CN108254600B - Electric energy meter - Google Patents

Electric energy meter Download PDF

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Publication number
CN108254600B
CN108254600B CN201810154790.7A CN201810154790A CN108254600B CN 108254600 B CN108254600 B CN 108254600B CN 201810154790 A CN201810154790 A CN 201810154790A CN 108254600 B CN108254600 B CN 108254600B
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electrically connected
shunt
electric energy
energy meter
metering chip
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CN108254600A (en
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沈镇炜
周旋
朱朦
朱蓬辉
滕世玉
朱海双
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Nanjing Feat Electronic Technology Co ltd
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Nanjing Feat Electronic Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
    • G01R11/02—Constructional details

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  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

The invention discloses an electric energy meter, and belongs to the technical field of electric energy meters. The electric energy meter includes: measurement chip, shunt, piezo-resistor, wherein: the first welding spot of the current divider is electrically connected with the grounding pin of the metering chip, and the grounding pin of the metering chip is grounded; the shunt is electrically connected with the first end of the piezoresistor, and the second end of the piezoresistor is electrically connected with the zero line end; the problem that the large current discharged from the piezoresistor has inevitable interference on a metering chip circuit in the related technology is solved, and the effect of ensuring the normal operation of the electric energy meter is achieved.

Description

Electric energy meter
Technical Field
The invention relates to the technical field of electric energy meters, in particular to an electric energy meter.
Background
An electric energy meter is a meter for measuring electric energy, and is usually connected with an electric power supply system during use. In order to avoid the problem that the electric energy meter is damaged due to the fact that an excessively high instantaneous voltage (for example, upper kilovolt) provided by an electric power supply system is loaded to a wire inlet end of the electric energy meter, a piezoresistor is usually arranged in the electric energy meter, one end of the piezoresistor is connected to the wire inlet end through a cable, and the other end of the piezoresistor is grounded. When high voltage is loaded to the wire inlet end of the electric energy meter, the resistance of the piezoresistor is reduced, so that current is shunted, and sensitive electronic components in the electric energy meter are protected.
However, the end of the piezoresistor connected with the incoming line end is also electrically connected with the grounding pin of the metering chip, so that the large current discharged from the piezoresistor has inevitable interference on the circuit of the metering chip. When the interference is weak, the metering chip works abnormally, such as the problems of generating induced current, power and the like; when the interference is serious, if the disturbance voltage loaded on the metering chip exceeds the maximum withstand voltage that the pins can bear, the metering chip is damaged.
Disclosure of Invention
In order to solve the problem that the large current discharged from the piezoresistor has inevitable interference on a metering chip circuit in the prior art, the embodiment of the invention provides an electric energy meter, which comprises: measurement chip, shunt, piezo-resistor, wherein:
the first welding spot of the current divider is electrically connected with the grounding pin of the metering chip, and the grounding pin of the metering chip is grounded;
the shunt is electrically connected with the first end of the piezoresistor, and the second end of the piezoresistor is electrically connected with the zero line end.
Optionally, the electric energy meter further includes a first wire, and the shunt is electrically connected to the first end of the varistor, including:
the first end of the first wire is connected with the wire inlet end of the shunt, and the second end of the first wire is electrically connected with the first end of the piezoresistor.
Optionally, the electric energy meter still includes the circuit board, measurement chip, piezo-resistor all are set up on the circuit board, the shunt with piezo-resistor's first end electric connection includes:
the second welding spot of the shunt is connected with a third welding spot on the circuit board through a second lead, and the third welding spot is electrically connected with the first end of the piezoresistor.
Optionally, the electric energy meter still includes the circuit board, measurement chip, piezo-resistor all are set up on the circuit board, the shunt with piezo-resistor's first end electric connection includes:
and a fourth wire with a gasket is arranged at a strong current wiring terminal of the shunt, the other end of the fourth wire is connected with a fourth welding spot on the circuit board, and the fourth welding spot is electrically connected with the first end of the piezoresistor.
