CN214591684U - Split television power supply circuit and split television - Google Patents
Split television power supply circuit and split television Download PDFInfo
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- CN214591684U CN214591684U CN202120580959.2U CN202120580959U CN214591684U CN 214591684 U CN214591684 U CN 214591684U CN 202120580959 U CN202120580959 U CN 202120580959U CN 214591684 U CN214591684 U CN 214591684U
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Abstract
The utility model discloses a split television power supply circuit and a split television, wherein the split television power supply circuit comprises a set-top box power supply module and a display module, the display module comprises a first voltage regulating unit and a constant current plate, and the set-top box power supply module comprises a voltage output unit and a second voltage regulating unit; the constant current board is used for outputting backlight adjusting signals to the first voltage adjusting unit, the first voltage adjusting unit is used for adjusting and outputting the backlight adjusting signals output by the constant current board to the second voltage adjusting unit, and the second voltage adjusting unit is used for adjusting and outputting the backlight adjusting signals output by the first voltage adjusting unit to the voltage output unit; the voltage output unit is used for outputting the backlight adjusting signal output by the second voltage adjusting unit to a corresponding adjusting voltage to the constant current board; the utility model discloses a two components of a whole that can function independently parts at the components of a whole that can function independently TV all set up the voltage regulation part for output voltage can be controlled to two components of a whole that can function independently parts homoenergetic, thereby solves the problem that circuit short-circuit protection became invalid.
Description
Technical Field
The utility model relates to a power technical field, in particular to components of a whole that can function independently TV supply circuit and components of a whole that can function independently TV.
Background
The existing split tv comprises a split tv box and a split tv screen, wherein a power panel and a main board of the split tv are placed in the box, as shown in fig. 1, a constant current board and a T-con board are placed on the side of the split tv screen, and the box and the tv screen are connected through wires.
The constant current board outputs FB signals to the power panel through the wire, the FB signals are adjustable voltage signals of 0-2.5V, so that the output screen voltage V-LED can be adjusted within a certain range, and the corresponding screen is matched, so that the screen works normally. When the wire rod works normally, 0-2.5V adjustable signals are transmitted, the output voltage V-LED is the maximum when the voltage is 0V, and the output voltage V-LED is the minimum when the voltage is 2.5V; when the wire is short-circuited, the voltage signal transmitted by the FB signal is 0V which is not controlled by the constant current part, so that the output voltage V-LED is always kept at the maximum value, the whole circuit works in an abnormal state, a screen is easily burnt, and the short-circuit protection function of the circuit is ineffective.
Thus, the prior art has yet to be improved and enhanced.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing disadvantages of the prior art, an object of the present invention is to provide a power supply circuit for a split tv and a split tv, which can control the output voltage through two split parts of the split tv, so as to solve the problem of failure of short circuit protection.
In order to achieve the purpose, the utility model adopts the following technical proposal:
a power supply circuit of a split television comprises a set top box power supply module and a display module; the set top box power supply module comprises a voltage output unit and a second voltage regulating unit;
the constant current board is respectively connected with the first voltage regulating unit and the voltage output unit and is used for outputting backlight regulating signals to the first voltage regulating unit;
the first voltage regulating unit is connected with the second voltage regulating unit and is used for regulating and outputting the backlight regulating signal output by the constant current board to the second voltage regulating unit;
the second voltage regulating unit is connected with the voltage output unit and is used for regulating the backlight regulating signal output by the first voltage regulating unit and outputting the regulated backlight regulating signal to the voltage output unit;
the voltage output unit is used for outputting the backlight adjusting signal output by the second voltage adjusting unit to the corresponding adjusting voltage to the constant current plate.
In the split television power supply circuit, the voltage output unit comprises a sampling subunit, a comparison subunit, a feedback subunit, a control chip and a boosting subunit;
the sampling subunit is respectively connected to the second voltage adjusting unit and the comparing subunit, and is configured to sample the adjusted backlight adjustment signal output by the second voltage adjusting unit and output a sampling signal to the comparing subunit;
the comparison subunit is connected with the feedback subunit and used for comparing the sampling signal with a preset voltage signal and outputting a comparison signal to the feedback subunit;
the feedback subunit is connected with the control chip and used for outputting a feedback signal to the control chip according to the comparison signal;
the control chip is connected with the boosting subunit and used for controlling the boosting subunit to output corresponding regulated voltage according to the feedback signal.
