Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5699238 | Zero voltage switching controller of resonance mode converter and electronic ballast using the same | Young-Sik Lee, Hyun-min Jo, Nak-Choon Choi | 1997-12-16 |
| 5648702 | Dimming control circuit having feedback frequency control | Nak-Choon Choi | 1997-07-15 |
| 5546300 | Zero voltage switching controller of resonance mode converter and electronic ballast using the same | Young-Sik Lee, Hyun-min Jo, Nak-Choon Choi | 1996-08-13 |
| 5500792 | Zero-voltage switching type electronic ballast for fluorescent lamp | Dal-Young Jeon, Nak-Choon Choi, Bok-Ki Song, Dong Myeong SHIN | 1996-03-19 |
| 5349283 | Automatic voltage control circuit by using reactive power | — | 1994-09-20 |