Charge limited high voltage switch circuits
US7449841B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 19, 2007 |
| Grant date | Nov 11, 2008 |
| Priority date | — |
| Expiry date | Jul 25, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/61
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
High voltage switches are configured with a junction transistor driven with a transformer coupled AC drive signal in the common base configuration or driven by a capacitor coupled charge pump. The high voltage switches may be configured as half wave or full wave switches wherein the junction transistor is driven during one or both half cycles of the AC drive signal. Bipolar switches that can stand off high DC voltage of either polarity, or that can stand off high AC voltage, are configured from two junction transistors with their bases connected and their emitters connected. These switches may also be driven in full wave or half wave mode, by a transformer or by single or dual capacitive charge pumps. Either NPN or PNP transistors may be used. Example drive circuits, which can be constructed as low voltage integrated circuits, are given for all of the switch types.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.