CN113009213A - Voltage transmitter - Google Patents
Voltage transmitter Download PDFInfo
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- CN113009213A CN113009213A CN202110144295.XA CN202110144295A CN113009213A CN 113009213 A CN113009213 A CN 113009213A CN 202110144295 A CN202110144295 A CN 202110144295A CN 113009213 A CN113009213 A CN 113009213A
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- 238000002955 isolation Methods 0.000 claims abstract description 18
- 239000011324 bead Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims 1
- 239000003990 capacitor Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 101100274419 Arabidopsis thaliana CID5 gene Proteins 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
The invention discloses a voltage transmitter, which comprises a voltage input module, a voltage compensation module, a DC/DC isolation power supply, an optical coupler and a first operational amplifier, the output end of the voltage input module is connected with the input end of the voltage compensation module, the output end of the voltage compensation module is connected with the input end of the optical coupler, the output end of the optical coupler is connected with the input end of the first operational amplifier, the power supply end of the input end of the DC/DC isolation power supply is used as the power supply end of the output end of the optical coupler, the output end of the optical coupler is connected with the grounding end of the input end of the DC/DC isolation power supply, the input voltage is subjected to voltage compensation through the voltage compensation module, high-precision optical couplers are adopted to prevent high voltage from damaging equipment, and an operational amplifier is adopted to perform offset compensation, gain compensation, zero calibration and the like on the output voltage, so that higher voltage precision is achieved.
Description
Technical Field
The invention relates to the field of charging piles, in particular to a high-precision voltage transmitter.
Background
In life, a lot of industrial equipment can be seen, as long as industrial equipment exists, parameters such as voltage and the like need to be known, a new energy charging pile is taken as an example and is used for charging a new energy automobile, most of existing new energy automobiles are mainly energy storage with lithium batteries, but the lithium batteries have extremely strict voltage requirements, the new energy automobiles need to have the voltage within a range of 10V with the required voltage, and the output voltage is usually 750V. But often this is much more critical than in practice, since 10V is the maximum upper limit value, and there can be practically no 1V variation between the detected voltage and the actual voltage, which is obviously impossible, since the 1V variation is 0.133% for 750V, and this high accuracy is not achievable by the prior art in situations where the industrial disturbances are so large.
Disclosure of Invention
In view of the above technical problems, the present invention provides a voltage transmitter capable of outputting a dc voltage signal with high accuracy and high reliability at low cost.
The embodiment of the invention provides a voltage transmitter which comprises a voltage input module, a voltage compensation module, a DC/DC isolation power supply, an optical coupler and a first operational amplifier, wherein the output end of the voltage input module is connected with the input end of the voltage compensation module, the output end of the voltage compensation module is connected with the input end of the optical coupler, the output end of the optical coupler is connected with the input end of the first operational amplifier, the power supply end of the input end of the DC/DC isolation power supply is used as the power supply end of the output end of the optical coupler, and the output end of the optical coupler is connected with the grounding end of the input end of the DC/DC isolation power supply.
Optionally, the voltage compensation module includes a voltage reduction circuit and a filter circuit connected to each other, an input end of the voltage reduction circuit is connected to the voltage input module, and an input signal of the voltage input module is subjected to voltage reduction processing by the voltage reduction circuit and is input to an input end of the voltage compensation module after being subjected to filter processing by the filter circuit.
Optionally, the voltage compensation module includes a second operational amplifier and a TL431 chip, and a non-inverting input end and an output end of the second operational amplifier are both connected to an output end of the optocoupler.
Optionally, the output terminal of the TL431 chip is connected to a first terminal of the current limiting resistor, and a second terminal of the current limiting resistor is connected to the output terminal of the second operational amplifier through a resistor.
Optionally, the optical coupler is an HCNR200 optical coupler.
Optionally, the output end of the HCNR200 optical coupler is connected to the non-inverting input end and the inverting input end of the first operational amplifier, respectively.
Optionally, the first operational amplifier is an inverse multiple adder.
Optionally, the voltage input module further comprises a fuse and an anti-reverse module.
Optionally, the voltage input module further comprises a magnetic bead for preventing EMI interference.
In the technical scheme provided by the embodiment of the invention, the voltage transmitter comprises a voltage input module, a voltage compensation module, a DC/DC isolation power supply, an optical coupler and a first operational amplifier, wherein the output end of the voltage input module is connected with the input end of the voltage compensation module, the output end of the voltage compensation module is connected with the input end of the optical coupler, the output end of the optical coupler is connected with the input end of the first operational amplifier, the power supply end of the input end of the DC/DC isolation power supply is used as the power supply end of the output end of the optical coupler, and the output end of the optical coupler is connected with the grounding end of the input end of the DC/DC isolation power supply. So that a higher voltage accuracy is achieved.
