Switching voltage regulator with low current trickle mode

Details Switching voltage regulator with low current trickle mode Switching voltage regulator with low current trickle mode

2007-12-04

2007-12-04

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S225000, C323S284000

Reexamination Certificate

active

11376929

ABSTRACT:
For load currents greater than a threshold current, the voltage regulator operates in a conventional manner by fully turning on and off one or more switching transistors at a duty cycle necessary to maintain the output voltage a regulated voltage. Upon a load current below a threshold being detected, a controller stops the switching of the transistor(s) and applies a reduced drive signal to the high side transistor so as to apply a constant trickle current to the load. Unnecessary components are shut down to save power. When the output voltage falls below a threshold, the normal switching routine is resumed to recharge the regulator's output capacitor to a certain level, and the regulator once again enters the light load current mode. By not completely shutting down the transistors at light load currents, as in done in a conventional intermittent-operation mode, there is lower power loss by less frequent switching of the transistor(s).

REFERENCES:
patent: 5481178 (1996-01-01), Wilcox et al.
patent: 5773966 (1998-06-01), Steigerwald
patent: 6150798 (2000-11-01), Ferry et al.
patent: 6452368 (2002-09-01), Basso et al.
patent: 6621256 (2003-09-01), Muratov et al.

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