In the split television power supply circuit, the sampling subunit comprises a first resistor and a second resistor; one end of the first resistor is connected with the boosting subunit, the other end of the first resistor is connected with one end of the second resistor, the first voltage regulating unit and the comparison subunit, and the other end of the second resistor is grounded.
In the power supply circuit of the split television, the first voltage regulating unit comprises a third resistor, one end of the third resistor is connected with the second voltage regulating unit, and the other end of the third resistor is connected with the constant current plate.
In the power supply circuit of the split television, the second voltage regulating unit comprises a fourth resistor, one end of the fourth resistor is connected with one end of the third resistor, and the other end of the fourth resistor is connected with the other end of the first resistor.
In the split television power supply circuit, the comparison subunit comprises a first capacitor, a second capacitor, a fifth resistor and a voltage stabilizing source; one end of the first capacitor is connected with the feedback subunit, the other end of the first capacitor is connected with the other end of the first resistor, one end of the second capacitor and the cathode of the voltage stabilizing source are connected with the feedback subunit, the other end of the second capacitor is connected with the other end of the first resistor through the fifth resistor, and the reference end of the voltage stabilizing source is connected with the other end of the first resistor.
In the power supply circuit of the split television, the feedback sub-unit comprises a photoelectric coupler, a sixth resistor and a seventh resistor; one end of the sixth resistor is connected with the booster unit, the other end of the sixth resistor is connected with one end of the seventh resistor and the 1 st pin of the photoelectric coupler, the other end of the seventh resistor is connected with the 2 nd pin of the photoelectric coupler and one end of the first capacitor, and the 3 rd pin and the 4 th pin of the photoelectric coupler are both connected with the control chip.
In the power supply circuit of the split television, the boosting subunit comprises a transformer and a third capacitor, a first end of a primary coil of the transformer is connected with the control chip, a second end of the primary coil of the transformer is connected with the control chip, a first end of a secondary coil of the transformer is connected with one end of the third capacitor and the constant current plate, a second end of a secondary coil of the transformer is connected with the other end of the third capacitor, and the other end of the third capacitor is grounded.
A split television comprises the power supply circuit of the split television.
Compared with the prior art, the utility model provides a split television power supply circuit and split television, split television power supply circuit includes set-top box power module and display module, and the display module includes first voltage regulating unit and constant current board, and set-top box power module includes voltage output unit and second voltage regulating unit; the constant current board is used for outputting backlight adjusting signals to the first voltage adjusting unit, the first voltage adjusting unit is used for adjusting and outputting the backlight adjusting signals output by the constant current board to the second voltage adjusting unit, and the second voltage adjusting unit is used for adjusting and outputting the backlight adjusting signals output by the first voltage adjusting unit to the voltage output unit; the voltage output unit is used for outputting the backlight adjusting signal output by the second voltage adjusting unit to a corresponding adjusting voltage to the constant current board; the utility model discloses a two components of a whole that can function independently parts at the components of a whole that can function independently TV all set up the voltage regulation part for output voltage can be controlled to two components of a whole that can function independently parts homoenergetic, thereby solves the problem that circuit short-circuit protection became invalid.
Drawings
Fig. 1 is a block diagram of an output protection circuit in a conventional switching power supply;
fig. 2 is a block diagram of an output protection circuit in the switching power supply provided by the present invention;
fig. 3 is a schematic circuit diagram of an output protection circuit in a switching power supply according to the present invention.
Detailed Description
The utility model provides a components of a whole that can function independently TV supply circuit and components of a whole that can function independently TV all sets up the voltage regulation part through two components of a whole that can function independently parts at the components of a whole that can function independently TV for output voltage can all be controlled to two components of a whole that can function independently parts, thereby solves the problem that circuit short-circuit protection became invalid.
