High-power power supply for use with display devices and associated display device

• US 10,354,570 B2
• Filed: 04/24/2017
• Issued: 07/16/2019
• Est. Priority Date: 11/18/2015
• Status: Active Grant

• Current Assignee: Skyworth Electronics Incorporated (Skyworth Group Ltd.)
• Original Assignee: Skyworth Electronics Incorporated (Skyworth Group Ltd.)
• Inventors: Cai, Shengping, Dai, Qifeng, Wei, Zongwang
• Primary Examiner(s): Danielsen, Nathan
• Application Number:
  US15/494,941
• Publication Number:
  US 20170229051A1
• Time in Patent Office: 813 Days
• CPC Class Codes: G09G 2330/025 Reduction of instantaneous peaks of current
• CPC Class Codes: G09G 2330/026 Arrangements or methods related to booting a display
• CPC Class Codes: G09G 2330/06 Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
• CPC Class Codes: G09G 3/006 Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309
• CPC Class Codes: G09G 3/2092 Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165
• CPC Class Codes: H02M 1/008 Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators
• CPC Class Codes: H02M 1/36 Means for starting or stopping converters
• CPC Class Codes: H02M 1/4208 Arrangements for improving power factor of AC input
• CPC Class Codes: H02M 1/4241 using a resonant converter
• CPC Class Codes: H02M 1/44 Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• CPC Class Codes: H02M 7/04 by static converters
• CPC Class Codes: H04N 5/63 Generation or supply of power specially adapted for television receivers
• CPC Class Codes: Y02B 70/10 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

Abstract

A high-power power supply for use with display devices and an associated display device are provided. The high-power power supply includes an AC conversion module configured to rectify an external AC source into a DC output, a power factor correction circuit configured to perform power factor correction to the DC output and output a correction completion signal when the correction is completed, a power-on control circuit configured to control the power factor correction circuit to be turned on to perform the power factor correction to the DC current when receiving a power-on signal and to control multiple resonance control circuits to be turned on when receiving the correction completion signal, a plurality of resonance control circuits configured to, when turned on, control multiple transformers to operate normally, and multiple transformers configured to supply different operating voltages to the display device. The present disclosure has the advantage of low cost.

Claims

1. A high-power power supply for use with a display device, comprising an AC conversion module, a power factor correction circuit, a power-on control circuit, a plurality of resonance control circuits, and a plurality of transformers configured to power the display device, wherein a power input terminal of the AC conversion module is configured to input an AC source, a power output terminal of the AC conversion module is coupled to an input terminal of the power factor correction circuit, a power output terminal of the power factor correction circuit is coupled through each of the plurality of resonance control circuits to the corresponding transformer, a power terminal of power-on control circuit is coupled to the power output terminal of the AC conversion module;

the power-on control circuit comprises a power-on signal receiving terminal, a feedback signal receiving terminal, and a plurality of signal output terminals, the feedback signal receiving terminal of the power-on control circuit being coupled to the power factor correction circuit, each of the plurality of signal output terminals of the power-on control circuit being coupled to the corresponding resonance control circuit, wherein,

the AC conversion module is configured to rectify the external AC source into a DC current;

the power factor correction circuit is configured to perform power factor correction to the DC current and output a correction completion signal after the correction is succeeded;

the power-on control circuit is configured to control the power factor correction circuit to be turned on to perform the power factor correction to the DC source when a power-on signal is received, and to control the plurality of resonance control circuits to be turned on when the correction completion signal is received;

the plurality of resonance control circuits are configured to, when turned on, control the plurality of transformers to operate normally;

the power-on control circuit comprises a signal receiving module, a first power-on module, and a second power-on module, wherein an input terminal of the signal receiving module is configured to receive an external power-on signal, an output terminal of the signal receiving module is coupled to an input terminal of the first power-on module, an output terminal of the first power-on module is coupled to the power factor correction circuit, an output terminal of the second power-on module is coupled both to the first resonance control circuit and the second resonance control circuit, and an input terminal of the second power-on module is coupled to the power factor correction circuit; and

