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This paper describes the design of mm-wave integrated transformers and their application within a power amplifier (PA) in a 28 nm CMOS technology. The PA presents a 2-stage common-source differential topology and employs one transformer at the input and another at the output to perform single-ended to differential conversion, as well as another transformer to perform interstage matching. The baluns...
Rotary transformers can be used to provide magnetic coupling to the rotor circuit of a doubly fed induction generator. This topology eliminates the need for slip ring and brush assemblies thus reducing the maintenance required. This paper presents an analytical method for determining an optimal design of a rotary transformer. The methodology is used to design a 3 kVA three phase transformer which...
A single-phase Dual Active Half Bridge (DAHB) DC-DC converter topology is evaluated for medium voltage (MV) application. A 15kV SiC-IGBT based three-level half-bridge is connected to the high voltage (HV) primary side of a high frequency (HF) transformer operating at 10kHz link-frequency. A 1200V SiC-MOSFET based two-level H-bridge is connected on the low voltage (LV) secondary side. This topology...
This paper considers the solid-state transformer concept as a viable alternative to the line frequency transformer in distribution circuits. The benefits of the concept are presented in terms of improvements to problem areas currently experienced on distribution networks as well as envisaged future or fringe benefits. Some barriers to universal acceptance of the concept are also identified, with the...
A fully integrated 5.6-6.4 GHz power amplifier is implemented in a 0.25 mum SiGe-HBT technology using an on-chip transformer combining structure. The novel combiner topology combines the output power of two push pull pairs and leads to a reduced transistor size compared to a conventional combiner while enhancing the efficiency and maintaining the maximum output power. Electromagnetic modeling of the...
The majority of transformer model realizations used for power system transient simulations have some significant deficiencies, particularly related to the transformer core implementation. They either do not include the multilimb topology of the iron core, come upon some numerical stability issues, have limited use for three-phase transformers, or lack a complete leakage representation. Detailed consideration...
Half-bridge DC-DC converter with a current doubler rectifier is suited for low-voltage high-current on-board DC-DC converters. Due to the fact that peak-current-mode cannot be directly applied to the conventional half-bridge DC-DC converter, the voltage-mode control is most likely utilized. However, in this case, the DC current sharing between two inductors of the current-doubler rectifier cannot...
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