Load-Independent Self-Tuned Parallel Resonant Power Oscillator

Frequency-Modulation Controlled Load-Independent Class-E Inverter

“…The load-independent class-E inverter [11]- [14] achieves constant output voltage, ZVS, and fixed phase shift between the driving signal and the output voltage at any load resistance without any control. This inverter attracts much attention recently [9]- [15] because of the appearance of the suitable applications, such as the WPT systems and the high-frequency resonant converters. On the other hand, the load-independent class-E inverter has a weakness against the component tolerance in the output resonant filter as well as the original class-E inverter.…”

“…By the way, the phase shift between the driving signal and the output voltage is determined uniquely in the nominal-operation class-E inverter. The self-tuned class-E inverter [15]- [17] uses this characteristic for achieving high power-conversion efficiency against the component tolerance in the output-resonant filter. The self-tuned class-E inverter adjusts the operating frequency to keep the nominal phase shift, making the inverter satisfy the class-E ZVS/ZDS conditions and the rated output voltage automatically.…”

Voltage-Source Parallel Resonant Class E Oscillator

“…The application includes dc-ac inverters, dc-dc converters, wireless power transfer (WPT), biomedical circuits, and fluorescent lamps. Class E oscillators [9]- [17] are composed of a Class E inverter and a feedback network which drives the inverter itself. Therefore, no external drive circuit is needed, which reduces additional semiconductors and power for the driving circuits.…”

“…The Class E oscillators [9]- [15] [17] have a dc-feed choke inductor as the original Class E inverter [1], and the oscillator [16] also has a dc blocking capacitor. The Class E oscillators are divided into two types; one has a series resonant circuit [9]- [15] and the other has a parallel resonant circuit [16] [17]. Several design procedures for the Class E oscillator with series resonant circuit have been proposed in [9]- [15].…”

“…Several design procedures for the Class E oscillator with series resonant circuit have been proposed in [9]- [15]. However, for the Class E oscillator with parallel resonant circuit, the literature [17] only presents the detailed equations so far. This paper proposes a new Class E oscillator with parallel resonant circuit, which is based on the voltage-source parallel resonant inverter [8].…”