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This paper presents a dual-band 2×2 WiFi transceiver in 28nm bulk CMOS. Achieved receiver and transmitter EVM floor at 5GHz for 160MHz per channel are −35dB and −33dB, respectively. The 2.4GHz integrated PA provides 26.5dBm saturated output power while its 5GHz counterpart delivers 26dBm. The 2.4GHz receiver features mixer first architecture while the transmitter includes a 2nd harmonic notch for...
In this paper, a systematic approach for reliability assessment of electrolytic capacitor-free LED drivers is developed to investigate the failure rate of MOSFETs in the drivers. An original fly-back driver with electrolytic capacitor and two modified electrolytic capacitor-free drivers are studied, and their performances are compared. Due to LED lumen depreciation during operation, current of the...
This paper presents an adaptive dc-link voltage controller for the purpose of decreasing the operating dc-link voltage in a back-to-back converter system. An outer loop to control the maximum modulation (Mmax) index is added to the conventional dc-link voltage controller, and hence the system can online adapt its dc-link voltage reference based on the system operating state. Furthermore, the relationship...
This paper introduce a seven level grid connected system based on the TRSPWM strategy and a Quasi PR current controller has a good output performance with a fast response and compensation for the low order harmonics in grid. With the multilevel output voltage and a high tracking current strategy with a low-order harmonic compensator, the grid connected system could operate properly in a polluted grid...
In this paper, a kind of zero-crossing distortion (ZCD) generated in the grid-connected current of a single-phase grid-connected inverter with unipolar hysteresis current control is investigated. By establishing the mathematical model of the grid-connected inverter around the zero-crossing points (ZCPs), the reason for causing the current ZCD is presented. It is ascribed to the slope of the actual...
Decoupled double synchronous reference frame Phase-locked loop (DDSRF-PLL) is able to detect the phase angle of positive sequence when the three-phase voltages are unbalanced and distorted. In this paper, it is applied to the compensation current detection algorithm of shunt active power filter (SAPF) to replace a conventional PLL. Simulation results indicate that the compensation performance could...
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