CN214959491U - Isolation and coupling circuit - Google Patents
Isolation and coupling circuit Download PDFInfo
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- CN214959491U CN214959491U CN202120437636.8U CN202120437636U CN214959491U CN 214959491 U CN214959491 U CN 214959491U CN 202120437636 U CN202120437636 U CN 202120437636U CN 214959491 U CN214959491 U CN 214959491U
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Abstract
The utility model discloses an keep apart and coupling circuit, the switch can be in the closure state under the power consumption normal condition, keeps apart and is the short circuit state with coupling circuit's both ends short circuit, can not influence the normal work of low voltage distribution network, and the switch is in the off-state under the power consumption abnormal conditions, and the power failure side carries the carrier signal that the power failure information can be through keeping apart and coupling circuit's coupling function with signal transmission to the concentrator department of electrified side. In addition, in the signal transmission process, the isolation and coupling circuit can also isolate power frequency voltage, and the power safety of the power failure side is ensured on the premise that the normal transmission of the carrier signal coupled from the power failure side is not interfered. Compared with the mode of reporting the power failure information by using the wireless module, the method has the advantages that the manufacturing cost is reduced, meanwhile, the accuracy, the success rate and the safety of the power failure information transmission process are guaranteed, and the efficiency of power failure emergency repair maintenance work is improved.
Description
Technical Field
The utility model relates to a carrier signal transmission technical field especially relates to an keep apart and coupling circuit.
Background
With the continuous development of Chinese economy and the continuous improvement of the quality of life of residents, the requirements of power utilization customers in the low-voltage power distribution network on power failure recovery are stricter and stricter. At present, an HPLC communication module can be inserted into a terminal intelligent electric meter to monitor the power utilization condition of a user in real time and report information to a concentrator local communication module in time. However, data transmission of HPLC communication uses a power line as a channel, so when power utilization is in a problem, a switch cuts off electric energy flow, and carrier information flow cannot be transmitted through the power line, so that power failure information cannot be obtained in time and emergency repair cannot be performed. In addition, some existing solutions use a wireless module to report power failure information through wireless transmission, but the manufacturing cost of the wireless transmission module is high, and the wireless transmission module is difficult to be widely used in practice.
SUMMERY OF THE UTILITY MODEL
The utility model provides an keep apart and coupling circuit can't pass through power line transmission carrier signal when the switch disconnection with solving prior art, and then there is the technical problem that manufacturing cost is high through wireless transmission.
According to an aspect of the utility model provides an keep apart and coupling circuit for the carrier signal that will have a power failure side to carry the power failure information under the condition of switch disconnection crosses the concentrator of switch transmission to electrified side, keep apart and coupling circuit's first end and the live wire of switch electrified side are connected, and the third end is connected with the zero line of switch electrified side, and the second end is connected with the live wire of switch outage side, and the fourth end is connected with the zero line of switch outage side, and the switch is closed when the power consumption is normal, keep apart and coupling circuit is short circuit state, switch disconnection when the power consumption is unusual, and the carrier signal of switch outage side transmits to switch electrified side through the coupling function of keeping apart and coupling circuit.
Furthermore, the isolation and coupling circuit comprises two piezoresistors, a filter circuit and a coupling magnetic ring coil, the output end of the filter circuit is respectively connected with the live wire and the zero wire on the live side of the switch, the input end of the filter circuit is connected with the second side of the coupling magnetic ring coil, the second side of the coupling magnetic ring coil is also connected with the zero wire on the live side of the switch, the first side of the coupling magnetic ring coil is respectively connected with the live wire and the zero wire on the power failure side of the switch, one of the piezoresistors is connected with the filter circuit in parallel, and the other one of the piezoresistors is connected with the first side of the coupling magnetic ring coil in parallel.
Further, the turn ratio of the coupling magnetic ring coil is 1: 1.
furthermore, the isolation and coupling circuit further comprises a current limiting resistor R15 arranged between the live wire on the power-off side of the switch and the coupling magnetic ring coil, and used for protecting the coupling magnetic ring coil.
