Resonant power converters are used in high-frequency signal applications, radio-frequency rectifiers (e.g., rectennas, or rectified antennas) and DC-DC power converters.
Resonant power converters enable higher switching frequencies than can be achieved with conventional pulse-width modulated, however, are limited by the sensitivity of inverter to loading conditions. This becomes problematic in DC-DC converter applications where the effective resistance presented by the matching network and rectifier varies greatly with output voltage and current. This problem is particularly severe in applications in which the voltage conversion ratio varies substantially. Such applications include charging systems where the converter must deliver constant power over a wide output voltage range, and regulating converters where the converter must operate over a wide input voltage range and/or the same converter design must be capable of supporting a range of output voltages.
The resistance compression networks described by the inventors are matching networks which includes resistance compression circuits, loads having equivalent resistances at a selected frequency that vary in a substantially identical fashion over a range of at least 2:1. The matching network is effective, at the selected frequency, to reduce sensitivity to loading conditions.
- Great reduction of the load sensitivity and efficient operation of resonant power converters as operating conditions change
- Expanding the range of applications for which high-frequency resonant power conversion is viable
- Improved matching between load and rectifier; increased performance, decreased loss