CN115993481A - DC metering voltage sampling device of electric energy meter - Google Patents
DC metering voltage sampling device of electric energy meter Download PDFInfo
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- CN115993481A CN115993481A CN202111224224.7A CN202111224224A CN115993481A CN 115993481 A CN115993481 A CN 115993481A CN 202111224224 A CN202111224224 A CN 202111224224A CN 115993481 A CN115993481 A CN 115993481A
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Abstract
The invention discloses a DC metering voltage sampling device of an electric energy meter, which comprises: the device comprises a first voltage division module, an optocoupler processing module, a signal amplifying module, a second voltage division module and a sampling signal switching module which are sequentially connected in series; the input end of the first voltage dividing module is respectively connected with the positive electrode and the negative electrode of the voltage sampling terminal of the electric energy meter to be tested; the optocoupler processing module is used for linearly amplifying and isolating the sampling signal divided by the first voltage dividing module, and the output end of the optocoupler processing module is used for automatically adjusting the reference point of the output voltage according to the connection condition of the positive electrode and the negative electrode of the voltage sampling terminal of the electric energy meter to be measured; the signal amplifying module amplifies the sampling signal output by the optocoupler processing module, and outputs the amplified sampling signal to the sampling signal switching module after passing through the second dividing module; the sampling signal switching module performs differential processing on the single-channel voltage signal output by the second voltage dividing module according to a preset frequency value to obtain differential signals with equal amplitude and inputs the differential signals into the value metering chip voltage channel for metering.
Description
Technical Field
The invention relates to the technical field of intelligent electric meters, in particular to a direct-current metering voltage sampling device of an electric energy meter.
Background
As technology advances, the demand for dc metering is increasing. The current DC electric energy meter is applicable to DC signal equipment electric quantity measuring and electric energy metering devices such as DC charging piles, batteries, photovoltaic power generation and the like, and can also be used for modern DC supply and distribution systems such as industrial and mining enterprises, civil buildings, building automation and the like. Compared with an alternating current metering place, the voltage level of a power supply to be metered in direct current metering is higher, for example, in a direct current charging pile, the rated voltage value of metering is required to be DC700V or DC750V, and the current specification can reach DC300A or even 600A; in a photovoltaic power generation system, the voltage level is as high as DC1000V, and the current specification is about DC 200A. Such high voltage and current specifications require a higher level of safety and fool-proofing in the dc metering system.
In direct current measurement, a current sampling mode is generally adopted to convert a measured current into a corresponding measured current signal by adopting a current divider sampling mode; the voltage sampling generally adopts a resistor voltage division sampling mode, the measured voltage is converted into a corresponding measured voltage signal, the corresponding measured voltage signal is input into a direct current electric energy meter to be directly measured, and a specific circuit form is shown in the following figure 1. In addition, in order to improve the metering accuracy of the direct current electric energy meter in the full temperature range of-40-70 ℃, a direct current signal switching circuit can be adopted to switch the direct current signal into a pulse wave signal of 50Hz, and then a high-pass filter in the metering chip is opened to filter direct current component in the direct current signal. The measure can effectively improve the direct current metering precision, and is widely applied to direct current electric energy meter products, and a specific circuit form is shown in the following figure 1. In this scheme, in the process of wiring the dc electric energy meter, referring to the schematic diagram shown in fig. 2 below, the terminal 2 (corresponding to GND in fig. 1) in the current sampling wiring and the terminal 3 (corresponding to VIN2 in fig. 1) in the current sampling wiring are used as the common terminal (sampling reference point). In the actual wiring, the terminal 1 in fig. 2 is connected to the iin+ in fig. 1, the terminal 2 and the terminal 3 are connected to the GND in fig. 1 as metering public terminals, and the terminal 4 is connected to the VIN1 in fig. 1. The 50Hz signal is a pulse wave signal generated by the MCU inside the electric energy meter.
