Inductor

About: Inductor is a research topic. Over the lifetime, 52565 publications have been published within this topic receiving 484068 citations. The topic is also known as: passive two terminal.

Power transformers and coupled inductors with optimum interleaving of windings

Abstract: A transformer or coupled inductor with any arbitrary turns ratio (for example, non-integral), and optionally with multiple secondary windings, has primary and secondary windings interleaved on the same winding layer, preferably around a magnetically permeable or an air core. This is capable of giving optimum magnetic coupling, minimum leakage fields and negligible proximity effect losses. The electrical turns ratio is determined by series or parallel, or combination series-parallel, connections of the physical turns of each winding.

A Novel Absolute Magnetic Rotary Sensor

Abstract: To measure the angular position of motors, robot joints, etc., an absolute magnetic rotary position sensor is developed, which possesses small-size, light, robust, and easy-to-integrate properties. The sensor consists of two inductors, i.e., a code disc and a signal processing part. Both of the two inductors are embedded with a big planar spiral copper coil and four smaller copper coils by employing microelectromechanical system (MEMS) technology, and there are two circles of regular copper sheets listing on the surface of the code disc. In addition, mathematical analyses of the inductor structure as well as the relationships of position and dimension among the coils and the copper sheet are addressed. Finite-element simulation results demonstrate that one group of the optimal sine and cosine signals can be generated by each inductor. Then, the absolute position measurement method is validated by a mathematical method. Finally, experiments are performed on the high-speed and the low-speed testing platforms to assess effectiveness and accuracy of the sensor.

Calculation of winding losses in high-frequency toroidal inductors using single strand conductors

Abstract: The paper is concerned with the optimisation of inductor design to improve the design capability for these large, expensive and heat-producing magnetic components in power electronic circuits. The work focuses on toroidal inductors which consist of uniformly distributed, solid conductor windings on low permeability toroidal cores. It develops methods of calculating the eddy current losses in the windings. The basic analytical equations for losses in the windings are evolved and the problem of variable turn pitch that arises in the toroidal geometry is dealt with by means of an effective core diameter concept. Effective core diameters are presented graphically in terms of normalised parameters. The theoretical and graphical results given in the paper enable toroidal inductor designs to be optimised, and losses to be calculated in a rapid and convenient way. Experimental results are shown to agree well with the theoretical results presented in the paper.

Low Frequency Pulsed Resonant Converter for Energy Harvesting

Abstract: A pulsed-resonant ac-dc converter and an integrated circuit (IC) controller have been designed, fabricated, and tested for harvesting energy from low-voltage (1.2V), low-power (1-100muW) energy transducers with output frequency in the 10-Hz-1-kHz range. Simulations using foundry models suggest that the silicon loss could be as low as 0.6muW, and the efficiency could reach 70%. With the IC experimentally packaged, the measured efficiency is between 50% and 70%, depending on the size and the loss in the resonant inductor

Multiphase DC to DC converter

Abstract: A multiphase DC to DC converter (100) includes an input (Vin), an output (Vout), at least first and second converters (104, 106), an inductor (L), an output capacitor (C), and a drive circuit The drive circuit is configured for switching the first and second converters (104, 106) with a predetermined phase shift therebetween The output capacitor (C) is operatively coupled between the first and secon converters (104, 106) and the output (Vout) The inductor (L) can be placed either at the input side or the output side When placed at the input side, the inductor (L) is operatively coupled between an input capacitor and the first and second converters When placed at the output side, the inductor is operatively coupled between the first and second converters and the output capacitor (C) The multiphase DC to DC converter is capable of achieving lossless switching transitions and negligible ripple current in the output capacitor (C)