BJT drive scheme
US9735663B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 2014 |
| Grant date | Aug 15, 2017 |
| Priority date | — |
| Expiry date | Jan 26, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/335
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention generally relates to switch mode power converters (SMPCs). and methods for providing supplementary base drive to a bipolar transistor of an SMPC, and more particularly to a switching control circuit for a SMPC, a said SMPC having an inductive component coupled to receive power from an input to the SMPC, a bipolar transistor coupled to control current flow in the inductive component, an auxiliary power rail, a charge store for supplying power via the auxiliary rail to a switching control circuit for driving the bipolar transistor, and a bootstrap circuit for bleeding current from the input to the bipolar transistor to thereby provide an amplified current to the charge store, the switching control circuit comprising: a base current line for coupling to a base terminal of a said bipolar transistor, an emitter current line for coupling to an emitter terminal of a said bipolar transistor, an auxiliary line for coupling to a said auxiliary power rail, and at least one reference line for coupling to a reference voltage; a base current switch configured to controllably couple a base current source to the base current line; an emitter current switch configured to controllably …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.