US 12,301,280 B2
Spread spectrum switching converter and spread spectrum control method thereof
Jung-Sheng Chen, Miaoli (TW); Chin-Yen Lin, Hsinchu (TW); Ching-Yu Chen, Hsinchu (TW); Ting-Jung Lo, Hsinchu (TW); and Hsing-Shen Huang, Hsinchu (TW)
Assigned to RICHTEK TECHNOLOGY CORPORATION, Zhubei (TW)
Filed by Richtek Technology Corporation, Zhubei (TW)
Filed on Oct. 28, 2022, as Appl. No. 18/050,784.
Claims priority of provisional application 63/299,129, filed on Jan. 13, 2022.
Claims priority of application No. 111127839 (TW), filed on Jul. 25, 2022.
Prior Publication US 2023/0223987 A1, Jul. 13, 2023
Int. Cl. H02M 1/44 (2007.01); H02M 1/00 (2006.01); H04B 1/717 (2011.01)
CPC H04B 1/7172 (2013.01) [H02M 1/0009 (2021.05); H02M 1/0025 (2021.05); H02M 1/44 (2013.01); H04B 1/7174 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A spread spectrum switching converter, which is configured to operably switch at least one switch thereof according to a control signal, so as to convert an input power to an output power; the spread spectrum switching converter comprising:
a pulse width modulation (PWM) circuit, which is configured to operably generate an initial PWM signal according to a feedback signal related to the output power by performing pulse width modulation; and
a pulse omission control circuit, which is configured to operably generate a pulse omission control signal, wherein pulses of the initial PWM signal are masked during a pulse width of the pulse omission control signal, thus generating an adjusted PWM signal to thereby generate the control signal, wherein the pulse width of the pulse omission control signal is adjusted to vary randomly based on a random control signal, so as to randomly vary a range of the pulses being masked in the initial PWM signal, such that the adjusted PWM signal exhibits a spread spectrum characteristic.