Power supply control circuit and display device

Patent metadata

Field	Value
Publication number	US-11670208-B2
Application number	US-202117485438-A
Country	US
Kind code	B2
Filing date	Sep 26, 2021
Priority date	Sep 6, 2019
Publication date	Jun 6, 2023
Grant date	Jun 6, 2023

Abstract

Disclosed are a power supply control circuit and a display device. An output terminal of the power factor correction circuit is connected to the resonance circuit; a first output terminal of the resonance circuit is connected to the backlight module through the first rectification filter circuit, and a second output terminal of the resonance circuit is connected to the control circuit board and the communication circuit through the second rectification filter circuit; a third output terminal of the resonance circuit is connected to the control system and the communication circuit; the control circuit board is connected to the control system through the communication circuit; a first signal output terminal of the control system is connected to the power factor correction circuit; and a second signal output terminal of the control system is connected to the resonance circuit.

First claim

What is claimed is:

1. A power supply control circuit, applied to a display device comprising a control circuit board and a backlight module, wherein the power supply control circuit comprises a power factor correction circuit, a resonance circuit, a first rectification filter circuit, a second rectification filter circuit, a communication circuit and a control system;
an output terminal of the power factor correction circuit is connected to an input terminal of the resonance circuit; a first output terminal of the resonance circuit is connected to a power input terminal of the backlight module through the first rectification filter circuit, a second output terminal of the resonance circuit is connected to a power input terminal of the control circuit board through the second rectification filter circuit, and the second output terminal of the resonance circuit is connected to a second power input terminal of the communication circuit through the second rectification filter circuit; a third output terminal of the resonance circuit is connected to a power input terminal of the control system, and the third output terminal of the resonance circuit is further connected to a first power input terminal of the communication circuit; the control circuit board is in communication connection with the control system through the communication circuit; a first signal output terminal of the control system is connected to a signal input terminal of the power factor correction circuit; and a second signal output terminal of the control system is connected to a signal input of the resonance circuit.

2. The power supply control circuit of claim 1 , wherein the power supply control circuit further comprises a feedback circuit, a first input terminal of the feedback circuit is connected to an output terminal of the first rectification filter circuit, a second input terminal of the feedback circuit is connected to an output terminal of the second rectification filter circuit, and an output terminal of the feedback circuit is connected to a feedback terminal of the control system.

3. The power supply control circuit of claim 2 , wherein the communication circuit comprises a first voltage conversion circuit, a second voltage conversion circuit, a control chip, a first resistor, a second resistor, a third resistor, and a fourth resistor;
an input terminal of the first voltage conversion circuit is connected to the third output terminal of the resonance circuit, and a first output terminal of the first voltage conversion circuit is connected to a primary power supply terminal of the control chip; an input terminal of the second voltage conversion circuit is connected to the output terminal of the second rectification filter circuit, and a first output terminal of the second voltage conversion circuit is connected to a secondary power supply terminal of the control chip;
a primary data line of the control chip is connected to a first signal input terminal of the control system, and a primary clock line of the control chip is connected to a second signal input terminal of the control system; a secondary data line of the control chip is connected to a first signal output terminal of the control circuit board, and a secondary clock line of the control chip is connected to a second signal output terminal of the control circuit board; a first terminal of the first resistor is connected to a second output terminal of the second voltage conversion circuit, and a second terminal of the first resistor is connected to the secondary data line of the control chip; a first terminal of the second resistor is connected to the second output terminal of the second voltage conversion circuit, and a second terminal of the second resistor is connected to the secondary clock line of the control chip; and
a first terminal of the third resistor is connected to a second output terminal of the first voltage conversion circuit, and a second terminal of the third resistor is connected to the primary data line of the control chip; and a first terminal of the fourth resistor is connected to the second output terminal of the first voltage conversion circuit, and a second terminal of the fourth resistor is connected to the primary clock line of the control chip.

4. The power supply control circuit of claim 3 , wherein the power supply control circuit further comprises a serial bus interface socket, a first pin of the serial bus interface socket is grounded, a second pin of the serial bus interface socket is connected to the secondary clock line of the control chip, and a third pin of the serial bus interface socket is connected to the secondary data line of the control chip.

5. The power supply control circuit of claim 1 , wherein the resonance circuit comprises a fifth resistor, a sixth resistor, a first electronic switch, a second electronic switch, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a diode, and a transformer;
a controlled terminal of the first electronic switch is connected to a first control terminal of the control system through the fifth resistor, an input terminal of the first electronic switch is connected to the output terminal of the power factor correction circuit, and an output terminal of the first electronic switch is connected to an input terminal of the second electronic switch; a controlled terminal of the second electronic switch is connected to a second control terminal of the control system through the sixth resistor, and an output terminal of the second electronic switch is grounded;
a dotted terminal of a first primary coil of the transformer is connected to the output terminal of the first electronic switch, the dotted terminal of the first primary coil of the transformer is further connected to the second signal output terminal of the control system, a non-dotted terminal of the first primary coil of the transformer is connected to a current detection terminal of the control system through the second capacitor, one terminal of the first capacitor is connected to the non-dotted terminal of the first primary coil of the transformer, and the other terminal of the first capacitor is grounded; a dotted terminal of a second primary coil of the transformer is connected to a positive electrode of the diode, and a negative electrode of the diode is connected to the power input terminal of the control system; a non-dotted terminal of the second primary coil of the transformer is grounded; one terminal of the third capacitor is connected to the negative electrode of the diode, and the other terminal of the third capacitor is grounded; and
a first secondary coil of the transformer is connected to the power input terminal of the backlight module through the first rectification filter circuit, and a second secondary coil of the transformer is connected to the power input terminal of the control circuit board through the second rectification filter circuit.

6. The power supply control circuit of claim 1 , wherein the power supply control circuit further comprises an electromagnetic interference (EMI) filter circuit and a rectification circuit, an input terminal of the EMI filter circuit is connected to an output terminal of an alternating current (AC) power supply, an output terminal of the EMI filter circuit is connected to an input terminal of the rectification circuit, and an output terminal of the rectification circuit is connected to an input terminal of the power factor correction circuit.

7. The power supply control circuit of claim 6 , wherein the power supply control circuit further comprises a voltage division detection circuit, an input terminal of the voltage division detection circuit is connected to the output terminal of the EMI filter circuit, and an output terminal of the voltage d

Assignees

• Shenzhen Skyworth Rgb Electronics Co Ltd

Inventors

• Hu Xiangfeng
• Bao Xiaojie
• Pan Qiaofu
• Li Yawei
• Huang Deqiang

Classifications

• Y02B70/10

  Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes · CPC title

• H02M1/4208

  Arrangements for improving power factor of AC input · CPC title

• H02M3/33571

  Half-bridge at primary side of an isolation transformer · CPC title

• H02M3/01

  Resonant DC/DC converters · CPC title

• H02M3/33561

  having more than one ouput with independent control · CPC title