Electronic device having path of power supplied to display part switched according to whether external power is supplied

• US 20060232133A1
• Filed: 03/15/2006
• Published: 10/19/2006
• Est. Priority Date: 04/15/2005
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Cha, Jae-deok
• Granted Patent: US 7,446,432 B2
• Time in Patent Office: Days
• US Class Current: 307/23
• CPC Class Codes: H02J 9/062 for AC powered loads

Abstract

An electronic device operable from one of an external power supply and a battery. The electronic device includes a display part, a power converter, an inverter generating an operating voltage for the display part, a system part generating information to be displayed on the display part and operable from an output of the power converter, a battery, an input power detector, and a switching controller. The switching controller controls power to the inverter so that where the input power detector detects availability of an external power, the switching controller supplies the external power to the power converter and the power converter supplies power to the inverter to generate the operating voltage for the display part; and where the input power detector detects the external power is not available, the switching system supplies battery power to the power converter and the inverter independently.

Claims

1. An electronic device operative from one of an external power supply and a battery outputting first power, the electronic device comprising:

a display part;

a system power converter to convert the external power supplied from the external power supply into second power at a preset voltage level;

a display power converter to convert one of the first power and the second power into power for driving the display part and supply the converted power to the display part; and

a power controller to supply the second power from the system power converter as input power of the display power converter if detected that the external power is supplied from the external power supply, and supply the first power from the battery as the input power of the display power converter if the external power is cut off from the external power supply.

2. The electronic device according to claim 1, further comprising a system part to display an image through the display part, wherein the system power converter receives the first power if the external power is cut off from the external power supply to convert the first power into the second power, and the second power output from the system power converter is supplied as power for driving the system part.

3. The electronic device according to claim 1, wherein the display part comprises a light-receiving display panel to display an image thereon and a lamp to emit light to the display panel to display the image on the display panel, wherein the display power converter comprises an inverter to convert the first power or the second power into alternating current power for driving the lamp, and supply the alternating current power to the lamp.

4. The electronic device according to claim 3, wherein the display panel comprises a liquid crystal display (LCD) panel.

5. The electronic device according to claim 3, wherein the power controller comprises:

a power switch which is switched to supply one of the first power and the second power to the inverter; and

a switching controller to control the switch corresponding to the supply of the external power.

6. The electronic device according to claim 5, wherein the power switch comprises:

a first switch to control the first power to be supplied to the inverter; and

a second switch to control the second power to be supplied to the inverter.

7. The electronic device according to claim 6, wherein the second switch comprises a switching element to control the second power to be supplied to the inverter and a diode which is connected in parallel with the switching element to cut off power from the inverter to the system power converter.

8. The electronic device according to claim 1, wherein a voltage range of the second power is included in a range of the voltage level of the first power.

9. The electronic device according to claim 1, wherein the first power from the battery which is supplied as the input power of the display power converter does not pass through the system power converter in the state where the supply of the external power is cut off from the external power supply.

10. An electronic device operative from one of an external power supply and a battery outputting first power, the electronic device comprising:

a display part;

a system part to display an image through the display part;

a plurality of system power converters to convert one of the external power supplied from the external power supply and the first power into a second power at different voltage levels for driving the system part;

a display power converter to convert one of the second power output from one of the plurality of system power converters and the first power into a power for driving the display part, and supply the converted power to the display part; and

a power controller to supply the second power from one of the plurality of system power converters as an input power of the display power converter if detected that the external power is supplied from the external power supply, and supply the first power from the battery as the input power of the display power converter if the external power is cut off from the external power supply.

11. The electronic device according to claim 10, wherein a voltage level of the second power supplied to the display power converter is close to a voltage level of the first power.

12. The electronic device according to claim 10, wherein the display part comprises a light-receiving display panel to display an image thereon and a lamp to emit light to the display panel to display the image on the display panel, wherein the display power converter comprises an inverter to convert the first power or the second power into alternating current power for driving the lamp, and supply the alternating current power to the lamp.

13. The electronic device according to claim 12, wherein the display panel comprises a liquid crystal display (LCD) panel.

14. The electronic device according to claim 12, wherein the power controller comprises a power switch which is switched to supply one of the first power and the second power to the inverter;

and a switching controller to control the switch corresponding to the supply of the external power.

15. The electronic device according to claim 14, wherein the power switch comprises a first switch to control the first power to be supplied to the inverter and a second switch to control the second power to be supplied to the inverter.

16. The electronic device according to claim 15, wherein the second switch comprises a switching element to control the second power to be supplied to the inverter and a diode which is connected in parallel with the switching element to cut off power from the inverter to the system power converter.

17. The electronic device according to claim 10, wherein the first power from the battery which is supplied as the input power of the display power converter does not pass through the system power converter in the state where the supply of the external power is cut off from the external power supply.

18. The electronic device according to claim 11, wherein a voltage level of the second power supplied to the display power converter is within about 20 percent of a voltage level of the first power.

19. An electronic device, comprising:

a display part;

a power converter;

an inverter generating an operating voltage for the display part;

a system part generating information to be displayed on the display part and operable from an output of the power converter;

a battery;

an input power detector which detects an availability of external power; and

a switching controller controlling power to the inverter and the power converter, wherein;

where, in a first mode, the input power detector detects the availability of the external power, the switching system supplies the external power to the power converter and to the inverter via the power converter; and

where, in a second mode, the input power detector detects that the external power is not available, the switching system supplies battery power to the power converter and to the inverter independently of the power converter.

20. The electronic device of claim 19, wherein:

where the switching controller is supplying the external power to the power converter and the input power detector detects a loss of the external power, the switching controller supplies battery power to the power converter and to the inverter via the power converter during a time of transition from the first mode to the second mode.

21. The electronic device of claim 19, wherein:

the power converter supplies power to a component of the electronic device other than the inverter generating the operating voltage for the display part.

22. The electronic device of claim 19, wherein:

the power supplied to the inverter via the power converter and the power supplied to the inverter from the battery independent of the power converter have respective voltages which are equal within about 20 percent.