CN110333383B - Single-phase alternating-current voltage high-precision rapid detection circuit based on mutual inductor - Google Patents
Single-phase alternating-current voltage high-precision rapid detection circuit based on mutual inductor Download PDFInfo
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- CN110333383B CN110333383B CN201910753691.5A CN201910753691A CN110333383B CN 110333383 B CN110333383 B CN 110333383B CN 201910753691 A CN201910753691 A CN 201910753691A CN 110333383 B CN110333383 B CN 110333383B
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Abstract
The invention belongs to the field of industrial measurement and control, and relates to a single-phase alternating current high-precision rapid detection circuit based on a mutual inductor, which is suitable for various application occasions needing high-precision real-time monitoring and control on an effective value of a single-phase alternating current voltage. The circuit comprises a voltage transformer VS1, an RMS/DC conversion chip IC1, an operational amplifier IC2, a fuse FU1, an upper voltage-dividing resistor R1, a lower voltage-dividing resistor R2, an output filter resistor R3, a positive end resistor R4, a negative end resistor R5, a feedback resistor R6, an input filter capacitor C1, a direct current blocking capacitor C2, a conversion filter capacitor C3, a positive end capacitor C4, a feedback capacitor C5, a power supply capacitor C6 and the like. The circuit consists of a single-phase voltage transformer, an RMS/DC conversion chip, an operational amplifier and the like, and can detect the effective value signal of the single-phase alternating voltage in real time with high precision and wide range. The circuit is simple, low in cost, high in reliability, good in universality and easy to produce.
Description
Technical Field
The invention belongs to the field of industrial measurement and control, relates to a circuit, and particularly relates to a single-phase alternating current high-precision rapid detection circuit based on a mutual inductor, which is suitable for various application occasions needing high-precision real-time monitoring and control of an effective value of a single-phase alternating current voltage.
Background
In all kinds of application systems that adopt single-phase alternating current power supply, all need to detect alternating voltage effective value, the single-phase alternating voltage detection scheme commonly used at present mainly has two categories: one is a scheme based on a single-phase voltage transformer and a diode bridge rectifier filter circuit, which converts a single-phase alternating voltage into an approximate direct-current voltage signal for output; another is a solution based on hall voltage sensors. However, the two current solutions have the following problems: first, the scheme based on single-phase voltage transformer and diode bridge rectifier filter circuit, though simple reliable, nevertheless because diode bridge rectifier circuit has the pressure drop loss, not only there is the nonlinearity of detection and influences the detection precision, has also restricted the voltage detection scope, in addition, also there is great detection hysteresis quality. Secondly, the application range of the scheme based on the Hall voltage sensor is limited due to high price. Therefore, how to design a high-cost-performance effective value detection circuit scheme of alternating voltage, which can realize high-precision and rapid detection based on a single-phase voltage transformer, undoubtedly has a good application prospect, and the invention also provides a starting point of the invention.
Disclosure of Invention
The invention aims to provide a transformer-based single-phase alternating-current voltage high-precision rapid detection circuit aiming at the defects in the prior art. The circuit consists of a single-phase voltage transformer, an RMS/DC conversion chip, an operational amplifier and the like, and can detect the effective value signal of the single-phase alternating voltage in real time with high precision and wide range.
