CN201964978U - High-precision temperature-digital acquisition circuit - Google Patents
High-precision temperature-digital acquisition circuit Download PDFInfo
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- CN201964978U CN201964978U CN2010206617604U CN201020661760U CN201964978U CN 201964978 U CN201964978 U CN 201964978U CN 2010206617604 U CN2010206617604 U CN 2010206617604U CN 201020661760 U CN201020661760 U CN 201020661760U CN 201964978 U CN201964978 U CN 201964978U
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Abstract
The utility model discloses an Etalon high-precision temperature-digital acquisition circuit which comprises an Etalon optical device, a temperature-voltage converting circuit, an analog-digital converting circuit and a reference voltage source, wherein the reference voltage source is respectively and electrically connected with the Etalon optical device, the temperature-voltage converting circuit and the analog-digital converting circuit, and is used for providing a voltage reference. The Etalon high-precision temperature-digital acquisition circuit solves the problem of inaccurate collected Etalon temperature caused by the temperature drift of the reference voltage source, and has a low cost.
Description
Technical field
The utility model relates to the optical communication field, particularly a kind of Etalon high-precision temperature-digital collection circuit.
Background technology
The Etalon optical device is very important optics in the optical communication equipment.In order to reach certain optical property, must carry out high-precision temperature control to it, the typical temperature accuracy requirement can up to+/-0.01 ℃.And being carried out high-precision temperature acquisition under the varying environment temperature, Etalon also become a difficult point.
Conventional Etalon temperature-digital collection circuit adopts the temperature simulation amount to gather and analog to digital conversion mode fully independently, that is, its reference voltage source that adopts is independently (specifically as shown in Figure 1).Because reference voltage source circuit itself is influenced by ambient temperature very big, so finally the accuracy to temperature acquisition has direct influence.Do to describe in detail below in conjunction with Fig. 2.
As shown in Figure 2, its course of work is:
After powering on, reference voltage source 1 provides a stable reference voltage Vref 1 for Etalon and series connection resistor voltage divider network R2, R3, and reference voltage source 2 provides a stable reference voltage Vref 2 to ADC.
Rt is the thermistor in the Etalon device, and R1 and R4 are 2 build-out resistors.According to amplifier " empty short " principle, the voltage on the amplifier U3A pin two, 3 is 1/2REF.In A node utilization Thevenin theorem (input current equals output current), can get following relational expression:
After 1/2Vref1/R1=(Vref1-1/2Vref1)/Rt+ (Vout-1/2Vref1)/R4 arrangement:
Vout＝1/2*R4*Vref1*(1/R4+1/R1-1/Rt) (1)
At this moment, be the ADC of 12bit as what adopt, then have:
ADC＝4096*Vout/Vref2 (2)
(1) substitution (2) is then had:
ADC＝2048*R4*Vref1/Vref2*(1/R4+1/R1-1/Rt) (3)
Just can find that from (3) if Vref1 and Vref2 change with environment temperature, then the ADC collection capacity will directly be affected.Such as, when temperature variation, Vref1 increases by 1%, and Vref2 reduces 1%, and the ADC collection capacity will increase about 2% so.
Certainly, address the above problem the way of the reference voltage source chip that can also take to use high-temperature stability, but the stable more reference voltage source chip of temperature characterisitic, its price is also expensive more.
Summary of the invention
In order to address the above problem, the utility model provides a kind of Etalon high-precision temperature-digital collection circuit, it adopts supply voltage as the reference voltage source, in order to reference voltage to be provided, avoided floating problem because of the temperature of independent reference voltage source, cause the inaccurate problem of Etalon temperature acquisition, and cost is lower.
To achieve these goals, the utility model provides a kind of high-precision temperature-digital collection circuit, comprise the Etalon optical device, temperature-voltage conversion circuit, analog-to-digital conversion circuit, also comprise a reference voltage source, described reference voltage source is connected with described Etalon optical device, described temperature-voltage conversion circuit and described analog-to-digital conversion circuit respectively, is used to provide voltage reference.
Described reference voltage source directly adopts supply voltage.
Comprise a thermistor Rt in the described Etalon optical device.
