Two terminal drive of bipolar junction transistor (BJT) of a light emitting diode (LED)-based bulb
US9496855B2 · kind B2 · utility
3Cited by
117References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 28, 2014 |
| Grant date | Nov 15, 2016 |
| Priority date | — |
| Expiry date | Aug 28, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A bipolar junction transistor (BJT) may be used in a power stage DC-to-DC converter, such as for LED-based light bulbs. The BJT may be switched on and off from a controller coupled to two terminals of the BJT. Through the two terminals, the control IC may dynamically adjust a reverse recovery time period of the BJT. The reverse recovery time period may be adjusted by changing an amount of base charge that accumulates on the BJT. Additional, the reverse recovery may be controlled through the use of a reverse base current source applied to the BJT after beginning switching off the BJT.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.