High power switch-mode radio frequency amplifier method and apparatus
US5187580A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1992 |
| Grant date | Feb 16, 1993 |
| Priority date | — |
| Expiry date | Jul 6, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/2176
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Disclosed are both methods and a circuit to achieve powers of many kilowatts in radio frequency amplification using a switch mode amplifier in a new class of operation. In operation the invention utilizes internal switch characteristics. Methods create a substantial voltage step at the end of a response time period which allows greater output power without increasing the maximum switch voltage, reduces the maximum switch voltage for the same power, and which permits reduction of the stress on the switch element. Utilization of internal varactor capacitance avoids undesirable circulating currents and avoids the effects of lead inductance. The design allows use of less expensive components and high voltage switches not manufactured for radio frequency applications by preferring a substantial internal capacitance to establish maximum power. Other components of the network circuitry are also coordinated with the internal varactor capacitance. Adjustment of the conduction angle for optimum power and elimination of a need to bias the driver are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.