Described temperature-voltage conversion circuit comprises a series connection resistor voltage divider network of being made up of resistance R 2 and resistance R 3, one amplifier and a resistance R 1, node between described resistance R 2 and the resistance R 3 links to each other with an input end of described amplifier, be used to provide reference voltage, described resistance R 1 is formed another resistor voltage divider network of connecting with described thermistor Rt, its node links to each other with another input end of described amplifier, be used to provide collection voltage, the output terminal of described amplifier links to each other with described analog-to-digital conversion circuit, is used for the voltage signal after amplifying is flowed to described analog-to-digital conversion circuit.
Advantage of the present utility model is:
(1) avoided floating problem because of the temperature of independent reference voltage source, the temperature acquisition that causes Etalon is problem accurately not.
(2) cost is lower.
Description of drawings
Fig. 1 is the schematic block circuit diagram of prior art.
Fig. 2 is the circuit theory diagrams of prior art.
Fig. 3 is a schematic block circuit diagram of the present utility model.
Fig. 4 is the circuit theory diagrams of the utility model one embodiment.
Embodiment
The utility model is described in further detail below in conjunction with drawings and the specific embodiments.
As shown in Figure 3, high-precision temperature described in the utility model-digital collection circuit is by an Etalon optical device, one reference voltage source, an one temperature-voltage conversion circuit and an analog-to-digital conversion circuit constitute, described reference voltage source respectively with described Etalon optical device, temperature-voltage conversion circuit links to each other with analog to digital conversion circuit, in order to reference voltage to be provided, described Etalon optical device, temperature-voltage conversion circuit, analog-to-digital conversion circuit is connected in series, wherein, described temperature-voltage conversion circuit is used to finish the conversion of temperature-voltage, the amplification of voltage signal, and the voltage signal after will amplifying flows to analog-to-digital conversion circuit.
As Fig. 4, by the Etalon optical device, reference voltage source, resistance R 1-R4, capacitor C 1-C2, amplifier U1A, thermistor Rt, analog-to-digital conversion circuit ADC constitutes.
Wherein, described reference voltage source directly adopts the 3.3V supply voltage, filter capacitor C1 and C2 parallel connection, end ground connection after the parallel connection, the other end respectively with 1 pin of Etalon optical device, an end of resistance R 2 in temperature-voltage conversion circuit, 1 pin of analog-to-digital conversion circuit ADC links to each other.
2 pin of described Etalon optical device link to each other with an end of resistance R 1 in temperature-voltage conversion circuit, and its connected node A links to each other with 2 pin of amplifier U1A and an end of resistance R 4 respectively.Also comprise a thermistor Rt in the described Etalon optical device, the two ends of resistance R t link to each other with 2 pin with 1 pin of Etalon optical device respectively.Resistance R t and R1 constitute the resistor voltage divider network of connecting.
The other end of described resistance R 2 links to each other with resistance R 3 one ends, and its connected node links to each other with 3 pin of amplifier U1A.Resistance R 2 and R3 constitute another series connection resistor voltage divider network.
The other end concurrent ground connection of the other end of described R1 and described R3.
1 pin of described amplifier U1A links to each other with the other end of resistance R 4 and 2 pin of analog-to-digital conversion circuit ADC respectively.
The 3 pin ground connection of described analog-to-digital conversion circuit ADC.
In the foregoing circuit, amplifier U1A is a subtracter, employing be the AD8607ARMZ chip, its 3 pin is "+" input end, input be reference voltage, 2 pin are "-" input end, input be to gather voltage, 1 pin is the output terminal of amplifier U1A.In addition, 1 pin of analog-to-digital conversion circuit ADC is reference voltage input Vref, and 2 pin are for gathering voltage input end AIN.
