CN2257424Y - Telecontrol colour TV protector - Google Patents
Telecontrol colour TV protector Download PDFInfo
- Publication number
- CN2257424Y CN2257424Y CN 96206748 CN96206748U CN2257424Y CN 2257424 Y CN2257424 Y CN 2257424Y CN 96206748 CN96206748 CN 96206748 CN 96206748 U CN96206748 U CN 96206748U CN 2257424 Y CN2257424 Y CN 2257424Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- utmost point
- protector
- reset switch
- colour
- 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 special protector for a telecontrol colour TV, which comprises a power supply circuit, an automatic reset switch circuit, a load current sampling circuit, an over-voltage sampling circuit and a control circuit. The device can automatically cut off an AC power supply after a TV is turned off through telecontrol; when fault phase exceeds voltage, the self AC power supply of the protector is linked to be cut off, automatically locked, etc. Thereby, certain defects of the telecontrol colour TV are compensated. The device has the advantages of simple circuits, and damage prevention. The utility model is suitable for the broad countryside families which have unsteady voltage.
Description
The utility model relates to a kind of electronic protection device, specifically a kind of protector for household electrical appliances.
Commercially available protector for household electrical appliances is usually used in the overvoltage or the instant cut-off protection of refrigerator at present.Include one in the protector for the protector circuit provides the power circuit of direct voltage, one according to mains voltage variations and the control circuit of conducting or turn-off protection device, and several parts such as voltage sample, comparison circuit and delay circuit.Its major function one is when supply voltage surpasses permissible value, and main circuit power is cut off in the protector action; The 2nd, after instant cut-off took place, the work of protector delay circuit recovered to give main circuit power supply behind certain hour, and electrical appliance is resumed work.This protector is after realizing overvoltage protection, and the partial circuit of protector inside burns simultaneously, thereby can not realize the self-protection function of overvoltage.In addition, this protector not too is suitable for the particularity of television set, thereby this class protector seldom is used in the protection of television set usually.
Remote control color tv progressively enters huge numbers of families now, and can not cut off AC power owing to use a teleswitch shutdown, and the situation that causes television set to burn happens occasionally.Under the instant cut-off situation, colour kinescope is also caused certain infringement in addition.Do not sold the protector that remote control colour TV set carries out reliably protecting to these and appeared on the market and have as yet at present.
The purpose of this utility model is a kind of at the above-mentioned defective of remote control colour TV set and the remote-controlled shutdown that designs, the protective device of power failure self-locking with regard to providing, and this protector also can be realized the overvoltage self-insurance simultaneously.
The utility model is achieved in that protective device includes a power circuit that direct voltage is provided for protector, one changes and the control circuit of conducting or turn-off protection device according to mains voltage variations or load current, also include an automatic reset switch circuit, the input of its output connection control circuit is kept conducting state in the certain hour after protector is opened; A load current sample circuit, its output is connected to the automatic reset switch circuit, the variable signal of this circuit output load current; When an overvoltage sample circuit that is connected between power circuit and the control circuit, this circuit surpass fiducial value at supply voltage, send the signal that switches off control circuit.
Below in conjunction with accompanying drawing the utility model is further described.
Fig. 1 is a structured flowchart of the present utility model.
Fig. 2 is a circuit diagram of the present utility model.
In Fig. 1, this protective device is made up of several parts such as power circuit 1, automatic reset switch circuit 2, load current sample circuit 3, overvoltage sampling power supply 4 and control circuits 5, and its particular circuit configurations as shown in Figure 2.Wherein power circuit 1 is from major loop and connects the elementary of transformer B, the secondary rectifier diode D that connects of B
1, D
2After meet filter capacitor C again
1, C
2, connect three terminal regulator CW (CW then
7812), obtain 12 stable couchers and make voltage.
Automatic reset switch circuit 2 includes triode T
1, T
2, T
1The e utmost point connect the output of power circuit 1, the b utmost point passes through resistance R
1Connect power supply, through capacitor C
4Earth connection, the c utmost point is through resistance R
2Meet T
2The b utmost point, again through capacitor C
5Meet T
2The e utmost point and ground wire.T
2The c utmost point through resistance R
3Connect power supply, the c utmost point is exported and connection control circuit 5.In energized moment, 12 volts of voltages are through R
1Give C
4Charging is because of C
4Be equivalent to short circuit at first, T
1Very low level and conducting of b, give C again
5Charging.Work as C
4Charging finishes, T
1B high level and end C very
5On fill voltage pass through R
2Be added to T
2The b utmost point, make T
2Saturation conduction, T
2C utmost point output low level signal, make control circuit 5 conductings.At C
5Discharge time in (can set about 30 seconds), T
2Keep conducting.Behind discharge off, T
2End, c utmost point output high level signal turn-offs control circuit 5.So just realized automatically reseting of this switching circuit, promptly in energized and after not opening the certain hour of television set, protector recovers off state again.
