CN204119024U - A kind of voltage signal conditioning circuit based on TL431 - Google Patents
A kind of voltage signal conditioning circuit based on TL431 Download PDFInfo
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- CN204119024U CN204119024U CN201420504872.7U CN201420504872U CN204119024U CN 204119024 U CN204119024 U CN 204119024U CN 201420504872 U CN201420504872 U CN 201420504872U CN 204119024 U CN204119024 U CN 204119024U
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Abstract
The utility model discloses a kind of voltage signal conditioning circuit based on TL431, comprise precision voltage regulator chip, operation amplifier chip, filter capacitor, steady resistance, feedback resistance, described close source of stable pressure chip selects TL431 type controllable accurate source of stable pressure, voltage accuracy can reach 0.5%, passage can be nursed one's health for voltage and high-precision voltage reference is provided, as the input voltage of subsequent voltage translation and attenuator circuit, described operation amplifier chip selects LM324 type differential input amplifier amplifier chip, this amplifier can be operated in low to 3V or high under the power supply of 32V by single supply, also can duplicate supply be operated in ± 1.5V ~ ± 16V within the scope of, this voltage signal conditioning circuit structure is simple, with low cost, for the translation of voltage signal and decay conversion provide reliable a reference source, will be input as-10V ~ 10V voltage signal simultaneously and be converted to 0 ~ 3V.
Description
Technical field
The invention belongs to applied power electronics technical field, particularly relate to a kind of voltage signal conditioning circuit based on TL431.
Background technology
The power-supply system of electronic equipment is the basis of whole system, and the steady operation of steady operation to whole data acquisition system of this part plays vital effect, and the quality of power system design directly determines the success or failure of system.Meanwhile, the pollution of power supply often brings various fault to system.Therefore the high power supply of strong interference immunity, reliability is designed concerning very important raising systematic function.System generally need 7 road power supply: D5V(numeral) ,+3.3V ,+7.5 ,-7.5V ,+1.2V, AVCC5V(simulation) ,-5V.System generally adopts+5V DC power supply or USB line to power, and obtains above various magnitude of voltage respectively by buck or boost mode.System each road voltage needs to be obtained through various boosting, reduction voltage circuit by total input voltage, and conventional power-switching circuit can be divided into LDO linear voltage regulator and DC/DC switching regulator two kinds.The output signal normally standard signal of transducer or transmitter, the voltage signal of such as-10V ~ 10V ,-5V ~ 5V and 4 ~ 20mA etc.Therefore need transducer to be exported the voltage signal that analog signals is converted into 0 ~ 3V, just gather by the inner ADC of microcontroller chip.
Summary of the invention
The defect existed for above-mentioned prior art and deficiency, the purpose of this utility model is, a kind of voltage signal conditioning circuit based on TL431 is provided, this circuit construction of electric power of the power circuit that the utility model proposes is simple, with low cost, for the translation of voltage signal and decay conversion provide reliable a reference source, will be input as-10V ~ 10V voltage signal simultaneously and be converted to 0 ~ 3V.
In order to realize above-mentioned task, the present invention adopts following technical solution:
Based on a voltage signal conditioning circuit of TL431, it is characterized in that, comprise precision voltage regulator chip, operation amplifier chip, filter capacitor, steady resistance, feedback resistance, the positive terminal (A) of described precision voltage regulator chip (T) is connected with the reference edge (VREF) of precision voltage regulator chip (T) by the first steady resistance (R1), the negative pole end (K) of precision voltage regulator chip (T) is connected with the reference edge (VREF) of precision voltage regulator chip (T) by the first steady resistance (R2), the negative pole end (K) of precision voltage regulator chip (T) is connected with+5V power supply (Vcc) by the 3rd steady resistance (R3), the negative pole end (K) of precision voltage regulator chip (T) is connected with the inverting input (6) of operation amplifier chip (L) by the 5th steady resistance (R5), described the first filter capacitor (C1) and the second filter capacitor (C2) are connected in parallel between the negative pole end (K) of precision voltage regulator chip (T) and ground, the normal phase input end (5) of described operation amplifier chip (L) is by the 6th steady resistance (R6) ground connection, the output (7) of operation amplifier chip (L) is connected with the inverting input (6) of operation amplifier chip (L) by the 4th feedback resistance (R4), and the output (7) of operation amplifier chip (L) is connected with signal output part (Vnref), described close source of stable pressure chip (T) selects TL431 type controllable accurate source of stable pressure, and described operation amplifier chip (L) selects LM324 type differential input amplifier amplifier chip, described the first filter capacitor (C1) selects 10uF straight cutting alminium electrolytic condenser, and described the second filter capacitor (C2) selects 0.1uF straight cutting alminium electrolytic condenser, described the first steady resistance (R1) selects 5K ohmic semiconductor resistance, described the second steady resistance (R2) selects 1K ohmic semiconductor resistance, the 3rd described steady resistance (R3) selects 500 ohmic semiconductor resistance, and the 4th described feedback resistance (R4), the 5th steady resistance (R5) and the 6th steady resistance (R6) select 10K ohmic semiconductor resistance.