Drawings
FIG. 1 is a schematic circuit diagram of a voltage transmitter according to the present invention;
FIG. 2 is a schematic circuit diagram of a voltage compensation module of a voltage transmitter according to the present invention;
FIG. 3 is a graph of IPD1 output for an optocoupler of a voltage transmitter of the invention;
FIG. 4 is a schematic circuit diagram of a TL431 chip of a voltage transmitter of the present invention;
FIG. 5 is a schematic circuit diagram of U6A of the first operational amplifier of the voltage transformer of the present invention;
FIG. 6 is a circuit diagram of U6B of the first operational amplifier of the voltage transformer according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The voltage transducer is a device which converts the measured AC voltage, DC voltage and pulse voltage into the output DC voltage or DC current according to the linear proportion and isolates and outputs the analog signal or digital signal. The conventional voltage transmitter can realize the measurement of high-voltage (500-1000V), but the accuracy is not high enough, and the invention provides the high-precision voltage transmitter, which can achieve the accuracy of 0.1%.
The invention provides a voltage transmitter which comprises a voltage input module, a voltage compensation module, a DC/DC isolation power supply, an optical coupler and a first operational amplifier, wherein the output end of the voltage input module is connected with the input end of the voltage compensation module, the output end of the voltage compensation module is connected with the input end of the optical coupler, the output end of the optical coupler is connected with the input end of the first operational amplifier, the power supply end of the input end of the DC/DC isolation power supply is used as the power supply end of the output end of the optical coupler, and the output end of the optical coupler is connected with the grounding end of the input end of the DC/DC isolation power supply.
Referring to fig. 1, the voltage transmitter includes a voltage input module 10, a voltage compensation module 20, a DC/DC isolation power supply, an optical coupler 30 and a first operational amplifier 40, an output terminal of the voltage input module 10 is connected to an input terminal of the voltage compensation module 20, an output terminal of the voltage compensation module 20 is connected to an input terminal of the optical coupler 30, an output terminal of the optical coupler 30 is connected to an input terminal of the first operational amplifier 40, a power supply terminal of the input terminal of the DC/DC isolation power supply is used as a power supply terminal of an output terminal of the optical coupler 30, and an output terminal of the optical coupler 30 is connected to a ground terminal of the.
The voltage compensation module of the invention performs voltage compensation on the input voltage, adopts a high-precision optical coupler to prevent high voltage from damaging equipment, and adopts an operational amplifier to perform offset compensation, gain compensation, zero calibration and the like on the output voltage, so that higher voltage precision is achieved.
In one embodiment of the present invention, please refer to fig. 2, the voltage compensation module includes a voltage reduction circuit and a filter circuit connected to each other, an input end of the voltage reduction circuit is connected to the voltage input module, and an input signal of the voltage input module is subjected to voltage reduction processing by the voltage reduction circuit and is input to an input end of the voltage compensation module after being subjected to filter processing by the filter circuit. The voltage input module inputs voltage in the range of 0-1000V, the voltage is reduced to 1-5V after being processed by the voltage compensation module and the DC/DC isolation power supply, and the voltage is amplified by a preset multiple through the first operational amplifier to improve the output driving capability.
The voltage compensation module comprises a second operational amplifier U5 and a TL431 chip U10, the second operational amplifier U5 adopts a TP2604 chip, the second operational amplifier U5 comprises U5A and U5B, the output end of U5B is respectively connected with the first ends of a resistor R31 and a resistor R32, the second ends of a resistor R31 and a resistor R32 are respectively connected with the first ends of a resistor R34, a resistor R35 and a U5B, the inverting input end of U5B is respectively connected with the first ends of a resistor R40 and a capacitor C30, the second ends of a resistor R40 and a capacitor C30 are respectively connected with the first ends of a resistor R31 and a resistor R32, the inverting input end of U5A is connected with the first end of a capacitor C25, the homodromous input end of U5A is connected with a capacitor C27, a resistor R34, the second end of a resistor R35 is respectively connected with the first end of a resistor R38, the first end of R39, the first end of a resistor R38 is connected with the second end of the capacitor C38, the second end of the output end of the, the second terminal of the capacitor C31 is connected to the input terminal of the TL431 chip, and the unidirectional input terminal of U5A is connected to the input terminal of the TL431 chip U10 through a resistor R43.