Furthermore, the filter circuit comprises a first passive wave trap, a second passive wave trap and a third passive wave trap which are sequentially connected in series from the live side to the power failure side.
Further, the first passive trap filter comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4, the second passive trap filter comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C5, a capacitor C6, a capacitor C7 and a capacitor C8, the third passive trap filter comprises a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C9, a capacitor C10, a capacitor C11 and a capacitor C12,
a first end of a capacitor C1 and a first end of a resistor R3 are both connected with a live wire on the live side of the switch, a second end of a capacitor C1 is respectively connected with a first end of a resistor R1, a first end of a resistor R2 and a first end of a capacitor C2, a second end of a resistor R1 is connected with a first end of a capacitor C3, a second end of a resistor R2 is connected with a first end of a capacitor C4, a second end of a resistor R3 is respectively connected with a second end of a capacitor C3, a second end of a capacitor C4 and a first end of a resistor R4, and a second end of a capacitor C2 is respectively connected with a first end of a capacitor C5 and a second end of a resistor R4;
a second end of the capacitor C5 is connected to a first end of the resistor R5, a first end of the capacitor C6, and a first end of the resistor R6, a second end of the resistor R5 is connected to a first end of the capacitor C7, a second end of the resistor R6 is connected to a first end of the capacitor C8, a first end of the resistor R7 is connected to a second end of the resistor R4, a second end of the resistor R7 is connected to a second end of the capacitor C7, a second end of the capacitor C8, and a first end of the resistor R8, and a second end of the capacitor C6 is connected to a first end of the capacitor C9 and a second end of the resistor R8;
a second end of the capacitor C9 is connected with a first end of the resistor R9, a first end of the resistor R10 and a first end of the capacitor C10, a second end of the resistor R9 is connected with a first end of the capacitor C11, a second end of the resistor R10 is connected with a first end of the capacitor C12, a first end of the resistor R11 is connected with a second end of the resistor R8, a second end of the resistor R11 is connected with a second end of the capacitor C11, a second end of the capacitor C12 and a first end of the resistor R12, and a second end of the capacitor C10 and a second end of the resistor R12 are both connected with a second side of the coupling magnetic loop coil;
the first terminal of the capacitor C3, the first terminal of the capacitor C4, the first terminal of the capacitor C7, the first terminal of the capacitor C8, the first terminal of the capacitor C11, and the first terminal of the capacitor C12 are all grounded.
Further, the first passive trap is a 50Hz trap, the second passive trap is a 150Hz trap, and the third passive trap is a 250Hz trap.
Furthermore, the filter circuit further comprises a resistor R13 and a resistor R14 which are used for playing a role in protecting a circuit and stabilizing signals, a first end of the resistor R13 is connected with a second end of the capacitor C10 and a second end of the resistor R12 respectively, a second end of the resistor R13 is connected with a second side of the coupling magnetic ring coil, a first end of the resistor R14 is connected with a zero line on the live side of the switch, and a second end of the resistor R14 is connected with the second side of the coupling magnetic ring coil.
Furthermore, the resistances of the resistors included in the first passive trap and the second passive trap are 11.8K Ω, the resistances of the resistors included in the third passive trap are 7.15K Ω, the capacitance values of the capacitors included in the first passive trap are 270nF, and the capacitance values of the capacitors included in the second passive trap and the third passive trap are 91 nF.
Further, the model of the piezoresistor is CNR-14D 561K.