The single-phase alternating current high-precision rapid detection circuit based on the mutual inductor comprises a voltage mutual inductor VS1, an RMS/DC conversion chip IC1, an operational amplifier IC2, a fuse FU1, an upper voltage-dividing resistor R1, a lower voltage-dividing resistor R2, an output filter resistor R3, a positive end resistor R4, a negative end resistor R5, a feedback resistor R6, an input filter capacitor C6, a blocking capacitor C6, a conversion filter capacitor C6, a positive end capacitor C6, a feedback capacitor C6 and a power supply capacitor C6, wherein the first input end AC 6 end of the voltage mutual inductor VS 6 is connected with one end of the fuse FU 6, the other end of the fuse FU 6 is connected with one end ACL 6 of a line to be detected, the second input end AC 6 end of the voltage mutual inductor VS 6 is connected with the other end ACL 6 of the line to be detected, the first output end OUT 6 of the voltage mutual inductor VS 6 is connected with one end of the upper voltage-dividing resistor R6, the other end of the lower voltage-dividing resistor R6 is connected with one end of the, The positive input end IN + end of the RMS/DC conversion chip IC1 is connected, the second output end OUT2 end of the voltage transformer VS1, the other end of the lower divider resistor R2, the other end of the input filter capacitor C1 and one end of the blocking capacitor C2 are all grounded, the other end of the blocking capacitor C2 is connected with the negative input end IN-end of the RMS/DC conversion chip IC1, the positive output end OUT + end of the RMS/DC conversion chip IC1 is connected with one end of the output filter resistor R3 and one end of the conversion filter capacitor C3, the enable end/EN end, the negative source end-V end, the ground end and the negative output end OUT-end of the RMS/DC conversion chip IC1 are all grounded, the positive power end + V end of the RMS/DC conversion chip IC1 is connected with the positive power + V end of the operational amplifier IC2, one end of the power capacitor C6 and the circuit power end VCC, the other end of the output filter resistor R3 is connected with one end of the positive end of the operational amplifier C4, One end of the positive end resistor R4 is connected with the positive input end IN + end of the operational amplifier IC2, the negative input end IN-end of the operational amplifier IC2 is connected with one end of the negative end resistor R5, one end of the feedback resistor R6 and one end of the feedback capacitor C5, the other end of the negative end resistor R5, the other end of the positive end resistor R4, the other end of the positive end capacitor C4 and the other end of the conversion filter capacitor C3 are all grounded, the other end of the feedback resistor R6 and the other end of the feedback capacitor C5 are connected with the output end OUT end of the operational amplifier IC2 and the circuit output end Uout end, and the-V end of the operational amplifier IC2 is grounded.
The invention has the following beneficial effects:
the invention relates to a detection circuit scheme mainly based on an RMS/DC conversion chip, an operational amplifier and the like, which can completely meet the real-time detection requirements of high precision and wide range of single-phase alternating voltage effective values based on a single-phase voltage transformer. The circuit is simple, low in cost, high in reliability, good in universality and easy to produce.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in FIG. 1, the transformer-based single-phase alternating current high-precision rapid detection circuit is provided.
The single-phase alternating current high-precision rapid detection circuit based on the mutual inductor comprises a voltage mutual inductor VS1, an RMS/DC conversion chip IC1, an operational amplifier IC2, a fuse FU1, an upper voltage-dividing resistor R1, a lower voltage-dividing resistor R2, an output filter resistor R3, a positive end resistor R4, a negative end resistor R5, a feedback resistor R6, an input filter capacitor C6, a blocking capacitor C6, a conversion filter capacitor C6, a positive end capacitor C6, a feedback capacitor C6 and a power supply capacitor C6, wherein the AC 6 end of the 1 input end of the voltage mutual inductor VS 6 is connected with one end of the fuse FU 6, the other end of the fuse FU 6 is connected with the ACL 6 end of one end of a line to be detected, the AC 6 end of the 2 input end of the voltage