The invention has the beneficial effects as follows:
Data collecting card allows the voltage range-10V ~+10V of input, therefore needs to carry out translation and decay to input signal.In signal condition passage, operational amplifier adopts LM324, LM324 is inner integrated four chips with differential input amplifier amplifier, this amplifier can be operated in low to 3V or high under the power supply of 32V by single supply, also can duplicate supply be operated in ± 1.5V ~ ± 16V within the scope of, dual power supply is adopted in circuit, DC-DC power module MDB12-12D12 is used to provide ± 12V voltage, voltage signal needs a reference source usually when carrying out translation and decay conversion, a reference source choose a reference source and outside reference source that can use built-in chip type, but a reference source driving force that core carries voltage that is smaller and that provide is constant, therefore TL431 is selected to produce voltage-reference, TL431 is controllable accurate source of stable pressure, voltage accuracy can reach 0.5%, passage can be nursed one's health for voltage and high-precision voltage reference is provided, TL431 is used to provide 3V voltage and be converted to-3V in practical application, as the input voltage of subsequent voltage translation and attenuator circuit.
It should be noted that the condition of TL431 regular event is greater than 1mA by the electric current of negative electrode, choosing R3 in circuit is 500 Ω, be now 4mA by the electric current of negative electrode, the function of signal condition passage is converted to 0 ~ 3V by being input as-10V ~ 10V voltage signal, owing to using in-phase adder circuit counting cumbersome, therefore select reverse add circuit, realize the conversion of voltage.
This circuit construction of electric power is simple, with low cost, for the translation of voltage signal provides reliable a reference source with decay conversion, will be input as-10V ~ 10V voltage signal simultaneously and be converted to 0 ~ 3V.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments the utility model is further explained explanation.
Fig. 1 is the structure chart of this voltage signal conditioning circuit.
Embodiment
Fig. 1 is the structure chart of this power circuit, is made up of precision voltage regulator chip, operation amplifier chip, filter capacitor, steady resistance, feedback resistance, the positive terminal (A) of described precision voltage regulator chip (T) is connected with the reference edge (VREF) of precision voltage regulator chip (T) by the first steady resistance (R1), the negative pole end (K) of precision voltage regulator chip (T) is connected with the reference edge (VREF) of precision voltage regulator chip (T) by the first steady resistance (R2), the negative pole end (K) of precision voltage regulator chip (T) is connected with+5V power supply (Vcc) by the 3rd steady resistance (R3), the negative pole end (K) of precision voltage regulator chip (T) is connected with the inverting input (6) of operation amplifier chip (L) by the 5th steady resistance (R5), described the first filter capacitor (C1) and the second filter capacitor (C2) are connected in parallel between the negative pole end (K) of precision voltage regulator chip (T) and ground, the normal phase input end (5) of described operation amplifier chip (L) is by the 6th steady resistance (R6) ground connection, the output (7) of operation amplifier chip (L) is connected with the inverting input (6) of operation amplifier chip (L) by the 4th feedback resistance (R4), and the output (7) of operation amplifier chip (L) is connected with signal output part (Vnref).
Wherein, close source of stable pressure chip (T) selects TL431 type controllable accurate source of stable pressure, and described operation amplifier chip (L) selects LM324 type differential input amplifier amplifier chip; Described the first filter capacitor (C1) selects 10uF straight cutting alminium electrolytic condenser, and described the second filter capacitor (C2) selects 0.1uF straight cutting alminium electrolytic condenser; Described the first steady resistance (R1) selects 5K ohmic semiconductor resistance, described the second steady resistance (R2) selects 1K ohmic semiconductor resistance, the 3rd described steady resistance (R3) selects 500 ohmic semiconductor resistance, and the 4th described feedback resistance (R4), the 5th steady resistance (R5) and the 6th steady resistance (R6) select 10K ohmic semiconductor resistance.