The utility model discloses has following effect:
the utility model discloses an keep apart and coupling circuit, the switch can be in the closure state under the power consumption normal condition, keeps apart and is the short circuit state with coupling circuit's both ends short circuit, can not influence the normal work of low voltage distribution network, and the switch is in the off-state under the power consumption abnormal conditions, and the power failure side carries the carrier signal that the power failure information can be through keeping apart and coupling circuit's coupling function with signal transmission to the concentrator department of electrified side. In addition, in the signal transmission process, the isolation and coupling circuit can also isolate power frequency voltage, and the normal transmission of the carrier signal coupled from the power failure side cannot be interfered. Compared with the mode of reporting the power failure information by using the wireless module, the method has the advantages that the manufacturing cost is reduced, meanwhile, the accuracy, the success rate and the safety of the power failure information transmission process are guaranteed, and the efficiency of power failure emergency repair maintenance work is improved.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
fig. 1 is a schematic diagram of the connection of the isolation and coupling circuit to the live side and the dead side of the switch according to the preferred embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of an isolation and coupling circuit according to a preferred embodiment of the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered below.
As shown in fig. 1, the preferred embodiment of the present invention provides an isolation and coupling circuit, for the carrier signal carrying the power failure information on the power failure side under the condition of switch disconnection crosses the switch and transmits to the concentrator on the live side, the first end of the isolation and coupling circuit is connected to the live wire on the live side of the switch, the third end is connected to the zero wire on the live side of the switch, the second end is connected to the live wire on the power failure side of the switch, the fourth end is connected to the zero wire on the power failure side of the switch, thereby forming two new closed loops, and no line between the two loops is directly connected, and the signal is transmitted only through the coupling function generated by the isolation and coupling circuit. When the electricity consumption is normal, the switch is closed, the isolation and coupling circuit is in a short-circuit state, when the electricity consumption is abnormal, the switch is opened, and the carrier signal at the power-off side of the switch is transmitted to the electrified side of the switch through the coupling function of the isolation and coupling circuit.
It can be understood that the isolation and coupling circuit of this embodiment, the switch can be in the closure state under the normal condition of power consumption, and the both ends short circuit of isolation and coupling circuit is the short circuit state, can not influence the normal work of low voltage distribution network, and the switch is in the off-state under the power consumption abnormal conditions, and the carrier signal that the power failure side carried the power failure information can be through isolation and coupling circuit's coupling function with signal transmission to electrified side's concentrator department. In addition, in the signal transmission process, the isolation and coupling circuit can also isolate power frequency voltage, and the normal transmission of the carrier signal coupled from the power failure side cannot be interfered. Compared with the mode of reporting the power failure information by using the wireless module, the method has the advantages that the manufacturing cost is reduced, meanwhile, the accuracy, the success rate and the safety of the power failure information transmission process are guaranteed, and the efficiency of power failure emergency repair maintenance work is improved.
Specifically, as shown in fig. 2, the isolation and coupling circuit includes two varistors MOV, a filter circuit and a coupling magnetic loop coil T1, an output end of the filter circuit is connected to a live line and a neutral line on a live side of the switch respectively, an input end of the filter circuit is connected to a second side of the coupling magnetic loop coil T1, the second side of the coupling magnetic loop coil T1 is further connected to the neutral line on the live side of the switch, a first side of the coupling magnetic loop coil T1 is connected to the live line and the neutral line on a power failure side of the switch respectively, one of the varistors MOV is connected in parallel to the filter circuit, and the other of the varistors MOV is connected in parallel to the first side of the coupling magnetic loop coil T1. When the switch is in a closed state, the isolation and coupling circuit is in a short-circuit state, and when the switch is in an open state, the carrier signal on the power-off side is transmitted to the live side through the coupling function of the coupling magnetic ring coil T1, and is filtered through the filter circuit. Preferably, the turn ratio of the coupling magnetic loop coil T1 is 1: and 1, the carrier signal coupled to the charged side does not need to be subjected to signal amplification, signal modulation and the like, so that unnecessary signal attenuation is reduced. Of course, in other embodiments of the present invention, other ratios may be selected for the turn ratio of the coupling magnetic loop coil T1, and only additional signal amplifying circuit and signal modulating circuit need to be provided for further signal processing, so as to prevent signal attenuation. Wherein, the varistor MOV plays a role of preventing overvoltage generated at the moment of circuit connection from damaging the filter circuit, and the type of the varistor MOV is CNR-14D 561K.