In the above embodiment, the optical coupler is an HCNR200 optical coupler. Referring to fig. 3, which is a graph of IPD1 output of optocoupler, according to fig. 3, at zero point, there is a very small non-linear curve, at which time, a zero point non-linear region of HCNR200 can be calibrated by inputting a current of more than 5uA through TL 431.
Referring to fig. 4, the resistor R21 is a current limiting resistor, and the output terminal of the TL431 chip is connected to the first terminal of the current limiting resistor R21. The current limiting resistor R21 has a resistance of 390K.
The first operational amplifier U6 of the present invention includes U6A and U6B, the output terminal of the optocoupler HCNR200 is connected to the non-inverting input terminal and the inverting input terminal of U6A, respectively, and the output terminal of U6A is connected to the inverting input terminal of U6B, as shown in fig. 5. The TL431 output of 2.5V is divided by a resistor R21 of 390K to calculate the current to be 6.4uA, and then the current is input into a photoelectric coupler HCNR2000 and amplified by 100 times through U6A, and the output voltage is 0.6410V.
Referring to fig. 6, which is a circuit diagram of U6B, U6B is an inverse multiple adder, the non-inverting input terminal of U6B is connected to the first terminal of the resistor R20, and the other terminal of the resistor R20 is grounded. The inverting input end of the U6B is connected with the first ends of the resistor R11, the resistor R15, the sliding rheostat R13 and the capacitor C17 respectively, the second end of the sliding rheostat R13 is connected with the first end of the resistor R9, the second end of the resistor R9 and the second end of the capacitor C17 are connected with the output end of the U6B, the second end of the resistor R15 is connected with the sliding rheostat R14, the first end of the sliding rheostat R14 is connected with the output end of the TL431, and the input end of the TL431 is grounded. The second end of the slide rheostat R14 is connected with the first end of the resistor R19, and the second end of the resistor R19 is grounded. The slide rheostat R13 is used for adjusting amplitude, and the resistor R19 is used for adjusting zero point.
In the above embodiment, since the preceding stage has an output of 6.4uA, resulting in subsequent amplification, and an output of 1.27V is obtained after gain, in this case, TL431 is used as zero point compensation in the figure, and is divided by sliding rheostat R14 and resistor R19, and then amplified by transimpedance, an output of 0.27V is obtained, at this time, the preceding stage voltage of 0.27V is cancelled, resulting in a zero point state of 1V. In the figure, the gain can be adjusted by adjusting the slide rheostat R13, and the zero point can be adjusted by adjusting the slide rheostat R14.
In one embodiment of the present invention, the voltage input module 10 further includes a fuse and an anti-reverse module. The voltage input module 10 further includes magnetic beads for preventing EMI interference.
According to the invention, voltage offset compensation is carried out through the voltage compensation module, voltage zero calibration is carried out through the TL431 chip, and meanwhile, a series of precision calibrations such as high-precision resistance temperature drift compensation and voltage reverse detection are adopted, so that the detection precision is greatly improved.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. The voltage transmitter is characterized by comprising a voltage input module, a voltage compensation module, a DC/DC isolation power supply, an optical coupler and a first operational amplifier, wherein the output end of the voltage input module is connected with the input end of the voltage compensation module, the output end of the voltage compensation module is connected with the input end of the optical coupler, the output end of the optical coupler is connected with the input end of the first operational amplifier, the power supply end of the input end of the DC/DC isolation power supply is used as the power supply end of the output end of the optical coupler, and the output end of the optical coupler is connected with the grounding end of the input end of the DC/DC isolation power supply.
2. The voltage transmitter of claim 1, wherein the voltage compensation module comprises a voltage reduction circuit and a filter circuit connected to each other, an input terminal of the voltage reduction circuit is connected to the voltage input module, and an input signal of the voltage input module is input to the input terminal of the voltage compensation module after being subjected to voltage reduction processing by the voltage reduction circuit and filtering processing by the filter circuit.
3. The voltage transmitter of claim 1, wherein the voltage compensation module comprises a second operational amplifier and a TL431 chip, and a non-inverting input terminal and an output terminal of the second operational amplifier are both connected with an output terminal of the optical coupler.
4. The voltage transmitter of claim 3, further comprising a current limiting resistor, wherein the output terminal of the TL431 chip is connected to a first terminal of the current limiting resistor, and a second terminal of the current limiting resistor is connected to the output terminal of the second operational amplifier through a resistor.