Optionally, the electric energy meter further includes a transformer and a linear regulator, wherein:
the first end of the piezoresistor is electrically connected with the first primary coil pin of the transformer.
Optionally, a pin of a second primary coil of the transformer is electrically connected with a first end of a thermistor, and a second end of the thermistor is electrically connected with the zero line end;
a first secondary coil pin and a second secondary coil pin of the transformer are respectively and electrically connected with two input ends of the linear voltage stabilizer;
and the output end of the linear voltage stabilizer is connected with a power supply end pin of the metering chip.
Optionally, a fifth welding point of the shunt is electrically connected to a first end of a first resistor, and a second end of the first resistor is electrically connected to a first end of a first capacitor and an IAN pin of the metering chip, respectively;
the sixth welding point of the shunt is electrically connected with the first end of the second resistor, and the second end of the second resistor is respectively electrically connected with the first end of the second capacitor and the IAP pin of the metering chip;
the second end of the first capacitor is connected with the second end of the second capacitor.
Optionally, the shunt is a manganin shunt.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the first welding spot of the shunt is electrically connected with a grounding pin GND of the metering chip, and the grounding pin GND of the metering chip is grounded; the shunt is electrically connected with the first end of the piezoresistor, and the second end of the piezoresistor is electrically connected with the zero line end; the leakage path of the large current generated when the over-high voltage enters the inlet wire end of the electric energy meter is changed, and the leakage path in the electric energy meter is isolated from the metering chip, so that the problem that the large current leaked from the piezoresistor has inevitable interference on a circuit of the metering chip in the related technology is solved, and the effect of ensuring the normal operation of the electric energy meter is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a circuit diagram of some components in an electric energy meter provided in an embodiment of the present invention;
fig. 2 is a circuit diagram of some components in an electric energy meter provided in another embodiment of the present invention;
fig. 3 is a circuit diagram of some components in an electric energy meter according to still another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
An embodiment of the present invention provides an electric energy meter, including: measurement chip, shunt, piezo-resistor, wherein:
the first welding spot of the current divider is electrically connected with a grounding pin GND of the metering chip, and the grounding pin GND of the metering chip is grounded;
the shunt is electrically connected with the first end of the piezoresistor, and the second end of the piezoresistor is electrically connected with the zero line end.
According to the electric energy meter provided by the embodiment of the invention, the first welding spot of the current divider is electrically connected with the grounding pin GND of the metering chip, and the grounding pin GND of the metering chip is grounded; the shunt is electrically connected with the first end of the piezoresistor, and the second end of the piezoresistor is electrically connected with the zero line end; the leakage path of the large current generated when the over-high voltage enters the inlet wire end of the electric energy meter is changed, and the leakage path in the electric energy meter is isolated from the metering chip, so that the problem that the large current leaked from the piezoresistor has inevitable interference on a circuit of the metering chip in the related technology is solved, and the effect of ensuring the normal operation of the electric energy meter is achieved.
The shunt in this embodiment may be a manganin shunt.
Referring to fig. 1, a circuit diagram of a portion of components in an electric energy meter according to an embodiment of the present invention is shown. As shown in fig. 1, the electric energy meter includes a metering chip 10, a shunt 20, a varistor MOV and a first wire 21, wherein:
the first welding point L1 of the shunt 20 is electrically connected to the ground pin GND of the metering chip 10, and the ground pin GND of the metering chip 10 is grounded;
the first end of the first conducting wire 21 is connected to the phase line INPUT terminal LIVE INPUT of the shunt 20, the second end of the first conducting wire 21 is electrically connected to the first end of the varistor MOV, and the second end of the varistor MOV is electrically connected to the NEUTRAL terminal NEUTRAL IN.
Optionally, the electric energy meter further includes a transformer 22, and a first end of the varistor MOV is electrically connected to a first primary coil pin of the transformer 22.
Optionally, a pin of the second primary coil of the transformer 22 is electrically connected to a first end of the thermistor PTCPCT, and a second end of the thermistor PTCPCT is electrically connected to a NEUTRAL end NEUTRAL IN;