In addition, the isolation and coupling circuit further comprises a current limiting resistor R15 arranged between a live wire on the power-off side of the switch and the coupling magnetic loop coil T1 and used for protecting the coupling magnetic loop coil T1. The resistance value of the current limiting resistor R15 is 3K omega.
Specifically, the filter circuit comprises a first passive wave trap, a second passive wave trap and a third passive wave trap which are sequentially connected in series from the live side to the power failure side. The isolation and coupling circuit is used for isolating voltage and signal coupling, the main part of the circuit is a filter circuit, usually, the filter circuit only considers unidirectional filtering and uses an active device, but the active filter can cause signal problems when the signal needs to be transmitted reversely, and therefore the active filter cannot be used. Consider 3 times, 5 times harmonic that exist in a large number in the low voltage electric wire netting simultaneously, the utility model discloses a filter circuit is established ties by three RC passive filter and is constituteed, both can realize the two-way transmission signal, can filter again and fall the harmonic signal.
The first passive trap filter comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4, the second passive trap filter comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C5, a capacitor C6, a capacitor C7 and a capacitor C8, and the third passive trap filter comprises a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C9, a capacitor C10, a capacitor C11 and a capacitor C12. The first end of the capacitor C1 and the first end of the resistor R3 are both connected with a live wire on the live side of the switch, the second end of the capacitor C1 is respectively connected with the first end of the resistor R1, the first end of the resistor R2 and the first end of the capacitor C2, the second end of the resistor R1 is connected with the first end of the capacitor C3, the second end of the resistor R2 is connected with the first end of the capacitor C4, the second end of the resistor R3 is respectively connected with the second end of the capacitor C3, the second end of the capacitor C4 and the first end of the resistor R4, and the second end of the capacitor C2 is respectively connected with the first end of the capacitor C5 and the second end of the resistor R4. The second end of the capacitor C5 is connected to the first end of the resistor R5, the first end of the capacitor C6, and the first end of the resistor R6, the second end of the resistor R5 is connected to the first end of the capacitor C7, the second end of the resistor R6 is connected to the first end of the capacitor C8, the first end of the resistor R7 is connected to the second end of the resistor R4, the second end of the resistor R7 is connected to the second end of the capacitor C7, the second end of the capacitor C8, and the first end of the resistor R8, and the second end of the capacitor C6 is connected to the first end of the capacitor C9 and the second end of the resistor R8. The second end of the capacitor C9 is connected to the first end of the resistor R9, the first end of the resistor R10, and the first end of the capacitor C10, the second end of the resistor R9 is connected to the first end of the capacitor C11, the second end of the resistor R10 is connected to the first end of the capacitor C12, the first end of the resistor R11 is connected to the second end of the resistor R8, the second end of the resistor R11 is connected to the second end of the capacitor C11, the second end of the capacitor C12, and the first end of the resistor R12, and the second end of the capacitor C10 and the second end of the resistor R12 are both connected to the second side of the coupling magnetic loop coil T1. Moreover, the first terminal of the capacitor C3, the first terminal of the capacitor C4, the first terminal of the capacitor C7, the first terminal of the capacitor C8, the first terminal of the capacitor C11, and the first terminal of the capacitor C12 are all grounded.
The first passive wave trap is a 50Hz wave trap, the second passive wave trap is a 150Hz wave trap, and the third passive wave trap is a 250Hz wave trap. The resistance values of the resistors contained in the first passive trap and the second passive trap are 11.8K omega, the resistance values of the resistors contained in the third passive trap are 7.15K omega, the capacitance values of the capacitors contained in the first passive trap are 270nF, and the capacitance values of the capacitors contained in the second passive trap and the third passive trap are 91 nF.
