Cun Hu

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In this paper, a simple method to extract regions of interest (ROI) from images is proposed. In the field of image processing, intensity, color and orientation are commonly used features for saliency map generation in most visual attention model. However, texture feature can contribute to the guidance of attention in a bottom-up model. We consider texture(More)
The novel cable-driven anthropomorphic-arm manipulator (CDAM) mentioned in this paper is a 7-DOF hybrid redundant mechanism which fuse the advantages of redundant manipulator and cable-driven mechanism. This paper focuses on the stiffness of the CDAM and gives the Cartesian stiffness matrix calculation process. The process can be divided into three steps:(More)
The performance of stepper motor is closely related to the driving method. Stepper motor subdivision drive is used to transform Servo system of CA6140 lathe. With this method, it can reduce the motor step angle, thereby decreasing machine pulse equivalent to improve the precision of servo control and precision machining.
A new modulation method is proposed to solve the unbalancing problem of neutral-point potential in the DC side in three-level (3L) three-phase neutral-point-clamped (NPC) voltage source inverters. Based on properties of current balancing of three phases and redundant short vectors, different short vectors have different time distribution factors, which can(More)
With the rapid development of photovoltaic (PV) power generation, technology of the grid-connected photovoltaic system becomes an important part of the photovoltaic power generation. Based on this background, grid connection techniques of T-Type three-level grid-connected inverter with an LCL filter is studied in this paper. The subject combines SPWM(More)
A photovoltaic controller is a converter which can transform the energy generated by photovoltaic cells and control the battery charging and discharging. The maximum power point tracking (MPPT) technology can maximize the efficiency of photovoltaic cell and effectively improve the efficiency of photovoltaic power generation system. The single-phase buck(More)
A bi-directional DC-DC converter is a dual-quadrant DC-DC converter, which is a typical "dual-use" in one device. The concept and application of bi-directional DC-DC converter are introduced in this paper. Hardware of the system mainly includes the main control circuit, sampling circuit, auxiliary power supply circuit, and the Buck/Boost chopper circuit.(More)
The photovoltaic (PV) grid-connected power generation has become an important direction of energy development. A grid-connected inverter is the key equipment in the PV grid-connected system. The efficiency and performance of the PV grid-connected inverter mainly depend on its topology and control technology. The PI controller has good dynamic and(More)
The operating theory of single-phase two-level pulse width modulation (PWM) rectifiers is analyzed and the mathematical model is established. In order to reduce switching losses, a single-phase two-level space vector pulse width modulation (SVPWM) strategy and a single-phase two-level carrier PWM strategy with zero-sequence voltage injection are presented(More)
Pulse-width-modulation (PWM) method is a crucial technique to construct multilevel converter. A hybrid PWM combining the merits of both space vector PWM (SVPWM) and selective harmonic elimination PWM (SHEPWM) is proposed for the five-level active neutral-point clamped converter. SVPWM can lead to high DC voltage utilization and low ripple current at low(More)