Systems and methods for regulation of propagation delay in DC motor drivers
US12113521B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 9, 2021 |
| Grant date | Oct 8, 2024 |
| Priority date | — |
| Expiry date | Nov 14, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/0045
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A control circuit regulates the propagation delay of a field effect transistor (FET) before the FET transitions to the Miller region by applying a pre-charge current for a fixed duration to the gates of the FET. After the fixed duration, the current is reduced to a lower drive current level which is based on a desired output voltage slew rate. After the FET transitions to the Miller region, the output voltage slews down in accordance with the output voltage slew rate. By regulating the slew-rate of the output voltage in the Miller region and regulating the propagation delay of the FET prior to the Miller region, the control circuit reduces electromagnetic interference (EMI) caused by the switching of the FET, thereby improving electromagnetic compatibility (EMC) of switch mode driver systems without increasing the propagation delay of the FET.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.