the first secondary coil pin and the second secondary coil pin of the transformer 22 are electrically connected to two input terminals of the linear regulator 23, respectively, and the output terminal of the linear regulator 23 is connected to the power supply terminal VDD pin of the metering chip 10.
Optionally, the fifth welding point L6 of the shunt 20 is electrically connected to the first end of the first resistor R1, and the second end of the first resistor R1 is electrically connected to the first end of the first capacitor C1 and the IAN pin of the metering chip 10, respectively;
the sixth pad L7 of the shunt 20 is electrically connected to the first end of the second resistor R2, and the second end of the second resistor R2 is electrically connected to the first end of the second capacitor C2 and the IAP pin of the metrology chip 10, respectively;
the second terminal of the first capacitor C1 is connected to the second terminal of the second capacitor C2.
Optionally, the IMS pin of the metering chip 10 is electrically connected to the phase line OUTPUT terminal LIVE OUTPUT of the shunt 20.
In the embodiment of the invention, the leakage path of the large current generated when the over-high voltage enters the inlet wire end of the electric energy meter is as follows: 1. a phase line inlet end LIVE INPUT to a voltage dependent resistor MOV; 2. the phase line inlet end LIVE INPUT is connected to the transformer 22, passes through the thermistor PTC, and finally returns to the NEUTRAL end NEUTRAL IN; the discharge path is isolated from the metering chip 10, so that the problem that the large current discharged from the MOV of the piezoresistor has inevitable interference on the circuit of the metering chip 10 in the related technology is solved, and the effect of ensuring the normal operation of the electric energy meter is achieved.
In addition, the shunt 20 is connected in series to the resistors R1 and R2 and the capacitors C1 and C2 on the circuit board through the current sampling line for RC filtering, so that the surge leakage process can be effectively buffered.
Referring to fig. 2, a circuit diagram of a portion of components in an electric energy meter according to another embodiment of the present invention is shown. As shown in fig. 2, the electric energy meter includes a circuit board 30, and a metering chip 10, a shunt 20, and a varistor MOV are disposed on the circuit board 30, wherein:
the first pad L1 of the shunt 20 is electrically connected to the ground pin GND of the measurement chip 10, and the ground pin GND of the measurement chip 10 is grounded. Specifically, the first pad L1 of the shunt 20 is connected to the pad M1 of the circuit board 30 by a wire, and the pad M1 is connected to the ground pin GND of the metering chip 10 by a wiring board.
The second pad L2 of the shunt 20 is connected to the third pad L3 of the circuit board 30 via the second wire 31, and the third pad L3 is electrically connected to the first end of the varistor MOV. Specifically, the third pad L3 is connected to the first terminal of the varistor MOV by a wiring board trace. In practical implementation, a second welding point L2 is added on the red copper at the incoming line end of the shunt 20, and then the second welding point L2 is connected with a third welding point L3 on the circuit board 30 through a second lead 31.
Optionally, the electric energy meter further includes a transformer 22, and a first end of the varistor MOV is electrically connected to a first primary coil pin of the transformer 22.
Optionally, a second primary coil pin of the transformer 22 is electrically connected to a first end of the thermistor PTCPCT, and a second end of the thermistor PTCPCT is electrically connected to the NEUTRAL terminal NEUTRAL IN. Specifically, a welding spot M2 is arranged on the circuit board, the welding spot M2 is connected with a NEUTRAL end NEUTRAL IN through a lead, and the welding spot M2 is connected with the second end of the thermistor PTCPCT through circuit board wiring.
The first secondary coil pin and the second secondary coil pin of the transformer 22 are electrically connected to two input terminals of the linear regulator 23, respectively, and the output terminal of the linear regulator 23 is connected to the power supply terminal VDD pin of the metering chip 10.
Optionally, the fifth welding point L6 of the shunt 20 is electrically connected to the first end of the first resistor R1, and the second end of the first resistor R1 is electrically connected to the first end of the first capacitor C1 and the IAN pin of the metering chip 10, respectively;
the sixth pad L7 of the shunt 20 is electrically connected to the first end of the second resistor R2, and the second end of the second resistor R2 is electrically connected to the first end of the second capacitor C2 and the IAP pin of the metrology chip 10, respectively;
the second terminal of the first capacitor C1 is connected to the second terminal of the second capacitor C2.
Optionally, the IMS pin of the metering chip 10 is electrically connected to the phase line OUTPUT terminal LIVE OUTPUT of the shunt 20. Specifically, the phase line outlet end of the shunt 20 is connected to a solder joint on the circuit board through a wire, and the solder joint is connected to the IMS pin of the metering chip 10 through wiring of the circuit board.
