Capacitive load drive recovery circuit, capacitive load drive circuit and plasma display apparatus using the same

A capacitive load drive recovery circuit comprising:

• a first switch circuit, a coil and a second switch circuit connected in series between an output terminal connected to a capacitive load and a first reference potential;
• a third switch circuit connected between the connection point where the first switch circuit and the coil are connected, and the first reference potential;
• a fourth switch circuit connected between the connection point where the coil and the second switch circuit are connected, and the output terminal;
• and
• a power supply switch circuit connected between the output terminal and a drive power supply.

A capacitive load drive circuit comprising:

• a plurality of capacitive loads;
• a first drive power supply;
• a second drive power supply;
• and
• a plurality of pairs of first and second drive elements connected in series between the first drive power supply and the second drive power supply, and the connection point of which is connected to the plurality of capacitive loads, respectively,
• wherein either one of the first and second drive power supplies is a power recovery power supply equipped with a reactive power recovery circuit, and
• wherein the power recovery power supply comprises a power detection circuit detecting power consumption in the drive circuit and a control circuit controlling the action of the reactive power recovery circuit according to the detection result of the power detection circuit.

A capacitive load drive circuit comprising:

• a capacitive load having two drive terminals;
• a first drive power supply;
• a second drive power supply;
• a first switch circuit, a coil and a second switch circuit connected in series between the two terminals of the capacitive load;
• a third switch circuit connected between either terminal of the capacitive load and either terminal of the first drive power supply;
• a fourth switch circuit connected between either terminal of the capacitive load and the other terminal of the first drive power supply;
• a fifth switch circuit connected between the connection point where the first switch and the coil are connected, and the other terminal of the first drive power supply;
• a sixth switch circuit connected between the other terminal of the capacitive load and either terminal of the second drive power supply;
• a seventh switch circuit connected between the other terminal of the capacitive load and the other terminal of the second drive power supply;
• and
• an eighth switch circuit connected between the connection point where the second switch and the coil are connected, and the other terminal of the second drive power supply.

A capacitive load drive circuit comprising:

• a capacitive load having two drive terminals;
• a first drive power supply;
• a second drive power supply;
• a first switch circuit connected between either terminal of the capacitive load and either terminal of the first drive power supply;
• a second switch circuit connected between either terminal of the capacitive load and the other terminal of the first drive power supply;
• either coil of a transformer and a third switch circuit connected in series between either terminal of the capacitive load and the other terminal of the first drive power supply;
• a fourth switch circuit connecting the two terminals of the first drive power supply selectively to a first reference potential;
• a fifth switch circuit connected in parallel to the second switch circuit;
• a sixth switch circuit connected in parallel to the third switch circuit;
• a seventh switch circuit connected between the other terminal of the capacitive load and either terminal of the second drive power supply;
• an eighth switch circuit connected between the other terminal of the capacitive load and the other terminal of the second drive power supply;
• the other coil of the transformer and a ninth switch circuit connected in series between the other terminal of the capacitive load and the other terminal of the second drive power supply;
• a tenth switch circuit connecting the two terminals of the second drive power supply selectively to a first reference potential;
• an eleventh switch circuit connected in parallel to the eighth switch circuit;
• and
• a twelfth switch circuit connected in parallel to the ninth switch circuit.

A plasma display apparatus comprising:

• a plasma display panel having at least a pair of electrodes making up a capacitive load and causing discharge to occur between the pair of electrodes;
• and
• a capacitive load drive circuit connected at least either electrode of the pair of electrodes and driving the capacitive load,
• wherein the capacitive load drive circuit has a coil circuit connected between an output terminal to be connected to the one of electrodes and a reference potential and controls so that when the energy stored in the capacitive load is discharged, the energy is stored in the coil circuit and at the same time the energy is retained in the coil circuit while the current flowing through the coil circuit is increasing, and when the capacitive load is recharged, the stored energy is released while the current flowing through the coil circuit is decreasing.

A plasma display apparatus comprising:

• a plasma display panel having a plurality of scan electrodes and a plurality of address electrodes arranged so as to intersect the scan electrodes;
• a scan electrode drive circuit driving the plurality of scan electrodes;
• and
• an address electrode drive circuit driving the plurality of address electrodes,
• wherein the address electrode drive circuit has a coil circuit connected between an output terminal to be connected to the address electrode and a reference potential and controls so that when the energy stored in the capacitive load consisting of the address electrodes and the scan electrodes is discharged, the energy is stored in the coil circuit and at the same time the energy is retained in the coil circuit while the current flowing through the coil circuit is increasing, and when the capacitive load is recharged, the stored energy is released while the current flowing through the coil circuit is decreasing.