CN2662568Y - Automatic switching demagnetization and overcurrent attack proof protection apparatus for color TV - Google Patents
Automatic switching demagnetization and overcurrent attack proof protection apparatus for color TV Download PDFInfo
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- CN2662568Y CN2662568Y CN 200320114444 CN200320114444U CN2662568Y CN 2662568 Y CN2662568 Y CN 2662568Y CN 200320114444 CN200320114444 CN 200320114444 CN 200320114444 U CN200320114444 U CN 200320114444U CN 2662568 Y CN2662568 Y CN 2662568Y
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Abstract
The utility model discloses a demagnetizing and overcurrent impact protection device comprising a demagnetizing circuit(1), an electric network incoming line current limit resistance(R20) as well as an automatic switching circuit. The automatic switching circuit comprises at least three junctions, with one connecting with the intake of an electric network, another connecting with a contact(P1) of the demagnetizing circuit(1) and the left one connecting with a short-circuit contact(P2) of the electric network incoming line current limit resistance(R20). The automatic switching circuit works by connecting the electric network incoming line current limit resistance(R20) and the demagnetizing circuit(1) at the time of the very starting or the power failure of a complete machine and realizing a short-circuit of the electric network incoming line current limit resistance(R20) after finishing of the starting or the finishing of demagnetizing to make the electric network incoming line current limit resistance(R20) lose the role of current limiting and simultaneously disconnecting the demagnetizing circuit(1) which has finished the course of demagnetizing.
Description
Technical field
The utility model relates generally to a kind of demagnetization overcurrent impact protection device of holding concurrently, particularly a kind of double overcurrent impact protection device that prevents of automatic switchover demagnetization that is used for colour TV.
Background technology
In the prior art, colour TV is if stand-by power consumption less than 3W, often adopts standby power and main power source to separate scheme, so cost is expensive.The now normal operate as normal switching power supply standby power function scheme of holding concurrently that adopts can reduce cost.The standby power function but prior art colour TV Switching Power Supply is held concurrently, the complete machine stand-by power consumption is bigger, generally greater than 5W.Causing the big reason of colour TV complete machine stand-by power consumption is that colour TV all has automatic degaussing circuit, and wherein, though three end field-discharge resistances are better than two end field-discharge resistance erasure effects, when electrical network was higher than 230V, this resistance power consumption was just much larger than 2W.Other any circuit power consumption can be also little under holding state.So it is to reduce colour TV holding state power consumption basis that colour TV will be set up the automatic switchover degaussing circuit.The prior art automatic degaussing circuit is realized by simple serial connection semistor usually; Its principle is, because the thermal effect of electric current sharply rises the temperature of field-discharge resistance, after temperature reached Curie point, its resistance sharply rose, and made the demagnetization loop be open-circuit condition, and field-discharge resistance has played an on-off action in the demagnetization loop; In power connection moment, this " switch " closure makes the demagnetization loop to the colour TV demagnetization, and demagnetization finishes, and " switch " disconnects, and the demagnetization loop is quit work.In above-mentioned " switch " disconnection, when the demagnetization loop quits work, the aftercurrent of still having an appointment on the PTC resistance about 10mA exists, the effect of this electric current can make keeps certain temperature (so colour TV in the course of the work on the field-discharge resistance, the field-discharge resistance surface temperature is higher), under this temperature, could keep its high value.Therefore the failure rate of field-discharge resistance is also higher.
There is interference in the demagnetization loop to other circuit, so some manufacturer is connected in series a single-pole single-throw(SPST bit switch relay again in original autodegauss loop, connect the autodegauss loop after reaching the starting up, after finishing, demagnetization cuts off the autodegauss loop again, contact required very highly when this scheme required actuating of relay, and the maximum electric current of make-and-break ability of switching should reach 20A, and this pulling relay coil is in cold movement, switch contact is in hot movement, requires very high to dielectric voltage withstand.So this single-pole single-throw(SPST position relay cost is expensive.Large-screen color TV all has been connected in series fixed resistance value high-power resistance or negative tempperature coefficient thermistor from the direct current rectifying and wave filtering circuit of electrical network, the surge impact electric current is to rectifier or filter harm when alleviating the starting up, this current-limiting resistance electric current produces voltage drop after the operate as normal has interference to other circuit, and the heating effect of current power consumption is very big, some manufacturers adopts single-pole single-throw(SPST bit switch relay to make this current-limiting resistance of short circuit in parallel after the operate as normal, have energy-conservation noiseless advantage, but also increased cost.
