US 12,407,267 B2
Switching power supply system with both analog and digital feedback
Wanle Liu, Jiangsu (CN)
Assigned to MIX-DESIGN SEMICONDUCTOR TECHNOLOGIES LTD., Jiangsu (CN)
Filed by MIX-DESIGN SEMICONDUCTOR TECHNOLOGIES LTD., Jiangsu (CN)
Filed on Jan. 8, 2024, as Appl. No. 18/406,391.
Claims priority of application No. 202310338982.4 (CN), filed on Apr. 1, 2023.
Prior Publication US 2024/0333122 A1, Oct. 3, 2024
Int. Cl. H02M 3/335 (2006.01); H02M 1/00 (2006.01); H02M 1/092 (2006.01)
CPC H02M 3/33592 (2013.01) [H02M 1/0003 (2021.05); H02M 1/092 (2013.01); H02M 3/33515 (2013.01); H02M 3/33523 (2013.01); H02M 3/33576 (2013.01); H02M 1/0025 (2021.05)] 9 Claims
OG exemplary drawing
 
6. A switching power supply system with both analog and digital feedback, the switching power supply system is configured to regulate an output current Iout, wherein the switching power supply system comprises: a second analog collecting and regulating module, a second secondary digital feedback signal sampling and driving module, a second isolation transmission module, and a second secondary digital feedback signal decoding and reference generating module;
the second analog collecting and regulating module is configured to collect a peak current on a primary side, determine the output current Iout of the switching power supply system according to the peak current, control an on/off time of a primary switch tube according to the output current Iout, regulate the output current Iout and make a value of the output current Iout approach a preset maximum current Imax value;
the second secondary digital feedback signal sampling and driving module is configured to directly obtain a system output current signal on a secondary side, and generate a secondary digital feedback signal after processing according to the system output current signal and the preset maximum current Imax value, the secondary digital feedback signal is transmitted to the second secondary digital feedback signal decoding and reference generating module through the second isolation transmission module;
the second secondary digital feedback signal decoding and reference generating module is configured to generate a corresponding current reference signal according to the secondary digital feedback signal, and output the corresponding current reference signal to the second analog collecting and regulating module;
the second analog collecting and regulating module is further configured to update a preset reference current according to the corresponding current reference signal to yield an updated reference current, control the on/off time of the primary switch tube according to the updated reference current, and further regulate the output current Iout;
a value of the preset reference current is equal to the preset maximum current Imax value,
the second secondary digital feedback signal sampling and driving module comprises a second current collecting and processing circuit, a second analog-to-digital converter (ADC) circuit, a second digital processing and reference controlling logic circuit, a second digital feedback signal generating circuit, and a second digital feedback signal driving circuit;
the second current collecting and processing circuit is configured to directly obtain the system output current signal on the secondary side, and output the system output current signal to the second ADC circuit;
the second ADC circuit is configured to convert the system output current signal into a corresponding digital signal, and output the corresponding digital signal to the second digital processing and reference controlling logic circuit;
the second digital processing and reference controlling logic circuit is configured to obtain the system output current signal according to the corresponding digital signal, compare the system output current signal with the preset maximum current Imax value, and obtain a current difference ΔI after processing, and output the current difference ΔI to the second digital feedback signal generating circuit;
the second digital feedback signal generating circuit is configured to generate the secondary digital feedback signal according to the current difference ΔI, and output the secondary digital feedback signal to the second digital feedback signal driving circuit; and
the second digital feedback signal driving circuit is configured to drive the second isolation transmission module according to the secondary digital feedback signal, and transmit the secondary digital feedback signal to the second secondary digital feedback signal decoding and reference generating module.