In the embodiment of the invention, the leakage path of the large current generated when the over-high voltage enters the inlet wire end of the electric energy meter is as follows: 1. a phase line inlet end LIVE INPUT to a voltage dependent resistor MOV; 2. the phase line inlet end LIVE INPUT is connected to the transformer 22, passes through the thermistor PTC, and finally returns to the NEUTRAL end NEUTRAL IN; the discharge path is isolated from the metering chip 10, so that the problem that the large current discharged from the MOV of the piezoresistor has inevitable interference on the circuit of the metering chip 10 in the related technology is solved, and the effect of ensuring the normal operation of the electric energy meter is achieved.
In addition, the shunt 20 is connected in series to the resistors R1 and R2 and the capacitors C1 and C2 on the circuit board through the current sampling line for RC filtering, so that the surge leakage process can be effectively buffered.
Referring to fig. 3, a circuit diagram of a portion of components in an electric energy meter according to another embodiment of the present invention is shown. As shown in fig. 3, the electric energy meter includes a circuit board 30, and a metering chip 10, a shunt 20, and a varistor MOV are disposed on the circuit board 30, wherein:
the first pad L1 of the shunt 20 is electrically connected to the ground pin GND of the measurement chip 10, and the ground pin GND of the measurement chip 10 is grounded. Specifically, the first pad L1 of the shunt 20 is connected to the pad M1 of the circuit board 30 by a wire, and the pad M1 is connected to the ground pin GND of the metering chip 10 by a wiring board.
A fourth wire 42 with a gasket is arranged at a strong current terminal 41 of the shunt, the other end of the fourth wire 42 is connected with a fourth welding point L5 on the circuit board, and the fourth welding point L5 is electrically connected with a first end of the varistor MOV. Specifically, the fourth pad L5 is electrically connected to the first terminal of the varistor MOV through a wiring board.
Optionally, the electric energy meter further includes a transformer 22, and a first end of the varistor MOV is electrically connected to a first primary coil pin of the transformer 22.
Optionally, a second primary coil pin of the transformer 22 is electrically connected to a first end of the thermistor PTCPCT, and a second end of the thermistor PTCPCT is electrically connected to the NEUTRAL terminal NEUTRAL IN. Specifically, a welding spot M2 is arranged on the circuit board, the welding spot M2 is connected with a NEUTRAL end NEUTRAL IN through a lead, and the welding spot M2 is connected with the second end of the thermistor PTCPCT through circuit board wiring.
The first secondary coil pin and the second secondary coil pin of the transformer 22 are electrically connected to two input terminals of the linear regulator 23, respectively, and the output terminal of the linear regulator 23 is connected to the power supply terminal VDD pin of the metering chip 10.
Optionally, the fifth welding point L6 of the shunt 20 is electrically connected to the first end of the first resistor R1, and the second end of the first resistor R1 is electrically connected to the first end of the first capacitor C1 and the IAN pin of the metering chip 10, respectively;
the sixth pad L7 of the shunt 20 is electrically connected to the first end of the second resistor R2, and the second end of the second resistor R2 is electrically connected to the first end of the second capacitor C2 and the IAP pin of the metrology chip 10, respectively;
the second terminal of the first capacitor C1 is connected to the second terminal of the second capacitor C2.
Optionally, the IMS pin of the metering chip 10 is electrically connected to the phase line OUTPUT terminal LIVE OUTPUT of the shunt 20. Specifically, the phase line outlet end of the shunt 20 is connected to a solder joint on the circuit board through a wire, and the solder joint is connected to the IMS pin of the metering chip 10 through wiring of the circuit board.
In the embodiment of the invention, the leakage path of the large current generated when the over-high voltage enters the inlet wire end of the electric energy meter is as follows: 1. a phase line inlet end LIVE INPUT to a voltage dependent resistor MOV; 2. the phase line inlet end LIVE INPUT is connected to the transformer 22, passes through the thermistor PTC, and finally returns to the NEUTRAL end NEUTRAL IN; the discharge path is isolated from the metering chip 10, so that the problem that the large current discharged from the MOV of the piezoresistor has inevitable interference on the circuit of the metering chip 10 in the related technology is solved, and the effect of ensuring the normal operation of the electric energy meter is achieved.
In addition, the shunt 20 is connected in series to the resistors R1 and R2 and the capacitors C1 and C2 on the circuit board through the current sampling line for RC filtering, so that the surge leakage process can be effectively buffered.
The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying a number of the indicated technical features. Thus, a defined feature of "first", "second", may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (5)

