US 11,990,841 B2
Multi-mode hybrid control DC-DC converting circuit and control method thereof
Cheng-Chou Wu, Tainan (TW); and Chun-Tse Chen, Tainan (TW)
Assigned to MINMAX TECHNOLOGY CO., LTD., Tainan (TW)
Filed by MINMAX TECHNOLOGY CO., LTD., Tainan (TW)
Filed on Mar. 8, 2022, as Appl. No. 17/689,560.
Prior Publication US 2023/0291317 A1, Sep. 14, 2023
Int. Cl. H02M 3/335 (2006.01); H02M 1/084 (2006.01); H02M 1/34 (2007.01)
CPC H02M 3/33553 (2013.01) [H02M 1/084 (2013.01); H02M 1/34 (2013.01); H02M 3/33523 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A multi-mode hybrid control DC-DC converting circuit comprising:
a switching power converter comprising:
a transformer; and
a switching switch connected to a primary-side winding of the transformer in series and having a control terminal; and
a microcontroller connected to the switching power converter and the control terminal of the switching switch and storing multiple feedback reference values and multiple ratio values; wherein
the microcontroller detects an input voltage of the switching power converter, selects one of the multiple feedback reference values according to a magnitude of the input voltage, multiplies the feedback reference value selected by the microcontroller by the multiple ratio values respectively to set multiple thresholds, and determines whether a feedback voltage of the switching power converter is higher or lower than each one of the thresholds to perform a variable-frequency mode, a constant-frequency mode, or a pulse-skipping mode;
the microcontroller outputs a driving signal to the switching switch and correspondingly adjusts a frequency of the driving signal according to the variable-frequency mode, the constant-frequency mode, or the pulse-skipping mode which is performed.