Energy recovery circuit and energy recovery method using the same

• US 20040001290A1
• Filed: 06/28/2002
• Published: 01/01/2004
• Est. Priority Date: 06/28/2002
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: U Kim, Cheul, Park, Han Woong, Yoon, Won Sik, Kang, Feel Soon
• Granted Patent: US 7,009,823 B2
• Time in Patent Office: Days
• US Class Current: 361/15
• CPC Class Codes: G09G 2330/025 Reduction of instantaneous peaks of current
• CPC Class Codes: G09G 3/2965 using inductors for energy recovery

Abstract

An energy recovery circuit wherein an energy stored in an inductor is applied to a panel to reduce a charge time and improve an energy recovery efficiency. In the energy recovery circuit, a switch, a capacitor and an inductor is provided to form a closed loop. A panel capacitor is equivalently provided at the panel. When the switch is turned on, a current component of an energy is charged in the inductor by an energy charged in the capacitor. When the switch is turned off, an inverse voltage is inducted into the inductor and a closed loop is formed by the inductor and the panel capacitor, thereby applying only an inverse voltage of the inductor to the panel capacitor.

Claims

1. An energy recovery circuit, comprising:

a switch, a capacitor and an inductor provided to form a closed loop; and

a panel capacitor equivalently provided at the panel,

wherein when the switch is turned on, a current component of an energy is charged in the inductor by an energy charged in the capacitor, and

when the switch is turned off, an inverse voltage is inducted into the inductor and a closed loop is formed by the inductor and the panel capacitor, thereby applying only an inverse voltage of the inductor to the panel capacitor.

2. The energy recovery circuit as claimed in claim 1, wherein the capacitor is charged by energy recovered from the panel capacitor.

3. The energy recovery circuit as claimed in claim 1, further comprising:

a diode, being provided between the inductor and the panel capacitor, for applying a voltage from the inductor to the panel capacitor while shutting off other voltage.

4. The energy recovery circuit as claimed in claim 1, further comprising:

a sustain voltage source for generating a sustain voltage;

a second switch provided between the sustain voltage source and the panel capacitor to be turned on when a voltage from the sustain voltage source is applied to the panel capacitor;

a third switch having one terminal connected to the switch and the capacitor and other terminal connected to a ground voltage source; and

a fourth switch connected between the second switch and the ground voltage source.

5. The energy recovery circuit as claimed in claim 1, wherein said inverse voltage inducted into the inductor has approximately a voltage level of the sustain voltage source.

6. The energy recovery circuit as claimed in claim 1, wherein when the third switch is turned on, the capacitor, the panel capacitor and the second switch form a closed loop to recover en energy of the panel capacitor into the capacitor.

7. The energy recovery circuit as claimed in claim 3, wherein when the switch is turned off, the inductor into which said inverse voltage is inducted, the panel capacitor and the diode form a closed loop.

8. The energy recovery circuit as claimed in claim 4, wherein when the switch is turned off, the inductor into which said inverse voltage is inducted, the panel capacitor and the diode form a closed loop.

9. The energy recovery circuit as claimed in claim 4, wherein when the fourth switch is turned on, the panel capacitor is connected to any one of the ground voltage source and the zero voltage source for its initialization.

11. The energy recovery method as claimed in claim 9, further comprising the step of:

applying a voltage from the sustain voltage source to the panel capacitor.

12. The energy recovery method as claimed in claim 9, further comprising the step of:

recovery an energy charged in the panel capacitor into the capacitor.

13. The energy recovery method as claimed in claim 9, further comprising the step of:

connecting the panel capacitor to any one of the ground voltage source and the zero voltage source to initialize the panel capacitor.

10. An energy recovery method using an energy recovery circuit including a panel capacitor equivalently provided at a panel, comprising the steps of:

charging a current component of an energy into an inductor by utilizing an energy charged in the capacitor;

deriving an inverse voltage into the inductor; and

forming a closed loop by the inductor and the panel capacitor to apply only an inverse voltage of the inductor to the panel capacitor.