Patent ID: 6972921
Filing Date: 2005-12-06
Classification: G11B,H02M

Abstract:
1. A circuit for protecting a capacitor that is charged to a maximum charging voltage level comprising: a voltage pump, in communication with the capacitor, adapted to selectively charge the capacitor with a predetermined level of charging voltage so as to maintain the maximum charging voltage level in the capacitor; a current source, in communication with the capacitor, adapted to selectively charge the capacitor with a predetermined level of current; and an overall controller that measures a level of charging voltage in the capacitor and that selectively activates the current source while deactivating the voltage pump when the capacitor's level of charging voltage is less than a threshold charging voltage level and that selectively deactivates the current source while activating the voltage pump when the capacitor's level of charging voltage is greater than or equal to the threshold charging voltage level.