CN104635830A - Voltage signal conditioning circuit based on controllable precise voltage regulator - Google Patents
Voltage signal conditioning circuit based on controllable precise voltage regulator Download PDFInfo
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- CN104635830A CN104635830A CN201510060966.9A CN201510060966A CN104635830A CN 104635830 A CN104635830 A CN 104635830A CN 201510060966 A CN201510060966 A CN 201510060966A CN 104635830 A CN104635830 A CN 104635830A
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Abstract
The invention discloses a voltage signal conditioning circuit based on a controllable precise voltage regulator. The voltage signal conditioning circuit comprises a precise voltage regulator chip, an operational amplification chip, a filtering capacitor, a stable resistor and a feedback resistor. The TL431 controllable precise voltage regulator is used as the precise voltage regulator chip. The precision of voltage can reach 0.5%. Precise reference voltage can be provided for a high-voltage ideal channel and used as input voltage of following voltage translation and an attenuator circuit. An LM324 type differential input operational amplifier chip is used as the operational amplification chip, an amplifier can work through single power supply at the voltage ranging from 3 V to 32 V, and the amplifier can also work through double power supplies at the voltage ranging from +/-1.5 V to +/-16 V. The voltage signal conditioning circuit is simple in structure and low in cost, provides the reliable reference source for voltage translation and attenuator conversion, and converts the voltage signals ranging from -10 V to 10 V to the voltage signals ranging from 0 V to 3 V.
Description
Technical field
The invention belongs to applied power electronics technical field, particularly a kind of voltage signal conditioning circuit based on controllable accurate source of stable pressure.
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 (DAS) 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 system performance.System generally need 7 road power supply: D5V(numeral) ,+3.3V ,+7.5 ,-7.5V ,+1.2V, AVCC5V(simulation) ,-5V.System generally adopts+5V direct supply or μ SB 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 sensor or transmitter, the voltage signal of such as-10V ~ 10V ,-5V ~ 5V and 4 ~ 20mA etc.Therefore need sensor 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 object of the present invention is to provide a kind of voltage signal conditioning circuit based on controllable accurate source of stable pressure, the present invention propose this circuit construction of electric power of power circuit simple, with low cost, for voltage signal translation and decay conversion reliable reference source is provided ,-10V ~ 10V voltage signal will be input as simultaneously and be converted to 0 ~ 3V.
The technical scheme that the present invention solves the problem is: a kind of voltage signal conditioning circuit based on controllable accurate source of stable pressure, comprises precision voltage regulator chip, operation amplifier chip, filter capacitor, steady resistance, feedback resistance, it is characterized in that, 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 second 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), the normal phase input end (5) of described operation amplifier chip (L) is by the 6th steady resistance (R6) ground connection, the inverting input (6) of operation amplifier chip (L) is connected with the output terminal (7) of operation amplifier chip (L) by the 4th feedback resistance (R4), and the output terminal (7) of operation amplifier chip (L) is connected with signal output part (Vnref), 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, positive terminal (A) ground connection of precision voltage regulator chip (T).
By such scheme, described close source of stable pressure chip (T) is TL431 type controllable accurate source of stable pressure.
By such scheme, described operation amplifier chip (L) is LM324 type differential input amplifier amplifier chip.
By such scheme, a described filter capacitor (C1) is 10 μ F straight cutting alminium electrolytic condensers, and described the second filter capacitor (C2) is 0.1 μ F straight cutting alminium electrolytic condenser.
By such scheme, described first steady resistance (R1) is 5K Ω semiconductor resistor, described second steady resistance (R2) is 1K Ω semiconductor resistor, described 3rd steady resistance (R3) is 500 Ω semiconductor resistors, and described 4th feedback resistance (R4), the 5th steady resistance (R5) and the 6th steady resistance (R6) are 10K Ω semiconductor resistor.
The principle of this circuit working is: 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 dual power 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 reference source usually when carrying out translation and decay conversion, reference source choose the reference source and outside reference source that can use built-in chip type, but the 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 adding circuit, realize the conversion of voltage.
The beneficial effect that the present invention brings is: this circuit construction of electric power is simple, with low cost, for the translation of voltage signal provides reliable reference source with decay conversion, will be input as-10V ~ 10V voltage signal simultaneously and be converted to 0 ~ 3V.
Accompanying drawing explanation
Fig. 1 is the structural representation of the device of one embodiment of the invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, invention is further elaborated.
Fig. 1 is the structural drawing of this power circuit, based on the voltage signal conditioning circuit of controllable accurate source of stable pressure, 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 Vcc by the 3rd steady resistance R3, and 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; Between the negative pole end K that the first described filter capacitor C1 and the second filter capacitor C2 is connected in parallel on 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 terminal 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 terminal 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; The first described filter capacitor C1 selects 10 μ F straight cutting alminium electrolytic condensers, and the second described filter capacitor C2 selects 0.1 μ F straight cutting alminium electrolytic condenser; The first described steady resistance R1 selects 5K Ω semiconductor resistor, the second described steady resistance R2 selects 1K Ω semiconductor resistor, the 3rd described steady resistance R3 selects 500 Ω semiconductor resistors, and the 4th described feedback resistance R4, the 5th steady resistance R5 and the 6th steady resistance R6 select 10K Ω semiconductor resistor.
