Fault detection circuit for a PWM driver, related system and integrated circuit
US10197625B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 2016 |
| Grant date | Feb 5, 2019 |
| Priority date | — |
| Expiry date | Jul 28, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K21/38
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Fault detection circuitry and a corresponding method are disclosed. A count value that is indicative of the switching period of a PWM signal is determined and it is determined whether this count value is between a first threshold and a second threshold. An error signal is generated when the switching period is not between the first and the second threshold. A count value that is indicative of the switch-on duration of the PWM signal is determined and compared with a switch-on threshold in order to determine whether the switch-on duration is greater than a maximum switch-on duration. A count value that is indicative of the switch-off duration of the PWM signal is determined and compared with a switch-off threshold in order to determine whether the switch-off duration is greater than a maximum switch-off duration. Error signals can be generated when the durations are greater than the maximum durations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.