Sliding Mode Controller (SMC) For Sinusoidal Ripple Current (SRC) Charge of Li-ion Battery

Hajisadeghian, Hossein; Birjandi, Ali Akbar Motie; Nahavandi, Ramin

doi:10.1109/pedstc.2019.8697255

Cited by 3 publications

(1 citation statement)

References 18 publications

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“…Conventionally, AC current is injected to rechargeable batteries using linear circuits which work offline (the batteries are disconnected from the applications) [5,6]. Recently, power converters are being used to inject AC current to rechargeable batteries which can be operated either offline or online (the battery is connected to the applications) [1][2][3][4][7][8][9][10][11][12][13]. A buck converter topology was used to inject AC current on top of DC charging current in [9].…”

Section: Introductionmentioning

confidence: 99%

Versatile AC Current Control Technique for a Battery Using Power Converters

Islam

Park

2021

Batteries

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Although a battery is a DC device, AC current is often necessary for testing, preheating, impedance spectroscopy, and advanced charging. This paper presents a versatile control technique to inject AC current to a battery. Synchronous buck and H-bridge topologies are operated in bidirectional mode and controlled by uni-polar and bi-polar pulse width modulation techniques for the AC current injection. The input and output passive circuits are specially designed considering AC current and the properties of the battery. A controller is proposed considering a small internal impedance, small AC ripple voltage, and variable DC offset voltage of a battery. The controller is capable of maintaining stable operation of AC current injection in two power quadrant within a small DC voltage boundary of a battery. The controller is comprised of a feedback compensator, a feedforward term, and an estimator. The feedback gain is designed considering the internal impedance. The feedforward gain is designed based on estimated open circuit battery voltage and input voltage. The open circuit voltage estimator is designed based on filters and battery model. For validation, AC current is injected to a Valence U-12XP battery. The battery is rated for 40 Ah nominal capacity and 13.8 V nominal voltage The controller successfully injected AC current to a battery with +10 A, 0 A and −10 A DC currents. The magnitude and frequency of the AC current was up to 5 A and 2 kHz respectively.

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