Start-up circuit and method using a depletion mode transistor
US9912228B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 4, 2016 |
| Grant date | Mar 6, 2018 |
| Priority date | — |
| Expiry date | Aug 4, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/33523
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A start-up circuit includes an input node, an output node, a reference node, and a depletion mode field-effect transistor (FET) having a first terminal coupled to the input node, a second terminal coupled to the output node, and a gate terminal. A Zener diode has a cathode coupled to the gate terminal of the FET and an anode coupled to the reference node. A first capacitor is coupled in parallel with the Zener diode, a first resistor is coupled between the gate terminal of the FET and the input node, and a second resistor is coupled between the second terminal of the FET and the reference node. The FET and the second resistor are configured to generate an output voltage on the output node, the output voltage being based on an input voltage on the input node and capped at a value below a peak value of the input voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.