Circuit for discharging at input stage of a driver IC

Patent metadata

Field	Value
Publication number	US-9481289-B2
Application number	US-201114005344-A
Country	US
Kind code	B2
Filing date	Jul 19, 2011
Priority date	Mar 24, 2011
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

A discharge path circuit, the circuit providing a discharge path for an input terminal of an IC (Integrated Circuit) formed with a power input port connected to a first input and an operation mode selection port connected to a second port, the circuit comprising: an LC filter unit interconnected between the power input port and the first input to filter a noise in power; a first resistor interconnected between the first input and the second input; and a second resistor interconnected between the second input and a ground to provide a discharge path.

First claim

The invention claimed is:

1. A discharge path circuit providing a discharge path for an input terminal of an IC (Integrated Circuit) having a power input port connected to a first input and an operation mode selection port connected to a second input, the circuit characterized by:
an LC filter unit interconnected between the power input port and the first input to filter a noise in power;
a first resistor interconnected between the first input and the second input; and
a second resistor interconnected between the second input and a ground to provide the discharge path, wherein a first end of the second resistor is connected to the first resistor and a second end of the second resistor is connected to the ground,
wherein a DC power charged in the power input port is discharged through the second resistor when the first input is turned off, and
wherein a first end of the LC filter unit is connected to a first node coupled to the first input and a second end of the LC filter unit is connected to a second node coupled to the power input port of the IC, and
a first end of the first resistor is connected to the first node and a second end of the first resistor is connected to a third node coupled to the second input.

2. The discharge path circuit of claim 1 , characterized in that the first input is inputted with a power for driving the IC.

3. The discharge path circuit of claim 1 , characterized in that the second input is inputted with a signal for operation mode of the IC.

4. The discharge path circuit of claim 1 , characterized in that the LC filter unit includes:
an inductor interposed between the first input and the power input port; and
a capacitor interposed between the power input port and the ground.

5. The discharge path circuit of claim 4 , characterized in that an inductance value of the inductor is 2.2 μH, and a capacitance value of the capacitor is 220 μF.

6. The discharge path circuit of claim 1 , characterized in that a resistance value of the first resistor is 1 kΩ and a resistance value of the second resistor is 750Ω.

7. The discharge path circuit of claim 1 , wherein the first end of the second resistor is connected to the second end of the first resistor at the third node and the second end of the second resistor is connected to the ground.

8. The discharge path circuit of claim 1 , wherein the first and second resistors are passive devices.

Assignees

• Lee Young Wuk
• Lg Innotek Co Ltd

Inventors

• Lee Young Wuk

Classifications

• Y02B20/202

  Cross-Sectional Technologies · mapped topic

• B60Q1/06 Primary

  adjustable, e.g. remotely-controlled from inside vehicle (B60Q1/05 takes precedence) · CPC title

• H05B41/2885 Primary

  Static converters especially adapted therefor; Control thereof (H05B41/2882 takes precedence) · CPC title

• Y02B20/00

  Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps · CPC title

• B60Q1/0094

  Arrangement of electronic circuits separated from the light source, e.g. mounting of housings for starter circuits for discharge lamps (arrangements being part of the light source holder F21V17/06, F21S43/195) · CPC title