CN211909239U - Power supply circuit for television indicator lamp - Google Patents
Power supply circuit for television indicator lamp Download PDFInfo
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- CN211909239U CN211909239U CN202021024891.1U CN202021024891U CN211909239U CN 211909239 U CN211909239 U CN 211909239U CN 202021024891 U CN202021024891 U CN 202021024891U CN 211909239 U CN211909239 U CN 211909239U
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Abstract
The utility model relates to the technical field of circuit, the utility model discloses aim at solving the problem that the TV pilot lamp scintillation appears after current TV shuts down, provide a power supply circuit for TV pilot lamp, including power module and secondary power supply circuit, power module's output and secondary power supply circuit's input are connected, secondary power supply circuit's output and TV pilot lamp are connected, still include: the output end of the power supply module is sequentially connected with the rectifying circuit, the voltage dividing circuit, the switch circuit and the bleeder circuit, and the bleeder circuit is connected with the output end of the secondary power supply circuit. When the television is turned off, namely the power module stops outputting alternating current, the residual voltage in the secondary power circuit is released by the release circuit, so that the power supply voltage of the television indicator lamp is quickly reduced, the problem of indicator lamp flickering after the television is turned off is avoided, the user experience is improved, and the LED television is suitable for the LED television.
Description
Technical Field
The utility model relates to a circuit technical field relates to a power supply circuit particularly.
Background
With the increase of consumer consumption level and the transformation of consumer aesthetic concept, various intelligent household appliances have entered into thousands of households. The LED television is still listed as the first intelligent household appliance as an audio and video medium.
The LED television indicating lamp is used for indicating the working state of the LED television, the indicating lamp displays red color during standby, the red indicating lamp flickers continuously in the starting process, the LED television normally works after being started, the indicating lamp displays green color, after a user presses a shutdown key to shut down the television, the internal power supply module stops outputting alternating voltage, and the green indicating lamp flickers for several seconds and then is finally turned off. At present, a power supply module supplies power to a television indicator lamp through a secondary power supply circuit, the interior of the secondary power supply circuit often needs to meet the requirements of filtering power supply by adding an inductor, a capacitor, a magnetic bead, a resistor and the like, and strict output voltage ripple requirements must be met by adding a large secondary capacitor. However, at the moment when the television is turned off, i.e., the alternating current input is cut off, a certain voltage remains in the secondary power circuit, so that the power supply voltage of the television indicator lamp is slowly reduced, the television indicator lamp is caused to flicker continuously, and the user experience is poor.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving and have among the current secondary power supply circuit that residual voltage leads to the problem that the TV pilot lamp scintillation appears after the TV shuts down, provide a power supply circuit for TV pilot lamp.
The utility model provides a technical scheme that above-mentioned technical problem adopted is: a power supply circuit for TV pilot lamp, including power module and secondary power supply circuit, power module's output is connected with secondary power supply circuit's input, secondary power supply circuit's output is connected with the TV pilot lamp, still includes: the output end of the power supply module is sequentially connected with the rectifying circuit, the voltage dividing circuit, the switch circuit and the bleeder circuit, and the bleeder circuit is connected with the output end of the secondary power supply circuit.
Further, the rectifier circuit includes: the power supply comprises a first diode and a second diode, a live wire of the output end of the power supply module is connected with the anode of the first diode, a zero line of the output end of the power supply module is connected with the anode of the second diode, and the cathode of the first diode and the cathode of the second diode are respectively connected with a voltage division circuit.
Further, the voltage dividing circuit includes: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor, wherein one end of the first resistor is connected with the negative electrode of a first diode, one end of the second resistor is connected with the negative electrode of a second diode, the other end of the first resistor is connected with the other end of the second resistor and one end of the third resistor respectively, the other end of the third resistor is connected with one end of the fifth resistor through the fourth resistor, the other end of the fifth resistor is connected with one end of the sixth resistor and a switch circuit respectively, and the other end of the sixth resistor is connected with the switch circuit and grounded.
Further, the switching circuit includes: the high-level input port is connected with a collector electrode of the first triode sequentially through a seventh resistor and a primary electrode of the optocoupler, a base electrode of the first triode is connected with the other end of the fifth resistor, and an emitting electrode of the first triode is connected with the other end of the sixth resistor.
Further, the bleeding circuit includes: the high-voltage switch comprises an eighth resistor, a ninth resistor, a tenth resistor, a capacitor and a second triode, wherein one end of the ninth resistor is connected with the base electrode of the second triode and is grounded through the secondary of the optocoupler, the other end of the ninth resistor is connected with the output end of the secondary power supply circuit and is connected with the collector electrode of the second triode through the ninth resistor, the emitting electrode of the second triode is grounded, and the tenth resistor and the capacitor are connected with the secondary of the optocoupler in parallel respectively.
Further, the secondary power supply circuit is a power supply circuit with an output voltage of 12V, and the ninth resistor is a resistor with a resistance of 100 Ω and a power of 3W.
Further, the second triode is an NPN-type triode.
