Abstract: In order to improve the dynamic performance of the current controller, this paper presents a non-delay control scheme for a single-phase pulse width modulation (PWM) converter. Most of the vector control methods for a single-phase converter require imaginary the orthogonal current components. However, there exist time delay issues in the generation of the fictitious orthogonal current components by the traditional orthogonal signal generator (OSG), which may deteriorate the dynamic performance of the current controller. In this paper, a fast OSG algorithm has been proposed to solve the relevant time delay problems. Firstly, the mathematical model of the single-phase PWM converter in the rotating dq coordinate system is established. Secondly, considering the problem that the vector control cannot be directly implemented in the single-phase system, several traditional OSG algorithms are introduced. Then a non-delay orthogonal current generation algorithm is proposed and its implementation block diagram is given. Finally, the proposed algorithm is compared with the traditional OSG algorithm by simulation and experiment. The simulation and experimental results verify the effectiveness and feasibility of the proposed algorithm.