The circuit construction of electric power that the present invention proposes is simple, with low cost, for the translation of voltage signal provides reliable reference source with decay conversion, will be input as-10V ~ 10V voltage signal simultaneously and be converted to 0 ~ 3V.
Claims (5)
1., based on a voltage signal conditioning circuit for controllable accurate source of stable pressure, comprise precision voltage regulator chip, operation amplifier chip, filter capacitor, steady resistance, feedback resistance, it is characterized in that, 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 second 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), the normal phase input end (5) of described operation amplifier chip (L) is by the 6th steady resistance (R6) ground connection, the inverting input (6) of operation amplifier chip (L) is connected with the output terminal (7) of operation amplifier chip (L) by the 4th feedback resistance (R4), and the output terminal (7) of operation amplifier chip (L) is connected with signal output part (Vnref), 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, positive terminal (A) ground connection of precision voltage regulator chip (T).
2. voltage signal conditioning circuit according to claim 1, is characterized in that, described close source of stable pressure chip (T) is TL431 type controllable accurate source of stable pressure.
3. voltage signal conditioning circuit according to claim 1, is characterized in that, described operation amplifier chip (L) is LM324 type differential input amplifier amplifier chip.
4. voltage signal conditioning circuit according to claim 1, is characterized in that, a described filter capacitor (C1) is 10 μ F straight cutting alminium electrolytic condensers, and described the second filter capacitor (C2) is 0.1 μ F straight cutting alminium electrolytic condenser.
5. voltage signal conditioning circuit according to claim 1, it is characterized in that, described first steady resistance (R1) is 5K Ω semiconductor resistor, described second steady resistance (R2) is 1K Ω semiconductor resistor, described 3rd steady resistance (R3) is 500 Ω semiconductor resistors, and described 4th feedback resistance (R4), the 5th steady resistance (R5) and the 6th steady resistance (R6) are 10K Ω semiconductor resistor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510060966.9A CN104635830A (en) | 2015-02-06 | 2015-02-06 | Voltage signal conditioning circuit based on controllable precise voltage regulator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510060966.9A CN104635830A (en) | 2015-02-06 | 2015-02-06 | Voltage signal conditioning circuit based on controllable precise voltage regulator |
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| CN104635830A true CN104635830A (en) | 2015-05-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106155158A (en) * | 2016-07-14 | 2016-11-23 | 成都市思卡利科技有限公司 | A kind of mu balanced circuit based on the design of controllable accurate source of stable pressure |
| CN108181491A (en) * | 2018-01-03 | 2018-06-19 | 江苏林洋能源股份有限公司 | A kind of method for improving electric energy meter measuring accuracy and measuring reliability |
| CN111679711A (en) * | 2020-06-28 | 2020-09-18 | 中国兵器工业集团第二一四研究所苏州研发中心 | Hybrid integrated circuit of ultra-precise reference voltage |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204119024U (en) * | 2014-09-03 | 2015-01-21 | 徐云鹏 | A kind of voltage signal conditioning circuit based on TL431 |
| CN204117011U (en) * | 2014-09-05 | 2015-01-21 | 徐云鹏 | A kind of voltage signal conditioning circuit based on controllable accurate source of stable pressure |
| CN204462920U (en) * | 2015-02-06 | 2015-07-08 | 国家电网公司 | Based on the voltage signal conditioning circuit of controllable accurate source of stable pressure |
-
2015
- 2015-02-06 CN CN201510060966.9A patent/CN104635830A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204119024U (en) * | 2014-09-03 | 2015-01-21 | 徐云鹏 | A kind of voltage signal conditioning circuit based on TL431 |
| CN204117011U (en) * | 2014-09-05 | 2015-01-21 | 徐云鹏 | A kind of voltage signal conditioning circuit based on controllable accurate source of stable pressure |
| CN204462920U (en) * | 2015-02-06 | 2015-07-08 | 国家电网公司 | Based on the voltage signal conditioning circuit of controllable accurate source of stable pressure |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106155158A (en) * | 2016-07-14 | 2016-11-23 | 成都市思卡利科技有限公司 | A kind of mu balanced circuit based on the design of controllable accurate source of stable pressure |
| CN108181491A (en) * | 2018-01-03 | 2018-06-19 | 江苏林洋能源股份有限公司 | A kind of method for improving electric energy meter measuring accuracy and measuring reliability |
| CN111679711A (en) * | 2020-06-28 | 2020-09-18 | 中国兵器工业集团第二一四研究所苏州研发中心 | Hybrid integrated circuit of ultra-precise reference voltage |
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Application publication date: 20150520 |