H.H. Wu

Utah State University, Logan, Ohio, United States

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Publications (10)13.28 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: This paper presents a 1.2 kW Inductive Power Transfer (IPT) lighting system using the parallel AC processing pickup. The AC processing pickup has been shown as an efficient and economic approach for producing high frequency AC outputs. IPT technology provides electrical power in a contactless manner, allowing multiple 1.2 kW stage lights to be configured anywhere along the IPT track. This significantly reduces the setup time and improves the flexibility of such a system. The first description of a feedback control system with the AC processing pickup is proposed to improve the performance. Experimental results are given for the 1.2 kW lighting system.
    Industrial Electronics and Applications (ICIEA), 2011 6th IEEE Conference on; 07/2011
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    ABSTRACT: This paper presents a new type of series ac-processing pickup used in inductive-power-transfer applications. The proposed pickup uses an ac switch operating under zero-current-switching conditions in series with a resonant network to produce a controllable ac voltage source suitable for driving incandescent lights. When a rectifier is cascaded onto this pickup, it can also produce a precisely controlled dc voltage. This topology eliminates the need to use an extra buck converter after the traditional series pickup for controlling the output load voltage to a desired value, which may be different from the induced voltage of the pickup. Furthermore, this pickup has the ability to control the inductor current directly, and hence, eliminate the transient inrush current at startup for the series-tuned resonant tank. The circuit is analytically analyzed and the maximum efficiency for a 1.2-kW prototype is measured to be 93%.
    IEEE Transactions on Power Electronics 02/2011; · 4.08 Impact Factor
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    ABSTRACT: This paper presents a 1kW inductive charging system for Electric Vehicles (EV's). The primary topology uses an LCL converter and the secondary topology uses a parallel AC processing pickup to produce a controllable current source ideal for EV battery charging applications. Standard circular pads with a diameter of 420mm were used. The system can operate over a variable charging height of 45-90mm. The measured efficiency from the AC mains socket to the DC battery is 73-83% at rated power conditions of 1kW depending on the relative height and alignment of the pads.
    Industrial Electronics and Applications (ICIEA), 2011 6th IEEE Conference on; 01/2011
  • H.H. Wu, J.T. Boys, G.A. Covic
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    ABSTRACT: This paper presents a new type of inductive power transfer (IPT) pickup that directly regulates the power in ac form, hence producing a controllable high-frequency ac source suitable for lighting applications. The pickup has significant advantages in terms of increasing system efficiency, reducing pickup size, and lowering production cost compared to traditional pickups that also produce a controlled ac output using complex ac-dc-ac conversion circuits. The new ac processing pickup employs switches operating under zero-voltage-switching conditions to clamp parts of the resonant voltage across a parallel tuned LC resonant tank to achieve power regulation over a wide load range. The operation of the pickup is analyzed and the circuit waveforms have been verified by experimental results. A complete IPT system using the ac processing pickup was tested on a 500-W lighting system and an efficiency of 96% was obtained when delivering 500 W to multiple resistive light bulbs.
    IEEE Transactions on Power Electronics 06/2010; · 4.08 Impact Factor
  • IEEE Transactions on Power Electronics 05/2010; 25(5):1275-1284. · 4.08 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: This paper presents a new type of Inductive Power Transfer (IPT) pickup which directly regulates power in AC form, hence producing a controllable high-frequency AC source. The pickup has significant advantages in terms of increased system efficiency, reduced pickup size and low production cost compared to traditional pickups that also produce a controlled AC output using complex AC-DC-AC conversion circuits. The new AC processing pickup employs switches operating under soft switching conditions to clamp parts of the resonant voltage across a parallel tuned LC resonant tank to achieve power regulation over a wide load range. A design procedure is proposed and verified using a 550 W lighting system. An efficiency of 96% is obtained when delivering 550 W to multiple resistive light bulbs.
    Industrial Electronics, 2009. IECON '09. 35th Annual Conference of IEEE; 12/2009
  • [Show abstract] [Hide abstract]
    ABSTRACT: This paper presents a new type of Inductive Power Transfer (IPT) pickup which directly regulates power in AC form, hence producing a controllable high-frequency AC source. The pickup has significant advantages in terms of increasing system efficiency, reducing pickup size and lowering production cost compared to traditional pickups that also produce a controlled AC output using complex AC-DC-AC conversion circuits. The new AC processing pickup employs switches operating under soft switching conditions to clamp parts of the resonant voltage across a parallel tuned LC resonant tank to achieve power regulation over a wide load range. A complete IPT system using the AC processing pickup is tested on a 500 W lighting system and an efficiency of 96% is obtained when delivering 500 W to multiple resistive light bulbs.
    Energy Conversion Congress and Exposition, 2009. ECCE 2009. IEEE; 10/2009
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    ABSTRACT: This paper presents a compact push-pull current-fed parallel resonant converter suitable for implementing a Transcutaneous Energy Transmission (TET) system to power heart assist devices. The new circuit topology integrates all three magnetic components of a conventional current-fed push-pull resonant converter including the DC inductor, phase splitting transformer and primary coil inductor into a coreless dual primary coil configuration, which significantly reduces the size and weight of the system. A stroboscopic mapping model is developed and used to analyse the circuit performance. Experimental results have demonstrated that the proposed converter performs very well and can achieve a DC to AC power efficiency of 90.5% at an output power of 10 W.
    Industrial Electronics and Applications, 2009. ICIEA 2009. 4th IEEE Conference on; 06/2009
  • [Show abstract] [Hide abstract]
    ABSTRACT: This paper presents the design of an IPT security camera system with the integration of a secure wireless communication scheme. Two innovative circuits known as an LCL tuning circuit and a multi-phase interleaving system have been applied to the design of the IPT pick-up circuit. A wireless local area network (WLAN) using 802.11 g protocol has been chosen to realise the high bandwidth communication scheme which supports multiple cameras to operate simultaneously to form a multi-drop configuration. An experimental prototype has been built to verify the proposed concept.
    Industrial Electronics and Applications, 2009. ICIEA 2009. 4th IEEE Conference on; 06/2009
  • [Show abstract] [Hide abstract]
    ABSTRACT: Optimal tuning capacitor values corresponding to the maximum power transfer of a voltage-fed series-tuned transcutaneous energy transfer (TET) system are derived. The theoretical analysis is verified by experimental results. The maximum power transfer capacity can be three times greater compared to the traditional method, which tunes the capacitor at the nominal resonant frequency without considering the mutual inductance effect. These results are useful to enable an existing series-tuned TET system to meet short-term high-power demands where efficiency is not a key factor.
    Electronics Letters 05/2009; · 1.04 Impact Factor