Posted On: September 3, 2013 by Robert Vrana

Judge Stark Construes Terms of Semiconductor Patents

Fairchild Semiconductor Corp. v. Power Integrations, Inc. is a patent infringement case involving semiconductors, power supplies, and LED circuits. The plaintiff, Fairchild, asserted three patents, and the defendant, Power Integrations, counterclaimed alleging infringement of five additional patents. Following a Markman hearing in July, Judge Stark has now issued a claim construction order in the case. Judge Stark construed the following terms:

- “a second feedback signal associated with a current control loop”
- “generates the first feedback signal by sampling a voltage from the auxiliary winding of the transformer and a discharge time of the transformer”
- “generating the first feedback signal by sampling a voltage from the auxiliary winding of the transformer and a discharge time of the transformer”
- “means for regulating the power supply system”
- “the control circuit and the feedback circuit are operable to regulate”
- “the feedback circuit operable to support regulation by the control circuit”
- “generating a LED current for controlling the LED”
- “a sense terminal of the control circuit, coupled to the LED for detecting a LED voltage, wherein the LED voltage is coupled for adjusting the LED current”
- “a soft start circuit means”
- “An oscillator that provides a maximum duty cycle signal comprising an on-state and an off-state”
- “a control circuit coupled to an input of a power converter”
- “when the electrical energy source is uncoupled from the input of the power converter”
- “a capacitance coupled between input terminals of the input of the power converter”
- “render dormant the drive signal generator”
- “power up the drive signal generator”
- “current input circuit”
- “current limit”
- “current limit adjustment signal”
- “dynamically adjust a current limit”

Fairchild Semiconductor Corp., et al. v. Power Integrations, Inc., C.A. No. 12-540-LPS, Memo. Op. at 1-25 (D. Del. Aug. 28, 2013).

Fairchild Semiconductor Corp., et al. v. Power Integrations, Inc., C.A. No. 12-540-LPS (D. Del. Aug. 28, 20...