In addition, the filter circuit further comprises a load resistor R13 and a load resistor R14 which are used for playing a role in protecting a circuit and stabilizing signals, a first end of a resistor R13 is connected with a second end of a capacitor C10 and a second end of a resistor R12 respectively, a second end of a resistor R13 is connected with a second side of a coupling magnetic loop coil T1, a first end of a resistor R14 is connected with a zero line on the live side of the switch, and a second end of a resistor R14 is connected with a second side of a coupling magnetic loop coil T1. The first end of the capacitor C1 and the first end of the resistor R3 are the first end of the filter circuit, the first end of the resistor R14 is the third end of the filter circuit, the upper end of the first side of the coupling magnetic loop coil T1 is the second end of the filter circuit, and the lower end of the first side of the coupling magnetic loop coil T1 is the fourth end of the filter circuit.
When in use, the working principle is as follows: when the switch is disconnected to cause power failure, under the power support of the super capacitor, a carrier signal carrying power failure information can be transmitted to a power line on the power failure side from an HPLC module on the power failure side, and at the disconnected switch, the carrier signal is connected into a circuit through a second end and a fourth end of the isolation and coupling circuit and then is coupled to the live side from the power failure side through a coupling magnetic ring coil T1. The turn ratio of the coupling magnetic ring coil T1 is 1: 1, the carrier signal coupled to the charged side does not need to be subjected to signal amplification, signal modulation and other operations, and unnecessary signal attenuation is reduced. After the carrier signal coupled to the live side passes through the filter circuit in a lossless manner, the carrier signal is transmitted to a live side power line through the first end and the third end of the filter circuit, and then the carrier signal is transmitted to the concentrator local communication module through the power line. In the signal transmission process, the isolation and coupling circuit can realize the isolation of power frequency voltage, and the normal transmission of the carrier information coupled from the power failure side can not be interfered.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An isolation and coupling circuit for transmitting a carrier signal carrying blackout information on a blackout side to a concentrator on a live side across a switch in a case where the switch is turned off,
the first end of the isolation and coupling circuit is connected with a live wire on the live side of the switch, the third end of the isolation and coupling circuit is connected with a zero line on the live side of the switch, the second end of the isolation and coupling circuit is connected with a live wire on the power-off side of the switch, the fourth end of the isolation and coupling circuit is connected with a zero line on the power-off side of the switch, the switch is closed when the power consumption is normal, the isolation and coupling circuit is in a short-circuit state, the switch is disconnected when the power consumption is abnormal, and the carrier signal on the power-off side of the switch is transmitted to the live side of the switch through the coupling function of the isolation and coupling circuit.
2. The isolation and coupling circuit of claim 1,
the isolation and coupling circuit comprises two piezoresistors, a filter circuit and a coupling magnetic ring coil, wherein the output end of the filter circuit is respectively connected with a live wire and a zero wire on the live side of the switch, the input end of the filter circuit is connected with the second side of the coupling magnetic ring coil, the second side of the coupling magnetic ring coil is also connected with the zero wire on the live side of the switch, the first side of the coupling magnetic ring coil is respectively connected with the live wire and the zero wire on the power failure side of the switch, one of the piezoresistors is connected with the filter circuit in parallel, and the other piezoresistor is connected with the first side of the coupling magnetic ring coil in parallel.
3. The isolation and coupling circuit of claim 2,
the turn ratio of the coupling magnetic ring coil is 1: 1.
4. the isolation and coupling circuit of claim 2,
the isolation and coupling circuit further comprises a current limiting resistor R15 arranged between the live wire at the power-off side of the switch and the coupling magnetic ring coil and used for protecting the coupling magnetic ring coil.
5. The isolation and coupling circuit of claim 2,
the filter circuit comprises a first passive wave trap, a second passive wave trap and a third passive wave trap which are sequentially connected in series from the live side to the power failure side.
