CN105959600B - Circuit for quickly turning off TV indicator lamp after power failure and television - Google Patents
Circuit for quickly turning off TV indicator lamp after power failure and television Download PDFInfo
- Publication number
- CN105959600B CN105959600B CN201610495603.2A CN201610495603A CN105959600B CN 105959600 B CN105959600 B CN 105959600B CN 201610495603 A CN201610495603 A CN 201610495603A CN 105959600 B CN105959600 B CN 105959600B
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- triode
- resistor
- inductor
- electrolytic capacitor
- indicator lamp
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
The invention belongs to the technical field of power supply control, and particularly relates to a circuit for quickly turning off a TV indicator lamp after power failure and a television. In the invention, the circuit for quickly turning off the TV indicator lamp after power failure is provided with the unit for quickly turning off the TV indicator lamp, and after the power failure of the TV set, the unit for quickly turning off the TV indicator lamp discharges an electrolytic capacitor in a direct current output unit, so that the TV indicator lamp can be quickly turned off, and the problem that the existing TV indicator lamp is aged due to long-time work is solved.
Description
Technical Field
The invention belongs to the technical field of power supply control, and particularly relates to a circuit for quickly turning off a TV indicating lamp after power failure and a TV set.
Background
According to the standard given by the certification authority, the standby power consumption of the existing television is required to be below 0.5W, so the existing TV power panel can meet the design requirements by adopting a scheme with low standby power consumption, under the conditions of the design schemes, after the input power is powered off, the electric energy stored in a primary large electrolytic capacitor and a secondary output filter capacitor in the power panel cannot be released instantly, so that after the alternating current is turned off, the indicator lamp on the television can be continuously lightened for a long time, and some two models or three minutes later, the indicator lamp is lightened. Thus, the television indicating lamp can be aged due to long-time operation.
Disclosure of Invention
The embodiment of the invention aims to provide a circuit for quickly turning off a TV indicating lamp after power failure and a television, and aims to solve the problem that the existing television indicating lamp is aged due to long-time working.
The embodiment of the invention is realized in such a way that a circuit for quickly turning off a TV indicator lamp after power failure is connected with an alternating current input circuit, and the circuit for quickly turning off the TV indicator lamp after power failure comprises:
the direct current output unit is connected with the alternating current input circuit and supplies power to the TV mainboard;
and the TV indicator lamp unit is connected with the direct current output unit, discharges an electrolytic capacitor in the direct current output unit and turns off the TV indicator lamp quickly.
In the above configuration, the dc output unit includes:
the device comprises a Schottky diode D1, an electrolytic capacitor C2, an electrolytic capacitor C3 and an inductor L1;
the anode of the Schottky diode D1 is connected with the secondary coil of the transformer of the alternating current input circuit, the cathode of the Schottky diode D1 is connected with the first end of the inductor L1, the second end of the inductor L1 is connected with the TV main board and the TV indicator lamp unit which is rapidly turned off, the electrolytic capacitor C1 and the electrolytic capacitor C2 are connected between the first end of the inductor L1 and the ground in parallel, and the electrolytic capacitor C3 is connected between the second end of the inductor L1 and the ground.
In the above configuration, the TV lamp unit for quickly turning off includes:
the circuit comprises a diode D2, a resistor R1, a resistor R2, a resistor R3, a filter capacitor C4, a filter capacitor C5 and a switch tube;
the anode of the diode D2 is connected with the secondary coil of the transformer of the alternating current input circuit, the cathode of the diode D2 is connected with the first end of the resistor R1, the second end of the resistor R1 is connected with the control end of the switch tube, the resistor R2, the filter capacitor C4 and the filter capacitor C5 are connected between the control end of the switch tube and the ground in parallel, the first end of the switch tube is connected with the second end of the inductor L1 through the resistor R3, and the second end of the switch tube is grounded.
In the above structure, the switch tube includes a triode Q1 and a triode Q2, the base of the triode Q1 is the control end of the switch tube, the collector of the triode Q1 and the collector of the triode Q2 are grounded simultaneously, the emitter of the triode Q1 is connected to the base of the triode Q2, and the emitter of the triode Q2 is the first end of the switch tube.
Another object of an embodiment of the present invention is to provide a television, including a circuit for quickly turning off a TV indicator after power failure, connected to an ac input circuit, wherein the circuit for quickly turning off the TV indicator after power failure includes:
a DC output unit connected with the AC input circuit and supplying power to the TV mainboard;
and the TV indicator lamp unit is connected with the direct current output unit, discharges an electrolytic capacitor in the direct current output unit and turns off the TV indicator lamp quickly.