the signal receiving module comprises a first diode, a first capacitor, a first resistor, a first transistor, a first optical coupler, a first power supply, a second resistor, and a third resistor;

an anode of the first diode is coupled to the power-on signal, and a cathode of the first diode is coupled through the first resistor to a base of the first transistor;

an emitter of the first transistor is grounded, and a collector of the first transistor is coupled to a control output terminal of the first optical coupler;

the second resistor is connected between the base and the emitter of the first transistor, the first capacitor is connected in parallel with the second resistor;

the signal receiving module further comprises a first power supply, and a control input terminal of the first optical coupler is coupled through the third resistor to the first power supply.

2. The high-power power supply according to claim 1, wherein the plurality of transformers comprise a first transformer configured to supply an operating voltage to a microprocessor of the display device, a second transformer configured to provide an operating voltage for a power amplifier of the display device, a third transformer configured to provide an operating voltage for a constant-current backlight source of the display device, and a fourth transformer configured to supply an operating voltage to a motherboard of the display device, wherein the power output terminal of the power factor correction circuit is coupled through each of the plurality of resonance control circuits to the first transformer, the second transformer, the third transformer, and the fourth transformer, respectively.

3. The high-power power supply according to claim 2, wherein the second transformer and the fourth transformer are the same transformer;

the second transformer comprises a primary winding, a first secondary winding, and a second secondary winding, wherein an input terminal of the primary winding of the second transformer is coupled to a first output terminal of the power factor conversion circuit, and an output terminal of the primary winding of the second transformer is coupled through a second resonance control circuit to a second output terminal of the power factor conversion circuit.

4. The high-power power supply according to claim 1, wherein the first power-on module comprises a second power supply, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second transistor, a third transistor, a first voltage regulator, a second voltage regulator, a second diode, a second capacitor, and a third capacitor;

an input terminal of the first optical coupler is coupled to the second power supply, an output terminal of the first optical coupler is coupled through the fourth resistor to a first terminal of the fifth resistor, and a second terminal of the fifth resistor is grounded;

an anode of the first voltage regulator is grounded, a cathode of the first voltage regulator is coupled both to the first terminal of the fifth resistor and to a base of the second transistor;

an emitter of the second transistor is coupled to a collector of the third transistor, a collector of the second transistor is coupled to the second power supply, a first terminal of the second capacitor is coupled to the emitter of the second transistor, and a second terminal of the second capacitor is grounded;

a first terminal of the sixth resistor is coupled to the collector of the third transistor, a second terminal of the sixth resistor is connected through the seventh resistor to the ground, and the collector of the third transistor is also coupled to the second power supply;

an anode of the second voltage regulator is grounded, a cathode of the second voltage regulator is coupled both to the base of the third transistor and a second terminal of the sixth resistor;

the cathode of the second diode is configured to output a turned-on signal of the power factor correction circuit, and an anode of the second diode is grounded via the third capacitor.

5. The high-power power supply according to claim 4, wherein the second power-on module comprises an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a fourth capacitor, a fourth transistor, a third diode, a fourth diode, a fifth diode, a sixth diode, and a first voltage reference chip;

a first terminal of the eighth resistor is configured to receive a feedback signal in response to the power factor correction circuit being turned on, and a second terminal of the eighth resistor is coupled to an anode of the third diode, and a cathode of the third diode is grounded via the fourth capacitor;

an anode of the fourth diode is coupled through the ninth resistor to a collector of the fourth transistor, both a cathode of the fourth diode and the cathode of the third diode are coupled to a voltage reference terminal of the first voltage reference chip, a cathode of the first voltage reference chip is coupled via the tenth resistor to a base of the fourth transistor, and an anode of the first voltage reference chip is grounded;

the eleventh resistor is coupled in parallel between the base and an emitter of the fourth transistor;

a cathode of the fifth diode is configured to output a turned-on signal of the first resonance control circuit, an anode of the fifth diode is coupled to the collector of the fourth transistor, and the emitter of the fourth transistor is coupled also to the second power supply;

a cathode of the sixth diode is configured to output a turned-on signal of the second resonance control circuit, and an anode of the sixth diode is coupled to the collector of the fourth transistor.

