US 11,658,579 B2
Resonant control device and resonant control method thereof
Hsin-Hung Lu, New Taipei (TW); and Po Han Huang, New Taipei (TW)
Assigned to Mean Well (Guangzhou) Electronics Co., Ltd., Guangzhou (CN); and Mean Well Enterprises Co., Ltd., New Taipei (TW)
Filed on Jun. 1, 2021, as Appl. No. 17/335,721.
Claims priority of application No. 202110261602.2 (CN), filed on Mar. 10, 2021.
Prior Publication US 2022/0294354 A1, Sep. 15, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H02M 3/335 (2006.01)
CPC H02M 3/33523 (2013.01) 16 Claims
OG exemplary drawing
1. A resonant control device comprising:
a feedback controller coupled to an output terminal of a resonant converter, the output terminal is coupled to a load, and an output voltage is applied across the load, wherein the feedback controller is configured to receive a reference voltage and the output voltage and use the reference voltage to perform voltage compensation on the output voltage to generate a control parameter; and
a processor, coupled to the feedback controller and the resonant converter, presetting a switching parameter, wherein the processor is configured to receive the control parameter, generate pulse modulation signals according to the control parameter and the switching parameter, and use the pulse modulation signals to drive the resonant converter to regulate the output voltage, the pulse modulation signal has a maximum frequency and a minimum frequency, the maximum frequency corresponds to the switching parameter, the pulse modulation signals are pulse frequency modulation signals when the control parameter is larger than or equal to the switching parameter, and the pulse modulation signals control the resonant converter to operate for a fixed period within each cycle of the pulse modulation signal when the control parameter is less than the switching parameter;
wherein the output voltage is applied to the load to generate an output current, the output voltage and the output current form an output power, and a frequency of the pulse modulation signal is directly linearly proportional to the output power when the control parameter is less than the switching parameter.