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The rotors and stators of motors (or generators) as well as the cores of transformers are produced by progressive stamping coupled with stacking. Failure in stacking leads to rotor/stator/core misalignment during winding or loss of lamination after crashes. Proper embossing depth of cylindrical spots and clearance between the punch and die are essential for achieving high-quality lamination. In this...
The position sensor-less brushless DC (BLDC) motor driver was proposed in this work. The three-phase BLDC fan motors are utilized for cooling the computer products. Generally, the Hall sensor is used to extract the rotor position information. However, the sensor component is very sensitive to heat and noise signals. Therefore, the sensor-less control technique was developed. The proposed sensor-less...
A varying-frequency control Flyback rectifier for LED driving in Boundary-Conduction Mode (BCM) is presented. Comparing with Discontinuous-Conduction Mode, BCM has the advantages like smaller coupling inductor current, less current stress for circuit component, slight output current ripple, and higher power factor performance. For lower output application circumstance, the boundary conduction mode...
A constant current output Flyback converter with power factor correction used for LED driving is presented in this paper. The inductor voltage detection method is applied and acquired the inductor voltage to generate the control signal. Based on this design principle, the inner loop of input current shaping is eliminating, the input voltage sensing and multiplier are also not necessary. The simulation...
This paper presents a brushless DC motor sensorless driver with sine pulse width modulation signal. For speed control, the current feedback is included to the closed loop control strategy to decrease the power consumption and increase the motor performance. In addition, the sine wave phase-changing signal is closed with a set of specific electrical angles in the zero crossing point to detect the back...
This paper presents a LED driver circuit based on single-stage Flyback converter with power factor correction. Voltage following control and nonlinear carrier control are applied to constant current mode Flyback converter which is combined with constant current driver technique. By designing the outer loop to stabilize the output voltage and the inner loop to shape input current waveform, that makes...
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