Single-pole single-throw(SPST bit switch relay always cuts off the power supply or starting up's access failure autodegauss loop, and just of short duration connection cold conditions demagnetization loop so the switch current rate of change is very big between the actuating of relay, have the arcing of overcoming phenomenon must increase cost after the startup.And this pulling relay coil is in cold movement, and switch contact is in hot movement, requires very high to dielectric voltage withstand.Prior art relay interlock circuit is complicated in addition, element is many.Colour TV such as Sony, Skyworth is just double-throw contact when demagnetization, so about circuit should need the switch current ability up to 20A.
Summary of the invention
For overcoming the deficiencies in the prior art part, the utility model provides a kind of effective reduction stand-by power consumption, reduces the field-discharge resistance failure rate, reduces and disturbs, and realizes the lower demagnetization of the cost overcurrent protective device of holding concurrently.
For achieving the above object, the technical scheme that the utility model is taked is: the double overcurrent impact protection device that prevents of a kind of colour TV automatic switchover demagnetization, comprise degaussing circuit 1 and electrical network inlet wire current-limiting resistance R20, also comprise an automatic switch-over circuit, described automatic switch-over circuit comprises three contacts at least, one of them contact end of incoming cables that gets access to grid, another meets degaussing circuit 1 contact P1, the 3rd the inlet wire current-limiting resistance R20 short circuit contact P2 that gets access to grid; The function of described automatic switch-over circuit is, when just starting up, connect described electrical network inlet wire current-limiting resistance R20 and degaussing circuit 1, after the starting up finishes back or complete machine outage, short circuit electrical network inlet wire current-limiting resistance R20 makes it to lose metering function, the degaussing circuit 1 after cutting off demagnetization simultaneously and finishing.
Above-mentioned automatic switch-over circuit comprises relay K B, described relay K B band single-pole double throw bit switch; Its hilted broadsword O end of incoming cables that gets access to grid, when complete machine outage or starting up, relay K B hilted broadsword O resets without exception and connects degaussing circuit 1 contact P1, connects described electrical network inlet wire current-limiting resistance R20 and degaussing circuit 1; After the starting up finished and demagnetization finishes, described relay K B hilted broadsword O set connected described electrical network inlet wire current-limiting resistance R20 short circuit contact P2, and the described current-limiting resistance R20 of short circuit cuts off the degaussing circuit 1 after demagnetization finishes simultaneously.
Above-mentioned automatic switch-over circuit can be placed the hot base plate that involves with AC network entirely.
Above-mentioned automatic switch-over circuit also comprises control relay circuit 3, is connected with the pull-in winding of described relay K B.
Above-mentioned control relay circuit 3 comprises relay tube VKB, preposition pipe V5, resistance R 7, capacitor C 46, resistance R 46; Described relay tube VKB, preposition pipe V5 constitute special-shaped multiple tube, described relay tube VKB collector electrode is connected with described relay K B pull-in winding, described resistance R 7 one ends are connected with described relay tube VKB collector electrode, and the other end is connected with described preposition pipe V5 base stage, constitute self-locking positive feedback network; Described relay tube VKB grounded emitter; Described capacitor C 46, resistance R 46 are parallel between the base stage and ground of described relay tube VKB.
Above-mentioned control relay circuit 3 can also be substituted by the circuit that comprises thyristor SCR, capacitor C 46, resistance R 46; Described capacitor C 46, resistance R 46 are parallel between the described thyristor SCR control utmost point and the ground, described thyristor SCR minus earth, and anode connects described relay K B pull-in winding.
Above-mentioned automatic switch-over circuit also comprises moment overcurrent turning circuit 2, and bypass is in described relay K B pull-in winding; Moment, overcurrent turning circuit 2 comprised resistance R 619 and acceleration switch capacitor C 618; The two parallel connection.
Between described degaussing circuit 1 and electrical network inlet wire, be serially connected with retardation coil L1, between described electrical network inlet wire current-limiting resistance R20 and electrical network inlet wire, be serially connected with retardation coil L2.
Above-mentioned retardation coil L1, L2 are the pure self-inductors of no power frequency mutual inductance.
Realization by technique scheme, the utility model has been connected and the demagnetization function that finished after start, before the action of relay coil energising adhesive contact, under the hot high resistant demagnetization circuit environment, make actuating of relay switch current rate of change very little, so to relay in requisition for when action the contact switching capability require lowlyer, can reduce cost or improve reliability.Even adopt switch current 12A single-pole double throw position relay, the relay coil power consumption is also less than 0.36W/12V (0.24W/9V) watt.And work back bypass short circuit current-limiting resistance had both prevented that the overcurrent of electrical network inlet wire current from impacting, and current-limiting resistance is the bigger the better when helping solving the starting up again, the smaller the better best of breed contradiction of current-limiting resistance during operate as normal.Its beneficial effect that brings is: 1, reduce stand-by power consumption; 2, reduce the field-discharge resistance failure rate, prolonged the useful life of resistance flowing resistance and field-discharge resistance; 3, the overcurrent that prevents to start shooting impacts the electrical network rectifier filter is endangered.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model most preferred embodiment;
Fig. 2 is the circuit theory diagrams of second embodiment of the utility model;
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is further described.
