CN101620012B - Temperature detector and use method thereof - Google Patents
Temperature detector and use method thereof Download PDFInfo
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- CN101620012B CN101620012B CN2008101276348A CN200810127634A CN101620012B CN 101620012 B CN101620012 B CN 101620012B CN 2008101276348 A CN2008101276348 A CN 2008101276348A CN 200810127634 A CN200810127634 A CN 200810127634A CN 101620012 B CN101620012 B CN 101620012B
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Abstract
The invention relates to a temperature detector and a use method thereof. The temperature detector of the invention comprises a plurality of comparators, an electronic element and a controller, wherein the comparators are in charge of detecting different temperature zones respectively; the threshold value of the electronic element changes as outside temperature varies, and the output of the electronic element is connected to the comparators; the controller is used for starting one of the comparators within a period of time and generates the other input of the each comparator.
Description
Technical field
The present invention relates to a kind of Temperature Detector and using method thereof, relate in particular to a kind of Temperature Detector and using method thereof of utilizing a plurality of comparers.
Background technology
Most electronic product or element are all very responsive to the variation of operating temperature, and for example digital camera can influence its output performance because of its residing temperature environment; And with regard to IC inside, the change of temperature also can influence operating point and arithmetic speed.So for asking stable performance, most electronic component must be arranged in pairs or groups a Temperature Detector usually with the detection ambient temperature, and carries out the compensation of signal.
Fig. 1 is conventional Temperature Detector.Multiplexer 11 be input as a plurality of electric resistance partial pressures 15, its dividing potential drop can use mode from big to small to arrange.The output Vres of described multiplexer 11 and the output Vdiode of diode 14 be the input end of device 12 as a comparison together.If Vres is greater than Vdiode, so described comparer 12 notification controllers 13 to be reducing the value to the selection signal mux_sel of described multiplexer 11, in order to go out lower Vres in next time selection correspondence.Through after the circulation repeatedly, described controller 13 will obtain the Vres value near Vdiode.And described controller 13 can be learnt the operating temperature that chip is present based on the described final Vres value and the temperature inside table of comparisons.
According to present designer trends, the operating voltage of electronic component is reducing always, therefore can increase the difficulty of comparator design.For example when the opereating specification of Temperature Detector during at-40 ℃ to 120 ℃, the mobility scale of diode voltage is 0.824 to 0.510 volt.And simultaneously, the operating voltage of electronic component is reducing always.For the design of comparer,, whole design difficulty is strengthened in the face of low voltage source and input voltage change on a large scale.
Summary of the invention
The operating voltage of conventional Temperature Detector is reducing always.For the design of comparer,, whole design difficulty is strengthened in the face of low voltage source and input voltage change on a large scale.Temperature Detector of the present invention comprises a plurality of comparers, increases degree of accuracy whereby and reduces the making difficulty.
The Temperature Detector of one embodiment of the invention comprises first multiplexer, electronic component, first comparer, second comparer, second multiplexer and controller.The input end of described first multiplexer is a plurality of electric resistance partial pressures.The threshold voltage of described electronic component can be with temperature change.The input end of described first comparer is connected to the output voltage and described first multiplexer of described electronic component.The input end of described second comparer is connected to the output voltage and described first multiplexer of described electronic component.Described second multiplexer is connected to the output of described first comparer and second comparer.Described controller is connected to the output of described second multiplexer, and it is used to produce the selection signal of described first multiplexer and enables described first comparer or described second comparer.Described first comparer is responsible for detecting different humidity provinces respectively with described second comparer.
The Temperature Detector of another embodiment of the present invention comprises a plurality of comparers, an electronic component and a controller.Described a plurality of comparer is responsible for detecting different humidity provinces respectively.The threshold voltage of described electronic component can be with temperature change, and its output is connected to described a plurality of comparer.Described controller was used for only starting one of described a plurality of comparers in the time, and produced another input of described a plurality of comparers.
The using method of the Temperature Detector of one embodiment of the invention, comprise the following step: start first comparer and second comparer of stopping using, the input end of wherein said first comparer and second comparer all is connected to threshold voltage can be with the electronic component of temperature change, and described first comparer and described second comparer are responsible for detecting different humidity provinces respectively; Utilize a test value to be input to another input end of described first comparer or described second comparer; Utilize the output of described first comparer or second comparer to upgrade described test value, and feed back to described another input end of described first comparer or described second comparer again; And if the described test value value of changing that goes beyond everything, start described second comparer so and described first comparer of stopping using.
Description of drawings
Fig. 1 shows conventional Temperature Detector;
Fig. 2 shows the Temperature Detector of one embodiment of the invention; And
Fig. 3 shows the use flow process of the Temperature Detector of one embodiment of the invention.
