports multiple electric current gears, makes to detect
Voltage signal VOUT meets the input range of ADC module 24；
ADC module 24, when for meeting the input range of ADC module 24 as detectable voltage signals VOUT, according to detection electricity
Signal VOUT is counter releases temperature for pressure.
In actual design, controllable current source module 21 and current source regulation module 22 can be integrated in a core by us
In piece.
Optionally, controllable current source module 21 includes a plurality of current source branch in parallel, and different current source branch is used for
Export different stalls electric current, the input of each current source branch be terminated at a bit, formed the first common end, the first common end with
Power supply connection, the output of each current source branch are terminated at a bit, form the second common end, and the second common end and thermistor connect
It connects.
Assuming that controllable current source module 21 exportable I0, I0/2, I0/2 under the control of current source regulation module 222, I0/
23... ... and I0*2, I0*22,I0*23... ... the electric current of multiple gears, the corresponding current source branch of each gear, wherein
Using export electric current for I0 current source branch as benchmark branch, i.e., with I0 be default gear electric current and reference current, remaining
The electric current of gear is increased or is reduced by 2 exponential function on the basis of I0.
As shown in figure 3, every current source branch includes current source and N-type metal-oxide-semiconductor, electricity by taking three current source branch as an example
The input terminal in stream source is connect with power supply VCC, and the output end of current source is connect with the drain electrode of N-type metal-oxide-semiconductor, and the grid of N-type metal-oxide-semiconductor connects
Enter the control signal of the output of current source regulation module 22, the source electrode of N-type metal-oxide-semiconductor is connect with thermistor.
In the embodiment, current source included by three different current source branch exports different electric currents respectively, remembers respectively
It is benchmark electric current for I0, I0/2 and I0*2, I0, control signal includes three level signals, controls three different electric currents respectively
N-type metal-oxide-semiconductor included by the branch of source, only one in three level signals is high level signal, remaining is all low level signal,
A current source branch is only connected to ensure that.Under default situations, the current source branch that output electric current is I0 is first connected
Control 21 outputting reference electric current I0 of current source module.
Similarly, as shown in figure 4, by taking five current source branch as an example, electric current included by five different current source branch
Source exports different electric currents respectively, is denoted as I0, I0/2, I0/2 respectively2And I0*2, I0*22, I0 is benchmark electric current, control letter
Number include five level signals, control different current source branch respectively, only one of them level signal is high level signal,
Guarantee that the branch of high level signal control is connected, remaining branch all disconnects, and under default situations, first connecting output electric current is I0's
Current source branch.
Further, with reference to Fig. 3 or Fig. 4, current source regulation module 22 includes first voltage comparator U0, second voltage ratio
Compared with device U1 and logical unit U2, wherein
First voltage comparator U0, for comparing detectable voltage signals VOUT and first threshold signal, the "+" input terminal of U0
First threshold signal is accessed, the "-" input terminal of U0 accesses detectable voltage signals VOUT, when detectable voltage signals are less than first threshold
When signal, the output signal S0 of U0 is high level, when detectable voltage signals are greater than first threshold signal, the output signal S0 of U0
For low level；
Second voltage comparator U1, for comparing detectable voltage signals VOUT and second threshold signal, the "+" input terminal of U1
Detectable voltage signals are accessed, the "-" input terminal of U1 accesses second threshold signal, when detectable voltage signals are greater than second threshold signal
When, the output signal S1 of U1 is high level signal, when detectable voltage signals are less than second threshold signal, the output signal S1 of U1
For low level signal；
Logical unit U2, level signal S0 and second voltage for being exported according to first voltage comparator U0 compare
The level signal S1 of device U1 output generates the control signal including one group of level signal, the varying level letter in the control signal
Number different current source branch is controlled respectively, only one is high level signal, wherein one for connecting a plurality of current source branch
Current source branch.By default, the control signal of logical unit U2 output first connects the electric current that output electric current is I0
Then source branch goes to judge whether switchable current source branch further according to detectable voltage signals VOUT.
In the present embodiment, first threshold signal is 0.2V, and second threshold signal is 1.2V, the two threshold values are according to ADC
The input range of module designs, therefore 0.2V~1.2V is the input range of ADC module.
Temperature sensing circuit provided in an embodiment of the present invention, selected from a plurality of current source branch wherein a branch connect
Logical, the voltage for generating this current source branch on thermistor meets the input range of ADC module, passes through current source branch
Switching, can guarantee within the scope of a very wide temperature, the voltage value on thermistor meets the input of ADC module always
Range solves the problems, such as that temperature detection section is narrow, expanding temperature detection range, (cell phone apparatus can compared with prior art
To accomplish -40 DEG C to 95 DEG C), adjusting current source parameter can make temperature detection range wider.Further, due to by thermistor
On voltage value be limited in a most reasonable range, temperature detecting precision is high.The resolution of temperature detection under program high/low temperature
Rate is all very high (being greater than 8mV), and temperature detecting precision is all very accurate (less than 1.5 DEG C) under high/low temperature.
In addition, the present invention is not only applicable to the detection of mobile communication device temperature, it can also suitably modified technical parameter application
To the temperature detection in other intelligent terminal fields, to realize handset device, intelligent terminal and battery
The temperature detection of wider array of temperature range from low temperature to high temperature range.