The utility model provides the circuit theory diagrams of first embodiment as shown in Figure 1; The double overcurrent impact protection device that prevents of colour TV automatic switchover demagnetization shown in Figure 1 comprises degaussing circuit 1 and electrical network inlet wire current-limiting resistance R20, and an automatic switch-over circuit; The function of this automatic switch-over circuit is, after starting up or complete machine outage, short circuit current-limiting resistance R20 makes it to lose metering function, cuts off the demagnetization back degaussing circuit 1 that finishes simultaneously.Automatic switch-over circuit described in this example comprises a single-pole double-throw switch (SPDT) relay K B, and single-pole double throw bit switch relay K B coil blackout automatically resets hilted broadsword O to be (O-P1) to connect the demagnetization loop; After demagnetization and starting up finished, relay K B coil electricity produced the magnetic force adhesive and makes hilted broadsword O set be (O-P2) end to be connected short circuit electrical network inlet wire current-limiting resistance R20 in parallel.Make it to have lost metering function, be no-resistance state, the demagnetization loop after cutting off demagnetization simultaneously and finishing.Therefore the utlity model has increases energy-conservation and reliability advantage.Electrical network inlet wire current-limiting resistance R20 resistance is that 20 Europe are above for good when complete machine outage or starting up, and current-limiting resistance R20 can select the negative tempperature coefficient thermistor replacement for use.Control relay circuit 3 comprises relay tube VKB, preposition pipe V5, resistance R 7, capacitor C 46, resistance R 46; Relay tube VKB and preposition pipe V5 form special-shaped multiple tube, constitute self-locking positive feedback network by resistance R 7 branch roads, have pulsed and switch advantage fast.Slow down in relay tube VKB conducting/shutoff handoff procedure the approach amplification region time.And there is carrying load ability strong, the little low cost and other advantages of conduction voltage drop.Relay K B and interlock circuit thereof can be placed the hot base plate that involves with AC network entirely.Resistance R 46 and capacitor C 46 etc. have anti-interference function, desirable 12V or the 15V left and right sides power supply of coming from of relay K B and interlock circuit thereof, in the relay circuit opening process, adopt pulse mode, moment overcurrent turning circuit through resistance R 619 and acceleration switch capacitor C 618 compositions produces a differential moment impact electric current, make the conducting of relay overcurrent, the suction-combining force during the firm conducting of reinforcing relay coil has just advanced to fall voltage threshold currents electricity-saving state after relay K B main contact is connected fast.After the relay coil conducting, below its both end voltage drop 9V.The utility model constitutes makes the basis of stand-by power consumption less than the least cost preferred plan of 3W.Simultaneously, also lay the first stone for reducing degaussing coil astragal footpath cost from now on and reducing electrical network rectifier filter cost.
This routine described relay K B can replace with other switches, as electronic switch, logical circuit, other automatic control circuits etc.
The electrical network inlet wire current is to the impact of circuit such as rectification, filtering when starting shooting for further reducing, be connected in series the pure self-induction retardation coil L1 that has or not the power frequency mutual inductance between degaussing circuit 1 and the electrical network inlet wire, between described electrical network inlet wire current-limiting resistance R20 and electrical network inlet wire, be connected in series the pure self-induction retardation coil L2 that has or not the power frequency mutual inductance.Both can assist current-limiting resistance R20 to reduce start and impact overcurrent harm, can suppress symmetric disturbance and asymmetric interference effect again along the power line transmitted in both directions.
Fig. 2 is the circuit theory diagrams of second embodiment of the utility model; The difference of present embodiment and the foregoing description is: described control relay circuit 3 is by comprising that the circuit that thyristor SCR, capacitor C 46, resistance R 46 constitute substitutes; Described capacitor C 46 is parallel between the described thyristor SCR control utmost point and the ground, described thyristor SCR minus earth, and anode connects described relay K B coil adhesive end.
Claims (10)
1, the double overcurrent impact protection device that prevents of a kind of colour TV automatic switchover demagnetization, comprise degaussing circuit (1) and electrical network inlet wire current-limiting resistance (R20), it is characterized in that: also comprise an automatic switch-over circuit, described automatic switch-over circuit comprises three contacts at least, one of them contact end of incoming cables that gets access to grid, another connects degaussing circuit (1) contact (P1), the 3rd inlet wire current-limiting resistance (R20) the short circuit contact (P2) that gets access to grid; The function of described automatic switch-over circuit is, when just starting up or during the complete machine outage, connect described electrical network inlet wire current-limiting resistance (R20) and degaussing circuit (1), in finish back or after demagnetization finishes of starting up, short circuit electrical network inlet wire current-limiting resistance (R20) makes it to lose metering function, the degaussing circuit (1) after cutting off demagnetization simultaneously and finishing.
