Power supply and printing machine containing same

Details Power supply and printing machine containing same Power supply and printing machine containing same

1999-05-26

2000-01-25

Wong, Peter S.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363 45, 363 54, 363 85, 363128, 323901, 323908, H02M 112, H02M 542, H02M 7155

Patent

active

060184736

ABSTRACT:
A power supply includes a diode bridge rectifier. The diode bridge rectifier output provides direct current to a primary capacitor. A current-limiting resistor is connected in series with the rectifier output and the primary capacitor. The current-limiting resistor acts to limit inrush current to the primary capacitor when the power supply is turned on. A triac is coupled in parallel with the current-limiting resistor. When charged, the primary capacitor provides a primary signal and primary current to a switched load, which includes a first winding of a transformer and a load switching device. The transformer also has a second winding connected in series with the triac's gate terminal. When the primary signal reaches a satisfactory level, the load switching device switches the load, causing current transients in the first winding. The first winding current transients, in turn, induce current in the second winding and in the triac gate terminal. The triac thus becomes energized and short-circuits the current-limiting resistor. The second winding also provides current to a diode rectifier which, in turn, charges an auxiliary capacitor. When charged, the auxiliary capacitor provides an auxiliary signal and auxiliary current. The auxiliary current and corresponding auxiliary return current also flow through the triac gate terminal, thereby further energizing the triac.

REFERENCES:
patent: 4954765 (1990-09-01), Hu
patent: 5343122 (1994-08-01), Sugimori et al.
patent: 5383081 (1995-01-01), Nishikawa
patent: 5385365 (1995-01-01), Lee
patent: 5574632 (1996-11-01), Pansier
patent: 5619127 (1997-04-01), Warizaya
patent: 5715154 (1998-02-01), Rault
patent: 5886892 (1999-03-01), Radley et al.

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