Overcurrent-protected switching-mode power supply

Details Overcurrent-protected switching-mode power supply Overcurrent-protected switching-mode power supply

2011-07-26

2011-07-26

Han, Jessica (Department: 2838)

Electric power conversion systems

Current conversion

Including automatic or integral protection means

C323S285000, C361S018000

Reexamination Certificate

active

07986537

ABSTRACT:
A DC-to-DC converter having an active switch connected between a pair of DC input terminals via the primary winding of a transformer whose secondary winding is connected to a pair of DC output terminals via a rectifying and smoothing circuit. Operating under the control of an output voltage detector circuit, a switch control signal generator rapidly turns the active switch on and off so as to keep the DC output voltage constant. For overcurrent protection, a current detect resistor is connected in series with the active switch for providing an uncorrected current detect signal indicative of the current flowing through the active switch. An overcurrent protector generates, in response to a clocked ramp voltage, a correction voltage which builds up with time during each conducting period of the active switch. The correction voltage is subtracted from the uncorrected current detect signal to provide a corrected current detect signal. The switch control signal generator is caused to turn off the active switch when the corrected current detect signal rises to an overcurrent threshold.

REFERENCES:
patent: 5596465 (1997-01-01), Honda et al.
patent: 7339804 (2008-03-01), Uchida
patent: 7577003 (2009-08-01), Nakamura
patent: 2004/0169977 (2004-09-01), Kotula
patent: 2007/0291516 (2007-12-01), Nakamura et al.
patent: 2004-40856 (2004-02-01), None
patent: 2005-184882 (2005-07-01), None

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