US 12,328,123 B2
Switching frequency controller, voltage converter, and method for controlling switching frequency
Bu-Wei Chen, Zhubei (TW)
Assigned to ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP, Toronto (CA)
Filed by ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP, Toronto (CA)
Filed on Jun. 27, 2023, as Appl. No. 18/214,693.
Prior Publication US 2025/0007500 A1, Jan. 2, 2025
Int. Cl. H03K 5/00 (2006.01); H03K 21/10 (2006.01); H03L 7/193 (2006.01)
CPC H03K 5/00006 (2013.01) [H03K 21/10 (2013.01); H03L 7/193 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A switching frequency controller comprising:
a frequency divider, configured to generate a divisional signal having a divisional frequency according to a target signal having a target frequency, wherein the target frequency is 2N times of the divisional frequency, and wherein N is a positive integer;
a frequency detector coupled to the frequency divider, the frequency detector being configured to
receive
the divisional signal generated by the frequency divider, and
a switching control signal generated by a control signal generator, and
calculate a number of periods of the switching control signal that pass by during each cycle of the divisional signal,
wherein each cycle of the divisional signal comprises an on-time and an off-time having different potentials, and
wherein the number of periods is represented by (N+1) bits;
an accumulation counter coupled to the frequency detector, the accumulation counter being configured to
set an indication value as a starting value during an initial stage, and
increase or decrease the indication value by a predetermined amount according to a most significant bit of the number of periods; and
an on-time controller coupled to the accumulation counter, the on-time controller being configured to adjust a parameter of the control signal generator according to the indication value so as to adjust an on-time length of the switching control signal;
wherein a frequency of the switching control signal is effectively controlled within a preset range close to the target frequency.