CN213023299U - AC sampling circuit for power distribution gateway - Google Patents
AC sampling circuit for power distribution gateway Download PDFInfo
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- CN213023299U CN213023299U CN202021539953.2U CN202021539953U CN213023299U CN 213023299 U CN213023299 U CN 213023299U CN 202021539953 U CN202021539953 U CN 202021539953U CN 213023299 U CN213023299 U CN 213023299U
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Abstract
The utility model relates to a distribution gate exchanges sampling circuit. The device comprises a current sampling circuit and a voltage sampling circuit, wherein the voltage sampling circuit is composed of a voltage transformer T1, resistors R1, R2, R3, R4, capacitors C1, C2, a diode D1, magnetic beads L1 and L2, and the output of the voltage transformer T1 is connected with a TVS diode D1 in parallel; one end of the output of the voltage transformer T1 is connected with one end of the resistor R2, the other end of the output of the voltage transformer T1 is connected with the resistor R3, and the other end of the resistor R2 is connected with the other end of the resistor R3 and grounded; the current sampling circuit is composed of a voltage transformer H1, resistors R5, R6, R7, R8, capacitors C3 and C4, diodes D2 and D3, magnetic beads L3 and L4, wherein the output of the voltage transformer H1 is connected with the diodes D2 and D3 in parallel, and the polarities of the diodes D2 and D3 are opposite. The utility model provides the high interference immunity of distribution measurement sampling has strengthened metering device's reliability, circuit structure is simple, convenient to use.
Description
Technical Field
The utility model relates to an exchange sampling measurement technical field, especially relate to a distribution gate exchanges sampling circuit.
Background
The electric energy metering device of the power distribution gateway is a metering device for trade settlement of both power supply and power utilization parties, and the operation stability and errors of the electric energy metering device of the gateway are particularly important because the electric quantity of important gateway transactions is very large. In actual operation, the sampling circuit of the power distribution gateway electric energy metering device is found to be easily interfered by factors such as an electromagnetic field, surge transient and the like, so that the circuit is damaged and the precision is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at not enough to the prior art, provide a distribution gateway and exchange sampling circuit, improved the anti-interference of distribution measurement sampling, strengthened metering device's reliability.
In order to realize the purpose, the technical scheme of the utility model is as follows: the alternating current sampling circuit of the power distribution gateway comprises a current sampling circuit and a voltage sampling circuit, wherein the voltage sampling circuit is composed of a voltage transformer T1, resistors R1, R2, R3, R4, capacitors C1, C2, a diode D1, magnetic beads L1 and L2, and the output of the voltage transformer T1 is connected with a TVS diode D1 in parallel; one end of the output of the voltage transformer T1 is connected with one end of the resistor R2, the other end of the output of the voltage transformer T1 is connected with the resistor R3, and the other end of the resistor R2 is connected with the other end of the resistor R3 and grounded; one end of the output of the voltage transformer T1 is also connected with a resistor R1, the other end of the resistor R1 is connected with a magnetic bead L1 in series, and the magnetic bead L1 is connected with one end of a capacitor C1; the other end of the output of the voltage transformer T1 is also connected with a resistor R4, the other end of the resistor R4 is connected with a magnetic bead L2 in series, the magnetic bead L2 is connected with one end of a capacitor C2, and the other end of the capacitor C1 is connected with the other end of the capacitor C2 and then grounded;
the current sampling circuit is composed of a voltage transformer H1, resistors R5, R6, R7, R8, capacitors C3 and C4, diodes D2 and D3, magnetic beads L3 and L4, wherein the output of the voltage transformer H1 is connected with the diodes D2 and D3 in parallel, and the polarities of the diodes D2 and D3 are opposite; one end of the output of the current transformer H1 is connected with one end of the resistor R6, the other end of the output of the current transformer H1 is connected with the resistor R7, and the other end of the resistor R6 is connected with the other end of the resistor R7 and grounded; the other end of the output of the current transformer T1 is also connected with a resistor R5, the other end of the resistor R5 is connected with a magnetic bead L3 in series, and the magnetic bead L3 is connected with one end of a capacitor C3; one end of the output of the current transformer H1 is further connected with a resistor R8, the other end of the resistor R8 is connected with a magnetic bead L4 in series, the magnetic bead L4 is connected with one end of a capacitor C4, and the other end of the capacitor C3 is connected with the other end of the capacitor C4 and then grounded.
Preferably, the resistors R1 and R4 have the same resistance, and the resistors R5 and R8 have the same resistance.
Preferably, the diode D1 is a transient voltage suppression diode.
The utility model provides the high interference immunity of distribution measurement sampling has strengthened metering device's reliability, circuit structure is simple, convenient to use.
Drawings
Fig. 1 the present invention discloses a voltage sampling circuit diagram.
Fig. 2 is a circuit diagram of current sampling according to the present invention.
Detailed Description
The principles and embodiments of the present invention will be further described with reference to the drawings.
As shown in fig. 1-2, the ac sampling circuit for power distribution gateway of the present invention includes a current sampling circuit and a voltage sampling circuit. The voltage sampling circuit is composed of a voltage transformer T1, resistors R1, R2, R3, R4, capacitors C1 and C2, a diode D1, magnetic beads L1 and L2, and the output of the voltage transformer T1 is connected with a TVS diode D1 in parallel. The diode D1 is a transient voltage suppressor diode, and the diode D1 can absorb the surge voltage entering from the voltage transformer so as to protect the subsequent circuit from being damaged.
