CN2790006Y - Protector for electric modulator demodulator - Google Patents
Protector for electric modulator demodulator Download PDFInfo
- Publication number
- CN2790006Y CN2790006Y CN 200520022246 CN200520022246U CN2790006Y CN 2790006 Y CN2790006 Y CN 2790006Y CN 200520022246 CN200520022246 CN 200520022246 CN 200520022246 U CN200520022246 U CN 200520022246U CN 2790006 Y CN2790006 Y CN 2790006Y
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- electric power
- ground wire
- zero line
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Abstract
The utility model relates to a protecting device for an electric power modem, which has the technical scheme that overvoltage protecting elements are arranged and in parallel connection between a phase line (L) and a zero line (N), and between the phase line (L) and a ground line (G), and between the zero line (N) and the ground line, which are on one side of incoming line of the power supply line of an upper net device of an electric power line; an overcurrent protecting element is arranged between the primary winding and the coupling capacitor of a coupling circuit in series connection. The utility model effectively solves the problems that an electric power net line forms an overvoltage which easily results from common lightning, the fault and the accident of electric power equipment, etc., the overvoltage intrudes into the upper net device of an electric power line from the coupling circuit and a power supply circuit, when the overvoltage is too high and a transient current is too large or the coupling capacitor C is broken down, an overcurrent is formed, which results in the damage of the upper net device of the electric power line, and a terminal, and even endangers the safety of a human body. The utility model provides perfect protection for the upper net device of the electric power line.
Description
Technical field
The utility model relates to the protective device of a kind of parts of electric power modem, particularly a kind of electric power modem.
Technical background
Electric power modem is the modulator-demodulator that a kind of power circuit online that is specifically designed to---utilizes existing utility power to realize the technology of transfer of data---.This technology is a transmission medium with existing public power netting twine, and Internet devices such as bridge, terminal all need use coupling circuit to couple a signal on the electric power netting twine, and from the electric power netting twine received signal.When realizing transfer of data, also will obtain the required electric energy of Internet device from the electric power netting twine by the electric power netting twine.Common thunder and lightning, the fault of power equipment and accident etc. very easily cause the power network line to form overvoltage.Overvoltage is invaded the power line communications device from coupling circuit and power circuit; served as overtension; immediate current is excessive or coupling capacitor is breakdown; also will produce overcurrent in the power line communications device; cause the damage of power line communications device and terminal; even jeopardize personal safety, therefore, it is very necessary taking anti-thunder and lightning and overvoltage protection on electric power modem.And Chinese patent 02263319.7 discloses a kind of " electric power modem interface circuit ", it comprises transformer, electric capacity and wireless signal transmission receiving circuit, wherein termination in the winding two ends of the former limit of transformer by electric capacity or be connected with the electrical network zero line or with the electrical network live wire in wherein ground connection, the ground of another termination link plate, transformer secondary winding receives phone with a kind of wireless signal transmission and is electrically connected.This technical scheme only designs at the 220V power circuit; between phase line one zero line, not only there is not overvoltage protection element; overvoltage protection element between other line not being set yet, even over-current protecting element is not set, is perfect inadequately to the safeguard measure of power line communications device.
Summary of the invention
At prior art above shortcomings part; the utility model is not only between phase line one zero line of power line inlet wire one side; and between other line, be provided with overvoltage protection element; and install over-current protecting element additional; thereby provide comparatively perfect protection to the power line communications device, its shape, structure or its are in conjunction with constituting a kind of practical new technical scheme that is suitable for.
Can realize specifically constituting of the utility model purpose: the protective device of electric power modem; comprise coupling circuit; coupling capacitor; the power line of overvoltage protection element and power line communications device; the outstanding difference of itself and prior art is: at phase line (the L)-zero line (N) of power line inlet wire one side of power line communications device; phase line (L)-ground wire (G); zero line (N)-three-way of ground wire (G) has been installed in parallel overvoltage protection element (Y) respectively, and over-current protecting element (RD) has been installed in series between the elementary winding (B) of coupling circuit and coupling capacitor (C).
In the three phase supply mode; the connected mode of overvoltage protection element (Y) is the overvoltage protection element (Y) that inserts in parallel respectively between A phase-zero line (N), between B phase-zero line (N), between C phase-zero line (N), between zero line (N)-ground wire (G); perhaps be the overvoltage protection element (Y) that inserts in parallel respectively between A phase-ground wire (G), between B phase-ground wire (G), between C phase-ground wire (G), between zero line (N)-ground wire (G), over-current protecting element (RD) is still connected and is inserted between the elementary winding (B) and coupling capacitor (C) of coupling circuit.
Overvoltage protection element (Y) adopts pressure cells such as semiconductor discharger, solid state pulse inhibitor, Zinc-oxide piezoresistor and gas discharge tube, and over-current protecting element (RD) adopts fuse or auto-instauration fuse.The utility model has solved effectively because the fault of common thunder and lightning, power equipment and accident etc. very easily cause the power network line to form overvoltage; overvoltage is invaded the power line communications device from coupling circuit and power circuit; served as overtension; immediate current is excessive or coupling capacitor is breakdown; form overcurrent; cause the damage of power line communications device and terminal, even jeopardize the situation of personal safety, thereby provide comparatively perfect safeguard measure the power line communications device.
Description of drawings
Accompanying drawing 1 is the connection diagram of the utility model in the single phase power supply net;
Accompanying drawing 2 and 3 is respectively the connection diagram of the utility model two kinds of connected modes in the three phase supply net.
---overvoltage protection element RD---over-current protecting element among the figure: Y
B---high-frequency coupling transformer C---coupling capacitor
Embodiment
Accompanying drawing 1,2 and 3 is respectively embodiment of the present utility model.
