In this paper, analysis and design of a three phase isolated Cuk based power factor correction (PFC) converter has been proposed. The proposed converter is operated in discontinuous output inductor current mode (DOICM) to achieve PFC at ac input. This avoids the inner current control loop which further eliminates the sensing of current. This makes the system more reliable and robust. The converter requires only one simple voltage control loop for output voltage regulation and all the power switches are driven by the same gate signal which simplifies the gate driver circuit. The detailed operation of the converter and design calculations are presented. And also a small signal model of the converter by using CIECE approach is presented to aid the controller design. The experimental results from a 2-kW laboratory prototype with 208-V line-to-line input voltage, 400-V output voltage are presented to confirm the operation of the proposed converter. An input power factor of 0.999, an input current total harmonic distortion of as low as 4.06% and a high conversion efficiency of 95.1% are achieved from laboratory prototype.

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Three Phase Single Stage Isolated Cuk based PFC Converter
ABSTRACT:
In this paper, analysis and design of a three phase isolated Cuk based power factor correction
(PFC) converter has been proposed. The proposed converter is operated in discontinuous output
inductor current mode (DOICM) to achieve PFC at ac input. This avoids the inner current control
loop which further eliminates the sensing of current. This makes the system more reliable and
robust. The converter requires only one simple voltage control loop for output voltage regulation
and all the power switches are driven by the same gate signal which simplifies the gate driver
circuit. The detailed operation of the converter and design calculations are presented. And also a
small signal model of the converter by using CIECE approach is presented to aid the controller
design. The experimental results from a 2-kW laboratory prototype with 208-V line-to-line input
voltage, 400-V output voltage are presented to confirm the operation of the proposed converter.
An input power factor of 0.999, an input current total harmonic distortion of as low as 4.06% and
a high conversion efficiency of 95.1% are achieved from laboratory prototype.
KEYWORDS:
1. Three phase power factor correction (PFC)
2. Isolation
3. Cuk converter
4. Discontinuous conduction mode (DCM)
5. AC-DC converters
SOFTWARE: MATLAB/SIMULINK

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CIRCUIT DIAGRAM:
Fig. 1. (a) Single phase isolated Cuk PFC converter; (b) Proposed structure of the three phase isolated Cuk
converter.

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EXPERIMENTAL RESULTS:
Fig. 2. Experimental waveforms at 1kW output power: (a) input voltages of each phase (50V/div); (b) input currents
of each phase and output voltage (2.0A/div, 200V/div); (c) input voltage (50V/div) and input current (2.0A/div) of
each phase; (d) input current harmonic spectrum.

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Fig.3. Experimental waveforms at 1kW output power: (a) input voltage and voltage across capacitor 𝑐1𝑎
(100V/div); (b) output voltage and voltage across capacitor 𝑐2𝑎 (100V/div); (c) one phase transformer primary and
secondary currents (5.0A/div each); (d) output currents of each module (5.0A/div); (e) transformer primary voltages
of each phase (200V/div); (f) voltage across each switch (200V/div).

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Fig. 4. (a) The experimental output voltage (200V/div), output current (2.0A/div) and input current (5.0A/div) for
load power disturbance from 0.8 kW to 1.0 kW; (b) The experimental output voltage (100V/div), input voltage
(100V/div) and input current (5.0A/div) for phase input voltage disturbance from 100 V to 115 V.
CONCLUSION:
In this paper, a three phase isolated Cuk converter based power factor correction rectifier
operating in discontinuous output inductor current mode (DOICM) is presented. Due to the large
size input inductor filter, the proposed converter does not require an additional input filter. The
steady state operation of the converter and each component design have been given in detail. It is
shown that by operating the converter in DOICM, the input currents are sinusoidal and in phase
with input voltages. Subsequently, it does not require inner current control loop and eliminates
the current sensors which reduces the system cost and increase the reliability. Another advantage
is that the converter works with zero current turn off in the output diode which eliminates the
reverse recovery losses of diodes. To aid the controller design, detailed small signal model of the

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converter by using CIECE approach is presented. A simple voltage control loop with only one
output voltage sensor is used to regulate the output voltage.
An experimental laboratory prototype of 2 kW is designed and built to confirm the operation of
the proposed converter. The experimental results confirms the analysis and operation of the
converter. A high efficiency of 95.1% and an input current THD as low as 4.06% are achieved
with the developed laboratory prototype.
REFERENCES:
[1] Limits for Harmonic Current Emissions (Equipment Input Current <16A Per Phase),
IEC/EN61000-3-2, 1995.
[2] IEEE Recommended Practices and Requirements for Harmonics Control in Electric Power
Systems, IEEE Std. 519, 1992.
[3] D. Gauger, T. Froeschle, L. Illingworth and E. Rhyne, "A Three-Phase Off-Line Switching
Power Supply with Unity Power Factor and Low TIF," Telecommunications Energy Conference,
1986. INTELEC '86. International, Toronto, Canada, 1986, pp. 115-121.
[4] BREWSTER, R.F., and BARRET, A.H., “Three-phase AC to DC voltage converter with
power line harmonic current reduction,” US Patent 4143414, 6th March, 1979.
[5] D. Chapman, D. James and C. J. Tuck, "A high density 48 V 200 A rectifier with power
factor correction-an engineering overview," Proceedings of Intelec 93: 15th International
Telecommunications Energy Conference, Paris, 1993, vol. 1, pp. 118-125.