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In the 1970s, authors referred to the Class-E RF power amplifier circuit as “optimum” Class E if the switch-voltage waveform had zero voltage and zero voltage-slope at the switch turn-on time. “Optimum” was a misnomer; the correct term for that condition is now known to be “nominal” Class E. The optimum switch-voltage waveform has a positive voltage (assuming an NPN or N-channel transistor switch)...
This paper shows a Class-E RF power amplifier designed to obtain a flat-top transistor-voltage waveform whose peak value is 81% of the peak value of the voltage of a “Classical” Class-E amplifier.
Switching-mode DC/DC converters must be protected against overload, to prevent failure of the converter or the external current-carrying hardware. This paper collects, classifies, analyzes, and evaluates the known protection methods, and describes a new negative-feedback frequency modulator which prevents short-circuit-current runaway. Test data prove the effectiveness of the new scheme.
Power converters with free-running current-mode control (hysteretic, constant-“off”- time, or constant-“on”-time) can be frequency-stabilized or can be synchronized to a reference frequency. Those can by accomplished by feedforward, feedback, or phase-locking techniques. With hysteretic control, the frequency is controlled by varying the current hysteresis. With constant-“off”-time or constant-“on”-time...
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