Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Reexamination Certificate
2006-10-31
2006-10-31
Patel, Rajnikant B. (Department: 2838)
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
C363S097000, C363S016000, C307S066000
Reexamination Certificate
active
07130202
ABSTRACT:
This invention relates to a method for driving converts of an uninterrupted power supply (UPS), characterized in that the generating circuit of driving signal for power factor correction generates two driving signals (DRV1, DRV2) to drive the switch transistors (Q9, Q11) of the positive and negative power factor correction branch respectively, the holding and shifting circuit of driving pulse-width after the generating circuit of driving signal for power factor correction holds and shifts the pulse-width of the two driving signals, and drives the switch transistors (Q10, Q12) parallel to the aforesaid switch transistors in the positive and negative power factor correction branch respectively. Since a circuit for holding the pulse-width is introduced, the currents of the switch transistors of the two parallel boost converters are maintained substantially the same, thereby improving the reliability of the uninterrupted power supply system. As a result, this invention can be widely used in any application where a UPS is desired.
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patent: 4980812 (1990-12-01), Johnson, Jr. et al.
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patent: 6069412 (2000-05-01), Raddi et al.
‘Input Current Ripple Cancellation in Synchronized, Parallel Connected Critically Continuous Boost Converters’ Michael S. Elmore, Celestica Power Systems, Endicott, NY, 1996 IEEE, pp. 152-158.
‘Power-Factor Correction with Interleaved Booost Converters in Continuous-Inductor-Current Mode’ Balogh et al., 1993 IEEE, pp. 168-174.
‘Double PWM Control for Unity-Power-Factor Converters’ Ohnuki et al., Tokyo Denki University, Department of Applied Electronic Engineering, Japan, pp. 1-7.
Emerson Network Power Co., Ltd.
Ladas & Parry LLP
Patel Rajnikant B.
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