Along with the wider and wider application places of the direct-current electric energy meter, the direct-current electric energy meter is influenced by the layout of installation positions, the installation positions of the direct-current electric energy meter are different in different places, some manufacturers install direct-current electric energy meter shunt samples (current loop samples) on the positive electrode of the high-voltage power supply to be measured, and some manufacturer direct-current meter shunt samples are installed on the negative electrode of the high-voltage power supply to be measured. Even the sampling installation modes of the DC meter current divider on different types of products of the same manufacturer are different, and the sampling current divider is connected to the positive electrode or the negative electrode of the tested power supply. In the original design scheme, the terminal 2 and the terminal 3 of the direct current electric energy meter are common ends (reference points) of a current sampling loop and a voltage sampling loop, and the terminal 3 is affected by the installation mode of the current sampling loop (the terminal 2) and needs to be correspondingly connected to the positive electrode or the negative electrode of a power supply to be measured, as shown in the following figures 2 and 3.
In the actual batch installation process, the voltage sampling terminal 3 and the current sampling terminal 4 are extremely easy to be reversely connected, the reverse connection can cause the short circuit of the anode and the cathode of the tested power supply, the damage phenomenon of the direct current ammeter occurs, and even the tested power supply is damaged. In view of the above, there is a need to find a voltage sampling scheme that is compatible with both approaches.
Disclosure of Invention
The embodiment of the invention aims to provide a direct-current metering voltage sampling device for an electric energy meter, which allows an input signal of a voltage sampling loop to be a positive signal or a negative signal on the basis of not changing the original overall metering scheme, and avoids the short circuit of the voltage sampling loop and a current sampling loop by utilizing the isolation characteristic of a linear optocoupler so as to be compatible with the two conditions that the current sampling of the direct-current electric energy meter is connected to the positive electrode or the negative electrode of a tested power supply.
In order to solve the above technical problems, an embodiment of the present invention provides a dc metering voltage sampling device for an electric energy meter, including: the device comprises a first voltage division module, an optocoupler processing module, a signal amplifying module, a second voltage division module and a sampling signal switching module which are sequentially connected in series;
the input end of the first voltage dividing module is connected with the positive electrode and the negative electrode of the voltage sampling terminal of the electric energy meter to be measured respectively;
the optocoupler processing module is used for carrying out linear amplification and isolation on the sampling signal divided by the first voltage dividing module, and the output end of the optocoupler processing module is used for automatically adjusting the reference point of the output voltage according to the connection condition of the positive electrode and the negative electrode of the voltage sampling terminal of the electric energy meter to be tested;
the signal amplification module amplifies the sampling signal output by the optocoupler processing module, and outputs the amplified sampling signal to the sampling signal switching module after passing through the second voltage division module;
and the sampling signal switching module performs differential processing on the single-channel voltage signal output by the second voltage dividing module according to a preset frequency value to obtain differential signals with equal amplitude and inputs the differential signals into a value metering chip voltage channel for metering.
Further, the first voltage dividing module includes: the first resistor, the second resistor, the third resistor and the fourth resistor are connected in series;
the first input end and the second input end of the optocoupler processing module are respectively connected with two ends of the fourth resistor.
Further, the input signals of the optocoupler processing module are VIP and VIN respectively, and the output signals of the optocoupler processing module are VOP and VON respectively;
VOP-VON＝n×(VIP-VIN)；
and n is the linear amplification factor of the optocoupler processing module.
Further, the signal amplifying module includes: the operational amplifier, the fifth resistor, the sixth resistor, the seventh resistor, the eighth resistor, the second capacitor and the third capacitor;
the fifth resistor is connected in series with the positive electrode input end of the operational amplifier, the seventh resistor is connected in series with the negative electrode input end of the operational amplifier, the eighth resistor and the third capacitor are connected in parallel and then are respectively connected with the negative electrode input end and the output end of the operational amplifier, and one end of the sixth resistor and one end of the second capacitor are connected in parallel and then are connected with the positive electrode input end of the operational amplifier, and the other end of the sixth resistor and the second capacitor are grounded.