2, the double overcurrent impact protection device that prevents of colour TV automatic switchover demagnetization according to claim 1, it is characterized in that: described automatic switch-over circuit comprises relay (KB), described relay (KB) band single-pole double throw bit switch; Its hilted broadsword (O) end of incoming cables that gets access to grid, when complete machine outage or starting up, relay (KB) hilted broadsword (O) resets without exception and connects degaussing circuit (1) contact (P1), connects described electrical network inlet wire current-limiting resistance (R20) and degaussing circuit (1); After the starting up finished and demagnetization finishes, described relay (KB) hilted broadsword (O) set connected described electrical network inlet wire current-limiting resistance (R20) short circuit contact (P2), and the described current-limiting resistance of short circuit (R20) cuts off the degaussing circuit (1) after demagnetization finishes simultaneously.
3, the double overcurrent impact protection device that prevents of colour TV automatic switchover demagnetization according to claim 1 and 2, it is characterized in that: described automatic switch-over circuit can be placed the hot base plate that involves with AC network entirely.
4, the double overcurrent impact protection device that prevents of colour TV automatic switchover demagnetization according to claim 1 and 2, it is characterized in that: described automatic switch-over circuit also comprises control relay circuit (3), is connected with the pull-in winding of described relay (KB).
5, the double overcurrent impact protection device that prevents of colour TV automatic switchover demagnetization according to claim 4, it is characterized in that: described control relay circuit (3) comprises relay tube (VKB), preposition pipe (V5), the 7th resistance (R7), the 46th electric capacity (C46), the 46th resistance (R46); Described relay tube (VKB), preposition pipe (V5) constitute special-shaped multiple tube, described relay tube (VKB) collector electrode is connected with described relay (KB) pull-in winding, described resistance (R7) end is connected with described relay tube (VKB) collector electrode, the other end is connected with described preposition pipe (V5) base stage, constitutes self-locking positive feedback network; Described relay tube (VKB) grounded emitter; Described electric capacity (C46), resistance (R46) are parallel between the base stage and ground of described relay tube (VKB).
6, the double overcurrent impact protection device that prevents of colour TV automatic switchover demagnetization according to claim 4, it is characterized in that: described control relay circuit (3) comprises thyristor (SCR), electric capacity (C46), resistance (R46); Described electric capacity (C46), resistance (R46) are parallel between described thyristor (SCR) the control utmost point and the ground, described thyristor (SCR) minus earth, and anode connects described relay (KB) pull-in winding.
7, the double overcurrent impact protection device that prevents of colour TV automatic switchover demagnetization according to claim 1 and 2, it is characterized in that: described automatic switch-over circuit also comprises moment overcurrent turning circuit (2), and bypass is in the pull-in winding of described relay (KB).
8, the double overcurrent impact protection device that prevents of colour TV automatic switchover demagnetization according to claim 7 is characterized in that: described moment overcurrent turning circuit (2) comprises resistance (R619) and acceleration switch electric capacity (C618); The two parallel connection.
9, the double overcurrent impact protection device that prevents of colour TV automatic switchover demagnetization according to claim 1 and 2; it is characterized in that: between described degaussing circuit (1) and electrical network inlet wire, be serially connected with retardation coil (L1), between described electrical network inlet wire current-limiting resistance (R20) and electrical network inlet wire, be serially connected with retardation coil (L2).
10, the double overcurrent impact protection device that prevents of colour TV automatic switchover demagnetization according to claim 9, it is characterized in that: described retardation coil (L1), (L2) are the pure self-inductors of no power frequency mutual inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320114444 CN2662568Y (en) | 2003-11-01 | 2003-11-01 | Automatic switching demagnetization and overcurrent attack proof protection apparatus for color TV |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320114444 CN2662568Y (en) | 2003-11-01 | 2003-11-01 | Automatic switching demagnetization and overcurrent attack proof protection apparatus for color TV |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2662568Y true CN2662568Y (en) | 2004-12-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320114444 Expired - Fee Related CN2662568Y (en) | 2003-11-01 | 2003-11-01 | Automatic switching demagnetization and overcurrent attack proof protection apparatus for color TV |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2662568Y (en) |
-
2003
- 2003-11-01 CN CN 200320114444 patent/CN2662568Y/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 | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20041208 Termination date: 20101101 |