Tuned power oscillators are important power-electronics circuits for achieving high power density. In addition, it is possible to apply the soft-switching techniques and high power-conversion efficiency can be achieved at high frequencies. This chapter presents fundamental operation and design of high-frequency high-efficiency tuned power oscillator. Concretely, the class-B oscillator family is introduced along with operation principle and design example.

Chapter Contents:

• 12.1 Introduction
• 12.2 Power amplifiers
• 12.2.1 Class-D amplifier
• 12.2.2 Class-E amplifier
• 12.2.3 Driver circuit
• 12.3 Tuned power oscillator
• 12.3.1 Free-running class-E oscillator
• 12.3.2 Injection-locked class-E oscillator
• 12.3.3 Class-EM oscillator with second harmonic injection
• 12.4 Design of free-running class-E oscillator
• 12.4.1 Design strategies
• 12.4.2 Numerical design procedure
• 12.4.2.1 Assumptions and parameters
• 12.4.2.2 Circuit equation
• 12.4.2.3 Conditions for the design
• 12.4.2.4 Numerical calculation algorithm
• 12.4.3 Design examples and experimental measurements
• 12.4.3.1 High and high input inductance
• 12.4.3.2 Other design examples
• 12.5 Conclusion
• References

Inspec keywords: power electronics; zero voltage switching; oscillators; circuit tuning; network synthesis; zero current switching

Other keywords: soft-switching; fundamental operation; power-conversion efficiency; class-B oscillator design; power-electronics circuits; high-frequency high-efficiency tuned power oscillator

Subjects: Oscillators; Power electronics, supply and supervisory circuits; General circuit analysis and synthesis methods