Patent ID: 8058812

Claim:
A buck-mode boost converter comprising: an electronic power switch configured to controllably deliver current to a buck-mode boost circuit; and a buck-mode boost controller configured to control the electronic power switch and to turn the electronic power switch off each time an average current through the electronic power switch during an on cycle of the electronic power switch reaches a desired level, the buck-mode boost controller including a current regulator and an integrator, the current regulator being configured to: integrate a difference between a reference signal that is representative of the desired level of the average current through the electronic power switch and a detected signal that is representative of an actual current that is being delivered to the buck-mode boost circuit through the electronic power switch; and preserve that integrated value while the electronic power switch is off, wherein: the reference signal to the integrator does not change during each cycle of the electronic power switch; the current regulator is configured to deactivate the integrator while the electronic power switch is off; or the current regulator is configured to disconnect the detected signal from the integrator while the electronic power switch is off.