Further, the signal amplifying module further includes: a ninth resistor, a tenth resistor and an adjustable resistor;
the adjustable resistor is connected in series between the positive input end of the operational amplifier and the sixth resistor;
the ninth resistor and the tenth resistor are connected in series and then connected with the adjustable resistor in parallel;
and the connecting end of the ninth resistor and the tenth resistor is also connected with the third end of the adjustable resistor.
Further, the resistance values of the fifth resistor, the sixth resistor, the seventh resistor and the eighth resistor are equal;
the output voltage value of the operational amplifier is as follows:
VO_1＝VOP-VON＝n×(VIP-VIN)；
the VIP and VIN are input signals of the optocoupler processing module, the VOP and VON are output signals of the optocoupler processing module, and n is linear amplification factor of the optocoupler processing module.
Further, the second voltage dividing module includes: an eleventh resistor, a twelfth resistor, and a sixth capacitor;
the eleventh resistor is arranged at the output end of the signal amplifying module in series;
the twelfth resistor is connected with the sixth capacitor in parallel;
one end of the sixth capacitor is connected with the negative electrode of the eleventh resistor, and the other end of the sixth capacitor is grounded.
Further, the relationship between the resistance values of the eleventh resistor and the twelfth resistor is:
the output voltage value of the second voltage dividing module is as follows:
the VIP and VIN are input signals of the optocoupler processing module, the VOP and VON are output signals of the optocoupler processing module, and n is linear amplification factor of the optocoupler processing module.
Further, the preset frequency value is 50Hz.
The technical scheme provided by the embodiment of the invention has the following beneficial technical effects:
on the basis of not changing the original overall metering scheme, the input signal of the voltage sampling loop can be a positive signal or a negative signal, and the short circuit between the voltage sampling loop and the current sampling loop is avoided by utilizing the isolation characteristic of the linear optocoupler so as to be compatible with the two conditions that the current sampling of the direct-current electric energy meter is connected to the positive electrode or the negative electrode of the tested power supply.
Drawings
FIG. 1 is a schematic diagram of a prior art DC voltage sampling circuit and signal processing circuit;
FIG. 2 is a schematic diagram of the prior art connection of terminal 3 and terminal 4 when the shunt sample is connected to the positive electrode of the power supply;
FIG. 3 is a schematic diagram of the prior art connection of terminal 3 and terminal 4 when the shunt sample is connected to the negative pole of the power supply;
fig. 4 is a schematic diagram of a dc metering voltage sampling device of an electric energy meter according to an embodiment of the present invention;
fig. 5 is a schematic diagram two of a dc metering voltage sampling device of an electric energy meter according to an embodiment of the present invention.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
Referring to fig. 4 and 5, an embodiment of the present invention provides a dc metering voltage sampling device of an electric energy meter, including: the device comprises a first voltage division module, an optocoupler processing module, a signal amplifying module, a second voltage division module and a sampling signal switching module which are sequentially connected in series; the input end of the first voltage dividing module is respectively connected with the positive electrode and the negative electrode of the voltage sampling terminal of the electric energy meter to be tested; the optocoupler processing module is used for linearly amplifying and isolating the sampling signal divided by the first voltage dividing module, and the output end of the optocoupler processing module is used for automatically adjusting the reference point of the output voltage according to the connection condition of the positive electrode and the negative electrode of the voltage sampling terminal of the electric energy meter to be measured; the signal amplifying module amplifies the sampling signal output by the optocoupler processing module, and outputs the amplified sampling signal to the sampling signal switching module after passing through the second dividing module; the sampling signal switching module performs differential processing on the single-channel voltage signal output by the second voltage dividing module according to a preset frequency value to obtain differential signals with equal amplitude and inputs the differential signals into the value metering chip voltage channel for metering.
Specifically, the first voltage dividing module includes: a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4 connected in series; the first input end VIP and the second input end VIN of the optocoupler processing module are respectively connected with two ends of the fourth resistor.