In the above configuration, the dc output unit includes:
the Schottky diode D1, the electrolytic capacitor C2, the electrolytic capacitor C3 and the inductor L1;
the anode of the Schottky diode D1 is connected with the secondary coil of the transformer of the alternating current input circuit, the cathode of the Schottky diode D1 is connected with the first end of the inductor L1, the second end of the inductor L1 is connected with the TV main board and the TV indicator lamp unit which is rapidly turned off, the electrolytic capacitor C1 and the electrolytic capacitor C2 are connected between the first end of the inductor L1 and the ground in parallel, and the electrolytic capacitor C3 is connected between the second end of the inductor L1 and the ground.
In the above configuration, the TV lamp unit for quickly turning off includes:
the circuit comprises a diode D2, a resistor R1, a resistor R2, a resistor R3, a filter capacitor C4, a filter capacitor C5 and a switch tube;
the anode of the diode D2 is connected with the secondary coil of the transformer of the alternating current input circuit, the cathode of the diode D2 is connected with the first end of the resistor R1, the second end of the resistor R1 is connected with the control end of the switch tube, the resistor R2, the filter capacitor C4 and the filter capacitor C5 are connected between the control end of the switch tube and the ground in parallel, the first end of the switch tube is connected with the second end of the inductor L1 through the resistor R3, and the second end of the switch tube is grounded.
In the above structure, the switch tube includes a triode Q1 and a triode Q2, the base of the triode Q1 is the control end of the switch tube, the collector of the triode Q1 and the collector of the triode Q2 are grounded simultaneously, the emitter of the triode Q1 is connected to the base of the triode Q2, and the emitter of the triode Q2 is the first end of the switch tube.
In the embodiment of the invention, the circuit for quickly turning off the TV indicator lamp after power failure is provided with the unit for quickly turning off the TV indicator lamp, and the unit for quickly turning off the TV indicator lamp discharges an electrolytic capacitor in the direct current output unit after the power failure of the television, so that the TV indicator lamp can be quickly turned off, and the problem that the existing television indicator lamp is aged due to long-time work is solved.
Drawings
Fig. 1 is a structural diagram of a circuit for quickly turning off a TV indicator lamp after power failure according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 shows a structure of a circuit for quickly turning off a TV indicator light after power failure according to an embodiment of the present invention, and for convenience of description, only the portions related to the embodiment of the present invention are shown.
A circuit for quickly turning off a TV indicator lamp after power failure is connected with an alternating current input circuit 10, and comprises:
a dc output unit 1 connected to the ac input circuit 10 and supplying power to a TV main board 20;
and the TV indicator lamp unit 2 is connected with the direct current output unit 1, discharges an electrolytic capacitor in the direct current output unit 1 and turns off a TV indicator lamp quickly.
As an embodiment of the present invention, the dc output unit 1 includes:
the device comprises a Schottky diode D1, an electrolytic capacitor C2, an electrolytic capacitor C3 and an inductor L1;
the anode of the schottky diode D1 is connected to the secondary coil of the transformer of the ac input circuit 10, the cathode of the schottky diode D1 is connected to the first end of the inductor L1, the second end of the inductor L1 is connected to the TV main board 20 and the TV indicator light unit 2 for fast turning off, the electrolytic capacitor C1 and the electrolytic capacitor C2 are connected in parallel between the first end of the inductor L1 and the ground, and the electrolytic capacitor C3 is connected between the second end of the inductor L1 and the ground.
As an embodiment of the present invention, the TV indicator light unit 2 that quickly turns off includes:
the circuit comprises a diode D2, a resistor R1, a resistor R2, a resistor R3, a filter capacitor C4, a filter capacitor C5 and a switch tube 21;
the anode of the diode D2 is connected to the secondary coil of the transformer of the ac input circuit 10, the cathode of the diode D2 is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the control end of the switching tube 21, the resistor R2, the filter capacitor C4 and the filter capacitor C5 are connected in parallel between the control end of the switching tube 21 and the ground, the first end of the switching tube 21 is connected to the second end of the inductor L1 through the resistor R3, and the second end of the switching tube 21 is grounded.
As an embodiment of the present invention, the switch tube 21 includes a transistor Q1 and a transistor Q2, a base of the transistor Q1 is a control end of the switch tube 21, a collector of the transistor Q1 and a collector of the transistor Q2 are simultaneously grounded, an emitter of the transistor Q1 is connected to the base of the transistor Q2, and an emitter of the transistor Q2 is a first end of the switch tube 21.
The embodiment of the invention also provides a television, which comprises a circuit for quickly turning off the TV indicator lamp after power failure, and is connected with the alternating current input circuit 10, wherein the circuit for quickly turning off the TV indicator lamp after power failure comprises:
a dc output unit 1 connected to the ac input circuit 10 and supplying power to a TV main board 20;
and the TV indicator lamp unit 2 is connected with the direct current output unit 1, discharges an electrolytic capacitor in the direct current output unit 1 and turns off a TV indicator lamp quickly.
