Energy recovery sustain circuit for AC plasma display panel

Details Energy recovery sustain circuit for AC plasma display panel Energy recovery sustain circuit for AC plasma display panel

2001-09-17

2003-06-24

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C315S169400, C345S037000, C345S060000

Reexamination Certificate

active

06583575

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the invention
The present invention relates to a plasma display panel (PDP), and more particularly, to an energy recovery sustain circuit for an AC plasma display panel. This application is based on Korean Patent Application No. 2000-56355, filed on Sep. 26, 2000, the entirety of which is hereby incorporated by reference.
2. Description of Related Art
The AC plasma display panel is a type of a luminous device which uses gaseous discharge within each discharge cell for displaying an image. Because the AC plasma display panel is simple to fabricate, easy to fabricate into a large-sized screen, and fast in response, it is used as a direct view image display with a large screen, particularly as a display directed to a HDTV.
The AC plasma display panel provided with electrodes, a dielectric layer, and a discharge gas, acts as a load capacitor which charges and discharges. However, the large power consumption required to drive the AC plasma display panel, i.e., in the charging and discharging of the load capacitor, particularly when the size is great, has been a great obstacle for making AC plasma display panels popular. Accordingly, instead of a general sustain circuit, an energy recovery sustain circuit for sustained driving of the panel has been introduced, for pursuing low power consumption in a driving circuit which drives the AC plasma display panel. The energy recovery sustain circuit is a circuit provided with an inductor which forms an LC resonance circuit with a load capacitor in the panel for recovery and temporary storage of energy lost during discharge of the load capacitor and supplying the energy for the next charging of the load capacitor, thereby reducing energy loss in the sustained driving of the panel.
FIG. 1
is a circuit diagram illustrating a typical energy recovery sustain circuit, provided with a system including first and second energy recovery sustain driving parts
10
and
20
of identical systems, for supplying sustain pulses of a voltage Vs to a load capacitor Cp in the AC plasma display panel. Each of the first and second energy recovery sustain driving parts
10
and
20
is provided with an output terminal OUT connected to the load capacitor Cp, an inductor Lc having one end connected to the load capacitor Cp through the output terminal OUT to form a resonance circuit, a capacitor Cc having a capacitance greater than the load capacitor Cp and one end grounded for charging and discharging voltage Vs/2 thereto/therefrom, capacitor discharging means
11
connected to the other end of the capacitor Cc and the other end of the inductor Lc for discharging the voltage Vs/2 charged in the capacitor Cc so as to charge the load capacitor Cp from 0 to Vs, first voltage sustaining means
12
connected to the output terminal OUT for sustaining voltage Vp on both sides of the load capacitor Cp to Vs when the load capacitor Cp is charged to voltage Vs, capacitor charging means
13
connected between the other end of the capacitor Cc and the other end of the inductor Lc for discharging the voltage Vs charged in the load capacitor Cp down to 0 volts to charge the capacitor Cc up to voltage Vs/2, and second voltage sustaining means
14
connected to the output terminal OUT for sustaining a voltage Vp on both sides of the load capacitor Cp at 0 volts when the load capacitor Cp is discharged down to 0 volts. The capacitor discharging means
11
is provided with first switching means S
1
having one end connected to the other end of the capacitor Cc, for being turned on while the load capacitor Cp is charged from 0 to voltage Vs, and a first diode D
1
having an anode connected to the other end of the first switching means S
1
and a cathode connected to the other end of the inductor Lc for receiving a current I
L
discharged from the capacitor Cc through the first switching means S
1
and providing to the inductor Lc while the first switching means S
1
is turned on. The capacitor charging means
13
is provided with second switching means S
2
having one end connected to the other end of the capacitor Cc for being turned on while the load capacitor Cp is discharged from voltage Vs to 0 volts, and a second diode D
2
having a cathode connected to the other end of the second switching means S
2
and an anode connected to the other end of the inductor Lc for receiving a current −I
L
discharged from the load capacitor Cp through the inductor Lc and providing to the second switching means S
2
while the first switching means S
1
is at turned on. The first voltage sustaining means
12
is provided with a third diode D
3
having a cathode connected to the output terminal OUT, and third switching means S
3
having one end connected an anode of the third diode D
3
and the other end connected to the Vs power source for being turned on when the load capacitor Cp is charged from 0 volts to voltage Vs. The second voltage sustaining means
14
is provided with a fourth diode D
4
having an anode connected to the output terminal OUT, and fourth switching means S
4
having one end connected to a cathode of the fourth diode D
4
and the other end grounded for being turned on when the load capacitor Cp is discharged from voltage Vs to 0 volts.
The operation of charging and discharging of the aforementioned typical type energy recovery sustain circuit will be explained with reference to FIG.
2
.
FIG. 2
shows voltage and current waveform according to switching timings of the switching elements S
1
to S
4
.
In the typical type energy recovery sustain circuit, when the entire system is turned on initially to have many continuous discharges at the load capacitor Cp, a current of discharge flows from the load capacitor Cp to respective capacitor Cc through the inductors Lc of the first and second energy recovery sustain driving part
10
and
20
, to charge the respective capacitors Cc to voltage Vs/2. When a voltage Vs/2 is charged in each of the capacitors Cc of the first and second recovery sustain driving parts
10
and
20
, periodic charging and discharging occurs between the typical energy recovery sustain circuit and the load capacitor Cp at proper intervals, making the energy recovery sustain drive for the AC plasma display panel. In this instance, the discharge in the load capacitor Cp is a sustain discharge for the AC plasma display panel. One cycle of the periodic charging and discharging between the typical energy recovery sustain circuit and the load capacitor Cp has four intervals, operations in each of which are different from one another.
<T
1
INTERVAL>
In the T
1
interval, the capacitors Cc of the first and second energy recovery sustain driving parts
10
and
20
are discharged to charge the load capacitors Cp with the discharge energies. In this T
1
interval, only the first switching means S
1
in the first and second energy recovery sustain driving parts
10
and
20
are turned on, while the other switching means S
2
, S
3
, and S
4
are left turned off. When the first switching means S
1
in the first and second energy recovery sustain driving parts
10
and
20
are turned on, the voltage Vs/2 charged in respective capacitors Cc are discharged, to flow a discharge current I
L
caused by the Vs/2 to the load capacitors Cp through the first switching means S
1
, the first diodes D
1
and inductors Lc. At the end, the load capacitors Cp are charged up to voltage Vs in T
1
interval by the discharge current I
L
from the first and second energy recovery sustain driving parts
10
and
20
, respectively. Accordingly, a waveform rising from 0 volts to voltage Vs, i.e., a rising section of the sustain pulse, is shown at the output terminal OUT.
<T
2
INTERVAL>
In the T
2
interval after the T
1
interval, voltage Vp at both ends of the load capacitor Cp is sustained at Vs, to charge the voltage Vs to the load capacitors Cp, continuously. In this T
2
interval, only the third switching means S
3
in the first and second energy recovery sustain driving parts
10
and
20
are turned on, while the other switc

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