US 12,424,922 B2
Power supply device, circuit control method, and power supply system
Chen Tian, Guangdong (CN); Jingpeng Zhu, Jiangsu (CN); Jialiang Zhang, Guangdong (CN); and Ming Xu, Jiangsu (CN)
Assigned to GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD., Guangdong (CN); and POWERLAND TECHNOLOGY INC., Jiangsu (CN)
Filed by GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD., Guangdong (CN); and POWERLAND TECHNOLOGY INC., Jiangsu (CN)
Filed on Dec. 29, 2022, as Appl. No. 18/147,907.
Application 18/147,907 is a continuation of application No. PCT/CN2021/108765, filed on Jul. 27, 2021.
Claims priority of application No. 202011066558.1 (CN), filed on Sep. 30, 2020.
Prior Publication US 2023/0170783 A1, Jun. 1, 2023
Int. Cl. H02M 3/335 (2006.01); H02J 7/02 (2016.01); H02M 1/00 (2006.01); H02M 3/00 (2006.01)
CPC H02M 1/0067 (2021.05) [H02J 7/02 (2013.01); H02M 3/33569 (2013.01); H02J 2207/20 (2020.01); H02M 3/01 (2021.05)] 19 Claims
OG exemplary drawing
 
1. A power supply device, comprising:
an input rectifier circuit configured to convert a received alternating-current power into a first pulsating direct-current voltage;
a first-stage conversion circuit connected with the input rectifier circuit, wherein the first-stage conversion circuit is configured to convert the first pulsating direct-current voltage into a second pulsating direct-current voltage;
a valley-fill circuit connected with the first-stage conversion circuit, wherein the valley-fill circuit is configured to supply, in response to a voltage value of the second pulsating direct-current voltage being lower than a voltage threshold, electrical power to thereby enable the voltage value of the second pulsating direct-current voltage to be greater than or equal to the voltage threshold; and
a second-stage conversion circuit connected with the first-stage conversion circuit, wherein the second-stage conversion circuit is configured to convert the second pulsating direct-current voltage into a constant direct-current voltage and output the constant direct-current voltage;
wherein the first-stage conversion circuit comprises a switch circuit and a voltage transformation circuit, and the voltage transformation circuit is configured to convert the first pulsating direct-current voltage that has been performed with chopper processing by the switch circuit of the first-stage conversion circuit into the second pulsating direct-current voltage;
wherein the valley-fill circuit comprises an energy storage circuit and a switch circuit; the energy storage circuit is connected with two terminals of a secondary winding of the voltage transformation circuit and configured to obtain electrical power supplied by the voltage transformation circuit; and the switch circuit of the valley-fill circuit is connected with the energy storage circuit and configured to perform chopper processing on a voltage output by the energy storage circuit;
wherein the power supply device further comprises at least one filter capacitor, the at least one filter capacitor is connected with an output terminal of the first-stage conversion circuit and an input terminal of the second-stage conversion circuit; and
wherein the valley-fill circuit further comprises a first diode, a second diode and an inductor; the first diode is connected between a terminal of the secondary winding and an input terminal of the energy storage circuit and configured to perform half-wave rectification on a voltage signal input by the secondary winding to obtain a rectified voltage and charge the energy storage circuit with the rectified voltage; the second diode is a freewheeling diode for providing a freewheeling loop for the inductor; and the inductor is connected between the switch circuit of the valley-fill circuit and an output terminal of the first-stage conversion circuit and configured to form a first filter circuit with the at least one filter capacitor, and the first filter circuit is configured to filter the voltage performed with the chopper processing.