Embodiment
Fig. 2 shows the Temperature Detector of one embodiment of the invention.First comparer 21 is used between 120 ℃ to 40 ℃, and its relative input voltage variation is 0.51 volt to 0.67 volt.Second comparer 22 is used between 40 ℃ to-40 ℃, and its relative input voltage variation is 0.67 volt to 0.82 volt.Described first comparer 21 and second comparer 22 can once compare by approximately per 64 μ s, and comparative result is sent to controller 28 via second multiplexer 23.Because described first comparer 21 and second comparer 22 are not to operate always, therefore described controller 28 can utilize the EN signal just to start described first comparer 21 and second comparer 22 when comparison.Open the beginning test value in the described controller 28, for example binary one 110000, represent 88 ℃.When starting, described controller 28 is by described first comparer 21 of SEL_n signal enabling and described second comparer 22 of stopping using, and the described corresponding electric resistance partial pressure Vres that opens selected described first multiplexer 26 of beginning test value, and with the output voltage of the electronic component of temperature change relatively.Described electronic component with temperature change for example uses a diode 25, and its threshold voltage (threshold voltage) can change with temperature, so its output voltage can change with temperature.Described diode 25 is connected to voltage source via current source 24.If described first comparer 21 compares Vres greater than Vdiode, so described controller 28 carried out next samsara with described opening after the beginning, test value successively decreased again.On the contrary, if described first comparer 21 compares Vres less than Vdiode, so described controller 28 carried out next samsara with described opening after the beginning, test value progressively increased again.The described action of progressively increasing or successively decreasing can be carried out via the counter (not shown) in the described controller 28.In the samsara process, described controller 28 also can compare described test value and whether a switching value (for example binary one 101101) equates, the representative of wherein said switching value corresponds to 40 ℃.Finding a described test value and a switching value when described controller 28 equates, described controller 28 just utilizes described second comparer 22 of SEL signal enabling and described first comparer 21 of stopping using, and the comparison of Vres afterwards and Vdiode is just undertaken by described second comparer 22.Present embodiment also can be undertaken by two above comparers, and its purpose is to reduce the input voltage mobility scale of indivedual comparers.Because the input voltage mobility scale of indivedual comparers diminishes, even if therefore operating voltage source diminishes, described first comparer 21 and second comparer 22 still are easy to design.In addition, utilize a plurality of comparers, can make the present invention contain wider temperature range, for example 180 ℃ to-60 ℃ not needing significantly to revise under the situation of control circuit.
Fig. 3 shows the process flow diagram of the changeover voltage adjuster control method of one embodiment of the invention.At step S301, set and open the beginning test value and start first comparer.At step S302, if test value, enters step S304 greater than diode voltage so with the described test value that successively decreases.On the contrary, if test value, enters step S303 less than diode voltage so to increase progressively described test value.Behind step S304, enter step S305; Step S305 compares described test value and whether equals a switching value.If answer is sure, enter step S306 so, start second comparer and first comparer of stopping using.At step S307, if test value, enters step S308 greater than diode voltage so with the described test value that successively decreases.On the contrary, if test value, enters step S309 less than diode voltage so to report described test value.
Above disclosed technology contents of the present invention and technical characterstic, yet the those skilled in the art still may be based on teaching of the present invention and announcement and is made all substitutions and modifications that do not deviate from spirit of the present invention.Therefore, protection scope of the present invention should be not limited to the content that embodiment discloses, and should comprise the various substitutions and modifications of the present invention that do not deviate from, and is contained by appended claims.
Claims (15)
1. Temperature Detector is characterized in that comprising:
First multiplexer, its input end are a plurality of electric resistance partial pressures;
Electronic component, its threshold voltage can be with temperature change;
First comparer, its input end are connected to the output voltage and described first multiplexer of described electronic component;
Second comparer, its input end are connected to the output voltage and described first multiplexer of described electronic component;
Second multiplexer, it is connected to the output of described first comparer and second comparer; And
Controller, the output that it is connected to described second multiplexer is used to produce the selection signal of described first multiplexer and enables described first comparer or described second comparer;
Wherein said first comparer is responsible for detecting different humidity provinces respectively with described second comparer.
2. Temperature Detector according to claim 1 is characterized in that wherein said controller is by enabling described first comparer of signal enabling or described second comparer.
3. Temperature Detector according to claim 1 is characterized in that wherein said first comparer and described second comparer have only one can be activated at one time.
4. Temperature Detector according to claim 1 is characterized in that wherein said electronic component is a diode.
5. Temperature Detector according to claim 1, it is characterized in that wherein said controller includes a counter, described counter is influenced by the output of described second multiplexer, wherein said controller utilizes a switching value and the comparison of described counter, uses described first comparer or described second comparer so as to decision.
6. Temperature Detector according to claim 4 is characterized in that wherein said diode is connected to voltage source via current source.
