Exact analysis of class E tuned power amplifier at any Q and switch duty cycle

Abstract-The design of Class-E zero-voltage switching (ZVS)inverter with a loosely-coupled transformer is introduced in this paper. In the presented approach, the magnetizing and leakage inductances of the transformer are absorbed into the main circuit.The synthesis of the transformer-version of Class-E ZVS inverter into its equivalent 7f2a topology is presented. The 7f2a topology improves the range of the optimum load resistance required to achieve ZVS. An example of the Class-E inverter with dc supply voltage 10 V, output power 10 W, switching frequency 100 kHz and at a coupling coefficient of 0.77 is considered. The inverter is designed to achieve both zero-voltage switching (ZVS) and zero derivative switching (ZDS) conditions. The analytical expressions are validated through simulation results for an optimum coupling coefficient of 0.77. In view of potential misalignment between the primary and secondary coils, simulation results are provided for coupling coefficients, which are lower and higher than the optimum value. It is shown that both ZVS and ZDS can be achieved at a coupling coefficient lower than the optimum value and is not possible to achieve ZVS at a coupling coefficient higher than the optimum value. Overall efficiency of 94.3% is achieved at a coupling coefficient of 0.77, 93.4% at 0.85, and 92.12% at 0.7. The presented approach can be used for transformers with reactive load impedances also.

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“…The value of LiT was chosen as 30 JLH. Using (20), the new value of series capacitance Cs was determined as 71.3 nP. Fig.…”

Section: ----------------------------------------------mentioning

confidence: 99%

“…Class-E soft switching power inverters belong to a class of high efficiency electronic circuits [1] - [20]. At an optimum operating point, the Class-E inverters are capable of achieving both zero-voltage switching (ZVS) and zero-derivative switch ing (ZDS) [1]- [7].…”

Section: Introductionmentioning

confidence: 99%

Design of class-E ZVS inverter with loosely-coupled transformer at fixed coupling coefficient

Corti

Grasso

Reatti

et al. 2016

IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society

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“…One of the original assumptions of the Class-E amplifier design process was that it has an infinitely loaded quality factor (Q). Kazimierczuk et al presented a design procedure in which the amplifier can be designed at a specific Q and switch duty cycle (Kazimierczuk and Puczko, 1987). Suetsugu et al presented a design procedure to handle off-nominal operation where the voltage across C 1 is zero but its derivative is not, concluding that a higher C 1 capacitance is required for such conditions (Suetsugu and Kazimierczuk, 2006).…”

Section: Class-e Amplifiermentioning

confidence: 99%

Power Amplifiers for Electronic Bio-Implants

Laskovski¹,

Yuce²

2011

Biomedical Engineering, Trends in Electronics, Communications and Software

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“…To design class-E inverter we used [2], [3] and the values for the resonant tank elements L r and C r and shunt capacitance Ci were obtained. The resonant tank capacitance C r in series combination with the transformer's input capacitance makes the class-E inverter resonate with ZVS conditions.…”

Section: (3)mentioning

confidence: 99%

Multiple-output class E isolated dc-dc converter

Pavlovic

Oliver

Alou

et al. 2010

2010 IEEE Energy Conversion Congress and Exposition

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-This paper presents a multiple output class-E isolated dc-dc converter that regulates the output voltages at fixed switching frequency. The two output converter is simulated at operating frequency of 5 MHz. The converter output power is 40 W and the output voltages are 15 V and 5 V. All the switches operate at zero voltage switching (ZVS) conditions for the full load range. The circuit configuration is simple with small passive components which reduce the size of the converter. The circuit also has very good cross-regulation and an inherent short circuit protection with preserved ZVS conditions.

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Exact analysis of class E tuned power amplifier at any Q and switch duty cycle

Cited by 316 publications

References 15 publications

Design of class-E ZVS inverter with loosely-coupled transformer at fixed coupling coefficient

Design of class-E ZVS inverter with loosely-coupled transformer at fixed coupling coefficient

Power Amplifiers for Electronic Bio-Implants

Multiple-output class E isolated dc-dc converter

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