The protective device of electric power modem; comprise coupling circuit; coupling capacitor; the power line of overvoltage protection element and power line communications device; phase line (L)-zero line (N) in power line inlet wire one side of power line communications device; phase line (L)-ground wire (G); zero line (N)-three-way of ground wire (G) all has been installed in parallel the semiconductor discharger; the solid state pulse inhibitor; Zinc-oxide piezoresistor; the overvoltage protection element (Y) of pressure cells such as gas discharge tube one class, the over-current protecting element (RD) of fuse or auto-instauration fuse one class of between the elementary winding (B) of coupling circuit and coupling capacitor (C), being installed in series.
In the three phase supply mode; connected mode as overvoltage protection element among Fig. 2 (Y) is the overvoltage protection element (Y) that inserts in parallel respectively between A phase-zero line (N), between B phase-zero line (N), between C phase-zero line (N), between zero line (N)-ground wire (G); perhaps as the overvoltage protection element (Y) that inserts in parallel respectively among Fig. 3 between A phase-ground wire (G), between B phase-ground wire (G), between C phase-ground wire (G), between zero line (N)-ground wire (G), over-current protecting element (RD) still connect between the elementary winding (B) and coupling capacitor (C) of access coupling circuit.
Semiconductor discharger, solid state pulse inhibitor; Zinc-oxide piezoresistor; the overvoltage protection element of pressure cells such as gas discharge tube one class is that rated operational voltage and maximum operating voltage are when following in both end voltage; this not conducting of pressure cell; in case its both end voltage meets or exceeds the breakover voltage of element; pressure cell promptly enters conducting state; release surge current and the voltage peak at pressure cell two ends is clamped to the clamping voltage value of pressure cell selects this value usually within the ability to bear of device and device feature.Can protect like this that the power line communications device is unlikely to be damaged by overvoltage.Be overvoltage protection element as the Y1 in the accompanying drawing 1, Y2 and Y3, Y1 mainly provides the protection between phase line (L)-zero line (N), and overvoltage can suppress by it between phase line (L)-zero line (N); Y2 mainly provides the protection to phase line (L)-ground wire (G), and the overvoltage energy of phase line (L)-ground wire (G) can be released over the ground by Y2; Y3 mainly provides the protection to zero line (N)-ground wire (G), and the overvoltage energy of zero line (N)-ground wire (G) can be released over the ground by Y3;
The over-current protecting element of fuse or auto-instauration fuse one class is at overtension, and immediate current is excessive or coupling capacitor is breakdown, and when forming overcurrent, the fuse cut-out circuit that fuses immediately prevents that big electric current from continuing to pass through, and plays the overcurrent protection effect.
This device should be installed in power line inlet wire one side of power line communications device, also can be installed in electric socket, and becoming individual components in the conversion socket provides, as the power line communications device or contain microcomputer etc. at interior outer protection annex.
Claims (3)
1, the protective device of electric power modem; the power line that comprises coupling circuit, coupling capacitor, overvoltage protection element and power line communications device; it is characterized in that: at phase line (the L)-zero line (N) of power line inlet wire one side of power line communications device; phase line (L)-ground wire (G); zero line (N)-three-way of ground wire (G) has been installed in parallel overvoltage protection element (Y) respectively, and over-current protecting element (RD) has been installed in series between the elementary winding (B) of coupling circuit and coupling capacitor (C).
2, the protective device of electric power modem according to claim 1, it is characterized in that: in the three phase supply mode, the connected mode of overvoltage protection element (Y) is the overvoltage protection element (Y) that inserts in parallel respectively between A phase-zero line (N), between B phase-zero line (N), between C phase-zero line (N), between zero line (N)-ground wire (G); Perhaps be the overvoltage protection element (Y) that inserts in parallel respectively between A phase-ground wire (G), between B phase-ground wire (G), between C phase-ground wire (G), between zero line (N)-ground wire (G), over-current protecting element (RD) is still contacted and is inserted between the elementary winding (B) and coupling capacitor (C) of coupling circuit.
3, according to the protective device of claim 1 and 2 described electric power modems; it is characterized in that: the available semiconductor discharger of overvoltage protection element (Y), solid state pulse inhibitor, Zinc-oxide piezoresistor; gas discharge tube, available fuse of over-current protecting element (RD) or auto-instauration fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520022246 CN2790006Y (en) | 2005-02-02 | 2005-02-02 | Protector for electric modulator demodulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520022246 CN2790006Y (en) | 2005-02-02 | 2005-02-02 | Protector for electric modulator demodulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2790006Y true CN2790006Y (en) | 2006-06-21 |
Family
ID=36790338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520022246 Expired - Fee Related CN2790006Y (en) | 2005-02-02 | 2005-02-02 | Protector for electric modulator demodulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2790006Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101563823A (en) * | 2006-11-20 | 2009-10-21 | Adc电信公司 | Fuse and breaker alarm device and method using a finite state machine |
| CN102005752A (en) * | 2010-10-22 | 2011-04-06 | 深圳市伟创电气有限公司 | Surge absorption device |
| CN105958458A (en) * | 2016-06-07 | 2016-09-21 | 杭州世永电力科技有限公司 | Three-phase power signal sharing surge protector |
-
2005
- 2005-02-02 CN CN 200520022246 patent/CN2790006Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101563823A (en) * | 2006-11-20 | 2009-10-21 | Adc电信公司 | Fuse and breaker alarm device and method using a finite state machine |
| CN102005752A (en) * | 2010-10-22 | 2011-04-06 | 深圳市伟创电气有限公司 | Surge absorption device |
| CN105958458A (en) * | 2016-06-07 | 2016-09-21 | 杭州世永电力科技有限公司 | Three-phase power signal sharing surge protector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |