Power supplying apparatus, a plasma display unit, a method of converting a direct-current voltage and a method of adding two direct-current voltages

A method of converting a direct-current voltage input to a power supplying apparatus for a plasma display panel directly into a higher direct-current voltage and of adding two direct-current voltages, said method comprising the steps of:

• 1) converting the input direct-current voltage by the steps of
• (a) connecting a plurality of N capacitors, for converting, in series to each other;
• (b) connecting the input direct-current voltage to a positive polarity side of a first capacitor of the N capacitors for converting and connecting the negative polarity side of the first capacitor to ground;
• (c) connecting the input direct-current voltage to a positive polarity side of an Mth capacitor of the N capacitors for converting and connecting a negative polarity side of the Mth capacitor to ground;
• (d) repeating step (c) for M=2 to N;
• and
• (e) outputting a boosted voltage of the positive polarity side of the first capacitor;
• and
• 2) adding two direct-current voltages including the steps of
• (a) connecting the input direct-current voltage to a positive polarity side of a capacitor for adding and connecting a negative polarity side of the capacitor for adding to ground;
• (b) connecting the boosted voltage to a negative polarity side of the capacitor for adding;
• and
• (c) outputting a voltage of the positive polarity side of the capacitor for adding to the plasma display panel.

A method of converting a direct-current voltage input to a power supplying apparatus for a plasma display panel directly into a higher direct-current voltage and of adding two direct-current voltages, said method comprising the steps of:

• 1) converting the input direct-current voltage by the steps of
• (a) connecting a plurality of N capacitors, for converting, in series to each other;
• (b) connecting the input direct-current voltage to a positive polarity side of a first capacitor of the N capacitors for converting and connecting the negative polarity side of the first capacitor to ground;
• (c) connecting the input direct-current voltage to a positive polarity side of an Mth capacitor of the N capacitors for converting and connecting a negative polarity side of the Mth capacitor to ground;
• (d) repeating step (c) for M=2 to N;
• and
• (e) connecting the input direct-current voltage to a negative polarity side of an Nth capacitor of the N capacitors;
• and
• (f) outputting a boosted voltage of the positive polarity side of the first capacitor;
• and
• 2) adding two direct-current voltages including the steps of
• (a) connecting the input direct-current voltage to a positive polarity side of a capacitor for adding and connecting a negative polarity side of the capacitor for adding to ground;
• (b) connecting the boosted voltage to a negative polarity side of the capacitor for adding;
• and
• (c) outputting a voltage of the positive polarity side of the capacitor for adding to the plasma display panel.

A power supplying apparatus which inputs a first direct-current voltage for sustaining a discharge in a plasma display panel, which generates a second direct-current voltage by adding the first direct-current voltage to a third direct-current voltage which is a different voltage from the first direct-current voltage, and which outputs the second direct-current voltage for starting discharge in the plasma display panel, said power supplying apparatus comprising:

• a capacitor having first and second terminals, for outputting the second direct-current voltage;
• a diode for supplying the first direct-current voltage to the first terminal of said capacitor;
• a first switching device for switching on and off the third direct-current voltage to the second terminal of said capacitor;
• and
• a second switching device for switching on and off a connection between the second terminal of said capacitor and a power supply whose voltage level is lower than the third direct-current voltage.

A plasma display unit having a plasma display panel and a power supplying apparatus which inputs a first direct-current voltage for sustaining a discharge in the plasma display panel, which generates a second direct-current voltage by adding the first direct-current voltage to a third direct-current voltage which is a different voltage from the first direct-current voltage and which outputs the second direct-current voltage for starting discharge in the plasma display panel, said power supplying apparatus comprising:

• a capacitor having first and second terminals, for outputting the second direct-current voltage;
• a diode for supplying the first direct-current voltage to the first terminal of said capacitor;
• a first switching device for switching on and off the third direct-current voltage to the second terminal of said capacitor;
• and
• a second switching device for switching on and off a connection between the second terminal of said capacitor and a power supply whose voltage level is lower than the third direct-current voltage.

A power supplying apparatus a) which inputs a first direct-current voltage for sustaining a discharge in a plasma display panel, b) which generates a second direct-current voltage by adding the first direct-current voltage to a third direct-current voltage, said third-direct current voltage is a different voltage from the first direct-current voltage, and c) which outputs the second direct-current voltage for starting discharge in the plasma display panel, said power supplying apparatus comprising:

• a capacitor having first and second terminals, for outputting the voltage for starting discharge;
• a diode for supplying the voltage for sustaining the discharge to the first terminal of said capacitor;
• a first switching device for switching on and off the third direct-current voltage to the second terminal of said capacitor;
• and
• a second switching device for switching on and off a connection between the second terminal of said capacitor and a power supply whose voltage level is lower than the third direct-current voltage.

A plasma display unit having a plasma display panel and a power supplying apparatus a) which inputs a first direct-current voltage for sustaining a discharge in the plasma display panel, b) which generates a second direct-current voltage by adding the first direct-current voltage to a third direct-current voltage, said third direct-current voltage is a different voltage from the first direct-current voltage and c) which outputs the second direct-current voltage for starting discharge in the plasma display panel, said power supplying apparatus comprising:

• a capacitor having first and second terminals, for outputting the voltage for starting discharge;
• a diode for supplying the voltage for sustaining the discharge to the first terminal of said capacitor;
• a first switching device for switching on and off the third direct-current voltage to the second terminal of said capacitor;
• and
• a second switching device for switching on and off a connection between the second terminal of said capacitor and a power supply whose voltage level is lower than the third direct-current voltage.