Class-E with Finite DC-Feed Inductance

Grebennikov, Andrei; Sokal, Nathan O.; Franco, Marc J.

doi:10.1016/b978-0-12-415907-5.00006-7

Cited by 3 publications

(10 citation statements)

References 47 publications

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“…The switch-mode power amplifier, especially Class-E PA, whose ideal efficiency reaches 100%, can be a good way to solve the problem above. Sokal and Sokal [1] proposed a structure of Class-E PA and then Rabb [2] analysed the performance of Class-E PA. Based on the current research direction of Class-E PA, it can be divided into two categories: Class-E PA with RF choke [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] and Class-E PA with finite dc feed (FDC) inductor [19][20][21][22][23][24][25]. From the point of view on the switch voltage, Class-E PA has three operating modes: non-zero-voltage switching (non-ZVS), suboptimal operation [ZVS and non-zero-voltage derivative switching (non-ZDS)] and optimal operation (ZVS and ZDS) [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…From the point of view on the switch voltage, Class-E PA has three operating modes: non-zero-voltage switching (non-ZVS), suboptimal operation [ZVS and non-zero-voltage derivative switching (non-ZDS)] and optimal operation (ZVS and ZDS) [1,2]. More exhaustive reporting about the operating principles of the optimal Class-E can refer to the chapter 6 in [18] and the chapter 'Class-E power amplifiers' in [26], and also the suboptimal Class-E in [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…The 'new' solutions reveal the existence of infinite design equations for Class-E PA with FDC inductor because of the additional freedom of the FDC inductor, slope of switch voltage and switch duty ratio. The design equations in [2,18,19] are subsets of the 'new' solutions in this paper. The presented 'new' solutions in this paper extend the 'design space' of Class-E PA, thereby offering much more freedom to design Class-E PA.…”

Section: Introductionmentioning

confidence: 99%

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‘New’ solutions of Class‐E power amplifier with finite dc feed inductor at any duty ratio

Nan

Chen

et al. 2014

IET Circuits, Devices & Systems

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'New' Class-E solutions are proposed by varying three different design parameters which are introduced in the voltage and current equations in order to extend the Class-E 'design space', of which the 'new' solutions can apply to optimal and suboptimal operation. The design procedure of suboptimal Class-E power amplifier (PA) is analysed in details and then a suboptimal Class-E PA based on GaN HEMT CGH40010F is designed to prove the correctness of the 'new' solutions. The measured maximum output power of 39.6 dB, power-added-efficiency of 74.7% and drain efficiency of 78.9% were obtained at 2.6 GHz with a 28 dBm input power. These measurement results show that a similar or better level of efficiency and output power that are reported for optimal Class-E PAs at lower frequencies using the same transistor, and the presented 'new' solutions extend the 'design space' of Class-E PA. This paper give engineers more degrees of freedom to design Class-E PA.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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‘New’ solutions of Class‐E power amplifier with finite dc feed inductor at any duty ratio

Nan

Chen

et al. 2014

IET Circuits, Devices & Systems

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“…transmitters. Among different types of Class E amplifiers much research effort is devoted to optimise a Class E ZVS (zero-voltage switching) amplifier with a power supply choke and a series resonant circuit [1][2][3][4][5]. One of possible improvements in this amplifier is the replacement of its supply choke with a finite dc-feed inductance.…”

Section: Introductionmentioning

confidence: 99%

“…One of possible improvements in this amplifier is the replacement of its supply choke with a finite dc-feed inductance. This also allows increasing load resistance and decreasing the amplitude of the current in the series resonant circuit for given output power and a supply voltage consequently reducing power losses in the circuit [2][3][4][5]. The improvement is useful e.g.…”

Section: Introductionmentioning

confidence: 99%

A Transformer Class E Amplifier

Mikolajewski¹

2014

Archives of Electrical Engineering

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In a high-efficiency Class E ZVS resonant amplifier a matching and isolation transformer can replace some or even all inductive components of the amplifier thus simplifying the circuit and reducing its cost. In the paper a theoretical analysis, a design example and its experimental verification for a transformer Class E amplifier are presented. In the experimental amplifier with a transformer as the only inductive component in the circuit high efficiency ηMAX = 0.95 was achieved for supply voltage VI = 36 V, maximum output power POMAX = 100 W and the switching frequency f = 300 kHz. Measured parameters and waveforms showed a good agreement with theoretical predictions. Moreover, the relative bandwidth of the switching frequency was only 19% to obtain output power control from 4.8 W to POMAX with efficiency not less than 0.9 in the regulation range.

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