6. The high-power power supply according to claim 1, wherein the AC conversion module comprises an EMI filter and a rectifier bridge, an input terminal of the EMI filter being connected to the external AC power source, an output terminal of the EMI filter being coupled to an input terminal of the rectifier bridge, and an output terminal of the rectifier bridge being coupled to an input terminal of the power factor correction circuit.

7. A display device comprising a high-power power supply for use with display devices, the high-power power supply comprising an AC conversion module, a power factor correction circuit, a power-on control circuit, a plurality of resonance control circuits, and a plurality of transformers configured to power the display device, wherein a power input terminal of the AC conversion module is configured to input an AC source, a power output terminal of the AC conversion module is coupled to an input terminal of the power factor correction circuit, a power output terminal of the power factor correction circuit is coupled through each of the plurality of resonance control circuits to the corresponding transformer, a power terminal of power-on control circuit is coupled to the power output terminal of the AC conversion module, the power-on control circuit comprises a power-on signal receiving terminal, a feedback signal receiving terminal, and a plurality of signal output terminals, the feedback signal receiving terminal of the power-on control circuit being coupled to the power factor correction circuit, each of the plurality of signal output terminals of the power-on control circuit being coupled to the corresponding resonance control circuit, wherein,

the AC conversion module is configured to rectify the external AC source into a DC current;

the power factor correction circuit is configured to perform power factor correction to the DC current and output a correction completion signal after the correction is succeeded;

the power-on control circuit is configured to control the power factor correction circuit to be turned on to perform the power factor correction to the DC source when a power-on signal is received, and to control the plurality of resonance control circuits to be turned on when the correction completion signal is received;

the plurality of resonance control circuits are configured to, when turned on, control the plurality of transformers to operate normally;

the power-on control circuit comprises a signal receiving module, a first power-on module, and a second power-on module, wherein an input terminal of the signal receiving module is configured to receive an external power-on signal, an output terminal of the signal receiving module is coupled to an input terminal of the first power-on module, an output terminal of the first power-on module is coupled to the power factor correction circuit, an output terminal of the second power-on module is coupled both to the first resonance control circuit and the second resonance control circuit, and an input terminal of the second power-on module is coupled to the power factor correction circuit; and

the signal receiving module comprises a first diode, a first capacitor, a first resistor, a first transistor, a first optical coupler, a first power supply, a second resistor, and third resistor;

an anode of the first diode is coupled to the power-on signal, and a cathode of the first diode is coupled through the first resistor to a base of the first transistor;

an emitter of the first transistor is grounded, and a collector of the first transistor is coupled to a control output terminal of the first optical coupler;

the second resistor is connected between the base and the emitter of the first transistor, the first capacitor is connected in parallel with the second resistor;

the signal receiving module further comprises a first power supply, a control input terminal of the first optical coupler is coupled through the third resistor to the first power supply.

8. The display device according to claim 7, wherein the plurality of transformers comprise a first transformer configured to supply an operating voltage to a microprocessor of the display device, a second transformer configured to provide an operating voltage for a power amplifier of the display device, a third transformer configured to provide an operating voltage for a constant-current backlight source of the display device, and a fourth transformer configured to supply an operating voltage to a motherboard of the display device, wherein the power output terminal of the power factor correction circuit is coupled through each of the plurality of resonance control circuits to the first transformer, the second transformer, the third transformer, and the fourth transformer, respectively.

