US 11,870,345 B2
Adaptive on-time generation for three-level power converters
Chongli Cai, San Jose, CA (US); Dingkun Du, Santa Clara, CA (US); and Michael B. Nussbaum, Santa Cruz, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Sep. 22, 2021, as Appl. No. 17/482,287.
Prior Publication US 2023/0096741 A1, Mar. 30, 2023
Int. Cl. H02M 3/158 (2006.01); G06F 1/28 (2006.01); H02M 3/157 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/158 (2013.01) [G06F 1/28 (2013.01); H02M 3/157 (2013.01); H02M 1/0003 (2021.05)] 20 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
a switch circuit including a plurality of devices, a capacitor, and a switch node coupled to a regulated power supply node via an inductor, wherein the switch circuit is configured to:
couple, during a first time period of a first cycle of a particular switching sequence, the capacitor between an input power supply node and the switch node using a first subset of the plurality of devices;
couple, during a second time period of the first cycle of the particular switching sequence, the capacitor between the switch node and a ground supply node using a second subset of the plurality of devices; and
couple, during a third time period of the first cycle of the particular switching sequence, the switch node to the input power supply node using a third subset of the plurality of devices; and
a control circuit configured to adjust a duration of the third time period based on a voltage level of the input power supply node, a voltage level of the regulated power supply node, a value of the inductor, and respective durations of first time period and the second time period.