CN204575214U - A kind of maximum temperature sample circuit - Google Patents
A kind of maximum temperature sample circuit Download PDFInfo
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- CN204575214U CN204575214U CN201520208879.9U CN201520208879U CN204575214U CN 204575214 U CN204575214 U CN 204575214U CN 201520208879 U CN201520208879 U CN 201520208879U CN 204575214 U CN204575214 U CN 204575214U
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- operational amplifier
- diode
- thermistor
- maximum temperature
- resistance
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Abstract
The utility model discloses a kind of maximum temperature sample circuit, comprise thermistor, the first operational amplifier, diode and voltage follower, thermistor is at least two, the quantity of the first operational amplifier, diode is identical with the quantity of thermistor respectively, one end access power supply of each thermistor, the other end of each thermistor connects one to one the in-phase input end of the first operational amplifier, and each first operational amplifier connects one to one the positive pole of diode; The negative pole of each diode is connected with the inverting input of each self-corresponding first operational amplifier, and the negative pole of each diode is connected to form the output point of maximum temperature corresponding voltage value, and this output point accesses external microcontroller through voltage follower.The utility model fast, accurately can obtain the maximum temperature in each power device.
Description
Technical field
The utility model relates to sample circuit, is specifically related to a kind of maximum temperature sample circuit.
Background technology
In ups power or inverter system, in order to improve reliability, the temperature of multiple power device that needs to sample, controls to reach the object that cooling system and power device run overheating protection as required.General realization in the following manner:
Mode one, adopt the sampling along separate routes of multiple thermistor, the ADC port being input to single-chip microcomputer is respectively sampled.This defect is, uses the port of single-chip microcomputer more, and affects the travelling speed of single-chip microcomputer.
Mode two: adopt a thermistor to be put into a maximum temperature point on heating radiator.Its defect is, if when heating radiator is comparatively large, power device installs skewness or laod unbalance, the maximum temperature of sampling is also inaccurate.
Utility model content
Technical problem to be solved in the utility model, is just to provide a kind of maximum temperature sample circuit, fast, accurately can obtain the maximum temperature in each power device.
For solving the problems of the technologies described above, the technical scheme that the utility model is taked is as follows:
A kind of maximum temperature sample circuit, comprise thermistor, the first operational amplifier, diode and voltage follower, thermistor is at least two, the quantity of the first operational amplifier, diode is identical with the quantity of thermistor respectively, one end access power supply of each thermistor, the other end of each thermistor connects one to one the in-phase input end of the first operational amplifier, and each first operational amplifier connects one to one the positive pole of diode; The negative pole of each diode is connected with the inverting input of each self-corresponding first operational amplifier, and the negative pole of each diode is connected to form the output point of maximum temperature corresponding voltage value, and this output point accesses external microcontroller through voltage follower.
Preferably, each first operational amplifier correspondence is furnished with the first resistance and electric capacity, and first resistance one end is connected to the in-phase input end of the first operational amplifier, and the other end ground connection of the first resistance, electric capacity is connected to the first resistance.
Preferably, described output point is through one second resistance eutral grounding.
Preferably, described voltage follower is the second operational amplifier, and output point accesses the in-phase input end of the second operational amplifier.
The utility model is compared to the beneficial effect of prior art:
The utility model can detect the Gao mono-tunnel temperature in the sampled point that multiple thermistor is formed accurately, all be input to single-chip microcomputer with the multiple check point of employing to carry out compared with detection, saving the resource of single-chip microcomputer greatly, reducing design cost, and the speed of employing is fast, accuracy rate is high.
Accompanying drawing explanation
Fig. 1 is the connection diagram of the utility model maximum temperature sample circuit.
Embodiment
A kind of maximum temperature sample circuit as shown in Figure 1, comprise thermistor RT1, RT2, RT3, first operational amplifier A, diode D1, D2, D3 and voltage follower, thermistor is at least two, thermistor is set to three by this example, first operational amplifier, the quantity of diode is identical with the quantity of thermistor respectively, each thermistor resistance RT1, RT2, one end access power supply of RT3, each thermistor resistance RT1, RT2, the other end of RT3 connects one to one the in-phase input end of the first operational amplifier A, each first operational amplifier A connects one to one diode D1, D2, the positive pole of D3, the negative pole of each diode D1, D2, D3 is connected with the inverting input of each self-corresponding first operational amplifier A, and the negative pole of each diode D1, D2, D3 is connected to form the output point D of maximum temperature corresponding voltage value, this output point D accesses external microcontroller through voltage follower.