As an embodiment of the present invention, the dc output unit 1 includes:
the Schottky diode D1, the electrolytic capacitor C2, the electrolytic capacitor C3 and the inductor L1;
the anode of the schottky diode D1 is connected to the secondary coil of the transformer of the ac input circuit 10, the cathode of the schottky diode D1 is connected to the first end of the inductor L1, the second end of the inductor L1 is connected to the TV main board 20 and the TV indicator light unit 2 for fast turning off, the electrolytic capacitor C1 and the electrolytic capacitor C2 are connected in parallel between the first end of the inductor L1 and the ground, and the electrolytic capacitor C3 is connected between the second end of the inductor L1 and the ground.
As an embodiment of the present invention, the TV indicator light unit 2 that quickly turns off includes:
the circuit comprises a diode D2, a resistor R1, a resistor R2, a resistor R3, a filter capacitor C4, a filter capacitor C5 and a switch tube 21;
the anode of the diode D2 is connected to the secondary coil of the transformer of the ac input circuit 10, the cathode of the diode D2 is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the control end of the switching tube 21, the resistor R2, the filter capacitor C4 and the filter capacitor C5 are connected in parallel between the control end of the switching tube 21 and the ground, the first end of the switching tube 21 is connected to the second end of the inductor L1 through the resistor R3, and the second end of the switching tube 21 is grounded.
As an embodiment of the present invention, the switch tube 21 includes a transistor Q1 and a transistor Q2, a base of the transistor Q1 is a control end of the switch tube 21, a collector of the transistor Q1 and a collector of the transistor Q2 are grounded at the same time, an emitter of the transistor Q1 is connected to the base of the transistor Q2, and an emitter of the transistor Q2 is a first end of the switch tube 21.
The working principle of the circuit for rapidly turning off the TV indicator lamp after power failure is as follows:
alternating Current (AC) is input from the AC input circuit 10, rectified and filtered by the DC output unit 1, and then outputs a stable 5V direct current to supply power to the TV mainboard 20.
Because the TV mainboard 20 is powered from the VSB 5 when in standby, and the electrolytic capacitors C1, C2 and C3 play a role in filtering when in normal operation, because the capacities of the capacitors are large, the electric energy stored in the capacitors is also large, and after the AC is powered off, the energy stored in the three capacitors is enough for the TV mainboard to work for a long time when in standby, so that the indicator lamp can work for a long time continuously, and the TV indicator lamp unit 2 is rapidly turned off at present, namely, the electric energy stored in the three electrolytic capacitors C1, C2 and C3 can be rapidly discharged after the AC is powered off, so that the purpose that the indicator lamp can be rapidly turned off due to the fact that the TV mainboard does not have the continuously maintained electric energy is achieved. The detailed working principle of the rapid discharge is as follows: the diode D2 and the Schottky D1 are connected with the secondary side of the transformer together, when the TV indicating lamp unit works normally, the D2 rectification is carried out, the resistors R1 and R2 are subjected to voltage division, the direct current of about 3V is obtained after filtering through the capacitors C4 and C5, the 3V voltage supplies power to the base electrode of the triode Q1, the triode Q1 is a PNP type triode, when the base electrode has high level voltage, the triode cannot be conducted, the emitting electrode of the Q1 is connected with the base electrode of the triode Q2, the emitting electrode is in a suspended state because the Q1 is not conductive, the Q2 is also in a cut-off state, the resistor R3 is connected with the electrolytic capacitor C1, the electrolytic capacitor C2 and the electrolytic capacitor C3, a loop cannot be formed, and the TV indicating lamp unit 2 is rapidly turned off. After the AC is powered off, the primary circuit and the DC circuit do not work because no electricity exists, the diode D2 does not work, the base voltage of the triode Q1 is converted into low level quickly, the triode Q1 is conducted, the triode Q2 is also changed into a conducting state because the base voltage is pulled down, a loop is formed when the emitting electrode of the Q2 is connected with the R3, the resistance value of the R3 is 100 ohms, and therefore discharging of the electrolytic capacitor C1, the electrolytic capacitor C2 and the electrolytic capacitor C3 is quick, and the purpose of quickly discharging the capacitor is achieved. Without the stored power on the capacitor, the TV main board 20 cannot operate, thereby solving the problem of quickly extinguishing the indicator light.
