Switching regulator circuits

Details Switching regulator circuits Switching regulator circuits

2007-04-16

2009-10-20

Patel, Rajnikant B (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S282000, C363S021170

Reexamination Certificate

active

07605574

ABSTRACT:
A current-mode switching regulator including at least: an inductor; a main switch for controlling the current flow through the inductor; and a feedback control circuit for operating the main switch cyclically and to vary a duty cycle of the main switch so as to substantially maintain an output voltage of the regulator at a desired level. The feedback control circuit further includes slope compensation circuitry adding slope compensation to a signal representing the inductor current prior to the slope compensated signal being compared to the fed-back output error voltage. The regulator further includes current limiting circuitry for controlling the main switch responsive to a current limit reference signal, the current limit circuitry including adjustment circuitry for adjusting the current limit reference signal in response to the duty cycle of more than one previous cycle so as to limit current in the inductor irrespective of the output voltage and to a value which, in the steady state, is substantially independent of the duty cycle.

REFERENCES:
patent: 5305192 (1994-04-01), Bonte et al.
patent: 5687066 (1997-11-01), Cook, II
patent: 5717322 (1998-02-01), Hawkes et al.
patent: 6498466 (2002-12-01), Edwards
patent: 6611131 (2003-08-01), Edwards
patent: 2004/0105284 (2004-06-01), May
“Current Mode Control”, Venable Technical Paper #5, pp. 1-11, Venable Industries.
Robert W. Erickson et al., Fundamentals of Power Electronics, 2nd Ed. Univ. of Colorado, Boulder Colorado, pp. 439-449 (2001).

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