As preferred embodiment, each first operational amplifier A correspondence is furnished with first resistance R1, R2, R3 and electric capacity C1, C2, C3, first resistance R1, R2, R3 one end is connected to the in-phase input end of the first operational amplifier A, the other end ground connection of first resistance R1, R2, R3, electric capacity C1, C2, C3 are connected to first resistance resistance R1, R2, R3.
As preferred embodiment, described output point D through one second resistance R4 ground connection, to form stable measurement point.
As preferred embodiment, described voltage follower is the in-phase input end that the second operational amplifier B, output point D access the second operational amplifier B.
Particularly, this example is provided with three thermistors RT1, RT2, RT3, is NTC negative tempperature coefficient thermistor, is arranged on the inside of each power device or the highest sites of heat generation respectively.Thermistor RT1, RT2, RT3 and the first resistance R1, R2, R3, electric capacity C1, C2, C3 forms resistor voltage divider circuit, be connected with input end in the same way 3 pin of the first operational amplifier A, output terminal 1 pin of the first operational amplifier A and diode D1, D2, the positive pole of D3 connects, negative pole is connected with the reverse input end of the first operational amplifier A, form unidirectional without pressure drop voltage follower circuit, diode D1, D2, the negative pole of D3 and the reverse input end of the first operational amplifier A connect simultaneously together with other several groups of identical circuit in parallel, as the described output point D of maximum temperature check point.
When temperature sampling point 1, temperature sampling point 2, temperature sampling point 3 any point detect that temperature changes, the input end in the same way 3 pin voltage of the first operational amplifier A also can change thereupon, and output terminal 1 pin voltage changes with temperature.When any road output voltage is lower than diode D1, D2, D3 cathode voltage, diode ends, and the reverse input end voltage of the first operational amplifier A, higher than input end in the same way, does not affect output point D and detects magnitude of voltage; When any road output voltage is higher than diode cathode voltage, diode current flow, output point D Voltage Feedback, to the reverse input end of the first operational amplifier A, makes output point D voltage identical with the voltage of in-phase end.The voltage of output point D is exactly magnitude of voltage corresponding to the highest temperature.This voltage signal is through voltage follower i.e. the second operational amplifier B, and the AD sample port being input to external microcontroller is sampled.
Above-described embodiment is only preferred embodiment of the present utility model, is not used for limiting practical range of the present utility model; I.e. all changes of doing according to the utility model content and modification, all by the utility model claim scope required for protection is contained.
Claims (4)
1. a maximum temperature sample circuit, it is characterized in that: comprise thermistor, the first operational amplifier, diode and voltage follower, thermistor is at least two, the quantity of the first operational amplifier, diode is identical with the quantity of thermistor respectively, one end access power supply of each thermistor, the other end of each thermistor connects one to one the in-phase input end of the first operational amplifier, and each first operational amplifier connects one to one the positive pole of diode; The negative pole of each diode is connected with the inverting input of each self-corresponding first operational amplifier, and the negative pole of each diode is connected to form the output point of maximum temperature corresponding voltage value, and this output point accesses external microcontroller through voltage follower.
2. maximum temperature sample circuit according to claim 1, it is characterized in that: each first operational amplifier correspondence is furnished with the first resistance and electric capacity, first resistance one end is connected to the in-phase input end of the first operational amplifier, and the other end ground connection of the first resistance, electric capacity is connected to the first resistance.
3. maximum temperature sample circuit according to claim 1 and 2, is characterized in that: described output point is through one second resistance eutral grounding.
4. maximum temperature sample circuit according to claim 1 and 2, is characterized in that: described voltage follower is the second operational amplifier, and output point accesses the in-phase input end of the second operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520208879.9U CN204575214U (en) | 2015-04-07 | 2015-04-07 | A kind of maximum temperature sample circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520208879.9U CN204575214U (en) | 2015-04-07 | 2015-04-07 | A kind of maximum temperature sample circuit |
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| CN204575214U true CN204575214U (en) | 2015-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520208879.9U Active CN204575214U (en) | 2015-04-07 | 2015-04-07 | A kind of maximum temperature sample circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112698066A (en) * | 2020-12-18 | 2021-04-23 | 贵州航天风华实业有限公司 | Acquisition and measurement circuit for temperature compensation based on thermistor |
-
2015
- 2015-04-07 CN CN201520208879.9U patent/CN204575214U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112698066A (en) * | 2020-12-18 | 2021-04-23 | 贵州航天风华实业有限公司 | Acquisition and measurement circuit for temperature compensation based on thermistor |
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