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the following description of the present invention will refer to the accompanying drawings and illustrate embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Referring to fig. 2, the present invention provides a power supply circuit for a split tv, which includes a set-top box power supply module 10 and a display module 20, wherein the display module 20 includes a first voltage regulating unit 21 and a constant current board 22, and the set-top box power supply module 10 includes a voltage output unit 11 and a second voltage regulating unit 12; the constant current board 22 is respectively connected to the first voltage regulating unit 21 and the voltage output unit 11, and is configured to output a backlight regulating signal to the first voltage regulating unit 21; the first voltage regulating unit 21 is connected to the second voltage regulating unit 12, and is configured to regulate and output the backlight regulating signal output by the constant current board 22 to the second voltage regulating unit 12; the second voltage adjusting unit 12 is connected to the voltage output unit 11, and is configured to adjust the backlight adjusting signal output by the first voltage adjusting unit 21 and output the adjusted backlight adjusting signal to the voltage output unit 11; the voltage output unit 11 is configured to output the backlight adjustment signal output by the second voltage adjustment unit 12 to the constant current board 22 according to the adjustment voltage; this implementation is novel in all set up voltage regulation unit through the part at STB power module 10 and the part of display module 20, all right the backlight adjusting signal that constant current board 22 output adjusts, and then reaches the purpose that the regulating voltage that outputs to STB power module 10 also output voltage V-LED adjusts to can reach overvoltage protection point when the realization is in the wire rod short circuit, reach effectual guard action.
Further, the voltage output unit 11 includes a sampling subunit 111, a comparing subunit 112, a feedback subunit 113, a control chip 114 and a voltage boosting subunit 115, where the model of the control chip 114 in this embodiment is ICE2HSO1G, and of course, the control chip 114 having the same function may be selected in other embodiments, which is not limited by the present invention; the sampling sub-unit 111 is respectively connected to the second voltage adjusting unit 12 and the comparing sub-unit 112, and is configured to sample the adjusted backlight adjusting signal output by the second voltage adjusting unit 12 and output a sampling signal to the comparing sub-unit 112; the comparing subunit 112 is connected to the feedback subunit 113, and configured to compare the sampling signal with a preset voltage signal, and output a comparison signal to the feedback subunit 113; the feedback subunit 113 is connected to the control chip 114, and configured to output a feedback signal to the control chip 114 according to the comparison signal; the control chip 114 is connected to the voltage boost subunit 115, and is configured to control the voltage boost subunit 115 to output a corresponding regulated voltage to the constant current board 22 according to the feedback signal, and supply power to the constant current board 22.
Further, referring to fig. 3, the sampling subunit 111 includes a first resistor R1 and a second resistor R2; one end of the first resistor R1 is connected to the voltage boost sub-unit 115, the other end of the first resistor R1 is connected to one end of the second resistor R2, the first voltage adjustment unit 21 and the comparison sub-unit 112, the other end of the second resistor R2 is grounded, and the sampling sub-unit 111 samples the voltage of the backlight adjustment signal output by the second voltage adjustment unit 12, so as to adjust the voltage in a subsequent adjustable manner according to the output range of the backlight adjustment signal.
Further, the first voltage regulating unit 21 includes a third resistor R3, one end of the third resistor R3 is connected to the second voltage regulating unit 12, and the other end of the third resistor R3 is connected to the constant current plate 22; the third resistor R3 is an adjustable resistor, the constant current board 22 outputs a backlight adjustment signal to the first voltage adjustment unit 21, and the voltage of the backlight adjustment signal is adjusted by adjusting the resistance of the third resistor R3, so as to adjust the adjustment voltage; specifically, the third resistor R3 with different resistance values is placed for different constant current boards 22, and the output voltage, i.e., the regulated voltage, equivalent to the set-top box power supply module 10 can be controlled by the constant current board 22, so that the adaptive control of the box and the screen is realized, and the purpose of adaptive matching between the screen and the box is achieved.
Further, the second voltage regulating unit 12 includes a fourth resistor R4, one end of the fourth resistor R4 is connected to one end of the third resistor R3, and the other end of the fourth resistor R4 is connected toAt the other end of the first resistor R1, the fourth resistor R4 is a fixed resistor in this embodiment; the fourth resistor R4 in the set-top box power supply module 10 is kept at a fixed resistance, the third resistor R3 in the display module 20 is an adjustable resistor, and the sum of the resistances of the third resistor R3 and the fourth resistor R4 is equal to the resistance of the adjustable resistor arranged in the box in the prior art, that is, R0 is R3+ R4, so that the output voltage of the set-top box power supply module 10, that is, the adjustment voltage, can be controlled by the constant current board 22, and the purpose of adaptive matching between the screen and the box is achieved. At the same time, the regulated voltage, i.e. the output voltage, is present under normal operation of the circuit
Wherein VFB is the voltage output by the sampling subunit 111, and when the wire is short-circuited, the voltage is output
Output voltage of traditional circuit in short circuit
Because R2// R4 < R02, the utility model discloses output voltage can rise when the wire rod short circuit, surpasss the maximum voltage when the circuit normally works, can set up the overvoltage protection point of circuit according to this voltage. When the wire rod is in short circuit, the protection circuit responds, and the whole circuit is self-locked, so that the protection purpose is achieved.