In the embodiment of the invention, the circuit for quickly turning off the TV indicator lamp after power failure is provided with the unit for quickly turning off the TV indicator lamp, and the unit for quickly turning off the TV indicator lamp discharges an electrolytic capacitor in the direct current output unit after the power failure of the television, so that the TV indicator lamp can be quickly turned off, and the problem that the existing television indicator lamp is aged due to long-time work is solved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. The utility model provides a power down after fast turn off TV pilot lamp circuit, is connected with AC input circuit, its characterized in that, power down after fast turn off TV pilot lamp circuit includes:
the direct current output unit is connected with the alternating current input circuit and supplies power to the TV mainboard;
the TV indicator lamp unit is connected with the direct current output unit, discharges an electrolytic capacitor in the direct current output unit and quickly turns off a TV indicator lamp;
wherein the quick turn-off TV lamp unit includes:
the circuit comprises a diode D2, a resistor R1, a resistor R2, a resistor R3, a filter capacitor C4, a filter capacitor C5 and a switch tube;
the anode of the diode D2 is connected to the secondary coil of the transformer of the ac input circuit, the cathode of the diode D2 is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the control end of the switching tube, the resistor R2, the filter capacitor C4 and the filter capacitor C5 are connected in parallel between the control end of the switching tube and ground, the first end of the switching tube is connected to the second end of the inductor L1 through the resistor R3, and the second end of the switching tube is grounded;
the switch tube comprises a triode Q1 and a triode Q2, the base of the triode Q1 is the control end of the switch tube, the collector of the triode Q1 and the collector of the triode Q2 are grounded simultaneously, the emitter of the triode Q1 is connected with the base of the triode Q2, and the emitter of the triode Q2 is the first end of the switch tube.
2. A circuit for rapidly extinguishing a TV indicator lamp after power failure according to claim 1, wherein the dc output unit includes:
the Schottky diode D1, the electrolytic capacitor C2, the electrolytic capacitor C3 and the inductor L1;
the anode of the Schottky diode D1 is connected with a transformer secondary coil of the alternating current input circuit, the cathode of the Schottky diode D1 is connected with the first end of the inductor L1, the second end of the inductor L1 is connected with the TV mainboard and the TV indicator lamp unit capable of being turned off quickly, the electrolytic capacitor C1 and the electrolytic capacitor C2 are connected between the first end of the inductor L1 and the ground in parallel, and the electrolytic capacitor C3 is connected between the second end of the inductor L1 and the ground.
3. The utility model provides a TV set, including the TV pilot lamp circuit that extinguishes fast after the power failure, is connected with the AC input circuit, its characterized in that, the TV pilot lamp circuit that extinguishes fast after the power failure includes:
the direct current output unit is connected with the alternating current input circuit and supplies power to the TV mainboard;
the TV indicator lamp unit is connected with the direct current output unit, discharges an electrolytic capacitor in the direct current output unit and quickly turns off a TV indicator lamp;
wherein the quick-turn-off TV lamp unit includes:
the circuit comprises a diode D2, a resistor R1, a resistor R2, a resistor R3, a filter capacitor C4, a filter capacitor C5 and a switch tube;
the anode of the diode D2 is connected to the secondary coil of the transformer of the ac input circuit, the cathode of the diode D2 is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the control end of the switching tube, the resistor R2, the filter capacitor C4 and the filter capacitor C5 are connected in parallel between the control end of the switching tube and ground, the first end of the switching tube is connected to the second end of the inductor L1 through the resistor R3, and the second end of the switching tube is grounded;
the switch tube comprises a triode Q1 and a triode Q2, the base of the triode Q1 is the control end of the switch tube, the collector of the triode Q1 and the collector of the triode Q2 are grounded simultaneously, the emitter of the triode Q1 is connected with the base of the triode Q2, and the emitter of the triode Q2 is the first end of the switch tube.
4. The television set according to claim 3, wherein the direct current output unit includes:
the device comprises a Schottky diode D1, an electrolytic capacitor C2, an electrolytic capacitor C3 and an inductor L1;
the anode of the Schottky diode D1 is connected with the secondary coil of the transformer of the alternating current input circuit, the cathode of the Schottky diode D1 is connected with the first end of the inductor L1, the second end of the inductor L1 is connected with the TV main board and the TV indicator lamp unit which is rapidly turned off, the electrolytic capacitor C1 and the electrolytic capacitor C2 are connected between the first end of the inductor L1 and the ground in parallel, and the electrolytic capacitor C3 is connected between the second end of the inductor L1 and the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610495603.2A CN105959600B (en) | 2016-06-29 | 2016-06-29 | Circuit for quickly turning off TV indicator lamp after power failure and television |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610495603.2A CN105959600B (en) | 2016-06-29 | 2016-06-29 | Circuit for quickly turning off TV indicator lamp after power failure and television |
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| CN105959600A CN105959600A (en) | 2016-09-21 |
| CN105959600B true CN105959600B (en) | 2023-04-07 |
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| CN201610495603.2A Active CN105959600B (en) | 2016-06-29 | 2016-06-29 | Circuit for quickly turning off TV indicator lamp after power failure and television |
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| CN105959600A (en) | 2016-09-21 |
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