Voltage selecting circuit capable of successfully turning on internal transistor even if the difference between input voltages is less than threshold voltage of internal transistor
US9772640B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 18, 2016 |
| Grant date | Sep 26, 2017 |
| Priority date | — |
| Expiry date | Oct 18, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/6242
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A voltage selecting circuit includes: a first transistor, having a first terminal coupled with a first input terminal and having a second terminal coupled with a voltage output terminal; a second transistor, having a first terminal coupled with a second input terminal and having a second terminal coupled with the voltage output terminal; a first resistor positioned between the first input terminal and a control terminal of the second transistor; a second resistor positioned between the second input terminal and a control terminal of the first transistor; a first current adjusting circuit coupled with the control terminal of the first transistor; a second current adjusting circuit coupled with the control terminal of the second transistor; a comparison circuit for comparing voltages at the first and second input terminals; and a control circuit configured to operably control the first current adjusting circuit and the second current adjusting circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.