Further, the comparison subunit 112 includes a first capacitor C1, a second capacitor C2, a fifth resistor R5, and a voltage regulator U1; one end of the first capacitor C1 is connected to the feedback subunit 113, the other end of the first capacitor C1 is connected to the other end of the first resistor R1, one end of the second capacitor C2 and the cathode of the voltage stabilization source U1 are connected to the feedback subunit 113, the other end of the second capacitor C2 is connected to the other end of the first resistor R1 through the fifth resistor R5, the reference end of the voltage stabilization source U1 is connected to the other end of the first resistor R1, and the comparison subunit 112 compares the sampling signal output by the sampling subunit 111 with a preset voltage signal, so as to adjust the whole output voltage of the set-top box power supply module 10, that is, adjust the voltage.
Further, the feedback sub-unit 113 includes a photo coupler OC1, a sixth resistor R6, and a seventh resistor R7; one end of the sixth resistor R6 is connected to the boost sub-unit 115, the other end of the sixth resistor R6 is connected to one end of the seventh resistor R7 and the 1 st pin of the photocoupler OC1, the other end of the seventh resistor R7 is connected to the 2 nd pin of the photocoupler OC1 and one end of the first capacitor C1, the 3 rd pin and the 4 th pin of the photocoupler OC1 are both connected to the control chip 114, and the feedback sub-unit 113 outputs a feedback signal to the control chip 114 according to the comparison signal output by the comparison sub-unit 112, so that the control chip 114 adjusts the output voltage.
Further, the boosting sub-unit 115 comprises a transformer T1 and a third capacitor C3, a first end of a primary coil of the transformer T1 is connected to the control chip 114, a second end of the primary coil of the transformer T1 is connected to the control chip 114, a first end of a secondary coil of the transformer T1 is connected to one end of the third capacitor C3 and the constant current board 22, a second end of a secondary coil of the transformer T1 is connected to the other end of the third capacitor C3, and the other end of the third capacitor C3 is grounded; the primary coil of the transformer T1 receives the voltage output from the control chip 114, boosts the received voltage, and outputs the boosted voltage as a regulated voltage to the constant current board 22 through the secondary coil to supply power to the constant current board 22.
The utility model also provides a components of a whole that can function independently TV, the components of a whole that can function independently TV is including components of a whole that can function independently TV supply circuit. Since the power supply circuit of the split tv has been described in detail above, it is not described here again.
To sum up, the utility model provides a split television power supply circuit and split television, split television power supply circuit include set-top box power module and display module, and the display module includes first voltage regulating unit and constant current board, and set-top box power module includes voltage output unit and second voltage regulating unit; the constant current board is used for outputting backlight adjusting signals to the first voltage adjusting unit, the first voltage adjusting unit is used for adjusting and outputting the backlight adjusting signals output by the constant current board to the second voltage adjusting unit, and the second voltage adjusting unit is used for adjusting and outputting the backlight adjusting signals output by the first voltage adjusting unit to the voltage output unit; the voltage output unit is used for outputting the backlight adjusting signal output by the second voltage adjusting unit to a corresponding adjusting voltage to the constant current board; the utility model discloses a two components of a whole that can function independently parts at the components of a whole that can function independently TV all set up the voltage regulation part for output voltage can be controlled to two components of a whole that can function independently parts homoenergetic, thereby solves the problem that circuit short-circuit protection became invalid.
It should be understood that equivalent alterations and modifications can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such alterations and modifications should fall within the scope of the appended claims.
Claims (9)
1. A power supply circuit of a split television is characterized in that the power supply circuit of the split television comprises a set top box power supply module and a display module; the set top box power supply module comprises a voltage output unit and a second voltage regulating unit;
the constant current board is respectively connected with the first voltage regulating unit and the voltage output unit and is used for outputting backlight regulating signals to the first voltage regulating unit;
the first voltage regulating unit is connected with the second voltage regulating unit and is used for regulating and outputting the backlight regulating signal output by the constant current board to the second voltage regulating unit;
the second voltage regulating unit is connected with the voltage output unit and is used for regulating the backlight regulating signal output by the first voltage regulating unit and outputting the regulated backlight regulating signal to the voltage output unit;
the voltage output unit is used for outputting the backlight adjusting signal output by the second voltage adjusting unit to the corresponding adjusting voltage to the constant current plate.