Load current sample circuit 3 is series resistor R in major loop
8, from R
8The two ends lead-in wire meets rectifier D
8With filter C
7After, connecing the first utmost point of photoelectrical coupler NQ again, NQ secondary is connected to triode T in power circuit output end and the automatic reset switch circuit 2
1The c utmost point between.C in automatic reset switch circuit 2
5Interdischarge interval is turned on television set, then resistance R
8On have pressure drop to produce, this voltage becomes the first utmost point that direct voltage is added to NQ after rectification, filtering, make it luminous, inferior utmost point conducting, direct-current working volts are added to T in the switching circuit 2
2The b utmost point, make T
2Keep the saturation conduction state, and then make control circuit 5 keep conducting state, be the television set power supply.If turn-off colour TV with remote controller, then the television set operating current reduces, resistance R
8On voltage drop drop to deficiency so that the luminous tube on the photoelectrical coupler is luminous, its secondary ending, capacitor C
5Begin discharge.Through behind the setting-up time, discharge finishes, T
2End, control circuit 5 is turn-offed, can cut off the power supply of color television set automatically, play a protective role.
IC at control circuit 5
5Pin passes through resistance R
6With voltage-stabiliser tube D
5Be its predeterminated voltage, at line voltage just often, the dividing potential drop output valve of overvoltage sample circuit 4 is less than this predeterminated voltage, and IC is nonreversible.When the voltage superelevation, the dividing potential drop output valve increases, after its 5 pin voltages greater than IC, and the IC counter-rotating, 3 pin output low levels, and make T
3End.
When this protector and colour TV operate as normal, if any instant cut-off, then the relay in the protector can not resume work colour TV moment because of dead electricity disconnects its contact, thereby reaches the purpose of protection picture tube.Have a power failure during to length, also can reach the purpose of power failure self-locking.
The shared same circuit of this device remote control ac dump and overvoltage protection, circuit is simple, reliable operation, not fragile.Model machine is on probation to reach 1 year, and every defencive function all can intactly embody.In the unsettled vast rural households of operating voltage, this device will be brought into play bigger effect.
Claims (5)
1, a kind of remote control colour TV set protector; include a power circuit (1) that direct voltage is provided for protector; one changes according to mains voltage variations or load current and the control circuit (5) of conducting or turn-off protection device is characterized in that this device also has:
An automatic reset switch circuit (2), the input of its output connection control circuit (5) is kept conducting state in the certain hour after protector is opened,
A load current sample circuit (3), its output are connected to automatic reset switch circuit (2), the variable signal of output load current,
An overvoltage sample circuit (4) that is connected between power circuit (1) and the control circuit (5) when supply voltage surpasses fiducial value, sends the signal that switches off control circuit.
2, remote control colour TV set protector according to claim 1 is characterized in that automatic reset switch circuit (2) includes triode T
1, T
2, T
1The e utmost point connect power circuit output end, the b utmost point passes through resistance R
1Connect power supply, through capacitor C
4Earth connection, the c utmost point is through resistance R
2Meet T
2The b utmost point, again through capacitor C
5Meet T
2The e utmost point and ground wire, the c utmost point of T2 is through resistance R
3Connect power supply.
3, remote control colour TV set protector according to claim 1 is characterized in that load current sample circuit (3) is series resistor R in major loop
8, from R
8The two ends lead-in wire meets rectifier D
8With filter C
7After, connecing the first utmost point of photoelectrical coupler NQ again, NQ secondary is connected to triode T in power circuit output end and the automatic reset switch circuit (2)
1The c utmost point between.
4, remote control colour TV set protector according to claim 1 is characterized in that overvoltage sample circuit (4) is by two divider resistance (R
4, R
5) branch road constituting forms, and is connected between power circuit (1) and the ground wire input of tapping connection control circuit (5) in the middle of it.
5, remote control colour TV set protector according to claim 1 is characterized in that control circuit (5) is with integrated KA
555(IC) be master element, its 2 pin and 6 pin inputs are respectively through diode D
3Take over and press sample circuit (4), again through diode D
4Connect the output of automatic reset switch circuit (2), its 5 pin is connected on resistance R
6With voltage-stabiliser tube D
5The centre of branch road, its 3 pin output is connected to triode T
3The b utmost point, T
3E utmost point serial connection relay J, the contact J of relay J
1Be serially connected with on the major loop, reset switch K is connected to J
1Two ends, on major loop, also be connected to a plug and at least one socket C.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 96206748 CN2257424Y (en) | 1996-03-22 | 1996-03-22 | Telecontrol colour TV protector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 96206748 CN2257424Y (en) | 1996-03-22 | 1996-03-22 | Telecontrol colour TV protector |
Publications (1)
Publication Number | Publication Date |
---|---|
CN2257424Y true CN2257424Y (en) | 1997-07-02 |
Family
ID=33891260
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN 96206748 Expired - Fee Related CN2257424Y (en) | 1996-03-22 | 1996-03-22 | Telecontrol colour TV protector |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN2257424Y (en) |
-
1996
- 1996-03-22 CN CN 96206748 patent/CN2257424Y/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 |