The utility model has the advantages that: a power supply circuit for TV pilot lamp, in the twinkling of an eye when TV shuts down power module stops output and exchanges, the residual voltage of bleeder circuit in to secondary power supply circuit releases for the supply voltage of TV pilot lamp descends fast, has avoided the problem of pilot lamp scintillation that the TV shut down the back appears, has promoted user experience.
Drawings
Fig. 1 is a circuit diagram of a power circuit for a television indicator light according to an embodiment of the present invention;
description of reference numerals:
the output end of the L-power supply module is connected with the live wire; n-zero line of output end of power supply module; d1 — first diode; d2 — second diode; r1 — first resistance; r2 — second resistance; r3 — third resistance; r4-fourth resistor; r5-fifth resistor; r6-sixth resistance; r7 — seventh resistor; r8 — eighth resistance; r9 — ninth resistor; r10 — tenth resistance; q1-first triode; q2-second transistor; a U-optocoupler; c-capacitance; VCC-high input port.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
A power supply circuit for TV pilot lamp, including power module and secondary power supply circuit, power module's output is connected with secondary power supply circuit's input, secondary power supply circuit's output is connected with the TV pilot lamp, still includes: the output end of the power supply module is sequentially connected with the rectifying circuit, the voltage dividing circuit, the switch circuit and the bleeder circuit, and the bleeder circuit is connected with the output end of the secondary power supply circuit.
The power supply circuit of the television indicator lamp in the prior art comprises a power supply module and a secondary power supply circuit, wherein the output voltage of the power supply module generates the power supply voltage of the television indicator lamp through the secondary power supply circuit, but in order to meet the ripple requirement of the output voltage, the secondary power supply circuit usually comprises a secondary capacitor with a large resistance value, and after the power supply module stops outputting alternating voltage, the power supply voltage of the television indicator lamp is slowly reduced due to the existence of the secondary capacitor, so that the television indicator lamp continuously flickers. The utility model discloses an increase rectifier circuit, bleeder circuit, switch circuit and bleeder circuit and come to the residual voltage in the secondary power supply circuit to release for the power supply voltage of TV pilot lamp descends fast, and wherein, rectifier circuit is used for carrying out the rectification to power module's output voltage, and the bleeder module is used for carrying out the partial pressure to the voltage after the rectification, and switch circuit is used for according to the size turn-off corresponding component of the voltage of input making bleeder circuit release residual voltage.
Specifically, when the television is started up and normally works, a high level signal is input to the input end of the switching circuit, so that the corresponding element is conducted, the voltage of the bleeder circuit is not discharged, and the television indicator lamp normally works; when the television is turned off, namely the power supply module stops outputting the alternating voltage, the input end of the switch circuit inputs a low level signal, so that the corresponding element is turned off, the bleeder circuit works to bleed off the residual voltage in the secondary power supply circuit, and the power supply voltage of the television indicator lamp is quickly reduced and quickly extinguished.
Examples
The embodiment of the utility model provides a power supply circuit for TV pilot lamp, as shown in FIG. 1, rectifier circuit includes: the power supply comprises a first diode D1 and a second diode D2, wherein a live wire L of an output end of the power supply module is connected with the anode of the first diode D1, a zero line N of the output end of the power supply module is connected with the anode of the second diode D2, and the cathode of the first diode D1 and the cathode of the second diode D2 are respectively connected with a voltage division circuit.
The voltage dividing circuit includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6, wherein one end of the first resistor R1 is connected with the cathode of a first diode D1, one end of the second resistor R2 is connected with the cathode of a second diode D2, the other end of the first resistor R1 is respectively connected with the other end of the second resistor R2 and one end of the third resistor R3, the other end of the third resistor R3 is connected with one end of a fifth resistor R5 through the fourth resistor R4, the other end of the fifth resistor R5 is respectively connected with one end of the sixth resistor R6 and a switch circuit, and the other end of the sixth resistor R6 is connected with the switch circuit and grounded.
The switching circuit includes: high level input port VCC, seventh resistance R7, opto-coupler U and first triode Q1, high level input port VCC loops through the elementary and collector connection of first triode Q1 of seventh resistance R7 and opto-coupler U, the base of first triode Q1 is connected with fifth resistance R5's the other end, and first triode Q1's projecting pole is connected with sixth resistance R6's the other end.
The bleeding circuit includes: eighth resistance R8, ninth resistance R9, tenth resistance R10, electric capacity C and second triode Q2, the one end of ninth resistance R9 is connected with second triode Q2's base to through the secondary ground of opto-coupler U, the other end of ninth resistance R9 is connected with secondary power supply circuit's output, and be connected with second triode Q2's collecting electrode through ninth resistance R9, the projecting pole ground of second triode Q2, tenth resistance R10 and electric capacity C are parallelly connected with the secondary of opto-coupler U respectively.
