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This paper presents the project and the implementation of a high frequency isolation pre-regulator for applications in UPS systems using an easy implementation control technique, which uses fewer sensors and has good performance (>90%), named self-control. The technique was carried out using a DSPIC from MICROCHIP. A 1 kW prototype was assembled and its experimental waveforms will be presented...
The theory and simulation of a base line automatic frequency control, AFC, are proposed in this paper. The AFC is used to track the voltage controlled temperature compensated crystal oscillator (VCTCXO) drift. It is required to lock on to a valid signal at some frequency offset of a pre-determined range. This method of producing a frequency estimate that is computationally more expensive is introduced...
A delay-locked loop of multi-band selector with wide-locking range and low power dissipation is presented. The architecture of the proposed delay-locked loop consists of phase frequency detector, charge pump, band selector, multi-control delay line, and start-up circuit. The multi-band selector is used to extend operation frequency of delay-locked loop by switching the multi-control delay line. The...
This paper proposes a dead-time compensation method with a disturbance observer and a current controller for V/f control. Dead-time compensation is very important to improve motor drive performances in the low speed region. The proposed compensation method is composed in the d-q rotational frame. The ripple of the d-axis current caused by the dead-time is suppressed by an auto current regulator, the...
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