5. A voltage transducer as claimed in claim 1, characterized in that the optical coupler is an HCNR200 optical coupler.
6. The voltage transmitter of claim 5 wherein the output of the HCNR200 optical coupler is connected to the non-inverting input and the inverting input of the first operational amplifier, respectively.
7. A voltage transducer as claimed in claim 1, characterized in that the first operational amplifier is an inverse multiple adder.
8. A voltage transducer as claimed in claim 1, characterized in that the voltage input module further comprises a fuse and an anti-reverse module.
9. The voltage transmitter of claim 1, wherein the voltage input module further comprises magnetic beads for preventing EMI interference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110144295.XA CN113009213A (en) | 2021-02-02 | 2021-02-02 | Voltage transmitter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110144295.XA CN113009213A (en) | 2021-02-02 | 2021-02-02 | Voltage transmitter |
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| CN113009213A true CN113009213A (en) | 2021-06-22 |
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| CN202110144295.XA Pending CN113009213A (en) | 2021-02-02 | 2021-02-02 | Voltage transmitter |
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| US20120268021A1 (en) * | 2011-04-20 | 2012-10-25 | Chicony Power Technology Co., Ltd. | Multi-channel led driving system |
| CN104242609A (en) * | 2014-09-18 | 2014-12-24 | 江苏大学 | Disturbance rejection device of buck circuit |
| CN104348194A (en) * | 2013-07-26 | 2015-02-11 | 无锡华润矽科微电子有限公司 | Electric vehicle charging control circuit and calibration method thereof |
| CN205356747U (en) * | 2016-01-21 | 2016-06-29 | 珠海金晟照明科技有限公司 | A control circuit for constant voltage power supply |
| CN206818782U (en) * | 2017-06-08 | 2017-12-29 | 广东志高暖通设备股份有限公司 | A kind of voltage detecting circuit and air-conditioning system with buffer action |
| CN207010652U (en) * | 2017-05-26 | 2018-02-13 | 深圳市顺源科技有限公司 | A kind of PWM pulse width signals DA changes miniature isolating transmitter |
| CN207601291U (en) * | 2017-12-19 | 2018-07-10 | 广东雅达电子股份有限公司 | A kind of DC voltage transmitter calibrated using digital form |
| CN209764212U (en) * | 2019-06-28 | 2019-12-10 | 苏州迅鹏仪器仪表有限公司 | Weighing signal isolation transmitter |
| CN210839043U (en) * | 2019-11-25 | 2020-06-23 | 湖北嘉辰达新能源科技有限公司 | Low-voltage large-current type electric forklift charger |
-
2021
- 2021-02-02 CN CN202110144295.XA patent/CN113009213A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6236582B1 (en) * | 2000-02-01 | 2001-05-22 | Micro Linear Corporation | Load share controller for balancing current between multiple supply modules |
| CN101860058A (en) * | 2010-05-25 | 2010-10-13 | 安徽浩淼光电科技有限公司 | Wind and solar energy mutual compensating power tracking controller based on feedback compensation |
| US20120268021A1 (en) * | 2011-04-20 | 2012-10-25 | Chicony Power Technology Co., Ltd. | Multi-channel led driving system |
| CN104348194A (en) * | 2013-07-26 | 2015-02-11 | 无锡华润矽科微电子有限公司 | Electric vehicle charging control circuit and calibration method thereof |
| CN104242609A (en) * | 2014-09-18 | 2014-12-24 | 江苏大学 | Disturbance rejection device of buck circuit |
| CN205356747U (en) * | 2016-01-21 | 2016-06-29 | 珠海金晟照明科技有限公司 | A control circuit for constant voltage power supply |
| CN207010652U (en) * | 2017-05-26 | 2018-02-13 | 深圳市顺源科技有限公司 | A kind of PWM pulse width signals DA changes miniature isolating transmitter |
| CN206818782U (en) * | 2017-06-08 | 2017-12-29 | 广东志高暖通设备股份有限公司 | A kind of voltage detecting circuit and air-conditioning system with buffer action |
| CN207601291U (en) * | 2017-12-19 | 2018-07-10 | 广东雅达电子股份有限公司 | A kind of DC voltage transmitter calibrated using digital form |
| CN209764212U (en) * | 2019-06-28 | 2019-12-10 | 苏州迅鹏仪器仪表有限公司 | Weighing signal isolation transmitter |
| CN210839043U (en) * | 2019-11-25 | 2020-06-23 | 湖北嘉辰达新能源科技有限公司 | Low-voltage large-current type electric forklift charger |
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