US 9,812,963 B1
Current detection and averaging circuit for switching power supplies with a half-bridge switch circuit topology
James Nguyen, San Jose, CA (US); and Francis Yu, Sunnyvale, CA (US)
Assigned to Monolithic Power Systems, Inc., San Jose, CA (US)
Filed by Monolithic Power Systems, Inc., San Jose, CA (US)
Filed on May 20, 2016, as Appl. No. 15/161,013.
Int. Cl. H02M 3/158 (2006.01)
CPC H02M 3/158 (2013.01) 13 Claims
OG exemplary drawing
 
1. An electrical circuit comprising:
a half-bridge circuit comprising a high side switch and a low side switch;
an output inductor that is connected to a switch node that is connected to a terminal of the high side switch and a terminal of the low side switch; and
a current detection circuit that samples and holds in a first capacitor a peak of an inductor current flowing through the output inductor during an ON time of the low side switch, samples and holds in a second capacitor a valley of the inductor current during the ON time of the low side switch, and generates a sense inductor current that is representative of the inductor current by combining charges stored in the first and second capacitors during a turn OFF time of the low side switch.