Apparatus and methods of N-type load switch using bootstrap gate drive for wireless power receiver
US9484906B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 9, 2013 |
| Grant date | Nov 1, 2016 |
| Priority date | — |
| Expiry date | Apr 9, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Apparatus and methods are provided to power an N-type load switch using a bootstrap capacitor. In one embodiment, an integrated circuit for a wireless power receiver comprises a first rectifier input terminal (RX1), a second rectifier input terminal (RX2), a first bootstrap terminal (HSB1), a second bootstrap terminal (HSB2), and a load switch terminal (LSW). A first and a second bootstrap circuit are coupled with HSB1 and HSB2 to power the rectifier in a regular mode. A load switch driver circuit is coupled between LSW and either HSB1 or HSB2. In the regular mode the load switch driver circuit powers a load switch through a corresponding bootstrap circuit. In an output shutdown mode, an output shutdown circuit is turned on to turn off the load switch. In one embodiment, the load switch is external to the integrated circuit. In another embodiment, the load switch is internal to the integrated circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.