Switching circuit with overload protection
US6420832B2 · kind B2 · utility
6Cited by
3References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 26, 2001 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | Apr 26, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B39/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A flasher circuit for switching incandescent lamps with field effect transistor switches is described for use on a school bus. A current sensing resistor develops an actual load current signal and a current limiting circuit which generates a signal corresponding to a predetermined limit value of load current. A control circuit turns off the field effect transistor when the actual value of load current exceeds the predetermined value. A micro controller holds the reference voltage at a higher level during the inrush current interval and switches it to a lower level during the steady state current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.