The principle of work of this temperature-digital collection circuit is as follows:
Supply voltage is as reference voltage, after capacitor C 1, C2 filtering, be provided for Etalon, temperature-voltage conversion circuit and analog-to-digital conversion circuit ADC, comprise a thermistor Rt among the Etalon, resistance R t and R1 constitute the resistor voltage divider network of connecting, and when the Etalon temperature raises, this series connection resistor voltage divider network A node place voltage will change, this voltage is considered as gathering voltage, and is provided for amplifier U1A.Resistance R 2 and R3 constitute another series connection resistor voltage divider network, it will be input to after reference voltage in temperature-voltage conversion circuit carries out voltage division processing, flow to amplifier U1A as reference voltage, amplifier U1A will gather voltage and reference voltage compares, amplify, export to ADC, after ADC finishes the analog digital conversion work of voltage data, voltage is gathered in the amplification of its acquisition compared back output with reference voltage, it relatively exports the result is that the temperature-control circuit that interrelates with this Acquisition Circuit is used.
The concrete course of work of this temperature-digital collection circuit is:
After powering on, reference voltage source provides a stable reference voltage Vcc for Etalon and series connection resistor voltage divider network R2, R3.
Rt is the thermistor in the Etalon device, and R1 and R4 are 2 build-out resistors.According to amplifier " empty short " principle, the voltage on the amplifier U1A pin two, 3 is 1/2REF.In A node utilization Thevenin theorem (input current equals output current), can get following relational expression:
1/2Vcc/R1＝(Vcc-1/2Vcc)/Rt+(Vout-1/2Vcc)/R4
After the arrangement:
Vout＝1/2*R4*Vcc*(1/R4+1/R1-1/Rt) (1)
At this moment, be the ADC of 12bit as what adopt, then have:
ADC＝4096*Vout/Vcc (2)
(1) substitution (2) is then had:
ADC＝2048*R4*(1/R4+1/R1-1/Rt) (3)
Just can find that from (3) collection capacity of ADC will no longer be subjected to the unsettled influence of reference voltage (being Vcc), and Vcc employing 3.3V supply voltage, this voltage temperature variant instability problem can not occur yet.
The above is the utility model most preferred embodiment only, is not to be used to limit scope of the present utility model, and all equivalences of being done according to the utility model claim change or modify, and are all the utility model and contain.
Claims (4)
1. high-precision temperature-digital collection circuit, comprise the Etalon optical device, temperature-voltage conversion circuit, analog-to-digital conversion circuit, it is characterized in that, also comprise a reference voltage source, described reference voltage source is connected with described Etalon optical device, described temperature-voltage conversion circuit and described analog-to-digital conversion circuit respectively, is used to provide voltage reference.
2. high-precision temperature as claimed in claim 1-digital collection circuit is characterized in that described reference voltage source directly adopts supply voltage.
3. high-precision temperature as claimed in claim 1-digital collection circuit is characterized in that, comprises a thermistor Rt in the described Etalon optical device.
4. high-precision temperature as claimed in claim 3-digital collection circuit, it is characterized in that, described temperature-voltage conversion circuit comprises a series connection resistor voltage divider network of being made up of resistance R 2 and resistance R 3, one amplifier and a resistance R 1, node between described resistance R 2 and the resistance R 3 links to each other with an input end of described amplifier, be used to provide reference voltage, described resistance R 1 is formed another resistor voltage divider network of connecting with described thermistor Rt, its node links to each other with another input end of described amplifier, be used to provide collection voltage, the output terminal of described amplifier links to each other with described analog-to-digital conversion circuit, is used for the voltage signal after amplifying is flowed to described analog-to-digital conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206617604U CN201964978U (en) | 2010-12-14 | 2010-12-14 | High-precision temperature-digital acquisition circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206617604U CN201964978U (en) | 2010-12-14 | 2010-12-14 | High-precision temperature-digital acquisition circuit |
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| CN201964978U true CN201964978U (en) | 2011-09-07 |
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| CN2010206617604U Expired - Lifetime CN201964978U (en) | 2010-12-14 | 2010-12-14 | High-precision temperature-digital acquisition circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454006A (en) * | 2012-06-05 | 2013-12-18 | 北大方正集团有限公司 | Temperature monitoring circuit for light-emitting diode |
-
2010
- 2010-12-14 CN CN2010206617604U patent/CN201964978U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454006A (en) * | 2012-06-05 | 2013-12-18 | 北大方正集团有限公司 | Temperature monitoring circuit for light-emitting diode |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110907 |
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| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Wu Junying Document name: Notice of expiration of patent right |