7. Temperature Detector is characterized in that comprising:
A plurality of comparers, it is responsible for detecting different humidity provinces respectively;
Electronic component, its threshold voltage can be with temperature changes, and its output is as an input of described a plurality of comparers;
And
Controller, it was used for only starting one of described a plurality of comparers in the time, and produced another input of described a plurality of comparers.
8. Temperature Detector according to claim 7 is characterized in that wherein said controller is by enabling one in the described a plurality of comparers of signal enabling.
9. Temperature Detector according to claim 7 is characterized in that wherein said electronic component is a diode.
10. Temperature Detector according to claim 7, it is characterized in that wherein said controller includes a counter, described counter is influenced by the output of described a plurality of comparers, and wherein said controller utilizes a switching value and the comparison of described counter, uses which comparer so as to decision.
11. Temperature Detector according to claim 9 is characterized in that wherein said diode is connected to voltage source via current source.
12. the method for a serviceability temperature detecting device is characterized in that comprising the following step:
Start first comparer and second comparer of stopping using, the input end of wherein said first comparer and second comparer all is connected to threshold voltage can be with the electronic component of temperature change, and described first comparer and described second comparer are responsible for detecting different humidity provinces respectively;
Utilize a test value to be input to another input end of described first comparer or described second comparer;
Utilize the output of described first comparer or second comparer to upgrade described test value, and feed back to described another input end of described first comparer or described second comparer again; And
The value of changing if described test value goes beyond everything starts described second comparer and described first comparer of stopping using so.
13. the method for serviceability temperature detecting device according to claim 12 is characterized in that comprising in addition the following step:
Utilize the output of described first comparer of counter records or described second comparer; And
Utilize the comparison of a switching value and described counter, use described first comparer or described second comparer so as to decision.
14. the method for serviceability temperature detecting device according to claim 12 is characterized in that wherein said first comparer and described second comparer have only one can be activated at one time.
15. the method for serviceability temperature detecting device according to claim 12 is characterized in that comprising in addition by enabling the step of described first comparer of signal enabling or described second comparer.
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| CN2008101276348A CN101620012B (en) | 2008-07-02 | 2008-07-02 | Temperature detector and use method thereof |
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| CN2008101276348A CN101620012B (en) | 2008-07-02 | 2008-07-02 | Temperature detector and use method thereof |
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| CN101620012A CN101620012A (en) | 2010-01-06 |
| CN101620012B true CN101620012B (en) | 2011-04-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6554325B2 (en) * | 2014-08-01 | 2019-07-31 | ローム株式会社 | Insulated synchronous rectification type DC / DC converter and feedback circuit thereof, synchronous rectification controller thereof, power supply device using the same, power supply adapter and electronic device |
| JP6374261B2 (en) | 2014-08-01 | 2018-08-15 | ローム株式会社 | Insulation synchronous rectification type DC / DC converter and synchronous rectification controller thereof, power supply device using the same, power supply adapter, and electronic device |
| CN105444900A (en) * | 2015-11-23 | 2016-03-30 | 苏州莱测检测科技有限公司 | Multipath temperature detection device |
| CN109804230B (en) * | 2017-04-13 | 2021-06-04 | 富士电机株式会社 | Temperature detection device and power conversion device provided with same |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1112675A (en) * | 1994-03-31 | 1995-11-29 | 三洋电机株式会社 | Temperature detecting circuit |
| US5963079A (en) * | 1998-04-10 | 1999-10-05 | National Semiconductor Corporation | Temperature indicator circuit with temperature hysteresis |
| CN1517687A (en) * | 2003-01-14 | 2004-08-04 | ���ǵ�����ʽ���� | Temp. checking circuit unsensing for change of supply voltage and temp |
| CN1856838A (en) * | 2003-09-25 | 2006-11-01 | 英飞凌科技股份公司 | Temperature sensor scheme |
| US7135909B1 (en) * | 2005-05-17 | 2006-11-14 | Sigmatel, Inc. | Temperature sensor circuit and system |
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2008
- 2008-07-02 CN CN2008101276348A patent/CN101620012B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1112675A (en) * | 1994-03-31 | 1995-11-29 | 三洋电机株式会社 | Temperature detecting circuit |
| US5963079A (en) * | 1998-04-10 | 1999-10-05 | National Semiconductor Corporation | Temperature indicator circuit with temperature hysteresis |
| CN1517687A (en) * | 2003-01-14 | 2004-08-04 | ���ǵ�����ʽ���� | Temp. checking circuit unsensing for change of supply voltage and temp |
| CN1856838A (en) * | 2003-09-25 | 2006-11-01 | 英飞凌科技股份公司 | Temperature sensor scheme |
| US7135909B1 (en) * | 2005-05-17 | 2006-11-14 | Sigmatel, Inc. | Temperature sensor circuit and system |
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