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Joined: 05-Apr-2012
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Quote arch02 Replybullet Topic: need to make the control section of UPS!!
    Posted: 08-Apr-2012 at 9:03pm
need to make the control section of UPS..!!
please help..!!!

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Quote skumar Replybullet Posted: 09-Apr-2012 at 10:12pm
Universal control scheme of ASIC

The above figure shows the universal control block diagram of the ASIC (application specific integrated circuit). It contains seven PI-controllers in total. The pulse width modulation generates the signals for six inverter legs. This allows for three independent four-quadrant DC-inverters being used for a three-phase output inverter. The current controllers operate in two modes: for the output inverter three current controllers are used to control the three phases independently. For the rectifier only two controllers are used; the third phase is calculated at the output voltage level. The voltage controllers are only used for output inverter operation. They can be bypassed at the rectifier mode.

Some additional circuitry was included. The measurement of the phase difference for the PLL-control of the line frequency is supported by the ASIC using phase angle captures functions. To support the microcontroller to determine the effective output voltage and current load the integrated squares of the measured values are calculated during a period of the sine wave frequency.

The repetition cycle of all calculations performed by the ASIC is the switching frequency of the inverter legs. This frequency normally amounts to 20 kHz. At the beginning of the cycle the A/D-conversion is started. The ASIC calculates the references and the UD-voltage controller. After at most 15 s the A/D-conversion is ready and the calculation of the controllers starts being performed in 10 s for all six PI-algorithms. New PWM-values are given to the modulator at the middle of the switching cycle. In the remaining second half of the cycle the ASIC performs the calculation of sum of squares of the measured values.

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