One end of the output of the voltage transformer T1 is connected to one end of the resistor R2, the other end of the output of the voltage transformer T1 is connected to the resistor R3, and the other end of the resistor R2 is connected to the other end of the resistor R3 and grounded. One end of the output of the voltage transformer T1 is further connected with a resistor R1, the other end of the resistor R1 is connected with a magnetic bead L1 in series, and the magnetic bead L1 is connected with one end of a capacitor C1. The other end of the output of the voltage transformer T1 is further connected with a resistor R4, the other end of the resistor R4 is connected with a magnetic bead L2 in series, the magnetic bead L2 is connected with one end of a capacitor C2, and the other end of the capacitor C1 is connected with the other end of the capacitor C2 and then grounded. The circuit structure forms a signal differential input, has strong common-mode interference resistance, and a filter circuit formed by the resistor, the magnetic beads and the capacitor further filters interference signals.
The current sampling circuit is composed of a voltage transformer H1, resistors R5, R6, R7, R8, capacitors C3 and C4, diodes D2 and D3, magnetic beads L3 and L4, wherein the output of the voltage transformer H1 is connected with the diodes D2 and D3 in parallel, and the polarities of the diodes D2 and D3 are opposite. The diodes D2 and D3 are connected in reverse parallel to limit the signal of the current transformer to +/-0.7V, so that the rear-stage circuit is protected.
One end of the output of the current transformer H1 is connected to one end of the resistor R6, the other end of the output of the current transformer H1 is connected to the resistor R7, and the other end of the resistor R6 is connected to the other end of the resistor R7 and grounded. One end of the output of the current transformer H1 is further connected with a resistor R5, the other end of the resistor R5 is connected with a magnetic bead L3 in series, and the magnetic bead L3 is connected with one end of a capacitor C3. The other end of the output of the current transformer H1 is further connected with a resistor R8, the other end of the resistor R8 is connected with a magnetic bead L4 in series, the magnetic bead L4 is connected with one end of a capacitor C4, and the other end of the capacitor C3 is connected with the other end of the capacitor C4 and then grounded.
In order to optimize the common mode interference resistance, the resistors R1 and R4 should have the same resistance, and the resistors R5 and R8 should have the same resistance.
The utility model provides the high interference immunity of distribution measurement sampling has strengthened metering device's reliability and circuit and has fine spreading value simply.
Claims (3)
1. The alternating current sampling circuit of the power distribution gateway comprises a current sampling circuit and a voltage sampling circuit, and is characterized in that the voltage sampling circuit is composed of a voltage transformer T1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, capacitors C1, C2, a diode D1, a magnetic bead L1 and a magnetic bead L2, wherein the output of the voltage transformer T1 is connected with a TVS diode D1 in parallel; one end of the output of the voltage transformer T1 is connected with one end of the resistor R2, the other end of the output of the voltage transformer T1 is connected with the resistor R3, and the other end of the resistor R2 is connected with the other end of the resistor R3 and grounded; one end of the output of the voltage transformer T1 is also connected with a resistor R1, the other end of the resistor R1 is connected with a magnetic bead L1 in series, and the magnetic bead L1 is connected with one end of a capacitor C1; the other end of the output of the voltage transformer T1 is also connected with a resistor R4, the other end of the resistor R4 is connected with a magnetic bead L2 in series, the magnetic bead L2 is connected with one end of a capacitor C2, and the other end of the capacitor C1 is connected with the other end of the capacitor C2 and then grounded;
the current sampling circuit is composed of a voltage transformer H1, resistors R5, R6, R7, R8, capacitors C3 and C4, diodes D2 and D3, magnetic beads L3 and L4, wherein the output of the voltage transformer H1 is connected with the diodes D2 and D3 in parallel, and the polarities of the diodes D2 and D3 are opposite; one end of the output of the current transformer H1 is connected with one end of the resistor R6, the other end of the output of the current transformer H1 is connected with the resistor R7, and the other end of the resistor R6 is connected with the other end of the resistor R7 and grounded; the other end of the output of the current transformer T1 is also connected with a resistor R5, the other end of the resistor R5 is connected with a magnetic bead L3 in series, and the magnetic bead L3 is connected with one end of a capacitor C3; one end of the output of the current transformer H1 is further connected with a resistor R8, the other end of the resistor R8 is connected with a magnetic bead L4 in series, the magnetic bead L4 is connected with one end of a capacitor C4, and the other end of the capacitor C3 is connected with the other end of the capacitor C4 and then grounded.
2. The ac sampling circuit of claim 1, wherein the resistors R1 and R4 have the same resistance, and the resistors R5 and R8 have the same resistance.
3. The electrical distribution gateway ac sampling circuit of claim 1, wherein said diode D1 is a transient voltage suppression diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021539953.2U CN213023299U (en) | 2020-07-30 | 2020-07-30 | AC sampling circuit for power distribution gateway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021539953.2U CN213023299U (en) | 2020-07-30 | 2020-07-30 | AC sampling circuit for power distribution gateway |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213023299U true CN213023299U (en) | 2021-04-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021539953.2U Active CN213023299U (en) | 2020-07-30 | 2020-07-30 | AC sampling circuit for power distribution gateway |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213023299U (en) |
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2020
- 2020-07-30 CN CN202021539953.2U patent/CN213023299U/en active Active
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