1. An electric energy meter, characterized in that the electric energy meter comprises: measurement chip, shunt, piezo-resistor, transformer, thermistor and linear voltage regulator, wherein:
the first welding spot of the current divider is electrically connected with the grounding pin of the metering chip, and the grounding pin of the metering chip is grounded;
the phase line inlet end of the shunt is electrically connected with the first end of the piezoresistor, the second end of the piezoresistor is electrically connected with the zero line end, and the first end of the piezoresistor is electrically connected with the first primary coil pin of the transformer;
a second primary coil pin of the transformer is electrically connected with a first end of the thermistor, and a second end of the thermistor is electrically connected with the zero line end; a first secondary coil pin and a second secondary coil pin of the transformer are respectively and electrically connected with two input ends of the linear voltage stabilizer; the output end of the linear voltage stabilizer is connected with a power supply end pin of the metering chip;
the fifth welding point of the shunt is electrically connected with the first end of the first resistor, and the second end of the first resistor is respectively electrically connected with the first end of the first capacitor and the IAN pin of the metering chip; the sixth welding point of the shunt is electrically connected with the first end of the second resistor, and the second end of the second resistor is respectively electrically connected with the first end of the second capacitor and the IAP pin of the metering chip; the second end of the first capacitor is connected with the second end of the second capacitor;
the leakage path of the large current generated when the over-high voltage enters the inlet wire end of the electric energy meter is as follows:
a first discharge path: the high current generated when the over-high voltage enters the inlet wire end of the electric energy meter enters the voltage dependent resistor from the inlet wire end of the phase line of the shunt and is then output from the zero line end;
a second discharge path: the high current generated when the over-high voltage enters the inlet wire end of the electric energy meter enters the transformer from the inlet wire end of the phase line of the shunt and is output from the zero line end through the thermistor;
the first and second discharge paths are isolated from the metering chip.
2. The electric energy meter according to claim 1, further comprising a first conductor, wherein the phase line incoming end of the shunt is electrically connected to the first end of the voltage dependent resistor, and the first conductor comprises:
the first end of the first wire is connected with the phase line inlet end of the shunt, and the second end of the first wire is electrically connected with the first end of the piezoresistor.
3. The electric energy meter according to claim 1, further comprising a circuit board, wherein the metering chip and the voltage dependent resistor are both disposed on the circuit board, and a phase line inlet end of the shunt is electrically connected to a first end of the voltage dependent resistor, comprising:
the second welding spot of the shunt is connected with a third welding spot on the circuit board through a second lead, and the third welding spot is electrically connected with the first end of the piezoresistor.
4. The electric energy meter according to claim 1, further comprising a circuit board, wherein the metering chip and the voltage dependent resistor are both disposed on the circuit board, and a phase line inlet end of the shunt is electrically connected to a first end of the voltage dependent resistor, comprising:
and a fourth wire with a gasket is arranged at a strong current wiring terminal of the shunt, the other end of the fourth wire is connected with a fourth welding spot on the circuit board, and the fourth welding spot is electrically connected with the first end of the piezoresistor.
5. The electrical energy meter of claim 1, wherein the shunt is a manganin shunt.
CN201810154790.7A 2018-02-23 2018-02-23 Electric energy meter Active CN108254600B (en)

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CN108254600B true CN108254600B (en) 2020-12-18

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CN203249946U (en) * 2013-06-04 2013-10-23 威胜集团有限公司 Three-phase keyboard type electric energy meter
CN103913612B (en) * 2014-04-03 2016-05-11 安徽永安电子科技有限公司 A kind of ammeter terminal base
CN104242688A (en) * 2014-09-29 2014-12-24 苏州克兰兹电子科技有限公司 Power circuit of electric energy measuring chip
CN204613269U (en) * 2015-04-10 2015-09-02 安徽永安电子科技有限公司 A kind of integrated-type intelligent ammeter terminal base
CN204789669U (en) * 2015-06-29 2015-11-18 宁波三星智能电气有限公司 Current sampling circuit
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