mutual inductor VS 6 is connected with the ACL 6 end of the other end of the line to be detected, the OUT 6 end of the 1 output end of the voltage mutual inductor VS 6 is connected with one end of the upper voltage-dividing resistor R6, and one end of the input capacitor, The positive input end IN + end of the RMS/DC conversion chip IC1 is connected, the 2 nd output end OUT2 end of the voltage transformer VS1, the other end of the lower divider resistor R2, the other end of the input filter capacitor C1 and one end of the blocking capacitor C2 are all grounded, the other end of the blocking capacitor C2 is connected with the negative input end IN-end of the RMS/DC conversion chip IC1, the positive output end OUT + end of the RMS/DC conversion chip IC1 is connected with one end of the output filter resistor R3 and one end of the conversion filter capacitor C3, the enable end/EN end, the negative source end-V end, the ground end and the negative output end OUT-end of the RMS/DC conversion chip IC1 are all grounded, the positive power end + V end of the RMS/DC conversion chip IC1 is connected with the positive power + V end of the operational amplifier IC2, one end of the power capacitor C6 and the circuit power end VCC, the other end of the output filter resistor R3 is connected with one end of the positive end of the operational amplifier C4, One end of the positive end resistor R4 is connected with the positive input end IN + end of the operational amplifier IC2, the negative input end IN-end of the operational amplifier IC2 is connected with one end of the negative end resistor R5, one end of the feedback resistor R6 and one end of the feedback capacitor C5, the other end of the negative end resistor R5, the other end of the positive end resistor R4, the other end of the positive end capacitor C4 and the other end of the conversion filter capacitor C3 are all grounded, the other end of the feedback resistor R6 and the other end of the feedback capacitor C5 are connected with the output end OUT end of the operational amplifier IC2 and the circuit output end Uout end, and the-V end of the operational amplifier IC2 is grounded.
All devices used by the invention, including a voltage transformer VS1, an RMS/DC conversion chip IC1, an operational amplifier IC2 and the like, are all existing mature products and can be obtained through the market. For example: the voltage transformer VS1 adopts JDG series, the RMS/DC chip adopts LTC1968, the operational amplifier adopts TLC4501 and the like.
The main circuit parameters in the invention are matched as follows:
the output signal of the voltage transformer VS1 is u2＝kvux(unit: V),
for the measured single-phase AC voltage (unit: V), UxFor the effective value (unit: V), k, of the measured single-phase AC voltagevIs the nameplate parameter transformation ratio of the voltage transformer VS 1.
R3＝R5 (2)
R4＝R6 (3)
Uoutmax≤Vcc (5)
In the formula1、R2The resistance values (unit: omega) of an upper voltage-dividing resistor R1 and a lower voltage-dividing resistor R2 are shown in the specification3、R4、R5、R6The resistance values (unit: omega) and U of the output filter resistor R3, the positive end resistor R4, the negative end resistor R5 and the feedback resistor R6 are respectivelyxmaxIs the maximum effective value (unit: V), U of the measured voltageout、UoutmaxThe voltage signal output by the circuit of the invention and its maximum value (unit: V), VccThe circuit is supplied with a voltage value (unit: V).
The expression (6) is the relation between the output voltage signal of the circuit and the effective value of the measured voltage.
The working process of the invention is as follows:
in FIG. 1, the voltage transformer VS1 outputs a voltage to be measured
Proportional voltage
The voltage is divided by an upper voltage dividing resistor R1 and a lower voltage dividing resistor R2 to obtain a voltage signal
The output of RMS/DC chip IC1 is u, which is input to RMS/DC chip IC1a(t) effective value
And (unit: V), the effective value signal is filtered and amplified by taking the operational amplifier IC2 as a core, and then a voltage signal which is in direct proportion to the effective value of the measured voltage and is shown in the formula (6) is output. The circuit of the invention avoids diode bridge rectification and power frequency filter circuits, thus realizing the high-precision and rapid detection function of the single-phase alternating voltage effective value based on the single-phase voltage transformer.
