Over-current protection circuit for voltage regulator
US4127886A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 21, 1977 |
| Grant date | Nov 28, 1978 |
| Priority date | — |
| Expiry date | Apr 21, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control transistor in the over-current protection circuitry of a voltage regulator is connected in a regenerative latch circuit with a complementary-conductivity auxiliary transistor, whereby conduction once initiated in said control transistor tends to be sustained. This avoids the tendency towards rapid oscillation between shut-down and power-up conditions in the over-current protection circuitry. The regenerative latch circuit loads the capacitor that supplies its sustaining current so heavily that the potential there-across decays, the decay finally advancing to the point where regeneration halts. The resulting non-conduction of the control transistor permits the voltage regulator to attempt to resume the power-up condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.