Expansion of reconstruction areas for current measurement using three shunt resistors in three leg two‑phase inverters

Hye-In Jeong; Sang-Hoon Kim

Expansion of reconstruction areas for current measurement using three shunt resistors in three leg two‑phase inverters

Hye-In Jeong

Sang-Hoon Kim

Vol. 22, No. 12, pp. 2048-2055, Dec. 2022

10.1007/s43236-022-00534-7

Three shunt resistors

Three leg inverter

Two-phase motor

Expansion of reconstruction areas

CPWM

DPWM

Abstract

When driving two-phase motors using three leg inverters, phase currents can be measured using shunt resistors inserted between a low-side switch on each leg of the inverter and the negative DC-link terminal. The current measuring scheme using shunt resistors on only two inverter legs has a limited current measurement capability. In addition to this two shunt scheme, the three shunt scheme can reconstruct immeasurable currents utilizing a shunt resistor located on a neutral leg of the inverter. Thus, the three shunt scheme can widen the areas where the currents can be measured when compared to those in the two shunt scheme. However, this scheme cannot appropriately reconstruct currents within operating areas where a sufficient turn-on time for the low-side switches cannot be guaranteed, which results in increased torque ripple of two-phase motors and decreased DC voltage utilization of inverters. In this paper, a simple technique for expanding the reconstruction areas of the currents in the three shunt scheme is proposed. The proposed technique can expand the reconstruction areas by utilizing DPWM (discontinuous pulse width modulation) that can secure the turn-on time of the low-side switches longer than CPWM (continuous PWM), thereby improving the DC voltage utilization.

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Cite this article

[IEEE Style]

H. Jeong and S. Kim, "Expansion of reconstruction areas for current measurement using three shunt resistors in three leg two‑phase inverters," Journal of Power Electronics, vol. 22, no. 12, pp. 2048-2055, 2022. DOI: 10.1007/s43236-022-00534-7.

[ACM Style]

Hye-In Jeong and Sang-Hoon Kim. 2022. Expansion of reconstruction areas for current measurement using three shunt resistors in three leg two‑phase inverters. Journal of Power Electronics, 22, 12, (2022), 2048-2055. DOI: 10.1007/s43236-022-00534-7.