Use below the secondary power supply circuit is 12V's power supply circuit for output voltage, ninth resistance R9 is that the resistance is 100 omega, and power is 3W's resistance, first triode Q1 and second triode Q2 are NPN type triode, power module's output voltage is 220V, high level input port VCC inputs 15V voltage as the example, and is right the utility model discloses a circuit principle explains:
when the television is started to normally work, the output voltage 220V of the power supply module generates 12V voltage through the secondary power supply circuit, and the power supply is used for supplying power to the television indicator lamp, meanwhile, the output voltage 220V of the power supply module is input to the base of the first triode Q1 in the switch circuit after being rectified by the rectifying circuit and divided by the voltage dividing circuit, the first triode Q1 is conducted, the collector of the first triode Q1 is grounded after being conducted, because the high-level input port VCC inputs a high-level signal, the primary of the optocoupler U is conducted, the photoelectric signal is emitted inside the optocoupler U, the secondary of the optocoupler U is also conducted, the secondary of the optocoupler U is conducted, the base of the second triode Q2 is grounded, the second triode Q2 is cut off, and the television indicator lamp normally supplies power and normally.
At the moment of television shutdown, namely the moment that the power supply module stops outputting the alternating voltage of 220V, the base of the first diode Q1 becomes low level, the first diode Q1 is cut off, the primary of the optocoupler U is also cut off, so that the secondary of the optocoupler U is also cut off, at the moment, the base of the second triode Q2 inputs a high level signal, the second triode Q2 is switched on, the ninth resistor R9 is used as an output dummy load of the output voltage of the secondary power supply circuit, the residual voltage in the secondary power supply circuit is released, and the power supply voltage of the visual indicator lamp is rapidly reduced and rapidly extinguished.
Claims (7)
1. A power supply circuit for TV pilot lamp, including power module and secondary power supply circuit, power module's output is connected with secondary power supply circuit's input, secondary power supply circuit's output is connected with the TV pilot lamp, its characterized in that still includes: the output end of the power supply module is sequentially connected with the rectifying circuit, the voltage dividing circuit, the switch circuit and the bleeder circuit, and the bleeder circuit is connected with the output end of the secondary power supply circuit.
2. The power supply circuit for a television indicator light of claim 1, wherein the rectifier circuit comprises: the power supply comprises a first diode and a second diode, a live wire of the output end of the power supply module is connected with the anode of the first diode, a zero line of the output end of the power supply module is connected with the anode of the second diode, and the cathode of the first diode and the cathode of the second diode are respectively connected with a voltage division circuit.
3. The power supply circuit for a television indicator light of claim 2, wherein the voltage divider circuit comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor, wherein one end of the first resistor is connected with the negative electrode of a first diode, one end of the second resistor is connected with the negative electrode of a second diode, the other end of the first resistor is connected with the other end of the second resistor and one end of the third resistor respectively, the other end of the third resistor is connected with one end of the fifth resistor through the fourth resistor, the other end of the fifth resistor is connected with one end of the sixth resistor and a switch circuit respectively, and the other end of the sixth resistor is connected with the switch circuit and grounded.
4. The power supply circuit for a television indicator light of claim 3, wherein the switching circuit comprises: the high-level input port is connected with a collector electrode of the first triode sequentially through a seventh resistor and a primary electrode of the optocoupler, a base electrode of the first triode is connected with the other end of the fifth resistor, and an emitting electrode of the first triode is connected with the other end of the sixth resistor.
5. The power supply circuit for a television indicator lamp of claim 4, wherein the bleed circuit comprises: the high-voltage switch comprises an eighth resistor, a ninth resistor, a tenth resistor, a capacitor and a second triode, wherein one end of the ninth resistor is connected with the base electrode of the second triode and is grounded through the secondary of the optocoupler, the other end of the ninth resistor is connected with the output end of the secondary power supply circuit and is connected with the collector electrode of the second triode through the ninth resistor, the emitting electrode of the second triode is grounded, and the tenth resistor and the capacitor are connected with the secondary of the optocoupler in parallel respectively.
6. The power supply circuit for a television indicator lamp of claim 5, wherein the secondary power supply circuit is a power supply circuit with an output voltage of 12V, and the ninth resistor is a resistor with a resistance of 100 Ω and a power of 3W.
7. The power supply circuit for a television indicator light of claim 5, wherein the first transistor and the second transistor are NPN transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021024891.1U CN211909239U (en) | 2020-06-05 | 2020-06-05 | Power supply circuit for television indicator lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021024891.1U CN211909239U (en) | 2020-06-05 | 2020-06-05 | Power supply circuit for television indicator lamp |
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| CN211909239U true CN211909239U (en) | 2020-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021024891.1U Active CN211909239U (en) | 2020-06-05 | 2020-06-05 | Power supply circuit for television indicator lamp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113825283A (en) * | 2021-10-08 | 2021-12-21 | 深圳创维－Rgb电子有限公司 | Far-field voice visual indicator lamp control circuit, method and device and electronic product |
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2020
- 2020-06-05 CN CN202021024891.1U patent/CN211909239U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113825283A (en) * | 2021-10-08 | 2021-12-21 | 深圳创维－Rgb电子有限公司 | Far-field voice visual indicator lamp control circuit, method and device and electronic product |
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