Specifically, the input signals of the optocoupler processing module are VIP and VIN respectively, and the output signals of the optocoupler processing module are VOP and VON respectively;
VOP-VON＝n×(VIP-VIN)；
wherein n is the linear magnification of the optocoupler processing module.
Specifically, the signal amplification module includes: the operational amplifier U1, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second capacitor C2 and a third capacitor C3; the fifth resistor R5 is connected in series with the positive input end of the operational amplifier U1, the seventh resistor R7 is connected in series with the negative input end of the operational amplifier U1, the eighth resistor R8 and the third capacitor C3 are connected in parallel and then are respectively connected with the negative input end and the output end of the operational amplifier U1, and one end of the sixth resistor R6 and the second capacitor C2 are connected in parallel and then are connected with the positive input end of the operational amplifier U1, and the other end of the sixth resistor R6 is grounded.
Specifically, the signal amplification module further includes: a ninth resistor R9, a tenth resistor R10, and an adjustable resistor RT1;
the adjustable resistor RT1 is connected in series between the positive input end of the operational amplifier U1 and the sixth resistor R6; the ninth resistor R9 and the tenth resistor R10 are connected in series and then connected with the adjustable resistor RT1 in parallel; the connection end of the ninth resistor R9 and the tenth resistor R10 is also connected with the third end of the adjustable resistor RT 1.
Specifically, the resistance values of the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 are equal; the output voltage value of the operational amplifier U1 is:
VO_1＝VOP-VON＝n×(VIP-VIN)；
the VIP and VIN are input signals of the optocoupler processing module, the VOP and VON are output signals of the optocoupler processing module, and n is linear amplification factor of the optocoupler processing module.
Further, the second voltage dividing module includes: an eleventh resistor R11, a twelfth resistor R12, and a sixth capacitor C6; the eleventh resistor R11 is arranged at the output end of the signal amplifying module in series; the twelfth resistor R12 is connected in parallel with the sixth capacitor C6; one end of the sixth capacitor C6 is connected to the negative electrode of the eleventh resistor R11, and the other end thereof is grounded.
Further, the relationship between the resistance values of the eleventh resistor R11 and the twelfth resistor R12 is:
the output voltage value of the second voltage dividing module is as follows:
the VIP and VIN are input signals of the optocoupler processing module, the VOP and VON are output signals of the optocoupler processing module, and n is linear amplification factor of the optocoupler processing module.
Specifically, in the sampling signal switching module, after the vo_2 voltage passes through a 50Hz signal and a switching circuit built by an MOS transistor, the vo_2 voltage is switched into differential signals (vo+ and VO-) with equal amplitude, and the differential signals are input into a metering chip voltage channel for metering, because the vo_2 voltage value is equal to the sampling signal VIP-VIN value of an original sampling end and is equal to the sampling value in the original scheme, the signal value does not need to be processed in the metering process.
Specifically, if VIN1 and VIN2 are connected with wrong lines in the wiring process, the voltage sampling wiring of the tested power supply is not grounded at the front end of the optocoupler and the current sampling loop, and VOP and VON output at the rear end of the optocoupler automatically adjust the reference point of the output voltage according to the input condition. Therefore, the voltage line is connected reversely, the short circuit of the tested power supply is not caused, and based on the output characteristic of the linear optocoupler, the corresponding relation between VO_2 and VIP and VIN is as follows:
VO_2＝VIN-VIP；
as shown in fig. 5, the difference signals (vo+ and VO-) with constant amplitude obtained by the vo_2 voltage through the switching circuit under the condition are identical to the difference signals (vo+ and VO-) with the same amplitude obtained by normal wiring, the obtained display voltage value is unchanged, and the display voltage negative direction prompt voltage line is reversely connected. Therefore, the self-adaption of the voltage sampling public end is realized, and the situation that the direct-current electric energy meter is connected to the positive electrode or the negative electrode of the tested power supply is compatible.
Further, the preset frequency value is 50Hz.
