Plasma display device and power supply thereof

• US 20080116812A1
• Filed: 07/31/2007
• Published: 05/22/2008
• Est. Priority Date: 11/20/2006
• Status: Abandoned Application

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Lee, Il-Woon
• Application Number:
  US11/888,538
• Publication Number:
  US 20080116812A1
• Time in Patent Office: Days
• US Class Current: 315/169.4
• CPC Class Codes: G09G 2330/028 Generation of voltages supplied to electrode drivers in a matrix display other than LCD
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/294 for lighting or sustain discharge
• CPC Class Codes: G09G 3/296 Driving circuits for producing the waveforms applied to the driving electrodes

Abstract

A plasma display device and its power supply are disclosed. The plasma display device includes driving circuit units for driving the display and a power supply for generating a plurality of power source voltages for the driving circuit units. The power supply includes a power supply unit with a first coil of a primary side of a transformer, converting an input voltage to a square wave for the first coil to provide power to second to the coils of the secondary side of the transformer.

Claims

1. A plasma display device comprising:

a plurality of first electrodes, a plurality of second electrodes, and a plurality of third electrodes formed to cross the first and second electrodes;

first, second, and third driving circuit units configured to respectively drive the first, second and third electrodes; and

a power supply configured to generate a plurality of voltages for the driving circuit units, wherein the power supply comprises;

a power supply unit comprising a first coil of a primary side of a transformer and an input converter configured to convert an input voltage to a square wave for the first coil; and

a plurality of output units configured to output a plurality of first power source voltages, each output unit comprising an additional coil on a secondary side of the transformer, the additional coil coupled to the first coil through the transformer,

wherein at least one of the output units further comprises a converter configured to convert the corresponding first power source voltage to output a plurality of second power source voltages.

2. The device of claim 1, wherein the plurality of first power source voltages are each generated with a buck type converter in each of the output units.

3. The device of claim 2, wherein a first buck type converter included in a first output unit comprises:

a second coil having one end connected with a first power source for supplying an ‘

M’

voltage;

a first diode having an anode connected with the second coil;

a first transistor connected with a cathode of the first diode;

a second diode having a cathode connected with the first transistor and an anode connected with the second coil;

an S coil connected with the cathode of the second diode; and

a first capacitor connected with the S coil and with the first power source.

4. The device of claim 3, wherein the first buck type converter further comprises:

a switching controller configured to compare a level of one of the plurality of first power source voltages with a reference voltage, and to turn on or off the first transistor.

5. The device of claim 4, wherein buck type converters are respectively included in each of the output units.

6. The device of claim 3, wherein the M voltage is a ground voltage.

7. The device of claim 3, wherein the cathode of the first diode is connected with a drain of the first transistor and the cathode of the second diode is connected with the source of the first transistor.

8. The device of claim 1, wherein the plurality of first power source voltages are different voltages.

9. The device of claim 1, wherein the plurality of second power source voltages are different voltages.

10. The device of claim 2, wherein the input voltage is a DC voltage output from a power factor correction (PFC) circuit.

11. A power supply configured to generate a plurality of voltages for driving a plurality of first electrodes, a plurality of second electrodes, and a plurality of third electrodes formed to cross the first and second electrodes, in a plasma display device, the power supply comprising:

a power supply unit including a first coil of a primary side of a transformer and an input converter configured to convert an input voltage to a square wave for the first coil; and

a plurality of output units configured to output a plurality of first power source voltages, each output unit comprising an additional coil of a secondary side of the transformer, the additional coil coupled to the first coil through the transformer,

wherein at least one of the output units further comprises a converter configured to convert the corresponding first power source voltage to output a plurality of second power source voltages.

12. The power supply of claim 11, wherein the plurality of first power source voltages are each generated with a buck type converter in each of the output units.

13. The power supply of claim 11, wherein the power supply unit comprises:

a first capacitor connected with a voltage input terminal;

a second capacitor connected with the first capacitor and connected with a first power source configured to supply an M voltage;

a first transistor connected with the first capacitor;

a second transistor connected with the first transistor and connected with the second capacitor; and

an S coil connected with the first and second capacitors and connected with the first and second transistors.

14. The power supply of claim 13, wherein the first and second capacitors have substantially the same capacitance.

15. The power supply of claim 13, wherein the power supply unit further comprises:

a duty generating circuit configured to provide a control signal to control the first and second transistors.

16. The power supply of claim 13, wherein the duty generating circuit drives the first and second transistors according to the same duty.

17. The power supply of claim 13, wherein the M voltage is a ground voltage.

18. The power supply of claim 13, wherein the first capacitor is connected with a drain of the first transistor, and the second capacitor is connected with a source of the second transistor.

19. The power supply of claim 11, wherein the plurality of first power source voltages are different voltages.

20. The power supply of claim 11, wherein the plurality of second power source voltages are different voltages.