Voltage monitoring system for a negative supply voltage
US11188111B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 2020 |
| Grant date | Nov 30, 2021 |
| Priority date | — |
| Expiry date | Jun 9, 2040 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A voltage monitoring circuit portion is arranged to monitor a negative supply voltage (Vneg) and comprises a negative voltage generator arranged to generate the negative supply voltage (Vneg) and to output the negative supply voltage (Vneg) at an output terminal. A capacitor is arranged so that a first capacitor plate is connected to the output terminal of the generator and to a reference node via a potential divider. The potential divider is arranged to produce a monitor voltage (Vmonitor) between the resistors, where the reference node is supplied with a positive predetermined reference voltage (Vref). A comparator compares the monitor voltage (Vmonitor) to a threshold voltage (Vref_low) and to produce an output signal having a first value when the monitor voltage (Vmonitor) is below the threshold voltage (Vref_low) and having a second value otherwise. The negative voltage generator is enabled only when the output signal has its second value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.