Good morning.
I am using an Infineon IMW65R072M1HXKSA1 to build a class E amplifier to operate @ 13.63 Mhz, for operation in the 20-50 watt power range. I am struggling to get the Mosfet to work in class E mode. When I drive the Gate @ 13.63 Mhz , the DC power supply (48 volts) pulls maximum current, even with the load disconnected, implying that the Mosfet is dissipating power across it's internal resistance. As I understand it, voltage and current ought to be 180 deg out of phase. I am driving the mosfet @ approximately 17 volts.
Please see attached the schematic and calculator for approximately the component values I'm using.
Basically I don't know how to keep the voltage and current sufficiently out of phase across the MOSFET such that I can get an efficiency improvement on a class AB type design. Any thoughts would be much appreciated.
I am using an Infineon IMW65R072M1HXKSA1 to build a class E amplifier to operate @ 13.63 Mhz, for operation in the 20-50 watt power range. I am struggling to get the Mosfet to work in class E mode. When I drive the Gate @ 13.63 Mhz , the DC power supply (48 volts) pulls maximum current, even with the load disconnected, implying that the Mosfet is dissipating power across it's internal resistance. As I understand it, voltage and current ought to be 180 deg out of phase. I am driving the mosfet @ approximately 17 volts.
Please see attached the schematic and calculator for approximately the component values I'm using.
Basically I don't know how to keep the voltage and current sufficiently out of phase across the MOSFET such that I can get an efficiency improvement on a class AB type design. Any thoughts would be much appreciated.
Attachments
-
158.7 KB Views: 105
-
77 KB Views: 97