The embodiment of the invention aims to protect a direct-current metering voltage sampling device of an electric energy meter, which comprises the following components: the device comprises a first voltage division module, an optocoupler processing module, a signal amplifying module, a second voltage division module and a sampling signal switching module which are sequentially connected in series; the input end of the first voltage dividing module is respectively connected with the positive electrode and the negative electrode of the voltage sampling terminal of the electric energy meter to be tested; the optocoupler processing module is used for linearly amplifying and isolating the sampling signal divided by the first voltage dividing module, and the output end of the optocoupler processing module is used for automatically adjusting the reference point of the output voltage according to the connection condition of the positive electrode and the negative electrode of the voltage sampling terminal of the electric energy meter to be measured; the signal amplifying module amplifies the sampling signal output by the optocoupler processing module, and outputs the amplified sampling signal to the sampling signal switching module after passing through the second dividing module; the sampling signal switching module performs differential processing on the single-channel voltage signal output by the second voltage dividing module according to a preset frequency value to obtain differential signals with equal amplitude and inputs the differential signals into the value metering chip voltage channel for metering. The technical scheme has the following effects:
on the basis of not changing the original overall metering scheme, the input signal of the voltage sampling loop can be a positive signal or a negative signal, and the short circuit between the voltage sampling loop and the current sampling loop is avoided by utilizing the isolation characteristic of the linear optocoupler, so that the situation that the current sampling of the direct-current electric energy meter is connected with the positive electrode or the negative electrode of a tested power supply is compatible, the foolproof performance of a product is improved, and the safety of on-site wiring is ensured.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (9)
1. The utility model provides an electric energy meter direct current measurement voltage sampling device which characterized in that includes: the device comprises a first voltage division module, an optocoupler processing module, a signal amplifying module, a second voltage division module and a sampling signal switching module which are sequentially connected in series;
the input end of the first voltage dividing module is connected with the positive electrode and the negative electrode of the voltage sampling terminal of the electric energy meter to be measured respectively;
the optocoupler processing module is used for carrying out linear amplification and isolation on the sampling signal divided by the first voltage dividing module, and the output end of the optocoupler processing module is used for automatically adjusting the reference point of the output voltage according to the connection condition of the positive electrode and the negative electrode of the voltage sampling terminal of the electric energy meter to be tested;
the signal amplification module amplifies the sampling signal output by the optocoupler processing module, and outputs the amplified sampling signal to the sampling signal switching module after passing through the second voltage division module;
and the sampling signal switching module performs differential processing on the single-channel voltage signal output by the second voltage dividing module according to a preset frequency value to obtain differential signals with equal amplitude and inputs the differential signals into a value metering chip voltage channel for metering.
2. The DC metering voltage sampling device of electric energy meter according to claim 1, wherein,
the first voltage dividing module includes: the first resistor, the second resistor, the third resistor and the fourth resistor are connected in series;
the first input end and the second input end of the optocoupler processing module are respectively connected with two ends of the fourth resistor.
3. The DC metering voltage sampling device of electric energy meter according to claim 1, wherein,
the input signals of the optocoupler processing module are VIP and VIN respectively, and the output signals of the optocoupler processing module are VOP and VON respectively;
VOP-VON＝n×(VIP-VIN)；
and n is the linear amplification factor of the optocoupler processing module.
4. The electric energy meter dc metering voltage sampling device of claim 1, wherein the signal amplifying module comprises: the operational amplifier, the fifth resistor, the sixth resistor, the seventh resistor, the eighth resistor, the second capacitor and the third capacitor;
the fifth resistor is connected in series with the positive electrode input end of the operational amplifier, the seventh resistor is connected in series with the negative electrode input end of the operational amplifier, the eighth resistor and the third capacitor are connected in parallel and then are respectively connected with the negative electrode input end and the output end of the operational amplifier, and one end of the sixth resistor and one end of the second capacitor are connected in parallel and then are connected with the positive electrode input end of the operational amplifier, and the other end of the sixth resistor and the second capacitor are grounded.
