CN2183062Y - Arrangement for protection of power supply of wire TV set - Google Patents
Arrangement for protection of power supply of wire TV set Download PDFInfo
- Publication number
- CN2183062Y CN2183062Y CN 93248039 CN93248039U CN2183062Y CN 2183062 Y CN2183062 Y CN 2183062Y CN 93248039 CN93248039 CN 93248039 CN 93248039 U CN93248039 U CN 93248039U CN 2183062 Y CN2183062 Y CN 2183062Y
- Authority
- CN
- China
- Prior art keywords
- power supply
- relay
- cable television
- resistance
- triode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a protection device for power supply, particularly a protection device for wind power supply of cable television. The utility model has the technical proposal that a varistor RY, a resistance-capacitance circuit, an alternating current contactor JC and a transformer B are connected with a power cord in a bridge connection mode. A secondary of the transformer is connected with a triode T in a switch circuit after rectificated so as to control the operating state of a relay J. A normally-closed contact J1 of the relay J is connected in series with an alternating current contactor coil. The utility model can prevent lightning strike and overvoltage effectively and protect cable television network equipment with the advantages of reasonable structure, safety, automatic power cutout, automatic power supply, etc.
Description
The utility model relates to a kind of power supply protection device, particularly the protective device of cable television network power supply source.
At present, cable television network is vulnerable to interference such as thunderbolt, overvoltage, and the damage equipment element influences cable television network and normally moves.Someone adopts piezo-resistance, resistance-capacitance circuit to protect, and thunderbolt is disturbed played certain protective role, but when unexpected overvoltage appears in circuit, still can not realize automatic protection, also may cause damage to cable television network equipment.
The utility model purpose provides a kind of cable television network power supply protection device, and the protection cable television appliances is without prejudice in thunderbolt, overvoltage accident, and safe operation solves the above-mentioned problems in the prior art.
Technical solutions of the utility model are: be connected across on the power line by piezo-resistance, resistance-capacitance circuit, A.C. contactor and transformer, the secondary output of transformer is connected with transistor switching circuit after rectification, triode output is connected with relay, the normally closed contact of relay is serially connected in the A.C. contactor circuit, and the normally opened contact of A.C. contactor is serially connected in the power circuit.
Adopt the utility model, when the thunderbolt high voltage interference occurring, resistance-capacitance circuit can suppress overvoltage to be impacted, and piezo-resistance is in short-circuit condition, and the electric wave that prevents to be struck by lightning is invaded, protection cable television appliances safety.When the electrical network accident that meets accident, voltage surpasses the preset upper limit value, and transformer-secondary voltage raises; the triode conducting; the relay adhesive, A.C. contactor discharges, and supply line disconnects; the protection cable television network is without prejudice; after line voltage recovered normally, triode ended, and relay discharges; the A.C. contactor adhesive, electrical network is powered again.
The utlity model has rational in infrastructure, safe and reliable, outage and characteristics such as automatic power automatically.
Accompanying drawing is the utility model embodiment electrical schematic.
Below in conjunction with accompanying drawing, further specify the utility model by embodiment.
The utility model constitutes lightning prevention circuit by piezo-resistance RY, the resistance R X, the capacitor C X that are connected across on the electrical network, when Lightning Over-voltage occurring, can suppress lightning wave, prevents to damage cable television network equipment.A.C. contactor JC and transformer B also are connected across on the electrical network, and the A.C. contactor normally opened contact is serially connected on the electrical network of back.B level output of transformer enters the base stage of triode T after the diode bridge rectification, triode T output connects relay J, and its normally closed contact J1 is serially connected on the A.C. contactor JC coil; Its normal opened contact J2 links to each other with ic chip-CS8204, and the output of IC connects loud speaker YD.When the electrical network accident that meets accident, voltage rises to predetermined limit value, and this value is determined by regulating resistance W.Transformer B secondary output voltage increases, triode T saturation conduction, and the relay J adhesive, its normally closed contact J1 opens, and A.C. contactor JC discharges, and cuts off the electricity supply; Simultaneously, the normal opened contact J2 closure of relay, IC gets electric oscillation, and loud speaker sends alarm sound.After line voltage recovered normally, triode T ended, and relay J discharges, A.C. contactor JC adhesive, electrical network normal power supply.For increasing circuit stability, improve antijamming capability, on triode T base stage, voltage-stabiliser tube WD is arranged.
Claims (3)
1, a kind of cable television network power supply protection device with piezo-resistance, resistance-capacitance circuit; its piezo-resistance and resistance-capacitance circuit are connected across on the power line; it is characterized in that transformer B and A.C. contactor JC also are connected across on the power line; the secondary output of transformer is connected with the switching circuit of triode T formation after rectification; the output of triode T is connected with relay J, the normally closed contact J1 serial connection ac contactor coil of relay.
2, the cable television network power supply protection device according to claim 1 is characterized in that the normal opened contact J2 of said relay J is connected with ic chip-CS8204, and its output connects loud speaker YD.
3,, it is characterized in that connecting on the base stage of triode T in the switching circuit voltage-stabiliser tube WD according to claim 1 or 2 described cable television network power supply protection devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93248039 CN2183062Y (en) | 1993-12-22 | 1993-12-22 | Arrangement for protection of power supply of wire TV set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93248039 CN2183062Y (en) | 1993-12-22 | 1993-12-22 | Arrangement for protection of power supply of wire TV set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2183062Y true CN2183062Y (en) | 1994-11-16 |
Family
ID=33820295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93248039 Expired - Fee Related CN2183062Y (en) | 1993-12-22 | 1993-12-22 | Arrangement for protection of power supply of wire TV set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2183062Y (en) |
-
1993
- 1993-12-22 CN CN 93248039 patent/CN2183062Y/en not_active Expired - Fee Related
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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 |