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This paper proposes a predictive current mode control boost PFC converter adopting a novel active part switching technique to achieve both robust current shaping control to disturbances and high power conversion efficiency. This strategy consists of controlling the switching stop angle near the peak of the input voltage through the output voltage control and controlling the switching stop period near...
This paper proposes a novel type of active cell balancing circuit using the multi-winding transformer. This scheme is applied auxiliary circuit for controlling the charging and discharging current of the Lithium-ion battery. Conventional schemes using a multi-winding transformer require a large magnetizing inductance to satisfy the allowable charging and discharging current of the battery cell. In...
A battery tester is an important equipment for battery manufacturers to understand several characteristics of a lithium-ion battery including dc and/or over-discharge properties. This paper proposes a low cost battery tester that can discharge the battery to zero voltage under a minimized current ripple to evaluate the characteristics of a lithium-ion battery. The circuit of the proposed tester consists...
In this paper, a LLC resonant converter battery charger using adaptive turn ratio scheme is proposed to achieve high efficiency and wide ranged output voltage. In the proposed scheme, the high frequency transformer of the LLC converter has an adaptively changed turn ratio by the auxiliary control circuitry. As a result, the optimal converter design with a large magnetizing inductance is easily achieved...
The typical conventional battery charger requires the two separated voltage and current compensators to achieve both the constant current and the constant current (CC-CV) charging profile. This paper proposes a single integrated voltage-current compensator of the LLC resonant converter for lithium-ion battery charger applications. The proposed compensator is designed to provide a smooth and reliable...
In this paper, the design consideration of the dual control scheme of a LLC resonant converter for a Li-ion battery charger is proposed to stabilize operation during whole charging process. The theoretical approach of constant-current and constant-voltage controller is presented when considering the nonlinear property of a Li-ion battery under wide ranged output voltage. By applying the extended describing...
In this paper, A novel control scheme of LLC resonant converter is proposed to maximize energy harvest of photovoltaic resources by adapting an integrated transformer with variable magnetizing inductance adaptively. The proposed resonant converter changes its magnetizing inductance according to the PV panel operating condition, and thus it is possible to achieve a minimum circulating energy under...
Deviation of power frequency can greatly impact power system reliability, power quality and economic efficiency. This paper proposes the frequency control of energy storage system based on hierarchical cluster structure. A central agent named by power management system (PMS) contracts with utility for providing the frequency regulation. The agent also manages the whole cluster structure and balances...
Flexures are widely used in precision machines since they offer frictionless, particle-free, and low maintenance operation, and they provide extremely high resolution. A large displacement precision XY positioning stage is designed by using cross strip flexure joints. An over-constrained mechanism is used to incorporate symmetry to cancel out the effects of center shifting in large-motion flexures...
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