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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...
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...
Droop control is basic control method for load current sharing in dc microgrid applications. But the line impedance disturb the load current sharing in the droop control system. To reduce the influence of line impedance, large droop gain is needed but that increase the dc voltage deviation. The dc voltage deviation can be compensate by hybrid control method. In the steady state, the dc voltage is...
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...
Dc microgrids including grid-tied inverter, energy storage system, and distributed generations have the advantage of high efficiency as compared to the ac system. Droop control has been realized to suppress the current mismatching among distributed sources. However, the conventional droop control involves distribution loss due to the line impedance. In this paper, a novel droop control is proposed...
This paper proposes an improved cell balancing circuit for fast equalization among the lithium ion (Li-ion) batteries. Usually, the battery cell balancing circuit uses the sensor to estimate the accurate SOC (state of charge) of each battery cell and to operate the switch selectively [1], but it makes the system bulky and expensive. A simple voltage sensorless charge balancing circuit has been proposed...
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