Title :
High precision AC/AC power supply unit based on DSP controlled PWM inverter
Author :
Ádám, Tihamér ; Ajtonyi, István ; Tóth, Ferenc
Author_Institution :
Dept. of Autom., Univ. of Miskolc, Hungary
Abstract :
The paper introduces a precision switching mode AC/AC power supply unit, that has been developed for calibration of current transformers. The device is fed by the 220 V 50/60 Hz mains, the output power is 3 kVA, and the output frequency is 50 or 60 Hz, which can be selected from the program. Large current control ratio, low level harmonic content of the output current, high accuracy, high resolution, high precision are the most important demands. Data transfer interface between the device and a supervisory computer is also necessary. Due to the large control ratio a two-stage controller is used. The controllable rectifier utilises changeable DC voltage level for the single-phase controlled PWM inverter. The PWM inverter carries out the DC/AC transformation and the fine adjustment of the output voltage. The harmonics contents of the inverter output current are reduced by an LC lowpass filter. The output voltage signal is perfect sinusoidal, because the PWM waveform is generated by a high performance, high accuracy 32-bit floating-point DSP
Keywords :
AC-AC power convertors; PWM invertors; calibration; current transformers; digital control; digital signal processing chips; electric current control; harmonics suppression; insulated gate bipolar transistors; low-pass filters; power conversion harmonics; power supplies to apparatus; switching circuits; 220 V; 32-bit floating-point DSP; 50 Hz; 60 Hz; LC low-pass filter; PWM waveform; changeable DC voltage level; controllable rectifier; current control; current transformers calibration; data transfer interface; harmonics current reduction; high accuracy; high precision switching mode AC/AC power supply; high resolution; inverter output current; large current control ratio; low level harmonic content; output current; output frequency; output power; output voltage adjustment; single-phase controlled PWM inverter; sinusoidal output voltage signal; two-stage controller; Calibration; Current transformers; Digital signal processing; Frequency; Power generation; Power harmonic filters; Power supplies; Pulse width modulation; Pulse width modulation inverters; Voltage control;
Conference_Titel :
Power Conversion Conference, 2002. PCC-Osaka 2002. Proceedings of the
Conference_Location :
Osaka
Print_ISBN :
0-7803-7156-9
DOI :
10.1109/PCC.2002.998137
