Distortion-Free CV/CC AC Power Supply Having the Unity Input Power Factor by the Use of Variable Capacitance Devices

Abstract

A new CV (Constant-Voltage) CC (Constant-Current) ac power regulator is proposed. Our original Variable Capacitance Device of linear reactance device is utilized in the power stage. This device makes almost no distortion. In this circuit, a sinusoidal output voltage and a high efficiency can be obtained. For the purpose of output voltage/current control and input power-factor correction, two Variable Capacitance Devices were adopted. Two dc-dc converters were used for high-speed driver of these  devices. The unity input power factor can be obtained all over the constant-voltage region and the constant-current region. Input current of the proposed power supply becomes almost zero at no load and at short-circuit load.

Keywords

• Variable Capacitance Device; ac power supply; no distortion; unity input power factor; dc-dc converter

References

1. T. Hasumi, Applications of Ferroresonance, Ohm-sha, Tokyo, 1952. (in Japanese)
2. C. Hayashi, Nonlinear Oscillations in Physical Systems, McGraw-Hill, New York, 1964.
3. R. J. Kakalec, “A Feedback-Controlled Ferroresonant Voltage Regulator,” IEEE Transactions on Magnetics, Vol. MAG-6, pp. 4-8, March 1970.
4. A. Katsuki, H. Iwata, and T. Matsui, “Distortion-Free Regulated AC Power Supply Using Variable Capacitance Device,” Proceedings of PCC’97 (The 2nd Power Conversion Conference), pp. 347-354, August 1997.
5. K. Harada, A. Katsuki, M. Fujiwara, H. Nakajima, and H. Matsushita, “Resonant Converter Controlled by Variable Capacitance Device,” IEEE Transactions on Power Electronics, Vol. 8, No. 4, pp. 404-410, October 1993.
6. A. Katsuki, S. Ishimaru, and T. Arai, “Power-Factor- Corrected Distortion-Free Regulated AC Power Supply Using Variable Capacitance Devices,” Proceedings of INTELEC’99 Telecommunications Energy Conference), No. 31-43, June 1999. 21st International
7. A. Katsuki and T. Arai, “Distortion-Free Constant- Voltage Constant-Current AC Power Supply Using Variable Capacitance Device,” Proceedings of IPEC’00 (The 4th International Power Electronics Conference), pp. 1704-1710, April 2000.
8. A. Katsuki, T. Arai, and M. Matsushima, “Power- Factor-Corrected Distortion-Free Constant-Voltage Constant-Current AC Power Supply Using Variable Capacitance Devices,” Proceedings of PCC’02 (The 3rd Power Conversion Conference), pp. 933-940, April 2002.