5. The electrical energy meter dc metering voltage sampling device of claim 4, wherein the signal amplification module further comprises: a ninth resistor, a tenth resistor and an adjustable resistor;
the adjustable resistor is connected in series between the positive input end of the operational amplifier and the sixth resistor;
the ninth resistor and the tenth resistor are connected in series and then connected with the adjustable resistor in parallel;
and the connecting end of the ninth resistor and the tenth resistor is also connected with the third end of the adjustable resistor.
6. The DC metering voltage sampling device of electric energy meter according to claim 4, wherein,
the resistance values of the fifth resistor, the sixth resistor, the seventh resistor and the eighth resistor are equal;
the output voltage value of the operational amplifier is as follows:
VO_1＝VOP-VON＝n×(VIP-VIN)；
the VIP and VIN are input signals of the optocoupler processing module, the VOP and VON are output signals of the optocoupler processing module, and n is linear amplification factor of the optocoupler processing module.
7. The DC metering voltage sampling device of electric energy meter according to claim 1, wherein,
the second voltage dividing module includes: an eleventh resistor, a twelfth resistor, and a sixth capacitor;
the eleventh resistor is arranged at the output end of the signal amplifying module in series;
the twelfth resistor is connected with the sixth capacitor in parallel;
one end of the sixth capacitor is connected with the negative electrode of the eleventh resistor, and the other end of the sixth capacitor is grounded.
8. The DC metering voltage sampling device of electric energy meter according to claim 7, wherein,
the relationship between the resistance values of the eleventh resistor and the twelfth resistor is as follows:
the output voltage value of the second voltage dividing module is as follows:
the VIP and VIN are input signals of the optocoupler processing module, the VOP and VON are output signals of the optocoupler processing module, and n is linear amplification factor of the optocoupler processing module.
9. The DC metering voltage sampling device of electric energy meter according to claim 1, wherein,
the preset frequency value is 50Hz.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111224224.7A CN115993481A (en) | 2021-10-18 | 2021-10-18 | DC metering voltage sampling device of electric energy meter |
| PCT/CN2021/131781 WO2023065452A1 (en) | 2021-10-18 | 2021-11-19 | Direct-current metering voltage sampling device for electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111224224.7A CN115993481A (en) | 2021-10-18 | 2021-10-18 | DC metering voltage sampling device of electric energy meter |
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| CN115993481A true CN115993481A (en) | 2023-04-21 |
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| CN202111224224.7A Pending CN115993481A (en) | 2021-10-18 | 2021-10-18 | DC metering voltage sampling device of electric energy meter |
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| WO (1) | WO2023065452A1 (en) |
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| CN116400130B (en) * | 2023-06-06 | 2023-08-11 | 苏州贝克微电子股份有限公司 | Voltage sampling circuit for outputting current signal |
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| CN105717402B (en) * | 2014-12-03 | 2018-10-09 | 国网辽宁省电力有限公司营口供电公司 | Zero firewire reversal connection automatic identification circuit of electric energy meter and recognition methods |
| US10054631B2 (en) * | 2015-09-21 | 2018-08-21 | Advent Design Corporation | Electrical arcing detector for arcing at series electrictrical connection |
| CN205582255U (en) * | 2016-04-18 | 2016-09-14 | 江苏润圣电气有限公司 | A intelligent adapter for power consumption information acquisition |
| CN205679721U (en) * | 2016-05-30 | 2016-11-09 | 厦门大学嘉庚学院 | The intelligence instrument of the automatic discrimination three-phase three-wire electric energy meter mode of connection |
| CN106991066A (en) * | 2017-02-27 | 2017-07-28 | 北京博纳电气股份有限公司 | Intelligent electric energy meter and its communication AB polarity adaptive communications methods of RS 485 |
| CN107727899A (en) * | 2017-09-25 | 2018-02-23 | 宁波三星医疗电气股份有限公司 | A kind of direct current energy meter |
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