Compared with conventional space vector pulse width modulation (SVPWM), discontinuous pulse width modulation (DPWM) technique is esteemed for lower switching losses and more flexible sampling options. Moreover, the three-phase current can be reconstructed by sensing the DC bus current with DPWM technique to decrease the application cost. However, there are still some issues like insufficient current sensing time window existed in DPWM applications. This paper introduces a novel single-shunt current sensing technique with phase-shifted algorithm to solve the immeasurable area problem of DPWM technique. The relationship between phase-shifted PWM and minimum sampling time is thoroughly analyzed, and the issue of immeasurable area in current reconstruction is solved through phase-shifted output. The proposed technique is experimentally validated on a permanent magnet synchronous motor (PMSM) platform to demonstrate the feasibility of single-shunt current sensing for three-phase current reconstruction of DPWM. The result demonstrates that the single-shunt current sensing technology of DPWM can greatly reduce the switching losses and save application cost.