| 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 |
| 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.
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