Claims (3)
1. A single-phase alternating current high-precision rapid detection circuit based on a transformer is characterized by comprising a voltage transformer VS1, an RMS/DC conversion chip IC1, an operational amplifier IC2, a fuse FU1, an upper voltage-dividing resistor R1, a lower voltage-dividing resistor R2, an output filter resistor R3, a positive end resistor R4, a negative end resistor R5, a feedback resistor R6, an input filter capacitor C1, a blocking capacitor C2, a conversion filter capacitor C3, a positive end capacitor C3, a feedback capacitor C3 and a power supply capacitor C3, wherein the AC 3 end of the 1 input end of the voltage transformer VS 3 is connected with one end of the fuse FU 3, the other end of the fuse FU 3 is connected with the ACL 3 end of a line to be detected, the AC 3 end of the 2 input end of the voltage transformer VS 3 is connected with the VS 3 end of the other end of the line to be detected, the ACL 3 end of the 1 output end of the voltage transformer OUT 3 is connected with one end of the upper voltage-dividing resistor R3, and the other end of the lower, One end of an input filter capacitor C1 is connected with a positive input end IN + end of an RMS/DC conversion chip IC1, a 2 nd output end OUT2 end of a voltage transformer VS1, the other end of a lower divider resistor R2, the other end of the input filter capacitor C1 and one end of a blocking capacitor C2 are all grounded, the other end of the blocking capacitor C2 is connected with a negative input end IN-end of the RMS/DC conversion chip IC1, a positive output end OUT + end of the RMS/DC conversion chip IC1 is connected with one end of an output filter resistor R3 and one end of a conversion filter capacitor C3, an enable end/EN end, a negative source end-V end, a ground end GND end and a negative output end OUT-end of the RMS/DC conversion chip IC1 are all grounded, a positive power source end + V end of the RMS/DC conversion chip IC1 is connected with a positive power source end + V end of an operational amplifier IC2, one end of a power source capacitor C6 and a circuit + VCC end, the other end of the output filter resistor R3 is connected to one end of the positive terminal capacitor C4, one end of the positive terminal resistor R4 and the positive input terminal IN + of the operational amplifier IC2, the negative input terminal IN-terminal of the operational amplifier IC2 is connected to one end of the negative terminal resistor R5, one end of the feedback resistor R6 and one end of the feedback capacitor C5, the other end of the negative terminal resistor R5, the other end of the positive terminal resistor R4, the other end of the positive terminal capacitor C4 and the other end of the conversion filter capacitor C3 are all grounded, the other end of the feedback resistor R6 and the other end of the feedback capacitor C5 are both connected to the output terminal OUT of the operational amplifier IC2 and the circuit output terminal Uout, and the-V terminal of the operational amplifier IC2 is grounded.
2. The transformer-based single-phase alternating-current high-precision rapid detection circuit according to claim 1, characterized in that the circuit parameters are matched as follows:
setting: the output signal of the voltage transformer VS1 is u2＝kvux，
For the single-phase AC voltage to be measured, UxFor the effective value, k, of the measured single-phase AC voltagevThe nameplate parameter transformation ratio of the voltage transformer VS 1;
R3＝R5 (2)
R4＝R6 (3)
Uoutmax≤Vcc (5)
in the formula1、R2The resistance values of the upper voltage-dividing resistor R1 and the lower voltage-dividing resistor R2 are respectively3、R4、R5、R6Respectively as output filterThe resistances of the wave resistor R3, the positive end resistor R4, the negative end resistor R5 and the feedback resistor R6 are UxmaxIs the maximum effective value, U, of the voltage to be measuredout、UoutmaxRespectively the voltage signal output by the circuit and its maximum value, VccSupplying a voltage value to the circuit; the expression (6) is the relation between the output voltage signal of the circuit and the effective value of the measured voltage.
3. The transformer-based single-phase alternating current high-precision rapid detection circuit according to claim 1 or 2, characterized in that a voltage transformer VS1 adopts JDG series, an RMS/DC conversion chip IC1 adopts LTC1968, and an operational amplifier IC2 adopts TLC 4501.
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Effective date of registration: 20220210 Address after: Room 2242, No. 3, Xuanhua Road, Changning District, Shanghai 200050 Patentee after: CHINA ELECTRONIC SYSTEMS TECHNOLOGY Co.,Ltd. Address before: 310018 No. 2 street, Xiasha Higher Education Zone, Hangzhou, Zhejiang Patentee before: HANGZHOU DIANZI University |