The working principle of temperature sensing circuit in above-described embodiment is as shown in Figure 5:
The current source branch that output electric current is I0 is connected under 22 default situations of current source regulation module, when detecting I0 in heat
The detectable voltage signals generated on quick resistance do not need switchable current source branch in [0.2,1.2] interval range；
When detecting detectable voltage signals < 0.2V that I0 is generated on thermistor, current source regulation module 22 is issued
Signal is controlled, controllable current source module 21 is sequentially switched to I0*2, I0*22,I0*23.., until satisfaction > 0.2V；
When detecting the detectable voltage signals > 1.2V generated on I0 thermistor, current source regulation module 22 issues control
Controllable current source module 21 is sequentially switched to I0/2, I0/2 by signal processed2, I0/23..., until satisfaction < 1.2V.
The NTC thermistor that standard resistance value is 10K when specifically, such as 25 DEG C is at -20 DEG C, RNTC=68.23K, if default
Gear I0=40uA, then VNTC=40uA*68.23K=2.7V > 1.2V reduces a gear to 20uA, VNTC=20uA*
68.23K=1.35V > 1.2V, then reduce a gear to 10uA, VNTC=10uA*68.23K=0.682V, in [0.2,1.2] area
Between range, meet the input range of ADC module.And it according to the resistance characteristic of 10KNTC, is used in -30 DEG C to 8 DEG C sections
10uA current source can all meet the interval range requirement, realize the detection of the temperature range.
As can be seen that temperature sensing circuit of the invention can guarantee entire temperature detection by switchable current source branch
In range, detectable voltage signals meet the input range of ADC module always, meet the detection demand of different temperatures, to expand
Temperature detection range.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (7)
1. a kind of temperature sensing circuit characterized by comprising controllable current source module, current source regulation module, thermistor
And ADC module, wherein
The controllable current source module has multiple electric current gears, exports wherein under the control of the current source regulation module
The electric current of one gear；
One end of the thermistor is grounded, and the other end is connect with the output end of the controllable current source module, using it is described can
The electric current for controlling current source module output generates a detectable voltage signals；
The current source regulation module, for exporting control signal according to the detectable voltage signals, the control signal is used for
The electric current that the controllable current source module exports one of gear of multiple electric current gears is controlled, the detectable voltage signals are made
Meet the input range of the ADC module；
The ADC module, when for meeting the input range of the ADC module when the detectable voltage signals, according to the inspection
Survey that voltage signal is counter releases temperature.
2. temperature sensing circuit according to claim 1, which is characterized in that the controllable current source module includes in parallel
A plurality of current source branch, different current source branch are used to export the electric currents of different stalls, current source branch described in each item it is defeated
Enter to be terminated at a bit, form the first common end, first common end connects to power supply, the output of current source branch described in each item
It is terminated at a bit, forms the second common end, second common end is connect with the thermistor.
3. temperature sensing circuit according to claim 2, which is characterized in that with wherein the one of a plurality of current source branch
Current source branch is benchmark branch, and the output electric current of the benchmark branch is benchmark electric current, in remaining each current source branch
A part of branch on the basis of the reference current, successively increase output electric current, another part branch is with the reference current
On the basis of, it is sequentially reduced output electric current.
4. temperature sensing circuit according to claim 2 or 3, which is characterized in that the current source branch includes current source
With N-type metal-oxide-semiconductor, the input terminal of the current source is connect with the power supply, the output end of the current source and the N-type metal-oxide-semiconductor
Drain electrode connection, the grid of the N-type metal-oxide-semiconductor accesses the control signal of current source regulation module output, the N-type MOS
The source electrode of pipe is connect with the thermistor.
5. temperature sensing circuit according to claim 4, which is characterized in that the current source regulation module includes the first electricity
Press comparator, second voltage comparator and logical unit, wherein
The first voltage comparator is used for the detectable voltage signals and first threshold signal, when the detection voltage
When signal is less than the first threshold signal, the first voltage comparator exports high level signal, when the detection voltage is believed
When number being greater than the first threshold signal, the first voltage comparator exports low level signal；
The second voltage comparator is used for the detectable voltage signals and second threshold signal, when the detection voltage
When signal is greater than the second threshold signal, the second voltage comparator exports high level signal, when the detection voltage is believed
When number being less than the second threshold signal, the second voltage comparator exports low level signal, wherein the first threshold is believed
Number be less than the second threshold signal；
The logical unit, level signal and second voltage ratio for being exported according to the first voltage comparator
Compared with the level signal of device output, the control signal including one group of level signal is generated, the control signal is for connecting a plurality of institute
State a wherein current source branch for current source branch.
6. temperature sensing circuit according to claim 5, which is characterized in that
The logical unit is also used to export the control signal including one group of level signal, the control by default
Signal processed is for connecting the benchmark branch.
7. temperature sensing circuit according to claim 1, which is characterized in that the controllable current source module and the electric current
Source adjustment module is integrated in a chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810129269.8A CN110132444B (en) | 2018-02-08 | 2018-02-08 | Temperature detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810129269.8A CN110132444B (en) | 2018-02-08 | 2018-02-08 | Temperature detection circuit |
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| CN110132444A true CN110132444A (en) | 2019-08-16 |
| CN110132444B CN110132444B (en) | 2021-10-26 |
Family
ID=67567663
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| CN201810129269.8A Active CN110132444B (en) | 2018-02-08 | 2018-02-08 | Temperature detection circuit |
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Cited By (3)
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| CN113218527A (en) * | 2021-05-12 | 2021-08-06 | 展讯通信（上海）有限公司 | Thermistor-based temperature detection method, device, equipment, medium and system |
| CN114028657A (en) * | 2021-11-16 | 2022-02-11 | 全鼎电子(苏州)有限公司 | Infusion heating control technology |
| CN114705316A (en) * | 2022-06-06 | 2022-07-05 | 深圳英集芯科技股份有限公司 | Temperature detection circuit, chip and charging device |
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| CN110132444B (en) | 2021-10-26 |
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