2. The split television power supply circuit according to claim 1, wherein the voltage output unit comprises a sampling subunit, a comparing subunit, a feedback subunit, a control chip and a boosting subunit;
the sampling subunit is respectively connected to the second voltage adjusting unit and the comparing subunit, and is configured to sample the adjusted backlight adjustment signal output by the second voltage adjusting unit and output a sampling signal to the comparing subunit;
the comparison subunit is connected with the feedback subunit and used for comparing the sampling signal with a preset voltage signal and outputting a comparison signal to the feedback subunit;
the feedback subunit is connected with the control chip and used for outputting a feedback signal to the control chip according to the comparison signal;
the control chip is connected with the boosting subunit and used for controlling the boosting subunit to output corresponding regulated voltage according to the feedback signal.
3. The split television supply circuit of claim 2, wherein the sampling subunit comprises a first resistor and a second resistor; one end of the first resistor is connected with the boosting subunit, the other end of the first resistor is connected with one end of the second resistor, the first voltage regulating unit and the comparison subunit, and the other end of the second resistor is grounded.
4. The power supply circuit of a split-type television as claimed in claim 3, wherein the first voltage regulating unit comprises a third resistor, one end of the third resistor is connected to the second voltage regulating unit, and the other end of the third resistor is connected to the constant current board.
5. The power supply circuit of the split-type television as claimed in claim 4, wherein the second voltage regulating unit comprises a fourth resistor, one end of the fourth resistor is connected with one end of the third resistor, and the other end of the fourth resistor is connected with the other end of the first resistor.
6. The split television power supply circuit according to claim 3, wherein the comparison subunit comprises a first capacitor, a second capacitor, a fifth resistor and a voltage regulator; one end of the first capacitor is connected with the feedback subunit, the other end of the first capacitor is connected with the other end of the first resistor, one end of the second capacitor and the cathode of the voltage stabilizing source are connected with the feedback subunit, the other end of the second capacitor is connected with the other end of the first resistor through the fifth resistor, and the reference end of the voltage stabilizing source is connected with the other end of the first resistor.
7. The split tv supply circuit according to claim 6, wherein the feedback sub-unit includes a photo coupler, a sixth resistor and a seventh resistor; one end of the sixth resistor is connected with the booster unit, the other end of the sixth resistor is connected with one end of the seventh resistor and the 1 st pin of the photoelectric coupler, the other end of the seventh resistor is connected with the 2 nd pin of the photoelectric coupler and one end of the first capacitor, and the 3 rd pin and the 4 th pin of the photoelectric coupler are both connected with the control chip.
8. The split-type television power supply circuit as claimed in claim 7, wherein the boosting sub-unit comprises a transformer and a third capacitor, a first end of a primary coil of the transformer is connected to the control chip, a second end of the primary coil of the transformer is connected to the control chip, a first end of a secondary coil of the transformer is connected to one end of the third capacitor and the constant current board, a second end of a secondary coil of the transformer is connected to the other end of the third capacitor, and the other end of the third capacitor is grounded.
9. A split tv comprising a power supply circuit for a split tv as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120580959.2U CN214591684U (en) | 2021-03-17 | 2021-03-17 | Split television power supply circuit and split television |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120580959.2U CN214591684U (en) | 2021-03-17 | 2021-03-17 | Split television power supply circuit and split television |
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| CN214591684U true CN214591684U (en) | 2021-11-02 |
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| CN202120580959.2U Active CN214591684U (en) | 2021-03-17 | 2021-03-17 | Split television power supply circuit and split television |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114664242A (en) * | 2022-04-14 | 2022-06-24 | 深圳创维－Rgb电子有限公司 | Backlight constant-current control circuit and television |
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2021
- 2021-03-17 CN CN202120580959.2U patent/CN214591684U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114664242A (en) * | 2022-04-14 | 2022-06-24 | 深圳创维－Rgb电子有限公司 | Backlight constant-current control circuit and television |
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