6. The isolation and coupling circuit of claim 5,
the first passive trap comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4, the second passive trap comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C5, a capacitor C6, a capacitor C7 and a capacitor C8, the third passive trap comprises a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C9, a capacitor C10, a capacitor C11 and a capacitor C12,
a first end of a capacitor C1 and a first end of a resistor R3 are both connected with a live wire on the live side of the switch, a second end of a capacitor C1 is respectively connected with a first end of a resistor R1, a first end of a resistor R2 and a first end of a capacitor C2, a second end of a resistor R1 is connected with a first end of a capacitor C3, a second end of a resistor R2 is connected with a first end of a capacitor C4, a second end of a resistor R3 is respectively connected with a second end of a capacitor C3, a second end of a capacitor C4 and a first end of a resistor R4, and a second end of a capacitor C2 is respectively connected with a first end of a capacitor C5 and a second end of a resistor R4;
a second end of the capacitor C5 is connected to a first end of the resistor R5, a first end of the capacitor C6, and a first end of the resistor R6, a second end of the resistor R5 is connected to a first end of the capacitor C7, a second end of the resistor R6 is connected to a first end of the capacitor C8, a first end of the resistor R7 is connected to a second end of the resistor R4, a second end of the resistor R7 is connected to a second end of the capacitor C7, a second end of the capacitor C8, and a first end of the resistor R8, and a second end of the capacitor C6 is connected to a first end of the capacitor C9 and a second end of the resistor R8;
a second end of the capacitor C9 is connected with a first end of the resistor R9, a first end of the resistor R10 and a first end of the capacitor C10, a second end of the resistor R9 is connected with a first end of the capacitor C11, a second end of the resistor R10 is connected with a first end of the capacitor C12, a first end of the resistor R11 is connected with a second end of the resistor R8, a second end of the resistor R11 is connected with a second end of the capacitor C11, a second end of the capacitor C12 and a first end of the resistor R12, and a second end of the capacitor C10 and a second end of the resistor R12 are both connected with a second side of the coupling magnetic loop coil;
the first terminal of the capacitor C3, the first terminal of the capacitor C4, the first terminal of the capacitor C7, the first terminal of the capacitor C8, the first terminal of the capacitor C11, and the first terminal of the capacitor C12 are all grounded.
7. The isolation and coupling circuit of claim 6,
the first passive trap is a 50Hz trap, the second passive trap is a 150Hz trap, and the third passive trap is a 250Hz trap.
8. The isolation and coupling circuit of claim 6,
the filter circuit further comprises a resistor R13 and a resistor R14 which are used for playing a role in protecting a circuit and stabilizing signals, a first end of the resistor R13 is connected with a second end of the capacitor C10 and a second end of the resistor R12 respectively, a second end of the resistor R13 is connected with a second side of the coupling magnetic ring coil, a first end of the resistor R14 is connected with a zero line on the electrified side of the switch, and a second end of the resistor R14 is connected with a second side of the coupling magnetic ring coil.
9. The isolation and coupling circuit of claim 7,
the resistance values of the resistors contained in the first passive trap and the second passive trap are 11.8K omega, the resistance values of the resistors contained in the third passive trap are 7.15K omega, the capacitance values of the capacitors contained in the first passive trap are 270nF, and the capacitance values of the capacitors contained in the second passive trap and the third passive trap are 91 nF.
10. The isolation and coupling circuit of claim 2,
the piezoresistor is CNR-14D 561K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120437636.8U CN214959491U (en) | 2021-03-01 | 2021-03-01 | Isolation and coupling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120437636.8U CN214959491U (en) | 2021-03-01 | 2021-03-01 | Isolation and coupling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214959491U true CN214959491U (en) | 2021-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120437636.8U Active CN214959491U (en) | 2021-03-01 | 2021-03-01 | Isolation and coupling circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN214959491U (en) |
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2021
- 2021-03-01 CN CN202120437636.8U patent/CN214959491U/en active Active
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