Electronic delay with stabilized output voltage and over current/short circuit protection
US12088088B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 4, 2022 |
| Grant date | Sep 10, 2024 |
| Priority date | — |
| Expiry date | Apr 5, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/008
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A system includes a circuit breaker and a delay circuit. The circuit breaker has a coil to enable control of a contact to selectively couple a load to a power source responsive to a coil voltage signal applied to the coil. The delay circuit has a depletion mode MOSFET and an energy storage circuit. The depletion mode MOSFET is controlled as an active current sink to provide the coil voltage signal based on a DC voltage signal. The energy storage circuit has an input coupled to a drain of the depletion mode MOSFET, a capacitor, and an output coupled to the drain of the depletion mode MOSFET, the energy storage circuit charges the capacitor from the DC voltage signal and delivers current to the depletion mode MOSFET to delay discontinuation of the coil voltage signal responsive to a drop or discontinuation of the DC voltage signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.