9. The display device according to claim 8, wherein the second transformer and the fourth transformer are the same transformer;

the second transformer comprises a primary winding, a first secondary winding, and a second secondary winding, wherein an input terminal of the primary winding of the second transformer is coupled to a first output terminal of the power factor conversion circuit, an output terminal of the primary winding of the second transformer is coupled through a second resonance control circuit to a second output terminal of the power factor conversion circuit.

10. The display device according to claim 7, wherein the first power-on module comprises a second power supply, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second transistor, a third transistor, a first voltage regulator, a second voltage regulator, a second diode, a second capacitor, and a third capacitor;

an input terminal of the first optical coupler is coupled to the second power supply, an output terminal of the first optical coupler is coupled through the fourth resistor to a first terminal of the fifth resistor, and a second terminal of the fifth resistor is grounded;

an anode of the first voltage regulator is grounded, a cathode of the first voltage regulator is coupled both to the first terminal of the fifth resistor and to a base of the second transistor;

an emitter of the second transistor is coupled to a collector of the third transistor, a collector of the second transistor is coupled to the second power supply, a first terminal of the second capacitor is coupled to the emitter of the second transistor, and a second terminal of the second capacitor is grounded;

a first terminal of the sixth resistor is coupled to the collector of the third transistor, a second terminal of the sixth resistor is connected through the seventh resistor to the ground, and the collector of the third transistor is also coupled to the second power supply;

an anode of the second voltage regulator is grounded, a cathode of the second voltage regulator is coupled both to the base of the third transistor and a second terminal of the sixth resistor;

the cathode of the second diode is configured to output a turned-on signal of the power factor correction circuit, and an anode of the second diode is grounded via the third capacitor.

11. The display device according to claim 10, wherein the second power-on module comprises an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a fourth capacitor, a fourth transistor, a third diode, a fourth diode, a fifth diode, a sixth diode, and a first voltage reference chip;

a first terminal of the eighth resistor is configured to receive a feedback signal in response to the power factor correction circuit being turned on, and a second terminal of the eighth resistor is coupled to an anode of the third diode, and a cathode of the third diode is grounded via the fourth capacitor;

an anode of the fourth diode is coupled through the ninth resistor to a collector of the fourth transistor, both a cathode of the fourth diode and the cathode of the third diode are coupled to a voltage reference terminal of the first voltage reference chip, a cathode of the first voltage reference chip is coupled via the tenth resistor to a base of the fourth transistor, and an anode of the first voltage reference chip is grounded;

the eleventh resistor is coupled in parallel between the base and an emitter of the fourth transistor;

a cathode of the fifth diode is configured to output a turned-on signal of the first resonance control circuit, an anode of the fifth diode is coupled to the collector of the fourth transistor, and the emitter of the fourth transistor is coupled also to the second power supply;

a cathode of the sixth diode is configured to output a turned-on signal of the second resonance control circuit, and an anode of the sixth diode is coupled to the collector of the fourth transistor.

12. The display device according to claim 7, wherein the AC conversion module comprises an EMI filter and a rectifier bridge, an input terminal of the EMI filter being connected to an external AC power source, an output terminal of the EMI filter being coupled to an input terminal of the rectifier bridge, and an output terminal of the rectifier bridge being coupled to an input terminal of the power factor correction circuit.

13. The display device according to claim 7, wherein the power factor correction circuit is implemented by a Fairchild®

semiconductor chip FAN9611.

14. The display device according to claim 7, wherein the plurality of resonance control circuits are implemented by a Fairchild®

semiconductor chip FSFR-XS.

15. The display device according to claim 7, wherein the power-on control circuit is configured to control the power factor correction circuit to be turned on when the power-on signal is received, and after the power factor correction circuit issues a completion signal to the power-on control circuit, the power-on control circuit is configured to control the plurality of resonance control circuits to be turned on, and each of the plurality of resonance control circuits, after turned on, is configured to control the corresponding transformer to output a predetermined voltage.

16. The display device according to claim 7, wherein the display device is a television.