Yuanzheng Han

Bio: Yuanzheng Han is an academic researcher from University of Toronto. The author has contributed to research in topics: Filter (video) & Electric vehicle. The author has an hindex of 2, co-authored 2 publications receiving 16 citations.

A bidirectional multi-port DC-DC converter with reduced filter requirements

Abstract: Practical challenges in distributed generation and electric vehicles have motivated the rapid development of bidirectional multi-port dc-dc converters. This paper proposes a converter that not only can perform fast battery voltage balancing and limit ground leakage current, it also features low switching ripple and component count, providing significant cost savings from reduced filter requirements and improved efficiency. Experimental testing of a 3.3 kW prototype confirms the bidirectional power transfer capability and demonstrates above 99% converter efficiency over a wide range of input power.

Multi-port converter structure for dc/dc power conversion

Abstract: A module for interconnecting a pair of DC sources or a pair of DC loads into a DC bus includes: a first port for each source or load; a switching cell for each first port, each cell having a pair of terminals and a switching node; a second port operatively connected to the DC bus and having a pair of terminals, one of the pair of terminals of the second port being connected to one of the terminals of one of the cells and the other of the pair of terminals of the second port being connected to one of the terminals of the other of the cells; and a filter inductor connected between the switching nodes of the cells. Systems including the module and methods utilizing the system are also disclosed.

Constant Current Fast Charging of Electric Vehicles via a DC Grid Using a Dual-Inverter Drive

Abstract: Existing integrated chargers are configured to charge from single- or three-phase ac networks. With the rapid emergence of dc grids, there is growing interest in the development of high-efficiency low-cost integrated chargers interfaced with dc power outlets. This paper introduces a new integrated charger offering electric vehicle fast charging from emerging dc distribution networks. In absence of a dc grid, the charger can alternatively be fed from a simple uncontrolled rectifier. The proposed charger leverages the dual-inverter topology previously developed for high-speed drive applications. By connecting the charger inlet to the differential ends of the traction inverters, charging is enabled for a wide battery voltage range previously unattainable using an integrated charger based on the single traction drive. An 11-kW experimental setup demonstrates rapid charging using constant current control and energy balancing of dual storage media. To minimize the harmonic impact of the charger on the dc distribution network, a combination of complementary and interleaved switching methods is demonstrated.

Non-isolation type single-magnetic-core three-port direct current converter

Abstract: The invention discloses two kinds of non-isolation type single-magnetic-core three-port direct current converters Each of the two kinds of the converters comprises an input source port, a battery port, a load port, a first switching tube, a second switching tube, a third switching tube, a first diode, a second diode, a third diode, a filter capacitor and a filter inductor, and has five kinds of working patterns, wherein the four working patterns have three working modes According to the converters provided by the invention, the converters are connected with the corresponding input voltage sources, the loads and the batteries; single-stage energy conversion is performed among the ports; the converters have multifunctional unified energy management modes and higher efficiency; the same working pattern can be carried out by different working modes, so that limitation to the port voltage is low; and in addition, the converters are wide in operating range and flexible in working modes

An Integrated Bidirectional Three-Phase AC Charger for Vehicle Applications with Buck-Boost Capability

Abstract: On-board integrated chargers for electric and plug-in hybrid electric vehicles are advantageous in that they have the potential to significantly reduce the external charging infrastructure requirements for charging a vehicle. This is made possible by re-using the power electronics and cooling systems already on-board the vehicle for charging. The disadvantages of on-board chargers, however, include added weight, volume and cost to the vehicle. In this paper, a novel on-board integrated three-phase ac charger topology is presented with buck-boost and vehicle-to-grid charging capability with minimum impact to the vehicle. Through use of a current source converter front-end, an input filter, a polarity inversion module and a differentially connected dual-inverter drive, a charger of three-port structure is realized with level-3 charging capability. This paper focuses on developing the operating principles of this novel topology. The operating principles are validated through PLECS simulations.

Analysis of a Dual Input DC-DC Converter Topology Based on SEPIC Configuration

Abstract: Multi input converters are more reliable, efficient and has less complex structure compared to conventional methods of integrating various sources using multiple number of single input DC-DC converters. A dual input DC-DC converter is presented in this paper which can accommodate two different energy sources, two inductors, three power switches. Various modes of operation of the converter are discussed in this paper with the detailed analytical waveforms and equivalent circuits. The software simulation of the presented converter has been carried out using MATLAB/ Simulink® platform for the boost operation of the converter. A hardware prototype of the converter is also developed to check the feasibility of the converter performance in the experimental platform.