Power supply circuit of mini LED television

Abstract

The utility model provides a power supply circuit of a mini LED television, and relates to the technical field of television power supplies, the power supply circuit comprises an isolation type switch power supply, a BUCK circuit and a semiconductor switch tube, the isolation type switch power supply is used for outputting a first direct current voltage, the first direct current voltage is converted into a second direct current voltage through the BUCK circuit, the second direct current voltage supplies power to a television control panel, and the semiconductor switch tube is connected with the isolation type switch power supply. The first direct-current power supply supplies power to the LED backlight unit through the semiconductor switch tube, and the on-off of the semiconductor switch tube is controlled by the television control panel to supply power to the mini LED television, so that compared with the prior art, the BUCK circuit is used for replacing an isolation power supply, the cost is reduced, the problem of high cost of a power supply circuit of the existing mini LED television is solved, and the power supply circuit of the mini LED television is suitable for popularization and application. The mini LED television power supply circuit is suitable for power supply of mini LED televisions.

Description

Technical Field

[0001] The utility model relates to the technical field of television power supplies, and in particular to a power supply circuit for a miniLED television. Background Art

[0002] The power supply circuit of a miniLED TV usually needs to provide two outputs, with typical specifications being a 12V output voltage and a continuously adjustable 22V-26.5V output voltage. The 12V output voltage is used to power the TV control board, and the continuously adjustable 22V-26.5V output voltage is used to power the LED backlight unit.

[0003] The power supply circuit of existing miniLED TVs often uses two isolated power supplies to provide a 12V output voltage and a 22V-26.5V output voltage to power the LED backlight unit. Specifically, a flyback power supply is used to provide a 12V constant-voltage DC output, and an LLC resonant or AHB asymmetric half-bridge flyback power supply is used to provide an adjustable voltage 22V-26.5V DC output to power the LED backlight unit. The use of two isolated power supplies leads to high costs. Utility Model Content

[0004] Technical problem solved by the present invention: The present invention provides a power supply circuit for a miniLED TV, which solves the problem of high cost of the power supply circuit of existing miniLED TVs.

[0005] The utility model adopts a technical solution to solve the above technical problems: the power supply circuit of the miniLED TV is used to power the TV control board and the LED backlight unit, including an isolated switching power supply, a BUCK circuit, and a semiconductor switch tube. The isolated switching power supply is used to output a first DC voltage, which is converted into a second DC voltage through the BUCK circuit. The second DC voltage powers the TV control board, and the first DC voltage powers the LED backlight unit through the semiconductor switch tube. The on and off of the semiconductor switch tube is controlled by the TV control board.

[0006] Furthermore, the first DC voltage is 22V-26.5V.

[0007] Furthermore, the second DC voltage is 12V.

[0008] Furthermore, the power supply circuit of the miniLED TV also includes a feedback regulation circuit, which is used to collect the first DC voltage, compare it with the reference voltage, obtain an error signal, and feed back the error signal to the control chip on the primary side of the isolated switching power supply to achieve precise control and continuous adjustment of the first DC voltage.

[0009] Furthermore, the reference voltage includes a regulating voltage and a base voltage.

[0010] Furthermore, the regulation voltage is provided by a television control board.

[0011] Furthermore, the reference voltage is provided by a voltage regulator on the secondary side of the isolated switching power supply.

[0012] Beneficial effects of the present invention: The present invention provides a power supply circuit for a miniLED TV, including an isolated switching power supply, a BUCK circuit and a semiconductor switch tube. The isolated power supply is used to output a first DC voltage, which is converted into a second DC voltage through the BUCK circuit. The second DC voltage supplies power to the TV control board. The first DC power supply supplies power to the LED backlight unit through the semiconductor switch tube. The on and off of the semiconductor switch tube is controlled by the TV control board to complete the power supply to the miniLED TV. Therefore, compared with the existing technology, the BUCK circuit replaces one isolated power supply, which reduces costs and solves the problem of high cost of the power supply circuit of the existing miniLED TV. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the power circuit connection relationship of a miniLED TV provided by the present invention;

[0014] Figure 2 This is a schematic diagram of the flow relationship of electrical signals in the power circuit of a miniLED TV provided by the present invention. DETAILED DESCRIPTION

[0015] MiniLED TV requires two power supply voltages, one for the TV control board and the other for the LED backlight unit. This utility model aims to solve the power supply problem of miniLED TV and provides a power supply circuit for miniLED TV. Figure 1 As shown, it includes an isolated switching power supply, a buck circuit and a semiconductor switch tube. The isolated power supply is used to output a first DC voltage, which is converted into a second DC voltage through the buck circuit. The second DC voltage supplies power to the TV control board. The first DC power supply supplies power to the LED through the semiconductor switch tube. The on and off of the semiconductor switch tube is controlled by the TV control board.

[0016] Specifically, the isolated power supply belongs to the existing technology and generally includes an input filter circuit, a rectifier circuit, a primary control circuit, a power conversion circuit, an output filter circuit, and a secondary feedback regulation circuit.

[0017] Furthermore, the first DC voltage is 22V-26.5V.

[0018] Furthermore, the second DC voltage is 12V.

[0019] Furthermore, the power supply circuit of the miniLED TV also includes a feedback regulation circuit, which is used to collect the first DC voltage and compare it with the reference voltage regulated by the TV control board to obtain an error signal, and then feed the error signal back to the control chip on the primary side of the isolated switching power supply to achieve precise control and continuous adjustment of the first DC voltage.

[0020] Furthermore, the reference voltage consists of a regulating voltage and a base voltage.

[0021] Furthermore, the regulation voltage is provided by a television control board.

[0022] Furthermore, the reference voltage is provided by a voltage stabilizing source of the secondary side of the isolated switching power supply.

[0023] Specifically, the relationship between the flow of electrical signals in the power circuit of a miniLED TV is as follows: Figure 2 As shown, the feedback signal of the feedback regulation circuit is fed back to the control chip on the primary side of the isolated switching power supply through the optocoupler, thereby achieving the purpose of isolating the primary and secondary sides of the power supply.

Claims

1. The power supply circuit of miniLED TV is used to power the TV control board and LED backlight unit, characterized in that: The device comprises an isolated switching power supply, a buck circuit, and a semiconductor switch tube. The isolated switching power supply is used to output a first DC voltage, which is converted into a second DC voltage by the buck circuit. The second DC voltage supplies power to a TV control board. The first DC voltage supplies power to an LED backlight unit via a semiconductor switch tube. The on and off of the semiconductor switch tube is controlled by the TV control board.

2. The power supply circuit of the miniLED TV according to claim 1, wherein: The first DC voltage is 22V-26.5V.

3. The power supply circuit of the miniLED TV according to claim 1, wherein: The second DC voltage is 12V.

4. The power supply circuit of the miniLED TV according to any one of claims 1 to 3, characterized in that: It also includes a feedback regulation circuit, which is used to collect the first DC voltage, compare it with the reference voltage, obtain an error signal, and feed back the error signal to the control chip on the primary side of the isolated switching power supply to achieve precise control and continuous adjustment of the first DC voltage.

5. The power supply circuit of the miniLED TV according to claim 4, characterized in that: The reference voltage includes a regulating voltage and a base voltage.

6. The power supply circuit of the miniLED TV according to claim 5, characterized in that: The regulated voltage is provided by a TV control board.

7. The power supply circuit of the miniLED TV according to claim 5, characterized in that: The reference voltage is provided by a regulated voltage source on the secondary side of the isolated switching power supply.

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