The circuit construction of electric power that the utility model proposes is simple, with low cost, for the translation of voltage signal provides reliable a reference source with decay conversion, will be input as-10V ~ 10V voltage signal simultaneously and be converted to 0 ~ 3V.
Claims (2)
1. based on a voltage signal conditioning circuit of TL431, it is characterized in that, comprise precision voltage regulator chip, operation amplifier chip, filter capacitor, steady resistance, feedback resistance, the positive terminal (A) of described precision voltage regulator chip (T) is connected with the reference edge (VREF) of precision voltage regulator chip (T) by the first steady resistance (R1), the negative pole end (K) of precision voltage regulator chip (T) is connected with the reference edge (VREF) of precision voltage regulator chip (T) by the first steady resistance (R2), the negative pole end (K) of precision voltage regulator chip (T) is connected with+5V power supply (Vcc) by the 3rd steady resistance (R3), the negative pole end (K) of precision voltage regulator chip (T) is connected with the inverting input (6) of operation amplifier chip (L) by the 5th steady resistance (R5), described the first filter capacitor (C1) and the second filter capacitor (C2) are connected in parallel between the negative pole end (K) of precision voltage regulator chip (T) and ground, the normal phase input end (5) of described operation amplifier chip (L) is by the 6th steady resistance (R6) ground connection, the output (7) of operation amplifier chip (L) is connected with the inverting input (6) of operation amplifier chip (L) by the 4th feedback resistance (R4), and the output (7) of operation amplifier chip (L) is connected with signal output part (Vnref).
2. a kind of voltage signal conditioning circuit based on TL431 as claimed in claim 1, it is characterized in that, described close source of stable pressure chip (T) selects TL431 type controllable accurate source of stable pressure, and described operation amplifier chip (L) selects LM324 type differential input amplifier amplifier chip; Described the first filter capacitor (C1) selects 10uF straight cutting alminium electrolytic condenser, and described the second filter capacitor (C2) selects 0.1uF straight cutting alminium electrolytic condenser; Described the first steady resistance (R1) selects 5K ohmic semiconductor resistance, described the second steady resistance (R2) selects 1K ohmic semiconductor resistance, the 3rd described steady resistance (R3) selects 500 ohmic semiconductor resistance, and the 4th described feedback resistance (R4), the 5th steady resistance (R5) and the 6th steady resistance (R6) select 10K ohmic semiconductor resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420504872.7U CN204119024U (en) | 2014-09-03 | 2014-09-03 | A kind of voltage signal conditioning circuit based on TL431 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420504872.7U CN204119024U (en) | 2014-09-03 | 2014-09-03 | A kind of voltage signal conditioning circuit based on TL431 |
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| CN204119024U true CN204119024U (en) | 2015-01-21 |
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| CN201420504872.7U Expired - Fee Related CN204119024U (en) | 2014-09-03 | 2014-09-03 | A kind of voltage signal conditioning circuit based on TL431 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104635830A (en) * | 2015-02-06 | 2015-05-20 | 国家电网公司 | Voltage signal conditioning circuit based on controllable precise voltage regulator |
| CN110138083A (en) * | 2019-05-20 | 2019-08-16 | 哈尔滨研拓科技发展有限公司 | A kind of telemetry circuit and its calibration method of power distribution unit |
| CN113162517A (en) * | 2021-05-08 | 2021-07-23 | 东北大学 | Magnetic suspension motor fault-tolerant control system and method based on self-sensing technology |
-
2014
- 2014-09-03 CN CN201420504872.7U patent/CN204119024U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104635830A (en) * | 2015-02-06 | 2015-05-20 | 国家电网公司 | Voltage signal conditioning circuit based on controllable precise voltage regulator |
| CN110138083A (en) * | 2019-05-20 | 2019-08-16 | 哈尔滨研拓科技发展有限公司 | A kind of telemetry circuit and its calibration method of power distribution unit |
| CN113162517A (en) * | 2021-05-08 | 2021-07-23 | 东北大学 | Magnetic suspension motor fault-tolerant control system and method based on self-sensing technology |
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