Power on reset circuit, power supply circuit, and power supply system
US9270265B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 12, 2014 |
| Grant date | Feb 23, 2016 |
| Priority date | — |
| Expiry date | Jul 19, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/22
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A power on reset circuit including: a startup circuit keeping an operation signal in an operating state during a power supply rises; a bias circuit keeping the operation signal in the operating state; a BGR circuit being activated during the operating state, and outputting a fixed voltage after a predetermined time elapses; a power supply divided voltage generation circuit outputting a reference voltage; an activation detection circuit generating a control signal which becomes inactive when a power supply rises and becomes active when the fixed voltage reaches a predetermined level; a comparator circuit outputting a power on signal and detecting as the power on signal when the reference voltage is greater than the fixed voltage; and a switch turning on and fixing an output of the comparator circuit to an inactive logical value while the control signal is inactive, and turning off while the control signal is active.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.